US20110241443A1 - Load condition controlled power strip - Google Patents
Load condition controlled power strip Download PDFInfo
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- US20110241443A1 US20110241443A1 US13/161,753 US201113161753A US2011241443A1 US 20110241443 A1 US20110241443 A1 US 20110241443A1 US 201113161753 A US201113161753 A US 201113161753A US 2011241443 A1 US2011241443 A1 US 2011241443A1
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- power
- outlet
- power strip
- outlets
- strip
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Definitions
- the present invention relates to reducing power consumption in electronic devices. More particularly, the present invention relates to a circuit and method for disengaging an outlet in a power strip from a power input when idle load conditions are present.
- Power strips are used to multiply the number of AC outlets available from a single AC socket.
- a computer, monitor, printer, scanner, and other electronic devices are often connected to the same power strip. When not in use, these connected devices will often be left on and go into self-imposed idle modes that typically consume less than 1 watt per device. Even though each is consuming standby power, the total power delivered by the power strip can be as much as the number of outlets used times the idle power, perhaps as great as 6 watts or more. This multiplicity of wasted idle power can be reduced or eliminated if the power strip can learn or be programmed to sense the idle condition of each outlet and turn that outlet off if idle conditions are present.
- a method and circuit for reducing power consumption of a power strip during idle conditions is provided.
- a power strip is configured for reducing or eliminating power during idle mode by disengaging at least one outlet from a power input.
- a power strip may include one or more outlets and one or more outlet circuits, with AC power input connected to the outlets through the outlet circuit(s).
- the outlet circuit may include a current transformer, a control circuit, and a switch.
- the secondary winding of the current transformer provides an output power level signal that is proportional to the load at the outlet.
- the switch facilitates disengaging of the primary circuit of the current transformer from such outlet.
- FIG. 1A illustrates a block diagram of an exemplary load condition controlled power strip
- FIG. 1B illustrates another block diagram of an exemplary load condition controlled power strip in accordance with an exemplary embodiment
- FIG. 2 illustrates a block diagram of an exemplary load condition controlled power strip in accordance with an exemplary embodiment
- FIG. 3 illustrates a circuit diagram of an exemplary control circuit for use within an exemplary load condition controlled power strip in accordance with an exemplary embodiment
- FIG. 4 illustrates a block diagram of an exemplary load condition controlled power strip in accordance with an exemplary embodiment
- FIG. 5 illustrates a schematic diagram of an exemplary control circuit for use within an exemplary load condition controlled power strip in accordance with an exemplary embodiment.
- the present invention may be described herein in terms of various functional components and various processing steps. It should be appreciated that such functional components may be realized by any number of hardware or structural components configured to perform the specified functions.
- the present invention may employ various integrated components, such as buffers, current mirrors, and logic devices comprised of various electrical devices, e.g., resistors, transistors, capacitors, diodes and the like, whose values may be suitably configured for various intended purposes.
- the present invention may be practiced in any integrated circuit application.
- exemplary embodiments of the present invention will be described herein in connection with a sensing and control system and method for use with power strip circuits.
- connections and couplings can be realized by direct connection between components, or by connection through other components and devices located thereinbetween.
- a power strip configured for reducing or eliminating power during idle mode by disengaging power input from at least one outlet.
- a power strip 100 comprises two or more outlets 120 and two or more outlet circuits 130 .
- power strip 100 comprises a single outlet 120 and a single outlet circuit 130 .
- power strip 100 comprises at least one outlet 120 coupled with outlet circuit 130 and at least one outlet 120 directly connected to an AC line input 110 .
- power strip 100 comprises AC line input 110 connected to outlet circuit 130 , which in turn is connected to outlet 120 .
- the outlet circuit 130 comprises a current measuring system 231 , a control circuit 232 , and a switch 233 .
- current measuring system 231 comprises a current transformer 231 having a primary circuit and a secondary winding for illustration purposes.
- current measuring system 231 may also comprise a resistor with a differential amplifier, a current sensing chip, a Hall-effect device, or any other suitable component configured to measure current as now known or hereinafter devised.
- Current transformer 231 provides an output power level signal that is proportional to the load at outlet 120 .
- switch 233 connects the primary circuit of current transformer 231 to outlet 120 .
- AC line input 110 is a standard 3 wire grounded plug and cord set that connects to the body of power strip 100 .
- AC line input 110 can be suitably configured in any AC power input configuration or replaced with any other input power configuration.
- the AC line input 110 is connected in parallel to a number of similar outlet circuits 130 that lie between the AC line input 110 and outlets 1-N 120 .
- AC line input 110 may be connected to a 110 volt or 220 volt power source in an exemplary embodiment.
- control circuit 232 may comprise at least one of, or a combination of: a latching circuit, a state machine, and a microprocessor. In one embodiment, control circuit 232 monitors the condition of the secondary winding of current transformer 231 and controls the operation of switch 233 . Furthermore, in an exemplary embodiment, control circuit 232 receives a low frequency or DC signal from current transformer 231 .
- the low frequency signal for example, may be 60 Hz. This low frequency or DC signal is interpreted by control circuit 232 as the current required by the load at outlet 120 .
- Control circuit 232 can comprise various structures for monitoring the condition of the secondary winding of current transformer 231 and controlling the operation of switch 233 .
- control circuit 232 includes a current sensor 301 and a logic control unit 302 .
- Current sensor 301 monitors the output of a current measuring system, such as for example, the secondary winding of current transformer 231 , which is an AC voltage proportional to the load current.
- current sensor 301 provides a signal to logic control unit 302 .
- the signal may be a DC voltage proportional to the current through current sensor 301 .
- the signal may be a current proportional to the current through current sensor 301 .
- outlet circuit 130 of the power strip comprises a logic control unit 302 that is in communication with, and controls, more than one current transformer 231 and more than one switch 233 .
- logic control unit 302 is powered by an energy storage capacitor.
- Logic control unit 302 may briefly connect the storage capacitor to AC line input 110 in order to continue powering logic control unit 302 .
- logic control unit 302 may be powered by a battery or other energy source. This energy source is also referred to as housekeeping or hotel power; it functions as a low auxiliary power source.
- auxiliary power is taken from AC line input 110 .
- logic control unit 302 is a microprocessor capable of being programmed prior to, and after integration of power strip 100 in an electronic device.
- a user is able to connect to logic control unit 302 and customize the parameters of power strip 100 .
- a user may set the threshold level and a sleep mode duty cycle of power strip 100 .
- Data from power strip 100 could be transmitted regarding, for example, the historical power consumption and/or energy saved.
- the bidirectional data transfer between power strip 100 and a display device may be achieved through a wireless signal, such as for example, an infra-red signal, a radio frequency signal, or other similar signal.
- the data transfer may also be achieved using a wired connection, such as for example, a USB connection or other similar connection.
- control circuit 232 may further comprise a power disconnect 303 in communication with logic control unit 302 .
- Power disconnect 303 is configured to isolate logic control unit 302 from AC line input 110 and reduce power loss. While isolated, logic control unit 302 is powered by the storage capacitor or other energy source and logic control unit 302 enters a “sleep” mode. If the storage capacitor reaches a low power level, power disconnect 303 is configured to reconnect logic control unit 302 to AC line input 100 to recharge the storage capacitor.
- power disconnect 303 is able to reduce the power loss from a range of microamperes of leakage to a range of nanoamperes of leakage.
- control circuit 232 receives a control signal that is impressed upon AC line input 110 by another controller.
- the control signal may be, for example, the X10 control protocol or other similar protocol.
- Control circuit 232 may receive the control signal through the secondary winding of current transformer 231 , from a coupled AC line input 110 , or any other suitable means configured to couple AC line input 110 to control circuit 232 as now known or hereinafter devised.
- This control signal may come from within power strip 100 or may come from an external controller.
- the control signal may be a high frequency control signal or at least a control signal at a frequency different than the frequency of AC line input 110 .
- control circuit 232 interprets the control signal to engage or disengage switch 233 .
- an external controller may transmit a signal to turn power strip 100 to an “on” or “off” condition.
- switch 233 facilitates or controls disengaging of the primary circuit of current transformer 231 from outlet 120 , i.e., switch 233 facilitates the disengaging of a power source from outlet 120 .
- the secondary winding of current transformer 231 is monitored for an AC waveform at the AC line frequency, where the AC waveform has an RMS voltage proportional to the load current passing through the primary circuit of current transformer 231 to outlet 120 .
- the AC waveform is rectified and filtered to generate a DC signal before being received by control circuit 232 . The DC signal is proportional to the load current passing through the primary circuit of current transformer 231 to outlet 120 .
- switch 233 is configured to control the connection of the primary circuit of current transformer 231 to outlet 120 and comprises a switching mechanism to substantially disengage the primary circuit of current transformer 231 from outlet 120 .
- Switch 233 may comprise at least one of a relay, latching relay, a TRIAC, and an optically isolated TRIAC.
- substantially disabling outlet 120 is intended to convey that the output signal of the secondary winding of current transformer 231 has been interpreted by control circuit 232 as sufficiently low so that it is appropriate to disengage switch 233 and remove power from outlet 120 .
- outlet circuit 130 further comprises a reconnection device 234 , which is configured to enable the closure of switch 233 through logic control unit 302 .
- the closure of switch 233 reconnects outlet 120 to the primary circuit of current transformer 231 and AC line input 110 .
- reconnection device 234 comprises a switch device that may be closed and opened in various manners.
- reconnection device 234 can comprise a push button that may be manually operated.
- the push button is located near outlet 120 on power strip 100 , for example, on the same surface of power strip 100 as outlet 120 or on an adjacent side of power strip 100 to outlet 120 .
- reconnection device 234 is located remote to power strip 100 to allow a user to re-enable power to an outlet of power strip 100 without having direct contact with power strip 100 .
- reconnection device 234 is affected remotely by signals traveling through AC line input 110 that control circuit 232 interprets as on/off control.
- reconnection device 234 is controlled by a wireless signal, such as for example, an infra-red signal, a radio frequency signal, or other similar signal.
- switch 233 is automatically operated on a periodic basis. For example, switch 233 may automatically reconnect after a few or several minutes or tens of minutes, or any period more or less frequent. In one embodiment, switch 233 is automatically reconnected frequently enough that a battery operated device connected to power strip 100 will not completely discharge internal batteries during a period of no power at the input to the connected device.
- outlet circuit 130 tests for, or otherwise assesses, load conditions. If the load condition on outlet 120 is increased above previously measured levels, outlet 120 will remain connected to the primary circuit of current transformer 231 until the load condition has returned to a selected or predetermined threshold level indicative of a “low load”.
- the determination of load conditions at re-connect are made after a selected time period had elapsed, for example after a number of seconds or minutes, so that current inrush or initialization events are ignored.
- the load conditions may be averaged over a selected time period of a few seconds or minutes so that short bursts of high load average out.
- power strip 100 comprises a master reconnection device that can re-engage all outlets 120 to AC line input 110 .
- power strip 100 has switch 233 closed upon initial power-up, such that power flows to outlet 120 .
- control circuit 232 opens switch 233 to create an open circuit and disengage outlet 120 from the AC power signal. This disengaging effectively eliminates any idle power lost by outlet 120 .
- the threshold level is a predetermined level, for example approximately one watt of power or less flowing to outlet 120 .
- different outlets 120 may have different fixed threshold levels such that devices having a higher power level in idle may be usefully connected to power strip 100 for power management. For example, a large device may still draw about 5 watts during idle, but would never be disconnected from AC line input 110 if the connected 120 had a threshold level of about 1 watt. In various embodiments, certain outlets 120 may have a higher threshold levels to accommodate high power devices, or lower threshold levels for lower power devices.
- the threshold level is a learned level.
- the learned level may be established through long term monitoring by control circuit 232 of load conditions at outlet 120 .
- a history of power levels is created over time by monitoring and may serve as a template of power demand.
- control circuit 232 examines the history of power levels and decides whether long periods of low power demand were times when a device connected at outlet 120 was in a low, or lowest, power mode.
- control circuit 232 disengages outlet 120 during low power usage times when the period of low power matches the template. For example, the template might demonstrate that the device draws power through outlet 120 for eight hours, followed by 16 hours of low power demand.
- control circuit 232 determines the approximate low power level of the electronic device connected at outlet 120 , and sets a threshold level to be a percentage of the determined approximate low power level. For example, control circuit 232 may set the threshold level to be about 100-105% of the approximate low power level demand. In another embodiment, the threshold demand may be set at about 100-110% or 110-120% or more of the approximate low power level demand. In addition, the low power level percentage range may be any variation or combination of the disclosed ranges.
- outlet circuit 130 comprises current transformer 231 , current sensor 301 , logic control unit 302 , power disconnect 303 , reconnection device 234 , and switch 233 .
- current transformer 231 and current sensor 301 combine to measure the current in AC line input and convert said current to a proportional DC voltage that can be read by logic control unit 302 .
- switch 233 may comprise a latching relay that provides a hard connect/disconnect of AC line input 110 to outlet 120 after a command from logic control unit 302 . Switch 233 alternates between open and closed contacts. Furthermore, switch 233 holds its position until reset by logic control unit 302 , and will hold position without consuming any power in the relay coil K 1 .
- logic control unit 302 comprises a microcontroller that receives input of the current in the AC line, controls the state of switch 233 and reads or otherwise assesses the state or position of the contacts of reconnection device 234 and switch 233 .
- logic control unit 302 learns and stores the power profile for an electronic device connected to outlet 120 .
- outlet circuit 130 further comprises reconnection device 234 , which is activated to turn on outlet 120 when outlet circuit 130 is first connected to AC line input 110 or when full power is needed immediately at outlet 120 .
- power disconnect 303 comprises a network of transistors Q 1 , Q 2 , Q 3 which are used to condition AC line input 110 to a safe level suitable for logic control unit 302 and isolate logic control unit 302 from AC line input 110 .
- power disconnect 303 comprises relays in addition to, or in place of, the transistors of the prior embodiment.
- Initial plug-in of power strip 500 involves connecting power strip 500 to an AC power source.
- all circuits of outlet circuit 130 are dead and switch 233 is in the last position set by logic control unit 302 .
- This initial condition may or may not provide power to outlet 120 .
- power disconnect 303 comprises transistors Q 1 , Q 2 , Q 3 and capacitor C 3 .
- current transformer 231 provides dielectric isolation from primary side to secondary side so that only small leakage current flows due to the inter-winding capacitance of current transformer 231 .
- a user may reconnect the circuit using reconnection device 234 to establish a current path through diode D 1 , zener diode Z 1 , resistor R 4 , reconnection device 234 and zener diode Z 3 .
- Diode D 1 serves to half-wave rectify the AC line to drop the peak to peak voltage in half.
- Zener diode Z 1 further reduces the voltage from diode D 1 , for example to about 20 volts.
- Zener diode Z 3 and resistor R 4 form a current limited zener regulator that provides an appropriate DC voltage at the VDD input to logic control unit 302 while reconnection device 234 is held.
- capacitor C 2 smoothes the DC signal on zener diode Z 3 and provides storage during the contact bounce of reconnection device 234 .
- Capacitor C 2 is sized to provide sufficient storage during the start-up time of logic control unit 302 , and capacitor C 2 in combination with resistor R 4 provides a fast rising edge on the VDD input to properly reset logic control unit 302 .
- diode D 5 isolates capacitor C 2 from capacitor CS so the rise time constant of capacitor C 2 and resistor R 4 is not affected by the large capacitance of capacitor CS.
- logic control unit 302 is configured to initialize and immediately set up to provide its own power before reconnection device 234 is released. This is accomplished from voltage doubler outputs VD 1 -VD 3 and ZG 1 of logic control unit 302 . First, output ZG 1 is driven high to turn on transistor Q 2 . With transistor Q 2 on, a current path is established through resistor R 3 and zener diode Z 2 providing a regulated voltage at the drain of transistor Q 1 . This regulated voltage is similar to that produced by zener diode Z 3 and is appropriate for the VDD input of logic control unit 302 .
- logic control unit 302 outputs VD 1 -VD 3 begin switching to produce a gate drive signal to turn on transistor Q 1 .
- the signals produced by outputs VD 1 -VD 3 and components including capacitor C 3 , transistor Q 3 , capacitor C 4 , diode D 3 and diode D 4 produce a voltage at the gate of transistor Q 1 that is about twice the voltage on input VDD of logic control unit 302 . This voltage doubling turns transistor Q 1 on hard. Once transistor Q 1 is on, the voltage at zener diode Z 2 charges capacitor CS.
- capacitor CS is a large storage capacitor that is used to power logic control unit 302 when reconnection device 234 is not being activated. After capacitor CS has been charged for a few milliseconds, outputs VD 1 -VD 3 and ZG 1 return to a rest state and transistors Q 1 and Q 2 are turned off. In this embodiment, logic control unit 302 is operating off the stored charge in capacitor CS and not drawing power from AC line input 110 . When reconnection device 234 is no longer active, capacitor CS will continue to power logic control unit 302 .
- logic control unit 302 may be able to disengage from drawing power and enter a “sleep” mode.
- a timing function is enabled in logic control unit 302 that uses capacitor C 5 to perform the timing function.
- Capacitor C 5 is briefly charged by the CAPTIME output of logic control unit 302 and over time capacitor C 5 discharge rate will mimic the decay of the voltage on capacitor CS.
- logic control unit 302 will set the state of outputs VD 1 -VD 3 and ZG 1 to again recharge capacitor CS from the AC line. This process repeats over and over so power is never lost to logic control unit 302 .
- the recharge process takes only milliseconds to operate, depending on the size of capacitor CS.
- logic control unit 302 when logic control unit 302 is not busy recharging capacitor CS, switching relay K 1 , or measuring power drawn from outlet 120 , logic control unit 302 is operating in a deep sleep mode that stops all, or substantially all, internal activity and waits for capacitor C 5 to discharge. This sleep mode consumes very little power and allows the charge on storage capacitor CS to persist for many seconds. If reconnection device 234 is activated during the sleep mode, logic control unit 302 will resume normal operation and set or reset relay K 1 . Alternatively, if capacitor C 5 voltage falls too low, logic control unit 302 will again recharge capacitor CS and then return to sleep mode.
- power strip 100 may continue to monitor for changes in the power drawn by the electronic device.
- logic control unit 302 while logic control unit 302 continuously goes in and out of sleep mode to re-power itself, logic control unit 302 will also periodically test the power being drawn from outlet 120 .
- the period of power testing is much greater than that of capacitor CS charging and, for example, may be only tested every ten or more minutes.
- relay K 1 For the outcome when the device is operating and the switch is not in a standby condition, relay K 1 has been previously set to deliver power to outlet 120 and power testing shows an appreciable load current is being drawn by the electronic device connected.
- An “appreciable load” may be defined by some fixed value programmed into logic control unit 302 , or it may be the result of a number of power tests and be the typical load current for this electronic device.
- a power test result here will be interpreted as normal conditions and logic control unit 302 will go back into sleep mode cycling until another time period, such as ten minutes, has passed when the power test will be made again.
- the duration of the sleep mode cycling is determined by a user. For example, a user may set the sleep mode duration to be one, two, or five minutes and may do so using a dial, a digital input, a push button, keypad or any other suitable means now know or hereinafter devised.
- relay K 1 For the outcome when the device is not operating but the switch is not in a standby condition, relay K 1 has been previously set to deliver power to outlet 120 and power testing shows a negligible load current being drawn by the device connected.
- the “negligible load” may be some fixed value programmed into logic control unit 302 , or it may be the result of a number of power tests and be the typical minimum found for this electronic device. In either case the action taken by logic control unit 302 will be to set relay K 1 to an open condition by using logic control unit 302 outputs RELAY 1 -RELAY 3 to energize relay coil K 1 .
- the state of relay K 1 is determined by logic control unit 302 testing for the presence of resistor R 5 , since logic control unit 302 may not know the previous state of relay K 1 , for example, starting from power off state.
- logic control unit 302 For the outcome when the switch is in a standby condition, that is, relay K 1 has been set to remove power from outlet 120 , logic control unit 302 must set relay K 1 to a closed condition to allow AC power to be applied to the outlet. In an exemplary method, once relay K 1 is set, a period of time is allowed to elapse before the power testing is done. This delay allows for the electronic device attached to outlet 120 to initialize and enter a stable operating mode. Power measurements may now be made over some period of time to determine if the electronic device is in a low or high power state. If a high power state is determined, relay K 1 remains set. If a low power state is determined, relay K 1 is reset to open condition and power is again removed from outlet 120 . Also, logic control unit 302 will again begin sleep mode cycling and power testing after a determined time period, for example, every ten minutes.
- activating reconnection device 234 will immediately wake logic control unit 302 from sleep mode. Since the wake up was from the activation of reconnection device 234 and not due to power testing or capacitor CS recharging, logic control unit 302 will immediately set relay K 1 to closed position to power the electronic device connected to outlet 120 .
- power strip 100 further comprises a “Green Mode” switch that enables or disables the “green” mode operation.
- the green mode switch may be a hard, manual switch or it may be a signal to logic control unit 302 .
- Green” mode operation is the disengaging of outlet 120 from AC line input 110 when substantially no load is being drawn at outlet 120 .
- a user may use the green mode switch to disenable green mode operation on various outlets when desired. For instance, this added control may be desirable on outlets that power devices with clocks or devices that need to be instantly on, such as a fax machine.
- power strip 100 includes LED indicators, which may indicate whether an outlet is connected to the power line and drawing a load current.
- the LED indicators may indicate whether an outlet is active, that is, power is drawn by an electronic device and/or the outlet has power available even if an electronic device is not connected.
- a pulsing LED may be used to show when power testing is being done or to indicate the “heartbeat” of sleep mode recharging.
- power strip 100 comprises at least one LCD display.
- LCD display may be operated by logic control unit 302 to indicate the load power being provided to outlet 120 , for example during times of operation.
- the LCD may also provide information about the power saved or power consumed by operating power strip 100 in or out of a “green” mode. For example, LCD may display the sum total of watts saved during a certain time period, such as the life of power strip 100 or in a day.
- Various embodiments may also be used to enhance the efficient use of the power strip and/or individual outlets in the power strip.
- One such embodiment is the implementation of a photocell or other optical sensor monitored by logic control unit 302 .
- the photocell determines whether light is present in the location of power strip 100 and logic control unit 302 can use this determination to disengage outlet 120 depending on the ambient light conditions.
- logic control unit 302 may disengage power output 120 during periods of darkness. In other words, the power strip may be turned off at night.
- devices do not need power if located in a dark room, such as an unused conference room in an office.
- the power outputs may be turned off when the ambient light conditions exceed a certain level, which may be predetermined or user determined.
- power strip 100 further comprises an internal clock.
- Logic control unit 302 may use the internal clock to learn which time periods show a high power usage at outlet 120 . This knowledge may be included to determine when an outlet should have power available.
- the internal clock has quartz crystal accuracy. Also, the internal clock does not need to be set to an actual time. Furthermore, the internal clock may be used in combination with the photocell for greater power strip efficiency and/or accuracy.
Abstract
In accordance with various aspects of the present invention, a method and circuit for reducing power consumption of a power strip is provided. In an exemplary embodiment, a power strip is configured for reducing or eliminating power during idle mode by disengaging an outlet from power input. A power strip may include two or more outlets and two or more outlet circuits, with AC power input connected to the outlets through the outlet circuit(s), which may include a current transformer, a control circuit, and a switch. The current transformer secondary winding provides an output power level signal proportional to the outlet load. If behavior of the current transformer secondary winding indicates that the outlet is drawing substantially no power from the AC power input, the switch facilitates disengaging of the current transformer primary from the outlet.
Description
- This application is a continuation of U.S. patent application Ser. No. 12/860,604, now U.S. Pat. No. 7,964,994, filed on Aug. 20, 2010, and entitled “LOAD CONDITION CONTROLLED POWER STRIP,” which application is a continuation of U.S. patent application Ser. No. 12/180,407, now U.S. Pat. No. 7,795,759, filed Jul. 25, 2008, and entitled “LOAD CONDITION CONTROLLED POWER STRIP”, which is a non-provisional of U.S. Provisional Application No. 61/076,527, filed Jun. 6, 2008, and entitled “LOAD CONDITION CONTROLLED POWER STRIP”, all of which are hereby incorporated by reference.
- The present invention relates to reducing power consumption in electronic devices. More particularly, the present invention relates to a circuit and method for disengaging an outlet in a power strip from a power input when idle load conditions are present.
- The increasing demand for lower power consumption and environmentally friendly consumer devices has resulted in interest in power supply circuits with “green” technology. For example, on average, a notebook power adapter continuously “plugged in” spends 67% of its time in idle mode. Even with a power adapter which conforms to the regulatory requirement of dissipating less then 0.5 watts/hour, this extended idle time adds up to 3000 watt hours of wasted energy each year per adapter. When calculating the wasted energy of the numerous idle power adapters, the power lost is considerable.
- Power strips are used to multiply the number of AC outlets available from a single AC socket. In an office or home environment, a computer, monitor, printer, scanner, and other electronic devices are often connected to the same power strip. When not in use, these connected devices will often be left on and go into self-imposed idle modes that typically consume less than 1 watt per device. Even though each is consuming standby power, the total power delivered by the power strip can be as much as the number of outlets used times the idle power, perhaps as great as 6 watts or more. This multiplicity of wasted idle power can be reduced or eliminated if the power strip can learn or be programmed to sense the idle condition of each outlet and turn that outlet off if idle conditions are present.
- In accordance with various aspects of the present invention, a method and circuit for reducing power consumption of a power strip during idle conditions is provided. In an exemplary embodiment, a power strip is configured for reducing or eliminating power during idle mode by disengaging at least one outlet from a power input. A power strip may include one or more outlets and one or more outlet circuits, with AC power input connected to the outlets through the outlet circuit(s). The outlet circuit may include a current transformer, a control circuit, and a switch. The secondary winding of the current transformer provides an output power level signal that is proportional to the load at the outlet. In an exemplary embodiment, if behavior of the secondary winding of the current transformer indicates that at least one outlet is drawing substantially no power from the AC power input, the switch facilitates disengaging of the primary circuit of the current transformer from such outlet.
- A more complete understanding of the present invention may be derived by referring to the detailed description and claims when considered in connection with the Figures, where like reference numbers refer to similar elements throughout the Figures, and:
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FIG. 1A illustrates a block diagram of an exemplary load condition controlled power strip; -
FIG. 1B illustrates another block diagram of an exemplary load condition controlled power strip in accordance with an exemplary embodiment; -
FIG. 2 illustrates a block diagram of an exemplary load condition controlled power strip in accordance with an exemplary embodiment; -
FIG. 3 illustrates a circuit diagram of an exemplary control circuit for use within an exemplary load condition controlled power strip in accordance with an exemplary embodiment; -
FIG. 4 illustrates a block diagram of an exemplary load condition controlled power strip in accordance with an exemplary embodiment; and -
FIG. 5 illustrates a schematic diagram of an exemplary control circuit for use within an exemplary load condition controlled power strip in accordance with an exemplary embodiment. - The present invention may be described herein in terms of various functional components and various processing steps. It should be appreciated that such functional components may be realized by any number of hardware or structural components configured to perform the specified functions. For example, the present invention may employ various integrated components, such as buffers, current mirrors, and logic devices comprised of various electrical devices, e.g., resistors, transistors, capacitors, diodes and the like, whose values may be suitably configured for various intended purposes. In addition, the present invention may be practiced in any integrated circuit application. However for purposes of illustration only, exemplary embodiments of the present invention will be described herein in connection with a sensing and control system and method for use with power strip circuits. Further, it should be noted that while various components may be suitably coupled or connected to other components within exemplary circuits, such connections and couplings can be realized by direct connection between components, or by connection through other components and devices located thereinbetween.
- In accordance with various aspects of the present invention, a power strip configured for reducing or eliminating power during idle mode by disengaging power input from at least one outlet is disclosed. In an exemplary embodiment, and with reference to
FIG. 1A , apower strip 100 comprises two ormore outlets 120 and two ormore outlet circuits 130. In another exemplary embodiment (not shown),power strip 100 comprises asingle outlet 120 and asingle outlet circuit 130. In yet another exemplary embodiment, and with reference toFIG. 1B ,power strip 100 comprises at least oneoutlet 120 coupled withoutlet circuit 130 and at least oneoutlet 120 directly connected to anAC line input 110. - In an exemplary embodiment, and with reference to
FIG. 2 ,power strip 100 comprisesAC line input 110 connected tooutlet circuit 130, which in turn is connected tooutlet 120. Theoutlet circuit 130 comprises acurrent measuring system 231, acontrol circuit 232, and aswitch 233. In an exemplary embodiment,current measuring system 231 comprises acurrent transformer 231 having a primary circuit and a secondary winding for illustration purposes. However,current measuring system 231 may also comprise a resistor with a differential amplifier, a current sensing chip, a Hall-effect device, or any other suitable component configured to measure current as now known or hereinafter devised.Current transformer 231 provides an output power level signal that is proportional to the load atoutlet 120. Furthermore,switch 233 connects the primary circuit ofcurrent transformer 231 tooutlet 120. - Furthermore, in one embodiment,
AC line input 110 is a standard 3 wire grounded plug and cord set that connects to the body ofpower strip 100. However,AC line input 110 can be suitably configured in any AC power input configuration or replaced with any other input power configuration. TheAC line input 110 is connected in parallel to a number ofsimilar outlet circuits 130 that lie between theAC line input 110 andoutlets 1-N 120. Furthermore,AC line input 110 may be connected to a 110 volt or 220 volt power source in an exemplary embodiment. - In an exemplary embodiment,
control circuit 232 may comprise at least one of, or a combination of: a latching circuit, a state machine, and a microprocessor. In one embodiment,control circuit 232 monitors the condition of the secondary winding ofcurrent transformer 231 and controls the operation ofswitch 233. Furthermore, in an exemplary embodiment,control circuit 232 receives a low frequency or DC signal fromcurrent transformer 231. The low frequency signal, for example, may be 60 Hz. This low frequency or DC signal is interpreted bycontrol circuit 232 as the current required by the load atoutlet 120. -
Control circuit 232 can comprise various structures for monitoring the condition of the secondary winding ofcurrent transformer 231 and controlling the operation ofswitch 233. In an exemplary embodiment, with reference toFIG. 3 ,control circuit 232 includes acurrent sensor 301 and alogic control unit 302.Current sensor 301 monitors the output of a current measuring system, such as for example, the secondary winding ofcurrent transformer 231, which is an AC voltage proportional to the load current. Also,current sensor 301 provides a signal tologic control unit 302. In one embodiment, the signal may be a DC voltage proportional to the current throughcurrent sensor 301. In another embodiment, the signal may be a current proportional to the current throughcurrent sensor 301. In another exemplary embodiment, and with momentary reference toFIG. 4 ,outlet circuit 130 of the power strip comprises alogic control unit 302 that is in communication with, and controls, more than onecurrent transformer 231 and more than oneswitch 233. - In an exemplary embodiment,
logic control unit 302 is powered by an energy storage capacitor.Logic control unit 302 may briefly connect the storage capacitor toAC line input 110 in order to continue poweringlogic control unit 302. In another embodiment,logic control unit 302 may be powered by a battery or other energy source. This energy source is also referred to as housekeeping or hotel power; it functions as a low auxiliary power source. In one embodiment, auxiliary power is taken fromAC line input 110. For further detail on similar current monitoring, see U.S. Provisional Application 61/052,939, hereby incorporated by reference. - In an exemplary embodiment,
logic control unit 302 is a microprocessor capable of being programmed prior to, and after integration ofpower strip 100 in an electronic device. In one embodiment, a user is able to connect tologic control unit 302 and customize the parameters ofpower strip 100. For example, a user may set the threshold level and a sleep mode duty cycle ofpower strip 100. Data frompower strip 100 could be transmitted regarding, for example, the historical power consumption and/or energy saved. The bidirectional data transfer betweenpower strip 100 and a display device may be achieved through a wireless signal, such as for example, an infra-red signal, a radio frequency signal, or other similar signal. The data transfer may also be achieved using a wired connection, such as for example, a USB connection or other similar connection. - In accordance with an exemplary embodiment,
control circuit 232 may further comprise apower disconnect 303 in communication withlogic control unit 302.Power disconnect 303 is configured to isolatelogic control unit 302 fromAC line input 110 and reduce power loss. While isolated,logic control unit 302 is powered by the storage capacitor or other energy source andlogic control unit 302 enters a “sleep” mode. If the storage capacitor reaches a low power level,power disconnect 303 is configured to reconnectlogic control unit 302 toAC line input 100 to recharge the storage capacitor. In an exemplary embodiment,power disconnect 303 is able to reduce the power loss from a range of microamperes of leakage to a range of nanoamperes of leakage. - In another exemplary embodiment,
control circuit 232 receives a control signal that is impressed uponAC line input 110 by another controller. The control signal may be, for example, the X10 control protocol or other similar protocol.Control circuit 232 may receive the control signal through the secondary winding ofcurrent transformer 231, from a coupledAC line input 110, or any other suitable means configured to coupleAC line input 110 to controlcircuit 232 as now known or hereinafter devised. This control signal may come from withinpower strip 100 or may come from an external controller. The control signal may be a high frequency control signal or at least a control signal at a frequency different than the frequency ofAC line input 110. In an exemplary embodiment,control circuit 232 interprets the control signal to engage or disengageswitch 233. In another embodiment, an external controller may transmit a signal to turnpower strip 100 to an “on” or “off” condition. - In an exemplary embodiment, if behavior of the secondary winding of
current transformer 231 indicates thatoutlet 120 is drawing substantially no power fromAC line input 110,switch 233 facilitates or controls disengaging of the primary circuit ofcurrent transformer 231 fromoutlet 120, i.e.,switch 233 facilitates the disengaging of a power source fromoutlet 120. In an exemplary embodiment, the secondary winding ofcurrent transformer 231 is monitored for an AC waveform at the AC line frequency, where the AC waveform has an RMS voltage proportional to the load current passing through the primary circuit ofcurrent transformer 231 tooutlet 120. In another embodiment, the AC waveform is rectified and filtered to generate a DC signal before being received bycontrol circuit 232. The DC signal is proportional to the load current passing through the primary circuit ofcurrent transformer 231 tooutlet 120. - In one embodiment, the phrase “substantially no power” is intended to convey that the output power is in the range of approximately 0-1% of a typical maximum output load. In an exemplary embodiment,
switch 233 is configured to control the connection of the primary circuit ofcurrent transformer 231 tooutlet 120 and comprises a switching mechanism to substantially disengage the primary circuit ofcurrent transformer 231 fromoutlet 120.Switch 233 may comprise at least one of a relay, latching relay, a TRIAC, and an optically isolated TRIAC. - By substantially disabling the primary circuit of
current transformer 231, the power consumption atoutlet 120 is reduced. In one embodiment, substantially disablingoutlet 120 is intended to convey that the output signal of the secondary winding ofcurrent transformer 231 has been interpreted bycontrol circuit 232 as sufficiently low so that it is appropriate to disengageswitch 233 and remove power fromoutlet 120. - In another exemplary embodiment,
outlet circuit 130 further comprises areconnection device 234, which is configured to enable the closure ofswitch 233 throughlogic control unit 302. The closure ofswitch 233 reconnectsoutlet 120 to the primary circuit ofcurrent transformer 231 andAC line input 110. In an exemplary embodiment,reconnection device 234 comprises a switch device that may be closed and opened in various manners. For example,reconnection device 234 can comprise a push button that may be manually operated. In one embodiment, the push button is located nearoutlet 120 onpower strip 100, for example, on the same surface ofpower strip 100 asoutlet 120 or on an adjacent side ofpower strip 100 tooutlet 120. In another exemplary embodiment,reconnection device 234 is located remote topower strip 100 to allow a user to re-enable power to an outlet ofpower strip 100 without having direct contact withpower strip 100. In another embodiment,reconnection device 234 is affected remotely by signals traveling throughAC line input 110 that controlcircuit 232 interprets as on/off control. In yet another embodiment,reconnection device 234 is controlled by a wireless signal, such as for example, an infra-red signal, a radio frequency signal, or other similar signal. - In accordance with another exemplary embodiment,
switch 233 is automatically operated on a periodic basis. For example, switch 233 may automatically reconnect after a few or several minutes or tens of minutes, or any period more or less frequent. In one embodiment,switch 233 is automatically reconnected frequently enough that a battery operated device connected topower strip 100 will not completely discharge internal batteries during a period of no power at the input to the connected device. Afteroutlet 120 is reconnected, in an exemplary embodiment,outlet circuit 130 tests for, or otherwise assesses, load conditions. If the load condition onoutlet 120 is increased above previously measured levels,outlet 120 will remain connected to the primary circuit ofcurrent transformer 231 until the load condition has returned to a selected or predetermined threshold level indicative of a “low load”. In an exemplary embodiment, the determination of load conditions at re-connect are made after a selected time period had elapsed, for example after a number of seconds or minutes, so that current inrush or initialization events are ignored. In another embodiment, the load conditions may be averaged over a selected time period of a few seconds or minutes so that short bursts of high load average out. In yet another exemplary embodiment,power strip 100 comprises a master reconnection device that can re-engage alloutlets 120 toAC line input 110. - In an exemplary method of operation,
power strip 100 hasswitch 233 closed upon initial power-up, such that power flows tooutlet 120. When load conditions atoutlet 120 are below a threshold level,control circuit 232 opensswitch 233 to create an open circuit and disengageoutlet 120 from the AC power signal. This disengaging effectively eliminates any idle power lost byoutlet 120. In one embodiment, the threshold level is a predetermined level, for example approximately one watt of power or less flowing tooutlet 120. - In an exemplary embodiment,
different outlets 120 may have different fixed threshold levels such that devices having a higher power level in idle may be usefully connected topower strip 100 for power management. For example, a large device may still draw about 5 watts during idle, but would never be disconnected fromAC line input 110 if the connected 120 had a threshold level of about 1 watt. In various embodiments,certain outlets 120 may have a higher threshold levels to accommodate high power devices, or lower threshold levels for lower power devices. - In another embodiment, the threshold level is a learned level. The learned level may be established through long term monitoring by
control circuit 232 of load conditions atoutlet 120. A history of power levels is created over time by monitoring and may serve as a template of power demand. In an exemplary embodiment,control circuit 232 examines the history of power levels and decides whether long periods of low power demand were times when a device connected atoutlet 120 was in a low, or lowest, power mode. In an exemplary embodiment,control circuit 232disengages outlet 120 during low power usage times when the period of low power matches the template. For example, the template might demonstrate that the device draws power throughoutlet 120 for eight hours, followed by 16 hours of low power demand. - In another exemplary embodiment,
control circuit 232 determines the approximate low power level of the electronic device connected atoutlet 120, and sets a threshold level to be a percentage of the determined approximate low power level. For example,control circuit 232 may set the threshold level to be about 100-105% of the approximate low power level demand. In another embodiment, the threshold demand may be set at about 100-110% or 110-120% or more of the approximate low power level demand. In addition, the low power level percentage range may be any variation or combination of the disclosed ranges. - Having disclosed various functions and structures for an exemplary power strip configured for reducing or eliminating power during idle mode by disengaging power input, a detailed schematic diagram of an exemplary
power strip circuit 500 can be provided in accordance with an exemplary embodiment of the present invention. With reference toFIG. 5 , in an exemplary embodiment ofpower strip 500,outlet circuit 130 comprisescurrent transformer 231,current sensor 301,logic control unit 302,power disconnect 303,reconnection device 234, andswitch 233. - In one embodiment,
current transformer 231 andcurrent sensor 301 combine to measure the current in AC line input and convert said current to a proportional DC voltage that can be read bylogic control unit 302. Furthermore, switch 233 may comprise a latching relay that provides a hard connect/disconnect ofAC line input 110 tooutlet 120 after a command fromlogic control unit 302. Switch 233 alternates between open and closed contacts. Furthermore,switch 233 holds its position until reset bylogic control unit 302, and will hold position without consuming any power in the relay coil K1. - In an exemplary embodiment,
logic control unit 302 comprises a microcontroller that receives input of the current in the AC line, controls the state ofswitch 233 and reads or otherwise assesses the state or position of the contacts ofreconnection device 234 andswitch 233. In addition,logic control unit 302 learns and stores the power profile for an electronic device connected tooutlet 120. In another exemplary embodiment,outlet circuit 130 further comprisesreconnection device 234, which is activated to turn onoutlet 120 whenoutlet circuit 130 is first connected toAC line input 110 or when full power is needed immediately atoutlet 120. - In an exemplary embodiment,
power disconnect 303 comprises a network of transistors Q1, Q2, Q3 which are used to conditionAC line input 110 to a safe level suitable forlogic control unit 302 and isolatelogic control unit 302 fromAC line input 110. In another embodiment,power disconnect 303 comprises relays in addition to, or in place of, the transistors of the prior embodiment. - Initial plug-in of
power strip 500 involves connectingpower strip 500 to an AC power source. In an exemplary method, upon initial plug-in ofpower strip 500 to a power source, all circuits ofoutlet circuit 130 are dead andswitch 233 is in the last position set bylogic control unit 302. This initial condition may or may not provide power tooutlet 120. When all the circuits are dead, there is no current flow intooutlet circuit 130. This is due to the isolation provided bypower disconnect 303 andreconnection device 234 in a normal, open position. In an exemplary embodiment,power disconnect 303 comprises transistors Q1, Q2, Q3 and capacitor C3. In this state, only leakage current will flow through transistors Q1, Q2 and the leakage current will be on the order of approximately tens of nanoamperes. Furthermore,current transformer 231 provides dielectric isolation from primary side to secondary side so that only small leakage current flows due to the inter-winding capacitance ofcurrent transformer 231. - With continued reference to
FIG. 5 , in an exemplary embodiment and for illustration purposes, a user may reconnect the circuit usingreconnection device 234 to establish a current path through diode D1, zener diode Z1, resistor R4,reconnection device 234 and zener diode Z3. Diode D1 serves to half-wave rectify the AC line to drop the peak to peak voltage in half. Zener diode Z1 further reduces the voltage from diode D1, for example to about 20 volts. Zener diode Z3 and resistor R4 form a current limited zener regulator that provides an appropriate DC voltage at the VDD input tologic control unit 302 whilereconnection device 234 is held. In addition, capacitor C2 smoothes the DC signal on zener diode Z3 and provides storage during the contact bounce ofreconnection device 234. Capacitor C2 is sized to provide sufficient storage during the start-up time oflogic control unit 302, and capacitor C2 in combination with resistor R4 provides a fast rising edge on the VDD input to properly resetlogic control unit 302. Furthermore, diode D5 isolates capacitor C2 from capacitor CS so the rise time constant of capacitor C2 and resistor R4 is not affected by the large capacitance of capacitor CS. When capacitor CS is poweringlogic control unit 302, the current of capacitor CS passes through diode D5. - In an exemplary method, if
reconnection device 234 is activated for a few milliseconds,logic control unit 302 is configured to initialize and immediately set up to provide its own power beforereconnection device 234 is released. This is accomplished from voltage doubler outputs VD1-VD3 and ZG1 oflogic control unit 302. First, output ZG1 is driven high to turn on transistor Q2. With transistor Q2 on, a current path is established through resistor R3 and zener diode Z2 providing a regulated voltage at the drain of transistor Q1. This regulated voltage is similar to that produced by zener diode Z3 and is appropriate for the VDD input oflogic control unit 302. Second, after the voltage on zener diode Z2 has stabilized for a few microseconds,logic control unit 302 outputs VD1-VD3 begin switching to produce a gate drive signal to turn on transistor Q1. The signals produced by outputs VD1-VD3 and components including capacitor C3, transistor Q3, capacitor C4, diode D3 and diode D4 produce a voltage at the gate of transistor Q1 that is about twice the voltage on input VDD oflogic control unit 302. This voltage doubling turns transistor Q1 on hard. Once transistor Q1 is on, the voltage at zener diode Z2 charges capacitor CS. In an exemplary embodiment, capacitor CS is a large storage capacitor that is used to powerlogic control unit 302 whenreconnection device 234 is not being activated. After capacitor CS has been charged for a few milliseconds, outputs VD1-VD3 and ZG1 return to a rest state and transistors Q1 and Q2 are turned off. In this embodiment,logic control unit 302 is operating off the stored charge in capacitor CS and not drawing power fromAC line input 110. Whenreconnection device 234 is no longer active, capacitor CS will continue to powerlogic control unit 302. - If
outlet 120 is idling and drawing substantially no power,logic control unit 302 may be able to disengage from drawing power and enter a “sleep” mode. In an exemplary method, and with further reference toFIG. 5 , whenlogic control unit 302 is operating from the stored energy in capacitor CS, a timing function is enabled inlogic control unit 302 that uses capacitor C5 to perform the timing function. Capacitor C5 is briefly charged by the CAPTIME output oflogic control unit 302 and over time capacitor C5 discharge rate will mimic the decay of the voltage on capacitor CS. Once capacitor C5 voltage at input CAPTIME reaches a low level,logic control unit 302 will set the state of outputs VD1-VD3 and ZG1 to again recharge capacitor CS from the AC line. This process repeats over and over so power is never lost tologic control unit 302. The recharge process takes only milliseconds to operate, depending on the size of capacitor CS. - Furthermore, in an exemplary method, when
logic control unit 302 is not busy recharging capacitor CS, switching relay K1, or measuring power drawn fromoutlet 120,logic control unit 302 is operating in a deep sleep mode that stops all, or substantially all, internal activity and waits for capacitor C5 to discharge. This sleep mode consumes very little power and allows the charge on storage capacitor CS to persist for many seconds. Ifreconnection device 234 is activated during the sleep mode,logic control unit 302 will resume normal operation and set or reset relay K1. Alternatively, if capacitor C5 voltage falls too low,logic control unit 302 will again recharge capacitor CS and then return to sleep mode. - While an electronic device is in an idle mode,
power strip 100 may continue to monitor for changes in the power drawn by the electronic device. In an exemplary method, whilelogic control unit 302 continuously goes in and out of sleep mode to re-power itself,logic control unit 302 will also periodically test the power being drawn fromoutlet 120. The period of power testing is much greater than that of capacitor CS charging and, for example, may be only tested every ten or more minutes. In accordance with an exemplary method, there are at least three possible outcomes from the result of power testing: 1) the device is operating and the switch is not in standby condition, 2) the device is not operating but the switch is not in a standby condition, or 3) the switch is in a standby condition. - For the outcome when the device is operating and the switch is not in a standby condition, relay K1 has been previously set to deliver power to
outlet 120 and power testing shows an appreciable load current is being drawn by the electronic device connected. An “appreciable load” may be defined by some fixed value programmed intologic control unit 302, or it may be the result of a number of power tests and be the typical load current for this electronic device. A power test result here will be interpreted as normal conditions andlogic control unit 302 will go back into sleep mode cycling until another time period, such as ten minutes, has passed when the power test will be made again. In another exemplary embodiment, the duration of the sleep mode cycling is determined by a user. For example, a user may set the sleep mode duration to be one, two, or five minutes and may do so using a dial, a digital input, a push button, keypad or any other suitable means now know or hereinafter devised. - For the outcome when the device is not operating but the switch is not in a standby condition, relay K1 has been previously set to deliver power to
outlet 120 and power testing shows a negligible load current being drawn by the device connected. The “negligible load” may be some fixed value programmed intologic control unit 302, or it may be the result of a number of power tests and be the typical minimum found for this electronic device. In either case the action taken bylogic control unit 302 will be to set relay K1 to an open condition by usinglogic control unit 302 outputs RELAY1-RELAY3 to energize relay coil K1. The state of relay K1 is determined bylogic control unit 302 testing for the presence of resistor R5, sincelogic control unit 302 may not know the previous state of relay K1, for example, starting from power off state. - For the outcome when the switch is in a standby condition, that is, relay K1 has been set to remove power from
outlet 120,logic control unit 302 must set relay K1 to a closed condition to allow AC power to be applied to the outlet. In an exemplary method, once relay K1 is set, a period of time is allowed to elapse before the power testing is done. This delay allows for the electronic device attached tooutlet 120 to initialize and enter a stable operating mode. Power measurements may now be made over some period of time to determine if the electronic device is in a low or high power state. If a high power state is determined, relay K1 remains set. If a low power state is determined, relay K1 is reset to open condition and power is again removed fromoutlet 120. Also,logic control unit 302 will again begin sleep mode cycling and power testing after a determined time period, for example, every ten minutes. - If a user wants to operate a device that is connected to
outlet 120 and that outlet is turned off, in an exemplary embodiment, activatingreconnection device 234 will immediately wakelogic control unit 302 from sleep mode. Since the wake up was from the activation ofreconnection device 234 and not due to power testing or capacitor CS recharging,logic control unit 302 will immediately set relay K1 to closed position to power the electronic device connected tooutlet 120. - In addition to the embodiments described above, various other elements may be implemented to enhance control and user experience. One way to enhance user control is to allow a user to select the operating mode of an outlet. In an exemplary embodiment,
power strip 100 further comprises a “Green Mode” switch that enables or disables the “green” mode operation. The green mode switch may be a hard, manual switch or it may be a signal tologic control unit 302. “Green” mode operation is the disengaging ofoutlet 120 fromAC line input 110 when substantially no load is being drawn atoutlet 120. A user may use the green mode switch to disenable green mode operation on various outlets when desired. For instance, this added control may be desirable on outlets that power devices with clocks or devices that need to be instantly on, such as a fax machine. - In one embodiment,
power strip 100 includes LED indicators, which may indicate whether an outlet is connected to the power line and drawing a load current. The LED indicators may indicate whether an outlet is active, that is, power is drawn by an electronic device and/or the outlet has power available even if an electronic device is not connected. In addition, a pulsing LED may be used to show when power testing is being done or to indicate the “heartbeat” of sleep mode recharging. - In another embodiment,
power strip 100 comprises at least one LCD display. The - LCD display may be operated by
logic control unit 302 to indicate the load power being provided tooutlet 120, for example during times of operation. The LCD may also provide information about the power saved or power consumed by operatingpower strip 100 in or out of a “green” mode. For example, LCD may display the sum total of watts saved during a certain time period, such as the life ofpower strip 100 or in a day. - Various embodiments may also be used to enhance the efficient use of the power strip and/or individual outlets in the power strip. One such embodiment is the implementation of a photocell or other optical sensor monitored by
logic control unit 302. The photocell determines whether light is present in the location ofpower strip 100 andlogic control unit 302 can use this determination to disengageoutlet 120 depending on the ambient light conditions. For example,logic control unit 302 may disengagepower output 120 during periods of darkness. In other words, the power strip may be turned off at night. Another example is devices do not need power if located in a dark room, such as an unused conference room in an office. Also, the power outputs may be turned off when the ambient light conditions exceed a certain level, which may be predetermined or user determined. - In another embodiment,
power strip 100 further comprises an internal clock.Logic control unit 302 may use the internal clock to learn which time periods show a high power usage atoutlet 120. This knowledge may be included to determine when an outlet should have power available. In an exemplary embodiment, the internal clock has quartz crystal accuracy. Also, the internal clock does not need to be set to an actual time. Furthermore, the internal clock may be used in combination with the photocell for greater power strip efficiency and/or accuracy. - The present invention has been described above with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications may be made to the exemplary embodiments without departing from the scope of the present invention. For example, the various exemplary embodiments can be implemented with other types of power strip circuits in addition to the circuits illustrated above. These alternatives can be suitably selected depending upon the particular application or in consideration of any number of factors associated with the operation of the system. Moreover, these and other changes or modifications are intended to be included within the scope of the present invention, as expressed in the following claims.
Claims (10)
1. A power strip configured to reduce power during idle operation of an electronic device, said power strip comprising:
a plurality of outlets configured to transmit power to the electronic device;
an outlet circuit configured to receive power from an alternating current (AC) line input and transmit power to a first outlet of said plurality of outlets;
a control circuit configured to receive an output power level signal and control the connection between said first outlet and the AC line input; and
a reconnection device configured to override said control circuit and reengage said first outlet and the AC line input, and wherein said reconnection device is further configured to disengage said first outlet and the AC line input.
2. The power strip of claim 1 , wherein said outlet circuit comprises:
a current measuring system configured to monitor current from the AC line input, wherein said current measuring system provides the output power level signal;
wherein said outlet circuit disengages transmitting power to said first outlet in response to said first outlet drawing substantially no power.
3. The power strip of claim 1 , further comprising a green mode switch configured to select an operating mode of said first outlet, wherein said operating mode is at least one of a normal mode and a green mode.
4. The power strip of claim 1 , wherein said reconnection device is located remotely from said power strip.
5. The power strip of claim 1 , wherein said reconnection device is configured to override a single control circuit.
6. The power strip of claim 1 , wherein said reconnection device is configured to override a plurality of control circuits.
7. A power strip configured to efficiently provide power to an electronic device, said power strip comprising:
a plurality of outlets configured to provide power to said electronic device; and
a control circuit configured to control the coupling of said plurality of outlets to an alternating current (AC) line input;
wherein said control circuit decouples said plurality of outlets in response to the current drawn by said plurality of outlets being below a threshold level, such that said plurality of outlets is effectively disengaged from the AC line input.
8. The power strip of claim 7 , further comprising a reconnection device configured to override said control circuit and re-engage said plurality of outlets to the AC line input.
9. The power strip of claim 7 , wherein said threshold level is a percentage of a determined approximate low power level of said electronic device, and wherein said percentage of said determined approximate low power level is at least one range of approximately 100-105%, approximately 100-110%, and approximately 110-120%.
10. The power strip of claim 7 , wherein said plurality of outlets comprises a first outlet with a first threshold level and a second outlet with a second threshold level, wherein said first threshold level is different from said second threshold level.
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US13/161,810 Abandoned US20110241444A1 (en) | 2008-06-27 | 2011-06-16 | Load condition controlled wall plate outlet system |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150236453A1 (en) * | 2011-08-31 | 2015-08-20 | Kimball P. Magee, Jr. | Power strips |
US20180309320A1 (en) * | 2013-08-06 | 2018-10-25 | Bedrock Automation Plattforms Inc. | Smart power system |
RU2688759C2 (en) * | 2016-11-26 | 2019-05-22 | Бейджин Сяоми Мобайл Софтвеа Ко., Лтд. | Method of power supply control, device for power splitter and power supply splitter |
US20200044479A1 (en) * | 2018-08-06 | 2020-02-06 | Mousa A.M.E. Mohammad | Power strip with uninterruptable power supply |
Families Citing this family (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9172275B2 (en) * | 2005-07-11 | 2015-10-27 | Minesh Bhakta | Power monitoring and control system and method |
JP2007336174A (en) * | 2006-06-14 | 2007-12-27 | Matsushita Electric Ind Co Ltd | Power line communication terminal device and power line communication circuit |
EP2087365A4 (en) * | 2006-10-27 | 2011-12-07 | Outsmart Power Systems Llc | Apparatus and method for mapping a wired network |
WO2009137817A1 (en) * | 2008-05-08 | 2009-11-12 | Outsmart Power Systems Llc | Device and method for measuring current and power in a plug or receptacle |
US7800252B2 (en) * | 2008-06-27 | 2010-09-21 | Igo, Inc. | Load condition controlled wall plate outlet system |
CA2731705A1 (en) * | 2008-07-23 | 2010-01-28 | Outsmart Power Systems, Llc | Providing additional electrical functionality to a node |
US8174148B2 (en) * | 2008-08-07 | 2012-05-08 | Crucs Holdings, Llc | Controllable electrical outlet and a method of operation thereof |
CA2736242A1 (en) * | 2008-09-05 | 2010-03-11 | Outsmart Power Systems, Llc | Apparatus and methods for mapping a wired network |
US20100201207A1 (en) * | 2009-02-06 | 2010-08-12 | Bruce Barton | Apparatus for controlling electrical power distribution to charging devices |
US20110032070A1 (en) * | 2009-08-10 | 2011-02-10 | Bleile Leonard | Wireless switching and energy management |
US8306639B2 (en) * | 2009-10-25 | 2012-11-06 | Greenwave Reality, Pte, Ltd. | Home automation group selection by color |
US8138626B2 (en) * | 2009-10-25 | 2012-03-20 | Greenwave Reality, Pte Ltd. | Power node for energy management |
US8916995B2 (en) * | 2009-12-02 | 2014-12-23 | General Electric Company | Method and apparatus for switching electrical power |
GB2478023B (en) * | 2010-02-17 | 2014-07-30 | Stewart John Robert Jackson | Electrical outlet apparatus |
US20110254383A1 (en) * | 2010-04-16 | 2011-10-20 | Motorola, Inc. | Smart module and method with minimal standby loss |
US8335936B2 (en) | 2010-05-10 | 2012-12-18 | Greenwave Reality, Pte Ltd. | Power node with network switch |
EP2386973A1 (en) * | 2010-05-11 | 2011-11-16 | Thomson Licensing | Methods, devices and computer program supports for password generation and verification |
US8716887B2 (en) * | 2010-06-03 | 2014-05-06 | General Electric Company | Systems and apparatus for monitoring and selectively controlling a load in a power system |
US20110313583A1 (en) * | 2010-06-22 | 2011-12-22 | Unified Packet Systems Corp. | Integrated Wireless Power Control Device |
WO2012018600A2 (en) * | 2010-07-26 | 2012-02-09 | Tyco Electronics Corporation | Controller circuit including a switch mode power converter and automatic recloser using the same |
US9482426B2 (en) | 2010-09-07 | 2016-11-01 | Venmill Industries, Inc. | Illuminable wall socket plates and systems and methods thereof |
EP2638479A4 (en) | 2010-11-12 | 2015-07-15 | Outsmart Power Systems Llc | Maintaining information integrity while minimizing network utilization of accumulated data in a distributed network |
ES2406181B1 (en) * | 2011-03-11 | 2014-05-21 | BSH Electrodomésticos España S.A. | Domestic appliance with a standby mode, and procedure for operating such domestic appliance |
US9020648B2 (en) | 2011-04-19 | 2015-04-28 | Cooper Technologies Company | Zero power appliance control, systems and methods |
US11158982B2 (en) | 2011-08-01 | 2021-10-26 | Snaprays Llc | Active cover plates |
US11888301B2 (en) | 2011-08-01 | 2024-01-30 | Snaprays, Llc | Active cover plates |
US10381788B2 (en) | 2011-08-01 | 2019-08-13 | Snaprays Llc | Active cover plates |
US9899814B2 (en) | 2011-08-01 | 2018-02-20 | Snaprays Llc | Active cover plates |
US10381789B2 (en) | 2011-08-01 | 2019-08-13 | Snaprays Llc | Active cover plates |
USD819426S1 (en) | 2013-10-29 | 2018-06-05 | Snaprays, Llc | Lighted wall plate |
US11664631B2 (en) | 2011-08-01 | 2023-05-30 | Snaprays, Llc | Environment sensing active units |
US10291007B2 (en) | 2012-10-30 | 2019-05-14 | Snaprays Llc | Active cover plates |
US9882361B2 (en) | 2011-08-01 | 2018-01-30 | Snaprays Llc | Active cover plates |
US9882318B2 (en) | 2011-08-01 | 2018-01-30 | Snaprays Llc | Active cover plates |
US9871324B2 (en) | 2011-08-01 | 2018-01-16 | Snap Rays LLC | Active cover plates |
US9917430B2 (en) | 2011-08-01 | 2018-03-13 | Snap Rays | Active cover plates |
US10109945B2 (en) | 2017-02-17 | 2018-10-23 | Snaprays, Llc | Active cover plates |
USD882377S1 (en) | 2011-09-06 | 2020-04-28 | Snaprays Llc | Lighted wall plate |
FR2980931A1 (en) * | 2011-09-30 | 2013-04-05 | France Telecom | DEVICE FOR CONTROLLING AN ELECTRICAL POWER SWITCH AND ASSOCIATED ELECTRICAL APPARATUS. |
US8439692B1 (en) | 2011-11-01 | 2013-05-14 | Hubbell Incorporated | Bus bar arrangements for multiple outlet electrical receptacles |
US9805890B2 (en) | 2011-11-07 | 2017-10-31 | Cooper Technologies Company | Electronic device state detection for zero power charger control, systems and methods |
US9048747B2 (en) | 2011-11-23 | 2015-06-02 | Zahid Ansari | Switched-mode power supply startup circuit, method, and system incorporating same |
TW201324981A (en) * | 2011-12-02 | 2013-06-16 | Powertech Ind Ltd | Socket having loading detection function |
TW201324980A (en) * | 2011-12-02 | 2013-06-16 | Powertech Ind Ltd | Dynamic energy-saving socket |
AU2013208273B2 (en) | 2012-01-10 | 2015-11-26 | Hzo, Inc. | Methods, apparatuses and systems for monitoring for exposure of electronic devices to moisture and reacting to exposure of electronic devices to moisture |
US9146207B2 (en) | 2012-01-10 | 2015-09-29 | Hzo, Inc. | Methods, apparatuses and systems for sensing exposure of electronic devices to moisture |
US9652014B2 (en) | 2012-03-12 | 2017-05-16 | Norman R. Byrne | Electrical energy management and monitoring system, and method |
US20140028097A1 (en) * | 2012-07-24 | 2014-01-30 | Dennis Harold AUGUR | Electrical outlet adapter with automatic power-on and power-off of peripheral outlets |
CN202995349U (en) * | 2012-12-26 | 2013-06-12 | 黄冠雄 | Micro-power-consumption standby system and thick film hybrid integrated circuit module |
JP2015513664A (en) | 2013-01-08 | 2015-05-14 | エイチズィーオー・インコーポレーテッド | Apparatus, system, and method for detecting and reacting to exposure of electronic devices to moisture |
WO2014110113A2 (en) * | 2013-01-08 | 2014-07-17 | Hzo, Inc. | Apparatuses, systems, and methods for reducing power to ports of electronic devices |
US20140265566A1 (en) * | 2013-03-16 | 2014-09-18 | Hap Nguyen | System and Method of Eliminating Wasted Energy Known as Vampire Electricity or Phantom Load Loss |
US9965007B2 (en) | 2013-08-21 | 2018-05-08 | N2 Global Solutions Incorporated | System and apparatus for providing and managing electricity |
US20170324270A1 (en) * | 2013-12-26 | 2017-11-09 | Calvin Shie-Ning Wang | Standby circuit, and outlet, plug, and device having the same |
US10541557B2 (en) | 2016-10-07 | 2020-01-21 | Norman R. Byrne | Electrical power cord with intelligent switching |
USD821180S1 (en) | 2017-02-01 | 2018-06-26 | Ontel Products Corporation | Lighted outlet cover plate |
USD821179S1 (en) | 2017-02-01 | 2018-06-26 | Ontel Products Corporation | Lighted outlet cover plate |
US10373773B2 (en) | 2017-02-17 | 2019-08-06 | Snaprays Llc | Active cover plates |
US10958019B2 (en) * | 2017-08-29 | 2021-03-23 | Computime Ltd. | Smart and robust wall socket with integrated universal serial bus (USB) |
US11424561B2 (en) | 2019-07-03 | 2022-08-23 | Norman R. Byrne | Outlet-level electrical energy management system |
US11277024B2 (en) | 2020-07-24 | 2022-03-15 | ZQ Power, LLC | Devices, systems, and methods for reducing standby power consumption |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080164768A1 (en) * | 2007-01-09 | 2008-07-10 | Litwack Mark W | Energy-saving electrical adaptor |
Family Cites Families (138)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3444362A (en) * | 1964-10-30 | 1969-05-13 | Teledyne Inc | Antilogarithmic function generator |
US3678416A (en) * | 1971-07-26 | 1972-07-18 | Richard S Burwen | Dynamic noise filter having means for varying cutoff point |
US4215276A (en) * | 1978-03-20 | 1980-07-29 | Janeway William F | Remote control of electrical power distribution system and method |
USRE36098E (en) * | 1982-02-04 | 1999-02-16 | Vlt Corporation | Optimal resetting of the transformer's core in single-ended forward converters |
JPS5958921A (en) * | 1982-09-28 | 1984-04-04 | Murata Mfg Co Ltd | Stabilized power supply circuit |
US4503362A (en) * | 1983-06-01 | 1985-03-05 | Intent Patent A.G. | Frequency stabilized, gain controlled ballast system |
US4731549A (en) * | 1984-10-15 | 1988-03-15 | Hiddleson Thomas V | Current sensor and control device |
US4675537A (en) * | 1985-04-01 | 1987-06-23 | Voltec Corporation | Current-controlled on/off power line switching of electrical devices |
US4659979A (en) * | 1985-11-27 | 1987-04-21 | Burr-Brown Corporation | High voltage current source circuit and method |
US4874962B1 (en) * | 1987-05-21 | 1995-04-04 | Albert L Hermans | Low power, leakage current switching circuit |
US4970623A (en) * | 1988-12-29 | 1990-11-13 | Hewlett-Packard Company | Peripheral device power activation circuit and method therefor |
US5017844A (en) * | 1990-04-30 | 1991-05-21 | Rca Licensing Corporation | Disabling arrangement for a circuit operating at a deflection rate |
US5014178A (en) * | 1990-05-14 | 1991-05-07 | Power Integrations, Inc. | Self powering technique for integrated switched mode power supply |
US5063164A (en) * | 1990-06-29 | 1991-11-05 | Quantum Group, Inc. | Biomimetic sensor that simulates human response to airborne toxins |
US5313381A (en) * | 1992-09-01 | 1994-05-17 | Power Integrations, Inc. | Three-terminal switched mode power supply integrated circuit |
US5285369A (en) * | 1992-09-01 | 1994-02-08 | Power Integrations, Inc. | Switched mode power supply integrated circuit with start-up self-biasing |
GB9219663D0 (en) | 1992-09-17 | 1992-10-28 | Rca Thomson Licensing Corp | Switch mode power supply with low input current distortion |
US5461288A (en) * | 1993-01-27 | 1995-10-24 | Chaves; Neal | Power management device for large electronic flash units |
US5481178A (en) * | 1993-03-23 | 1996-01-02 | Linear Technology Corporation | Control circuit and method for maintaining high efficiency over broad current ranges in a switching regulator circuit |
US5414475A (en) * | 1993-08-11 | 1995-05-09 | Zenith Electronics Corp. | Method of operating a low standby power system for a television receiver |
US5455487A (en) * | 1993-09-22 | 1995-10-03 | The Watt Stopper | Moveable desktop light controller |
US5598042A (en) * | 1993-09-22 | 1997-01-28 | The Watt Stopper | Moveable desktop load controller |
US5457595A (en) * | 1993-10-18 | 1995-10-10 | Hubbell Incorporated | Low-power relay operating circuit |
US6933366B2 (en) * | 1996-12-27 | 2005-08-23 | Tripep Ab | Specificity exchangers that redirect antibodies to bacterial adhesion receptors |
JPH08195252A (en) * | 1995-01-19 | 1996-07-30 | Fuminori Hirose | Power source tap |
US5563455A (en) * | 1995-02-27 | 1996-10-08 | Sun Microsystems, Inc. | Method and apparatus for sequencing and controlling power distribution |
CN1053772C (en) * | 1995-04-05 | 2000-06-21 | 皇家菲利浦电子有限公司 | Switched-mode power supply |
US5615107A (en) * | 1995-05-16 | 1997-03-25 | Fiskars Inc. | Power control method and apparatus |
US5541457A (en) * | 1995-06-12 | 1996-07-30 | Morrow; Rodney J. | Electrical current actuated accessory outlet |
DE59609441D1 (en) * | 1995-08-07 | 2002-08-22 | Aspro Technology Ag Wildegg | Switching device for de-energizing a transformer |
US5579201A (en) * | 1995-08-23 | 1996-11-26 | Karageozian; Vicken H. | Modified electrical strip for energizing/de-energizing secondary devices simultaneously with a main device |
US5699051A (en) * | 1996-07-29 | 1997-12-16 | Billig; Richard R. | Load monitoring electrical outlet system |
WO1998033267A2 (en) * | 1997-01-24 | 1998-07-30 | Fische, Llc | High efficiency power converter |
US5923103A (en) * | 1997-03-31 | 1999-07-13 | Pulizzi Engineering, Inc. | Switched-output controller apparatus with repeater function and method for constructing same |
US5995384A (en) * | 1997-07-31 | 1999-11-30 | Philips Electronics North America Corporation | Functional on/off switch for switched-mode power supply circuit with burst mode operation |
US6025699A (en) * | 1997-12-12 | 2000-02-15 | Dell Usa, L.P. | Self discharge of batteries at high temperatures |
US6226190B1 (en) * | 1998-02-27 | 2001-05-01 | Power Integrations, Inc. | Off-line converter with digital control |
US5990405A (en) * | 1998-07-08 | 1999-11-23 | Gibson Guitar Corp. | System and method for generating and controlling a simulated musical concert experience |
KR100273439B1 (en) * | 1998-08-11 | 2001-01-15 | 구자홍 | Apparatus and method for reducing power consumption of a power supply |
KR19990078513A (en) * | 1998-12-16 | 1999-11-05 | 김형광 | Auto power switchgear |
DE19916915B4 (en) * | 1999-04-14 | 2005-08-11 | Infineon Technologies Ag | Switching power supply and method for determining the supply voltage in a switched-mode power supply |
JP3358588B2 (en) * | 1999-06-04 | 2002-12-24 | 株式会社村田製作所 | Switching power supply circuit |
US6057607A (en) * | 1999-07-16 | 2000-05-02 | Semtech Corporation | Method and apparatus for voltage regulation in multi-output switched mode power supplies |
JP2001053597A (en) * | 1999-08-06 | 2001-02-23 | Matsushita Electric Works Ltd | Illumination sensor and electronic automatic switch |
KR20000006660A (en) * | 1999-09-22 | 2000-02-07 | 김형광 | Data protection recepatacles for power saving |
JP2001136661A (en) | 1999-11-01 | 2001-05-18 | Funai Electric Co Ltd | Power supply controller |
DE10007696A1 (en) * | 2000-02-19 | 2001-08-23 | Bosch Gmbh Robert | Electric motor, especially for raising and lowering windows in motor vehicles, has control electronics with at least one essentially rectangular circuit board in gearbox housing |
US6529354B1 (en) * | 2000-03-03 | 2003-03-04 | Switch Power, Inc. | Power-up and no-load/light load protective mechanisms for DC:DC converters |
US6528902B1 (en) * | 2000-03-07 | 2003-03-04 | Bits Ltd | Device for controlling power distribution to subsystems |
US6498466B1 (en) * | 2000-05-23 | 2002-12-24 | Linear Technology Corp. | Cancellation of slope compensation effect on current limit |
US6501195B1 (en) * | 2000-06-21 | 2002-12-31 | Bits Ltd | Device for controlling power distribution to subsystems |
US6212079B1 (en) * | 2000-06-30 | 2001-04-03 | Power Integrations, Inc. | Method and apparatus for improving efficiency in a switching regulator at light loads |
US6961856B1 (en) * | 2000-07-09 | 2005-11-01 | Peter Kouropoulus | Personal computer protection device |
US6525514B1 (en) * | 2000-08-08 | 2003-02-25 | Power Integrations, Inc. | Method and apparatus for reducing audio noise in a switching regulator |
CN100393080C (en) * | 2000-09-01 | 2008-06-04 | 邻近链接专利股份公司 | Communications terminal, a system and a method for internet/network telephony |
US6741442B1 (en) * | 2000-10-13 | 2004-05-25 | American Power Conversion Corporation | Intelligent power distribution system |
KR20020030869A (en) | 2000-10-18 | 2002-04-26 | 손찬우 | Multi consent for saving power |
US6339314B1 (en) * | 2000-12-27 | 2002-01-15 | Philips Electronics North America Corporation | Battery charger circuit with low standby power dissipation |
US6738914B2 (en) * | 2001-01-05 | 2004-05-18 | Motorola, Inc. | Method and apparatus for determining whether to wake up a system by detecting a status of a push button switch that is remotely located from the system |
DE10106132A1 (en) * | 2001-02-10 | 2002-08-14 | Philips Corp Intellectual Pty | Wake-up circuit for an electrical device |
TW523643B (en) | 2001-03-06 | 2003-03-11 | Inca Systems Co Ltd | Power saving outlet device that allows remote control |
US6480401B2 (en) * | 2001-03-13 | 2002-11-12 | Astec International Limited | Method and apparatus for reducing standby power in power supplies |
US20020135474A1 (en) * | 2001-03-21 | 2002-09-26 | Sylliassen Douglas G. | Method and device for sensor-based power management of a consumer electronic device |
US6861956B2 (en) * | 2001-07-10 | 2005-03-01 | Yingco Electronic Inc. | Remotely controllable wireless energy control unit |
US7288574B2 (en) * | 2001-07-18 | 2007-10-30 | Eckert C Edward | Two-phase oxygenated solution and method of use |
KR100418197B1 (en) * | 2001-08-28 | 2004-02-11 | 페어차일드코리아반도체 주식회사 | A burst mode Switched-mode power supply |
US6414863B1 (en) * | 2001-08-30 | 2002-07-02 | Texas Instruments Incorporated | Frequency control circuit for unregulated inductorless DC/DC converters |
US6747443B2 (en) | 2001-08-31 | 2004-06-08 | Power Integrations, Inc. | Method and apparatus for trimming current limit and frequency to maintain a constant maximum power |
US7009530B2 (en) | 2001-09-13 | 2006-03-07 | M&Fc Holding, Llc | Modular wireless fixed network for wide-area metering data collection and meter module apparatus |
AT5418U1 (en) * | 2001-10-11 | 2002-06-25 | Geyer Imp Exp Ges M B H | DISTRIBUTOR WITH SEVERAL SOCKETS |
US6519166B1 (en) * | 2001-10-27 | 2003-02-11 | Li Li | Apparatus and method for controlled preload operation of an electrical converter |
JP2003133009A (en) | 2001-10-29 | 2003-05-09 | Aihou:Kk | Socket strip |
US6995807B2 (en) * | 2001-11-02 | 2006-02-07 | Sony Corporation | Micro-power stand-by mode |
US7068022B2 (en) | 2001-11-13 | 2006-06-27 | Power Integrations, Inc. | Method and apparatus for a switch mode power supply that generates a high pulse width modulation gain while maintaining low noise sensitivity |
US6744150B2 (en) * | 2001-12-03 | 2004-06-01 | Neven V. Rendic | Outlet strip controlled by PC using low voltage powertap |
US6586849B2 (en) * | 2001-12-04 | 2003-07-01 | Morton Tarr | Electrical power strip for use with a computer and associated peripheral devices |
GB2386004B (en) * | 2001-12-07 | 2005-08-24 | Peter Steven Robertson | Socket assembly |
US6833692B2 (en) * | 2002-01-17 | 2004-12-21 | Power Integrations, Inc. | Method and apparatus for maintaining an approximate constant current output characteristic in a switched mode power supply |
US6853173B2 (en) * | 2002-01-25 | 2005-02-08 | Broadcom Corporation | Programmable dual mode hysteretic power output controller |
CN2534717Y (en) * | 2002-03-21 | 2003-02-05 | 周义雄 | Primary/secondary socket controller |
CN1452308A (en) * | 2002-04-18 | 2003-10-29 | 姜涛 | Environment protection switch power supply |
US7000127B2 (en) * | 2002-04-30 | 2006-02-14 | Dell Products L.P. | Power saving circuit for display system |
US6759763B2 (en) * | 2002-05-10 | 2004-07-06 | Bits Ltd | Apparatus for controlling power distribution to devices |
US6759762B2 (en) * | 2002-05-10 | 2004-07-06 | Bits Ltd | Device for controlling power distribution to subsystems |
JP2004023918A (en) * | 2002-06-18 | 2004-01-22 | Sankyo Seiki Mfg Co Ltd | Power control circuit |
US6754092B2 (en) * | 2002-06-27 | 2004-06-22 | International Business Machines Corporation | Method and apparatus for reducing power consumption for power supplied by a voltage adapter |
US6940272B2 (en) * | 2002-10-10 | 2005-09-06 | Green Socket Ltd. | Electric socket control device |
US20040070299A1 (en) * | 2002-10-12 | 2004-04-15 | Cyr Christian Michael | Anti-gravity machine |
US6661679B1 (en) * | 2002-10-28 | 2003-12-09 | System General Corporation | PWM controller having adaptive off-time modulation for power saving |
JP2004187355A (en) * | 2002-11-29 | 2004-07-02 | Fujitsu Ltd | Power supply control method, current/voltage conversion circuit, and electronic device |
US6781356B1 (en) * | 2003-03-24 | 2004-08-24 | System General Corp. | PWM controller having a modulator for saving power and reducing acoustic noise |
JPWO2005006527A1 (en) | 2003-07-15 | 2006-08-24 | サンケン電気株式会社 | Power supply device and control method of power supply device |
US7106602B2 (en) * | 2003-07-29 | 2006-09-12 | Astec International Limited | Switching-bursting method and apparatus for reducing standby power and improving load regulation in a DC—DC converter |
US20050041360A1 (en) * | 2003-08-20 | 2005-02-24 | E.G.O. North America, Inc. | Systems and methods for achieving low power standby through interaction between a microcontroller and a switching mode power supply |
US7027300B2 (en) * | 2003-09-16 | 2006-04-11 | Mobility Electronics, Inc. | Compact electronics plenum |
JP3691500B2 (en) | 2003-10-29 | 2005-09-07 | 松下電器産業株式会社 | Switching power supply |
US7808122B2 (en) * | 2003-11-07 | 2010-10-05 | Menas Gregory W | Automatic sensing power systems and methods |
US6903536B2 (en) * | 2003-11-12 | 2005-06-07 | System General Corp. | PFC-PWM controller having interleaved switching |
KR100426331B1 (en) * | 2004-02-10 | 2004-04-08 | 유한전자 주식회사 | A multifunctional multi-tap(concent) for intercepting a stand-by electric power and control method employing the same |
EP1769316B1 (en) * | 2004-05-19 | 2014-10-01 | Electronic Data Control Pty Ltd. | Power saver controller |
US8301914B2 (en) * | 2004-05-19 | 2012-10-30 | Giuseppe Antonio Gelonese | Power supply control device |
US7167087B2 (en) * | 2004-10-20 | 2007-01-23 | Balboa Instruments, Inc. | Remote SPA monitor |
WO2006046205A1 (en) * | 2004-10-28 | 2006-05-04 | Koninklijke Philips Electronics N.V. | Ultra low power stand-by supply |
WO2006062329A1 (en) | 2004-12-06 | 2006-06-15 | Jong-Woon Hong | The automatic braking apparatus for waiting electric power and multi-outlet using it |
US7272025B2 (en) * | 2005-01-18 | 2007-09-18 | Power Integrations, Inc. | Method and apparatus to control either a regulated or an unregulated output of a switching power supply |
US7253594B2 (en) * | 2005-01-19 | 2007-08-07 | Texas Instruments Incorporated | Reducing power/area requirements to support sleep mode operation when regulators are turned off |
JP2008533960A (en) * | 2005-03-11 | 2008-08-21 | エヌエックスピー ビー ヴィ | Switched mode power conversion device and operation method thereof |
ITMI20050521A1 (en) | 2005-03-30 | 2006-09-30 | Arti & Mestieri S N C I Legni | CONNECTING DEVICE FOR DOMESTIC ELECTRICAL EQUIPMENT WITH AN ELECTRICITY DISTRIBUTION NETWORK |
EP1875574A2 (en) | 2005-04-06 | 2008-01-09 | James Dunne | Power distribution device |
CN1869877A (en) * | 2005-05-28 | 2006-11-29 | 鸿富锦精密工业(深圳)有限公司 | Electric saving device and method |
TWI312220B (en) * | 2005-06-01 | 2009-07-11 | Asustek Comp Inc | Method and charging apparatus controlled by computer for converting input power into required charging voltage and charging current |
US20060273663A1 (en) * | 2005-06-02 | 2006-12-07 | Bradley Emalfarb | Power outlet with automatic shutoff |
JP4481879B2 (en) | 2005-06-03 | 2010-06-16 | パナソニック株式会社 | Switching power supply |
JP3115528U (en) * | 2005-08-05 | 2005-11-10 | 勝徳國際研發股▲ふん▼有限公司 | Energy saving outlet |
WO2007027063A1 (en) | 2005-09-02 | 2007-03-08 | Sun Young Kim | Automatically standby power cut-off plug socket |
US7345894B2 (en) | 2005-09-27 | 2008-03-18 | Carl Sawtell | Cascode switch power supply |
US7626362B2 (en) * | 2005-09-30 | 2009-12-01 | International Components Corporation | Rapid charge lithium ion battery charger |
TWM289925U (en) | 2005-11-09 | 2006-04-21 | Sino American Electronic Co Lt | Smart-type battery charger with equalizer circuit |
DE102005055160B4 (en) * | 2005-11-18 | 2011-12-29 | Power Systems Technologies Gmbh | Control circuit for current and voltage control in a switching power supply |
KR100669470B1 (en) * | 2005-12-22 | 2007-01-16 | 삼성에스디아이 주식회사 | Method of compensating soc for battery and battery management system using the same |
EP1819027A3 (en) | 2006-02-08 | 2009-11-25 | Nader Jarmooz | Energy saving apparatus and method |
US8013572B2 (en) * | 2006-04-11 | 2011-09-06 | Andrew Rodgers | Recharging device for use with portable electronic devices |
GB2438655B (en) | 2006-05-23 | 2008-05-14 | Galen Alexander Brown | Electricity supply control device |
TW200805866A (en) * | 2006-07-04 | 2008-01-16 | Powertech Ind Ltd | Charger for current socket and power transmission method |
WO2008017877A1 (en) | 2006-08-11 | 2008-02-14 | Karl Dorn | Electrical connection circuit |
CN101127447A (en) * | 2006-08-18 | 2008-02-20 | 鸿富锦精密工业(深圳)有限公司 | Charging circuit |
GB2442031A (en) | 2006-09-25 | 2008-03-26 | Peter John Ensinger | Standby saver |
US7313004B1 (en) * | 2006-12-21 | 2007-12-25 | System General Corp. | Switching controller for resonant power converter |
TWI343679B (en) * | 2007-04-20 | 2011-06-11 | Primax Electronics Ltd | Power strip device |
US7808802B2 (en) | 2007-09-06 | 2010-10-05 | Jun Cai | Isolated switched-mode power supply with output regulation from primary side |
US7800251B2 (en) | 2007-10-18 | 2010-09-21 | Hammerhead International, Llc | System and method for load control |
US9171454B2 (en) * | 2007-11-14 | 2015-10-27 | Microsoft Technology Licensing, Llc | Magic wand |
US7843088B2 (en) * | 2008-03-07 | 2010-11-30 | Harry Leonard Perper | Energy conserving (stand-by mode) power saving design for battery chargers and power supplies |
TWI359541B (en) * | 2008-04-09 | 2012-03-01 | Master/slave outlet system | |
US7779278B2 (en) | 2008-05-29 | 2010-08-17 | Igo, Inc. | Primary side control circuit and method for ultra-low idle power operation |
US7952895B2 (en) | 2008-05-29 | 2011-05-31 | Power Integrations, Inc. | Method and apparatus for implementing an unregulated dormant mode in a power converter |
US7800252B2 (en) * | 2008-06-27 | 2010-09-21 | Igo, Inc. | Load condition controlled wall plate outlet system |
US7795759B2 (en) | 2008-06-27 | 2010-09-14 | iGo, Inc | Load condition controlled power strip |
-
2008
- 2008-07-25 US US12/180,411 patent/US7800252B2/en not_active Expired - Fee Related
-
2010
- 2010-08-20 US US12/860,636 patent/US7964995B2/en not_active Expired - Fee Related
-
2011
- 2011-06-16 US US13/161,810 patent/US20110241444A1/en not_active Abandoned
- 2011-06-16 US US13/161,753 patent/US20110241443A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080164768A1 (en) * | 2007-01-09 | 2008-07-10 | Litwack Mark W | Energy-saving electrical adaptor |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150236453A1 (en) * | 2011-08-31 | 2015-08-20 | Kimball P. Magee, Jr. | Power strips |
US9742127B2 (en) * | 2011-08-31 | 2017-08-22 | Kimball P. Magee, Jr. | Power strips |
US20180309320A1 (en) * | 2013-08-06 | 2018-10-25 | Bedrock Automation Plattforms Inc. | Smart power system |
US10944289B2 (en) * | 2013-08-06 | 2021-03-09 | Bedrock Automation Plattforms Inc. | Smart power system |
US20210194278A1 (en) * | 2013-08-06 | 2021-06-24 | Bedrock Automation Platforms Inc. | Smart power system |
US11605953B2 (en) * | 2013-08-06 | 2023-03-14 | Bedrock Automation Platforms Inc. | Smart power system |
RU2688759C2 (en) * | 2016-11-26 | 2019-05-22 | Бейджин Сяоми Мобайл Софтвеа Ко., Лтд. | Method of power supply control, device for power splitter and power supply splitter |
US10852798B2 (en) | 2016-11-26 | 2020-12-01 | Beijing Xiaomi Mobile Software Co., Ltd. | Power supply control method and apparatus for power strip, and storage medium |
US20200044479A1 (en) * | 2018-08-06 | 2020-02-06 | Mousa A.M.E. Mohammad | Power strip with uninterruptable power supply |
Also Published As
Publication number | Publication date |
---|---|
US20100314952A1 (en) | 2010-12-16 |
US7964995B2 (en) | 2011-06-21 |
US20110241444A1 (en) | 2011-10-06 |
US7800252B2 (en) | 2010-09-21 |
US20090322159A1 (en) | 2009-12-31 |
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Legal Events
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AS | Assignment |
Owner name: IGO, INC., ARIZONA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:DUBOSE, RICHARD G.;THORNTON, WALTER;HEIL, MICHAEL D.;REEL/FRAME:026467/0721 Effective date: 20080725 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |