WO2011024062A2 - Lighting system and method - Google Patents

Lighting system and method Download PDF

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Publication number
WO2011024062A2
WO2011024062A2 PCT/IB2010/002100 IB2010002100W WO2011024062A2 WO 2011024062 A2 WO2011024062 A2 WO 2011024062A2 IB 2010002100 W IB2010002100 W IB 2010002100W WO 2011024062 A2 WO2011024062 A2 WO 2011024062A2
Authority
WO
WIPO (PCT)
Prior art keywords
power
input
source
light
circuit module
Prior art date
Application number
PCT/IB2010/002100
Other languages
French (fr)
Other versions
WO2011024062A3 (en
Inventor
Roshini Dsouza
Abhimanyu Sahu
Original Assignee
Schneider Electric Industries Sas
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schneider Electric Industries Sas filed Critical Schneider Electric Industries Sas
Priority to RU2012106752/07A priority Critical patent/RU2574605C2/en
Priority to CN2010800380528A priority patent/CN102577619A/en
Publication of WO2011024062A2 publication Critical patent/WO2011024062A2/en
Publication of WO2011024062A3 publication Critical patent/WO2011024062A3/en

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Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10Controlling the light source
    • H05B47/105Controlling the light source in response to determined parameters
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10Controlling the light source
    • H05B47/17Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20Responsive to malfunctions or to light source life; for protection

Definitions

  • At least one embodiment in accordance with the present invention relates generally to modular lighting systems and mediods and more particularly to a dual power output, multiple input source, efficient lighting system. Discussion of Related Art
  • Solar, battery and electric grid lighting systems are well known, including those that use incandescent bulbs, fluorescent bulbs, and light emitting diodes (LEDs) as light sources.
  • LEDs light emitting diodes
  • the availability of reliable electric grid power systems remains spotty at best and alternate source systems can be expensive to install and operate and are not always compatible with available lighting sources. Further, alternate source lighting systems often do not provide sufficient room level lighting.
  • kerosene lamps are often used, and while these can reliably provide continuous light, they can be dangerous to use, cause health problems, and contribute to increases in CO 2 .
  • At least one embodiment discussed herein is directed to an efficient lighting system for use particularly in areas having unreliable and or prohibitively expensive electric grid systems.
  • a first aspect of the invention is directed to a light assembly that includes a first input to receive input power from a first power source, a second input to receive input power from a second power source, a third input to receive input power from a third power source, a driver circuit coupled to the first input, the second input and the third input, and a light source coupled to the driver circuit and configured to provide output light in response to power provided by the driver circuit.
  • the driver circuit is configured to detect unavailability of at least one of the first power source and the second power source, and in response, operate the light source in a low power, low light intensity mode of operation using power provided at the third input.
  • the driver circuit may be configured to detect availability of at least one of the first power source and the second power source, and in response, operate the light source in a high power, high intensity mode of operation using power provided at one of the first input and the second input.
  • the first input may be configured to receive input AC power
  • the second input may be configured to receive power from a solar power system
  • the driver circuit may be configured to detect availability of both AC power and solar power, and in response, operate the light source in the high power, high intensity mode of operation using the solar power.
  • the third input may be configured to receive power from a battery
  • the light assembly may further include circuitry to charge the battery using power provided at one of the first input and the second input.
  • the light assembly may further include at least one indicator light coupled to the third input and configured to provide an indication of operation of the light assembly from battery and to provide an indication of remaining on time in battery mode of operation.
  • Another aspect of the invention is directed to a method of illuminating a room.
  • the method includes providing a light source, coupling the light source to a first power source, operating the light source in a high power mode of operation from the first power source, detecting failure of the first power source, and in response to the detection of failure, operating the light source in a low power mode of operation from a battery.
  • the first power source may include an LED array
  • operating the light source in the high power mode may include providing electrical current to the LED array having a first magnitude
  • operating the light source in the low power mode may include providing electrical current to the LED array having a second magnitude less than the first magnitude.
  • the method may further include detecting operation in the low power mode, and providing an indication of operation in the low power mode and an indication of remaining on time in low power mode.
  • the light source may have a first input to receive input power from an AC power source, and a second input to receive input power from a solar power source, and the method may further include detecting available power from both the AC power source and the solar power source, and in response, operating the light source using power from the solar power source.
  • a light assembly that includes a housing having at least one input to receive input power; a light source mounted to the housing; a first circuit module contained in the housing and coupled to the light source and the input and configured to provide power to the light source to provide output light from the light source, the first circuit module being configured to receive DC input power from the at least one input, a second removable circuit module removably mounted in the housing and configured to receive AC power at a second input and provide DC power to the first circuit module, and a third removable circuit module removably mounted in the housing and configured to receive at a third input DC power having a first voltage and to provide DC power to the first circuit module having a second voltage.
  • the light source may include an LED array
  • the light assembly may further include a first cable to couple the first circuit module to the second removable circuit module and a second cable to couple the first circuit module to the third removable circuit module.
  • the light assembly may further include a plurality of indicator
  • LEDs coupled to the first circuit module and configured to provide an indication of remaining battery time
  • the first circuit module may be configured to detect loss of AC power at the second input or loss of DC power at the third input, and in response, operate the light source in a low power mode of operation.
  • Yet another aspect of the invention is directed to a method of configuring and operating a light assembly.
  • the method includes providing a light assembly having a housing, a light source mounted to the housing, and a first circuit module contained in the housing, the first circuit module being configured to provide power to the light source from a first DC power source at a first input, coupling a battery to the first input and operating the light assembly using power from the battery, providing a second circuit module, the second circuit module having a second input to receive input power and having an output to provide DC power to the first circuit module to power the light source from power provided at the second input, installing the second circuit module in the housing, and coupling a second power source to the second input and operating the light assembly from power provided by the second power source.
  • the method may further include providing a third circuit module, the third circuit module having a third input to receive input power and having an output to provide DC power to the first circuit module to power the light source from power provided at the third input, installing the third circuit module in the housing, and coupling a third power source to the third input and operating the light assembly from power provided by the third power source.
  • the second power source may be an AC power source
  • the second circuit module may include an AC to DC converter
  • the third power source may be a solar power source
  • the third circuit module may include a DC to DC converter.
  • the method may further include detecting presence of both the AC power source and the solar power source, and in response, operating the light source in a high power mode from power from the solar power source.
  • the method may also include detecting loss of at least one of the AC power source and the solar power source, and in response, operating the light source from the battery in a low power mode, having a power draw less than that of the high power mode.
  • the light source may include an array of LEDs.
  • FIG. 1 shows a functional block diagram of a lighting system in accordance with one embodiment
  • FIG. 2 shows an LED array used in the embodiment of FIG. 1 ;
  • FIG. 3 shows an exploded view of a lighting assembly in accordance with one embodiment
  • FIG. 4 shows a first perspective view of the lighting assembly of FIG. 3
  • FIG. 5 shows a second perspective view of the lighting assembly of FIG. 3.
  • FIG. 6 shows a lighting assembly in accordance with one embodiment mounted on the wall of a room
  • FIG. 7 shows a functional block diagram of an upgradeable lighting assembly in accordance with one embodiment.
  • FIG. 8 shows a functional block diagram of an upgradeable lighting assembly in accordance with one embodiment.
  • At least some embodiments disclosed herein are directed to modular, efficient lighting systems and methods, including LED lighting systems, operable from DC power sources including battery power sources, fuel cells, and solar power, and AC power sources including a utility electrical grid, generator or other AC power source. Specific embodiments are designed in a modular configuration, such that one or more modules may be replaced or added to a lighting system to provide connection to a different type of power source. At least some embodiments are directed to LED lighting systems having LEDs arranged to provide full room lighting from a compact wall-mountable unit, and are configurable for dual power mode operation to allow low power operation on battery power.
  • FIG. 1 is directed to a functional block diagram of a modular LED lighting system 100 in accordance with one embodiment.
  • the lighting system 100 includes an array of LEDs 102, a dual power output control circuit 104, an LED driver circuit 106, a detection circuit 108, mode switches 110 and 112, a battery monitoring circuit 114, a charge control circuit 116, a DC-DC converter 118, a switch mode power supply (SMPS) 120, A battery 122, a solar power source 124, and an AC power source 126.
  • SMPS switch mode power supply
  • functional circuits may be grouped differently than shown in FIG. 1.
  • the LED array 102 is coupled between the dual power output control circuit 104 and the LED driver 106.
  • Mode switches 110 and 112 are coupled between the LED driver circuit 106 and the battery 122, and the mode switches are also coupled to an output of the charge controller 116.
  • the DC-DC converter 118 is coupled between the solar power source 124 and the charge controller 116.
  • the SMPS 120 is coupled between the AC power source and the charge controller 116.
  • the battery 122 is coupled to the charge controller 116, mode switch 112 and the battery monitoring circuit 114.
  • the detection circuit 108 is coupled to the SMPS 120 output, DC -DC converter 118 output and the dual power output control circuit 104.
  • the LED array In operation, light is provided by the LED array from power provided from one of the AC power source 126, the solar power source 124 and the battery 122.
  • the SMPS When operated from the AC power source, the SMPS receives the input AC power and converts the AC power to DC power.
  • the input AC voltage is 230 volts at 50 Hz, although in other embodiments, other input voltages at other frequencies may also be used.
  • the output of the SMPS is 14.38 volts, but other output voltages may also be used.
  • the charge controller 116 receives the voltage from the SMPS and provides an output voltage to the mode switches 110 and 112. The charge controller also provides a charging voltage for the battery 122 (if a battery is included in the system). In AC mode of operation (and in solar mode of operation), mode switch 112 is open to isolate the battery, while mode switch 110 is configured to couple the output of the charge controller to the LED driver.
  • the LED driver circuit receives the output voltage of the charge controller 116 and provides an output constant current for the LED array 102 to light the LEDs.
  • the dual power output control circuit 104 is used to provide a low power mode of operation of the lighting system 100 when operated from battery power. In the AC and solar modes of operation, the dual power output control circuit is controlled to operate in normal, high power mode of operation.
  • Operation in solar mode is the same as in AC mode except that the charge controller 116 receives DC input power provided by the DC-DC converter 118.
  • the DC-DC converter is configured to receive DC power from an external solar power system having a voltage between 16 volts and 21 volts and to provide output DC power of 14.8 volts to the charge controller 116. In other embodiments, other voltages may be used to accommodate operation with other solar power systems.
  • both mode switch 112 and mode switch 110 are configured to couple the output of the battery to the input of the LED driver.
  • the lighting system is configured to operate with a battery having an output voltage of 11.5 volts to 13.5 volts, but in other embodiments, other battery voltages may be used.
  • the lighting system is configured to operate with an external battery to accommodate larger, higher capacity batteries, however, in other embodiments; an internal battery may be used in addition to an external battery or in place of the external battery.
  • the detection circuit 108 detects the present of AC and solar power, and in one embodiment, controls the charge controller 116 to select operation from the solar power source when both AC power and solar power is available to operate the lighting system 100 in a more economical manner.
  • the detection circuit 108 also provides a signal to the dual power output control circuit 104 to control the circuit for high power operation if either AC power or solar power is available. If neither AC power nor solar power is available, then the detection circuit 108 controls the dual power output control circuit to operate in low power mode. Operation of the lighting system at low power in battery mode of operation allows the battery to operate for a longer period of time.
  • the dual power output control circuit 104 is implemented using parallel resistors in series with the LED array, and a switch (such as a transistor) is used to alter the value of the resistance in series with the LED array to limit the drive current to the LED array.
  • a switch such as a transistor
  • the total current through the LED array is 580mA in high power mode of operation and is reduced to 500mA in low power mode of operation.
  • other values of drive current may be used in other embodiments.
  • the LED array 102 is implemented using a 3 x 30 array of closely spaced LEDs as shown in FIG. 2.
  • the 3 rows are spaced 6.985 mm with the LEDs of each row spaced at 8.6mm intervals, and with each LED having a 5 mm diameter.
  • the LEDs have a forward voltage of 3.0 to 3.5 volts, a peak forward current of 20 mA, a reverse voltage of 5 volts, reverse current of 10 microamps, a luminous intensity of 1500 - 2000 mod, and are white with a wavelength of 5800K.
  • LRDs having different characteristics may be used.
  • a green LED, a red LED and a yellow LED are also provided, and in this embodiment, illumination of the green LED indicates that the power from the grid supply or the solar panel is available and is charging the battery, illumination of the yellow LED indicates that the battery is FULL, and illumination of the red LED indicates that the battery is drained and load is cut off from the battery.
  • mode switch 110 is a pull cord switch that may be used by a user to power the lighting system 100 on and off. As shown in FIG 1 , in one embodiment , the pull cord switch is connected between charge controller 116 output , internal switch 112 and LED driver 116 .
  • the internal switch 112 is a controllable switch, such as a diode.
  • the switch may be controlled by forward biasing or reverse biasing the diode.
  • the diode is reverse biased when the power is available either from SMPS 120 and/or DC -DC converter 118 thereby disconnecting the driver 106 from the battery 122.
  • the diode is forward biased when the power is not available either from SMPS 120 and/or DC -DC converter 118 and the lighting system 100 is powered from the battery 122.
  • switch 112 is controlled to be in the open position if solar or AC power is available, and if neither is available, the switch 112 is closed to couple the battery 122 to the LED driver.
  • the battery monitoring circuit 114 is coupled to output of battery 122 and LED driver 106. This circuit monitors remaining charge of the battery and gives a signal to the driver 106 to cut off the power supply to LED array 102 when the battery drains to 50 % of its full charge level. In other embodiment the battery may be drained to 80% of its full charge level.
  • the RED indication LED is ON, when the battery drains to 50% of its full charge capacity and the pull switch 110 is ON position.
  • FIG. 3 shows an exploded view of an LED light assembly 200 in accordance with one embodiment
  • FIGS. 4 and 5 show perspective views of the LED light assembly 200.
  • the components of the functional block diagram of the lighting system 100 are contained within the LED light assembly 200, except that the AC power source, the solar power source and the battery are all external to the LED light assembly and are not shown in FIG. 3.
  • the light assembly 200 includes a front cover 202, a case 204, an LED strip 206, a switch mode power supply board 208, an LED driver board 210, a solar board 211, a back cover 212, a solar power input terminal 214, a battery power input terminal 215, and an AC power input terminal 216.
  • the LED light assembly also includes the pull switch 218 and the three LED indicator lights 219. In one embodiment, the LED light assembly 200 is fastened together using screws 217 as shown in FIG. 3.
  • the LED light assembly 200 is a modular, upgradeable assembly, having several versions, and the specific electronics contained in the assembly can be varied based on the particular version of the assembly. More specifically, the SMPS board and the solar board may be removed or upgraded to change the version of the LED light assembly. To easily accommodate changing the SMPS board and the solar board, connection between the boards is accomplished in one embodiment using flexible cables between the boards with terminal block connectors coupling the cables to the boards. As shown in FIG. 3, the LED driver board, the solar board and the SMPS board are mounted to the back cover 212.
  • the LED strip in one embodiment contains the LED array 102 mounted on a printed circuit board with the board electrically coupled to the LED driver board 210. When assembled, the LED is mounted to the front of the case 204.
  • the case 204 and the back cover 212 in one embodiment are made form plastic (ABS).
  • the front cover 202 is made from transparent plastic ( PMMA 876G). In other embodiments, other plastic material can be used for the front cover 202, the case 204 and the back cover 212
  • FIG. 4 the front cover is shown in an operational, closed position, while in FIG. 5, the front cover is shown in an open position that allows cleaning of any dust buildup on the front cover.
  • the input terminal 214 provides for connection to a solar power source
  • the input terminal 215 provides for connection to a battery
  • input terminal 216 provides for connection to an AC source.
  • the light assembly is configured for horizontal mounting of the back cover to the wall of a room.
  • the LED strip is configured such that the printed circuit board is mounted at a 15 degree angle, shown as reference number 231, to the wall as shown in FIG. 6.
  • the LED light assembly 200 is mounted to a wall 230 of a room. It has been found that mounting the LED light assembly 200 with an LED array 102 having LEDs with the characteristics described above at a height of approximately eight feet from the floor of a room provides sufficient light for residential use for a 12 foot by 12 foot room. In larger rooms, multiple light assemblies may be used, and light assemblies having LED arrays at different mounting angles and mounting heights may be used.
  • the LED light assembly 200 can be modular and easily configured between four different versions.
  • the modularity allows cost- efficient operation that effectively matches the LED light assembly to a user based on power available to the user, allowing a user to purchase only the electronic circuitry needed to match the power sources available.
  • four different versions are provided.
  • the four versions include: (1) LED lamp powered by battery only; (2) LED lamp powered by AC supply with a battery backup; (3) LED lamp powered by solar panel with a battery backup; (4) LED lamp powered by AC supply or solar panel with a battery backup.
  • Version 1 is considered the most basic version and with additional circuitry added, version 1 can be upgraded to either version 2 or version 3.
  • Each of versions 2 and 3 is considered an intermediate version, and each of these can be upgraded to version 4 which is considered an advanced version.
  • the functional block diagram shown in FIG. 1 above is representative of version 4, the advanced version in accordance with one embodiment.
  • the basic version 300 includes the array of LEDs 102, the LED driver circuitry 106, the battery monitoring and control circuitry 114, and the battery 122.
  • the battery 122 may be an internal battery or a larger external battery to provide additional capacity.
  • the basic version also includes the detection circuit 108 and the dual power circuit 104 of FIG. 1.
  • the basic version can be upgraded to either the intermediate version (2) 302 or the intermediate version (3) 304 by adding respectively additional functional module 308 or 310.
  • Functional module 308 includes the charge controller 116 , the SMPS 120 and an AC supply 126.
  • Functional module 310 includes the charge controller 116, the DC-DC converter 118 and the solar power source 124.
  • the AC source is not included in the LED light assembly, but rather a connection for an AC source is added, and similarly, solar panels and associated devices are not added to the LED light assembly, but rather a connection to a source of solar power is added.
  • either of the intermediate versions may be upgraded to the advanced version by adding the functionality provided by either functional module 312 or functional module 314.
  • Functional module 312 includes the DC-DC converter 118 and the solar power source 124.
  • Functional module 314 includes the SMPS 120 and the AC supply 126.
  • the charge controller 116 is not included in the basic version, but is included in bom intermediate versions. In another embodiment, the charge controller 116 is a part of the basic version, and accordingly, is not included in the modules added to the basic version to create the intermediate versions.
  • the LED light assembly 200 can be configured in the basic version with the driver board included in the housing, and both the SMPS board and the solar board removed from the housing. The light assembly 200 is upgraded to version (2) by adding the SMPS board in the housing. The light assembly can then be upgraded from version (2) to version (4) by adding the solar board inside the housing. Version (3) is achieved by adding the solar board to version (1), and version (3) can be upgraded to version (4) with the addition of the SMPS board.
  • the ability to upgrade the LED light assembly 200 allows a user to purchase an affordable light assembly to meet current needs and to upgrade the light assembly 200 as additional power sources become available.
  • the modularity also simplifies manufacturing by allowing a single upgradeable assembly to be configured in four different versions, rather than providing four separate assemblies.
  • Embodiments of light assemblies described above use LEDs as a source of light. In other embodiments, fluorescent bulbs, incandescent bulbs and other light sources may be used in place of the LEDs.
  • light assemblies may be configured for operation with other power sources as well, including fuel cells and wind power.
  • references to embodiments or elements or acts of the systems and methods herein referred to in the singular may also embrace embodiments including a plurality of these elements, and any references in plural to any embodiment or element or act herein may also embrace embodiments including only a single element. References in the singular or plural form are not intended to limit the presently disclosed systems or methods, their components, acts, or elements to single or plural configurations.
  • references to "or” may be construed as inclusive so that any terms described using “or” may indicate any of a single, more than one, and all of the described terms.

Abstract

Methods and systems described herein provide efficient lighting for use particularly in areas having unreliable and or prohibitively expensive electric grid systems. A first aspect of the invention is directed to a light assembly that includes a first input to receive input power from a first power source, a second input to receive input power from a second power source, a third input to receive input power from a third power source, a driver circuit coupled to the first input, second input and the third input, and a light source coupled to the driver circuit and configured to provide output light in response to power provided by the driver circuit. The driver circuit is configured to detect unavailability of at least one of the first power source and die second power source, and in response, operate the light source in a low power, low light intensity mode of operation using power provided at the third input. Another aspect is directed to an upgradeable modular lighting system that is adaptable for use with a variety of power systems.

Description

LIGHTING SYSTEM AND METHOD
BACKGROUND
Field of the Invention
At least one embodiment in accordance with the present invention relates generally to modular lighting systems and mediods and more particularly to a dual power output, multiple input source, efficient lighting system. Discussion of Related Art
Solar, battery and electric grid lighting systems are well known, including those that use incandescent bulbs, fluorescent bulbs, and light emitting diodes (LEDs) as light sources. In underdeveloped and/or developing countries and in rural areas, the availability of reliable electric grid power systems remains spotty at best and alternate source systems can be expensive to install and operate and are not always compatible with available lighting sources. Further, alternate source lighting systems often do not provide sufficient room level lighting. As an alternative to electrical lighting in these areas, kerosene lamps are often used, and while these can reliably provide continuous light, they can be dangerous to use, cause health problems, and contribute to increases in CO2.
SUMMARY OF THE INVENTION
At least one embodiment discussed herein is directed to an efficient lighting system for use particularly in areas having unreliable and or prohibitively expensive electric grid systems.
A first aspect of the invention is directed to a light assembly that includes a first input to receive input power from a first power source, a second input to receive input power from a second power source, a third input to receive input power from a third power source, a driver circuit coupled to the first input, the second input and the third input, and a light source coupled to the driver circuit and configured to provide output light in response to power provided by the driver circuit. The driver circuit is configured to detect unavailability of at least one of the first power source and the second power source, and in response, operate the light source in a low power, low light intensity mode of operation using power provided at the third input. In the light assembly, the driver circuit may be configured to detect availability of at least one of the first power source and the second power source, and in response, operate the light source in a high power, high intensity mode of operation using power provided at one of the first input and the second input. The first input may be configured to receive input AC power, and the second input may be configured to receive power from a solar power system, and the driver circuit may be configured to detect availability of both AC power and solar power, and in response, operate the light source in the high power, high intensity mode of operation using the solar power. The third input may be configured to receive power from a battery, and the light assembly may further include circuitry to charge the battery using power provided at one of the first input and the second input. The light assembly may further include at least one indicator light coupled to the third input and configured to provide an indication of operation of the light assembly from battery and to provide an indication of remaining on time in battery mode of operation.
Another aspect of the invention is directed to a method of illuminating a room. The method includes providing a light source, coupling the light source to a first power source, operating the light source in a high power mode of operation from the first power source, detecting failure of the first power source, and in response to the detection of failure, operating the light source in a low power mode of operation from a battery.
In the method, the first power source may include an LED array, and operating the light source in the high power mode may include providing electrical current to the LED array having a first magnitude, and operating the light source in the low power mode may include providing electrical current to the LED array having a second magnitude less than the first magnitude. The method may further include detecting operation in the low power mode, and providing an indication of operation in the low power mode and an indication of remaining on time in low power mode. In the method, the light source may have a first input to receive input power from an AC power source, and a second input to receive input power from a solar power source, and the method may further include detecting available power from both the AC power source and the solar power source, and in response, operating the light source using power from the solar power source.
Another aspect of the invention is directed to a light assembly that includes a housing having at least one input to receive input power; a light source mounted to the housing; a first circuit module contained in the housing and coupled to the light source and the input and configured to provide power to the light source to provide output light from the light source, the first circuit module being configured to receive DC input power from the at least one input, a second removable circuit module removably mounted in the housing and configured to receive AC power at a second input and provide DC power to the first circuit module, and a third removable circuit module removably mounted in the housing and configured to receive at a third input DC power having a first voltage and to provide DC power to the first circuit module having a second voltage.
In the light assembly, the light source may include an LED array, and the light assembly may further include a first cable to couple the first circuit module to the second removable circuit module and a second cable to couple the first circuit module to the third removable circuit module. The light assembly may further include a plurality of indicator
LEDs coupled to the first circuit module and configured to provide an indication of remaining battery time, and the first circuit module may be configured to detect loss of AC power at the second input or loss of DC power at the third input, and in response, operate the light source in a low power mode of operation.
Yet another aspect of the invention is directed to a method of configuring and operating a light assembly. The method includes providing a light assembly having a housing, a light source mounted to the housing, and a first circuit module contained in the housing, the first circuit module being configured to provide power to the light source from a first DC power source at a first input, coupling a battery to the first input and operating the light assembly using power from the battery, providing a second circuit module, the second circuit module having a second input to receive input power and having an output to provide DC power to the first circuit module to power the light source from power provided at the second input, installing the second circuit module in the housing, and coupling a second power source to the second input and operating the light assembly from power provided by the second power source.
The method may further include providing a third circuit module, the third circuit module having a third input to receive input power and having an output to provide DC power to the first circuit module to power the light source from power provided at the third input, installing the third circuit module in the housing, and coupling a third power source to the third input and operating the light assembly from power provided by the third power source. In the method, the second power source may be an AC power source, and the second circuit module may include an AC to DC converter, and the third power source may be a solar power source, and the third circuit module may include a DC to DC converter. The method may further include detecting presence of both the AC power source and the solar power source, and in response, operating the light source in a high power mode from power from the solar power source. The method may also include detecting loss of at least one of the AC power source and the solar power source, and in response, operating the light source from the battery in a low power mode, having a power draw less than that of the high power mode. In the method, the light source may include an array of LEDs.
BRIEF DESCRIPTION OF DRAWINGS
The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component that is illustrated in various figures is represented by a like numeral. For purposes of clarity, not every component may be labeled in every drawing. In the drawings:
FIG. 1 shows a functional block diagram of a lighting system in accordance with one embodiment;
FIG. 2 shows an LED array used in the embodiment of FIG. 1 ;
FIG. 3 shows an exploded view of a lighting assembly in accordance with one embodiment;
FIG. 4 shows a first perspective view of the lighting assembly of FIG. 3;
FIG. 5 shows a second perspective view of the lighting assembly of FIG. 3.
FIG. 6 shows a lighting assembly in accordance with one embodiment mounted on the wall of a room;
FIG. 7 shows a functional block diagram of an upgradeable lighting assembly in accordance with one embodiment; and
FIG. 8 shows a functional block diagram of an upgradeable lighting assembly in accordance with one embodiment.
DETAILED DESCRIPTION
The systems and methods described herein are not limited in their application to the details of construction and the arrangement of components set forth in the description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including" "comprising" "having" "containing" "involving" and variations thereof herein, is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.
At least some embodiments disclosed herein are directed to modular, efficient lighting systems and methods, including LED lighting systems, operable from DC power sources including battery power sources, fuel cells, and solar power, and AC power sources including a utility electrical grid, generator or other AC power source. Specific embodiments are designed in a modular configuration, such that one or more modules may be replaced or added to a lighting system to provide connection to a different type of power source. At least some embodiments are directed to LED lighting systems having LEDs arranged to provide full room lighting from a compact wall-mountable unit, and are configurable for dual power mode operation to allow low power operation on battery power.
FIG. 1 is directed to a functional block diagram of a modular LED lighting system 100 in accordance with one embodiment. The lighting system 100 includes an array of LEDs 102, a dual power output control circuit 104, an LED driver circuit 106, a detection circuit 108, mode switches 110 and 112, a battery monitoring circuit 114, a charge control circuit 116, a DC-DC converter 118, a switch mode power supply (SMPS) 120, A battery 122, a solar power source 124, and an AC power source 126. In different embodiments, functional circuits may be grouped differently than shown in FIG. 1.
The LED array 102 is coupled between the dual power output control circuit 104 and the LED driver 106. Mode switches 110 and 112 are coupled between the LED driver circuit 106 and the battery 122, and the mode switches are also coupled to an output of the charge controller 116. The DC-DC converter 118 is coupled between the solar power source 124 and the charge controller 116. The SMPS 120 is coupled between the AC power source and the charge controller 116. The battery 122 is coupled to the charge controller 116, mode switch 112 and the battery monitoring circuit 114. The detection circuit 108 is coupled to the SMPS 120 output, DC -DC converter 118 output and the dual power output control circuit 104.
In operation, light is provided by the LED array from power provided from one of the AC power source 126, the solar power source 124 and the battery 122. When operated from the AC power source, the SMPS receives the input AC power and converts the AC power to DC power. In one embodiment, the input AC voltage is 230 volts at 50 Hz, although in other embodiments, other input voltages at other frequencies may also be used. In one embodiment, the output of the SMPS is 14.38 volts, but other output voltages may also be used.
The charge controller 116 receives the voltage from the SMPS and provides an output voltage to the mode switches 110 and 112. The charge controller also provides a charging voltage for the battery 122 (if a battery is included in the system). In AC mode of operation (and in solar mode of operation), mode switch 112 is open to isolate the battery, while mode switch 110 is configured to couple the output of the charge controller to the LED driver. The LED driver circuit receives the output voltage of the charge controller 116 and provides an output constant current for the LED array 102 to light the LEDs.
The dual power output control circuit 104 is used to provide a low power mode of operation of the lighting system 100 when operated from battery power. In the AC and solar modes of operation, the dual power output control circuit is controlled to operate in normal, high power mode of operation.
Operation in solar mode is the same as in AC mode except that the charge controller 116 receives DC input power provided by the DC-DC converter 118. In one embodiment, the DC-DC converter is configured to receive DC power from an external solar power system having a voltage between 16 volts and 21 volts and to provide output DC power of 14.8 volts to the charge controller 116. In other embodiments, other voltages may be used to accommodate operation with other solar power systems.
In battery mode of operation, DC power is provided from the battery 122 to the internal switch 112, and both mode switch 112 and mode switch 110 are configured to couple the output of the battery to the input of the LED driver. In one embodiment, the lighting system is configured to operate with a battery having an output voltage of 11.5 volts to 13.5 volts, but in other embodiments, other battery voltages may be used. In at least one embodiment, the lighting system is configured to operate with an external battery to accommodate larger, higher capacity batteries, however, in other embodiments; an internal battery may be used in addition to an external battery or in place of the external battery.
The detection circuit 108, detects the present of AC and solar power, and in one embodiment, controls the charge controller 116 to select operation from the solar power source when both AC power and solar power is available to operate the lighting system 100 in a more economical manner. The detection circuit 108 also provides a signal to the dual power output control circuit 104 to control the circuit for high power operation if either AC power or solar power is available. If neither AC power nor solar power is available, then the detection circuit 108 controls the dual power output control circuit to operate in low power mode. Operation of the lighting system at low power in battery mode of operation allows the battery to operate for a longer period of time. In one embodiment, the dual power output control circuit 104 is implemented using parallel resistors in series with the LED array, and a switch (such as a transistor) is used to alter the value of the resistance in series with the LED array to limit the drive current to the LED array. In one embodiment, the total current through the LED array is 580mA in high power mode of operation and is reduced to 500mA in low power mode of operation. However, depending on the number and type of LEDs used in the array, other values of drive current may be used in other embodiments.
In one embodiment, the LED array 102 is implemented using a 3 x 30 array of closely spaced LEDs as shown in FIG. 2. In one embodiment, the 3 rows are spaced 6.985 mm with the LEDs of each row spaced at 8.6mm intervals, and with each LED having a 5 mm diameter. In on embodiment, the LEDs have a forward voltage of 3.0 to 3.5 volts, a peak forward current of 20 mA, a reverse voltage of 5 volts, reverse current of 10 microamps, a luminous intensity of 1500 - 2000 mod, and are white with a wavelength of 5800K. In other embodiments, LRDs having different characteristics may be used. In one embodiment, a green LED, a red LED and a yellow LED are also provided, and in this embodiment, illumination of the green LED indicates that the power from the grid supply or the solar panel is available and is charging the battery, illumination of the yellow LED indicates that the battery is FULL, and illumination of the red LED indicates that the battery is drained and load is cut off from the battery.
As shown in FTG. 1, mode switch 110 is a pull cord switch that may be used by a user to power the lighting system 100 on and off. As shown in FIG 1 , in one embodiment , the pull cord switch is connected between charge controller 116 output , internal switch 112 and LED driver 116 .
In one embodiment, the internal switch 112 is a controllable switch, such as a diode. The switch may be controlled by forward biasing or reverse biasing the diode. The diode is reverse biased when the power is available either from SMPS 120 and/or DC -DC converter 118 thereby disconnecting the driver 106 from the battery 122. The diode is forward biased when the power is not available either from SMPS 120 and/or DC -DC converter 118 and the lighting system 100 is powered from the battery 122. In one embodiment, switch 112 is controlled to be in the open position if solar or AC power is available, and if neither is available, the switch 112 is closed to couple the battery 122 to the LED driver. In one embodiment, the battery monitoring circuit 114 is coupled to output of battery 122 and LED driver 106. This circuit monitors remaining charge of the battery and gives a signal to the driver 106 to cut off the power supply to LED array 102 when the battery drains to 50 % of its full charge level. In other embodiment the battery may be drained to 80% of its full charge level. The RED indication LED is ON, when the battery drains to 50% of its full charge capacity and the pull switch 110 is ON position.
FIG. 3 shows an exploded view of an LED light assembly 200 in accordance with one embodiment, while FIGS. 4 and 5 show perspective views of the LED light assembly 200. The components of the functional block diagram of the lighting system 100 are contained within the LED light assembly 200, except that the AC power source, the solar power source and the battery are all external to the LED light assembly and are not shown in FIG. 3. The light assembly 200 includes a front cover 202, a case 204, an LED strip 206, a switch mode power supply board 208, an LED driver board 210, a solar board 211, a back cover 212, a solar power input terminal 214, a battery power input terminal 215, and an AC power input terminal 216. The LED light assembly also includes the pull switch 218 and the three LED indicator lights 219. In one embodiment, the LED light assembly 200 is fastened together using screws 217 as shown in FIG. 3.
As discussed in more detail below, in at least some embodiments, the LED light assembly 200 is a modular, upgradeable assembly, having several versions, and the specific electronics contained in the assembly can be varied based on the particular version of the assembly. More specifically, the SMPS board and the solar board may be removed or upgraded to change the version of the LED light assembly. To easily accommodate changing the SMPS board and the solar board, connection between the boards is accomplished in one embodiment using flexible cables between the boards with terminal block connectors coupling the cables to the boards. As shown in FIG. 3, the LED driver board, the solar board and the SMPS board are mounted to the back cover 212.
The LED strip in one embodiment contains the LED array 102 mounted on a printed circuit board with the board electrically coupled to the LED driver board 210. When assembled, the LED is mounted to the front of the case 204.
The case 204 and the back cover 212 in one embodiment are made form plastic (ABS
Abstron IM 17A) while the front cover 202 is made from transparent plastic ( PMMA 876G). In other embodiments, other plastic material can be used for the front cover 202, the case 204 and the back cover 212 In FIG. 4, the front cover is shown in an operational, closed position, while in FIG. 5, the front cover is shown in an open position that allows cleaning of any dust buildup on the front cover.
The input terminal 214 provides for connection to a solar power source, the input terminal 215 provides for connection to a battery, and input terminal 216 provides for connection to an AC source.
In one embodiment, the light assembly is configured for horizontal mounting of the back cover to the wall of a room. In this embodiment, the LED strip is configured such that the printed circuit board is mounted at a 15 degree angle, shown as reference number 231, to the wall as shown in FIG. 6. In FIG. 6, the LED light assembly 200 is mounted to a wall 230 of a room. It has been found that mounting the LED light assembly 200 with an LED array 102 having LEDs with the characteristics described above at a height of approximately eight feet from the floor of a room provides sufficient light for residential use for a 12 foot by 12 foot room. In larger rooms, multiple light assemblies may be used, and light assemblies having LED arrays at different mounting angles and mounting heights may be used.
As briefly discussed above, in one embodiment, the LED light assembly 200 can be modular and easily configured between four different versions. The modularity allows cost- efficient operation that effectively matches the LED light assembly to a user based on power available to the user, allowing a user to purchase only the electronic circuitry needed to match the power sources available. In one embodiment, four different versions are provided. The four versions include: (1) LED lamp powered by battery only; (2) LED lamp powered by AC supply with a battery backup; (3) LED lamp powered by solar panel with a battery backup; (4) LED lamp powered by AC supply or solar panel with a battery backup. Version 1 is considered the most basic version and with additional circuitry added, version 1 can be upgraded to either version 2 or version 3. Each of versions 2 and 3 is considered an intermediate version, and each of these can be upgraded to version 4 which is considered an advanced version. The functional block diagram shown in FIG. 1 above is representative of version 4, the advanced version in accordance with one embodiment.
Functional block diagrams of the different versions of the LED light assembly 200 are shown in FIGS. 7 and 8, along with representations of the differences between the versions. Reference numerals used for the functional circuit blocks in the functional block diagrams of FIGS. 7 and 8 are the same as those used in FIG. 1 above. The basic version 300 includes the array of LEDs 102, the LED driver circuitry 106, the battery monitoring and control circuitry 114, and the battery 122. The battery 122 may be an internal battery or a larger external battery to provide additional capacity. In one embodiment, the basic version also includes the detection circuit 108 and the dual power circuit 104 of FIG. 1.
As illustrated in FIG. 7, the basic version can be upgraded to either the intermediate version (2) 302 or the intermediate version (3) 304 by adding respectively additional functional module 308 or 310. Functional module 308 includes the charge controller 116 , the SMPS 120 and an AC supply 126. Functional module 310 includes the charge controller 116, the DC-DC converter 118 and the solar power source 124. In embodiments of the invention, the AC source is not included in the LED light assembly, but rather a connection for an AC source is added, and similarly, solar panels and associated devices are not added to the LED light assembly, but rather a connection to a source of solar power is added.
As illustrated in FIG. 8, either of the intermediate versions may be upgraded to the advanced version by adding the functionality provided by either functional module 312 or functional module 314. Functional module 312 includes the DC-DC converter 118 and the solar power source 124. Functional module 314 includes the SMPS 120 and the AC supply 126.
In the modular embodiment described above, the charge controller 116 is not included in the basic version, but is included in bom intermediate versions. In another embodiment, the charge controller 116 is a part of the basic version, and accordingly, is not included in the modules added to the basic version to create the intermediate versions. In this embodiment, with reference to FIG. 2, the LED light assembly 200 can be configured in the basic version with the driver board included in the housing, and both the SMPS board and the solar board removed from the housing. The light assembly 200 is upgraded to version (2) by adding the SMPS board in the housing. The light assembly can then be upgraded from version (2) to version (4) by adding the solar board inside the housing. Version (3) is achieved by adding the solar board to version (1), and version (3) can be upgraded to version (4) with the addition of the SMPS board.
The ability to upgrade the LED light assembly 200 allows a user to purchase an affordable light assembly to meet current needs and to upgrade the light assembly 200 as additional power sources become available. The modularity also simplifies manufacturing by allowing a single upgradeable assembly to be configured in four different versions, rather than providing four separate assemblies. Embodiments of light assemblies described above use LEDs as a source of light. In other embodiments, fluorescent bulbs, incandescent bulbs and other light sources may be used in place of the LEDs.
In embodiments described above, three primary sources of power are discussed, AC grid, battery and solar. In other embodiments, light assemblies may be configured for operation with other power sources as well, including fuel cells and wind power.
Any references above to front and back, left and right, top and bottom, or upper and lower and the like are intended for convenience of description, not to limit the present systems and methods or their components to any one positional or spatial orientation.
Any references to embodiments or elements or acts of the systems and methods herein referred to in the singular may also embrace embodiments including a plurality of these elements, and any references in plural to any embodiment or element or act herein may also embrace embodiments including only a single element. References in the singular or plural form are not intended to limit the presently disclosed systems or methods, their components, acts, or elements to single or plural configurations.
Any embodiment disclosed herein may be combined with any other embodiment, and references to "an embodiment," "some embodiments," "an alternate embodiment," "various embodiments," "one embodiment" or the like are not necessarily mutually exclusive and are intended to indicate that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment. Such terms as used herein are not necessarily all referring to the same embodiment. Any embodiment may be combined with any other embodiment in any manner consistent with the aspects and embodiments disclosed herein.
References to "or" may be construed as inclusive so that any terms described using "or" may indicate any of a single, more than one, and all of the described terms.
Where technical features in the drawings, detailed description or any claim are followed by references signs, the reference signs have been included for the sole purpose of increasing the intelligibility of the drawings, detailed description, and claims. Accordingly, neither the reference signs nor their absence have any limiting effect on the scope of any claim elements.
Having thus described several aspects of at least one embodiment of this invention, it is to be appreciated various alterations, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to be part of this disclosure, and are intended to be within the spirit and scope of the invention. Accordingly, the foregoing description and drawings are by way of example only.

Claims

1. A light assembly comprising:
a first input to receive input power from a first power source;
a second input to receive input power from a second power source;
a third input to receive input power from a third power source;
a driver circuit coupled to the first input, the second input and the third input, and a light source coupled to the driver circuit and configured to provide output light in response to power provided by the driver circuit;
wherein the driver circuit is configured to detect unavailability of at least one of the first power source and the second power source, and in response, operate the light source in a low power, low light intensity mode of operation using power provided at the third input.
2. The light assembly of claim 1, wherein the driver circuit is configured to detect availability of at least one of the first power source and the second power source, and in response, operate the light source in a high power, high intensity mode of operation using power provided at one of the first input and the second input.
3. The light assembly of claim 2, wherein the first input is configured to receive input AC power, and the second input is configured to receive power from a solar power system, and wherein the driver circuit is configured to detect availability of both AC power and solar power, and in response, operate the light source in the high power, high intensity mode of operation using the solar power.
4. The light assembly of claim 3, wherein the third input is configured to receive power from a battery, and wherein the light assembly further includes circuitry to charge the battery using power provided at one of the first input and the second input.
5. The light assembly of claim 4, further comprising at least one indicator light coupled to the third input and configured to provide an indication of operation of the light assembly from battery and to provide an indication of remaining on time in battery mode of operation.
6. A method of illuminating a room comprising:
providing a light source;
coupling the light source to a first power source;
operating the light source in a high power mode of operation from the first power source;
detecting failure of the first power source;
in response to the detection of failure, operating the light source in a low power mode of operation from a battery.
7. The method of claim 6, wherein the first power source includes an LED array, and wherein operating the light source in the high power mode includes providing electrical current to the LED array having a first magnitude, and wherein operating the light source in the low power mode includes providing electrical current to the LED array having a second magnitude less than the first magnitude.
8. The method of claim 7, further comprising detecting operation in the low power mode, and providing an indication of operation in the low power mode and an indication of remaining on time in low power mode.
9. The method of claim 6, wherein the light source has a first input to receive input power from an AC power source, and a second input to receive input power from a solar power source, and wherein the method further includes detecting available power from both the AC power source and the solar power source, and in response, operating the light source using power from the solar power source.
10. A light assembly comprising:
a housing having at least one input to receive input power;
a light source mounted to the housing;
a first circuit module contained in the housing and coupled to the light source and the input and configured to provide power to the light source to provide output light from the light source, the first circuit module being configured to receive DC input power from the at least one input; a second removable circuit module removably mounted in the housing and configured to receive AC power at a second input and provide DC power to the first circuit module; a third removable circuit module removably mounted in the housing and configured to receive at a third input DC power having a first voltage and to provide DC power to the first circuit module having a second voltage.
11. The light assembly of claim 10, wherein the light source includes an LED array.
12. The light assembly of claim 11, further comprising a first cable to couple the first circuit module to the second removable circuit module.
13. The light assembly of claim 12, further comprising a second cable to couple the first circuit module to the third removable circuit module.
14. The light assembly of claim 10, further comprising a plurality of indicator LEDs coupled to the first circuit module and configured to provide an indication of remaining battery time.
15. The light assembly of claim 10, wherein the first circuit module is configured to detect loss of AC power at the second input or loss of DC power at the third input, and in response, operate the light source in a low power mode of operation.
16. A method of configuring and operating a light assembly comprising:
providing a light assembly having a housing, a light source mounted to the housing, and a first circuit module contained in the housing, the first circuit module being configured to provide power to die light source from a first DC power source at a first input;
coupling a battery to the first input and operating die light assembly using power from die battery;
providing a second circuit module, die second circuit module having a second input to receive input power and having an output to provide DC power to die first circuit module to power the light source from power provided at the second input;
installing die second circuit module in the housing; and coupling a second power source to the second input and operating the light assembly from power provided by the second power source.
17. The method of claim 16, further comprising:
providing a third circuit module , the third circuit module having a third input to receive input power and having an output to provide DC power to the first circuit module to power the light source from power provided at the third input;
installing the third circuit module in the housing; and
coupling a third power source to the third input and operating the light assembly from power provided by the third power source.
18. The method of claim 17, wherein the second power source is an AC power source, and the second circuit module includes an AC to DC converter.
19. The method of claim 18, wherein the third power source is a solar power source, and the third circuit module includes a DC to DC converter.
20. The method of claim 17, wherein the second power source is a solar power source, and the second circuit module includes a DC to DC converter.
21. The method of claim 20, wherein the third power source is an AC power source, and the third circuit module includes an AC to DC converter.
22. The method of claim 21, further comprising detecting presence of both the AC power source and the solar power source, and in response, operating the light source in a high power mode from power from the solar power source.
23. The method of claim 22, further comprising detecting loss of at least one of the AC power source and the solar power source, and in response, operating the light source from the battery in a low power mode, having a power draw less than that of the high power mode.
24. The method of claim 17, wherein providing the light assembly includes providing a light assembly having a light source that includes an array of LEDs.
PCT/IB2010/002100 2009-08-28 2010-08-23 Lighting system and method WO2011024062A2 (en)

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CN102577619A (en) 2012-07-11
RU2012106752A (en) 2013-10-10

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