US20010030526A1 - Method and mechanism to prevent corruption of data - Google Patents
Method and mechanism to prevent corruption of data Download PDFInfo
- Publication number
- US20010030526A1 US20010030526A1 US09/738,090 US73809000A US2001030526A1 US 20010030526 A1 US20010030526 A1 US 20010030526A1 US 73809000 A US73809000 A US 73809000A US 2001030526 A1 US2001030526 A1 US 2001030526A1
- Authority
- US
- United States
- Prior art keywords
- battery
- specific data
- charger
- node
- connection sensor
- Prior art date
- Legal status (The legal status 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 status listed.)
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Classifications
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00038—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors
- H02J7/00043—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors using switches, contacts or markings, e.g. optical, magnetic or barcode
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries
Definitions
- the present invention relates to electronic circuits and, more specifically, to electronic circuits employed in battery chargers.
- Many “smart” battery units include a battery and a device that gives information about the battery to such devices as battery chargers and other host devices that are powered by the battery (e.g., radios, telephones, etc.).
- One such device is a code resistor that identifies characteristics of the battery. The value of a code resistor may be determined by the battery charger, based on a current supplied to bias the code resistor and the voltage sensed across the code resistor.
- a smart battery unit might also include a battery monitor circuit that provides information to the host device during use.
- FIG. 1 is a block diagram of an exemplary embodiment of the invention.
- FIG. 2 is a schematic diagram of one specific embodiment of the invention.
- one embodiment of the invention is a data integrity circuit 130 for preventing corruption of battery-specific data transferred from a battery-specific data element 108 in a “smart” battery unit 100 .
- the smart battery unit 100 is capable of interfacing a battery 102 to a battery charger 110 and a load 120 (e.g., a radio or cell telephone).
- a load 120 e.g., a radio or cell telephone.
- the smart battery unit 100 includes a positive battery terminal node 112 , a negative battery terminal node 118 , a battery data node 114 and a charger connection sensor node 116 , also referred to herein as a pull-up node.
- the smart battery unit 100 includes a positive battery terminal node 122 , a negative battery terminal node 126 and a battery data node 124 .
- the battery-specific data element 108 which could include an element such as a code resistor 104 , a logic circuit 106 (e.g., an EEPROM or other device), or both, provides information to the battery charger 110 and the load 120 relating to the characteristics of the battery.
- the circuit 130 prevents corruption of battery-specific data from the battery-specific data element 108 that is transferred to the battery charger 110 when the battery 102 is electrically coupled to both the battery charger 110 and to a load 120 .
- the data integrity circuit 130 includes a charger connection sensor 132 and an interrupter circuit 134 .
- the charger connection sensor 132 is capable of sensing when the battery 102 is connected to the battery charger 110 .
- the interrupter circuit 134 is responsive to the charger connection sensor 132 .
- the interruptor circuit 134 electrically couples the battery-specific data element 108 to a load side battery-specific data node 124 (which is accessible by the load 120 ) when the charger connection sensor 132 indicates that the battery 102 is not connected to the battery charger 110 and electrically uncouples the battery-specific data element 108 to the battery-specific data node 124 when the charger connection sensor 132 indicates that the battery 102 is connected to the battery charger 110 .
- the battery charger includes a pull-up resistor 202 that electrically couples the pull-up node 216 to a reference voltage when the battery 202 is connected to the battery charger 210 .
- the charger connection sensor 232 which includes a first resistor 228 (such as a negative coefficient thermistor) electrically couples the pull-up node 216 to a ground.
- the pull-up node 216 will have a first voltage (which is relatively high) when the first resistor 228 is electrically coupled to the pull-up resistor 202 . Decoupling the first resistor 228 from the pull-up resistor 202 will cause the voltage of the pull up node 216 to drop substantially to ground.
- the pull-up node 216 is connected to the gate of a field effect transistor 235 , which acts as a control switching element.
- the field effect transistor 235 turns “off,” allowing the voltage of the battery 202 to be applied to the input of the interrupter circuit 234 through resistors 239 and 240 .
- the field effect transistor 235 turns “on” and couples the input of the interrupter circuit 234 to ground.
- the interrupter circuit 234 includes a first field effect transistor 236 and a second field effect transistor 238 .
- the first field effect transistor 236 has a first gate, which is electrically coupled to the output of the charger connection sensor 232 , a first source and a first drain, which is in series with the charger side battery data node 214 .
- a first parasitic diode exists between the first source and the first drain.
- the first field effect transistor 236 is biased so that parasitic current may flow though the first parasitic diode in only a first direction.
- the first field effect transistor 236 and the second field effect transistor 238 are biased so that current is allowed to flow between the charger side battery data node 214 and the load side battery data node 224 when field effect transistor 235 is turned “off.”
- the second field effect transistor 238 has a second gate, which is also electrically coupled to the output of the charger connection sensor 232 , a second source that is electrically coupled to the first source of the first field effect transistor 236 , and a second drain, which is electrically coupled to the load side battery data node 224 .
- transistors 236 and 238 have common sources, it will be readily understood that a circuit employing common drains, rather than common sources, could be constructed without departing from the scope of the invention.
- a second parasitic diode exists between the second source and the second drain. Therefore, the second field effect transistor 238 is biased so that parasitic current may flow through the second parasitic diode in only a second direction, which is different from the first direction.
- field effect transistors 236 and 238 are turned “off,” the first and second parasitic diodes are opposed to each other and no current flows between the code resistor 204 and the load side battery data node 224 .
- the second source is in series with the load side battery-specific data node 224 .
- transistor 235 When the voltage at node 216 is low (signifying disconnection from the battery charger 210 ), transistor 235 is in the “off” state, which causes the voltage at the gates of transistors 236 and 238 to go high, turning both of these transistors “on.” Transistor 241 also turns “off,” so that data from elements 206 and 208 can be transferred without interference from the code resistor 204 .
- transistor 235 When the voltage at node 216 is high (signifying connection to the battery charger 210 ), transistor 235 is in the “on” state, which causes the voltage at the gates of transistors 236 and 238 to be pulled down, turning both of these transistors “off.” Transistor 241 turns “on,” so that the resistance of the code resistor 204 may be sensed by the charger 210 .
Abstract
Description
- This application claims priority from U.S. Provisional Application Ser. No. 60/172,396, filed Dec. 17, 1999, the disclosures of which, including all attached documents and appendices, are incorporated by reference in their entirety for all purposes.
- The present invention relates to electronic circuits and, more specifically, to electronic circuits employed in battery chargers.
- Many “smart” battery units include a battery and a device that gives information about the battery to such devices as battery chargers and other host devices that are powered by the battery (e.g., radios, telephones, etc.). One such device is a code resistor that identifies characteristics of the battery. The value of a code resistor may be determined by the battery charger, based on a current supplied to bias the code resistor and the voltage sensed across the code resistor. A smart battery unit might also include a battery monitor circuit that provides information to the host device during use.
- Existing smart battery units allow the code resistor to be connected to the host device when the battery unit is also connected to a battery charger. Current to the code resistor could be supplied by both the battery charger and the host device. This results in a voltage across the code resistor being sensed by the battery charger that is different from the expected voltage for a given battery type. This can cause the battery charger to go off-line or to attempt to charge the battery in an incorrect manner.
- Therefore, there is a need for a circuit that isolates a code resistor in a battery unit from a load when the battery unit is also connected to a battery charger.
- FIG. 1 is a block diagram of an exemplary embodiment of the invention.
- FIG. 2 is a schematic diagram of one specific embodiment of the invention.
- A preferred embodiment of the invention is now described in detail. Referring to the drawings, like numbers indicate like parts throughout the views. As used in the description herein and throughout the claims, the following terms take the meanings explicitly associated herein, unless the context clearly dictates otherwise: the meaning of “a,” “an,” and “the” includes plural reference, the meaning of “in” includes “in” and “on.” Also, as used herein, “data” includes information conveyed by either or both a digital or an analog signal.
- As shown in FIG. 1, one embodiment of the invention is a
data integrity circuit 130 for preventing corruption of battery-specific data transferred from a battery-specific data element 108 in a “smart”battery unit 100. Thesmart battery unit 100 is capable of interfacing abattery 102 to abattery charger 110 and a load 120 (e.g., a radio or cell telephone). On the charger side thesmart battery unit 100 includes a positivebattery terminal node 112, a negativebattery terminal node 118, abattery data node 114 and a chargerconnection sensor node 116, also referred to herein as a pull-up node. On the load side, thesmart battery unit 100 includes a positivebattery terminal node 122, a negativebattery terminal node 126 and abattery data node 124. The battery-specific data element 108, which could include an element such as acode resistor 104, a logic circuit 106 (e.g., an EEPROM or other device), or both, provides information to thebattery charger 110 and theload 120 relating to the characteristics of the battery. - The
circuit 130 prevents corruption of battery-specific data from the battery-specific data element 108 that is transferred to thebattery charger 110 when thebattery 102 is electrically coupled to both thebattery charger 110 and to aload 120. Thedata integrity circuit 130 includes acharger connection sensor 132 and aninterrupter circuit 134. Thecharger connection sensor 132 is capable of sensing when thebattery 102 is connected to thebattery charger 110. Theinterrupter circuit 134 is responsive to thecharger connection sensor 132. Theinterruptor circuit 134 electrically couples the battery-specific data element 108 to a load side battery-specific data node 124 (which is accessible by the load 120) when thecharger connection sensor 132 indicates that thebattery 102 is not connected to thebattery charger 110 and electrically uncouples the battery-specific data element 108 to the battery-specific data node 124 when thecharger connection sensor 132 indicates that thebattery 102 is connected to thebattery charger 110. - One specific embodiment is shown in FIG. 2, the battery charger includes a pull-
up resistor 202 that electrically couples the pull-up node 216 to a reference voltage when thebattery 202 is connected to thebattery charger 210. Thecharger connection sensor 232, which includes a first resistor 228 (such as a negative coefficient thermistor) electrically couples the pull-upnode 216 to a ground. The pull-upnode 216 will have a first voltage (which is relatively high) when the first resistor 228 is electrically coupled to the pull-up resistor 202. Decoupling the first resistor 228 from the pull-up resistor 202 will cause the voltage of the pull upnode 216 to drop substantially to ground. The pull-up node 216 is connected to the gate of afield effect transistor 235, which acts as a control switching element. When the pull-up node 216 is electrically low, thefield effect transistor 235 turns “off,” allowing the voltage of thebattery 202 to be applied to the input of theinterrupter circuit 234 throughresistors up node 216 is high, thefield effect transistor 235 turns “on” and couples the input of theinterrupter circuit 234 to ground. - The
interrupter circuit 234 includes a firstfield effect transistor 236 and a secondfield effect transistor 238. The firstfield effect transistor 236 has a first gate, which is electrically coupled to the output of thecharger connection sensor 232, a first source and a first drain, which is in series with the charger sidebattery data node 214. A first parasitic diode exists between the first source and the first drain. The firstfield effect transistor 236 is biased so that parasitic current may flow though the first parasitic diode in only a first direction. The firstfield effect transistor 236 and the secondfield effect transistor 238 are biased so that current is allowed to flow between the charger sidebattery data node 214 and the load sidebattery data node 224 whenfield effect transistor 235 is turned “off.” Similarly, the secondfield effect transistor 238 has a second gate, which is also electrically coupled to the output of thecharger connection sensor 232, a second source that is electrically coupled to the first source of the firstfield effect transistor 236, and a second drain, which is electrically coupled to the load sidebattery data node 224. (While in the embodiment shown,transistors field effect transistor 238 is biased so that parasitic current may flow through the second parasitic diode in only a second direction, which is different from the first direction. Thus, whenfield effect transistors code resistor 204 and the load sidebattery data node 224. The second source is in series with the load side battery-specific data node 224. - When the voltage at
node 216 is low (signifying disconnection from the battery charger 210),transistor 235 is in the “off” state, which causes the voltage at the gates oftransistors Transistor 241 also turns “off,” so that data fromelements code resistor 204. When the voltage atnode 216 is high (signifying connection to the battery charger 210),transistor 235 is in the “on” state, which causes the voltage at the gates oftransistors Transistor 241 turns “on,” so that the resistance of thecode resistor 204 may be sensed by thecharger 210. - The above described embodiments are given as illustrative examples only. It will be readily appreciated that many deviations may be made from the specific embodiments disclosed in this specification without departing from the invention. Accordingly, the scope of the invention is to be determined by the claims below rather than being limited to the specifically described embodiments above.
Claims (5)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/738,090 US6316916B2 (en) | 1999-12-17 | 2000-12-15 | Method and mechanism to prevent corruption of data |
PCT/US2000/034332 WO2001045231A1 (en) | 1999-12-17 | 2000-12-18 | Method and mechanism to prevent corruption of data |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17239699P | 1999-12-17 | 1999-12-17 | |
US09/738,090 US6316916B2 (en) | 1999-12-17 | 2000-12-15 | Method and mechanism to prevent corruption of data |
Publications (2)
Publication Number | Publication Date |
---|---|
US20010030526A1 true US20010030526A1 (en) | 2001-10-18 |
US6316916B2 US6316916B2 (en) | 2001-11-13 |
Family
ID=26868042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US09/738,090 Expired - Lifetime US6316916B2 (en) | 1999-12-17 | 2000-12-15 | Method and mechanism to prevent corruption of data |
Country Status (2)
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US (1) | US6316916B2 (en) |
WO (1) | WO2001045231A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
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US20040212941A1 (en) * | 2003-04-22 | 2004-10-28 | Haas William Robert | Power sharing system and method for battery operated controller and application modules |
GB2447917A (en) * | 2007-03-27 | 2008-10-01 | Thorn Security | Using resistors in a fire detector to indicate the life span or manufacturing date of each sensor |
US20100201327A1 (en) * | 2007-06-25 | 2010-08-12 | Mitsumi Electric Co, Ltd | Battery pack |
US20150084783A1 (en) * | 2013-09-25 | 2015-03-26 | Cgg Services Sa | Geophysical survey node rolling method and system |
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US6995963B2 (en) * | 2001-10-22 | 2006-02-07 | Apple Computer, Inc. | Methods and apparatus for charging a battery in a peripheral device |
US7573159B1 (en) | 2001-10-22 | 2009-08-11 | Apple Inc. | Power adapters for powering and/or charging peripheral devices |
US6717520B1 (en) | 2002-09-19 | 2004-04-06 | Motorola Inc. | Method and apparatus for selectively providing an audible low power alert to a user of an electronic device |
US6928372B2 (en) * | 2003-07-29 | 2005-08-09 | Motorola, Inc. | Method for estimating time to full-charge in a rechargeable battery |
US7529870B1 (en) | 2004-04-27 | 2009-05-05 | Apple Inc. | Communication between an accessory and a media player with multiple lingoes |
US7441058B1 (en) | 2006-09-11 | 2008-10-21 | Apple Inc. | Method and system for controlling an accessory having a tuner |
US7441062B2 (en) | 2004-04-27 | 2008-10-21 | Apple Inc. | Connector interface system for enabling data communication with a multi-communication device |
US7526588B1 (en) | 2004-04-27 | 2009-04-28 | Apple Inc. | Communication between an accessory and a media player using a protocol with multiple lingoes |
US7529872B1 (en) | 2004-04-27 | 2009-05-05 | Apple Inc. | Communication between an accessory and a media player using a protocol with multiple lingoes |
US7797471B2 (en) | 2004-04-27 | 2010-09-14 | Apple Inc. | Method and system for transferring album artwork between a media player and an accessory |
US7895378B2 (en) | 2004-04-27 | 2011-02-22 | Apple Inc. | Method and system for allowing a media player to transfer digital audio to an accessory |
US7826318B2 (en) | 2004-04-27 | 2010-11-02 | Apple Inc. | Method and system for allowing a media player to transfer digital audio to an accessory |
US8117651B2 (en) | 2004-04-27 | 2012-02-14 | Apple Inc. | Method and system for authenticating an accessory |
US7529871B1 (en) | 2004-04-27 | 2009-05-05 | Apple Inc. | Communication between an accessory and a media player with multiple protocol versions |
US7673083B2 (en) | 2004-04-27 | 2010-03-02 | Apple Inc. | Method and system for controlling video selection and playback in a portable media player |
US7634605B2 (en) | 2004-04-27 | 2009-12-15 | Apple Inc. | Method and system for transferring stored data between a media player and an accessory |
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US7525216B2 (en) * | 2005-01-07 | 2009-04-28 | Apple Inc. | Portable power source to provide power to an electronic device via an interface |
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US7848527B2 (en) | 2006-02-27 | 2010-12-07 | Apple Inc. | Dynamic power management in a portable media delivery system |
US8006019B2 (en) | 2006-05-22 | 2011-08-23 | Apple, Inc. | Method and system for transferring stored data between a media player and an accessory |
US7415563B1 (en) | 2006-06-27 | 2008-08-19 | Apple Inc. | Method and system for allowing a media player to determine if it supports the capabilities of an accessory |
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US8001400B2 (en) * | 2006-12-01 | 2011-08-16 | Apple Inc. | Power consumption management for functional preservation in a battery-powered electronic device |
US8900731B2 (en) * | 2007-08-24 | 2014-12-02 | Motorola Solutions, Inc. | Charger system for communication devices using a charger circuit to communicate a charge status to a portable host device |
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US8069356B2 (en) * | 2010-01-06 | 2011-11-29 | Apple Inc. | Accessory power management |
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US9553341B2 (en) | 2014-02-25 | 2017-01-24 | Motorola Solutions, Inc. | Method and apparatus for controlling access to a logic circuit in a battery by multiple components connected to the battery |
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- 2000-12-18 WO PCT/US2000/034332 patent/WO2001045231A1/en active Application Filing
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US20040212941A1 (en) * | 2003-04-22 | 2004-10-28 | Haas William Robert | Power sharing system and method for battery operated controller and application modules |
US7105953B2 (en) * | 2003-04-22 | 2006-09-12 | Hewlett-Packard Development Company, L.P. | Power sharing system and method for battery operated controller and application modules |
GB2447917A (en) * | 2007-03-27 | 2008-10-01 | Thorn Security | Using resistors in a fire detector to indicate the life span or manufacturing date of each sensor |
US20100201327A1 (en) * | 2007-06-25 | 2010-08-12 | Mitsumi Electric Co, Ltd | Battery pack |
US8193774B2 (en) * | 2007-06-25 | 2012-06-05 | Mitsumi Electric Co., Ltd. | Battery pack |
US20150084783A1 (en) * | 2013-09-25 | 2015-03-26 | Cgg Services Sa | Geophysical survey node rolling method and system |
US9753174B2 (en) * | 2013-09-25 | 2017-09-05 | Cgg Services Sas | Geophysical survey node rolling method and system |
Also Published As
Publication number | Publication date |
---|---|
US6316916B2 (en) | 2001-11-13 |
WO2001045231A1 (en) | 2001-06-21 |
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