Voltage detecting device for set battery
First Claim
1. A voltage detecting device for a set battery which comprises a plurality of battery modules connected to each other in series, said voltage detecting device comprising:
- a plurality of differential voltage detecting circuits for detecting module voltages of said battery modules, respectively;
an A/D convertor for A/D converting output voltages of said differential voltage detecting circuits; and
reference voltage providing circuits for providing reference voltages to said differential voltage detecting circuits, wherein said differential voltage detecting circuits are grouped into several voltage detecting blocks so that differential voltage detecting circuits for respectively detecting module voltages of said battery modules contiguous to each other constitute one of said voltage detecting blocks, a common reference voltage is provided to said differential voltage detecting circuits belonging to a same voltage detecting block by said reference voltage providing circuit, and said reference potentials are set to values which differ from each other for said respective voltage detecting blocks.
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Accused Products
Abstract
A set battery which generates a high voltage comprises a number of battery modules connected to each other in series. A module voltage of each of the battery modules is detected by a corresponding differential voltage detecting circuit and is transmitted to an A/D convertor. Each of Several voltage detecting blocks is constituted by a plurality of the differential voltage detecting circuits for detecting module voltages of a plurality of the battery modules contiguous to each other. Each of the differential voltage detecting circuits belonging to the same voltage detecting block is applied with a common reference potential which is used to detect the module voltage. The reference potential is set to values which differ from each other for the respective voltage detecting blocks.
39 Citations
25 Claims
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1. A voltage detecting device for a set battery which comprises a plurality of battery modules connected to each other in series, said voltage detecting device comprising:
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a plurality of differential voltage detecting circuits for detecting module voltages of said battery modules, respectively;
an A/D convertor for A/D converting output voltages of said differential voltage detecting circuits; and
reference voltage providing circuits for providing reference voltages to said differential voltage detecting circuits, wherein said differential voltage detecting circuits are grouped into several voltage detecting blocks so that differential voltage detecting circuits for respectively detecting module voltages of said battery modules contiguous to each other constitute one of said voltage detecting blocks, a common reference voltage is provided to said differential voltage detecting circuits belonging to a same voltage detecting block by said reference voltage providing circuit, and said reference potentials are set to values which differ from each other for said respective voltage detecting blocks. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
photo couplers for transmitting output signals of said A/D convertor circuits to a digital signal processing circuit operated with a predetermined low power source voltage.
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4. A voltage detecting device according to claim 1, wherein each of said voltage detecting blocks includes at least three differential voltage detecting circuits for respectively detecting module voltages of at least three battery modules contiguous to each other, and each of said reference voltages is set to an intermediate potential which is lower than the highest potential among said battery modules and is higher than the lowest potential among said battery modules.
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5. A voltage detecting device according to claim 4, wherein said reference voltage providing circuits generate each of said reference voltages from a terminal voltage of a battery module which is most close to a middle potential between said highest and lowest potentials among said battery modules corresponding to said differential voltage detecting circuits belonging to a same voltage detecting block.
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6. A voltage detecting device according to claim 1, wherein each of said differential voltage detecting circuits detects a module voltage by deriving a first difference between a high potential side voltage of a corresponding battery module and said reference voltage, deriving a second difference between a low potential side voltage thereof and said reference voltage, and subtracting said second difference from said first difference.
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7. A voltage detecting device according to claim 6, wherein said A/D convertor has a plurality of A/D convertor circuits each of which is assigned to each of said voltage detecting blocks, and each of said A/D convertor circuits sequentially A/D-converts said output voltages of said differential voltage detecting circuits belonging to a same voltage detecting block.
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8. A voltage detecting device according to claim 7, further comprising:
photo couplers for transmitting output signals of said A/D convertor circuits to a digital signal processing circuit operated with a predetermined low power source voltage.
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9. A voltage detecting device according to claim 6, wherein each of said voltage detecting blocks includes at least three differential voltage detecting circuits for respectively detecting module voltages of at least three battery modules contiguous to each other, and each of said reference voltages is set to an intermediate potential which is lower than the highest potential among said battery modules and is higher than the lowest potential among said battery modules.
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10. A voltage detecting device according to claim 9, wherein said reference voltage providing circuits generate each of said reference voltages from a terminal voltage of a battery module which is most close to a middle potential between said highest and lowest potentials among said battery modules corresponding to said differential voltage detecting circuits belonging to a same voltage detecting block.
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11. A voltage detecting device for a set battery which comprises a plurality of battery modules connected to each other in series, said voltage detecting device comprising:
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a plurality of differential voltage detecting circuits for detecting module voltages of said battery modules, respectively;
reference voltage providing circuits for providing reference voltages to said differential voltage detecting circuits;
wherein said differential voltage detecting circuits are grouped into several voltage detecting blocks so that differential voltage detecting circuits for respectively detecting module voltages of said battery modules contiguous to each other constitute one of said voltage detecting blocks, a common reference voltage is provided to said differential voltage detecting circuits belonging to a same voltage detecting block by said reference voltage providing circuit, and said reference potentials are set to values which differ from each other for said respective voltage detecting blocks;
a plurality of voltage A/D convertors for individually A/D-converting module voltages of said battery modules;
a current A/D convertor for A/D-converting set battery current; and
a control circuit which causes said voltage A/D convertors and said current A/D convertor to simultaneously read in analog signals representative of said module voltages and said set battery current and which sequentially reads out digital signals from the respective A/D convertors.- View Dependent Claims (12, 13, 14, 15)
a total voltage A/D convertor for A/D-converting a total voltage of said set battery, said control circuit simultaneously detects said total voltage of said set battery and said respective module voltages.
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14. A voltage detecting device according to claim 13, wherein said control circuit compares said total voltage with a sum of said module voltages to determine an occurrence of failure in said set battery.
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15. A voltage detecting device according to claim 11, wherein each of said A/D convertors reads in said analog signal in synchronism with a clock pulse when a reading instruction is inputted thereto, A/D-converts said analog signal into said digital signal and thereafter generates, as a serial signal, an output of said digital signal responsive to a clock pulse successively inputted thereto, and said control circuit instructs simultaneous reading of the analog signals to said A/D convertors and thereafter sequentially sends out said clock pulses to said A/D convertors by which said digital signals are sequentially outputted from said A/D convertors.
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16. A voltage detecting device for a set battery which comprises a plurality of battery modules connected to each other in series, said voltage detecting device comprising:
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a plurality of differential voltage detecting circuits for respectively detecting module voltage of each battery module, said differential voltage detecting circuits are grouped into several voltage detecting blocks;
a plurality of reference voltage equalizing circuits each of which providing a common reference voltage to said differential voltage detecting circuits belonging to a same voltage detecting block; and
a reference voltage changing circuit for making said common reference voltage of each reference voltage equalizing circuit different from that of the other reference voltage equalizing circuit for the other voltage detecting block. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25)
photo couplers for transmitting output signals of said A/D convertor circuits to a digital signal processing circuit operated with a predetermined low power source voltage.
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19. A voltage detecting device according to claim 16, wherein each of said voltage detecting blocks includes at least three differential voltage detecting circuits for respectively detecting module voltages of at least three battery modules contiguous to each other, and each of said reference voltages is set to an intermediate potential which is lower than the highest potential among said battery modules and is higher than the lowest potential among said battery modules.
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20. A voltage detecting device according to claim 19, wherein said reference voltage equalizing circuits generate each of said reference voltages from a terminal voltage of a battery module which is most close to a middle potential between said highest and lowest potentials among said battery modules corresponding to said differential voltage detecting circuits belonging to a same voltage detecting block.
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21. A voltage detecting device according to claim 16, wherein each of said differential voltage detecting circuits detects a module voltage by deriving a first difference between a high potential side voltage of a corresponding battery module and said reference voltage, deriving a second difference between a low potential side voltage thereof and said reference voltage, and subtracting said second difference from said first difference.
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22. A voltage detecting device according to claim 21, further comprising an AID convertor for A/D converting output voltages of said differential voltage detecting circuits, wherein said A/D convertor has a plurality of A/D convertor circuits each of which is assigned to each of said voltage detecting blocks, and each of said A/D convertor circuits sequentially A/D-converts said output voltages of said differential voltage detecting circuits belonging to a same voltage detecting block.
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23. A voltage detecting device according to claim 22, further comprising:
- photo couplers for transmitting output signals of said A/D convertor circuits to a digital signal processing circuit operated with a predetermined low power source voltage.
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24. A voltage detecting device according to claim 21, wherein each of said voltage detecting blocks includes at least three differential voltage detecting circuits for respectively detecting module voltages of at least three battery modules contiguous to each other, and each of said reference voltages is set to an intermediate potential which is lower than the highest potential among said battery modules and is higher than the lowest potential among said battery modules.
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25. A voltage detecting device according to claim 24, wherein said reference voltage equalizing circuits generate each of said reference voltages from a terminal voltage of a battery module which is most close to a middle potential between said highest and lowest potentials among said battery modules corresponding to said differential voltage detecting circuits belonging to a same voltage detecting block.
Specification