Voltage sensing circuit and battery pack monitoring system
AssigneeDenso Corporation
InventorKazutaka Honda
Life of this patent
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Abstract
A voltage sensing circuit includes a difference voltage sensing circuit and a leakage cancelling circuit. The difference voltage sensing circuit includes two sensing capacitors, a first sensing switch, a second sensing switch, and a third sensing switch. A first group including the first sensing switch and the second sensing switch and a second group including the third sensing switch are complementally turned on and turned off. The leakage cancelling circuit includes two compensation capacitors, a first compensation switch, a second compensation switch, and a third compensation switch. A third group including the first compensation switch and the second compensation switch and a fourth group including the third compensation switch are complementally turned on and turned off.
Claims12
A voltage sensing circuit sensing a voltage difference between two input nodes, comprising:
- a difference voltage sensing circuit sensing the voltage difference by sampling voltages of the two input nodes;
- and
- a leakage cancelling circuit generating a compensation charge that is used to compensate a charge leaked from the two input nodes due to an operation of the difference voltage sensing circuit, by using a cancelling voltage, wherein
- the difference voltage sensing circuit has a differential configuration, where two sensing capacitors that are a pair, a first sensing switch that connects and disconnects a wiring between one of the two sensing capacitors and one of the two input nodes, a second sensing switch that connects and disconnects a wiring between the other one of the two sensing capacitors and the other one of the two input nodes, and a third sensing switch that connects and disconnects a wiring between the two sensing capacitors are arranged,
- a first group including the first sensing switch and the second sensing switch and a second group including the third sensing switch are complementally turned on and turned off,
- the leakage cancelling circuit has a differential configuration, where two compensation capacitors that are a pair, a first compensation switch that connects and disconnects a wiring between one of the two compensation capacitors and one of the two input nodes, a second compensation switch that connects and disconnects a wiring between the other one of the two compensation capacitors and the other one of the two input nodes, and a third compensation switch that connects and disconnects a wiring between the two compensation capacitors are arranged, and
- a third group including the first compensation switch and the second compensation switch and a fourth group including the third compensation switch are complementally turned on and turned off.
Dependencies are inferred from the claim text.