FAILURE DIAGNOSIS CIRCUIT, POWER SUPPLY DEVICE, AND FAILURE DIAGNOSIS METHOD
First Claim
1. A failure diagnosis circuit comprising:
- a voltage detection unit that detects a terminal voltage of an electricity storage unit;
a current detection unit that detects a current flowing in the electricity storage unit;
a SOC calculation unit that calculates a SOC of the electricity storage unit on the basis of the current detected by the current detection unit;
a charging stopping unit that stops charging of the electricity storage unit when the SOC calculated by the SOC calculation unit reaches a preset determination value; and
a failure detection unit that determines that a failure has occurred in the voltage detection unit when a variation of the terminal voltage, which is detected by the voltage detection unit, within a predetermined time duration immediately after the charging is stopped by the charging stopping unit differs from a predicted variation when the SOC of the electricity storage unit is at the determination value.
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Accused Products
Abstract
A failure diagnosis circuit is provided with: a voltage detection unit that detects a terminal voltage of an electricity storage unit; a current detection unit that detects a current flowing in the electricity storage unit; a SOC calculation unit that calculates a SOC of the electricity storage unit on the basis of the current detected by the current detection unit; a charging stopping unit that stops charging of the electricity storage unit when the SOC calculated by the SOC calculation unit reaches a preset determination value; and a failure detection unit that determines that a failure has occurred in the voltage detection unit when a variation of the terminal voltage, which is detected by the voltage detection unit, after the charging is stopped by the charging stopping unit differs from a predicted variation when the SOC of the electricity storage unit is at the determination value.
14 Citations
12 Claims
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1. A failure diagnosis circuit comprising:
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a voltage detection unit that detects a terminal voltage of an electricity storage unit; a current detection unit that detects a current flowing in the electricity storage unit; a SOC calculation unit that calculates a SOC of the electricity storage unit on the basis of the current detected by the current detection unit; a charging stopping unit that stops charging of the electricity storage unit when the SOC calculated by the SOC calculation unit reaches a preset determination value; and a failure detection unit that determines that a failure has occurred in the voltage detection unit when a variation of the terminal voltage, which is detected by the voltage detection unit, within a predetermined time duration immediately after the charging is stopped by the charging stopping unit differs from a predicted variation when the SOC of the electricity storage unit is at the determination value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A failure diagnosis method comprising:
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a step in which a voltage detection unit detects a terminal voltage of an electricity storage unit; a step in which a current detection unit detects a current flowing in the electricity storage unit; a step in which a SOC calculation unit calculates a SOC of the electricity storage unit on the basis of the current detected by the current detection unit; a step in which a charging stopping unit stops charging of the electricity storage unit when the SOC calculated by the SOC calculation unit reaches a preset determination value; and a step in which a failure detection unit determines that a failure has occurred in the voltage detection unit when a variation of the terminal voltage, which is detected by the voltage detection unit, within a predetermined time duration immediately after the charging is stopped by the charging stopping unit differs from a predicted variation when the SOC of the electricity storage unit is at the determination value.
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Specification