| 摘要 |
A power supply having a battery (2) that supplies electric power to an electric load (6), a current sensor (4) that detects the current of the battery (2), and a voltage sensor (5) that detects the voltage of the battery (2) includes abnormality determination means for determining that an open failure has occurred in the battery (2) when the voltage detected by the voltage sensor (5) is larger than a first predetermined change amount and the current detected by the current sensor (4) is smaller than a second predetermined change amount, and determining, if an open failure is not found in the battery (2), that an intermediate fixed failure has occurred in the current sensor (4) when the internal resistance of the battery (2) is greater than or equal to a predetermined value.
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