| 摘要 |
a first differential amplifying part(1) amplifying the voltage of a battery; a second differential amplifying part(2) amplifying the voltage amplified in the first differential amplifying part(1) by comparing with a reference voltage; a voltage window connection switching part(5) switching a voltage window connection with multiple steps; a voltage window connecting part(4) outputting the reference voltage of the second differential amplifying part(2); and a micom(3) detecting the voltage of the battery by inputting the output of the second differential amplifying part(2).
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