| 摘要 |
A capacity computing apparatus for computing the capacity of a chargeable secondary battery by a microcomputer, wherein a resistance is connected to the secondary battery and a drop voltage because of charging and discharging current in the resistance is amplified by an amplifier, whereby the capacity of the secondary battery is computed on the basis of the amplified value. The capacity of the secondary battery is computed with good accuracy even with a small drop of the voltage in the resistance. Moreover, an influence of an offset voltage in the amplifier is removed by applying a constant voltage to the amplifier at all times. The stored value of the microcomputer is periodically updated, thereby avoiding an influence when the amplification degree of the amplifier is changed due to the temperature change.
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