| 摘要 |
A charging and discharging control circuit has a construction which limits current consumption. A plurality of detecting circuits detect at least one of an over-charge voltage and an over-discharge voltage of an electric power source and output a corresponding signal. A control circuit receives an output signal of the detecting circuits and outputs a signal for controlling the charging and discharging of the secondary batteries. In order to limit current consumption, a single source current is provided to each of the detecting circuits. In a preferred embodiment, the electric power source comprises a plurality of serially-connected batteries and the detecting circuits each comprise a comparator for comparing a reference voltage with a voltage representing an output voltage of a respective battery. At least one of the positive power supply terminals and negative power supply terminals of the comparators are serially connected so that the power supply current of the charging and discharging control circuit is limited.
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