| 摘要 |
A battery charger includes a first charging circuit controlling input power to charge an external battery detachably mounted to the charger; an internal secondary battery charged by the input power; a charge/discharge control circuit for charging the internal battery by the input power and controlling a charge of the internal battery; and a control circuit for controlling an operative state of the first charging circuit and the charge/discharge control circuit. The charger serves to charge the detachably mounted external battery both by the input power and by the power from the internal battery. The charger is so structured that when the input power is not in an inputted state, the control circuit supplies the electric power from the internal battery to the charge/discharge control circuit where an operative state of the internal battery is controlled, thus discharging the internal battery to charge the external battery.
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