| 摘要 |
PURPOSE: To provide a stable overcharge preventive device which can efficiently discharge even a battery where the overcharge preventive function is operating. CONSTITUTION: In an overcharge preventive device, which is equipped with a chargeable battery, a voltage detector 2, which detects the voltage of the battery 1, a switch circuit 3, which is provided in series with the battery 1, and the switch circuit 3 of which is turned off to break the charge charge, based on the output OV of the voltage detector 2, a current detecting circuit 4 having an element Ri for current detection is connected to the switch circuit 3, and the switch circuit 3 is turned on, based on the output S of the current detecting circuit 4, at the time of discharge of the battery 1. |
