| 摘要 |
PURPOSE:To provide an over-discharge preventive circuit for a storage battery in a simple structure at low cost. CONSTITUTION:A power feeding line 15 from the power supply 1 to a load 14 is put in an opened or closed state by a breaking circuit 16 that receives a trigger input based on a change in a state of a Zener diode 5 connected reversely to a storage battery 1. By this means, overcharging is surely prevented only with a simple circuit made up of the Zener diode 5 for detecting a decrease in voltage from the storage battery 1 and the breaking circuit 16 for making or breaking the power feeding line 15 according to a change in state of the Zener diode 5, and a low-cost over-charging circuit can be provided. |
