Circuit preventing battery from over discharging

Details Circuit preventing battery from over discharging Circuit preventing battery from over discharging

1999-04-08

2000-05-16

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell discharging

Regulated discharging

320135, H02J 700

Patent

active

060641851

ABSTRACT:
A circuit preventing battery from over discharging, which is able to prevent battery from over discharging during the time that a DC/DC converter stops the operation, even at the state that the battery is discharged and needs to be recharged, is provided. The circuit preventing battery from over discharging provides a first p type MOS transistor whose gate cut voltage is V1, a second p type MOS transistor whose gate cut voltage V2 and V2<V1, a light emitting section of photocoupler which is connected to the drain of the first p type MOS transistor and the gate of first p type MOS transistor and a light receiving section of photocoupler which connects to the drain of the first p type MOS transistor and the drain of the second p type MOS transistor, and becomes on state at the time when a current flows into the light emitting section of photocoupler. With this construction, by preventing battery from over discharging, making the battery life long and shortening the recharging time are possible.

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