Battery Watchdog Circuit

Posted on Feb 2, 2013

This circuit uses a pair of Zener diodes to monitor battery voltage of a 12-V battery. If below 11 V, 1)1 ceases to conduct, pin 3 of 102 goes high, setting FF IC2 turning on Ql, Kl, and the battery charger.

Battery Watchdog Circuit
Click here to download the full size of the above Circuit.

At excess of 14-V battery voltage (full charge), D2 conducts, resetting FF IC2, and cutting off the battery charger.

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