Portable emergency light circuit with the automatic stop-charging function

Published:2011/7/25 2:35:00 Author:Christina | Keyword: Portable, emergency light, automatic, stop-charging function | From:SeekIC

After the power is connected, if you press the sw1, the charging indicator light led will turn on, at this time the storage battery is lack of electricity, the e pole voltage of q1 is lower than the b pole voltage, so q1 and q2 cut off, q3 conducts to close the relay, the J1-1 closes to get in the self-locking state, J1 releases, the power cuts off, the charging stops, at the same time the charging indicator light led turns off. In the figure, the d1 is the isolation diode, it can be used to prevent the reverse discharge of the storage battery, you can make the circuit charge the storage batteries with different voltage by adjusting rw1.



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