6V power supply emergency light automatic charging and discharging circuit

Published:2011/6/23 1:19:00 Author:TaoXi | Keyword: 6V, power supply, emergency light, automatic, charging, discharging | From:SeekIC

The circuit and working principle of the emergency light: the 6V power supply supplies the reference voltage for the base electrode T1, the relay J realizes the self-locking and automatic power-off of the switch K, when you connect the battery and press K, the power indicator light L turns on, and J closes, the K is locked by its contact point J-0, the charging begins, at this time the battery owes the electricity, so the emitter voltage of T1 is lower than (7.5V+0.65V), T1 and T2 cut off, they have no effect on T3. When the battery voltage is charged to 735V, the emitter voltage of T1 is 7.5V+0.65V, so T1 and T2 conduct, T3 cuts off because the base electrode voltage decreases, J releases and J-0 cuts off, the charging stops.



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