Automatic charging and discharging circuit

Published:2011/7/14 19:29:00 Author:TaoXi | Keyword: Automatic, charging, discharging | From:SeekIC

Operating principle The circuit is as shown in the figure 4-4. The city electricity is reduced, rectified and filted by the circuit to output the +18V power supply voltage, the voltage stabilization circuit is composed of V1, R1, VD5, this voltage stabilization circuit outputs the +12V voltage to the whole circuit through the emitter V1. The +9V voltage stabilization circuit is composed of R2, C2, VD6, it supplies the power to the NE555. The 1Hz pulse signal generator is composed of the NE555 and the external components, it outputs the time pulse signal from pin-3, the waveform is as shown in the figure. The time pulse signal gets into the reversed phase amplifier V2 through the normally closed contact point K2-2 to drive the cut-off and conduction of V3, V4 directly. When the V3 is conducting and the V4 is cutting off, the +12V voltage charges the battery through VD8, V3, R7.



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