Automatic power off charger circuit

Published:2011/7/14 20:53:00 Author:TaoXi | Keyword: Automatic, power off, charger circuit | From:SeekIC

Operating principle: The circuit is as shown in figure 4-31, the whole circuit is composed of rectifier and filter circuit, the constant current charging circuit, the timing control circuit, because the timer's accuracy requirement is not high, so we can use the simple rectification circuit. The charging part uses the constant current charging mode, the circuit is simple and the effect is good. The timing part uses the composite tube operating mode. When you press S, the 220V AC current is reduced, rectified and filted by the T, VD1-VD4 and C1, so we get the 12V DC. The 12V DC not only supplies the charging voltage to the VD5, R1 and LED, but also charges C2 through S2.



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