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The safe and reliable multi-function charger circuit

2015-03-22 10:06  
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The safe and reliable multi-function charger circuit
The safe and reliable multi-function charger circuit
The principle diagram of this charger is as shown in figure 5-16. The 220V city electricity is reduced by the transformer T, and it is bridge rectified by the diodes VD1-VD4 to output the 17V, 100Hz pulsating DC voltage, this DC voltage can supply the power to the charging circuit. The DC current is stabilized by IC1 to supply power to the time-base integrated circuit IC2(NE555), so the IC2(NE555) produces the oscillation, we can use the pulse signal which is output by the pin-3 to control the conduction and cut-off of the darlington tube which is composed of the VT1 and VT2. This circuit has the RP, the electric potential of the adjustable port of it can be used to set the recharging the battery benchmark voltage.