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Automatic charger circuit of homemade nickel-cadmium battery

2016-05-10 06:46  
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Automatic charger circuit of homemade nickel-cadmium battery
This charger of nickel-cadmium battery adopts given voltage to control charging. It can automaticly stop to charge when the battery voltage reach to prescribed value.working principleThe circuit is shown in diagram 4-16. Commercial power passes transformer, rectifier circuit composed of transformer T and rectifier diode VD1~VD4. Then the commercial power is filtering and outputing DC voltage by capacitor C1. Resistor R1 and LED H1 make up working power light. Three teminal regulator integrated package IC and reistor R2, R3 make up constant current circuit. The peripheral cell is Triode VT, integrated circuit LM324 and transfer switch S2 and so on. They make up constant voltage control switch circuit. Voltage regulator tube VD6 and resistor R5, R6, R7 make up charge circuit to battery. LM324's pin 6 connects standard control voltage. LM324's pin 5 connects anode of battery. When pin 5's voltage is lower than pin 6's (that is battery voltage is lower), pin 7 will output low voltage (0V). That is, pin 9's voltage si lower than pin 10's. Pin 8's output is high level, VT is turn on (that is power turn on).