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Voltage limiting nickel-cadmium battery charger circuit

2016-05-11 16:12  
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Voltage limiting nickel-cadmium battery charger circuit
As shown in diagram 2-16, this charger circuit can charge to four series battery. This circuit also has theautomatic voltage limiting function. VT2 is used for current source. VD5, VD6 and VT2 can stabilize VT2's base voltage at 3V. Meanwhile they are used as charge lights. When the total voltage on the battery closes to the voltage on voltage divider R1, VT1 will start thevoltage limiting function. It is designed according to numeral value of element in the diagram, the currentis 260mAwhen it starts to charge, when Vc reaches to 5V, the current drops to 200mA, when Vc reaches to 6V, the current is almost zero.