Circuit of Auto power off Nickel-cadmium Battery Charger

Published:2011/8/2 Author:Zoey | Keyword: Auto power off, Nickel-cadmium Battery, Charger | From:SeekIC

This circuit uses a simple timer. The four 500-mA Nickel-cadmium cells are connected in series. After charging for 15 hours in a constant current of 50mA, the circuit will cut off automatically, the charging process will be ceased. This circuit uses a 555 timer as a clock circuit, and it can produce the square wave in a period of 6s and use the wave to trigger IC2. IC2 will be connectedto be a divider of 8192:1. While charging, transistor T1 will conduct, forcing the relay RL1 to pick up. Light of LED indicates the formal process of charge. After the 555 be sent to IC2 and 8192 clock time pulses, pin 3 of IC2 will be in high level, T1 will stop working, RL1 will release, the circuit will stop charging. Pressing the switch S1, the relay will pick up automatically, and charging process will proceed until the scheduled time.



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