Counter chip of cadmium nickel battery charger circuit diagram

Published:2013/12/11 1:36:00 Author: | Keyword: Counter chip of cadmium nickel battery charger circuit diagram, CD4040 | From:SeekIC

Ni-Cd battery charger counter chip composed as shown. It can 500mA capacity of four nickel-cadmium batteries in series , the charging current is 50mA, the charging time is l.5 hours after charging is complete and has automatic power-off function. 555 circuit clock signal generator generates a square wave signal l0Hz , the period of 6 seconds. When the power is turned on , because of IC2 ③ pin output low , thus making semiconductor VT1 conduction, and to pull the relay Kl work contacts K1-1 is closed, the switch S is self-preservation. In this case the charging current flows to the battery and charging the battery starts . Status indicator LED is lit, it indicates charging is in progress. CD4040 counter constitute divider and charging circuit . While the power is turned on , the clock signal generated by ICl lost ⑩ feet of IC2 , IC2 starts counting. Since IC2 is connected to a 8192:1 divider , so only counts when you reach 8192 feet of IC2 ③ only from low to high , so VTl deadline , Kl stop working and release contact K1-1, so that it becomes the OFF state to stop the charging. VD2 is used to prevent the battery current from flowing back into the circuit.



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