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New type nickel-cadmium battery and battery charger

2016-05-10 21:46  
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New type nickel-cadmium battery and battery charger
The principle of this circuit is shown in the following diagram. IC1, IC2, IC3 make up voltage comparator. IC4 is square wave pulse generator. The pulse width and frequencyare controlled by IC1. When IC4 outputs positive pulse, BG4 is turned on, constant current IC3 is charging to battery. When IC4 outputs negative pulse, the output is differentiationed by C2. Then itmakes BG1 and BG2 turn on in a short time. It is discharged to battery. IC1's output is inhigh level afterthepower turningon. The circuit willbe incharging state. If itneeds to discharge, we should touch discharging button AN. It can make IC1 output low level. BG1, BG2are turned on. The battery starts to discharge. Discharge light LED3 is bright. Charging light LED3 is extinguished. When battery discharges to 0.9V, IC1 outputs high level. BG1, BG2are cut off. Discharging is finished. Charging starts. When battery is charging to 1.42V, IC1's output is changed low level from high, IC2's output is changed high level from low.