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Ni-Cd battery charge circuit consist of CD4040

2016-05-11 22:17  
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Ni-Cd battery charge circuit consist of CD4040
CD4040 counter chipformed the cadmium nickel battery charger as show in the picture. It can chargefor four quarter of cadmium nickel battery whoes capacity is 500mA , charge current charging time for 50mA, for l. five hours, and after finishing with charging the function of power. 555 time-based circuit constitute a clock signal generator, produce the l0Hz square wave signal, and its period for 6 seconds. When switching power supply, due to the 3 IC2 feet, so that the output low level VT1 semiconductor tube conduction, and make relay Kl suck close work, contact K1-1 closed, switch S in captive. Now charging current direction battery, and began to the battery. Status indicator LED lighted, said charging is ongoing. CD4040 countermakes upfrequency divider and charging circuit. In the meanwhile, ICl switch on the power of the clock signal loss to produce the IC2 ⑩ feet, IC2 start counting. Because IC2 8192 was taken into the points: 1, therefore, only the frequency of an 8192 in counting pulse reach a IC2 feet by the (3) will only low level into high level, make VTl Kl stop work deadlines, and release the contacts K1-1, make it become disconnected from the state, bringing to a halt the charge. VD2 is used to prevent battery into circuit current reversed.