Circuit diagram of 9V charger which can preset the end voltage of charging

Published:2011/9/7 4:00:00 Author:Vicky | Keyword: 9V charger, preset the end voltage of charging | From:SeekIC

The picture is a circuit of 9V charger which can preset the end voltage of charging. The charger has four groups of identical charging circuit, which can charge four pieces of PP3 type 9V nickel-cadmium battery at the same time. The end voltage can be set between 8.5 to 10V. The voltage comparators IC2A~IC2D constitute four groups of charging circuit with T1~T4 respectively. Every circuit can charge a PP3 type 9V nickel-cadmium battery. 15V DC voltage is divided by voltage divider composed of R17, P1, R18, and D1. The base voltage of 8.5~10V can be gained in the sliding end by adjusting P1. The voltage is added to non-inverting input ends of the four comparators by four 100KΩ isolation resistance. The voltage of every group charged is added to inverting end of its corresponding comparators via a 100KΩ resistance to compare with the base voltage.



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