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Ni-Cd battery charging circuit

2016-05-10 06:24  
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Ni-Cd battery charging circuit
In the circuit, R1 is 10Ω, R2 is 200Ω. When the switch is up closed, the charging current is 60mA(constant current); when the switch is down closed, the charging current is 3mA(constant current). The total pressure drop of silicon diodes CR1, CR2 is 1.2V, and the Q1 emitter pressure drop is 0.6V, so the net pressure drop on R1 or R2 is 0.6V. 0.6V divided by the required charging current (using ampere), then it is the resistance of R1 or R2. LED indicates the work state of this charging circuit.