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Cadmium nickel battery charging circuit

2016-05-11 22:04  
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Cadmium nickel battery charging circuit
In this circuit, R1 is the 10Ω resistance, R2 is the 200Ω resistance. When the switch closes up, the charging current is 60mA (constant-current); when the switch closes down, the charging current is 3mA (constant-current). The total pressure drop of the silicon diode CR1 and CR2 are 1.2V, but Q1's launch pressure drop is 0.6V, so R1 or R2's net pressure drop is 0.6V. The 0.6V is divided by the required charge current, we get the resistance of R1 or R2. The LED indicates the charging circuit's working state.