Nickel cadmium battery charger circuit diagram

This circuit adopts automatic control and constant current charging method. The nominal voltage of the battery being charged is 10V, and the charging termination voltage is 12V. T2, T3 and related components form a constant current source , and the current value is approximately 4.8V/R1. Diode D1 is designed to prevent the battery from discharging when the AC power supply is cut off or the rectifier circuit fails. LM311 is a comparator. Once charged to the set value, it outputs low level, T1 is saturated and turned on, T2 constant current source stops working, and charging stops. When charging, LED D2 lights up; D3 serves as power indicator.