Automatically Charging Circuit of Battery

Published:2011/7/16 11:25:00 Author:Michel | Keyword: Battery Charging Circuit | From:SeekIC

The above picture is automatically charging circuit of battery.This circuit consists of constant current circuit and automatically cut-off the circuit etc.A1 makes both ends of RL keep the same,which ensures constant charging current IZ.VDZ1 provides 18 V benchmark voltage for the base of VDZ1,It produces constant voltage drop on R2, the voltage drop is added to phase input terminal of A1.After the comparison of A1 and RL voltage drop,IZ keeps constant value.When RL is in short-circuit, resistance R3 of the output end will cut off VT3 base current and charging current IZ will be cut off sequently to protect the circuit.Functions of VD4 and VD5 are that prevent batteries discharging via VT3 when the charger cuts off.



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