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Lithium battery constant voltage charging circuit

2016-05-10 03:35  
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Lithium battery constant voltage charging circuit
The figure below shows a constant current of the lithium battery charging control panel, the figure Q1, R1, W1, TL431 consist of the precision adjustable voltage circuit. Q2, W2, R2 consist of adjustable constant-current circuit. Q3, R3, R4, R5, LED are charging instructions circuit. With Rechargeable lithium battery's voltage rises gradually, charge current will gradually decrease,the R4 batteries voltage will continue to decrease after the battery is full finally ended Q3, LED is off, in order to ensure the battery is sufficient,please continue to charge 1 ~ 2 hours after the lights extinguished , it need to install the appropriate size of the heat sink at Q2, Q3 when using.