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Constant current & voltage lithium battery charger circu

2016-05-11 08:48  
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Constant current & voltage lithium battery charger circuit
This device is designed as one kind of constant current & voltage lithium battery charger circuit, the precision adjustable voltage regulator is composed of the Q1, R1, W1, TL431. The adjustable constant current circuit is composed of the Q2、W2、R2. The charging indicator circuit is composed of the Q3、R3、R4、R5 and LED. As the charged battery's voltage increases gradually, the charge current will be reduced gradually, when the battery is full, R4's pressure-drop will be decreased, and the Q3 cuts off, the LED turns off to ensure the battery is sufficient, please continue to charge the battery for 1-2 hours after the indicator light turns off, you need to install the heatsink on Q2 and Q3.