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CCCV Lithium Battery Charge Control Schematic Circuit

2016-05-12 06:10  
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CCCV Lithium Battery Charge Control Schematic Circuit
This is a CCCV lithium battery charging control panel.Q1, R1, W1, TL431 in the figure compose a precise and adjustable constant-voltage circuit. Q2, W2, R2 constitute an adjustable constant-current circuit. Q3, R3,R4 ,R5, LED is a battery charging circuit. As the voltage of the charging lithium battery rises gradually, the charging current will decrease . When the battery is filled, pressure drop on the R4 will gradually decrease till Q3 is cut off, and eventually LED would extinguish. In order to ensure adequate charge of the battery , please continue to charge for 1 ~ 2 hours after the light extinguishes , and install cooling fin of proper size in Q2, Q3 when in use.