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Cell phone battery charging circuit with the discharge funct

2016-05-10 17:36  
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Cell phone battery charging circuit with the discharge function
1. Circuit and working principle: The cell phone Lithium battery charge principle with the discharge function is as shown in the figure, the circuit structure can be divided into two parts: (1) The discharger circuit is composed of the operational amplifiers A1-A4, the voltage regulator IC1 and the transistor BG1. The discharger core circuit is composed of the R-S flip-flop to control the conduction and on-off of the discharge tube BG1. (2) The charging circuit is composed of the DC/DC buck type switching voltage regulator, it outputs the 4.2V voltage. 2. Component selection: The IC1 uses the TL431, it is in the TO-92 package; the IC2 uses the MC34063, it is in the 8-pin dual-row DIP package; the A1-A4 use the LM324.