Connect the battery and charger. If the battery voltage is lower than 2.8V, the U1 output is low (the U2 output is also low), so the loops of R3 and R4 are not connected, only the R2 loop is turned on, providing weak conduction to Q1. Let it output about a few milliamps of current to pre-charge the battery. When the battery voltage rises above 2.94V (1.05X2.8) or just after the battery voltage exceeds 2.94V, U1 outputs a high level and U2 continues. The output is low (the battery voltage has not reached 4.2VJ). At this time, the R2 path is turned off and the R3 path is turned on (because Q4 is turned on and its source level is low - because the U1 output is pulled low), resulting in less resistance. The value of R3 makes Q1 fully conductive, providing a high current constant current charge of hundreds of milliamps, and when this constant current charging process slowly causes the voltage of the charged Li+ battery terminal to rise to 4.2V, U2 also outputs high. The level thus turns off Q4, but it also supplies power to U3, causing U3 to start working, so U3 triggers Q3 to turn R4 on to provide a small supplemental charging current until U3 reaches the timing time and turns off Q3, then the entire charge The process is completely over.
ZGAR Aurora 1200 Puffs
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