Automatic charging, power supply dual-use device circuit

Published:2011/7/13 22:58:00 Author:TaoXi | Keyword: Automatic, charging, power supply, dual-use, device circuit | From:SeekIC

Operating principle: The circuit is as shown in figure 4-3, this device uses three pieces of integrated circuits: IC1 is the LM317, the adjustable voltage stabilization power supply is composed of LM317 and other surrounding components, the adjustment range is 1.25V-15V; IC2 is the pulse oscillator which is composed of the time base circuit 555, the duty ratio is 60%; IC3 is the high current and low current charging and discharging conversion control circuit. After you pressing the button AN, the battery voltage is lower than the gate voltage of D, so D outputs the high level, the transistor V4 conducts, the relay K closes to form the self-protection.



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