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PWLC电源板开关机控制电路如图3所示②待机控制流程:当电源板收到的PS—ON信号是低电平的时候,QS3的基一射极因没有足够电压而处于截止状态,因此IC6无法工作,VC电压无法通过Q11,也无法提供VCC2和VCCl的电压,PFC电路和PWM主电源电路无法工作,就没有12 V和24 V电压输出。2.PFC(功率因素校正)电路PWL37C电源板中PFC(功率因素校正)电路,它由驱动控制电路IC2,激励电路QF3QF4,MOSFET开关管QF5、QF6,储能电感L1,充电电路D1、D2、C5组成有源PFC电路。通过电
PWLC power supply board switch control circuit shown in Figure 3 ② standby control flow: when the PS-ON signal received by the power supply board is low, the base emitter of QS3 is off because there is not enough voltage and therefore IC6 does not work, VC voltage can not pass Q11, can not provide VCC2 and VCCl voltage, PFC circuit and PWM main power circuit does not work, there is no 12 V and 24 V voltage output. 2. PFC (power factor correction) circuit PWL37C power supply board PFC (power factor correction) circuit, which consists of drive control circuit IC2, excitation circuit QF3QF4, MOSFET switch QF5, QF6, storage inductor L1, charging circuit D1, D2, C5 form the active PFC circuit. Through electricity