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1.待机控制电路待机控制电路由Q836、Q834、Q831和间歇振荡控制电路、恒流驱动控制电路组成。Q834通过“光耦”Q829控制开关电源初级的恒流驱动电路,Q831通过“光耦”Q826控制间歇振荡电路。开机时,微处理器ICA01的輯訛輧脚输出低电平,开/关机控制电路Q836导通,与Q836集电极相连接的Q831、Q834获电导通。其中Q834导通,通过“光耦”Q829打开初级的恒流驱动电路;Q831导通,迫使间歇振荡控
1. Standby control circuit Standby control circuit consists of Q836, Q834, Q831 and intermittent oscillation control circuit, constant current drive control circuit. Q834 through “optocoupler ” Q829 control switching power supply primary constant current drive circuit, Q831 through “optocoupler ” Q826 control intermittent oscillation circuit. Boot, the microprocessor ICA01 series of false positives output low, on / off control circuit Q836 conduction, and Q836 collector connected to the Q831, Q834 be electrically conductive. Which Q834 conduction through “optocouplers” Q829 open the primary constant current drive circuit; Q831 turn-on, forcing intermittent oscillation control