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想问一下反激电源的欠压启动问题。



已知:三相电整流后用电容滤波储能540V,从电容上取电,用3844做反激电源。

问:电容有充电过程,怎么在欠压时,即电容的充电电压低于500V时不让3844输出PWM,或者不让3844启动?或者有更好的方法。