Patent ID: 9621055
Date: 2017-04-11
CPC Classifications: H02M,Y02B

Claim:
1. A controller with leakage current protection of a diode, wherein the diode is applied to a secondary side of a power converter, the controller comprising: a comparison unit for receiving a compensation voltage, and outputting a corresponding selection signal according to the compensation voltage and a threshold; a reference voltage generation unit for outputting a corresponding reference voltage range according to the corresponding selection signal; a time out signal generation unit for determining a corresponding time out according to the corresponding selection signal, and generating a corresponding time out signal when a voltage corresponding to an auxiliary winding of the power converter has no peak to cross an upper limit of the corresponding reference voltage range during the corresponding time out; and a gate signal generation unit for entering the leakage current protection or a quasi-resonant mode according to the corresponding time out signal.