Patent ID: 9337737
Filing Date: 2016-05-10
CPC Classification: H02M

Claim Text:
1. A control circuit of a power converter, comprising: a voltage detection circuit coupled to detect a reflected signal for generating a voltage-loop signal; a current detection circuit coupled to detect a current of a transformer of the power converter for generating a current-loop signal; an oscillator generating an oscillation signal in accordance with an output load of the power converter; a PWM circuit generating a switching signal according to the voltage-loop signal, the current-loop signal and the oscillation signal for regulating an output of the power converter; and a load detection circuit coupled to receive a detection signal from an opto-coupler for increasing a switching frequency of the switching signal; wherein the detection signal is generated once the output of the power converter is lower than a low-voltage threshold; the oscillation signal is coupled to determine the switching frequency of the switching signal; the switching signal is used for switching the transformer through a transistor.