Patent ID: 9570989
Date: 2017-02-14
CPC Classifications: H02M,Y02B

Claim:
1. A control circuit of a power converter, the power converter comprising: a primary-side coil, a secondary-side coil, a power switch, and a feedback circuit, wherein the power switch is utilized for controlling electromagnetic induction of energy between the primary-side coil and the secondary-side coil to convert an input signal into an output signal, and the feedback circuit is utilized for generating a feedback signal corresponding to a magnitude of the output signal, the control circuit comprising: an input signal detection circuit, configured to operably detect a magnitude of the input signal to generate a detection signal; a clock generation circuit, configured to operably generate a clock signal; an error detection circuit, configured to operably generate an error signal according to a reference signal and the feedback signal; a control signal generation circuit, coupled with the clock generation circuit and the error detection circuit, configured to operably control a switching frequency of the power switch according to the clock signal and the error signal; and a reverse adjusting circuit, coupled with the input signal detection circuit, configured to operably adjust the clock generation circuit or the control signal generation circuit according to the detection signal to configure the switching frequency of the power switch to be inversely proportional to the magnitude of the input signal, wherein the reverse adjusting circuit controls the clock generation circuit according to the detection signal, so that the clock generation circuit configures a frequency of the clock signal to be inversely proportional to a magnitude of the detection signal to thereby change the switching frequency of the power switch.