Patent ID: 9563212
Date: 2017-02-07
CPC Classifications: G05F,H02M

Claim:
1. A control circuit of a power converter, the power converter comprising an inductor, a first power switch, and a feedback circuit, wherein the first power switch is utilized for controlling the inductor to store or release energy 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: a comparing circuit comprising a first input terminal and a second input terminal and configured to operably generate a comparison signal according to signals received by the first input terminal and the second input terminal, wherein the first input temiinal is utilized for coupling with a reference signal while the second input terminal is utilized for coupling with the feedback signal; a periodic signal generating circuit, coupled with the comparing circuit, configured to operably generate a periodic signal, clamp an upper limit of the periodic signal to a first predetermined value, and apply the periodic signal to the first input terminal or the second input terminal of the comparing circuit; and a control signal generating circuit, coupled with the comparing circuit, configured to operably control an on time of the first power switch according to the comparison signal; wherein the periodic signal generating circuit comprises: