Patent ID: 9318950
Filing Date: 2016-04-19
CPC Classification: H02M,Y02B,Y02P

Claim Text:
1. A control circuit for reducing touch current of a power converter, wherein the power converter is a power factor correction (PFC) power converter, the control circuit comprising: an auxiliary pin for receiving a voltage generated by an auxiliary winding of the power converter; a zero-crossing signal generator for generating a zero-crossing signal according to the voltage generated by the auxiliary winding and a first reference voltage; a frequency limiting signal generator for generating a frequency limiting signal according to a gate control signal, a burst mode signal, and the voltage generated by the auxiliary winding, wherein the frequency limiting signal is used for limiting the gate control signal to a predetermined frequency; a gate signal generator for generating the gate control signal to a power switch of the power converter according to the frequency limiting signal and the zero-crossing signal; a feedback pin for receiving a feedback voltage corresponding to an output voltage of the power converter, wherein the feedback voltage corresponds to a load coupled to the power converter; a compensation voltage generation unit for generating a compensation voltage according to the feedback voltage and a second reference voltage; and a burst mode signal generation module, comprising: