Patent ID: 8482268

Claim:
A correction circuit for a power converter, comprising: a sampling circuit, generating an average-current signal in response to a switching current of said power converter; a demagnetizing-time circuit, generating a discharging-time signal in response to a switching signal and an input-voltage signal; a duty circuit, generating a duty signal in response to said discharging-time signal, an on-time of said switching signal, and a switching period of said switching signal; and a compensation circuit, coupled to receive said average-current signal and said duty signal for generating a corrected signal; wherein said switching signal is utilized to switch a magnetic device for regulating an output voltage of said power converter, said discharging-time signal is correlated to a demagnetizing time of said magnetic device, said input-voltage signal is correlated to an input voltage of said magnetic device, and said corrected signal is coupled to generate said switching signal.