Patent ID: 8331113
Filing Date: 2012-12-11
Classification: H02M,Y02B

Abstract:
1. A controller for controlling a switch circuit of an AC-DC converter, comprising: a power control circuit for comparing an input current sensing signal generated by sensing an input current of the AC-DC converter and a power level control input and in response thereto generating a frequency modulation control signal, wherein the frequency modulation control signal is used to control an output power of the AC-DC converter and suppress harmonics of the input current of the AC-DC converter; and a square wave generator connected to the power control circuit for generating a driving signal used to drive the switch circuit of the AC-DC converter according to the frequency modulation control signal, wherein a frequency of the driving signal is varied with the frequency modulation control signal, thereby suppressing the harmonics of the input current of the AC-DC converter and regulating a switching frequency of the switch circuit, and regulating the output power of the AC-DC converter.