Patent ID: 7236376
Filing Date: 2007-06-26
Classification: H02M

Abstract:
1. A controller for controlling an output current at a primary-side of a power supply, comprising; a waveform detector, coupled to a current sense device of said power supply to generate a current-waveform signal by sampling a primary side switching current signal, wherein said primary side switching current signal is generated by said current sense device from a primary side switching current of a transformer of said power supply; first and second control circuits, said second control circuit generating an oscillation signal to determine a switching frequency of a switching signal, wherein said switching signal is used for switching said transformer and regulating the output of said power supply; an integrator, generating an average current signal in response to said current-waveform signal and further generating an integrated signal by integrating said average current signal with a time signal, wherein said time signal is generated in accordance with said oscillation signal; and, said first control circuit including: