Patent ID: 6373734
Filing Date: 2002-04-16
Classification: H02M,Y02B,Y02P

Abstract:
A power factor correction circuit for a boost power supply, wherein the boost power supply includes a boost converter responsive to a rectified AC line voltage, the power factor correction circuit comprising:a voltage feedback amplifier having a first input terminal responsive to an output voltage of the boost converter; a switching multiplier circuit having a first input terminal connected to an output terminal of the voltage feedback amplifier and a second input terminal responsive to the rectified AC line voltage; a current feedback amplifier having a first input terminal connected to an output terminal of the switching multiplier circuit and having a second input terminal responsive to an input current of the boost converter; and a pulse width modulator control circuit having an input terminal connected to an output terminal of the current feedback amplifier and having an output terminal for connection to a pulse width modulated switch of the boost converter.