Patent ID: 7183753
Filing Date: 2007-02-27
Classification: H02M,Y02B,Y02P

Abstract:
1. A power factor correction circuit for correcting an input power factor by allowing a rectified voltage, obtained by rectifying an alternating current power-supply voltage of an alternating current power-supply with a rectifying circuit, to be inputted to a main switch via a booster reactor and allowing the main switch to be turned on or turned off while converting the power-supply voltage into a direct current output voltage, comprising: a first series circuit connected between one output terminal and the other output terminal of the rectifying circuit and including a booster winding and a wind-up winding, both wound on the booster reactor, a zero-current switching reactor, a first diode and a smoothing capacitor; a second series circuit connected between one output terminal and the other output terminal of the rectifying circuit and including the booster winding of the booster reactor, and the main switch; a second diode connected between a junction, between the booster winding and the wind-up winding of the booster reactor, and the main switch and the smoothing capacitor; control means for controllably turning on and off the main switch to control an output voltage of the smoothing capacitor to a given voltage; a third series circuit including a first capacitor, and a third diode connected between a junction, between the zero-current switching reactor and the first diode, and the smoothing capacitor; and a fourth diode connected between a junction, between the first capacitor and the third diode, and the smoothing capacitor.