Patent ID: 6952354
Filing Date: 2005-10-04
Classification: H02M,Y02B,Y02P

Abstract:
1. A single stage PFC power converter, comprising: a bridge rectifier, rectifying an AC line voltage to an input voltage; a transformer, having a primary winding and a secondary winding, wherein said secondary winding is coupled to a secondary circuit, and a first terminal of said primary winding and a first terminal of said secondary winding have same polarity; a high-side switch; a low-side switch, wherein said high-side switch is coupled between said input voltage and a second terminal of said primary winding, said low-side switch is coupled between said first terminal of said primary winding and a ground reference level; a first flyback diode, wherein an anode of said first flyback diode is coupled to said ground reference level and an cathode of said first flyback diode is coupled to said second terminal of said primary winding; a second flyback diode, wherein an anode of said second flyback diode is coupled to said first terminal of said primary winding; a bulk capacitor, wherein a positive terminal of said bulk capacitor is coupled to a cathode of said second flyback diode and a negative terminal of said bulk capacitor is coupled said ground reference level; a forward inductor; and a forward diode, wherein a cathode of said forward diode is coupled to said input voltage, an anode of said forward diode is coupled to a first terminal of said forward inductor; and a second terminal of said forward inductor is coupled to said positive terminal of said bulk capacitor.