A flexible and low cost design for flyback AC/DC converter with harmonic current correction

A new simple flyback AC/DC converter with harmonic current correction and fast output voltage regulation is presented. In the proposed AC/DC converter, an extra winding is wounded in transformer and yields two major merits: the bulk inductor used in the conventional boost-based PFC cell is omitted in the proposed converter and consequently almost 1/2 volume and weight in magnetic material can be saved. The voltage across bulk capacitor can be hold under 450 V by tuning transformer windings ratio even though the converter operates in wide range of input voltage (90 V/spl sim/265 V/ac). This new converter complies with IEC 61000-3-2 under the load range of 200 W and it has fast output voltage regulation.