Flexible and Low Cost Design for a Flyback AC/DC Converter With Harmonic Current Correction

摘要

This study presents a new simple flyback ac/dc converter with harmonic current correction and fast output voltage regulation. In the proposed ac/dc converter, an extra winding wound in the transformer provides two key advantages. The size of the bulk inductor used in the conventional boost-based power factor correction cell can be significantly reduced in the proposed converter. The voltage across bulk capacitor can be held under 450 V by tuning the transformer winding ratio even though the converter operates in a wide range of input voltages (90 V～265 V/ac). This new converter complies with IEC 61000-3-2 under the load range of 200 W, and can achieve fast output voltage regulation.