Soft-Switching Two-Switch Resonant AC-DC Converter With High Power Factor

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract In AC to DC converters, power factor has significant importance. Most power converters and equipments are developed to have power factor correction technology to improve their performance. A soft-switching two-switch resonant ACDC converter with high power factor is presented. In this converter, a boost PFC circuit is integrated with a soft-switching resonant converter in order to achieve high power factor. This topology provide low component stress, high frequency operation, zero voltage switching, and applicability under a wide range of input and output conditions. The voltage across the main switches is confined to the dc-link voltage and the energy of the transformer leakage inductance is also recycled. Softswitching operation of main switches and output diodes is achieved in a resonant manner and the switching losses are significantly reduced. Thus, the overall efficiency is improved.