Bridgeless DCM SEPIC PFC Rectifiers With Low Conduction And Switching Losses

The AC-DC converters need to improve power quality in terms of power factor correction for reduced total harmonic distortion at input ac mains and precisely regulated dc output.This paper deals with a Single phase AC-DC Bridgeless Discontinuous Conduction Mode (DCM) with Single Ended Primary Inductance Converter (SEPIC) for Power Factor Correction (PFC) recti er . The topology is improved by the absence of an input diode bridge and the presence of only two semiconductor switches in the current  growing path during each switching cycle which results in lesser conduction losses and improved thermal management compared to the conventional SEPIC converters. By implementing the improved topology in DCM it ensures almost unity power factor in a simple and e ective manner. The DCM operation gives additional advantages such as zero-current turn-on in the power switches, zero-current turn-o in the output diode and reduces the complexity of the control circuitry.Performance comparisons between the proposed and conventional Sepic PFC recti ers are performed.

>Power Factor Correction (PFC)

>Types of Power Factor Correction (PFC)

>Passive Power Factor Correction

>Active Power Factor Correction

>Sepic Converter

>SEPIC converter for PFC

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