Modelling and simulation of bridgeless PFC modified SEPIC rectifier with multiplier cell

This paper introduces a new bridgeless rectifier that operates with high power factor and high efficiency. The proposed rectifier is derived from the conventional single-ended primary inductance converter (SEPIC) and it is suitable for universal line applications. Multiplier cells have been introduced in the literature to extend the converter gain and to decrease the voltage stresses across the converter switches. The reduced voltage stress across the power switch enables the use of a lower voltage and RDS-ON MOSFET switch, which will further reduce the conduction losses. Moreover, the low voltage stress across the diodes allows the use of Schottky rectifiers for alleviating the reverse-recovery current problem, leading to a further reduction in the switching and conduction losses. The circuit is designed to operate in discontinuous conduction mode (DCM) to achieve almost unity power factor naturally and zero current switching at switch turn on. Large and small signal models of the proposed converter are detailed. Detailed open and closed loop analysis, simulation & experimental results are presented.