An Isolated Bridgeless Power Factor Correction Rectifier Based on SEPIC Topology

摘要

The conventional Power Factor Correction (PFC) rectifier based on BOOST topology is used only for the step-up output and has more conduction loss because of its dependency on the line power rectifier bridge Present study has proposed a novel PFC rectifier based on Single-ended Primary Inductance Converter (SEPIC) and it presents the following desirable characteristics: (1) it works as an automatic voltage follower and theoretical power factor is unity; (2) no rectifier bridge results in less conduction loss and (3) the galvanic isolation and the current continuum bring the Electromagnetic-interface (EMI) low. Present study analyzes the operation of the propose rectifier working in Discontinuous Mode (DCM) in detail, the equations for the characteristic analysis and design are derived, as well as the large-signal model is given. The simulation results are presented to demonstrate the feasibility of the proposed technique.