Interleaved Sepic Converters for AC-DC Front-End Converter Application

Abstract

Abstract-In ac/dc power factor correction (PFC) applications, where a wide range dc link voltage is required, boost derived topologies are no longer the most suitable circuit topologies for universal grids. In this paper an interleaved SEPIC converter, capable of providing a wide range dc link voltage is investigated. The interleaved converter is able to process more power with reduced circuit ripples and harmonics distortion, and current stresses. Additionally, because the coupled inductors share a common magnetic core, the count of magnetic devices is kept the same as the single-phase topology. Moreover, using coupled inductors effectively solves the current sharing problems caused by the duty cycle mismatch. The phase of the gate signals among different phases can be artificially shifted by a certain degree which would contribute to reduce the circuit harmonics as well as the current ripples.