Power factor correctors based on coupled-inductor Sepic and Cuk converters with nonlinear-carrier control

Abstract

This paper presents the design of high performance power factor correctors based on coupled-inductor Sepic and Cuk power converters operating in the continuous conduction mode. All inductive components are realized on the same magnetic core and designed so that levels of switching-frequency ripples and conducted EMI are greatly reduced. Input-current shaping and output voltage regulation are accomplished using the nonlinear-carrier control technique. A Spice-compatible large-signal averaged model is introduced to facilitate computer-aided design verification. The design and the models are validated by experimental results on two power factor correctors based on the coupled-inductor Sepic and Cuk power converters.