Design of SEPIC with coupled inductors

摘要

This paper discusses the design of SEPIC with coupled inductors. The main investigation is focused on the correlation existing among the size of SEPIC capacitor, the magnitude of magnetic coupling factor of coupled inductors and the amplitude of peak-to-peak ripple current in the input side of coupled inductors. It is shown that in applications where SEPIC works as a step-down converter, if SEPIC capacitor is too small then the input ripple current can be quite large if coupled inductors have a high coupling factor.