Miniaturization of a Transformer-Linked Multi-Phase Boost Chopper Circuit Using Boost Ratio Adjustment

Abstract

This paper presents an approach to miniaturize a boost chopper circuit. The size of a switching power converter strongly depends on that of a capacitor and an inductor. A multi-phase boost chopper circuit composing a coupled inductor that can achieve miniaturization of an inductor and an output smoothing capacitor is proposed. It is important to adjust the relationship between the boost ratio and the duty ratio because the effect of miniaturizing a multi-phase boost chopper circuit varies depending on the duty ratio. In order to realize effective miniaturization of the proposed converter, this paper presents a scheme involving the adjustment of the boost ratio by a tapped inductor.