Analysis of fly‐buck converter with emphasis on its cross‐regulation

Abstract

Cross‐regulation is one of the critical challenges in single‐input and multi‐output converters. In this study, new design guidelines and an analytical model for studying the cross‐regulation between the dual‐outputs of the fly‐buck converter are proposed. A small‐signal AC model is first established to obtain control over the output and to determine the cross‐influence transfer functions of the system. Then, a load regulation coefficient and method for analysing the cross‐regulation while considering the load magnitude and load change are proposed to study the characteristics of the fly‐buck converter. Finally, to demonstrate the rationality behind the influencing factors over cross‐regulation based on the resulting characteristics, a fly‐buck converter with double control variables and lower cross‐regulation is designed. Simulations and experimental prototypes are implemented to demonstrate the effectiveness of the proposed theoretical analysis.