A Digital Method of Power-Sharing and Cross-Regulation Suppression for Single-Inductor Multiple-Input Multiple-Output DC–DC Converter

Abstract

This paper presents a digital method to regulate the single-inductor multiple-input multiple-output (SI-MIMO) dc-dc converter, which can integrate renewable sources and loads as the hybrid renewable energy system with less components. The digital method is able to achieve power-sharing and cross-regulation suppression, and it is named as PS-CRS. PS-CRS is based on model predictive control, power sharing, and time multiplexing. A power-sharing controller is developed to regulate the power from multiple power sources. A cross-regulation-suppression controller is designed to control the output voltages independently with reduced cross regulation, which is the critical issue of the single-inductor multiple-output dc-dc converter. Experimental prototype of a single-inductor dual-input dual-output buck converter is built for verification. The steady-state operation and dynamic performance cases are studied. The results demonstrate that PS-CRS is able to regulate the SI-MIMO dc-dc converter effectively and robustly.