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

• Published in: IEEE transactions on industrial electronics (1982) Vol. 64; no. 4; pp. 2836 - 2847
• Main Authors: Benfei Wang, Liang Xian, Kanamarlapudi, Venkata Ravi Kishore, King Jet Tseng, Ukil, Abhisek, Hoay Beng Gooi
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-04-2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Buck converters; Circuits; Control; Control systems; Control systems design; Cost function; Cross regulation; DC-DC power converters; Hybrid systems; Inductors; MIMO; MIMO (control systems); model predictive control (MPC); power sharing; Power sources; Predictive control; Renewable energy sources; single-inductor multiple-input multiple-output (SI-MIMO); Time multiplexing; Voltage control; Voltage converters (DC to DC)
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2016.2631438

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.