An Active Current Reconstruction and Balancing Strategy With DC-Link Current Sensing for a Multi-phase Coupled-Inductor Converter

• Published in: IEEE transactions on power electronics Vol. 27; no. 4; pp. 1697 - 1705
• Main Authors: Younghoon Cho, Koran, A., Miwa, H., York, B., Jih-Sheng Lai
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.04.2012; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Applied sciences; Bandwidth; Battery charger; Controllers; Convertors; current balancing; Current measurement; current sharing; dc-dc converters; Direct current networks; Electric currents; Electrical engineering. Electrical power engineering; Electrical equipment; Electrical machines; Electrical power engineering; Electronics; Exact sciences and technology; Magnetic devices; multiphase converters; Power networks and lines; Pulse width modulation; Resistance; Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices; Sensors; Switches; Switching; Transformers and inductors; Voltage control; Performance evaluation; Waveform; Prototype; Electric energy transportation; Inductor; Voltage control; Implementation; System performance; dc-dc converters; Direct current; multiphase converters; Battery chargers; current balancing; Balancing; Saturation; Direct current convertor; Direct current line; Battery charging; Algorithm; Switching; Current control; Digital control; Current sensor; Phase converter; current sharing; Battery charger; Pulse duration modulation
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2011.2170590

This paper proposes an active technique to reconstruct and balance the phase currents in multiphase dc-dc converters implementing both of voltage- and current-mode controls. Only one current sensor at the dc link is required to measure and reconstruct the phase currents. Multiple current samples in the pulsewidth modulation switching period are synchronized with the carrier waveforms to actively reconstruct the phase currents using a simple active balancing algorithm that is implemented in a digital controller. The proposed technique improves system performance, stability, and efficiency, and prevents inductor saturation. A 5-kW four-phase dc-dc converter prototype for battery charging application is built to experimentally verify the proposed algorithm.