Series Resonant Matrix Converter Topology for EV DC Fast Charging

Abstract: In this paper, we presented a matrix converter with a high-frequency DC link for EV DC fast charging applications. Introducing this topology allows eliminating electrolytic capacitors in DC link of the converter, which potentially increases the reliability and power density of the system. The converter uses bidirectionally blocking three-phase rectifier to generate a high-frequency square wave voltage for the series resonant LC DC/DC converter, eliminating one H-bridge in front of the resonant tank. Principles of high-frequency and low-frequency modulations are described. A low voltage prototype has been built and tested which demonstrated ZVS soft switching of all the transistors in the converter. Peak efficiency estimated as 98.0 % for state-of-the-art switches.