Series Resonant Matrix Converter Topology for EV DC Fast Charging

TL;DR

This paper introduces a novel series resonant matrix converter with a high-frequency DC link for EV fast charging, eliminating electrolytic capacitors to enhance system reliability and power density.

Contribution

The paper proposes a new converter topology that removes electrolytic capacitors and demonstrates high efficiency and soft switching in a prototype for EV fast charging.

Findings

Achieved 98% peak efficiency with state-of-the-art switches.

Demonstrated ZVS soft switching of all transistors.

Eliminated electrolytic capacitors in the DC link.

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.