Two-phase interleaved DC-DC converter with 3.3 kV SiC MOSFET modules

Abstract

This paper describes highly-efficient two-phase interleaved DC-DC converter designed and built with 3.3 kV SiC MOSFET modules. The converter is designed to connect 1.5 kV battery storage and the 800 V DC link but can operate in other similar configurations. The system is validated experimentally, and tested up to 260 kW rated power but also low power operation is presented. It is shown that the use of state-of-the-art SiC-based power modules allows to reach high power ratings, along with notable frequencies (20 to 25 kHz) and satisfying efficiencies, reaching 98.7% at nominal power. Moreover, interleaved operation leads to high quality of input and output waveforms despite relatively small passive components, Thus, the system can be competitively employed against common IGBT solutions.