An isolated bi-directional soft-switched three-phase DC-AC matrix-based converter with novel unipolar SPWM and Synchronous Rectification

Abstract

This paper presents a novel unipolar SPWM-oriented modulation technique for the isolated bi-directional DC to three-phase-AC converter. The converter consists of a full bridge stage and a single-to-three phase matrix converter with high frequency link (HFL). With the proposed modulation technique, zero-voltage switching (ZVS) is realized for the full bridge and zero-voltage zero-current switching (ZVZCS) is realized for the matrix converter for all load range. Synchronous Rectification (SR) is achieved for switches operated in complementary and synchronous modes. In addition, the voltage spike induced by leakage inductance is mitigated with proposed modulation method without additional snubber circuits. Moreover, synchronous rectification is implemented to further improve the converter efficiency. The simulation results provided well validate the functionality and effectiveness of the proposed modulation technique.