Development of Inverter Structure for Reducing Switching Loss Imbalance among Parallel Connection and among Three Phases

Abstract

Recently, SiC power devices were developed to reduce the size and weight of the power converter circuit. This paper presents a three-phase inverter structure for reducing imbalances in the switching loss among power modules connected parallel to one another and among the three phases. A proposed double-sided structure achieved an imbalance of less than 2% in the experimental switching loss using SiC power modules. In addition, it is shown that the double-sided structure realized stable switching behavior under four SiC power modules connected in parallel. K E Y W O R D Sparallel connection, silicon carbide, stray inductance, switching loss Electr Eng Jpn. 2020;212:59-66.