Efficiency Evaluation of Si/SiC Hybrid Switches-Based Three-level ANPC Converter

In this paper, a highly efficiency three-level active neutral-point-clamped (ANPC) converter consisting of Si/SiC hybrid switches (HyS) based H-bridge structure and two Si IGBTs is proposed. The proposed converter is compared with other ANPC converters on the efficiency, such as the full Si IGBT-based ANPC converter and four HyS based hybrid ANPC (HANPC) converters. It is shown that the proposed converter can almost achieve the highest efficiency under the given conditions. The efficiencies of the HANPC-A and HANPC-B are close to each other, and about 0.11% lower than the proposed converter. The HANPC-C converter may achieve the highest efficiency at light load. The HANPC-D converter has lower efficiency, especially under low power factor load conditions, and it is suitable to the unity power factor loading conditions.