一种采用最优开关策略的混合三级混合开关

Multilevel converter topologies can adapt to the development trend of higher voltage standard and higher power rating in aviation power systems. To accomplish high efficiency and great power density, the wide bandgap (WBG) device such as silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET) is employed. Nevertheless, the significant overall expense of all-SiC-based multilevel converters renders them uneconomical. In this article, a hybrid2 active neutral-point-clamped (ANPC) converter is proposed. It comprises only two Si/SiC hybrid switches, the rest four active switches are silicon (Si) insulate-gate bipolar transistors (IGBTs). The hybrid frequency modulation scheme is designed to transfer almost all the switching tasks to HySs. Furthermore, by experimental test and theoretical derivation, the switching characteristics of the Si/SiC hybrid switch (HyS) are analyzed in depth. Based on these, an optimal switching strategy for the HyS is proposed to reduce power losses, improve power handling capability, and ensure device security. A hybrid2 ANPC converter experimental platform is constructed and tested. Consequently, the proposed converter attains cost-effectiveness, high efficiency, and exceptional reliability, making it particularly advantageous for high-power inverters and rectifiers in the modern aviation industry.