New Third-Harmonic Injection Modulation Reducing the DC-Link Energy Buffer Requirement of Phase-Modular Three-Phase Isolated PFC AC/DC Converter Systems

Realizing an isolated three-phase AC/DC converter system with three front-end single-phase PFC rectifier modules referenced to a common star point allows low DC-link voltage levels of 400V in contrast to standard three-phase boost-type PFC rectifiers operating with a DC-link of 800V. Hence, the usage of superior 600V GaN switches instead of 1.2kV SiC MOSFETs and accordingly a high system efficienc...