Future three-phase ac-dc converter systems ideally allow for a bidirectional power flow, provide high-frequency isolation, and feature buck-boost capability. This digest introduces a novel converter concept that employs three HB circuits on the input and output side and a low-complexity DAB-type modulation strategy, thereby enabling single-stage energy conversion. The main power component stresses are discussed and design guidelines for a 6.6 kW prototype system with an expected efficiency >98 % are presented. The final paper will further present alternative modulation strategies with reduced component stresses, as well as experimental waveforms recorded with an existing demonstrator system.
