COMPARISON OF ACTIVE TRANSFORMER RECTIFIER UNIT TOPOLOGIES FOR MORE ELECTRIC AIRCRAFT

An evaluation among different potentially suitable topologies for working as a Transformer Rectifier Unit (TRU) is performed in this paper. First, a qualitative analysis is done among literature topologies, resulting in Flyback and Dual-Active Bridge (DAB) as preselected suitable topologies for Regulated TRU (RTRU) operation. Considering More Electric Aircraft (MEA) context, both topologies are compared in terms of reliability, efficiency, semiconductor stress and converter volume. As result, a high-power isolated AC/DC Flyback topology based on phase-modular single-stage structure for MEA is presented, which operates as a RTRU and, hence, controls the output DC voltage to be 28 VDC for a three-phase 115 VAC input voltage (variable frequency).