Phase Winding Configurations for Reduced Phase Current Ripple in a Multiphase Full-Bridge Inverter With Coupled Air-Core Magnetics

This paper presents an analysis of phase current ripple and output voltage ripple in a multiphase full-bridge inverter employing air-core magnetics. Various phase winding configurations with different extents of coupling and parallel interleaving are investigated. We demonstrate the potential for significant phase current ripple reduction by optimal selection of both the coupling coefficient and the relative phase shifts between phase windings. The proposed approach is experimentally validated on a four-phase, 2 MHz hardware prototype.