This digest introduces a high-efficiency resonant dc-dc converter architecture utilizing resistance compression network (RCN) with synchronous rectifiers at its output. RCN is a power splitting network with two equal and opposite impedances which can enable simultaneous zero-voltage switching and near zero-current switching across a wide load range. A phase-shift control strategy is proposed for this converter to achieve soft-switching of its rectifier and inverter transistors. A systematic design methodology to ensure high efficiency operation across wide output voltage range is also presented. A 300-W, 12-V input, 200-400-V output, 400-kHz GaN-based RCN prototype converter with synchronous rectifiers is designed, built, and tested.
