All-GaN Bidirectional ANPC-based Resonant DC-DC Converter

This paper presents an isolated all-GaN resonant DC-DC converter using a HV ANPC and a LV full-bridge converter stage. The thermal characteristics and current limits as well as the switching behavior of the commutation cells of both converter stages are discussed. The ANPC-stage is tested with an output power of 1.8 kW operating as LLC converter, and the LV full-bridge is tested up to 27 A in a step-down DC-DC configuration. Measurement results of the resonant all-GaN LLC-converter are discussed and compared with simulation results.