This digest presents the design methodology of a modular double-bridge GaN sine-wave traction inverter for 400V DC supply. The design methodology uses an optimization procedure to find the best design candidate among many of design solutions that are generated using constraints on power, switching frequency, efficiency, power density (including EMI filter and sine-wave filters) and cost. The proposed methodology uses CISPR25 for the EMI filter design and relies on a realistic switching loss evaluation through Double Pulse Tests (DPT) of the selected GaN devices. The modular design allows direct parallel connection of inverters for power boosting. A 90 kW, 110 kHz GaN inverter is under prototyping. The digest presents preliminary evaluation results, while the final paper will include the experimental verification of the inverter prototype.
