Power-Loss Characterization and Reduction of the 750-V 100-KW 16-KHz Dual-Active-Bridge Converter With Buck and Boost Mode

This article presents an advanced method for power-loss breakdown of a high-power bidirectional isolated dual-active-bridge (DAB) dc-to-dc converter using SiC-<small>mosfet</small>/SBD H-bridge modules. This method is so simple and practical as to extract a switching loss from accurately measured overall losses. A test bench designed and built in this article is characterized by cascading the two identical 750-V 100-kW 16-kHz DAB converters equipped with the two identical unity-turns-ratio transformers. The test bench allows power-loss breakdown at buck and boost operation. When a dc-input voltage of 750&#x00A0;V is different from a dc-output voltage of 850&#x00A0;V at 100&#x00A0;kW and 16&#x00A0;kHz, &#x201C;hybrid&#x201D; phase-shift control makes the overall power loss lower by 158&#x00A0;W than &#x201C;pure&#x201D; phase-shift control.