Dynamic analysis of loss-limited switching full-bridge DC-DC converter with multimodal control

Full-bridge DC-DC converters with one soft-switched leg and one hard-switched leg have been introduced as an attractive approach for realizing high-frequency power conversion at power levels greater than 100 kW. This paper presents a new variable-frequency multimodal control strategy for these converters for obtaining optimal operating characteristics. The controller extends the soft-switching operating region of the converter while lowering magnetic component core loss. Steadystate and dynamic analyses of the converter operation in the various modes are developed. Simulation and experimental results verifying the operation of the converter are presented.