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. Steady-state 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.