An Integrated Buck-Boost DBSRC Cascade Converter with Wide Input Voltage Range

Dual bridge series resonant converter (DBSRC) is a new topology formed by adding series resonant capacitor on the basis of DAB converter. When phase shift control is used, the converter can achieve a wide voltage gain range, but the soft switch range of the switches will be limited. An integrated Buck-Boost DBSRC cascade converter (IBBDBSRC) with a wide input voltage range is proposed. The IBBDBSRC shares the four-switch Buck-Boost with the DBSRC's two switches, reducing the number of switches and reducing loss. In addition, for the IBBDBSRC converter, a fixed-frequency + dual-edge + single-phase-shift control strategy (FF-DE-SPS) is used to achieve ZVS of seven switches of the DBSRC. Principle of the converter are analyzed, the parameter design method of the converter is given and the ZVS condition of the switches is studied. Finally, simulation results are given to verify the correctness of the proposed circuit topology.