Full-Bridge T-type Isolated DC/DC Converter with Wide Input Voltage Range

The advent of the silicon carbide (SiC) power device with high voltage stress would simplify the power converter's circuit structure for high voltage applications since two-level topologies would be possible to instead three-level (TL) based topologies. This paper proposes a full-bridge (FB) T-type isolated DC/DC converter composed of four main power switches with high voltage stress (SiC MOSFET) and four auxiliary power switches with low voltage stress (Si MOSFET). Therefore, comparing with the conventional diode-clamped FB TL isolated DC/DC converter, the proposed converter has fewer circuit components and simpler circuit structure. What is more, a corresponding control strategy is proposed, which can not only realize zero-voltage switching (ZVS) but also achieve wide input voltage range. Finally, simulation and experimental results are both presented for verification.