Research on Soft-Switching Bi-directional DC/DC Converter for Hydrogen-electric Hybrid Vehicle

Traditional auxiliary power supply bidirectional DC/DC converter in hydrogen electric hybrid vehicle has the problems of high power tube loss and reverse recovery of parasitic diode. In order to solve these problems, this paper first improves its topology, adopts a non-isolated bidirectional Buck/Boost topology, and makes its two power switch tubes complementary on when working, realizes the zero voltage conduction of the power tube, and inhibits the reverse recovery of the parasitic diode of the power tube. Secondly, the analytical model of the converter is established by the modified state average method, and the two power switch tubes are uniformly controlled by the complementary control mode, which ensures the stable operation of the two-way flow of energy of the system. By using the built 1.2 Kw experimental prototype to verify, the obtained experimental waveform and data verify that the converter realizes soft switching, reduces power loss and improves conversion efficiency.