Interleaved Bidirectional Buck-Boost DC-DC Converter Based on Multi-mode Control

With the continuous increase of the installed capacity of new energy power generation, the bidirectional DC converter has become a research hotspot. In this paper, the working principle of a non-isolated interleaved bidirectional Buck-Boost DC-DC converter with a wide input voltage range, a wide output voltage range and low ripple of output current is analyzed. Aiming at the problem of increased system loss caused by the loss of phase-shift control soft-switching when the voltage ratios on the primary side and the secondary side do not match, a three-mode switching control strategy is proposed in which the efficiency of the converter is improved by operating the converter in Buck, Boost and Buck-Boost modes. Finally, through matlab/simulink simulation and experiments, the feasibility and effectiveness of the proposed converter topology and control strategy are verified.