Research On A Single-primary-winding Double-input Full-bridge Converter With Soft-switching

Nowadays, energy crisis and environmental pollution are becoming more and more serious. Renewable energy has been receiving more and more attention from human beings. Multiple-Input Converter(MIC) is the most important part of the renewable power system. The single-primarywinding MIC is novel and practical among the MICs. This paper focuses on the research of the Buck-derived single-primary-winding double-input full-bridge converter.In the thesis, the operating principles and fundamental control strategies of the converter are firstly introduced. Based on the control strategies, a novel soft-switching control strategy is proposed. The operation principle of the control strategy is fully illustrated and analyzed. Compare to the proposed soft-switching methods for full-bridge converters, the novel control strategy can easily realize zero voltage switching over a wide range of the load without any auxiliary circuits. Then, an energy management strategy for the system is proposed to utilize the renewable energy as much as possible. The controlling system is based on TMS320F28335 platform. Steps of close-loop design are introduced to guarantee the dynamic performance under different modes of operation. The flow chart of programs is also given in the thesis.Lastly, the simulation model has been built in the Saber and PLECS and a 600 W prototype has been designed, built and tested in the lab. Both simulation results and experiment results verify the theoretical analysis and the effectiveness of the control strategy.