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In response to the needs of high-power electric propulsion systems for power processing units that can adapt to a wide range of voltages and can achieve high-efficiency conversion throughout the range, this thesis plans to research on the technology of high-power electric propulsion wide-voltage power processing unit. This thesis proposes an isolated widevoltage flexible mainstream combined converter and its control method. By optimizing the number of series series on the secondary side of the dual-bridge topology, the stress of the device is reduced. By embedding a lossless spike absorption diode on the secondary side, the resonant voltage spike of the rectifier diode is effectively reduced. Through the optimized design of the smooth switching control strategy, the adjustment range of the converter is broadened. Through the control strategy of the in-phase shift switch of the leading bridge, the current sharing of the converter is realized and the power density of the converter is improved. The prototype developed in this thesis has an input voltage of 80-120V, an output voltage of 500-1500V, a rated power of 5kW, and a conversion efficiency of up to 95%, which verifies the correctness and effectiveness of the related technology.