Under dual phase shift control, the DC-DC converter of the hybrid three-level full bridge (H-TLFB) DC-DC converter has the problem of large reflux power and current stress. Thus two optimized control strategies of current stress optimization control and return power optimization control are proposed. First, this paper analyzes four working modes of the converter, derives the current stress and return power expression under different modes, solves the minimum current stress in the global area by comparison, the minimum return power corresponds to the optimal shift, and designs the corresponding optimization control strategy. Then it compares and analyzes the two optimized control strategies based on the same transmission power segment, finding that the two optimized control strategies can be optimized in the full power transmission. When 1/2＜p＜2/3, the optimization of the current stress of the two optimized controls is equivalent, and when 0＜p＜1/2, the two optimization controls are equivalent to the optimization of the return power. Finally, the effectiveness and correctness of the theoretical analysis are verified by experiment.

This work is supported by the National Natural Science Foundation of China (No. U1804143).