关键词: 微特电机, 双有源桥拓扑, 最优移相比, 电流内环控制, 暂态响应优化

Abstract: In micro motor drive control systems, large current stress is often generated during high-frequency modulation of dual active bridge ( DAB) converters. This stress causes temperature rise of power devices, shortens their lifespan, and reduces system stability under load disturbances. An improved dual phase shift modulation strategy is proposed. The method is based on the dual active bridge topology. A power transmission model and a current stress model under dual phase shift are established. The optimal phase shift combination is solved using the lagrange multiplier method. Analytical expressions of current stress under different power levels are further derived. In the controller design,an inductor current inner-loop compensation mechanism is introduced. The system’ s dynamic response to load changes during motor operation is improved. Simulation results in MATLAB / Simulink show that the proposed method reduces current stress of the DAB converter under typical motor load conditions. The transient response time is shortened. The output voltage ripple is also reduced. The method provides theoretical support for the optimized design of high-performance power supply modules in motor drive systems.

Key words: micro motor, dual active bridge topology, optimal phase shift, current inner-loop control, transient response optimization