Minimum reflux power control of bidirectional DC-DC converter based on dual phase shifting

Abstract

For dual active-bridge full-bridge DC-DC converter, the traditional single-phase-shifting control is simple, but there is a backflow power, and only when the input voltage and output voltage match, the converter has higher efficiency. Therefore, in order to reduce the current stress and the reflux power, and improve the conversion efficiency, a dual phase-shifting control strategy with the minimum reflux power control satisfying the soft-switching condition is proposed. In this paper, the working mode, power characteristics and soft switching range of the dual phase-shifting control are analyzed firstly, and the best phase-shifting combination for realizing the minimum return power in the soft switching range is selected. Finally, the system model is established with the help of the simulation tool of MATLAB, which verifies the effectiveness and superiority of the control strategy.