Advanced Control Strategies for Dual Active Bridge Converters

Abstract

Based on the traditional Single-Phase-Shift (SPS) modulation, the control method of Dual Active Bridge (DAB) converter is improved in this paper. By introducing the cross-conduction constraint mechanism in the secondary bridge arm, the overlapping conduction region of the switch is effectively limited, and the three-level voltage output is realized without introducing additional complex control strategies. The proposed method can significantly weaken the reverse component of the secondary current, thereby reducing the invalid circulating energy in the system. The simulation results show that the negative peak current decreases from − 54.7 A to − 9.7 A, indicating that the current waveform has been significantly optimized. In addition, the realization of zero-voltage switching (ZVS) is verified by simulation analysis. There is a measurable zero voltage interval before the device is powered on, which indicates that the soft switch is reliable. The reduction of circulating current and the enhancement of switching characteristics indicate the potential for performance improvement. This method provides a simple and effective solution for improving the current characteristics and switching conditions of high frequency DAB converter.