Backflow Power Optimization of DAB Based on Asymmetric Duty Cycle and Internal Phase Shift Control

Dual active bridge (DAB) converter with single-phase-shifting (SPS) control would produce large backflow power when voltage regulation ratio deviates from 1 or under light load, an asymmetric duty cycle and internal phase shift (ADIPS) was proposed which controls the transmission by phase-shift can be eliminated load therefore improves efficiency of DAB converter. By establishing mathematical models inductor current power, working principle method given as well cause analyzed. The constraints zero optimization ADIPS presented. At last, experimental prototype is used to obtain validation results, simulation results verify excellent performance strategy in eliminating load.