A DAB-based single-stage AC-DC converter with optimized modulation strategy for wide output power range

This paper proposes an optimized modulation strategy for wide output power range with single-stage AC-DC converter based on dual-active-bridge (DAB) used to battery charging application, which can improve the converter performance under medium-load and light-load condition, and achieve natural power factor correction (PFC) function without inner current tracking loop. In this optimized control strategy, lookup tables are used to limit the range of control variables to obtain a wide output power range. Meanwhile the soft-switching conditions are given separately for the primary-side and secondary-side SiC mosfets of DAB. The experimental parameters are given and the simulation results show that the proposed optimized modulation strategy is feasible.