An Integrated DAB–LLC Resonant Converter With Extended ZVS Operation Over the Full Load Range

作者：Yoo-Seop Kim, Yeong-Jun Choi · 发表于：2026 8th Asia Energy and Electrical Engineering Symposium (AEEES) · 年份：2026 · DOI：10.1109/AEEES69423.2026.11556602

In this paper, an integrated DAB–LLC resonant converter is proposed to effectively utilize the advantages of the Dual Active Bridge (DAB) converter and the LLC resonant converter according to load conditions. The DAB converter exhibits a simple control structure and high power transfer capability in the heavy load condition. However, efficiency decreases under light load conditions due to difficulty in maintaining zero voltage switching (ZVS). To overcome this limitation the ZVS operating region of a DAB converter based on the Single Phase Shift (SPS) modulation technique is analyzed by considering the MOSFET output capacitance. The proposed converter transitions the operating mode to an LLC resonant converter in the light load condition where ZVS cannot be achieved, thereby ensuring ZVS operation over the entire load range. Seamless mode transition without overcurrent or overvoltage is verified through Hardware in the Loop (HIL) simulation.