LLC resonant converters are widely used in a variety of applications due to their simple structure and high power efficiency. In this study, we applied an Input-Series Output-Parallel (ISOP) config-uration to an LLC resonant converter with a current doubler rectifier (LLC-CDR) and verified its controllability and structural versatility. Simulation results confirmed that the ISOP configuration results in a smoother peak in the gain characteristics and a broader effective range for switching frequency control. Additionally, the integration of a common rectifier and a coupled inductor im-proves structural flexibility. These results indicate that the ISOP LLC-CDR is a promising power system with enhanced control performance under load variations.
