Asymmetrical ISOP LLC Resonant Converter with Integrated Transformer for High Voltage Distributed DC Power System

The multi-module symmetrical input-series outputparallel (ISOP) resonant converter demonstrates potential in mitigating high input voltage stress in distributed DC power systems. However, excessive module integration introduces significant drawbacks, including increased magnetic component size and additional requirements for peripheral power and driving circuits. To address these limitations while improving power density and optimizing device voltage stress distribution, this study investigates an asymmetric ISOP resonant converter utilizing hybrid Si/SiC devices. Key contributions include the design and optimization of an asymmetric planar integrated transformer, along with current sharing optimization for parallel PCB windings to enhance conversion efficiency. Experimental validation through a prototype implementation confirms the superior performance of the proposed asymmetric topology in terms of both power density and efficiency.