Optimal LLC Converter Design with Topology Morphing Control for Wide Voltage Range Battery Charging Applications

This paper presents the design and simulation of an LLC resonant converter with topology morphing control for wide voltage range battery charging applications. Conventional LLC converters provide high efficiency and soft switching capability, but they suffer from limited gain range when operating under wide input voltage variations. To overcome this limitation, a topology morphing technique is used to improve the gain char- acteristics and maintain efficient operation over a wide voltage range. In the proposed system, a boost converter is used to regulate the input DC voltage and provide a stable DC link to the resonant converter. The system is developed in three stages: boost converter design, conventional LLC converter implementation, and topology morphing LLC converter modeling. A PI controller is used to regulate the output voltage by adjusting the switching frequency of the converter. The complete system is modeled and simulated using MAT- LAB/Simulink. Simulation results show improved voltage regula- tion, extended gain range, and reduced switching loss compared to the conventional LLC converter. The proposed converter is suitable for battery charging, electric vehicle applications, and renewable energy systems.