Design and Simulation of an Half-Bridge LLC Resonant Converter for Battery Charger in EV

This paper provides the various design steps for a resonant DC-DC converter with Half-Bridge Inductor-Inductor Capacitor (LLC) topology, which can be proposed to be utilized for battery charging applications in Light Electric Vehicles (LEVs). The proposed DC-DC converter is designed to transfer the maximum power from the DC Link (input voltage) to the battery. The output voltage is controlled using a proportional integral controller. In the proposed design approach, it is aimed to regulate the output DC voltage always at 58V DC corresponding to flexible input voltages ranging from 320V-420V, though rated voltage is 420V for rated output power of 696 Watt. The efficiency of the model does not experience much variation while operated at various input voltages, and therefore it can be a better choice for battery charging application. For example, the model can be used for charging a LiPO4 battery. The designed parameters are used in the simulation carried out on MATLAB/Simulink platform and simulation results validate the performances of the resonant converter satisfying the overall high efficiency.