Optimal Transformer Turn Design of LLC Resonant Converters for High Efficient Operation

초록

As the EV industry advances, the importance of enhancing the performance and optimizing the design of the Integrated Charging Control Unit (ICCU) in electric vehicles has grown significantly. To meet the demands for size reduction, weight reduction, and cost efficiency, while still delivering high performance and efficiency, research on resonant DC-DC converter topologies has been actively pursued. Among these, achieving high-efficiency operation in LLC resonant converters is important. This paper presents an optimal transformer design method for the LLC resonant converter, which is responsible for power conversion in the On-Board Charger (OBC). By analyzing power losses based on the transformer turns ratio and conducting FEM simulations, the optimal turns ratio was derived, improving the efficiency of the LLC converter. The performance of this method is validated through both simulations and experimental results.

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