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<p>This paper proposes a design methodology that integrates the resonant inductor into a commercially available transformer for LLC converters operating above 0.5 MHz in OBC applications. The resonant network is designed for a 400 V battery system to validate the feasibility of the resonant frequency and operating frequency range. The required leakage and magnetizing inductances are achieved by shaping the transformer core geometry, with the design process guided and verified through FEA. As a result, the proposed method enables the realization of a compact, high-frequency LLC converter without the need for additional inductors. Experimental validation is conducted using a 7.2-kW prototype, demonstrating the effectiveness of the proposed transformer design.</p>

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Transformer Parameter Implementation Method for LLC Converter in On-Board Charger

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Jun-Ho Kim,
  • Geun Wan Koo

摘要

This paper proposes a design methodology that integrates the resonant inductor into a commercially available transformer for LLC converters operating above 0.5 MHz in OBC applications. The resonant network is designed for a 400 V battery system to validate the feasibility of the resonant frequency and operating frequency range. The required leakage and magnetizing inductances are achieved by shaping the transformer core geometry, with the design process guided and verified through FEA. As a result, the proposed method enables the realization of a compact, high-frequency LLC converter without the need for additional inductors. Experimental validation is conducted using a 7.2-kW prototype, demonstrating the effectiveness of the proposed transformer design.