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<p>The proposed converter introduces a dual inductor dual capacitor (LCLC) resonant configuration by integrating the series inductance as the transformer’s leakage inductance and adding a parallel capacitor to the magnetizing inductance, enhancing power density and efficiency. Dual inductor capacitor (LLC) resonant converters used for alternating current to direct current (AC/DC) conversion are highly suitable for electric vehicle (EV) chargers due to their superior efficiency, high power density, and soft switching capabilities. This work increases power density by minimizing the size of the series inductor typically required in LLC converters through integration with the transformer’s leakage inductance. To control the output DC voltage, switching frequency control is utilized. However, the power factor of AC/DC resonant converters is generally poor. To improve the power factor, the proposed converter uses a boost converter at the front end, operating in discontinuous conduction mode (DCM) to achieve a unity displacement power factor. By sharing the same switches for both the power factor correction (PFC) and resonant stages, the converter is made more compact and cost effective. Furthermore, a bridgeless rectification technique is implemented to minimize the count of switching devices. The proposed topology and control strategy have been verified through hardware results on a 1500W LCLC AC/DC resonant converter with a 48 V, 30Ah lithium-ion (Li-ion) battery pack. This topology achieves high efficiency with zero voltage switching (ZVS), improved power factor, reduced component count, and a compact, cost effective design by sharing switches between PFC and resonant stages.</p>

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Design and Implementation of a Single Phase Resonant Converter with Natural Power Factor Correction for Onboard Electric Vehicle Charging Applications

  • 期刊论文

  • 发表日期：

    2026年3月6日

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  • C. Hrudhya Kurian,
  • C. Parag Jose

摘要

The proposed converter introduces a dual inductor dual capacitor (LCLC) resonant configuration by integrating the series inductance as the transformer’s leakage inductance and adding a parallel capacitor to the magnetizing inductance, enhancing power density and efficiency. Dual inductor capacitor (LLC) resonant converters used for alternating current to direct current (AC/DC) conversion are highly suitable for electric vehicle (EV) chargers due to their superior efficiency, high power density, and soft switching capabilities. This work increases power density by minimizing the size of the series inductor typically required in LLC converters through integration with the transformer’s leakage inductance. To control the output DC voltage, switching frequency control is utilized. However, the power factor of AC/DC resonant converters is generally poor. To improve the power factor, the proposed converter uses a boost converter at the front end, operating in discontinuous conduction mode (DCM) to achieve a unity displacement power factor. By sharing the same switches for both the power factor correction (PFC) and resonant stages, the converter is made more compact and cost effective. Furthermore, a bridgeless rectification technique is implemented to minimize the count of switching devices. The proposed topology and control strategy have been verified through hardware results on a 1500W LCLC AC/DC resonant converter with a 48 V, 30Ah lithium-ion (Li-ion) battery pack. This topology achieves high efficiency with zero voltage switching (ZVS), improved power factor, reduced component count, and a compact, cost effective design by sharing switches between PFC and resonant stages.