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<p>This paper introduces a high-performance and highly-efficient isolated current-fed AC–DC resonant converter that attains negligible input current ripple, output voltage regulation, and near-unity power factor within a single-stage configuration. The topology prominently features the incorporation of a voltage bidirectional two-quadrant (VBTQ) switch positioned between the resonant inductor and the voltage-doubler circuit on the secondary side. The VBTQ switch facilitates independent control of output voltage and input current, allowing the primary-side switches to operate at a constant 50% duty cycle, thus significantly reducing input current ripple and eliminating the necessity for a filter inductor. Moreover, unlike other resonant converters, the proposed design employs simple pulse-width modulation (PWM) for control, which significantly simplifies both its implementation and operation. The duty cycle of the VBTQ switch effectively regulates output and improves the power factor. A 1.2 kW hardware prototype exhibits outstanding performance, attaining 96.0% efficiency, a power factor of 0.998, and a stabilized 380 V DC output. Additionally, soft-switching is achieved across all devices at a switching frequency of 50 kHz, featuring zero-voltage turn-on and zero-current turn-off, thereby enhancing efficiency.</p>

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Efficient and Ripple Free AC–DC Resonant Converter with Power Factor Correction Capability

  • 期刊论文

  • 发表日期：

    2026年6月20日

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  • Waqar Uddin,
  • Kamran Zeb,
  • Adnan Saeed,
  • Muhammad Majid Gulzar,
  • Muhammad Khalid

摘要

This paper introduces a high-performance and highly-efficient isolated current-fed AC–DC resonant converter that attains negligible input current ripple, output voltage regulation, and near-unity power factor within a single-stage configuration. The topology prominently features the incorporation of a voltage bidirectional two-quadrant (VBTQ) switch positioned between the resonant inductor and the voltage-doubler circuit on the secondary side. The VBTQ switch facilitates independent control of output voltage and input current, allowing the primary-side switches to operate at a constant 50% duty cycle, thus significantly reducing input current ripple and eliminating the necessity for a filter inductor. Moreover, unlike other resonant converters, the proposed design employs simple pulse-width modulation (PWM) for control, which significantly simplifies both its implementation and operation. The duty cycle of the VBTQ switch effectively regulates output and improves the power factor. A 1.2 kW hardware prototype exhibits outstanding performance, attaining 96.0% efficiency, a power factor of 0.998, and a stabilized 380 V DC output. Additionally, soft-switching is achieved across all devices at a switching frequency of 50 kHz, featuring zero-voltage turn-on and zero-current turn-off, thereby enhancing efficiency.