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<p>The ripple issue of single-stage power factor correction (PFC) converters cannot be ignored, and many ripple cancellation circuits (RCC) have been proposed including a structure with reduced redundant power processing (R2P2), but the efficiency still needs to be further optimized. In this paper, a peak voltage control (PVC) method for quasi-single-stage (QSS) PFC converter is proposed. PFC converters with the proposed PVC always adaptively extract the maximum value of their output voltage regardless of the ripple value, and can adaptively increase their average output voltage as the load becomes lighter, thereby reducing the proportion of power and current stress of the RCC, allowing more power to flow directly to the load. As a result, compared with the traditional average voltage control (AVC), the overall efficiency can be further improved and the electrolytic capacitors (E-caps) can be more reduced throughout the entire load range. The principle of efficiency optimization is given, and a ripple calculation method suitable for this structure is derived. Ultimately, a 48 V/96W flyback PFC prototype is developed to validate the proposed control, verifying the efficiency superiority of 1.18% increase under 90-265Vac input range in comparison with traditional AVC.</p>

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An Efficiency Optimization Method for Quasi-Single-Stage AC-DC Converter with Adaptive Peak Voltage Control

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Peng Bao,
  • Xue-Shan Liu,
  • Hong-Yan Wang,
  • Kun Lei,
  • Yu-Jie Feng

摘要

The ripple issue of single-stage power factor correction (PFC) converters cannot be ignored, and many ripple cancellation circuits (RCC) have been proposed including a structure with reduced redundant power processing (R2P2), but the efficiency still needs to be further optimized. In this paper, a peak voltage control (PVC) method for quasi-single-stage (QSS) PFC converter is proposed. PFC converters with the proposed PVC always adaptively extract the maximum value of their output voltage regardless of the ripple value, and can adaptively increase their average output voltage as the load becomes lighter, thereby reducing the proportion of power and current stress of the RCC, allowing more power to flow directly to the load. As a result, compared with the traditional average voltage control (AVC), the overall efficiency can be further improved and the electrolytic capacitors (E-caps) can be more reduced throughout the entire load range. The principle of efficiency optimization is given, and a ripple calculation method suitable for this structure is derived. Ultimately, a 48 V/96W flyback PFC prototype is developed to validate the proposed control, verifying the efficiency superiority of 1.18% increase under 90-265Vac input range in comparison with traditional AVC.