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<p>In this paper, a family of single-phase bridgeless back-to-back embedded five-level power factor correction (BEF-PFC) circuits is proposed. A back-to-back switching structure with a reverse series connection on the AC side is used to simplify the control complexity. The switching unit is embedded between the bridge arm and the midpoint of the split capacitor to realize a five-level voltage output. By optimizing the current path of the bidirectional switching, the circuit stability and the low voltage stress characteristics of the switching device are significantly improved. First, the BEF-PFC circuit characteristics are systematically analyzed and compared, and the working principle is elaborated in detail using BEF-PFC-I as an example. Second, PI double-loop control is adopted to ensure the sinusoidal characteristics of the inductive current. When combined with the in-phase carrier superposition SPWM modulation technique, five-level rectification can be realized by adjusting the pulse distribution, which reduces the modulation complexity. Finally, an experimental prototype with a rated output power of 1&#xa0;kW and an output voltage of 400&#xa0;V is constructed, and experimental results verify the high performance and effectiveness of the proposed topology.</p>

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Single-phase back-to-back embedded five-level PFC rectifiers based on simplified current path

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Kun Xiang,
  • Liping Fan,
  • Lingxi Yang,
  • Benling Yu,
  • Hui Ma

摘要

In this paper, a family of single-phase bridgeless back-to-back embedded five-level power factor correction (BEF-PFC) circuits is proposed. A back-to-back switching structure with a reverse series connection on the AC side is used to simplify the control complexity. The switching unit is embedded between the bridge arm and the midpoint of the split capacitor to realize a five-level voltage output. By optimizing the current path of the bidirectional switching, the circuit stability and the low voltage stress characteristics of the switching device are significantly improved. First, the BEF-PFC circuit characteristics are systematically analyzed and compared, and the working principle is elaborated in detail using BEF-PFC-I as an example. Second, PI double-loop control is adopted to ensure the sinusoidal characteristics of the inductive current. When combined with the in-phase carrier superposition SPWM modulation technique, five-level rectification can be realized by adjusting the pulse distribution, which reduces the modulation complexity. Finally, an experimental prototype with a rated output power of 1 kW and an output voltage of 400 V is constructed, and experimental results verify the high performance and effectiveness of the proposed topology.