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<p>Secondary-side control (SSC), which is free from wireless communication, has high robustness with local control in wireless power transfer (WPT) systems. However, conventional SSC methods make it hard to balance the voltage gain and power density. This paper proposes a single-stage WPT topology with a wide voltage regulation range through a simple variable duty-cycle control that is especially suitable for low voltage output WPT applications with SSC. The proposed topology utilizes a buck-multiplexed rectifier (BMR) to achieve a high step-down voltage gain and SSC effect. The operation mode and principle are analyzed through switch function modeling and hybrid commutation path deduction. This paper establishes a system voltage transfer function model, explaining the reason for the additional step-down voltage gain at the proposed single power stage. Using an LCC-S compensated system as an example, the signal conditioning circuit and digital control method are designed and a 200&#xa0;W prototype BMR-WPT system is developed. Experimental results validate the effectiveness of the BMR topology and its voltage gain control strategy. It can be seen that its normalized voltage gain is lower than that of traditional full bridge uncontrolled rectifier.</p>

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Single-stage high-gain wireless power transfer converter based on secondary-side buck multiplexed topology

  • 期刊论文

  • 发表日期：

    2026年3月16日

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  • Mingfei Ban,
  • Yingkai Liu,
  • Zhenjie Li

摘要

Secondary-side control (SSC), which is free from wireless communication, has high robustness with local control in wireless power transfer (WPT) systems. However, conventional SSC methods make it hard to balance the voltage gain and power density. This paper proposes a single-stage WPT topology with a wide voltage regulation range through a simple variable duty-cycle control that is especially suitable for low voltage output WPT applications with SSC. The proposed topology utilizes a buck-multiplexed rectifier (BMR) to achieve a high step-down voltage gain and SSC effect. The operation mode and principle are analyzed through switch function modeling and hybrid commutation path deduction. This paper establishes a system voltage transfer function model, explaining the reason for the additional step-down voltage gain at the proposed single power stage. Using an LCC-S compensated system as an example, the signal conditioning circuit and digital control method are designed and a 200 W prototype BMR-WPT system is developed. Experimental results validate the effectiveness of the BMR topology and its voltage gain control strategy. It can be seen that its normalized voltage gain is lower than that of traditional full bridge uncontrolled rectifier.