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<p>To address the issues of constant current overcharging and constant voltage undercharging during the battery charging process, as well as the excessive number of components in existing wireless battery chargers (WBCs), this paper proposes a cost-effective and simple WBC with a minimal number of components. By configuring the rectifier, this system achieves both constant current (CC) and constant voltage (CV) outputs. The proposed charging control methods enable smooth transitions between the CC and CV charging modes with few components and no communication modules or state of charge detection. To achieve smooth switching and enhancing system efficiency, the parameters of the compensation components of the system are designed. Because the receiver compensation network has no mode conversion switch, this system is applicable to the wireless power supply field with higher requirements for power density. To validate the feasibility and effectiveness of the proposed scheme, a charger prototype with a capacity of 250&#xa0;V and 4&#xa0;A is constructed. Experimental results demonstrate that the WBC exhibits excellent CC and CV characteristics, meets charging requirements, and achieves a maximum system efficiency of 95.1%. </p>

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Cost-effective and simple wireless battery charger with reconfigurable rectifier

  • 期刊论文

  • 发表日期：

    2025年7月11日

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  • Shuyu Wang,
  • Hongchen Liu

摘要

To address the issues of constant current overcharging and constant voltage undercharging during the battery charging process, as well as the excessive number of components in existing wireless battery chargers (WBCs), this paper proposes a cost-effective and simple WBC with a minimal number of components. By configuring the rectifier, this system achieves both constant current (CC) and constant voltage (CV) outputs. The proposed charging control methods enable smooth transitions between the CC and CV charging modes with few components and no communication modules or state of charge detection. To achieve smooth switching and enhancing system efficiency, the parameters of the compensation components of the system are designed. Because the receiver compensation network has no mode conversion switch, this system is applicable to the wireless power supply field with higher requirements for power density. To validate the feasibility and effectiveness of the proposed scheme, a charger prototype with a capacity of 250 V and 4 A is constructed. Experimental results demonstrate that the WBC exhibits excellent CC and CV characteristics, meets charging requirements, and achieves a maximum system efficiency of 95.1%.