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<p>To meet the requirement for constant current (CC) control followed by constant voltage (CV) control in lithium-ion battery charging, this paper proposes a magnetically coupled resonant wireless power transfer (MCR-WPT) system employing an LCC/LC-S composite compensation topology. A single primary-side power switch enables seamless CC-CV mode transitions. The system incorporates a compact, integrated coupling mechanism with high spatial efficiency and a simple mode-switching control strategy, while its output range remains independent of the loosely coupled transformer (LCT) parameters. The design methodology of the integrated coupling mechanism is presented, along with the derived conditions for CC-CV switching and the parameter calculation methods for the compensation network. Simulation results show that CC output is achieved under the zero-phase angle (ZPA) condition, and CV output is achieved under the zero-voltage switching (ZVS) condition. An experimental prototype with a 48 V DC input delivers a 3 A CC output and a 35 V CV output, achieving maximum transmission efficiencies of 90.5% and 86.9%, respectively. Experimental results verify both the feasibility of the proposed scheme and the accuracy of the theoretical analysis.</p>

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Integrated MCR-WPT system with LCC/LC-S hybrid compensation for constant-current/constant-voltage operation

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Yu Zhu,
  • Xiaojuan Xu,
  • Jin Luo,
  • Hao Shen

摘要

To meet the requirement for constant current (CC) control followed by constant voltage (CV) control in lithium-ion battery charging, this paper proposes a magnetically coupled resonant wireless power transfer (MCR-WPT) system employing an LCC/LC-S composite compensation topology. A single primary-side power switch enables seamless CC-CV mode transitions. The system incorporates a compact, integrated coupling mechanism with high spatial efficiency and a simple mode-switching control strategy, while its output range remains independent of the loosely coupled transformer (LCT) parameters. The design methodology of the integrated coupling mechanism is presented, along with the derived conditions for CC-CV switching and the parameter calculation methods for the compensation network. Simulation results show that CC output is achieved under the zero-phase angle (ZPA) condition, and CV output is achieved under the zero-voltage switching (ZVS) condition. An experimental prototype with a 48 V DC input delivers a 3 A CC output and a 35 V CV output, achieving maximum transmission efficiencies of 90.5% and 86.9%, respectively. Experimental results verify both the feasibility of the proposed scheme and the accuracy of the theoretical analysis.