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<p>The three-coil wireless power transfer (WPT) system has the advantages of higher safety, reliability, and greater convenience. However, it exhibits the challenges of unnecessary cross-coupling, difficulties in frequency switching, zero-voltage switching (ZVS) operation, low output current/voltage, low spatial utilization, and high complexity on the receiving side in a three-coil WPT system. In this study, a three-coil WPT system with constant current (CC) and constant voltage (CV) outputs based on primary-side topology switching is proposed to address the issues of cross-coupling, frequency switching, ZVS operation, and low output current/voltage. First, the three-coil WPT system achieved CC (S-S-S topology) output and CV (LCC-S-S topology) output using the active decoupling of controlled sources method. Two AC switches on the primary side facilitated a smooth transition between CC and CV outputs. A comprehensive theoretical analysis of the output characteristics and zero-phase angle (ZPA) operational characteristics was provided, along with detailed parameter design methods for the system. Second, the sensitivity of variations in compensation component parameters affecting the CC and CV output characteristics was analyzed, accompanied by recommendations to further enhance ZVS operational performance. Lastly, an experimental prototype of the three-coil WPT system independently achieving CC and CV outputs was built. Results show that the proposed system can deliver a constant 6 A and a constant 110&#xa0;V output while meeting ZVS operational requirements during system operation.</p>

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Design and performance analysis of a dual-mode output three-coil WPT system based on primary-side topology switching

  • 期刊论文

  • 发表日期：

    2026年3月20日

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  • Pengcheng Pan,
  • Jianghao Xiao,
  • Qing Liu,
  • Peirong Ji

摘要

The three-coil wireless power transfer (WPT) system has the advantages of higher safety, reliability, and greater convenience. However, it exhibits the challenges of unnecessary cross-coupling, difficulties in frequency switching, zero-voltage switching (ZVS) operation, low output current/voltage, low spatial utilization, and high complexity on the receiving side in a three-coil WPT system. In this study, a three-coil WPT system with constant current (CC) and constant voltage (CV) outputs based on primary-side topology switching is proposed to address the issues of cross-coupling, frequency switching, ZVS operation, and low output current/voltage. First, the three-coil WPT system achieved CC (S-S-S topology) output and CV (LCC-S-S topology) output using the active decoupling of controlled sources method. Two AC switches on the primary side facilitated a smooth transition between CC and CV outputs. A comprehensive theoretical analysis of the output characteristics and zero-phase angle (ZPA) operational characteristics was provided, along with detailed parameter design methods for the system. Second, the sensitivity of variations in compensation component parameters affecting the CC and CV output characteristics was analyzed, accompanied by recommendations to further enhance ZVS operational performance. Lastly, an experimental prototype of the three-coil WPT system independently achieving CC and CV outputs was built. Results show that the proposed system can deliver a constant 6 A and a constant 110 V output while meeting ZVS operational requirements during system operation.