本論文旨在四線圈式無線電能傳輸系統之匹配特性研究，並利用多環同軸型線圈之方式提升體積利用率與水平偏移容忍度。透過四線圈式架構進行大間距之電能傳輸，同時針對繞製出的耦合結構進行參數量測，根據理論推導四線圈結構之相關參數並進行阻抗匹配，以實現耦合結構傳輸能力提升之目的。文中運用 Maxwell磁場模擬軟體分析不同線圈結構其磁場強度差異，依據模擬結果設計出本文之耦合結構，並藉由四線圈式等效模型分析諧振特性，計算本文所需之諧振參數。最後經實驗量測結果可得知，匹配後之耦合結構傳輸效率明顯高於未匹配之效率，當共振線圈間距離為1 m，經匹配後整體系統最佳傳輸效率約35.2%，最大輸出功率約50.4 W。

This thesis is to study the on matching characteristics of four-coil type wireless power transfer system, and uses multi-ring coaxial coils to enhance the volume efficiency and horizontal offset tolerance. The system can transmit great spacing power through the four-coil structure. According to theoretical derivation of four-coil structure parameters and execute impedance matching, we can enhance transmitting capacity. This thesis analyzes magnetic field intensity of different coil structures with magnetic field simulation software. The proposed coupling structure is designed based on the simulated results, and the resonant characteristics are analyzed with four-coil equivalent model. Finally, the experimental results show that the efficiency of matched coupling structure is higher than that of non-matching coupling structure. The system efficiency is 35.2% while coil spacing is 1 m, and the maximum power is 50.4 W.

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