本論文旨在研究四線圈式多環同軸型感應耦合結構，並將其應用於大間隙無線電能傳輸系統。文中首先針對常見之大間隙用感應耦合結構進行模擬與分析，探討適用於大間隙無線電能傳輸之感應耦合結構，藉以提出本文之多環同軸型感應耦合結構。此外，為了提升系統電能傳輸效率，本文採用四線圈式感應耦合架構。而系統中運用電流感測電路偵測初級側諧振槽電流，並經由鎖相迴路調整系統之操作頻率，使其維持於初級側諧振頻率之上，達到初級側諧振頻率追蹤機制。最後，實驗結果顯示在間隙1公尺之下，最高電能傳輸能力為128瓦特，整體系統傳輸效率約為22.45%。

This thesis is to study the four-coil multi-ring coaxial type inductive coupled structure for wireless power transfer system. Firstly, different forms of coupling structures are simulated and analyzed, so as to propose multi-ring coaxial type inductive coupled structure applied in wireless power transfer system. Furthermore, in order to improve the power transmission efficiency, the strongly coupled magnetic resonances are chosen. The system uses current sensor to detect primary inductance current, and utilizes Phase-Locked Loop (PLL) to modulate operation frequency of system maintain on primary resonant frequency, thus achieve resonant frequency tracking mechanism. Finally, experimental results show that the highest power of load is 128 watts through 1 meter air gap, and the power transmission efficiency of the system is about 22.45%

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