本論文旨在實現空間中全方位無線電能傳輸之能力。研製近無指向性無線電能傳輸系統，以提供位於該空間中環形區域內所有電子設備電能供給。為了達成近乎全方位傳能之能力，本論文提出正交結構的Tx端線圈，並結合四線圈架構以提升整體系統無線傳輸距離。在Rx端線圈設計部分採環形線圈，以降低耦合結構厚度，提高實用性。文中使用四線圈等效電路模型分析其諧振特性，並搭配電路模擬軟體Simplis驗證其可行性。透過數學建模方式了解正交線圈於空間中所產生之磁場，運用磁場模擬軟體協助了解其磁場分布情形，且分析Tx端饋電線圈與第一共振線圈擺放角度所造成之影響關係。最後經由實驗量測得知，本文所研製之近無指向性無線電能傳輸系統能對於幾乎整個環形空間內所有Rx端傳送能量，並且在間距40 cm內傳輸效率幾乎都能保持在30 %以上。

This thesis is aimed to realize nearly omnidirectional wireless power transfer capability to spatial free positioning charging. The quasi-omnidirectional wireless power transfer system is designed to provide power for all equipment located in the annular space. In order to achieve omnidirectional power transfer capability, the orthogonal Tx coils is proposed, combined with a four-coil structure to improve the transmission distance. Ring coil structure is adopted in the Rx coils in order to reduce the thickness of the coupled structure and improve practicability. The characteristics of resonant circuit are analyzed by using a four-coil equivalent circuit and circuit simulation software (Simplis). We used mathematical modeling and magnetic field simulation software to analyze the magnetic field generated by the orthogonal coil and the angle relationship between the transmit coil and the primary resonant coil. Finally, experimental results show that the quasi-omnidirectional system proposed in this thesis can transmit energy to all receive coil in almost entire annular space and the transmission efficiency can be maintained at more than 30% at distance of 40 cm.

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