本論文旨在雙環同軸型線圈耦合結構上，結合感應式與電容式無線電能傳輸技術，實現可雙頻操作之混合式無線電能傳輸系統。首先考量耦合結構中雙環線圈間的連接方式，接著運用等效電路模型分析複合式耦合結構在不同操作頻率下，利用磁場與電場傳輸的實功率比例關係。為了使雙環線圈在特定諧振頻率275 kHz時，主要以電場進行無線傳能，本文於接收端內外環線圈間加入並聯諧振電路。最後設計了結合S-S與雙邊LC之混合式雙頻諧振補償網路，藉此在全橋變流器的輸出基本頻率25 kHz、高次諧波頻率275 kHz下，分別進行感應式與電容式無線傳能。經由實驗量測在複合式耦合結構間距5 mm下，系統可達最大輸出功率為1077 W，此時系統傳輸效率為91.2 %。

This thesis is aimed to combine inductive and capacitive wireless power transmission technologies on the double-ring coaxial-coil type coupling structure. To realize a dual-frequency hybrid wireless power transfer system. First, we consider the connection pattern between double-ring coils in the coupling structure. Next, we used the equivalent circuit model to analyze the proportional relationship of the real power transmitted by the magnetic field and electric field in the composite coupling structure at different operating frequencies. In order to make the coupling coil conduct wireless power transfer mainly through electric field under the specific resonant frequency of 275 kHz, the parallel resonant circuit is added between the inner and outer loop coils of the receiving terminal. Then, a hybrid dual-frequency resonance compensation network combining S-S and double-sided LC is designed to perform inductive and capacitive wireless power transfer at the fundamental frequency (25 kHz) and higher harmonic frequency (275 kHz) of the H-bridge inverter respectively. Finally, experimental results showed that the system can achieve 1077 W output power with 91.2% efficiency within a distance of 5 mm.

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