本論文針對車用無線電力傳輸系統金屬異物檢測，研製一套基於平衡線圈阻抗變化之金屬檢測系統。此系統利用金屬放置在高頻交變磁場中，因渦流效應造成鄰近的磁場削弱，使設置在發射線圈的檢測線圈的阻抗產生變化。利用串並聯等效電路及運算放大器，將阻抗變化轉換成電壓訊號，因而準確檢測出金屬異物混入能量傳輸區域。本論文有別於一般檢測線圈陣列系統，透過阻抗變化檢測，提高檢測的靈敏度及範圍。
本論文利用 ANSYS Maxwell 3D軟體建立無線充電線圈及檢測線圈，並結合simplorer模擬軟體建立全橋換流器及LCC補償架構進行磁電耦合，透過實驗結果比較，達成無線電力傳輸過程中，檢測金屬異物混入時，能立即停止無線傳能。
關鍵字: LCC補償、無線充電、金屬異物、渦流效應

This thesis proposes a new metal object detection (MOD) technique for wireless power transfer system. In such a system, when metal pieces are placed in high frequent alternating magnetic field, it causes changes of magnetic field and impedance of detection coil. The detection system is formed with series-resonant circuit, parallel-resonant circuit and operating amplifier in order to turn impedance changes into voltage signal and detect foreign metal bodies precisely in wireless power transfer process. This thesis applies ANSYS Maxwell 3D software to build up the models of transmitting/receiving coils and detection coils. SIMPLORER simulation software is then used to set up a full bridge inverter and LCC compensation topology to proceed electromagnetic coupling. Finally, a 1 kW prototype circuit of LCC wireless power transfer system (WPTS) is implemented and the feasibility of the proposed metal object detection technique is validated.

Keyword: Metal Object Detection, Eddy Current Effect, Wireless Power Transfer, Alternating Magnetic Field

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