因應近幾年來電動車的崛起，為了使充電更加的便利、安全，能夠使用無線功率傳輸來達成目的。本論文中首先分類不同的無線功率傳輸方式，介紹各個種類的優缺點與特性，並使用磁場耦合式無線功率傳輸作為研究之主題。接著應用等效模型來分析線圈之間耦合的電路參數，再來選擇串聯諧振式為主架構，使用此架構分析在不同工作點下的優缺點。為了因應實際系統運作時線圈之間距離變化且顧及電路效率，需要設計與一般串聯諧振式轉換器不同之控制方式。
透過分析與設計，並且參考SAE J2954 WPT 2/Z3規範中的輸出功率、線圈之間移動量規格，最後實作出一8 kW之串聯諧振式無線功率傳輸系統。此系統接收與發射線圈距離可於200 mm~280 mm之間，且X軸與Y軸各有0~75 mm、0~100 mm之偏移量能夠自由移動並能正常運作。線圈距離200 mm、無偏移量時最高效率可達97%，線圈距離 280 mm、X軸偏移量75 mm、Y軸偏移量100 mm最高效率可達95.2%。

In recent years, with the rise of electric vehicles, in order to make charging more convenient and safe, wireless power transfer can be used to achieve their goals. In this thesis, we first classify different wireless power transfer methods, introduce the advantages, disadvantages and characteristics of each category, and use magnetic field coupling wireless power Transfer as the research topic. Then apply the equivalent model to analyze the circuit parameters of the coupling between the coils. Select the series resonance type as the main topology, and use this topology to analyze the advantages and disadvantages at different operating points. In order to cope with the change in the distance between the coils when the actual system is operating and taking into account the circuit efficiency, it is necessary to design a control method different from the general series resonant converter.
Through analysis and design, and referring to the SAE J2954 WPT 2 / Z3 specifications for output power and the moving distance between coils, finally an 8 kW series resonant wireless power Transfer system was implemented. The distance between the receiving and transmitting coils of this system can be Between 200 mm and 280 mm, and the X-axis and Y-axis each have an offset of 0 ~ 75 mm and 0 ~ 100 mm, and can move freely and operate normally. When the coil distance is 200 mm, without offset, the efficiency can reach 97%, when the coil distance is 280 mm, the X-axis offset is 75 mm, and the Y-axis offset is 100 mm, the efficiency can reach 95.2%.

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