本論文研究電動車無線感應電能傳輸系統之效率，分析其頻率響應與改進設計。有關此項之研究至目前為止多為針對系統電路參數設計與感應線圈之耦合結構設計，對於感應線圈與補償電容的補償架構之效率轉換研究較有限，對於可操作頻帶區間內提升效率之設計方法亦付之闕如。因此本文藉由分析補償架構之等效模型，進行推導系統非諧振點頻帶之轉換效率公式，並參照SAE J2954感應充電規範與建議標準，在頻率區間為81.38 kHz至90 kHz中，提出最佳調整補償電容之設計流程，提升系統轉換效率並增加實際可操作範圍之彈性，並兼具考慮系統之安全性。搭配周邊電路與研製氣隙為20 cm的非接觸式感應耦合傳能平台，驗證本文所提出之提升效率方法。實驗結果顯示，當操作頻率為86 kHz，輸入功率為468.98 W，輸出功率為434.47 W，系統電能傳輸效率為92.64 %；調整操作頻率為90 kHz時，系統效率為93.65 %；操作頻率為81 kHz時，系統效率則為91.46 %，因此本文所發展之方法具有相當實用性與參考性。

In this thesis, we investigate the efficiency of inductive wireless power transfer (WTP) systems for electric vehicles in terms of frequency response analysis and the design method. Up to present, most relevant WPT studies were about designing system circuit parameters and designing coupled structures of induction coils. Research on the efficiency of the power conversion from compensation topology composed of induction coils and compensational capacitors is lacking. Study on design methods to increase the efficiency within the operational frequency band range is nonexistent. However, through the equivalent circuit model of compensation topology, this study has derived a conversion efficiency formula for a non-resonant point frequency band in a system. With reference to the inductive charging specification and recommendation in SAE standard J2954 in the frequency band range between 81.38 kHz to 90 kHz, a design process for optimal compensation capacitors was proposed for raising system conversion efficiency, increasing actual operable range, and for system safety consideration. To verify the enhanced method for system conversion efficiency proposed in this article, some collocating peripheral circuits and an inductively coupled contactless energy transfer platform with a 20 cm air gap were used. The experimental data showed that when the operating frequency is 86 kHz, input power is 468.98 W, output power is 434.47 W, and the system power transfer efficiency is 92.64 %. When the operating frequency is adjusted to 90 kHz, the system efficiency increased to 93.65 %. When the operating frequency is 81 kHz, the system efficiency is 91.46 %. This new method is both practical and informative.

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