本文提出一混成式扼流圈(Hybrid Choke)，可減少濾波器電路之元件數量、體積與成本。文中首先針對電磁干擾來源、耦合路徑與量測技術的簡介，並說明傳統型濾波器之原理與設計流程。再以20W返馳式之電源適配器(AC Adaptor)為例，分為2pin與3pin類型，探討其雜訊干擾來源與耦合路徑。依據電路雜訊等效模型，進行差模雜訊之傅立葉頻譜圖模擬與估算，再與硬體電路之雜訊量測數據相互驗證。文中先設計傳統型濾波器加入於主電路後，其可達到量化衰減雜訊之效果，故可驗證設計之正確性。最後，設計一混成式扼流圈之濾波器加入於主電路，可得其雜訊衰減能力與傳統式濾波器相同，並可改善傳統式濾波器缺點，進而達到共模電感與差模電感整合之目的。

The main theme of this thesis is to design and implement a hybrid choke. Firstly, the electromagnetic interference source, coupling path, and the measurement methodology are briefly introduced, and the principles and design process of traditional filter are also examined. The design procedure of the proposed hybrid choke is addressed in detail in this thesis. Secondly a 20W Flyback AC adaptor is implemented to test the feasibility of the developed circuit. The noise interference source and coupling path of 2pin-type and 3pin-type chokes are explored. The Fourier spectrum for differential-mode noise is simulated and estimated based on the equivalent circuit, and a traditional filter is also implemented. The experimental results show that using the hybrid choke, the components, size and cost are decreased and the conductive EMI noise is restrained effectively.

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