本論文針對切換式電源之傳導性電磁干擾做一研究。分別針對雜訊源、傳導路徑與其傳導阻抗，以及濾波器的設計，這三個方向來做分析。
在雜訊源部分，使用傅立葉轉換分析其雜訊源之頻譜，探討雜訊訊號之上升、下降斜率，以及其脈波寬度分別對於雜訊頻譜上的表現。在傳導路徑部分，介紹差模與共模干擾之傳導路徑與平衡電容之功用。而在傳導路徑阻抗的量測方面，分別引用兩篇文獻：輸入及反射電流探棒量測法與傳輸參數量測法。針對此兩種方式，補充一詳細且完整原理分析的數學推導，並評比了兩種方式的優缺點。
然而，在實際實驗驗證中，傳輸參數量測法所量測之結果不符合理論之推導且具有大量之雜訊。在無法釐清是否為量測儀器的問題或量測平台的問題下，研究方向轉為使用模擬軟體的方式來進行轉換器的傳導路徑阻抗的量測。
在模擬軟體的實驗環境中，本論文提出另一簡易式傳導路徑阻抗量測法。其方法僅需量測兩個電壓與兩個電流訊號，即可反推出傳導路徑阻抗與雜訊源的分量。與既有文獻的量測方式相比，因不須使用網路分析儀，以及繁雜的數學轉換。所以本文提出之簡易式量測法具有低成本與高可靠性之優點，並在本論文中以數學與模擬相互驗證，證明此方法的正確性。
本論文最終提出一濾波器設計流程，依據由本文所提出之簡易量測法所求得知傳導路徑阻抗為依據，使用插入損失的概念，逐步的由理論選擇合適的濾波器形式、濾波器設計的方法。最終提供一設計範例以供讀者參考。其理論計算與模擬結果相互吻合。

This thesis is to provide an analysis of noise source of conductive electromagnetic interference. Then the thesis divides into three directions: Noise source, conduction path, noise source impedance, and filter design.
In the part of noise source, this thesis use Fourier transform to observe the noise source in frequency domain and analyze the noise source results by changing its rise time, fall time, and bandwidth. In the part of conduction path, this thesis introduce the DM mode, CM mode, and the function of balance capacitor. In the part of noise source impedance, this thesis introduce two papers of measuring the noise source impedance: The direct clamping two-probe measurement and ABCD parameters applying in a noise source impedance extraction method. Add complete details of calculation, figure, advantages, and disadvantages of these two papers.
However, according to the experiment results, the way of ABCD parameters applying in a noise source impedance extraction method can’t match the calculation method and has a lot of noise on the results. Because the problems of results can’t find the reasons coming from the device or measurement, the research direction changes to use simulation to measure the noise source impedance.
In the simulation, this thesis provide a simplify noise source impedance extraction method that needs only two voltage and current signals to get the noise source and noise source impedance. The difference between the simplify noise source impedance extraction method and ABCD parameters applying in a noise source impedance extraction method is that the simplify noise source impedance extraction method doesn’t need to use Vector Network Analyzer and hasn’t the complex calculation. So the advantages of the simplify noise source impedance extraction method are low cost and high reliability, and this thesis proves the correctness of this method by verifying results between calculation and simulation.
Finally, this thesis provides the process of filter design that finished by using insertion loss that needs noise source impedance coming from the simplify noise source impedance extraction method. And the reason how to choose filter is explained step by step in this thesis. The final results between calculation and simulation are matched.

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