本論文旨在研製一組被動式雜訊抑制器，用以抑制切換式電源供應器所造成之傳導雜訊。文中採用一個由被動元件所架構而成之被動式雜訊抑制器，共包含了一組感應線圈、兩個電阻、三個電容及一個二極體，其中感應線圈為一組與轉換器中固有變壓器初級側相同圈數之繞組。在設計與調整元件之理想參數值後，即達到抑制共模電流與差模電流之效用。此外，文中並針對緩振電路之雜訊抑制效果進行分析，俾結合之以更進一步抑制電磁雜訊干擾。藉由電路模擬分析與雜訊量測結果，可進一步確定本文所提之被動式雜訊抑制器能夠降低傳導性電磁干擾。

This thesis proposes a passive noise suppressor to suppress the noise produced by switched power supplies. The passive noise suppressor is composed of passive components. It consists of an induction winding, two resistors, three capacitors and a diode. In the noise suppressor, induction winding has the same turns as the inherent transformer primary side. Adjusting the ideal parameter value of device can reduce common-mode noise current and differential-mode noise current efficiently. Moreover, this thesis makes relevant analysis for suppression noise in snubber circuits. The suppressor combine the snubber circuits can reduce EMI efficiently. By the measuring results and circuit simulation analysis to verify the propose for decreasing EMI effectively.

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