本文旨係提出一由共模變壓器、電容器及電阻器等被動元件所組成之被動式雜訊抑制電路，其特點在於利用共模變壓器代替電源轉換器內電感與變壓器，並與雜訊抑制電路中其他被動元件搭配達致抑制共模雜訊電流之效用。此外，文中尚針對緩振電路之雜訊抑制作用進行分析，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實測結果，證實本文所提被動式雜訊抑制電路確實有效地降低電源轉換器之傳導性電磁干擾。

This thesis presents the passive-type noise suppression circuit,
which is mainly composed of passive components, such as a
common-mode transformer, capacitors, and resisters. In the
passive-type noise suppression circuit, the common-mode transformer
is used to replace inductance or transformer in the power converter,
and passive components on the suppression circuit match each other in
order to achieve the utility which suppresses common-mode current.
Moreover, this thesis makes relevant analysis for suppression noise in
snubber circuits, and application of the suppression circuit cooperates
with snubber circuits can reduce EMI efficiently. In the measuring
results and circuit simulation analysis verify the purpose for
decreasing EMI effectively.

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