本論文旨係提出修正型EMI濾波器架構，用以抑制窄頻傳導雜訊。其電路主要由被動式元件組成，其中包含電感、電容與電阻等元件，籍由元件串並聯方式產生諧振，使其達到窄頻傳導雜訊抑制之效果。經由設計與調整元件之理想參數後，在不影響寬頻傳導雜訊抑制效果下，並可達到窄頻傳導雜訊共模電流與差模電流的衰減效果。藉由理論分析再搭配電路模擬與實驗量測的結果，可證明本文所提出的修正型EMI濾波器於窄頻傳導雜訊抑制方面，能有效地降低來自窄頻傳導雜訊之電磁干擾。

This thesis proposes the modified EMI filter for suppressing narrow-band conducted noise. The circuit consists of sorts of passive elements, including the induction winding, capacitors and resistors. By combining the passive elements in series and parallel to produce resonance, the modified EMI filter is made to achieve the narrow-band conducted noise suppression. By designing and adjusting ideal parameters of elements to produce resonance, it achieves to reduce common-mode noise current and differential-mode noise current efficiently of the narrow-band conducted suppression without affecting broad-band conducted noise suppression. This paper further provides to prove the modified EMI filter for suppression of narrow-band conducted noise, which can effectively reduce electromagnetic interference from the narrow-band conducted noise by theoretical analysis added with circuit simulations and results of measured experiments.

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