臺灣博碩士論文加值系統

電子科技推陳出新日新月異，商品演進為輕小精緻，容量大速度快。因為體積小限制了設計空間，導致電磁干擾(EMI-Electromagnetic interference)問題益發嚴重，越來越令工程師頭痛。電磁干擾主要分為輻射性(Radiation)電磁干擾與傳導性(Conductivity)電磁干擾兩種。傳導性電磁干擾是經由電源線來傳遞雜訊的，所以在
同一個電力系統迴路，所產生的電磁干擾會透過電源線互相干擾。一般傳導型電磁干擾解決方法是在電源端入口加入一個電感與電容組成的LC 濾波器，阻隔干擾的流出。
以往EMI 工程師為了要量測EMI 干擾，需租用昂貴儀器與認證場地及預訂量測時段。好不容易安排好時間去實驗室進行測試，身上卻只帶了幾種規格化的電感與電容。這些元件值是憑工程師以往的經驗判斷試用，當下若沒有適用的元件可以符合抗干擾要求，則下次再帶不同元件值來測試。本文針對EMI 干擾，提供可調式的傳導型EMI 濾波器。主要是以可連續性變動的共模電感，可現場即時調整電感值，找到所對應的理想濾波頻率。如此可以減少工程師來回於外面測試實驗室及修改電路等所浪費的時間。這樣的設計能幫助所有的工程師，大幅縮短傳導型電磁干擾驗證測試時間，並且更有效的解決電磁干擾問題。

The rapid evolution of electronic science and technology innovation yields small and light goods with large capacity and high speed. The small size limits the design space, leading to increasingly serious EMI (electromagnetic interference) problems. EMI is mainly divided into radiation type and conductivity type. Conducted EMI noise
passes through the power lines. Hence, EMI in the same power system circuit will interfere with each other through the power lines. Generally, the solution of conducted
EMI is to add an LC filter at the supply side entrance. Then, the EMI can be prevented to outflow. In order to solve EMI problem, engineers need to rent expensive equipment, certificated venue and booking measurement time slots. They often take only several normalized inductances and capacitors to go to a lab for testing. If engineers can not figure out the solution of the EMI noise after the testing, they need to prepare other inductances and capacitors next time. This thesis proposes an adjustable conducted EMI filter. The common-mode inductance can be on-line and continuously adjusted. Hence we can find the corresponding ideal filter frequency very soon. With this design, engineers do not to need to spend so much time to go back and forth to the laboratory to do circuit modification. By doing this, EMI issues can be fixed more efficiently.

摘要 ii
ABSTRACT iv
誌謝 iv
目錄 vi
表目錄 viii
圖目錄 ix
符號對照表 xii
第一章 緒論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 研究成果與貢獻 3
1.4 論文架構 3
第二章EMI濾波原理與測量規範 4
2.1 前言 4
2.2 電磁相容性與電磁干擾之說明 5
2.3 雜訊干擾種類與路徑 7
2.4 雜訊電流 8
2.4.1 共模雜訊干擾 9
2.4.2 差模雜訊干擾 10
2.5 EMI 規範介紹 11
2.5.1 各國安規協會單位 11
2.5.2 傳導型電磁干擾量測標準值 13
第三章 可調式傳導型EMI 濾波器設計 17
3.1 前言 17
3.2 EMI濾波器基本架構與元件設計 18
3.2.1 電容(X電容與Y電容) 21
3.2.2 電感(共模電感與差模電感) 23
3.3 可調式傳導型EMI濾波器製作 25
3.3.1共模電感製作 25
第四章 實驗結果 38
4.1 前言 38
4.2 量測儀器與環境介紹 38
4.3 實驗測量結果分析 42
第五章 結論與未來發展方向 55
5.1 結論 55
5.2 未來發展方向 56
參考資料 57

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