臺灣博碩士論文加值系統

典型的EMI(Electromagnetic Interference)濾波器設計方法在分析的過程中，往往忽略了雜訊阻抗的影響，造成在設計EMI濾波器的同時，濾波能力並無法符合所需要的衰減量。本文提出考慮雜訊阻抗的影響的方法，使用可能的最大與最小的共模與差模的雜訊阻抗來設計EMI濾波器，依照濾波器的組態，決定會造成最差的衰減情形的雜訊阻抗。先行量測加入測試用濾波器的前、後(例如：CM電感)雜訊，獲得實際量測的衰減情形，利用簡單的操作介面(圖形使用用者介面，GUI)軟體(Matlab)計算雜訊阻抗及估算所需的濾波元件值；經由實際量測的結果來驗證此方法，確保能達到所需的衰減量，並提供設計者一個簡易且實用的工具。

In the typical method of designing EMI(Electromagnetic Interference) filter, the noise impedance usually is ignored for simplicity. It may cause that the filter can not provide the required attenuation. A method considering the effect of the noise impedance is proposed, and the maximum possible magnitude and minimum possible magnitude of the common mode and differential mode noise impedances are used to design EMI filter. According to the configuration of filter, the worst attenuation due to the noise impedance can be determined. Beginning with measuring the noise spectrum with and without the test filter (e.g., CM inductor) to obtain practical attenuation, and then the software (Matlab) with a simple interface (Graphical User Interface, GUI) is used to compute the noise impedances and evaluate the values of the filter components. The experimental results show that proposed method can ensure that the required attenuation can be achieved and provide a simple and practical tool for engineering designers.

中文摘要 ------------------------------------------------------------------------------------- i
英文摘要 ------------------------------------------------------------------------------------- ii
誌謝 ------------------------------------------------------------------------------------- iii
目錄 ------------------------------------------------------------------------------------- iv
表目錄 ------------------------------------------------------------------------------------- vi
圖目錄 ------------------------------------------------------------------------------------- vii
符號說明 ------------------------------------------------------------------------------------- x



第一章、 緒論------------------------------------------------------------------------------- 1
1.1 研究動機------------------------------------------------------------------------- 1
1.2 研究方法與系統描述--------------------------------------------------------- 3
1.3 論文大綱------------------------------------------------------------------------- 5

第二章、 傳導性EMI量測--------------------------------------------------------------- 6
2.1 共模及差模電流--------------------------------------------------------------- 6
2.2 傳導性EMI規範--------------------------------------------------------------- 8
2.3 電力線阻抗穩定網路--------------------------------------------------------- 11
2.4 傳導性量測輔助電路的簡介----------------------------------------------- 13
2.4.1 差模拒斥網路----------------------------------------------------------- 13
2.4.2 功率結合器-------------------------------------------------------------- 15

第三章、 雜訊阻抗的探討--------------------------------------------------------------- 18
3.1 典型的EMI濾波電路--------------------------------------------------------- 18
3.2 EMI濾波器之CM、DM等效電路與衰減量之設計----------------- 22
3.2.1 EMI濾波器之CM等效電路與衰減量之設計------------------ 23
3.2.2 EMI濾波器之DM等效電路與衰減量之設計------------------ 26
3.3 雜訊阻抗對濾波器設計方法----------------------------------------------- 30
3.3.1 典型濾波器的設計方式---------------------------------------------- 30
3.3.2 雜訊阻抗對EMI濾波器影響與設計------------------------------ 31
3.3.2.1 CM雜訊阻抗的影響---------------------------------------------- 31
3.3.2.2 DM雜訊阻抗的影響---------------------------------------------- 35
3.3.2.3 CM與DM之最大及最小雜訊阻抗之決定------------------ 38
3.3.2.4 EMI濾波器的設計------------------------------------------------- 44

第四章、 硬體製作與軟體規劃--------------------------------------------------------- 51
4.1 硬體製作------------------------------------------------------------------------- 51
4.1.1 共模及差模檢知電路------------------------------------------------- 52
4.1.1.1 共模檢知電路------------------------------------------------------ 52
4.1.1.2 差模檢知電路------------------------------------------------------ 54
4.2 圖形使用者介面介紹--------------------------------------------------------- 55
4.3 軟體的規劃--------------------------------------------------------------------- 56
4.3.1 CM雜訊阻抗及CM濾波器------------------------------------------ 58
4.3.2 DM雜訊阻抗及DM濾波器------------------------------------------ 62

第五章、 實驗結果與頻譜量測--------------------------------------------------------- 68
5.1 設備及儀器配置--------------------------------------------------------------- 68
5.2 CM濾波器設計---------------------------------------------------------------- 70
5.3 DM濾波器設計---------------------------------------------------------------- 73
5.4 EMI濾波器設計--------------------------------------------------------------- 75

第六章、 結論------------------------------------------------------------------------------- 77
6.1 結論------------------------------------------------------------------------------- 77
6.2 未來研究方向與展望--------------------------------------------------------- 79
參考文獻 ------------------------------------------------------------------------------------- 80

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