電子產品在設計的過程中，必須能通過傳導干擾的測試標準，本論文的目的是研究乙太網路線供電設備(Power-over-Ethernet, PoE)能夠符合電磁相容(Electromagnetic compatibility, EMC)的要求。文中會逐一介紹電磁干擾(Electromagnetic interference, EMI)標準的量測方式，也將討論和分析待測物(Equipment under test, EUT)電路模型(Circuit modeling)及設計考慮。論文中會使用軟體MATLAB對乙太網路線供電設備做量測模擬計算，理論的分析會與實驗的數據做比對。藉由數學模型的方法，能夠盡量減少選擇濾波元件所花費的時間。
關鍵字：電磁相容，乙太網路線供電設備，電路模型

Tests for complying with conducted emission limits are usually carried out during the electrical products design process. This thesis aims to study electromagnetic compatibility (EMC) of Power-over-Ethernet (PoE) equipment. Electromagnetic interference (EMI) standards and measurement setup are introduced. Circuit modeling and design considerations of the equipment under test (EUT) are analyzed and discussed in details. MATLAB simulations are shown and verified by the EMI measurement of a PoE equipment. The theoretical analysis and simulation are fully agreed by the experimental verifications. The trial-and-error guess work in selecting the EMI filter components can be minimized by the studied mathematic modeling method.
Keywords: Electromagnetic Compatibility, Power-over-Ethernet, Circuit
Modeling

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