在網路領域中，電能處理已經從原本只是擔負設備內部的電源供應角色，逐漸蛻變為也能參與網路長距離傳輸的一環。透過乙太網路供電技術的加持，在不須利用電源線的情況下，實現經由乙太網路來同時傳送數據資料與直流電力的理念。乙太網路供電系統並非單純的供電技術，它是一種整合性解決方案，需要由電源供電裝置和受電裝置這兩個重要元件來構成。本論文之研究內容為設計一套具有零電壓切換機制的雛型乙太網路供電系統，並實作一台電源供應裝置及一台受電裝置。其中電源供電裝置可提供150 W且具備四組輸出埠，前級部分採用操作於邊界導通模式之主動式功率因數修正器，用以改善輸入功率因數；而後級部分選用擁有柔切特徵之主動箝位返馳式轉換器，利用變壓器漏電感與功率開關之輸出電容達成零電壓切換，藉此提升轉換效率。此外，置於乙太網路纜線另一端的受電裝置，其電路架構則是採用零電壓轉態降壓型轉換器，輸出功率為32 W。論文中將針對上述轉換器的動作原理及各項技術做詳細分析與討論，並說明設計步驟與考量，最後以實驗結果驗證理論分析之正確性。

In networking area, the power supply has gradually become one part of long-distance transmission from local component. By power over ethernet (PoE) technology, data and DC power can be transferred via ethernet without the use of extra power cable. The POE system is not only a power supply technology, but also an integrated solution with two major components, power sourcing equipment (PSE) and powered device (PD). This thesis aims to study a prototype of PoE system with zero-voltage switching (ZVS) features. A 150W PSE unit with 4 output ports is designed and implemented. A transition mode (TM) active power factor corrector (APFC) is used as the pre-regulator to improve input power factor (PF). The post-stage circuit is an active-clamp flyback converter with soft-switching features. The transformer leakage inductance and the parasitic capacitance of the power MOSFET are used to realize the zero-voltage switching. Therefore, high conversion efficiency can be achieved. In addition, a 32W zero-voltage transition (ZVT) buck converter is also implemented as the PD unit. Experimental results for the laboratory prototype are tested and shown to verify the feasibility of the studied PoE system.

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