臺灣博碩士論文加值系統

本文提出一個具主動箝位之無橋式隔離型SEPIC 轉換器，轉換器採用無橋架構，減少了整流二極體的數量以提升整體系統之效率。而本文所提出之架構，其特色在於定頻控制下，輸入電流包含了CCM 與DCM 成分，由於大範圍的區間為DCM 成分，因此本身具有良好的功因值，並能符合IEC 61000-3-2 CLASS D 的規範，而雖然含有部分的CCM 成分會使得功因值下降，但相對地能使效率提升。除此之外，在CCM 模式下，主動箝位使得各開關元件皆具有零電壓導通之功能，而在DCM 模式下，開關元件皆具有零電流導通之功能，因此對於效率的提升有明顯的幫助。

由模擬與實驗結果，證實本論文所提出之具主動箝位緩振器之無橋式隔離型SEPIC 轉換器可穩定的操作，並於滿載時，符合IEC 的規範，最後並驗證當輸入電流有部分操作於CCM 模式時，有助於效率的提升。

A bridgeless isolated SEPIC converter with active-clamp snubber is presented. This converter uses the bridgeless topology to reduce the rectifier diodes and improve the efficiency. The proposed converter is operated on the fixed frequency, and its input current consists of CCM and DCM parts simultaneously. During some parts of the line frequency, the converter is operated in the DCM so it can achieve the high power factor and confirm to the requirement of IEC 61000-3-2 class D. Although the converter is partly operated in the CCM will decrease the power factor, the efficiency can be improved. In addition, the active-clamp topology can achieve the characteristic of zero voltage turn-on for all switches when the converter is in the CCM operation. The main switches in the DCM operation can also achieve the function of zero current turn-on.

The proposed converter is verified to be functionally worked by the experimental and simulation results based on the 150W prototype circuit and it also conforms to the requirement of IEC 61000-3-2 class D. Finally, the improved efficiency for the proposed converter can be further verified once the input current consists of the part of the CCM operation.

中文摘要
英文摘要
誌謝
目錄
表目錄
圖目錄
第一章 緒論
1.1 研究目的與背景
1.2 論文架構
第二章 各種無橋式架構之介紹
2.1 無橋式BOOST型式功因修正器
2.2 無橋式BUCK、BUCK-BOOST、SEPIC型式功因修正器
2.3 各種無橋式PFC架構總結
第三章 PFC控制原理介紹
3.1 傳統PFC控制原理
3.2 定頻Fixed off time控制
3.3 準主動功因校正
3.4 PFC控制總結
第四章 具主動箝位無橋式隔離型SEPIC轉換器
4.1 前言
4.2 操作模式分析
4.2.1輸入電流為CCM模式之分析
4.2.2輸入電流為DCM模式之分析
4.2.3電路穩態分析
4.3 電路參數設計
4.3.1輸入電感設計
4.3.2變壓器電感設計
4.3.3直流阻隔電容設計
4.3.4諧振電感設計
4.3.5箝位電容設計
4.3.6輸出電容設計
第五章 轉換器元件選取、模擬與實驗結果
5.1 前言
5.2 元件選取
5.2.1輸入電感設計
5.2.2變壓器電感設計
5.2.3直流阻隔電容設計
5.2.4諧振參數設計
5.2.5輸出電容設計
5.2.6零電壓切換之驗證
5.3 模擬與實驗結果
5.3.1輸入電感對功因值的影響
5.3.2變壓器設計
5.3.3電路ZVS模擬與實驗結果
5.3.4電源測模擬與實驗結果
5.4 功因、效率及諧波測量
5.4.1功因及效率圖
5.4.2各階諧波圖
5.5 電路之穩定性
第六章 結論與未來建議
6.1 結論
6.2 未來建議
參考文獻
附錄一
附錄二

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