由變壓器結構設計改善低功率返馳式轉換器之共模雜訊

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研究生：	黃文鴻 Wen-Hung Huang
論文名稱：	由變壓器結構設計改善低功率返馳式轉換器之共模雜訊 Common Mode Noise Reduction for Low Power Flyback Converter by Transformer Construction Design
指導教授：	楊成發 Chang-Fa Yang
口試委員:	楊宗銘 Tsung-Ming Yang 邱煌仁 Huang-Jen Chiu 羅有綱 Yu-Kang Lo
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	中文
論文頁數：	80
中文關鍵詞：	共模雜訊、返馳式轉換器、傳導性EMI
外文關鍵詞：	Common mode noise, flyback converter, conducted EMI
相關次數：	點閱：219 下載：6
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本論文旨在研究變壓器結構設計對於低功率返馳式轉換器的共模雜訊之影響，希望能達到符合傳導性電磁干擾的規範下簡化濾波器設計之目標。在提出降低雜訊耦合之變壓器結構設計之前，首先要對於共模雜訊的來源以及傳導路徑加以分析；良好的變壓器結構設計配合正確的電路板佈局方能得到最佳效果。最後設計一個僅有差模濾波器的18W返馳式轉換器，經由搭配不同結構的變壓器設計，量測其傳導性電磁干擾的結果，以驗證該結構設計對於改善共模雜訊的成效。

The purpose of this thesis is to investigate the effects of the transformer construction design to the common mode noises of the low power flyback converter. Thus, the target which passes the specifications of the conducted electromagnetic interference (EMI) can be achieved with a simplified filter design. To obtain the transformer construction design for reducing the common mode noises, the noise sources and the conduction loops are analyzed first. A good transformer construction design with correct PCB layout leads to the best result. Finally, each transformer with a different construction design is applied to an 18W flyback converter with only a differential mode filter, and the improvement of the common mode noises is evaluated by measuring the results of the conducted EMI.

目  錄
中文摘要.........................................................................................................Ⅰ
英文摘要.........................................................................................................Ⅱ
誌謝.................................................................................................................Ⅲ
目錄.................................................................................................................Ⅳ
圖表索引.........................................................................................................Ⅶ
第一章 緒論.....................................................................................................1
1.1	研究背景與動機.................................................................................1
1.2	研究目的與方法.................................................................................2
1.3	內容大綱.............................................................................................3
第二章　傳導性電磁干擾之量測...................................................................5
2.1	傳導性EMI量測之方法與規範........................................................5
2.2	LISN之等效電路................................................................................8
2.3	頻譜分析儀之訊號檢測.....................................................................9
第三章　隔離型返馳式架構之電源設計.....................................................13
	3.1	隔離型返馳式架構之簡介...............................................................13
	3.2	控制IC的選用...................................................................................22
3.3	返馳式架構電源變壓器之設計.......................................................25
第四章　共模雜訊之雜訊路徑分析.............................................................28
4.1	共模與差模之雜訊路徑...................................................................28
4.2	共模雜訊源之分析...........................................................................29
4.3	變壓器之高頻電容模型...................................................................32
4.4	共模雜訊路徑之分析.......................................................................34
第五章　傳統EMI之解決方法....................................................................40
5.1	共模電感...........................................................................................40
5.2	Y電容...............................................................................................42
5.3	法拉第屏蔽.......................................................................................45
5.4	外銅箔之屏蔽...................................................................................47
5.5	實驗之結果…………………...........................................................48
第六章　降低共模雜訊之變壓器設計.........................................................52
6.1	線圈屏蔽...........................................................................................52
6.2	磁芯雜訊消去法...............................................................................58
6.3	磁芯雜訊屏蔽法...............................................................................62
6.4	混合模式...........................................................................................67
6.5	三明治的繞製方式...........................................................................69
6.6	討論...................................................................................................75
第七章　結論與未來研究方向.....................................................................77
7.1	結論...................................................................................................77
7.2	未來研究方向...................................................................................78
參考文獻.........................................................................................................79

                                

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全文公開日期 2012/07/28 (校內網路)
全文公開日期本全文未授權公開 (校外網路)
全文公開日期本全文未授權公開 (國家圖書館：臺灣博碩士論文系統)

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