LLC半橋串聯諧振式轉換器之設計考量與研製｜國立臺灣科技大學博碩士論文系統

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研究生：	謝士弘 Shih-hung Hsieh
論文名稱：	LLC半橋串聯諧振式轉換器之設計考量與研製 Realization Study and Design Considerations of LLC Series-Resonant Half-Bridge Converter
指導教授：	謝冠群 Guan-chyun Hsieh 柳宗禹 Tzong-Yeu Leou
口試委員:	梁從主 Tsorng-Juu Liang 鄒應嶼 Ying-Yu Tzou 陳德玉 Dan Chen
學位類別：	碩士 Master
系所名稱：	電資學院 - 電子工程系 Department of Electronic and Computer Engineering
論文出版年：	2007
畢業學年度：	95
語文別：	中文
論文頁數：	122
中文關鍵詞：	同步整流、LLC半橋串聯諧振
外文關鍵詞：	synchronous rectification, Half-bridge LLC converter
相關次數：	點閱：928 下載：10
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本論文主要為探討LLC半橋串聯諧振式轉換器的設計考量，由於LLC操作在零電壓切換區間有兩種操作模式，其中(1)Region 1：最低切換頻率大於第一諧振頻率（fr1<fs,min）的串聯諧振模式；(2)Region 2：最低切換頻率介於兩諧振頻率之間（fr2<fs,min<fr1）的LLC模式。本論文分析與利用MATLAB模擬轉移函數中的Qr、K與QK參數對轉移函數曲線的影響，也針對兩個操作模式零電壓切換條件作深入的探討。本論文提出諧振電流模式化分析，藉由諧振電流模式化分析將輸出功率與輸入功率作連結，進而推導出諧振元件與功率的關係。對於二次側使用整流二極體在低電壓大電流的輸出應用來說，本論文也利用光耦合器的驅動方式，達成同步整流的功能，使整體效率提昇。最後本論文利用詳細的設計步驟來實際設計、模擬且實做兩台240W操作在不同模式的LLC-SRC轉換器與一台具有同步整流功能的LLC-SRC轉換器，由實驗可以證實這三者的效率皆可達到91%~95%，其中轉換器操作Region 2時的效率會大於Region 1，而同步整流的功能能整體效率維持在94%左右。

This thesis focuses on the design considerations of a half-bridge LLC series resonant converter (LLC-SRC). There are two operation modes in the LLC converter, including (1) Region 1: fs >fr1 for SRC mode, where fr1 is the dominant resonant frequency and fs,min is the minimum switch frequency and (2) Region 2: fr2<fs<fr1 for LLC mode, where fr2 is the second frequency. A transfer function to investigate the system gain by parameters Qr, K, and QK is described. A novel resonant current waveform modeling is proposed to describe the energy conversion in the LLC converter. A design example of 240W LLC-SRC converters are designed and examined for verify the performance in the mentioned two modes, in which both two efficiencies are compared each other. The efficiencies of the two modes are as high as within 91%~95%. In practice, the efficiency in LLC is better than that in SRC, but the efficiency can keep about 94% for all range if synchronous rectification is used.

中文摘要.........................................................................................................Ⅰ
英文摘要.........................................................................................................Ⅱ
目錄.........................................................................................................Ⅲ
圖索引.........................................................................................................Ⅵ
表索引.........................................................................................................ⅩⅡ
第一章  緒論...........................................................................................1
1  研究背景與動機...........................................................................1
2　研究目的.........................................................................................3
3  研究內容.........................................................................................4
4  論文大綱.........................................................................................5
第二章　諧振式電源轉換器簡介...........................................................7
1　串聯諧振式轉換器.........................................................................7
2　並聯諧振式轉換器.......................................................................10
3　串並聯諧振式轉換器...................................................................12
4　LLC串聯諧振式轉換器................................................................14
第三章　LLC半橋串聯諧振式轉換器之狀態分析.....................................19
1　Region 1電路動作分析................................................................19
2　Region 2電路動作分析................................................................32
第四章　設計考量.........................................................................46
1　轉移函數分析.......................................................................46
1.1　 值對轉移函數的影響.......................................................48
1.2　 值對轉移函數的影響.......................................................50
1.3　 值的探討............................................................................51
2　諧振電流模式化分析...................................................................55
3　零電壓條件...................................................................................57
4　諧振元件與功率的關係...............................................................60
5　Region 1諧振元件的設計步驟....................................................61
6　Region 2諧振元件的設計步驟....................................................66
7　同步整流式LLC串聯諧振式轉換器的設計考量.......................71
7.1　同步整流隔離驅動電路設計................................................73
7.2　選擇操作區間........................................................................77
8　功率元件、變壓器與輸出整流濾波電路的設計考量.................80
8.1　功率元件的設計考量............................................................80
8.2　變壓器的設計考量................................................................81
8.3　輸出整流濾波電路的設計考量............................................84
第五章　設計實例.........................................................................................87
1　240WLLC半橋串聯諧振式轉換器規格參數訂定.....................87
2　Region 1諧振元件的選用............................................................87
3　Region 2諧振元件的選用............................................................92
4　功率元件、變壓器與輸出整流濾波電路的選用.........................98
4.1　功率元件的選用...................................................................98
4.2　變壓器的選用........................................................................98
4.3　輸出整流濾波電路的選用..................................................100
第六章　實驗量測......................................................................................101
1　轉換器主要波形量測...................................................................101
2　效率分析.......................................................................................115
第七章　結論與未來研究方向..................................................................118
1　結論...............................................................................................118
2　未來研究方向...............................................................................119
參考文獻.......................................................................................................120

                                

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全文公開日期 2008/07/29 (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 2012/07/29 (國家圖書館：臺灣博碩士論文系統)

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