臺灣博碩士論文加值系統

本論文針對返馳式轉換器做分析研討，深入針對不連續的傳導模式
(DCM)及連續倒通模式(CCM)於返馳式轉換器裡運作方式進行探討。文中分
別針對不連續的傳導模式和連續倒通模式的電路分析和性能評價。又針對
選擇零件和變壓器設計的選用及設計詳細描述。
最後，提出一輸出100 W 返馳式轉換器運作於不連續導通模式和連續導
通模式的設計實例，實驗結果是符合設計。

本論文針對返馳式轉換器做分析研討，深入針對不連續的傳導模式
(DCM)及連續倒通模式(CCM)於返馳式轉換器裡運作方式進行探討。文中分
別針對不連續的傳導模式和連續倒通模式的電路分析和性能評價。又針對
選擇零件和變壓器設計的選用及設計詳細描述。
最後，提出一輸出100 W 返馳式轉換器運作於不連續導通模式和連續導
通模式的設計實例，實驗結果是符合設計。

中文摘要.............................................................I
英文摘要........................................................... II
誌謝...............................................................III
目錄............................................................... IV
表目錄............................................................ VII
圖目錄........................................................... VIII
第一章緒論......................................................... 1
1.1 研究背景與動機................................................. 1
1.2 研究內容...................................................... 2
1.3 研究成果.......................................................3
第二章返馳式轉換器概說.............................................. 4
2.1 返馳式轉換述................................................... 4
2.1.1 轉換式電源穩定器廣泛應用之原因................................. 5
2.2. 升降壓型轉換器(Buck Boost Converter)介紹...................... 6
2.2. 升降壓型轉換器(Buck Boost Converter) ......................... 6
2.2.2. 升降壓型轉換器操作模式....................................... 7
2.2.3 升降壓型轉換器連續導通模式穩態分析........................... 7
2.2.4 升降壓型轉換器操作邊界模式的分析.............................. 9
2.2.5 輸出電流小於電感的臨界電流( I LB ).......................... 11
2.3 返馳式轉換器電源穩定器........................................13
2.3.1 返馳式變換器工作模式......................... 17
第三章返馳式轉換器電路分析...................... 20
3.1 變壓器之原理............................ 20
3.1.1 安培定律(Ampere’s Law)......................... 20
3.1.2 法拉第感應定律(Faraday’s Law of Inductor)............ 21
3.1.3 愣次定律(Lenz’s Law)......................... 23
3.1.4 磁路的結構............ 23
3.1.5 電路的結構.............. 24
3.1.6 變壓器之等效電路...................25
3.1.7 各種陶瓷鐵心的特性比較及其形狀介紹.................. 26
3.1.7.1 磁性材料之特性比較.... 26
3.1.7.2 變壓器設計對鐵心之要求................... 26
3.1.7.3 電感器設計對鐵心之要求........................................ 27
3.1.7.4 各種不同外型鐵心之較.............................. 27
3.2 返馳式轉換器基本電路............ 28
3.3 返馳式轉換器電路各種狀態分析..............28
3.3.1 邊界模式BCM............ 28
3.3.2 返馳式轉換器操作在連續導通模式(CCM)的分析.................... 31
3.3.3返馳式轉換器操作在不連續導通模式(DCM)的分析.............. 34
第四章設計考量..............................................38
4.1 控制器分析............................................................ 38
4.2 變壓器設計考量........................................ 41
4.2.1 變壓器在各種DC/DC 電源轉換器上的特性比較................. 41
4.2.2 集膚深度對變壓器的影響... 42
4.2.3 變壓器磁滯曲線工作區.... 44
4.2.4 設計變壓器注意事項........ 45
4.2.5 變壓器在返馳式轉換器上的設計步驟與設計實例................... 48
4.3 設計步驟.............................. 49
4.4 零件選用............... 53
第五章設計實例.......................... 58
5.1 返馳式DC/DC 轉換器設計實例………...................... 58
5.2 電路操作.................................. 58
5.3 緩衝電路提高效率.................. 59
5.4變壓器設計流程......................... 59
第六章實驗及討論............................... 63
6.1 實作波型量測.......................... 64
6.2 效率............................... 70
第七章結論................................. 71
7.1 結論...................................... 71
7.2 未來研究方向及建議............................................72
參考文獻........................................................ 73

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