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研究生:謝志賢
研究生(外文):Chih-Hsien Hsieh
論文名稱:新型低電壓大電流直流至直流轉換器之研製
論文名稱(外文):Study and Implementation of a Novel DC-DC Converter for Low Output Voltage and High Output Current
指導教授:林瑞禮梁從主
指導教授(外文):Ray-Lee LinTsorng-Juu Liang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電機工程學系碩博士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:80
中文關鍵詞:小訊號模型低電壓自動平衡
外文關鍵詞:low output voltagesmall-signal modelingautomatic balance
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本論文提出一「新型低電壓大電流直流至直流轉換器」,其降壓比為傳統降壓型(Buck)轉換器的二分之一。此直流轉換器之輸出形式採用兩相式電感電流交錯輸出,可減少電感電流應力和降低輸出電流漣波;同時,電路本身具有兩相電流自動平衡之機制,而不需額外的均流控制電路。因此,此直流轉換器適合於低電壓大電流轉換之應用。於文中,將針對所提出之轉換器電路,探討其動作原理及電路特性,並推導此轉換器之電壓模式開迴路小訊號模型(Small-signal modeling),以分析其系統穩定度並設計迴授補償網路。最後,實作一輸入電壓12 V和輸出規格1.5 V/ 40 A之雛型電路,以驗證本論文所提轉換器架構之可行性與正確性。
“A novel DC-DC converter for low output voltage and high output current” is proposed in this thesis. The voltage ratio of this converter is half of a conventional buck converter with the same duty cycle. Since the output current is the sum of two-phase inductor currents with 180 phase-shifts, therefore, the inductors’ current stress and the output current ripple can be effectively reduced. Moreover the currents through two-phase inductor can be balanced automatically, so an extra current-sharing control circuit is no longer required. Consequently, this novel DC-DC converter is suitable for low voltage and high current applications. This thesis first analyzes the proposed converter operating principles and circuit characteristics, and then derivates the voltage mode open-loop small-signal model to discuss the system stability and design the feedback compensator network. Eventually, a prototype circuit with input 12 V and output 1.5 V/ 40 A is implemented to verify the accuracy and feasibility of the proposed converter.
摘要..........................................I
Abstract......................................II
誌謝..........................................III
目錄..........................................IV
表目錄........................................VII
圖目錄........................................VIII
第一章 緒論..................................1
1.1 研究背景與目的 ............................1
1.2 論文架構簡介..............................3
第二章 低電壓大電流直流至直流轉換器之架構.....4
2.1 單級式轉換器..............................4
2.1.1 降壓型轉換器 ............................4
2.1.2 主動箝位倍流整流順向式轉換器............5
2.1.3 倍流整流推挽式轉換器....................6
2.1.4 半橋式轉換器 ............................7
2.1.5 倍流整流相移式全橋轉換器................10
2.2 雙級式轉換器..............................11
2.3 高降壓比轉換器 ............................14
2.3.1 單開關串接高降壓比轉換器................14
2.3.2 抽頭線圈電感降壓型轉換器................17
2.3.3 雙降壓比兩相式降壓型轉換器..............19
第三章 新型低電壓大電流直流至直流轉換器.......21
3.1 動作原理分析..............................22
3.2 穩態特性分析..............................28
3.3 同步整流技術..............................30
3.4 小訊號模型推導 ............................32
3.4.1 狀態空間平均法..........................34
3.4.2 責任週期對輸出電壓之轉移函數............47
3.4.3 輸入電壓對輸出電壓之轉移函數............48
第四章 硬體電路設計考量與實驗結果.............49
4.1 電路元件參數設計..........................50
4.1.1 電感值參數設計..........................50
4.1.2 開關與同步整流開關之選用................51
4.1.3 輸出濾波電容參數設計....................53
4.2 硬體電路控制IC之介紹......................54
4.3 迴授補償網路..............................56
4.3.1 小訊號模型之驗證........................56
4.3.2 補償網路之設計..........................59
4.4 實驗結果..................................62
第五章 結論與未來展望.........................75
5.1 結論......................................75
5.2 未來展望..................................76
參考文獻......................................77
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