臺灣博碩士論文加值系統

通信系統常使用直流48V電源，但對其控制電腦則以直流12V電源較為普遍，所以需要直流轉換器以將48V轉換成12V電源。因此，本論文研製一由三組48V/12V/20A降壓式直流轉換器組成之低壓直流電力系統，並使用垂下均流控制以使三組降壓式直流轉換器輸出電流均流。更進一步設計配電背板，以使三組降壓式直流轉換器經由ORing二極體並聯再供應嚴荷負載，並可防止逆流。但因ORing二極體的壓降大，造成甚大功率耗損，所以設計ORing MOSFET取代ORing二極體以提升效率。論文中將會用電壓迴路極點安置法設計降壓式直流轉換器之電壓控制器，並運用運算放大器整合電壓控制器及垂下均流控制器。最後，由電路模擬及實驗結果，驗證所提低壓直流電力系統之有效性。

Telecommunication system often adapts DC 48V input power supply; however, the main computer control system normally requires DC 12V power supply. As a result, it requires a DC power converter to convert 48V into 12V power system. This thesis designs a low voltage DC power system which consists of three 48V/12V/20A DC/DC buck converters with droop current sharing control to achieve equal sharing current control. Furthermore, the output currents of the DC/DC converters pass through ORing diodes at power distribution backplane to provide power to critical load. Since the voltage drop of the ORing diode results in great deal of power loss, so using ORing MOSFET to replace ORing diode can improve efficiency significantly. The pole placement method will use to design the voltage controller which integrates droop current sharing controller in single operational amplifier. Finally, some circuit simulations and experimental results are provided to verify the effectiveness of the proposed low voltage DC power system.

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 vi
圖目錄 vii
符號說明 ix
第一章　緒論 1
1.1 研究背景與動機 1
1.2 目前研究成果 3
1.3 研究方法 9
1.4 論文架構 9
第二章　具垂下均流控制之降壓式直流轉換器 11
2.1 簡介 11
2.2 降壓式直流轉換器之基本原理 11
2.2.1 降壓式直流轉換器連續電流導通模式之穩態分析 13
2.2.2 降壓式直流轉換器CCM/DCM之邊界條件 18
2.2.3 降壓式直流轉換器不連續電流導通模式之穩態分析 18
2.2.4 脈波寬度調變控制 20
2.3 輸出電感與電容之設計 23
2.4 並聯直流轉換器系統 26
2.4.1 穩態垂下電壓特性設計 28
2.4.2 垂下電壓控制穩態特性分析設計 28
第三章　具垂下均流控制之降壓式直流轉換器控制系統分析及設計 31
3.1 簡介 31
3.2 降壓式直流轉換器的小信號模式 31
3.3 電壓控制器設計 35
3.4 迴授分壓網路與補償網路之設計 36
3.5 垂下均流控制器設計 38
第四章　模擬與實驗結果 42
4.1 簡介 42
4.2 具垂下均流控制之降壓式直流轉換器的元件選擇與參數設計 42
4.3 模擬與實作 46
4.3.1 電路模擬 46
4.3.2 電路實作 57
4.4 配電背板之效率改善 67
第五章　結論與未來研究方向 75
5.1 結論 75
5.2 未來研究方向 75
參考文獻 77
附錄 82
簡歷 84

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