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研究生:房玉堂
研究生(外文):Yu-Tang Fang
論文名稱:具高功率因數與低總諧波失真之AC LED驅動器之效率改善
論文名稱(外文):Efficiency Improvement of AC LED Driver with High PF and Low THD
指導教授:胡國英
指導教授(外文):Kuo-Ing Hwu
口試委員:謝振中俞齊山李永勳
口試委員(外文):Jenn-Jong ShiehChi-shan YuYuang-Shung Lee
口試日期:2012-07-25
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電機工程系研究所
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:2012
畢業學年度:100
語文別:中文
論文頁數:109
中文關鍵詞:AC LED驅動器功率因數總諧波失真效率切換式LED模組場效可規劃邏輯閘陣列
外文關鍵詞:AC LED DriverPower FactorTotal Harmonic DistortionEfficiencySwitched LED ModuleField Programmable Gate Array
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本論文採用一具高功率因數與低總諧波失真之AC LED驅動器,於輸入橋式整流後端加入一切換式LED模組,並以場效可規劃邏輯閘陣列(Field Programmable Gate Array, FPGA)做為控制核心,主要乃針對此驅動器之效率來進行改善。其切換式LED模組係由數串LED串列所構成,而各LED串列各自具有一由金氧半場效電晶體(Metal Oxide Semiconductor Field Effect Transistor, MOSFET)所構成之開關。當切換式LED模組上之開關導通時,該串LED串列相當於被短路而不導通發亮;當開關截止時,多餘的輸入電壓將跨至該LED串列上使其導通發亮,以減少多餘的輸入電壓跨在BJT電流源的集極與射極間所造成之不必要的功率損耗,以提高驅動器的整體效率。

In this thesis, one AC LED driver with high PF and low THD is adopted, which is added with the proposed switched LED module and is controlled based on the field programmable gate array (FPGA). By doing so, the efficiency of such an AC LED driver can be improved greatly. This switched LED module is constructed by several LED strings, which have individual series-connected MOSFET switches. As the switch of the switched LED module is turned on, the corresponding LED string is short-circuited and hence is not conducted, whereas as the switch of the switched LED module is turned off, the corresponding LED string is conducted due to the redundant input voltage across this LED string. By doing so, the redundant input voltage across between the collector and the emitter of the BJT current source can be reduced, that is, the unwanted power dissipation in the BJT current source can be decreased, so as to upgrade the efficiency of the overall system.

目 錄

中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
表目錄 viii
圖目錄 ix
第一章 緒論 1
1.1研究動機及目的 1
1.2研究方法 8
1.3論文內容架構 9
第二章 白光LED特性與其驅動電路之介紹 10
2.1 LED之發光原理 10
2.2白光LED介紹 11
2.3 LED陣列結構 12
2.4 LED陣列結構 14
2.4.1直流驅動LED 14
2.4.2交流驅動LED 17
2.5 LED調光方式簡介 18
第三章 具高功率因數與低總諧波失真之AC LED驅動電路分析與其效率改善方法介紹 20
3.1前言 20
3.2具高功率因數與低總諧波失真之AC LED驅動電路之工作原理與分析
20
3.3輸入電流總諧波失真之分析與數學推導 25
3.4具高功率因數與低總諧波失真之AC LED驅動電路之效率改善方法的介紹與分析 28
3.4.1直流驅動LED 28
3.4.2具效率改善及高功率因數與低總諧波失真之AC LED驅動電路之
分析 32
第四章 硬體電路設計 37
4.1系統架構 37
4.2系統規格 38
4.3系統元件參數設定與元件選配 39
4.3.1 BJT電流源設計 39
4.3.2 LED模組設計 41
4.3.3無ADC電流取樣電路設計 42
4.3.3.1電流回授電路設計 42
4.3.3.2鋸齒波產生器之設計 44
4.3.4 切換式LED模組設計 46
4.3.4.1切換式LED模組之串列與顆數設計 46
4.3.4.2切換式LED模組之閘極驅動電路 49
4.3.5調光命令之低通濾波器設計 49
4.3.6零點偵測電路設計 50
4.3.7準位上抬電路設計 51
4.3.8多工器介紹 51
4.3.9 FPGA電路板介紹 54
第五章 數位系統設計 55
5.1 VHDL程式簡介 55
5.1.1 Library宣告區 56
5.1.2 Use宣告區 56
5.1.3 Entity宣告區 56
5.1.4 Architecture宣告區 57
5.1.5物件與型別模式 57
5.2程式動作流程 58
5.3零點偵測與正弦波建表 60
5.4無ADC電流取樣 62
5.5數位PI控制器與調光 64
5.6 DPWM產生器 67
第六章 模擬與實驗結果 68
6.1前言 67
6.2電路模擬結果 67
6.2.1未加入切換式LED模組之模擬結果 68
6.2.2加入切換式LED模組後之模擬結果 72
6.2.3加入切換式LED模組前與加入切換式LED模組後之模擬電流諧
波失真比較 76
6.2.4電路模擬小結 77
6.3實驗結果 78
6.3.1未加入切換式LED模組之輸入電壓與輸入電流之波形 78
6.3.2加入切換式LED模組後之輸入電壓與輸入電流之波形 80
6.3.3未加入切換式LED模組之無ADC電流取樣波形 82
6.3.4加入切換式LED模組後之無ADC電流取樣波形 84
6.4實驗相關參數量測 86
6.4.1各次諧波分布圖 86
6.4.2總諧波失真 88
6.4.3功率因數 88
6.4.4波峰因數 89
6.4.5整體效率 89
6.4.6 BJT電流源之溫度 90
6.5實驗總結 91
第七章 結論與未來展望 92
7.1結論 92
7.2未來展望 92
參考文獻 93
符號彙編 100
附錄A 108



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