高功率AC LED交流電壓驅動特性研究｜國立中央大學博碩士論文系統

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研究生：	林明德 MING-TE LIN
論文名稱：	高功率AC LED交流電壓驅動特性研究 Study of Alternating electricity voltage for High Power AC LED
指導教授：	孫慶成 Ching-Cherng Sun
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 光電科學研究所碩士在職專班 Executive Master of Optics and Photonics
畢業學年度：	95
語文別：	中文
論文頁數：	94
中文關鍵詞：	高功率、ITRI 立體導熱LED封裝結構、發光二極體
外文關鍵詞：	Alternating current Light Emitting Diode, AC LED
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本論文研究交流電(Alternating current ;簡稱 AC)驅動之交流發光二極體(Alternating current Light Emitting Diode;簡稱AC LED)並以等效電路研究推論出AC LED電特性模型，並使用『ITRI 立體導熱LED封裝結構(Limited LED package) 』來確認AC LED市電驅動之特性，在室溫不考慮熱偏移之條件，獲得交流電壓下驅動AC LED推論出當微晶粒20-30%失效時雖發光面積下降30%，但由於臨界電壓下降與平均電流與輸入功率的上升，致使光輸出通量維持與初始亮度相仿或以上，也就是說AC驅動之AC LED微晶粒20-30%以內失效時之表現，在效率下降而非輸出光通量下降，此種特性極適合應用於有安全預警要求之應用的照明系統如車燈與隧道或號誌燈只要監控輸入功率或電流變化就可預估微晶粒失效百分比，而此時光源依然維持不變之光通量，提供光源亮度下降前安全替換的時間。

In this thesis, we study so-called AC-LEDs, which can be driven by AC electrical power directly. We build up an equivalent circuit to model the electrical characteristic of the AC-LED. We apply "ITRI''s limited LED package" on AC-LEDs to study the effect by driving the LEDs with the general electrical power system. In room temperature, we obtain that the output brightness holds at the same level or above when the 20%-30% chips fail since the critical voltage drops but the drive current and power increase. Such characteristic enables AC-LED suitable to security-required lighting systems because the variation of the drive current and power can be applied to failure estimation so that the damage LEDs can be replaced before the lighting brightness drops.

摘要                                                         I
Abstract                                                   II
致謝                                                       III
目錄                                                        IV
圖目錄                                                     VII
圖表目錄                                                   XI
一、 緒論                                                    1
1-1 LED背景介紹..............................................1
1-2 研究動機..................................................6
二、 高功率AC LED特性與設計                            7
2-1 DC LED發光原理與等效電路推導簡介..........................7
2-1-1 DC LED 發光原理.......................................7
2-1-2 DC LED 等效電路特性推導..............................10
2-1-3 DC 大面積LED等效電路特性推導........................18
2-2 高壓DC LED與AC LED晶粒結構與等效驅動特性................24
2-2-1 高壓DC LED與等效驅動特性............................24
2-2-2 高壓AC LED交流驅動原理..............................31
2-2-3 高壓AC LED等效I-V特性曲線...........................34
2-3 AC LED交流電相關定義.....................................42
2-3-1 交流波形函數基本定義.................................42
2-3-2 交流電功率相關定義...................................46
2-3-3  AC LED發光效率定....................................48
2-4 單體式高功率立體導熱封裝結構介紹........................49
三、 高功率AC LED實驗之量測                          52
3-1 AC LED 基本特性量測......................................52
3-1-1 AC LED內部等效內阻、臨界電壓.........................52
3-1-2 AC LED 之直流光電特性量測架構........................54
3-1-3 AC LED 之交流光電特性量測架構........................55
3-1-4 AC LED 定電壓壽命實驗模式量測........................57
3-1-5 AC LED 快速檢測設備..................................58
3-2 AC LED 36/54 基本特性量測.................................60
3-2-1 AC LED 36/54 定電流下特性量測.........................60
3-2-2 交流定電壓下AC LED 36/54特性量測與分析...............63
3-2-3 AC LED 36/54 壽命實驗................................66
3-3 交流定電壓下改變瞬時點亮微晶粒數的光電特性分析..........67
四、高功率AC LED交流電壓驅動特性研究                74
4-1 高功率大面積DC LED與AC LED 等效電路特性比較............74
4-2 0.06mm2 × AC LED 36/54pcs等效模型建立與實測比較..........76
4-3 高功率AC LED部份微晶粒失效等效電路推論..................78
4-3-1 高功率AC LED部份微晶粒失效等效電路公式推導..........78
4-3-2 高功率AC LED部份微晶粒失效特性討論..................87
五、結論                                                    90
參考文獻                                                    91
中英對照                                                    93

                                

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