臺灣博碩士論文加值系統

近年來，隨著全球綠能環保意識高漲及能源危機的議題下，發光二極體已逐漸受到各界的重視。LED具有體積輕巧、壽命長、低汙染、消耗功率低、及耐震耐候性佳等優點，因此近年來被廣泛的應用在各種照明之光源，特別是在汽車頭燈上的應用。但因引擎室周圍為高溫的環境，過高的溫度會使LED的發光效率降低，且使用壽命會大幅下降，如何設計出高效率的散熱系統，是LED頭燈在應用上必須解決的問題。
本研究以汽車引擎所產生吸力帶動氣體方式，來進行對設計散熱模組以氣體對流方式進行散熱。搭配有限元素分析軟體探討高功率LED應用於散熱模組上的熱傳特性；本研究散熱模組為圓柱形鰭片，其在散熱模組設計參數為鰭片直徑、長度、材質、散熱膏4種因子，並以實車運作時之嚴苛條件參數加入分析模擬找出最佳散熱模組參數，最後將模擬實車環境進行實驗。
實驗結果顯示汽車引擎所產生吸力所帶動進氣溫度在70℃(相對引擎室內溫度)與常溫25℃其相對LED晶體平均溫度84.02℃至51.09℃，預估光效率成長近1.18倍及造成預估壽命成長4.7倍。從結果顯示進氣溫度對LED晶體溫度具有相當影響，若如在實車運用上則進氣位置需接近天氣溫度較佳。

In recent years, LED as the global environmental awareness is high and the green to the energy crisis facing the subject, LED has gradually been public attention. in addition to the advantages of its lightweight, long life, low pollution and low power consumption, and of good earthquake-resistant durability. Therefore the application of high power LED as lightning source becomes popular. Its applications in automobile headlamp in particular. The engine room is a high temperature environment. High temperatures will reduce the luminous efficiency and lifetime of LEDs. Thus, designing a high efficiency thermal module is important in LED headlamp application in automobiles.
In this study, the car engine produce suction to drive gas manner, to design carried out in gas convection thermal module. The finite element analysis software of high-power LED applications in the thermal module of heat and mass transfer characteristics. With the finite element analysis software to investigate the heat transfer characteristics of high power LEDs used in the thermal module. Its design parameters of thermal modules for fin diameter, length, texture, thermal grease 4 factor, and joined to harsh conditions of vehicle operation time parameter analysis and simulation to identify optimal thermal module parameters. The last to experiment will simulate the real car environment.
Experimental results show car produced by an engine driven suction inlet air temperature at 70℃(relative to the engine room temperature) and at room temperature 25℃. Relative average temperature of the LED chip measured as 84.02℃ and 51.09 ℃, differences up to 4.7 times of their life. From the results show effects of inlet temperature on LED chip temperature. If as in the use of car air intake location close to better weather temperature.

摘要 I
致謝 V
目錄 VI
圖目錄 VIII
表目錄 X
第１章 緒論 1
1.1 前言 1
1.1.1 LED於車燈之應用 4
1.1.2 LED 汽車頭燈散熱問題 7
1.2 文獻探討 9
1.3 研究動機、方法與流程 12
1.4 論文架構 15
第２章 研究設計與原理 16
2.1 LED汽車頭燈散熱設計 16
2.2 熱傳遞原理 18
2.3 熱阻定義 19
第３章 數值分析模擬 23
3.1 ANSYS 基本架構與分析流程 23
3.1.1 前處理介紹 24
3.1.2 分析器介紹 25
3.1.3 後處理介紹 26
3.2 高功率LED熱傳分析 27
3.2.1 實體模型設計 27
3.2.2 元素形式設定 28
3.2.3 材料之熱傳係數設定 29
3.2.4 熱源負載設定與邊界條件 29
3.2.5 分析求解 31
3.3 LED散熱模組熱傳分析 31
第４章 實驗規劃與方法 33
4.1 實驗規劃 33
4.2 實驗設備 34
4.3 高功率LED發熱溫度分析模擬與實驗驗證 39
4.4 高功率LED發熱瓦數確認 42
4.5 引擎溫度場與進氣量測 44
4.6 腔體設計與鰭片設計 48
4.7 LED散熱模組分析模擬 54
4.8 LED散熱模組最佳化分析模擬 56
4.9 LED散熱模組實驗量測 59
第５章 結果與討論 62
5.1 高功率LED分析模擬與實驗驗證結果 62
5.2 散熱模組最佳化分析模擬結果 66
5.3 最佳化散熱模組應用模擬實車環境實驗結果 71
第６章 結論 73
參考文獻 75

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