臺灣博碩士論文加值系統

發光二極體(LED)由於具有高亮度、低消耗功率與使用壽命長等的優點，已逐漸成為未來照明設備的發展重點，故近年來LED 皆朝向高功率的方向發展；但如此也導致其在運作時所產生高廢熱而造成LED 之光衰與短壽命等的不利影響。有別於業界常見的散熱方法如採用鰭型散熱片、孔洞對流散熱、熱導管散熱、及裝設均溫板等等，利用熱電材料及元件所製成的熱電能源產生器搭配散熱裝置不僅可以有效地解決高功率LED 路燈的散熱問題，更可以將LED 路燈所產生的廢熱轉換成電能，是一種相當創新的高功率LED 路燈之散熱技術。有鑑於此，
本研究設計不同的快速散熱裝置，並搭配熱電能源產生器實際應用在高功率LED路燈進行快速散熱與廢熱轉電的功效研究。實驗證據顯示，以熱電能源產生器作為廢熱轉電的核心技術，並結合導熱、散熱材料與快速散熱裝置的運用，不僅可以使得60W LED 路燈在工作時能達到最低的接合面溫度(48℃)，同時藉由熱電能源產生器的運作，更能有效率地將60W LED 路燈所產生的大量廢熱轉換成可再利用的電能(70.2mW)。

Owing to the Light Emitting Diode (LED) with the advantages of high brightness,less power consumption, long lifetime etc, it gradually becomes the development focus of lighting device in the future. In recent years, LEDs were aimed at the development of high power efficiency. However, such a situation always leads to an unavoidable waste-heat problem and causes an adverse effect on LED including the brightness decay and shortened lifetime. In dealing with heat-dissipation for highpower LED, most of methods rely on the heat dissipation plate, drilling holes, heat pipe, and adding isothermal vapor chamber, etc. The thermoelectric generators made of thermoelectric materials not only could solve the heat-dissipation problem of high power LED streetlights, but also effectively transform the waste heat to renewable electricity. Basing on the statement mentioned in the above, different structures using rapid heat-dissipation device collocating with thermoelectric generators were fabricated and applied on the high power LED streetlights to study the efficiency of rapid heat-dissipation and the electricity from transformed the waste-heat. Evidence indicated that the thermoelectric generator indeed acts the kernel technology for waste-heat transformed to renewable electricity. By integrating the thermoelectric generator with heat-conduction, heat-dissipation material, and heat-dissipation device,
it not only could lead the 60W LED streetlight to reach the lowest LED junction temperature (48℃), but also obtain a renewable electricity (70.2mW) by transforming the waste-heat from high power LED streetlights.

CONTENTS
Abstract (in Chinese)........................................................................................ III
Abstract (in English)......................................................................................... V
Acknowledgement............................................................................................. VII
Figure Caption................................................................................................... VIII
Table Caption..................................................................................................... IX
Contents............................................................................................................. X
Chapter 1 Introduction..................................................................................... 1
1.1 Background.................................................................................... 1
1.2 Motivation...................................................................................... 3
1.3 Organization of this thesis............................................................. 4
Chapter 2 Basic Theories of Thermoelectric Devices.................................... 5
2.1 Thermoelectric effect……………………………………………. 5
2.2 Seebeck effect…………………………………………………… 6
2.3 Peltier effect…………………………………………................... 7
2.4 Thomson effect………………………………………………….. 8
Chapter 3 Experimental Procedure................................................................. 10
3.1 Experimental materials.................................................................. 10
3.2 Heat-dissipation device fabrication for high power LED
streetlights using thermoelectric generators…………………… 11
3.2.1 Thermoelectric generators directly assist high power LED
streetlights to proceed the heat-dissipation process…….... 11
3.2.2 Thermoelectric generators accompanying with heat
dissipation arrangements to assist high power LED
streetlights to proceed the heat-dissipation process….. 12
3.2.3 Outdoor test for 24 hours of the heat-dissipation device
of high power LED streetlights……………………….. 13
3.3 Measurement.................................................................................. 14
Chapter 4 Results and Discussion.................................................................... 15
Chapter 5 Conclusions...................................................................................... 19
Reference 21
Figure 26
Table 41
Biography 42

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