具廢熱轉電散熱模組及微小電力儲能之高亮度LED照明裝置結構設計與研製

A Study of Innovative Structural Design for High Brightness LED Lighting Device with Thermoelectric Heat-dissipation Module and Microelectric Energy Storing

葉帝均(Ti-Chun Yeh)

指導教授 ： 王欽戊

國立中正大學/工學院/光機電整合工程研究所/碩士(2014年)

摘要

LED是一種固態半導體照明裝置，相較於傳統螢光燈，其具有許多的優點，且隨著近年來的改善，LED具有相當大的潛力成為下一代的公共照明光源。不幸的是，由LED所產生的廢熱問題仍然是影響高亮度LED的穩定性、可靠性及壽命的發展瓶頸。傳統解決LED之散熱問題的方法，包含：散熱鰭片、熱管、迴路熱管、均溫板和致冷晶片等等，在公眾應用上，這些方法都是將熱能直接排放到環境中，容易造成更嚴重的溫室效應。然而熱電能源產生器，已被證實為一種半導體裝置，其可直接轉換電能為熱能，或是可直接回收廢熱轉換成電能，具有很大的潛力成為解決廢熱問題的重要角色。有鑑於此，本研究以熱電能源產生器作為熱電轉換的核心，其乃利用熱電能源產生器的冷熱端溫差來產生可用的電力輸出。首先會先設計出LED廢熱轉電模組之最佳結構，其利用高亮度LED所產生的廢熱有效地導入本LED廢熱轉電模組之吸熱塗層，以防止熱能的散失，再利用各種吸熱塗層材料有效地吸收住高亮度LED所產生的廢熱，然後再將該熱源透過導熱材料導至熱電晶片之熱端，至於熱電晶片的冷端則放置各種有效的散熱材料，完成LED廢熱轉電模組。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，並結合吸熱、導熱與散熱材料的運用，不僅可以使高亮度10W LED燈泡在工作時達到最低的LED接面溫度(71℃)，更能將高亮度LED所產生的廢熱轉換成可再利用的再生電能(104.44mW)。

關鍵字

熱電晶片 ； 微小電力儲能 ； LED散熱

並列摘要

Light emitting diode (LED) is a solid state semiconductor luminescence device and demonstrates a number of benefits compared to traditional incandescent lamps. With further improvement LEDs have a great potential to become the next generation of general illumination source. Unfortunately, the thermal problem caused by the LED itself is still a bottleneck to limit the stability, reliability and lifetime of LED. In traditional, the technologies of solving the heat-dissipation problem for LED, including: heat sink, heat pipe, loop heat pipe, adding isothermal vapor chamber, and adhering cooling chip, etc. In the public application, all of these methods are exhausting the waste heat into the environment and cause the more serious greenhouse effect. However, the thermoelectric generator can directly convert the electricity to thermal energy for cooling or transform the waste heat into electric power. Hence, the thermoelectric generator is increasingly seen as having the potential to make important contributions to solve the thermal problem. Based on the statement mentioned in the above, the thermoelectric generator is the core of thermoelectric transformation in this study, which utilizes the temperature difference between the hot end and cold end to generate the available power energy. First, the LED heat energy absorbed by the heat-absorption layer and then conducted by the heat-conduction materials will reach the hot side of thermoelectric chip. In the cold side of thermoelectric chip, the different heat-dissipation materials will be effectively designed to act the heat-dissipation role and ensure the temperature difference between the hot side and cold side is large enough. Finally, the LED thermoelectric module is completed. The experimental evidence indicates that the thermoelectric generator indeed acts the kernel technology for waste heat transformed into renewable electricity. Through integrating the thermoelectric generator with heat-absorption material, heat-conduction material, and heat-dissipation material, it not only could lead high brightness 10W LED light bulb to reach the lowest LED junction temperature (71℃), but also produce the renewable electricity (104.44mW) by transforming the waste heat from high brightness LED.

並列關鍵字

thermoelectric chip ； microelectric energy storing ； LED heat dissipation

參考文獻

[1]M.W. Shin, “Thermal design of high-power LED package and system”, Proc. SPIE, Vol. 55, pp. 9-21(2006).

[2]C.M. Lai, C.M. Chiang, and C.J. Ho, “Thermal performance of an indoor oblong LED lighting prototype incorporating heat pipes”, Journal of Asian Architecture and Building Engineering, Vol. 8, pp. 585-592 (2009).

[4]S.H. Jang and M.W. Shin, “Thermal analysis of LED arrays for automotive headlamp with a novel cooling system”, IEEE Transactions on Device and Materials Reliability, Vol. 8, pp. 143-147 (2008).

[5]S.Y. Hu and Y.X. Qin, “A general photo-electro-thermal theory for light emitting diode (LED) systems”, IEEE Transactions on Power Electronics, Vol. 24, pp. 81-85 (2009).

[6]X. Long, R. Liao, and J. Zhou, “Development of street lighting system-based novel high-brightness LED modules”, IET Optoelectronics, Vol. 3, pp. 40-46 (2009).