高功率發光二極體應用於側光式天花板燈具之熱管理研究

A Study on the Thermal Management of a High Efficiency LED Indirect Ceiling Lighting

楊國泰(Kuo-Tai Yang)

中原大學/工學院/機械工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100611

摘要

近年來，因為地球暖化的問題，造成全球氣候異常帶來無可估算的經濟損失，為減緩地球暖化問題節約能源是最直接且有效的方法。
就目前全球能源分佈來看，照明能源佔全球能源消耗相當重要的比例，但現今照明能源的使用卻極不具效率，要如何推行新一代的綠色照明光源便成為一項極重要的工作。其中半導體結合光電技術所發明的發光二極體（LED）光源，相較於傳統光源更多了能源使用率高、使用壽命長、無規範限制之有害物質等優點，因而被各方看好將取代傳統光源成為未來照明之光源。
所以本文主要運用高亮度發光二極體取代現有室內辦公室輕鋼架照明燈具光源，從開始選定使用的LED進行相關特性之量測實驗，確認當LED驅動電流為300 mA時，所對應的接點溫度為74 °C，熱阻值為47.75（°C/W）；而當LED驅動電流改變為350 mA時，所對應的接點溫度為91 °C，熱阻值為52.63（°C/W）。接著再建構不同散熱機構數值模型，並利用此數值模型進行熱流模擬尋找最佳化設計。完成後與實際實驗進行比對，兩者誤差值在1.55％，模擬的結果可為接受。
其後則是設計整體燈具機構與製作電路，並決定燈具所使用之驅動電源，進行穩定性測試。最後量測組裝完成之LED照明燈具光學及電子等相關特性，進而與傳統日光燈管型燈具比較，結果顯示發光效率部份，本文所設計之燈具較傳統燈具高42％，而消耗功率部份，傳統燈具比本文所設計之燈具高46％。綜合以上之研究分析，期望可用於未來開發LED照明產品的參考依據。

關鍵字

LED ； LED照明 ； CFD ； 數值模擬

並列摘要

In recent years, the global warming has caused global climatic anomalies, resulting in losses beyond estimation. Conserving is the most direct and effective way to mitigate the problem of global warming.
From the perspective of the global energy distribution, lighting accounts for a considerable proportion of total global energy consumption. Nevertheless, the current lighting is highly inefficient in energy consumption. Hence, how to implement the new generation of green lighting sources has become a very important task. Due to advantages such as higher energy efficiency, longer service life and having no hazardous substances specified by standards, LED lighting sources invented by integrating semiconductor and photoelectric technologies are widely believed as a promising lighting source to replace traditional light sources in the future.
This study used the high-brightness LED to replace the current indoor office lighting sources enclosed by light steel frames. These LEDs were used for experiments of measuring relative properties, confirming that the contact point temperature was 74 °C; the thermal resistance was 47.75 (°C/W) in case of LED driving current of 300 mA. The results confirmed that, when the LED driving current was changed to 350 mA, the corresponding contact temperature was 91 °C and the thermal resistance was 52.63 (°C/W). This study then constructed different numerical models for the thermal management and used the models for heat flow simulation to find out the optimal design. The comparison of the simulation results and the actual experimental results showed that the error value of the two was 1.55%, indicating that the simulation results were acceptable.
Subsequently, overall design of the proposed lighting device and the making of circuit as well as determination of the driving power of the lighting device were setup for stability test. Finally, this study measured the optical and electronic properties of the assembled LED lighting device to compare with the traditional fluorescent tube lamps. The results showed that the proposed lighting device was 42% higher than the traditional light in light-emitting efficiency, and was 46% higher than the traditional light in power consumption. The findings of this study can provide a reference for the future development of LED lighting products.

並列關鍵字

CFD ； Numerical Simulation ； LED ； LED Lighting

參考文獻

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