LED陣列車頭燈散熱元件之數值分析與實驗量測之研究

Study on The Thermal Management for A Car LED Array Headlamp Using Numerical Analysis and Experimental Validation

謝鴻銘(Mung-Ming Hsieh)

指導教授 ： 江卓培

國立虎尾科技大學/工程學院/機械與機電工程研究所/碩士(2011年)

https://doi.org/10.6827/NFU.2011.00072

摘要

近年由於高功率LED（High Bright Light Emitting Diode）的迅速發展，其具備低耗能、壽命長、環保、反應速率快、輕薄、尺寸小，能增加燈具設計的自由度等優點，使其更被廣泛應用如路燈、手術燈、汽機車之霧燈及大燈等。但其最大問題在於單位面積的二極體中產生大量的熱量，此容易造成二極體因溫度過高而容易損壞元件，因此如何有效的將熱量移除，將有助於LED晶片壽命的增加。
將熱量自二極體移除，可分為自然對流及強制對流兩種方式，自然對流領域中常見的元件有散熱鰭片、熱管、鑽石薄膜等，其中散熱座（Heat Sink）一種最簡單可直接應用的散熱元件。強制對流常見的散熱元件有風扇、液冷循環系統、熱電致冷晶片等，其原理大多是利用強制對流帶走系統或空間中的熱量，有鑑於台灣的開車環境，本論文將以強制對流為主要設計目的。
本文將針對如何有效的將熱量移除進行探討，並以ANSYS進行本研究所設計的散熱模組及散熱方式進行模擬分析並與實驗結果作比較，以驗證本文所設計之模組的可行性。由於環保意識的提高，LED的廣泛應用尤為重要，尤其LED車頭燈近年來吸引各大車燈廠爭相積極投入研發，所以專利取得成為日後獲利的一種保障，本文亦針對強制散熱進行專利的探討，避免無意間落入他人專利陷阱、或觸犯他人之專利。

關鍵字

高功率LED ； 強制對流 ； 專利分析

並列摘要

High-power LED (Light Emitting Diode) is rapid developing because of its low power consumption, long life, high response time and small size. It was packaged to instead of light ball and lamp in recent years. The potential applications of the high-power LED in street light, surgical light or headlight of car and motorcycle become extremely attractive. However, it’s well known that almost of 60-80% input driving current produce heat, resulting high temperature releasing to chip of LED. The chip may damage if a large amount of exothermal temperature can not be effective removed. Therefore, a plenty of cooling devices such as heat sink and heat pipe were designed to avoid the damage of LED chip using numerical simulation and experimental validation.
The design methodologies of cooling device can be divided into natural convention and forced convention. Most of commercial devices employed natural convention method and were proved that it cannot remove the junction temperature between chip and the surface of cooling device and decreasing the emitting light intensity. Therefore, a few of research concerning the Taiwan environment was conducted to applying forced convention method in cooling device development.
The aims of this research are to design a cooling device for car headlamp numerically and experimentally, and to verify the possibility of claiming patent. Two models were conducted, one is using 3 pieces of high-power LED adhesive on the proposed cooling device and another is 5 pieces. Both convention methods were used to compare the cooling efficiency and the difference between simulation prediction and practical reality. As a result, natural convention method cannot remove junction temperature in both models. The proposed device using forced convention method can cool down junction temperature in 2 minutes from 89ºC to room temperature.

並列關鍵字

high-power LED ； forced convention ； patent analysis

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