高功率LED熱逸散因子之實驗量測研究

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高功率LED熱逸散因子之實驗量測研究

Experimental Investigation of Heat Dissipation Factors for High-Power LEDs

黃正宏 , Masters　　Advisor：周榮源　　

繁體中文

熱逸散因子；高功率LED ；量測方法；光通量； Heat dissipation factors ； High-power LED ； Light intensity ； Experimental measure

Abstract │ Reference (24) │ Altmetrics

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Heat generations were inevitable transport phenomenon of high-power LED lighting. While high-power LEDs in operation can produce high luminance, but they also generate significant heat at the same time. The optical output of the LED is sharply degraded with the increase in junction temperature because the high temperature significantly influences the reliability and durability of the LED.  
    The heat dissipation factor, Kh, for a lighting device is defined as heat dissipation from the lighting to total electrical input power of the lighting. It will be beneficial and critical to modeling and simulate thermal designs of lighting if the Kh factor of the specific LEDs is precisely obtained. In this study, a methodology is proposed and experiments are conducted to find the LEDs heat dissipation factors. Experiment procedures are changing the input powers to LEDs, and then gathering information by related instruments for the whole transient to steady states. Experimental results showed that, for two different brands of LEDs under test, different values of heat dissipation factor were found, and the optical outputs of luminous flux were affected by the value of heat dissipation factor. By using the simple method to measure the heat dissipation factor, the theoretice luminous flux can be evaluated; and comparing it to the luminous flux evaluated by the method of using a forward current model and a junction temperature model, the absolute error between these two results is less than 10%. It is expectable that the measured Kh factor will be helpful to thermal designs and characterizations of optical-thermal interdependence of LED lightings.

Reference ( 24 ) 〈TOP〉

[1]管鴻、許進明，2013，”LED及OLED照明”，科學發展，483，頁48~53，3月。
[2]劉世俊、劉超，2011，”大功率LED有源溫控系統的開發”，現代電子技術，24。
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[4]經濟部能源局廣告，2012，” LED照明節能應用技術手冊”，財團法人台灣綠色生產力基金會，12月。
[5]Y.X. Qin, Deyan Lin and S. Y. Hui, "A Simple Method for Comparative Study on the Thermal Performance of LEDs and Fluorescent Lamps ," IEEE Transactions on Power Electronics, 24(7), pp. 1811-1818 (2009).

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