Influence of Power Effect on The Thermal Resistance of Power LED

DAI Shu-chun

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Influence of Power Effect on The Thermal Resistance of Power LED

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- Influence of Power Effect on The Thermal Resistance of Power LED
- Chinese Journal of Luminescence Vol. 31, Issue 6, Pages: 877-881(2010)
- 作者机构：
  
  漳州职业技术学院电子工程系,福建漳州,363000
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN312.8
- Received：02 November 2009，
  
  Revised：2009-12-31，
  
  Published Online：22 November 2010，
  
  Published：22 November 2010
- 稿件说明：
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戴树春. 功率效应对功率LED热阻的影响[J]. 发光学报, 2010,31(6): 877-881

DAI Shu-chun. Influence of Power Effect on The Thermal Resistance of Power LED[J]. Chinese Journal of Luminescence, 2010,31(6): 877-881
戴树春. 功率效应对功率LED热阻的影响[J]. 发光学报, 2010,31(6): 877-881 DOI：

DAI Shu-chun. Influence of Power Effect on The Thermal Resistance of Power LED[J]. Chinese Journal of Luminescence, 2010,31(6): 877-881 DOI：

摘要

分析比较了在不同输入功率条件下1WGaN基LED样品的热学特性

得出了有效热阻随加载功率的变化规律。基于瞬态热测试方法

讨论了结-环境热阻与输入功率之间的关系。加载电流为100~500mA的区域随着电功率增加

有效热阻明显降低;当电流增至500mA以上时

有效热阻减小幅度越来越小;而当加载电流为900~1650mA时

结-环境的热阻随着电功率的增加而缓慢升高。随着注入电功率的增加

在不同电流区域同一个样品的热阻变化趋势却是相反的

这个现象归因于串联电阻热耦合随输入功率的变化。该结果对分析功率型LED热特性具有一定参考价值。

Abstract

We analyze the thermal characteristics of 1 W GaN-LED as function of input power. Based on the transient thermal measurement

the relationship of junction-ambient thermal resistance and input power is discussed. The thermal resistance and the thermal capacitance in the heat flow path can be captured by the diffe-rential structure function and cumulative structure function

offering reliable evidence for thermal management. The devices exhibit a decrease of effective thermal resistance from 14.3 K/W to 12.5 K/W when the input current increases from 100 mA to 500 mA at the heatsink temperature of 25 ℃. However the effective thermal resistance gradually decrease from 12.5 K/W to 12.3 K/W with the input current from 500 mA to 800 mA. On the other hand

when the input current increases from 900 mA to 1 650 mA

the change trend is completely opposite

while the device exhibits an increase of effective thermal resistance from 14.7 K/W to 15.4 K/W. With the same devices

the different trends of thermal resistance go with different current regions. All packaged LEDs can be simplified to the model composed of an ideal diode and a series resistance.

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Keywords

references

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