中文摘要：

大功率LED热问题是制约大功率LED的稳定性、可靠性和寿命的技术瓶颈之一,有效的低热阻封装LED热设计是提高LED性能的关键。本文提出一种应用于大功率LED散热的铜-水回路热管（LHP）,研究了加热方式、充液率、风压和倾角等对LHP均温性、起动性和热阻等的影响。研究结果表明：在输入功率为30 W时,LHP的启动时间约为6.5min;热阻范围为0.48~1.62K/W;在热负荷为30 W时,蒸发器的温度可以稳定控制在75℃以下;蒸发器表面均温差被控制在1.6℃以下;LHP的最佳的充液率为60%;冷凝器侧风压在一定范围内（小于130Pa）时,冷凝器侧风压力越大,LED产品的散热性能越好。

英文摘要：

An effective thermal design of light-emitting diode （LED） packaged with low thermal resist- ance is critical to improve the performance of LED. A copper/water unit loop heat pipe （LHP） heat sink is designed. The thermal capabilities, including start-up performance, temperature uniformity and thermal resistance,are investigated experimentally at the conditions of different heating methods, filling ratios, wind pressures,and incline angles. The obtained results indicate that the start time of the loop heat pipe is about 6.5 rain with the input power of 30 W; the thermal resistance of the loop heat pipe is in the range of 0. 48--1.62 K/W;when the heat load is 30 W,the temperature of the evaporator can be con- trolled steadily under 75 ℃ ;the difference of surface temperature of the evaporator is controlled nearly under 1.6℃ ,and the junction temperature is at the minimum when the filling ratio is about 60%. With- in a certain range of the wind pressure （less than 130 Pa）,the more the wind pressure is strengthened , the more the heat dissipation of LED products can be improved.