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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。
High-power LED thermal problem is one of the technical bottlenecks restricting the stability, reliability and life of high-power LED. The effective low thermal resistance package LED thermal design is the key to improve LED performance. In this paper, we propose a copper-water circuit heat pipe (LHP) which is applied to the cooling of high-power LED. The effects of heating method, liquid filling rate, wind pressure and inclination angle on LHP soak temperature, starting resistance and thermal resistance were studied. The results show that when the input power is 30 W, the starting time of LHP is about 6.5min and the thermal resistance range is 0.48 ~ 1.62K / W. When the heat load is 30W, the temperature of the evaporator can be stably controlled at 75 ℃ ; The average temperature of the evaporator surface is controlled below 1.6 ℃; LHP best liquid filling rate of 60%; condenser side air pressure within a certain range (less than 130Pa), the greater the condenser side wind pressure, LED The better the thermal performance of the product.