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大功率LED封装散热技术研究 总被引:2,自引:1,他引:1
LED被称为第四代照明光源或者绿色光源,广泛地应用于手机闪光灯、大中尺寸显示器光源模块以及特殊用途照明系统,并将被扩展至一般照明系统设备.由于LED结温的高低直接影响到LED的出光效率、器件寿命、发光波长和可靠性等,因此如何提高散热能力是大功率LED实现产业化亟待解决的关键技术之一.介绍并分析了国内外大功率LED散热封装技术的研究现状,总结了其发展趋势并提出减少内部热沉的热阻可能是今后的发展方向. 相似文献
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目前大功率LED照明灯具的驱动电源主要使用集成电路作为电源驱动芯片,其扩展性能差、功能少。针对这些问题,作者基于STM32开发了一种多功能LED驱动电源,通过编程可以实现无级调光与自动温控散热两个扩展功能。测试结果表明:在额定电压为30V、额定电流为3.3A的负载下,输入电压从90V~264V变化时,驱动电源输出电压的波动范围为±1.5V,而输出电流波动范围为±0.11A,恒流特性较好,驱动电源的功率因数均值在0.95以上。 相似文献
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大功率LED灯有很多优点,而LED驱动电路对LED非常重要,LED驱动和调光是目前研究的热点。针对目前LED驱动电路的不足,设计了一种新颖的LED驱动电路,该电路以单端反激式开关电源为控制的第一级,压控制恒流源为第二级,可同时保证控制精度和效率。实验结果表明该电路效率高、功率大,同时电路还能自适应调光,更加节能可靠。 相似文献
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Study of Phosphor Thermal-Isolated Packaging Technologies for High-Power White Light-Emitting Diodes
Bingfeng Fan Hao Wu Yu Zhao Yulun Xian Gang Wang 《Photonics Technology Letters, IEEE》2007,19(15):1121-1123
A novel packaging configuration for high-power phosphor-converting white light-emitting diodes (LEDs) application is reported. In this packaging configuration, a thermal-isolated encapsulant layer was used to separate the phosphor coating layer from the LED chip and the submount. Experimental and finite-element method simulation results proved that this thermal management can prevent the heat of LED chip from transferring to the phosphor coating layer. The surface temperature of the phosphor coating layer is a 16.8degC lower than that of the conventional packaging at 500-mA driver current for 1-mm power GaN-based LED chip. Experimental results also show that this packaging configuration can improve the light-emitting power performance and color characteristics stability of the white LED, especially under high current operating condition. 相似文献
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文章分析了大功率LED的原理和工作特性,LED的特性也决定了驱动电源的性能要求,LED照明适合恒流源驱动。然后具体分析了LED驱动的几种匹配方式,包括全部串联、全部并联、混联、交叉阵列和分布式恒流架构。最后指出,对于大功率LED照明来说,分布式恒流是未来驱动电源的发展方向。 相似文献
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Micro heat pipe (MHP) is applied to implement the efficient heat transfer of light emitting diode (LED) device. The fabrication of MHP is based on micro-electro-mechanical-system (MEMS) technique, 15 micro grooves were etched on one side of silicon (Si) substrate, which was then packaged with aluminum heat sink to form an MHP. On the other side of Si substrate, three LED chips were fixed by die bonding. Then experiments were performed to study the thermal performance of this LED device. The results show that the LED device with higher filling ratio is better when the input power is 1.0 W; with the increase of input power, the optimum filling ratio changes from 30% to 48%, and the time reaching stable state is reduced; when the input power is equal to 2.5 W, only the LED device with filling ratio of 48% can work normally. So integrating MHP into high-power LED device can implement the effective control of junction temperature. 相似文献
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由于世界范围的能源短缺,近年来节能议题日趋受到重视。目前的照明设备为达到低功率消耗、寿命长、无污染、启动时间短等需求,已经大量采用高亮度的半导体固态发光二极管(LED)取代传统的照明光源。LED驱动器则提供恒定电流控制,使得LED维持稳定的发光亮度与饱和的色彩频谱,为了设计符合工业与节能标准的显示屏系统。LED驱动器必须有自动省电特性。 相似文献
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In order to study the role of printed circuit board(PCB)in high-power LED heat dissipation,a simple model of high-power LED lamp was designed.According to this lamp model,some thermal performances such as thermal resistances of four types of PCB and the changes of LED junction temperature were tested under three different working currents.The obtained results indicate that LED junction temperature can not be lowered significantly with the decreasing thermal resistance of PCB.However,PCB with low thermal res... 相似文献