LED性能优化
在过去的几年中,现代LED的改进功效,使工程师能够使用较少的芯片在他们的照明灯具,以实现相同的光输出作为旧的设计。关键的好处是降低成本和更简单的设计。今天的芯片增强鲁棒性允许工程师采取的方法进一步提高了当前进一步推动个人LED光度和削减他们的数量甚至进一步在一个给定的设计(见文章“LED亮度区最大化降低系统成本”)。
然而,尽管LED亮在更高的驱动电流,增加亮度来降低成本的效果(筹码在相对较低的电流,表现出最高的效能看高新区第“识别LED效率下降的原因)。这增加了功耗,并否定一些组件的成本降低的照明灯具的寿命的收益。功耗的增加也导致芯片运行热,缩短其寿命。
本文介绍了成本之间的权衡,设计简单,功耗和长寿为一个给定的LED应用程序运行在高驱动电流。
Finding the limit
In the early days of LEDs, when the fledgling technology delivered less light and was much more fragile than today, engineers were advised to limit the drive current to LEDs in order to maximize efficacy and prolong the life of the devices.
However, two decades of development (Figure 1) has seen LED efficacy soar and tolerance to the high-junction temperatures that result from increased drive current significantly increase. Many engineers question why low-drive currents are still necessary when such currents limit a chip’s output to only a fraction of its capability.
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