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Simulator for assessing the performance of polychromatic LED light sources

机译：用于评估多色LED光源性能的模拟器

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摘要

The unique properties of light emitting diodes (LED) offer significant advantages in terms of lifetime, source control, and response time all of which are potentially very important for various illumination applications. However, a number of factors such as the initial variability of the optical properties in a batch, high temperature dependence of the intensity and color especially of the red and amber LEDs and spectral degradation causing gradual intensity decrease and shift in color, need to be considered when developing LED light sources. The degradation and temperature dependence of the LEDs can significantly affect the performance of a light source over the operating period in terms of intensity and color stability, and efficacy. This is especially critical for polychromatic LED light sources, consisting of different types of LEDs with different spectral degradation rates and temperature dependencies. Therefore, a method estimating the intensity and color as a function of the affecting factors could be a valuable tool for developing LED light sources for various applications. In this paper, we present a simulator employing model-based estimation of the LED color, intensity, and efficacy as a function of temperature, forward current, and spectral degradation. The models are derived from the measurements of the electrical and spectral characteristic of the individual LEDs as a function of the forward current, junction temperature and corresponding thermal properties of the packaging. The results show that the simulator provides accurate estimates of the intensity and color of the LED light sources as a function of the temperature and forward current.
机译：发光二极管（LED）的独特特性在使用寿命，光源控制和响应时间方面都具有明显的优势，所有这些对于各种照明应用而言都可能非常重要。但是，需要考虑许多因素，例如批次中光学特性的初始可变性，强度和颜色（尤其是红色和琥珀色LED）的强度和颜色的高温依赖性以及导致强度逐渐降低和颜色偏移的光谱退化。开发LED光源时。在强度，颜色稳定性和功效方面，LED的降级和温度依赖性会在整个工作周期内显着影响光源的性能。这对于由具有不同光谱退化率和温度依赖性的不同类型的LED组成的多色LED光源尤其重要。因此，作为影响因素的函数来估计强度和颜色的方法可能是开发用于各种应用的LED光源的有价值的工具。在本文中，我们提供了一个模拟器，该模拟器采用基于模型的LED颜色，强度和功效的模型估计，该估计是温度，正向电流和光谱退化的函数。这些模型是根据各个LED的电学和光谱特性的测量值得出的，这些测量值是正向电流，结温和封装的相应热特性的函数。结果表明，该仿真器根据温度和正向电流提供了LED光源强度和颜色的准确估计。

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