LED照明系统光色度控制技术的研究

发布时间：2018-07-13 11:39

【摘要】：近年来LED照明产业不断发展,LED以光效高、亮度可调、易控制、寿命长、色彩多样等特点,逐渐进入了通用照明的领域。随着技术的发展和人们对生活品质要求的提高,色温可调、高显色性、智能LED照明系统逐渐受到人们的重视。针对目前LED应用存在着色温调节不精确、显色性差、控制不方便等不足,本文对冷暖白光LED混合获得色温可调白光的方法、多基色LED芯片提高光源显色性、WRGB-LED模块获得宽色温可调高显色性白光的方法、室内照明控制系统设计等四个方面进行了较为完整的理论分析与工程设计,并进行相应的实验。本次课题完成的主要内容包括以下几个方面:研究了双通道脉冲宽度调制的冷暖白光LED混色模型,推导出采用冷暖白光LED混合的LED模块在双通道脉冲宽度调制下的色温、最大光通量、显色指数的简捷计算公式。采用暖白光(色温3282K)和冷白光(色温12930K)两种白光LED进行混色实验,通过单片机控制脉冲宽度实现占空比可调。结果显示理论计算与实验值误差小,证明该模型调光的精确性。研究了多基色LED芯片提高光源显色指数,基于测色法编写混合白光参数模拟计算软件。将实验测量得到的冷、暖白光及单色LED的光谱导入程序进行模拟计算,得到不同色温下合成光源显色指数的最大值,以及所对应的各种LED配比数量。结果表明,暖白光LED与红、绿、蓝LED合成可以获得色温介于3500K到12300K、显色指数Ra介于92.0到97.7的白光;与红、绿、青LED合成可以获得显色指数Ra介于95.0到97.8的低色温白光(3500K-4500K)。冷白光LED与红、绿、青LED合成可以获得显色指数Ra介于90.9到98.4的高色温白光(8200K-13000K)。对理论计算的色温为7803K和显色指数Ra为97.29的LED配比数量进行实际制作,实验测量结果为色温7992K,显色指数Ra为97.1。研究了WRGB-LED模块得到宽色温动态变化且高显色性混合白光。采用暖白与红绿蓝三基色LED混合、脉冲宽度调制驱动,及优化的遍历范围,得到了高显色性、宽色温可调的LED合成白光。根据模拟计算结果进行实验验证,获得了色温从2572K至12585K的很大范围内准连续变化的混合白光,色温变化平均间隔为193K,并且显色指数Ra都能保持在93至96之间。完成基于Zigbee、Wifi的室内照明控制系统的整体设计。采用C#语言编写了PC端照明控制软件,引入RGB混光、色温调节、显色指数优化算法,实现LED灯具的无线控制、色温调节、亮度调节、颜色变化等基本功能。
[Abstract]:In recent years, LED lighting industry has been developing continuously, with the characteristics of high light efficiency, adjustable brightness, easy control, long life and various colors, LED has gradually entered the field of general lighting. With the development of technology and the improvement of people's quality of life, the color temperature can be adjusted, and the intelligent LED lighting system has been paid more and more attention. In view of the shortcomings of the current LED applications such as inaccurate color temperature adjustment, poor color rendering and inconvenient control, this paper deals with the method of obtaining the white light with adjustable color temperature by mixing the cold and warm white LED. The method of obtaining white light with wide color temperature and high color rendering by WRGB-LED module based on multi-primary color LED chip is discussed. Four aspects of indoor lighting control system design, such as theoretical analysis and engineering design, are carried out, and corresponding experiments are carried out. The main contents of this paper include the following aspects: the color mixing model of cold and warm white LED with double channel pulse width modulation is studied, and the color temperature of LED module with cold and warm white light LED mixed with double channel pulse width modulation is deduced. A simple formula for calculating the maximum luminous flux and color index. Two kinds of white LED with warm white light (color temperature 3282K) and cold white light (color temperature 12930K) were used for color mixing experiment. The pulse width was controlled by single chip microcomputer to realize the duty cycle adjustable. The results show that the error between the theoretical calculation and the experimental value is small, which proves the accuracy of the dimming of the model. The multi-primary color LED chip is studied to improve the color index of light source. Based on the method of color measurement, the simulation and calculation software of mixed white light parameters is developed. The spectral introduction program of cold, warm white and monochromatic LED was simulated and calculated. The maximum color index of synthetic light source at different color temperature and the corresponding number of LED ratios were obtained. The results show that the synthesis of warm white LED with red, green and blue LED can obtain white light with color temperature between 3500K and 12300K, color index Ra between 92.0 and 97.7, and low temperature white light (3500K-4500K) with red, green and green LEDs. The synthesis of cold white LED with red, green and green LED can obtain high color temperature white light (8200K-13000K) with Ra between 90.9 and 98.4. The experimental results show that the color temperature is 7992K and the chromogenic index Ra is 97.1. The experimental results show that the color temperature is 7803K and the chromogenic index Ra is 97.29. The experimental results show that the color temperature is 7992K and the chromogenic index Ra is 97.1. The dynamic change of wide color temperature and high color rendering of mixed white light were studied in WRGB-LED module. Using warm white and red, green and blue trichromatic LED, pulse width modulation drive, and optimized traversal range, the white LED with high color rendering and adjustable wide color temperature is obtained. According to the experimental results, the mixed white light with a wide range of color temperature ranging from 2572K to 12585K is obtained. The average interval of color temperature variation is 193K, and the chromogenic index Ra can be kept between 93 and 96. The whole design of indoor lighting control system based on ZigbeeWifi is completed. The PC lighting control software is programmed with C # language, and RGB mixed light, color temperature adjustment and color index optimization algorithm are introduced to realize the basic functions of LED lamps such as wireless control, color temperature adjustment, luminance adjustment, color change and so on.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM923.34

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