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摘要:
为提供高品质、智能健康的照明光源，基于三基色LED光源构建了线性调光混合照明系统，并提出一种调光调色的优化方法。混合光源的光色度和光强度分别用色温和明度等级来设定，使得混合照明效果更加符合“人因照明”的需求。在系统的智能优化配光过程中，将色温转化为CIE
$ {u}'{v}' $ 色度坐标，明度转化为亮度，使优化计算更加精确。该系统采用线性调光的方式，既能有效避免混合光源闪烁带来的健康安全问题，配合优化算法又有效解决了线性调光色度漂移大的问题。实验结果表明，在2000 K~8000 K的色温范围内，混合照明系统混合光的色度稳定性保持在1阶CIE$ {u}'{v}' $ 圆内，在对应色温下的整个光强度调节范围内无可察觉的色差。采用线性调光方式在保持光色度稳定上比脉冲宽度调光方式效果更佳。理论探究和实验结果表明该混光照明系统简易可行，具有较高的实用价值。Abstract:To provide high-quality, intelligent, and healthy lighting sources, a linear dimming mixed lighting system is constructed using three-primary-color LED light sources. An optimization method for dimming and color mixing is proposed. The light chromaticity and light intensity of the mixed light source are set by color temperature and brightness level, which makes the mixed lighting effect more in line with the demand of "human-centric lighting". In the intelligent optimization of the system, the color temperature is converted into CIE
$ {u}'{v}' $ chromaticity coordinates, and the brightness is converted into luminance to make the optimization calculations more accurate. The system adopts the linear dimming method, effectively avoiding the health and safety hazards caused by light source flicker, and effectively solves the problem of large linear dimming chromaticity drift with an optimization algorithm. Experiment results demonstate that the chromatic stability of the mixed light in the mixed lighting system is maintained within the first step of the CIE${u}'{v}' $ chromaticity diagram in the color temperature range of 2000 K−8000 K. Moreover, the system exhibits imperceptible color deviation over the entire range of light intensity adjustments at the corresponding color temperature. This finding also indicates that linear dimming is better than the pulse-width dimming method in keeping the optical chromaticity stable. Theoretical exploration and experimental results demonstrate that the mixed lighting system is simple and feasible, with significant practical value. -
图 1CIE 1931xy色度图。（a）黑体轨迹及相关色温等温线；（b）三基色混光区域图及色漂移示意图
Figure 1.CIE 1931xychromaticity diagram. (a) Blackbody locus and correlated color temperature isotherms; (b) three primary colors mixed lighting region diagram and color draft schematic
图 2CIE1931xy色度图上的10阶麦克亚当椭圆
Figure 2.10-step MacAdam ellipse in CIE1931xychromaticity diagram
图 3CIE 1976
$ {u}'{v}' $ 色度图上的5阶$ {u}'{v}' $ 圆Figure 3.5-step
$ {u}'{v}' $ circle on the CIE 1976$ {u}'{v}' $ chromaticity diagram
图 7CIE
$ {u}'{v}' $ 圆表示的照明系统色度稳定性。Figure 7.Chroma stability of the lighting system represented by CIE
$ {u}'{v}' $ circle.
图 86500 K下照明系统色度稳定性比较。（a）线性调光；（b）PWM调光
Figure 8.Comparison of chroma stability of lighting systems at 6500 K. (a) Linear dimming; (b) PWM dimming
表 1三基色LED光源数据
Table 1.Data of three-primary-color LED light sources
光源类型 x y 亮度值
/cd·m−2电流值/mA Red LED 0.6636 0.3112 34.33 157.9 Green LED 0.1837 0.7164 74.26 183.5 Blue LED 0.1464 0.0450 12.55 185.3 
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表 2三基色LED线性调光混合照明的色度稳定性
Table 2.Chroma stability of mixed lighting based on Linear dimming of three-primary-color LEDs
100%明度
下的色温/K0~100%明度对应
色温范围/K最大
色温差/K$ {u}'{v}' $
色差阶数 2700 2692~2711 19 0.0010 1 3000 2992~3006 14 0.0005 1 3500 3486~3513 27 0.0008 1 4000 3989~4006 17 0.0004 1 5000 4994~5012 18 0.0003 1 6500 6483~6517 34 0.0002 1 下载:
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表 3三基色LED光源在
$ {T}_{{\mathrm{C}}} $ =6500 K时不同明度下的电流及$ {u}'{v}' $ 坐标值Table 3.The currents and
$ {u}'{v}' $ coordinate values of three-primary-color LED light sources under different brightnesses at$ {T}_{{\mathrm{C}}} $ =6500 K明度
等级/%红光LED
电流值/mA绿光LED
电流值/mA蓝光LED
电流值/mA$ {u}' $ $ {v}' $ 10 62.10 75.30 37.19 0.2004 0.4657 20 78.40 93.90 47.33 0.2003 0.4656 30 93.80 111.9 56.65 0.2004 0.4656 40 106.5 129.6 65.35 0.2004 0.4656 50 115.6 144.2 69.85 0.2004 0.4656 60 124.3 149.2 76.26 0.2006 0.4654 70 132.0 159.3 80.94 0.2004 0.4656 80 144.3 169.5 85.20 0.2003 0.4657 90 150.0 181.7 91.29 0.2004 0.4655 100 153.4 179.7 89.71 0.2005 0.4656 下载:
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表 4三基色LED的PWM调光混合照明的色度稳定性
Table 4.Chroma stability of mixed lighting based on PWM dimming of three-primary-color LEDs
100%明度
下的色温/K0~100%明度对应
色温范围/K最大
色温差/K$ {u}'{v}' $
色差阶数 2700 2653~2752 99 0.0034 3 3000 2940~3058 118 0.0036 3 3500 3432~3554 122 0.0033 3 4000 3964~4198 234 0.0037 3 5000 4933~5079 146 0.0038 3 6500 6403~6590 187 0.0037 3 下载:
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