基于三基色LED的线性调光混合照明

黄涛; 夏振平; 彭子雄; 刘宇杰; 李超超; 顾敏明

doi:10.37188/CO.2023-0084

基于三基色LED的线性调光混合照明

doi: 10.37188/CO.2023-0084

苏州科技大学电子与信息工程学院, 江苏苏州 215009

基金项目: 国家自然科学基金（No. 62002254）；江苏省自然科学基金（No. BK20200988）

详细信息

作者简介:
黄　涛（1998—），男，江西丰城人，硕士研究生，2021年于九江学院获得学士学位，主要从事智能照明和健康照明的研究。E-mail：htao2021998@163.com

夏振平（1985—），男，江苏兴化人，副教授，硕士生导师，2014年于东南大学获得博士学位，主要从事视觉相关的显示和照明质量的测量、评价和优化方面的研究。E-mail：xzp@usts.edu.cn

中图分类号: TN206
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出版历程
- 收稿日期: 2023-05-09
- 修回日期: 2023-05-19
- 网络出版日期: 2023-09-21

Mixed lighting based on the linear dimming of three-primary-color LEDs

College of Electronics and Information Engineering, Suzhou University of Science and Technology, Suzhou 215009, China

Funds: Supported by the National Natural Science Foundation of China (No. 62002254); the Natural Science Foundation of Jiangsu Province, China (No. BK20200988)

More Information

Corresponding author: xzp@usts.edu.cn

摘要

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。
- 三基色LED /
- 混合照明 /
- 线性调光 /
- 人因照明 /
- 色差 /
- CIE $ {u}'{v}' $圆
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.
- three-primary-color LEDs /
- mixed lighting /
- linear dimming /
- human-centric lighting /
- chromatic aberration /
- CIE $ {u}'{v}' $ circle

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图 1 CIE 1931 xy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 1931 xy chromaticity diagram. (a) Blackbody locus and correlated color temperature isotherms; (b) three primary colors mixed lighting region diagram and color draft schematic

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图 2 CIE1931 xy 色度图上的10阶麦克亚当椭圆

Figure 2. 10-step MacAdam ellipse in CIE1931 xy chromaticity diagram

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图 3 CIE 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

下载: 全尺寸图片幻灯片

图 4 明度与亮度的关系曲线

Figure 4. The relationship between brightness and luminance

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图 5 电流控制信号查找流程图

Figure 5. Retrieval flowchart of the current control signal

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图 6 LED光源相对光谱功率分布

Figure 6. Relative spectral power distribution of LED light sources

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图 7 CIE$ {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

下载: 全尺寸图片幻灯片

图 8 6500 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

下载: 全尺寸图片幻灯片

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/K	0~100%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

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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

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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/K	0~100%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

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