发光学报, 2019, 40 (12): 1538, 网络出版: 2020-01-09   

基于PWM调光的高显色性白光LED混光优化方法

Optimization Dimming Method of Mixed Light for White Light Emitting Diode with High Color Rendering Index Based on Pulse Width Modulation
田会娟 1,2,*胡阳 2,3陈陶 2,3柳建新 4蔡敏鹏 1,2关涛 1,2
作者单位
1 天津工业大学 电气工程与自动化学院, 天津市电工电能新技术重点实验室, 天津 300387
2 大功率半导体照明应运系统教育部工程研究中心, 天津 300387
3 天津工业大学 电子与信息工程学院, 天津 300387
4 天津成科传动机电技术股份有限公司, 天津 300384
摘要
提出了一种基于脉冲宽度调制(PWM)的红/绿/蓝/暖白(R/G/B/WW) 四色发光二极管(LED)白光混合方法。该方法根据多基色混合白光光源相对光谱功率分布(SPD)符合线性叠加原理, 采用1931 CIE-XYZ三刺激值建立混合光中各光源色坐标与贡献率的关系。在优化目标显色性能最佳时, 建立混合光的光通量与占空比的函数关系, 并采用R/G/B/WW 四色LED进行实验验证。结果表明, R/G/B/WW LED模块可实现一般显色指数Ra在95以上、其最大相对误差为1.35%、相关色温在3 000~7 000 K、光通量为200~1 000 lm、发光效率在170~240 lm/W 范围变化的白光调节。
Abstract
This paper proposes a method of white light mixed for red/green/blue/warm-white (R/G/B/WW) light emitting diode (LED) based on pulse width modulation (PWM). According to the principle of linear superposition of the relative spectral power distribution (SPD) of multi-color white LED, the proposed model adopts 1931 CIE-XYZ tristimulus to determine the relationship between the color coordinate and the rate of contribution for each channel of the LED clusters. When the color rendering performance is optimized, the functional relationship between luminous flux and duty cycles of the mixed light is established. And the experimental verification is carried out with R/G/B/WW LED clusters. The experimental results show that R/G/B/WW LED model can realize that the color rendering index Ra is larger than 95 and its maximum relative error is 1.35%, the correlation color temperature (CCT), the luminous flux and the luminous efficiency change in the range of 3 000~7 000 K, 200~1 000 lm, 170~240 lm/W, respectively.
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田会娟, 胡阳, 陈陶, 柳建新, 蔡敏鹏, 关涛. 基于PWM调光的高显色性白光LED混光优化方法[J]. 发光学报, 2019, 40(12): 1538. TIAN Hui-juan, HU Yang, CHEN Tao, LIU Jian-xin, CAI Min-peng, GUAN Tao. Optimization Dimming Method of Mixed Light for White Light Emitting Diode with High Color Rendering Index Based on Pulse Width Modulation[J]. Chinese Journal of Luminescence, 2019, 40(12): 1538.

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