应用光学, 2017, 38 (4): 599, 网络出版: 2017-10-12
高显色指数白光LED光源的研究
White-light LED clusters with high color rendering index
发光二极管 脉冲宽度调制 显色指数 色温可调 light emitting diode pulse width modulation color rendering index tunable color temperature
摘要
根据光源混合原理和模拟黑体轨迹的Chebyshev法, 推导了三通道脉冲宽度调制(PWM)占空比与色坐标、光通量、相对色温之间的关系式, 同时确定调光约束条件。在上述推导公式基础上, 设计出一种智能调光控制系统, 该系统通过手机客户端分别控制暖白/绿/蓝3种LED光源模组, 实现高显色指数Ra下混合白光的调光调色。实验结果表明: 设置光源色温为3 600 K时, 光通量在600 lm之内, 设定值与测试值最大误差为0.74%; 当光源光通量设定为300 lm时, 色温在[3 200,7 600]之间连续可调, 其最大误差为1.82%, 且光通量波动小于4%; 混合光源具有较高的显色指数, 在调光范围内, 一般Ra在90以上, 最大可达95.3。
Abstract
Based on light-mixing technology and Chebyshev method of simulating Planckian locus, the relationships between chromaticity coordinate, luminous flux, relative color temperature and duty ratio of three-channel pulse width modulation (PWM) are derived in the paper, and limitation of three channels’ PWM dimming is established. On the basis of this method, intelligent light-control system is designed, which can realize dimming and tunable color temperature of white-light LED clusters [the warm white/green/ blue (WW/G/B)]with high color rendering index (CRI) Ra by mobile client. Experiments show that maximum flux error between the setting value and the test value is 0.74% while the correlated color temperature (CCT) of the LED clusters is 3 600 K and the luminous flux is less than 600 lm. The deviation mean of CCT is less than 1.82% and luminous flux fluctuation is no more than 4% while the luminous flux is 300 lm and the range of CCT is from 3 200 K and 7 600 K. Meantime, CRI is generally more than 90, and the maximum value is 95.3 in the tunable range of the white-light LED clusters.
柳建新, 田会娟, 洪振, 刘欢. 高显色指数白光LED光源的研究[J]. 应用光学, 2017, 38(4): 599. Liu Jianxin, Tian Huijuan, Hong Zhen, Liu Huan. White-light LED clusters with high color rendering index[J]. Journal of Applied Optics, 2017, 38(4): 599.