| 宋鹏程,文尚胜.基于三通道脉冲宽度调制的LED调光调色[J].光电子激光,2015,26(5):839~846 |
| 基于三通道脉冲宽度调制的LED调光调色 |
| A dimming method for LEDs based on three-channel pulse width modulation |
| 投稿时间：2015-01-14 |
| DOI： |
| 中文关键词: 发光二极管(LED) 动态色温 重心原理 脉冲宽度调制(PWM) 占空比 |
| 英文关键词:light emitting diode (LED) dynamic color temperature gravity principle pulse width modulation (PWM) duty cycle |
| 基金项目:广东省战略性新兴产业专项(2011A081301017,2012A08034012,2012A080304001)和广州市 科技计划(2013J4300021)资助项目 (1.华南理工大学 高分子光电材料与器件研究所,广东 广州 510640； 2.发光材料与器件国家重点实验室,广东 广州 510640) |
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| 中文摘要: |
| 为了实现发光二极管(LED)的精确调光,根 据重心原理,结合脉冲宽度调制(PWM),推导出混合光的色品坐标 与占空比的函数关系；采用红/绿/蓝、红/绿/冷白和暖白/绿/蓝3种LED光源模块进行 实验验证,并且 以光效、显色指数和最大光通量3个指标对混光效果进行评价。实验结果表明:建议的计算 模型能精确地指导LED的光 色调节,混合光的色品坐标的设定值和测量值之间的误差小于0.002,色温误差在50 K以内。 用光谱丰富的 冷白和暖白LED分别代替红/绿/蓝光源模块中的蓝光和红光,能提高混合光的显色指数,暖 白/绿/蓝光源模块的混光效果最佳。 |
| 英文摘要: |
| More and more attention has been paid to the lighting sources with intelligent dimming according to the psychological and physiological states of people.To rea lize accurate dimming of light-emitting diode (LED),this paper deduces a functional relationship betw een chromaticity coordinate and three channels′ duty,according to gravity principle and the characteristics of pulse width modulation (PWM) dimming, where the luminous flux is proportional to the duty cycle.This functional r elationship has been verified by light mixing experiments with red green blue(R /G/B),red green cold white(R/G/CW)、warm white green blue(WW/G/B) LED modules,and the dimming effects with effici ency of light,color rendering index and maximum luminous flux are evaluated.The results show that th is model with the advantage of high precision can be applied to various types of LED dimming colors,the deviation of chromaticity coordinate is less than 0.002between the set value and the measured value,and the deviati on of color temperature is less than 50K.Using cold white or warm white LED with plentiful spectra instead of blue and green LEDs in R/G/B module is conducive to improve the color rendering index of mixed light.It is o bserved that WW/G/B LED module has the best dimming effect. |
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