三通道PWM的数控调光调色方法  

A Digital Dimming Color and Intensity Method of Three-channel LED

作　　者：骆伟岸 王晗[1] 陈新度[1] 曾耀斌 李志劲[2] 何锐国 LUO Wei-an;WANG Han;CHEN Xin-du;ZENG Yao-bin;LI Zhi-jin;HE Rui-guo(School of Electro-mechanical Engineering,Guangdong University of Technology,Guangzhou 510006,China;Department of Foshan Supervision Testing Center of Quality and Metrology,Foshan 528000,China)

机构地区：[1]广东工业大学机电工程学院,广东广州510006 [2]佛山市质量计量监督检测中心,广东佛山528000

出　　处：《发光学报》2018年第3期414-421,共8页Chinese Journal of Luminescence

基　　金：广东省科技计划(2015B010102014);"广东特支计划"科技青年拔尖人才项目(YQ2015056);广东省"质量工程"建设项目(SJJD006);广东省自然科学基金(2015A030312008);广东省公益研究项目(2015B010104006)资助~~

摘　　要：针对目前机器视觉光源存在工作时间长、需要现场工作人员手动调试、发热严重、适应能力差等问题,提出了一种基于PWM的数字控制光源,建立了混色光下三通道占空比与光照度的函数关系,分8种情况讨论,并分析了该模型的局限性。从调光原理、驱动原理和控制原理3方面详细说明了该数控光源的实现方法,并且对本文提出的数学模型进行了4种有代表性的实验测试。实验结果表明,该数学模型能满足大多数比例的混光模型,实现光源颜色、照度可调,上述问题均可得到良好的解决,同时提高光源寿命、节约能源。In machine vision,there are many problems exist in light-source,like long running times,manual debugging,heating seriously and poor adaptability.Accordingly,a digital dimming method of light source was proposed based on PWM technology,which was divided into eight situations.The limitation of this model was pointed out and the principals of the digital light-source was declared from three aspects:dimming theory,control theory as well as driving theory.In the meanwhile,four representative experiments were showed out.The results show that this method can satisfy most proportion of the mixed light models,and realize the adjustment of color as well as the change of illumination.With the function of trigger control,the above problems can be solved properly,at the same time,postponing aging of light-source and energy saving can be achieve as well.

关 键 词：光源 机器视觉 PWM 混光 LED 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]