提高LED稳定性的高精度数控恒流源  

Design of a High Precision Digital Constant-current Source for improving the Stability of LED

作　　者：王南[1] 徐晓洁[2] 叶楠[1] 崔志立[1] 张晔晖[1] 

机构地区：[1]北京中国农业大学信息与电气工程学院,100083 [2]北京农学院基础科学系,102206

出　　处：《微计算机信息》2006年第12Z期246-247,166,共3页Control & Automation

基　　金：国家"十五"科技攻关项目(2001BA512B04)资助

摘　　要：近年来发光二极管越来越多的用作近红外光谱仪器的光源,发光二极管的稳定性直接影响光谱分析结果。本文介绍了一种用于提高LED光源稳定性的高精度数控恒流源电路,该电路基于单片机设计,由D/A转换电路和电流源电路组成,结构简单,输出从0￣165mA连续可调,恒流精度达到0.04%,光强稳定度优于±0.02%,结果满足光谱测量的要求。At present,LED are widely used as light sources in spectrum instruments, the results of spectral analysis depend on the stability of LED.This article proposes the design of a high precision digital constant-current source for improving the stability of LED. The design is based on the single-chip processor, consists of the D/A transform circuit and the current source, and has the characteristics of simple structure,adjustable output from 0-165mA,a current precision of 0.04% and the stability of LED as high as ± 0.02%. The results meet the demand of spectrum measurement.

关 键 词：发光二极管 稳定性 数控恒流源 

分 类 号：TN312.8[电子电信—物理电子学] TM131.3[电气工程—电工理论与新技术]