| 一种可驱动多路发光二级管的精密镜象恒流源 |
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| 引用本文： | 曹彦波,王兴华,张寒琦,于爱民. 一种可驱动多路发光二级管的精密镜象恒流源[J]. 分析仪器, 2009, 0(1): 7-10 |
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| 作者姓名： | 曹彦波 王兴华 张寒琦 于爱民 |
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| 作者单位： | 吉林大学化学学院分析化学系,长春,130012 |
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| 摘 要： | 在对普通恒流源加以变形的基础上，设计了一种可以驱动多路发光二级管的镜象电流源。利用D／A转换器和精密运放实现V／I转换及恒流连续可调。采用晶体管扩流，ULN2003进行多路电流切换。测试表明，V／I转换电路的输入电压和镜象输出电流之间具有良好的线性关系，恒流精度达0．05％。
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| 关 键 词： | 恒流源 发光二级管 镜象电路 |
A precision mirror constant current source for driving multi-channel LED. |
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| Cao Yanbo,Wang Xinghua,Zhang Hanqi,Yu Aimin. A precision mirror constant current source for driving multi-channel LED.[J]. Analytical Instrumentation, 2009, 0(1): 7-10 |
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| Authors: | Cao Yanbo Wang Xinghua Zhang Hanqi Yu Aimin |
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| Affiliation: | Department of Analytical Chemistry;College of Chemistry;Jilin University;Jilin;130012 |
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| Abstract: | Based on the transformation of common constant current source,a novel circuit of mirror constant current source was designed for driving multi-channel LED.The VII conversion and continuous tune of constant current were realized with D/A converter and high precision operational amplifier.The transister was used for current amplification and ULN2003 was used for multi-channel current switch.The results showed that there was a good linear relationship between the input voltage of VII converter and the output c... |
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