精密直流恒流源开发

作者：黄忠慧，张耀，陈基伟 日期：2006-12-28/span> 浏览：4216 查看PDF文档

精密直流恒流源开发

黄忠慧，张耀，陈基伟
（浙江机电职业技术学院，浙江 杭州 310053）

摘要：开发了一种基于电流闭环反馈控制的数控直流恒流源，介绍了该电路的设计思路。提出由D/A转换器输出为粗调，数字电位器输出为微调的组合D/A输出信号的新方法。将该D/A组合输出信号做为电流环给定值，最小给定值可达0.01 mA。实验结果表明，该电路简单，调整方便，控制精度高，稳定性能好，纹波系数小，具有广泛的应用前景。
关键词：闭环反馈;恒流源;PI调节;数字电位器
中图分类号：TN86文献标识码：A文章编号：1001-4551(2006)05-0059-04

Development of Precise DC Constant Current Power Supply
HUANG Zhong|huei, ZHANG Yao, CHEN Ji|wei
(Zhejiang Institute of Mechanical & Electrical Engineering, Hangzhou 310053, China)
Abstract: A DC constant current power supply circuit based on current closed|loop feedback control is brought forward in this paper and how to design the circuit is also emphatically introduced. A new method that combined  D/A output is made up of two parts: D/A converter output for primary adjustment ,numerical resistance output for trimmer  is introduced  in the designing. The output is  the input of current closed|loop feedback control circuit .It’s minimum  is 0.01mA.The results of experiments show that the circuit is simple, convenient to be adjusted and has high accuracy of control ,good stability ,low  ripple quotined and prosperous future of application.
Key words: closed|loop feedback; constant current power supply; PI adjustment; numerical resistance
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