一种高精度闭环数控直流电流源的研制  

Research of Digitally Closed Controlled and High Precision DC Current Source

作　　者：柴西林[1] 史亚盼 杜丽霞[2] 

机构地区：[1]西北师范大学知行学院,甘肃兰州730070 [2]兰州交通大学电子与信息工程学院,甘肃兰州730070

出　　处：《实验室研究与探索》2015年第2期75-80,共6页Research and Exploration In Laboratory

摘　　要：基于直流电流源的原理,以AT89S52单片机为中心控制器,利用按键设置电流的输出值,通过单片机将该电流值送数码管显示;同时,通过D/A转换器DAC0808的数据通信端口将输出电流的数字量送入D/A转换器,转换为模拟量后输出,再通过U/I转换电路得到稳定输出的电流。经过实验测试,该数控电流源具有很高的精度值,可满足多种电流源的实验要求,且具有性能可靠、步进精度高、电路简单易懂、成本低廉等优点。A DC current source was designed by using AT89S52 microcontroller as the center controller. The current output value can be adjusted by touch-keys, single chip microcomputer sends the current value to digital tube display. At the same time, the data communication port of D/A converter DAC0808 sends the number of output current to D/A converter, which converts it to analog output, at last by U/I conversion circuit the stable output current can be achieved. After testing, this digitally controlled DC current source has high precision, can meet the requirement of a variety of current source experiments, and has reliable performance, high precision stepper. It is also simple, low cost, high practical value and development value, etc.

关 键 词：数控 电流源 AT89S52 DAC 步进 

分 类 号：TN86[电子电信—信息与通信工程]