摘要
介绍利用单片机系统、D／A与A／D转换器和恒流源电路实现输出范围为20～2000mA的数控直流电流源的设计，文中给出了数控直流电流源设计框图和主要电路。采用负反馈闭环控制系统，提高了电流源的输出精度。经测试表明，所设计的电流源具有性能可靠、精度高的优点。
The design and application of digital controlled DC current source with an output range between 20mA to 2000mA are introduced. The system is composed of the single-chip microcomputer, D/A converter, A/D converter and constant current source electric circuit, etc. In this paper, the frame drawing and main circuit are given. This design adopts negative feedback closed loop control in order to improve the output precision. Testing results show that this DC current source has reliable performance and high precision.
出处
《仪表技术》
2008年第6期58-60,共3页
Instrumentation Technology
关键词
单片机系统
D/A转换器
恒流源
数控电流源
single-chip microcomputer system
D/A converter
constant current source
digital controlled DCcurrent source
