介绍了一种数控直流电流源的硬件电路和工作原理以及软件设计。该电流源通过输出电流反馈构成了闭环控制系统。其输出电流精度高、稳定性好,具有良好的负载特性。 关键词:单片机电流源 闭环控制 Abstract: This paper describes the hardware circuit and the operating principle of a digital direct current source, as well as its software designing. The current source constitutes a close-loop control system through output current feedback. Its output current not only is high stability and precision, but also has good load characteristic. Key words: single chip microcomputer current source close-loop control