本文主要论述了一种基于51单片机为核心控制器的数控直流电源的设计原理和实现方法。该电源具有电压可预置、可步进调整、输出的电压信号和预置的电流信号可同时显示功能。-The method of this paper based on the 51 microcontroller core of the numerical controller DC power supply design theory and realization. The power supply has some functions such as presetting voltage, stepping adjustment, displaying the output voltage signals and the presetting current signals at the same time.