基于单片机的高精度数控电流源的设计

Design of High-accuracy Numerical Controlled Current Source Based on Single-chip

整个电源系统由STC89C51核心控制器、恒流源、D/A转换电路、A/D转换(数据采集)电路、键盘、显示器、主电源及辅助电源等7大模块组成。用键盘接收用户输入的控制信息,经单片机分析用户命令,再发出各种控制信息,完成各种控制功能。为了实时测量负载输出电流变化的情况,采用A/D转换数据采集模块,由单片机接收采集到的数据并进行处理后输出到LED数码管,完成负载输出电流的显示。

The whole current source system consists of STC89C51 core controller, constant - current source,D/A converter, A/D converter （da- ta acquisition）, keyboard, display, main current source,accessory power supply and so on. Using keyboard to receive controlling information by user inputed, single - chip analyzes user command, then sends all kinds of controlling information, accom- plishes control function. To measure the output current of the load instantaneously, using A/D con- verter to achieve the data acquisition, the single - chip receive the data, processes the data, and out- lets to the LED to display, achieves the display of the load current.