一种程控标准电流源设计

Design on Programmable Standard Current Source

设计一款应用于指针表的图像采集系统的程控标准电流源,从功能要求、硬件结构设计及电路设计等几个方面进行了论述。设计的程控标准电流源遵循与计算机匹配的串口通讯规约,可对计算机命令做出正确的执行和回答,可在程序控制下,输出标准电源,电源的精度要求比被检定仪表精度高,符合图像采集系统要求。

In this paper, from the aspects of the functional requirements, hardware structure design, circuit design and so on, the design of programmable standard current source for image acquisition system which is used in the indicator is described. The designed programmable standard current source, follow- ing serial communication protocols which match with the computer, can perform correct implementation and answer for the order from the computer. It can output standard power under control of the program. Because the accuracy requirement of the power supply is higher than the measure meter, it is in accord with the requirementof image acquisition system.