一种隔离型数据采集系统的设计与实现

Design and Implementation of Isolated Data Acquisition System

介绍了一种低噪声的隔离型数据采集系统的设计方法,该方法可使电路的信噪比大幅提高。系统采用FPGA为控制芯片,以LAN为接口实现FPGA和主机之间的数据通信。应用数字隔离技术,通过软、硬件的结合,实现了对模拟信号的数据采集功能,并介绍了该系统的结构和硬件关键电路模块,详述了数字隔离在数据采集系统中的作用和意义,分析了软件工作流程。结果表明,该系统实现了电力参数的采集和LAN通信,具有高精度、高可靠性和抗干扰能力强等优点。

A design of low noise isolated data acquisition system is introduced,this design can greatly improve the SNR of circuit.In this system,FPGA is used as control core,and LAN is used for interface to realize the fast data transmission between the FPGA and the PC.By combination of software and hardware,the function of analog signal data acqusition is achieved.In addition,the system structure and the design methods of the circuit are described,the role and significance of the digital isolation in the data acquisition system are elaborated,and the software working procedure is analyzed.The results show that the system is practical to acquire data and communicate by LAN,which has high precision,high reliabily and strong ariti-interference capability.