基于PCI总线的高精度数据采集系统

A HIGH-ACCURACY DATAACQUISITION SYSTEM BASED ON PCI BUS

对电力系统的模拟信号进行高速、高精度和实时传输是微机保护的一项重要任务。作者介绍了一种基于 PCI总线的高精度数据采集系统的设计方法,包括数据采集和PCI 总线接口两部分的设计。数据采集板的核心 A/D 转换器采用 16 位高精度转换芯片 AD976,而 PCI 总线接口器件采用的是 S5933 专用接口芯片。此外还讨论了基于本采集系统的驱动程序和应用程序的一般设计方法。

It is very important task for microcomputer based protective device to transmission analogue signal of power system in high speed, high accuracy and real-time mode. Here a design method for high accuracy data acquisition based on PCI bus is presented, including the data acquisition and the design of the interface for PCI bus. A 16-bit high accuracy analog-digital chip AD976 is used as the kernel of data acquisition board and the special purpose interface chip S5933 is used in PCI interface unit. Otherwise, the general design method for device driver and application program of the presented data acquisition system is described.