PCI bus electric energy quality transient affair collection card and its collection method

Abstract

The invention provides a PCI bus power quality transient event acquisition card and an acquisition method thereof belonging to the power quality detection and analysis technique field. The acquisition card needs four acquisition channels when collecting a lattice point, a 12-bit resolution A / D converter and an FIFO memory are configured for each channel independently, the data acquisition rate ischanged depending on whether the power quality transient event occurs or not, if the transient event occurs, the rate is 20MSPS, and if not, the rate is 20kSPS, thereby effectively increasing the amount of information of data acquisition. The PCI bus data transmission adopts an FIFO cache 1k data block to inspect and transmit control strategies, only when the FIFO memory of the inspected acquisition channel is cached with 1k data, the acquired 1k data can be read from the channel and transmitted to the PCI bus, if the cached data are less than 1k or the transmission of the 1k data block is completed, the next acquisition channel is immediately checked to avoid a single channel from occupying the PCI bus exclusively and block the transmission of other channels, thereby further blocking data acquisition.

Description

technical field [0001] The invention belongs to the technical field of power quality detection and analysis, and relates to a PCI bus power quality transient event acquisition card and a collection method thereof, which are applied to record power quality transient events occurring in a network point voltage. Background technique [0002] The existing PCI bus data acquisition card composition principle is: the acquisition card is composed of input signal conditioning circuit, A / D converter, RAM or FIFO (first in first out) memory, PCI bus bridge chip and its A / D conversion, data storage and Transmission controller composition. When the acquisition card is working, according to the set acquisition rate, the analog signal is converted into data volume, first buffered in the memory, and then transmitted through the PCI bus. According to the PCI2.2 bus specification, under the 33MHz clock, the maximum data throughput of the PCI bus is 132M bytes / second. Considering that in the...

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Problems solved by technology

However, for a class of applications that collect power quality transient event signals, the non-fundamental components contained in the collected signal under normal conditions are located in the low frequency band, and only in the period when transient events occur will there be a large number of medium and high frequency components. Obviously, it is unreasonable for the PCI bus data acquisition card to collect such signals with a constant high sampling rate. overhead, while lower sampling rates will not capture complete transient event information

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