High-speed digital acquisition device capable of acquiring wide voltage range

Abstract

The invention relates to the technical field of digital acquisition, and particularly discloses a high-speed digital acquisition device capable of acquiring wide voltage range. According to the high-speed digital acquisition device disclosed by the invention, a CPLD (Complex Programmable Logic Device) 8 is used for controlling a high-speed AD (Analog-Digital) converter to realize data acquisition of a dual-channel analog voltage (-600V to +600V), and meanwhile, acquired data is stored in a digital storage unit 9 for waiting an LVDS (Low Voltage Differential Signaling) bus instruction so as to transmit the stored data to an LVDS bus. According to the high-speed digital acquisition device, attenuation and conditioning of wide range voltage are realized by adopting a voltage attenuation circuit and a voltage conditioning circuit based on an analogy selector switch and an operational amplifier, so that the signal acquisition precision is greatly improved. The high-speed digital acquisition device carries out effective isolation on external analog quantity by adopting a photoelectric isolator, so as to realize electrostatic protection on the CPLD. The high-speed digital acquisition device disclosed by the invention has the function of carrying out effective isolated protection on acquired channel data by adopting a high-speed data isolator, so that the anti-jamming capability of the CPLD on a front-end acquisition circuit and the anti-jamming capability among acquisition channels are improved.

Description

technical field [0001] The invention relates to the technical field of digital acquisition, in particular to a digital acquisition device capable of acquiring a wide voltage range at high speed. Background technique [0002] With the wide application of computers and the high development of microelectronics, digital systems have been widely used in various fields of national economy, national defense construction and scientific experiments. Compared with the analog system, the digital system has a series of advantages such as high precision and good stability. Various detected quantities in the external world, such as temperature, pressure, displacement, flow rate, angle and position, etc., are converted into physical quantities for further processing (usually signals such as voltage or current) through corresponding sensors of various types. Digital systems convert these Analog signals are converted to digital signals for easy storage and processing. [0003] Data acquisi...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-speed digital collector capable of collecting a wide voltage range, which overcomes the shortcomings of the prior art, such as low sampling speed and precision, narrow sampling range, poor reliability and scalability, etc., and realizes dual Channel, wide voltage range (-600V ~ +600V) high-speed data acquisition, storage and transmission, and take a variety of measures to improve the scalability, anti-interference ability and reliability of the system

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