Wide voltage data collection device based on complex programmable logic device (CPLD)

Abstract

The invention discloses a wide voltage data collection device based on a complex programmable logic device (CPLD). Gear selected signals of a knob gear selection circuit are isolated by a photoelectric isolation circuit, then transmitted to a CPLD control unit, and then transmitted to a multi-path selector gear selection circuit through a digital isolator to control a channel. Analog voltage signals collected externally are attenuated through a matching resistance input circuit, transmitted to the channel selected by a multi-path selector through a clamping protection circuit, output to a calculation amplifier of an amplification buffer circuit, and transmitted to an analog/digital conversion circuit to achieve data conversion through the protection of the clamping protection circuit. Converted digital signals are transmitted to the CPLD control unit to perform data cache through a digital isolation circuit, and a final measurement result is output. The wide voltage data collection device based on the CPLD can collect data of simulation voltage signals from -600 V to +600V at high speed, and anti-jamming capacity of the whole device is greatly improved.

Description

technical field [0001] The invention relates to a high-speed isolated wide voltage data acquisition device. Background technique [0002] In the field of industrial production control, it is often necessary to collect as much data as possible, and realize high-speed, isolation and precise conversion of the collected data, especially in image processing systems that require high data collection range, speed and anti-interference performance , Measurement and control system. At present, the input voltage range of common data acquisition equipment on the market is basically tens of volts or even several volts, the anti-interference ability is not ideal, and most of them use single-chip microcomputer or digital signal processor (DSP: Digital Signal Processor) as the core chip , the acquisition rate of the system is low, and the anti-interference ability is relatively poor, so it is difficult to guarantee the stability and reliability of the system. With the advancement of elec...

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Problems solved by technology

[0003] In order to overcome the deficiencies of the existing technology, such as small measurable voltage range, low acquisition rate, and poor anti-interference ability, the present invention provides a wide voltage data acquisition device based on CPLD, which can perform high-speed monitoring of analog voltage signals from -600V to +600V. data collection

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