4-20ma special analogue acquisition module

A technology of acquisition module and analog quantity, which is applied in the direction of using electric/magnetic devices to transmit sensing components, etc., can solve the problems of equipment electrical performance and the impact of human living environment, etc., to meet the requirements of data acquisition, good stability, and overcome data effect of error

Inactive Publication Date: 2012-06-20
CHINA XD ELECTRIC CO LTD
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Problems solved by technology

[0004] Although SF 6 Gas has great advantages as electrical insulation and arc extinguishing medium, but SF 6 The change of gas state has a great influence on the electrical performance of equipment and the living environment of people

Method used

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  • 4-20ma special analogue acquisition module
  • 4-20ma special analogue acquisition module
  • 4-20ma special analogue acquisition module

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Embodiment Construction

[0019] Below in conjunction with accompanying drawing, the 4-20mA special-purpose analog acquisition module of the present invention is described in detail:

[0020] The invention provides a 4-20mA dedicated analog acquisition module, which is mainly composed of five parts including an I / V conversion unit, a V / F conversion unit, an optocoupler isolation unit, a CPLD core control unit, and a power supply unit. The 4-20mA dedicated analog acquisition module converts the 4-20mA analog quantity collected by the sensor into a 10KHz-50KHz frequency signal realized by CPLD programmable acquisition, sends it out through the CPLD programmable chip, and hands it over to other processing modules. Among them, 10KHz corresponds to 4mA, 50KHz corresponds to 20mA, and there is a linear relationship between current and frequency F OUT =2500I IN (where F OUT is the frequency signal output by the V / F module, I IN It is the input 4-20mA analog current of this dedicated acquisition module).

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Abstract

The invention provides a 4-20mA special analogue acquisition module, which comprises an I/V conversion unit, a V/F conversion unit, an opto-coupler isolation unit, a CPLD (Complex Programmable Logic Device) core control unit and multiple paths of power supply units, wherein 4-20mA analogue quantity is converted into a 1-5V voltage signal through the I/V conversion unit firstly; the voltage signal is converted into a 10K-50KHz frequency signal through the V/F conversion unit; the frequency signal is isolated from the CPLD core control unit through the opto-coupler isolation unit; the CPLD core control unit is used for counting, collecting and operating the collected frequency pulse, and is connected with a background device through an I/O port of the CPLD core control unit finally; the information collected by the CPLD is uploaded; the multiple paths of power supply units supply the electricity to the analogue acquisition module; a +5V power source is converted into a +3.3V and a +/-12V power sources to supply power to the module.

Description

technical field [0001] The invention belongs to the field of data acquisition of electric power equipment and industrial equipment thereof, and relates to a 4-20mA special-purpose analog acquisition module, which is especially used in the state detection of high-voltage GIS SF6 gas, and carries out each 4-20mA analog quantity transmitted by the sensor of high-voltage GIS. Collect, output, and judge the status of high-pressure GIS SF6 gas. Background technique [0002] With the development of power system technology, modern digital substation technology has been applied to all aspects of power grid transmission and distribution. Modern digital substation technology uses a new type of GIS (gas isolating switch) to replace the previous AIS (air isolating switch), so SF 6 The application of insulating gas is inevitable and will play a major role. [0003] SF 6 It has excellent electrical insulation and arc extinguishing performance, and its characteristic is that it is used as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/244
Inventor 张杭卢鑫严结实古海生
Owner CHINA XD ELECTRIC CO LTD
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