CN205720625U - Imput output circuit for intelligent process check meter - Google Patents
Imput output circuit for intelligent process check meter Download PDFInfo
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- CN205720625U CN205720625U CN201620514342.XU CN201620514342U CN205720625U CN 205720625 U CN205720625 U CN 205720625U CN 201620514342 U CN201620514342 U CN 201620514342U CN 205720625 U CN205720625 U CN 205720625U
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Abstract
The utility model proposes a kind of imput output circuit for intelligent process check meter, including: thermocouple voltages input block signal control end connects analog switch control circuit second switch end, electric current back production circuit signal control end connects analog switch control circuit the 3rd switch terminals or the 6th switch terminals, thermocouple voltages output unit signal control end connects D/A converting circuit signal end, analog to digital conversion circuit signal output part connects analog switch control circuit the 7th switch terminals, analog switch control circuit the 5th switch terminals connection mode number conversion circuit signal end, analog to digital conversion circuit control signal end connects MCU controller control signal end.This input-output unit has possessed to tested instrument, for example isolator, guard grating, the detection of the industry secondary meters such as temperature transmitter and the inspection of running parameter, complete function, and detection data are accurate, are widely used.
Description
Technical field
The utility model relates to electronic circuit field, particularly relates to a kind of input and output electricity for intelligent process check meter
Road.
Background technology
The performance parameters to industry secondary meter of prior art is all by separate detection, and not effective detection is for example
The properties of product of isolator, guard grating and temperature transmitter, or the data that detector of the prior art is detected are not
Accurately, causing yields in production process to decline, in detector, the imput output circuit of its core serves most important
Effect, its function of imput output circuit of the prior art is deficient and gathers and the inaccurate problem of nominal data, and this is just
Need those skilled in the art badly and solve corresponding technical problem.
Utility model content
The utility model is intended at least solve technical problem present in prior art, especially innovatively proposes a kind of use
Imput output circuit in intelligent process check meter.
In order to realize above-mentioned purpose of the present utility model, the utility model provides a kind of for intelligent process check meter
Imput output circuit, comprising: analog switch control circuit, analog to digital conversion circuit, thermocouple voltages output unit, thermocouple voltages
Input block, electric current back production circuit, isolation power distribution circuit, thermal resistance output circuit and D/A converting circuit；
Thermocouple voltages input block signal control end connects analog switch control circuit second switch end, electric current back production electricity
Road signal control end connects analog switch control circuit the 3rd switch terminals or the 6th switch terminals, and thermocouple voltages output unit is believed
Number control end connect D/A converting circuit signal end, analog to digital conversion circuit signal output part connect analog switch control circuit the 7th
Switch terminals, analog switch control circuit the 5th switch terminals connection mode number conversion circuit signal end, analog to digital conversion circuit control signal
End connects MCU controller control signal end.
The having the beneficial effect that to be connected by the circuit of input-output unit of technique scheme achieves tested instrumented data
Collection and transmission.
The described imput output circuit for intelligent process check meter, it is preferred that described thermocouple voltages input block
Including: thermocouple voltage input interface one end connects tested instrument, and the thermocouple voltage input interface other end connects the 11st resistance respectively
One end and the 12nd resistance one end, the 12nd resistance other end connects the 13rd resistance one end and control resistance switch, the 11st resistance respectively
The other end connects the 20th electric capacity one end and the 7th diode cathode respectively, and the 20th electric capacity other end ground connection, the 7th diode cathode connects
Ground, the 7th diode cathode be also connected with control resistance switch input terminal, the 13rd resistance other end connect respectively the 14th resistance one end and
Control resistance switch input terminal, the 14th resistance other end ground connection, control resistance output switching terminal connection the 10th resistance one end, the 10th
The resistance other end connects the 19th electric capacity one end and the 2nd operational amplifier electrode input end respectively, and the 19th electric capacity other end is grounded, the
2 operational amplifier output terminals connect the 2nd operational amplifier negative input and analog switch control circuit second switch end respectively,
2nd operational amplifier output terminal is also connected with the 18th electric capacity one end, the 18th electric capacity other end ground connection.
Technique scheme have the beneficial effect that the input operation by thermocouple voltages input block, it is ensured that thermocouple
Voltage inputs accurate stable.
The described imput output circuit for intelligent process check meter, it is preferred that described electric current back production circuit includes:
Electric current back production input interface one end connects tested instrument, and the electric current back production input interface other end connects the 18th respectively
Resistance one end and the 8th diode cathode, the 8th diode cathode ground connection, the 18th resistance one end is also connected with the 3rd FET drain electrode,
3rd FET source electrode connects the 18th resistance other end and the 4th operational amplifier negative input respectively, the 4th operational amplifier
Output connects the 3rd fet gate, and the 4th operational amplifier electrode input end connects the 16th resistance one end and the 17th electricity respectively
Resistance one end, the 16th resistance other end ground connection, the 17th resistance other end connects power end, and the 3rd FET source electrode is also connected with the 15th
Resistance one end, the 15th resistance other end ground connection, the 15th resistance one end is also connected with the 3rd operational amplifier electrode input end, the 3rd computing
Amplifier negative input connects the 21st electric capacity one end and the 3rd operational amplifier output terminal respectively, and the 21st electric capacity other end is grounded,
21st electric capacity one end is also connected with analog switch control circuit the 3rd switch terminals.
Technique scheme have the beneficial effect that the work by electric current back production circuit, it is ensured that tested instrument electric current back production
Data are accurate.
The described imput output circuit for intelligent process check meter, it is preferred that described isolation power distribution circuit includes:
Accept distribution anode interface and connect the 4th FET drain electrode, accept distribution negative pole interface and connect the 21st resistance respectively
One end and ground connection, the 21st resistance other end connects the 23rd electric capacity one end and the 4th FET source electrode respectively, the 4th FET grid
Pole connects the 5th operational amplifier output terminal, and the 23rd electric capacity one end is also connected with the 5th operational amplifier negative input, and the 5th computing is put
Big device electrode input end connects the 22nd electric capacity one end, and the 22nd electric capacity other end ground connection, the 22nd electric capacity one end is also respectively connected with the 19th
Resistance one end and the 20th resistance one end, the 20th resistance other end ground connection, the 19th resistance other end connects the 11st operation amplifier respectively
Device output and the 62nd electric capacity one end, the 62nd electric capacity other end ground connection.
The circuit safety having the beneficial effect that by isolating power distribution circuit protection input-output unit of technique scheme.
The described imput output circuit for intelligent process check meter, it is preferred that described thermocouple voltages output unit
Including:
Thermocouple voltage output interface connects the 26th electric capacity one end and the 28th resistance one end respectively, another termination of the 26th electric capacity
Ground, the 28th resistance other end connects the 8th operational amplifier output terminal, and the 8th operational amplifier negative input connects the 10th respectively
Diode cathode and the 26th electric capacity one end, the 10th diode cathode ground connection, the 8th operational amplifier electrode input end connects the 25th electricity
Holding one end, the 25th electric capacity other end ground connection, the 25th electric capacity one end is also respectively connected with the 26th resistance one end and the 27th resistance one end, the
The 26 resistance other ends connect the 11st operational amplifier output terminal, the 27th resistance other end ground connection.
Technique scheme have the beneficial effect that the output function by thermocouple voltages output unit, it is ensured that thermocouple
Voltage exports accurate stable.
The described imput output circuit for intelligent process check meter, it is preferred that described thermal resistance output circuit includes: heat
Resistance output signal interface one end connects tested instrument, and thermal resistance output signal interface low-pressure end connects the 28th electric capacity one end, and thermal resistance is defeated
Go out signaling interface high-pressure side and connect the 29th electric capacity one end, the 28th electric capacity other end ground connection, the 29th electric capacity other end ground connection, the 28th electricity
Hold one end and be also respectively connected with the 35th resistance one end and the 9th operational amplifier negative input, the 9th operational amplifier electrode input end
Connection the 31st resistance one end and the 65th resistance one end respectively, the 35th resistance other end connection the 9th operational amplifier output terminal, the 31st
The resistance other end connects the 27th electric capacity one end and the 30th electric capacity one end respectively, the 65th resistance other end ground connection, the 27th electric capacity another
End ground connection, the 30th resistance other end connects the second digital to analog converter (TLV5616) output, the first digital to analog converter
(TLV5616) and the second digital to analog converter is in parallel, and the 31st resistance other end is also connected with the 29th resistance one end, the 29th resistance other end
Connecting the first digital to analog converter output, the 29th electric capacity one end is also connected with the 36th resistance one end, and the 36th resistance other end connects respectively
Connecing the 11st diode cathode and the 37th resistance one end, the 37th resistance other end ground connection, the 37th resistance other end is also connected with the 11st 2
Pole pipe positive pole, the 11st diode cathode is also connected with the 34th resistance one end, and the 34th resistance other end is just connecting the 10th operational amplifier
Pole input, the 10th operational amplifier negative input connects the 33rd resistance one end and the 32nd resistance one end respectively, the 33rd resistance
The other end is grounded, and the 32nd resistance other end connects the 10th operational amplifier output terminal, and the 10th operational amplifier output terminal is also distinguished
Connect the reference voltage input terminal of the first digital to analog converter (TLV5616) and the second digital to analog converter.
Technique scheme have the beneficial effect that the acquisition work being realized thermal resistance resistance by thermal resistance output circuit, pass through
Two digital to analog converters achieve the calculating of resistance.
The described imput output circuit for intelligent process check meter, it is preferred that described D/A converting circuit includes: number
Mould conversion chip clock signal terminal connects MCU controller signals output, and analog-digital chip signal output part connects the 39th electricity
Resistance one end, the 39th resistance other end connects the 38th resistance one end and the 30th electric capacity one end respectively, the 30th electric capacity other end ground connection, the
The 39 resistance other ends connect the 11st operational amplifier electrode input end, and the 11st operational amplifier negative input connects the 11st computing
Amplifier out and the 62nd electric capacity one end, the 62nd electric capacity other end ground connection, the 11st operational amplifier output terminal is also connected with simulation
ON-OFF control circuit the 7th switch terminals.
The described imput output circuit for intelligent process check meter, it is preferred that described analog switch control circuit bag
Include: modulus conversion chip reference voltage end connects the 38th electric capacity one end and the 39th electric capacity one end, the 38th electric capacity other end and the 39th
The electric capacity other end connects, and modulus conversion chip signal input part connects MCU controller control signal end, modulus conversion chip positive pole
End connects the 52nd resistance one end and the 37th electric capacity one end respectively, and the 37th electric capacity other end ground connection, the 52nd resistance other end connects respectively
Connecing the 63rd electric capacity one end and the 51st resistance one end, the 51st resistance other end connects the 50th resistance one end and the 49th resistance one respectively
End, the 50th resistance other end ground connection, the 49th resistance other end connects the 12nd operational amplifier negative input, the 12nd operation amplifier
Device offset side connects the 35th electric capacity one end, and the 35th electric capacity other end ground connection, the 12nd operational amplifier output terminal connects the 36th respectively
Electric capacity one end and the 63rd electric capacity one end, the 36th electric capacity other end ground connection, the 63rd electric capacity other end connection the 49th resistance one end, the 12nd
Operational amplifier electrode input end connects the 48th resistance one end, and the 48th resistance other end connects the 47th resistance one end and the 34th respectively
Electric capacity one end, the 47th resistance other end connects No. 0 switch terminals of analog switch control circuit, and the 5th switch terminals connects the 41st respectively
Resistance one end and the 32nd electric capacity one end, the 41st resistance other end ground connection, the 32nd electric capacity other end connects the 3rd output end of voltage stabilizer,
3rd voltage-stablizer input connects the 31st electric capacity one end and the 40th resistance one end respectively, and the 31st electric capacity other end connects the 40th resistance
The other end, the 7th switch terminals connects the 43rd resistance one end and the 42nd resistance one end respectively, the 42nd resistance other end ground connection, the 43rd electricity
The resistance other end connects the 11st operational amplifier output terminal, and the 4th switch terminals connects the 6th operational amplifier output terminal, the 3rd switch terminals
Connecting the 3rd operational amplifier output terminal, second switch end connects the 33rd electric capacity one end and the 44th resistance one end, the 33rd electric capacity respectively
The other end is grounded, and the 44th resistance other end connects the 2nd operational amplifier output terminal, and the first switch terminals connects the 46th resistance one respectively
End and the 53rd resistance one end, the 53rd resistance other end connects the 12nd diode cathode and ground connection respectively, and the 46th resistance other end divides
Lian Jie the 45th resistance one end and 24V power supply side.
Having the beneficial effect that of technique scheme can effectively carry out detection control by this analog switch control circuit
System, makes procedure inspection instrument preferably play detection effect.
In sum, owing to have employed technique scheme, the beneficial effects of the utility model are:
This imput output circuit is capable of the detection of thermocouple voltage input and output, and the function of electric current back production, and
Can accurately calculate thermal resistance resistance, accurately be sent detection instruction by analog switch control circuit, circuit design is reasonable, low cost
Honest and clean, help user to achieve the demarcation to industry secondary meter and detection.
Additional aspect of the present utility model and advantage will part be given in the following description, and part will be from explained below
In become obvious, or recognized by practice of the present utility model.
Brief description
Above-mentioned and/or additional aspect of the present utility model and advantage are from combine will the description to embodiment for the accompanying drawings below
Become obvious and easy to understand, wherein:
Fig. 1 is the utility model input-output unit schematic diagram；
Fig. 2 is the utility model thermocouple voltages input-cell circuitry figure；
Fig. 3 is the utility model the first electric current back production circuit diagram；
Fig. 4 is the utility model isolation power distribution circuit figure；
Fig. 5 is the utility model the second electric current back production circuit diagram；
Fig. 6 is the utility model thermocouple voltages output unit circuit diagram；
Fig. 7 is the utility model thermal resistance output circuit figure；
Fig. 8 is the utility model D/A converting circuit figure；
Fig. 9 is the utility model analog switch control circuit figure.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of described embodiment is shown in the drawings, wherein ad initio
To the element that same or similar label represents same or similar element or has same or like function eventually.Below by ginseng
It is exemplary for examining the embodiment that accompanying drawing describes, and is only used for explaining the utility model, and it is not intended that to of the present utility model
Limit.
Of the present utility model describe in, it is to be understood that term " longitudinally ", " laterally ", " on ", D score, " front ",
The orientation of the instruction such as " afterwards ", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relationship are for based on attached
Orientation shown in figure or position relationship, be for only for ease of description the utility model and simplification describes, rather than instruction or hint
The device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this
The restriction of utility model.
Of the present utility model describe in, unless otherwise prescribed and limit, it should be noted that term " is installed ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be mechanically connected or electrical connection, it is also possible to be the company of two element internals
Logical, can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
As it is shown in figure 1, the described imput output circuit for intelligent process check meter, it is preferred that described input and output
Unit includes: analog switch control circuit, analog to digital conversion circuit, thermocouple voltages output unit, thermocouple voltages input block,
Electric current back production circuit, isolation power distribution circuit, thermal resistance output circuit and D/A converting circuit；
Thermocouple voltages input block signal control end connects analog switch control circuit second switch end, electric current back production electricity
Road signal control end connects analog switch control circuit the 3rd switch terminals or the 6th switch terminals, and thermocouple voltages output unit is believed
Number control end connect D/A converting circuit signal end, analog to digital conversion circuit signal output part connect analog switch control circuit the 7th
Switch terminals, analog switch control circuit the 5th switch terminals connection mode number conversion circuit signal end, analog to digital conversion circuit control signal
End connects MCU controller control signal end.
Technique scheme have the beneficial effect that this input-output unit has possessed to tested instrument, such as isolator, peace
Full grid, the detection of the industry secondary meters such as temperature transmitter and the inspection of running parameter, complete function, detection data are accurate, should
With extensively.
As in figure 2 it is shown, the described imput output circuit for intelligent process check meter, it is preferred that described thermocouple electricity
Pressure input block includes: thermocouple voltage input interface one end connects tested instrument, and the thermocouple voltage input interface other end connects respectively
Connecing the 11st resistance one end and the 12nd resistance one end, the 12nd resistance other end connects the 13rd resistance one end respectively and control resistance is opened
Closing, the 11st resistance other end connects the 20th electric capacity one end and the 7th diode cathode respectively, the 20th electric capacity other end ground connection, and the 7th two
Pole pipe plus earth, the 7th diode cathode is also connected with controlling resistance switch input terminal, and the 13rd resistance other end connects the 14th respectively
Resistance one end and control resistance switch input terminal, the 14th resistance other end ground connection, control resistance output switching terminal connects the 10th electricity
Resistance one end, the 10th resistance other end connects the 19th electric capacity one end and the 2nd operational amplifier electrode input end respectively, and the 19th electric capacity is another
One end is grounded, and the 2nd operational amplifier output terminal connects the 2nd operational amplifier negative input and analog switch control electricity respectively
Road second switch end, the 2nd operational amplifier output terminal is also connected with the 18th electric capacity one end, the 18th electric capacity other end ground connection.
Such as Fig. 1, shown in the 3rd, 5, the described imput output circuit for intelligent process check meter, it is preferred that described electric current
Back production circuit includes the first electric current back production circuit and the second electric current back production circuit, and this circuit employing one enters two and goes out mentality of designing to quilt
Survey instrument and carry out electric current back production detection:
Shown first electric current back production circuit includes:
Electric current back production input interface one end connects tested instrument, and the electric current back production input interface other end connects the 18th electricity respectively
Resistance one end and the 8th diode cathode, the 8th diode cathode ground connection, the 18th resistance one end is also connected with the 3rd FET and drains, and the 3rd
FET source electrode connects the 18th resistance other end and the 4th operational amplifier negative input, the 4th operational amplifier output respectively
End connects the 3rd fet gate, and the 4th operational amplifier electrode input end connects the 16th resistance one end and the 17th resistance one respectively
End, the 16th resistance other end ground connection, the 17th resistance other end connects power end, and the 3rd FET source electrode is also connected with the 15th resistance
One end, the 15th resistance other end ground connection, the 15th resistance one end is also connected with the 3rd operational amplifier electrode input end, the 3rd operation amplifier
Device negative input connects the 21st electric capacity one end and the 3rd operational amplifier output terminal respectively, and the 21st electric capacity other end is grounded, and the 21st
Electric capacity one end is also connected with analog switch control circuit the 3rd switch terminals.
Described second electric current back production circuit includes:
Electric current back production input interface one end connects tested instrument, and the electric current back production input interface other end connects the 25th electricity respectively
Resistance one end and the 9th diode cathode, the 9th diode cathode ground connection, the 25th resistance one end is also connected with the 5th FET and drains, and the 5th
FET source electrode connects the 25th resistance other end and the 7th operational amplifier negative input, the 7th operational amplifier output respectively
End connects the 5th fet gate, and the 7th operational amplifier electrode input end connects the 23rd resistance one end and the 24th resistance one respectively
End, the 23rd resistance other end ground connection, the 24th resistance other end connects power end, and the 5th FET source electrode is also connected with the 22nd resistance
One end, the 22nd resistance other end ground connection, the 22nd resistance one end is also connected with the 6th operational amplifier electrode input end, the 6th operation amplifier
Device negative input connects the 24th electric capacity one end and the 6th operational amplifier output terminal respectively, and the 24th electric capacity other end is grounded, and the 24th
Electric capacity one end is also connected with analog switch control circuit the 4th switch terminals.
As shown in Figure 4, the described imput output circuit for intelligent process check meter, it is preferred that described isolation distribution
Circuit includes:
Accept distribution anode interface and connect the 4th FET drain electrode, accept distribution negative pole interface and connect the 21st resistance respectively
One end and ground connection, the 21st resistance other end connects the 23rd electric capacity one end and the 4th FET source electrode respectively, the 4th FET grid
Pole connects the 5th operational amplifier output terminal, and the 23rd electric capacity one end is also connected with the 5th operational amplifier negative input, and the 5th computing is put
Big device electrode input end connects the 22nd electric capacity one end, and the 22nd electric capacity other end ground connection, the 22nd electric capacity one end is also respectively connected with the 19th
Resistance one end and the 20th resistance one end, the 20th resistance other end ground connection, the 19th resistance other end connects the 11st operation amplifier respectively
Device output and the 62nd electric capacity one end, the 62nd electric capacity other end ground connection.
As shown in Figure 6, the described imput output circuit for intelligent process check meter, it is preferred that described thermocouple electricity
Pressure output unit includes:
Thermocouple voltage output interface connects the 26th electric capacity one end and the 28th resistance one end respectively, another termination of the 26th electric capacity
Ground, the 28th resistance other end connects the 8th operational amplifier output terminal, and the 8th operational amplifier negative input connects the 10th respectively
Diode cathode and the 26th electric capacity one end, the 10th diode cathode ground connection, the 8th operational amplifier electrode input end connects the 25th electricity
Holding one end, the 25th electric capacity other end ground connection, the 25th electric capacity one end is also respectively connected with the 26th resistance one end and the 27th resistance one end, the
The 26 resistance other ends connect the 11st operational amplifier output terminal, the 27th resistance other end ground connection.
As it is shown in fig. 7, described thermal resistance output circuit includes: thermal resistance output signal interface one end connects tested instrument, thermal resistance
Output signal interface low-pressure end connects the 28th electric capacity one end, and thermal resistance output signal interface high-pressure side connects the 29th electric capacity one end, the
28 electric capacity other end ground connection, the 29th electric capacity other end ground connection, the 28th electric capacity one end is also respectively connected with the 35th resistance one end and the 9th fortune
Calculating amplifier negative input, the 9th operational amplifier electrode input end connects the 31st resistance one end and the 65th resistance one end respectively,
The 35th resistance other end connects the 9th operational amplifier output terminal, and the 31st resistance other end connects the 27th electric capacity one end and the respectively
30 electric capacity one end, the 65th resistance other end ground connection, the 27th electric capacity other end ground connection, the 30th resistance other end connects the second digital-to-analogue and turns
Parallel operation (TLV5616) output, the first digital to analog converter (TLV5616) and the second digital to analog converter are in parallel, the 31st resistance another
End is also connected with the 29th resistance one end, and the 29th resistance other end connects the first digital to analog converter output, and the 29th electric capacity one end also connects
Connecing the 36th resistance one end, the 36th resistance other end connects the 11st diode cathode and the 37th resistance one end respectively, and the 37th resistance is another
One end is grounded, and the 37th resistance other end is also connected with the 11st diode cathode, and the 11st diode cathode is also connected with the 34th resistance one end,
The 34th resistance other end connects the 10th operational amplifier electrode input end, and the 10th operational amplifier negative input connects the respectively
33 resistance one end and the 32nd resistance one end, the 33rd resistance other end ground connection, the 32nd resistance other end connects the 10th operational amplifier
Output, the 10th operational amplifier output terminal is also respectively connected with the first digital to analog converter (TLV5616) and the second digital to analog converter
Reference voltage input terminal.This thermal resistance output circuit, by obtaining high pressure and low pressure numerical value, enters line parameter in analog-digital converter
After conversion, being worth to thermal resistance resistance by the ratio of voltage and current, this circuit design is reasonable, and data transmission is accurately.
As shown in Figure 8, described D/A converting circuit includes: analog-digital chip clock signal terminal connects MCU controller letter
Number output, analog-digital chip signal output part connects the 39th resistance one end, and the 39th resistance other end connects the 38th electricity respectively
Resistance one end and the 30th electric capacity one end, the 30th electric capacity other end ground connection, the 39th resistance other end connects the 11st operational amplifier positive pole
Input, the 11st operational amplifier negative input connects the 11st operational amplifier output terminal and the 62nd electric capacity one end, the 62nd electricity
Holding other end ground connection, the 11st operational amplifier output terminal is also connected with analog switch control circuit the 7th switch terminals.By this digital-to-analogue
Change-over circuit is transferred to input-output unit carries out signal control by remotely detecting control signal.
As it is shown in figure 9, described analog switch control circuit includes: modulus conversion chip reference voltage end connects the 38th electric capacity
One end and the 39th electric capacity one end, the 38th electric capacity other end and the 39th electric capacity other end connect, modulus conversion chip signal input part
Connecting MCU controller control signal end, modulus conversion chip positive terminal connects the 52nd resistance one end and the 37th electric capacity one end respectively,
37th electric capacity other end ground connection, the 52nd resistance other end connects the 63rd electric capacity one end and the 51st resistance one end respectively, the 51st resistance
The other end connects the 50th resistance one end and the 49th resistance one end respectively, and the 50th resistance other end ground connection, the 49th resistance other end is even
Connecing the 12nd operational amplifier negative input, the 12nd operational amplifier offset side connects the 35th electric capacity one end, the 35th electric capacity another
End ground connection, the 12nd operational amplifier output terminal connects the 36th electric capacity one end and the 63rd electric capacity one end respectively, the 36th electric capacity other end
Ground connection, the 63rd electric capacity other end connects the 49th resistance one end, and the 12nd operational amplifier electrode input end connects the 48th resistance one end,
The 48th resistance other end connects the 47th resistance one end and the 34th electric capacity one end respectively, and the 47th resistance other end connects analog switch control
No. 0 switch terminals of circuit processed, the 5th switch terminals connects the 41st resistance one end and the 32nd electric capacity one end respectively, another termination of the 41st resistance
Ground, the 32nd the electric capacity other end connect the 3rd output end of voltage stabilizer, the 3rd voltage-stablizer input connect respectively the 31st electric capacity one end and
40th resistance one end, the 31st electric capacity other end connects the 40th resistance other end, and the 7th switch terminals connects the 43rd resistance one end respectively
With the 42nd resistance one end, the 42nd resistance other end is grounded, the 43rd resistance other end connection the 11st operational amplifier output terminal, and the 4th
Switch terminals connects the 6th operational amplifier output terminal, and the 3rd switch terminals connects the 3rd operational amplifier output terminal, and second switch end divides
Not Lian Jie the 33rd electric capacity one end and the 44th resistance one end, the 33rd the electric capacity other end ground connection, the 44th the resistance other end connect the 2nd computing
Amplifier out, the first switch terminals connects the 46th resistance one end and the 53rd resistance one end respectively, and the 53rd resistance other end is respectively
Connecting the 12nd diode cathode and ground connection, the 46th resistance other end connects the 45th resistance one end and 24V power supply side respectively.Logical
Cross this analog switch control circuit can effectively carry out detecting control, make procedure inspection instrument preferably play detection effect.
1st, binding post operation principle: dissimilar according to the instrument being detected, selects corresponding binding post to incite somebody to action
Journey tester is attached with tested instrument.With will pass through upper computer software or mobile phone A PP tested instrument is carried out calibration and
Detection.
1st, 0V connect power supply bear, 24V is just connecing power supply
2nd, current detecting 1 passage be CT1 (+), CT2 (-)
3rd, current detecting 2 passage be CT5 (+), CT2 (-)
4th, outwards output electric current CT4 (+), CT3 (-)
5th, thermocouple output CT6 (+), CT7 (-)
6th, thermal resistance output CT8 (+), CT9 (-)
7th, thermocouple and voltage input CT12 (+), CT2 (-)
2nd, host computer operation principle: both can be carried out even by serial port data line between upper computer software and process checking gauge
Connect, it is also possible to communicated wirelessly by bluetooth module.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Specific features, structure, material or the spy that the description of example " or " some examples " etc. means to combine this embodiment or example describes
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or feature can be
Any one or more embodiment or example combine in an appropriate manner.
While there has been shown and described that embodiment of the present utility model, it will be understood by those skilled in the art that:
In the case of without departing from principle of the present utility model and objective, multiple change, modification, replacement can be carried out to these embodiments
And modification, scope of the present utility model is limited by claim and equivalent thereof.
Claims (8)
1. the imput output circuit for intelligent process check meter, it is characterised in that include: analog switch control circuit,
Analog to digital conversion circuit, thermocouple voltages output unit, thermocouple voltages input block, electric current back production circuit, isolation power distribution circuit,
Thermal resistance output circuit and D/A converting circuit；
Thermocouple voltages input block signal control end connects analog switch control circuit second switch end, and electric current back production circuit is believed
Number control end connects analog switch control circuit the 3rd switch terminals or the 6th switch terminals, thermocouple voltages output unit signal control
End processed connects D/A converting circuit signal end, and analog to digital conversion circuit signal output part connects analog switch control circuit the 7th switch
End, analog switch control circuit the 5th switch terminals connection mode number conversion circuit signal end, analog to digital conversion circuit control signal end is even
Connect MCU controller control signal end.
2. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described thermoelectricity
Even voltage input unit includes: thermocouple voltage input interface one end connects tested instrument, and the thermocouple voltage input interface other end divides
Not Lian Jie the 11st resistance one end and the 12nd resistance one end, the 12nd resistance other end connect respectively the 13rd resistance one end and control resistance
Switch, the 11st resistance other end connects the 20th electric capacity one end and the 7th diode cathode respectively, the 20th electric capacity other end ground connection, and the 7th
Diode cathode is grounded, and the 7th diode cathode is also connected with controlling resistance switch input terminal, and the 13rd resistance other end connects the respectively
14 resistance one end and control resistance switch input terminal, the 14th resistance other end ground connection, control resistance output switching terminal connects the 10th
Resistance one end, the 10th resistance other end connects the 19th electric capacity one end and the 2nd operational amplifier electrode input end respectively, the 19th electric capacity
The other end is grounded, and the 2nd operational amplifier output terminal connects the 2nd operational amplifier negative input and analog switch control electricity respectively
Road second switch end, the 2nd operational amplifier output terminal is also connected with the 18th electric capacity one end, the 18th electric capacity other end ground connection.
3. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described electric current
Back production circuit includes:
Electric current back production input interface one end connects tested instrument, and the electric current back production input interface other end connects the 18th resistance one respectively
End and the 8th diode cathode, the 8th diode cathode ground connection, the 18th resistance one end is also connected with the 3rd FET drain electrode, the 3rd effect
Should connect the 18th resistance other end and the 4th operational amplifier negative input respectively by pipe source electrode, the 4th operational amplifier output terminal is even
Connecing the 3rd fet gate, the 4th operational amplifier electrode input end connects the 16th resistance one end and the 17th resistance one end respectively,
16th resistance other end ground connection, the 17th resistance other end connects power end, and the 3rd FET source electrode is also connected with the 15th resistance one
End, the 15th resistance other end ground connection, the 15th resistance one end is also connected with the 3rd operational amplifier electrode input end, the 3rd operational amplifier
Negative input connects the 21st electric capacity one end and the 3rd operational amplifier output terminal, the 21st electric capacity other end ground connection, the 21st electricity respectively
Hold one end and be also connected with analog switch control circuit the 3rd switch terminals.
4. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described isolation
Power distribution circuit includes:
Accept distribution anode interface and connect the 4th FET drain electrode, accept distribution negative pole interface and connect the 21st resistance one end respectively
And ground connection, the 21st resistance other end connects the 23rd electric capacity one end and the 4th FET source electrode respectively, and the 4th fet gate is even
Connecing the 5th operational amplifier output terminal, the 23rd electric capacity one end is also connected with the 5th operational amplifier negative input, the 5th operational amplifier
Electrode input end connects the 22nd electric capacity one end, and the 22nd electric capacity other end ground connection, the 22nd electric capacity one end is also respectively connected with the 19th resistance
One end and the 20th resistance one end, the 20th resistance other end ground connection, it is defeated that the 19th resistance other end connects the 11st operational amplifier respectively
Go out end and the 62nd electric capacity one end, the 62nd electric capacity other end ground connection.
5. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described thermoelectricity
Even voltage output unit includes:
Thermocouple voltage output interface connects the 26th electric capacity one end and the 28th resistance one end respectively, and the 26th electric capacity other end is grounded, the
The 28 resistance other ends connect the 8th operational amplifier output terminal, and the 8th operational amplifier negative input connects the 10th diode respectively
Negative pole and the 26th electric capacity one end, the 10th diode cathode ground connection, the 8th operational amplifier electrode input end connects the 25th electric capacity one
End, the 25th electric capacity other end ground connection, the 25th electric capacity one end is also respectively connected with the 26th resistance one end and the 27th resistance one end, the 26th electricity
The resistance other end connects the 11st operational amplifier output terminal, the 27th resistance other end ground connection.
6. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described thermal resistance
Output circuit includes: thermal resistance output signal interface one end connects tested instrument, and thermal resistance output signal interface low-pressure end connects the 28th
Electric capacity one end, thermal resistance output signal interface high-pressure side connects the 29th electric capacity one end, and the 28th electric capacity other end ground connection, the 29th electric capacity is another
One end is grounded, and the 28th electric capacity one end is also respectively connected with the 35th resistance one end and the 9th operational amplifier negative input, the 9th computing
Amplifier anode input connects the 31st resistance one end and the 65th resistance one end respectively, and the 35th resistance other end connects the 9th computing
Amplifier out, the 31st resistance other end connects the 27th electric capacity one end and the 30th electric capacity one end respectively, the 65th resistance other end
Ground connection, the 27th electric capacity other end ground connection, the 30th resistance other end connection the second digital to analog converter (TLV5616) output, first
Digital to analog converter (TLV5616) and the second digital to analog converter are in parallel, and the 31st resistance other end is also connected with the 29th resistance one end, and the 29th
The resistance other end connects the first digital to analog converter output, and the 29th electric capacity one end is also connected with the 36th resistance one end, and the 36th resistance is another
One end connects the 11st diode cathode and the 37th resistance one end respectively, and the 37th resistance other end ground connection, the 37th resistance other end is also
Connecting the 11st diode cathode, the 11st diode cathode is also connected with the 34th resistance one end, and the 34th resistance other end connects the 10th fortune
Calculating amplifier anode input, the 10th operational amplifier negative input connects the 33rd resistance one end and the 32nd resistance one respectively
End, the 33rd resistance other end ground connection, the 32nd resistance other end connects the 10th operational amplifier output terminal, and the 10th operational amplifier is defeated
Go out end and be also respectively connected with the reference voltage input terminal of the first digital to analog converter (TLV5616) and the second digital to analog converter.
7. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described digital-to-analogue
Change-over circuit includes: analog-digital chip clock signal terminal connects MCU controller signals output, and analog-digital chip signal is defeated
Going out end and connecting the 39th resistance one end, the 39th resistance other end connects the 38th resistance one end and the 30th electric capacity one end respectively, the 30th electricity
Holding other end ground connection, the 39th resistance other end connects the 11st operational amplifier electrode input end, and the 11st operational amplifier negative pole is defeated
Enter end and connect the 11st operational amplifier output terminal and the 62nd electric capacity one end, the 62nd electric capacity other end ground connection, the 11st operational amplifier
Output is also connected with analog switch control circuit the 7th switch terminals.
8. the imput output circuit for intelligent process check meter according to claim 1, it is characterised in that described simulation
ON-OFF control circuit includes: modulus conversion chip reference voltage end connects the 38th electric capacity one end and the 39th electric capacity one end, the 38th electricity
Holding the other end and the 39th electric capacity other end connecting, modulus conversion chip signal input part connects MCU controller control signal end, mould
Number conversion chip positive terminal connects the 52nd resistance one end and the 37th electric capacity one end, the 37th electric capacity other end ground connection, the 52nd electricity respectively
The resistance other end connects the 63rd electric capacity one end and the 51st resistance one end respectively, and the 51st resistance other end connects the 50th resistance one end respectively
With the 49th resistance one end, the 50th resistance other end ground connection, the 49th resistance other end connects the 12nd operational amplifier negative input,
12nd operational amplifier offset side connects the 35th electric capacity one end, the 35th electric capacity other end ground connection, the 12nd operational amplifier output terminal
Connecting the 36th electric capacity one end and the 63rd electric capacity one end respectively, the 36th electric capacity other end ground connection, the 63rd electric capacity other end connects the 49th
Resistance one end, the 12nd operational amplifier electrode input end connects the 48th resistance one end, and the 48th resistance other end connects the 47th respectively
Resistance one end and the 34th electric capacity one end, the 47th resistance other end connects No. 0 switch terminals of analog switch control circuit, the 5th switch terminals
Connecting the 41st resistance one end and the 32nd electric capacity one end respectively, the 41st resistance other end ground connection, the 32nd electric capacity other end connects the 3rd
Output end of voltage stabilizer, the 3rd voltage-stablizer input connects the 31st electric capacity one end and the 40th resistance one end respectively, the 31st electric capacity another
End connects the 40th resistance other end, and the 7th switch terminals connects the 43rd resistance one end and the 42nd resistance one end respectively, and the 42nd resistance is another
One end is grounded, and the 43rd resistance other end connects the 11st operational amplifier output terminal, and it is defeated that the 4th switch terminals connects the 6th operational amplifier
Going out end, the 3rd switch terminals connects the 3rd operational amplifier output terminal, and second switch end connects the 33rd electric capacity one end and the 44th electricity respectively
Resistance one end, the 33rd electric capacity other end ground connection, the 44th resistance other end connects the 2nd operational amplifier output terminal, and the first switch terminals is divided
Not Lian Jie the 46th resistance one end and the 53rd resistance one end, the 53rd resistance other end connects the 12nd diode cathode and ground connection respectively,
The 46th resistance other end connects the 45th resistance one end and 24V power supply side respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620514342.XU CN205720625U (en) | 2016-05-25 | 2016-05-25 | Imput output circuit for intelligent process check meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620514342.XU CN205720625U (en) | 2016-05-25 | 2016-05-25 | Imput output circuit for intelligent process check meter |
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| Publication Number | Publication Date |
|---|---|
| CN205720625U true CN205720625U (en) | 2016-11-23 |
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| CN201620514342.XU Expired - Fee Related CN205720625U (en) | 2016-05-25 | 2016-05-25 | Imput output circuit for intelligent process check meter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656572A (en) * | 2017-10-27 | 2018-02-02 | 北京大华无线电仪器有限责任公司 | The multichannel variable voltage source and its control method realized with digital analog converter |
| WO2023071532A1 (en) * | 2021-11-01 | 2023-05-04 | 上海美控智慧建筑有限公司 | Input-output control circuit, controller, and air conditioner |
-
2016
- 2016-05-25 CN CN201620514342.XU patent/CN205720625U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107656572A (en) * | 2017-10-27 | 2018-02-02 | 北京大华无线电仪器有限责任公司 | The multichannel variable voltage source and its control method realized with digital analog converter |
| WO2023071532A1 (en) * | 2021-11-01 | 2023-05-04 | 上海美控智慧建筑有限公司 | Input-output control circuit, controller, and air conditioner |
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