CN206488792U - A kind of high-precision single arm bridge circuit of sketch-based user interface method - Google Patents
A kind of high-precision single arm bridge circuit of sketch-based user interface method Download PDFInfo
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- CN206488792U CN206488792U CN201720177392.8U CN201720177392U CN206488792U CN 206488792 U CN206488792 U CN 206488792U CN 201720177392 U CN201720177392 U CN 201720177392U CN 206488792 U CN206488792 U CN 206488792U
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- conversion device
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Abstract
The utility model belongs to process detection field, and in particular to a kind of high-precision single arm bridge circuit of sketch-based user interface method.Circuit is by wheatstone bridge, two instrumentation amplifier G1 and G2, dc source USAnd VCCAnd current-limiting resistance R0, analog-to-digital conversion device ADC composition；Four bridge arms of wheatstone bridge are respectively R by three resistances2、R3、R4Precision resister and resistance be R1Resistance sensor composition；The uneven output U of electric bridge01With the voltage U of another arm in electric bridge the same side02After amplification in access analog-to-digital conversion device ADC, the U of amplification01It is used as analog-to-digital conversion device ADC analog input voltage, the U of amplification02As analog-to-digital conversion device ADC reference voltage, the value of the digital quantity N by analog-to-digital conversion and the variation delta R of resistance are linear relationships.The utility model circuit has the very high degree of accuracy.
Description
Technical field
The utility model is related to process detection field, more particularly to a kind of high-precision single arm bridge circuit.
Background technology
Resistance sensor is in all trades and professions such as the measurement of the thermal parameters such as temperature, pressure, flow and gas analysis instrument
All it is widely used.Its operation principle is, by the measured change for being converted into sensor resistance, to pass through measurement sensor resistance
The change of value is measured to measure indirectly.Resistance sensor can substantially be divided into resistance-strain type, pressure resistance type and TR three
Class.In order to accurately be measured, it is necessary to which signal conditioning circuit is converted to the change of resistance the change of voltage or electric current, Ran Houtong
Cross analog-digital converter to be digitized, for follow-up display or processing.
Because resistance sensor resistance signal changes very faint, constant flow source measuring electric-resistivity method and bridge method are generally used.It is permanent
Stream source measuring resistance method is more directly perceived, but to realize that accurate measurement necessarily requires high accuracy constant-current source.Consider that high current can make electricity
Resistance produces fuel factor to influence accuracy of measurement, it is necessary to use small current constant-current source.At present, the measurement of resistance sensor is general
All over bridge method is used, bridge method can be divided into wheatstone bridge and differential bridge, most commonly wheatstone bridge circuit.But single armed
There is problems with electric bridge：The change of resistance and the imbalance of electric bridge are output as non-linear relation；The uneven output of electric bridge by
Mains fluctuations influence；The change of electric bridge overall electrical resistance also can produce influence to electric bridge imbalance output.So, wheatstone bridge
Circuit can not meet the high accuracy of resistance sensor measurement.Differential bridge can solve the non-thread of input and output well
Property, but there is also problems with：Multiple resistance sensors are needed to use, system cost is improved, reduction resistance sensor makes
With rate；It can not solve to cause electric bridge both end voltage to change the influence to measuring results when measurement or temperature change；It is required that structure
There is good uniformity into differential resistance sensor performance；It must assure that when resistance sensor is installed strict symmetrical
Property；Some resistance sensors can not use differential bridge, such as TR sensor.
The utility model, proposes a kind of high-precision single arm electric bridge electricity of sketch-based user interface method on the basis of wheatstone bridge circuit
Road, the circuit overcomes the influence of non-linear in wheatstone bridge principle and bridge voltage, disclosure satisfy that resistance sensor is measured
High accuracy requirement.
Utility model content
The technical scheme that the utility model is used is：
A kind of high-precision single arm bridge circuit of sketch-based user interface method is by wheatstone bridge, two instrumentation amplifiers G1 and G2, straight
Flow power supply USAnd VCCAnd current-limiting resistance R0, analog-to-digital conversion device ADC composition.
Four bridge arms of wheatstone bridge are respectively R by three resistances2、R3、R4Precision resister and resistance be R1's
Resistance sensor is constituted；
Electric bridge DC power supply USBy current-limiting resistance R0It is the supply voltage U of electric bridge after partial pressure；The power supply electricity of electric bridge
Press U anodes series resistor high accuracy R2With resistance sensor R1It is followed by dc source USNegative terminal, instrumentation amplifier G1 same phase
End and the instrumentation amplifier G2 anti-phase centre for terminating at this two resistance；Supply voltage U anodes series resistor high accuracy R3And R4
It is followed by dc source USNegative terminal, the instrumentation amplifier G1 anti-phase centre for terminating at this two resistance；Instrumentation amplifier G2's
In-phase end connects the supply voltage U anodes of electric bridge；
Analog-to-digital conversion device ADC resolving power is n, and instrumentation amplifier G1 output terminates to analog-to-digital conversion device ADC AIN
Input, instrumentation amplifier G2 output terminates to analog-to-digital conversion device ADC REF IN+ reference inputs, analog-to-digital conversion device ADC
REF IN- ends and GND ends be connected to dc source USNegative terminal, analog-to-digital conversion device ADC power end VCC meets dc source VCC。
The course of work is：The uneven output U of electric bridge01With the voltage U of another arm in electric bridge the same side02After amplification
Access in analog-to-digital conversion device ADC, the U of amplification01It is used as analog-to-digital conversion device ADC analog input voltage, the U of amplification02It is used as modulus
Converter ADC reference voltage, then the value of the digital quantity N Jing Guo analog-to-digital conversion and the variation delta R of resistance are linear relationships, with
Dc source USReference voltage with analog-to-digital conversion device ADC is not related.
Advantageous effects of the present utility model are：The instrument of arm resistance and high accuracy according to high accuracy is with putting
Big device, then system is with the very high degree of accuracy.
Brief description of the drawings
Accompanying drawing 1 is the high-precision single arm bridge circuit of sketch-based user interface method.
Accompanying drawing 2 is traditional wheatstone bridge circuit.
Embodiment
The embodiment to the utility model device is described further below in conjunction with the accompanying drawings.
Compared with traditional wheatstone bridge, the difference of the high-precision single arm bridge circuit of sketch-based user interface method is, will
The magnitude of voltage of another arm of electric bridge homonymy as analog-digital converter reference voltage, be so achieved that electric bridge uneven output and
Ratio between the voltage of another arm of homonymy.
R in the traditional wheatstone bridge circuit of accompanying drawing 21For resistance sensor, R2、R3、R4For precision resister, electric bridge is supplied
Direct current electric source US, by current-limiting resistance R0The supply voltage of electric bridge is U after partial pressure, and the uneven output U0 of electric bridge passes through instrument
After being amplified with amplifier, analog-to-digital conversion device ADC simulation input is used as.U can be obtained0Value：
If analog-to-digital conversion device ADC resolving power is n, it can obtain after ADC analog-to-digital conversions digital after analog-to-digital conversion
Measure N value：
Generally, electric resistance sensor R in electric bridge1Initial value is R, and variable quantity is Δ R；R2=R3=R4=R, then have：
From formula (1), formula (2) and formula (3), there is following ask in the value for eventually passing through the output digital quantity N after ADC conversions
Topic：
1) N and resistance change Δ R have nonlinearity erron not into strict linear relationship in principle；
2) N is influenceed by analog-to-digital conversion device ADC reference voltages, and the error of reference voltage can be also introduced into measurement result；
3) fluctuation of supply voltage or error cause the change of electric bridge both end voltage, so as to influence measurement result；
4) change of electric bridge overall electrical resistance caused by measurement or temperature change can cause the change of electric bridge both end voltage, so that
Influence measurement result.
The wheatstone bridge circuit of sketch-based user interface method shown in accompanying drawing 1 is generally consistent with traditional wheatstone bridge circuit, there is change
What is changed is analog-to-digital conversion device ADC reference voltage.The uneven output U of electric bridge01With the voltage U of another arm in electric bridge the same side02Can
It is expressed as：
The two is accessed in analog-to-digital conversion device ADC after amplification, the U of amplification01Simulation as analog-to-digital conversion device ADC is defeated
Enter voltage, the U of amplification02As analog-to-digital conversion device ADC reference voltage, then the value of the digital quantity N Jing Guo analog-to-digital conversion is：
Formula (4) and formula (5) are substituted into, can be obtained：
Generally, electric resistance sensor R in electric bridge1Initial value is R, and variable quantity is Δ R；R2=R3=R4=R, then have：
By formula (8) Suo Shi, it is linear to export digital quantity N value and the variation delta R of resistance after analog-to-digital conversion device ADC
Relation, with dc source USReference voltage with analog-to-digital conversion device ADC is not related.According to high accuracy arm resistance and
The instrumentation amplifier of high accuracy, then system is with the very high degree of accuracy.
Above-described is only preferred embodiment of the present utility model, and the utility model is not limited to above example.Can
To understand, what those skilled in the art directly exported or associated on the premise of spirit of the present utility model and design is not departed from
Oher improvements and changes, are considered as being included within protection domain of the present utility model.
Claims (1)
1. a kind of high-precision single arm bridge circuit of sketch-based user interface method, it is characterised in that circuit is by wheatstone bridge, two instrument with putting
Big device G1 and G2, dc source USAnd VCCAnd current-limiting resistance R0, analog-to-digital conversion device ADC composition；Four bridge arms of wheatstone bridge by
Three resistances are respectively R2、R3、R4Precision resister and resistance be R1Resistance sensor composition；Dc source USThrough
Cross current-limiting resistance R0It is the supply voltage U of electric bridge after partial pressure；The supply voltage U anodes series resistor high accuracy R of electric bridge2And electricity
Resistive sensor R1It is followed by dc source USNegative terminal, instrumentation amplifier G1 in-phase end and instrumentation amplifier G2 anti-phase termination
In the centre of this two resistance；Supply voltage U anodes series resistor high accuracy R3And R4It is followed by dc source USNegative terminal, instrument is used
The amplifier G1 anti-phase centre for terminating at this two resistance；Instrumentation amplifier G2 in-phase end is meeting the supply voltage U of electric bridge just
End；Instrumentation amplifier G1 output terminates to analog-to-digital conversion device ADC AIN inputs, and instrumentation amplifier G2 output is terminated to
Analog-to-digital conversion device ADC REF IN+ reference inputs, analog-to-digital conversion device ADC REF IN- ends and GND ends are connected to dc source
USNegative terminal, analog-to-digital conversion device ADC power end VCC meets dc source VCC。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720177392.8U CN206488792U (en) | 2017-02-27 | 2017-02-27 | A kind of high-precision single arm bridge circuit of sketch-based user interface method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720177392.8U CN206488792U (en) | 2017-02-27 | 2017-02-27 | A kind of high-precision single arm bridge circuit of sketch-based user interface method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206488792U true CN206488792U (en) | 2017-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720177392.8U Expired - Fee Related CN206488792U (en) | 2017-02-27 | 2017-02-27 | A kind of high-precision single arm bridge circuit of sketch-based user interface method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702709A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
-
2017
- 2017-02-27 CN CN201720177392.8U patent/CN206488792U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113702709A (en) * | 2021-07-20 | 2021-11-26 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
| CN113702709B (en) * | 2021-07-20 | 2024-04-09 | 中国电力科学研究院有限公司 | Method for measuring resistance value of high-voltage arm of direct-current voltage transformer |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170912 Termination date: 20180227 |
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| CF01 | Termination of patent right due to non-payment of annual fee |