CN204115945U - A kind of non-linear compensation circuit of resistance bridge type sensor - Google Patents
A kind of non-linear compensation circuit of resistance bridge type sensor Download PDFInfo
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- CN204115945U CN204115945U CN201420526110.7U CN201420526110U CN204115945U CN 204115945 U CN204115945 U CN 204115945U CN 201420526110 U CN201420526110 U CN 201420526110U CN 204115945 U CN204115945 U CN 204115945U
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- resistance
- type sensor
- bridge type
- resistance bridge
- signal amplification
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Abstract
The utility model belongs to sensor technical field, it discloses the non-linear compensation circuit of resistance bridge type sensor, comprise resistance bridge type sensor, excitation voltage source, signal amplification circuit, between resistance bridge type sensor and the negative terminal of electric bridge power supply, serial connection common-mode resistance; Signal amplification circuit output terminal is contacted mutually by feedback resistance and common-mode resistance.The utility model has the advantages that: the signal (voltage) experienced by resistance bridge type sensor after external information conversion amplifies through signal amplification circuit, and with after proper proportion (change feedback resistance) and common mode electric resistance partial pressure, thus achieve the nonlinear compensation to the resistance bridge output type sensor that output signal sensitivity increases progressively.In addition the signal amplification circuit A in circuit can adopt Digitally programmable amplifier, can impose digital modulation zero-bit and full scale, reduces the impact that precision is low, degree of stability is poor brought owing to changing resistance in debug process.Improve measuring accuracy and the stability of sensor.
Description
Technical field
The utility model belongs to sensor technical field, is specifically related to a kind of non-linear compensation circuit of resistance bridge type sensor.
Background technology
Sensor is each field application of industrial process, meteorology, environmental protection, defence engineering and even daily life measurement instrument widely, by the restriction of material and progress technology, most sensor, the particularly sensor of resistance bridge output type, when input signal linearly changes, sensor output voltage is not linear change, will bring the error more than 1% thus, makes the measuring accuracy of sensor very low.
There are two kinds of processing modes for there being the resistance bridge type sensor of non-linear output characteristic: one does not carry out nonlinear compensation, directly the output signal of sensor carried out voltage amplification, then give follow-up detection system.This is all generally to the less demanding situation of accuracy of measurement; Another kind carries out nonlinear compensation to the nonlinear characteristic of sensor, if this generally belongs to the situation that cannot meet the demands when follow-up system does not carry out nonlinear compensation to accuracy of measurement requirement is higher.Its method adopted is look-up table, curve fitting method and neural network mostly, is all to utilize single-chip microcomputer test biosensor output parameter and carry out software process, and then eliminates the non-linear measuring error brought in output signal, improves measuring accuracy.This also brings the raising of material cost thus, expends more manpower and time, and the cost of manufacture of sensor is significantly increased, can not volume shipment in time.
Utility model content
The technical problems to be solved in the utility model is: overcome the deficiencies in the prior art, there is provided a kind of with the non-linear compensation circuit of low cost, high-level efficiency, connection simple resistance bridge type sensor, reach and can realize high-acruracy survey, the object of high cost performance can be accomplished again.
The utility model solves the technical scheme that its technical matters adopts: a kind of non-linear compensation circuit of resistance bridge type sensor, comprise a resistance bridge type sensor, an excitation voltage source, a signal amplification circuit, it is characterized in that: between described resistance bridge type sensor and the negative terminal of electric bridge power supply, be connected in series a common-mode resistance; Signal amplification circuit output terminal is contacted mutually by a feedback resistance and described common-mode resistance.
Preferably, the output signal sensitivity of described resistance bridge type sensor increases with the increase of input signal.
Preferably, four arms of described sensor bridge are substitutional resistance.
Preferably, described excitation voltage source is reference voltage source.
Preferably, described signal amplification circuit is digital zero setting, the programmable instrumentation amplifier adjusting full scale.
Compared with prior art, the beneficial effects of the utility model are: the signal (voltage) after external information conversion experienced by resistance bridge type sensor by the utility model amplifies through signal amplification circuit A, and with after proper proportion (changing feedback resistance RF) and common-mode resistance RC dividing potential drop, thus achieve the nonlinear compensation to the resistance bridge output type sensor that output signal sensitivity increases progressively.In addition the signal amplification circuit A in circuit can adopt Digitally programmable amplifier, can impose digital modulation zero-bit and full scale, reduces the impact that precision is low, degree of stability is poor brought owing to changing resistance in debug process; Improve measuring accuracy and the stability of sensor.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing embodiment, the utility model is described further:
Embodiment one
As shown in Figure 1, a kind of non-linear compensation circuit of resistance bridge type sensor, comprises resistance bridge type sensor, excitation voltage source VR, signal amplification circuit A; Excitation voltage source VR electrically connects resistance bridge type sensor, and the input end of resistance bridge type sensor output and signal amplification circuit A electrically connects; Four arms of resistance bridge type sensor are substitutional resistance, excitation voltage source VR is reference voltage source, signal amplification circuit A is digital zero setting, the programmable instrumentation amplifier PGA adjusting full scale, and the output signal sensitivity of resistance bridge type sensor increases with the increase of input signal; Between resistance bridge type sensor and the negative terminal of electric bridge power supply, serial connection common-mode resistance RC; The output terminal of signal amplification circuit A is contacted by feedback resistance RF and common-mode resistance RC phase.
In specific implementation process, when the sensitivity of resistance bridge type sensor increases progressively, as long as change the value of RF, RC, the output valve of signal amplification circuit A just can be made to reduce with the increase of the sensitivity of resistance bridge type sensor, the amount reduced is just contrary with the value equal and opposite in direction that the output sensitivity of resistance bridge type sensor increases progressively, direction, thus achieves the nonlinear compensation of resistance bridge type sensor.Be curve of output described in present embodiment be upper Parabolic, its maximum nonlinearity erron appears at the mid point of range, and signal amplification circuit A can adopt digital zero setting, adjust the programmable instrumentation amplifier PGA of full scale.
Non-linear compensation circuit when resistance bridge type sensor is diaphragm pressure sensor, be specially: diaphragm pressure sensor chip adopts sputtered metal film material, there is output signal and be changed to upper parabolical nonlinear characteristic with input signal, measurement range is 0 ~ 40MPa, output signal 0 ~ 8mV, the electric bridge output resistance of diaphragm pressure sensor is 3.6K Ω; Signal amplification circuit A adopts programmable instrumentation amplifier PGA, can digital modulation zero-bit and enlargement factor, and the value of reference voltage V R is 4.096V.Time in prior art without RC and RF, then the nonlinearity erron that signal amplification circuit A outputs signal is 0.5%FS; Connect RC and RF in the utility model, and when being defined as RC=21 K Ω and RF=220 Ω after repeatedly adjusting, obtain following test data:
| Test point (MPa) | 0 | 5 | 10 | 15 | 20 | 25 | 30 | 35 | 40 |
| Positive stroke (mA) | 4.000 | 5.996 | 7.996 | 9.997 | 11.999 | 13.999 | 15.999 | 18.000 | 20.000 |
| Positive stroke (mA) | 4.000 | 6.000 | 8.005 | 9.999 | 12.004 | 14.004 | 16.005 | 18.001 | ? |
As can be seen from above-mentioned test data, output signal its nonlinearity erron after amplification and non-linear compensation circuit of diaphragm pressure sensor reduces greatly, and the average nonlinear error of its positive revesal is less than 0.025%FS.
Above, be only preferred embodiment of the present utility model, be not restriction the utility model being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solutions of the utility model content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present utility model, still belong to the protection domain of technical solutions of the utility model.
Claims (5)
1. the non-linear compensation circuit of a resistance bridge type sensor, comprise a resistance bridge type sensor, an excitation voltage source, a signal amplification circuit, it is characterized in that: between described resistance bridge type sensor and the negative terminal of electric bridge power supply, be connected in series a common-mode resistance; The output terminal of described signal amplification circuit is contacted mutually by a feedback resistance and described common-mode resistance.
2. the non-linear compensation circuit of resistance bridge type sensor according to claim 1, is characterized in that: the output signal sensitivity of described resistance bridge type sensor increases with the increase of input signal.
3. the non-linear compensation circuit of resistance bridge type sensor according to claim 1 and 2, is characterized in that: four arms of described sensor bridge are substitutional resistance.
4. the non-linear compensation circuit of resistance bridge type sensor according to claim 3, is characterized in that: described excitation voltage source VR is reference voltage source.
5. the non-linear compensation circuit of resistance bridge type sensor according to claim 4, is characterized in that: described signal amplification circuit is digital zero setting, the programmable instrumentation amplifier adjusting full scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420526110.7U CN204115945U (en) | 2014-09-15 | 2014-09-15 | A kind of non-linear compensation circuit of resistance bridge type sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420526110.7U CN204115945U (en) | 2014-09-15 | 2014-09-15 | A kind of non-linear compensation circuit of resistance bridge type sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204115945U true CN204115945U (en) | 2015-01-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420526110.7U Withdrawn - After Issue CN204115945U (en) | 2014-09-15 | 2014-09-15 | A kind of non-linear compensation circuit of resistance bridge type sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296919A (en) * | 2014-09-15 | 2015-01-21 | 青岛航天半导体研究所有限公司 | Nonlinear compensating circuit of resistance bridge type sensor |
-
2014
- 2014-09-15 CN CN201420526110.7U patent/CN204115945U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296919A (en) * | 2014-09-15 | 2015-01-21 | 青岛航天半导体研究所有限公司 | Nonlinear compensating circuit of resistance bridge type sensor |
| CN104296919B (en) * | 2014-09-15 | 2017-07-11 | 青岛航天半导体研究所有限公司 | A kind of non-linear compensation circuit of resistance bridge type sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20150121 Effective date of abandoning: 20170711 |
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| AV01 | Patent right actively abandoned |