CN206488794U - A kind of high precision electro bridge circuit of resistance strain type sensor - Google Patents
A kind of high precision electro bridge circuit of resistance strain type sensor Download PDFInfo
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- CN206488794U CN206488794U CN201720184408.8U CN201720184408U CN206488794U CN 206488794 U CN206488794 U CN 206488794U CN 201720184408 U CN201720184408 U CN 201720184408U CN 206488794 U CN206488794 U CN 206488794U
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- resistance
- instrumentation amplifier
- type sensor
- strain type
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Abstract
The utility model belongs to process detection field, and in particular to a kind of high precision electro bridge circuit of resistance strain type sensor.Circuit is by wheatstone bridge, four instrumentation amplifier G1, G2, G3 and G4, dc source USAnd VCCAnd current-limiting resistance R0, analog-to-digital conversion device ADC, two Multipexer selectors C1 and C2, processor MCU compositions.G1 input voltage is the uneven output voltage of electric bridge, and G2 input voltage is resistance R4The voltage difference at two ends, G3 input voltage is resistance R2The voltage difference at two ends, G4 input voltage is the voltage difference at electric bridge two ends.Processor MCU is linear using the output valve N, N and sensor resistance changes delta R of ratio as measurement result by controlling one group of signal of CTL signal behaviors to carry out analog-to-digital conversion, and can eliminate the influence of temperature.The utility model circuit has the very high degree of accuracy.
Description
Technical field
The utility model is related to process detection field, the high-precision electric bridge of more particularly to a kind of resistance strain type sensor
Circuit.
Background technology
Resistance strain type sensor occupies critical role in the Non-Electricity Measurements such as pressure, displacement, dependent variable and acceleration,
Have the advantages that simple in construction, performance stabilization, sensitivity are high, what is had is also adapted to dynamic measurement.However, resistance-strain type is present
One shortcoming, that is, its resistance value and sensitivity variation with temperature and change.Resistance strain type sensor is because of environment temperature
Change the resistance variations produced and almost have the identical order of magnitude in response to the resistance variations for becoming generation.What piezoresistive transducer was used
It is semi-conducting material, semi-conducting material is very sensitive to temperature.So being surveyed using resistance-strain type and piezoresistive transducer
Temperature-compensating is must take into consideration during amount, very big error is otherwise had.
In addition, when being measured using resistance-strain type and piezoresistive transducer, in order that the linearization of system,
The sensitivity and temperature-compensating of raising system, generally using full-bridge circuit.Full-bridge circuit requires the resistance variations of four sensors
Coefficient and temperature coefficient, which are tried one's best, accomplishes completely the same；It is required that two of which sensor is pressurized, two other sensor tension, tension and compression
Degree is tried one's best consistent with tension and compression direction.This manufacturing process and mounting condition to sensor has very high requirement
Therefore, in order to reduce influence of the difference to measuring results of sensor manufacturing process presence and mitigate to sensing
The requirement of device mounting condition in measuring system, while can also eliminate the influence of variation of ambient temperature, the utility model proposes one
The high precision electro bridge circuit of the resistance strain type sensor of sketch-based user interface method is planted, the circuit is passed only with two resistance-strain types
Sensor, and only one of which resistance strain type sensor acted on by power, reduces the cost of sensor, alleviates to sensor
The dependence of mounting condition and the requirement of sensor manufacturing process；And the effect of full-bridge circuit linearisation can be reached.
Utility model content
The technical scheme that the utility model is used is：
A kind of high precision electro bridge circuit of resistance strain type sensor is by wheatstone bridge, four instrumentation amplifiers G1, G2, G3
With G4, dc source USAnd VCCAnd current-limiting resistance R0, analog-to-digital conversion device ADC, two Multipexer selector C1 and C2, processors
MCU is constituted；
Four bridge arms of wheatstone bridge are respectively R by two resistances2、R4Precision resister and two resistances be R1、R3's
Identical resistance strain type sensor is constituted；R1To measure the resistance strain type sensor of pressure, R3The electricity compensated for system temperature
Hinder strain gauge transducer；
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 strain type sensor R1It is followed by dc source USNegative terminal, instrumentation amplifier G1 and
Instrumentation amplifier G3 in-phase end is connected on the centre of this two resistance；Supply voltage U anodes concatenation precision resister R4And resistance
Strain gauge transducer R3It is followed by dc source USNegative terminal, instrumentation amplifier G1 and instrumentation amplifier G2 it is anti-phase terminate at this two
The centre of individual resistance；The end of oppisite phase of instrumentation amplifier G2 in-phase end, instrumentation amplifier G3 end of oppisite phase and instrumentation amplifier G4
The supply voltage U anodes of electric bridge are connect, instrumentation amplifier G4 in-phase end is connected to dc source USNegative terminal；
Instrumentation amplifier G1 output terminates to Multipexer selector C1 CH1 roads road, instrumentation amplifier G2 output
Terminate to Multipexer selector C1 CH2 roads road；Instrumentation amplifier G3 output terminates to Multipexer selector C2 CH1
Road road, instrumentation amplifier G4 output terminates to Multipexer selector C2 CH2 roads road；
Multipexer selector C1 output end OUT is connected to analog-to-digital conversion device ADC AIN+ inputs, Multipexer selection
Device C2 output end OUT is connected to analog-to-digital conversion device ADC REF IN+ reference inputs, analog-to-digital conversion device ADC AIN- ends, 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；
Processor MCU power end VCC meets dc source VCC, chip selection signal CTL is connected to Multipexer selector C1 and C2
CTL ends, processor MCU GND ends are connected to dc source USNegative terminal.
The course of work is：Instrumentation amplifier G1 input voltage U01For the uneven output voltage of electric bridge, instrumentation amplifier G2
Input voltage U02For resistance R4The voltage difference at two ends, instrumentation amplifier G3 input voltage U03For resistance R2The voltage at two ends
Difference, instrumentation amplifier G4 input voltage U04For the voltage difference at electric bridge two ends.After Multipexer selector, U01And U03Make
For one group of analog-to-digital conversion signal, U02And U04As another group of analog-to-digital conversion signal, processor MCU is by controlling CTL signal behaviors
One of which signal carries out analog-to-digital conversion.Select U01And U03When analog-to-digital conversion result be N1, select U02And U04When analog-to-digital conversion
Result be N2。N1And N2After converting, processor MCU carries out a division arithmetic, by N1And N2Ratio be used as measurement knot
The output valve N of fruit.
Advantageous effects of the present utility model are：N and sensor resistance changes delta R are linear, can reach complete
The effect of bridge circuit linearisation；Resistance variations Δ R caused by N and variation of ambient temperaturetIt is unrelated, the influence of temperature can be eliminated.System
High accuracy instrumentation amplifier is used in system, then system has a very high degree of accuracy, and can facilitate the sensitivity of regulating system,
With very strong practical value.
Brief description of the drawings
Accompanying drawing 1 is the high precision electro bridge circuit of resistance strain type sensor.
Embodiment
The embodiment to the utility model device is described further below in conjunction with the accompanying drawings.
In accompanying drawing 1, R1And R3For identical resistance strain type sensor, R1To measure the resistance strain type sensor of pressure,
R3Resistance strain type sensor, R are compensated for system temperature2And R4For high accuracy resistance.U01For the uneven output voltage of electric bridge,
U02For resistance R4The voltage difference at two ends, U03For resistance R2The voltage difference at two ends, U04For the voltage difference at electric bridge two ends.Ordinary circumstance
Under, resistance strain type sensor R in electric bridge1Initial value is R, and resistance-strain variable quantity is the change of resistance after Δ R, temperature change
Measure as Δ Rt；R2=R3=R4=R, then have：
U04=U (4)
U01And U02Amplify G respectively through instrumentation amplifier G1 and G21And G2It is defeated as analog-to-digital conversion device ADC simulation after times
Enter, U03And U04Amplify G respectively through instrumentation amplifier G3 and G43And G4Analog-to-digital conversion device ADC reference voltage is used as after times.Through
Cross after Multipexer selector, U01And U03It is used as one group of analog-to-digital conversion signal, U02And U04As another group of analog-to-digital conversion signal,
Processor MCU is by controlling CTL signal behavior one of which signal to carry out analog-to-digital conversion.Select U01And U03When analog-to-digital conversion
As a result it is N1, select U02And U04When analog-to-digital conversion result be N2.If analog-to-digital conversion device ADC resolving power is n, it can obtain：
N1And N2After converting, processor MCU carries out a division arithmetic, by N1And N2Ratio be used as measurement result
Output valve N.
From formula (7), N and sensor resistance changes delta R are linear, and explanation can reach that full-bridge circuit is linearized
Effect；Resistance variations Δ R caused by N and variation of ambient temperaturetIt is unrelated, illustrate that the influence of temperature can be eliminated.Used in system
High accuracy instrumentation amplifier, then system has the very high degree of accuracy, and can facilitate the sensitivity of regulating system, with very strong
Practical value.In addition, system is acted on only with two sensors, and only one of which sensor by power, biography is reduced
The cost of sensor, alleviates the dependence to sensor mounting condition and the requirement of sensor manufacturing process.
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. the high precision electro bridge circuit of a kind of resistance strain type sensor, it is characterised in that circuit is used by wheatstone bridge, four instrument
Amplifier G1, G2, G3 and G4, dc source USAnd VCCAnd current-limiting resistance R0, analog-to-digital conversion device ADC, the selection of two Multipexers
Device C1 and C2, processor MCU compositions；Four bridge arms of wheatstone bridge are respectively R by two resistances2、R4Precision resister and two
Individual resistance is R1、R3Identical resistance strain type sensor composition；R1Measure the resistance strain type sensor of pressure, R3To be
The resistance strain type sensor of system temperature-compensating；Electric bridge DC power supply USBy current-limiting resistance R0It is electric bridge after partial pressure
Supply voltage U；The supply voltage U anodes series resistor high accuracy R of electric bridge2With resistance strain type sensor R1It is followed by direct current
Source USNegative terminal, instrumentation amplifier G1 and instrumentation amplifier G3 in-phase end are connected on the centre of this two resistance；Supply voltage U anodes
Concatenate precision resister R4With resistance strain type sensor R3It is followed by dc source USNegative terminal, instrumentation amplifier G1 and instrument are with putting
The big device G2 anti-phase centre for terminating at this two resistance；Instrumentation amplifier G2 in-phase end, instrumentation amplifier G3 end of oppisite phase
With the supply voltage U anodes of instrumentation amplifier G4 anti-phase termination electric bridge, instrumentation amplifier G4 in-phase end is connected to dc source
USNegative terminal；Instrumentation amplifier G1 output terminates to Multipexer selector C1 CH1 roads road, instrumentation amplifier G2 output end
It is connected to Multipexer selector C1 CH2 roads road；Instrumentation amplifier G3 output terminates to Multipexer selector C2 CH1 roads
Road, instrumentation amplifier G4 output terminates to Multipexer selector C2 CH2 roads road；Multipexer selector C1 output end
OUT is connected to analog-to-digital conversion device ADC AIN+ inputs, and Multipexer selector C2 output end OUT is connected to analog-to-digital conversion device ADC
REF IN+ reference inputs, analog-to-digital conversion device ADC AIN- ends, 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；Processor MCU power end VCC meets dc source VCC, piece choosing letter
Number CTL is connected to Multipexer selector C1 and C2 CTL ends, and processor MCU GND ends are connected to dc source USNegative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720184408.8U CN206488794U (en) | 2017-02-28 | 2017-02-28 | A kind of high precision electro bridge circuit of resistance strain type sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720184408.8U CN206488794U (en) | 2017-02-28 | 2017-02-28 | A kind of high precision electro bridge circuit of resistance strain type sensor |
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| CN206488794U true CN206488794U (en) | 2017-09-12 |
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| CN201720184408.8U Expired - Fee Related CN206488794U (en) | 2017-02-28 | 2017-02-28 | A kind of high precision electro bridge circuit of resistance strain type sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006330A (en) * | 2019-04-17 | 2019-07-12 | 中国工程物理研究院化工材料研究所 | A kind of strain testing zero circuit of width Standard resistance range resistance strain sensor |
| WO2021022459A1 (en) * | 2019-08-05 | 2021-02-11 | 深圳市汇顶科技股份有限公司 | Detection circuit of bridge sensor, chip and detection system |
| CN113155159A (en) * | 2020-12-30 | 2021-07-23 | 南京英锐创电子科技有限公司 | Bridge type detector |
-
2017
- 2017-02-28 CN CN201720184408.8U patent/CN206488794U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006330A (en) * | 2019-04-17 | 2019-07-12 | 中国工程物理研究院化工材料研究所 | A kind of strain testing zero circuit of width Standard resistance range resistance strain sensor |
| WO2021022459A1 (en) * | 2019-08-05 | 2021-02-11 | 深圳市汇顶科技股份有限公司 | Detection circuit of bridge sensor, chip and detection system |
| US11686598B2 (en) | 2019-08-05 | 2023-06-27 | Shenzhen GOODIX Technology Co., Ltd. | Detection circuit of bridge sensor, chip and detection system |
| CN113155159A (en) * | 2020-12-30 | 2021-07-23 | 南京英锐创电子科技有限公司 | Bridge type detector |
| CN113155159B (en) * | 2020-12-30 | 2023-12-08 | 南京英锐创电子科技有限公司 | Bridge detector |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170912 Termination date: 20180228 |