CN205537689U - Foil gage zero setting circuit - Google Patents
Foil gage zero setting circuit Download PDFInfo
- Publication number
- CN205537689U CN205537689U CN201620277055.1U CN201620277055U CN205537689U CN 205537689 U CN205537689 U CN 205537689U CN 201620277055 U CN201620277055 U CN 201620277055U CN 205537689 U CN205537689 U CN 205537689U
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- Prior art keywords
- amplifier
- zeroing
- resistance
- foil gauge
- input
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Abstract
The utility model relates to a foil gage zero setting circuit, including first resistance, second resistance, third resistance, amplifier circuit and zero set controller, first ohmic connection is between the first incoming end of foil gage and amplifier circuit's first input end, the second incoming end of foil gage is connected to amplifier circuit's second input, amplifier circuit's first input end is through the 3rd grounding, and the second incoming end of foil gage is through the 2nd grounding, amplifier circuit's first input end and output are connected respectively to the zero set controller, first incoming end and second incoming end insert the foil gage of treating the zero set, and the first voltage of amplifier circuit first input end and the second voltage of second input change, and the zero set controller detects the output voltage of amplifier circuit output to adjusting the voltage of input amplifier circuit first input end, realizing the zero set of foil gage, it can realize the autozero to the foil gage, improves the zero set efficiency of foil gage.
Description
Technical field
This utility model relates to electronic technology field, particularly relates to a kind of foil gauge zeroing circuit.
Background technology
Foil gauge, because of its sensitivity to local environment, is widely used in various kinds of sensors.But,
Relevant parameter or performance just because of foil gauge are the most affected by environment, make foil gauge install to relevant
Before sensor, easy generation affected by environment is flexible waits change, makes to be mounted with the sensor of above-mentioned foil gauge
There is during work bigger error, the most just need foil gauge is carried out zeroing process.
Traditional foil gauge zeroing scheme needs to realize wherein straining by the access resistance adjusting in related circuit
The zeroing of sheet, zeroing efficiency is low.
Utility model content
Based on this, it is necessary to for the traditional scheme inefficient technical problem of zeroing, it is provided that a kind of foil gauge is adjusted
Zero circuit.
A kind of foil gauge zeroing circuit, including the first resistance, the second resistance, the 3rd resistance, amplifying circuit and
Zeroing controller；
Described first resistance is connected between the first incoming end and the first input end of amplifying circuit of foil gauge,
Second input of described amplifying circuit connects the second incoming end of foil gauge, and the first of described amplifying circuit is defeated
Enter end and pass through the second resistance eutral grounding, described zeroing control by the 3rd resistance eutral grounding, the second incoming end of foil gauge
Device processed connects first input end and the outfan of amplifying circuit respectively；
Described first incoming end and the second incoming end access foil gauge to be returned to zero, amplifying circuit first input end
The first voltage and the second voltage of the second input change, zeroing controller detection amplifying circuit output
The output voltage of end, and regulate the voltage of input amplifying circuit first input end, to realize the zeroing of foil gauge.
Above-mentioned foil gauge zeroing circuit, accesses foil gauge to be returned to zero by the first resistance, the second resistance and the
In the Wheatstone bridge of three resistance compositions, the micronormal produced at above-mentioned Wheatstone bridge after making foil gauge strain
The difference signal output to amplifying circuit, utilizes zeroing controller to detect the output of above-mentioned amplifying circuit, and regulates
The voltage of input amplifying circuit, after the output valve of amplifying circuit reaches the static base voltage of amplifying circuit,
The zeroing of the foil gauge that just can achieve a butt joint in related circuit, its can realize to corresponding foil gauge from
Dynamic zeroing, improves the zeroing efficiency of foil gauge.
Accompanying drawing explanation
Fig. 1 is the foil gauge zeroing circuit structural representation of an embodiment；
Fig. 2 is the foil gauge zeroing circuit structural representation of an embodiment；
Fig. 3 is the foil gauge zeroing circuit structural representation of an embodiment.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the foil gauge zeroing circuit that this utility model provides is carried out in detail
Thin elaboration.
The foil gauge zeroing circuit structural representation of an embodiment it is shown, including first with reference to Fig. 1, Fig. 1
Resistance the 11, second resistance the 12, the 3rd resistance 13, amplifying circuit 20 and zeroing controller 30；
Described first resistance 11 is connected to the first incoming end of foil gauge and the first input end of amplifying circuit 20
Between, the second input of described amplifying circuit 20 connects the second incoming end of foil gauge, described amplifying circuit
The first input end of 20 passes through the 3rd resistance 13 ground connection, and the second incoming end of foil gauge passes through the second resistance 12
Ground connection, described zeroing controller 30 connects first input end and the outfan of amplifying circuit 20 respectively；Above-mentioned
First incoming end of foil gauge can also connect external power source；
Described first incoming end and the second incoming end access foil gauge to be returned to zero, and amplifying circuit 20 first inputs
First voltage V1 of end and the second voltage V2 of the second input changes, and zeroing controller 30 detects
The output voltage Vo of amplifying circuit 20 outfan, and regulate the voltage of input amplifying circuit first input end, real
The zeroing of existing foil gauge.
The foil gauge zeroing circuit that the present embodiment provides, foil gauge to be returned to zero is accessed by the first resistance 11,
Second resistance 12 and the 3rd resistance 13 composition Wheatstone bridge in, make foil gauge strain after above-mentioned favour this
The micronormal difference signal that energising bridge the produces output to amplifying circuit 20, utilizes in zeroing controller 30 detection
State the output of amplifying circuit 20, and regulate the voltage of input amplifying circuit 20, in the output of amplifying circuit 20
After value reaches the static base voltage of amplifying circuit 20, just can achieve a butt joint the foil gauge in related circuit
Zeroing, it can realize the automatic zero set to foil gauge, improve the zeroing efficiency of foil gauge.
In one embodiment, above-mentioned zeroing controller can include single-chip microcomputer.
The present embodiment uses single-chip microcomputer to be amplified detection and the first input end input electricity of circuit output voltage
The regulation of pressure, can realize carrying of efficiency on the basis of ensureing coherent detection and regulation accuracy further
High.
The foil gauge zeroing circuit structural representation of an embodiment it is shown, such as Fig. 2 institute with reference to Fig. 2, Fig. 2
Showing, above-mentioned amplifying circuit can include the first amplifying circuit 18 and the second amplifying circuit 19；
The first input end of described first amplifier 18 connects the first resistance 11, and the second input connects foil gauge
The second incoming end, the outfan of the first amplifying circuit 18 connects the second input of the second amplifying circuit 19,
The first input end of the second amplifier 19 and outfan connect zeroing controller 30 respectively.
The micronormal difference signal that the present embodiment utilizes the first amplifying circuit 18 to export Wheatstone bridge successively is carried out
Amplify, make the voltage of input the second amplifying circuit 19 second input send change, cause the second amplifying circuit
The output voltage change of 19, zeroing controller 30 by detection and regulates above-mentioned second amplifying circuit 19 first
The input voltage of input, carries out the zeroing of corresponding foil gauge.
With reference to shown in Fig. 3, Fig. 3 show the foil gauge zeroing circuit structural representation of an embodiment, as
Shown in Fig. 3, in one embodiment, above-mentioned first amplifying circuit can include the first amplifier the 22, the 4th
Resistance the 21, the 5th resistance 23 and the first electric capacity 24；
The inverting input of described first amplifier 22 connects the second access of foil gauge by the 4th resistance 21
End, the in-phase input end of the first amplifier 22 connects the first resistance 11, the anti-phase input of the first amplifier 22
End connects the outfan of the first amplifier 22 respectively by the 5th resistance 23 and the first electric capacity 24.
As it is shown on figure 3, as an embodiment, above-mentioned second amplifying circuit can include the second amplifier 28,
6th resistance the 25, the 7th resistance 27 and the second electric capacity 26；
The inverting input of described second amplifier 28 connects the defeated of the first amplifier 22 by the 6th resistance 25
Going out end, the in-phase input end of the second amplifier 28 and outfan connect zeroing controller 36 respectively, and second amplifies
The inverting input of device 28 connects the second amplifier 28 by the 7th resistance 27 and the second electric capacity 26 respectively
Outfan；
Described zeroing controller 30 detects the output voltage of the second amplifier 28, regulates the second amplifier 28 same
The voltage of phase input, carries out the zeroing of foil gauge.
As it is shown on figure 3, as an embodiment, above-mentioned foil gauge zeroing circuit, it is also possible to include that digital-to-analogue turns
Parallel operation 32, described digital to analog converter 32 is connected to the homophase input of zeroing controller 30 and the second amplifier 28
Between end；
The output signal of zeroing controller 30 is converted to after analogue signal input the by described digital to analog converter 32
The in-phase input end of two amplifiers 28.
The present embodiment utilizes digital to analog converter 32 to be converted to by the associated adjustment signal that zeroing controller 30 exports
Input the in-phase input end of the second amplifier 28 after analogue signal, inputted regulation signal and can be improved
The compatibility of two zeroing controllers 28.
As it is shown on figure 3, as an embodiment, above-mentioned foil gauge zeroing circuit, it is also possible to include that modulus turns
Parallel operation 34, described analog-digital converter 34 be connected to the outfan of the second amplifier 28 and zeroing controller 30 it
Between；
After the output signal of the second amplifier 28 is converted to digital signal by described analog-digital converter 34, input is adjusted
Zero controller 30.
The present embodiment utilizes analog-digital converter 34 that the output signal of the second amplifier 28 is converted to digital signal
Rear input zeroing controller 30, can improve the accuracy of the signal that zeroing controller 30 is read, Jin Erti
The accuracy of high coherent detection.
In one embodiment, above-mentioned zeroing controller can detect the second amplifier output voltage, and performs
Start from scratch and be gradually increased the function of regulation the second amplifier in-phase input end voltage, the second amplification detected
After the output voltage of device is equal to the benchmark quiescent voltage of the second amplifier, keep input to the second amplifier homophase
The voltage of input is constant, and now, above-mentioned foil gauge zeroing circuit is operated in range of strain, and second amplifies
The output voltage Vo of device is VR～VCC, it is possible to achieve the zeroing to the foil gauge accessed.
As an embodiment, above-mentioned foil gauge zeroing circuit is that single supply is powered, according to operational amplifier
Operating characteristic, when operational amplifier anti-phase input terminal voltage is more than or equal to in-phase input end voltage, computing
Amplifier is output as zero, and in the range of this, operational amplifier is not operate at amplification region, therefore single supply supplies
During electricity, the quiescent output voltage of operational amplifier should be disposed greater than zero less than in the range of supply voltage.On
Stating foil gauge when producing strain, foil gauge resistance reduces, and the output voltage V3 of the first amplifier reduces, the
The output voltage Vo of two amplifiers increases.The quiescent output voltage of this second amplifier thus can be set for slightly
Static base voltage VR (0 < VR < VCC) more than zero, then, in range of strain, circuit is output as
VR～VCC.Above-mentioned VCC is the supply voltage of foil gauge zeroing circuit.
Foil gauge static direct current resistance is typically within hundreds of Europe to one kilo-ohm, in actual use, by
In the impact of each side such as production technology, the foil gauge produced even with same batch, one also can be produced
Fixed difference, and the device such as resistance that circuit uses also brings along certain difference, and due to the height of circuit
Gain, can make these differences be amplified to cause whole system normally to work.Can be in zeroing controller
First arranging a benchmark quiescent voltage VR more than zero, Single-chip Controlling digital to analog converter output voltage is opened from zero
Beginning is gradually increased, and Single-chip Controlling analog-digital converter works simultaneously, constantly gathers the defeated of the second amplifier
Go out voltage Vo；When DAC module output voltage reaches V3-0.5VCC-R3/R8, wherein, above-mentioned
V3 is the output voltage of the first amplifier, and VCC is the supply voltage of foil gauge zeroing circuit, and R3 is first
The resistance value of resistance, R8 is the resistance value of the 7th resistance, and symbol "/" represents is divided by, and the second amplifier enters
Normal operating conditions, the output voltage Vo of the second amplifier continues to increase, until the output electricity of the second amplifier
Pressure Vo is equal to said reference quiescent voltage VR；Now single-chip microcomputer is amplified to second by digital to analog converter output
The regulation signal of device in-phase input end keeps constant, and whole foil gauge zeroing circuit is now operated in range of strain
In, the output voltage Vo of the second amplifier is VR～VCC, it is possible to achieve the zeroing to the foil gauge accessed.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the most right
The all possible combination of each technical characteristic in above-described embodiment is all described, but, if these skills
There is not contradiction in the combination of art feature, is all considered to be the scope that this specification is recorded.
Embodiment described above only have expressed several embodiments of the present utility model, its describe more concrete and
In detail, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that, it is right
For those of ordinary skill in the art, without departing from the concept of the premise utility, it is also possible to do
Going out some deformation and improvement, these broadly fall into protection domain of the present utility model.Therefore, this utility model is special
The protection domain of profit should be as the criterion with claims.
Claims (8)
1. a foil gauge zeroing circuit, it is characterised in that include the first resistance, the second resistance, the 3rd electricity
Resistance, amplifying circuit and zeroing controller；
Described first resistance is connected between the first incoming end and the first input end of amplifying circuit of foil gauge,
Second input of described amplifying circuit connects the second incoming end of foil gauge, and the first of described amplifying circuit is defeated
Enter end and pass through the second resistance eutral grounding, described zeroing control by the 3rd resistance eutral grounding, the second incoming end of foil gauge
Device processed connects first input end and the outfan of amplifying circuit respectively；
Described first incoming end and the second incoming end access foil gauge to be returned to zero, amplifying circuit first input end
The first voltage and the second voltage of the second input change, zeroing controller detection amplifying circuit output
The output voltage of end, and regulate the voltage of input amplifying circuit first input end.
Foil gauge zeroing circuit the most according to claim 1, it is characterised in that described zeroing controller
Including single-chip microcomputer.
Foil gauge zeroing circuit the most according to claim 1, it is characterised in that described amplifying circuit bag
Include the first amplifying circuit and the second amplifying circuit；
The first input end of described first amplifier connects the first resistance, and the second input connects the of foil gauge
Two incoming ends, the outfan of the first amplifying circuit connects the second input of the second amplifying circuit, and second amplifies
The first input end of device and outfan connect zeroing controller respectively.
Foil gauge zeroing circuit the most according to claim 3, it is characterised in that described first amplifies electricity
Road includes the first amplifier, the 4th resistance, the 5th resistance and the first electric capacity；
The inverting input of described first amplifier connects the second incoming end of foil gauge by the 4th resistance, the
The in-phase input end of one amplifier connects the first resistance, and the inverting input of the first amplifier is respectively by the 5th
Resistance and the first electric capacity connect the outfan of the first amplifier.
Foil gauge zeroing circuit the most according to claim 4, it is characterised in that described second amplifies electricity
Road includes the second amplifier, the 6th resistance, the 7th resistance and the second electric capacity；
The inverting input of described second amplifier connects the outfan of the first amplifier by the 6th resistance, the
The in-phase input end of two amplifiers and outfan connect zeroing controller, the anti-phase input of the second amplifier respectively
End connects the outfan of the second amplifier respectively by the 7th resistance and the second electric capacity；
Described zeroing controller detects the output voltage of the second amplifier, regulates the second amplifier in-phase input end
Voltage, carry out the zeroing of foil gauge.
Foil gauge zeroing circuit the most according to claim 5, it is characterised in that also include digital-to-analogue conversion
Device, described digital to analog converter is connected to return to zero between controller and the in-phase input end of the second amplifier；
Described digital to analog converter inputs the second amplification after the output signal of zeroing controller is converted to analogue signal
The in-phase input end of device.
Foil gauge zeroing circuit the most according to claim 5, it is characterised in that also include analog digital conversion
Device, described analog-digital converter is connected between the outfan of the second amplifier and zeroing controller；
After the output signal of the second amplifier is converted to digital signal by described analog-digital converter, input zeroing controls
Device.
Foil gauge zeroing circuit the most according to claim 5, it is characterised in that described zeroing controller
Detect the second amplifier output voltage, and perform to start from scratch and be gradually increased regulation the second amplifier homophase input
The function of terminal voltage, is detecting the output voltage benchmark Static Electro equal to the second amplifier of the second amplifier
After pressure, keep input constant to the voltage of the second amplifier in-phase input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620277055.1U CN205537689U (en) | 2016-04-01 | 2016-04-01 | Foil gage zero setting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620277055.1U CN205537689U (en) | 2016-04-01 | 2016-04-01 | Foil gage zero setting circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205537689U true CN205537689U (en) | 2016-08-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620277055.1U Active CN205537689U (en) | 2016-04-01 | 2016-04-01 | Foil gage zero setting circuit |
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| CN (1) | CN205537689U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220537A (en) * | 2019-06-12 | 2019-09-10 | 五邑大学 | A kind of detection circuit applied to piezoresistive transducer |
| CN113551693A (en) * | 2021-07-26 | 2021-10-26 | 联合微电子中心有限责任公司 | Step-by-step self-zero-adjusting detection circuit and method |
-
2016
- 2016-04-01 CN CN201620277055.1U patent/CN205537689U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220537A (en) * | 2019-06-12 | 2019-09-10 | 五邑大学 | A kind of detection circuit applied to piezoresistive transducer |
| CN113551693A (en) * | 2021-07-26 | 2021-10-26 | 联合微电子中心有限责任公司 | Step-by-step self-zero-adjusting detection circuit and method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |