CN207197541U - Measuring circuit and measuring instrument - Google Patents
Measuring circuit and measuring instrument Download PDFInfo
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- CN207197541U CN207197541U CN201721124541.0U CN201721124541U CN207197541U CN 207197541 U CN207197541 U CN 207197541U CN 201721124541 U CN201721124541 U CN 201721124541U CN 207197541 U CN207197541 U CN 207197541U
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- stablizer
- strain
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Abstract
The application provides a kind of measuring circuit and measuring instrument.Wherein, measuring circuit includes two first strain gauges with normal strain coefficient, two the second strain gauge, voltage-stablizer and the reference resistances with negative strain coefficient；Two the first strain gauges and two the second strain gauges form bridge circuit respectively as with respect to bridge arm, and one in bridge circuit is diagonally used as power input, and another is diagonally used as signal output part；The voltage output end of one end connection voltage-stablizer in power input, other end ground connection；One end of reference resistance connects one end in power input and connects the feedback input end of voltage-stablizer, to control the voltage stabilization at resistance both ends.The measuring circuit and measuring instrument provided by the embodiment of the present application, can effectively reduce the influence of environment temperature, improve measurement accuracy, but also can reduce cost with the inner space of effectively save measuring instrument.
Description
Technical field
The application is related to field of measuring technique, more particularly to measuring circuit and measuring instrument.
Background technology
With the development of technology, using bridge circuit (the also referred to as electricity of high-accuracy semiconductor resistor foil gauge composition
Bridge), it is widely used in measuring circuit, there is higher measurement accuracy, higher sensitivity, relatively low power consumption and cost.Bridge-type
Circuit includes two devices and two devices for having normal strain coefficient with negative strain coefficient.Device with negative strain coefficient
Part, reduce with the increase of measurand.Device with normal strain coefficient, increases with the increase of measurand
Add.By two in the bridge circuit devices with negative strain coefficient and two being there is the variable quantity of the device of normal strain coefficient turn
Voltage or the magnitude of current are changed to, for subsequently calculating the size of measurand.
Utility model content
The application provides a kind of measuring circuit and measuring instrument.The influence of environment temperature can be effectively reduced, improves measurement essence
Degree.
A kind of measuring circuit is provided according to the first aspect of the embodiment of the present application, including：Two have normal strain coefficient
First strain gauge, two the second strain gauge, voltage-stablizer and the reference resistances with negative strain coefficient；Described two first strains
Meter and described two second strain gauges form bridge circuit respectively as with respect to bridge arm, and one in the bridge circuit is diagonal
As power input, another is diagonally used as signal output part；One end in the power input connects the voltage-stablizer
Voltage output end, the other end ground connection；One end of the reference resistance connects one end in the power input and connects institute
The feedback input end of voltage-stablizer is stated, to control the voltage stabilization at the resistance both ends.
Further, one end in the power input connects the voltage output end of the voltage-stablizer, and the other end is through institute
Reference resistance ground connection is stated, the ungrounded end of the reference resistance connects the feedback input end of the voltage-stablizer.
Further, one end ground connection in the power input, the other end connect the feedback input end of the voltage-stablizer
And the voltage output end of the voltage-stablizer is connected through the reference resistance.
Further, first strain gauge and second strain gauge have essentially identical original internal resistance.
Further, the absolute value of the variation coefficient of first strain gauge and second strain gauge is essentially identical.
Further, first strain gauge, the second strain gauge are respectively that metallic resistance strain gauge and semiconductor resistor are answered
Become at least one of meter.
Further, first strain gauge, the second strain gauge are semiconductor gas pressure sensor.
Further, the voltage-stablizer is linear voltage regulator or switching regulator.
Further, the voltage-stablizer also includes a control terminal, and the control terminal connects a controller.
A kind of measuring instrument is provided according to the second aspect of the embodiment of the present application, the measuring instrument includes above-mentioned measurement electricity
Road.
The measuring circuit and measuring instrument of the embodiment of the present application, the voltage stabilization at reference resistance both ends is controlled by voltage-stablizer,
The current value for passing through reference resistance is fixed value, i.e. the electric current of bridge circuit is constant.Therefore, the signal of bridge circuit
Voltage between output end is not influenceed by environment temperature, can effectively reduce the influence of environment temperature, improves measurement accuracy.And
And the measuring circuit of the embodiment of the present application only needs to increase a voltage-stablizer, circuit is simple, can not only improve the stabilization of measurement
Property, cost can be reduced with the inner space of effectively save measuring instrument.
It should be appreciated that the general description and following detailed description of the above are only exemplary and explanatory, not
The application can be limited.
Brief description of the drawings
Accompanying drawing herein is merged in specification and forms the part of this specification, shows and meets the application implementation
Example, and for explaining principle of the invention together with specification.
Fig. 1 is the circuit diagram for the measuring circuit that the application is powered using constant pressure source in the prior art；
Fig. 2 is the circuit diagram for the measuring circuit that the application uses constant current source power supply in the prior art；
Fig. 3 is a kind of circuit diagram of measuring circuit shown in the embodiment of the present application；
Fig. 4 is the circuit diagram of another measuring circuit shown in the embodiment of the present application；
Fig. 5 is the circuit diagram of another measuring circuit shown in the embodiment of the present application；
Fig. 6 is a kind of structural representation of measuring instrument shown in the embodiment of the present application.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of the consistent apparatus and method of some aspects be described in detail in claims, the application.
It is only merely for the purpose of description specific embodiment in term used in this application, and is not intended to be limiting the application.
" one kind " of singulative used in the application and appended claims, " described " and "the" are also intended to including majority
Form, unless context clearly shows that other implications.
In the prior art, the measuring circuit being made up of bridge circuit typically has two schemes.
The first scheme：Powered using constant pressure source, its circuit is as shown in fig. 1.Wherein, R11 and R14 is with negative strain
The resistance of coefficient.R12 and R13 is the resistance for having normal strain coefficient.R11, R12, R13, R14 typically use semi-conducting material system
Into because semi-conducting material is temperature sensitive, therefore its resistance is also influenceed by environment temperature.
Assuming that R11, R12, R13, R14 original internal resistance are all equal and are R, when the original internal resistance is zero degrees celsius, do not have
In the case of the nature of external physical amount effect, R11, R12, R13, R14 resistance.The physical quantity to be measured in by external environment condition
During effect, R12 and R13 resistance increase, variable quantity are that △ R, R11 and R14 resistance reduce, and variable quantity is-△ R；In addition by
Influenceed in temperature, R11, R12, R13, R14 resistance there are △ RTVariable quantity.
It can be drawn by the circuit in Fig. 1：
R11=R- △ R+ △ RT
R12=R+ △ R+ △ RT
R13=R+ △ R+ △ RT
R14=R- △ R+ △ RT
According to Fig. 1, the output V of electric bridgeout=UAB, R11, R12, R13, R14 are substituted into formula, obtained
Therefore, powered using constant pressure source, the internal resistance of the high-accuracy semiconductor resistor strain device due to forming bridge circuit
Change with the change of environment temperature, and be nonlinear with the variation relation of environment temperature so that measurement result is by temperature
Have a great influence, do not reach higher measurement accuracy.
Second scheme：It is as shown in Figure 2 using constant current source power supply, its circuit.Wherein, R21 and R24 is with negative strain system
Several resistance, R22 and R23 are the resistance for having normal strain coefficient.
It is similarly assumed that R21, R22, R23, R24 original internal resistance are all equal and are R, when the original internal resistance is zero degrees celsius,
In the case of there is no the nature that external physical amount acts on, R21, R22, R23, R24 resistance.The thing to be measured in by external environment condition
When reason amount acts on, R22 and R23 resistance increase, variable quantity are that △ R, R21 and R24 resistance reduce, and variable quantity is-△ R；Separately
Outside because temperature influences, R21, R22, R23, R24 resistance is set there are △ RTVariable quantity.
R25, Q2, U2 form constant-current source circuit, and Vref connects constant pressure source, and its magnitude of voltage is to immobilize, then current value I=
Vref/R25 is invariable, and current value I is unrelated with R21, R22, R23, R24, is not influenceed by variation of ambient temperature.
It can be drawn by the circuit in Fig. 2：
R21=R- △ R+ △ RT
R22=R+ △ R+ △ RT
R23=R+ △ R+ △ RT
R24=R- △ R+ △ RT
Therefore RCAD=RCBD=R21+R23=R22+R24=2* (R+ △ RT), therefore the electric current for flowing through R23 and R24 is identical
IR23=IR24=ICAD=ICBD=I/2
According to Fig. 2, the output V of electric bridgeout=UAB, then
Constant current source power supply is used, although it is possible to prevente effectively from the influence of output of the environment temperature to electric bridge.But the program
Constant-current source circuit it is more complicated, it is necessary to use operational amplifier and FET or triode, it is also necessary to a stable constant pressure source
Constant voltage is produced, cost is higher.And because temperature drift in itself be present in operational amplifier, and output offset voltage etc. because
The influence of element, the output current value of constant-current source is caused not ensure that whenever all unanimously, so as to cause measuring system inadequate
It is stable.In addition, multiple circuit devcie decentralized designs take the more inner space of measuring apparatus, it is unfavorable for saving measuring apparatus
Inner space, also it is unfavorable for the lightening design of product.
Based on this, the embodiment of the present application provides the measuring circuit after a kind of improvement and the measurement comprising the measuring circuit
Instrument.
Below in conjunction with the accompanying drawings, measuring circuit of the present utility model and measuring instrument are described in detail.In the feelings not conflicted
Under condition, the feature in following embodiment and embodiment can be mutually combined.
As shown in figure 3, Fig. 3 is a kind of circuit diagram of measuring circuit 100 of the exemplary embodiment of the application one.The measurement
Circuit 100 may include two first strain gauge R32 and R33 with normal strain coefficient, two there is negative strain coefficient second
Strain gauge R31 and R34, voltage-stablizer U and reference resistance R5.
Two the first strain gauge R32 and R33 and two second strain gauge R31 and R34 are formed respectively as with respect to bridge arm
Bridge circuit (also referred to as electric bridge).Such as：First strain gauge R32 and the second strain gauge R34 are connected in series, the first strain gauge R33
Be connected in series with the second strain gauge R31, then both be connected in parallel again, so as to by two have normal strain coefficient strain gauges with
And two strain gauges with negative strain coefficient form bridge circuit respectively as with respect to bridge arm.It should be noted that this reality
Can be respectively that multiple strain gauge units are in parallel and/or series connection is formed with the first strain gauge R32 and R33 in new embodiment
Strain gauge with normal strain coefficient.Second strain gauge R31 and R34 also can be respectively multiple strain gauge units parallel connections and/or string
Join the strain gauge with negative strain coefficient formed.
With reference to figure 3, one diagonal (such as C-terminal and D ends) in bridge circuit is used as power input, another diagonal (such as A
End and B ends) it is used as signal output part；The voltage output end V of one end C connection voltage-stablizers U in power inputout, power input
Other end D in end is grounded by reference to resistance R5；Reference resistance R5 ungrounded end connection voltage-stablizer U feedback input end
FB, to control the voltage stabilization at reference resistance R5 both ends.
In the embodiment of the present application, because the first strain gauge R32 and R33 has a normal strain coefficient, the second strain gauge R31 and
R34 has negative strain coefficient.So when measurand increase, R32 and R33 resistance with the increase of measurand and
Increase, and R31 and R34 resistance increases and reduced with measurand.By the way that R31, R32, R33 and R34 variable quantity are turned
The voltage of the signal output part (such as side a and b) of bridge circuit is changed to, for the follow-up size for calculating measurand.
In the present embodiment, the first strain gauge R32 and R33, the second strain gauge R31 and R34 type can select as needed.
In some instances, the first strain gauge R32 and R33, the second strain gauge R31 and R34 are respectively metallic resistance strain gauge and partly led
At least one of bulk resistor strain gauge.Specifically, the first strain gauge R32 and R33, the second strain gauge R31 and R34 can be
Semiconductor gas pressure sensor, in this case, the measuring circuit 100 of the embodiment of the present application can be used for barometric surveying.Pass through voltage stabilizing
The constant-current source that device U and reference resistance R5 is formed is powered to semiconductor baroceptor R31~R34, can effectively avoid ring
The non-linear effects that border temperature change is brought to bridge circuit output.Certain the present embodiment not limited to this, specifically can basis
Actual conditions choose the type of the first strain gauge and the second strain gauge.
In an optional embodiment, the first strain gauge R32 and R33 and the second strain gauge R31 and R34 can have substantially
The original internal resistance of identical.When the original internal resistance is zero degrees celsius, in the case of the nature of external physical amount effect, R31, R32,
R33, R34 resistance.So, in measurand increase, it is easy to calculate first strain gauge R32, R33 and the second strain gauge
R31, R34 variable quantity.The original internal resistance that R31, R32, R33, R34 can be set in the present embodiment is R.
In an optional embodiment, the first strain gauge R32 and R33 and the second strain gauge R31 and R34 variation coefficient
Absolute value is essentially identical.So, in measurand increase, first strain gauge R32, R33 and second strain gauge R31, R34's
Variable quantity is also essentially identical, such as, when physical quantity effect to be measured in by external environment condition, the first strain gauge R32's and R33
Resistance increase, variable quantity are △ R, and the second strain gauge R31 and R34 resistance reduces, and variable quantity is-△ R；Additionally, due to ring
Border temperature influences, and makes R31, R32, R33, R34 resistance have △ RTVariable quantity.The change gauge being so easy to more than
Calculate the voltage U of the signal output part (such as side a and b) of bridge circuitout, and then calculate the size of measurand.
In an optional embodiment, voltage-stablizer U can be linear voltage regulator or switching regulator.With reference to figure 3, voltage stabilizing
Device U VinEnd connection voltage source Vcc；GND ends are earth terminal, VoutFor voltage output end, FB is feedback input end.As voltage-stablizer U
During normal work, by feedback input end FB to voltage output end VoutOutput voltage be adjusted so that reference resistance R5 two
The voltage stabilization at end, that is, the voltages of feedback input end FB over the ground are caused to remain VFB.Wherein, VFBFor fixed voltage value, the value takes
Certainly in voltage-stablizer U model.
Because voltage-stablizer U feedback input end FB internal resistance is very big, therefore the electric current I at feedback input end FB endsFBIt is much smaller than
Total current I, and varied less in the range of its operating temperature ratings, therefore can be by IFBIgnore, i.e. total current I=IR5
=VFB/ R5 is fixed value.
It can be drawn by the circuit in Fig. 3：
R31=R- △ R+ △ RT
R32=R+ △ R+ △ RT
R33=R+ △ R+ △ RT
R34=R- △ R+ △ RT
Therefore RCAD=RCBD=R31+R33=R32+R34=2* (R+ △ RT), therefore flow through R33 and R34 electric current phase
Together, i.e. IR33=IR34=ICAD=ICBD=I/2, therefore the bridge circuit is constant current-supplying.Current value I and R31, R32, R33,
R34 is unrelated, is not influenceed by variation of ambient temperature.
According to Fig. 3, the voltage U of the signal output part of electric bridgeout=UAB。
It follows that the present embodiment uses constant current source power supply, influence of the environment temperature to measurement result can be avoided.
It should be noted that in the embodiment of the present application, the first strain gauge R32 and R33 and the second strain gauge R31 and R34
Can have different original internal resistances and different variation coefficient absolute values, not limited in the embodiment of the present application.
Fig. 4 is the circuit diagram of another measuring circuit 100 of the exemplary embodiment of the application one.
With reference to figure 4, one end D in power input is grounded, and other end C connection voltage-stablizers U feedback input end FB is simultaneously passed through
Reference resistance R5 connection voltage-stablizers U voltage output end Vout.In the present embodiment, R31, R32, R33, R34 equally be assume that
Original internal resistance it is all equal and be R, with the change of measurand, caused variable quantity is the first strain gauge R32 and R33
Caused variable quantity is-△ R with the change of measurand by △ R, the second strain gauge R31 and R34；Additionally, due to environment temperature
Influence, make R31, R32, R33, R34 resistance there are △ RTVariable quantity.Due to when voltage-stablizer U normal works, passing through feedback
Input FB is to voltage output end VoutOutput voltage be adjusted so that the voltage stabilization at reference resistance R5 both ends, i.e. electric current
I=IR5=VFB/ R5 is fixed value.
From the circuit in Fig. 4：
R31=R- △ R+ △ RT
R32=R+ △ R+ △ RT
R33=R+ △ R+ △ RT
R34=R- △ R+ △ RT
Therefore RCAD=RCBD=R31+R33=R32+R34=2* (R+ △ RT), therefore flow through R33 and R34 electric current phase
Together, i.e. IR33=IR34=ICAD=ICBD=I/2, therefore the bridge circuit is constant current-supplying.Current value I and R31, R32, R33,
R34 is unrelated, is not influenceed by variation of ambient temperature.
According to Fig. 4, the voltage U of the signal output part of electric bridgeout=UAB。
It follows that the present embodiment uses constant current source power supply, influence of the environment temperature to measurement result can be avoided.
The measuring circuit 100 of the embodiment of the present application, the voltage stabilization at reference resistance R5 both ends is controlled by voltage-stablizer U, is made
The current value that reference resistance R5 must be flowed through is fixed value, i.e. the electric current of bridge circuit is constant.Therefore, the signal of bridge circuit
Voltage between output end is not influenceed by environment temperature, you can effectively to reduce the influence of environment temperature, improves measurement accuracy.
Moreover, the measuring circuit 100 of the embodiment of the present application only needs to increase a voltage-stablizer, circuit is simple, can not only improve measurement
Stability, cost can be reduced with the inner space of effectively save measuring instrument.
Fig. 5 is the circuit diagram of another measuring circuit 100 of the exemplary embodiment of the application one.As shown in figure 5, as entering
One-step optimization, voltage-stablizer U also include a control terminal CE, and control terminal CE is connected to a controller C.Controller C can pass through control
Whether end CE controls measuring circuit 100 works, such as when control terminal CE signal is high level, measuring circuit 100 normal work
Make, when control terminal CE signal is low level, measuring circuit 100 is stopped, can be with the energy of effectively save measuring circuit 100
Consumption.
In an optional embodiment, between the power input of measuring circuit 100 can with shunt capacitance C3, wherein,
Electric capacity C3 can be made up of one or more electric capacity.With continued reference to Fig. 5, electric capacity C3 one end connects the C-terminal of power input,
Electric capacity C3 other end ground connection, so, can improve the stability of the work of measuring circuit 100, reduce circuit noise, lifting measurement
Precision.
The embodiment of the present application additionally provides a kind of measuring instrument 200, and measuring instrument 200 includes the survey that above-mentioned diagram is implemented to exemplify
Measure circuit 100.In an alternative embodiment, with reference to figure 6, measuring instrument 200 can also include controller C, for controlling measuring instrument
200 enter normal mode of operation or low-power consumption mode.For example measuring instrument 200 is when being in normal operating condition, controller C controls
Voltage-stablizer U processed control terminal CE signal is high level, the normal work of measuring circuit 100, and measuring instrument 200 is in normal work mould
Formula.And measuring instrument 200 is in open state, but when not detecting measurand change more than preset duration, controller C
When controlling voltage-stablizer U control terminal CE signal to be low level, measuring circuit 100 is stopped, and measuring instrument 200 is in low-power consumption
Pattern.So can be with the energy consumption of effectively save measuring instrument 200.
The preferred embodiment of the application is the foregoing is only, not limiting the application, all essences in the application
God any modification, equivalent substitution and improvements done etc., should be included within the scope of the application protection with principle.
Claims (10)
- A kind of 1. measuring circuit, it is characterised in that including：Two first strain gauges with normal strain coefficient, two with negative The second strain gauge, voltage-stablizer and the reference resistance of the coefficient of strain；Described two first strain gauges and described two second strain gauges form bridge circuit respectively as with respect to bridge arm, described One in bridge circuit is diagonally used as power input, and another is diagonally used as signal output part；One end in the power input connects the voltage output end of the voltage-stablizer, other end ground connection；The reference resistance One end connect one end in the power input and connect the feedback input end of the voltage-stablizer, it is described with reference to electricity to control Hinder the voltage stabilization at both ends.
- 2. measuring circuit according to claim 1, it is characterised in that one end connection in the power input is described steady The voltage output end of depressor, the other end are grounded through the reference resistance, and the ungrounded end of the reference resistance connects the voltage stabilizing The feedback input end of device.
- 3. measuring circuit according to claim 1, it is characterised in that one end ground connection in the power input is another End connects the feedback input end of the voltage-stablizer and the voltage output end of the voltage-stablizer is connected through the reference resistance.
- 4. measuring circuit according to claim 1, it is characterised in that first strain gauge and second strain gauge tool There is essentially identical original internal resistance.
- 5. measuring circuit according to claim 1, it is characterised in that first strain gauge and second strain gauge The absolute value of variation coefficient is essentially identical.
- 6. according to the measuring circuit described in any one of claim 1 to 5, it is characterised in that first strain gauge, the second strain Meter is respectively at least one of metallic resistance strain gauge and semiconductor resistor strain gauge.
- 7. measuring circuit according to claim 6, it is characterised in that first strain gauge, the second strain gauge are half Conductor baroceptor.
- 8. measuring circuit according to claim 1, it is characterised in that the voltage-stablizer is linear voltage regulator or switch voltage-stabilizing Device.
- 9. measuring circuit according to claim 1, it is characterised in that the voltage-stablizer also includes a control terminal, the control End processed connects a controller.
- 10. a kind of measuring instrument, it is characterised in that including the measuring circuit any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124541.0U CN207197541U (en) | 2017-09-04 | 2017-09-04 | Measuring circuit and measuring instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721124541.0U CN207197541U (en) | 2017-09-04 | 2017-09-04 | Measuring circuit and measuring instrument |
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| CN207197541U true CN207197541U (en) | 2018-04-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280837A (en) * | 2021-03-29 | 2021-08-20 | 国网电力科学研究院有限公司 | Circuit and method for improving sensitivity of differential resistance type sensor |
-
2017
- 2017-09-04 CN CN201721124541.0U patent/CN207197541U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113280837A (en) * | 2021-03-29 | 2021-08-20 | 国网电力科学研究院有限公司 | Circuit and method for improving sensitivity of differential resistance type sensor |
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