CN110006585A - A kind of data acquisition device and method of pressure sensor - Google Patents
A kind of data acquisition device and method of pressure sensor Download PDFInfo
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- CN110006585A CN110006585A CN201910370923.9A CN201910370923A CN110006585A CN 110006585 A CN110006585 A CN 110006585A CN 201910370923 A CN201910370923 A CN 201910370923A CN 110006585 A CN110006585 A CN 110006585A
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- voltage
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- pressure
- pressure sensor
- reference voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/083—Means for indicating or recording, e.g. for remote indication electrical
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/26—Pc applications
- G05B2219/2612—Data acquisition interface
Abstract
The purpose of the application is to provide the data acquisition device and method of a kind of pressure sensor, the acquisition device of the application includes power supply, microprocessor, D/A converting circuit, constant-current source circuit, pressure sensor and analog to digital conversion circuit, pass through the acquisition device, the burning voltage reference signal for determining the D/A converting circuit output, as reference voltage；The voltage of collection point after obtaining conversion in analog-digital conversion circuit as described, wherein the collection point is the common connecting point of the pressure sensor, the constant-current source circuit and analog-digital conversion circuit as described；The current pressure value of the pressure sensor is determined according to the voltage of the collection point after the reference voltage, the conversion and supply voltage.So that pressure sensor is able to maintain in a metastable range in the voltage of the output signal under different pressures section, accuracy of data acquisition with higher.
Description
Technical field
This application involves art of pressure sensors more particularly to the data acquisition devices and method of a kind of pressure sensor.
Background technique
Sensor technology and the communication technology, computer technology constitute three big pillars of modern information industry.Wherein, sensor
Technology is the bottleneck industry that a relative communication technology and computer technology fall behind.Traditional sensors are because of function, characteristic, volume etc.
Be difficult to meet the present computer technology, the communication technology to precision, reliability, weatherability, information processing capability etc. require and gradually
It is eliminated.Diaphragm pressure sensor is the development with thin film technique and the novel pressure sensing of a kind of function admirable that is born
Device uses high-accuracy and printing technology, has the good characteristics such as precision is high, operating temperature range is wide, stability is good.And for
The data of thin film sensor acquire, and generally use a set of preset parameter circuit at present and remove driving thin film sensor, export result model
It is larger to enclose variation range, precision is caused to be not easy to be consistent, the design of rear class Acquisition Circuit is also complex.
Summary of the invention
The purpose of the application is to provide the data acquisition device and method of a kind of pressure sensor, solves the prior art
Output range of results when the data acquisition of middle diaphragm pressure sensor changes greatly, precision is not easy to be consistent, Acquisition Circuit
Design is complicated, calculates complicated problem.
According to the one aspect of the application, a kind of data acquisition device of pressure sensor is provided, comprising:
Power supply；
Microprocessor, the microprocessor are connect with the power supply；
D/A converting circuit, the D/A converting circuit are connected with the microprocessor and the power supply respectively；
Constant-current source circuit, the constant-current source circuit are connected with the D/A converting circuit and the power supply respectively；
Pressure sensor, the pressure sensor are connected with the constant-current source circuit and the power supply respectively；
Analog to digital conversion circuit, analog-digital conversion circuit as described respectively with the pressure sensor, the microprocessor and described
Power supply is connected.
Further, the D/A converting circuit includes digital analog converter and filter circuit, the digital analog converter and institute
Filter circuit connection is stated, the filter circuit is connect with the constant-current source circuit.
Further, the filter circuit includes first resistor and first capacitor, the first resistor respectively with the number
Mode converter and the first capacitor are connected, one end ground connection of the first capacitor.
Further, the constant-current source circuit includes:
Operational amplifier, the operational amplifier are connect with the filter circuit；
Field-effect tube, the field-effect tube are connected with the operational amplifier and the pressure sensor respectively；
Sampling resistor, the sampling resistor are connect with the field-effect tube, sampling resistor one end ground connection；
Negative-feedback circuit, negative-feedback circuit are connected with the operational amplifier and the sampling resistor respectively.
Further, the negative-feedback circuit includes second resistance and 3rd resistor, the second resistance and the third
Resistance connection, second resistance one end ground connection.
On the other hand according to the application, a kind of collecting method of pressure sensor is additionally provided, aforementioned institute is used
The data acquisition device stated, which comprises
The burning voltage reference signal for determining the D/A converting circuit output, as reference voltage；
The voltage of collection point after obtaining conversion in analog-digital conversion circuit as described, wherein the collection point is the pressure
The common connecting point of force snesor, the constant-current source circuit and analog-digital conversion circuit as described；
The pressure sensor is determined according to the voltage of the collection point after the reference voltage, the conversion and supply voltage
Current pressure value.
Further, it is determined that the burning voltage reference signal of the D/A converting circuit output, as reference voltage, packet
It includes:
The burning voltage reference signal that digital analog converter exports in the D/A converting circuit is determined, by the burning voltage
Reference signal is used as reference voltage after carrying out High frequency filter by the filter circuit.
Further, according to the voltage of the collection point after the reference voltage, the conversion and supply voltage determination
The current pressure value of pressure sensor, comprising:
The pressure sensor is determined according to the voltage of the collection point after the reference voltage, the conversion and supply voltage
Corresponding resistance value；
The pressure sensing is determined according to the corresponding resistance value of the pressure sensor and preset pressure resistance value corresponding relationship
The current pressure value of device.
Further, according to the voltage of the collection point after the reference voltage, the conversion and supply voltage determination
The corresponding resistance value of pressure sensor, comprising:
Determine that the resistance value is corresponding according to the corresponding resistance value of the pressure sensor and preset pressure resistance value corresponding relationship
Pressure where block information；
The reference voltage is adjusted to the corresponding benchmark of the block information by the block information where the pressure
Voltage determines reference voltage adjusted；
The voltage of collection point after reacquiring conversion in analog-digital conversion circuit as described, with the flat of the determination collection point
Equal voltage；
The pressure is determined according to the reference voltage adjusted, the average voltage of the collection point and the supply voltage
The corresponding resistance value of force snesor.
Further, the block information where the pressure includes first interval, second interval and 3rd interval, and described
One section corresponds to the corresponding second preset reference voltage of the first preset reference voltage, the second interval, and the 3rd interval is corresponding
Third preset reference voltage.
Further, the reference voltage is adjusted to by the block information pair according to the block information where the pressure
The reference voltage answered, comprising:
It is corresponding default that the reference voltage is adjusted to the block information by block information where the pressure
Reference voltage, wherein the preset reference voltage include the first preset reference voltage, the second preset reference voltage and
The third preset reference voltage.
Compared with prior art, the application is provided a kind of data acquisition device of pressure sensor and is filled using the acquisition
The method for carrying out data acquisition is set, which includes power supply；Microprocessor, the microprocessor are connect with the power supply；
D/A converting circuit, the D/A converting circuit are connected with the microprocessor and the power supply respectively；Constant-current source circuit, institute
Constant-current source circuit is stated to be connected with the D/A converting circuit and the power supply respectively；Pressure sensing, the pressure sensor point
It is not connected with the constant-current source circuit and the power supply；Analog to digital conversion circuit, analog-digital conversion circuit as described respectively with the pressure
Force snesor, the microprocessor and the power supply are connected.Further, using above-mentioned acquisition device, the digital-to-analogue is determined
The burning voltage reference signal of conversion circuit output, as reference voltage；After obtaining conversion in analog-digital conversion circuit as described
The voltage of collection point, wherein the collection point is the pressure sensor, the constant-current source circuit and analog-digital conversion circuit as described
Common connecting point；The pressure is determined according to the voltage of the collection point after the reference voltage, the conversion and supply voltage
The current pressure value of sensor.So that the voltage of output signal of the diaphragm pressure sensor under different pressures section is able to maintain
In a metastable range, entire surveying range can be kept to have higher measurement accuracy, and make measured value
It is linear relationship with calculated result, facilitates calculating.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
The structure that Fig. 1 shows a kind of data acquisition device of the pressure sensor provided according to the one aspect of the application is shown
It is intended to；
Fig. 2 shows the resistance value of diaphragm pressure sensor in one embodiment of the application and the variation relation schematic diagrames of pressure；
Fig. 3 shows the circuit diagram of the acquisition device of pressure sensor in one embodiment of the application；
Fig. 4 shows the circuit diagram of the acquisition device of another pressure sensor in one embodiment of the application；
Fig. 5 shows a kind of collecting method process signal of the pressure sensor provided on the other hand according to the application
Figure；
Fig. 6 shows the pressure of the pressure sensor in one embodiment of the application after demarcation interval and the curved line relation of resistance value
Figure；
Fig. 7 shows the flow diagram that pressure value is determined in one embodiment of the application.
The same or similar appended drawing reference represents the same or similar component in attached drawing.
Specific embodiment
The application is described in further detail with reference to the accompanying drawing.
The structure that Fig. 1 shows a kind of data acquisition device of the pressure sensor provided according to the one aspect of the application is shown
It is intended to, including power supply 1；Microprocessor 2, the microprocessor 2 are connect with the power supply 1；D/A converting circuit 3, the digital-to-analogue
Conversion circuit 3 is connected with the microprocessor 2 and the power supply 1 respectively；Constant-current source circuit 4, the constant-current source circuit 4 are distinguished
It is connected with the D/A converting circuit 3 and the power supply 1；Pressure sensing 5, the pressure sensor 5 respectively with the constant current
Source circuit 4 and the power supply 1 are connected；Analog to digital conversion circuit 6, analog-digital conversion circuit as described 6 respectively with the pressure sensor
5, the microprocessor 2 and the power supply 1 are connected.
Here, the microprocessor 2 exports burning voltage reference signal for controlling the D/A converting circuit 3, to make
For benchmark voltage；The constant-current source circuit 4 is used to pass through the pressure sensor 5 based on burning voltage reference signal control
Electric current it is constant；Analog-digital conversion circuit as described 6 is for converting the voltage of collection point, by the voltage of the collection point after conversion
It exports to the microprocessor 2, wherein the collection point is the pressure sensor 5, the constant-current source circuit 4 and the mould
The common connecting point of number conversion circuit 6；The power supply 1 and the microprocessor 2, D/A converter module 3, constant-current source circuit 4, pressure
Force snesor 5 and analog-to-digital conversion module 6 connect, for providing supply voltage；The microprocessor 2 according to the reference voltage,
The voltage of collection point after the conversion and the supply voltage determine the current pressure value of the pressure sensor.Here, pressure
Force snesor 5 is diaphragm pressure sensor, is in the nature a variable resistance, with the difference of external pressure, resistance value can be generated
Variation, change in resistance trend as shown in Fig. 2, within the scope of certain pressure, with its change in resistance range of the variation of pressure compared with
Greatly, after reaching certain pressure, change in resistance range is smaller.As shown in Figure 2, diaphragm pressure sensor change in resistance range it is larger and
Resistance value curve is nonlinear, if removing driving thin film sensor using the parametric circuit of a set of fixation, can to export result model
It is very big to enclose variation range, also, in the biggish section of pressure, change in resistance is smaller, then required precision is increased in this way, so
The curve of variation will increase the design requirement difficulty of rear class data acquisition circuit.Therefore adjustable driving diaphragm pressure is needed to pass
The circuit of sensor, so that the voltage of output signal of the diaphragm pressure sensor under different pressures section is able to maintain at one relatively surely
In fixed range, to guarantee the precision of data acquisition.
In one embodiment of the application, the D/A converting circuit 3 includes digital analog converter 31 and filter circuit 32, described
Digital analog converter 31 is connect with the filter circuit 32, and the filter circuit 32 is connect with the constant-current source circuit 4.Here, micro-
Processor 2 is micro-control unit (MCU), and D/A converting circuit 3 includes digital analog converter DAC, and analog to digital conversion circuit 6 turns for modulus
Parallel operation ADC.Wherein, MCU exports stable voltage reference signal for controlling digital analog converter DAC circuit, passes through constant-current source electricity
The voltage reference signal is stablized on road, guarantees that the electric current for passing through pressure sensor 5 in the case where voltage reference signal is constant is constant,
MCU reads the output voltage of pressure sensor 5 by analog-digital converter ADC, that is, reads the voltage of collection point, and the voltage of reading is
Voltage after ADC is converted, the voltage by the collection point read electric power output voltage, reference voltage and MCU are true
The current pressure of level pressure force snesor.The filter circuit 32 is used for the burning voltage benchmark for exporting the digital analog converter 31
After signal carries out High frequency filter, it is transmitted to the constant-current source circuit 4.Here, MCU control digital analog converter adc circuit output is steady
After fixed voltage reference signal, after filtering the high frequency spurs in signal by filter circuit 32, the constant-current source circuit of rear class is transported to
With the benchmark of burning voltage, wherein the characteristics of cutoff frequency point of filter network can according to need the signal of measurement is set
It is fixed.
In one embodiment of the application, the filter circuit 32 includes first resistor R1 and first capacitor C1, and described first
Resistance R1 is connected with the digital analog converter 31 and the first capacitor C1 respectively, one end ground connection of the first capacitor C1,
RC filter network is constituted by R1, C1.
In one embodiment of the application, the constant-current source circuit 4 includes operational amplifier 41, the operational amplifier 41 with
The filter circuit 32 connects；Field-effect tube 42, the field-effect tube 42 respectively with the operational amplifier 41 and the pressure
Sensor 5 is connected；Sampling resistor 43, the sampling resistor 43 are connect with the field-effect tube 42, the sampling resistor 43 1
End ground connection；Negative-feedback circuit 44, negative-feedback circuit 44 are connected with the operational amplifier 41 and the sampling resistor 43 respectively.
Here, constant-current source circuit 4 includes operational amplification circuit U2, field-effect tube Q1, negative-feedback circuit and sampling resistor R5；The operation
The non-inverting input terminal of amplifying circuit U2 is connect with the first resistor R1 and the first capacitor C1, the operational amplification circuit U2
Inverting input terminal connect with the negative-feedback circuit, the output end of the operational amplification circuit U2 and the field-effect tube Q1's
Grid connection；The source electrode of the field-effect tube Q1 is connect with the sampling resistor R5, the drain electrode of the field-effect tube Q1 with it is described
Pressure sensor 5 connects.The negative-feedback circuit includes second resistance R2 and 3rd resistor R3, and the negative-feedback circuit includes the
Two resistance R2 and 3rd resistor R3, the second resistance R2 are connect with the 3rd resistor R3, and the second resistance R2 mono- is terminated
Ground.Here, one end of the second resistance R2 is grounded, one end and the operational amplification circuit U2 of the other end and 3rd resistor R3
Inverting input terminal connection, the source electrode and the sampling resistor R5 of the other end of the 3rd resistor R3 and the field-effect tube Q1
Connection.Physical circuit frame diagram is as shown in Figure 3:
MCU is connect with digital analog converter DAC, exports stable voltage reference signal, digital-to-analogue to control digital analog converter DAC
Converter DAC is connect with the filter network being made of first resistor R1 and first capacitor C1, wherein first capacitor C1 ground connection, the
One resistance R1 is connect with the common node of first capacitor C1 with the non-inverting input terminal of operational amplifier U2, the inverting input terminal of U2 with
The negative feedback network connection being made of second resistance R2 and 3rd resistor R3, wherein second resistance R2 ground connection, 3rd resistor R3
It is connect with sampling resistor R5, the output end of U2 is connect after the 4th resistance R4 with the grid of N-channel field-effect tube Q1, the source of Q1
Pole is connect with sampling resistor R5 and 3rd resistor R3, the drain electrode of Q1 and diaphragm pressure sensor U1 and analog-digital converter ADC
Connection, ADC connect with MCU, are transmitted in MCU after the voltage of A point is converted, constant-current source circuit is transported by low-noise accurate
Calculate amplifier U2, N-channel field-effect tube Q1, negative feedback network R2, R3 of operational amplifier U2 and for sampling adopting for current limliting
Sample resistance R5 is constituted, and thereby may be ensured that permanent by the electric current Is of pressure sensor U1 in the case where voltage reference signal is constant
It is fixed.Wherein, A point is collection point, and the voltage Vout of A point is the signal for needing to acquire.To circuit by above-mentioned design, acquisition
Determine that diaphragm pressure sensor is worked as to the voltage of collection point, and then according to collected voltage and supply voltage, reference voltage
Preceding pressure value, the data acquisition device of pressure sensor described in above-described embodiment, adjustable diaphragm pressure sensor
Voltage circuit so that the voltage value of output signal of the diaphragm pressure sensor under different pressures section is able to maintain in a phase
To in stable range, guarantee the precision of data acquisition.
It does not include negative-feedback circuit, circuit structure exemplary diagram in the constant-current source circuit in the another embodiment of the application
As shown in figure 4, MCU is microprocessor, for carrying out operation to data, DAC and ADC is controlled；DAC is digital analog converter, by MCU
The digital signal conversion provided exports corresponding voltage signal Vdac；ADC is analog-digital converter, is read by ADC and MCU
The voltage value Vout of A point；R1, C1 constitute RC filter, for filtering out the clutter after DAC is exported, adjust R1 according to the actual situation
With the value of C1, if the stability of DAC output voltage can satisfy circuit requirement, R1 and C1 can be deleted.R4 is protective resistance,
For shielding to Q1, can also delete.Q1 is N-channel field-effect tube, can also use NPN type triode generation certainly
It replaces.Arithmetic unit U2 and Q1, R3 and R5 constitute constant current amplifying circuit, and it is constant by the electric current Is of sensor U1 to can control stream,
Current value Is=Vdac/R5.It should be noted that the regulating power range of circuit is 0- in Fig. 4 according to Q1 characteristic
1200uA.When being given in Table 1 the value of different R5, the part corresponding data of Vdac and Is.
Table 1
Fig. 5 shows a kind of collecting method process signal of the pressure sensor provided on the other hand according to the application
Figure, uses the aforementioned data acquisition device, which comprises step S11~step S13,
In step s 11, the burning voltage reference signal for determining the D/A converting circuit output, as reference voltage；
In step s 12, the voltage of the collection point after obtaining conversion in analog-digital conversion circuit as described, wherein the collection point is institute
State the common connecting point of pressure sensor, the constant-current source circuit and analog-digital conversion circuit as described；In step s 13, according to institute
The voltage and supply voltage of collection point after stating reference voltage, the conversion determine the current pressure value of the pressure sensor.
Here, the burning voltage reference signal of D/A converting circuit output is denoted as Vdac as reference voltage, MCU is read in ADC
The voltage of collection point be denoted as Vout, Is is denoted as by the electric current of pressure sensor, the resistance value of pressure sensor is Rs, power supply electricity
Pressure output voltage is VCC, then the voltage for the collection point that MCU is read and the resistance value corresponding relationship of pressure sensor are as follows: Vout
=VCC-Is*Rs, wherein Is is steady state value in the case where reference voltage is constant, with digital analog converter DAC output Vdac in solid
Determine relationship, is denoted as formula (one): Is=f (Vdac), further, in step s 13, according to the reference voltage, described turn
The voltage and supply voltage of collection point after changing determine the corresponding resistance value of the pressure sensor；According to the pressure sensor pair
The resistance value and preset pressure resistance value corresponding relationship answered determine the current pressure value of the pressure sensor.Here, according to acquisition
The voltage and the resistance value corresponding relationship and Is of pressure sensor and the relationship of Vdac of point obtain: Rs=(VCC-Vout)/f
(Vdac), show that Rs and Vout are in a linear relationship by the relationship, to be conducive to later period progress data point using linear relationship
Analysis.The current pressure of pressure sensor can be obtained according to the corresponding relationship of resistance value and pressure in the resistance value of available pressure sensor
Force value.
In one embodiment of the application, in step s 11, it may be determined that digital analog converter exports in the D/A converting circuit
Burning voltage reference signal, by the burning voltage reference signal by the filter circuit carry out High frequency filter after be used as base
Quasi- voltage.Here, the voltage reference signal of digital analog converter output is filtered by the RC being made of first resistor and first capacitor
Wave circuit filters the high frequency spurs in signal, using filtered reference voltage signal as the base for being used to adjust pressure sensor
Quasi- voltage.
In one embodiment of the application, the pressure of the pressure sensor after demarcation interval as shown in FIG. 6 and the song of resistance value
Line relational graph, the block information where the pressure include first interval, second interval and 3rd interval, the first interval pair
The corresponding second preset reference voltage of the first preset reference voltage, the second interval is answered, it is default that the 3rd interval corresponds to third
Reference voltage.
In one example of the application, when Is is fixed value, under same pressure variety, Vout is in first interval
(K1) regional change range is larger, and arrives the variation range very little of 3rd interval (K3), to will lead in entire pressure area
Interior measurement accuracy is different, therefore, by acquisition device described herein and method, adjustable Is, such as in the region K1
It suitably turns Is down and suitably tunes up Is in the region K3, so that the Vout that the same pressure variety in different pressures section is measured
Variable quantity be also consistent.Wherein, need to guarantee the acquisition range and ADC of the voltage of sampled point in different intervals control Is
Sampling interval it is consistent.According to actual circuit, the value of K1, K2 and K3 corresponding Vdac1, Vdac2, Vdac3 are measured in advance
With the approximation Vdac0 for being suitble to entire section, with facilitate ADC read Vout.It is first when being determined the pressure value of pressure sensor
The interval range where pressure value can be first prejudged, and then carries out accurate measurement place again by adjusting corresponding reference voltage
Block information, and then corresponding pressure value is calculated, so that the pressure value finally obtained is more accurate.Specifically implementation
Are as follows:
It, can be according to the corresponding resistance value of the pressure sensor and default when determining the corresponding resistance value of the pressure sensor
Pressure resistance value corresponding relationship determine the block information where the corresponding pressure of the resistance value；Section where the pressure
The reference voltage is adjusted to the corresponding reference voltage of the block information by information, determines reference voltage adjusted；From institute
The voltage that the collection point after conversion is reacquired in analog to digital conversion circuit is stated, with the average voltage of the determination collection point；According to
The reference voltage adjusted, the average voltage of the collection point and the supply voltage determine that the pressure sensor is corresponding
Resistance value.It specifically, can be according to the block information where the pressure by the reference voltage when being adjusted reference voltage
It is adjusted to the corresponding preset reference voltage of the block information, wherein the preset reference voltage includes the described first default base
Quasi- voltage, the second preset reference voltage and the third preset reference voltage.
Here, the voltage reference Vdac0 that setting DAC is exported, reads the value of ADC, and then according to output supply voltage, acquisition
The voltage and reference voltage Vdac0 of point judge that pressure falls in the block information of K1-K3, and then according to the block information judged
Corresponding adjustment DAC output voltage is to corresponding Vdac, for example falls in the section K1, then the output voltage of DAC is adjusted to the section K1
Corresponding Vdac1 after adjustment, re-reads the value of ADC, further according to the value of the ADC of the one or many readings in front, asks Vout's
Average value, according to formula (two): Rs=(VCC-Vout)/f (Vdac) determines the corresponding resistance value of the pressure sensor, wherein
Vdac is reference voltage when last time adjusts, and Vout is the average value for repeatedly reading the voltage of the collection point in ADC and determining.
And then obtained pressure resistance value pair is tested according to the curve graph of the corresponding relationship of the pressure value and resistance value of sensor or inquiry in advance
Table is answered to obtain Rs corresponding pressure value.Entire surveying range can be kept to have higher measurement accuracy by adjusting Vdac, with
And measured value and calculated result is made to be linear relationship, facilitate calculating.
In one specific embodiment of the application, according to the characteristic curve of the pressure of sensor and resistance value, if can be divided into
A dry section carries out curve fitting, and has been partitioned into 3 sections as shown in Figure 6, and each section is intended using thicker straightway
Curve is closed, so that calculating be facilitated not bring too big error again.The slope in each section is defined as K1, K2 and K3, then corresponds to
Resistance value Rs and pressure N between relationship be formula (three): pressure N=-Kn*Rs+L, wherein Kn indicate K1, K2, K3, be quasi-
The slope of zygonema section；L is coefficient constant.By formula (two) and formula (three) it can be concluded that formula (four):
N=-Kn* (VCC-Vout)/Is+L；According to the formula, by Vout value in Acquisition Circuit figure, according to sensor spy
Linearity curve can calculate pressure value N.By three regions of differentiation, realizes line acquisition data, reduce the calculating of processor
Complexity.
By formula (four) and formula (one), formula (five) can be obtained:
N=-Kn* (VCC-Vout)/(Vdac/R5)+L；It can directly be counted according to the Vout value that ADC is read from formula (five)
Calculate pressure N.
Specific embodiment are as follows: three matching line segments (as shown in Figure 6) are partitioned into the characteristic curve of pressure sensor, often
Line segment is described by formula (three), and three matching line segments respectively include K1, K2, K3 and L1, six constants of L2, L3,
And there is A, these constants are preset in the program of microprocessor by resistance value the constant Ra and Rb of two endpoints of B.According to formula
(2) a reasonable Is is set, so that the measurement result Vout of ADC is distributed in the entire of ADC in the section of entire line segment
In measuring range, a certain head for concentrating on range is avoided, so as to obtain higher measurement accuracy.After setting Is, according to
Formula (one), obtains three line segments corresponding Vdac1, Vdac2, Vdac3, the Vdac1 that will be obtained, Vdac2, and Vdac3 is preset at
In the program of microprocessor.During actual measurement, to judge which section is pressure fall in, it can carry out in the following manner
Determine: as shown in fig. 7, attempting to set different K1, K2 and K3 one by one, i.e. DAC provides corresponding Vdac1, Vdac2,
Vdac3 calculates whether Rs falls in corresponding section according to measurement result, if it is not, then continue to replace different sections, if so,
It re-starts repeatedly measurement to average to reduce error, obtains measurement result.
By above-mentioned circuit structure and the acquisition method of use, entire surveying range can be kept by adjusting Vdac
There is higher measurement accuracy, and measured value and calculated result are linear relationship, facilitate calculating.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the application to the application
Mind and range.In this way, if these modifications and variations of the application belong to the range of the claim of this application and its equivalent technologies
Within, then the application is also intended to include these modifications and variations.
It should be noted that the application can be carried out in the assembly of software and/or software and hardware, for example, can adopt
With specific integrated circuit (ASIC), general purpose computer or any other realized similar to hardware device.In one embodiment
In, the software program of the application can be executed to implement the above steps or functions by processor.Similarly, the application
Software program (including relevant data structure) can be stored in computer readable recording medium, for example, RAM memory,
Magnetic or optical driver or floppy disc and similar devices.In addition, hardware can be used to realize in some steps or function of the application, example
Such as, as the circuit cooperated with processor thereby executing each step or function.
In addition, a part of the application can be applied to computer program product, such as computer program instructions, when its quilt
When computer executes, by the operation of the computer, it can call or provide according to the present processes and/or technical solution.
And the program instruction of the present processes is called, it is possibly stored in fixed or moveable recording medium, and/or pass through
Broadcast or the data flow in other signal-bearing mediums and transmitted, and/or be stored according to described program instruction operation
In the working storage of computer equipment.Here, including a device according to one embodiment of the application, which includes using
Memory in storage computer program instructions and processor for executing program instructions, wherein when the computer program refers to
When enabling by processor execution, method and/or skill of the device operation based on aforementioned multiple embodiments according to the application are triggered
Art scheme.
It is obvious to a person skilled in the art that the application is not limited to the details of above-mentioned exemplary embodiment, Er Qie
In the case where without departing substantially from spirit herein or essential characteristic, the application can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and scope of the present application is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included in the application.Any reference signs in the claims should not be construed as limiting the involved claims.This
Outside, it is clear that one word of " comprising " does not exclude other units or steps, and odd number is not excluded for plural number.
Claims (11)
1. a kind of data acquisition device of pressure sensor, comprising:
Power supply；
Microprocessor, the microprocessor are connect with the power supply；
D/A converting circuit, the D/A converting circuit are connected with the microprocessor and the power supply respectively；
Constant-current source circuit, the constant-current source circuit are connected with the D/A converting circuit and the power supply respectively；
Pressure sensor, the pressure sensor are connected with the constant-current source circuit and the power supply respectively；
Analog to digital conversion circuit, analog-digital conversion circuit as described respectively with the pressure sensor, the microprocessor and the power supply
It is connected.
2. data acquisition device according to claim 1, which is characterized in that the D/A converting circuit includes digital-to-analogue conversion
Device and filter circuit, the digital analog converter are connect with the filter circuit, and the filter circuit and the constant-current source circuit connect
It connects.
3. data acquisition device according to claim 2, which is characterized in that the filter circuit includes first resistor and
One capacitor, the first resistor are connected with the digital analog converter and the first capacitor respectively, and the one of the first capacitor
End ground connection.
4. data acquisition device according to claim 3, which is characterized in that the constant-current source circuit includes:
Operational amplifier, the operational amplifier are connect with the filter circuit；
Field-effect tube, the field-effect tube are connected with the operational amplifier and the pressure sensor respectively；
Sampling resistor, the sampling resistor are connect with the field-effect tube, sampling resistor one end ground connection；
Negative-feedback circuit, negative-feedback circuit are connected with the operational amplifier and the sampling resistor respectively.
5. data acquisition device according to claim 4, which is characterized in that the negative-feedback circuit include second resistance and
3rd resistor, the second resistance are connect with the 3rd resistor, second resistance one end ground connection.
6. a kind of collecting method of pressure sensor, wherein use the data as described in any one of claims 1 to 5
Acquisition device, which comprises
The burning voltage reference signal for determining the D/A converting circuit output, as reference voltage；
The voltage of collection point after obtaining conversion in analog-digital conversion circuit as described, wherein the collection point is pressure biography
The common connecting point of sensor, the constant-current source circuit and analog-digital conversion circuit as described；
Determine that the pressure sensor is current according to the voltage of the collection point after the reference voltage, the conversion and supply voltage
Pressure value.
7. according to the method described in claim 6, wherein it is determined that the burning voltage benchmark letter of D/A converting circuit output
Number, as reference voltage, comprising:
The burning voltage reference signal that digital analog converter exports in the D/A converting circuit is determined, by the burning voltage benchmark
Signal is used as reference voltage after carrying out High frequency filter by the filter circuit.
8. according to the method described in claim 6, wherein, according to the voltage of the collection point after the reference voltage, the conversion
And supply voltage determines the current pressure value of the pressure sensor, comprising:
Determine that the pressure sensor is corresponding according to the voltage of the collection point after the reference voltage, the conversion and supply voltage
Resistance value；
Determine that the pressure sensor is worked as according to the corresponding resistance value of the pressure sensor and preset pressure resistance value corresponding relationship
Preceding pressure value.
9. according to the method described in claim 8, wherein, according to the voltage of the collection point after the reference voltage, the conversion
And supply voltage determines the corresponding resistance value of the pressure sensor, comprising:
The corresponding pressure of the resistance value is determined according to the corresponding resistance value of the pressure sensor and preset pressure resistance value corresponding relationship
Block information where power；
The reference voltage is adjusted to the corresponding reference voltage of the block information by the block information where the pressure,
Determine reference voltage adjusted；
The voltage of collection point after reacquiring conversion in analog-digital conversion circuit as described, with the average electricity of the determination collection point
Pressure；
Determine that the pressure passes according to the reference voltage adjusted, the average voltage of the collection point and the supply voltage
The corresponding resistance value of sensor.
10. according to the method described in claim 9, wherein, the block information where the pressure includes first interval, the secondth area
Between and 3rd interval, the corresponding second preset reference electricity of the corresponding first preset reference voltage of the first interval, the second interval
Pressure, the 3rd interval correspond to third preset reference voltage.
11. according to the method described in claim 10, wherein, block information where the pressure is by the reference voltage
It is adjusted to the corresponding reference voltage of the block information, comprising:
The reference voltage is adjusted to the corresponding preset reference of the block information by the block information where the pressure
Voltage, wherein the preset reference voltage includes the first preset reference voltage, the second preset reference voltage and described
Third preset reference voltage.
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