CN106840470A - A kind of bridge type pressure sensor output signal harvester and method - Google Patents
A kind of bridge type pressure sensor output signal harvester and method Download PDFInfo
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- CN106840470A CN106840470A CN201710044113.5A CN201710044113A CN106840470A CN 106840470 A CN106840470 A CN 106840470A CN 201710044113 A CN201710044113 A CN 201710044113A CN 106840470 A CN106840470 A CN 106840470A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/52—One-way transmission networks, i.e. unilines
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The present invention relates to a kind of bridge type pressure sensor output signal harvester and acquisition method, harvester includes the low-pass filtering module, differential amplification module, analog-to-digital conversion module and the microprocessor that are sequentially connected；Also include the power module being connected with described low-pass filtering module, differential amplification module, analog-to-digital conversion module and microprocessor respectively.The present invention is used for bridge type pressure sensor output signal accurate acquisition, and compared with prior art, acquisition precision is high, up to 0.1%；The linearity is high, up to 0.1%；And can effectively suppress the interference of more than 40Hz.
Description
Technical field
The present invention relates to Signal Collection Technology field, more particularly to a kind of bridge type pressure sensor output signal collection dress
Put and method.
Background technology
Bridge type pressure sensor is worked as due to the design that the stability of its voltage signal is widely used in pressure sensor
In, but because the voltage signal that this kind of mode is exported is several millivolts even small-signal of several millivolts of zero point, it is desirable to precise acquisition
This kind of signal has very big difficulty.Existing acquisition system is typically made up of frontend amplifying circuit and analog to digital conversion circuit, past
Toward the variation tendency that can only gather output signal, but acquisition precision and the linearity are all relatively poor, and signal easily receives surrounding ring
The interference of border noise.
The content of the invention
In view of above-mentioned analysis, the present invention is intended to provide a kind of bridge type pressure sensor output signal harvester and side
Method, is used to solve low prior art signal pickup assembly acquisition precision, poor linearity, the technology of environment interference difference and asks
Topic.
The purpose of the present invention is mainly achieved through the following technical solutions：
A kind of bridge type pressure sensor output signal harvester, including low-pass filtering module, the difference being sequentially connected
Amplification module, analog-to-digital conversion module and microprocessor；Also include respectively with described low-pass filtering module, differential amplification module,
Analog-to-digital conversion module and the power module of microprocessor connection；
The low-pass filtering module is used to carry out LPF to the differential signal of bridge type pressure sensor output
Treatment, filtered differential signal is input to the differential input end of differential amplification module；
After the differential amplification module is amplified treatment to the differential signal being input into, by the signal input after amplification to mould
Number modular converter；
The analog-to-digital conversion module carries out analog-to-digital conversion to the signal being input into, and the data signal after conversion is sent into micro- place
Reason device；
After the microprocessor carries out mean filter treatment to received data signal, divided by differential amplification module
Multiplication factor obtains the raw value of bridge type pressure sensor output signal；
Supply voltage of the power module for needed for above-mentioned each module is provided.
Further, the low-pass filtering module is arranged in pairs, and number is 2N；Accordingly, the differential amplification module
Number is N；Wherein N is natural number, and span is 1~4.
Further, the low-pass filtering module includes an OPA301, the 2nd OPA301, R1~R4 and 8 electricity of 4 resistance
Hold C1~C8；
1 pin of the first OPA301 directly connects with 4 pin, and 2 pin ground connection, 3 pin are sequentially connected with resistance R2, R1 as input
End, 3 pin are also grounded by electric capacity C7, and one end of electric capacity C1 is connected with 1 pin of an OPA301, and the other end of electric capacity C1 connects
It is connected between resistance R1, R2, R3, R4 that 4 pin pass through to be sequentially connected with are connected with 3 pin of the 2nd OPA301；
1 pin of the 2nd OPA301 directly connects as output end with 4 pin, and 2 pin ground connection, 3 pin are also connect by electric capacity C8
Ground, one end of electric capacity C2 is connected with 1 pin of the 2nd OPA301, and the another of electric capacity C2 is terminated between resistance R3, R4；
5 pin of the first OPA301 connect+5V power supplys, between+5V the power supplys and ground of an OPA301 shunt capacitance C3,
C4；5 pin of the 2nd OPA301 connect+5V power supplys, shunt capacitance C5, C6 between the+5V power supplys and ground of the 2nd OPA301.
Further, using two grades of amplifications, every grade of multiplication factor is 10 times to the differential amplification module.
Further, the differential amplification module includes an INA333, the 2nd INA333, R5~R8 and 5 electricity of 4 resistance
Hold C9~C13；
Resistance R7 is connected between 1 pin and 8 pin of the first INA333, as bearing that the first order is amplified after 2 pin connection resistance R5
Differential input end, the positive differential input amplified as the first order after 3 pin connection resistance R6, electric capacity is connected between 2 pin and 3 pin
C9,4 pin are grounded by electric capacity C12, and 5 pin are directly grounded, the input that 6 pin amplify as the output end that the first order is amplified with the second level
End connection, 7 pin are grounded by electric capacity C10；
Resistance R8,2 pin ground connection, the input that 3 pin amplify as the second level, 4 are connected between 1 pin and 8 pin of the 2nd INA333
Pin is grounded by electric capacity C13, and 5 pin are directly grounded, and the output end that 6 pin amplify as the second level of differential amplification module, 7 pin pass through
Electric capacity C11 is grounded；
7 pin of the first INA333,7 pin of the 2nd INA333 connect+2.5V power supplys, 4 pin, second of an INA333
4 pin of INA333 connect -2.5V power supplys.
Further, the analog-to-digital conversion module includes chip ADS1254E, R9~R20 and 22 electric capacity C14 of 12 resistance
~C35；
1~6,19~20 pin of the chip ADS1254E align negative input pin IN1+, IN1-, IN2 respectively as four
+, IN2-, IN3+, IN3-, IN4+, IN4-, 7 pin are grounded by electric capacity C34, while 7 pin connect+5V voltages；9 pin pass through electric capacity C35
Ground connection, while 9 pin connect+3.3V voltages, 12 pin ground connection；17 pin are grounded；Multichannel input signal is after analog-to-digital conversion in chip
Under the 14 foot control systems of ADS1254E, exported to microprocessor by 13 pin of chip ADS1254E；
The output end of the one termination first via differential amplification module of resistance R9, another termination IN1+, IN1+ are by electricity in parallel
Hold C14, C15 ground connection；Resistance R10 one end is grounded, and another termination IN1-, IN1- are grounded by shunt capacitance C16, C17；In IN1
+, be parallel with electric capacity C18, resistance R11 between IN1-；
The output end of the one second road differential amplification module of termination of resistance R12, another termination IN2+, IN2+ are by electricity in parallel
Hold C19, C20 ground connection；Resistance R13 one end is grounded, and another termination IN2-, IN2- are grounded by shunt capacitance C21, C22；In IN2
+, be parallel with electric capacity C23, resistance R14 between IN2-；
The output end of the one termination three-pass DINSAR amplification module of resistance R15, another termination IN3+, IN3+ are by electricity in parallel
Hold C24, C25 ground connection；Resistance R16 one end is grounded, and another termination IN2-, IN3- are grounded by shunt capacitance C26, C27；In IN3
+, be parallel with electric capacity C28, resistance R17 between IN3-；
The output end of one the 4th road differential amplification module of termination of resistance R18, another termination IN4+, IN4+ are by electricity in parallel
Hold C29, C30 ground connection；Resistance R19 one end is grounded, and another termination IN4-, IN4- are grounded by shunt capacitance C31, C32；In IN2
+, be parallel with electric capacity C33, resistance R20 between IN2-.
Using the acquisition method of above-mentioned harvester, comprise the following steps：
(1) LPF is carried out to the differential signal that bridge type pressure sensor is exported using described low-pass filtering module
Treatment, filters the interference signal of more than 40Hz, and give differential amplification module by filtered differential signal transmission；
(2) the differential amplification module described in carries out two grades of Linear Amplifers, every grade of multiplication factor to filtered differential signal
It is 10, described differential amplification module sends the signal amplified after 100 times to analog-to-digital conversion module；
(3) analog-to-digital conversion module carries out analog-to-digital conversion to amplifying the signal after 100 times, and will be turned by spi bus
Data signal after changing is sent to microprocessor；
(4) after the microprocessor described in carries out mean filter treatment to the data signal for obtaining, divided by the multiple for amplifying
100, obtain the raw value of bridge type pressure sensor output signal.
The present invention has the beneficial effect that：
Bridge type pressure sensor output signal harvester and its method, for bridge type pressure sensor output signal
Accurate acquisition, compared with prior art,
1st, acquisition precision is high, up to 0.1%；
2nd, the linearity is high, up to 0.1%；
3rd, the interference of more than 40Hz can effectively be suppressed.
Other features and advantages of the present invention will be illustrated in the following description, also, the partial change from specification
Obtain it is clear that or being understood by implementing the present invention.The purpose of the present invention and other advantages can be by the explanations write
Specifically noted structure is realized and obtained in book, claims and accompanying drawing.
Brief description of the drawings
Accompanying drawing is only used for showing the purpose of specific embodiment, and is not considered as limitation of the present invention, in whole accompanying drawing
In, identical reference symbol represents identical part.
Fig. 1 is embodiment of the present invention overall structure block diagram；
Fig. 2 is embodiment of the present invention low-pass filtering module schematic diagram；
Fig. 3 is embodiment of the present invention differential amplification module diagram；
Fig. 4 is embodiment of the present invention analog-to-digital conversion module schematic diagram.
Specific embodiment
The preferred embodiments of the present invention are specifically described below in conjunction with the accompanying drawings, wherein, accompanying drawing constitutes the application part, and
It is used to explain principle of the invention together with embodiments of the present invention.
The differential signal of the road bridge type pressure sensor output of harvester Ke Dui shown in the present embodiment tetra- is accurately adopted
Collection, as shown in figure 1, including power module, low-pass filtering module 1+, low-pass filtering module 1-, low-pass filtering module 2+, low pass filtered
Ripple module 2-, low-pass filtering module 3+, low-pass filtering module 3-, low-pass filtering module 4+, low-pass filtering module 4-, differential amplification
Module 1, differential amplification module 2, differential amplification module 3, differential amplification module 4, analog-to-digital conversion module and microprocessor.
Four pairs of differential signals of four road bridge type pressure sensors outputs are separately input into the defeated of the four pairs of low-pass filtering modules
Enter end；Low-pass filtering module 1+, low-pass filtering module 1- signal output part respectively with the positive and negative difference of differential amplification module 1
Input connection, the signal output part of low-pass filtering module 2+ and low-pass filtering module 2- and the positive and negative difference of differential amplification module 2
Divide input connection, the signal output part of low-pass filtering module 3+ and low-pass filtering module 3- is positive and negative with differential amplification module 3
Differential input end is connected；The signal output part of low-pass filtering module 4+ and low-pass filtering module 4- and differential amplification module 4 just,
Negative differential input end connection.
Differential amplification module 1, differential amplification module 2, differential amplification module 3, the signal output part of differential amplification module 4 with
The signal input part connection of analog-to-digital conversion module；Described analog-to-digital conversion module output end passes through SPI (Serial Peripheral Interface (SPI)s
Serial Peripheral Interface) bus is connected with microprocessor.
Power module and low-pass filtering module 1+, low-pass filtering module 1-, low-pass filtering module 2+, low-pass filtering module
2-, low-pass filtering module 3+, low-pass filtering module 3-, low-pass filtering module 4+, low-pass filtering module 4-, differential amplification module 1,
The supply port of differential amplification module 2, differential amplification module 3, differential amplification module 4, analog-to-digital conversion module and microprocessor
Connection.
The accurate acquisition to bridge type pressure sensor output signal, acquisition method can be realized using above-mentioned harvester
Comprise the following steps：
(1) low-pass filtering module 1+ and low-pass filtering module 1- carries out the differential signal that first via sensor is exported respectively
Low-pass filtering treatment, is then transferred to the positive and negative phase differential input end of differential amplification module 1；Low-pass filtering module 2+ and low pass
The differential signal of No. second sensor output is carried out low-pass filtering treatment by filtration module 2- respectively, is then transferred to differential amplification
The positive and negative phase differential input end of module 2；The difference that low-pass filtering module 3+ and low-pass filtering module 3- export three-way sensor
Sub-signal carries out low-pass filtering treatment respectively, is then transferred to the positive and negative phase differential input end of differential amplification module 3；Low pass filtered
The differential signal of No. fourth sensor output is carried out low-pass filtering treatment by ripple module 4+ and low-pass filtering module 4- respectively, then
Send the positive and negative phase differential input end of differential amplification module 4 to；
(2) differential amplification module 1, differential amplification module 2, differential amplification module 3 and differential amplification module 4 are respectively by difference
The linearly of input input amplifies 100 times, and is sent to the input of analog-to-digital conversion module；
(2) signal that analog-to-digital conversion module will be gathered is converted to data signal and is sent to microprocessor by spi bus
Device；
(4) after microprocessor carries out mean filter treatment, divided by the multiple 100 for amplifying, primary signal numerical value is obtained.
8 low-pass filtering module structures of the present embodiment are identical, and concrete structure is as shown in Fig. 2 including an OPA301, second
OPA301, R1~R4 and 8 electric capacity C1~C8 of 4 resistance；1 pin of the first OPA301 directly connects with 4 pin, 2 pin ground connection,
3 pin are sequentially connected with resistance R2, R1 as input, and 3 pin are also grounded by electric capacity C7, one end of electric capacity C1 and described first
The 1 pin connection of OPA301, the other end of electric capacity C1 is connected between resistance R1, R2, and 4 pin pass through R3, R4 and the institute being sequentially connected with
State the 3 pin connection of the 2nd OPA301；1 pin of the 2nd OPA301 directly connects as output end with 4 pin, 2 pin ground connection, 3 pin
Also it is grounded by electric capacity C8, one end of electric capacity C2 is connected with 1 pin of the 2nd OPA301, and the another of electric capacity C2 terminates at resistance
Between R3, R4；5 pin of the first OPA301 connect+5V power supplys, the shunt capacitance between the+5V power supplys and ground of an OPA301
C3、C4；5 pin of the 2nd OPA301 connect+5V power supplys, between+5V the power supplys and ground of the 2nd OPA301 shunt capacitance C5,
C6。
The resistance of resistance R1~R4 is followed successively by 3.09k Ω, 4.22k Ω, 1.07k Ω, 1.96k Ω；The electricity of electric capacity C1~C8
Capacitance is followed successively by 1.2 μ f, 7.5 μ f, 10 μ f, 0.1 μ f, 10 μ f, 0.1 μ f, 1 μ f, 1 μ f.
The design of the low-pass filtering module effectively filters out the interference of more than 40Hz, eliminates artefact effect.
4 differential amplification modular structures of the present embodiment are identical, and concrete structure is as shown in figure 3, using two instrument amplifiers
INA333 constitutes two-stage structure for amplifying, and every grade is amplified 10 times, and 100 times are amplified altogether.
Differential amplification module includes an INA333, the 2nd INA333, R5~R8 and 5 electric capacity C9~C13 of 4 resistance；
Resistance R7, the negative differential input end that 2 pin connection resistance R5 amplifies as the first order, 3 are connected between 1 pin and 8 pin of the first INA333
The positive differential input that pin connection resistance R6 amplifies as the first order, connects electric capacity C9 between 2 pin and 3 pin, 4 pin pass through electric capacity C12
Ground connection, 5 pin are directly grounded, and 6 pin are connected as the input that the output end that the first order is amplified is amplified with the second level, and 7 pin are by electricity
Hold C10 ground connection；Resistance R8 is connected between 1 pin and 8 pin of the 2nd INA333,2 pin are grounded, the input that 3 pin amplify as the second level,
4 pin are grounded by electric capacity C13, and 5 pin are directly grounded, and the output end that 6 pin amplify as the second level of differential amplification module, 7 pin lead to
Cross electric capacity C11 ground connection；7 pin of the first INA333,7 pin of the 2nd INA333 connect+2.5V power supplys, the 4 of an INA333
Pin, 4 pin of the 2nd INA333 connect -2.5V power supplys.
The resistance of resistance R5~R8 is followed successively by 5.23k Ω, 5.23k Ω, 100 Ω, 100 Ω；The capacitance of electric capacity C9~C13
It is 0.1 μ f.
The differential amplification module high precision, with input impedance higher, sensor output signal can be efficiently extracted
And accurately amplify.
Analog-to-digital conversion module structure, as shown in figure 4, being the resistance R9 of 1k Ω including chip ADS1254E, 12 resistance values
~R20,22 electric capacity C14~C35.
1~6, the 19~20 of chip ADS1254E align negative input pin IN1+, IN1-, IN2+, IN2-, IN3 as four
+, IN3-, IN4+, IN4-, four align negative input pin peripheral circuit all same；7 pin are grounded by electric capacity C34, at the same 7 pin connect+
5V voltages；9 pin are grounded by electric capacity C35, while 9 pin connect+3.3V voltages, 12 pin ground connection；17 pin are grounded；Multichannel input signal is passed through
After analog-to-digital conversion under the control of chip ADS1254E14 pin, exported to microprocessor by 13 pin of chip ADS1254E.
The output end of the one termination first via differential amplification module of resistance R9, another termination IN1+ is in parallel between IN1+ and ground
There are electric capacity C14, C15；Resistance R10 one end is grounded, and another termination IN1- is parallel with electric capacity C16, C17 between IN1- and ground；In IN1
+, be parallel with electric capacity C18, resistance R11 between IN1-.
The output end of the one second road differential amplification module of termination of resistance R12, another termination IN2+ is in parallel between IN2+ and ground
There are electric capacity C19, C20；Resistance R13 one end is grounded, and another termination IN2- is parallel with electric capacity C21, C22 between IN2- and ground；In IN2
+, be parallel with electric capacity C23, resistance R14 between IN2-.
The output end of the one termination three-pass DINSAR amplification module of resistance R15, another termination IN3+ is in parallel between IN3+ and ground
There are electric capacity C24, C25；Resistance R16 one end is grounded, and another termination IN2- is parallel with electric capacity C26, C27 between IN3- and ground；In IN3
+, be parallel with electric capacity C28, resistance R17 between IN3-.
The output end of one the 4th road differential amplification module of termination of resistance R18, another termination IN4+ is in parallel between IN4+ and ground
There are electric capacity C29, C30；Resistance R19 one end is grounded, and another termination IN4- is parallel with electric capacity C31, C32 between IN4- and ground；In IN2
+, be parallel with electric capacity C33, resistance R20 between IN2-.
The analog-to-digital conversion module of the present embodiment design is changed in high precision, quick and precisely；It carries fixed frequency trap function；
The design of chip periphery circuit can realize filter function, effectively suppress the interference of outside noise, and effective to common-mode signal
Inhibitory action.
The invention has the advantages that：
Accurate acquisition is carried out to bridge type pressure sensor output signal, the interference of more than 40Hz, collection essence is effectively filtered out
The degree up to 0.1%, linearity is up to 0.1%.
It will be understood by those skilled in the art that all or part of flow of above-described embodiment method is realized, can be by meter
Calculation machine program is completed to instruct the hardware of correlation, and described program can be stored in computer-readable recording medium.Wherein, institute
It is disk, CD, read-only memory or random access memory etc. to state computer-readable recording medium.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.
Claims (7)
1. a kind of bridge type pressure sensor output signal harvester, it is characterised in that：Including the LPF being sequentially connected
Module, differential amplification module, analog-to-digital conversion module and microprocessor；Also include respectively with described low-pass filtering module, difference
The power module of amplification module, analog-to-digital conversion module and microprocessor connection；
The low-pass filtering module is used to carry out low-pass filtering treatment to the differential signal of bridge type pressure sensor output,
Filtered differential signal is input to the differential input end of differential amplification module；
After the differential amplification module is amplified treatment to the differential signal being input into, the signal input after amplification to modulus is turned
Mold changing block；
The analog-to-digital conversion module carries out analog-to-digital conversion to the signal being input into, and the data signal after conversion is sent into microprocessor
Device；
After the microprocessor carries out mean filter treatment to received data signal, divided by the amplification of differential amplification module
Multiple obtains the raw value of bridge type pressure sensor output signal；
Supply voltage of the power module for needed for above-mentioned each module is provided.
2. bridge type pressure sensor output signal harvester according to claim 1, it is characterised in that：The low pass
Filtration module is arranged in pairs, and differential signal of each pair low-pass filtering module respectively to the output of sensor all the way carries out LPF,
Low-pass filtering module logarithm is N；Accordingly, the differential amplification number of modules is N；Wherein N is natural number.
3. bridge type pressure sensor output signal harvester according to claim 1 and 2, it is characterised in that：It is described
Low-pass filtering module includes an OPA301, the 2nd OPA301, R1~R4 and 8 electric capacity C1~C8 of 4 resistance；
1 pin of the first OPA301 directly connects with 4 pin, and 2 pin ground connection, 3 pin are sequentially connected with resistance R2, R1 as input, and 3
Pin is also grounded by electric capacity C7, and one end of electric capacity C1 is connected with 1 pin of an OPA301, and the other end of electric capacity C1 is connected to
Between resistance R1, R2, R3, R4 that 4 pin pass through to be sequentially connected with are connected with 3 pin of the 2nd OPA301；
1 pin of the 2nd OPA301 directly connects as output end with 4 pin, and 2 pin ground connection, 3 pin are also grounded by electric capacity C8, electricity
The one end for holding C2 is connected with 1 pin of the 2nd OPA301, and the another of electric capacity C2 is terminated between resistance R3, R4；
5 pin of the first OPA301 connect+5V power supplys, shunt capacitance C3, C4 between the+5V power supplys and ground of an OPA301；
5 pin of the 2nd OPA301 connect+5V power supplys, shunt capacitance C5, C6 between the+5V power supplys and ground of the 2nd OPA301.
4. bridge type pressure sensor output signal harvester according to claim 1, it is characterised in that：The difference
Using two grades of amplifications, every grade of multiplication factor is 10 times to amplification module.
5. the bridge type pressure sensor output signal harvester according to claim 1 or 4, it is characterised in that：It is described
Differential amplification module includes an INA333, the 2nd INA333, R5~R8 and 5 electric capacity C9~C13 of 4 resistance；
Resistance R7, the minus tolerance point amplified as the first order after 2 pin connection resistance R5 are connected between 1 pin and 8 pin of the first INA333
Input, the positive differential input amplified as the first order after 3 pin connection resistance R6, connects electric capacity C9,4 pin between 2 pin and 3 pin
It is grounded by electric capacity C12,5 pin are directly grounded, 6 pin connect as the first order output end amplified and the input that the second level is amplified
Connect, 7 pin are grounded by electric capacity C10；
Resistance R8 is connected between 1 pin and 8 pin of the 2nd INA333,2 pin ground connection, the input that 3 pin amplify as the second level, 4 pin lead to
Electric capacity C13 ground connection is crossed, 5 pin are directly grounded, the output end that 6 pin amplify as the second level of differential amplification module, 7 pin pass through electric capacity
C11 is grounded；
7 pin of the first INA333,7 pin of the 2nd INA333 connect+2.5V power supplys, 4 pin, second of an INA333
4 pin of INA333 connect -2.5V power supplys.
6. bridge type pressure sensor output signal harvester according to claim 1, it is characterised in that：The modulus
Modular converter includes chip ADS1254E, R9~R20 and 22 electric capacity C14~C35 of 12 resistance；
1~6,19~20 pin of the chip ADS1254E respectively as four align negative input pin IN1+, IN1-, IN2+,
IN2-, IN3+, IN3-, IN4+, IN4-, 7 pin are grounded by electric capacity C34, while 7 pin connect+5V voltages；9 pin are connect by electric capacity C35
Ground, while 9 pin connect+3.3V voltages, 12 pin ground connection；17 pin are grounded；Multichannel input signal is after analog-to-digital conversion in chip
Under the 14 foot control systems of ADS1254E, exported to microprocessor by 13 pin of chip ADS1254E；
The output end of the one termination first via differential amplification module of resistance R9, another termination IN1+, IN1+ passes through shunt capacitance
C14, C15 are grounded；Resistance R10 one end is grounded, and another termination IN1-, IN1- are grounded by shunt capacitance C16, C17；IN1+,
Electric capacity C18, resistance R11 are parallel between IN1-；
The output end of the one second road differential amplification module of termination of resistance R12, another termination IN2+, IN2+ passes through shunt capacitance
C19, C20 are grounded；Resistance R13 one end is grounded, and another termination IN2-, IN2- are grounded by shunt capacitance C21, C22；IN2+,
Electric capacity C23, resistance R14 are parallel between IN2-；
The output end of the one termination three-pass DINSAR amplification module of resistance R15, another termination IN3+, IN3+ passes through shunt capacitance
C24, C25 are grounded；Resistance R16 one end is grounded, and another termination IN2-, IN3- are grounded by shunt capacitance C26, C27；IN3+,
Electric capacity C28, resistance R17 are parallel between IN3-；
The output end of one the 4th road differential amplification module of termination of resistance R18, another termination IN4+, IN4+ passes through shunt capacitance
C29, C30 are grounded；Resistance R19 one end is grounded, and another termination IN4-, IN4- are grounded by shunt capacitance C31, C32；IN2+,
Electric capacity C33, resistance R20 are parallel between IN2-.
7. the acquisition method of one of a kind of use claim 1-6 harvesters, it is characterised in that：Comprise the following steps：
(1) low-pass filtering treatment is carried out to the differential signal that bridge type pressure sensor is exported using the low-pass filtering module,
The interference signal of more than 40Hz is filtered, and differential amplification module is given by filtered differential signal transmission；
(2) the differential amplification module described in carries out two grades of Linear Amplifers to filtered differential signal, and every grade of multiplication factor is 10,
Described differential amplification module sends the signal amplified after 100 times to analog-to-digital conversion module；
(3) analog-to-digital conversion module carries out analog-to-digital conversion to amplifying the signal after 100 times, and after spi bus will be changed
Data signal be sent to microprocessor；
(4) after the microprocessor described in carries out mean filter treatment to the data signal for obtaining, divided by the multiple 100 for amplifying, obtain
To the raw value of bridge type pressure sensor output signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710044113.5A CN106840470B (en) | 2017-01-19 | 2017-01-19 | A kind of bridge type pressure sensor output signal acquisition device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710044113.5A CN106840470B (en) | 2017-01-19 | 2017-01-19 | A kind of bridge type pressure sensor output signal acquisition device and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023562A (en) * | 2017-12-18 | 2018-05-11 | 南京邮电大学 | Areflexia lattice filter |
| CN110567616A (en) * | 2019-08-29 | 2019-12-13 | 北京自动化控制设备研究所 | Signal acquisition circuit for silicon piezoresistive pressure sensor unit |
| CN114295280A (en) * | 2022-03-09 | 2022-04-08 | 成都凯天电子股份有限公司 | Pressure signal scanning measurement system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323466A (en) * | 2011-08-24 | 2012-01-18 | 苏州生物医学工程技术研究所 | Weak signal acquisition and processing circuit |
| CN103187938A (en) * | 2011-12-27 | 2013-07-03 | 国民技术股份有限公司 | Difference simulation front end device for low-frequency signal detection and transmission system |
| CN103743505A (en) * | 2013-12-20 | 2014-04-23 | 广西科技大学 | Acquisition method for automobile strain signal |
| CN203859727U (en) * | 2013-11-28 | 2014-10-01 | 重庆理工大学 | Device for detecting weak signals |
| CN105193401A (en) * | 2015-08-24 | 2015-12-30 | 湖北科技学院 | High-precision arm-type electronic sphygmomanometer and detection method thereof |
| CN105249946A (en) * | 2015-10-26 | 2016-01-20 | 武汉思创电子有限公司 | Invasive blood pressure acquisition circuit for inhibiting temperature drift |
| CN105553443A (en) * | 2015-12-10 | 2016-05-04 | 贵州省计量测试院 | Weak signal extraction and digital processing system under strong noise condition |
-
2017
- 2017-01-19 CN CN201710044113.5A patent/CN106840470B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102323466A (en) * | 2011-08-24 | 2012-01-18 | 苏州生物医学工程技术研究所 | Weak signal acquisition and processing circuit |
| CN103187938A (en) * | 2011-12-27 | 2013-07-03 | 国民技术股份有限公司 | Difference simulation front end device for low-frequency signal detection and transmission system |
| CN203859727U (en) * | 2013-11-28 | 2014-10-01 | 重庆理工大学 | Device for detecting weak signals |
| CN103743505A (en) * | 2013-12-20 | 2014-04-23 | 广西科技大学 | Acquisition method for automobile strain signal |
| CN105193401A (en) * | 2015-08-24 | 2015-12-30 | 湖北科技学院 | High-precision arm-type electronic sphygmomanometer and detection method thereof |
| CN105249946A (en) * | 2015-10-26 | 2016-01-20 | 武汉思创电子有限公司 | Invasive blood pressure acquisition circuit for inhibiting temperature drift |
| CN105553443A (en) * | 2015-12-10 | 2016-05-04 | 贵州省计量测试院 | Weak signal extraction and digital processing system under strong noise condition |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023562A (en) * | 2017-12-18 | 2018-05-11 | 南京邮电大学 | Areflexia lattice filter |
| CN110567616A (en) * | 2019-08-29 | 2019-12-13 | 北京自动化控制设备研究所 | Signal acquisition circuit for silicon piezoresistive pressure sensor unit |
| CN114295280A (en) * | 2022-03-09 | 2022-04-08 | 成都凯天电子股份有限公司 | Pressure signal scanning measurement system |
| CN114295280B (en) * | 2022-03-09 | 2022-06-07 | 成都凯天电子股份有限公司 | Pressure signal scanning measurement system |
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