CN109357793A - A kind of pressure-measuring system and method based on voltage-type pressure sensor - Google Patents
A kind of pressure-measuring system and method based on voltage-type pressure sensor Download PDFInfo
- Publication number
- CN109357793A CN109357793A CN201811437886.0A CN201811437886A CN109357793A CN 109357793 A CN109357793 A CN 109357793A CN 201811437886 A CN201811437886 A CN 201811437886A CN 109357793 A CN109357793 A CN 109357793A
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- voltage
- pressure sensor
- type pressure
- main control
- control module
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Classifications
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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
- G01L1/005—Measuring force or stress, in general by electrical means and not provided for in G01L1/06 - G01L1/22
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
Abstract
The invention discloses a kind of pressure-measuring system and method based on voltage-type pressure sensor, including main control module, power module and voltage-type pressure sensor, the connection of the power end of power module and main control module, the power end of voltage-type pressure sensor and the control voltage output end of main control module and the first AD Sampling Interface connect, input power V of the main control module output control voltage as voltage-type pressure sensorpi, and the input power V of collection voltages type pressure sensorpiDigital quantity npi, the 2nd AD Sampling Interface connection of the output end and main control module of voltage-type pressure sensor, the output voltage V of main control module collection voltages type pressure sensorpoDigital quantity npo, main control module pass through formula P=k*npo*Pmax/npi+P0, the pressure value P of measurement is calculated；Wherein, k, P0For the corrected parameter of voltage-type pressure sensor, PmaxFor the range of voltage-type pressure sensor.The present invention improves voltage-type pressure sensor measurement accuracy by simply and easily mode.
Description
Technical field
The invention belongs to art of pressure sensors, and in particular to a kind of pressure measurement system based on voltage-type pressure sensor
System and method.
Background technique
Wisdom society, Internet of Things need various awareness apparatus, need various sensors, pressure is as a physics
Amount, the life, production with the mankind are closely bound up.The perception of the characteristic requirements big data, multiple spot of Internet of Things；And the sensing of low-power consumption
Device can be powered with battery, facilitate deploying to ensure effective monitoring and control of illegal activities for multiple spot.
Voltage-type pressure sensor, compared to other types of pressure sensor, advantage is: small power consumption, cooperates to biography
The power-on time of sensor controls, and power consumption can accomplish A grades of μ；Disadvantage is: the acquisition of its pressure is by voltage-type pressure sensor
The supply voltage of power supply influences, it is generally recognized that it is equal to system power source voltage or there are consistent difference with system power source voltage；
And the supply voltage difference powered on each product of practically identical model to voltage-type pressure sensor, this
Difference changes in entire product operational process with the variation of the factors such as temperature.The existing pressure based on voltage-type pressure sensor
Force measuring system, including main control module, power module and voltage-type pressure sensor, power module is to main control module and electricity
The power supply of die mould pressure sensor, the output end of voltage-type pressure sensor and the AD Sampling Interface of main control module connect, master control
The output voltage V of molding block collection voltages type pressure sensorpoDigital quantity npo, and pass through formula: Vpo=Vsi*npo/2N, calculate
Obtain the output voltage V of voltage-type pressure sensorpo, wherein N indicates the digit of AD sampling.Voltage-type pressure sensor it is defeated
Voltage V outpoIt will receive reference voltage (i.e. system power supply of measurement chip (single-chip microcontroller i.e. in main control module) in AD sampling
Vsi) fluctuating change influence.In the equipment in laboratory, certain cost can be paid using a high-performance regulated power supply, but
It is a bit unrealistic using high-performance regulated power supply when on each slight product；It is, therefore, usually considered that when AD is sampled
Reference voltage is a fixed value；And benchmark of the measurement chip when AD is sampled on each product of practically identical model
All difference, this difference have changed in entire product operational process voltage with the variation of the factors such as temperature.
To solve the above-mentioned problems, some ways are to carry out electrical secondary system mark to the pressure value of each collected product
Fixed, the number of calibration point is determined by the requirement of product, it is desirable that high, the points of calibration are more, it is desirable that low, nominal voltage type pressure
The both ends of the measurement range of sensor, then do linear fit.These processing methods have its science, but its limitation is also obvious, mark
Determine process complexity, heavy workload.
Summary of the invention
The object of the present invention is to provide a kind of pressure-measuring system and method based on voltage-type pressure sensor, to pass through
Simply and easily mode come improve voltage-type pressure sensor measurement accuracy.
Pressure-measuring system of the present invention based on voltage-type pressure sensor, including main control module, power supply mould
The power end of block and voltage-type pressure sensor, the power module and main control module connects, and provides system to main control module
Unite power supply Vsi, the of the control voltage output end and main control module of the power end of voltage-type pressure sensor and main control module
The connection of one AD Sampling Interface, input power V of the main control module output control voltage as voltage-type pressure sensorpi, and adopt
The input power V of current collection die mould pressure sensorpiDigital quantity npi, output end and the master control molding of voltage-type pressure sensor
2nd AD Sampling Interface of block connects, the output voltage V of main control module collection voltages type pressure sensorpoDigital quantity npo,
The ground terminal of main control module is grounded, and the ground terminal ground connection of voltage-type pressure sensor, main control module is to the input power
VpiDigital quantity npiWith the output voltage VpoDigital quantity npoThe pressure value measured after being handled.
The power module includes the first battery BT1, the second battery BT2, first resistor R1, first capacitor C1, the second electricity
Hold C2, third capacitor C3, the 4th capacitor CE1 and voltage-stablizer U1, the first battery BT1 is in parallel with the second battery BT2, the second battery
The cathode of BT2 is grounded, and the anode of the second battery BT2 meets one end of first resistor R1, one end of first capacitor C1 and voltage-stablizer U1
Input terminal, the enable end of another termination voltage-stablizer of first resistor R1, the other end ground connection of first capacitor C1 and connects pressure stabilizing
The power end (i.e. the power end of voltage-stablizer U1 is also grounded) of device U1, one end of the second capacitor C2 of output termination of voltage-stablizer U1, the
One end of three capacitor C3, the 4th capacitor CE1 anode, and output system power supply Vsi(system power supply VsiIt is input to main control
The power end of module), the cathode ground connection of the other end of the second capacitor C2, the other end of third capacitor C3 and the 4th capacitor CE1, surely
The ground terminal of depressor U1 is grounded.
Preferably, the model TPS78233 of the voltage-stablizer U1.
Pressure measurement method of the present invention based on voltage-type pressure sensor, using above-mentioned pressure-measuring system,
This method are as follows: main control module utilizes the input power V of the first AD Sampling Interface acquisitionpiDigital quantity npiWith the 2nd AD
The output voltage V of Sampling Interface acquisitionpoDigital quantity npo, pass through formula P=k*npo*Pmax/npi+P0, measurement is calculated
Pressure value P；Wherein, k, P0For the corrected parameter of voltage-type pressure sensor, PmaxFor the range of voltage-type pressure sensor.
The present invention utilizes the input power V of voltage-type pressure sensorpiDigital quantity npiWith output voltage VpoDigital quantity
npoTo calculate the pressure value of measurement, the calculating of the pressure value and system power supply VsiUnrelated, the calculating of the pressure value introduces input
Power supply VpiDigital quantity (consider voltage-type pressure sensor power supply supply voltage difference, changing factor), to improve
The accuracy of voltage-type pressure sensor measurement.
Detailed description of the invention
Fig. 1 is the schematic block circuit diagram of embodiment.
Fig. 2 is the circuit diagram of power module in embodiment.
Fig. 3 is the circuit theory schematic diagram that main control module is connect with voltage-type pressure sensor in embodiment.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention.
Pressure-measuring system based on voltage-type pressure sensor as shown in Figure 1, Figure 2, Figure 3 shows, including main control module
1, power module 2 and voltage-type pressure sensor 3.
As shown in Fig. 2, power module 2 include the first battery BT1, the second battery BT2, first resistor R1, first capacitor C1,
The model TPS78233 of second capacitor C2, third capacitor C3, the 4th capacitor CE1 and voltage-stablizer U1, voltage-stablizer U1, the first battery
BT1 is in parallel with the second battery BT2, and the cathode ground connection of the second battery BT2, the anode of the second battery BT2 connects the one of first resistor R1
The input terminal (i.e. pin 1) at end, one end of first capacitor C1 and voltage-stablizer U1, another termination voltage-stablizer of first resistor R1 make
Energy end (i.e. pin 3), the other end ground connection of first capacitor C1, and meet the power end (i.e. pin 2) of voltage-stablizer U1, voltage-stablizer U1
Output end (i.e. pin 5) connect one end of the second capacitor C2, one end of third capacitor C3, the 4th capacitor CE1 anode, and it is defeated
System power supply V outsi, the cathode ground connection of the other end of the second capacitor C2, the other end of third capacitor C3 and the 4th capacitor CE1, surely
The ground terminal (i.e. pin 4) of depressor U1 is grounded.
As shown in figure 3, the circuit structure of main control module 1 is the prior art, main control module 1 includes single-chip microcontroller U2, crystalline substance
Shake circuit, routine interface circuit and decoupling circuit, the model EFM32TG840 of single-chip microcontroller U2, crystal oscillating circuit include crystal oscillator Y3,
5th capacitor C5 and the 6th capacitor C6, routine interface circuit include connecting terminal J1, second resistance R2,3rd resistor R3 and the 4th
Resistance R4, decoupling circuit include the 7th capacitor C7, the 8th capacitor C8, the 9th capacitor C9 and the tenth capacitor C10.
The output end of voltage-stablizer U1 is connect with the power end of main control module 1, provides system power supply to main control module 1
Vsi, voltage-type pressure sensor 3(, that is, P_Sensor) power end and main control module 1 control voltage output end (i.e. monolithic
The pin 33 of machine U2) and main control module 1 the first AD Sampling Interface (i.e. the pin 32 of single-chip microcontroller U2) connection, main control module
Input power V of the 1 output control voltage as voltage-type pressure sensor 3pi, main control module 1 pass through the first AD Sampling Interface
The input power V of collection voltages type pressure sensor 3piDigital quantity npi, the output end of voltage-type pressure sensor 3 and master control
The 2nd AD Sampling Interface (i.e. the pin 31 of single-chip microcontroller U2) of molding block 1 connects, and main control module 1 passes through the 2nd AD Sampling Interface
The output voltage V of collection voltages type pressure sensor 3poDigital quantity npo, the ground terminal ground connection of main control module 1, voltage-type pressure
The ground terminal of force snesor 3 is grounded.
The method that pressure measurement is carried out using the above-mentioned pressure-measuring system based on voltage-type pressure sensor are as follows:
Main control module 1 passes through the input power V of the first AD Sampling Interface collection voltages type pressure sensor 3piDigital quantity
npi, main control module 1 passes through the output voltage V of the 2nd AD Sampling Interface collection voltages type pressure sensor 3poDigital quantity npo。
Due to input power VpiRelative to system power supply VsiRelative value are as follows: Vpi/Vsi = npi/2N, output voltage VpoPhase
For system power supply VsiRelative value are as follows: Vpo/Vsi = npo/2N, calculation of pressure formula are as follows: P=k*Vpo*Pmax/Vpi+P0, will be defeated
Enter power supply Vpi, output voltage VpoSubstitute into calculation of pressure formula, the pressure value P=k*n measuredpo*Pmax/npi+P0；Therefore, single
Piece machine U2 passes through formula P=k*npo*Pmax/npi+P0, the pressure value P of measurement is calculated；Wherein, k, P0For voltage-type pressure biography
The corrected parameter of sensor 3, PmaxFor the range of voltage-type pressure sensor 3.
The calculating of the pressure value and system power supply VsiUnrelated, the calculating of the pressure value introduces input power VpiDigital quantity npi
(considering supply voltage difference, the changing factor of the power supply of voltage-type pressure sensor), improves voltage-type pressure sensor
The accuracy of measurement.
Claims (4)
1. a kind of pressure-measuring system based on voltage-type pressure sensor, including main control module (1), power module (2) and
Voltage-type pressure sensor (3), it is characterised in that: the power module (2) connect with the power end of main control module (1), gives
Main control module (1) provides system power supply Vsi, the control of the power end of voltage-type pressure sensor (3) and main control module (1)
Voltage output end is connected with the first AD Sampling Interface of main control module (1), and main control module (1) output control voltage is as electricity
The input power V of die mould pressure sensor (3)pi, and the input power V of collection voltages type pressure sensor (3)piDigital quantity
npi, the output end of voltage-type pressure sensor (3) connect with the 2nd AD Sampling Interface of main control module (1), main control module
(1) the output voltage V of collection voltages type pressure sensor (3)poDigital quantity npo, the ground terminal ground connection of main control module (1),
The ground terminal of voltage-type pressure sensor (3) is grounded, and main control module (1) is to the input power VpiDigital quantity npiAnd institute
State output voltage VpoDigital quantity npoThe pressure value measured after being handled.
2. the pressure-measuring system according to claim 1 based on voltage-type pressure sensor, it is characterised in that: the electricity
Source module (2) includes the first battery BT1, the second battery BT2, first resistor R1, first capacitor C1, the second capacitor C2, third electricity
Hold C3, the 4th capacitor CE1 and voltage-stablizer U1, the first battery BT1 is in parallel with the second battery BT2, and the cathode of the second battery BT2 connects
The anode on ground, the second battery BT2 connects the input terminal of one end of first resistor R1, one end of first capacitor C1 and voltage-stablizer U1, the
The enable end of another termination voltage-stablizer of one resistance R1, the other end ground connection of first capacitor C1, and connect the power supply of voltage-stablizer U1
End, voltage-stablizer U1 output termination one end of the second capacitor C2, one end of third capacitor C3, the 4th capacitor CE1 anode, and
Output system power supply Vsi, the cathode ground connection of the other end of the second capacitor C2, the other end of third capacitor C3 and the 4th capacitor CE1,
The ground terminal of voltage-stablizer U1 is grounded.
3. the pressure-measuring system according to claim 1 or 2 based on voltage-type pressure sensor, it is characterised in that: institute
State the model TPS78233 of voltage-stablizer U1.
4. a kind of pressure measurement method based on voltage-type pressure sensor, using the pressure as described in claims 1 to 3 is any
Measuring system, which is characterized in that this method are as follows: main control module (1) utilizes the input power VpiDigital quantity npiWith it is described
Output voltage VpoDigital quantity npo, pass through formula P=k*npo*Pmax/npi+P0, the pressure value P of measurement is calculated；Wherein, k,
P0For the corrected parameter of voltage-type pressure sensor, PmaxFor the range of voltage-type pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437886.0A CN109357793B (en) | 2018-11-29 | 2018-11-29 | Pressure measurement system and method based on voltage type pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811437886.0A CN109357793B (en) | 2018-11-29 | 2018-11-29 | Pressure measurement system and method based on voltage type pressure sensor |
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| CN109357793A true CN109357793A (en) | 2019-02-19 |
| CN109357793B CN109357793B (en) | 2023-10-20 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781772A (en) * | 2021-02-07 | 2021-05-11 | 中国石油天然气集团有限公司 | Online tensiometer system and method |
| CN114327236A (en) * | 2021-12-13 | 2022-04-12 | 昌辉汽车电器（黄山）股份公司 | Judgment method for adding voltage correction factor when single chip microcomputer receives AD signal |
| CN114327236B (en) * | 2021-12-13 | 2024-04-09 | 昌辉汽车电器（黄山）股份公司 | Judgment method for adding voltage correction factor when singlechip receives AD signal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781772A (en) * | 2021-02-07 | 2021-05-11 | 中国石油天然气集团有限公司 | Online tensiometer system and method |
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| CN114327236A (en) * | 2021-12-13 | 2022-04-12 | 昌辉汽车电器（黄山）股份公司 | Judgment method for adding voltage correction factor when single chip microcomputer receives AD signal |
| CN114327236B (en) * | 2021-12-13 | 2024-04-09 | 昌辉汽车电器（黄山）股份公司 | Judgment method for adding voltage correction factor when singlechip receives AD signal |
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