CN207540700U - A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function - Google Patents
A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function Download PDFInfo
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- CN207540700U CN207540700U CN201721691655.3U CN201721691655U CN207540700U CN 207540700 U CN207540700 U CN 207540700U CN 201721691655 U CN201721691655 U CN 201721691655U CN 207540700 U CN207540700 U CN 207540700U
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Abstract
A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function of the utility model, belongs to road foundation pressure-detecting device technical field.The technical problem to be solved is that：A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function is provided；Solve technical solution that the technical problem uses for：Including central controller, constant-current source drive module, differential voltage amplification module, data communication module and power supply module；The power end of the central controller is connected with power supply module, and the signal output end of central controller is connected with differential voltage amplification module, and the constant-current source drive module is connected with differential voltage amplification module；The signal output end of the central controller is also associated with data communication module；The signal input part of the central controller is connected with piezoresistive transducer；The utility model installation is applied to road foundation pressure detecting place.
Description
Technical field
A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function of the utility model, belongs to
Road roadbed pressure-detecting device technical field.
Background technology
The important link of public way safe operation is to ensure that the monitoring of public way structure, wherein to road foundation
Pressure detecting is important one during entire monitoring, the pressure measurement of road foundation is needed using pressure sensor, pressure drag
Formula sensor is a kind of physical pressure numerical value to be changed into electrical signal voltage value and carry out the device of transmission process；With information
The high speed development for the treatment of technology and computer technology, front end unit of the sensor as various control systems is more and more important, with
Because having, small, performance is high, cheap etc. excellent for semiconductor force-sensing sensor made of principle for the piezoresistive effect of semi-conducting material
Point is widely applied, and from the automobile and consumer electronics of civil field to military domain, piezoresistive transducer is all wherein
Play important role.
But due in practical engineering project its utilize scattering technology formed electric bridge resistance value output difference voltage signal,
Transmission range is limited in practical applications for amplified differential voltage signal, and its transmission rate is relatively low and signal easily by
Interference, limits the raising and application of such device accuracy.
With expansion and intensification that piezoresistive transducer is applied in every field, while improving self performance, it should protect
Demonstrate,prove the accuracy of piezoresistive transducer work, it is necessary to which circuits improvement is carried out to the piezoresistive transducer after encapsulation；For example, pressure resistance type
In transmission since the resistance value of circuit leads to the attenuation of signal, and practical letter after the voltage differential signal amplification of sensor output
Number transmission in can also to signal generate interference, it is necessary to take measures effectively to improve sensor.
Utility model content
The utility model overcomes the shortcomings of the prior art, and technical problem to be solved is：One kind is provided and has length
The road foundation pressure-detecting device of Distance Transmission and anti-interference function；In order to solve the above-mentioned technical problem, the utility model is adopted
Technical solution is：A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function, including center
Controller, constant-current source drive module, differential voltage amplification module, data communication module and power supply module；
The power end of the central controller is connected with power supply module, the signal output end and difference of central controller
Voltage amplification module is connected, and the constant-current source drive module is connected with differential voltage amplification module；
The signal output end of the central controller is also associated with data communication module；
The signal input part of the central controller is connected with piezoresistive transducer；
The circuit structure of the differential voltage amplification module is：The chip that the differential voltage amplification module uses is U1；
The 1 foot ground connection of the chip U1；
Control 2 feet of chip U1 successively and one end of connecting resistance R6, one end of resistance R10, one end of resistance R9, resistance R5
One end after be connected with one end of resistance R4；
4 feet of the chip U1 successively and the other end of connecting resistance R6, one end after the other end of resistance R10 with resistance R8
Be connected, the other end of the resistance R9 successively and the other end of connecting resistance R5,5 foot phases behind one end of resistance R7 with chip U1
Even, the other end of the resistance R8 is sequentially connected in series resistance R1, is connected after resistance R3 with the other end of resistance R7；
3 feet of the chip U1 successively and connecting resistance R2 one end, the other end of resistance R4, one end of resistance R13, capacitance
Line behind one end of C3 between resistance R1 and resistance R3 is connected, the other end ground connection of the resistance R2；
It is connected after 6 feet of the chip U1 and the other end of connecting resistance R13 with one end of resistance R12；
It is connected behind one end of the 7 foot shunt-wound capacitance C2 of the chip U1 with the base stage of triode Q1, the capacitance C2's is another
One end and the collector for meeting triode Q1 are connected with the other end of capacitance C3 after the other end of resistance R12；
It is connected behind one end of the 8 foot shunt-wound capacitance C1 of the chip U1 with one end of resistance R11, the capacitance C1's is another
End ground connection, the other end of the resistance R11 are simultaneously connected after connecing the emitter of triode Q1 with the signal output end of central controller.
The circuit structure of the data communication module is：The chip that the data communication module uses is U2；
1 foot of the chip U2,2 feet, 3 feet, 4 feet are connected with the signal output end of central controller；
The 5 feet ground connection of the chip U2；
6 feet of the chip U2 successively and one end of connecting resistance R15, the signal behind one end of resistance R14 with communication module
Output terminal is connected；
7 feet of the chip U2 successively and the other end of connecting resistance R15, the letter behind one end of resistance R16 with communication module
Number output terminal is connected；
It is connected after 8 feet of the chip U2 and the other end of connecting resistance R14 with one end of capacitance C12, the capacitance C12's
It is grounded after the other end of the other end and connecting resistance R16.
The circuit structure of the power supply module is：The chip that the power supply module uses is U3 and U4；
Successively and the anode of electrode capacitance C4 is connected to after positive pole concatenation switch S1, after the anode for having electrode capacitance C11
It is connected with the input terminal of chip U3, the output terminal of the chip U3 successively and is connected to the anode of electrode capacitance C5, there is electrode capacitance C6's
Anode has the anode of electrode capacitance C7, is connected after having the anode of electrode capacitance C8 with the input terminal of chip U4；
The power cathode successively and is connected to the cathode of electrode capacitance C4, the cathode for having electrode capacitance C11, the ground connection of chip U3
There is the cathode of electrode capacitance C5 at end, is grounded after the cathode for having electrode capacitance C6；
The output terminal of the chip U4 successively and be connected to the anode of electrode capacitance C9 and have after the anode of electrode capacitance C10 with center
The power end of controller is connected, described to have the cathode of electrode capacitance C7 successively and be connected to the cathode of electrode capacitance C8, the ground connection of chip U4
There is the cathode of electrode capacitance C9 at end, is grounded after the cathode for having electrode capacitance C10.
The central controller is also associated with power down protection module.
The signal output end of the data communication module is connected with monitoring center computer.
The data communication module is RS485 communication modules.
The chip model that the central controller uses is STM32C8T6.
The utility model has an advantageous effect in that compared with prior art：The utility model is by using application specific processor
Chip is improved in the peripheral circuit of piezoresistive transducer, by the way that constant-current source amplifying circuit and differential signal voltage is set to put
The collected signal of sensor can be amplified, analog to digital conversion circuit built in the central controller used by big circuit, to acquisition
Data are transmitted to communication module after being handled, the interface circuit interface level that the transmission process of data in circuit uses is low,
Data transmission bauds is fast, strong antijamming capability, can effectively improve the efficiency of transmission of pressure drag data.
Description of the drawings
The utility model is described further below in conjunction with the accompanying drawings：
Fig. 1 is the structure diagram of the utility model；
Fig. 2 is the electrical block diagram of the utility model differential voltage amplification module；
Fig. 3 is the electrical block diagram of the utility model data communication module；
Fig. 4 is the circuit structure structure chart of the utility model power supply module；
In figure：1 be central controller, 2 be constant-current source drive module, 3 be differential voltage amplification module, 4 be data communication
Module, 5 be power supply module, 6 be piezoresistive transducer, 7 be power down protection module, 8 be monitoring center computer.
Specific embodiment
As described in Figure 1, a kind of road foundation pressure detecting for having long distance transmission and anti-interference function of the utility model
Device is supplied including central controller 1, constant-current source drive module 2, differential voltage amplification module 3, data communication module 4 and power supply
Electric module 5；
The power end of the central controller 1 is connected with power supply module 5, the signal output end of central controller 1 with
Differential voltage amplification module 3 is connected, and the constant-current source drive module 2 is connected with differential voltage amplification module 3；
The signal output end of the central controller 1 is also associated with data communication module 4；
The signal input part of the central controller 1 is connected with piezoresistive transducer 6；
The circuit structure of the differential voltage amplification module 3 is：The chip that the differential voltage amplification module 3 uses is
U1；
The 1 foot ground connection of the chip U1；
Control 2 feet of chip U1 successively and one end of connecting resistance R6, one end of resistance R10, one end of resistance R9, resistance R5
One end after be connected with one end of resistance R4；
4 feet of the chip U1 successively and the other end of connecting resistance R6, one end after the other end of resistance R10 with resistance R8
Be connected, the other end of the resistance R9 successively and the other end of connecting resistance R5,5 foot phases behind one end of resistance R7 with chip U1
Even, the other end of the resistance R8 is sequentially connected in series resistance R1, is connected after resistance R3 with the other end of resistance R7；
3 feet of the chip U1 successively and connecting resistance R2 one end, the other end of resistance R4, one end of resistance R13, capacitance
Line behind one end of C3 between resistance R1 and resistance R3 is connected, the other end ground connection of the resistance R2；
It is connected after 6 feet of the chip U1 and the other end of connecting resistance R13 with one end of resistance R12；
It is connected behind one end of the 7 foot shunt-wound capacitance C2 of the chip U1 with the base stage of triode Q1, the capacitance C2's is another
One end and the collector for meeting triode Q1 are connected with the other end of capacitance C3 after the other end of resistance R12；
It is connected behind one end of the 8 foot shunt-wound capacitance C1 of the chip U1 with one end of resistance R11, the capacitance C1's is another
End ground connection, the other end of the resistance R11 simultaneously connect the signal output end phase after the emitter of triode Q1 with central controller 1
Even.
The circuit structure of the data communication module 4 is：The chip that the data communication module 4 uses is U2；
1 foot of the chip U2,2 feet, 3 feet, signal output end of 4 feet with central controller 1 are connected；
The 5 feet ground connection of the chip U2；
6 feet of the chip U2 successively and one end of connecting resistance R15, the signal behind one end of resistance R14 with communication module 4
Output terminal is connected；
7 feet of the chip U2 successively and the other end of connecting resistance R15, the letter behind one end of resistance R16 with communication module 4
Number output terminal is connected；
It is connected after 8 feet of the chip U2 and the other end of connecting resistance R14 with one end of capacitance C12, the capacitance C12's
It is grounded after the other end of the other end and connecting resistance R16.
The circuit structure of the power supply module 5 is：The chip that the power supply module 5 uses is U3 and U4；
Successively and the anode of electrode capacitance C4 is connected to after positive pole concatenation switch S1, after the anode for having electrode capacitance C11
It is connected with the input terminal of chip U3, the output terminal of the chip U3 successively and is connected to the anode of electrode capacitance C5, there is electrode capacitance C6's
Anode has the anode of electrode capacitance C7, is connected after having the anode of electrode capacitance C8 with the input terminal of chip U4；
The power cathode successively and is connected to the cathode of electrode capacitance C4, the cathode for having electrode capacitance C11, the ground connection of chip U3
There is the cathode of electrode capacitance C5 at end, is grounded after the cathode for having electrode capacitance C6；
The output terminal of the chip U4 successively and be connected to the anode of electrode capacitance C9 and have after the anode of electrode capacitance C10 with center
The power end of controller 1 is connected, described to have the cathode of electrode capacitance C7 successively and be connected to the cathode of electrode capacitance C8, the ground connection of chip U4
There is the cathode of electrode capacitance C9 at end, is grounded after the cathode for having electrode capacitance C10.
The central controller 1 is also associated with power down protection module 7.
The signal output end of the data communication module 4 is connected with monitoring center computer 8.
The data communication module 4 is RS485 communication modules.
The chip model that the central controller 1 uses is STM32C8T6.
The central controller 1 set inside the utility model is built-in with analog-to-digital conversion process circuit, can be to the amplification of output
Differential signal carry out high Precision Processing, so as to get differential voltage signal it is more accurate；The master chip of central controller 1 possesses
3 ADC, these ADC independently use can also can use double-mode, which uses the simulation number of 12 Approach by inchmeal
Word converter can carry out high Precision Processing to the differential signal of amplification；At work, central controller 1 senses pressure resistance type
Device 6 collects pressure data and is compared and obtained after being corrected more accurately pressure result with internal preset value.
The program of 1 internal preset of central controller can be numbered to multiple piezoresistive transducers 6, make identifier
It is identified, it may be verified that receive the accuracy of data, and can clearly identify it is data which sensor is passed back；Central controller
1 outside uses high speed crystal oscillator circuit design so that central controller 1 can quickly send out data acquisition command, and high speed processing
Voltage signal.
The constant-current source drive module 2 can provide constant-current source exciting current and differential voltage amplification module 3 coordinates work
Make, the differential signal of the output of piezoresistive transducer 6 can be amplified, provide stable constant current source current for a long time for sensor, no
The sensitivity of sensor can be reduced because of longevity of service；The control chip U1 types that the differential voltage amplification module 3 uses
Number be AM417.
The constant-current source drive module 2 can be energized as the driving exciting circuit of piezoresistive transducer 6, sensor after again
By differential voltage amplification module 3, the operating voltage of exportable 0.5-4.5V, the size of output voltage can also be according to actual conditions
Adjustment exports suitable voltage.
The differential voltage amplification module 3 forms common collector amplifying circuit using PNP triode Q1 and its peripheral circuit,
The electric current of output terminal can be controlled by a resistance of connecting to the emitter of triode simultaneously, triode Q1 and chip U1's
Thermo-contact can effectively reduce the temperature drift of output current, improve the current limit capability of circuit.
The data communication module 4 is RS485 processing circuits, and the chip U2 model SP3485 used can be by centre
It manages treated the data of device 1 and carries out remote transmission, by the module transfer rate higher, antijamming capability is stronger, and can reduce
The interference of noise, transmission range is farther, supports multinode work, at most can reach 32 nodes；Data are through RS485 industrial cables
Monitoring center computer 8 is transmitted to, staff understands the data of each road foundation pressure state by display screen in time.
The power supply module 5 is powered using constant-current source circuit for central controller 1, can keep supply current for a long time
Stablize, in the absence of between drifting problem, the model 78M05 of chips U3 uses, the type of chip U4 as Voltagre regulator
Number for LM1117, used as voltage regulator.
The utility model is additionally provided with power down protection module 7, specially VBAT power down protections module, can make central control
Device 1 processed still can preserve data under power-down conditions, prevent loss of data.
The piezoresistive transducer used now does not have waterproof lightning protection measures, is highly susceptible to external environment in practical applications
The influence of factor may all impact service life and sensitivity；The utility model is same to the circuit of piezoresistive transducer 6
When done the anti-electric measure of waterproof, pressure sensor is protected using protective film, sensor is prevented to be damaged by corrosion, due to protect
The roadbed pressure born can be passed to pressure sensor by the effect of cuticula in the case of smaller loss substantially, equally may be used
Sensor is made to keep higher sensitivity, in addition sensor circuit has done grounding, can play the effect of lightning protection.
Finally it should be noted that：The above various embodiments is only to illustrate the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, those of ordinary skill in the art should
Understand：It can still modify to the technical solution recorded in foregoing embodiments either to which part or whole
Technical characteristic carries out equivalent replacement；And these modifications or replacement, this practicality that it does not separate the essence of the corresponding technical solution are new
The range of each embodiment technical solution of type.
Claims (7)
1. a kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function, it is characterised in that：Including in
Entreat controller（1）, constant-current source drive module（2）, differential voltage amplification module（3）, data communication module（4）With power supply power supply mould
Block（5）；
The central controller（1）Power end and power supply module（5）It is connected, central controller（1）Signal output end
With differential voltage amplification module（3）It is connected, the constant-current source drive module（2）With differential voltage amplification module（3）It is connected；
The central controller（1）Signal output end be also associated with data communication module（4）；
The central controller（1）Signal input part and piezoresistive transducer（6）It is connected；
The differential voltage amplification module（3）Circuit structure be：The differential voltage amplification module（3）The chip used is
U1；
The 1 foot ground connection of the chip U1；
Control 2 feet of chip U1 successively and one end of connecting resistance R6, one end of resistance R10, one end of resistance R9, the one of resistance R5
One end behind end with resistance R4 is connected；
4 feet of the chip U1 successively and the other end of connecting resistance R6, one end phase after the other end of resistance R10 with resistance R8
Even, the other end of the resistance R9 successively and the other end of connecting resistance R5, is connected behind one end of resistance R7 with 5 feet of chip U1,
The other end of the resistance R8 is sequentially connected in series resistance R1, is connected after resistance R3 with the other end of resistance R7；
3 feet of the chip U1 successively and connecting resistance R2 one end, the other end of resistance R4, one end of resistance R13, capacitance C3's
Line behind one end between resistance R1 and resistance R3 is connected, the other end ground connection of the resistance R2；
It is connected after 6 feet of the chip U1 and the other end of connecting resistance R13 with one end of resistance R12；
It is connected behind one end of the 7 foot shunt-wound capacitance C2 of the chip U1 with the base stage of triode Q1, the other end of the capacitance C2
And the collector of triode Q1 is connect, the other end after the other end of resistance R12 with capacitance C3 is connected；
It is connected behind one end of the 8 foot shunt-wound capacitance C1 of the chip U1 with one end of resistance R11, another termination of the capacitance C1
Ground, the other end of the resistance R11 and connect after the emitter of triode Q1 with central controller（1）Signal output end be connected.
2. a kind of road foundation pressure detecting dress for having long distance transmission and anti-interference function according to claim 1
It puts, it is characterised in that：The data communication module（4）Circuit structure be：The data communication module（4）The chip used is
U2；
1 foot of the chip U2,2 feet, 3 feet, 4 feet are and central controller（1）Signal output end be connected；
The 5 feet ground connection of the chip U2；
6 feet of the chip U2 successively and one end of connecting resistance R15, behind one end of resistance R14 with communication module（4）Signal it is defeated
Outlet is connected；
7 feet of the chip U2 successively and the other end of connecting resistance R15, behind one end of resistance R16 with communication module（4）Signal
Output terminal is connected；
It is connected after 8 feet of the chip U2 and the other end of connecting resistance R14 with one end of capacitance C12, the capacitance C12's is another
It holds and is grounded after the other end of connecting resistance R16.
3. a kind of road foundation pressure detecting dress for having long distance transmission and anti-interference function according to claim 2
It puts, it is characterised in that：The power supply module（5）Circuit structure be：The power supply module（5）The chip used is
U3 and U4；
Successively and be connected to the anode of electrode capacitance C4 after positive pole concatenation switch S1, have after the anode of electrode capacitance C11 with core
The input terminal of piece U3 is connected, and the output terminal of the chip U3 successively and is connected to the anode of electrode capacitance C5, the anode for having electrode capacitance C6,
There is the anode of electrode capacitance C7, be connected after having the anode of electrode capacitance C8 with the input terminal of chip U4；
The power cathode successively and is connected to the cathode of electrode capacitance C4, and the cathode for having electrode capacitance C11, the ground terminal of chip U3 has
The cathode of electrode capacitance C5 is grounded after the cathode for having electrode capacitance C6；
The output terminal of the chip U4 successively and is connected to the anode of electrode capacitance C9 and has and controlled with center after the anode of electrode capacitance C10
Device（1）Power end be connected, it is described to have the cathode of electrode capacitance C7 successively and be connected to the cathode of electrode capacitance C8, the ground connection of chip U4
There is the cathode of electrode capacitance C9 at end, is grounded after the cathode for having electrode capacitance C10.
4. a kind of road foundation pressure detecting dress for having long distance transmission and anti-interference function according to claim 3
It puts, it is characterised in that：The central controller（1）It is also associated with power down protection module（7）.
5. a kind of road foundation pressure detecting dress for having long distance transmission and anti-interference function according to claim 4
It puts, it is characterised in that：The data communication module（4）Signal output end and monitoring center computer（8）It is connected.
6. a kind of road foundation pressure detecting dress for having long distance transmission and anti-interference function according to claim 5
It puts, it is characterised in that：The data communication module（4）For RS485 communication modules.
7. a kind of road foundation pressure detecting dress for having long distance transmission and anti-interference function according to claim 1
It puts, it is characterised in that：The central controller（1）The chip model used is STM32C8T6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721691655.3U CN207540700U (en) | 2017-12-07 | 2017-12-07 | A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721691655.3U CN207540700U (en) | 2017-12-07 | 2017-12-07 | A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207540700U true CN207540700U (en) | 2018-06-26 |
Family
ID=62617316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721691655.3U Active CN207540700U (en) | 2017-12-07 | 2017-12-07 | A kind of road foundation pressure-detecting device for having long distance transmission and anti-interference function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207540700U (en) |
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2017
- 2017-12-07 CN CN201721691655.3U patent/CN207540700U/en active Active
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