CN215296515U - Pressure detection system - Google Patents
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Abstract
The application provides a pressure detection system, the system includes: the sensing circuit comprises a bridge circuit and a reference resistor which are connected in series between the positive pole and the negative pole of a reference voltage; wherein: the voltage collector is connected to the output end of the bridge circuit and the voltage collecting end of the reference resistor to collect the output voltage Vo output by the bridge circuit and the voltage Vref of the reference resistor; the data processor is connected with the voltage collector and used for calculating the resistance variable value delta R of the bridge circuit according to Vo, Vref and the resistance value Rc of the reference resistor and determining the pressure value applied to the sensing circuit according to the delta R. In this way, based on the sensing circuit, there are
Therefore, the resistance change value delta R is only related to the ratio of Vo to Vref and Rc, temperature compensation can be adaptively realized as long as the Rc is ensured to be unchanged, the influence of voltage drift caused by temperature is eliminated, and the detection accuracy of the pressure value is improved.
Description
Technical Field
The application relates to the field of pressure detection, in particular to a pressure detection system.
Background
At present, in a pressure test, an ADC (Analog-to-Digital Converter) is usually connected to a voltage output terminal of a wheatstone bridge circuit, so as to directly measure the magnitude of the pressure applied by the output voltage of the wheatstone bridge circuit.
However, when the pressure detection is directly implemented by using the wheatstone bridge circuit, the resistance values of the four arms of the wheatstone bridge change with the change of temperature, so that the output voltage directly acquired has drift. Therefore, in each pressure detection system, the collected output voltage is compensated according to the preset compensation value corresponding to each temperature, so that the output voltage can be attached to the voltage generated only by the external force as much as possible. However, the method cannot completely eliminate the influence of voltage drift caused by temperature, and the accuracy of the detected pressure value is still not high.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the present application is to provide a pressure detection system, so as to eliminate the influence of voltage drift caused by temperature and improve the detection accuracy of a pressure value.
The embodiment of the application provides a pressure detection system, includes: the sensing circuit comprises a bridge circuit and a reference resistor which are connected in series between the positive pole and the negative pole of a reference voltage; the voltage collector is connected to the output end of the bridge circuit and the voltage collecting end of the reference resistor so as to collect the output voltage Vo output by the bridge circuit and the voltage Vref of the reference resistor; the output end of the bridge circuit is positioned in two parallel resistance branches of the bridge circuit and between the two resistors; and the data processor is connected with the voltage collector and used for calculating the resistance variable value of the bridge circuit according to the resistance values of the Vo, the Vref and the reference resistance and determining the pressure value applied to the sensing circuit according to the resistance variable value.
In the above system, since the sensing circuit includes the bridge circuit and the reference resistor connected in series between the positive and negative poles of the reference voltage, the reference resistor can divide the input voltage of the bridge circuit, so that when the external pressure causes the resistance value in the bridge circuit to change, the resistance change value Δ R has:
wherein Vo is the output voltage of bridge circuit output, Vref is the voltage of reference resistance, Rc is the resistance value of reference resistance, thereby can make resistance variation value delta R no longer relevant with the temperature, and then insert bridge circuit's output through voltage collector, and the voltage acquisition end of reference resistance, Vo and Vref can be effectively gathered, and then realize the calculation to delta R, thereby the accurate pressure value of applying on sensing circuit of determining, the influence of the voltage drift that the temperature leads to has been eliminated, the detection precision of pressure value has been improved.
Furthermore, the voltage collector comprises a first voltage collecting module and a second voltage collecting module, and the collecting frequencies of the first voltage collecting module and the second voltage collecting module are synchronous; the first voltage acquisition module is connected to the output end of the bridge circuit to acquire the output voltage Vo output by the bridge circuit; the second voltage acquisition module is connected to a voltage acquisition end of the reference resistor and synchronously acquires the voltage Vref of the reference resistor with the first voltage acquisition module.
In the implementation structure, the voltage acquisition modules with synchronous acquisition frequencies respectively acquire the voltage of the output end of the bridge circuit and the voltage acquisition end of the reference resistor, so that effective acquisition of data can be ensured, and the calculation requirement on the variable value of the resistor in the scheme of the application is met.
Further, the first voltage acquisition module and the second voltage acquisition module are analog-to-digital converters.
In the implementation structure, the voltage acquisition module is used as the analog-to-digital converter, so that voltage signals can be effectively converted from analog signals to digital signals while voltage acquisition is carried out, and the data processor can conveniently carry out operation processing.
Furthermore, the voltage collector also comprises a first signal amplifying circuit; the first voltage acquisition module is connected with the first signal amplification circuit and is connected to the output end of the bridge circuit through the first signal amplification circuit.
Furthermore, the voltage collector also comprises a second signal amplifying circuit; the second voltage acquisition module is connected with the second signal amplification circuit and is connected to the voltage acquisition end of the reference resistor through the second signal amplification circuit.
In the implementation structure, the signal amplification circuit is arranged in front of the voltage acquisition module, so that the acquired voltage signals are firstly amplified through the signal amplification circuit, the gain of the voltage signals is enhanced, and the accuracy of voltage signal identification and conversion is effectively improved.
Further, the voltage collector is a processing chip with an external reference bit; the input port of the processing chip is connected to the output end of the bridge circuit so as to acquire the output voltage Vo output by the bridge circuit; and an external reference bit of the processing chip is connected to a voltage acquisition end of the reference resistor so as to acquire the voltage Vref of the reference resistor.
In the implementation structure, the processing chip with the external reference bit is used as the voltage collector, so that the output voltage Vo output by the bridge circuit can be normally collected, meanwhile, the external reference bit of the processing chip is used for collecting Vref, and synchronous collection of two paths of voltages is realized through one processing chip, so that two paths of voltage collection modules are not required to be configured, the collection frequency of the two paths of voltage collection modules is not required to be specially configured synchronously, and the implementation is simpler and more reliable.
Further, the processing chip is: the internal processing logic is an analog-to-digital converter that outputs a ratio equal to the voltage received at the input port and the voltage accessed by the external reference bit.
Further, the analog-to-digital converter is an SZC900H analog-to-digital converter.
In the implementation structure, the ratio of the voltage received by the input port to the voltage accessed by the external reference bit can be output inside the processing chip according to the internal processing logic, so that the processing time of the data processor is saved.
Furthermore, the voltage collector also comprises a third signal amplifying circuit; the input port of the processing chip is connected with the third signal amplifying circuit and is connected to the output end of the bridge circuit through the third signal amplifying circuit.
In the implementation structure, the signal amplification circuit is arranged in front of the processing chip, so that the acquired voltage signal is amplified by the signal amplification circuit, the gain of the voltage signal is enhanced, and the accuracy of voltage signal identification and conversion is effectively improved.
Further, the reference resistance is a low temperature coefficient resistance.
In the implementation structure, the reference resistor is a low-temperature coefficient resistor, so that the resistance value of the reference resistor is basically not influenced by the change of the external environment temperature, and the accuracy of the calculated resistance variable value can be further ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a wheatstone bridge according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a sensing circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a basic structure of a pressure detection system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a two-path-acquisition pressure detection system according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a more specific two-path acquisition pressure detection system provided in the embodiment of the present application;
fig. 6 is a schematic structural diagram of a pressure detection system with single-channel acquisition according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a more specific pressure detection system with single-pass acquisition according to an embodiment of the present application.
Icon: 1-a sensing circuit; 11-a bridge circuit; 12-a reference resistance; 2-a voltage collector; 21-a first voltage acquisition module; 22-a second voltage acquisition module; 23-a first signal amplification circuit; 24-a second signal amplification circuit; 25-processing the chip; 26-a third signal amplification circuit; and 3, a data processor.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
The first embodiment is as follows:
to facilitate understanding of the solution of the present application, a wheatstone bridge circuit commonly used at present will be described first.
Currently, a wheatstone bridge circuit is often used as a sensing circuit in pressure detection. Referring to fig. 1, the wheatstone bridge circuit is composed of four arms (resistors R1, R2, R3, and R4). When no external force exists, R1, R2, R3, R4, R1, R3 are both R + Δ R in resistance value under external force, R2, R4 are both R — Δ R in resistance value under external force, and Δ R is a resistance variable value under external force.
Then, for the wheatstone bridge circuit shown in fig. 1, there are:
in the above equation, Vo is the output voltage of the bridge circuit, and Vin is the input voltage of the bridge circuit.
In the wheatstone bridge circuit, the resistances of the resistors of the four bridge arms increase or decrease with the increase or decrease of the temperature. Under ideal conditions, assuming a temperature increase Δ T, each resistance value increases by Δ RT, then:
from equation 1-2, Vo is affected by temperature in addition to Vin, and decreases with increasing temperature. Therefore, in the current pressure detection system, a temperature drift compensation operation is also required. However, in any temperature drift compensation operation, the output voltage can only be matched with the voltage generated only by external force as much as possible, and the influence of the voltage drift caused by temperature cannot be completely eliminated.
In the embodiment of the present application, the sensing circuit 1 of the pressure detection system is implemented by using the structure shown in fig. 2.
In the embodiment of the present application, the sensing circuit 1 includes a bridge circuit 11 and a reference resistor 12 connected in series between the positive and negative poles of a reference voltage AVDDR.
In the embodiment of the present application, the bridge circuit 11 is not limited to a specific structure as long as it can realize that the output voltage changes synchronously due to the change in the resistance value when an external force is applied. For example, it may be implemented, but not limited to, using a wheatstone bridge or the like.
In the embodiment of the present application, referring to the sensing circuit 1 shown in fig. 2, for convenience of analysis and understanding, it is still assumed that the resistance values of the four bridge arms are equal to each other, and are all R, that is, the equivalent resistance of the bridge circuit 11 is R. Assuming that the input voltage of the sensing circuit 1 is VDDR, there are:
in the expressions 1-3, Vin is the voltage across the bridge circuit 11, and Rc is the resistance of the reference resistor 12.
And formula 1-3 is substituted into formula 1-1, then:
and the voltage Vref of the reference resistor 12 is:
then, it can be obtained according to formulas 1 to 4 and formulas 1 to 5:
it can be seen that, in the embodiment of the present application, the sensing circuit 1 can convert the resistance variable value Δ R generated when the external force is applied to the resistance value Rc, Vo, and Vref of the reference resistor 12 into a ratio related to the resistance value Rc, Vo, and Vref of the reference resistor 12, so that only the output voltage Vo output by the bridge circuit 11 and the voltage Vref of the reference resistor 12 need to be collected normally, the calculation of the resistance variable value Δ R can be realized by combining the resistance value Rc of the reference resistor 12, and it is not necessary to consider whether the value of Vo is affected by the temperature.
It should be noted that, in the embodiment of the present application, in order to further improve the detection accuracy, the reference resistor 12 may be implemented by using a low temperature coefficient resistor, such as a foil resistor, a thin film resistor, an insert type foil resistor, a metal film resistor, a molded resistor, and the like.
Referring to fig. 3, fig. 3 is a schematic diagram of a basic structure of a pressure detecting system provided in the embodiment of the present application.
In the embodiment of the present application, the pressure detection system further includes a voltage collector 2 and a data processor 3 in addition to the aforementioned sensing circuit 1.
In the embodiment of the present application, the voltage collector 2 is connected to the output end of the bridge circuit 11 and the voltage collecting end of the reference resistor 12 to collect the output voltage Vo output by the bridge circuit 11 and the voltage Vref of the reference resistor 12. The output end of the bridge circuit 11 is located in two parallel resistor branches of the bridge circuit 11, between the two resistors, and the voltage collecting end of the reference resistor 12 is located at two ends of the reference resistor 12 (since the reference resistor 12 is connected to the ground, the voltage collecting end of the reference resistor 12 may also be only the end where the reference resistor 12 is connected to the bridge circuit 11).
In the embodiment of the present application, the data processor 3 is connected to the voltage collector 2, so as to calculate the resistance variable value of the bridge circuit 11 according to the resistance values of Vo, Vref, and the reference resistor 12, and determine the pressure value applied to the sensing circuit 1 according to the resistance variable value.
It should be understood that, in the embodiment of the present application, the processing basis of the data processor 3 is the foregoing equations 1-6. It should also be understood that, in the embodiment of the present application, the determination of the pressure value may be implemented by using various existing manners for determining the pressure value applied to the sensing circuit 1 according to the variable value of the resistance, and the embodiment of the present application is not limited thereto.
It should be noted that, in the embodiment of the present application, the data processor 3 and the voltage collector 2 may be connected through a wired communication or a wireless communication, and the data collected by the voltage collector 2 is transmitted to the data processor 3 for processing.
It should be noted that, in a possible implementation manner of the embodiment of the present application, referring to fig. 4, the voltage collector 2 may include a first voltage collecting module 21 and a second voltage collecting module 22. Wherein:
the first voltage acquisition module 21 is connected to the output end of the bridge circuit 11 to acquire the output voltage Vo output by the bridge circuit 11; the second voltage collecting module 22 is connected to the voltage collecting terminal of the reference resistor 12 to collect the voltage Vref of the reference resistor 12.
It should be understood that in practical applications, the external pressure may not be kept constant in real time, for example, when the holding pressure of the human hand is detected, there is often a slight difference in the pressure generated in the holding state of the human hand at different times. Therefore, in order to accurately detect the pressure at each time point, Vo and Vref at the same time point need to be used for calculation in the embodiment of the present application, so that the first voltage collection module 21 and the second voltage collection module 22 need to be capable of synchronously collecting information at the same time.
Therefore, in the embodiment of the present application, the same acquisition frequency may be configured for the first voltage acquisition module 21 and the second voltage acquisition module 22, and when the voltage acquisition modules are started, the first voltage acquisition module 21 and the second voltage acquisition module 22 are simultaneously controlled to be started, so that it is ensured that the second voltage acquisition module 22 and the first voltage acquisition module 21 perform voltage acquisition synchronously, and the calculation accuracy is ensured.
In the above possible embodiment, the first voltage acquisition module 21 and the second voltage acquisition module 22 may be implemented by using an ADC (Analog to Digital Converter). It should be understood that the voltage signal at the sensing circuit 1 is an analog signal, and the signal required by the data processor 3 is a digital signal, and by using the analog-to-digital converter as the voltage acquisition module, the voltage acquisition can be effectively realized while the voltage signal is converted from the analog signal to the digital signal, so that the data processor 3 can perform operation processing conveniently.
It should be further noted that, in the embodiment of the present application, the voltage collector 2 may further include a first signal amplifying circuit 23, and the first voltage collecting module 21 is connected to the first signal amplifying circuit 23 and is connected to the output end of the bridge circuit 11 through the first signal amplifying circuit 23. Therefore, a tiny voltage signal in the sensing circuit 1 can be amplified, the gain of the voltage signal is enhanced, and the conversion accuracy can be improved when analog-to-digital conversion is carried out.
Similarly, in the embodiment of the present application, the voltage collector 2 may also include a second signal amplifying circuit 24, and the second voltage collecting module 22 is connected to the second signal amplifying circuit 24 and is connected to the voltage collecting terminal of the reference resistor 12 through the second signal amplifying circuit 24.
It should be understood that in the possible embodiment described above, the first signal amplification circuit 23 and the second signal amplification circuit 24 may be provided simultaneously, such as shown with reference to fig. 5. However, in the embodiment of the present application, only one of the signal amplification circuits may be provided, or even no signal amplification circuit may be provided.
It is to be understood that, in order to ensure synchronous acquisition for Vo and Vref, in another possible implementation of the embodiment of the present application, the voltage acquirer 2 may also be implemented with a processing chip 25 having an external reference bit.
Referring to fig. 6, an input port of the processing chip 25 is connected to an output terminal of the bridge circuit 11 to acquire an output voltage Vo output by the bridge circuit 11. And the external reference bit of the processing chip 25 is connected to the voltage collecting terminal of the reference resistor 12 to collect the voltage Vref of the reference resistor 12. At this time, because Vo and Vref are collected based on one processing chip 25, after the processing chip 25 is started, Vo and Vref of the sensing circuit 1 are synchronously input to the input port of the processing chip 25 and the external reference bit, so that synchronous collection of Vo and Vref is realized, and special synchronous configuration of collection frequency is not required.
It will be appreciated that in the above possible embodiment, it may be implemented using a processing chip 25 having at least two outputs, so that the collected Vo and Vref are output together to the data processor 3. For example, a two-channel analog-to-digital converter, such as a 250MSPS analog-to-digital converter, may be used.
Furthermore, in the above possible implementation, the processing chip 25 may also be implemented by an analog-to-digital converter whose internal processing logic outputs a ratio equal to the voltage received at the input port and the voltage accessed by the external reference bit, for example, an analog-to-digital converter of SZC 900H. At this time, the internal processing logic of the processing chip 25 will automatically perform the ratio operation between Vo and Vref, and the output is the ratio between Vo and Vref, thereby saving the processing time of the data processor 3.
Similarly, in the above possible embodiment, the voltage collector 2 may further include a third signal amplifying circuit 26. For example, referring to fig. 7, the input port of the processing chip 25 may be connected to the third signal amplifying circuit 26, and is connected to the output terminal of the bridge circuit 11 through the third signal amplifying circuit 26.
It should be noted that, in the embodiment of the present application, the signal amplifying circuit may be implemented by various common amplifying circuits or amplifiers, and is not limited in the embodiment of the present application.
It should be noted that, in the embodiment of the present application, the data processor 3 may be implemented by various electronic devices or information processing modules with computing functions. For example, the implementation can be realized by devices such as computers, servers and the like.
Pressure provided by the embodiment of the applicationIn the detection system, the sensing circuit 1 includes a bridge circuit 11 and a reference resistor 12 connected in series between the positive and negative poles of a reference voltage, so that the reference resistor 12 can divide the input voltage of the bridge circuit 11, and when an external pressure causes a resistance value in the bridge circuit 11 to change, a resistance change value Δ R is:
wherein Vo is the output voltage of bridge circuit 11 output, Vref is the voltage of reference resistance 12, Rc is the resistance value of reference resistance 12, thereby can make resistance change value delta R no longer relevant with the temperature, and then access bridge circuit 11's output through voltage collector 2, and the voltage acquisition end of reference resistance 12, Vo and Vref can be effectively gathered, and then realize the calculation to delta R, thereby the accurate pressure value of applying on sensing circuit 1 of determining, the influence of the voltage drift that the temperature leads to has been eliminated, the detection precision of pressure value has been improved.
In the embodiments provided in the present application, the units described as separate parts may or may not be physically separate, and some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
Furthermore, the modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
In this context, a plurality means two or more.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A pressure sensing system, comprising:
the sensing circuit comprises a bridge circuit and a reference resistor which are connected in series between the positive pole and the negative pole of a reference voltage;
the voltage collector is connected to the output end of the bridge circuit and the voltage collecting end of the reference resistor so as to collect the output voltage Vo output by the bridge circuit and the voltage Vref of the reference resistor; the output end of the bridge circuit is positioned in two parallel resistance branches of the bridge circuit and between the two resistors;
and the data processor is connected with the voltage collector and used for calculating the resistance variable value of the bridge circuit according to the resistance values of the Vo, the Vref and the reference resistance and determining the pressure value applied to the sensing circuit according to the resistance variable value.
2. The pressure detection system of claim 1, wherein the voltage collector comprises a first voltage collection module and a second voltage collection module, and the first voltage collection module and the second voltage collection module are synchronized in collection frequency;
the first voltage acquisition module is connected to the output end of the bridge circuit to acquire the output voltage Vo output by the bridge circuit;
the second voltage acquisition module is connected to a voltage acquisition end of the reference resistor and synchronously acquires the voltage Vref of the reference resistor with the first voltage acquisition module.
3. The pressure detection system of claim 2, wherein the first and second voltage acquisition modules are analog-to-digital converters.
4. The pressure detection system of claim 2, wherein the voltage collector further comprises a first signal amplification circuit;
the first voltage acquisition module is connected with the first signal amplification circuit and is connected to the output end of the bridge circuit through the first signal amplification circuit.
5. The pressure detection system of claim 2, wherein the voltage collector further comprises a second signal amplification circuit;
the second voltage acquisition module is connected with the second signal amplification circuit and is connected to the voltage acquisition end of the reference resistor through the second signal amplification circuit.
6. The pressure detection system of claim 1, wherein the voltage collector is a processing chip having an external reference bit;
the input port of the processing chip is connected to the output end of the bridge circuit so as to acquire the output voltage Vo output by the bridge circuit;
and an external reference bit of the processing chip is connected to a voltage acquisition end of the reference resistor so as to acquire the voltage Vref of the reference resistor.
7. The pressure detection system of claim 6, wherein the processing chip is: the internal processing logic is an analog-to-digital converter that outputs a ratio equal to the voltage received at the input port and the voltage accessed by the external reference bit.
8. The pressure detection system of claim 7, wherein the analog-to-digital converter is a SZC900H analog-to-digital converter.
9. The pressure detection system of claim 6, wherein the voltage collector further comprises a third signal amplification circuit;
the input port of the processing chip is connected with the third signal amplifying circuit and is connected to the output end of the bridge circuit through the third signal amplifying circuit.
10. The pressure sensing system of any of claims 1-9, wherein the reference resistance is a low temperature coefficient resistance.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878033A (en) * | 2022-03-29 | 2022-08-09 | 深圳国微感知技术有限公司 | Matrix type pressure distribution measuring system and method |
| CN115096348A (en) * | 2022-08-26 | 2022-09-23 | 成都晨电智能科技有限公司 | Full-bridge temperature drift compensation circuit and method and strain sensing system |
| CN115183918A (en) * | 2022-07-20 | 2022-10-14 | 无锡芯感智半导体有限公司 | Temperature compensation bridge balance structure suitable for MEMS pressure sensor |
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2021
- 2021-05-21 CN CN202121109630.4U patent/CN215296515U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878033A (en) * | 2022-03-29 | 2022-08-09 | 深圳国微感知技术有限公司 | Matrix type pressure distribution measuring system and method |
| CN114878033B (en) * | 2022-03-29 | 2023-12-22 | 深圳国微感知技术有限公司 | Matrix type pressure distribution measurement system and method |
| CN115183918A (en) * | 2022-07-20 | 2022-10-14 | 无锡芯感智半导体有限公司 | Temperature compensation bridge balance structure suitable for MEMS pressure sensor |
| CN115096348A (en) * | 2022-08-26 | 2022-09-23 | 成都晨电智能科技有限公司 | Full-bridge temperature drift compensation circuit and method and strain sensing system |
| CN115096348B (en) * | 2022-08-26 | 2022-11-22 | 成都晨电智能科技有限公司 | Full-bridge temperature drift compensation circuit and method and strain sensing system |
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