CN204718715U - Intelligent pressure sensing testing system - Google Patents

Intelligent pressure sensing testing system Download PDF

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Publication number
CN204718715U
CN204718715U CN201520442525.0U CN201520442525U CN204718715U CN 204718715 U CN204718715 U CN 204718715U CN 201520442525 U CN201520442525 U CN 201520442525U CN 204718715 U CN204718715 U CN 204718715U
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CN
China
Prior art keywords
operational amplifier
chip microcomputer
module
input
inverting input
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201520442525.0U
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Chinese (zh)
Inventor
吴冬燕
卜树坡
蒋爱如
石瑞华
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Suzhou Institute of Industrial Technology
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Suzhou Institute of Industrial Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority to CN201520442525.0U priority Critical patent/CN204718715U/en
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Publication of CN204718715U publication Critical patent/CN204718715U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

The utility model discloses a kind of intelligent pressure sensing testing system, comprise single-chip microcomputer, AD conversion module, display module, temperature compensation module and signal conditioning circuit; Signal conditioning circuit detects the capacitance of tested sensor equivalent capacity and nurses one's health, single-chip microcomputer is transferred to by AD conversion module, single-chip microcomputer accepts the temperature data of temperature compensation module input simultaneously, temperature compensated, by final pressure data by display module output display; The utility model can realize deviation electric capacity auto-compensation and regulate, and has higher antijamming capability.

Description

Intelligent pressure sensing testing system
Technical field
The utility model relates to a kind of intelligent pressure sensing testing system.
Background technology
Traditional pressure transducer is wanted to improve performance, will drop into higher cost, because the raw material variety made has a lot.After performance improves, the process of making just requires very strict; Non-linear the causing of system drifts about in time; Environmental change also can have influence on the change of basic parameter; Components and parts signal to noise ratio (S/N ratio) is not high, is that it is subject to the principal element that noise causes unstable result; The existence of cross sensitivity result in the low poor performance with selecting of resolution of sensor.These factors just result in sensor reliability can poor, the defect such as accuracy is low, performance is stable not.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, provides a kind of intelligent pressure sensing testing system, can realize deviation electric capacity auto-compensation and regulate, and have higher antijamming capability.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: intelligent pressure sensing testing system, comprises single-chip microcomputer, AD conversion module, display module, temperature compensation module and signal conditioning circuit; Signal conditioning circuit detects the capacitance of tested sensor equivalent capacity and nurses one's health, single-chip microcomputer is transferred to by AD conversion module, single-chip microcomputer accepts the temperature data of temperature compensation module input simultaneously, temperature compensated, by final pressure data by display module output display;
Described signal conditioning circuit comprises: differential amplifier A 3A, be connected to the first differential circuit of the inverting input of differential amplifier A 3A and be connected to second differential circuit of in-phase input end of differential amplifier A 3A; Described first differential circuit and the second differential circuit include respective respectively: the first operational amplifier, the second operational amplifier and multiplier; An input end of described multiplier is connected with the voltage source Us for pumping signal modulate circuit, the control signal that another input end exports with single-chip microcomputer is connected, be connected with the inverting input of the first operational amplifier after the output terminal series capacitor Cm of multiplier, cross-over connection resistance R1 between the inverting input of the first operational amplifier and the output terminal of the first operational amplifier; An electrode of tested sensor equivalent condenser is connected with voltage source Us, and another electrode is connected with the inverting input of the first operational amplifier; Be connected with the inverting input of the second operational amplifier after the output terminal resistance in series R2 of the first operational amplifier, cross-over connection resistance Rf between the inverting input of the second operational amplifier and the output terminal of the second operational amplifier; The in-phase input end of the first operational amplifier, the in-phase input end of the second operational amplifier ground connection respectively.
Be provided with digital filtering module in described single-chip microcomputer, AD conversion module is by present data transmission to the digital filtering module in single-chip microcomputer, and single-chip microcomputer carries out pressure result calculating by removing the data after disturbing in conjunction with temperature data.
Described display module adopts LCD1602 escope.
Described temperature compensation module adopts DS18B20 type temperature compensation module.
Compared with prior art, the utility model reaches beneficial effectbe: adopt negative-feedback technology to automatically adjust to control signal, realize regulating the auto-compensation of deviation electric capacity, and adopt the mode of variate to eliminate the interference of zero point drift, common mode interference and other uncertain factor, circuit is made to have higher antijamming capability, make circuit more stable, measuring accuracy is higher; Structure is simple, with low cost, is convenient to marketing; Arrange digital filtering module, the interference in the digital signal exported with filtering AD conversion module, improves measuring accuracy further.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
As shown in Figure 1, be circuit diagram of the present utility model, intelligent pressure sensing testing system, comprises single-chip microcomputer, AD conversion module, display module, temperature compensation module and signal conditioning circuit; Signal conditioning circuit detects the capacitance of tested sensor equivalent capacity and nurses one's health, single-chip microcomputer is transferred to by AD conversion module, single-chip microcomputer accepts the temperature data of temperature compensation module input simultaneously, temperature compensated, by final pressure data by display module output display.The utility model adopts differential capacitance sensor, and tested sensor is equivalent to capacitor C1 and capacitor C2.
Signal conditioning circuit comprises: differential amplifier A 3A, be connected to the first differential circuit of the inverting input of differential amplifier A 3A and be connected to second differential circuit of in-phase input end of differential amplifier A 3A.
First differential circuit comprises: the first operational amplifier A 1A, the second operational amplifier A 2A and multiplier M1; An input end of multiplier M1 is connected with the voltage source Us for pumping signal modulate circuit, the control signal Uc1 that another input end exports with single-chip microcomputer is connected, be connected with the inverting input of the first operational amplifier A 1A after the output terminal series capacitor Cm of multiplier M1, cross-over connection resistance R1 between the inverting input of the first operational amplifier A 1A and the output terminal of the first operational amplifier A 1A; An electrode of tested sensor equivalent condenser C1 is connected with voltage source Us, and another electrode is connected with the inverting input of the first operational amplifier A 1A; Be connected with the inverting input of the second operational amplifier A 2A after the output terminal resistance in series R2 of the first operational amplifier A 1A, cross-over connection resistance Rf between the inverting input of the second operational amplifier A 2A and the output terminal of the second operational amplifier A 2A; The in-phase input end of the first operational amplifier A 1A, the in-phase input end of the second operational amplifier A 2A ground connection respectively.
Second differential circuit comprises: the first operational amplifier A 1B, the second operational amplifier A 2B and multiplier M2; An input end of multiplier M2 is connected with the voltage source Us for pumping signal modulate circuit, the control signal that another input end exports with single-chip microcomputer is connected, be connected with the inverting input of the first operational amplifier A 1B after the output terminal series capacitor Cm of multiplier M2, cross-over connection resistance R1 between the inverting input of the first operational amplifier A 1B and the output terminal of the first operational amplifier A 1B; An electrode of tested sensor equivalent condenser C2 is connected with voltage source Us, and another electrode is connected with the inverting input of the first operational amplifier A 1B; Be connected with the inverting input of the second operational amplifier A 2B after the output terminal resistance in series R2 of the first operational amplifier A 1B, cross-over connection resistance Rf between the inverting input of the second operational amplifier A 2B and the output terminal of the second operational amplifier A 2B; The in-phase input end of the first operational amplifier A 1B, the in-phase input end of the second operational amplifier A 2B ground connection respectively.
Be provided with digital filtering module in single-chip microcomputer, AD conversion module is by present data transmission to the digital filtering module in single-chip microcomputer, and single-chip microcomputer carries out pressure result calculating by removing the data after disturbing in conjunction with temperature data.
Preferably, display module adopts LCD1602 escope, and temperature compensation module adopts DS18B20 type temperature compensation module.
The above is only preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model know-why; can also make some improvement and distortion, these improve and distortion also should be considered as protection domain of the present utility model.

Claims (4)

1. intelligent pressure sensing testing system, is characterized in that, comprises single-chip microcomputer, AD conversion module, display module, temperature compensation module and signal conditioning circuit; Signal conditioning circuit detects the capacitance of tested sensor equivalent capacity and nurses one's health, single-chip microcomputer is transferred to by AD conversion module, single-chip microcomputer accepts the temperature data of temperature compensation module input simultaneously, temperature compensated, by final pressure data by display module output display;
Described signal conditioning circuit comprises: differential amplifier A 3A, be connected to the first differential circuit of the inverting input of differential amplifier A 3A and be connected to second differential circuit of in-phase input end of differential amplifier A 3A; Described first differential circuit and the second differential circuit include respective respectively: the first operational amplifier, the second operational amplifier and multiplier; An input end of described multiplier is connected with the voltage source Us for pumping signal modulate circuit, the control signal that another input end exports with single-chip microcomputer is connected, be connected with the inverting input of the first operational amplifier after the output terminal series capacitor Cm of multiplier, cross-over connection resistance R1 between the inverting input of the first operational amplifier and the output terminal of the first operational amplifier; An electrode of tested sensor equivalent condenser is connected with voltage source Us, and another electrode is connected with the inverting input of the first operational amplifier; Be connected with the inverting input of the second operational amplifier after the output terminal resistance in series R2 of the first operational amplifier, cross-over connection resistance Rf between the inverting input of the second operational amplifier and the output terminal of the second operational amplifier; The in-phase input end of the first operational amplifier, the in-phase input end of the second operational amplifier ground connection respectively.
2. intelligent pressure sensing testing system according to claim 1, it is characterized in that, digital filtering module is provided with in described single-chip microcomputer, AD conversion module is by present data transmission to the digital filtering module in single-chip microcomputer, and single-chip microcomputer carries out pressure result calculating by removing the data after disturbing in conjunction with temperature data.
3. intelligent pressure sensing testing system according to claim 1, is characterized in that, described display module adopts LCD1602 escope.
4. intelligent pressure sensing testing system according to claim 1, is characterized in that, described temperature compensation module adopts DS18B20 type temperature compensation module.
CN201520442525.0U 2015-06-25 2015-06-25 Intelligent pressure sensing testing system Expired - Fee Related CN204718715U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201520442525.0U CN204718715U (en) 2015-06-25 2015-06-25 Intelligent pressure sensing testing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201520442525.0U CN204718715U (en) 2015-06-25 2015-06-25 Intelligent pressure sensing testing system

Publications (1)

Publication Number Publication Date
CN204718715U true CN204718715U (en) 2015-10-21

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CN201520442525.0U Expired - Fee Related CN204718715U (en) 2015-06-25 2015-06-25 Intelligent pressure sensing testing system

Country Status (1)

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CN (1) CN204718715U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107367639A (en) * 2017-08-31 2017-11-21 京东方科技集团股份有限公司 Capacitance measurement method and device
CN111122020A (en) * 2019-12-31 2020-05-08 中国科学院微电子研究所 Capacitive pressure detection device and sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107367639A (en) * 2017-08-31 2017-11-21 京东方科技集团股份有限公司 Capacitance measurement method and device
CN107367639B (en) * 2017-08-31 2019-12-24 京东方科技集团股份有限公司 Capacitance value measuring method and apparatus
CN111122020A (en) * 2019-12-31 2020-05-08 中国科学院微电子研究所 Capacitive pressure detection device and sensor

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GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20151021

Termination date: 20160625