CN113311365A - Pressure sensor broken string detection circuitry - Google Patents
Pressure sensor broken string detection circuitry Download PDFInfo
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- CN113311365A CN113311365A CN202110609636.6A CN202110609636A CN113311365A CN 113311365 A CN113311365 A CN 113311365A CN 202110609636 A CN202110609636 A CN 202110609636A CN 113311365 A CN113311365 A CN 113311365A
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- 238000001514 detection method Methods 0.000 title claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002159 abnormal effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The invention discloses a pressure sensor disconnection detection circuit, which relates to the field of detection circuits and comprises: the disconnection point module is used for connecting voltage input and transmitting a voltage signal; the dual-path operational amplifier module is used for ensuring the stability of the signal level output to the switch module; the switch module is used for conducting a circuit; the processing module is used for judging whether the four signal wires of the pressure sensor are disconnected or not, and which wire is disconnected; compared with the prior art, the invention has the beneficial effects that: the invention determines the broken line positions of a plurality of strain gauge pressure sensors by detecting the voltage values of signal line connection points in the strain gauge pressure sensors connected in a full-bridge manner. The production abnormity caused by the broken line of the sensor circuit in the production process can be solved, and the potential safety hazard can be found in time in some applications.
Description
Technical Field
The invention relates to the field of detection circuits, in particular to a pressure sensor disconnection detection circuit.
Background
Strain gage pressure sensors operate on the principle of resistive strain effects. The resistance value of the resistance strain gauge changes when the resistance strain gauge deforms due to pulling or compression, the bridge arm is asymmetric due to the resistance change of the strain arm in the internal bridge type resistance structure, corresponding millivolt-level small signal voltage is obtained and output, and the small signal voltage is connected to a special pressure detection instrument and is converted into a corresponding pressure value.
When the pressure sensor is connected with an excitation source line of a pressure detection instrument or any one of 4 lines such as a signal line is broken in the use process, the actual pressure condition of the instrument cannot be accurately fed back by pressure, a user cannot know the abnormal use condition of equipment at the first time, abnormal production is caused, and improvement is needed.
Disclosure of Invention
The present invention is directed to a circuit for detecting a broken wire of a pressure sensor, so as to solve the problems of the related art.
In order to achieve the purpose, the invention provides the following technical scheme:
a pressure sensor disconnection detection circuit comprising:
the disconnection point module is used for connecting voltage input and transmitting a voltage signal;
the dual-path operational amplifier module is used for ensuring the stability of the signal level output to the switch module;
the switch module is used for conducting a circuit;
the processing module is used for judging whether the four signal wires of the pressure sensor are disconnected or not, and which wire is disconnected;
the output end of the disconnection point module is connected with the input end of the double-path operational amplifier module, the output end of the double-path operational amplifier module is connected with the input end of the switch module, and the output end of the switch module is connected with the input end of the processing module.
As a still further scheme of the invention: the disconnection point module comprises a pressure sensor X, a first end of the pressure sensor X is connected with a positive electrode of a power supply, a second end of the pressure sensor X is connected with a negative electrode of the power supply, a third end of the pressure sensor X is connected with an input end of the double-path operational amplifier module, and a fourth end of the pressure sensor X is connected with an input end of the double-path operational amplifier module.
As a still further scheme of the invention: the two-way operational amplifier module comprises ｃA resistor R1, ｃA resistor R2, ｃA resistor R3, ｃA resistor R4, ｃA resistor R5, ｃA resistor R6, ｃA resistor R7, ｃA resistor R8, an amplifier OP-A and an amplifier OP-B, the third end of the pressure sensor X is connected with the resistor R1 and the in-phase end of the amplifier OP-A, the fourth end of the pressure sensor X is connected with the resistor R3 and the amplifier OP-B, the other end of the resistor R1 is grounded, the other end of the resistor R3 is grounded, the inverting end of the amplifier OP-A is connected with the resistor R2, the other end of the resistor R2 is connected with the output end of the amplifier OP-A and the resistor R5, the inverting end of the amplifier OP-B is connected with the resistor R4, the other end of the resistor R4 is connected with the output end of the amplifier OP-B and the resistor R7, the other end of the resistor R5 is connected with the resistor R6 and the input end of the switch module, the other end of the resistor R6 is grounded, and the other end of the resistor R7 is connected with the resistor R686R 9R 9, The input end of the switch module and the other end of the resistor R8 are grounded.
As a still further scheme of the invention: the switch module comprises a switch S1 and a switch S8, the other end of the resistor R5 is connected with the switch S1, the other end of the switch S1 is connected with the input end of the processing module, the other end of the resistor R7 is connected with the switch S8, and the other end of the switch S8 is connected with the input end of the processing module.
As a still further scheme of the invention: the processing module is composed of a chip MCU, and an ADC interface of the chip MCU is connected with the switch S1 and the switch S8.
As a still further scheme of the invention: the first end of the pressure sensor X is connected with the anode of the 5V power supply, and the second end of the pressure sensor X is connected with the cathode of the 5V power supply.
As a still further scheme of the invention: the model of the amplifiers OP-A and OP-B is AD 8606.
Compared with the prior art, the invention has the beneficial effects that: the invention determines the broken line positions of a plurality of strain gauge pressure sensors by detecting the voltage values of signal line connection points in the strain gauge pressure sensors connected in a full-bridge manner. The production abnormity caused by the broken line of the sensor circuit in the production process can be solved, and the potential safety hazard can be found in time in some applications.
Drawings
Fig. 1 is a schematic diagram of a pressure sensor disconnection detection circuit.
Fig. 2 is a circuit diagram of a pressure sensor disconnection detection circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
Referring to fig. 1, a circuit for detecting a broken wire of a pressure sensor includes:
the disconnection point module is used for connecting voltage input and transmitting a voltage signal;
the dual-path operational amplifier module is used for ensuring the stability of the signal level output to the switch module;
the switch module is used for conducting a circuit;
the processing module is used for judging whether the four signal wires of the pressure sensor are disconnected or not, and which wire is disconnected;
the output end of the disconnection point module is connected with the input end of the double-path operational amplifier module, the output end of the double-path operational amplifier module is connected with the input end of the switch module, and the output end of the switch module is connected with the input end of the processing module.
In this embodiment: referring to fig. 2, the disconnection point module includes a pressure sensor X, a first end of the pressure sensor X is connected to a positive electrode of the power supply, a second end of the pressure sensor X is connected to a negative electrode of the power supply, a third end of the pressure sensor X is connected to an input end of the dual-path operational amplifier module, and a fourth end of the pressure sensor X is connected to an input end of the dual-path operational amplifier module.
When the four signal lines of the pressure sensor X are disconnected, the voltages output to the amplifiers OP- ｃA and OP-B are changed.
In this embodiment: referring to fig. 2, the dual-path operational amplifier module includes ｃA resistor R1, ｃA resistor R2, ｃA resistor R3, ｃA resistor R4, ｃA resistor R5, ｃA resistor R6, ｃA resistor R7, ｃA resistor R8, an amplifier OP- ｃA, and an amplifier OP-B, ｃA third terminal of the pressure sensor X is connected to the resistor R1 and ｃA non-inverting terminal of the amplifier OP- ｃA, ｃA fourth terminal of the pressure sensor X is connected to the resistor R3 and the amplifier OP-B, another terminal of the resistor R1 is grounded, another terminal of the resistor R3 is grounded, an inverting terminal of the amplifier OP- ｃA is connected to the resistor R2, another terminal of the resistor R2 is connected to an output terminal of the amplifier OP- ｃA and the resistor R5, an inverting terminal of the amplifier OP-B is connected to the resistor R4, another terminal of the resistor R4 is connected to an output terminal of the amplifier OP-B and the resistor R7, another terminal of the resistor R5 is connected to the resistor R6 and an input terminal of the switch module, another terminal of the resistor R6 is grounded, the other end of the resistor R7 is connected with the resistor R8 and the input end of the switch module, and the other end of the resistor R8 is grounded.
In the invention, the input voltage of the non-inverting terminal of the amplifier OP-A and the amplifier OP-B is the output terminal voltage of the amplifier OP-A and the amplifier OP-B.
In this embodiment: referring to fig. 2, the switch module includes a switch S1 and a switch S8, the other end of the resistor R5 is connected to the switch S1, the other end of the switch S1 is connected to the input terminal of the processing module, the other end of the resistor R7 is connected to the switch S8, and the other end of the switch S8 is connected to the input terminal of the processing module.
The switches S1 and S2 are used to control the circuit to be conductive and provide a path in the present invention.
In this embodiment: referring to fig. 2, the processing module is composed of a chip MCU, and an ADC interface of the chip MCU is connected to the switch S1 and the switch S8.
The ADC interface (a plurality of ADC interfaces) of the chip MCU receives the voltage signals input from the switches S1 and S8, and determines whether or not the disconnection point of the pressure sensor X is disconnected according to the input voltage signals, and if so, which disconnection point is the disconnection point.
In this embodiment: the first end of the pressure sensor X is connected with the anode of the 5V power supply, and the second end of the pressure sensor X is connected with the cathode of the 5V power supply.
The disconnection point is judged by comparing the voltage at the output end of the sense amplifier OP-A, OP-B with the voltage of 5V.
In this embodiment: the model of the amplifiers OP-A and OP-B is AD 8606.
The amplifier AD8606 is a double-path single-power amplifier, and has the characteristics of extremely low offset voltage, low input voltage and current noise, wide signal bandwidth and the like.
The working principle of the invention is as follows: the No. 1 port of the pressure sensor X is connected with the anode of a 5V power supply, and the No. 2 port of the pressure sensor X is connected with the cathode of the 5V power supply;
1. if the output voltage values of the amplifiers OP-A, OP-B are all 0, the voltage detected by the ADC port of the chip MCU is 0 and is less than 2.5V under the normal condition of the circuit, the disconnection can be judged, and the disconnection point is deduced to be an E + position;
2. if the output voltage value of the amplifier OP-A is 2.5V, the output voltage value of the amplifier OP-B is 0, the output voltage of the amplifier OP-A is normal, the output voltage of the amplifier OP-B is abnormal and is less than the normal value by 2.5V, the disconnection can be judged, and the disconnection point is inferred to be an S-position;
3. if the output voltage value of the amplifier OP-A is 0V, the output voltage value of the amplifier OP-B is 2.5V, the output voltage of the amplifier OP-A is abnormal and is 2.5V smaller than the normal value, and the output voltage of the amplifier OP-B is normal, the disconnection can be judged, and the disconnection point is inferred to be the S + position;
4. if the output voltage value of the amplifier OP-A is 5V, the output voltage value of the amplifier OP-B is 5, the output voltage of the amplifier OP-A is abnormal and is 2.5V larger than the normal value, the output voltage of the amplifier OP-B is abnormal and is 2.5V larger than the normal value, the disconnection can be judged, and the disconnection point is inferred to be an E-position;
when a plurality of break points occur, other broken lines can be deduced by comparing the condition with a normal voltage value, including two lines, multiple lines, broken lines and the like.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A pressure sensor disconnection detection circuit, characterized by:
this pressure sensor disconnection detection circuit includes:
the disconnection point module is used for connecting voltage input and transmitting a voltage signal;
the dual-path operational amplifier module is used for ensuring the stability of the signal level output to the switch module;
the switch module is used for conducting a circuit;
the processing module is used for judging whether the four signal wires of the pressure sensor are disconnected or not, and which wire is disconnected;
the output end of the disconnection point module is connected with the input end of the double-path operational amplifier module, the output end of the double-path operational amplifier module is connected with the input end of the switch module, and the output end of the switch module is connected with the input end of the processing module.
2. The pressure sensor disconnection detection circuit of claim 1, wherein the disconnection point module comprises a pressure sensor X, a first end of the pressure sensor X is connected to a positive electrode of a power supply, a second end of the pressure sensor X is connected to a negative electrode of the power supply, a third end of the pressure sensor X is connected to an input end of the dual-path operational amplifier module, and a fourth end of the pressure sensor X is connected to an input end of the dual-path operational amplifier module.
3. The circuit for detecting disconnection of ｃA pressure sensor according to claim 1, wherein the dual-path operational amplifier module comprises ｃA resistor R1, ｃA resistor R2, ｃA resistor R3, ｃA resistor R4, ｃA resistor R5, ｃA resistor R6, ｃA resistor R7, ｃA resistor R8, an amplifier OP- ｃA, and an amplifier OP-B, the third terminal of the pressure sensor X is connected with the resistor R1 and the non-inverting terminal of the amplifier OP- ｃA, the fourth terminal of the pressure sensor X is connected with the resistor R3 and the amplifier OP-B, the other terminal of the resistor R1 is grounded, the other terminal of the resistor R3 is grounded, the inverting terminal of the amplifier OP- ｃA is connected with the resistor R2, the other terminal of the resistor R2 is connected with the output terminal of the amplifier OP- ｃA and the resistor R5, the inverting terminal of the amplifier OP-B is connected with the resistor R4, the other terminal of the resistor R4 is connected with the output terminal of the amplifier OP-B and the resistor R7, and the other terminal of the resistor R5 is connected with the resistor R6, The other end of the resistor R6 is grounded, the other end of the resistor R7 is connected with the resistor R8 and the input end of the switch module, and the other end of the resistor R8 is grounded.
4. The pressure sensor disconnection detecting circuit of claim 1, wherein the switch module comprises a switch S1 and a switch S8, the other end of the resistor R5 is connected to the switch S1, the other end of the switch S1 is connected to the input terminal of the processing module, the other end of the resistor R7 is connected to the switch S8, and the other end of the switch S8 is connected to the input terminal of the processing module.
5. The circuit of claim 1, wherein the processing module is formed by a chip MCU, and the ADC interface of the chip MCU is connected to the switch S1 and the switch S8.
6. The circuit for detecting disconnection of a pressure sensor according to claim 2, wherein a first terminal of the pressure sensor X is connected to a positive terminal of a 5V power supply, and a second terminal of the pressure sensor X is connected to a negative terminal of the 5V power supply.
7. The pressure sensor disconnection detecting circuit of claim 3, wherein the type of the amplifier OP-A and the type of the amplifier OP-B are AD 8606.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110609636.6A CN113311365A (en) | 2021-06-01 | 2021-06-01 | Pressure sensor broken string detection circuitry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110609636.6A CN113311365A (en) | 2021-06-01 | 2021-06-01 | Pressure sensor broken string detection circuitry |
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| CN113311365A true CN113311365A (en) | 2021-08-27 |
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| CN202110609636.6A Pending CN113311365A (en) | 2021-06-01 | 2021-06-01 | Pressure sensor broken string detection circuitry |
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|---|---|---|---|---|
| JP2001091384A (en) * | 1999-09-27 | 2001-04-06 | Matsushita Electric Works Ltd | Bridge sensor with function of detecting breaking of wire |
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| CN210603570U (en) * | 2019-10-15 | 2020-05-22 | 林玉胜 | Be applied to and detect foil gage pressure sensor broken string circuit |
| CN111474401A (en) * | 2020-04-27 | 2020-07-31 | 长园共创电力安全技术股份有限公司 | High-voltage charged display device with fault detection function and fault detection method |
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| CN112216549A (en) * | 2020-09-22 | 2021-01-12 | 陕西西高开关有限责任公司 | Online intelligent compensation system for contact pressure of high-voltage circuit breaker |
| CN112697343A (en) * | 2021-03-23 | 2021-04-23 | 上海艾为微电子技术有限公司 | Detection circuit and method of resistance bridge type pressure sensor, electronic equipment and chip |
-
2021
- 2021-06-01 CN CN202110609636.6A patent/CN113311365A/en active Pending
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001091384A (en) * | 1999-09-27 | 2001-04-06 | Matsushita Electric Works Ltd | Bridge sensor with function of detecting breaking of wire |
| JP2001183165A (en) * | 1999-10-13 | 2001-07-06 | Denso Corp | Sensor abnormality detecting circuit and physical quantity detecting device |
| JP2004245705A (en) * | 2003-02-14 | 2004-09-02 | Orc Mfg Co Ltd | Sensor device |
| CN101732044A (en) * | 2008-11-13 | 2010-06-16 | 深圳迈瑞生物医疗电子股份有限公司 | Bridge-type pressure sensor detection circuit, detection method and monitor |
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