CN104880143B - A kind of multi-modal failure detector of bridge-type resistance strain sensor - Google Patents
A kind of multi-modal failure detector of bridge-type resistance strain sensor Download PDFInfo
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- CN104880143B CN104880143B CN201510282146.4A CN201510282146A CN104880143B CN 104880143 B CN104880143 B CN 104880143B CN 201510282146 A CN201510282146 A CN 201510282146A CN 104880143 B CN104880143 B CN 104880143B
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Abstract
The invention provides a kind of multi-modal failure detector of bridge-type resistance strain sensor, under open fault or lead short circuit failure and combinations thereof the fault mode that breaks, bridge-type resistance strain sensor output line carries out prebias by biasing circuit, enter magnifier after filtering out high-frequency signal by Radio frequency interference suppression circuit again, the differential signal of magnifier amplification bridge-type resistance strain sensor output, differential signal after amplification is in level comparison circuit compared with the reference voltage that fault distinguishing reference voltage sets circuit to set, so as to judge the various fault modes of bridge-type resistance strain sensor, eventually through line and circuit realiration logic synthesis, export a logical signal, differentiate whether bridge-type resistance strain sensor breaks down.Component number is few needed for the present invention, is easy to buy, and cost is cheap, can realize the functional diversities of instrument amplifier and can effectively reduce PCB surface product and cost.
Description
Technical field
The present invention relates to a kind of bridge-type resistance strain sensor failure detector.
Background technology
Bridge-type resistance strain sensor is a kind of by the use of metallic elastic body as flexible member, by being affixed to elasticity
Body sensitive part forms Wheatstone bridge, and deformation is converted to the measurement apparatus of electric signal under the excitation of additional power source.Bridge
Formula resistance strain sensor has that excellent static and dynamic performance, high resolution, error are small, measurement range is big, can be in various harsh rings
Worked in border, the advantages that size is small, in light weight, cheap, numerous in variety, be easy to selection and it is a large amount of use, power, pressure,
Weigh, displacement, acceleration, multiple test fields of measurement such as moment of torsion are widely used.
The Wheatstone bridge that bridge-type resistance strain sensor is formed typically has four leads, two power supply signals and two biographies
Sensor output difference signal, open fault and combinations thereof pattern and short trouble and combinations thereof pattern are that common bridge-type resistance should
Become sensor fault mode.Therefore, it is possible to detect various faults mode in industrial and agricultural production, especially Aero-Space etc. pair simultaneously
The high application field of reliability requirement has urgent technical need, but currently known technology can not be to the more of such sensor
Kind mode failure carries out effective detection simultaneously.A kind of patent CN201210176421 " Electric Brake System of Aircraft pressure sensor redundancy dresses
Put and control method " propose the method that whether exceeds fault threshold using discriminating sensor output valve, but be only capable of to some biographies
Sensor broken string open fault is detected, and the open fault and short trouble to Various Complex integrated mode can not effectively differentiate.
The content of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of multi-modal fault detect of bridge-type resistance strain sensor
Device.
The technical solution adopted for the present invention to solve the technical problems is：Including bridge-type resistance strain sensor, biased electrical
Road, Radio frequency interference suppression circuit, magnifier, fault distinguishing reference voltage set circuit, level comparison circuit and line with
Circuit.
Under open fault or lead short circuit failure and combinations thereof the fault mode that breaks, described bridge-type resistance-strain sensing
Device output line carries out prebias by biasing circuit, then enters instrument amplification after filtering out high-frequency signal by Radio frequency interference suppression circuit
Circuit, the differential signal of magnifier amplification bridge-type resistance strain sensor output, the differential signal after amplification is in level
In comparison circuit compared with the reference voltage that fault distinguishing reference voltage sets circuit to set, so as to judge that bridge-type resistance should
Become the various fault modes of sensor, eventually through line and circuit realiration logic synthesis, export a logical signal, differentiate bridge-type
Whether resistance strain sensor breaks down.
The bias voltage of the biasing circuit is bridge-type resistance strain sensor supply voltage.
The Radio frequency interference suppression circuit uses low pass R-C wave filters.
Described bridge-type resistance strain sensor includes force snesor, pressure sensor, weighing sensor, displacement sensing
Device, acceleration transducer and torque sensor.
The beneficial effects of the invention are as follows：
1) it can detect bridge-type resistance strain sensor broken string open fault and combinations thereof pattern；
2) bridge-type resistance strain sensor lead short circuit failure and combinations thereof pattern (power supply and earth short failure be can detect
Except, this failure can cause power protection or burn)；
3) component number is few needed for, and all components are conventional device, is easy to buy, cost is cheap；
4) circuit can be integrated into instrument amplifier, realizes the functional diversities of instrument amplifier and can effectively reduce
PCB surface product and cost.
Brief description of the drawings
Fig. 1 is bridge-type strain transducer total failure mode fault detection method schematic diagram.
In figure, 1-bridge-type resistance strain sensor, 2-biasing circuit, 3-Radio frequency interference suppression circuit, 4-instrument puts
Big circuit, 5-fault distinguishing reference voltage set circuit, 6-level comparison circuit, 7-line and circuit.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples, and the present invention includes but are not limited to following implementations
Example.
As shown in figure 1, system includes bridge-type resistance strain sensor 1, biasing circuit 2, Radio frequency interference suppression circuit 3, instrument
Table amplifying circuit 4, fault distinguishing reference voltage set circuit 5, level comparison circuit 6, line and circuit 7.The present invention's is substantially former
Reason is：When sensor broken string open fault and combinations thereof fault mode or sensor lead short trouble and combinations thereof failure mould
Under formula, biasing circuit 2 plays a part of providing voltage bias, and now Sensor output will be super close to the position of biasing circuit 2
It is out of order and differentiates the scope for the reference voltage that reference voltage is set set by circuit 5, passes through level comparison circuit 6 and line and circuit
7, fault detect can be come out and integrate into logical signal output all the way.
Biasing circuit 2 is used to provide prebias for system, and bias voltage is the supply voltage of bridge-type resistance strain sensor 1,
Larger biasing resistor is chosen by calculating, to ensure that the influence to measurement accuracy is smaller.Radio frequency interference suppression circuit 3 is used to filter
Except the high-frequency signal of amplifier in, typically low pass R-C wave filters are used.Magnifier 4 should for whole bridge-type resistance
Become the core of the signal conditioning circuit of sensor 1, for amplifying the differential signal of the output of bridge-type resistance strain sensor 1, therefore will
Ask magnifier 4 that there is higher common-mode rejection ratio, to ensure the preferable power supply of instrument amplifier in magnifier 4
Characteristic to instrument amplifier power supply, it is necessary to well be filtered.Fault distinguishing reference voltage sets circuit 5 to be used to set accordingly
Reference voltage, datum is provided for rear class level comparison circuit 6.Level comparison circuit 6 is used to sense bridge-type resistance-strain
The various fault modes of device 1 are differentiated, are realized logic synthesis by line and circuit 7, are finally only exported a logical signal,
Differentiate whether bridge-type resistance strain sensor 1 breaks down for late-class circuit.
In this embodiment, above-mentioned bridge-type resistance strain sensor 1 may be force snesor, pressure sensor, weigh
The various sensors such as sensor, displacement transducer, acceleration transducer, torque sensor, but its core sensory package is bridge-type
Resistance strain gage.
In this embodiment, above-mentioned biasing circuit 2 includes resistance R2 and R6, and wherein R2 is pull-up biasing resistor, and R6 is
Pull-down bias resistance, require to calculate according to the bridge arm resistance of bridge-type resistance strain sensor 1, system accuracy and choose R2 and R6 resistances
Value, it is 3M Ω that this embodiment, which chooses R2 and R6 resistances,.
In this embodiment, above-mentioned Radio frequency interference suppression circuit 3 include resistance R3, R5 (R3=R5) and electric capacity C3,
C4, C5, for forming low pass filter (wherein C3=C5, C4 >=10 × C3), filter out high frequency differential mode and common-mode noise.It is wherein poor
Mode filter cut-off frequency is：
Common-mode filter cut-off frequency is：
In this embodiment, magnifier 4 includes instrument amplifier AD620, C1, C2, C6, C7 and R4.C1、C2、
C6, C7 are electric source filter circuit, and R4 is instrument amplifier AD620 gain setting resistors.Also other instrument amplifiers can be used,
Such as AD623, AD625, INA321, AD8230.
Above-mentioned fault distinguishing reference voltage set reference voltage set by circuit 5 according to bridge-type resistance strain sensor 1 most
Big output voltage range is configured, and typically leaves certain allowance, and carries out good filtering process, ensures the stabilization of reference voltage
Property.In this embodiment, using the form of electric resistance partial pressure, mainly including R8, R9, R10, R11, C9 and C10, two-way is set to refer to
Voltage is respectively 4V and 6V.Also can be realized in the form of reference voltage chip.
In this embodiment, level comparison circuit 6 is realized using integrated comparator LM239J, can also use other forms
Comparator.
In this embodiment, line is really realized with circuit 7 with integrated comparator LM239J, because LM239J is to open
Output form is leaked, therefore the tunnels of LM239J tetra- need to only be exported to short circuit and LM239J power supplys are pulled upward to by resistance R7.
Claims (4)
1. a kind of multi-modal failure detector of bridge-type resistance strain sensor, including bridge-type resistance strain sensor, biased electrical
Road, Radio frequency interference suppression circuit, magnifier, fault distinguishing reference voltage set circuit, level comparison circuit and line with
Circuit, it is characterised in that：Under lead open fault and combinations thereof pattern, short trouble and combinations thereof pattern, described bridge-type
Resistance strain sensor output line carries out prebias by biasing circuit, and now Sensor output is close to the position of biasing circuit
By beyond the scope of the reference voltage set by fault distinguishing reference voltage setting circuit, bridge can determine whether by level comparison circuit
The various fault modes of formula resistance strain sensor, eventually through line and circuit realiration logic synthesis, a logical signal is exported,
Differentiate whether bridge-type resistance strain sensor breaks down.
2. the multi-modal failure detector of bridge-type resistance strain sensor according to claim 1, it is characterised in that：It is described
The bias voltage of biasing circuit is bridge-type resistance strain sensor supply voltage.
3. the multi-modal failure detector of bridge-type resistance strain sensor according to claim 1, it is characterised in that：It is described
Radio frequency interference suppression circuit uses low pass R-C wave filters.
4. the multi-modal failure detector of bridge-type resistance strain sensor according to claim 1, it is characterised in that：It is described
Bridge-type resistance strain sensor include force snesor or displacement transducer or acceleration transducer or torque sensor.
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| CN201510282146.4A CN104880143B (en) | 2015-05-28 | 2015-05-28 | A kind of multi-modal failure detector of bridge-type resistance strain sensor |
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| CN201510282146.4A CN104880143B (en) | 2015-05-28 | 2015-05-28 | A kind of multi-modal failure detector of bridge-type resistance strain sensor |
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| CN104880143B true CN104880143B (en) | 2017-12-26 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105300449B (en) * | 2015-11-03 | 2018-04-10 | 杭州钛比科技有限公司 | A kind of super low-power consumption passive structures health monitoring systems and method |
| JP6627503B2 (en) * | 2015-12-29 | 2020-01-08 | ティアック株式会社 | Sensor abnormality detection device |
| CN107063410B (en) * | 2017-04-12 | 2019-02-15 | 无锡研测技术有限公司 | Resistance-strain type digital weighing sensor with fault detection |
| JP2021167740A (en) * | 2020-04-09 | 2021-10-21 | ミネベアミツミ株式会社 | Failure detection circuit and detection system |
| CN111623954B (en) * | 2020-04-30 | 2022-04-12 | 中国航天空气动力技术研究院 | Wind tunnel balance bridge fault detection method |
| CN112697343B (en) * | 2021-03-23 | 2021-07-16 | 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 |
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| CN101355313B (en) * | 2008-08-05 | 2011-12-21 | 杭州四达电炉成套设备有限公司 | Self-checking circuit for switching of three-phase rectifier |
| CN102156425B (en) * | 2010-12-20 | 2013-12-04 | 北京航空航天大学 | Device for monitoring health status of welding spot of digital integrated circuit in real time |
| CN103744013B (en) * | 2014-01-21 | 2016-06-22 | 上海新世纪机器人有限公司 | Full-controlled bridge circuit failure diagnosis method |
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| US5440234A (en) * | 1992-10-07 | 1995-08-08 | Nec Corporation | Fault detecting circuit incorporated in semiconductor sensor and effective against any fault having influence on output voltage of a circuit component of the sensor |
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