CN107063410B - Resistance-strain type digital weighing sensor with fault detection - Google Patents
Resistance-strain type digital weighing sensor with fault detection Download PDFInfo
- Publication number
- CN107063410B CN107063410B CN201710235287.XA CN201710235287A CN107063410B CN 107063410 B CN107063410 B CN 107063410B CN 201710235287 A CN201710235287 A CN 201710235287A CN 107063410 B CN107063410 B CN 107063410B
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- resistance
- bridge
- equiarm
- lead
- full
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- 238000005303 weighing Methods 0.000 title claims abstract description 61
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 239000004575 stone Substances 0.000 claims abstract description 30
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 35
- 230000005611 electricity Effects 0.000 claims description 12
- 230000015556 catabolic process Effects 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 230000001419 dependent Effects 0.000 claims description 2
- 230000000875 corresponding Effects 0.000 description 3
- 229920002574 CR-39 Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000011888 foil Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/13—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing having piezo-electric or piezo-resistive properties
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G23/00—Auxiliary devices for weighing apparatus
- G01G23/01—Testing or calibrating of weighing apparatus
Abstract
The present invention relates to a kind of resistance-strain type digital weighing sensor with fault detection, it includes measuring circuit, measuring circuit uses favour stone full-bridge equiarm circuit, the first input lead, the second input lead, the first output lead and the second output lead are set on favour stone full-bridge equiarm circuit, full-bridge equiarm output voltage U can be obtained by the first output lead, the second output leado；It further include the weighing processor for signal processing, the weighing processor obtains bridge arm output voltage U by the first output lead and the second input leado1；Processor weigh to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1First differential is carried out, and utilizes full-bridge equiarm output voltage UoFirst differential, bridge arm output voltage Uo1First differential size relation carry out fault detection judgement.The present invention is not only able to achieve required weight measurement, moreover it is possible to which whether real-time detection weighing sensor breaks down, securely and reliably.
Description
Technical field
The present invention relates to a kind of digital weighing sensor, especially a kind of resistance-strain type number with fault detection claims
Sensor is retransmitted, the technical field of weighing sensor is belonged to.
Background technique
Currently, it is favour stone full-bridge equiarm electricity that the measuring circuit that resistance-strain chip weighing sensor uses is said all absolutely mostly
Road.When weighing sensor is under pressure, part strain sheet resistance become larger, rest part strain sheet resistance become smaller, by favour this
Resistance variations are converted into voltage change by logical full-bridge equiarm circuit, obtain pressure size by being handled output voltage,
It exactly weighs the size of weight.Since favour stone full-bridge equiarm circuit only exports all the way, asked when quality occurs in weighing sensor
Topic (for example foil gauge falls off) can not judge the working condition of sensor only by the data of sensor.
Summary of the invention
The purpose of the present invention is overcoming the deficiencies in the prior art, a kind of resistance-strain with fault detection is provided
Formula digital weighing sensor, it is compact-sized, not only it is able to achieve required weight measurement, moreover it is possible to which real-time detection weighing sensor is
No failure, securely and reliably.
According to technical solution provided by the invention, the resistance-strain type digital weighing sensor with fault detection,
Including the measuring circuit for incuding dependent variable, the measuring circuit uses favour stone full-bridge equiarm circuit, and the favour stone is complete
First input lead, the second input lead, the first output lead and the second output lead are set on bridge equiarm circuit, pass through
One output lead, the second output lead can obtain full-bridge equiarm output voltage Uo；It further include the weighing processing for signal processing
Device, the weighing processor obtain bridge arm output voltage U by the first output lead and the second input leado1；
Processor weigh to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1First differential is carried out, and is utilized
Full-bridge equiarm output voltage UoFirst differential and bridge arm output voltage Uo1First differential size relation carry out fault detection
Judgement.
When processor of weighing carries out breakdown judge, deterministic process includes determining full-bridge equiarm output voltage UoFirst differential with
Bridge arm output voltage Uo1The ratio of first differential, if the ratio is matched with the breakdown judge threshold value in weighing processor,
Weighing processor judges measuring circuit fault-free, otherwise, it is determined that there are failures for measuring circuit.
The favour stone full-bridge equiarm circuit is connect by filter network and adc circuit with weighing processor, favour stone
The first output lead, the second output lead and the second input lead on full-bridge equiarm circuit are connect with filter network, favour
The first input lead, the second input lead on stone full-bridge equiarm circuit are also connect with power module, power module also with ADC
The power end connection of the power end of circuit and processor of weighing.
The favour stone full-bridge equiarm circuit includes the identical resistance R1 of resistance value, resistance R2, resistance R3 and resistance R4, electricity
Resistance R1, resistance R2, resistance R3 and resistance R4 are successively connected with each other, one end of the first input lead and one end of resistance R1 and
The connection of the one end resistance R4, one end of the second input lead are connect with one end of one end of resistance R2 and resistance R3, the first output
One end of lead is connect with the other end of the other end of resistance R1 and resistance R2, and one end of the second output lead is with resistance R3's
The connection of the other end of the other end and resistance R4；
Filter network includes capacitor C1, capacitor C2, capacitor C3 and capacitor C4；The one of one end of capacitor C1 and capacitor C2
End connect with the other end of the first output lead, the other end of the second output lead and one end of capacitor C3 and capacitor C4's
Other end connection；The other end of capacitor C1, the other end of capacitor C2, the other end of the other end of capacitor C3 and capacitor C4 are mutual
It is connect after connection with the second input lead.
Storage unit and the data transmission module for data transmission are connected on the weighing processor.
The data transmission module includes RS485 interface circuit.
Advantages of the present invention: weighing processor is to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1Carry out one
Rank differential, and utilize full-bridge equiarm output voltage UoFirst differential, bridge arm output voltage Uo1First differential size relation
Fault detection judgement is carried out, required weight measurement is not only able to achieve, moreover it is possible to whether real-time detection weighing sensor breaks down,
Securely and reliably.
Detailed description of the invention
Fig. 1 is the schematic diagram of favour stone full-bridge equiarm circuit of the present invention.
Fig. 2 is structural block diagram of the invention.
Description of symbols: the first input lead of 1-, the second input lead of 2-, the first output lead of 3-, 4- second are exported
Lead, 5- third output lead, 6- filter network, 7-ADC circuit, 8- weighing processor, 9- storage unit, the transmission of 10- data
Module, 11- power module and 12- favour stone full-bridge equiarm circuit.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1: in order to which whether real-time detection weighing sensor breaks down, the present invention includes for incuding strain
The measuring circuit of amount, the measuring circuit uses favour stone full-bridge equiarm circuit 12, on the favour stone full-bridge equiarm circuit 12
First input lead 1, the second input lead 2, the first output lead 3 and the second output lead 4 are set, drawn by the first output
Line 3, the second output lead 4 can obtain full-bridge equiarm output voltage Uo；It further include the weighing processor 8 for signal processing, institute
It states weighing processor 8 and bridge arm output voltage U is obtained by the first output lead 3 and the second input lead 2o1；
Processor 8 weigh to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1Carry out first differential, and benefit
With full-bridge equiarm output voltage UoFirst differential and bridge arm output voltage Uo1First differential size relation carry out failure inspection
Survey judgement.
Specifically, weighing processor 8 can use common micro-chip processor, such as single-chip microcontroller, specifically can be according to need
It is selected, will not enumerate herein.Measuring circuit can be carried out required strain by favour stone full-bridge equiarm circuit 12
Formula measurement is generally connect with external voltage by the first input lead 1, the second input lead 2, is drawn according to the first output
The full-bridge equiarm output voltage Uo of line 3, the second output lead 4, weighing processor 8 can determine that corresponding weighing weight, at weighing
It manages device 8 and determines that the process of weighing weight is known to those skilled in the art, herein no longer according to full-bridge equiarm output voltage Uo
It repeats.
In order to detect to failure, bridge arm output electricity is also obtained by the first output lead 3 and the second input lead 2
Uo1 is pressed, processor 8 of weighing is to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1First differential is carried out, and is utilized
Full-bridge equiarm output voltage UoFirst differential, bridge arm output voltage Uo1First differential size relation carry out fault detection sentence
It is disconnected；Processor 8 of weighing is this to full-bridge equiarm output voltage Uo, bridge arm output voltage the Uo1 detailed process for carrying out first differential
Known to technical field personnel, details are not described herein again.When carrying out fault detection judgement, specifically:
When processor 8 of weighing carries out breakdown judge, deterministic process includes determining full-bridge equiarm output voltage UoFirst differential
With bridge arm output voltage Uo1The ratio of first differential, if the ratio is matched with the breakdown judge threshold value in weighing processor 8,
Processor 8 of then weighing judges measuring circuit fault-free, otherwise, it is determined that there are failures for measuring circuit.
In the embodiment of the present invention, breakdown judge threshold value is generally interval range, ratio and weighing 8 internal fault of processor judgement
Threshold value matching, in particular to ratio are in the range of breakdown judge threshold value.It certainly, in the specific implementation, can also be by full-bridge etc.
Arm output voltage UoFirst differential and bridge arm output voltage Uo1First differential make it is poor, and according to the result of difference with it is corresponding
Breakdown judge threshold value is compared, and the mode specifically compared, which can according to need, carries out selection determination, and details are not described herein again.
As shown in Fig. 2, the favour stone full-bridge equiarm circuit 12 is handled by filter network 6 and adc circuit 7 and weighing
Device 8 connects, the first output lead 3, the second output lead 4 and the second input lead 2 on favour stone full-bridge equiarm circuit 12
It is connect with filter network 6, the first input lead 1, the second input lead 2 on favour stone full-bridge equiarm circuit 12 are gone back and power supply
Module 11 connects, and power module 11 is also connect with the power end of the power end of adc circuit 7 and processor 8 of weighing.
When it is implemented, the favour stone full-bridge equiarm circuit 12 includes the identical resistance R1 of resistance value, resistance R2, resistance R3
And resistance R4, resistance R1, resistance R2, resistance R3 and resistance R4 are successively connected with each other, one end of the first input lead 1 and electricity
Hinder one end and the connection of the one end resistance R4 of R1, the one of one end of the second input lead 2 and one end of resistance R2 and resistance R3
End connection, one end of the first output lead 3 are connect with the other end of the other end of resistance R1 and resistance R2, the second output lead
4 one end is connect with the other end of the other end of resistance R3 and resistance R4；
Filter network 6 includes capacitor C1, capacitor C2, capacitor C3 and capacitor C4；One end of capacitor C1 and capacitor C2's
One end is connect with the other end of the first output lead 3, the other end of the second output lead 4 and one end of capacitor C3 and capacitor
The other end of C4 connects；The other end of capacitor C1, the other end of capacitor C2, the other end of capacitor C3 and capacitor C4 the other end
It is connect after interconnection with the second input lead 2.
In the embodiment of the present invention, the other end of the first output lead 3, the other end of the second output lead 4 and second are defeated
Enter lead 2 to connect with adc circuit 7.Adc circuit 7 can use the common structure type of the art, and power module 11 mentions
For operating voltage needed for entire weighing sensor.When resistance R1, resistance R2, resistance R3 and resistance R4 are sequentially connected, resistance
The both ends of R1 are connect with resistance R2 and resistance R4 respectively, and the both ends of resistance R2 are connect with resistance R1 and resistance R3 respectively, electricity
The both ends of resistance R3 are connect with resistance R2 and resistance R4 respectively, and the type of attachment of specific composition favour stone full-bridge equiarm circuit 12 is
Known to those skilled in the art, details are not described herein again.
When specifically working, when measuring circuit is by certain pressure, favour stone full-bridge equiarm circuit 12 is defeated by first
Lead 3 and the second output lead 4 export full-bridge equiarm output voltage U outo, specifically:
Favour stone full-bridge equiarm circuit 12 obtains bridge arm output voltage by the first output lead 3 and the second input lead 5
Uo1, specifically:
In above-mentioned formula, UiThe electricity on the first input lead 1 and the second input lead 3 is loaded on for power module 11
Pressure, Δ R is the variable quantity of each resistance when favour stone full-bridge equiarm circuit 12 is under pressure, and R is resistance R1, resistance R2, electricity
Hinder the resistance value of R3 and resistance R4.
Since the part of the force of favour stone full-bridge equiarm circuit 12 is elastomer, the structure of elastomer will not mutate,
So full-bridge equiarm output voltage U can be calculatedoWith bridge arm output voltage Uo1First differential
Convolution (3) and formula (4), it can be deduced that
To sum up, when weighing sensor is all gone well, full-bridge equiarm output voltage UoFirst differential be bridge arm output electricity
Press Uo12 times of first differential, and when weighing sensor breaks down, this relationship be not applicable in, around this principle to weighing
Sensor carries out fault detection.
Therefore, when using full-bridge equiarm output voltage UoFirst differential and bridge arm output voltage Uo1First differential ratio
When value, the breakdown judge threshold value weighed in processor 8 is the range centered on numerical value 2, when to full-bridge equiarm output voltage Uo
First differential and bridge arm output voltage Uo1The other modes of first differential when being compared, can correspond to and determine breakdown judge threshold
The range of value.
When it is implemented, third output lead 5 can also be arranged, third output lead 5 is connect with the second input lead 2,
At this point, bridge arm output voltage U can be obtained with third output lead 5 by the second output lead 4o2, it can utilize full-bridge equiarm
Output voltage UoFirst differential and bridge arm output voltage Uo2First differential carry out above-mentioned judgement；It is, of course, also possible to utilize
First output lead 3 and the first input lead 1, or it is defeated to corresponding bridge arm with the first input lead 1 using the second output lead 4
Voltage out, and then above-mentioned calculating deterministic process is repeated, it specifically can according to need and selected, details are not described herein again.
Further, storage unit 9 is connected on the weighing processor 8 and the data for data transmission transmit mould
Block 10.
In the embodiment of the present invention, storage unit 9 can be using common storage form, such as RAM, the data transmission module
10 include RS485 interface circuit, and data transmission circuit 10 can also be using forms such as RS232, bluetooths.Weighing processor 8 can be with
By full-bridge equiarm output voltage UoAnd relevant fault message is stored, so as to subsequent retrospect.
The present invention weighs processor 8 to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1It is micro- to carry out single order
Point, and utilize full-bridge equiarm output voltage UoFirst differential, bridge arm output voltage Uo1First differential size relation carry out
Fault detection judgement, is not only able to achieve required weight measurement, moreover it is possible to which whether real-time detection weighing sensor breaks down, safety
Reliably.
Claims (6)
1. a kind of resistance-strain type digital weighing sensor with fault detection, including the measurement electricity for incuding dependent variable
Road, the measuring circuit use favour stone full-bridge equiarm circuit (12), and the is arranged on the favour stone full-bridge equiarm circuit (12)
One input lead (1), the second input lead (2), the first output lead (3) and the second output lead (4) pass through the first output
Lead (3), the second output lead (4) can obtain full-bridge equiarm output voltage Uo；It is characterized in that: further including for signal processing
It weighs processor (8), the weighing processor (8) passes through the first output lead (3), and with the second input lead (2) to obtain bridge arm defeated
Voltage U outo1；
Processor (8) are weighed to full-bridge equiarm output voltage UoAnd bridge arm output voltage Uo1First differential is carried out, and is utilized
Full-bridge equiarm output voltage UoFirst differential and bridge arm output voltage Uo1First differential size relation carry out fault detection
Judgement.
2. the resistance-strain type digital weighing sensor according to claim 1 with fault detection, characterized in that weighing
When processor (8) carries out breakdown judge, deterministic process includes determining full-bridge equiarm output voltage UoFirst differential and bridge arm export
Voltage Uo1The ratio of first differential, if the ratio is matched with the breakdown judge threshold value in weighing processor (8), at weighing
Reason device (8) judges measuring circuit fault-free, otherwise, it is determined that there are failures for measuring circuit.
3. the resistance-strain type digital weighing sensor according to claim 1 with fault detection, characterized in that described
Favour stone full-bridge equiarm circuit (12) is connect by filter network (6) and adc circuit (7) with weighing processor (8), favour stone
The first output lead (3), the second output lead (4) and the second input lead (2) on full-bridge equiarm circuit (12) with filter
Wave network (6) connection, the first input lead (1), the second input lead (2) on favour stone full-bridge equiarm circuit (12) also with electricity
Source module (11) connection, power module (11) also connect with the power end of adc circuit (7) and the power end of weighing processor (8)
It connects.
4. the resistance-strain type digital weighing sensor according to claim 3 with fault detection, characterized in that described
Favour stone full-bridge equiarm circuit (12) includes the identical resistance R1 of resistance value, resistance R2, resistance R3 and resistance R4, resistance R1, electricity
Resistance R2, resistance R3 and resistance R4 are successively connected with each other, one end of the first input lead (1) and one end of resistance R1 and resistance
The connection of the one end R4, one end of the second input lead (2) are connect with one end of one end of resistance R2 and resistance R3, and the first output is drawn
One end of line (3) is connect with the other end of the other end of resistance R1 and resistance R2, one end of the second output lead (4) and resistance
The other end connection of the other end and resistance R4 of R3；
Filter network (6) includes capacitor C1, capacitor C2, capacitor C3 and capacitor C4；The one of one end of capacitor C1 and capacitor C2
End is connect with the other end of the first output lead (3), the other end of the second output lead (4) and one end of capacitor C3 and electricity
Hold the other end connection of C4；The other end of capacitor C1, the other end of capacitor C2, the other end of capacitor C3 and capacitor C4 it is another
End is connect after being connected with each other with the second input lead (2).
5. the resistance-strain type digital weighing sensor according to claim 1 with fault detection, characterized in that described
Storage unit (9) and the data transmission module (10) for data transmission are connected in weighing processor (8).
6. the resistance-strain type digital weighing sensor according to claim 5 with fault detection, characterized in that described
Data transmission module (10) includes RS485 interface circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710235287.XA CN107063410B (en) | 2017-04-12 | 2017-04-12 | Resistance-strain type digital weighing sensor with fault detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710235287.XA CN107063410B (en) | 2017-04-12 | 2017-04-12 | Resistance-strain type digital weighing sensor with fault detection |
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| Publication Number | Publication Date |
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| CN107063410A CN107063410A (en) | 2017-08-18 |
| CN107063410B true CN107063410B (en) | 2019-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710235287.XA Active CN107063410B (en) | 2017-04-12 | 2017-04-12 | Resistance-strain type digital weighing sensor with fault detection |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107966193A (en) * | 2017-11-02 | 2018-04-27 | 广东乐心医疗电子股份有限公司 | It is a kind of can subregion measurement electronic scale |
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| CN104950201A (en) * | 2015-06-12 | 2015-09-30 | 东南大学 | Fault diagnosis method of modular multilevel inverter based on state observation |
| CN105571691A (en) * | 2014-10-09 | 2016-05-11 | 梅特勒-托利多(常州)精密仪器有限公司 | Weighing sensor, weighing network, and monitoring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4244394A1 (en) * | 1992-12-29 | 1994-07-07 | Pietzsch Automatisierungstech | Interface for verifiable electromechanical scales |
| CN201177531Y (en) * | 2008-04-08 | 2009-01-07 | 上海梅山钢铁股份有限公司 | Electric resistance strain type weighing sensor simulator |
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