CN107063410B - Resistance-strain type digital weighing sensor with fault detection - Google Patents

Resistance-strain type digital weighing sensor with fault detection Download PDF

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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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CN107063410A (en
Inventor
王卫东
刘洋
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Wuxi Yance Technology Co Ltd
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Wuxi Yance Technology Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G3/00Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
    • G01G3/12Weighing 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
    • G01G3/13Weighing 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01GWEIGHING
    • G01G23/00Auxiliary devices for weighing apparatus
    • G01G23/01Testing 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

Resistance-strain type digital weighing sensor with fault detection
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.
CN201710235287.XA 2017-04-12 2017-04-12 Resistance-strain type digital weighing sensor with fault detection Active CN107063410B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
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* Cited by examiner, † Cited by third party
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
CN203164326U (en) * 2013-03-11 2013-08-28 唐山钢铁集团微尔自动化有限公司 Digital display type detection device of resistor strain sensor
CN103344450A (en) * 2013-07-16 2013-10-09 中科华核电技术研究院有限公司 Load simulator
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