CN106054088B - It is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit - Google Patents
It is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit Download PDFInfo
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- CN106054088B CN106054088B CN201610555560.2A CN201610555560A CN106054088B CN 106054088 B CN106054088 B CN 106054088B CN 201610555560 A CN201610555560 A CN 201610555560A CN 106054088 B CN106054088 B CN 106054088B
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- magnetic flux
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- 230000004907 flux Effects 0.000 title claims abstract description 30
- 230000001629 suppression Effects 0.000 claims abstract description 14
- 230000001939 inductive effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 11
- 230000003321 amplification Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000013480 data collection Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007716 flux method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/12—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress
- G01L1/127—Measuring force or stress, in general by measuring variations in the magnetic properties of materials resulting from the application of stress by using inductive means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Measuring Magnetic Variables (AREA)
- Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
Abstract
The invention discloses it is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit, including magnetic flux transducer, integrating circuit, analog switch, subtraction circuit, amplifier, low-pass filter, analog-digital converter, microcontroller, digital analog converter；It is characterized in that：The inductive signal of magnetic flux transducer output exports integral voltage by integrating circuit, and subtraction circuit is reached by analog switch and obtains the sensor signal of zero suppression, then digital quantity is converted by analog-digital converter by amplifier and low-pass filter and is read by microcontroller.The present invention is zeroed by the zero point base value for measuring magnetic flux transducer from circuit, and Dynamic Signal is amplified by amplifying circuit, to directly enhance the sensitivity of sensor, the anti-interference ability of system is improved, so that the measuring precision greatly promotes.
Description
Technical field
The present invention relates to field of civil engineering is belonged to, it is applied to the safe and healthy monitoring industry of structure, and in particular to Yi Zhongti
High magnetic flux sensor dynamic output range from zero amplifying circuit.
Background technique
Currently, the detection of domestic bridge cable force is usually to use following several methods：Oil pressure gauge method, pressure sensor are surveyed
Fixed, vibratory drilling method (frequency method) etc..But since oil pressure gauge method is there are the easy deviation of pointer, pointer shake is big when high pressure, and reading is artificial
The disadvantages of error is big；The problems such as determination of pressure sensor method dynamic response is poor, and the service life is short, expensive；Vibratory drilling method (frequency method)
Reliability depend on the installation site of vibration pickup, the problems such as can not achieve round-the-clock detection；But it is directed to bridge cable in recent years
Power detection occurs using magnetic flux method as the new method of representative, and future in engineering applications with higher.Bridge cable force magnetic flux
The principle of quantity measuring method is the magnetoelastic effect based on ferrimagnet, i.e., when the external mechanical load that ferrimagnet is born
When changing, the internal intensity of magnetization (magnetic conductivity) changes.In engineering practice, by testing ferrimagnet system
At the magnetic conductivity variation of component can be used to measure the internal stress of component.However current magnetic flux data collection system
In, sensor output full scale inductive signal generally tens arrive several hundred millivolts, extraneous electromagnetic interference, equipment background make an uproar
Sound can all have an impact the output signal of sensor, to reduce the measurement accuracy of system.Again because magnetic flux transducer exists
When zero stress of cable, the induced voltage under current state can be exported, the induced voltage of other ranges be relative to cable zero by
Opposite variation when power, induced voltage using the available corresponding real physical of integrating circuit integral voltage, at this time
Integral voltage (zero point base value) has accounted for the most dynamic range of analog-digital converter, so if not eliminating cable zero
Nought state inductive voltage value when stress, then the dynamic range waste or the amplification of rear class signal of either analog-digital converter
All it is limited.
Summary of the invention
In place of the present invention is in order to solve the deficiencies in the prior art, spy releases a kind of new amplifying circuit, and specific scheme is：
It is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit, including magnetic flux transducer, integrating circuit, simulation
Switch, subtraction circuit, amplifier, low-pass filter, analog-digital converter, microcontroller, digital analog converter；It is characterized in that：Institute
The inductive signal for stating magnetic flux transducer output exports integral voltage by integrating circuit, and reaches subtraction electricity by analog switch
Rood is to the sensor signal of zero suppression, then by amplifier and low-pass filter by analog-digital converter to be converted into digital quantity micro-
Controller is read.
Preferably, the zero point base value of integrating circuit output is directly inputted to modulus by microcontroller control analog switch and turns
It changes.
Preferably, zero point base value is input to subtraction circuit by digital analog converter by microcontroller.
Preferably, integral voltage improves signal-to-noise ratio using amplifier after subtraction circuit subtracts zero point base value.
Preferably, microcontroller control analog switch carrys out selection signal link.
Working principle, first magnetic flux transducer inner cable pass through integral electricity in the induced voltage signal that zero stress exports
Road is converted into the variable quantity of cable magnetic flux, because integrating circuit has a time constant, after integrating circuit, and output
Signal or voltage value, which is denoted as U0.Because system needs to obtain zero point base value voltage U for the first time0, therefore next stage passes through
One is controlled by the analog switch of microcontroller, signal is directly improved into analog-digital converter, and the value is recorded in micro-control
In device processed.When system enters measuring phases, for example cable has received external force.And the signal generated obtains after integrating circuit
To for U1, signal chains are switched to subtracter all the way by analog switch by microcontroller at this time, while microcontroller passes through digital-to-analogue
The U that converter will be kept0It is configured to the input terminal of subtracter, preparation and U1Carry out subtraction.Work as U in this way1Reach subtracter
Afterwards, with U0Subtract each other, obtains an opposite and U0Variation delta U, the variable quantity be exactly the cable that measures of magnetic flux transducer from
When 0 stress is to by some force value, the change in electric amount reflected, the signal, can be by next because amplitude is small
Grade amplification the sensitivity enhancement of sensor, then low-pass filtered device are filtered out interference signal after by analog-digital converter, thus
So that the out-put dynamic range of sensor increases, the measurement accuracy of system is improved.
This circuit using amplifying circuit can amplified signal improve and to the principle that equipment background noise does not amplify equally
The signal-to-noise ratio of system, to improve the measurement accuracy of system.Such as in circuit not zero suppression, signal is already close to analog-digital converter
Half of range, at this time if by signal amplifier, signal will clipping distortion, if do not amplified, for example signal voltage value is
2.5V, the interference of equipment background noise bring are ± 1mV, and system full scale variable quantity is 100mV, then since equipment background is made an uproar
Sound bring error is up to ± 1%；And by from after zero suppression amplifying circuit, such as by the zero point base value zero setting of 2.5V, at this time
When signal can be amplified 5~10 times by amplifying circuit, for example amplify 5 times, equipment background noise is basically unchanged at this time, and signal is full
Range variable quantity is 500mV, then the error of system will be reduced to ± 0.2%.
The present invention is zeroed by the zero point base value for measuring magnetic flux transducer from circuit, and passes through amplifying circuit pair
Dynamic Signal amplification, to directly enhance the sensitivity of sensor, improves the anti-interference ability of system, so that system is surveyed
Accuracy of measurement greatly promotes.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the principle of the present invention block diagram.
Fig. 2 is of the invention from zero suppression analog module part.
Fig. 3 is filtering and amplifying circuit part of the present invention.
Description of symbols：
1, magnetic flux transducer；2, integrating circuit；3, analog switch；4, subtraction circuit；5, amplifier；6, low-pass filtering
Device；7, analog-digital converter；8, microcontroller；9, digital analog converter.
Specific embodiment
Functional block diagram as shown in Figure 1, it is a kind of improve magnetic flux transducer dynamic output range from zero suppression amplifying circuit,
It includes magnetic flux transducer 1, integrating circuit 2, analog switch 3, subtraction circuit 4, amplifier 5, low-pass filter 6, modulus turn
Parallel operation 7, microcontroller 8, digital analog converter 9；It is characterized in that：The inductive signal that magnetic flux transducer 1 exports passes through integral electricity
Road 2 exports integral voltage, and reaches subtraction circuit 4 by analog switch 3 and obtain the sensor signal of zero suppression, then pass through amplifier
5 and low-pass filter 6 be converted into digital quantity by analog-digital converter 7 and read by microcontroller 8；The zero point that integrating circuit 2 exports
Base value controls analog switch 3 by microcontroller 8 and is directly inputted to analog-to-digital conversion 7；Zero point base value is passed through digital-to-analogue by microcontroller 8
Converter 9 is input to subtraction circuit 4；Integral voltage, which improves after subtraction circuit 4 subtracts zero point base value using amplifier 5, to be believed
It makes an uproar ratio；Microcontroller 8 controls analog switch 3 and carrys out selection signal link.
Magnetic flux transducer inner cable is converted into the induced voltage signal that zero stress exports by integrating circuit first
The variable quantity of cable magnetic flux, because integrating circuit has a time constant, after integrating circuit, the signal of output is also
It is voltage value, which is denoted as U0.Because system needs to obtain zero point base value voltage U for the first time0, therefore next stage is controlled by one
In the analog switch of microcontroller, signal is directly improved into analog-digital converter, and in the microcontroller by value record.When
When system enters measuring phases, for example cable has received external force.And the signal generated is obtained after integrating circuit as U1, this
When microcontroller signal chains are switched to all the way by subtracter by analog switch, while microcontroller will be protected by digital analog converter
The U kept0It is configured to the input terminal of subtracter, preparation and U1Carry out subtraction.Work as U in this way1After reaching subtracter, with U0Phase
Subtract, obtains an opposite and U0Variation delta U, the variable quantity be exactly the cable that measures of magnetic flux transducer from 0 stress to
When by some force value, the change in electric amount reflected, for the signal because amplitude is small, can be amplified by next stage will
The sensitivity enhancement of sensor, then low-pass filtered device interference signal is filtered out after by analog-digital converter so that sensing
The out-put dynamic range of device increases, and improves the measurement accuracy of system.
In the present embodiment, the integrating amplification circuit of signal chain part, subtracter, amplifier, filter etc. use low noise
Sound pitch precision amplifier, integrating circuit uses OP297 in practice, and other parts use OPA2277.Digital analog converter part uses
Combination of the AD420 Jing Guo external amplifier, so that digital analog converter output can reach the output area of ± 10V.AD420 passes through number
Word interface is connected to microcontroller, configures its output voltage by microcontroller, and for subtracter, wherein one end is inputted.Zero point integral
After voltage and the voltage of digital analog converter AD420 configuration subtract each other, it is output to in-phase proportion amplifying circuit U71B, using low pass filtered
Wave device U66A enters analog-digital converter.When system obtains zero point base value for the first time, integrating circuit output passes through analog switch
The direct piece of ADG1219, which is selected to analog-digital converter, to be read out.
Effect of the invention is：This circuit using amplifying circuit can amplified signal, and it is not same to equipment background noise
The principle of amplification, improves the signal-to-noise ratio of system, to improve the measurement accuracy of system.Such as in circuit not zero suppression, signal is
Through half of range close to analog-digital converter, at this time if by signal amplifier, signal will clipping distortion, if do not amplified,
For example signal voltage value is 2.5V, the interference of equipment background noise bring is ± 1mV, and system full scale variable quantity is 100mV, that
Since equipment background noise bring error is up to ± 1%；And by from after zero suppression amplifying circuit, such as by the zero of 2.5V
Signal can be amplified 5~10 times by amplifying circuit at this time by point base value zero setting, such as at 5 times of amplification, equipment background noise at this time
It is basically unchanged, signal full scale variable quantity is 500mV, then the error of system will be reduced to ± 0.2%.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The change or replacement expected without creative work, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection scope should be determined by the scope of protection defined in the claims.
Claims (4)
1. it is a kind of improve magnetic flux transducer dynamic output range from zero suppression amplifying circuit, it include magnetic flux transducer (1),
It is integrating circuit (2), analog switch (3), subtraction circuit (4), amplifier (5), low-pass filter (6), analog-digital converter (7), micro-
Controller (8), digital analog converter (9)；It is characterized in that：The inductive signal of magnetic flux transducer (1) output passes through integral
Circuit (2) exports integral voltage, and reaches subtraction circuit (4) by analog switch (3) and obtain the sensor signal of zero suppression, then lead to
It crosses amplifier (5) and low-pass filter (6) and is converted into digital quantity by analog-digital converter (7) and read by microcontroller (8), it is described
The zero point base value of integrating circuit (2) output is directly inputted to analog-to-digital conversion by the microcontroller (8) control analog switch (3)
Device (7).
2. it is according to claim 1 it is a kind of improve magnetic flux transducer dynamic output range from zero suppression amplifying circuit,
It is characterized in that：Zero point base value is input to the subtraction circuit (4) by digital analog converter (9) by the microcontroller (8).
3. it is according to claim 1 it is a kind of improve magnetic flux transducer dynamic output range from zero suppression amplifying circuit,
It is characterized in that：The integral voltage improves signal-to-noise ratio using amplifier (5) after subtraction circuit (4) subtracts zero point base value.
4. it is according to claim 2 it is a kind of improve magnetic flux transducer dynamic output range from zero suppression amplifying circuit,
It is characterized in that：Microcontroller (8) control analog switch (3) carrys out selection signal link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610555560.2A CN106054088B (en) | 2016-07-14 | 2016-07-14 | It is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit |
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| CN201610555560.2A CN106054088B (en) | 2016-07-14 | 2016-07-14 | It is a kind of improve magnetic flux transducer dynamic output range from zero amplifying circuit |
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| CN106054088A CN106054088A (en) | 2016-10-26 |
| CN106054088B true CN106054088B (en) | 2018-11-30 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102017200143A1 (en) * | 2017-01-09 | 2018-07-12 | Robert Bosch Gmbh | magnetometer |
| CN112748337B (en) * | 2019-10-31 | 2023-08-04 | 北京小米移动软件有限公司 | Electronic device, method and device for controlling motor in electronic device |
| CN113933762B (en) * | 2021-09-22 | 2023-07-25 | 珠海凌达压缩机有限公司 | Method and system for measuring magnetic flux of rotor of variable frequency compressor |
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|---|---|---|---|---|
| DE2249390A1 (en) * | 1972-10-09 | 1974-05-02 | Inst Elektrodinamiki Akademii | DIGITAL EMF KNIFE FOR HALL GENERATOR |
| SU1749858A1 (en) * | 1990-02-26 | 1992-07-23 | Производственное объединение "Ижевский мотозавод" | Device for checking magnetic properties of articles |
| CN1845457A (en) * | 2006-04-26 | 2006-10-11 | 中国科学院等离子体物理研究所 | Auto-compensative low drift integrator and its controlling method |
| CN101210905A (en) * | 2007-12-21 | 2008-07-02 | 浙江大学 | Giant magnetoresistance eddy current probe with self-zero adjustment function |
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2016
- 2016-07-14 CN CN201610555560.2A patent/CN106054088B/en active Active
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|---|---|---|---|---|
| DE2249390A1 (en) * | 1972-10-09 | 1974-05-02 | Inst Elektrodinamiki Akademii | DIGITAL EMF KNIFE FOR HALL GENERATOR |
| SU1749858A1 (en) * | 1990-02-26 | 1992-07-23 | Производственное объединение "Ижевский мотозавод" | Device for checking magnetic properties of articles |
| CN1845457A (en) * | 2006-04-26 | 2006-10-11 | 中国科学院等离子体物理研究所 | Auto-compensative low drift integrator and its controlling method |
| CN101210905A (en) * | 2007-12-21 | 2008-07-02 | 浙江大学 | Giant magnetoresistance eddy current probe with self-zero adjustment function |
| CN104597276A (en) * | 2013-10-30 | 2015-05-06 | 恩智浦有限公司 | Device for removing OFFSET from signal, method thereof, and magnetic sensor unit |
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Denomination of invention: A Self-zero Amplification Circuit for Improving the Dynamic Output Range of Magnetic Flux Sensor Effective date of registration: 20230104 Granted publication date: 20181130 Pledgee: Bank of Communications Ltd. Jiangxi branch Pledgor: JIANGXI FASHION TECHNOLOGY Co.,Ltd. Registration number: Y2023980030160 |
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Granted publication date: 20181130 Pledgee: Bank of Communications Ltd. Jiangxi branch Pledgor: JIANGXI FASHION TECHNOLOGY Co.,Ltd. Registration number: Y2023980030160 |
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