CN108469594A - A kind of high-precision, closed loop gradient magnetoresistive sensor - Google Patents
A kind of high-precision, closed loop gradient magnetoresistive sensor Download PDFInfo
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- CN108469594A CN108469594A CN201810206306.0A CN201810206306A CN108469594A CN 108469594 A CN108469594 A CN 108469594A CN 201810206306 A CN201810206306 A CN 201810206306A CN 108469594 A CN108469594 A CN 108469594A
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- 230000035945 sensitivity Effects 0.000 claims abstract description 4
- 239000000696 magnetic material Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 2
- 230000005389 magnetism Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005355 Hall effect Effects 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000002964 excitative effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
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- 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
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/063—Magneto-impedance sensors; Nanocristallin sensors
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Abstract
The present invention relates to a kind of high-precision, closed loop gradient magnetoresistive sensors.The present invention includes eight mistors, and each two mistor is a pair, and the distance for being tested magnetic source per two mistor distances of centering is identical, and four pairs of mistors and tested magnetic source distance are different.Distance, which is tested two pairs of close mistors of magnetic source distance, can detect that tested magnetic source magnetic field, distance are tested two pairs of remote mistors of magnetic source distance not by tested magnetic source magnetic interference.Two pairs of resistance that can detect tested magnetic source magnetic field are not linked to be one group of wheatstone bridge circuits with a pair by tested magnetic source magnetic interference respectively；Two groups of wheatstone bridge circuits connect two groups of feedback circuits respectively.The present invention uses two groups of wheatstone bridge circuits and two groups of independent feedback circuits of difference, can not only measure magnetic field gradient, can also measure magnetic field intensity.And high sensitivity, good linearity, temperature range are wide, the interference of anti-external magnetic field, high certainty of measurement.
Description
Technical field
The invention belongs to sensor technical field, it is related to a kind of high-precision, closed loop gradient magnetoresistive sensor.
Background technology
Magnetic Sensor is widely used in contemporary electronic systems and for measuring the physical parameters such as electric current, position, direction.Mesh
Preceding measurement magnetic field intensity master device to be used has following several：Hall effect sensor, induction coil magnetometer and magnetic flux
Door；Hall effect sensor is the sensor designed according to the Hall effect of semiconductor, is vulnerable to the dry of external magnetic field
It disturbs and temperature drift is larger；Induction coil magnetometer be worked according to Faraday's electromagnetic induction law, but its cannot detect it is static or
Slowly varying magnetic field, low frequency response is poor, and major applications are in neighbouring and distance measurement；The basic principle of fluxgate is to utilize height
Magnetic conductivity, low-coercivity soft magnetic materials magnetic core under excitatory effect, it is humorous that the even that becomes with environmental magnetic field occurs in induction coil
The potential behavior of wave component measures even-order harmonic component, to measure environmental magnetic field by high performance fluxgate modulate circuit
Size, but electromagnetism entire body product is larger, and price is high and frequency response is relatively low.
At present measure magnetic field gradient one wheatstone bridge circuits of sensor technology generally use (such as application No. is
201210065925.5 patent of invention), mistor is placed on to the both sides of conducting wire, by the magnetic field ladder for experiencing conducting wire both sides
Degree, to realize measuring signal magnetic field purpose.But it since the technology uses single bridges circuit, does not account for sensor
The precision of the magnetic hysteresis of itself and nonlinear feedback compensation, measurement is limited.
Invention content
It is an object of the invention to provide a kind of high-precision, closed loop gradient magnetoresistive sensors.
The present invention includes eight mistors, and each two mistor is a pair, per two mistors of centering apart from quilt
The distance for surveying magnetic source is identical, and four pairs of mistors and tested magnetic source distance are different.Distance is tested two pairs of close magnetic of magnetic source distance
Quick resistance can detect tested magnetic source magnetic field, and it is not dry by tested magnetic source magnetic field that distance is tested two pairs of remote mistors of magnetic source distance
It disturbs.
A pair can detect that the resistance in tested magnetic source magnetic field is not connected respectively with a pair of by the resistance of tested magnetic source magnetic interference
At one group of wheatstone bridge circuits, remaining two pairs of mistor is linked to be one group of wheatstone bridge circuits；Two groups of Wheatstone bridge electricity
Road is full-bridge type wheatstone bridge circuits, and two groups of wheatstone bridge circuits connect two groups of feedback circuits respectively.
Described is not covered or is placed in tested magnetic by two pairs of mistors of tested magnetic source magnetic interference by soft magnetic materials
Outside the magnetic field of source.
The mistor is giant magnetoresistance resistance or magnetic tunnel-junction resistance.
The soft magnetic materials is dilval.
Two groups of feedback circuits are made of feedback resistance and feedback coil respectively, and feedback coil is arranged in same electric bridge
Around the mistor that can detect tested magnetic source magnetic field in circuit, the feedback magnetic for being parallel to mistor sensitivity axis direction is generated
, the direction of feedback magnetic field is opposite with the former direction in magnetic field.
The present invention uses two groups of wheatstone bridge circuits and two groups of independent feedback circuits of difference, two groups of Wheatstone bridge electricity
Road is placed according to the far and near gradient apart from magnetic source, gradiometry is carried out to signal magnetic field, to obtain the intensity of magnetic field signal；Two
Group two groups of electric bridges of feedback circuit pair carry out independent feedback respectively, to keep measurement more accurate.Magnetic field gradient can be not only measured,
Magnetic field intensity can also be measured.And high sensitivity, good linearity, temperature range are wide, the interference of anti-external magnetic field, high certainty of measurement.
Description of the drawings
Fig. 1 is the overall structure line map of the embodiment of the present invention one；
Fig. 2 is the structure line map of the embodiment of the present invention two；
Fig. 3 is a kind of line map of feedback circuit of Fig. 1；
Fig. 4 is the relative position schematic diagram of feedback coil and mistor；
Fig. 5 is one fundamental diagram of embodiment；
Fig. 6 is the line map of another feedback circuit of Fig. 1.
Specific implementation mode
As shown in Figure 1, a kind of high-precision, closed loop gradient magnetoresistive sensor in embodiment one, including eight mistors
R1~R8, each two mistor are a pair, and the distance for being tested magnetic source per two mistor distances of centering is identical, four pairs of magnetosensitives
Resistance and tested magnetic source distance are different.Distance, which is tested two pairs of close mistors of magnetic source distance, can detect tested magnetic source magnetic
；Distance is tested two pairs of remote mistors of magnetic source distance and is placed in outside tested magnetic source magnetic field, to not by tested magnetic source magnetic field
Interference.
Two pairs of resistance that can detect tested magnetic source magnetic field are not respectively with a pair of by the magnetosensitive of tested magnetic source magnetic interference electricity
Resistance is linked to be one group of wheatstone bridge circuits.Two groups of wheatstone bridge circuits are full-bridge type wheatstone bridge circuits, two groups of favour stones
Electric bridge full-bridge circuit generates two difference outputs Vout1 and Vout2.Two groups of wheatstone bridge circuits connect two groups of feedback electricity respectively
Road.The mistors of source signals can be experienced in two groups of Wheatstone bridges to place apart from magnetic source distance gradient, thus two groups of favours this
The output of energization bridge signal is different, and gradient magnetic size can be obtained by comparison.
As shown in Fig. 2, two pairs of remote mistors of the tested magnetic source distance of distance are covered by soft magnetic materials in embodiment two, from
Without by tested magnetic source magnetic interference.
Distance is tested the mistor that two pairs of close mistors of magnetic source distance are covered with a pair by soft magnetic materials respectively and connects
At one group of Wheatstone bridge full-bridge circuit, two groups of Wheatstone bridge full-bridge circuits generate two difference outputs.In same group of electric bridge,
Two mistors are placed in parallel, it is ensured that the magnetic field intensity for the magnetic source experienced is identical, two magnetosensitives covered by ferronickel material
Resistance is placed in parallel, convenient for constituting bridge circuit, be used for experiencing in two groups of bridge circuits the mistor of magnetic field intensity according to away from
Far and near gradient from magnetic source is placed, it is ensured that carries out gradiometry to magnetic field.
When two groups of Wheatstone bridges of embodiment one and embodiment two are fed back respectively, feedback circuit structure is similar.With
For embodiment one, as shown in figure 3, for the structural schematic diagram independently fed back to two groups of wheatstone bridge circuits.Often
The output signal that group Wheatstone bridge obtains is respectively by first order feed-back amplifying circuit, and the output of each amplifier is by feeding back electricity
The feedback coil on road forms one kind and independently feeds back, and the electric current in two feedback coils can detect tested magnetic source magnetic field
Two pairs of mistors at generate feedback magnetic field, the magnetic field that the feedback magnetic field provided and magnetic source generate at this is equal in magnitude,
Direction on the contrary, offset therewith；The output of two first stage amplifiers is amplified by two level, using comparator, is obtained final
Export Vout3.The former magnetic field signal detected at two pairs of mistors due to that can detect tested magnetic source magnetic field is of different sizes
Two feedback coils provide feedback current it is of different sizes.
Feedback electricity is connected separately in the first order feed-back amplifying circuit of two groups of Wheatstone bridges between amplifier and feedback coil
Hinder R9, R10.
As shown in figure 4, for the relative position schematic diagram of feedback coil and mistor, this sentences coil on mistor
For side, feedback coil may be alternatively located at mistor lower section or both sides in actual use, can generate and be parallel at mistor
The magnetic field of sensitive axis direction.
As shown in figure 5, under working condition, the magnetic field 2 that magnetic source 1 generates, the magnetic that the mistor closer from magnetic source is experienced
Field intensity 3, is denoted as H1；From the magnetic field intensity 4 that the mistor of magnetic field intensity farther out is experienced, it is denoted as H2.By magnetic field intensity
Gradient is able to know that magnetic field intensity is stronger at the position closer from magnetic source, therefore can learn H1>H2, therefore when using phase
With the number of turns feedback coil when, be added in magnetic of the electric current than separate magnetic source of the feedback coil on the mistor closer from magnetic source
It is quick ohmically big.
As shown in fig. 6, to be applied with another feedback circuit structure schematic diagram, two groups of favour stones to the structure of embodiment 2
For the output signal that bridge circuit obtains respectively by first order feed-back amplifying circuit, the output of each amplifier feeds back to feedback completely
On coil, R9, R10 are two feedback resistances, and the output that feedback coil obtains amplifies to obtain output Vout by amplifier.
Two wheatstone bridge circuits of the present invention and two feedback circuits independently measure essence to improve
Degree, the position sequencing that resistance is placed in double bridge circuit, and and the mistor covered by soft magnetic materials and measurement
Line between resistance has strict requirements.It is anti-in feedback circuit.Feedback straight wire in feedback circuit is placed on corresponding
Bridge circuit resistance on, the selection of the feedback magnetic of formation feed resistance will not lead to amplifier overload, and will not bring dry
It disturbs opposite with the direction in the direction magnetic fields Ying Heyuan of the resistive field of noise.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Profit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent requirements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
Claims (5)
1. a kind of high-precision, closed loop gradient magnetoresistive sensor, including eight mistors；It is characterized in that：Described every two
A mistor is a pair, and the distance that magnetic sources are tested per centering two mistors distance is identical, four pairs of mistors with it is tested
Magnetic source distance is different；Distance, which is tested two pairs of close mistors of magnetic source distance, can detect that tested magnetic source magnetic field, distance are tested
Two pairs of remote mistors of magnetic source distance are not by tested magnetic source magnetic interference；
A pair can detect that the resistance in tested magnetic source magnetic field is not linked to be one with a pair by the resistance of tested magnetic source magnetic interference respectively
Group wheatstone bridge circuits, remaining two pairs of mistor are linked to be one group of wheatstone bridge circuits；Two groups of wheatstone bridge circuits are
Full-bridge type wheatstone bridge circuits, two groups of wheatstone bridge circuits connect two groups of feedback circuits respectively.
2. a kind of high-precision as described in claim 1, closed loop gradient magnetoresistive sensor, it is characterised in that：It is described not by
Two pairs of mistors of tested magnetic source magnetic interference are covered or be placed in outside tested magnetic source magnetic field by soft magnetic materials.
3. a kind of high-precision as described in claim 1, closed loop gradient magnetoresistive sensor, it is characterised in that：The magnetosensitive
Resistance is giant magnetoresistance resistance or magnetic tunnel-junction resistance.
4. a kind of high-precision as described in claim 1, closed loop gradient magnetoresistive sensor, it is characterised in that：The soft magnetism
Material is dilval.
5. a kind of high-precision as described in claim 1, closed loop gradient magnetoresistive sensor, it is characterised in that：Described two groups
Feedback circuit is made of feedback resistance and feedback coil respectively, and feedback coil setting can detect tested in same bridge circuit
Around the mistor in magnetic source magnetic field, the feedback magnetic field for being parallel to mistor sensitivity axis direction, the direction of feedback magnetic field are generated
It is opposite with the direction in former magnetic field.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810206306.0A CN108469594B (en) | 2018-03-13 | 2018-03-13 | High-precision closed-loop gradient magnetic resistance sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810206306.0A CN108469594B (en) | 2018-03-13 | 2018-03-13 | High-precision closed-loop gradient magnetic resistance sensor |
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| CN108469594A true CN108469594A (en) | 2018-08-31 |
| CN108469594B CN108469594B (en) | 2023-07-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687485A (en) * | 2019-07-10 | 2020-01-14 | 杭州电子科技大学 | Wide-range vertical sensitive magnetic sensor with feedback on closed-loop core |
| CN113917216A (en) * | 2021-10-08 | 2022-01-11 | 江苏多维科技有限公司 | Current measuring device |
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| CN1300933A (en) * | 2001-02-08 | 2001-06-27 | 北京科大天宇微电子材料技术开发有限公司 | Slope angle sensor using magnetosensitive resistor |
| CN1695037A (en) * | 2002-11-08 | 2005-11-09 | 北京航天峰光电子技术有限责任公司 | Megnetic displacement measurement device |
| CN103090781A (en) * | 2013-01-11 | 2013-05-08 | 合肥高创传感器有限公司 | Magnetic-sensing sensor applied to lifting jack |
| CN103901365A (en) * | 2013-12-20 | 2014-07-02 | 叶友忠 | Modified Wheatstone half-bridge circuit and sensor |
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| CN1695037A (en) * | 2002-11-08 | 2005-11-09 | 北京航天峰光电子技术有限责任公司 | Megnetic displacement measurement device |
| CN103090781A (en) * | 2013-01-11 | 2013-05-08 | 合肥高创传感器有限公司 | Magnetic-sensing sensor applied to lifting jack |
| CN103901365A (en) * | 2013-12-20 | 2014-07-02 | 叶友忠 | Modified Wheatstone half-bridge circuit and sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687485A (en) * | 2019-07-10 | 2020-01-14 | 杭州电子科技大学 | Wide-range vertical sensitive magnetic sensor with feedback on closed-loop core |
| CN113917216A (en) * | 2021-10-08 | 2022-01-11 | 江苏多维科技有限公司 | Current measuring device |
| WO2023056827A1 (en) * | 2021-10-08 | 2023-04-13 | 江苏多维科技有限公司 | Current measurement device |
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| CN108469594B (en) | 2023-07-07 |
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