CN106556730A - Current sensor and the measurement apparatus comprising the current sensor - Google Patents
Current sensor and the measurement apparatus comprising the current sensor Download PDFInfo
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- CN106556730A CN106556730A CN201510624134.5A CN201510624134A CN106556730A CN 106556730 A CN106556730 A CN 106556730A CN 201510624134 A CN201510624134 A CN 201510624134A CN 106556730 A CN106556730 A CN 106556730A
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Abstract
The present invention provides a kind of current sensor and measurement apparatus.Current sensor includes being arranged on magnetic induction unit and the processing unit on the outside of tested wire, and the magnetic field that the magnetic induction unit is produced for the electric current that sensing flows through the tested wire simultaneously obtains induced signal corresponding with magnetic field size；The input of the processing unit electrically connects the outfan of the magnetic induction unit, which is used to process the induced signal, at least one pair of magnetic induction unit on the outside of the tested wire, the processing unit draw the current value for flowing through the tested wire according to the paired induced signal and by calculus of differences.The current sensor measurement high precision, strong antijamming capability, and also it is low using installation requirement.
Description
Technical field
The present invention relates to e measurement technology, specifically related to a kind of sensor and the measurement apparatus comprising the sensor.
Background technology
In the electrical equipment in the fields such as intelligent grid, wind-power electricity generation, metallurgy, chemical industry, often need to pass using electric current
Sensor carries out continual measurement to the electric current in work.And, with updating for corresponding technology in recent years,
Current sensor is also required to be continually improved and perfect at aspects such as technology, design and efficiency.
The current sensor for using at present has closed-loop current sensors and open-loop current sensor.Fig. 1 is closed for one kind
The structural representation of circular current sensor.As shown in figure 1, closed-loop current sensors include magnetic core 1, magnetic induction
Unit 2 and the bucking coil 3 being wrapped on the outside of magnetic core 1.Wherein, magnetic core 1 includes the first magnetic core 1a and second
Magnetic core 1b, is respectively provided with the opposite end of the first magnetic core 1a length directions (the longer sides place direction of magnetic core)
One convex portion, sets respectively in two opposite ends of the second magnetic core 1b length directions (the longer sides place direction of magnetic core)
Put a convex portion.Be oppositely arranged in the first magnetic core 1a and the second magnetic core 1b, and in the convex portion of the first magnetic core 1a and
The convex portion opposed area (in the shorter edge of magnetic core) of the second magnetic core 1b is provided with gap 4, and in the first magnetic core
1a and the second magnetic core 1b relative zone line is formed with a through hole 5, and tested wire 6 is set through the through hole 5
Put, magnetic induction unit 2 is arranged at 4 position of gap.The outfan electrical connection processing unit of magnetic induction unit 2,
The outfan electrical connection bucking coil 3 of processing unit.The sensing of magnetic induction unit 2 flows through the electric current of tested wire 6
The magnetic field of generation is simultaneously transmitted induced signal to processing unit, and processing unit analyzing and processing induced signal is compensated
Compensation electric current in coil 3.When the magnetic that the magnetic field that compensation electric current is produced is produced with the electric current for flowing through tested wire 6
When field reaches balance, you can acquisition flows through the current value of tested wire 6.
This closed-loop current sensors only arrange a magnetic induction unit 2, poor anti jamming capability, and, it is tested
Position of the wire 6 in through hole 5 has a significant impact to measurement result, and such as tested wire 6 presses close to magnetic induction unit
2 and there is relatively large deviation away from the current value measured by magnetic induction unit 2.Therefore, the current sensor is to quilt
The installation accuracy for surveying wire 6 has higher requirement.
Further, since magnetic induction unit 2 is arranged on the minor face of magnetic core 1, gap 4 is close to the corner of magnetic core 1,
Magnetic field homogeneity in gap 4 is poor, causes the certainty of measurement of current sensor low.
The content of the invention
The present invention provides a kind of measurement apparatus of open-loop current sensor comprising the current sensor, its anti-interference energy
Power is strong, and certainty of measurement is high, and installation requirement is low.
For this purpose, the present invention provides a kind of current sensor, including the magnetic induction unit being arranged on the outside of tested wire
And processing unit, the magnetic field that the magnetic induction unit is produced for the electric current that sensing flows through the tested wire is simultaneously obtained
Obtain induced signal corresponding with magnetic field size；The input of the processing unit electrically connects the magnetic induction unit
Outfan, which is used to process the induced signal, at least one pair of magnetic induction unit on the outside of the tested wire, described
Processing unit draws the electricity for flowing through the tested wire according to the paired induced signal and by calculus of differences
Flow valuve.
Wherein, magnetic induction unit described in each pair is symmetrically located at the outside of the tested wire.
Wherein, including magnetic core, magnetic core through hole is provided with the central area of the magnetic core, in the magnetic core through hole
Periphery is provided with opening air gap, and the tested wire is arranged through the magnetic core through hole, the quantity of the opening air gap
Equal with the quantity of the magnetic induction unit, each magnetic induction unit is accordingly embedded at described in one the gas that is open
In gap.
Wherein, the opening air gap is symmetrically disposed in the periphery of the magnetic core through hole.
Wherein, the magnetic core is cirque structure.
Wherein, the magnetic core includes the first magnetic core and the second magnetic core, and two opposite ends of first magnetic core are respectively provided with
One bends the extension for extending towards equidirectional, and two opposite ends of second magnetic core are respectively provided with one towards identical
The extension of the extension that direction bending extends, the extension of first magnetic core and second magnetic core is relative to be set
Put, the opening air gap is formed at the relative of the extension of the extension and second magnetic core of first magnetic core
Region.
Wherein, first magnetic core and second magnetic core are oppositely arranged in the length direction of the magnetic core, described
Opening air gap is arranged at the long side position of the magnetic core.
Wherein, including support member, the support member include the first support component, the second support body assembly, the 3rd
Support component and the 4th support component, wherein, first support component and second support component are longitudinally folded
Put, the 3rd support component and the 4th support component are longitudinally superimposed；First support body assembly and institute
State the laterally opposed setting of the 3rd support body assembly, second support component and the horizontal phase of the 4th support component
To arranging；
The first support component is respectively equipped with the stacked face of first support component and second support component
Recess and the second support component recess, the first support component recess and the second support component recess are formed
For setting the first magnetic core space of first magnetic core；
The 3rd support component is respectively equipped with the stacked face of the 3rd support component and the 4th support component
Recess and the 4th support component recess, the 3rd support component recess and the 4th support component recess are formed and are used for
Set the second magnetic core space of second magnetic core；
In first support component, second support component, the 3rd support component and described 4th
The zone line of support component be respectively equipped with longitudinally through groove, by first support component, described second
When support component, the 3rd support component and the 4th support component are stitched together, the groove is described
The zone line of support member formed longitudinally through support member through hole, the support member through hole and the magnetic core through hole
It is coaxially disposed.
Wherein, including external shielding case, the support member is embedded in the external shielding case, in the external shielding case
Shielding case through hole is provided with, and the external shielding case through hole is coaxially disposed with the support member through hole.
Wherein, inner shield shell is provided with the magnetic core through hole, the inner shield shell is at the both ends of longitudinal direction
Opening is provided with, the tested wire passes through the opening.
Wherein, the external shielding case and inner shield shell adopt permalloy or stalloy to make.
Wherein, the periphery in the stacked face of first support component and along the first support component recess is provided with
Locating slot, the periphery in the stacked face of second support component and along the second support component recess are provided with fixed
Position flange, the locating slot and the locating flange are engaged；
Periphery in the stacked face of the 3rd support component and along the 3rd support component recess is provided with positioning
Groove, the periphery in the stacked face of the 4th support component and along the 4th support component recess are provided with convex
Edge, the locating slot and the locating flange are engaged.
Wherein, including containment vessel, the magnetic core, the magnetic induction unit, the support member and the process list
Unit is embedded in the containment vessel.
Wherein, the magnetic induction unit adopts Hall magnetic induction unit, giant magnetoresistance effect element, Tunneling Magnetic Resistive
Inhibition effect element, anisotropic magnetoresistance element or giant magnetoresistance effect element.
Also a kind of measurement apparatus of the present invention, including current sensor, processor and display unit, the electric current are passed
The outfan of sensor is electrically connected with the input of the processor, and the outfan of the processor shows single with described
The input electrical connection of unit, it is characterised in that the current sensor is passed using the electric current that the present invention is provided
Sensor.
The invention has the advantages that：
The current sensor that the present invention is provided, obtains paired induced signal using paired magnetic induction unit, processes
Unit draws the current value for flowing through the tested wire by calculus of differences, can eliminate sensing letter by calculus of differences
Number deviation, induced signal is calibrated, the precision and capacity of resisting disturbance of current sensor is improve.And,
As calculus of differences can eliminate the deviation in magnetic field, even if there is deviation in tested wire, the also very little of the impact to precision,
Therefore, the current sensor is low using installation requirement, with more practicality.
Preferably, by magnetic induction unit described in each pair symmetrically located at the outside of the tested wire, i.e., in magnetic field
Identical, the in opposite direction region of size arranges magnetic induction unit, and the induced signal size of acquisition is identical or essentially identical,
And it is in opposite direction, the measurement result that calculus of differences is obtained is more accurate, makes the precision of current sensor higher.
Preferably, current sensor includes magnetic core, and magnetic core can gather the magnetic for flowing through that the electric current of tested wire is produced
, magnetic induction part is arranged on into the opening air gap of magnetic core, magnetic induction unit senses the magnetic field after gathering, can enter
One step improves the accuracy and sensitivity of current sensor.
Preferably, the extension of the first magnetic core and the second magnetic core is oppositely arranged, opening air gap is arranged at into magnetic
The long side position of core, relative to the opening air gap for being arranged on magnetic core minor face, be open shadow of the gap position by magnetic core turning
Sound is less, and evenly, the induced signal that magnetic induction unit is obtained is more accurate, and the precision of current sensor is higher in magnetic field.
Preferably, the extension of the first magnetic core is identical with the length of the extension of the second magnetic core, and will be open air gap
The symmetrical centre of magnetic core is arranged on, the precision of current sensor is higher.
Preferably, support member is spliced by four support components, so that support member and magnetic core, magnetic induction unit
Assembling and current sensor it is more flexible in the installation using scene, user is using more convenient.
Preferably, external shielding case is set in the outside of support member, the maskable external magnetic field of shielding case reduces extraneous
Impact of the magnetic field to magnetic induction unit, so as to improve the precision of current sensor.
It is highly preferred that the inwall in support member through hole is provided with inner shield shell, inner shield shell not only can reduce outer magnetic
Impact of the field to magnetic induction unit, can also calibrate to the magnetic field for flowing through the electric current generation of tested wire, from
And improve the precision of current sensor.
Preferably, by be symmetricly set on the first support component and the second support component stacked face locating slot and
First support component and the second support component rapidly and accurately can be stitched together by locating flange, by symmetrically setting
The locating slot and locating flange for putting stacked face in the 3rd support component and the 4th support component can be by the 3rd support
Component and the 4th support component are rapidly and accurately stitched together.
Description of the drawings
Fig. 1 is a kind of structural representation of closed-loop current sensors；
Fig. 2 a are the structural representation of current sensor provided in an embodiment of the present invention；
The structural representation of the current sensor that Fig. 2 b are provided for another embodiment of the present invention；
Fig. 3 is the structural representation of magnetic core provided in an embodiment of the present invention；
Fig. 4 is the structural representation of support member provided in an embodiment of the present invention；
The assembling schematic diagram of Fig. 5 magnetic cores provided in an embodiment of the present invention and support member；
Fig. 6 is the structural representation of external shielding case provided in an embodiment of the present invention.
Specific embodiment
To make those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings to this
The current sensor and measurement apparatus of bright offer is described in detail.
As shown in Figure 2 a, the current sensor that the present embodiment is provided includes a pair of magnetic induction units 13 and processes single
Unit 18, the outfan of the input electrical connection magnetic induction unit 13 of processing unit 18, wherein, magnetic induction unit
The magnetic field acquisition sensing letter corresponding with magnetic field size that 13 electric currents for flowing through tested wire 19 for sensing are produced
Number (voltage signal or current signal)；Processing unit 18 is drawn by calculus of differences and flows through tested wire 19
Current value, can eliminate the deviation of induced signal using calculus of differences, induced signal is calibrated, and can improve electric current
The precision and capacity of resisting disturbance of sensor.The deviation that calculus of differences can eliminate magnetic field is additionally, since, even if tested lead
There is deviation in line, the also very little of the impact to precision, therefore, the current sensor is low using installation requirement, more
There is practicality.
In the present embodiment, although current sensor only arranges a pair of magnetic induction units 13, but the present invention not office
It is limited to this.In fact, current sensor may also include multipair magnetic induction unit 13.By multipair magnetic induction unit
13 obtain multipair induced signal, then carry out comprehensive analysis, and the precision of current sensor can be made higher.
Preferably, each pair magnetic induction unit 13 is symmetrically disposed in the outside of tested wire 19, i.e., big in magnetic field
Little identical, in opposite direction region arranges magnetic induction unit 13, and the induced signal size of acquisition is identical or essentially identical,
And it is in opposite direction, the measurement result that Jing calculus of differencess are obtained is more accurate, makes the precision of current sensor higher.In addition,
Multipair magnetic induction unit 13 is symmetrically disposed in into the outside of tested wire 19, current sense is can further improve
The precision of device.
The structural representation of the current sensor that Fig. 2 b are provided for another embodiment of the present invention.As shown in Figure 2 b,
Current sensor includes magnetic core 11, support member 12, magnetic induction unit 13 and processing unit 18.Magnetic core 11 is used
In the magnetic field for gathering the electric current generation for flowing through tested wire, support member 12 is used to support fixed magnetic core 11, magnetic strength
Unit 13 is answered for sensing magnetic field that electric current in tested wire produces and exporting induced signal, the induced signal with
Magnetic induction is directly proportional, and processing unit 18 is used to process induced signal, and draws according to induced signal tested
Size of current in wire.
In the present invention, magnetic core 11 can be integrative-structure, and Split type structure may also be employed.Tied with split below
Describe in detail as a example by the magnetic core of structure.With reference to reference to Fig. 2 b and Fig. 3, magnetic core 11 includes the first magnetic core 11a
With the second magnetic core 11b, two opposite ends of the first magnetic core 11a are respectively provided with one and bend prolonging for extension towards equidirectional
Extending portion 11c, so as to the first magnetic core 11a for forming " u "-shaped structure is in.Similarly, the second magnetic core 11b
Two opposite ends are respectively provided with one and the extension 11c for extending are bent towards equidirectional, so as to form " u "-shaped structure
The second magnetic core 11b.The extension of the extension of the first magnetic core 11a and the second magnetic core 11b is oppositely arranged, and
One is formed respectively in the opposed area of two extensions of two extensions and the second magnetic core 11b of the first magnetic core 11a
Opening air gap 15, and longitudinal direction (upper and lower is formed in the zone line of the first magnetic core 11a and the second magnetic core 11b
To) through the magnetic core through hole 16 of the magnetic core.That is, the air gap 15 that is open is formed at the periphery of magnetic core through hole 16.
During use, tested wire is arranged through the magnetic core through hole 16, and magnetic induction unit 13 is arranged at opening air gap 15,
And, each opening air gap 15 respectively arranges a magnetic induction unit 13.Magnetic core is using pcrmeability more than 5000
Magnetic material make, magnetic core 11 can by electric current produce magnetic field the magnetic line of force be collected at opening air gap 15 at.
And, pcrmeability is higher, is more conducive to the measurement of small-signal.
It is pointed out that in the present embodiment, two opening air gaps 15 are set on magnetic core 11, in fact,
Can according to requirements or the quantity that arranges on magnetic core 11 no less than magnetic induction unit 13 of required precision is opened
Implication gap 15, or the opening air gap 15 equal with the quantity of magnetic induction unit 13, each opening air gap are set
15 arrange a magnetic induction part 13.In addition, the length of two extension 11c of the first magnetic core 11a can be with
It is identical, it is also possible to different；Similarly, the length of two extension 11c of the second magnetic core 11b can with identical,
Can also be different.But when the first magnetic core 11a and the second magnetic core 11b are stitched together, be open air gap 15
Width it is unsuitable excessive.In practical application, the preferred length phase of two extension 11c of the first magnetic core 11a
Together, the length of two extension 11c of the second magnetic core 11b is identical, and two opening air gaps 15 are arranged at
The symmetric position of magnetic core 11, to make the magnetic field size at opening air gap 15 identical as much as possible.
It is highly preferred that the length of two extensions of two extensions and the second magnetic core 11b of the first magnetic core 11a
It is identical, so as to horizontal (left and right directions claims length direction) that opening air gap 15 is arranged at magnetic core 11 is symmetrical
Center, to improve the certainty of measurement of current sensor.
In addition, the set-up mode of the extension of the extension of the first magnetic core 11a and the second magnetic core 11b has two kinds,
First kind of way is that the extension of the extension of the first magnetic core 11a and the second magnetic core 11b is arranged on magnetic core 11
Length direction (laterally or claim left and right directions), i.e. longer sides of the extension for magnetic core 11, the first magnetic core 11a
With the laterally opposed settings of the second magnetic core 11b, opening air gap 15 is arranged on the long side of magnetic core 11.Second
Mode is the width that the extension of the extension of the first magnetic core 11a and the second magnetic core 11b is arranged on magnetic core 11
The shorter edge of direction (vertical paper direction), i.e. extension for magnetic core 11, the first magnetic core 11a and the second magnetic
Core 11b longitudinal directions (vertical paper direction) is oppositely arranged, and opening air gap 15 is arranged on the minor face of magnetic core 11.
It is preferred that adopt first kind of way, will the first magnetic core 11a extension and the second magnetic core 11b extension arrange
On the long side of magnetic core 11 because the magnetic field in magnetic core 11 in the long side position of magnetic core 11 than minor face position more
Uniformly, the measurement result that magnetic induction unit 13 is arranged on the long side of magnetic core 11 is more accurate.It should be noted that,
Magnetic field in magnetic core 11 referred herein than minor face evenly, is primarily directed to magnetic core 11 on the long side of magnetic core 11
The shorter situation of minor face, in grade, the air gap 15 that is now open relativelys close to the turning of magnetic core 11 to such as minor face
Position, magnetic field are more mixed and disorderly.If the minor face of magnetic core 11 is in Centimeter Level, even if opening air gap 15 is arranged on
The minor face of magnetic core 11, the magnetic field at the air gap 15 that is open are affected less by the turning of magnetic core 11, and be open air gap 15
The magnetic field at place is than more uniform.However, reliable way is that opening air gap 15 is arranged on the long side position of magnetic core 11
Put, and be located at lateral symmetry center.
Below so that magnetic induction unit 13 obtains voltage signal as an example, the current sensor that the present invention is provided is introduced
Operation principle.Two magnetic induction units 13 symmetrically at the opening air gap 15 of magnetic core 11, due to this two
At individual opening air gap 15, magnetic field is equal in magnitude and in opposite direction, therefore, two magnetic induction units 13 are sensed
Voltage signal size it is identical, but voltage signal one positive is negative, and for example, two voltage signals are VS1With-VS2,
Qie ∣ VS1∣=∣-VS2∣=V0.Two voltage signals are subtracted each other by processing unit 18, i.e. VS1-(-VS2)=2V0,
Thus the current value in tested wire can drawn.
When current sensor is affected by the external environment, at two opening air gaps 15, there is deviation in magnetic field, causes two
There is deviation delta V in the voltage signal that individual magnetic induction unit 13 is sensed, and for example, two voltage signals are VS1+ΔV
With-VS2Two voltage signals are subtracted each other by+Δ V, processing unit 18, i.e. (VS1+ΔV)-(-VS2+ Δ V)=2V0,
This shows that calculus of differences can offset impact of the external environment to current sensor, so as to improve the survey of current sensor
Accuracy of measurement.And, even if tested wire is placed in magnetic core through hole 16 has deviation, also can be transported by difference
Calculation is eliminated, so as to reduce the installation requirement of current sensor, convenient use.
In the present embodiment, support member 12 is used to support fixed magnetic core 11.For the ease of assembling and using,
Support member 12 can be using two support component splicings, it would however also be possible to employ more support components are spliced.Hereafter it is situated between
The support member for continuing is spliced by four support components.Specifically, with reference to reference to Fig. 2, Fig. 4 and Fig. 5,
Support member 12 includes the first support component 121, the second support body assembly 122, the 3rd support component 123 and
Four support components 124, wherein, the first support component 121 and 122 longitudinal direction of the second support component are (upper and lower) folded
Put, the 3rd support component 123 and 124 longitudinal direction of the 4th support component are (upper and lower) stacked；First support body assembly
121 and the 123 laterally opposed setting of the 3rd support body assembly, the second support component 122 and the 4th support component 124
Laterally opposed setting.
The first support component is respectively equipped with the stacked face of the first support component 121 and the second support component 122 recessed
Portion 125 and the second support component recess 126, the first support component recess 125 and the second support component recess 126
Formed for setting the first magnetic core space 129 of the first magnetic core 11a.In the 3rd support component 123 and the 4th
The stacked face of support component 124 is respectively equipped with the 3rd support component recess 127 and the 4th support component recess 128,
3rd support component recess 127 and the 4th support component recess 128 are formed for setting the of the second magnetic core 11b
Two magnetic core spaces 130.
In the first support component 121, the second support component 122, the 3rd support component 123 and the 4th support group
The zone line of part 124 be respectively equipped with longitudinally through groove 131, by the first support component 121, second
When support component 122, the 3rd support component 123 and the 4th support component 124 are stitched together, groove 131 exists
The zone line of support member 12 formed longitudinally through support member through hole 132, support member through hole 132 led to magnetic core
Hole 16 is coaxially disposed.
Periphery in the stacked face of the first support component 121 and along the first support component recess 125 is provided with locating slot
(not shown), in the stacked face of the second support component 122 and along the week of the second support component recess 126
Edge is provided with locating flange 134, and locating slot and locating flange 134 are engaged, the first support component 121 and second
Support component 122 can be positioned by locating slot and locating flange 134, be easy to splicing again.
Periphery in the stacked face of the 3rd support component 123 and along the 3rd support component recess 127 is provided with positioning
Groove, the periphery in the stacked face of the 4th support component 124 and along the 4th support component recess 128 are provided with convex
Edge 134, locating slot and locating flange 134 are engaged, the 3rd support component 123 and the 4th support component 124
Position and both positioned by locating slot and locating flange 134, be easy to splicing again.
In another embodiment of the invention, current sensor also includes external shielding case.With reference to Fig. 2, external shield
Shell 14 can be arranged at the outside of support member 12 in several ways, such as using the parcel of external shielding case 14
Support member 1 is wrapped up in, or support member 12 is embedded in external shielding case 14.Utilization external shielding case described herein 14 is wrapped
Wrap up in the mode of support member 12.Specifically, external shielding case 14 includes barricade 141,142 and of lower barricade
Side shield plate 143, upper barricade 141 and lower barricade 142 are respectively by the upper surface located at support member 12 with
Surface, is provided with external shielding case through hole 144, external shielding case through hole on upper barricade 141 and lower barricade 142
144 set location is relative with the position of support member through hole 132, and external shielding case through hole 144 is led to support member
Hole 132 is coaxially disposed.And, the inner size of external shielding case through hole 144 is slightly larger than or is equal to support member through hole
Internal diameter size.Preferably, the inner size of external shielding case through hole 144 is equal to the internal diameter size of support member through hole,
Magnetic induction unit 13 is affected to reduce external magnetic field, so as to improve the precision of current sensor.Side shield plate 143
It is that the board material splice bent by two panels is formed.In order to external shielding case 14 rapidly and accurately can be arranged on support
The outside of part 12, is provided with multiple location hole (not shown)s on external shielding case 14, accordingly, is propping up
Locating dowel 135 is set in support member 12, and location hole and locating dowel 135 are engaged.In order to further improve external shield
The shield effectiveness of shell 14, current sensor include multilamellar external shielding case, and multilamellar external shielding case is nested in one successively
Rise.In addition, upper barricade 141 can be integrative-structure sheet material, it would however also be possible to employ multi-sheets are spliced.
Similarly, lower barricade 142 and side shield plate 143 can be equally integrative-structure sheet material respectively, or by polylith
Board material splice is formed.
Current sensor also includes inner shield shell, and, in magnetic core through hole, inner shield shell is in longitudinal side for inner shield shell
The both ends of (above-below direction) are provided with opening, tested wire passes through opening.Inner shield shell can make one
Structure, or it is spliced by polylith barricade.Inner shield shell not only can reduce external magnetic field to magnetic induction
The impact of unit, can also calibrate the magnetic direction for flowing through that the electric current of tested wire is produced, so as to improve electric current biography
The precision of sensor.
In the present embodiment, external shielding case and inner shield shell adopt the high permeability material system such as permalloy or stalloy
Make.
It should be noted that, external shielding case 14 and inner shield shell can adopt permalloy or stalloy to make.Magnetic
Sensing unit 13 using Hall magnetic induction unit, giant magnetoresistance effect element, Tunneling Magnetoresistance element,
Anisotropic magnetoresistance element or giant magnetoresistance effect element etc..In addition, relative to Hall magnetic induction unit, it is huge
Magneto-resistive effect element, Tunneling Magnetoresistance element, anisotropic magnetoresistance element or giant magnetoresistance effect unit
More preferably, noise resisting ability is higher for the sensitivity of part.
In one more embodiment of the present invention, current sensor also include shell, magnetic core 11, support member 12,
Magnetic induction unit 13, external shielding case 14, inner shield shell and processing unit 18 are embedded in containment vessel.Containment vessel
Cannot be only used for protect magnetic core 11, support member 12, magnetic induction unit 13, external shielding case 14, inner shield shell and
Processing unit 18, can also improve the aesthetics of current sensor.
In addition, the present invention also provides a kind of measurement apparatus, including current sensor, processor and display unit,
Current sensor is used to obtain the current value in tested wire, and processing unit is used to process current value, display unit
For showing current value.The outfan of current sensor is electrically connected with the input of processor, the output of processor
End is electrically connected with the input of display unit.Any one electric current that current sensor is provided using above-described embodiment
Sensor.
The measurement apparatus that the present invention is provided can be used for leakage current monitoring, transmission line of electricity current monitoring, household electrical appliance electricity
The fields such as stream detection, thunder-strike current monitoring, automobile circuit, Internet of Things, intelligent broadband, which has certainty of measurement
The advantages of high, strong antijamming capability and bandwidth.
It is understood that the embodiment of above principle being intended to be merely illustrative of the present and adopt it is exemplary
Embodiment, but the invention is not limited in this.For those skilled in the art, not
In the case of departing from spirit and substance of the present invention, various modifications and improvement can be made, these modifications and improvement
It is also considered as protection scope of the present invention.
Claims (15)
1. a kind of current sensor, including the magnetic induction unit and processing unit that are arranged on the outside of tested wire,
The magnetic induction unit flows through the magnetic field of the electric current generation of the tested wire and obtains big with magnetic field for sensing
Little corresponding induced signal；The input of the processing unit electrically connects the outfan of the magnetic induction unit, its
For processing the induced signal, it is characterised in that at least one pair of magnetic induction unit on the outside of the tested wire, institute
Processing unit is stated according to the paired induced signal and is drawn by calculus of differences and flow through the tested wire
Current value.
2. current sensor according to claim 1, it is characterised in that magnetic induction unit described in each pair
Symmetrically located at the outside of the tested wire.
3. current sensor according to claim 1, it is characterised in that including magnetic core, in the magnetic
The central area of core is provided with magnetic core through hole, is provided with opening air gap in the periphery of the magnetic core through hole, described tested to lead
Line is arranged through the magnetic core through hole, and the quantity of the opening air gap is equal with the quantity of the magnetic induction unit,
Each magnetic induction unit is accordingly embedded at described in one and is open in air gap.
4. current sensor according to claim 3, it is characterised in that the opening air gap is symmetrically
It is arranged on the periphery of the magnetic core through hole.
5. current sensor according to claim 3, it is characterised in that the magnetic core is annular knot
Structure.
6. current sensor according to claim 3, it is characterised in that the magnetic core includes the first magnetic
Core and the second magnetic core, two opposite ends of first magnetic core are respectively provided with one and the extension for extending are bent towards equidirectional
Portion, two opposite ends of second magnetic core are respectively provided with one and bend the extension for extending towards equidirectional, and described the
The extension of the extension of one magnetic core and second magnetic core is oppositely arranged, and the opening air gap is formed at described the
The opposed area of the extension of the extension of one magnetic core and second magnetic core.
7. current sensor according to claim 6, it is characterised in that first magnetic core and described
Second magnetic core is oppositely arranged in the length direction of the magnetic core, and the opening air gap is arranged at the long side of the magnetic core
Position.
8. current sensor according to claim 6, it is characterised in that including support member, described
Support member includes the first support component, the second support body assembly, the 3rd support component and the 4th support component, wherein,
First support component and second support component are longitudinally superimposed, the 3rd support component and the described 4th
Support component is longitudinally superimposed；First support body assembly and the laterally opposed setting of the 3rd support body assembly,
Second support component and the laterally opposed setting of the 4th support component；
The first support component is respectively equipped with the stacked face of first support component and second support component
Recess and the second support component recess, the first support component recess and the second support component recess are formed
For setting the first magnetic core space of first magnetic core；
The 3rd support component is respectively equipped with the stacked face of the 3rd support component and the 4th support component
Recess and the 4th support component recess, the 3rd support component recess and the 4th support component recess are formed and are used for
Set the second magnetic core space of second magnetic core；
In first support component, second support component, the 3rd support component and described 4th
The zone line of support component be respectively equipped with longitudinally through groove, by first support component, described second
When support component, the 3rd support component and the 4th support component are stitched together, the groove is described
The zone line of support member formed longitudinally through support member through hole, the support member through hole and the magnetic core through hole
It is coaxially disposed.
9. current sensor according to claim 8, it is characterised in that including external shielding case, described
Support member is embedded in the external shielding case, and shielding case through hole, and the external screen are provided with the external shielding case
Cover shell through hole to be coaxially disposed with the support member through hole.
10. current sensor according to claim 9, it is characterised in that set in the magnetic core through hole
There is inner shield shell, the inner shield shell is provided with opening at the both ends of longitudinal direction, and the tested wire is passed through
The opening.
11. current sensors according to claim 10, it is characterised in that the external shielding case and interior
Shielding case adopts permalloy or stalloy to make.
12. current sensors according to claim 8, it is characterised in that in first support component
Stacked face and the periphery along the first support component recess is provided with locating slot, in second support component
The stacked face and periphery along the second support component recess is provided with locating flange, the locating slot and the positioning
Flange is engaged；
Periphery in the stacked face of the 3rd support component and along the 3rd support component recess is provided with positioning
Groove, the periphery in the stacked face of the 4th support component and along the 4th support component recess are provided with convex
Edge, the locating slot and the locating flange are engaged.
13. current sensors according to claim 8, it is characterised in that including containment vessel, the magnetic
Core, the magnetic induction unit, the support member and the processing unit are embedded in the containment vessel.
14. current sensors according to claim 1, it is characterised in that the magnetic induction unit is adopted
Hall magnetic induction unit, giant magnetoresistance effect element, Tunneling Magnetoresistance element, anisotropic magnetoresistance unit
Part or giant magnetoresistance effect element.
A kind of 15. measurement apparatus, including current sensor, processor and display unit, the current sensor
Outfan electrically connect with the input of the processor, the outfan of the processor and the display unit
Input is electrically connected, it is characterised in that the current sensor is using described in claim 1-14 any one
Current sensor.
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| CN201510624134.5A CN106556730A (en) | 2015-09-27 | 2015-09-27 | Current sensor and the measurement apparatus comprising the current sensor |
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| CN201510624134.5A CN106556730A (en) | 2015-09-27 | 2015-09-27 | Current sensor and the measurement apparatus comprising the current sensor |
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| CN111157776A (en) * | 2020-01-14 | 2020-05-15 | 清华大学 | Double-magnetic-core sensor for insulation leakage current of power equipment |
| CN111157777A (en) * | 2020-01-14 | 2020-05-15 | 清华大学 | Design method of double-magnetic-core differential leakage current measurement sensor |
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