CN202661526U - Coaxial double-loop magnetic core coil assembly for core-through type high precision closed-loop type Hall current sensor - Google Patents
Coaxial double-loop magnetic core coil assembly for core-through type high precision closed-loop type Hall current sensor Download PDFInfo
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- 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
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- 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
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/207—Constructional details independent of the type of device used
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Abstract
The utility model belongs to the magnetic core coil assembly field for a Hall current sensor and discloses a coaxial double-loop magnetic core coil assembly for the core-through type high precision closed-loop type Hall current sensor. The coaxial double-loop magnetic core coil assembly for the core-through type high precision closed-loop type Hall current sensor comprises two annular magnetic cores with identical dimensions and a framework, wherein the two annular magnetic cores are coaxially mounted at upper and lower surfaces of the framework, each annular magnetic core is provided with n air gaps, the n air gaps are in symmetrical or uniform distribution at the annular magnetic core, and the 2n air gaps are in staggered, or symmetrical or uniform distribution at the whole coaxial double-loop. Arithmetic average of output voltage of 2n Hall elements is calculated, or arithmetic average of output voltage of the n Hall elements in each loop is calculated and then summation is carried out. The coaxial double-loop magnetic core coil assembly further comprises a secondary coil winding which is wound on the framework; the framework is mounted on and the coil winding is connected with a printed circuit board; the Hall elements at a lower layer are directly connected with the printed circuit board; and the Hall elements at an upper layer are connected with the printed circuit board through a conversion printed board. The coaxial double-loop magnetic core coil assembly has advantages of larger measuring scope, more precise effect and less cost.
Description
Technical field
The present invention relates to a kind of Hall current sensor magnetic core coil assembly, is a kind of core-theaded type high precision closed loop type Hall current sensor with coaxial double loop magnetic core coil assembly specifically.
Background technology
Non-cpntact measurement and method for supervising to electric current are a lot, and Hall current sensor forms industrialization because its excellent cost performance is widely used; Hall current sensor has open loop, two kinds of mode of operations of closed loop usually, the closed-loop type Hall current sensor is a kind of novel current sensor, have the characteristics such as bandwidth, good linearity, electricity isolation, cost performance are high, easy to use, be widely used in various Semiconductor Converting Technologies, interchange numerical control device etc. and do in the automatic control field of measurement and monitoring object with electric current.
The magnetic core with air gap that the closed-loop type Hall current sensor is made by Hall element, soft magnetic material, secondary coil winding, suitable power amplifier circuit form.Its principle of work is: the degree of the magnetic induction density that the magnetic induction density counteracting primary current ampere turns NpIp that produces with secondary current ampere turns NsIs in the Hall element detection magnetic core air gap produces when reaching mobile equilibrium, in the ideal situation, has:
NpIp-NsIs=0 ……(1)
Because its course of work of this current sensor is large close loop negative feedback loop structure, so be called the closed-loop type Hall current sensor.
By Biot in the electromagnetics. Sa cuts down Er Dinglv as can be known, and the magnetic induction density B around the endless current－carrying conductor is directly proportional with size of current I, and r is inversely proportional to distance, namely
Therefore when the current－carrying conductor of tested electric current in magnetic core during the shift position, varying in size of the magnetic induction density that produces in magnetic core air gap just produced site error, Here it is single magnetic core, single air gap closed-loop type current sensor original reason error.In addition, also there is following problem in this magnetic structure:
1, the closed-loop type Hall current sensor generally adopts iron-nickel alloy band or the riveting of cold punching sheet to rush lamination or be wound into toroidal core, and the cross section of toroidal core is square, adds sheath, and coil tracks is long, and internal resistance is large; The linear sensor measurement range is little, the antisaturation ability; For reducing Coil resistance, the overstriking wire diameter had both increased the volume and weight of sensor, was unfavorable for the sensor miniaturization, consumed again more copper materials, and the sensor cost is increased.
2, this structure fundamentally do not solve the remanent magnetism problem of magnetic core, particularly many control system in time the sensor power supply lag behind monitored electric current, namely have first monitor current then to add the sensor power supply.The remanent magnetism problem of magnetic core is more outstanding in this case, and along with the remanent magnetism of passage of time magnetic core increases in accumulation.Adopt single magnetic circuit, a 2n air gap and Hall element, the Hall element output terminal is adopted the summing mode processing signals, effectively solve the impact large on the current measurement precision of magnetic core remanent magnetism and site error, but increasing of air gap number, under same current number of turn condition, magnetic induction density reduces at double in the air gap, the measurement lower limit of sensor and lowest resolution variation, thus affected current measurement span and the versatility of sensor.Its measurement range is 1.5-2 times of rated current, and precision is preferably 1.0%FS, and-3db bandwidth is 0-150KHZ.
When 3, inserting Hall element in the magnetic core air gap of magnetic core coil assembly, can't guarantee the setting height(from bottom) consistance, affect the sensor performance consistance; During debugging, the regulating winding number of turn is namely consuming time artificially, and is bothersome again.
4, the magnetic core coil assembly is difficult for installing and fixing with pcb board, has reduced widely sensor batch production consistance, has affected the reliability of production efficiency and sensor.
Summary of the invention
In order to solve the problems of the technologies described above, the object of the present invention is to provide a kind of measurement range larger, more accurately, more cost-effective core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil assembly.
Complete skill scheme of the present invention is, a kind of core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil assembly, comprise two measure-alike toroidal cores and a skeleton, the coaxial upper and lower surface that is installed in described skeleton of described two toroidal cores, be provided with n air gap on described each toroidal core, a described n air gap or symmetrical or divide equally each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop; Be provided with a Hall element in described each air gap;
Described skeleton also comprises two skeleton cover plates, and described skeleton cover plate is separately positioned on the outside of described two toroidal cores; Described skeleton cover plate corner is chamfering;
Also comprise a secondary coil winding, described secondary coil winding is on described skeleton;
Described skeleton is installed, coil winding is connected on the printed circuit board, Hall element in the toroidal core air gap of described lower floor directly is connected with described printed circuit board, and the Hall element in the toroidal core air gap on described upper strata is connected with described printed circuit board by a conversion printed board;
Also be provided with a slot on the side of described skeleton and communicate with the toroidal core air gap, the conversion printed board is inserted in the slot.Be 300AT when following in turn ratio 1:3000T, rated current, two measure-alike toroidal cores of single air gap are installed up and down on skeleton and air gap is divided equally coaxial double loop, and described toroidal core is made with nickeliferous iron-nickel alloy more than 80%.
Rush lamination with the cold punching sheet riveting of different in width on the described toroidal core and go out to be with magnetic core pilot hole and air gap reference column.
Locating slot, the reference column corresponding with magnetic core air gap reference column, pilot hole all arranged and divide equally the assembly fixed orifice of loop at loop up and down on the described skeleton.
Be 500AT when above in turn ratio 1:5000T, rated current, described toroidal core forms with the ultracrystallite tape wrapping.
The thickness in described ultra micro crystal zone is 0.03-0.05mm.
The output voltage of a described 2n Hall element asks the output voltage of n Hall element in arithmetic mean or each loop to ask first arithmetic mean to sue for peace again.
Described n equals 1 or 2.
The spacing of the thickness of described toroidal core and two toroidal cores is more than or equal to 2 times width of air gap and more than or equal to 1/4 semi-major axis in the described toroidal core.
The magnetic core air gap grid spacer is all arranged and have the assembly fixed leg of dividing equally loop more than three at least at loop up and down on the described skeleton.
Be provided with welding hole or fixed orifice that the size with described assembly fixed orifice or fixed leg matches in the described printed board.
Described toroidal core and corresponding skeleton are circular square or special-shaped.
Therefore the present invention has compared following beneficial effect with present technology:
The invention provides a kind of magnetic core coil assembly of coaxial double loop structure.Toroidal core by the 2D height is divided into two, become the toroidal core of two D height of processing, the toroidal core position that air gap is guaranteed in coaxial installation about skeleton, the consistance of width and Hall element setting height(from bottom), improved the consistance of core-theaded type closed-loop type Hall current sensor, reliability, be provided with n air gap on each toroidal core simultaneously, n air gap or symmetrical or divide equally each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop, the output voltage of 2n Hall element asks the output voltage of n Hall element in arithmetic mean or each loop to ask first arithmetic mean to sue for peace again, in theory both eliminated the remanent magnetism of magnetic core to the impact of the measuring accuracy of current sensor, eliminate again original reason error---the site error of core-theaded type closed-loop type Hall current sensor, improved widely the current measurement precision of core-theaded type closed-loop type Hall current sensor; Cover plate and skeleton with chamfering on the skeleton match, and make assembly under identical magnetic core size, wire diameter, number of turn condition, the coiling shortest path, and Coil resistance is minimum, has improved linear measurement range and the antisaturation ability of closed-loop type Hall current sensor; Be provided with position, interconnective hole between printed circuit board and the skeleton, improved greatly consistance and the production efficiency of product, also improved the reliability of product simultaneously.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, does not consist of to improper restriction of the present invention, in the accompanying drawings:
Fig. 1 is the single gap structure synoptic diagram of the present invention;
Fig. 2 is the two gap structure synoptic diagram of the present invention.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the present invention in this illustrative examples of the present invention and explanation, but not as a limitation of the invention.
Embodiment 1:
A kind of core-theaded type high precision closed loop of present embodiment type Hall current sensor is with coaxial double loop magnetic core coil assembly, comprise two measure-alike toroidal cores and a skeleton, two coaxial upper and lower surfaces that are installed in skeleton of toroidal core, be provided with n air gap on each toroidal core, n air gap or symmetrical or divide equally each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop; N equals 1 in the present embodiment, as shown in Figure 1, two coaxial settings of toroidal core, and ° installation of air gap direction Rotate 180, be provided with a Hall element in each air gap, because its magnetic core sectional dimension is little, rush lamination one-tenth with the toroidal core of magnetic core pilot hole and air gap reference column with nickeliferous iron-nickel alloy more than 80% with the cold punching sheet riveting of different in width, for the impact of the leakage field that reduces air gap and guarantee good electromagnetic induction and coupling, the thickness of toroidal core is more than or equal to 2 times width of air gap and more than or equal to 1/4 semi-major axis in the toroidal core, and the spacing of magnetic core is more than or equal to 2 times width of air gap in the double loop; The output voltage of 2 Hall elements is asked arithmetic mean; Skeleton also comprises two skeleton cover plates, the skeleton cover plate is separately positioned on the outside of two toroidal cores, skeleton cover plate corner is chamfering, also comprise a secondary coil winding, the secondary coil winding matches with the skeleton cover plate on skeleton, makes the secondary coil winding under identical magnetic core size, wire diameter, number of turn condition, the coiling shortest path, Coil resistance is minimum; Locating slot, the reference column corresponding with magnetic core air gap reference column, magnetic core pilot hole all arranged and divide equally the assembly fixed orifice of loop at loop up and down on the skeleton, the welding hole that has the size with the assembly fixed orifice to match in the printed board, fixedly draw pin and pass fixed orifice on the plastic skeleton, the magnetic core coil assembly is installed on the wiring board, and the two ends of coil is directly welded in the circuit board; Hall element in the toroidal core air gap of lower floor directly is connected with printed circuit board, Hall element in the toroidal core air gap on upper strata is connected with printed circuit board by a conversion printed board, also be provided with a slot on the side of skeleton, the conversion printed board is inserted in the slot.
Embodiment 2:
The difference of present embodiment and embodiment 1 is, n=2 in this enforcement, and two magnetic cores are coaxial and the air gap direction half-twist is installed, and form toroidal core and make it into as a whole with glue with 0.03-0.05mm ultracrystallite tape wrapping; Be provided with a Hall element in each air gap, the output voltage of Hall element is that 2n Hall element asks the Hall element of arithmetic mean or each magnetic core to ask first arithmetic mean to sue for peace again, as shown in Figure 2, for the impact of the leakage field that reduces air gap and guarantee good electromagnetic induction and coupling, the thickness of toroidal core is more than or equal to 2 times width of air gap and more than or equal to 1/4 semi-major axis in the toroidal core, and the spacing of magnetic core is more than or equal to 2 times width of air gap in the double loop; Skeleton also comprises two skeleton cover plates, the skeleton cover plate is separately positioned on the outside of two toroidal cores, skeleton cover plate corner is chamfering, also comprise a secondary coil winding, the secondary coil winding matches with the skeleton cover plate on skeleton, makes the secondary coil winding under identical magnetic core size, wire diameter, number of turn condition, the coiling shortest path, Coil resistance is minimum; The magnetic core air gap grid spacer is all arranged and have the assembly fixed leg of dividing equally loop more than three at least at loop up and down on the skeleton, skeleton is connected on the printed circuit board, the welding hole or the fixed orifice that have the size with the assembly fixed leg to match in the printed board, with self-tapping screw that assembly is fixing in the circuit board after coil winding is finished; Hall element in the toroidal core air gap of lower floor directly is connected with printed circuit board, Hall element in the toroidal core air gap on upper strata is connected with printed circuit board by a conversion printed board, also be provided with a slot on the side of skeleton, the conversion printed board is inserted in the slot.
The present invention also takes following technique measures:
(1) the present invention adopts the magnetic core coil assembly of coaxial double loop structure, when loop magnetic core list air gap, toroidal core by nickeliferous more than 80% the iron-nickel alloy band or lamination is rushed in the riveting of cold punching sheet or coiling forms; When with the even number air gap, toroidal core is by nickeliferous 50% iron-nickel alloy band or lamination is rushed in the riveting of cold punching sheet or coiling forms, and is the bandwidth that improves sensor, and the thickness of iron-nickel alloy band is 0.03-0.3mm.
(2) Effective permeability
Such as Fig. 1, be μ for magnetic permeability, width of air gap is the magnet ring of g, L is the average length of magnetic path of magnet ring.Its Effective permeability is:
Usually, μ " 1000, L " g, then have:
If when magnet ring is divided equally the air gap of n same widths, have:
According to (1) formula, in the ideal situation, whether the sensitivity of open loop enlargement factor, Hall element that refers to magnetic permeability, the amplifier of the used soft magnetic material of magnetic core is very large, and in fact above parameter is finite value, particularly the magnetic permeability of soft magnetic material, although (3) formula has the error of 10%-20%, but still can illustrate, with the magnetic core of air gap no matter the magnetic permeability of its material how highly have, its Effective permeability is low a lot, and the width of air gap is larger, and its Effective permeability is lower.Therefore, for the toroidal core of closed-loop type Hall current sensor, its width of air gap or quantity are the smaller the better, usually n=1,2.
Toroidal core up and down coaxial installation on fixed mount for highly being D, a n air gap such as figure one, figure two, in order to ensure magnetic induction density homogeneity in the air gap and the impact that reduces the leakage field of air gap, must make D 〉=2g, d 〉=2g.For guaranteeing good electromagnetic induction and coupling, must make the height D 〉=1/4b of every loop magnetic core; At the a=b=R(annular) time, D 〉=1/4R.
(3) ask arithmetic mean to eliminate original reason error---site error.
At figure one, among the figure two, cause varying in size of magnetic induction density B in the air gap because tested electric current current－carrying conductor position in feedthrough hole is different, produced different Hall voltages, have:
V
H=S
HI
CB ……(4)
S in the formula
H, I
CBe respectively sensitivity and the working current of Hall element in the air gap
B is the magnetic induction density that tested electric current produces in air gap
This voltage after circuit is asked arithmetic mean, is had:
In figure one.
V
H1=0.5(S
H11I
C11B
11+S
H12I
C12B
12) ……(5)
B in the formula
11, B
12Be respectively the magnetic induction density of tested electric current in two air gaps, S
H11, S
H12, I
C11, I
C12Be respectively sensitivity and the working current of Hall element in two air gaps.
By the Hall effect principle as can be known, Hall voltage is that the charge carrier by motion is subjected to external magnetic field and changes the accumulation of the positive and negative charge q that direction of motion produces at two-plate, this with charging after the plane-parallel capacitor fairly similar. and the capacitor C of plate condenser=ε s/a; The Hall element of two same package has almost identical DIELECTRIC CONSTANT ε, and polar plate area s and apart from a has same capacitance. and therefore the output voltage of two Hall elements asks arithmetic mean by parallel plate capacitor equivalence in parallel through circuit, has
V
H1=u=q/c=(q
11+q
12)/(c
11+c
12)，c
11＝c
12＝c
1。
When tested electric current current－carrying conductor position in feedthrough hole is different, act on the different and quantity of electric charge q that produces of magnetic induction density B on the Hall element
11, q
12Difference has:
V
H1=u=q/c=(q
11+q
12)/2c
1＝0.5(q
11/c
1+q
12/c
1)
=0.5(v
H11+v
H12)
=0.5(S
H11I
C11B
11+S
H12I
C12B
12) ……(6)
By (5), (6) formula as can be known, it is in parallel that a plurality of Hall voltages ask the disposal route of arithmetic mean to be equivalent to a plurality of Hall element output terminals through circuit.
In figure two, in like manner have:
V
H2=0.25(S
H21I
C21B
21+S
H22I
C22B
22+S
H23I
C23B
23+S
H24I
C24B
24)
……(7)
From (5), (6), (7) as can be known, a plurality of Hall voltages are asked the disposal route of arithmetic mean through circuit, have eliminated in theory original reason error------the position amount error of core-theaded type closed loop Hall current sensor.A Hall element is installed in each air gap, and the quantity of air gap and Hall element is more, ask arithmetic mean after, positional error compensation is more thorough, the linearity, the precision of core-theaded type closed loop Hall current sensor are better.But general the employing in every loop in the practical application, even number air gap and Hall element, with the remanent magnetism of the offsetting magnetic core impact on the current measurement precision, take into account simultaneously measuring accuracy and measure the resolution lower limit, adopt in the same loop air gap Hall element output terminal to ask arithmetic mean, hall element output voltage summation processing mode in the air gap makes measuring accuracy and differentiates the lower limit optimization in the different loops.
(4) span of current measurement and lower limit
In figure one, we regard it highly as for the magnetic core of 2D is divided into highly as D, single width of air gap are two measure-alike magnetic cores of g, the coaxial and air gap direction Rotate 180 ° installation of two magnetic cores; In figure two, it is regarded as highly for a magnetic core of the air gap in the every limit of 2D is divided into highly as D, symmetric double width of air gap are two measure-alike magnetic cores of g, two magnetic core is coaxial and the air gap direction half-twist is installed.When the current－carrying conductor of endless in the feedthrough hole optional position, its coordinate is (x.y), for the magnetic circuit that is installed in lower floor, according to Biot. Sa cuts down Er Dinglv and can prove, magnetic induction density B in its air gap=μ I/2 π r still sets up, so we are placed on it in the same coordinate system and process.
The output voltage of the Hall element the when output voltage of the Hall element during to the two air gap of single magnetic core is sued for peace with coaxial bimag list air gap asks arithmetic mean to compare, and for the ease of relatively, supposes the Hall element sensitivity S
H, working current I
CIdentical (in fact to accomplishing after the pairing of Hall element stepping) has:
With (3) substitution (8) formula
At this moment, noise voltage is Ve in the output voltage of Hall element, after asking arithmetic mean is:
∑V
e1=2V
e ……(10)
Sue for peace again after arithmetic mean is asked in Hall element output when the output voltage of the Hall element during contrast single magnetic core four air gap is sued for peace with the two air gap of the every loop of coaxial bimag, have:
ΣV
e2=4V
e ……(14)
From theory, coaxial many loops core structure is feasible, but in actual applications, will consider not only whether actual installation is convenient feasible, whether can manufacture, and also need consider manufacturing cost, generally adopts coaxial double loop core structure.
From (17), (18) formula as can be known, compare with the output voltage summation processing mode of Hall element under Hall element and air gap quantity the same terms, both guaranteed that the level of sensitivity of current sensor is identical, make again that the offset voltage of Hall element and temperature are floated, output noise etc. all descends
Doubly, make the linearity, precision, temperature stability etc. of core-theaded type closed-loop type Hall current sensor that large raising arranged, the current sensor measurement lower limit has been reduced
Doubly; Be the closed-loop type Hall current sensor of 25A for minimum rated current, be all V at the output noise voltage of Hall element
eCondition under, the minimum specified current reduction of this current sensor
Doubly, the minimum rated current of closed-loop type current sensor is at this moment
Realize the electric current core-theaded type high-acruracy survey to be measured of 10AT; The measurement span of this current sensor has been improved
Doubly.
Beneficial effect of the present invention
1, the present invention provides a kind of magnetic core coil assembly of coaxial double loop structure.Toroidal core by the 2D height is divided into two, and becomes the toroidal core of two D height of processing, and the weight of used core material and Hall element quantity are constant, can not increase considerably extra cost; The consistance of position, width and the Hall element setting height(from bottom) of air gap is guaranteed in toroidal core coaxial installation about skeleton, has improved consistance, the reliability of core-theaded type closed-loop type Hall current sensor.Iron-nickel alloy with nickeliferous 80% rushes lamination one-tenth with the toroidal core of magnetic core pilot hole and air gap reference column with the cold punching sheet riveting of different in width, cover plate with chamfering on the skeleton matches with it, make assembly under identical magnetic core size, wire diameter, number of turn condition, the coiling shortest path, Coil resistance is minimum, has improved linear measurement range and the antisaturation ability of closed-loop shaped Hall current sensor.
2,2 air gaps or symmetrical or divide equally each toroidal core are eliminated the remanent magnetism of magnetic core to the impact of the measuring accuracy of current sensor; 4 air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop have reduced the site error of current－carrying conductor in feedthrough hole.
3, the output voltage of 4 Hall elements or ask in arithmetic mean or the every loop through circuit, the output voltage of 2 Hall elements asks first arithmetic mean to sue for peace through circuit again, has eliminated theoretically the original reason error-site error of Hall current sensor; From (17), (18) formula as can be known, compare with the output voltage summation processing mode of Hall element under Hall element and air gap quantity the same terms, both guaranteed that the level of sensitivity of current sensor is identical, make again that the offset voltage of Hall element and temperature are floated, output noise etc. all descends
Doubly, make the linearity, precision, temperature stability etc. of core-theaded type closed-loop type Hall current sensor that large raising arranged, the current sensor measurement lower limit has been reduced
Doubly; Be the closed-loop type Hall current sensor of 25A for minimum rated current, be all V at the output noise voltage of Hall element
eCondition under, the minimum specified current reduction of this current sensor
Doubly, the minimum rated current of closed-loop type current sensor is at this moment
Realize the electric current core-theaded type high-acruracy survey to be measured of 10AT; Also make the measurement span of this current sensor improve 2.828 times.Utilize the output summation of coaxial many loops core structure and Hall element and ask the utilization that combines of arithmetic mean mode, make the electric current realization core-theaded type high-acruracy survey to be measured of 10AT.
4, the two gap structures of the every magnetic core of coaxial double loop are so that the used soft magnetic material of this kind current sensor can select the low 0.03-0.05mm ultracrystallite tape wrapping of cost to form toroidal core and make it into as a whole with glue, be processed into two air gap magnetic cores, make core-theaded type closed-loop type Hall current sensor really accomplish good and cheap.
5, another patent of employing inventor application-a kind of high precision closed loop type Hall current sensor makes up with coaxial double loop magnetic core coil assembly with electronic circuit, make core-theaded type closed-loop type Hall current sensor precision reach 0.1%FS, its offset voltage temperature is floated and is reached 30ppm/ ℃～100ppm/ ℃, operation temperature area reaches-40～85 ℃, also make simultaneously the current sensor measurement span bring up to nearly 60 times from nearly 20 times ,-3db bandwidth is 0-300KHz.
Therefore, the invention provides a kind of magnetic core coil assembly of coaxial double loop structure.Toroidal core by the 2D height is divided into two, become the toroidal core of two D height of processing, the toroidal core position that air gap is guaranteed in coaxial installation about skeleton, the consistance of width and Hall element setting height(from bottom), improved the consistance of core-theaded type closed-loop type Hall current sensor, reliability, be provided with n air gap on each toroidal core simultaneously, n air gap or symmetrical or divide equally each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop, the output voltage of 2n Hall element asks the output voltage of n Hall element in arithmetic mean or each loop to ask first arithmetic mean to sue for peace again, in theory both eliminated the remanent magnetism of magnetic core to the impact of the measuring accuracy of current sensor, eliminate again original reason error---the site error of core-theaded type closed-loop type Hall current sensor, improved widely the current measurement precision of core-theaded type closed-loop type Hall current sensor; Cover plate and skeleton with chamfering on the skeleton match, and make assembly under identical magnetic core size, wire diameter, number of turn condition, the coiling shortest path, and Coil resistance is minimum, has improved linear measurement range and the antisaturation ability of closed-loop shaped Hall current sensor; Be provided with position, interconnective hole between printed circuit board and the skeleton, improved greatly consistance and the production efficiency of product, also improved the reliability of product simultaneously.
More than technical scheme that the embodiment of the invention is provided be described in detail, used specific case herein principle and the embodiment of the embodiment of the invention are set forth, the explanation of above embodiment is only applicable to help to understand the principle of the embodiment of the invention; Simultaneously, for one of ordinary skill in the art, according to the embodiment of the invention, all will change on embodiment and range of application, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil assembly, it is characterized in that, comprise two measure-alike toroidal cores and a skeleton, the coaxial upper and lower surface that is installed in described skeleton of described two toroidal cores, be provided with n air gap on described each toroidal core, a described n air gap or symmetrical or divide equally each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop; Be provided with a Hall element in described each air gap;
The output voltage of a described 2n Hall element asks the output voltage of n Hall element in arithmetic mean or each loop to ask first arithmetic mean to sue for peace again;
Described n equals 1 or 2;
Described skeleton also comprises two skeleton cover plates, and described skeleton cover plate is separately positioned on the outside of described two toroidal cores;
Described skeleton cover plate corner is chamfering;
Also comprise a secondary coil winding, described secondary coil winding is on described skeleton;
Described skeleton is installed, coil winding is connected on the printed circuit board, Hall element in the toroidal core air gap of described lower floor directly is connected with described printed circuit board, and the Hall element in the toroidal core air gap on described upper strata is connected with described printed circuit board by a conversion printed board;
Also be provided with a slot on the side of described skeleton and communicate with the toroidal core air gap, the conversion printed board is inserted in the slot.
2. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 1 is with coaxial double loop magnetic core coil assembly, it is characterized in that, be that 300AT is when following in turn ratio 1:3000T, rated current, two measure-alike toroidal cores of single air gap, install up and down on skeleton and air gap is divided equally coaxial double loop, described toroidal core is made with iron-nickel alloy.
3. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 2 is with coaxial double loop magnetic core coil assembly, it is characterized in that, rush lamination with the cold punching sheet riveting of different in width on the described toroidal core and go out to be with magnetic core pilot hole and air gap reference column.
4. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 1 is with coaxial double loop magnetic core coil assembly, it is characterized in that, be that 500AT is when above in turn ratio 1:5000T, rated current, described toroidal core forms with the ultracrystallite tape wrapping, and the thickness in described ultra micro crystal zone is 0.03-0.05mm.
5. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 1 is with coaxial double loop magnetic core coil assembly, it is characterized in that the spacing of the thickness of described toroidal core and two toroidal cores is more than or equal to 2 times width of air gap and more than or equal to 1/4 semi-major axis in the described toroidal core.
6. according to claim 1, arbitrary described a kind of core-theaded type high precision closed loop type Hall current sensor in 2,3 is with coaxial double loop magnetic core coil assembly, it is characterized in that locating slot, the reference column corresponding with magnetic core air gap reference column, pilot hole all being arranged and divide equally the assembly fixed orifice of loop at loop up and down on the described skeleton.
7. according to claim 1, arbitrary described a kind of core-theaded type high precision closed loop type Hall current sensor in 2,4 is with coaxial double loop magnetic core coil assembly, it is characterized in that the magnetic core air gap grid spacer all being arranged and have the assembly fixed leg of dividing equally loop more than three at least at loop up and down on the described skeleton.
8. arbitrary described a kind of core-theaded type high precision closed loop type Hall current sensor in according to claim 6 is with coaxial double loop magnetic core coil assembly, it is characterized in that, be provided with welding hole or fixed orifice that the size with described assembly fixed orifice or fixed leg matches in the described printed board.
9. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 1 is characterized in that with coaxial double loop magnetic core coil assembly, and described toroidal core and corresponding skeleton are circular or square.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200260414U CN202661526U (en) | 2012-01-19 | 2012-01-19 | Coaxial double-loop magnetic core coil assembly for core-through type high precision closed-loop type Hall current sensor |
| CN201280056650.7A CN104520721B (en) | 2012-01-19 | 2012-02-09 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
| PCT/CN2012/000154 WO2013106958A1 (en) | 2012-01-19 | 2012-02-09 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200260414U CN202661526U (en) | 2012-01-19 | 2012-01-19 | Coaxial double-loop magnetic core coil assembly for core-through type high precision closed-loop type Hall current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202661526U true CN202661526U (en) | 2013-01-09 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200260414U Expired - Lifetime CN202661526U (en) | 2012-01-19 | 2012-01-19 | Coaxial double-loop magnetic core coil assembly for core-through type high precision closed-loop type Hall current sensor |
| CN201280056650.7A Active CN104520721B (en) | 2012-01-19 | 2012-02-09 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280056650.7A Active CN104520721B (en) | 2012-01-19 | 2012-02-09 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN202661526U (en) |
| WO (1) | WO2013106958A1 (en) |
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| CN104931756A (en) * | 2015-05-25 | 2015-09-23 | 山东航天电子技术研究所 | Current sensor framework applicable to square face-to-face plugging magnetic cores |
| CN105548650A (en) * | 2014-10-27 | 2016-05-04 | 弗兰克公司 | Flexible current sensor |
| CN106706990A (en) * | 2017-02-28 | 2017-05-24 | 南京普肯传感科技有限公司 | Magnetic core air gap fixing structure assembly for core passing type Hall current sensor |
| CN108562774A (en) * | 2018-06-21 | 2018-09-21 | 山东航天电子技术研究所 | A kind of micro metal shell collection magnetic-type Hall current sensor |
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- 2012-01-19 CN CN2012200260414U patent/CN202661526U/en not_active Expired - Lifetime
- 2012-02-09 CN CN201280056650.7A patent/CN104520721B/en active Active
- 2012-02-09 WO PCT/CN2012/000154 patent/WO2013106958A1/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104520721B (en) | 2017-05-17 |
| CN104520721A (en) | 2015-04-15 |
| WO2013106958A1 (en) | 2013-07-25 |
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Assignee: Nanjing tuoken Electronic Technology Co., Ltd. Assignor: Zou Gaozhi Contract record no.: 2014320010090 Denomination of utility model: Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor Granted publication date: 20130109 License type: Exclusive License Record date: 20140528 |
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