CN104520721A - Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor - Google Patents
Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop 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
Abstract
The present invention belongs to the field of magnetic core coil components for a Hall current sensor. Disclosed is a coaxial dual-loop magnetic core coil component for a high-precision cross-core closed-loop Hall current sensor, including two annular magnetic cores with an identical size and a skeleton. The two annular magnetic cores are coaxially mounted on the upper and lower surfaces of the skeleton, with n air gaps being provided on each annular magnetic core; the n air gaps are either distributed symmetrically or distributed evenly on each annular magnetic core, and 2n air gaps are mounted in a staggered manner and are either distributed symmetrically or distributed evenly on the entire coaxial dual loop; the arithmetic mean value of the output voltages of 2n Hall elements is calculated or the arithmetic mean value of the output voltages of n Hall elements of each loop is first calculated and then summed; a secondary coil winding around the skeleton is also included; and the skeleton is mounted on and the coil winding is connected to a printed circuit board, with Hall elements at a lower layer being directly connected to the printed circuit board, and Hall elements at an upper layer being connected to the printed circuit board through a conversion printed board. The beneficial effects of the present invention are a larger measurement range, higher precision, and lower costs.
Description
Specification core-theaded type high precision closed loop type Hall current sensor is used
Coaxial double loop magnetic core coil component
Technical field is the present invention relates to a kind of Hall current sensor magnetic core coil component, and specifically a kind of core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil component.Background technology
Many to the non-cpntact measurement and monitoring method of electric current, Hall current sensor forms industrialization because being widely used its excellent cost performance；Hall current sensor generally has open loop, two kinds of mode of operations of closed loop, closed-loop type Hall current sensor is a kind of new current sensor, with bandwidth, good linearity, electric isolution, cost performance it is high, it is easy to use the features such as, be widely used in various Semiconductor Converting Technologies, exchange numerical control device etc. with electric current measure and the automatic control field of monitored object in.
The magnetic core with air gap that closed-loop type Hall current sensor is made up of Hall element, soft magnetic materials, secondary coil winding, appropriate power amplifier circuit are constituted.Its operation principle is：With the degree of the magnetic induction intensity produced by the magnetic induction intensity counteracting primary current number of ampere turns Nplp produced by secondary current number of ampere turns Ns l s in Hall element detection magnetic core air gap, when reaching dynamic equilibrium, in the ideal situation, have： Nplp-Ns l s=0 …… (1)
Due to this current sensor, its course of work is big close loop negative feedback loop structure, therefore is called closed-loop type Hall current sensor.
Biot Sas cut down your law in electromagnetism, and the magnetic induction density B around endless current－carrying conductor is directly proportional to size of current I, with being inversely proportional apart from r, i.e.,
2 r therefore when current－carrying conductor shift position in magnetic core of tested electric current, the magnetic induction intensity produced in magnetic core air gap it is of different sizes, site error is just generated, here it is single magnetic core, single air gap closed-loop type confirm this
Current sensor original reason error.In addition, this magnetic structure there is problems：
1st, closed-loop type Hall current sensor is typically rushed lamination or is wound into toroidal core using iron-nickel alloy band or cold punching piece riveting, and the section of toroidal core is square, and along with sheath, coil tracks are long, and internal resistance is big；Linear sensor measurement range is small, anti-saturation ability；To reduce Coil resistance, overstriking line footpath had both increased the volume and weight of sensor, and had been unfavorable for sensor miniaturization, and more copper materials are consumed again, made the increase of sensor cost.
2nd, this structure is without the remanent magnetism for fundamentally solving the problems, such as magnetic core, and sensor power supply lags behind monitored electric current to particularly many control systems in time, i.e., first have monitor current then to add sensor power supply.The remanent magnetism problem of magnetic core is more prominent in this case, and the remanent magnetism of passage magnetic core increases in accumulation over time.Using single magnetic circuit, 2n air gap and Hall element, summing mode process signal is used to Hall element output end, efficiently solve the influence of magnetic core remanent magnetism and site error to current measurement precision greatly, but air gap number increases, in the same current number of turn how under part, magnetic induction intensity is reduced at double in air gap, and the measurement lower limit and lowest resolution of sensor are deteriorated, so as to have impact on the current measurement span and versatility of sensor.Its measurement range is 1. 5-2 times of rated current, and precision is preferably 1. 0%FS, and -3db is with a width of 0-15 0KHZ.
When the 3rd, inserting Hall element in the magnetic core air gap of magnetic core coil component, it is impossible to ensure setting height(from bottom) uniformity, have impact on sensor performance uniformity；During debugging, artificially the regulating winding number of turn is to take, and bothersome.
4th, magnetic core coil component is difficult to install with pcb board and fixed, and greatly reduces sensor batch production uniformity, have impact on production efficiency and the reliability of sensor.
The content of the invention
In order to solve the above-mentioned technical problem, it is an object of the invention to provide a kind of measurement range bigger, more accurate, more cost-effective core-theaded type high precision closed loop type Hall current sensor with coaxial double loop magnetic core coil component.The present invention complete skill scheme be, a kind of core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil component, including two size identical toroidal cores and a skeleton, described two toroidal cores are coaxially mounted to set on the upper and lower surface of the skeleton, each toroidal core
There is a n air gap, the n air gap or symmetrical or respectively each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop；A Hall element is provided with each air gap；
The skeleton also includes two skeleton cover plates, and the skeleton cover plate is separately positioned on the outside of described two toroidal cores；The skeleton cover plate corner is chamfering；
Also include a secondary coil winding, the secondary coil winding is wound on the skeleton；The skeleton is installed, coil windings are connected on a printed circuit board, Hall element in the toroidal core air gap of the lower floor is directly connected with the printed circuit board, and the Hall element in the toroidal core air gap on the upper strata is connected by a conversion printed board with the printed circuit board.
In the turn ratio 1:3000T, when rated current is below 300AT, two size identical toroidal cores of single air gap, are installed up and down on skeleton and air gap divides equally coaxial double loop, and the toroidal core is made of nickeliferous more than 80% iron-nickel alloy.
Lamination is rushed with the cold punching piece riveting of different in width go out band magnetic core positioning hole and air gap locating dowel on the toroidal core.
There are the locating slot corresponding with magnetic core air gap locating dowel, positioning hole, locating dowel and the respectively component fixing hole of loop in loop up and down on the skeleton.
In the turn ratio 1:5000T, when rated current is more than 500AT, the toroidal core is formed with ultracrystallite tape wrapping.
The thickness of the ultracrystallite band is 0. 03-0. 05
The output voltage of the 2n Hall element asks the output voltage of n Hall element in arithmetic mean of instantaneous value or each loop first to ask arithmetic mean of instantaneous value to sum again.
The n is equal to 1 or 2
The spacing of the thickness of the toroidal core and two toroidal cores is more than or equal to 2 times of width of air gap and more than or equal to 1/4 semi-major axis in the toroidal core.
There are magnetic core air gap grid spacer and at least more than the three component fixed columns for dividing equally loop in loop up and down on the skeleton.
Be provided with the printed board with the component fix pin hole or fixed column matching size welding hole or
Fixing hole.
The toroidal core and corresponding skeleton are circular or square or abnormity.
Therefore, it is of the invention to be had the advantages that compared with present technology：
The invention provides a kind of magnetic core coil component of coaxial double loop structure.It is divided into two by the toroidal core of 2D height, become the toroidal core of two D height of processing, toroidal core is co-axially mounted above and below skeleton ensures the position of air gap, the uniformity of width and Hall element setting height(from bottom), improve the uniformity of core-theaded type closed-loop type Hall current sensor, reliability, simultaneously n air gap is provided with each toroidal core, n air gap or symmetrical or respectively each toroidal core, 2n air gap arranged in dislocation is 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 of instantaneous value or each loop first to ask arithmetic mean of instantaneous value to sum again, the influence of the remanent magnetism of magnetic core to the measurement accuracy of current sensor had both been eliminated in theory, the site error of original reason error one of core-theaded type closed-loop type Hall current sensor is eliminated again, greatly increase the current measurement precision of core-theaded type closed-loop type Hall current sensor；The cover plate with chamfering matches with skeleton on skeleton, makes component under the conditions of identical magnetic core size, line footpath, the number of turn, and coiling shortest path, Coil resistance is minimum, improves the linear measurement range and anti-saturation ability of closed-loop type Hall current sensor；The hole position of interconnection is provided between printed circuit board and skeleton, the uniformity and production efficiency of product is greatly improved, while also improving the reliability of product.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, does not constitute inappropriate limitation of the present invention, in the accompanying drawings：
Fig. 1 is the single gap structure schematic diagram of the present invention；
Fig. 2 is double air gaps structural representation of the present invention.
Embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, illustrative examples of the invention and explanation are used for explaining the present invention herein, but not as a limitation of the invention.Embodiment 1:
A kind of core-theaded type high precision closed loop type Hall current sensor of the present embodiment is with coaxial double loop magnetic core coil component, including two size identical toroidal cores and a skeleton, two toroidal cores are coaxially mounted to the upper and lower surface of skeleton, n air gap is provided with each toroidal core, n air gap or symmetrical or respectively each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop；N is equal to 1 in the present embodiment, as shown in figure 1, two toroidal cores are coaxially disposed, and air gap direction rotation 180.Install, a Hall element is provided with each air gap, because its core cross section size is small, lamination is rushed into the toroidal core with magnetic core positioning hole and air gap locating dowel with the cold punching piece riveting of different in width with nickeliferous more than 80% iron-nickel alloy, in order to the leakage field that reduces air gap influence and ensure good electromagnetic induction with coupling, the thickness of toroidal core is more than or equal to 2 times of width of air gap and is more than or equal to width of air gap of the spacing more than or equal to 2 times of magnetic core in 1/4 semi-major axis in toroidal core, double loop；The output voltage of 2 Hall elements seeks arithmetic mean of instantaneous value；Skeleton also includes two skeleton cover plates, skeleton cover plate is separately positioned on the outside of two toroidal cores, skeleton cover plate corner is chamfering, also include a secondary coil winding, secondary coil winding is wound on skeleton, is engaged with skeleton cover plate, makes secondary coil winding under the conditions of identical magnetic core size, line footpath, the number of turn, coiling shortest path, Coil resistance is minimum；There are the locating slot corresponding with magnetic core air gap locating dowel, magnetic core positioning hole, locating dowel and the respectively component fixing hole of loop in loop up and down on skeleton, there is the welding hole with the matching size of component fixing hole in printed board, fixed draw pin passes through the fixing hole on plastic skeleton, magnetic core coil component is installed on wiring board, the two ends of coil are directly welded on wiring board；Hall element in the toroidal core air gap of lower floor is directly connected with printed circuit board, Hall element in the toroidal core air gap on upper strata is connected by a conversion printed board with printed circuit board, a slot is additionally provided with the side of skeleton, conversion printed board is inserted in slot.
Embodiment 2:
The present embodiment and the difference of embodiment 1 be, in this implementation n=2, two magnetic core is coaxial and air gap direction is rotated by 90 ° installation, make an entirety into toroidal core blend compounds with the Surface ultracrystallites tape wrappings of 0. 03-0. 05；A Hall element is provided with each air gap, the output voltage of Hall element is that 2n Hall element asks arithmetic mean of instantaneous value or the Hall element of each magnetic core first to ask arithmetic mean of instantaneous value to sum again, as shown in Fig. 2, in order to the leakage field that reduces air gap influence and ensure good electromagnetic induction with coupling, the thickness of toroidal core is more than or equal to 2 times of width of air gap and more than or equal to 1/4 semi-major axis in toroidal core
The spacing of magnetic core is more than or equal to 2 times of width of air gap in double loop；Skeleton also includes two skeleton cover plates, skeleton cover plate is separately positioned on the outside of two toroidal cores, skeleton cover plate corner is chamfering, also include a secondary coil winding, secondary coil winding is wound on skeleton, is engaged with skeleton cover plate, makes secondary coil winding under the conditions of identical magnetic core size, line footpath, the number of turn, coiling shortest path, Coil resistance is minimum；There are magnetic core air gap grid spacer and at least more than the three component fixed columns for dividing equally loop in loop up and down on skeleton, skeleton is connected on a printed circuit board, there are the welding hole or fixing hole with the matching size of component fixed column in printed board, secured the assembly in after the completion of coil winding with self-tapping screw on wiring board；Hall element in the toroidal core air gap of lower floor is directly connected with printed circuit board, Hall element in the toroidal core air gap on upper strata is connected by a conversion printed board with printed circuit board, a slot is additionally provided with the side of skeleton, conversion printed board is inserted in slot.
The present invention also takes following technique measures：
(1) present invention is using the magnetic core coil component of coaxial double loop structure, and when loop magnetic core list air gap, toroidal core rushes lamination by nickeliferous more than 80% iron-nickel alloy band or cold punching piece riveting or winding is formed；When with even number air gap, toroidal core rushes lamination by nickeliferous 50% iron-nickel alloy band or cold punching piece riveting or winding is formed, and to improve the bandwidth of sensor, the thickness of iron-nickel alloy band is the Lan of 0. 03-0. 3.
(2) Effective permeability
It is μ for magnetic conductivity such as Fig. 1, width of air gap is g magnet ring, and L is the average length of magnetic path of magnet ring.Its Effective permeability is： μ
^ has -1+(μ -1) usually, μ 1000, and L g then have：
If divide equally the air gap of η same widths on magnet ring, have：
(3) basis（1) formula, in the ideal situation, refer to whether the sensitivity of the magnetic conductivity, the Open loop gain cofficient of amplifier, Hall element of soft magnetic materials used in magnetic core is very big, and actually above parameter is finite value, the particularly magnetic conductivity of soft magnetic materials, although（3) formula has 10%- 20% error, but remain to explanation, the magnetic core with air gap no matter its material magnetic conductivity it is how high, its Effective permeability is much lower, and the width of air gap is bigger, 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=l, 2.
It is co-axially mounted up and down on fixed mount for the toroidal core of D, n air gaps for height, such as figure one, figure two, in order to ensure the influence of magnetic induction intensity uniformity in air gap and the leakage field for reducing air gap, it is necessary to make D >=2g, d >=2g.To ensure good electromagnetic induction with coupling, it is necessary to make the b of height 1/4 of every loop magnetic core;In a=b=R (Round annulars）When, D^ l/4 R.
(3) arithmetic mean of instantaneous value is asked to eliminate original reason error-- site error
In figure one, figure two, because be tested electric current current－carrying conductor position in feedthrough hole it is different cause the of different sizes of magnetic induction density B in air gap, generate different Hall voltages, have：
VH=SIIICB …… （4)
SH, Ic are respectively sensitivity and the operating current of Hall element in air gap in formula
B is the magnetic induction intensity that tested electric current is produced in air gap
After this voltage is asked into arithmetic mean of instantaneous value through circuit, have：
The in figure one
Sii ' Β in formulaί 2Respectively it is tested magnetic induction intensity of the electric current in two air gaps, SH1 1,
SHThe sensitivity of Hall element and operating current in the-ι of i 2, respectively two air gaps.
From Hall effect principle, Hall voltage is to be changed accumulating for the positive and negative charge q that the direction of motion is produced on two-plate by external magnetic field by the carrier moved, this extremely similar to the plane-parallel capacitor after charging and the electric capacity C of plate condenser=£S/fl;The Hall element of two same packages has almost identical
Permittivity ε, polar plate area s and apart from a, the output voltage with same capacitance therefore two Hall elements asks arithmetic mean of instantaneous value by parallel plate capacitor parallel equivalent, has through circuit
C12Two tested electric current current－carrying conductors are when position is different in feedthrough hole, and the magnetic induction density B acted on Hall element is different and the quantity of electric charge q that producesu, q12Difference, has：
+ ^yc】）
=0· 5(νΗ11Ten vHl2)
=0.5 (Siil llcuB11 +SH12Icl2B12) …… （6)
By（5), (6) formula is understood, it is in parallel that multiple Hall voltages ask the processing method of arithmetic mean of instantaneous value to be equivalent to multiple Hall element output ends through circuit.
In figure two, similarly have：
1 two=0. 5 (Sy2I lC2 ι 2 i+SH22
...-(7) from（5), (6),（7) understand, multiple Hall voltages seek the processing method of arithmetic mean of instantaneous value through circuit, the original reason error position amount error of core-theaded type closed-loop Hall current sensor is eliminated in theory.The quantity of one Hall element of installation in each air gap, air gap and Hall element is more, asks after arithmetic mean of instantaneous value, positional error compensation is more thorough, the linearity, the precision of core-theaded type closed-loop Hall current sensor are better.But it is general using in every loop in practical application, even number air gap and Hall element, to offset influence of the remanent magnetism of magnetic core to current measurement precision, measurement accuracy is taken into account simultaneously and lower limit is differentiated in measurement, arithmetic mean of instantaneous value is asked using Hall element output end in same loop air gap, hall element output voltage summation process mode in air gap in different loops, makes measurement accuracy and differentiates lower limit optimization.
(4) span and lower limit of current measurement
In figure one, it is two size same cores that D, single width of air gap are g that we, which regard it the magnetic core that height is 2D as to be divided into height, two magnetic cores are coaxial and air gap direction rotates 180 ° of installations；In figure two, it regard height as to be 2D be divided into per a magnetic core of one air gap in side height be D, it is symmetrical
Double air gaps width is g two size same cores, two magnetic cores coaxially air gap direction rotations 90.Install.When the current－carrying conductor of endless is in feedthrough hole optional position, its coordinate is（X. y), for the magnetic circuit installed in lower floor, cutting down your law according to Biot's Sas can be proved, the π r of the magnetic induction intensity 8 in its air gap=4 1/2 are still set up, therefore we drop it into the same coordinate system to handle.
The output voltage of Hall element when the output voltage summation of Hall element during to single magnetic core double air gaps is with coaxial bimag list air gap asks arithmetic mean of instantaneous value to be compared, for the ease of comparing, it is assumed that Hall element sensitivity 5Η, operating current is identical（It can accomplish after actually being matched to Hall element stepping）, have：
Will（3) substitute into（8) formula
Now, noise voltage is Ve in the output voltage of Hall element, asks after arithmetic mean of instantaneous value and is: =2 Ve (10)
SHICN1 L
HI (― + (11)
4 g — )
11 r12=] the Hall element output that the output voltage of Hall element when ^ ... (12) contrasts four air gap of single magnetic core is summed with the coaxial Chinese magnetic core during per loop double air gaps is asked sums again after arithmetic mean of instantaneous value, has：
∑¾ -^^(- ^→- + -) ...... (13)
S"S r21 r22 r23 r24
Σ ^ ^^^ (Shang+Shang+Shang） ...... (15)
8ττ§ Γ21 Γ22 r23 r2
∑VH2 « ∑"¾ (17)
From the point of view of theory, coaxial many loop core structures are feasible, but in actual applications, not only to consider whether actual installation facilitates feasible, if can manufacture, and also need to consider manufacturing cost, typically using coaxial double loop core structure.
From（17), (18) formula is understood, under Hall element and air gap quantity the same terms compared with the output voltage summation process mode of Hall element, both ensured that the level of sensitivity of current sensor was identical, and offset voltage and temperature drift, output noise of Hall element etc. is declined 2 againVTimes, linearity, precision, temperature stability of core-theaded type closed-loop type Hall current sensor etc. is had big raising, current sensor measurement lower limit is reduced 2V' times；For the closed-loop type Hall current sensor that minimum rated current is 25A, the output noise voltage of Hall element be all how under part, 2 times of the minimum specified current reduction of this current sensor, now the minimum rated current of closed-loop type current sensor be25AT/
=8.84AT, realizes 10 Λ Τ electric current core-theaded type high-acruracy survey to be measured；Also this current sensor is made
Measurement span improves 2v times.
Beneficial effects of the present invention
1st, the present invention is to provide a kind of magnetic core coil component of coaxial double loop structure.It is divided into two by the toroidal core of 2D height, becomes to process the toroidal core of two D height, the weight and Hall element quantity of core material used are constant, will not increase considerably extra cost；Toroidal core is co-axially mounted the uniformity of the position for ensuring air gap, width and Hall element setting height(from bottom) above and below skeleton, improves uniformity, the reliability of core-theaded type closed-loop type Hall current sensor.Lamination is rushed into the toroidal core with magnetic core positioning hole and air gap locating dowel with the cold punching piece riveting of different in width with nickeliferous 80% iron-nickel alloy, the cover plate with chamfering matches therewith on skeleton, make component under the conditions of identical magnetic core size, line footpath, the number of turn, coiling shortest path, Coil resistance is minimum, improves the linear measurement range and anti-saturation ability of closed-loop shaped Hall current sensor.
2nd, 2 air gaps or symmetrical or respectively each toroidal core, eliminate the influence of the remanent magnetism of magnetic core to the measurement accuracy of current sensor；4 air gap arranged in dislocation are symmetrical or divide equally whole coaxial double loop, reduce site error of the current－carrying conductor in feedthrough hole.
3rd, the output voltage of 4 Hall elements seek arithmetic mean of instantaneous value through circuit or per loop in, the output voltage of 2 Hall elements first asks arithmetic mean of instantaneous value to sum again through circuit, theoretically eliminates the site error of original reason error one of Hall current sensor；From（17),（18) formula is understood, under Hall element and air gap quantity the same terms compared with the output voltage summation process mode of Hall element, both ensured that the level of sensitivity of current sensor was identical, offset voltage and temperature drift, output noise of Hall element etc. is set to decline 2v times again, linearity, precision, temperature stability of core-theaded type closed-loop type Hall current sensor etc. is had big raising, current sensor measurement lower limit is reduced 2v' times；For the closed-loop type Hall current sensor that minimum rated current is 25A, under conditions of the output noise voltage of Hall element is all ^, the minimum specified current reduction of this current sensor 2VTimes, now the minimum rated current of closed-loop type current sensor is25AT/ '=8. 84AT, realize that 10AT electric current core-theaded type to be measured is surveyed in high precision
Amount；Also the measurement span of this current sensor is made to improve 2. 828 times.Using coaxial many loop core structure and Hall element output summations with asking arithmetic mean of instantaneous value mode to be combined utilization, make 10AT electricity to be measured
Stream realizes core-theaded type high-acruracy survey.
4th, coaxial double loop causes the 0. 03-0. 05mm ultracrystallites tape wrapping that low cost may be selected in soft magnetic materials used in such a current sensor to make an entirety into toroidal core blend compounds per magnetic core double air gaps structure, double air gaps magnetic core is processed into, has been truly realized core-theaded type closed-loop type Hall current sensor good and cheap.
5th, another patent applied using inventor --- plant high precision closed loop type Hall current sensor electronic circuit and combined with coaxial double loop magnetic core coil component, core-theaded type closed-loop type Hall current sensor precision is set to reach 0. 1 % FS, its offset voltage temperature drift reaches 30 ppm/ °C ~ 100 ppm/ °C, and operation temperature area reaches -40 ~ 85.C, while also making current sensor measurement span bring up to nearly 60 times from nearly 20 times, -3db is with a width of 0-300KHzo
Therefore, the invention provides a kind of magnetic core coil component of coaxial double loop structure.It is divided into two by the toroidal core of 2D height, become the toroidal core of two D height of processing, toroidal core is co-axially mounted above and below skeleton ensures the position of air gap, the uniformity of width and Hall element setting height(from bottom), improve the uniformity of core-theaded type closed-loop type Hall current sensor, reliability, simultaneously n air gap is provided with each toroidal core, n air gap or symmetrical or respectively each toroidal core, 2n air gap arranged in dislocation is 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 of instantaneous value or each loop first to ask arithmetic mean of instantaneous value to sum again, the influence of the remanent magnetism of magnetic core to the measurement accuracy of current sensor had both been eliminated in theory, the site error of original reason error one of core-theaded type closed-loop type Hall current sensor is eliminated again, greatly increase the current measurement precision of core-theaded type closed-loop type Hall current sensor；The cover plate with chamfering matches with skeleton on skeleton, makes component under the conditions of identical magnetic core size, line footpath, the number of turn, and coiling shortest path, Coil resistance is minimum, improves the linear measurement range and anti-saturation ability of closed-loop shaped Hall current sensor；The hole position of interconnection is provided between printed circuit board and skeleton, the uniformity and production efficiency of product is greatly improved, while also improving the reliability of product.
The technical scheme provided above the embodiment of the present invention is described in detail, used herein
It is bright to be only applicable to help the principle for understanding the embodiment of the present invention；Simultaneously for those of ordinary skill in the art, according to the embodiment of the present invention, it will change in embodiment and application, in summary, this specification content should not be construed as limiting the invention.
Claims (8)
- Claims1st, a kind of core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil component, it is characterized in that, including two size identical toroidal cores and a skeleton, described two toroidal cores are coaxially mounted to the upper and lower surface of the skeleton, n air gap is provided with each toroidal core, the n air gap or symmetrical or respectively each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop；A Hall element is provided with each air gap；The output voltage of the 2n Hall element asks the output voltage of n Hall element in arithmetic mean of instantaneous value or each loop first to ask arithmetic mean of instantaneous value to sum again；The n is equal to 1 or 2;The skeleton also includes two skeleton cover plates, and the skeleton cover plate is separately positioned on the outside of described two toroidal cores；The skeleton cover plate corner is chamfering；Also include a secondary coil winding, the secondary coil winding is wound on the skeleton；The skeleton is installed, coil windings are connected on a printed circuit board, Hall element in the toroidal core air gap of the lower floor is directly connected with the printed circuit board, and the Hall element in the toroidal core air gap on the upper strata is connected by a conversion printed board with the printed circuit board；A slot is additionally provided with the side of the skeleton and is communicated with toroidal core air gap, conversion printed board is inserted in slot.2nd, 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 component, it is characterised in that in the turn ratio 1:When 3000T, rated current are below 300 Α Τ, two size identical toroidal cores of single air gap, are installed up and down on skeleton and air gap divides equally coaxial double loop, and the toroidal core is made of nickeliferous more than 80% iron-nickel alloy.3rd, 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 component, characterized in that, rushing lamination with the cold punching piece riveting of different in width on the toroidal core goes out band magnetic core positioning hole and air gap locating dowel.4th, 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 component, it is characterised in that in the turn ratio 1:5000 Τ, when rated current is more than 500 Α Τ, the toroidal core is formed with ultracrystallite tape wrapping, and the thickness of the ultracrystallite band isThe Hidden of 0. 03-0. 05..5th, 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 component, characterized in that, the spacing of the thickness of the toroidal core and two toroidal cores is more than or equal to 2 times of width of air gap and more than or equal to 1/4 semi-major axis in the toroidal core.6th, a kind of core-theaded type high precision closed loop type Hall current sensor described in any bar in claim 1,2,3 is with coaxial double loop magnetic core coil component, characterized in that, having the locating slot corresponding with magnetic core air gap locating dowel, positioning hole, locating dowel and the respectively component fixing hole of loop in loop up and down on the skeleton.7th, a kind of core-theaded type high precision closed loop type Hall current sensor described in any bar in claim 1,1,4 is with coaxial double loop magnetic core coil component, characterized in that, having magnetic core air gap grid spacer and at least more than the three component fixed columns for dividing equally loop in loop up and down on the skeleton.8th, a kind of core-theaded type high precision closed loop type Hall current sensor described in any bar in claim 1 is with coaxial double loop magnetic core coil component, characterized in that, being provided with the welding hole or fixing hole of the matching size with the component fixing hole or fixed column in the printed board.9th, 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 component, it is characterised in that the toroidal core and corresponding skeleton are circular or square or abnormity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
Applications Claiming Priority (4)
| 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 |
| CN2012200260414 | 2012-01-19 | ||
| 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 |
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104520721A true CN104520721A (en) | 2015-04-15 |
| CN104520721B CN104520721B (en) | 2017-05-17 |
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| 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 |
|---|---|---|---|
| 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 |
Country Status (2)
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| CN (2) | CN202661526U (en) |
| WO (1) | WO2013106958A1 (en) |
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| CN105548658A (en) * | 2015-12-31 | 2016-05-04 | 深圳青铜剑科技股份有限公司 | Closed-loop Hall current sensor |
| CN106526283A (en) * | 2016-11-03 | 2017-03-22 | 清华大学 | Multi-range current sensing device based on giant magnetoresistance effect |
| 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 |
| CN107422165A (en) * | 2017-06-09 | 2017-12-01 | 盐城工学院 | The closed-loop Hall current sensor that can be demagnetized online |
| CN108267621A (en) * | 2018-03-22 | 2018-07-10 | 广东电网有限责任公司清远供电局 | A kind of jaw type current measurer based on Hall element |
| CN108535527A (en) * | 2018-06-05 | 2018-09-14 | 南京普肯传感科技有限公司 | A kind of full PCB installing types closed-loop type Hall current sensor mounting structure |
| CN109683009A (en) * | 2019-01-17 | 2019-04-26 | 上海崇林汽车电子有限公司 | A kind of magnetic circuit device of large range high precision Hall current sensor |
| CN111983280A (en) * | 2019-10-10 | 2020-11-24 | 国网四川省电力公司电力科学研究院 | Magnetic field gathering assembly, non-contact leakage current measuring device and measuring method |
| CN112437882A (en) * | 2017-11-10 | 2021-03-02 | Abb瑞士股份有限公司 | Split core current sensor |
| CN113970663A (en) * | 2021-10-26 | 2022-01-25 | 中国电子科技集团公司第四十九研究所 | Magnetic core for closed-loop Hall current sensor |
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| CN105548658A (en) * | 2015-12-31 | 2016-05-04 | 深圳青铜剑科技股份有限公司 | Closed-loop Hall current sensor |
| CN106526283A (en) * | 2016-11-03 | 2017-03-22 | 清华大学 | Multi-range current sensing device based on giant magnetoresistance effect |
| 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 |
| CN106706990B (en) * | 2017-02-28 | 2023-07-25 | 南京普肯传感科技有限公司 | Magnetic core air gap fixing structure assembly for through-core type Hall current sensor |
| CN107422165A (en) * | 2017-06-09 | 2017-12-01 | 盐城工学院 | The closed-loop Hall current sensor that can be demagnetized online |
| CN107422165B (en) * | 2017-06-09 | 2023-11-03 | 盐城工学院 | Closed loop hall current sensor capable of on-line demagnetizing |
| CN112437882A (en) * | 2017-11-10 | 2021-03-02 | Abb瑞士股份有限公司 | Split core current sensor |
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| CN109683009A (en) * | 2019-01-17 | 2019-04-26 | 上海崇林汽车电子有限公司 | A kind of magnetic circuit device of large range high precision Hall current sensor |
| CN111983280A (en) * | 2019-10-10 | 2020-11-24 | 国网四川省电力公司电力科学研究院 | Magnetic field gathering assembly, non-contact leakage current measuring device and measuring method |
| CN111983280B (en) * | 2019-10-10 | 2023-03-03 | 国网四川省电力公司电力科学研究院 | Magnetic field gathering assembly, non-contact leakage current measuring device and measuring method |
| CN113970663A (en) * | 2021-10-26 | 2022-01-25 | 中国电子科技集团公司第四十九研究所 | Magnetic core for closed-loop Hall current sensor |
| WO2023077900A1 (en) * | 2021-11-04 | 2023-05-11 | 中国电力科学研究院有限公司 | Iron core-annular array multi-ring magnetosensitive current sensor and current measurement method |
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| CN117594340A (en) * | 2024-01-15 | 2024-02-23 | 江苏常荣电器股份有限公司 | Closed loop hall current sensor coil design structure |
| CN117594340B (en) * | 2024-01-15 | 2024-04-16 | 江苏常荣电器股份有限公司 | Closed loop hall current sensor coil design structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104520721B (en) | 2017-05-17 |
| WO2013106958A1 (en) | 2013-07-25 |
| CN202661526U (en) | 2013-01-09 |
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