CN104520721B - 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
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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
Technical field
The present invention relates to a kind of Hall current sensor magnetic core coil component, specifically a kind of core-theaded type high accuracy is closed
Ring-like Hall current sensor is with coaxial double loop magnetic core coil component.
Background technology
Non-cpntact measurement and monitoring method to electric current is a lot, and Hall current sensor is extensive because of its excellent cost performance
Using and form industrialization；Hall current sensor generally has open loop, two kinds of mode of operations of closed loop, closed-loop type Hall current sensing
Device 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, quilt
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 around
Group, appropriate power amplifier circuit composition.Its operation principle is：With secondary current ampere-turn in Hall element detection magnetic core air gap
Magnetic induction intensity produced by number NsIs offsets the degree of the magnetic induction intensity produced by primary current number of ampere turns NpIp, reaches dynamic
When state is balanced, in the ideal situation, have：
NpIp-NsIs=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.
Your law, magnetic induction density B and electric current around endless current－carrying conductor are cut down from Biot Sas in electromagnetism
Size I is directly proportional, and is inversely proportional with apart from r, i.e.,
Therefore when current－carrying conductor shift position in magnetic core of tested electric current, the magnetic induction produced in magnetic core air gap is strong
That spends is of different sizes, just generates site error, here it is single magnetic core, single air gap closed-loop type current sensor original reason error.
In addition, this magnetic structure there is problems：
1st, closed-loop type Hall current sensor typically rushes lamination using iron-nickel alloy band or cold punching piece riveting or winding is circularized
Magnetic core, 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, had been unfavorable for that sensor was small
Type, consumes more copper materials again, increases sensor cost.
2nd, without the remanent magnetism for fundamentally solving the problems, such as magnetic core, particularly many control systems are passed this structure in time
Sensor power supply lags behind monitored electric current, i.e., first have monitor current then to add sensor power power supply.In this case
The remanent magnetism problem of magnetic core is more prominent, 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 magnetic core remanent magnetism and site error
The influence big to current measurement precision, but air gap number increases, under the conditions of the same current number of turn, magnetic induction intensity in air gap
Reduce at double, the measurement lower limit and lowest resolution of sensor are deteriorated, so as to have impact on the current measurement span of sensor and lead to
The property used.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 0-150KHZ.
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, influence
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 be installed with pcb board and fixes, and greatly reduces sensor batch production uniformity, shadow
The reliability of production efficiency and sensor is rung.
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 more greatly, more accurately, more
Cost-effective core-theaded type high precision closed loop type Hall current sensor is with coaxial double loop magnetic core coil component.
Complete skill scheme of the invention is that a kind of core-theaded type high precision closed loop type Hall current sensor is used coaxial bicyclic
Road magnetic core coil component, including two size identical toroidal cores and a skeleton, two toroidal cores are coaxially pacified
Mounted in the upper and lower surface of the skeleton, n air gap, the n air gap or symmetrical are provided with each described toroidal core
Or divide equally each toroidal core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxially double loop；Described each gas
A Hall element is provided with gap；
The output voltage of the 2n Hall element seeks the n output electricity of Hall element in arithmetic mean of instantaneous value or each loop
Pressure first asks arithmetic mean of instantaneous value to sue for peace 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 outer of described two toroidal cores
Side；
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, the toroidal core gas that the skeleton lower floor installs
Hall element in gap is directly connected with the printed circuit board, the Hall in the toroidal core air gap that the skeleton upper strata is installed
Element 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 slotting
In groove；
In the turn ratio 1：When 3000T, rated current are below 300AT, two size identical toroidal cores of single air gap,
On skeleton up and down install and air gap divides equally coaxial double loop, 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 location hole and air gap locating dowel on the toroidal core.
In the turn ratio 1：When 5000T, rated current are more than 500AT, the toroidal core ultracrystallite tape wrapping is formed, institute
The thickness for stating ultracrystallite band is 0.03-0.05mm.
The toroidal core and corresponding skeleton are circular or square.
The width of air gap of the thickness of the toroidal core and two spacing of toroidal core more than or equal to 2 times and more than etc.
In 1/4 semi-major axis in the toroidal core, the semi-major axis is the diameter of circular magnetic core or the half of square core major axis.
There are the locating slot corresponding with magnetic core air gap locating dowel, location hole, locating dowel in upper and lower loop on the skeleton
And the respectively component fixing hole of loop.
There are magnetic core air gap grid spacer and at least more than three groups for dividing equally loop in upper and lower loop on the skeleton
Part fixed column.
The welding hole or fixing hole of the matching size with the component fixing hole or fixed column are provided with the printed board.
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 by one point of the toroidal core of 2D height
Two, become to process two toroidal cores of D height, toroidal core is co-axially mounted up and down in skeleton ensures position, the width of air gap
With the uniformity of Hall element setting height(from bottom), uniformity, the reliability of core-theaded type closed-loop type Hall current sensor are improve, together
When each toroidal core on be provided with n air gap, n air gap or symmetrical or divide equally each toroidal core, 2n air gap mistake
Position is installed or symmetrical or divide equally whole coaxial double loop, the output voltage of 2n Hall element ask arithmetic mean of instantaneous value or each
The n output voltage of Hall element first asks arithmetic mean of instantaneous value to sue for peace again in loop, and the remanent magnetism pair of magnetic core had both been eliminated in theory
The influence of the certainty of measurement of current sensor, eliminates the original reason error of core-theaded type closed-loop type Hall current sensor again ---
Site error, greatly increases the current measurement precision of core-theaded type closed-loop type Hall current sensor；Skeleton upper band chamfering
Cover plate and skeleton match, and make component under the conditions of identical magnetic core size, line footpath, the number of turn, coiling shortest path, and Coil resistance is most
It is small, improve the linear measurement range and anti-saturation ability of closed-loop type Hall current sensor；Between printed circuit board and skeleton
The hole position of interconnection is provided with, the uniformity and production efficiency of product is greatly improved, while also improving product
Reliability.
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, not
Inappropriate limitation of the present invention is constituted, in the accompanying drawings：
Fig. 1 is present invention list gap structure schematic diagram；
Fig. 2 is double air gaps structural representation of the present invention.
Specific embodiment
Describe the present invention in detail below in conjunction with accompanying drawing and specific embodiment, herein illustrative examples of the invention
It is and explanation is used for explaining the present invention 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 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,
It is provided with n air gap on each toroidal core, n air gap or symmetrical or divide equally each toroidal core, 2n air gap misplaces
Install 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 same
Axle is set, and air gap direction rotates 180 ° of installations, a Hall element is provided with each air gap, due to its core cross section chi
It is very little small, lamination is rushed with the cold punching piece riveting of different in width with nickeliferous more than 80% iron-nickel alloy and is determined into band magnetic core location hole and air gap
The toroidal core of position post, in order to reduce the influence of the leakage field of air gap and ensure good electromagnetic induction and couple, toroidal core
Thickness more than or equal to 2 times width of air gap and more than or equal to 1/4 semi-major axis in toroidal core, the spacing of magnetic core is big in double loop
In the width of air gap equal to 2 times；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 two outsides of toroidal core, and skeleton cover plate corner is chamfering, also including a secondary coil
Winding, secondary coil winding is wound on skeleton, is engaged with skeleton cover plate, make secondary coil winding identical magnetic core size,
Under the conditions of line footpath, the number of turn, coiling shortest path, Coil resistance is minimum；Have in upper and lower loop on skeleton and positioned with magnetic core air gap
The corresponding locating slot of post, magnetic core location hole, locating dowel and the respectively component fixing hole of loop, have in printed board and are fixed with component
Magnetic core coil component is installed to wiring board by the welding hole of the matching size in hole, fixed draw pin through the fixing hole on plastic skeleton
On, the two ends of coil are directly welded on wiring board；Hall element in the toroidal core air gap of lower floor is directly electric with printing
Road plate connection, the Hall element in the toroidal core air gap on upper strata is connected by a conversion printed board with printed circuit board, bone
A slot is additionally provided with the side of frame, conversion printed board is inserted in slot.
Embodiment 2：
The present embodiment is with the difference of embodiment 1, n=2 in this implementation, two magnetic cores are coaxial and air gap direction is revolved
Turn 90 ° of installations, form toroidal core blend compounds with 0.03-0.05mm ultracrystallite tape wrappings and make an entirety；Each gas
It is provided with a Hall element in gap, the output voltage of Hall element asks arithmetic mean of instantaneous value or each magnetic for 2n Hall element
The Hall element of core first asks arithmetic mean of instantaneous value to sue for peace again, as shown in Fig. 2 the influence of leakage field in order to reduce air gap and ensuring good
Good electromagnetic induction with couple, the thickness of toroidal core is more than or equal to 2 times of width of air gap and more than or equal in toroidal core 1/4
Semi-major axis, width of air gap of the spacing of magnetic core more than or equal to 2 times in double loop；Skeleton also includes two skeleton cover plates, skeleton lid
Plate is separately positioned on two outsides of toroidal core, and skeleton cover plate corner is chamfering, secondary also including a secondary coil winding
Level coil windings are wound on skeleton, are engaged with skeleton cover plate, make secondary coil winding in identical magnetic core size, line footpath, circle
Under said conditions, coiling shortest path, Coil resistance is minimum；There is magnetic core air gap grid spacer and at least in upper and lower loop on skeleton
There are more than the three component fixed columns for dividing equally loop, skeleton connection has and component fixed column on a printed circuit board, in printed board
Matching size welding hole or fixing hole, secured the assembly on wiring board with self-tapping screw after the completion of coil winding；Lower floor
Toroidal core air gap in Hall element be directly connected with printed circuit board, the Hall element in the toroidal core air gap on upper strata
It is connected with printed circuit board by a conversion printed 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 uses the magnetic core coil component of coaxial double loop structure, when loop magnetic core list air gap, toroidal core
Lamination is rushed by nickeliferous more than 80% iron-nickel alloy band or cold punching piece riveting or winding is formed；When with even number air gap, annular magnetic
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, iron nickel is closed
The thickness of gold ribbon is 0.03-0.3mm.
(2) Effective permeability
It is μ for magnetic conductivity such as Fig. 1, width of air gap is the magnet ring of g, and L is the average length of magnetic path of magnet ring.Its effective magnetic
Conductance is:
Usually, μ》1000, L》G, then have：
If divide equally the air gap of n same widths on magnet ring, have:
Refer to that the open loop of the magnetic conductivity, amplifier of soft magnetic materials used by magnetic core is amplified in the ideal situation according to (1) formula
Multiple, Hall element sensitivity it is whether very big, and actually above parameter is the magnetic of finite value, particularly soft magnetic materials
Conductance, although (3) formula has the error of 10%-20%, but explanation is remained to, no matter the magnetic conductivity of its material has many to the magnetic core with air gap
Height, its Effective permeability is much lower, and the width of air gap is bigger, and its Effective permeability is lower.Therefore, for closed-loop type Hall
The toroidal core of current sensor, its width of air gap or quantity are the smaller the better, usually n=1,2.
For height for the toroidal core of D, n air gap is co-axially mounted up and down on fixed mount, as shown in Figure 1, Figure 2, in order to true
Protect the influence of the leakage field of magnetic induction intensity uniformity and reduction air gap in air gap, it is necessary to make D≤2g, d≤2g.It is good to ensure
Electromagnetic induction with couple, it is necessary to make the height D≤1/4b of every loop magnetic core；At a=b=R (annular), D≤1/4R.
(3) arithmetic mean of instantaneous value is asked to eliminate original reason error --- site error
In Fig. 1, Fig. 2, magnetic induction is strong in causing air gap because being tested electric current current－carrying conductor position in feedthrough hole and being different
Degree B's is of different sizes, generates different Hall voltages, has：
VH=SHICB……(4)
S in formulaH、ICThe sensitivity of Hall element and operating current respectively in air gap
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:
In Fig. 1
VH1=0.5 (SH11IC11B11+SH12IC12B12)……(5)
B in formula11, B12Respectively it is tested magnetic induction intensity of the electric current in two air gaps, SH11, SH12, IC11, IC12Respectively
The sensitivity of Hall element and operating current in two air gaps.
From Hall effect principle, Hall voltage is to be changed the direction of motion by external magnetic field by the carrier for moving
The accumulation of the positive and negative charge q produced on two-plate, this extremely similar to the plane-parallel capacitor after charging and plate condenser
Electric capacity C=ε s/a；The Hall element of two same packages has an almost identical permittivity ε, polar plate area s and apart from a, tool
Therefore two output voltages of Hall element seek arithmetic mean of instantaneous value by parallel plate capacitor parallel connection etc. through circuit same capacitance
Effect, has
vH1=u=q/c=(q11+q12)/(c11+c12), c11=c12=c1。
Tested electric current current－carrying conductor is when position is different in feedthrough hole, acts on magnetic induction density B on Hall element not
The quantity of electric charge q for producing together11, q12Difference, has：
VH1=u=q/c=(q11+q12)/2c1=0.5 (q11/c1+q12/c1)
=0.5 (vH11+vH12)
=0.5 (SH11IC11B11+SH12IC12B12)……(6)
By (5), (6) formula understands, multiple Hall voltages ask the processing method of arithmetic mean of instantaneous value to be equivalent to multiple suddenly through circuit
Your cell output is in parallel.
In fig. 2, similarly have:
VH2=0.25 (SH21IC21B21+SH22IC22B22+SH23IC23B23+SH24IC24B24)
……(7)
From (5), (6), (7) understand that multiple Hall voltages seek the processing method of arithmetic mean of instantaneous value through circuit, disappear in theory
Except error is measured in the original reason error of core-theaded type closed-loop Hall current sensor --- --- position.One is installed in each air gap suddenly
The quantity of that element, air gap and Hall element is more, and after seeking arithmetic mean of instantaneous value, positional error compensation is more thorough, core-theaded type closed loop
The linearity of Hall current sensor, precision are better.But general using in per 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, while taking into account certainty of measurement and measurement resolution lower limit, uses
Hall element output end seeks arithmetic mean of instantaneous value in same loop air gap, hall element output voltage summation in air gap in different loops
Processing mode, makes certainty of measurement and differentiates lower limit optimization.
(4) span and lower limit of current measurement
In Fig. 1, it is regarded as height for a magnetic core of 2D is divided into height for D, single width of air gap are the two of g by we
Individual size same core, two magnetic cores coaxially 180 ° of installations of air gap direction rotation；In fig. 2, it is regarded as height for 2D is every
Air gap the magnetic core in one, side is divided into height for D, symmetric double width of air gap are two size same cores of g, two magnetic
Core is coaxial and air gap direction is rotated by 90 ° installation.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, your law is cut down according to Biot's Sas and be may certify that, the magnetic induction density B in its air gap=μ I/2 π
R still sets up, therefore we drop it into the same coordinate system to process.
The Hall unit that the output voltage of Hall element during to single magnetic core double air gaps is sued for peace during with coaxial bimag list air gap
The output voltage of part asks arithmetic mean of instantaneous value to be compared, for the ease of comparing, it is assumed that Hall element sensitivity SH, operating current IC
Identical (can accomplish after actually being matched to Hall element stepping), has:
(3) are substituted into (8) formula
Now, noise voltage is Ve in the output voltage of Hall element, is after seeking arithmetic mean of instantaneous value:
∑Ve1=2Ve......(10)
Contrast four air gap of single magnetic core when Hall element output voltage summation with coaxial bimag per loop double air gaps when
Hall element output seek arithmetic mean of instantaneous value after sue for peace again, have:
ΣVe2=4Ve......(14)
From the point of view of theory, coaxial many loop core structures are feasible, but in actual applications, not only to consider actual peace
Whether dress facilitates feasible, if can manufacture, and also needs to consider manufacturing cost, typically using coaxial double loop core structure.
From (17), (18) formula understands, the output voltage under Hall element and air gap quantity the same terms with Hall element
Summation process mode is compared, and has both ensured that the level of sensitivity of current sensor is identical, and the offset voltage and temperature of Hall element are made again
Drift, output noise etc. declineTimes, make the linearity, precision, the temperature stabilization of core-theaded type closed-loop type Hall current sensor
Property etc. has big raising, also reduces current sensor measurement lower limitTimes；It is 25A's for minimum rated current
Closed-loop type Hall current sensor, V is all in the output noise voltage of Hall elementeUnder conditions of, this current sensor is most
Small rated currents are reducedTimes, now the minimum rated current of closed-loop type current sensor is=
8.84AT, realizes the electric current core-theaded type high-acruracy survey to be measured of 10AT；Also improve the measurement span of this current sensorTimes.
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.By one point of the toroidal core of 2D height
It is two, becomes to process two toroidal cores of D height, the weight and Hall element quantity of core material used is constant, Bu Hui great
Amplitude increases extra cost；Toroidal core is co-axially mounted up and down in skeleton ensures that position, width and the Hall element of air gap are installed
The uniformity of height, improves uniformity, the reliability of core-theaded type closed-loop type Hall current sensor.With nickeliferous 80% iron nickel
Alloy rushes lamination into the toroidal core with magnetic core location hole and air gap locating dowel with the cold punching piece riveting of different in width, and skeleton upper band is fallen
The cover plate at angle matches therewith, makes component under the conditions of identical magnetic core size, line footpath, the number of turn, coiling shortest path, Coil resistance
Minimum, improves the linear measurement range and anti-saturation ability of closed-loop shaped Hall current sensor.
2nd, 2 air gaps or symmetrical or divide equally each toroidal core, eliminate the survey of the remanent magnetism to current sensor of magnetic core
The influence of accuracy of measurement；4 air gap arranged in dislocation are symmetrical or divide equally whole coaxial double loop, reduce current－carrying conductor and wearing
Site error in core bore.
3rd, the output voltage of 4 Hall elements or through circuit seek arithmetic mean of instantaneous value or per loop in, 2 Hall elements it is defeated
Go out voltage first asks arithmetic mean of instantaneous value to sue for peace again through circuit, theoretically eliminates the original reason error-position of Hall current sensor
Put error；From (17), (18) formula understands, is asked with the output voltage of Hall element under Hall element and air gap quantity the same terms
Compared with processing mode, both ensured that the level of sensitivity of current sensor is identical, make again Hall element offset voltage and temperature drift,
Output noise etc. declinesTimes, make the linearity, precision, temperature stability of core-theaded type closed-loop type Hall current sensor etc.
There is big raising, also reduce current sensor measurement lower limitTimes；It is the closed-loop type of 25A for minimum rated current
Hall current sensor, V is all in the output noise voltage of Hall elementeUnder conditions of, this current sensor it is minimum specified
Current reductionTimes, now the minimum rated current of closed-loop type current sensor isRealize
The electric current core-theaded type high-acruracy survey to be measured of 10AT；Also the measurement span of this current sensor is made to improve 2.828 times.Utilize
Coaxial many loop core structures and Hall element output summation make that 10AT's is to be measured with asking arithmetic mean of instantaneous value mode to be combined utilization
Electric current realizes core-theaded type high-acruracy survey.
4th, coaxial double loop causes that soft magnetic materials used by this kind of current sensor may be selected cost per magnetic core double air gaps structure
Low 0.03-0.05mm ultracrystallite tape wrappings form toroidal core blend compounds and make an entirety, are processed into double air gaps magnetic
Core, has been truly realized core-theaded type closed-loop type Hall current sensor good and cheap.
5th, another patent-a kind of high precision closed loop type Hall current sensor electronic circuit applied using inventor
Combined with coaxial double loop magnetic core coil component, core-theaded type closed-loop type Hall current sensor precision is reached 0.1%FS, its mistake
Voltage temperature drift is adjusted to reach 30ppm/ DEG C~100ppm/ DEG C, operation temperature area reaches -40~85 DEG C, while also surveying current sensor
Amount span brings up to nearly 60 times from nearly 20 times, and -3db is with a width of 0-300KHz.
Therefore, the invention provides a kind of magnetic core coil component of coaxial double loop structure.By the annular of 2D height
Magnetic core is divided into two, and becomes to process two toroidal cores of D height, and toroidal core is co-axially mounted up and down in skeleton ensures air gap
The uniformity of position, width and Hall element setting height(from bottom), improve core-theaded type closed-loop type Hall current sensor uniformity,
Reliability, while be provided with n air gap on each toroidal core, n air gap or symmetrical or divide equally each toroidal core, 2n
Individual air gap arranged in dislocation is symmetrical or divide equally whole coaxial double loop, and the output voltage of 2n Hall element seeks arithmetic average
The n output voltage of Hall element first asks arithmetic mean of instantaneous value to sue for peace again in value or each loop, and magnetic core is both eliminated in theory
Influence of the remanent magnetism to the certainty of measurement of current sensor, the principle of core-theaded type closed-loop type Hall current sensor is eliminated again
Error --- site error, greatly increases the current measurement precision of core-theaded type closed-loop type Hall current sensor；Skeleton upper band
The cover plate of chamfering matches with skeleton, makes component under the conditions of identical magnetic core size, line footpath, the number of turn, coiling shortest path, coil
Internal resistance is minimum, improves the linear measurement range and anti-saturation ability of closed-loop shaped Hall current sensor；Printed circuit board and bone
The hole position of interconnection is provided between frame, the uniformity and production efficiency of product is greatly improved, while also improving
The reliability of product.
The technical scheme for being provided the embodiment of the present invention above is described in detail, specific case used herein
Principle and implementation method to the embodiment of the present invention are set forth, and the explanation of above example is only applicable to help and understands this
The principle of inventive embodiments；Simultaneously for those of ordinary skill in the art, according to the embodiment of the present invention, in specific embodiment party
Be will change in formula and range of application, in sum, this specification content should not be construed as limiting the invention.
Claims (8)
1. with coaxial double loop magnetic core coil component, its feature exists a kind of core-theaded type high precision closed loop type Hall current sensor
In including two size identical toroidal cores and a skeleton, two toroidal cores are coaxially mounted to the skeleton
Upper and lower surface, be provided with n air gap on each described toroidal core, the n air gap or symmetrical or divide equally each ring
Shape magnetic core, 2n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop；It is provided with described each air gap
One Hall element；
The output voltage of the 2n Hall element asks the n output voltage elder generation of Hall element in arithmetic mean of instantaneous value or each loop
Arithmetic mean of instantaneous value is asked to sue for peace 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, in the toroidal core air gap that the skeleton lower floor installs
Hall element be directly connected with the printed circuit board, the Hall element in the toroidal core air gap that the skeleton upper strata is installed
It is connected with the printed circuit board by a conversion printed 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
It is interior；
In the turn ratio 1：When 3000T, rated current are below 300AT, two size identical toroidal cores of single air gap, in skeleton
On up and down install and air gap divides equally coaxial double loop, the toroidal core is made of nickeliferous more than 80% iron-nickel alloy.
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 block, it is characterised in that on the toroidal core with the cold punching piece riveting of different in width rush lamination go out band magnetic core location hole and
Air gap locating dowel.
3. 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 block, it is characterised in that in the turn ratio 1：When 5000T, rated current are more than 500AT, the toroidal core ultracrystallite
Tape wrapping is formed, and the thickness of the ultracrystallite band is 0.03-0.05mm.
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 block, it is characterised in that the toroidal core and corresponding skeleton are circular or square.
5. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 4 is with coaxial double loop magnetic core
Coil block, it is characterised in that the air gap of the thickness of the toroidal core and two spacing of toroidal core more than or equal to 2 times
Width and more than or equal to 1/4 semi-major axis in the toroidal core, the semi-major axis is that the diameter or square core of circular magnetic core are long
The half of axle.
6. a kind of core-theaded type high precision closed loop type Hall current sensor described in any bar in claim 1,2 is with together
Axle double loop magnetic core coil component, it is characterised in that have and magnetic core air gap locating dowel, positioning in upper and lower loop on the skeleton
The corresponding locating slot in hole, locating dowel and the respectively component fixing hole of loop.
7. a kind of core-theaded type high precision closed loop type Hall current sensor described in any bar in claim 1,3 is with together
Axle double loop magnetic core coil component, it is characterised in that have magnetic core air gap grid spacer and extremely in upper and lower loop on the skeleton
Rare more than the three component fixed columns for dividing equally loop.
8. a kind of core-theaded type high precision closed loop type Hall current sensor according to claim 7 is with coaxial double loop magnetic core
Coil block, it is characterised in that the weldering of the matching size with the component fixing hole or fixed column is provided with the printed board
Hole or fixing hole.
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 |
|---|---|---|---|
| CN2012200260414 | 2012-01-19 | ||
| 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104520721A CN104520721A (en) | 2015-04-15 |
| CN104520721B true 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 |
Family Applications Before (1)
| 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)
| Country | Link |
|---|---|
| CN (2) | CN202661526U (en) |
| WO (1) | WO2013106958A1 (en) |
Families Citing this family (17)
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| US9285437B2 (en) * | 2013-10-02 | 2016-03-15 | Rockwell Automation Technologies, Inc. | Hall effect sensor core with multiple air gaps |
| US9541581B2 (en) * | 2014-10-27 | 2017-01-10 | Fluke Corporation | Flexible current sensor |
| CN104931756B (en) * | 2015-05-25 | 2017-10-13 | 山东航天电子技术研究所 | It is a kind of to be applied to the square current sensor skeleton to plugging in magnetic core |
| CN105548658B (en) * | 2015-12-31 | 2019-04-23 | 深圳青铜剑科技股份有限公司 | A kind of 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 |
| 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 |
| CN107422165B (en) * | 2017-06-09 | 2023-11-03 | 盐城工学院 | Closed loop hall current sensor capable of on-line demagnetizing |
| US11073539B2 (en) * | 2017-11-10 | 2021-07-27 | Abb Schweiz Ag | Split core current sensor |
| CN108169539A (en) * | 2018-03-22 | 2018-06-15 | 广东电网有限责任公司清远供电局 | A kind of tong-type ammeter based on Hall effect |
| CN108535527B (en) * | 2018-06-05 | 2023-12-05 | 南京普肯传感科技有限公司 | Full PCB installation type closed loop Hall current sensor installation structure |
| CN108562774B (en) * | 2018-06-21 | 2021-05-07 | 山东航天电子技术研究所 | Small-size metal casing collection magnetism formula hall current sensor |
| 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 |
| CN110672902A (en) * | 2019-10-10 | 2020-01-10 | 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 |
| CN114113738A (en) * | 2022-01-25 | 2022-03-01 | 南京普肯传感科技有限公司 | Magnetic circuit for core-through closed-loop Hall current sensor and mounting 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 |
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| US5923162A (en) * | 1997-04-18 | 1999-07-13 | Bell Technologies Inc. | Non-inductive lead path hall effect electrical current sensor |
| CN2689237Y (en) * | 2004-04-28 | 2005-03-30 | 邹高芝 | Coil and magnetic core assembly of current sensor without magnetic core protective cover |
| WO2006113459A2 (en) * | 2005-04-13 | 2006-10-26 | Crane Co. | Current sensor |
| CN101271130A (en) * | 2008-01-24 | 2008-09-24 | 武汉格蓝若光电互感器有限公司 | Lattice type Hall electric current transducer |
| CN201277993Y (en) * | 2008-08-21 | 2009-07-22 | 天津市松正电动科技有限公司 | Magnetic induction current sensor for electric vehicle controller |
-
2012
- 2012-01-19 CN CN2012200260414U patent/CN202661526U/en not_active Expired - Lifetime
- 2012-02-09 WO PCT/CN2012/000154 patent/WO2013106958A1/en active Application Filing
- 2012-02-09 CN CN201280056650.7A patent/CN104520721B/en active Active
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| Publication number | Publication date |
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| CN104520721A (en) | 2015-04-15 |
| WO2013106958A1 (en) | 2013-07-25 |
| CN202661526U (en) | 2013-01-09 |
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