CN202661525U - Coaxial double-loop magnetic core structure assembly for core-through type high precision opened-loop type Hall current sensor - Google Patents

Abstract

The utility model belongs to the magnetic core structure field for a Hall current sensor and discloses a coaxial double-loop magnetic core structure assembly for a core-through type high precision opened-loop type Hall current sensor. The coaxial double-loop magnetic core structure assembly for the core-through type high precision opened-loop type Hall current sensor comprises two annular magnetic cores with identical dimensions and a fixed frame, wherein the two annular magnetic cores are coaxially mounted at upper and lower surfaces of the fixed frame, each annular magnetic core is provided with 2n air gaps, the 2n air gaps are in symmetrical or uniform distribution at the annular magnetic core, and the 4n air gaps are in staggered, or symmetrical or uniform distribution at the whole coaxial double-loop. Arithmetic average of output voltage of 4n Hall elements is calculated, or arithmetic average of output voltage of the 2n Hall elements in each loop is calculated and then summation is carried out. The coaxial double-loop magnetic core structure assembly is mounted on a printed circuit board, and 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 structure assembly has advantages of larger measuring scope, more precise effect and less cost.

Description

Core-theaded type High Precision Open-loop type Hall current sensor is with coaxial double loop core structure assembly

Technical field

The present invention relates to a kind of Hall current sensor core structure assembly, is a kind of core-theaded type High Precision Open-loop type Hall current sensor with coaxial double loop core structure 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 open ring type Hall current sensor is a kind of novel current sensor, have the characteristics such as highly sensitive, low in energy consumption, that electricity is isolated, cost performance is 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 open ring type Hall current sensor is made with the toroidal core of air gap and suitable amplifier circuit by Hall element, soft magnetic material and is formed.Its course of work is: with the magnetic induction density that Hall element detection of primary electric current produces in magnetic core air gap, the output voltage of Hall element is amplified to 0-4V or 0-5V output through the amplifier adjustment.Because its course of work of this current sensor is open loop structure, so be called the open ring 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

$B=\frac{\mathrm{\μI}}{2\mathrm{\πr}}\·\·\·\·\·\·\left(1\right)$

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, the original reason error of the open-loop current sensor of Here it is single magnetic core, single gap structure.In addition, also there is following problem in this magnetic structure:

1, the Hall open-loop current sensor of single magnetic circuit, single gap structure is because the magnetic core remanence ratic is larger, and sensor zero point changes greatly, has a strong impact on the measuring accuracy of sensor.In order to reduce the surplus impact of magnetic, adopt the surplus iron-nickel alloy material of low magnetic to make magnetic core, will significantly improve the manufacturing cost of sensor.

2, 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, in order to reach identical sensor output amplitude, must the be multiplied enlargement factor of amplifier, and the enlargement factor of amplifier can not unrestrictedly increase; Hall element output summation is also sued for peace its output noise, also is multiplied, and adding amplifier magnification ratio increases, and causes that the sensor output noise is multiplied, and makes the output of sensor unstable.Therefore, the increase of air gap number and enlargement factor will cause sensor under the condition of identical punching aperture in the magnetic core, measurement lower limit and lowest resolution variation, thus affected current measurement precision and the versatility of sensor.

3, the structure of single magnetic core, a plurality of air gaps, it is very difficult that magnetic core is installed, be positioned at piecemeal magnet ring in the plastic casing first, be difficult for guaranteeing the width of air gap consistance, and the position of a plurality of Hall elements in air gap also can't be installed unanimously, cause sensor batch production consistance poor, must adjust one by one electrical quantity, greatly affect 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 Open-loop type Hall current sensor is with coaxial double loop core structure assembly.

Complete skill scheme of the present invention is, a kind of core-theaded type High Precision Open-loop type Hall current sensor is with coaxial double loop core structure assembly, comprise two measure-alike toroidal cores and a fixed mount, the coaxial upper and lower surface that is installed in described fixed mount of described two toroidal cores, be provided with 2n air gap on described each toroidal core, a described 2n air gap or symmetrical or divide equally each toroidal core, 4n 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 assembly is installed on the printed circuit board, Hall element in the toroidal core air gap of described assembly lower floor directly is connected with described printed circuit board, and the Hall element in the toroidal core air gap on described assembly 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 fixed mount and communicate with the toroidal core air gap, the conversion printed board is inserted in the slot.

Toroidal core rushes lamination by the riveting of iron-nickel alloy cold punching sheet and forms; Or reeled by the oriented silicon steel disc of high-quality and to form.

Magnetic core pilot hole or locating slot are set on the described toroidal core.

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.

Be provided with fixed orifice on the described fixed mount, also be provided with fixed orifice in the described printed board, fixedly draw toroidal core, the fixed orifice on the fixed mount that pin passes with pilot hole and link to each other with the printed board of current sensor circuit.

Described toroidal core and corresponding fixed mount are circular square or special-shaped.

Therefore the present invention has compared following beneficial effect with present technology:

The invention provides a kind of core structure 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 fixed mount, the consistance of width and Hall element setting height(from bottom), improved the consistance of core-theaded type open ring type Hall current sensor, reliability, be provided with 2n air gap on each toroidal core simultaneously, 2n air gap or symmetrical or divide equally each toroidal core, 4n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop, the output voltage of 4n Hall element asks the output voltage of 2n 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 open ring type Hall current sensor, improved widely the current measurement precision of core-theaded type open ring type Hall current sensor; Be provided with position, interconnective hole between printed circuit board and the fixed mount, 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;

Fig. 3 is square core structural representation of the present invention;

Fig. 4 is the circular core 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 Open-loop of present embodiment type Hall current sensor is with coaxial double loop core structure assembly, comprise two measure-alike toroidal cores and a fixed mount, the fixed mount side of being annular, two coaxial upper and lower surfaces that are installed in fixed mount of square toroidal core, on side's toroidal core the magnetic core pilot hole is set, be provided with 2n air gap on each toroidal core, 2n air gap or symmetrical or divide equally each toroidal core, 4n 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 2, two coaxial settings of toroidal core, and the air gap direction half-twist is installed, be provided with a Hall element in each air gap, toroidal core rushes lamination by nickeliferous 50% iron-nickel alloy cold punching sheet riveting and forms, and for the impact of the leakage field that reduces air gap, the spacing of the thickness of toroidal core and two toroidal cores is more than or equal to 2 times width of air gap; The output voltage of 4n Hall element asks the output voltage of arithmetic mean or each magnetic core 2n Hall element to ask arithmetic mean to sue for peace again; Fixed mount is connected on the printed circuit board, also is provided with fixed orifice in the printed board, fixedly draws toroidal core, the fixed orifice on the fixed mount that pin passes with pilot hole and links to each other with the printed board of current sense circuit; The toroidal core of lower floor directly is connected with printed circuit board, and the toroidal core on upper strata is connected with printed circuit board by a conversion printed board, also is provided with a slot on the side of fixed mount, and the conversion printed board is inserted in the slot.

Embodiment 2:

The difference of present embodiment and embodiment 1 is, fixed mount is annular in this enforcement, comprise two measure-alike toroidal cores and a fixed mount, two coaxial upper and lower surfaces that are installed in fixed mount of toroidal core, the magnetic core pilot hole is set on the toroidal core, be provided with 2n air gap on each toroidal core, 2n air gap or symmetrical or divide equally each toroidal core, 4n 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 2, two coaxial settings of toroidal core, and the air gap direction half-twist is installed, be provided with a Hall element in each air gap, toroidal core rushes lamination by nickeliferous 50% iron-nickel alloy cold punching sheet riveting and forms, and for the impact of the leakage field that reduces air gap, the spacing of the thickness of toroidal core and two toroidal cores is more than or equal to 2 times width of air gap; The output voltage of 4n Hall element asks the output voltage of arithmetic mean or each magnetic core 2n Hall element to ask arithmetic mean to sue for peace again, fixed mount is connected on the printed circuit board, also be provided with fixed orifice in the printed board, fixedly draw toroidal core, the fixed orifice on the fixed mount that pin passes with fixed orifice and link to each other with the printed board of current sense circuit; 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 fixed mount, the conversion printed board is inserted in the slot.

The present invention also takes following technique measures:

(1) the present invention adopts coaxial double loop core structure assembly, when loop magnetic core list air gap, and toroidal core or rush lamination or reeled by the oriented silicon steel disc of high-quality by nickeliferous iron-nickel alloy cold punching sheet riveting more than 80% and form; When with 2n air gap, toroidal core rushes lamination by nickeliferous 50% iron-nickel alloy cold punching sheet riveting and forms; Or reeled by the oriented silicon steel disc of high-quality and to form, but must the processing locating slot, in order to be in place, guarantee the air gap consistance.

(2) total width of air gap

Such as figure three, 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 magnetic circuit theorem, with the mmf ε of the closed magnetic circuit of air gap _mEqualing magnetic potential landing sum on each section magnetic circuit. total magnetic resistance of series circuit equals each magnetic resistance sum, namely

ε _m=NI=ФΣR _m ……(5)

ΣR _m=R _i+R _g ……(6)

NI------electric current ampere turns in the formula

Ф-----magnetic flux

Ri, R _g----respectively is the magnetic resistance of magnetic circuit middle magnetic ring part and n air gap part.

Ri=(L-ng)/μA ……(7)

Rg=ng/μA ……(8)

μ in the formula ... the magnetic permeability of the used soft magnetic material of .. magnetic circuit

μ ₀.... air permeability

A..... the sectional area of magnetic circuit

If the magnetic induction density of magnetic circuit is B, then:

Ф=BA ……(9)

With (6), (9) formula substitution (5) formula gets:

ε _m=NI=BA（R _i+R _g） ……(10)

With (7), (8) formula substitution (10) formula then has:

NI=B{(L-ng)(1/μ)+ng(1/μ ₀)} ……(11)

When NI is the upper limit of tested electric current ampere turns, be the current sensor set-point of the given punching size of design, calculate the overall width of air gap according to (11) formula.B is the numerical value that checks in from used soft magnetic material parametric line, for the nonlinearity erron that guarantees current sensor is little, should be selected in the unsaturation section of soft magnetic material BH curve, and allow some leeway.The optional B of oriented silicon steel disc with high-quality is 0.8T, and the nickeliferous optional B of nickel alloy sheet more than 50% is 0.6T.Correlation parameter substitution (11) formula can be obtained total width of air gap ng.

Toroidal core up and down coaxial installation on fixed mount for highly being D, a 2n air gap such as Fig. 1, Fig. 2, 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.

(3) ask arithmetic mean to eliminate original reason error---site error

At Fig. 1, among Fig. 2, 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,

V _H=S _HI _CB ……(12)

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

The output voltage of Hall element after circuit is asked arithmetic mean, is had:

In figure one

V _H1=0.5(S _H11I _C11B ₁₁+S _H12I _C12B ₁₂) ……(13)

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, 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 the equivalence in parallel of the capacitance of plane-parallel capacitor 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) ……(14)

By (13), (14) 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 Fig. 2, in like manner have:

V _H2=0.25(S _H21I _C21B ₂₁+S _H22I _C22B ₂₂+S _H23I _C23B ₂₃+S _H24I _C24B ₂₄)

……(15)

By (13), (14), (15) formula as can be known, the output voltage of a plurality of Hall elements asks the disposal route of arithmetic mean to be equivalent to the output terminal parallel connection of a plurality of Hall elements through circuit; The output voltage of current sensor is the arithmetic mean of output voltage that amplifies the Hall element of several times, has eliminated in theory original reason error------the position amount error of core-theaded type open 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 open loop Hall current sensor are better.But general the employing in every loop in the practical application, 2n 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 Fig. 1, we regard as it highly for 2D, width of air gap are that the magnetic core of g is divided into highly is that D, 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 Fig. 2, it is regarded as highly for the magnetic core 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 axis of symmetry differs 90 ° of installations.When the current－carrying conductor of endless in the feedthrough hole optional position, its coordinate is (x.y), for the magnetic core 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.

At this, the output voltage of Hall element asked arithmetic mean to compare when we sued for peace the output voltage of the Hall element in the two air gaps of single magnetic core with coaxial bimag list air gap, for the ease of relatively, supposed the sensitivity S of two Hall elements _H, working current I _CIdentical (in fact to accomplishing after the pairing of Hall element stepping) has:

With (4) substitution (16) formula, have:

$\mathrm{\Σ}{V}_{H1}\≈\frac{S_H{I}_C\mathrm{NIL}}{4\mathrm{\πg}}(\frac{1}{r_{11}}+\frac{1}{r_{12}})\·\·\·\·\·\·\left(17\right)$

At this moment, the noise voltage Ve sum of Hall element output is:

ΣV _e1=2V _e ……(18)

$\stackrel{\‾}{V_{H1}}\≈\frac{S_H{I}_C\mathrm{NIL}}{4\mathrm{\πg}}(\frac{1}{r_{11}}+\frac{1}{r_{12}})\·\·\·\·\·\·\left(19\right)$

$\stackrel{\‾}{V_{e1}}=\sqrt{\frac{1}{2}}{V}_e\·\·\·\·\·\·\left(20\right)$

The output voltage of Hall element was asked arithmetic mean when the output voltage summation of Hall element was with the two air gap of the every loop of coaxial bimag in contrast single magnetic core four air gaps, had:

$\mathrm{\Σ}{V}_{H2}\≈\frac{S_H{I}_C\mathrm{NIL}}{8\mathrm{\πg}}(\frac{1}{r_{21}}+\frac{1}{r_{22}}+\frac{1}{r_{23}}+\frac{1}{r_{24}})\·\·\·\·\·\·\left(21\right)$

ΣV _e2=4V _e ……(22)

$\stackrel{\‾}{V_{H2}}\≈\frac{S_H{I}_C\mathrm{NIL}}{16\mathrm{\πg}}(\frac{1}{r_{21}}+\frac{1}{r_{22}}+\frac{1}{r_{23}}+\frac{1}{r_{24}})\·\·\·\·\·\·\left(23\right)$

$\stackrel{\‾}{V_{e2}}=\sqrt{\frac{1}{4}}{V}_e=\frac{1}{2}{V}_e\·\·\·\·\·\·\left(24\right)$

The output voltage summation and a coaxial n magnetic core of Hall element in 2n air gap of contrast single magnetic core, the output voltage of Hall element is asked arithmetic mean during the two air gap of every loop, has:

$\mathrm{\Σ}{V}_{H2n}\≈\frac{S_H{I}_C\mathrm{NIL}}{2n\×2\mathrm{\πg}}(\frac{1}{r_{n1}}+\frac{1}{r_{n2}}+\·\·\·+\frac{1}{r_{n2n}})\·\·\·\·\·\·\left(25\right)$

ΣV _e2n=2nV _e ……(26)

$\stackrel{\‾}{V_{H2n}}\≈\frac{S_H{I}_C\mathrm{NIL}}{4n\×2\mathrm{\πg}}(\frac{1}{r_{n1}}+\frac{1}{r_{n2}}+\·\·\·+\frac{1}{r_{n2n}})\·\·\·\·\·\·\left(27\right)$

$\stackrel{\‾}{V_{e2n}}=\sqrt{\frac{1}{2n}}{V}_e\·\·\·\·\·\·\left(28\right)$

$\mathrm{\Σ}{V}_{H2n}\≈2\stackrel{\‾}{V_{H2n}}\·\·\·\·\·\·\left(29\right)$

$\mathrm{\Σ}{V}_{e2n}=2n\sqrt{2n}\stackrel{\‾}{V_{e2n}}\·\·\·\·\·\·\left(30\right)$

From theory, coaxial many loops core structure is feasible, but in actual applications, will consider not only whether actual installation is convenient, whether can manufacture, and also need consider manufacturing cost, generally adopts coaxial double loop core structure.

Contrast 4n air gap of single magnetic core and Hall element, output voltage summation and the every loop 2n air gap of coaxial double loop and the Hall element of Hall element, the output voltage of Hall element is sued for peace after asking separately first arithmetic mean again in the loop air gap up and down, has:

$\mathrm{\Σ}{V}_{H4n}\≈\frac{S_H{I}_C\mathrm{NIL}}{4n\×2\mathrm{\πg}}(\frac{1}{r_{n1}}+\frac{1}{r_{n2}}+\·\·\·+\frac{1}{r_{n4n}})\·\·\·\·\·\·\left(31\right)$

ΣV _e4n=4nV _e ……(32)

$\mathrm{\Σ}\stackrel{\‾}{V_{2n}}\≈\frac{S_H{I}_C\mathrm{NIL}}{4n^2\×2\mathrm{\πg}}(\frac{1}{r_{n1}}+\frac{1}{r_{n2}}+\·\·\·+\frac{1}{r_{n4n}})\·\·\·\·\·\·\left(33\right)$

$\mathrm{\Σ}\stackrel{\‾}{V_{e4n}}=2\sqrt{\frac{1}{2n}}{V}_e\·\·\·\·\·\·\left(34\right)$

$\mathrm{\Σ}{V}_{H4n}=\mathrm{n\Σ}\stackrel{\‾}{V_{2n}}\·\·\·\·\·\·\left(35\right)$

$\mathrm{\Σ}{V}_{e4n}=2n\sqrt{2n}\mathrm{\Σ}\stackrel{\‾}{V_{e4n}}\·\·\·\·\·\·\left(36\right)$

From (35), (36) formula is the current sensor of 25A for minimum rated current as can be known, is all V at Hall element output noise voltage _eCondition under, the minimum specified current reduction of this current sensor

Doubly, when getting n=1, be the two gap structures of the every loop of coaxial double loop, this moment, the minimum rated current of current sensor was

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 (precision can reach 0.2%FS) to be measured of 10A; Simultaneously also make the current sensor measurement span bring up to nearly 60 times from nearly 20 times.

Beneficial effect of the present invention

1, the present invention provides a kind of coaxial double loop core structure assembly.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 the plastics fixed mount, has improved consistance, the reliability of core-theaded type open ring type Hall current sensor.

2,2n air gap or symmetrical or divide equally each toroidal core eliminated the remanent magnetism of magnetic core to the impact of the measuring accuracy of current sensor; 4n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop reduced the site error of current－carrying conductor in feedthrough hole.

3, the output voltage of 4n Hall element or ask the output voltage of 2n Hall element in arithmetic mean or the every loop to ask first arithmetic mean to sue for peace again through circuit through circuit has been eliminated the original reason error-site error of Hall current sensor theoretically; From (35), (36) 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 the size of the sensitivity of current sensor, 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 open ring type Hall current sensor that large raising arranged, the current sensor measurement lower limit has been reduced

Doubly; Be the 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, when getting n=1, be the two gap structures of the every loop of coaxial double loop, this moment, the minimum rated current of current sensor was

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 be selected the iron-nickel alloy sheet of the low oriented silicon steel disc of cost or nickeliferous 50%, be processed into two air gap magnetic cores, make core-theaded type open ring type Hall current sensor really accomplish good and cheap.

5, adopting another patent of inventor's application--core-theaded type High Precision Open-loop type Hall current sensor makes up with coaxial double loop core structure assembly with electronic circuit, make core-theaded type open ring type Hall current sensor precision reach 0.2%FS, its offset voltage temperature is floated and is reached 50ppm/ ℃～200ppm/ ℃, operation temperature area reaches-40～85 ℃, also makes the current sensor measurement span bring up to nearly 60 times from nearly 20 times simultaneously.

Therefore, the invention provides a kind of core structure 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 fixed mount, the consistance of width and Hall element setting height(from bottom), improved the consistance of core-theaded type open ring type Hall current sensor, reliability, be provided with 2n air gap on each toroidal core simultaneously, 2n air gap or symmetrical or divide equally each toroidal core, 4n air gap arranged in dislocation or symmetrical or divide equally whole coaxial double loop, eliminate the remanent magnetism of magnetic core to the impact of the measuring accuracy of current sensor, also greatly reduced the site error of current－carrying conductor in feedthrough hole; Be provided with position, interconnective hole between printed circuit board and the fixed mount, 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 (6)

1. a core-theaded type High Precision Open-loop type Hall current sensor is with coaxial double loop core structure assembly, it is characterized in that, comprise two measure-alike toroidal cores and a fixed mount, the coaxial upper and lower surface that is installed in described fixed mount of described two toroidal cores, be provided with 2n air gap on described each toroidal core, a described 2n air gap or symmetrical or divide equally each toroidal core, 4n 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 assembly is installed on the printed circuit board, Hall element in the toroidal core air gap of described assembly lower floor directly is connected with described printed circuit board, and the Hall element in the toroidal core air gap on described assembly 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 fixed mount 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 Open-loop type Hall current sensor according to claim 1 is characterized in that with coaxial double loop core structure assembly, and toroidal core rushes lamination by the riveting of iron-nickel alloy cold punching sheet and forms; Or reeled by the oriented silicon steel disc of high-quality and to form.

3. a kind of core-theaded type High Precision Open-loop type Hall current sensor according to claim 2 is characterized in that with coaxial double loop core structure assembly, and magnetic core pilot hole or locating slot are set on the described toroidal core.

4. a kind of core-theaded type High Precision Open-loop type Hall current sensor according to claim 1 is characterized in that with coaxial double loop core structure assembly, and 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.

5. a kind of core-theaded type High Precision Open-loop type Hall current sensor according to claim 3 is with coaxial double loop core structure assembly, it is characterized in that, be provided with fixed orifice on the described fixed mount, also be provided with fixed orifice in the described printed board, fixedly draw toroidal core, the fixed orifice on the fixed mount that pin passes with pilot hole and link to each other with the printed board of current sensor circuit.

6. a kind of core-theaded type High Precision Open-loop type Hall current sensor according to claim 1 is characterized in that with coaxial double loop core structure assembly, and described toroidal core and corresponding fixed mount are circular or square.

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