CN203481806U - Magnetic resistance current limiter - Google Patents
Magnetic resistance current limiter Download PDFInfo
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- CN203481806U CN203481806U CN201320459717.3U CN201320459717U CN203481806U CN 203481806 U CN203481806 U CN 203481806U CN 201320459717 U CN201320459717 U CN 201320459717U CN 203481806 U CN203481806 U CN 203481806U
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Abstract
The utility model discloses a magnetic resistance current limiter. The magnetic resistance current limiter comprises a substrate, a magnetic resistance sensor layer, a first insulating layer, a coil, a second insulating layer, a magnetic shielding layer, an input electrode and an output electrode. The coil is located between the magnetic shielding layer and the magnetic resistance sensor layer, the first insulating layer is used for isolating the magnetic resistance sensor layer and the coil, the second insulating layer is used for isolating the coil and the magnetic shielding layer, and the magnetic resistance sensor layer is in series with the coil and then connected with the input electrode and the output electrode. The magnetic resistance sensor layer comprises N array magnetic tunnel junction rows, the coil comprises conductive rows that are in 2*N+M (N>1, M=-1 or 3) row series connection or in N+M (N>1, M=0 or 2) row parallel connection, currents flow into the conductive rows positioned upper or lower the tunnel junction rows with the same direction, and an uniform magnetic field is generated at the magnetic tunnel junction rows. The magnetic resistance current limiter is characterized by fast response speed, continuous operation, and effects both on current increasing and decreasing and the like.
Description
Technical field
The utility model relates to Magnetic Sensor technical field, particularly a kind of novel magnetic resistance flow restricter.
Technical field
In electronic circuit, existence due to industrial power network fluctuation, for example access or disconnect other electrical equipment in the electrical network, and due to false wiring or components and parts lost efficacy and power circuit when opening, the factors such as the instantaneous charging of capacitive element all may cause high rush of current, and electronic devices and components are damaged as LED etc.Another kind of situation is on the other hand, and the fluctuation of line voltage causes the instantaneous undertension that occurs in circuit, causes operating current lower than running current value.
In order to address this problem; need to adopt electric heating element to protect electronic component as flow restricter; by electric heating element self performance parameters, as making can increase when the high electric current resistance, the change of resistance reduces electric current; when undercurrent, can reduce resistance and increase electric current; and when stablizing, make resistance return back to the restriction that normal resistance values realizes electric current, with the element in protective circuit.Conventionally the electric heating element adopting is divided into two kinds, and a kind of is the electric heating element of positive temperature coefficient, when electric current increases, and electric heating element heating, temperature raises and causes resistance to increase fast, thereby reduces current amplitude.And AC-DC power circuit for example in the circuit existing for capacitive element, when starting, capacitor charging causes instantaneous peak current, adopt the electric heating element of another negative temperature coefficient of resistance, at initial period, there is high resistance, the temporary impact electric current of the capacitor charging while starting for limiting, when electric capacity works, resistance starts heating temp and raises, cause resistance to reduce, consumption is reduced.
But electric heating element, for current limitation, exists following shortcoming and defect:
1) variation of electric heating element resistance depends on the variations in temperature that heat causes, the rising of temperature and decline need certain hour conventionally, therefore its response speed is slower, and the variation of temperature depends on the residing environment of electric heating element, the for example variation of ambient temperature, and near other elements that may exist electric heating element all may affect its respective amount and corresponding speed as pcb board etc.;
2) if electric current produces peak value continuously in circuit in the very short time at interval, electric heating element can produce corresponding when starting, for the variation occurring below, because temperature cannot return to stable operating state at short notice, so cannot bring into play metering function;
3) electric heating element can only make the impulse current in circuit be restricted, and the situation for electric current lower than normal value can not play a role, thereby make electric current reduce amplitude, is limited.
Summary of the invention
In order to address the above problem, the utility model provides a kind of novel magnetic resistance flow restricter, the feature of utilizing magnetic tunnel-junction electrical resistance external magnetic field to change, by coil, current transitions is become to magnetic field, when electric current increases, magnetic field increases, cause magnetic tunnel-junction resistance to increase, thereby electric current increasing degree is limited, when circuit recovers normal, magnetic field and resistance can be got back to rapidly normal value, or another kind of situation, when electric current reduces, magnetic field reduces, magnetic tunnel-junction resistance reduces, thereby making electric current reduce amplitude is limited, when circuit recovers normal, magnetic field and resistance are got back to normal value.
The utility model provides a kind of magnetic resistance flow restricter, comprising: substrate, input electrode, output electrode, magnetoresistive sensor layer, the first insulating barrier, coil, the second insulating barrier and magnetic masking layer; Coil is between magnetic masking layer and magnetoresistive sensor layer, and the first insulating barrier is separated coil and magnetoresistive sensor layer, and the second insulating barrier is separated coil and magnetic masking layer; Magnetoresistive sensor layer comprises that the magnetic tunnel-junction of the capable array of N is capable, N is greater than 1 integer, every row magnetic tunnel-junction is capable comprises one or more interconnected magnetic tunnel junction cells, between magnetic tunnel-junction is capable, with series, parallel or mixing connection in series-parallel, form the two-port structure of magnetoresistive sensor layer, coil also has two-port structure, port of magnetoresistive sensor layer and a port of coil join, another port of magnetoresistive sensor layer is connected with input electrode, and the another port of coil is connected with output electrode; Electric current flows into magnetoresistive sensor layer through input electrode, then flows out from output electrode through coil.
Preferably, the resistance of described magnetoresistive sensor layer is linear with the magnetic field that electric current produces of the input electrode-output electrode of flowing through, or the resistance of described magnetoresistive sensor layer becomes symmetrical linear distribution feature with the absolute value in the magnetic field that electric current produces of the input electrode-output electrode of flowing through, when the electric current of the input electrode-output electrode of flowing through is normal value, the resistance of described magnetoresistive sensor layer is in minimum value or maximum value position, and with direct current, increase or reduce, the also corresponding increase or reduce of its corresponding resistance.
Preferably, the connected mode between described magnetic tunnel junction cell is that series, parallel or connection in series-parallel mix, and the magnetic susceptibility axle of described magnetic tunnel junction cell is capable perpendicular to magnetic tunnel-junction.
Preferably, described coil comprises (2*N+M) individual conductive row, N>1 wherein, M=-1 or 3, and be connected in series between described conductive row, it is capable that described conductive row is parallel to described magnetic tunnel-junction, the described conductive row of part be positioned at described magnetic tunnel-junction capable above or below, the described conductive row of part is between described magnetic tunnel-junction is capable in addition, electric current positive direction flow into be positioned at described magnetic tunnel-junction capable on or under conductive row, flow into the conductive row between two described magnetic tunnel-junctions are capable in the other direction.
Preferably, coil comprises (N+M) individual conductive row, N>1 wherein, M=0 or 2, and be connected in parallel between described conductive row, it is capable that described conductive row is parallel to described magnetic tunnel-junction, described conductive row be positioned at described magnetic tunnel-junction capable above or below, the equidirectional inflow of electric current conductive row described in each.
Preferably, when M>0, the cross section of each conductive row of described coil measure-alike; When M=0 or M < 0, by changing the sectional dimension of the conductive row of described coil, thereby guarantee to produce constant responsive axial magnetic field in the capable position of each magnetic tunnel-junction of described magnetoresistive sensor layer.
Preferably, the material of described the first insulating barrier, described the second insulating barrier is silicon dioxide, aluminium oxide, silicon nitride, photoresist or benzocyclobutene.
Preferably, described coil is made by copper, gold or silver-colored this high conductivity metal material.
Preferably, described magnetic masking layer is made by this high magnetic permeability ferrimag of NiFe, CoFeSiB, CoZrNb, CoFeB, FeSiB or FeSiBNbCu.
Preferably, the thickness of described coil is 1-10 um, and the width of described conductive row is 5-40 um, and the spacing between adjacent two described conductive row is 10-100 um.
Preferably, the thickness of described the first insulating barrier, described the second insulating barrier is 100-1000 nm.
Preferably, the thickness of described magnetic masking layer is 1-10 um.
Compared with prior art, the utlity model has following beneficial effect:
(1) the novel magnetic resistance flow restricter that the utility model provides, adopts semiconductor technology preparation completely, can realize batch production, reduces production costs, and improves the consistency of product;
(2) resistance of magnetoresistive sensor layer and magnetic responsiveness speed are fast, also have more high sensitivity simultaneously, and have the feature of low-power consumption, do not generate heat, therefore affected by environment less, repeatable strong;
(3) work of magnetic resistance flow restricter is not subject to adjacent current to impact the restriction that event time occurs, and instant response can be provided.
Magnetic resistance flow restricter, except can realizing the restriction of common impact electric current, can also carry out restriction to the electric current lower than normal value.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the end view (transducer is positioned under coil) of a kind of topological structure of magnetic resistance flow restricter.
Fig. 2 is the end view (transducer is positioned on coil) of the another kind of topological structure of magnetic resistance flow restricter.
Fig. 3 is the capable and 2*N+M(M=3 of typical N row magnetic tunnel-junction in parallel) vertical view of row series connection conductive row magnetic resistance flow restricter.
Fig. 4 is the capable and 2*N+M(M=3 of typical N row series connection magnetic tunnel-junction) vertical view of row series connection conductive row magnetic resistance flow restricter.
Fig. 5 is the capable and N+M(M=2 of typical N row series connection magnetic tunnel-junction) vertical view of the capable magnetic resistance flow restricter of row parallel conductance.
Fig. 6 is the capable and N+M(M=2 of typical N row magnetic tunnel-junction in parallel) the capable magnetic resistance flow restricter of row parallel conductance vertical view.
Fig. 7 is the capable and N+M(M=0 of typical N row magnetic tunnel-junction in parallel) vertical view of the capable magnetic resistance flow restricter of row parallel conductance.
Fig. 8 is the capable and N+M(M=0 of typical N row series connection magnetic tunnel-junction) vertical view of the capable magnetic resistance flow restricter of row parallel conductance.
Fig. 9 is the vertical view of capable and 2*N+M (M=-1) the row series connection conductive row magnetic resistance flow restricter of typical N row series connection magnetic tunnel-junction.
Figure 10 is the capable and 2*N+M(M=-1 of typical N row series connection magnetic tunnel-junction) vertical view of row series connection conductive row magnetic resistance flow restricter.
Figure 11 is the capable and N+M(M=0 of typical N row magnetic tunnel-junction in parallel) vertical view of the capable magnetic resistance flow restricter of row parallel conductance.
Figure 12 is the capable and 2*N+M(M=-1 of typical N row magnetic tunnel-junction in parallel) vertical view of row series connection conductive row magnetic resistance flow restricter.
Figure 13 is the capable and 2*N+M(M=-1 of typical N row series connection magnetic tunnel-junction) vertical view of row series connection conductive row magnetic resistance flow restricter.
Figure 14 is the capable and N+M(M=0 of typical N row series connection magnetic tunnel-junction) vertical view of the capable magnetic resistance flow restricter of row parallel conductance.
Figure 15 is the distribution map of magnetic masking layer and the energising series connection conductive row coil magnetic line of force.
Figure 16 be magnetic masking layer and energising series connection conductive row coil in sensitive axes that magnetoresistive sensor layer produces the distribution map to magnetic-field component.
Figure 17 for the conductive row two ends sectional dimension of connecting by increases as increase width after in sensitive axes that magnetoresistive sensor layer produced the distribution map to magnetic-field component.
Figure 18 is the distribution map of magnetic masking layer and the energising parallel conductance line circle magnetic line of force.
Figure 19 be magnetic masking layer and energising parallel conductance line circle in sensitive axes that magnetoresistive sensor layer produces the distribution map to magnetic-field component.
Figure 20 is for by reducing bridging coil two ends sectional dimension as increased after width the distribution map to magnetic-field component in sensitive axes that magnetoresistive sensor layer produced.
Figure 21 is air layer and magnetic masking layer field decay factor computation model schematic diagram in uniform magnetic field.
Figure 22 is the distribution curve of air layer magnetic field B y component.
Figure 23 is the distribution curve of magnetic masking layer magnetic field B y component.
Figure 24 is that magnetic tunnel-junction unidirectional linearity increases resistance-magnetic signature curve chart.
Figure 25 is that magnetic tunnel-junction linear axisymmetric increases resistance-magnetic signature curve chart.
Figure 26 is the application schematic diagram of magnetic resistance flow restricter in direct-current LED circuit for lamp.
Figure 27 is the application schematic diagram of magnetic resistance flow restricter in AC LED lamp circuit.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Embodiment mono-
The utility model provides a kind of magnetic resistance flow restricter, and Fig. 1 and 2 is the end view to two kinds of topological structures that should magnetic resistance flow restricter respectively.This magnetic resistance flow restricter comprises substrate 1(1 '), magnetoresistive sensor layer 2(2 '), the first insulating barrier 3(3 '), coil 4(4 '), the second insulating barrier 5(5 ') and magnetic masking layer 6(6 ').Its coil 4(4 ') be positioned at magnetic masking layer 6(6 ') and magnetoresistive sensor layer 2(2 ') between, the first insulating barrier 3(3 ') separate coil 4(4 ') and magnetoresistive sensor layer 2(2 '), the second insulating barrier 5(5 ') separation coil 4(4 ') and magnetic masking layer 6(6 ').In the topological structure shown in Fig. 1, magnetic masking layer 6 is positioned on coil 4, and magnetoresistive sensor layer 2 is located immediately on substrate 1, and in the topological structure shown in Fig. 2, coil 4 ' is positioned on magnetic masking layer 6 ', and magnetic masking layer 6 ' is located immediately on substrate 1.
Magnetoresistive sensor layer 2(2 ') comprise that the magnetic tunnel-junction of the capable array of N is capable, N is greater than 1 integer, every row magnetic tunnel-junction is capable comprises one or more interconnected magnetic tunnel junction cells, between magnetic tunnel junction cell, can be that series, parallel or connection in series-parallel mix connection, the magnetic susceptibility axle of magnetic tunnel junction cell be capable perpendicular to magnetic tunnel-junction.Between magnetic tunnel-junction is capable with series, parallel or mix the two-port structure that connection in series-parallel forms magnetoresistive sensor layer, coil 4(4 ') also there is two-port structure.Fig. 3-14 are the vertical view of magnetic resistance flow restricter, can find out, magnetoresistive sensor layer 2(2 ') port and coil 4(4 ') a port be connected, another port is connected with input electrode 8, another port of coil is connected with output electrode 7, thereby between magnetoresistive sensor layer and coil, form cascaded structure, electric current flows into magnetoresistive sensor layer 2(2 ' through input electrode 8), then through coil 4(4 ') from output electrode 7, flow out.Coil 4(4 ') comprise a plurality of conductive row, its line number is relevant to magnetic tunnel-junction line number N, and both are parallel to each other, magnetic tunnel-junction line position on conductive row or under position.
Magnetoresistive sensor layer 2(2 ') and coil 4(4 ') there are following several different forms:
In the flow restricter of magnetic resistance shown in Fig. 3-6, magnetoresistive sensor layer comprises that the magnetic tunnel-junction of N array is capable, magnetic tunnel junction cell in every row is connected in series, and between magnetic tunnel-junction is capable, series connection forms the magneto-resistive transducing layer 2(1 as Fig. 4, Fig. 5 as shown in) two-port structure or the magneto-resistive transducing layer 2(0 of formation in parallel as shown in Fig. 3, Fig. 6) two-port structure.For these two kinds of magnetoresistive sensor layer structures, corresponding coil has two kinds of structures: one is that coil comprises 2*N+M(M=3) individual conductive row, and form as Fig. 3, Fig. 4 coil 4(0 between each conductive row) being connected in series as shown in part.Partially conductive line position in magnetic tunnel-junction capable above or below, partially conductive line position is between magnetic tunnel-junction is capable in addition, electric current positive direction flow into be positioned at magnetic tunnel-junction capable on or under conductive row, and these conductive row with positive direction electric current have identical sectional dimension, electric current oppositely flows into the conductive row of magnetic tunnel-junction between capable, and these conductive row sectional dimensions with electric current are in the other direction identical; It two comprises N+M(M=2 for coil) individual conductive row, and between each conductive row, form as Fig. 5, Fig. 6 coil 4(1) being connected in parallel as shown in part, conductive row be all positioned at magnetic tunnel-junction capable above or below, electric current flow into be in the same way positioned at magnetic tunnel-junction capable on or under conductive row, and each conductive row has same cross-sectional size.
In the flow restricter of magnetic resistance shown in Fig. 7-10, magnetoresistive sensor layer comprises that N(N is greater than 1 integer) individual array magnetic tunnel-junction is capable, magnetic tunnel junction cell during each magnetic tunnel-junction is capable is connected in series, and between magnetic tunnel-junction is capable, series connection forms the magnetoresistive sensor layer 2(5 as Fig. 8, Fig. 9 as shown in) two-port structure or the magnetoresistive sensor layer 2(4 of formation in parallel as shown in Fig. 7, Figure 10) two-port structure.For these two kinds of magnetoresistive sensor layer structures, corresponding coil 4 has two kinds of structures: one is that coil comprises 2*N+M(M=-1) individual conductive row, and between conductive row, form as Fig. 9,10 coil 4(4) as shown in be connected in series.Partially conductive line position in magnetic tunnel-junction capable above or below, partially conductive line position is between magnetic tunnel-junction is capable in addition, electric current positive direction flow into be positioned at tunnel junction capable on or under conductive row, flow into the conductive row between magnetic tunnel-junction is capable in the other direction, first with last be positioned at magnetic tunnel-junction capable on or under conductive row cross section with respect to centre position be positioned at tunnel junction capable on or under the cross sectional dimensions of conductive row increase, to produce identical magnetic susceptibility axle magnetic-field component at the capable place of corresponding magnetic tunnel-junction, be that electric current produces constant responsive axial magnetic field in the capable position of each tunnel junction of magnetoresistive sensor layer.It is two for comprising N+M(M=0) individual conductive row, and between conductive row, form as Fig. 7, Fig. 8 coil 4(5) being connected in parallel as shown in part, conductive row be all positioned at magnetic tunnel-junction capable above or below, the equidirectional inflow of electric current is all be positioned at magnetic tunnel-junction capable on or under conductive row, first with last be positioned at magnetic tunnel-junction capable on or under conductive row cross section to for centre position, be positioned at tunnel junction capable on or under the sectional dimension of conductive row reduce, to produce same magnetic sensitive axes to magnetic-field component at the capable place of corresponding magnetic tunnel-junction.
In the magnetic resistance flow restricter shown in Figure 11-14, it is capable that magnetoresistive sensor layer comprises N=2 the magnetic tunnel-junction being arranged in parallel, magnetic tunnel junction cell during each magnetic tunnel-junction is capable is connected in series, and is connected in series and forms as the magnetoresistive sensor layer 2(3 as shown in Figure 13, Figure 14 between magnetic tunnel-junction is capable) two-port structure or the magnetoresistive sensor layer 2(2 of formation as shown in Figure 11, Figure 12 that be connected in parallel) two-port structure.For these two kinds of magnetoresistive sensor layers, corresponding coil 4 has two kinds of structures, one is that coil 4 comprises 2*N+M(M=-1) individual conductive row, and between conductive row, be connected in series and form as Figure 12, coil 4(3 shown in Figure 13), partially conductive line position in magnetic tunnel-junction capable above or below, partially conductive line position is between magnetic tunnel-junction is capable in addition, electric current positive direction flow into be positioned at tunnel junction capable on or under conductive row, flow into the conductive row between tunnel junction is capable in the other direction, first with last be positioned at magnetic tunnel-junction capable on or under conductive row cross sectional dimensions identical, the identical magnetic susceptibility axle magnetic-field component producing in the capable place of corresponding magnetic tunnel-junction.It two comprises N+M(M=0 for coil 4) individual conductive row, between conductive row, form the coil 4(2 as shown in Figure 11, Figure 14), conductive row be all positioned at magnetic tunnel-junction capable above or below, the equidirectional inflow of electric current be positioned at tunnel junction capable on or under conductive row, first with last be positioned at magnetic tunnel-junction capable on or under conductive row cross sectional dimensions identical, the magnetic susceptibility axle magnetic-field component producing at the capable place of corresponding magnetic tunnel-junction is identical.
Figure 15 shows that the series connection conductive row coil 4(0 shown in corresponding diagram 3, Fig. 4) and magnetic masking layer 6(6 ') at direct current, flow through the vector distribution map in the magnetic field that produces in input-output electrode situation, as can be seen from the figure, electric current is in generation toroidal magnetic field, conductive row place, through magnetic masking layer 6(6 ') after intensity be enhanced.Figure 16 be each conductive row in magnetic tunnel junction cell position the distribution curve along magnetic susceptibility direction of principal axis magnetic-field component By, can find out, correspond to highfield amplitude be positioned at tunnel junction capable on or under the characteristics of geomagnetic field distribution of the magnetic-field component By that produces of the conductive row with same current direction identical, and the magnetic-field component By that the conductive row in the same way at two ends produces will be higher than interlude.Therefore, magnetic tunnel-junction is capable during only corresponding to the equidirectional current conduction row of interlude, and all magnetic tunnel junction cells of guarantee are experienced identical magnetic-field component By.
In order to study magnetic masking layer 6(6 ') impact on magnetic-field component By distribution characteristics, Figure 16 has also shown under without magnetic masking layer condition, the characteristics of geomagnetic field distribution curve of magnetic-field component By.Can find out, its magnetic field amplitude is significantly less than the situation of magnetic masking layer.Therefore, magnetic screen flaggy effect is exactly the amplitude that improves magnetic-field component By.
Figure 17 is the conductive row coil 4(4 that connects in corresponding diagram 9, Figure 10), by increasing two ends conductive row sectional dimension, with this, reduce the magnetic field amplitude of the magnetic-field component By of end positions place, thereby the Distribution of Magnetic Field figure of acquisition and interlude same magnitude, can find out, the equidirectional current conduction row of all correspondences has identical magnetic field amplitude, thus tunnel junction capable can be placed on all conductive row in the same way that comprise two ends or under.
For the conductive row coil 4(3 that connects in Figure 12, Figure 13), due to only have two be positioned at magnetic tunnel-junction capable on or under conductive row in the same way, and all in two ends, obviously it is capable produced identical to the amplitude of magnetic-field component By along sensitive axes of corresponding magnetic tunnel-junction.
Figure 18 is coil 4(1 that in corresponding diagram 5, Fig. 6, parallel conductance is capable) and magnetic masking layer 6(6 ') direct current flow through in input-output electrode situation the vector distribution map in generation magnetic field.Can find out, magnetic field is around conductive row, equally at shielding flaggy 6(6 ') in be enhanced.Figure 19 is that same direction current conductive row produces sensitive axes to the distribution map of magnetic-field component By in place, magnetic tunnel-junction position, can find out there is being magnetic masking layer 6(6 ') in the situation that, the amplitude of its magnetic-field component By is higher.Same magnetic-field component By is identical in the magnetic field distribution at interlude conductive row place, and the magnetic field amplitude of two ends conductive row will be lower than interlude.Therefore, the capable interlude that is only positioned over of magnetic tunnel-junction, all magnetic tunnel-junctions of guarantee are experienced identical magnetic-field component By.
Figure 20 is the coil 4(5 that in corresponding diagram 7, Fig. 8, parallel conductance is capable), by reducing the sectional dimension of two ends conductive row, with this, increase its current density, to improve the corresponding magnetic field amplitude of two ends conductive row, thereby make interlude and two ends conductive row produce the Distribution of Magnetic Field figure of the magnetic-field component By of same magnetic field amplitude, thus magnetic tunnel-junction is capable can be capable corresponding to all parallel conductances.
The coil 4(2 that the corresponding parallel conductance of Figure 11, Figure 14 is capable) only comprise two conductive row in the same way that corresponding magnetic tunnel-junction is capable, and be positioned at end positions, thus its produce the amplitude of magnetic-field component By identical, without adjusting sectional dimension.
Magnetic masking layer 6(6 ' used in Figure 15 and Figure 18); can be so that coil 4(4 ') the magnetic-field component By that produces in magnetic tunnel junction cell position of conductive row be largely increased; on the other hand, can also make magnetic tunnel junction cell be protected, avoid the impact of external magnetic field.The attenuation model of its external magnetic field is shown in Figure 21; in the uniform magnetic field Bs producing in helmholtz coil; there is no magnetic masking layer 6(6 ') time; its magnetic susceptibility axial magnetic field component distributes as shown in figure 22, and is increasing magnetic masking layer 6(6 ') time, its corresponding Ba Distribution of Magnetic Field is as shown in figure 12; its field decay factor is about 9:1; be external magnetic field through magnetic masking layer 6(6 ') afterwards, its amplitude fading is to original 1/9th, thus effectively protected magnetic tunnel junction cell.
The indicatrix of the resistance of magnetoresistive sensor layer and external magnetic field relation plays a decisive role to magnetic resistance flow restricter.And indicatrix depends on the angular relationship between free layer and pinning layer in magnetic tunnel junction cell, also depends on the skew of indicatrix simultaneously.Indicatrix as shown in figure 24, in forward magnetic field range, with magnetic field, increase, linear the increasing of resistance of magnetoresistive sensor layer, this situation is applicable to DC circuit, coil 4(4 ') it is capable that the magnetic-field component By that conductive row produces acts on magnetic tunnel-junction, when operating current is normal value, the resistance of magnetoresistive sensor layer is in maximum or minimum value position, when in circuit, electric current reduces suddenly, coil 4(4 ') the By magnetic field that produces also reduces, magnetoresistive sensor layer 2(2 ') resistance reduces, thereby making in DC circuit electric current reduce amplitude is limited, when electric current increases suddenly in circuit, coil 4(4 ') the By magnetic field that produces increase, magnetoresistive sensor layer 2(2 ') resistance increase, thereby electric current increasing degree in DC circuit is limited.
As shown in figure 25, the resistance of magnetoresistive sensor layer and external magnetic field characteristic relation curve have axial symmetry distribution characteristics, and increase with magnetic field amplitude, and resistance increases.This situation is applicable to alternating current circuit metering function, during running current, the resistance of magnetoresistive sensor layer is in minimum value or maximum value position, no matter be that forward current amplitude increases, or reverse current amplitude increases, all can cause the resistance of magnetoresistive sensor layer to increase, thereby alternating current increasing degree is limited; When resistance position is during in maximum, when electric current is less than normal value, with magnetic field, reduce, cause resistance to reduce, thereby make electric current reduce amplitude, limited.
As shown in figure 26, AC power obtains direct current after over commutation, filtering, and gives LED lamp 20 power supplies through magnetic resistance flow restricter 21.This magnetic resistance flow restricter 21 comprises substrate 1(1 '), magnetoresistive sensor layer 2(2 '), coil 4(4 '), magnetic masking layer 6(6 '), the first insulating barrier 3(3 '), the second insulating barrier 5(5 '), input electrode 7 and output electrode 9, its coil 4(4 ') be positioned at magnetoresistive sensor layer 2(2 ') and magnetic masking layer 6(6 ') between, the first insulating barrier 3(3 ') and the second insulating barrier 5(5 ') respectively between magnetoresistive sensor layer 2(2 ') and electric current 4(4 ') and current sheet 4(4 ') and magnetic masking layer 6 between, coil 4(4 ') and magnetoresistive sensor layer 2(2 ') series connection, magnetoresistive sensor layer 2(2 ') with coil 4(4 ') another port be connected respectively input electrode 7 and output electrode 8.Its topological structure has two kinds of forms, one is that magnetoresistive sensor layer 2 is located immediately on substrate 1, coil 4 is positioned on magnetoresistive sensor layer 2, and magnetic masking layer 6 is positioned at top, it two is located immediately on substrate 1 ' for magnetic masking layer 6 ', magnetoresistive sensor layer 2 ' is positioned at top, and coil 4 ' is positioned under magnetoresistive sensor layer 2 '.Magnetoresistive sensor layer 2(2 ') comprising that N(N is greater than 1 integer) magnetic tunnel-junction of individual array is capable, in every row, magnetic tunnel junction cell is connected in series, between magnetic tunnel-junction is capable, is connected in series or is connected in parallel into two-port structure, the magnetic susceptibility axle of magnetic tunnel junction cell is capable perpendicular to magnetic tunnel-junction.Corresponding coil has two kinds of connected modes, one is that conductive row is connected in series, comprise 2*N+M(M=-1 or 3) individual conductive row, electric current forward flow into be positioned at magnetic tunnel-junction capable on or under conductive row, oppositely flow into the conductive row between magnetic tunnel-junction is capable, it comprises N+M(M=0 or 2 two for conductive row is connected in parallel) individual conductive row, electric current flow into be in the same way positioned at tunnel junction capable on or under conductive row.During M>0, the conductive row of coil can have identical sectional dimension, in addition each conductive row cross sectional dimensions can change with magnetic tunnel junction cell place thereon or under it produce identical along sensitive axes to magnetic-field component.
Wherein, the first insulating barrier 3(3 '), composition material the second insulating barrier 5(5 ') is the materials such as silicon dioxide, aluminium oxide, silicon nitride, photoresist or benzocyclobutene, its thickness is 100-1000 nm, coil 4(4 ') be Cu, the high conductivity material such as Au or Ag, its thickness is within the scope of 1-10 um, and conductive row width is 5-40 um, and the spacing between adjacent conductive row is 10-100 um.Magnetic masking layer 6(6 ') be NiFe, CoZrNb, CoFeSiB, CoFeB, FeSiB, the high-permeability alloy materials such as FeSiBNbCr, its thickness is within the scope of 1-10 um.
Direct current flows into magnetoresistive sensor layer 2(2 ' through input electrode 7), rear inflow coil 4(4 '), finally by output electrode 8, flow out.When AC supply voltage occurs that fluctuation causes circuit working electric current to increase, coil 4(4 ') in conductive row, electric current increases, cause it in capable the produced sensitive axes of magnetic tunnel-junction, to magnetic-field component By, to increase, because having unidirectional linearity, magnetoresistive sensor layer now increases resistance-magnetic signature, and during running current, resistance is in minimum value position, therefore magnetic field increases the resistance increase that causes magnetoresistive sensor layer, thereby electric current increasing degree is limited, LED lamp 20 is protected, when supply voltage recovers normal, it is normal that current amplitude recovers, the resistance of magnetoresistive sensor layer and magnetic field all return to initial value, another situation is, while causing in circuit due to AC supply voltage fluctuation that operating current reduces, in conductive row, electric current reduces to cause it at capable the produced magnetic susceptibility axial magnetic field component By of magnetic tunnel-junction, to reduce, now magnetoresistive sensor layer still selects to have unidirectional linearity increases resistance-magnetic signature, when operating current is normal, resistance is in maximum value position, so magnetic field reduces to cause the resistance of magnetoresistive sensor layer to reduce, thereby make electric current reduce amplitude, limited.
As shown in figure 27, magnetic resistance occluder configurations as mentioned above, and AC power is directly given LED lamp 22-23 power supply, LED lamp is connected with reverse parallel connection by forward, when AC power is worked within the scope of positive half cycle, 22 work of forward LED lamp, when alternating current is when negative half period is worked, oppositely LED lamp 23 work.Magnetic resistance flow restricter 24 is connected with LED lamp 22-23, and working alternating current flows into magnetoresistive sensor layer 2(2 ' through input electrode 7), rear inflow coil 4(4 '), through electric current output electrode 8, flow out.Now select to have the magnetoresistive sensor layer of synistor-magnetic signature, and electrical resistance magnetic field amplitude increases and increases, when operating current is normal value, resistance is in minimum value position, when AC power is when forward produces fluctuation, magnetic-field component By increases in the amplitude of forward, thereby cause the resistance of magnetic resistance flow restricter to increase, forward current amplitude is limited, LED lamp 22 is protected, when AC power is when oppositely producing fluctuation, magnetic-field component By increases in reverse amplitude, the resistance of magnetic resistance flow restricter increases equally, reverse current amplitude is limited, LED lamp 23 is protected, when AC power recovers normal, it is normal that electric current recovers, now the resistance of induced field component By and magnetoresistive sensor layer recovers normal, make LED lamp recover normal condition.Another kind of situation is that AC power fluctuation causes operating current to reduce, now still occupy the magnetoresistive sensor layer of selecting to have synistor-magnetic signature, alternating current positive-negative half-cycle is corresponding magnetic field-resistance positive-negative half-cycle respectively, and when operating current is normal, resistance is respectively in corresponding maximum value position, when operating current reduces, cause magnetic-field component By to reduce, thereby the resistance of magnetoresistive sensor layer is reduced, thereby make electric current reduce amplitude, limited.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (12)
1. a magnetic resistance flow restricter, is characterized in that: it comprises:
Substrate, input electrode, output electrode, magnetoresistive sensor layer, the first insulating barrier, coil, the second insulating barrier and magnetic masking layer;
Coil is between magnetic masking layer and magnetoresistive sensor layer, and the first insulating barrier is separated coil and magnetoresistive sensor layer, and the second insulating barrier is separated coil and magnetic masking layer;
Magnetoresistive sensor layer comprises that the magnetic tunnel-junction of the capable array of N is capable, N is greater than 1 integer, every row magnetic tunnel-junction is capable comprises one or more interconnected magnetic tunnel junction cells, between magnetic tunnel-junction is capable, with series, parallel or mixing connection in series-parallel, form the two-port structure of magnetoresistive sensor layer, coil also has two-port structure, port of magnetoresistive sensor layer and a port of coil join, another port of magnetoresistive sensor layer is connected with input electrode, and the another port of coil is connected with output electrode; Electric current flows into magnetoresistive sensor layer through input electrode, then flows out from output electrode through coil.
2. a kind of magnetic resistance flow restricter according to claim 1, it is characterized in that: the resistance of described magnetoresistive sensor layer is linear with the magnetic field that electric current produces of the input electrode-output electrode of flowing through, or the resistance of described magnetoresistive sensor layer becomes symmetrical linear distribution feature with the absolute value in the magnetic field that electric current produces of the input electrode-output electrode of flowing through, when the electric current of the input electrode-output electrode of flowing through is normal value, the resistance of described magnetoresistive sensor layer is in minimum value or maximum value position, and increase or reduce with direct current, the also corresponding increase or reduce of its corresponding resistance.
3. a kind of magnetic resistance flow restricter according to claim 1, is characterized in that: the connected mode between described magnetic tunnel junction cell is that series, parallel or connection in series-parallel mix, and the magnetic susceptibility axle of described magnetic tunnel junction cell is capable perpendicular to magnetic tunnel-junction.
4. a kind of magnetic resistance flow restricter according to claim 1, it is characterized in that: described coil comprises 2*N+M conductive row, N>1 wherein, M=-1 or 3, and be connected in series between described conductive row, it is capable that described conductive row is parallel to described magnetic tunnel-junction, the described conductive row of part be positioned at described magnetic tunnel-junction capable above or below, the described conductive row of part is between described magnetic tunnel-junction is capable in addition, electric current positive direction flow into be positioned at described magnetic tunnel-junction capable on or under conductive row, flow into the conductive row between two described magnetic tunnel-junctions are capable in the other direction.
5. a kind of magnetic resistance flow restricter according to claim 1, it is characterized in that: coil comprises N+M conductive row, N>1 wherein, M=0 or 2, and be connected in parallel between described conductive row, it is capable that described conductive row is parallel to described magnetic tunnel-junction, described conductive row be positioned at described magnetic tunnel-junction capable above or below, the equidirectional inflow of electric current conductive row described in each.
6. according to a kind of magnetic resistance flow restricter described in claim 4 or 5, it is characterized in that: when M>0, the cross section of each conductive row of described coil measure-alike; When M=0 or M < 0, by changing the sectional dimension of the conductive row of described coil, thereby guarantee to produce constant responsive axial magnetic field in the capable position of each magnetic tunnel-junction of described magnetoresistive sensor layer.
7. a kind of magnetic resistance flow restricter according to claim 1, is characterized in that: the material of described the first insulating barrier, described the second insulating barrier is silicon dioxide, aluminium oxide, silicon nitride, photoresist or benzocyclobutene.
8. a kind of magnetic resistance flow restricter according to claim 1, is characterized in that: described coil is made by copper, gold or silver-colored this high conductivity metal material.
9. a kind of magnetic resistance flow restricter according to claim 1, is characterized in that: described magnetic masking layer is made by this high magnetic permeability ferrimag of NiFe, CoFeSiB, CoZrNb, CoFeB, FeSiB or FeSiBNbCu.
10. a kind of magnetic resistance flow restricter according to claim 4, is characterized in that: the thickness of described coil is 1-10 um, and the width of described conductive row is 5-40 um, and the spacing between adjacent two described conductive row is 10-100 um.
11. a kind of magnetic resistance flow restricters according to claim 1, is characterized in that: the thickness of described the first insulating barrier, described the second insulating barrier is 100-1000 nm.
12. a kind of magnetic resistance flow restricters according to claim 1, is characterized in that: the thickness of described magnetic masking layer is 1-10 um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320459717.3U CN203481806U (en) | 2013-07-30 | 2013-07-30 | Magnetic resistance current limiter |
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| CN201320459717.3U CN203481806U (en) | 2013-07-30 | 2013-07-30 | Magnetic resistance current limiter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414176A (en) * | 2013-07-30 | 2013-11-27 | 江苏多维科技有限公司 | Magnetic resistance current limiter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103414176A (en) * | 2013-07-30 | 2013-11-27 | 江苏多维科技有限公司 | Magnetic resistance current limiter |
| WO2015014248A1 (en) * | 2013-07-30 | 2015-02-05 | 江苏多维科技有限公司 | Magnetoresistive current limiter |
| CN103414176B (en) * | 2013-07-30 | 2016-01-20 | 江苏多维科技有限公司 | A kind of magnetic resistance current limiter |
| US9748025B2 (en) | 2013-07-30 | 2017-08-29 | MultiDimension Technology Co., Ltd. | Magnetoresistive current limiter |
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