CN102568778B - Laminated power coil type device - Google Patents
Laminated power coil type device Download PDFInfo
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- CN102568778B CN102568778B CN201210018817.2A CN201210018817A CN102568778B CN 102568778 B CN102568778 B CN 102568778B CN 201210018817 A CN201210018817 A CN 201210018817A CN 102568778 B CN102568778 B CN 102568778B
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Abstract
The invention discloses a laminated power coil type device, which relates to laminated coil type devices. The laminated power coil type device comprises a laminated body obtained by laminating conductors and insulators, wherein coils are formed by the conductors and the insulators; the main body of each layer of sheet is a first insulator made from a magnetic material with high magnetic conductivity; the coil conductors of coil layers are arranged in the first insulator; insulating layers are arranged between every two adjacent coil layers; a part of at least one insulating layer which is clamped by the conductors is a second insulator made from a magnetic material with low magnetic conductivity or a non-magnetic conductive material. The laminated power type coil device disclosed by the invention greatly reduces magnetic leakage among the coil layers, saves cost, reduces direct current resistance, and improves temperature rise current characteristics of an inductor; and meanwhile, the laminated power type coil device has higher saturated current characteristics.
Description
Technical field
The present invention relates to laminated type coil class device, the method particularly related to by reducing coil interlayer leakage field makes stacked layer power inductance and the laminated transformer of high saturation current characteristic.
Background technology
Power inductance is used for electronic product switch type dc-dc circuit.Along with electronic product is more and more thinner to the coil such as inductor, transformer series products thickness requirement, traditional winding power inductance, because limiting by the magnetic core manufacturing process limit, has been difficult to the requirement meeting ultralow thickness; Then there is easy short circuit, size cannot be reduced further and D.C. resistance cannot be reduced when making low value product to cause the problem such as temperature-rise current characteristic and saturation current characteristic mismatch in another kind of power inductance---one-body molded power inductance.Therefore people wish that adopting stack technology to manufacture lamination-type power inductor solves the requirement of market to the ultralow thickness of coil class device.
To the transformer for power unit, also have the requirement identical with power inductance, therefore, present stage also has employing stack technology to manufacture laminated transformer.
In order to easily manufactured, people use the magnetic material identical with main body at the coil-conductor interlayer of laminated inductor usually.The center stem stem surrounded due to coil uses identical magnetic material with coil interlayer, and magnetic resistance is everywhere identical; And from Biot-Savart law, the magnetic flux density of wire surrounding space and space to the distance of wire is inversely proportional to, therefore very high and cause leakage field very serious in the magnetic flux density near surrounding them space.Serious leakage field can cause the inductance value of laminated inductor to lose on the one hand, also easily causes local magnetic saturation on the other hand, causes whole laminated inductor magnetic saturation phenomenon easily occurs and the lower problem of saturation current occurs.
For manufacturing the laminated inductor of high saturation current characteristic, application number is magnetic or the nonmagnetic material that 00122621.5 patent proposes at least to stacked the above low magnetic permeability of one deck in inductor high magnetic stack body, the magnetic flux that coil produces can leak to outside band wound coil by low magnetic permeability magnetic layer or nonmagnetic material layer, just not easily forms closed magnetic circuit in magnet inside.This reduces the possibility that magnetic saturation occurs, thus improve the saturation current characteristic of inductor.But adopt the laminated inductor that the method manufactures, due to divided each interregional do not have magnetic flux be coupled or magnetic flux significantly weaken, therefore this laminated inductor declines to a great extent relative to the inductance value of normal inductor, when making the laminated inductor of same electrical sensibility reciprocal, the laminated inductor of this structure needs more electrode coil, add cost on the one hand, also cause the D.C. resistance of laminated inductor significantly to rise on the other hand, thus the temperature-rise current characteristic of laminated inductor is reduced.
On aforementioned 00122621.5 patent basis, application number be 200610163373.6 patents propose by segmentation low magnetic permeability magnetic or the center portion thickness of nonmagnetic material thinning, to reduce the magnetic resistance of the low hub of a spool part of magnetic flux density, reach the object preventing inductance value from declining to a great extent.But in fact, the method can only be improved slightly to the problem that inductance value declines to a great extent, and adverse effect can be caused to the saturation current characteristic of inductor.
On aforementioned 00122621.5 patent basis, application number is that 200580001893.0 patents propose a kind of method reducing D.C. resistance and keep saturation current characteristic simultaneously, even if at least one width is greater than the width of other coil-conductors in laminated body in the coil-conductor on the low magnetic permeability magnetic of segmentation or nonmagnetic material two first type surface.But the method is under the prerequisite increasing laminated inductor cost, effect is reduced to D.C. resistance very not remarkable, and to the laminated inductor inductance value decline problem caused due to the magnetic of low magnetic permeability or the existence of nonmagnetic material without improvement.
Summary of the invention
The object of the present invention is to provide a kind of laminated power coil type device reducing coil interlayer leakage field, comprise the coil class devices such as stacked layer power inductor, laminated transformer.
Object of the present invention can realize like this, design a kind of laminated power coil type device, comprise the laminated body conductor of formation coil and insulator lamination formed, the main body of each sheet is layer by layer the 1st insulator of high permeability magnetic material, the coil-conductor of coil layer is arranged in the 1st insulator, between coil layer is adjacent between two, be provided with insulating barrier, the part of insulating barrier folded by conductor is the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance.
The present invention greatly reduces the leakage field of coil interlayer, therefore, greatly reduce the loss of inductance value on the one hand, manufacture same electrical sensibility reciprocal phase is significantly reduced for the ordinary inductor conductor coils number of turns, save cost and reduced D.C. resistance, having improve the temperature-rise current characteristic of inductance; Then avoid the local magnetic saturation of magnet near coil electrode and the whole laminated inductor generation magnetic saturation phenomenon of initiation thereof on the other hand, make the present invention have higher saturation current characteristic relative to normal stack inductor.
Accompanying drawing explanation
Fig. 1 is the perspective diagram of one of present pre-ferred embodiments;
Fig. 2 is the a3-a3 line cutaway view of Fig. 1;
Fig. 3 is the exploded perspective view of one of present pre-ferred embodiments laminated body;
Fig. 4 is the saturation current performance diagram of one of present pre-ferred embodiments;
Fig. 5 is the perspective diagram of present pre-ferred embodiments two;
Fig. 6 is the a4-a4 line cutaway view of Fig. 5.
Embodiment
Below in conjunction with embodiment, the invention will be further described.
Embodiment is specifically described with the example of the laminated inductor involved by laminated power coil type device.
A kind of laminated power coil type device, comprise the laminated body conductor of formation coil and insulator lamination formed, the main body of each sheet is layer by layer the 1st insulator of high permeability magnetic material, the coil-conductor of coil layer is arranged in the 1st insulator, between coil layer is adjacent between two, be provided with insulating barrier, the part of insulating barrier folded by conductor is the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance.
As shown in Figure 1, laminated inductance 702 has the substantially rectangular laminated body 701 be made up of magnetic or nonmagnetic insulating material, (in the drawings Vitrification management having been carried out to the 1st insulator 802), and the pair of external electrodes 703 formed on longitudinal two ends of laminated body 701.
The structure of laminated body 701, as shown in Figure 2, the 1st insulator 802 of the high permeability magnetic material be made up of Ni-Zn-Cu class Ferrite Material forms the main body of laminated body 701.
In laminated body 701, bury the conductor and internal electrode 803 that form spiral coil.The coil that internal electrode 803 is formed, its axial (namely coil inside magnetic flux forms direction) is the stack direction of laminated body 701.The coil that internal electrode 803 is formed, its one end is drawn from an end face of laminated body 701, and the other end is drawn from the other end of laminated body 701.The internal electrode 803 of drawing from laminated body 701 end face is connected with said external electrode 703.Internal electrode 803 and each free Ag of outer electrode 703 or take Ag as the metal material composition of main component.
Folded laminated body between each layer electrode that internal electrode 803 is adjacent between two non-fully are made up of above-mentioned the 1st insulator forming the high permeability magnetic material of laminated body 701 main body, but be made up of the magnetic material of low magnetic permeability or the 2nd insulator 804 of nonmagnetic substance, the laminated body in the laminated body central area that coil surrounds by described 2nd insulator and coil periphery region is separated completely.The outer peripheral areas of the central area that laminated inductor inner spiral coil surrounds and spiral coil uses the magnetic material of high magnetic permeability and low magnetic resistance, and the laminated body in region folded by spiral coil each layer internal electrode is made up of the material of the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance and high magnetic resistance, therefore, magnetic flux can not form leakage field by coil interlayer as normal stack inductor, only exist as shown in Figure 2 from the 204 type closed magnetic line of forces of axial direction around whole spiral coil.
The width of described 2nd insulator is equal to or less than or slightly larger than the just right width of adjacent two-layer conductor.The form that laminated body folded by described internal electrode adjacent is between two made up of the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance, can as shown in Figure 2, namely adjacent between two internal electrode is just made up of the 2nd insulator completely to the laminated body 804 of folded part; Or the width of the 2nd insulator also can be slightly be greater than the twice that the just right width of adjacent two-layer internal electrode is no more than internal electrode width; The width of the 2nd insulator can be less than the just right width of adjacent two-layer internal electrode, only need guarantee that the laminated body in laminated body central area and the coil periphery region surrounded by coil with the 2nd insulator is separated completely, this separates form and uses less 2nd insulator, can reduce the problem of the 1st insulator and the 2nd insulator top-stitching expansion coefficient mismatch.
The magnetic permeability of described 2nd insulator is the magnetic permeability less than 1/5 of the 1st insulator.The magnetic permeability of the 2nd insulator 804 of described low magnetic permeability magnetic material or nonmagnetic substance, preferably high permeability magnetic material the 1st insulator 802 1/5, and preferably less than 1/10.If magnetic permeability is the situation of less than 1/5, then the magnetic resistance of the 2nd insulator 804 will become more than 5 times, can suppress the leakage field between internal electrode thus.
Again, described 1st insulator differs 10 with the 2nd insulator coefficient of linear expansion
-7/ DEG C below.1st insulator 802 and the 2nd insulator 804, preferably coefficient of linear expansion difference is less each other.If when the 1st insulator coefficient of linear expansion forming main body is obviously greater than the 2nd insulator, then in inductance manufacture and use procedure, may occur that the 2nd occurs space between insulator and coil electrode, or be filled the material of high magnetic permeability in the axial direction and effectively can not suppress the leakage field of coil interlayer; If when the 1st insulator coefficient of linear expansion is significantly less than the 2nd insulator, then in inductance manufacture and use procedure, may crack be there is.
With reference to Fig. 3, more detailed structure explanation is carried out to laminated body 701.As shown in Figure 3, laminated body 701 has the structure of multi-piece insulator thin slice lamination in addition, namely main body is that the 1st insulator stack of sheets of high permeability magnetic material is integrated by laminated body 701, but in fact the 1st insulator thin slice has three types: the first type is in Fig. 3 shown in 901, be in outer field thin slice to be made up of the 1st insulator of high permeability magnetic material completely, 901 type insulator thin slices form the upper and lower base plate of laminated body 701; The second type is in Fig. 3 shown in 903, and chip body is made up of the 1st insulator of high permeability magnetic material, but at the desired location of thin slice, the 1st insulator is hollowed out, and is filled form internal electrode 803 by the metal material taking Ag as main component; The third type is in Fig. 3 shown in 904, and chip body is made up of the 1st insulator of high permeability magnetic material, but at the desired location of thin slice, the 1st insulator is hollowed out, and is filled by the 2nd insulator of low magnetic permeability magnetic material or nonmagnetic substance.Thin slice 904 due to the third type is between upper and lower two-layer the second type thin slice 903, and the 2nd insulator filling position be also in up and down in two-layer 903 thin slices internal electrode 803 institute just to position, therefore, after composite wafer lamination forms laminated body 701, between each layer electrode that internal electrode 803 is adjacent between two, folded laminated body is formed by the magnetic material of low magnetic permeability or the 2nd insulator 804 of nonmagnetic substance.In addition, desired location on the thin slice 904 of the third type, 1st insulator is not filled the 2nd insulator by hollowing out, this position forms through hole 902, in fact, through hole 902 position is the endpoint location of levels internal electrode 803, when lamination, this through hole 902 can be filled and realize the connection of levels internal electrode 803 by internal electrode 803, the spiral coil that final formation one is overall.Be equivalent to again the end of the winding top of coil or the internal electrode 803 of winding end, the extension 803a formed with chip edge is connected.
Other are as laminated transformer, and described coil-conductor is provided with two groups and connects mutual intussusception, and described conductor connects in order, are formed the spiral coil of the stack direction of insulator as two groups of mutual intussusceptions of axis; The part of a layer insulating folded by conductor is had at least to be the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance; Insulating barrier folded by described each layer conductor had both comprised the insulating barrier between same spiral coil conductor, also comprised the insulating barrier between two different spiral coil conductors.As shown in Figure 5, Figure 6, in the laminated body of laminated transformer, laminated body 1201 main body is the 1st insulator 1202 of high permeability magnetic material, but the laminated body folded by each layer coil-conductor 1203 (i.e. internal electrode) adjacent between two is not made up of the 1st identical insulator, but be made up of the magnetic material of low magnetic permeability or the 2nd insulator 1204 of nonmagnetic substance, the laminated body central area surround two of mutual intussusception groups of coils and the laminated body in coil periphery region are separated completely.Interlayer stack body folded by said each layer internal electrode 1203 had both comprised the interlayer stack body between same spiral coil conductor, also comprised the interlayer stack body between two different spiral coil conductors.The dotted line of the interpolation in Fig. 6 makes the delamination of each layer more clear, and in fact after laminated body sintering, the 1st insulator 1202 of high permeability magnetic material combines together; Two groups of internal electrodes 1203 are distinguished with different signs respectively.Other examples and laminated inductor are substantially close, do not make repeated description at this.
The saturation current characteristic of the laminated inductance 702 that the present embodiment relates to is with reference to being described with Fig. 4.In Fig. 4, solid line is the saturation current characteristic curve of the laminated inductance representing this example, and transverse axis represents the direct current of superposition, and the longitudinal axis represents inductance value.Again, in Fig. 4, as comparison other, the characteristic of the ordinary inductor of identical electrodes structure represented by dashed line.The laminated inductance of visible example of the present invention has higher initial inductance amount and stronger saturation current characteristic.
In an embodiment, all parts folded by two-layer internal electrode adjacent are between two all the 2nd insulator of low magnetic permeability material or nonmagnetic substance, but can some or folded by part adjacent two layers internal electrode parts be also the 2nd insulator, can reach in the region used and reduce leakage field and avoid the magnetically saturated object in local.
In above-mentioned example, as the example of laminated inductance, show the laminated inductance with a coil, but the present invention also can be, there is the laminated inductance row formula product, laminated transformer, lamination common mode choke coil etc. of multiple coil.Moreover, also can be, in laminated body, there is the lamination LC composite component and laminated filter etc. of other elements (as electric capacity) beyond inductance.
Again, what inductance of the present invention or transformer were paid close attention to is its saturation current characteristic, and in fact, owing to decreasing the leakage field between coil, the inductance value of the coil such as laminated inductor or transformer class device can significantly promote.Namely make the coil class device of same inductance value, adopt illustrated method to reduce wire circle, thus cost-saved, reduce the D.C. resistance of the coil such as laminated inductor or transformer class device.
Above content is in conjunction with concrete better embodiment further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.Scope of the present invention, is represented by claims, and the whole variation falling into these claim implications should comprise in the present invention.
Claims (5)
1. a laminated power coil type device, comprise the laminated body conductor of formation coil and insulator lamination formed, it is characterized in that: the main body of each sheet is layer by layer the 1st insulator of high permeability magnetic material, the coil-conductor of coil layer is arranged in the 1st insulator, between coil layer is adjacent between two, be provided with insulating barrier, the part of insulating barrier folded by conductor is the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance;
The width of described 2nd insulator equals the just right width of adjacent two-layer conductor, and internal electrode adjacent between two is just made up of the 2nd insulator completely to the laminated body of folded part; Or
The width of described 2nd insulator is less than the just right width of adjacent two-layer conductor, only need guarantee that the laminated body in laminated body central area and the coil periphery region surrounded by coil with the 2nd insulator is separated completely; Or
The width of described 2nd insulator is slightly larger than the just right width of adjacent two-layer conductor, and the width of the 2nd insulator slightly is greater than the twice that the just right width of adjacent two-layer internal electrode is no more than internal electrode width.
2. laminated power coil type device according to claim 1, it is characterized in that: described coil-conductor is provided with two groups and connects mutual intussusception, described conductor connects in order, is formed the spiral coil of the stack direction of insulator as two groups of mutual intussusceptions of axis; The part of insulating barrier folded by conductor is the magnetic material of low magnetic permeability or the 2nd insulator of nonmagnetic substance; Insulating barrier folded by described each layer conductor had both comprised the insulating barrier between same spiral coil conductor, also comprised the insulating barrier between two different spiral coil conductors.
3. laminated power coil type device according to claim 1, is characterized in that: the laminated body in the laminated body central area that coil surrounds by described 2nd insulator and coil periphery region is separated completely.
4. laminated power coil type device according to claim 1, is characterized in that: the magnetic permeability of described 2nd insulator is the magnetic permeability less than 1/5 of the 1st insulator.
5. laminated power coil type device according to claim 1, is characterized in that: described 1st insulator differs 1 × 10 with the 2nd insulator coefficient of linear expansion
-7/ DEG C below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210018817.2A CN102568778B (en) | 2012-01-20 | 2012-01-20 | Laminated power coil type device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210018817.2A CN102568778B (en) | 2012-01-20 | 2012-01-20 | Laminated power coil type device |
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| CN102568778A CN102568778A (en) | 2012-07-11 |
| CN102568778B true CN102568778B (en) | 2015-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210018817.2A Active CN102568778B (en) | 2012-01-20 | 2012-01-20 | Laminated power coil type device |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016125725A1 (en) * | 2015-02-02 | 2016-08-11 | 株式会社村田製作所 | Electric current detection element and electrical power transmission system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1282969A (en) * | 1999-08-03 | 2001-02-07 | 太阳诱电株式会社 | Laminated inductor |
| CN1906717A (en) * | 2005-01-07 | 2007-01-31 | 株式会社村田制作所 | Laminated coil |
| JP2010034171A (en) * | 2008-07-28 | 2010-02-12 | Panasonic Corp | Laminated coil |
| WO2011121828A1 (en) * | 2010-03-31 | 2011-10-06 | 株式会社村田製作所 | Electronic component and method for manufacturing same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5333461B2 (en) * | 2009-01-22 | 2013-11-06 | 株式会社村田製作所 | Multilayer inductor |
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2012
- 2012-01-20 CN CN201210018817.2A patent/CN102568778B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1282969A (en) * | 1999-08-03 | 2001-02-07 | 太阳诱电株式会社 | Laminated inductor |
| CN1906717A (en) * | 2005-01-07 | 2007-01-31 | 株式会社村田制作所 | Laminated coil |
| JP2010034171A (en) * | 2008-07-28 | 2010-02-12 | Panasonic Corp | Laminated coil |
| WO2011121828A1 (en) * | 2010-03-31 | 2011-10-06 | 株式会社村田製作所 | Electronic component and method for manufacturing same |
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Effective date of registration: 20210303 Address after: No. 301, Rong Le Dong Road, Songjiang District, Shanghai Patentee after: Shunluo (Shanghai) Electronics Co., Ltd Address before: Shenzhen City, Guangdong province Baoan District 518110 sightseeing road s Fuyuan sunlord Industrial Park Patentee before: Shenzhen Sunlord Electronics Co.,Ltd. |
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