CN1820331A - Common mode noise filter - Google Patents
Common mode noise filter Download PDFInfo
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- CN1820331A CN1820331A CN 200580000688 CN200580000688A CN1820331A CN 1820331 A CN1820331 A CN 1820331A CN 200580000688 CN200580000688 CN 200580000688 CN 200580000688 A CN200580000688 A CN 200580000688A CN 1820331 A CN1820331 A CN 1820331A
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Abstract
A common mode noise filter includes a first insulating layer made of magnetic material, a first conductor on the first insulating layer, a second insulating layer located on the first conductor and made of nonmagnetic material, a second conductor having a spiral shape on the second insulating layer and connected with the first conductor, a third insulating layer located on the second conductor and made of nonmagnetic material, a third conductor having a spiral shape provided on the third insulating layer, a fourth insulating layer located on the third conductor and made of nonmagnetic material, a fourth conductor connected with the third conductor, a fifth insulating layer provided on the fourth conductor and made of magnetic material. The first conductor and the second conductor provide a first coil. The third conductor and the fourth conductor provide a second coil. The third insulating layer is thicker than the second insulating layer and the fourth insulating layer. This filter can increase impedance of the first and second coils against common mode components.
Description
Technical field
The present invention relates to be used for the small size laminated type common-mode noise filter of various electronic equipments.
Background technology
Figure 16 is the decomposition diagram of the existing common-mode noise filter 1001 that openly disclosed in case 2000-190410 number of Japanese Patent Laid.Spirality conductor 2A, the 2B, 3A and the 3B that contain metal are arranged at insulating barrier 1A respectively to the upper surface of 1D.Conductor 2A and 2B interconnect via switching electrode 4A, thereby form coil 2.Conductor 3A and 3B interconnect via switching electrode 4B, thereby form coil 3.On the lower surface of insulating barrier 1A and on the upper surface of conductor 3B, be respectively arranged with the insulating barrier of making by magnetic material 5.Insulating barrier 1B is made by nonmagnetic substance to 1D.Insulating barrier 1A and insulating barrier 5 are made by magnetic material.Across (across) insulating barrier 1C and conductor 2B respect to one another and the mutual magnetic coupling of 3A.Such layout makes the common mode component of signal of coil 2 and 3 pairs of these coils of flowing through have big impedance, thereby eliminates the noise in the common mode component.
In common-mode noise filter 1001, if insulating barrier 1C is thinner, insulating barrier 1C may cause across insulating barrier 1C and between conductor 2B respect to one another and the 3A so, that is, and and the metal electro-migration between the failure of insulation between the coil 2 and 3 or conductor 2B and the 3A.If insulating barrier 1B and 1D are thicker, distance between insulating barrier 1A and the conductor 2B and conductor 3A and the distance that is arranged between the insulating barrier 5 on the upper surface of conductor 1D will be long so, thereby can't effectively utilize the magnetic field that is produced in insulating barrier 1A and the insulating barrier 5.Such layout possibly can't make coil 2 and 3 pairs of common mode components have big impedance.
Figure 17 is the decomposition diagram of the existing common-mode noise filter 1002 that disclosed in the open case of Japan special permission 2001-76930 number.Conductor 502A, 502B, 503A and 503B are arranged at insulating barrier 501A respectively to the upper surface of 501D.Conductor 502A and spirality conductor 502B interconnect by switching electrode 504A, thereby form coil 502.Conductor 503A and conductor 503B interconnect by switching electrode 504B, thereby form coil 503.The insulating barrier 501E that is made by magnetic material is formed on the upper surface of conductor 503B.Magnetic portion 505 is formed at the spiral-shaped inboard that the insulating barrier 501B to 501D that is made by nonmagnetic substance went up and be positioned at conductor 502B and 503A.
The common mode component of the signal of coil 502 and 503 pairs of these coils of flowing through has big impedance, thereby eliminates common-mode noise.Magnetic portion 505 has increased the magnetic field between the coil 502 and 503, and has increased the impedance of coil 502 and 503 pairs of common mode components, thereby further eliminates common-mode noise.
Existing common-mode noise filter 1002 comprises a plurality of magnetic portion 505, and wherein each magnetic portion 505 is arranged at the insulating barrier 501B that made by nonmagnetic substance respectively to 501D.By in 501D, forming the hole respectively at insulating barrier 501B, fill these holes with magnetic material cream, and the described paste of heat hardening, thereby form magnetic portion 505.In order to increase the size of magnetic portion 505, the hole that forms magnetic portion 505 need have than major diameter.Because paste is subject to capillary influence, the diameter that therefore increases the hole can make the volume of the amount of magnetic material cream less than the hole.So just may around magnetic portion 505, produce the space, and therefore reduce the magnetic field between coil 502 and 503, thereby hinder coil 502 and 503 pairs of common mode components to have big impedance.
Summary of the invention
Common-mode noise filter comprises: first insulating barrier, and it is made by magnetic material; First conductor, it is arranged on described first insulating barrier; Second insulating barrier, it is arranged on described first conductor and by nonmagnetic substance and makes; The second spiral-shaped conductor, it is positioned on described second insulating barrier and with described first conductor and is connected; The 3rd insulating barrier, it is positioned on described second conductor and by nonmagnetic substance makes; The 3rd spiral-shaped conductor, it is arranged on described the 3rd insulating barrier; The 4th insulating barrier, it is positioned on described the 3rd conductor and by nonmagnetic substance makes; The 4th conductor, it is connected with described the 3rd conductor second end; The 5th insulating barrier, it is arranged on described the 4th conductor and by magnetic material and makes.Described first and second conductors form first coil.Described third and fourth conductor forms second coil.Described the 3rd insulating barrier is than described second insulating barrier and described the 4th insulating layer thickness.
This filter can increase described first and described second coil to the impedance of common mode component.
Description of drawings
Fig. 1 is the decomposition diagram according to the common-mode noise filter of exemplary embodiments 1 of the present invention.
Fig. 2 is the stereogram according to the common-mode noise filter of embodiment 1.
Fig. 3 is the decomposition diagram according to another common-mode noise filter of embodiment 1.
Fig. 4 is the decomposition diagram according to the another common-mode noise filter of embodiment 1.
Fig. 5 shows according to the relation between the coupling coefficient between the thickness of insulating layer of the common-mode noise filter of embodiment 1 and coil.
Fig. 6 shows according to the thickness of insulating layer of the common-mode noise filter of embodiment 1 and the relation between the failure of insulation incidence.
Fig. 7 is the decomposition diagram according to the common-mode noise filter of exemplary embodiments 2 of the present invention.
Fig. 8 is the stereogram according to the common-mode noise filter of embodiment 2.
Fig. 9 is the stereogram according to the essential part of another common-mode noise filter of embodiment 2.
Figure 10 is the stereogram according to the essential part of the another common-mode noise filter of embodiment 2.
Figure 11 is the stereogram according to the essential part of the another common-mode noise filter of embodiment 2.
Figure 12 is the decomposition diagram according to the another common-mode noise filter of embodiment 2.
Figure 13 is the decomposition diagram according to the common-mode noise filter of exemplary embodiments 3 of the present invention.
Figure 14 is the decomposition diagram according to the common-mode noise filter of exemplary embodiments 4 of the present invention.
Figure 15 shows according to the relation between the coupling coefficient between the thickness of insulating layer of the common-mode noise filter of embodiment 2 and coil.
Figure 16 is the decomposition diagram of an existing common-mode noise filter.
Figure 17 is the decomposition diagram of another existing common-mode noise filter.
Reference numeral
11 insulating barriers (first insulating barrier)
12 conductors (first conductor)
13 insulating barriers (second insulating barrier)
14 conductors (second conductor)
15 insulating barriers (the 3rd insulating barrier)
16 conductors (the 3rd conductor)
17 insulating barriers (the 4th insulating barrier)
18 conductors (the 4th conductor)
19 insulating barriers (the 5th insulating barrier)
20 coils (first coil)
21 coils (second coil)
22 lead-in wire electrodes (the first lead-in wire electrode)
24 lead-in wire electrodes (the second lead-in wire electrode)
25 lead-in wire electrodes (the 3rd lead-in wire electrode)
27 lead-in wire electrodes (the 4th lead-in wire electrode)
34 magnetic portions
118 conductors (the 4th conductor)
511 insulating barriers (first insulating barrier)
512 conductors (first conductor)
513 insulating barriers (second insulating barrier)
514 conductors (second conductor)
515 insulating barriers (the 3rd insulating barrier)
516 conductors (the 3rd conductor)
517 insulating barriers (the 4th insulating barrier)
518 conductors (the 4th conductor)
519 insulating barriers (the 5th insulating barrier)
520 coils (first coil)
521 coils (second coil)
522 magnetic portions
523 lead-in wire electrodes (the first lead-in wire electrode)
525 lead-in wire electrodes (the second lead-in wire electrode)
526 lead-in wire electrodes (the 3rd lead-in wire electrode)
528 lead-in wire electrodes (the 4th lead-in wire electrode)
5518 conductors (the 4th conductor)
Embodiment
Exemplary embodiments 1
Fig. 1 is the decomposition diagram according to the common-mode noise filter 101 of exemplary embodiments 1 of the present invention.Common-mode noise filter 101 comprises: be arranged at the conductor 12 on the upper surface 11A of insulating barrier 11, be arranged at the insulating barrier 13 on the upper surface 22A of conductor 12, be arranged at the spirality conductor 14 on the upper surface 13A of insulating barrier 13, be arranged at the insulating barrier 15 on the upper surface 14C of conductor 14, be arranged at the spirality conductor 16 on the upper surface 15A of insulating barrier 15, be arranged at the insulating barrier 17 on the upper surface 16C of conductor 16, be arranged at the conductor 18 on the upper surface 17A of insulating barrier 17, with the insulating barrier 19 on the upper surface 18C that is arranged at conductor 18.Therefore, the lower surface 13B of insulating barrier 13 is positioned on the upper surface 12C of conductor 12.The lower surface 15B of insulating barrier 15 is positioned on the upper surface 14C of conductor 14.The lower surface 17B of insulating barrier 17 is positioned on the upper surface 16C of conductor 16.The lower surface 19B of insulating barrier 19 is positioned on the upper surface 18C of conductor 18.
Insulating barrier 11 and 19 is made by magnetic material, and insulating barrier 13,15 and 17 is made by nonmagnetic substance.Insulating barrier 15 is thicker than insulating barrier 13 and 17.Insulating barrier 11 is by magnetic material, for example, and based on Fe
2O
3Ferrite, make and for laminar, it has insulation characterisitic.
Insulating barrier 13 is by nonmagnetic substance, such as Cu-Zn ferrite or glass ceramics, and makes and for laminar, it has insulation characterisitic.Switching electrode 23 is arranged at the center of insulating barrier 13, and is penetrated into lower surface 13B from the upper surface 13A of insulating barrier 13.The other end 12A of switching electrode 23 and conductor 12 is connected.
Insulating barrier 15 is by nonmagnetic substance, such as Cu-Zn ferrite or glass ceramics, and makes and for laminar, it has insulation characterisitic.Insulating barrier 15 is thicker than insulating barrier 13 and 17.
Insulating barrier 17 is by nonmagnetic substance, such as Cu-Zn ferrite or glass ceramics, and makes and for laminar, it has insulation characterisitic.Switching electrode 26 is arranged at the center of insulating barrier 17, and is penetrated into lower surface 17B from the upper surface 17A of insulating barrier 17.The other end 16A of switching electrode 26 and conductor 16 is connected.Terminal 16A is positioned at the spiral-shaped of conductor 16.
Owing to the major part of conductor 16 is faced conductor 14 across insulating barrier 15, conductor 16 and conductor 14 have the magnetic force influence, thereby make coil 20 and coil 21 magnetic couplings.This coupling makes the common mode component of electric current (signal) of coil 20 and 21 pairs of these coils of flowing through have big impedance.Spirality conductor 14 and 16 has increased the impedance of coil 20 and 21. Switching electrode 23 and 26 is respectively by place electric conducting material in the hole that penetrates insulating barrier 13 and 17, such as silver, and forms.
Insulating barrier 19 is by magnetic material, such as based on Fe
2O
3Ferrite, and make and for laminar, it has insulation characterisitic.
Can make by nonmagnetic substance by the insulating barrier 13,15 and 17 that nonmagnetic substance is made based on ferrite series.Make it possible to thus insulating barrier 13,15 and 17 and, thereby all insulating barriers are combined securely and stable filter 101 by the insulating barrier of making based on ferritic magnetic material 11 and 19 sintering simultaneously.
The lower surface 11B that laminar dummy dielectric layer (dummy insulating layer) 28A and 28B are arranged at insulating barrier 11 respectively go up and the upper surface 19A of insulating barrier 19 on. Dummy dielectric layer 28A and 28B have insulation characterisitic, and can be made by magnetic material or nonmagnetic substance.Insulating barrier 11,13,15,17 and 19 quantity and the quantity of dummy dielectric layer 28A and 28B are not limited to quantity shown in Figure 1.
Fig. 2 is the stereogram of common-mode noise filter 101.Above-mentioned insulating barrier, dummy dielectric layer, conductor, lead-in wire electrode and switching electrode form noise filter main body 29.Outer electrode 31 and 32 is arranged on the side 29A of noise filter main body 29, and outer electrode 30 and 33 is arranged on the side 29B of main body 29.Outer electrode 30,31,32 is connected with 27 with lead-in wire electrode 22,24,25 respectively with 33.
As mentioned above, the conductor 14 and 16 that influences each other by magnetic force is spiral-shaped, and therefore the part of magnetic force influence is longer each other.Form coil 20 and 21 and the conductor 12,14,16 and 18 that produces magnetic field be arranged on the insulating barrier of making by nonmagnetic substance 13,15 and 17, therefore reduce the leakage of magnetic flux.This effect has increased the magnetic coupling between the coil 20 and 21, and makes effectively to utilize and run through the insulating barrier 11 made by magnetic material and 19 magnetic field, thereby increases the impedance to the common mode component of the electric current of flowing through coil 20 and 21.
As long as the shape of conductor 12 and 18 can not reduce the impedance to common mode component, its shape is just unrestricted so.As shown in Figure 1, conductor 12 and 18 is a rectilinear form, rather than spiral-shaped as conductor 14 and 16.Therefore, filter has less impedance to differential mode (differential) component, and correspondingly common mode component is had big impedance.
Lead-in wire electrode 22,24,25 preferably can such as silver, and be made by the electric conducting material identical with 18 with conductor 12,14,16 with 27, forms simultaneously with conductor 12,14,16 and 18. Conductor 12,14,16 and 18 and lead-in wire electrode 22,24,25 and 27 can be by forming such as printing or vapour deposition rather than electric plating method.
Fig. 3 is the decomposition diagram according to another common-mode noise filter 102 of embodiment 1.Filter 102 comprises the magnetic portion 34 of being made by magnetic material, and it is formed on the insulating barrier 15 and is positioned at the spiral-shaped of conductor 14 and 16.Magnetic portion 34 is positioned at the penetralia 14D and the 16D of spirality conductor 14 and 16, and does not contact conductor 14 and 16.Magnetic portion 34 increases between the conductor 14 and 16, that is, and and the magnetic field between the coil 20 and 21 that is magnetically coupling to one another, thereby the impedance that increases coil 20 and 21 pairs of common mode components.If insulating barrier 15 is thicker, the distance between the coil 20 and 21 can be far away so, so that can increase magnetic portion 34 effective magnetic couplings that increase between the coil 20 and 21 in the magnetic field between coil 20 and 21.Magnetic portion 34 and switching electrode 23 and 26 are made by mutually different material, and it is arranged on the different insulating barriers, therefore are easy to form.Magnetic portion 34 can be replaced by a plurality of magnetic portion, and wherein each magnetic portion is positioned on the position identical with magnetic portion 34, and has the structure identical with magnetic portion 34.
Fig. 4 is the decomposition diagram according to the another common-mode noise filter 103 of embodiment 1.Switching electrode 126 is arranged in the insulating barrier 13, corresponding to the position of switching electrode 26 set in the insulating barrier 15, and and the electrode 26 of transferring be connected.Replace conductor 18 as shown in Figure 1, the conductor 118 with the terminal 118A that is connected with switching electrode 126 is arranged on the upper surface 11A of insulating barrier 11.The terminal 118B of conductor 118 is connected with lead-in wire electrode 127.Lead-in wire electrode 127 is exposed on the side 11C of the insulating barrier 11 that exposed of lead-in wire electrode 22.Lead-in wire electrode 22 and 27 is positioned at similar face, promptly on the upper surface 11A of insulating barrier 11, and therefore can be magnetically coupling to one another.Such layout has increased the magnetic coupling between the coil 20 and 21, thereby has increased the impedance of coil to common mode component.
Lead-in wire electrode 22,24,25 and 27 width can be greater than the width of conductor 12,14,16 and 18.Such layout has reduced those does not have the magnetic effect of the part of contribution to the magnetic coupling between coil 20 and 21, thereby increases the impedance of coil to common mode component.
Then, manufacture method according to the common-mode noise filter 101 of embodiment 1 illustrated in figures 1 and 2 hereinafter will be described.
At first, the rectangle insulating barrier 11,13,15,17 and 19 and dummy dielectric layer 28A and 28B for preparing predetermined quantity with the mixture of the material powder of resin and magnetic material or nonmagnetic substance.Insulating barrier 15 is thicker than insulating barrier 13 and 17.Form the hole by laser, punching press or other method precalculated position in insulating barrier 13 and 17, and use electric conducting material,, fill these holes, thereby form switching electrode 23 and 26 such as silver.
Then, insulating barrier 11 is placed on the dummy dielectric layer 28A.Then, on the upper surface 11A of insulating barrier 11, form conductor 12 and lead-in wire electrode 22 by plating.Then, the insulating barrier 13 that wherein has switching electrode 23 is placed on the upper surface 12C of conductor 12.At this moment, the other end 12A of conductor 12 is connected with switching electrode 23.Then, on the upper surface 13A of insulating barrier 13, form spirality conductor 14 and lead-in wire electrode 24 by plating.At this moment, the other end 14A of conductor 14 is connected with switching electrode 23.Then, insulating barrier 15 is placed on the upper surface 14C of conductor 14.Then, on the upper surface 15A of insulating barrier 15, form spirality conductor 16 and lead-in wire electrode 25 by plating.Then, the insulating barrier 17 that wherein has switching electrode 26 is placed on the upper surface 16A of conductor 16.At this moment, the other end 16A of conductor 16 is connected with switching electrode 26.Then, on the upper surface 17A of insulating barrier 17, form conductor 18 and lead-in wire electrode 27 by plating.At this moment, the other end 18A of conductor 18 is connected with switching electrode 26.Conductor 12,14,16 and 18 is to form by the conductor with predetermined pattern that forms by plating go up to be set at ready made substrate (not shown) and these conductors are transferred on the insulating barrier.Then, insulating barrier 19 is placed on the upper surface 18A of conductor 18.Then, dummy dielectric layer 28B is placed on the upper surface 19A of insulating barrier 19, thereby form noise filter main body 29.
In order to improve manufacturing efficient, can on big insulating barrier wafer, form many group conductors 12,14,16 and 18, but follow cut crystal, with a plurality of noise filter main bodys 29 of disposable formation.
Then, sintering noise filter main body 29 in the following scheduled time of predetermined temperature.
Then, brush silver on the side of noise filter main body 29 29A and 29B, thus form respectively the outer electrode 30,31,32 and 33 that is connected with 27 with lead-in wire electrode 22,24,25.
At last, with outer electrode 30,31,32 and 33 nickel plating, so that nickel coating to be set, and further electroplate metal thereon, so that form low-melting metal level such as tin or scolder.
In the common-mode noise filter 101 to 103 according to embodiment 1, insulating barrier 15 is thicker than insulating barrier 13 and 17, thereby prevents across insulating barrier 15 and between conductor respect to one another 14 and 16, that is, and and failure of insulation between the coil 2 and 3 and migration.Insulating barrier 13 and 17 can be thinner, thereby make distance and the distance between insulating barrier 19 and the conductor 16 between insulating barrier 11 and the conductor 14 shorter.Such layout makes can effectively utilize the magnetic field that is produced in the insulating barrier of being made by magnetic material 11 and 19, thereby makes coil 20 and 21 pairs of common mode components have big impedance.
Fig. 5 shows according to the relation between the thickness of the insulating barrier 13 of the common-mode noise filter 101 of embodiment 1 and 15 and coil 20 and 21 s' the coupling coefficient.Make a plurality of common-mode noise filter samples, it has structure as shown in Figure 1 separately, and comprises that separately thickness is the insulating barrier 15 of 24 μ m.Coupling coefficient is big more, and the impedance of coil 20 and 21 pairs of common mode components is also just big more.It is substandard products that coupling coefficient is not more than that 0.94 sample is considered as.
As shown in Figure 5, in order to obtain coupling coefficient, need the thickness of insulating barrier 13 and 17 to be not more than 20 μ m greater than 0.94.Thickness surpasses insulating barrier 13 and 17 magnetic fields that can't effectively utilize in the insulating barrier of being made by magnetic material 11 and 19 of 20 μ m.
Insulating barrier 13 and 17 minimum thickness can determine according to desirable characteristics, and consider and can be preferably the needs of operation, for example, is not less than 5 μ m.Even the thickness of insulating barrier 13 failure of insulation can not occur less than 20 μ m yet, has same potential because be arranged at the upper surface and the conductor on the lower surface 12 and 14 of insulating barrier 13 respectively.Similarly, even the thickness of insulating barrier 17 failure of insulation can not occur less than 20 μ m yet, has same potential because be arranged at the upper surface and the conductor on the lower surface 16 and 18 of insulating barrier 17 respectively.
Fig. 6 shows according to the thickness of the insulating barrier 15 of the common-mode noise filter of embodiment 1 and the relation between the failure of insulation speed.Make a plurality of common-mode noise filter samples, it has structure as shown in Figure 1 separately, and comprises that separately thickness is the insulating barrier 13 and 17 of 17 μ m.Will be under the condition of 125 ℃ of ambient temperatures, 85% humidity, 2atm pressure, when being continuously applied the voltage of 5V between coil 20 and 21, the insulation resistance that is represented between coil 20 and 21 is not more than 10
7It is substandard products that the sample of Ω is considered as.Sample S1, S2 and S3 comprise that thickness is respectively the insulating barrier 15 of 17 μ m, 20 μ m and 24 μ m.
As shown in Figure 6, after 36 hours, observe failure of insulation among the sample S1, and also do not observe failure of insulation among sample S2 and the S3 even after 60 hours.These results represent that the thickness of insulating barrier 15 preferably is not less than 20 μ m.Thickness has increased the possibility of failure of insulation between the conductor 14 and 16 and migration less than the insulating barrier 15 of 20 μ m.
The maximum ga(u)ge of insulating barrier 15 can determine according to the required characteristic of filter, and considers the magnetic coupling between coil 20 and 21 and thickness or other condition of filter main body 29, can be preferably (for example) and be not more than 100 μ m.
All comprise single coil 20 and single coil 21 according to each filter in the common-mode noise filter 101 to 103 of embodiment 1, yet also can comprise a plurality of coils 20 and a plurality of coil 21 of array type.
Exemplary embodiments 2
Fig. 7 is the decomposition diagram according to the common-mode noise filter 1501 of exemplary embodiments 2 of the present invention.Common-mode noise filter 1501 comprises the conductor 512 on the upper surface 511A that is arranged at insulating barrier 511, be arranged at the insulating barrier 513 on the upper surface 512C of conductor 512, be arranged at the spirality conductor 514 on the upper surface 513A of insulating barrier 513, be arranged at the insulating barrier 515 on the upper surface 514C of conductor 514, be arranged at the spirality conductor 516 on the upper surface 515A of insulating barrier 515, be arranged at the insulating barrier 517 on the upper surface 516C of conductor 516, be arranged at the conductor 518 on the upper surface 517A of insulating barrier 517, with the insulating barrier 519 on the upper surface 518C that is arranged at conductor 518.Conductor 518 is connected with conductor 512, and conductor 518 is connected with conductor 516.More particularly, the lower surface 513B of insulating barrier 513 is positioned on the upper surface 512C of conductor 512.The lower surface 515B of insulating barrier 515 is positioned on the upper surface 514C of conductor 514.The lower surface 517B of insulating barrier 517 is positioned on the upper surface 516C of conductor 516.The lower surface 519B of insulating barrier 519 is positioned on the upper surface 518C of conductor 518.Conductor 512 and 514 forms coil 520, and conductor 516 and 518 forms coil 521.Insulating barrier 511 and 519 is made by magnetic material, and insulating barrier 513,515 and 517 is made by nonmagnetic substance.Insulating barrier 515 has a plurality of magnetic portion 522, and these magnetic portions 522 are made by magnetic material, and are positioned at the spiral-shaped of conductor 514 and 516.
Insulating barrier 511 is by magnetic material, such as based on Fe
2O
3Ferrite, make and for laminar, it has insulation characterisitic.
Insulating barrier 513 is by nonmagnetic substance, such as Cu-Zn ferrite or glass ceramics, and makes and for laminar, it has insulation characterisitic, and places on the upper surface 512C of conductor 512.Switching electrode 524 is arranged at the center of insulating barrier 513, and is penetrated into lower surface 513B from upper surface 513A.The other end 512A of switching electrode 524 and conductor 512 is connected.
Insulating barrier 515 is by nonmagnetic substance, such as Cu-Zn ferrite or glass ceramics, and makes and for laminar, it has insulation characterisitic, and places on the upper surface 514A of conductor 514.
Four magnetic portions 522 of being made by magnetic material are arranged at the central area of insulating barrier 515 and are positioned at the spiral-shaped inboard of conductor 514 and 516.Magnetic portion 522 is by with magnetic material, such as based on Fe
2O
3Ferrite, put into the hole that penetrates insulating barrier 515 and form.Magnetic portion 522 lays respectively in the penetralia 514D and 516D of spirality conductor 514 and 516, and does not contact conductor 514 and 516.
The quantity of magnetic portion 522 is not limited to four, and magnetic portion 522 not necessarily will penetrate insulating barrier 515.Magnetic portion 522 can be by making with insulating barrier 511 identical materials, thereby can low-costly make filter 1501.Magnetic portion 522 and the switching electrode 524 and 527 made by different materials are not to be arranged on the single insulating barrier, therefore are easy to form.
Insulating barrier 517 is by nonmagnetic substance, such as Cu-Zn ferrite or glass ceramics, makes and for laminar, it has insulation characterisitic, and places on the upper surface 516C of conductor 516.Switching electrode 527 is formed at the center of insulating barrier 517, and is penetrated into lower surface 517B from the upper surface 517A of insulating barrier 517.The other end 516A of switching electrode 527 and conductor 516 is connected.Other end 516A is positioned at the spiral-shaped inboard of conductor 516.
Insulating barrier 515 is thicker than insulating barrier 513 and 517.
Insulating barrier 519 is by magnetic material, such as based on Fe
2O
3Ferrite, make and for laminar, it has insulation characterisitic, and places on the upper surface 518C of conductor 518.
Insulating barrier 513,515 and 517 can be by making based on ferritic nonmagnetic substance.Make it possible to thus insulating barrier 513,515 and 517 and, thereby insulating barrier is combined securely and stable filter 1501 by the insulating barrier of making based on ferritic magnetic material 511 and 519 sintering simultaneously.
The lower surface 511B that dummy dielectric layer 529A and 529B are arranged at insulating barrier 511 respectively go up and the upper surface 519A of insulating barrier 519 on. Dummy dielectric layer 529A and 529B are laminar, and it has insulation characterisitic, and can be made by magnetic material or nonmagnetic substance.Insulating barrier 5151,513,515,517 and 519 and the quantity of dummy dielectric layer 529A and 529B be not limited to as shown in Figure 7 quantity.
Fig. 8 is the stereogram of common-mode noise filter 1501.Above-mentioned insulating barrier, conductor, lead-in wire electrode and dummy dielectric layer form noise filter main body 530.Outer electrode 531,532,533 and 534 is arranged on the side 530A and 530B of noise filter main body 530.Outer electrode 531,532,533 is connected with 528 with lead-in wire electrode 523,525,526 respectively with 534.
The conductor 514 and 516 of magnetic force influence has spiral-shapedly each other, and therefore the part of magnetic force influence is longer mutually.The feasible magnetic field that can effectively utilize between the insulating barrier of making by magnetic material 511 and 519 of such layout, thus make coil 520 and 521 pairs of common mode components have big impedance.
As long as the shape of conductor 512 and 518 can not reduce the impedance to common mode component, its shape does not just have specific limited so.As shown in Figure 7, conductor 512 and 518 is a rectilinear form, rather than spiral-shaped as conductor 514 and 516.These shapes reduce the impedance of filter to the differential-mode component of the electric current of flowing through coil 520 and 521, and correspondingly increase the impedance to common mode component.
Lead-in wire electrode 523,525,526 can such as silver, and form, thereby can form simultaneously with conductor 512,514,516 and 518 by plating and conductor 512,514,516 electric conducting material identical with 518 with 528.Conductor 512,514,516 and 518 and the lead-in wire electrode 523,525,526 and 528 can form by method such as printing or vapour deposition rather than plating.
Then, the method for making according to the common-mode noise filter 1501 of embodiment 2 hereinafter will be described.
At first, the rectangle insulating barrier 511,513,515,517 and 519 and dummy dielectric layer 529A and 529B for preparing predetermined quantity with the mixture of the material powder of resin and magnetic material or nonmagnetic substance.Form the hole by laser, punching press or other method precalculated position in insulating barrier 513 and 517, and fill these holes, thereby form switching electrode 524 and 527 respectively with silver.In the central area of insulating barrier 515, form a plurality of holes, and fill these holes, thereby form a plurality of magnetic portion 522 with magnetic material cream.
Then, insulating barrier 511 is placed on the dummy dielectric layer 529A.On the upper surface 511A of insulating barrier 511, form conductor 512 and lead-in wire electrode 523 by plating.Then, the insulating barrier 513 that wherein has switching electrode 524 is placed on the upper surface 512C of conductor 512.At this moment, the other end 512A of conductor 512 is connected with switching electrode 524.Then, on the upper surface 513A of insulating barrier 513, form spirality conductor 514 and lead-in wire electrode 525 by plating.At this moment, the other end 514A of conductor 514 is connected with switching electrode 524.Then, the insulating barrier 515 that wherein has magnetic portion 522 is placed on the upper surface 514C of conductor 514.Then, on the upper surface 515A of insulating barrier 515, form spirality conductor 516 and lead-in wire electrode 526 by plating.At this moment, magnetic portion 522 is positioned at the penetralia 514D and the 516D of the spiral-shaped inboard of conductor 514 and 516.Then, the insulating barrier 517 that wherein has switching electrode 527 is placed on the upper surface 516C of conductor 516.At this moment, the other end 516A of conductor 516 is connected with switching electrode 527.Then, go up formation conductor 518 and lead-in wire electrode 528 by the upper surface 517A that is plated on insulating barrier 517.At this moment, the other end 518A of conductor 518 is connected with switching electrode 527.
Conductor 512,514,516 and 518 is to form by the conductor with predetermined pattern that forms by plating being provided on ready made substrate (not shown) and these conductors being transferred on the insulating barrier.
Then, insulating barrier 519 is placed on the upper surface 518C of conductor 518.Then, dummy dielectric layer 529B is placed on the upper surface 519A of insulating barrier 519, thereby form noise filter main body 530.
In order to enhance productivity, can on an insulating barrier wafer, form many group conductors 512,514,516 and 518, then can cut this wafer, with a plurality of noise filter main bodys 530 of disposable formation.
Then, sintering noise filter main body 530 in the following scheduled time of predetermined temperature.
Then, brush silver on the side of noise filter main body 530 530A and 530B, thus form respectively the outer electrode 531,532,533 and 534 that is connected with 528 with lead-in wire electrode 523,525,526.
Then,, thereby form nickel coating thereon, and then plate metal, thereby form low-melting metal level such as tin or scolder with outer electrode 531,532,533 and 534 nickel plating.
Common-mode noise filter 1501 according to embodiment 2 comprises a plurality of magnetic portions 522 of being made by magnetic material, and it is positioned on the part of insulating barrier 515 of spiral-shaped inboard of conductor 514 and 516.The hole that such layout allows to be used to be provided with magnetic portion 522 has than minor diameter, so that surface tension can not have too big influence to magnetic material cream when magnetic material cream is inserted the hole.Therefore, the amount of magnetic material is identical substantially with the volume in hole, thereby can not produce the space around magnetic portion 522.This effect has increased the magnetic field between the coil 520 and 521, thereby makes the common mode component of the electric current of coil 520 and the 521 pairs of flowing through coil 520 and 521 have big impedance.In addition, can around magnetic portion 522, not produce the space, therefore can prevent to break.
The magnetic portion 522 of being made by magnetic material is arranged on the insulating barrier 515, insulating barrier 515 between coil 520 and 521, that is, and between the conductor 514 and 516 that is magnetically coupling to one another, can increase the magnetic field between coil 520 and 521 thus, thereby increase the impedance of coil 520 and 521 pairs of common mode components.
Fig. 9 is the stereogram according to the insulating barrier 5515 of another common-mode noise filter of embodiment 2.This filter comprises insulating barrier 5515, with the insulating barrier 515 of place of filters 1501.The other end 5516A of spirality conductor 5516 inboards is positioned at the upper surface 5515A of insulating barrier 5515.Other end 5516A is surrounded by a plurality of magnetic portion 522.Magnetic portion 522 such layouts allow spiral-shaped the inner of conductor 5516 to prolong, and therefore, the conductor part that faces with each other across insulating barrier 5515 can influence by magnetic force in big area, thereby increase the impedance to common mode component.
Figure 10 is the stereogram according to the insulating barrier 515 of the another common-mode noise filter of embodiment 2.This filter also comprises the 522A of magnetic portion of the spiral-shaped outside that is arranged at conductor 514 and 516 except comprising magnetic portion 522.The 522A of magnetic portion is positioned at outside the spiral-shaped most external 561E of conductor 516, promptly is positioned at the periphery place of insulating barrier 515.Such layout has not only also increased magnetic field between the two at coil 520 and 521 inner whiles in its outside, thereby further increases the impedance of coil to common mode component.As shown in figure 10, the 522A of magnetic portion is formed on four sides of insulating barrier 515, and comes out from insulating barrier 515.Yet the 522A of magnetic portion can be arranged on all four sides, perhaps can come out from insulating barrier 515.But the 522A of magnetic portion also adjoining land forms and encirclement conductor 516.
Figure 11 is the stereogram according to the insulating barrier 6515 of the another common-mode noise filter of embodiment 2.This filter comprises insulating barrier 6515, with the insulating barrier 515 of place of filters 1501.Contact the part of conductor 514 and 516 respectively by the 522B of magnetic portion that makes of insulation magnetic material.Such structure allows the magnetic 522B of portion to have than large tracts of land, therefore further increases the impedance to common mode component.
Figure 12 is the decomposition diagram according to the another common-mode noise filter 1502 of embodiment 2.In filter 1502, the 522C of magnetic portion is formed on the insulating barrier 517.The 522C of magnetic portion can be connected with the magnetic portion 522 on being formed at insulating barrier 515 or not be connected.Magnetic portion 522 and 522C have further increased the magnetic field between the coil 520 and 521, thereby increase the impedance to common mode component.The 522C of magnetic portion is formed on the insulating barrier 517 in the filter 1502.Another magnetic portion can be formed on the insulating barrier 513, and perhaps same magnetic part is not formed at insulating barrier 513 and 517 on the two.
Exemplary embodiments 3
Figure 13 is the decomposition diagram according to the common-mode noise filter 1503 of exemplary embodiments 3 of the present invention.The part identical with embodiment 2 represented by identical Reference numeral, and no longer described.
Filter 1503 comprises the lead-in wire electrode 5528 on the upper surface 511A that is arranged at insulating barrier 511, and with the lead-in wire electrode 528 shown in the alternate figures 7, the upper surface 511A of wherein described insulating barrier 511 is provided with lead-in wire electrode 523.Switching electrode 527A and 527B are arranged at respectively on insulating barrier 513 and 515.Conductor 5518 and lead-in wire electrode 5528 are arranged on the upper surface 511A of insulating barrier 511.Switching electrode 527A and 527B link together the other end 516A and the conductor 5518 of conductor 516.In filter 1502, because lead-in wire electrode 523 and 5528 is formed at similar face, that is, on the upper surface 511A, the electrode 523 and 5528 that therefore goes between is magnetically coupling to one another.Such layout has increased the magnetic coupling between the coil 520 and 521, thereby has increased the impedance of coil to common mode component.
Lead-in wire electrode 523,525,526 and 5528 width can be greater than the width of conductor 512,514,516 and 518.Such layout has reduced those does not have the conductor 512,514,516 of contribution and the magnetic effect on 518 parts to the magnetic coupling between coil 520 and 521.Therefore, have only conductor 514 and 516 to be magnetically coupling to one another, thereby further increase impedance common mode component.
Exemplary embodiments 4
Figure 14 is the decomposition diagram according to the common-mode noise filter 1504 of exemplary embodiments 4 of the present invention.The part identical with embodiment shown in Figure 72 represented by identical Reference numeral, and no longer described.
In filter 1504, insulating barrier 513 and 517 thickness are not more than 20 μ m.These thickness have shortened distance between insulating barrier 511 and the conductor 514 and the distance between insulating barrier 519 and the conductor 516.Such layout makes can effectively utilize the magnetic field that is produced in the insulating barrier of being made by magnetic material 511 and 519, thereby makes the common mode component of the electric current of coil 520 and 521 pairs of these coils of flowing through have big impedance.Insulating barrier 515 has the 522E of magnetic portion that is made by magnetic material.Insulating barrier 515 can have a plurality of magnetic portions as shown in Figure 7 to replace the magnetic 522E of portion.
Figure 15 shows according to the relation between the thickness of the insulating barrier 513 of the common-mode noise filter 1504 of embodiment 4 and 517 and coil 520 and 521 s' the coupling coefficient.Make a plurality of common-mode noise filter samples, it has structure as shown in Figure 7 separately, and comprises that separately thickness is the insulating barrier 515 of 26 μ m.Coupling coefficient is big more, and the impedance of coil 520 and 521 pairs of common mode components is also just big more.It is substandard products that coupling coefficient is not more than that 0.96 sample is considered as.
As shown in figure 15, in order to obtain the coupling coefficient greater than 0.96, insulating barrier 513 and 517 thickness must be not more than 20 μ m.The insulating barrier 513 and 517 that thickness surpasses 20 μ m can't effectively utilize the magnetic field that connects between the insulating barrier of being made by magnetic material 511 and 519.Contained insulating barrier 513 and 517 thickness are not more than the sample of 20 μ m, even insulating barrier 515 is thicker, still show bigger coupling coefficient, and the coupling coefficient of the sample of its coupling coefficient insulating barrier 515 less with having thickness is identical substantially.
Insulating barrier 513 and 517 minimum thickness can determine according to desirable characteristics, and consider its operation, can be preferably (for example) and be not less than 5 μ m.
Because insulating barrier 515 is thicker than insulating barrier 513 and 517, thus insulating barrier 515 can prevent between between the conductor 514 and 516 of insulating barrier 515, that is, and failure of insulation between the coil 520 and 521 or migration.Because insulating barrier 513 and 517 can be thinner, so the distance between distance between insulating barrier 511 and the conductor 514 and insulating barrier 519 and the conductor 516 can be shorter, thereby make and effectively to utilize the magnetic field that is produced in the insulating barrier of making by magnetic material 511 and 519.This effect has increased the impedance of coil 520 and 521 pairs of common mode components.
All comprise single coil 20 and single coil 21 according to each filter in the common-mode noise filter 1501 to 1504 of embodiment 2 to 4, yet also can comprise a plurality of coils 520 and a plurality of coil 521 of array type.
Industrial applicability
Common-mode noise filter according to the present invention prevents failure of insulation and the migration between the coil, and makes line Circle has big impedance to common mode component.
Claims (16)
1. common-mode noise filter, it comprises:
First insulating barrier, it has upper surface and lower surface, and described first insulating barrier is made by magnetic material;
First conductor, it is arranged on the described upper surface of described first insulating barrier;
Second insulating barrier, it has upper surface and lower surface, and the described lower surface of described second insulating barrier is positioned on described first conductor, and described second insulating barrier is made by nonmagnetic substance;
The second spiral-shaped conductor, it is arranged on the described upper surface of described second insulating barrier, described second conductor has first terminal and second end, and described second end of described second conductor is connected with described first conductor, and described first conductor and described second conductor form first coil;
The 3rd insulating barrier, it has upper surface and lower surface, and the described lower surface of described the 3rd insulating barrier is positioned on described second conductor, and described the 3rd insulating barrier is made by nonmagnetic substance;
The 3rd spiral-shaped conductor, it is arranged on the described upper surface of described the 3rd insulating barrier, and described the 3rd conductor has first terminal and second end, and described the 3rd conductor is faced described second conductor across described the 3rd insulating barrier;
The 4th insulating barrier, it has upper surface and lower surface, and the described lower surface of described the 4th insulating barrier is positioned on described the 3rd conductor, and described the 4th insulating barrier is made by nonmagnetic substance;
The 4th conductor, described second end of itself and described the 3rd conductor is connected, and described the 3rd conductor and described the 4th conductor form second coil;
The 5th insulating barrier, it is arranged on the described upper surface of described the 4th conductor, and described the 5th insulating barrier is made by magnetic material;
The first lead-in wire electrode, it is connected with described first conductor;
The second lead-in wire electrode, described first end of itself and described second conductor is connected;
The 3rd lead-in wire electrode, described first end of itself and described the 3rd conductor is connected; With
The 4th lead-in wire electrode, it is connected with described the 4th conductor,
Wherein said the 3rd insulating barrier is than described second insulating barrier and described the 4th insulating layer thickness.
2. common-mode noise filter according to claim 1, wherein said the 4th conductor is arranged on the described upper surface of described the 4th insulating barrier.
3. common-mode noise filter according to claim 1, the thickness of wherein said the 3rd insulating barrier are not less than 20 μ m, and the thickness of described second insulating barrier and described the 4th insulating barrier is not more than 20 μ m.
4. common-mode noise filter according to claim 1, it also comprises the magnetic portion that described the 3rd insulating barrier is made by magnetic material that is arranged in, and described magnetic portion is positioned at the described spiral-shaped inboard of described second conductor and the described spiral-shaped inboard of described the 3rd conductor.
5. common-mode noise filter according to claim 1, it also comprises a plurality of magnetic portion that described the 3rd insulating barrier is made by magnetic material that is arranged in, and described magnetic portion is positioned at the described spiral-shaped inboard of described second conductor and the described spiral-shaped inboard of described the 3rd conductor.
6. common-mode noise filter according to claim 1, wherein
Described the 4th conductor is arranged on the described upper surface of described first insulating barrier,
Described first insulating barrier has the side, and
Described first lead-in wire electrode and described the 4th lead-in wire electrode expose from the described side of described first insulating barrier.
7. common-mode noise filter according to claim 1, the wherein said first lead-in wire electrode arrives the width of described the 4th conductor greater than described first conductor to the width of described the 4th lead-in wire electrode.
8. common-mode noise filter according to claim 1, the width of wherein said first conductor and described the 4th conductor is greater than the width of described second conductor and described the 3rd conductor.
9. common-mode noise filter, it comprises:
First insulating barrier, it has upper surface and lower surface, and described first insulating barrier is made by magnetic material;
First conductor, it is arranged on the described upper surface of described first insulating barrier;
Second insulating barrier, it has upper surface and lower surface, and the described lower surface of described second insulating barrier is positioned on described first conductor, and described second insulating barrier is made by nonmagnetic substance;
The second spiral-shaped conductor, it is arranged on the described upper surface of described second insulating barrier, described second conductor has first terminal and second end, and described second end of described second conductor is connected with described first conductor, and described first conductor and described second conductor form first coil;
The 3rd insulating barrier, it has upper surface and lower surface, and the described lower surface of described the 3rd insulating barrier is positioned on described second conductor, and described the 3rd insulating barrier is made by nonmagnetic substance;
The 3rd spiral-shaped conductor, it is arranged on the described upper surface of described the 3rd insulating barrier, and described the 3rd conductor has first terminal and second end, and described the 3rd conductor is faced described second conductor across described the 3rd insulating barrier;
The 4th insulating barrier, it has upper surface and lower surface, and the described lower surface of described the 4th insulating barrier is positioned on described the 3rd conductor, and described the 4th insulating barrier is made by nonmagnetic substance;
The 4th conductor, described second end of itself and described the 3rd conductor is connected, and described the 3rd conductor and described the 4th conductor form second coil;
The 5th insulating barrier, it is arranged on the described upper surface of described the 4th conductor, and described the 5th insulating barrier is made by magnetic material;
A plurality of magnetic portions of making by magnetic material, it is arranged in described the 3rd insulating barrier, and described a plurality of magnetic portion is positioned at the described spiral-shaped inboard of described second conductor and the described spiral-shaped inboard of described the 3rd conductor;
The first lead-in wire electrode, it is connected with described first conductor;
The second lead-in wire electrode, described first end of itself and described second conductor is connected;
The 3rd lead-in wire electrode, described first end of itself and described the 3rd conductor is connected; With
The 4th lead-in wire electrode, it is connected with described the 4th conductor.
10. common-mode noise filter according to claim 9, wherein said the 4th conductor is arranged on the described upper surface of described the 4th insulating barrier.
11. common-mode noise filter according to claim 9, the thickness of wherein said the 3rd insulating barrier are not less than 20 μ m, and the thickness of described second insulating barrier and described the 4th insulating barrier is not more than 20 μ m.
12. common-mode noise filter according to claim 9, wherein,
Described the 4th conductor is arranged on the described upper surface of described first insulating barrier,
Described first insulating barrier has the side, and
Described first lead-in wire electrode and described the 4th lead-in wire electrode expose from the described side of described first insulating barrier.
13. common-mode noise filter according to claim 9, the wherein said first lead-in wire electrode arrives the width of described the 4th conductor greater than described first conductor to the width of described the 4th lead-in wire electrode.
14. common-mode noise filter according to claim 9, the width of wherein said first conductor and described the 4th conductor is greater than the width of described second conductor and described the 3rd conductor.
15. common-mode noise filter, it comprises:
First insulating barrier, it has upper surface and lower surface, and described first insulating barrier is made by magnetic material;
First conductor, it is arranged on the described upper surface of described first insulating barrier;
Second insulating barrier, it has upper surface and lower surface, and the described lower surface of described second insulating barrier is positioned on described first conductor, and described second insulating barrier is made by nonmagnetic substance, and the thickness of described second insulating barrier is not more than 20 μ m;
The second spiral-shaped conductor, it is arranged on the described upper surface of described second insulating barrier, described second conductor has first terminal and second end, and described second end of described second conductor is connected with described first conductor, and described first conductor and described second conductor form first coil;
The 3rd insulating barrier, it has upper surface and lower surface, and the described lower surface of described the 3rd insulating barrier is positioned on described second conductor, and described the 3rd insulating barrier is made by nonmagnetic substance;
The 3rd spiral-shaped conductor, it is arranged on the described upper surface of described the 3rd insulating barrier, and described the 3rd conductor has first terminal and second end, and described the 3rd conductor is faced described second conductor across described the 3rd insulating barrier;
The 4th insulating barrier, it has upper surface and lower surface, and the described lower surface of described the 4th insulating barrier is positioned on described the 3rd conductor, and described the 4th insulating barrier is made by nonmagnetic substance, and the thickness of described the 4th insulating barrier is not more than 20 μ m;
The 4th conductor, described second end of itself and described the 3rd conductor is connected, and described the 3rd conductor and described the 4th conductor form second coil;
The 5th insulating barrier, it is arranged on the described upper surface of described the 4th conductor, and described the 5th insulating barrier is made by magnetic material;
By the magnetic portion that magnetic material is made, it is arranged in described the 3rd insulating barrier, and described magnetic portion is positioned at the described spiral-shaped inboard of described second conductor and the described spiral-shaped inboard of described the 3rd conductor;
The first lead-in wire electrode, it is connected with described first conductor;
The second lead-in wire electrode, described first end of itself and described second conductor is connected;
The 3rd lead-in wire electrode, described first end of itself and described the 3rd conductor is connected; With
The 4th lead-in wire electrode, it is connected with described the 4th conductor.
16. common-mode noise filter according to claim 15, wherein said the 3rd insulating barrier is than described second insulating barrier and described the 4th insulating layer thickness.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004159142A JP4626185B2 (en) | 2004-05-28 | 2004-05-28 | Common mode noise filter |
| JP159142/2004 | 2004-05-28 | ||
| JP159143/2004 | 2004-05-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1820331A true CN1820331A (en) | 2006-08-16 |
| CN100559521C CN100559521C (en) | 2009-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800006882A Active CN100559521C (en) | 2004-05-28 | 2005-05-24 | Common-mode noise filter |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4626185B2 (en) |
| CN (1) | CN100559521C (en) |
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Also Published As
| Publication number | Publication date |
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| JP2005340611A (en) | 2005-12-08 |
| CN100559521C (en) | 2009-11-11 |
| JP4626185B2 (en) | 2011-02-02 |
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