CN101996736A - Common mode filter - Google Patents
Common mode filter Download PDFInfo
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- CN101996736A CN101996736A CN2009101095898A CN200910109589A CN101996736A CN 101996736 A CN101996736 A CN 101996736A CN 2009101095898 A CN2009101095898 A CN 2009101095898A CN 200910109589 A CN200910109589 A CN 200910109589A CN 101996736 A CN101996736 A CN 101996736A
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Abstract
The invention is applicable to the field of electronic elements and provides a common mode filter, which comprises a first insulation layer, a second insulation layer, a third insulation layer, a fourth insulation layer, a fifth insulation layer, a sixth insulation layer, a first medium layer, a second medium layer, a third medium layer, a fourth medium layer, a first conductor, a spiral second conductor, a spiral third conductor, a fourth conductor, a first lead-out electrode, a second lead-out electrode, a third lead-out electrode and a fourth lead-out electrode, wherein the first conductor and the second conductor form a first coil; the fourth conductor and the third conductor form a third coil; and the magnetic lines of force passing through the first and second coils are parallel to the ground. In the common mode filter of the invention, a medium layer made of a composite material is printed or cast between the first and second coils, so the coefficient of coupling between the electrodes increases; meanwhile, the magnetic lines of force are parallel to the ground, the parasitic capacitance is small, the resonant frequency is improves and the inhibition effect on common mode interference is desirable.
Description
Technical field
The invention belongs to the electronic devices and components field, relate in particular to a kind of common-mode filter.
Background technology
Fig. 1 shows the structure of the common-mode filter that prior art provides, and is to adopt the copline mode to be made, and the coupling coefficient in this common-mode filter between the electrode is little; In order to solve the little problem of coupling coefficient between the electrode, prior art has proposed a kind of common-mode filter that adopts accumulation mode up and down to be made, though in this common-mode filter between the electrode coupling coefficient big, yet because its magnetic line of force is perpendicular to ground, therefore parasitic capacitance is bigger, thereby causes self-resonant frequency lower.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of common-mode filter, and being intended to solve existing common-mode filter, to adopt planar fashion to make the coupling coefficient that causes between the electrode little and adopt up and down accumulation mode to make to cause the low problem of its self-resonant frequency.
The embodiment of the invention is achieved in that a kind of common-mode filter, and described common-mode filter comprises:
First insulating barrier, it has first surface and second surface;
First dielectric layer, it is arranged on the described first surface of described first insulating barrier;
Second insulating barrier, it has first surface and second surface; The described second surface of described second insulating barrier is arranged on described first dielectric layer;
First conductor, it is arranged on the described first surface of described second insulating barrier; Described first conductor has first terminal and second end;
Second dielectric layer, it is arranged on described first conductor;
The 3rd insulating barrier, it has first surface and second surface; The described second surface of described the 3rd insulating barrier is arranged on described second dielectric layer;
The second spiral-shaped conductor, it is arranged on the described first surface of described the 3rd insulating barrier; Described second conductor has first terminal and second end, described second end of described second conductor and described second terminal connection of described first conductor, described first conductor and described second conductor form first coil, and the magnetic line of force that passes described first coil is parallel to ground;
The 3rd dielectric layer is made by composite material, and described the 3rd dielectric layer is arranged on described second conductor;
The 4th insulating barrier, it has first surface and second surface; The described second surface of described the 4th insulating barrier is arranged on described the 3rd dielectric layer;
The 3rd spiral-shaped conductor, it is arranged on the described first surface of described the 4th insulating barrier; Described the 3rd conductor has first terminal and second end;
The 4th dielectric layer, it is arranged on described the 3rd conductor;
The 5th insulating barrier, it has first surface and second surface; The described second surface of described the 5th insulating barrier is arranged on described the 4th dielectric layer;
The 4th conductor, it is arranged on the described first surface of described the 5th insulating barrier; Described the 4th conductor has first terminal and second end; Described second end of described the 4th conductor and described second terminal connection of described the 3rd conductor, described the 4th conductor and described the 3rd conductor form second coil, and the magnetic line of force that passes described second coil is parallel to ground;
The 6th insulating barrier, it has first surface and second surface; The described second surface of described the 6th insulating barrier is arranged on described the 4th conductor;
First extraction electrode, it is connected with described first end of described first conductor;
Second extraction electrode, it is connected with described first end of described second conductor;
The 3rd extraction electrode, it is connected with described first end of described the 3rd conductor;
The 4th extraction electrode, it is connected with described first end of described the 4th conductor.
Wherein, described the 3rd dielectric layer is by Ferrite Material and ceramic material is compound or make by ferrite and resin compounded or by the composite material that ceramic material and resin compounded form.
Wherein, common-mode filter also comprises: the 5th dielectric layer, and it is arranged on described the 4th conductor, and the described second surface of described the 6th insulating barrier is arranged on described the 5th dielectric layer.
Wherein, described first dielectric layer, second dielectric layer and the 4th dielectric layer are made by Ferrite Material or ceramic material.
Wherein, described first insulating barrier, second insulating barrier, the 3rd insulating barrier, the 4th insulating barrier, the 5th insulating barrier and the 6th insulating barrier are made by Ferrite Material.
Wherein, described second end of described second conductor is connected by through hole with described second end of described first conductor; Described second end of described the 4th conductor is connected by through hole with described second end of described the 3rd conductor.
Wherein, described second end of described second conductor is connected with the described second terminal conductiving point that forms by the printing curtain coating of described first conductor; Described second end of described the 4th conductor is connected with the described second terminal conductiving point that forms by the printing curtain coating of described the 3rd conductor.
Wherein, described conductiving point is silver point or silver-colored palladium point.
The dielectric layer that the common-mode filter of the vertical structure that the embodiment of the invention provides prints between first coil and second coil or curtain coating one deck is made by composite material makes that the coupling coefficient between the electrode increases; Simultaneously, because its magnetic line of force is parallel to ground, parasitic capacitance is little, has improved self-resonant frequency, and is effective to the inhibition of common mode disturbances.
Description of drawings
Fig. 1 is the structure chart of the common-mode filter made of employing copline mode that prior art provides;
Fig. 2 is the decomposition texture schematic diagram of the common-mode filter that provides of the embodiment of the invention;
Fig. 3 is the perspective view of the common-mode filter that provides of the embodiment of the invention;
Fig. 4 is the equivalent circuit diagram of the common-mode filter that provides of the embodiment of the invention;
Fig. 5 is the impedance-frequency curve chart of the common-mode filter that provides of the embodiment of the invention;
Fig. 6 is its manufacture method flow chart of the common-mode filter that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The common-mode filter that the embodiment of the invention provides prints the dielectric layer that one deck is made by composite material between first coil and second coil, make that the coupling coefficient between the electrode increases; Simultaneously, because its magnetic line of force is parallel to ground, parasitic capacitance is little, has improved self-resonant frequency, and is effective to the inhibition of common mode disturbances.
The common-mode filter decomposition texture that the embodiment of the invention provides for convenience of explanation, only shows the part relevant with the embodiment of the invention as shown in Figure 2, and details are as follows.
Common-mode filter comprises: first insulating barrier 11, second insulating barrier 12, the 3rd insulating barrier 13, the 4th insulating barrier 14, the 5th insulating barrier 15, the 6th insulating barrier 16, first dielectric layer 21, second dielectric layer 22, the 3rd dielectric layer 23, the 4th dielectric layer 24, first conductor 31, the second spiral-shaped conductor 32, spiral-shaped the 3rd conductor 33, the 4th conductor 34, first extraction electrode 311, second extraction electrode 321, the 3rd extraction electrode 331 and the 4th extraction electrode 341; Wherein, first insulating barrier 11 has first surface and second surface; First dielectric layer 21 is arranged on the first surface of first insulating barrier 11; Second insulating barrier 12 has first surface and second surface, and the second surface of second insulating barrier 12 is arranged on first dielectric layer 21; First conductor 31 is arranged on the first surface of second insulating barrier 12, and first conductor 31 has first terminal and second end; Second dielectric layer 22 is arranged on first conductor 31; The 3rd insulating barrier 13 has first surface and second surface, and the second surface of the 3rd insulating barrier 13 is arranged on second dielectric layer 22; The second spiral-shaped conductor 32 is arranged on the first surface of the 3rd insulating barrier 13, second conductor 32 has first terminal and second end, second end 322 of second conductor 32 is connected with second terminal 312 of first conductor 31, first conductor 31 and second conductor 32 form first coil, and the magnetic line of force that passes described first coil is parallel to ground; The 3rd dielectric layer 23 is made by composite material, and the 3rd dielectric layer 23 is arranged on second conductor 32; The 4th insulating barrier 14, it has first surface and second surface, and the second surface of the 4th insulating barrier 14 is arranged on the 3rd dielectric layer 23; The 3rd spiral-shaped conductor 33 is arranged on the first surface of the 4th insulating barrier 14, and the 3rd conductor 33 has first terminal and second end; The 4th dielectric layer 24 is arranged on the 3rd conductor 33; The 5th insulating barrier 15 has first surface and second surface, and the second surface of the 5th insulating barrier 15 is arranged on the 4th dielectric layer 24; The 4th conductor 34 is arranged on the first surface of the 5th insulating barrier 15, and the 4th conductor 34 has first terminal and second end; Second end 342 of the 4th conductor 34 is connected with second terminal 332 of the 3rd conductor 33, and the 4th conductor 34 and the 3rd conductor 33 form second coil, and the magnetic line of force that passes described first coil is parallel to ground; The 6th insulating barrier 16 has first surface and second surface, and the second surface of the 6th insulating barrier 16 is arranged on the 4th conductor 34; First extraction electrode 311 is connected with first end of first conductor 31; Second extraction electrode 321 is connected with first end of second conductor 32; The 3rd extraction electrode 331 is connected with first end of the 3rd conductor 33; The 4th extraction electrode 341 is connected with first end of the 4th conductor 34.
In embodiments of the present invention, the 3rd dielectric layer 23 is made by composite material; Wherein, the 3rd dielectric layer 23 can be made by the composite material that Ferrite Material and ceramic material are composited, the 3rd dielectric layer 23 also can be made by the composite material that ferrite and resin compounded form, and the 3rd dielectric layer 23 can also be made by the composite material that ceramic material and resin compounded form.As one embodiment of the present of invention, can obtain the common-mode filter of different impedances by the composite material of configuration different proportion; Can adopt the ferrite of low-k, high magnetic permeability to obtain the common-mode filter of high impedance value.
In embodiments of the present invention, common-mode filter also comprises: the 5th dielectric layer 25, and it is arranged on the 4th conductor 34, and the second surface of the 6th insulating barrier 16 is arranged on the 5th dielectric layer 25.
As one embodiment of the present of invention, first dielectric layer 21, second dielectric layer 22, the 4th dielectric layer 24 and the 5th dielectric layer 25 are made by Ferrite Material or ceramic material.
In embodiments of the present invention, second terminal 322 of second conductor 32 can be connected by through hole with second end 312 of first conductor 31, and described second end 342 of the 4th conductor 34 can be connected by through hole with second end 332 of the 3rd conductor 33.In addition, second end 322 of second conductor 32 can also be connected by the conductiving point that the printing curtain coating forms with second end 312 of first conductor 31, and second end 342 of the 4th conductor 34 can also be connected by the conductiving point of printing curtain coating formation with second end 332 of the 3rd conductor 33.Wherein, conductiving point can be metal or alloy such as silver, silver-colored palladium.
Fig. 3 shows the stereochemical structure of the common-mode filter that the embodiment of the invention provides, 100 main bodys wherein for the back common-mode filter that is shaped, and four ends are extraction electrodes 311,321,331,341 respectively.
The equivalent electric circuit of the common-mode filter that the embodiment of the invention provides as shown in Figure 4, this common-mode filter is made of two inductance coil parallel connections, the magnetic line of force that passes inductance coil is parallel to ground; Adopt this common-mode filter can the attenuation common-mode noise, reach the purpose of filtering, suppress electromagnetic interference effectively.
In order to illustrate further the common-mode filter that the embodiment of the invention provides, Fig. 5 shows the impedance-frequency curve of common-mode filter, wherein impedance-the frequency curve of the common-mode filter that provides for the embodiment of the invention of curve I; Impedance-the frequency curve of the common-mode filter that curve II makes for the employing copline mode that prior art provides; The employing that curve III provides for prior art is the impedance-frequency curve of the common-mode filter made of accumulation mode up and down.
As can be seen from the figure, though the coupling coefficient between the common-mode filter electrode that accumulation mode is made about adopting is big, because its parasitic capacitance is bigger, so self-resonant frequency is lower; Though the coupling coefficient between the common-mode filter electrode that employing copline mode is made is little, but its parasitic capacitance is smaller, in order to reach certain mode impedance value, the differential mode impedance phase should be than higher, so self-resonant frequency is slightly high with respect to the common-mode filter that adopts accumulation mode up and down to make; The coupling coefficient that the present invention adopts vertical structure to make between the electrode of common-mode filter is big, because its magnetic line of force is parallel to ground, and the parasitic capacitance minimum, self-resonant frequency is the highest, and is best to the inhibition effect of common mode disturbances.
Fig. 6 shows its manufacture method flow process of the common-mode filter that the embodiment of the invention provides, for convenience of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Step 1: configuration slurry;
In embodiments of the present invention, first insulating barrier 11, second insulating barrier 12, the 3rd insulating barrier 13, the 4th insulating barrier 14, the 5th insulating barrier 15, the 6th insulating barrier 16 are made by Ni, the Zn of different proportion, the Ferrite Material that the Cu oxide is formed; First dielectric layer 21, second dielectric layer 22, the 4th dielectric layer 24, the 5th dielectric layer 25 can be made by ferrite, also can be made up of according to certain proportioning advanced low-k materials (silica, aluminium oxide, boron oxide); The 3rd dielectric layer 23 can carry out mixed material by a certain percentage by Ferrite Material and advanced low-k materials (perhaps ferrite+resin) and make.
As one embodiment of the present of invention, above-mentioned material is added that certain oil-based solvent carries out can obtaining needed slurry behind the ball milling.
Step 2: casting film-forming, undertaken the above-mentioned slurry that configures to form first insulating barrier 11 after the curtain coating by the waterfall The tape casting;
Step 3: print first extraction electrode 311, adopt method for printing screen, form first extraction electrode 311 by printed silver, silver-colored palladium or platinum slurry;
Step 4: the printing points electrode, promptly at the second terminal 312 printing conductives point of first conductor 31;
As one embodiment of the present of invention, can adopt method for printing screen, promptly by silver or silver-colored palladium metal slurry printing points electrode.
Step 5: curtain coating/printed medium film, promptly the mode by The tape casting or printing forms second dielectric layer 22;
In embodiments of the present invention, the curtain coating French adopts the mode of waterfall curtain coating to carry out curtain coating; And the printed medium film is to adopt the method for printing screen printing; When wherein adopting The tape casting, its slurry viscosity that needs is low; If adopt printing process, its slurry viscosity is far above the The tape casting slurry viscosity.
Step 6: electrode in the printing, promptly print second conductor 32;
Step 7: the printing points electrode, promptly at the second terminal 322 printing conductives point of second conductor 32; Be connected with second terminal 322 of second conductor 32 by second end 312 of point electrode, make win conductor 31 and second conductor, 32 formation, first coil first conductor 31;
Step 8: curtain coating/printed medium film forms the 3rd dielectric layer 23; With step 5;
Step 9: the printing points electrode, with step 7;
Step 10: exit in the printing, with step 3;
Step 11: casting film-forming, undertaken the above-mentioned slurry that configures to form the 6th insulating barrier 16 after the curtain coating by the waterfall The tape casting.
The dielectric layer that the common-mode filter of the vertical structure that the embodiment of the invention provides prints between first coil and second coil or curtain coating one deck is made by composite material makes that the coupling coefficient between the electrode increases; Simultaneously, because its magnetic line of force is parallel to ground, parasitic capacitance is little, has improved self-resonant frequency, and is effective to the inhibition of common mode disturbances.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a common-mode filter is characterized in that, described common-mode filter comprises:
First insulating barrier (11), it has first surface and second surface;
First dielectric layer (21), it is arranged on the described first surface of described first insulating barrier (11);
Second insulating barrier (12), it has first surface and second surface; The described second surface of described second insulating barrier (12) is arranged on described first dielectric layer (21);
First conductor (31), it is arranged on the described first surface of described second insulating barrier (12); Described first conductor (31) has first terminal and second end;
Second dielectric layer (22), it is arranged on described first conductor (31);
The 3rd insulating barrier (13), it has first surface and second surface; The described second surface of described the 3rd insulating barrier (13) is arranged on described second dielectric layer (22);
Spiral-shaped second conductor (32), it is arranged on the described first surface of described the 3rd insulating barrier (13); Described second conductor (32) has first terminal and second end, described second end (322) of described second conductor (32) is connected with described second end (312) of described first conductor (31), described first conductor (31) forms first coil with described second conductor (32), and the magnetic line of force that passes described first coil is parallel to ground;
The 3rd dielectric layer (23) is made by composite material, and described the 3rd dielectric layer (23) is arranged on described second conductor (32);
The 4th insulating barrier (14), it has first surface and second surface; The described second surface of described the 4th insulating barrier (14) is arranged on described the 3rd dielectric layer (23);
Spiral-shaped the 3rd conductor (33), it is arranged on the described first surface of described the 4th insulating barrier (14); Described the 3rd conductor (33) has first terminal and second end;
The 4th dielectric layer (24), it is arranged on described the 3rd conductor (33);
The 5th insulating barrier (15), it has first surface and second surface; The described second surface of described the 5th insulating barrier (15) is arranged on described the 4th dielectric layer (24);
The 4th conductor (34), it is arranged on the described first surface of described the 5th insulating barrier (15); Described the 4th conductor (34) has first terminal and second end; Described second end (342) of described the 4th conductor (34) is connected with described second end (332) of described the 3rd conductor (33), described the 4th conductor (34) forms second coil with described the 3rd conductor (33), and the magnetic line of force that passes described second coil is parallel to ground;
The 6th insulating barrier (16), it has first surface and second surface; The described second surface of described the 6th insulating barrier (16) is arranged on described the 4th conductor (34);
First extraction electrode (311), it is connected with described first end of described first conductor (31);
Second extraction electrode (321), it is connected with described first end of described second conductor (32);
The 3rd extraction electrode (331), it is connected with described first end of described the 3rd conductor (33);
The 4th extraction electrode (341), it is connected with described first end of described the 4th conductor (34).
2. common-mode filter as claimed in claim 1 is characterized in that, described the 3rd dielectric layer (23) is by Ferrite Material and ceramic material is compound or make by ferrite and resin compounded or by the composite material that ceramic material and resin compounded form.
3. common-mode filter as claimed in claim 1 is characterized in that, described common-mode filter also comprises:
The 5th dielectric layer (25), it is arranged on described the 4th conductor (34), and the described second surface of described the 6th insulating barrier (16) is arranged on described the 5th dielectric layer (25).
4. common-mode filter as claimed in claim 1 is characterized in that, described first dielectric layer (21), second dielectric layer (22) and the 4th dielectric layer (24) are made by Ferrite Material or ceramic material.
5. common-mode filter as claimed in claim 1, it is characterized in that described first insulating barrier (11), second insulating barrier (12), the 3rd insulating barrier (13), the 4th insulating barrier (14), the 5th insulating barrier (15) and the 6th insulating barrier (16) are made by Ferrite Material.
6. common-mode filter as claimed in claim 1 is characterized in that, described second end (322) of described second conductor (32) is connected by through hole with described second end (312) of described first conductor (31); Described second end (342) of described the 4th conductor (34) is connected by through hole with described second end (332) of described the 3rd conductor (33).
7. common-mode filter as claimed in claim 1 is characterized in that, described second end (322) of described second conductor (32) is connected by the conductiving point that the printing curtain coating forms with described second end (312) of described first conductor (31); Described second end (342) of described the 4th conductor (34) is connected by the conductiving point that the printing curtain coating forms with described second end (332) of described the 3rd conductor (33).
8. common-mode filter as claimed in claim 1 is characterized in that, described conductiving point is silver point or silver-colored palladium point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101095898A CN101996736A (en) | 2009-08-13 | 2009-08-13 | Common mode filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101095898A CN101996736A (en) | 2009-08-13 | 2009-08-13 | Common mode filter |
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| Publication Number | Publication Date |
|---|---|
| CN101996736A true CN101996736A (en) | 2011-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101095898A Pending CN101996736A (en) | 2009-08-13 | 2009-08-13 | Common mode filter |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014005311A1 (en) * | 2012-07-05 | 2014-01-09 | Laird Technologies (Shenzhen) Ltd. | Common mode filters |
| CN103680893A (en) * | 2013-12-20 | 2014-03-26 | 深圳振华富电子有限公司 | Multilayer chip inductor and manufacturing method thereof |
| CN104779034A (en) * | 2015-04-20 | 2015-07-15 | 禾邦电子（中国）有限公司 | Common-mode filter and manufacturing method thereof |
| CN112908606A (en) * | 2019-12-03 | 2021-06-04 | Tdk株式会社 | Coil component |
| CN113396538A (en) * | 2019-02-12 | 2021-09-14 | 马勒国际有限公司 | Filter module for reducing differential and common mode noise and method for manufacturing such a filter module |
-
2009
- 2009-08-13 CN CN2009101095898A patent/CN101996736A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014005311A1 (en) * | 2012-07-05 | 2014-01-09 | Laird Technologies (Shenzhen) Ltd. | Common mode filters |
| CN103680893A (en) * | 2013-12-20 | 2014-03-26 | 深圳振华富电子有限公司 | Multilayer chip inductor and manufacturing method thereof |
| CN103680893B (en) * | 2013-12-20 | 2016-04-06 | 深圳振华富电子有限公司 | Laminated chip inductor and manufacture method thereof |
| CN104779034A (en) * | 2015-04-20 | 2015-07-15 | 禾邦电子（中国）有限公司 | Common-mode filter and manufacturing method thereof |
| CN113396538A (en) * | 2019-02-12 | 2021-09-14 | 马勒国际有限公司 | Filter module for reducing differential and common mode noise and method for manufacturing such a filter module |
| CN113396538B (en) * | 2019-02-12 | 2022-07-05 | 马勒国际有限公司 | Filter module for reducing differential and common mode noise and method for manufacturing such a filter module |
| CN112908606A (en) * | 2019-12-03 | 2021-06-04 | Tdk株式会社 | Coil component |
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Application publication date: 20110330 |