CN108231359A - Common-mode filter - Google Patents
Common-mode filter Download PDFInfo
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- CN108231359A CN108231359A CN201710522119.9A CN201710522119A CN108231359A CN 108231359 A CN108231359 A CN 108231359A CN 201710522119 A CN201710522119 A CN 201710522119A CN 108231359 A CN108231359 A CN 108231359A
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- electrode pattern
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- mode filter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/323—Insulation between winding turns, between winding layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/324—Insulation between coil and core, between different winding sections, around the coil; Other insulation structures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
The present invention discloses a kind of common-mode filter.Common-mode filter includes：Main body includes filtering part；First to fourth external electrode is arranged in the outside of main body；First coil is arranged in filtering part, and comprising spiral first electrode pattern, both ends are electrically connected to the first external electrode and the second external electrode；Second coil, is arranged in filtering part, and including spiral second electrode pattern, both ends are electrically connected to third external electrode and the 4th external electrode；And insulating layer, it is arranged in a manner of surrounding first electrode pattern and second electrode pattern in filtering part, is formed with groove in position corresponding with the central portion of first electrode pattern and second electrode pattern, wherein insulating layer includes：Inside ampleness portion is defined within the region of the inside of part that the most inner side in first electrode pattern and second electrode pattern is arranged；And outside ampleness portion, it is defined within the region in the outside of part that the outermost in first electrode pattern and second electrode pattern is arranged.
Description
Technical field
The present invention relates to a kind of common-mode filters.
Background technology
As technology develops, the electronic equipments such as portable phone, household appliances, PC, PDA, LCD from analog form gradually to
Digital form changes, and handled data volume increases, therefore in the trend in high speed.Accordingly, it is passed as high speed signal
Defeated interface, USB 2.0, USB 3.0 and high-definition multimedia interface (high-definition multimedia
interface；HDMI it) is widely used, and these interfaces are nowadays in personal computer and digital high-definition television etc
It is used in numerous digital devices.
These high-speed interfaces are different from unit/terminal (single-end) usually used for a long time and send system, use
A kind of differential signal system that differential signal (difference modes signal) is sent using a pair of of signal wire.However, digitlization and height
The electronic equipment of speedization often occurs the signal as caused by high-frequency noise and loses to showing sensitive from extraneous stimulation
Very.
The reason of as this abnormal voltage and noise, including：Switching voltage, the supply voltage occurred in circuit is wrapped
Power supply noise, unnecessary electromagnetic signal or electromagnetic noise for containing etc..As for preventing such abnormal voltage and high frequency
Noise is flowed into the means of circuit, uses common-mode filter (Common Mode Filter；CMF).
In order to improve the impedance capacity of common-mode filter as described above, formed using a kind of central portion in multiple coils
Groove, so as to fill the scheme of ferrite lamellae.It is still to need a kind of energy at present however, even with scheme as described above
Enough further improve the truth of the technical solution of impedance capacity.
[existing technical literature]
[patent document]
(patent document 1) Korean Patent Laid the 2014-0107800th
Invention content
As an object of the present invention, it is desirable to provide a kind of common mode filtering with the structure that can improve impedance capacity
Device.
As technique for solving these problems scheme, the present invention proposes a kind of new structure by one embodiment
Common-mode filter, specifically, including：Main body includes filtering part；First external electrode, the second external electrode, third external electrical
Pole and the 4th external electrode are arranged in the outside of the main body；First coil is arranged in the filtering part, comprising spiral
First electrode pattern, both ends are electrically connected to first external electrode and the second external electrode；Second coil is arranged in described
Filtering part, including spiral second electrode pattern, both ends are electrically connected to the third external electrode and the 4th external electrode；
And insulating layer, arranged in a manner of surrounding the first electrode pattern and second electrode pattern in the filtering part, and with
The corresponding position of central portion of the first electrode pattern and second electrode pattern is formed with groove, wherein, the insulating layer packet
It includes：Inside ampleness portion is defined as the portion of the most inner side being located in the first electrode pattern and second electrode pattern arrangement
The region for the inside divided；And outside ampleness portion, it is defined as being located in the first electrode pattern and second electrode pattern
Outermost arrangement part outside region, wherein, by the line width of the first electrode pattern and second electrode pattern
It is set as W, and the width in the inside ampleness portion is set as D1, it is full when the width in the outside ampleness portion is set as D2
Sufficient D1+D2<4W.
As technique for solving these problems scheme, the present invention proposes a kind of new structure by another embodiment
Common-mode filter, specifically, including：Main body includes filtering part；First external electrode, the second external electrode, third external electrical
Pole and the 4th external electrode are arranged in the outside of the main body；First coil is arranged in the filtering part, comprising spiral
First electrode pattern and second electrode pattern, both ends are electrically connected to first external electrode and the second external electrode；Second
Coil is arranged in the filtering part, and comprising spiral third electrode pattern and the 4th electrode pattern, both ends are electrically connected to institute
State third external electrode and the 4th external electrode；And insulating layer, in the filtering part to surround the first electrode pattern,
The mode of two electrode patterns, third electrode pattern and the 4th electrode pattern arranges, and with the first electrode pattern, the second electricity
The corresponding position of central portion of pole figure case, third electrode pattern and the 4th electrode pattern is formed with groove, wherein, the insulating layer
Including：Inside ampleness portion is defined as being located in the first electrode pattern, second electrode pattern, third electrode pattern and the
The region of the inside of the part of most inner side arrangement in four electrode patterns；And outside ampleness portion, it is defined as being located at described
Outside the part of outermost arrangement in first electrode pattern, second electrode pattern, third electrode pattern and the 4th electrode pattern
The region of side, wherein, by the first electrode pattern, second electrode pattern, third electrode pattern and the 4th electrode pattern
Line width is set as W, and the width in the inside ampleness portion is set as D1, and the width in the outside ampleness portion is set as D2
When, meet D1+D2<4W.
For common-mode filter according to an embodiment of the invention, when the line the electrode pattern of composition coil
Width is set as W, and the width in the inside ampleness portion for being arranged to the insulating layer for surrounding electrode pattern is set as D1, by outside ampleness
When the width in portion is set as D2, meet D1+D2<4W, therefore the impedance capacity of common-mode filter can be significantly improved.
Description of the drawings
Fig. 1 schematically shows the stereogram of common-mode filter according to an embodiment of the invention.
Fig. 2 schematically shows the sectional view of the I-I ' of Fig. 1.
Fig. 3 schematically shows the stereogram of common-mode filter according to another embodiment of the present invention.
Fig. 4 schematically shows the sectional view of the II-II ' of Fig. 3.
Symbol description
100：Common-mode filter 101：Main body
110：Lower cover 120：Filtering part
121、122：First electrode pattern, second electrode pattern
130：Upper cover 140：Insulating layer
141：Coil part 142：Inside ampleness portion
143：Outside ampleness portion
Specific embodiment
Hereinafter, refer to the attached drawing and the preferred embodiment of the present invention is illustrated.
However, the embodiment of the present invention can be deformed into various other forms, the scope of the invention is not limited to following theorys
Bright embodiment.
Also, offer the embodiment of the present invention is intended to the present invention being described more fully flat to having in the art
The personnel of equal knowledge.
In the accompanying drawings, form and dimension for illustrating all elements etc. may be exaggerated for explanation definitely.
It moreover, will for the identical composition of the function in the identical thought range occurred in the attached drawing of each embodiment
Element is illustrated using identical reference numeral.
Fig. 1 schematically shows the stereogram of common-mode filter 100 according to an embodiment of the invention, Fig. 2 signals
The sectional view of the I-I ' of Fig. 1 is shown to property.
With reference to figure 1 and Fig. 2, the structure of common-mode filter 100 according to an embodiment of the invention is illustrated.
Common-mode filter 100 according to an embodiment of the invention includes：Main body 101；Multiple external electrodes 151,
152nd, 153,154, it is arranged in the outside of main body.
External electrode 151,152,153,154 may include the first external electrode 151, the second external electrode 152, outside third
153 and the 4th external electrode 154 of electrode, and according to demand, can also include playing the role of the external electrode of grounding electrode.
As shown in Figure 1, external electrode 151,152,153,154 can have the form for the side for being arranged in main body 101, however
It is not limited thereto, it is possible to have the lower surface electrode shape arranged on the surface provided in the attachment face as main body 101
State.
External electrode 151,152,153,154 can be formed as follows：In the outside of main body 101, printing includes conductive
The conductive paste of grain, and metal deposition is performed at an upper portion thereof.
Conductive particle can by silver-colored (Ag), palladium (Pd), aluminium (Al), nickel (Ni), titanium (Ti), golden (Au), copper (Cu), platinum (Pt) or
The formation such as their alloy of person, however be not limited thereto.
Main body 101 includes lower cover 110, filtering part 120 and upper cover 130.
Lower cover 110 may include magnetic material, such as can be ferrite substrate or magnetic resin composite material.It is magnetic
The composite material that magnetic material is distributed to macromolecule resin and manufactured by resin composite materials expression, can profit as magnetic material
With pure iron, ferrite etc..
Filtering part 120 is disposed on the top of lower cover 110.
Filtering part 120 includes first coil and the second coil.
The both ends of first coil are electrically coupleable to the first external electrode 151 and the second external electrode 152, the second coil
Both ends are electrically coupleable to 153 and the 4th external electrode 154 of third external electrode.
First coil and the second coil can have the shape that spiral electrode pattern is wound along the same direction.
Due to the shape that first coil and the second coil are wound with electrode pattern along the same direction, work as signal stream
When crossing first coil and the second coil, for common-mode signal, first coil and the second coil can act as impedance and perform and subtract
The effect of small common-mode noise.
First coil includes spiral first electrode pattern 121, and the second coil includes spiral second electrode pattern
122。
First electrode pattern 121 and second electrode pattern 122 are arranged to spiral form, and it is tall and erect to include electric conductivity
Metal more and formed, for example, can be by silver-colored (Ag), palladium (Pd), aluminium (Al), nickel (Ni), titanium (Ti), golden (Au), copper (Cu), platinum
(Pt) or the formation such as its alloy.
It the both ends of first coil can be by the lead electrode that is connect with first electrode pattern 121 and to main body 101
Outside exposes, and is electrically connected to the first external electrode 151 and the second external electrode 152.Moreover, the both ends of the second coil can be with
It is exposed by the lead electrode connected with second electrode pattern 122 to the outside of main body 101, and be electrically connected to third external electrical
153 and the 4th external electrode 154 of pole.
The medial end of first electrode pattern 121 and the medial end of second electrode pattern 122 can respectively pass through conduction
Property via and an electrode in external electrode is electrically connected to by the lead electrode for the layer for being formed in another height.
Insulating layer 140 is disposed with around first electrode pattern 121 and second electrode pattern 122.
Insulating layer 140 can gather film (ABF by the way that aginomoto is laminated：Ajinomoto build-up films) accumulation
Film is cured by using polyimides, epoxy resin, benzocyclobutene (BCB, Benzocyclobutene) etc.
Mode formed.
The central portion of insulating layer 140 is to include at the position corresponding to the central portion of electrode pattern 121,122 along thickness side
To the groove 125 through insulating layer 140.Groove 125 can pass through laser punching (laser punching) or mechanical hole-punching method
It is formed.
Magnetic substance can be filled in groove 125 and form core 126.
In the method that magnetic substance is filled in groove 125, ferrite lamellae can be laminated and be compacted at least the one of insulating layer
A surface utilizes magnetic resin composite material.
Magnetic resin composite material refers to the composite material manufactured by the way that magnetic material is distributed to macromolecule resin, makees
For magnetic materials such as magnetic material available iron ferritic, pure iron.
When filling magnetic resin composite material in groove 125, the magnetic susceptibility of groove 125 can be according to included in magnetic substance
The content of magnetic material in resin composite materials and it is adjusted.
Insulating layer 140 includes：Coil part 141 is disposed with spiral electrode pattern 121,122；Inside ampleness portion 142,
It is arranged in the inside of coil part 141；Outside ampleness portion 143 is arranged in the outside of coil part 141.
That is, inside ampleness portion 142 is defined as：In insulating layer 140, positioned in 121 and second electricity of first electrode pattern
The region of the inside of the part of most inner side arrangement in pole figure case 122；Outside ampleness portion 143 is defined as：In insulating layer 140
In, positioned at the region in the outside of the part of the outermost arrangement in first electrode pattern 121 and second electrode pattern 122.
The central portion of insulating layer 140 be disposed with groove 125 filled by magnetic substance and the core 126 that is formed, in insulating layer
140 outside is disposed with the side cap 127 comprising magnetic substance.
The available magnetic substance identical with core 126 of side cap 127 and formed, however be not limited thereto.
For example, core 126, and the shape using magnetic resin composite material can be formed by being laminated, being compacted ferrite lamellae
Into side cap 127, however it is not limited thereto.
Due to being disposed with the core 126 comprising magnetic substance in the central portion of insulating layer 140, and around insulating layer 140
The side cap 127 for including magnetic substance is disposed with, so forming closed magnetic circuit around coil, therefore one according to the present invention
The common-mode filter 100 of embodiment can have high impedance capacity.
However, it is necessary to further improve the impedance capacity of common-mode filter 100.
In order to further improve the impedance capacity of common-mode filter 100, for according to an embodiment of the invention common
For mode filter 100, when the line width of first electrode pattern 121 and second electrode pattern 122 is set as W, inside ampleness
The width in portion 142 is set as D1, when the width in outside ampleness portion 142 is set as D2, meets D1+D2<4W.
[table 1]
| Sample | Condition | Zcm(Ω) |
| Comparative example | D1+D2≥4W | 39 |
| Embodiment 1 | D1+D2<4W | 41 |
| Embodiment 2 | D1+D2<3W | 46 |
| Embodiment 3 | D1+D2<2W | 51 |
| Embodiment 4 | D1+D2<1W | 59 |
With reference to above-mentioned table 1, the following fact can be confirmed：Such as comparative example 1, in the case of D1+D2 >=4W, common-mode filter
Capacity Zcm for 39 Ω, 40 Ω are also not achieved.However, for common-mode filter according to an embodiment of the invention
For 100, it can be confirmed：Due to meeting D1+D2<4W, so the higher Zcm values with 40 more than Ω.
That is, for common-mode filter 100 according to an embodiment of the invention, due to meeting D1+D2<4W, institute
Common-mode filter 100 can be increased by the volume of magnetic substance that the central portion and surrounding for increasing insulating layer 140 are arranged
Impedance capacity.
As long as the thickness in inside ampleness portion 142 and outside ampleness portion 143, which reaches, is able to maintain that the exhausted of electrode pattern 121,122
The degree of edge is with regard to enough.
For example, it is also possible to be formed as D1 more than D2.When being formed as D1 more than D2, for the sky of the formation of side cap 127
Between can obtain sufficient increase.
That is, as the space formed for side cap 127 is increased, when side cap 127 forms magnetic substance,
The effect that impedance capacity with common-mode filter 100 significantly rises.
Different from this, D2 can also be formed as more than D1.When being formed as D2 more than D1, for the space of the formation of core 126
It can obtain sufficient increase.
That is, as the space formed for core 126 is increased, when forming magnetic substance in core 126, there is common mode filter
The effect that the impedance capacity of wave device 100 significantly rises.
Upper cover 130 can be disposed on the top of filtering part 120.
Upper cover may include magnetic material, for example, can be laminated ferrite lamellae material either magnetic resin it is compound
Material.Magnetic substance resin composite body refers to the composite material that magnetic material is distributed to macromolecule resin and is manufactured, as magnetism
Material can utilize pure iron, ferrite etc..
Fig. 3 schematically shows the stereogram of common-mode filter 200 according to an embodiment of the invention, and Fig. 4 is schematically
The sectional view of the II-II ' of Fig. 3 is shown.
With reference to figure 3 and Fig. 4, the structure of common-mode filter 200 according to another embodiment of the present invention is illustrated.
Common-mode filter 200 according to another embodiment of the present invention includes：Main body 201；Multiple external electrodes 251,
252nd, 253,254, it is arranged in the outside of main body 201.
External electrode 251,252,253,254 may include the first external electrode 251, the second external electrode 252, outside third
253 and the 4th external electrode 254 of electrode, and can further comprise playing the role of the external electrical of grounding electrode according to demand
Pole.
As shown in figure 3, external electrode 251,252,253,254 can have the form for the side for being arranged in main body 201, however
It is not limited thereto, it is possible to have the lower surface electrode shape arranged on the surface provided in the attachment face as main body 201
State.
External electrode 251,252,253,254 can be formed as follows：In the outside of main body 201, printing includes conductive
The conductive paste of grain, and metal deposition is performed at an upper portion thereof.
Conductive particle can by silver-colored (Ag), palladium (Pd), aluminium (Al), nickel (Ni), titanium (Ti), golden (Au), copper (Cu), platinum (Pt) or
The formation such as their alloy of person, however be not limited thereto.
Main body 201 includes lower cover 210, filtering part 220 and upper cover 230.
Lower cover 210 may include magnetic material, such as can be ferrite substrate or magnetic resin composite material.It is magnetic
The composite material that magnetic material is distributed to macromolecule resin and manufactured by resin composite materials expression, can profit as magnetic material
With pure iron, ferrite etc..
Filtering part 220 is disposed on the top of lower cover 210.
Filtering part 220 includes first coil and the second coil.
Two ends of first coil are electrically coupleable to the first external electrode 251 and the second external electrode 252, the second coil
Two ends be electrically coupleable to 253 and the 4th external electrode 254 of third external electrode.
First coil and the second coil can have the shape that spiral electrode pattern is wound along the same direction.
Due to the shape that first coil and the second coil are wound with electrode pattern along the same direction, work as signal stream
When crossing first coil and the second coil, for common-mode signal, first coil and the second coil can act as impedance and perform and subtract
The effect of small common-mode noise.
First coil includes spiral first electrode pattern 221 and second electrode pattern 222, and the second coil includes spiral
223 and the 4th electrode pattern 224 of third electrode pattern of shape.
First electrode pattern 221,224 cloth of second electrode pattern 222, third electrode pattern 223 and the 4th electrode pattern
Be set to spiral form, and the metal that electric conductivity brilliance can be included and formed, for example, can be by silver (Ag), palladium (Pd), aluminium
(Al), the formation such as nickel (Ni), titanium (Ti), gold (Au), copper (Cu), platinum (Pt) or its alloy.
It the both ends of first coil can be by drawing respectively with what first electrode pattern 221 and second electrode pattern 222 were connect
Line electrode and to main body 201 outside expose, so as to be electrically connected to the first external electrode 251 and the second external electrode 252.
First electrode pattern 221 and the medial end of second electrode pattern 222 can be electrically connected to each other by electric conductivity via.
Also, the both ends of the second coil with 223 and the 4th electrode pattern 224 of third electrode pattern by respectively connecting
Lead electrode and to main body 201 outside expose, so as to be electrically coupleable to 253 and the 4th external electrode 254 of third external electrode.
The medial end of 223 and the 4th electrode pattern 224 of third electrode pattern can be electrically connected to each other by electric conductivity via.
Different from this, first electrode pattern 221 and third electrode pattern 223 can alternate arrangement in one layer, the
Two electrode patterns 222 and the 4th electrode pattern 224 can alternate arrangement in another layer.In this case, common mode is filtered
The section along II-II ' of wave device is rendered as being similar to section shown in Fig. 2.
First electrode pattern 221, second electrode pattern 222, third electrode pattern 223 and the 4th electrode pattern 224
Surrounding is disposed with insulating layer 240.
Insulating layer 240 can gather film (ABF by the way that aginomoto is laminated：Ajinomoto build-up films) accumulation
Film is cured by using polyimides, epoxy resin, benzocyclobutene (BCB, Benzocyclobutene) etc.
Mode formed.
The central portion of insulating layer 240 is i.e. corresponding to first electrode pattern 221, second electrode pattern 222, third electrode pattern
223 and the 4th electrode pattern 224 central portion position at include along thickness direction run through insulating layer 240 groove 225.
Groove 225 can be formed by laser punching (laser punching) or mechanical hole-punching method.
Magnetic substance can be filled in groove 225 and form core 226.
In the method that magnetic substance is filled in groove 225, ferrite lamellae can be laminated and be compacted at least the one of insulating layer
A surface utilizes magnetic resin composite material.
Magnetic resin composite material refers to the composite material manufactured by the way that magnetic material is distributed to macromolecule resin, makees
For magnetic materials such as magnetic material available iron ferritic, pure iron.
When filling magnetic resin composite material in groove 225, the magnetic susceptibility of groove 225 can be according to included in magnetic substance
The content of magnetic material in resin composite materials and it is adjusted.
Insulating layer 240 includes：Coil part 241 is disposed with spiral first electrode pattern 221, second electrode pattern
222nd, 223 and the 4th electrode pattern 224 of third electrode pattern；Inside ampleness portion 242 is arranged in the inside of coil part 241；Outside
Side ampleness portion 243 is arranged in the outside of coil part 241.
That is, inside ampleness portion 242 is defined as：In insulating layer 240, positioned in first electrode pattern 221, second electrode
The region of the inside of the part of most inner side arrangement in pattern 222,223 and the 4th electrode pattern 224 of third electrode pattern；Outside
Side ampleness portion 243 is defined as：In insulating layer 240, positioned in first electrode pattern 221, second electrode pattern 222, third
The region in the outside of the part of the outermost arrangement in 223 and the 4th electrode pattern 224 of electrode pattern.
The central portion of insulating layer 240 be disposed with groove 225 filled by magnetic substance and the core 226 that is formed, in insulating layer
240 outside is disposed with the side cap 227 comprising magnetic substance.
The available magnetic substance identical with core 226 of side cap 227 and formed, however be not limited thereto.
For example, core 226, and the shape using magnetic resin composite material can be formed by being laminated, being compacted ferrite lamellae
Into side cap 227, however it is not limited thereto.
Due to being disposed with the core 226 comprising magnetic substance in the central portion of insulating layer 240, and around insulating layer 240
The side cap 227 for including magnetic substance is disposed with, so forming closed magnetic circuit around coil, therefore according to the present invention another
The common-mode filter 100 of embodiment can have high impedance capacity.
However, it is necessary to further improve the impedance capacity of common-mode filter 200.
In order to further improve the impedance capacity of common-mode filter 200, for being total to according to another embodiment of the present invention
For mode filter 200, when first electrode pattern 221, second electrode pattern 222,223 and the 4th electricity of third electrode pattern
The line width of pole figure case 224 is set as W, and the width in inside ampleness portion 242 is set as D1, the width in outside ampleness portion 242 is set
When being set to D2, meet D1+D2<4W.
That is, for common-mode filter 200 according to another embodiment of the present invention, due to meeting D1+D2<4W, institute
Common-mode filter 200 can be increased by the volume of magnetic substance that the central portion and surrounding for increasing insulating layer 240 are arranged
Impedance capacity.
As long as the thickness in inside ampleness portion 242 and outside ampleness portion 243, which reaches, is able to maintain that first electrode pattern 221,
Two electrode patterns 222,223 and the 4th electrode pattern 224 of third electrode pattern insulating properties degree with regard to enough.
For example, it is also possible to be formed as D1 more than D2.When being formed as D1 more than D2, for the sky of the formation of side cap 227
Between can obtain sufficient increase.
That is, as the space formed for side cap 227 is increased, when side cap 227 forms magnetic substance,
The effect that impedance capacity with common-mode filter 200 significantly rises.
Different from this, D2 can also be formed as more than D1.When being formed as D2 more than D1, for the space of the formation of core 226
It can obtain sufficient increase.
That is, as the space formed for core 226 is increased, when forming magnetic substance in core 226, there is common mode filter
The effect that the impedance capacity of wave device 200 significantly rises.
Upper cover 230 can be disposed on the top of filtering part 220.
Upper cover 230 may include magnetic material, such as can be the either magnetic tree of material that ferrite lamellae has been laminated
Resin composite material.The composite material that magnetic resin composite material refers to magnetic material being distributed to macromolecule resin and manufacture, makees
Pure iron, ferrite etc. can be utilized for magnetic material.
More than, it has been detailed that the embodiment of the present invention, however the invention is not limited in above-described embodiment and attached drawing, and
It is intended to limit the present invention by claims.
It therefore, can be by institute of the present invention in the range of the technological thought for not departing from the present invention described in claim
The people for having average knowledge in the technical field of category implements displacement, deformation and the change of variform, and these should also be as recognizing
To belong to the scope of the present invention.
Claims (10)
1. a kind of common-mode filter, wherein, including：
Main body includes filtering part；
First external electrode, the second external electrode, third external electrode and the 4th external electrode are arranged in the outer of the main body
Side；
First coil is arranged in the filtering part, and comprising spiral first electrode pattern, both ends are electrically connected to described first
External electrode and second external electrode；
Second coil is arranged in the filtering part, and including spiral second electrode pattern, both ends are electrically connected to the third
External electrode and the 4th external electrode；And
Insulating layer arranged in the filtering part in a manner of surrounding the first electrode pattern and the second electrode pattern, and
Groove is formed in position corresponding with the central portion of the first electrode pattern and the second electrode pattern,
Wherein, the insulating layer includes：
Inside ampleness portion is defined as the most inner side being located in the first electrode pattern and second electrode pattern arrangement
Part inside region；And
Outside ampleness portion is defined as the outermost being located in the first electrode pattern and second electrode pattern arrangement
Part outside region,
Wherein, the line width of the first electrode pattern and the second electrode pattern is being set as W, and by the inside ampleness
The width in portion is set as D1, when the width in the outside ampleness portion is set as D2, meets D1+D2<4W.
2. common-mode filter as described in claim 1, wherein, meet following condition：
D1 is more than D2.
3. common-mode filter as described in claim 1, wherein, meet following condition：
D1 is less than D2.
4. common-mode filter as described in claim 1, wherein, it further includes：
It is filled with the core of magnetic substance in the trench.
5. common-mode filter as described in claim 1, wherein, it further includes：
Side cap, surrounds the outside of the insulating layer, and includes magnetic substance.
6. a kind of common-mode filter, including：
Main body includes filtering part；
First external electrode, the second external electrode, third external electrode and the 4th external electrode are arranged in the outer of the main body
Side；
First coil is arranged in the filtering part, includes spiral first electrode pattern and second electrode pattern, both ends electricity
It is connected to first external electrode and second external electrode；
Second coil is arranged in the filtering part, includes spiral third electrode pattern and the 4th electrode pattern, both ends electricity
It is connected to the third external electrode and the 4th external electrode；And
Insulating layer, in the filtering part to surround the first electrode pattern, the second electrode pattern, the third electrode figure
Case and the mode of the 4th electrode pattern arrange, and with the first electrode pattern, the second electrode pattern, described
The corresponding position of central portion of three electrode patterns and the 4th electrode pattern is formed with groove,
Wherein, the insulating layer includes：
Inside ampleness portion is defined as being located in the first electrode pattern, the second electrode pattern, the third electrode figure
The region of the inside of the part of most inner side arrangement in case and the 4th electrode pattern；And
Outside ampleness portion is defined as being located in the first electrode pattern, the second electrode pattern, the third electrode figure
The region in the outside of the part of the outermost arrangement in case and the 4th electrode pattern,
Wherein, by the first electrode pattern, the second electrode pattern, the third electrode pattern and the 4th electrode
The line width of pattern is set as W, and the width in the inside ampleness portion is set as D1, and the width in the outside ampleness portion is set
During for D2, meet D1+D2<4W.
7. common-mode filter as claimed in claim 6, wherein, meet following condition：
D1 is more than D2.
8. common-mode filter as claimed in claim 6, wherein, meet following condition：
D1 is less than D2.
9. common-mode filter as claimed in claim 6, wherein, it further includes：
It is filled with the core of magnetic substance in the trench.
10. common-mode filter as claimed in claim 6, wherein, it further includes：
Side cap, surrounds the outside of the insulating layer, and includes magnetic substance.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20160170185 | 2016-12-14 | ||
| KR10-2016-0170185 | 2016-12-14 |
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| CN108231359A true CN108231359A (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710522119.9A Pending CN108231359A (en) | 2016-12-14 | 2017-06-30 | Common-mode filter |
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