CN103594223B - common-mode signal filter - Google Patents
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- CN103594223B CN103594223B CN201210289194.2A CN201210289194A CN103594223B CN 103594223 B CN103594223 B CN 103594223B CN 201210289194 A CN201210289194 A CN 201210289194A CN 103594223 B CN103594223 B CN 103594223B
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Abstract
A kind of common-mode signal filter, it comprises the insulated substrate of a non magnetic material, a winding stack structure, an insulating barrier and a magnetic material layer.It is characterized in that, this winding stack vibrational power flow is on the insulated substrate of this non magnetic material, this winding stack structure comprises one first coil and one second coil, and this first coil and this second coil are coupled and arrange jointly eliminate common-mode noise, this magnetic material layer is criticized by this insulating barrier and is overlying in this winding stack structure, wherein, the total line length L(mm of one of them of this first coil and this second coil) and live width W(mm) meet a relational expression: [(14.1-fc)/6.5]
2aMP.AMp.Amp lt; L/W & lt; [(16.7-fc)/4.5]
2, fc(MHz wherein) and be the cut-off frequency of difference mode signal.
Description
Technical field
The present invention relates to a kind of common-mode signal filter, espespecially a kind of film-type common-mode signal filter being applied to portable electronic devices.
Background technology
Common-mode signal filter is a kind of for suppressing the element of common mode current, and described common mode current can cause electromagnetic interference (Electromagneticinterference in parallel transmission circuit; EMI) generation, it is the source of a kind of noise in electronic circuit.Along with the microminiaturization of portable electronic devices, the common-mode signal filter being applied to portable electronic devices is required microminiaturized and highdensity structure more, therefore diaphragm type and laminated type common-mode signal filter replace conventional roll line style common-mode filter gradually.
Japanese patent application publication No. JP2000173824A discloses a kind of electronic component, and it has an insulated substrate, a duplexer and an external electrode terminals portion; Conductive pattern and insulating barrier interaction cascading are formed by this duplexer on aforementioned dielectric substrate, this external electrode terminals portion is electrically connected to aforementioned conductive pattern, and cross over aforementioned dielectric substrate and aforementioned duplexer and formed, wherein, the layer or small pieces that are made up of magnetic is provided with, in order to cover aforementioned conductive pattern at least partially in this electronic component.
Though prior art has the conductive pattern disclosed by changing duplexer to control common code impedance, but conductive pattern and insulating barrier interaction cascading, therefore comparatively complicated in structure, and the state-variable of impact is a lot of.In addition, prior art also discloses can via the thickness of adjustment insulating barrier adjust common code impedance, but the thickness of insulating barrier is not easy to control, and this kind of mode can increase manufacturing cost.
In view of this, inventor, according to manufacturing development and design experiences that to be engaged in Related product for many years, after designing in detail and to assess with discretion, obtains the present invention of a kind of true tool practicality finally for above-mentioned target.
Summary of the invention
In order to can strengthen and accurately control common code impedance, the invention provides a kind of structure simple and can the thin-film common-mode filter of effective microminiaturization.According to one embodiment of the invention, described thin-film common-mode filter sequentially comprises insulated substrate, one first coil body layer, one first electric insulation layer, coil extraction layer, one second electric insulation layer, one second coil main body layer, an insulating barrier and a magnetic material layer of a non magnetic material.
Wherein, this first coil body layer be arranged at this non magnetic material insulated substrate on and there is one first coil; The top that layer is arranged at this first coil body layer drawn by this coil; This first electric insulation layer is provided with one first conductive structure, and this first electric insulation layer is arranged at this first coil body layer and this coil is drawn between layer, wherein, layer this first conductive structure of electric property coupling respectively drawn by this first coil body layer and this coil; This second coil main body layer is arranged at this coil and draws the top of layer and have one second coil; This second electric insulation layer is provided with one second conductive structure, and this second electric insulation layer is arranged between this coil extraction layer and this second coil main body layer, wherein, this coil draws layer and this second coil main body layer this second conductive structure of electric property coupling respectively.
This insulating barrier is arranged on this second electric insulation layer; And this magnetic material layer is arranged on this insulating barrier; Wherein, the total line length L(mm of one of them of this first coil and this second coil) and live width W(mm) meet a relational expression:
[(14.1-fc)/6.5]
2<L/W< [(16.7-fc)/4.5]
2, wherein fc is the cut-off frequency of difference mode signal.
According to another embodiment of the present invention, described thin-film common-mode filter sequentially comprise a non magnetic material insulated substrate, a lower coil draws layer, one first electric insulation layer, one first coil body layer, one second electric insulation layer, one second coil main body layer, coil draws layer, an insulating barrier and a magnetic material layer on one the 3rd electric insulation layer.
Wherein, this lower coil extraction layer is arranged on the insulated substrate of this non magnetic material; This first coil body layer is arranged at this lower coil and draws the top of layer and have one first coil; This first electric insulation layer is provided with one first conductive structure, and this first electric insulation layer is arranged between this lower coil extraction layer and this first coil body layer, wherein, this lower coil draws layer and this first coil body layer this first conductive structure of electric property coupling respectively; This second coil main body layer is arranged at the top of this second coil main body layer and has one second coil; This second electric insulation layer is arranged between this first coil body layer and this second coil main body layer.
On this, the top that layer is arranged at this second coil main body layer drawn by coil; This second electric insulation layer is provided with one second conductive structure, and this second electric insulation layer is arranged at this second coil main body layer and on this, coil is drawn between layer, wherein, this second coil main body layer and on this coil draw layer respectively this second conductive structure of electric property coupling; This insulating barrier is arranged at coil on this and draws on layer; And this magnetic material is placed on this insulating barrier; Wherein, the total line length L(mm of one of them of this first coil and this second coil) and live width W(mm) meet a relational expression:
[(15.4-fc)/14.3]
2<L/W< [(18.2-fc)/12.0]
2, wherein fc is the cut-off frequency of difference mode signal.
In sum, in common-mode signal filter of the present invention, the first coil of electrical series and the second coil can each other magnetic couplings to eliminate common-mode noise.Moreover by being arranged on the insulated substrate of non magnetic material by the first coil and the second coil, cutoff frequency can control accurately to control common code impedance in a scope by described common-mode signal filter, and can be effectively microminiaturized.
Accompanying drawing explanation
Fig. 1 is the exploded view of the common-mode signal filter of the first embodiment of the present invention;
Fig. 2 is that the cut-off frequency of common-mode signal filter of the present invention generation is to the relation schematic diagram of total line length of each coil divided by live width;
Fig. 3 A is the exploded view of the common-mode signal filter of the second embodiment of the present invention;
Fig. 3 B is the exploded view of the common-mode signal filter of the third embodiment of the present invention;
Fig. 4 is the exploded view of the common-mode signal filter of the fourth embodiment of the present invention;
Fig. 5 is that the cut-off frequency of the common-mode signal filter generation of the fourth embodiment of the present invention is to the relation schematic diagram of total line length of each coil divided by live width;
Fig. 6 A is the exploded view of the common-mode signal filter of the fifth embodiment of the present invention; And
Fig. 6 B is the exploded view of the common-mode signal filter of the sixth embodiment of the present invention.
[main element symbol description]
1,1A, 1B common-mode signal filter
The insulated substrate of 10 non magnetic materials
20 winding stack structures
21 first coil body layers
211 first coils
2111 inner ends
2112 outer ends
212 first electrodes
213 second electrodes
214 third electrodes
215 the 4th electrodes
22 first electric insulation layers
221 first conductive structures
222 through holes
Layer drawn by 23 coils
231L shape wire
2311 inner ends
2312 outer ends
232 first electrodes
233 second electrodes
234 third electrodes
235 the 4th electrodes
24 second electric insulation layers
241 second conductive structures
242 through holes
25 second coil main body layers
251 second coils
2511 inner ends
2512 outer ends
252 first electrodes
253 second electrodes
254 third electrodes
255 the 4th electrodes
30 insulating barriers
40 magnetic material layers
50 magnetic portion
1C, 1D, 1E common-mode signal filter
The insulated substrate of the 10 ' non magnetic material
20 ' winding stack structure
21 ' lower coil draws layer
211 ' L shape wire
2111 ' inner end
2112 ' outer end
212 ' first electrode
213 ' second electrode
214 ' third electrode
215 ' the 4th electrode
22 ' first electric insulation layer
221 ' first conductive structure
222 ' through hole
23 ' first coil body layer
231 ' first coil
2311 ' inner end
2312 ' outer end
232 ' first electrode
233 ' second electrode
234 ' third electrode
235 ' the 4th electrode
24 ' second electric insulation layer
241 ' through hole
25 ' second coil main body layer
251 ' second coil
2511 ' inner end
2512 ' outer end
252 ' first electrode
253 ' second electrode
254 ' third electrode
255 ' the 4th electrode
26 ' the 3rd electric insulation layer
261 ' second conductive structure
262 ' through hole
Layer drawn by 27 ' upper coil
271 ' L shape wire
2711 ' inner end
2712 ' outer end
272 ' first electrode
273 ' second electrode
274 ' third electrode
275 ' the 4th electrode
30 ' insulating barrier
40 ' magnetic material layer
50 ' magnetic portion
G1, G2 Trendline
Embodiment
(the first embodiment)
Refer to Fig. 1, the exploded view of the common-mode signal filter 1 of its display first embodiment of the present invention.Described common-mode signal filter 1 comprises insulated substrate 10, winding stack structure 20, insulating barrier 30 and a magnetic material layer 40 of a non magnetic material.
Specifically, winding stack structure 20 is arranged on the insulated substrate 10 of non magnetic material, and winding stack structure 20 sequentially comprises one first coil body layer 21,1 first electric insulation layer 22, coil extraction layer 23,1 second electric insulation layer 24 and one second coil main body layer 25.Wherein insulating barrier 30 is arranged between winding stack structure 20 and magnetic material layer 40, makes magnetic material layer 40 batches be overlying in winding stack structure 20 to become the lid of common-mode signal filter 1, can increase the inductive effect of common-mode signal filter 1.In the present embodiment, described insulating barrier 30 can be a cementing layer, but not as limit.
The specific features of winding stack structure 20 will be described in detail in detail below, first coil body layer 21 is arranged on the insulated substrate 10 of non magnetic material, and the first coil body layer 21 comprises one first coil 211,1 first electrode 212,1 second electrode 213, third electrode 214 and one the 4th electrode 215.Wherein the first coil 211 has inner end 2111 and an outer end 2112, and the outer end 2112 of the first coil 211 is electrically connected at the first electrode 212.
The top that layer 23 is arranged at the first coil body layer 21 drawn by coil, and coil is drawn layer 23 and had L shape wire 231,1 first electrode 232,1 second electrode 233, third electrode 234 and one the 4th electrode 235 that are parallel to each other for a pair.Wherein this respectively has inner end 2311 and an outer end 2312 to L shape wire 231, and this connects third electrode 234 and the 4th electrode 235 respectively to the outer end 2312 of L shape wire.
First electric insulation layer 22 has relative upper and lower surface, and coil extraction layer 23 and the first coil body layer 21 are formed at the upper and lower surface of the first electric insulation layer 22 respectively.First electric insulation layer 22 is provided with one first conductive structure 221, and the inner end 2111 of the first coil 211 is connected described first conductive structure 221 to reach electrical communication respectively with the inner end 2311 of a wherein L shape wire 231.Described first conductive structure 221 can be electrically connected through hole or the conductive pole of through first electric insulation layer 22, but the structure of described first conductive structure 221, pattern do not limit.
Second coil main body layer 25 is arranged at the top that layer 23 drawn by coil, and the second coil main body layer 25 comprises one second coil 251,1 first electrode 252,1 second electrode 253, third electrode 254 and one the 4th electrode 255.Wherein, the first coil 211 and the second coil 251 are coupled and arrange to make both can complement filter common-mode noise, and the second coil 251 has inner end 2511 and an outer end 2512, and the outer end 2512 of the second coil 251 is electrically connected the second electrode 253.
Second electric insulation layer 24 has relative upper and lower surface, and the second coil main body layer 25 draws with coil the upper and lower surface that layer 23 is formed at the second electric insulation layer 24 respectively.Second electric insulation layer 24 is provided with one second conductive structure 241, and the inner end 2311 of the inner end 2511 of the second coil 251 and wherein another L shape wire 23 connects described second conductive structure 241 respectively to reach electrical communication.Wherein the second conductive structure 241 can be electrically connected through hole or the conductive pole of through second electric insulation layer 24, but the structure of described second conductive structure 241, pattern do not limit.
In this specific embodiment, the first coil 211 and the second coil 231 can be the helical coils of rectangle, but also can be the helical coils of other shapes.Moreover, first coil 211 and the second coil 231 have identical winding number, first coil 211 and the second coil 231 are roughly overlapping on the direction of the insulated substrate 10 perpendicular to non magnetic material, and each electrode that the first coil body layer 21, wire draw layer 23 and the second coil main body layer 25 is also roughly overlapping on the direction of the insulated substrate 10 perpendicular to non magnetic material.
Refer to Fig. 2, it is common-mode signal filter 1 in time operating, and total line length of the corresponding each coil of cut-off frequency of generation is divided by the relation schematic diagram of live width.It is worth mentioning that, described common-mode signal filter 1, by being arranged on the insulated substrate 10 of non magnetic material by the first coil 211 of rectangular coil shape and the second coil 231, is wherein preferably aluminium oxide (AL
2o
3) substrate, aluminium nitride (AIN) substrate, glass (Glass) or quartz, therefore enough meet following relational expression:
[(14.1-fc)/6.5]
2<L/W< [(16.7-fc)/4.5]
2, fc is wherein the cut-off frequency of difference mode signal, and L is total line length of the first coil 211 or the second coil 231, and W is the live width of the first coil 211 or the second coil 231.
In more detail, the corresponding total line length of each cut-off frequency all falls in the scope of Trendline G1 and Trendline G2 divided by the node of live width, it can thus be appreciated that, the cut-off frequency that common-mode signal filter 1 can control to produce is roughly in the scope of 4 to 10MHz, accurately to control its common code impedance, thus the demand of specific portable electronic devices can be met.
In addition, in this specific embodiment, layer 23, second coil main body layer 25 drawn by first coil body layer 21, coil can via multiple techniques such as thin film metal deposition, gold-tinted, etchings, or shaping via electroplating technology, and the material that the first coil body layer 21, coil draw layer 23 and the second coil main body layer 25 can be the electric conducting materials such as silver (Ag), palladium (Pd), aluminium (Al), chromium (Cr), nickel (Ni), titanium (Ti), gold (Au), copper (Cu) or platinum (Pt).
In addition, the first electric insulation layer 22 and the second electric insulation layer 24 are with pi (polyimide), epoxy resin (epoxyresin) or benzocyclobutane olefine resin (benzocyclobutene; The insulating material such as BCB), these materials have preferably electrically, mechanical property, and can be shaping via spin coating proceeding.Again, magnetic material layer 40 can be magnetic base material or the colloid being mixed with Magnaglo, wherein the colloid of mictomagnetism powder is Magnaglo and pi (polyimide), epoxy resin (epoxyresin), benzocyclobutane olefine resin (BCB) or other high molecular polymer mixed-formings, and magnetic material layer 40 is same shaping via spin coating proceeding.
(the second embodiment)
Refer to Fig. 3 A, the exploded view of the common-mode signal filter 1A of its display second embodiment of the present invention.Be with the difference of the first embodiment, described common-mode signal filter 1A also comprises another magnetic material layer 40, and this another magnetic material layer 40 is arranged between the insulated substrate 10 of winding stack structure 20 and non magnetic material.
In more detail, this magnetic material layer 40 is located between the first coil body layer 21 and the insulated substrate 10 of non magnetic material, in order to reach higher common-mode noise filtration result.Similarly, total line length L(mm of the first coil 211 and the second coil 251) and live width W(mm) following relational expression can be met:
[(14.1-fc)/6.5]
2<L/W< [(16.7-fc)/4.5]
2, wherein fc is the cut-off frequency of difference mode signal, and cut-off frequency is roughly between 4 to 10MHz, meets the demand of specific portable electronic devices.
(the 3rd embodiment)
Refer to Fig. 3 B, the exploded view of the common-mode signal filter 1B of its display third embodiment of the present invention.Be with the difference of the second embodiment, described common-mode signal filter 1B also comprises multiple magnetic portion 50.Specifically, these magnetic portion 50 are FERRITE CORE (Ferritecore), and it is high that it has magnetic permeability, have high resistance and the advantage such as eddy current loss is little in frequency range widely.
In addition, the first electric insulation layer 22 and the second electric insulation layer 24 all offer a through hole 222,242, and through hole 222 and through hole 242 are adjacent to the first conductive structure 221 and the second conductive structure 241 respectively.By this, these magnetic portion 50 by through hole 222,242 be arranged at the first coil 211 inner side, this is to the inner side of one end of L shape wire 231 and the second coil 251, to increase the stability of common-mode signal filter 1B, and the magnetic field intensity that can increase between the first coil body layer 21 and the second coil main body layer 25, namely the cross-field intensity between the first coil 211 of mutual magnetic couplings and the second coil 251, strengthens the common code impedance of the first coil 211 and the second coil 251 further.
In addition, total line length L(mm of the first coil 211 and the second coil 251) and live width W(mm) meet following relational expression equally: [(14.1-fc)/6.5]
2<L/W< [(16.7-fc)/4.5]
2, wherein fc is the cut-off frequency of difference mode signal, and cut-off frequency is roughly between 4 to 10MHz, meets the demand of specific portable electronic devices.
(the 4th embodiment)
Refer to Fig. 4, the exploded view of the common-mode signal filter 1C of its display fourth embodiment of the present invention.Described common-mode signal filter 1C comprises insulated substrate 10 ', winding stack structure 20 ', insulating barrier 30 ' and a magnetic material layer 40 ' of a non magnetic material.
Specifically, for enabling described common-mode signal filter 1C produce wider cut-off frequency, winding stack structure 20 ' sequentially comprises a lower coil and draws coil extraction layer 27 ' on layer 21 ', one first electric insulation layer 22 ', one first coil body layer 23 ', 1 second electric insulation layer 24 ', one second coil main body layer 25 ', the 3rd electric insulation layer 26 ' and.Wherein, lower coil is drawn layer 21 ' and is arranged on the insulated substrate 10 ' of non magnetic material, lower coil is drawn layer 21 ' and is comprised L shape wire 211 ', 1 first electrode 212 ', one second electrode 213 ', a third electrode 214 ' and one the 4th electrode 215 ', wherein L shape wire 211 ' has an inner end 2111 ' and an outer end 2112 ', and the outer end 2112 ' of L shape wire 211 ' is connected to the first electrode 212 '.
First coil body layer 23 ' is arranged at the top that lower coil draws layer 23 ', first coil body layer 23 ' comprises one first coil 231 ', one first electrode 232 ', one second electrode 233 ', a third electrode 234 ' and one the 4th electrode 235 ', wherein the first coil 231 ' has an inner end 2311 ' and an outer end 2312 ', and the outer end 2312 ' of the first coil 231 ' is connected to third electrode 234 '.
First electric insulation layer 22 ' has relative upper and lower surface, and the first coil body layer 23 ' draws with lower coil the upper and lower surface that layer 21 ' is formed at the first electric insulation layer 22 ' respectively, first electric insulation layer 22 is also provided with one first conductive structure 221 ', and the inner end 2111 ' of L shape wire 211 ' and the inner end 2311 ' of the first coil 231 ' are connected to the first conductive structure 221 ' to reach electrical communication.Described first conductive structure 221 ' can be electrically connected through hole or the conductive pole of through first electric insulation layer 22 ', but the structure of described first conductive structure 221 ', pattern do not limit.
Second coil main body layer 25 ' is arranged at the top of the first coil body layer 23 ', and the second coil main body layer 25 ' comprises one second coil 251 ', one first electrode 252 ', one second electrode 253 ', a third electrode 254 ' and one the 4th electrode 255 ', wherein the second coil 251 ' and the first coil 231 ' are coupled and arrange to make both can complement filter common-mode noise.Second coil 251 ' has an inner end 2511 ' and an outer end 2512 ', and the outer end 2512 ' of the second coil 251 ' is connected to the 4th electrode 255 '.
Second electric insulation layer 24 has relative upper and lower surface, and the second coil main body layer 25 ' and the first coil body layer 23 ' are formed at the upper and lower surface of the second electric insulation layer 24 respectively, the second coil 251 ' and the first coil 231 ' are made in same aspect jointly.
The top that layer 27 ' is arranged at the second coil main body layer 25 ' drawn by upper coil, upper coil is drawn layer 27 ' and is comprised L shape wire 271 ', 1 first electrode 272 ', one second electrode 273 ', a third electrode 274 ' and one the 4th electrode 275 ', wherein L shape wire 271 ' has an inner end 2711 ' and an outer end 2712 ', and the outer end 2712 ' of L shape wire 271 ' is connected to the second electrode 273 '.
3rd electric insulation layer 26 ' has relative upper and lower surface, and upper coil extraction layer 27 ' and the second coil main body layer 25 ' are formed at the upper and lower surface of the 3rd electric insulation layer 26 ' respectively.3rd electric insulation layer 26 ' is also provided with one second conductive structure 261 ', and the inner end 2711 ' of L shape wire 271 ' and the inner end 2511 ' of the second coil 251 ' are connected to the second conductive structure 261 ' to reach electrical communication.Described second conductive structure 261 ' can be electrically connected through hole or the conductive pole of through 3rd electric insulation layer 26 ', but the structure of described second conductive structure 261 ', pattern do not limit.
In addition, in this specific embodiment, the first coil 231 ' and the second coil 251 ' can be the helical coils of rectangle, but also can be the helical coils of other shapes.Moreover, first coil 231 ' and the second coil 251 ' have identical winding number, first coil 231 ' and the second coil 251 ' are roughly overlapping on the direction of the insulated substrate 10 ' perpendicular to non magnetic material, and each electrode that lower coil draws layer 21 ', the first coil body layer 23 ', second coil main body layer 25 ' and upper coil extraction layer 27 ' is also roughly overlapping on the direction of the insulated substrate 10 ' perpendicular to non magnetic material.
Refer to Fig. 5, it is common-mode signal filter 1C in time operating, and total line length of the corresponding each coil of cut-off frequency of generation is divided by the relation schematic diagram of live width.It is worth mentioning that, described common-mode signal filter 1C, by being arranged on the insulated substrate 10 ' of non magnetic material by the first coil 231 ' of rectangular coil shape and the second coil 251 ', is wherein preferably aluminium oxide (AL
2o
3) substrate, aluminium nitride (AIN) substrate, glass (Glass) or quartz base plate, therefore enough meet following relational expression:
[(15.4-fc)/14.3]
2<L/W< [(18.5-fc)/12.0]
2, fc is wherein the cut-off frequency of difference mode signal, and L is total line length of the first coil 231 ' or the second coil 251 ', and W is the live width of the first coil 231 ' or the second coil 251 '.
In more detail, the corresponding total line length of each cut-off frequency all falls in the scope of Trendline G1 and Trendline G2 divided by the node of live width, it can thus be appreciated that, common-mode signal filter 1C can control the wider cut-off frequency of generation scope, it is roughly in the scope of 2 to 10MHz, accurately to control its common code impedance, the demand of specific portable electronic devices thus can be met.
(the 5th embodiment)
Refer to the exploded view of the common-mode signal filter 1D of its display fifth embodiment of the present invention of Fig. 6 A.Be with the difference of the 4th embodiment, described common-mode signal filter 1D also comprises another magnetic material layer 40 ', and this another magnetic material layer 40 ' is arranged between the insulated substrate 10 ' of winding stack structure 20 ' and non magnetic material.
Specifically, this magnetic material layer 40 ' is located between lower coil extraction layer 21 ' and the insulated substrate 10 ' of non magnetic material, in order to reach higher common-mode noise filtration result.Similarly, total line length L(mm of the first coil 231 ' and the second coil 251 ') and live width W(mm) following relational expression can be met:
[(15.4-fc)/14.3]
2<L/W< [(18.5-fc)/12.0]
2, fc is wherein the cut-off frequency of difference mode signal, and cut-off frequency is roughly between 2 to 10MHz, meets the demand of specific portable electronic devices.
(the 6th embodiment)
Refer to the exploded view of the common-mode signal filter 1E of its display sixth embodiment of the present invention of Fig. 6 B.Be with the difference of the 5th embodiment, described common-mode signal filter 1 also comprises multiple magnetic portion 50 '.Specifically, these magnetic portion 50 ' are FERRITE CORE (Ferritecore), and it is high that it has magnetic permeability, have high resistance and the advantage such as eddy current loss is little in frequency range widely.
Moreover, the first electric insulation layer 22 ' offers on through hole 222 ', the second electric insulation layer 24 ' and offer a through hole 241 ', and the 3rd electric insulation layer 26 ' offers a through hole 262 '.Wherein, through hole 222 ' and 262 ' is adjacent to the first conductive structure 221 ' and the second conductive structure 261 ' respectively, and through hole 241 ' is then positioned at the opposite position of through hole 222 ' and 262 '.
By this, these magnetic portion 50 ' are arranged at one end of the inner side of the first coil 231 ', the inner side of the second coil 251 ' and L shape wire 211 ', L shape wire 271 ' by through hole 222 ', 241 ' and 262 ', in order to increase the stability of common-mode signal filter 1E, and the magnetic field intensity that can increase between the first coil body layer 23 ' and the second coil main body layer 25 ', namely the cross-field intensity between the first coil 231 ' of mutual magnetic couplings and the second coil 251 ', strengthens the common code impedance of the first coil 231 ' and the second coil 251 ' further.
In addition, total line length L(mm of the first coil 231 ' and the second coil 251 ') and live width W(mm) meet following relational expression equally:
[(15.4-fc)/14.3]
2<L/W< [(18.5-fc)/12.0]
2, fc is wherein the cut-off frequency of difference mode signal, and cut-off frequency is roughly between 2 to 10MHz, meets the demand of specific portable electronic devices.
In sum, in common-mode signal filter of the present invention, the first coil of electrical series and the second coil can each other magnetic couplings to eliminate common-mode noise.Moreover, by the first coil and the second coil are arranged on the insulated substrate of non magnetic material, cutoff frequency can control in a scope by described common-mode signal filter, in order to accurately to control common code impedance, and can effectively reduce its thickness, not needing the thickness by controlling insulating barrier to adjust common mode block to resist, reaching microminiaturized object.
In addition, according to alternate embodiment of the present invention, common-mode signal filter of the present invention is by changing its winding stack structure, and cut-off frequency can be adjusted toward low frequency, and can filter more noise, range of application is more extensive.
Claims (10)
1. a common-mode signal filter, is characterized in that, comprising:
The insulated substrate of one non magnetic material;
One first coil body layer, it has one first coil, and described first coil body layer is arranged on the insulated substrate of described non magnetic material;
Layer drawn by one coil, and it is arranged at the top of described first coil body layer;
One first electric insulation layer, be provided with one first conductive structure, described first electric insulation layer is arranged at described first coil body layer and described coil is drawn between layer, wherein, described first coil body layer and described coil draw layer respectively with described first conductive structure electric property coupling;
One second coil main body layer, it has one second coil, and described second coil main body layer is arranged at the top that layer drawn by described coil;
One second electric insulation layer, be provided with one second conductive structure, described second electric insulation layer is arranged at described coil and draws between layer and described second coil main body layer, wherein, described coil draw layer and described second coil main body layer respectively with described second conductive structure electric property coupling;
One insulating barrier, it is arranged on described second coil main body layer; And
One first magnetic material layer, it is arranged on described insulating barrier;
Wherein, the total line length L and live width W of one of them of described first coil and described second coil meets a relational expression:
[(14.1-fc)/6.5]
2<L/W< [(16.7-fc)/4.5]
2, wherein fc is the cut-off frequency of difference mode signal, and the unit of wherein said total line length is mm, and the unit of described live width is mm, and the unit of the cut-off frequency of described difference mode signal is MHz.
2. common-mode signal filter according to claim 1, is characterized in that, also comprises the second magnetic material layer, and described second magnetic material layer is arranged between the insulated substrate of described non magnetic material and described first coil body layer.
3. common-mode signal filter according to claim 1, it is characterized in that, also comprise multiple magnetic portion, described first electric insulation layer and described second electric insulation layer offer a through hole respectively, described coil is drawn layer and is had pair of L-shaped wire, and described magnetic portion is arranged at the inner side of one end of described L shape wire, the inner side of described first coil and described second coil by the through hole of described first electric insulation layer and described second electric insulation layer.
4. common-mode signal filter according to claim 3, is characterized in that, contiguous described first conductive structure of through hole of described first electric insulation layer is arranged, and contiguous described second conductive structure of through hole of described second electric insulation layer is arranged.
5. common-mode signal filter according to claim 1, is characterized in that, the material of the insulated substrate of described non magnetic material is aluminium oxide, aluminium nitride, glass or quartz.
6. a common-mode signal filter, is characterized in that, comprising:
The insulated substrate of one non magnetic material;
One lower coil draws layer, and it is arranged on the insulated substrate of described non magnetic material;
One first coil body layer, it has one first coil, and described first coil body layer is arranged at the top that described lower coil draws layer;
One first electric insulation layer, be provided with one first conductive structure, described first electric insulation layer is arranged at described lower coil and draws between layer and described first coil body layer, wherein, described lower coil draw layer and described first coil body layer respectively with described first conductive structure electric property coupling;
One second coil main body layer, it has one second coil, and described second coil main body layer is arranged at the top of described first coil body layer;
One second electric insulation layer, it is arranged between described first coil body layer and described second coil main body layer;
On one, layer drawn by coil, and it is arranged at the top of described second coil main body layer;
One the 3rd electric insulation layer, be provided with one second conductive structure, described 3rd electric insulation layer is arranged at described second coil main body layer and described upper coil is drawn between layer, wherein, described second coil main body layer and described upper coil draw layer respectively with described second conductive structure electric property coupling;
One insulating barrier, it is arranged at described upper coil and draws on layer; And
One first magnetic material layer, it is arranged on described insulating barrier;
Wherein, the total line length L and live width W of one of them of described first coil and described second coil meets a relational expression:
[(15.4-fc)/14.3]
2<L/W< [(18.2-fc)/12.0]
2, wherein fc is the cut-off frequency of difference mode signal, and the unit of wherein said total line length is mm, and the unit of described live width is mm, and the unit of the cut-off frequency of described difference mode signal is MHz.
7. common-mode signal filter according to claim 6, is characterized in that, also comprises the second magnetic material layer, and described second magnetic material layer is arranged at the insulated substrate of described non magnetic material and described lower coil is drawn between layer.
8. common-mode signal filter according to claim 6, it is characterized in that, also comprise multiple magnetic portion, described first electric insulation layer, described second electric insulation layer and described 3rd electric insulation layer offer a through hole respectively, layer drawn by described upper coil and described lower coil extraction layer has a L shape wire respectively, described magnetic portion is by described first electric insulation layer, the through hole of described second electric insulation layer and described 3rd electric insulation layer is arranged at one end that described lower coil draws the L shape wire of layer, the inner side of described first coil, one end of the described L shape wire of layer drawn by the inner side of described second coil and described upper coil.
9. common-mode signal filter according to claim 8, it is characterized in that, contiguous described first conductive structure of through hole of described first electric insulation layer is arranged, contiguous described second conductive structure of the through hole of described 3rd electric insulation layer is arranged, and the through hole of described second electric insulation layer is positioned at the position relative with the through hole of the through hole of described first electric insulation layer and described 3rd electric insulation layer.
10. common-mode signal filter according to claim 6, is characterized in that, the material of the insulated substrate of described non magnetic material is aluminium oxide, aluminium nitride, glass or quartz.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1622232A (en) * | 2003-11-28 | 2005-06-01 | Tdk株式会社 | Thin-film common mode filter and thin-film common mode filter array |
| CN1835132A (en) * | 2005-03-18 | 2006-09-20 | Tdk株式会社 | Common-mode choke coil |
| CN101615479A (en) * | 2008-05-16 | 2009-12-30 | Tdk株式会社 | Common-mode filter |
| TW201106386A (en) * | 2009-08-03 | 2011-02-16 | Inpaq Technology Co Ltd | Common mode filter and method of manufacturing the same |
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| TW201201523A (en) * | 2010-06-28 | 2012-01-01 | Inpaq Technology Co Ltd | Thin type common mode filter and method of manufacturing the same |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1622232A (en) * | 2003-11-28 | 2005-06-01 | Tdk株式会社 | Thin-film common mode filter and thin-film common mode filter array |
| CN1835132A (en) * | 2005-03-18 | 2006-09-20 | Tdk株式会社 | Common-mode choke coil |
| CN101615479A (en) * | 2008-05-16 | 2009-12-30 | Tdk株式会社 | Common-mode filter |
| TW201106386A (en) * | 2009-08-03 | 2011-02-16 | Inpaq Technology Co Ltd | Common mode filter and method of manufacturing the same |
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