WO2005117037A1 - コモンモードノイズフィルタ - Google Patents
コモンモードノイズフィルタ Download PDFInfo
- Publication number
- WO2005117037A1 WO2005117037A1 PCT/JP2005/009421 JP2005009421W WO2005117037A1 WO 2005117037 A1 WO2005117037 A1 WO 2005117037A1 JP 2005009421 W JP2005009421 W JP 2005009421W WO 2005117037 A1 WO2005117037 A1 WO 2005117037A1
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- WO
- WIPO (PCT)
- Prior art keywords
- conductor
- insulating layer
- common mode
- noise filter
- mode noise
- Prior art date
Links
- 239000004020 conductor Substances 0.000 claims abstract description 345
- 239000000696 magnetic material Substances 0.000 claims abstract description 64
- 239000000463 material Substances 0.000 claims abstract description 20
- 230000005291 magnetic effect Effects 0.000 claims description 92
- 238000000605 extraction Methods 0.000 claims description 69
- 239000011810 insulating material Substances 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 33
- 238000007747 plating Methods 0.000 description 27
- 230000008878 coupling Effects 0.000 description 21
- 238000010168 coupling process Methods 0.000 description 21
- 238000005859 coupling reaction Methods 0.000 description 21
- 229910052709 silver Inorganic materials 0.000 description 16
- 239000004332 silver Substances 0.000 description 16
- 229910000859 α-Fe Inorganic materials 0.000 description 15
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 229910017518 Cu Zn Inorganic materials 0.000 description 6
- 229910017752 Cu-Zn Inorganic materials 0.000 description 6
- 229910017943 Cu—Zn Inorganic materials 0.000 description 6
- TVZPLCNGKSPOJA-UHFFFAOYSA-N copper zinc Chemical compound [Cu].[Zn] TVZPLCNGKSPOJA-UHFFFAOYSA-N 0.000 description 6
- 239000002241 glass-ceramic Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000005012 migration Effects 0.000 description 5
- 238000013508 migration Methods 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
- H01F2017/0026—Multilayer LC-filter
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F2017/0093—Common mode choke coil
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0021—Constructional details
- H03H2001/0085—Multilayer, e.g. LTCC, HTCC, green sheets
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H2001/0092—Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter
Definitions
- the present invention relates to a small multilayer common mode noise filter used for various electronic devices.
- FIG. 16 is an exploded perspective view of a conventional common mode noise filter 1001 disclosed in Japanese Patent Application Laid-Open No. 2000-190410.
- Insulating layer 1A- Spiral conductors 2A, 2B, 3A, 3B containing metal are provided on the upper surface of each LD.
- the conductor 2A and the conductor 2B are connected via the via electrode 4A to form the coil 2, and the conductor 3A and the conductor 3B are connected via the via electrode 4B to form the coil 3.
- An insulating layer 5 made of magnetic material is provided on the lower surface of the insulating layer 1A and the upper surface of the conductor 3B.
- the insulating layers 1B to 1D are made of a non-magnetic material, and the insulating layers 1A and 5 are made of a magnetic material.
- the conductor 2B and the conductor 3A facing each other via the insulating layer 1C are magnetically coupled. As a result, the coil 2 and the coil 3 have a large impedance with respect to the common mode component of the signal passing therethrough, and remove noise of the common mode component.
- the common mode noise filter 1001 when the insulating layer 1C is thin, poor insulation or poor connection between the conductor 2B and the conductor 3A, that is, between the coil 2 and the coil 3 provided through the insulating layer 1C. Metal migration of conductor 3A may occur.
- the insulating layer 1B and the insulating layer ID are thick, the distance between the insulating layer 1A and the conductor 2B and the distance between the insulating layer 5 provided on the upper surface of the conductor 1D and the conductor 3A become longer. In some cases, the magnetic field generated in the insulating layer 5 is not effectively used, and the impedance of the coils 2 and 3 with respect to the common mode component cannot be increased.
- FIG. 17 is an exploded perspective view of a conventional common mode noise filter 1002 disclosed in Japanese Patent Application Laid-Open No. 2001-76930.
- Conductors 502A, 502B, 503A, and 503B are provided on the upper surfaces of the insulating layers 501A to 501D.
- the conductor 502A and the spiral conductor 502B are connected via the via electrode 504A to form the coil 502, and the conductor 503A and the conductor 503 are connected.
- B are connected via a via electrode 504B to form a coil 503.
- An insulating layer 501E made of a magnetic material is provided on the upper surface of the conductor 503B.
- On insulating layers 501B to 501D made of a nonmagnetic material, magnetic portions 505 are provided inside the spiral shapes of conductors 502B and 503A, respectively.
- the coils 502 and 503 have a large impedance with respect to the common mode component of the signal passing therethrough, and remove the common mode noise.
- the magnetic part 505 strengthens the magnetic field intersecting between the coil 502 and the coil 503, increases the impedance of the coils 502 and 503 with respect to the common mode component, and can largely remove the common mode noise.
- one magnetic portion 505 is provided for each of the insulating layers 501B to 50ID made of a nonmagnetic material.
- the magnetic portion 505 is formed by forming holes in the insulating layers 501B to 501D, filling a paste-like magnetic material, and thermosetting.
- the magnetic material in the form of a paste is susceptible to the effect of surface tension during filling, so that the filling amount of the magnetic portion 505 becomes smaller than the volume of the hole.
- the common mode noise filter includes a first insulating layer made of a magnetic material, a first conductor provided on the first insulating layer, and a nonmagnetic material provided on the first conductor.
- the second conductor and the first conductor constitute a first coil.
- the fourth conductor and the third conductor constitute a second coil.
- the third insulating layer is thicker than the second and fourth insulating layers.
- FIG. 1 is an exploded perspective view of a common mode noise filter according to Embodiment 1 of the present invention.
- FIG. 2 is a perspective view of a common mode noise filter according to Embodiment 1.
- FIG. 3 is an exploded perspective view of another common mode noise filter according to Embodiment 1.
- FIG. 4 is an exploded perspective view of still another common mode noise filter according to Embodiment 1.
- FIG. 5 shows the relationship between the thickness of the insulating layer of the common mode noise filter and the coupling coefficient of the coil in the first embodiment.
- FIG. 6 shows the relationship between the thickness of the insulating layer of the common mode noise filter and the occurrence rate of insulation failure in the first embodiment.
- FIG. 7 is an exploded perspective view of a common mode noise filter according to Embodiment 2 of the present invention.
- FIG. 8 is a perspective view of a common mode noise filter according to Embodiment 2.
- FIG. 9 is a perspective view of a main part of another common mode noise filter according to the second embodiment.
- FIG. 10 is a perspective view of a main part of still another common mode noise filter according to Embodiment 2.
- FIG. 11 is a perspective view of a main part of still another common mode noise filter according to the second embodiment.
- FIG. 12 is an exploded perspective view of still another common mode noise filter according to the second embodiment.
- FIG. 13 is an exploded perspective view of a common mode noise filter according to Embodiment 3 of the present invention.
- FIG. 14 is an exploded perspective view of a common mode noise filter according to Embodiment 4 of the present invention.
- FIG. 15 is a graph showing the relationship between the thickness of the insulating layer and the thickness of the common mode noise filter according to the second embodiment.
- FIG. 16 is an exploded perspective view of a conventional common mode noise filter.
- FIG. 17 is an exploded perspective view of a conventional common mode noise filter.
- Insulation layer (first insulation layer)
- Insulation layer (second insulation layer)
- Insulation layer (third insulation layer)
- FIG. 2 is an exploded perspective view of the common mode noise filter 101 in FIG. 1 and the first embodiment of the present invention.
- the common mode noise filter 101 is provided on the conductor 12 provided on the upper surface 11A of the insulating layer 11, the insulating layer 13 provided on the upper surface 22A of the conductor 12, and on the upper surface 13A of the insulating layer 13.
- the lower surface 13B of the insulating layer 13 is located on the upper surface 12C of the conductor 12.
- the lower surface 15B of the insulating layer 15 is located on the upper surface 14C of the conductor 14.
- the lower surface 17B of the insulating layer 17 is located on the upper surface 16C of the conductor 16.
- the lower surface 19B of the insulating layer 19 is located on the upper surface 18C of the conductor 18.
- the insulating layers 11 and 19 are formed of a magnetic material, and the insulating layers 13, 15 and 17 are formed of a non-magnetic material.
- the insulating layer 15 is thicker than the insulating layers 13 and 17.
- the insulating layer 11 is formed in a sheet shape from a magnetic material such as FeO-based ferrite.
- the conductor 12 is formed on the upper surface 11A of the insulating layer 11 by plating a conductive material such as silver. Is done. To one end 12B of the conductor 12, an extraction electrode 22 exposed to a side 11C of the insulating layer 11 is connected.
- the insulating layer 13 is made of a nonmagnetic material such as Cu-Zn ferrite or glass ceramic, and has an insulating property.
- a via electrode 23 penetrating between the upper surface 13A and the lower surface 13B of the insulating layer 13 is formed.
- the via electrode 23 is connected to the other end 12A of the conductor 12.
- the conductor 14 is formed on the upper surface 13A of the insulating layer 13 by applying a conductive material such as silver in a spiral shape.
- One end 14B of the conductor 14 is connected to the bow I output electrode 24 exposed on the side 13C of the insulating layer 13.
- the other end 14A of the conductor 14 is located inside the spiral shape and is connected to the via electrode 23.
- the other end 12A of the conductor 12 and the other end 14A of the conductor 14 are electrically connected via the via electrode 23, and a coil 20 including the conductor 12 and the conductor 14 is formed.
- the insulating layer 15 is made of a nonmagnetic material such as Cu—Zn ferrite or glass ceramic and has a sheet-like shape and has insulating properties.
- the insulating layer 15 is thicker than the insulating layers 13 and 17.
- the conductor 16 is formed on the upper surface 15A of the insulating layer 15 by applying a conductive material such as silver in a spiral shape.
- a lead electrode 25 exposed on a side portion 15C of the insulating layer 15 is connected to one end portion 16B of the conductor 16.
- the insulating layer 17 is made of a nonmagnetic material such as Cu—Zn ferrite or glass ceramic and has a sheet-like shape and has insulating properties.
- a via electrode 26 is formed at the center of the insulating layer 17 so as to penetrate between the upper surface 17A and the lower surface 17B of the insulating layer. The via electrode 26 is connected to the other end 16A of the conductor 16 located inside the spiral shape of the conductor 16.
- the conductor 18 is provided on the upper surface 17A of the insulating layer 17 by plating a conductive material such as silver.
- a lead electrode 27 exposed at a side portion 17C of the insulating layer 17 is connected to one end portion 18B of the conductor 18.
- the other end 18A of the conductor 18 is connected to the via electrode 26.
- the other end 16A of the conductor 16 and the other end 18A of the conductor 18 are electrically connected via the via electrode 26, and a coil 21 including the conductor 16 and the conductor 18 is formed.
- the conductor 16 is opposed to and overlaps the conductor 14 with the insulating layer 15 interposed therebetween. Therefore, the conductor 16 exerts a magnetic influence on each other, and the coil 20 is magnetically coupled to the coil 21. This allows The channels 20 and 21 have a large impedance with respect to the common mode component of the current (signal) flowing through them. By making the conductors 14 and 16 spiral, the impedance of the coils 20 and 21 can be increased.
- the via electrodes 23 and 26 are formed by filling holes passing through the insulating layers 13 and 17 with a conductive material such as silver, respectively.
- the insulating layer 19 is formed in a sheet shape from a magnetic material such as ferrite based on FeO.
- the insulating layers 13, 15, 17 made of a non-magnetic material may be formed of a ferrite-based non-magnetic material.
- the insulating layers 11 and 19 made of a ferrite-based magnetic material are strongly bonded and the stable filter 101 is obtained.
- Sheet-shaped dummy insulating layers 28A and 28B are provided on lower surface 11B of insulating layer 11 and upper surface 19A of insulating layer 19, respectively.
- the dummy insulating layers 28A and 28B have insulating properties, but may be made of either a magnetic material or a non-magnetic material.
- the number of the insulating layers 11, 13, 15, 17, 19 and the number of the insulating layers 28A and 28B are not limited to those shown in FIG.
- FIG. 2 is a perspective view of the common mode noise filter 101.
- the above-described insulating layer and dummy insulating layer, conductor, lead electrode, and via electrode form the noise filter main body 29.
- External electrodes 31 and 32 are provided on the side surface 29A of the noise filter main body 29, and external electrodes 30 and 33 are provided on the side surface 29B.
- the outer electrodes 30, 31, 32, and 33 are connected to the extraction electrodes 22, 24, 25, and 27, respectively.
- the conductor 14 and the conductor 16 that magnetically affect each other have a spiral shape, the portions that magnetically influence each other are long. Since the conductors 12, 14, 16, 18 that constitute the coils 20, 21 and generate a magnetic field are provided on the insulating layers 13, 15, 17 made of a nonmagnetic material, leakage of magnetic flux can be reduced. As a result, the magnetic coupling between the coils 20 and 21 is strengthened, and the magnetic field penetrating the insulating layers 11 and 19 made of a magnetic material can be effectively used. As a result, the common mode of the current flowing through the coils 20 and 21 The impedance for the component can be increased.
- the shapes of the conductors 12 and 18 are not particularly limited as long as the impedance of the common mode component is not reduced. As shown in Fig. 1, the conductors 12 and 18 are formed in a spiral shape like conductors 14 and 16 so as to reduce differential components. The impedance of the common mode component increases accordingly.
- the extraction electrodes 22, 24, 25, and 27 are formed of the same conductive material such as silver at the same time as the conductors 12, 14, 16, and 18, and are preferably S.
- the conductors 12, 14, 16, 18 and the extraction electrodes 22, 24, 25, 27 may be formed by other printing or vapor deposition methods instead of plating.
- FIG. 3 is an exploded perspective view of another common mode noise filter 102 according to the first embodiment.
- a magnetic part 34 made of a magnetic material is provided in the insulating layer 15 inside the spiral shape of the conductor 1416 of the insulating layer 15.
- the magnetic portion 34 is formed inside the innermost portions 14D and 16D of the spiral-shaped conductors 14 and 16, and does not contact the conductors 14 and 16.
- the magnetic part 34 can strengthen the magnetic field crossing between the conductor 14 and the conductor 16, that is, between the coil 20 and the coil 21 magnetically coupled to each other, and increases the impedance of the coils 20 and 21 with respect to the common mode component. it can.
- the magnetic part 34 that can strengthen the magnetic field crossing between the coil 20 and the coil 21 can increase the magnetic coupling between the coils 20 and 21. It is valid.
- the magnetic part 34 and the via electrodes 23 and 26 can be easily formed.
- a plurality of magnetic parts having the same structure as the magnetic part 34 may be formed in a part provided in the magnetic part 34.
- FIG. 4 is an exploded perspective view of still another common mode noise filter 103 according to the first embodiment.
- a via electrode 126 connected to the via electrode 26 is formed in the insulating layer 13 at a position corresponding to the via electrode 26 formed on the insulating layer 15.
- conductor 118 having end 118A connected to via electrode 126 is provided on upper surface 11A of insulating layer 11.
- An extraction electrode 127 is connected to the end 118B of the conductor 118. The extraction electrode 127 is exposed on the side portion 11C of the insulating layer 11 where the extraction electrode 22 is exposed.
- the extraction electrode 22 and 27 are located on the same surface, that is, on the upper surface 11A of the insulating layer 11, the extraction electrode 22 can be magnetically coupled to the extraction electrode 27. Thereby, the magnetic coupling between the coil 20 and the coil 21 is strengthened, so that the impedance with respect to the common mode component can be further increased. [0030]
- the width of the extraction electrodes 22, 24, 25, and 27 may be wider than the width of the conductors 12, 14, 16, and 18! As a result, the magnetic influence of a portion that does not contribute to the magnetic coupling between the coil 20 and the coil 21 can be reduced, so that the impedance with respect to the common mode component can be further increased.
- each of the conductors 12 and 18 may be wider than the width of the conductors 14 and 16. In this case, since the impedance with respect to the differential mode component generated in the conductors 12 and 18 can be reduced, the impedance with respect to the common mode components of the coils 20 and 21 can be further increased.
- a predetermined number of rectangular insulating layers 11, 13, 15, 17, 19 and dummy insulating layers 28 #, 28 # are formed from a mixture of powders of a magnetic material or a non-magnetic material as a raw material and a resin.
- the insulating layer 15 is made thicker than the insulating layers 13 and 17. Holes are formed in predetermined portions of the insulating layers 13 and 17 by laser, punching, or the like, and the holes are filled with a conductive material such as silver to form via electrodes 23 and 26.
- the insulating layer 11 is disposed on the dummy insulating layer 28.
- the conductor 12 and the lead electrode 22 are formed on the upper surface 11A of the insulating layer 11 by plating.
- the insulating layer 13 provided with the via electrode 23 is disposed on the upper surface 12C of the conductor 12.
- the spiral conductor 14 and the extraction electrode 24 are formed on the upper surface 13A of the insulating layer 13 by plating.
- the other end 14A of the conductor 14 is connected to the via electrode 23.
- the insulating layer 15 is disposed on the upper surface 14C of the conductor 14.
- the spiral conductor 16 and the extraction electrode 25 are formed on the upper surface 15A of the insulating layer 15 by plating.
- the insulating layer 17 provided with the noisy electrode 26 is arranged. At this time, the other end 16A of the conductor 16 and the via electrode 26 are connected.
- the conductor 18 and the extraction electrode 27 are formed on the upper surface 17A of the insulating layer 17 by plating. At this time, the other end 18A of the conductor 18 and the via electrode 26 are connected.
- Conductors 12, 14, 16, and 18 are formed by plating conductors of a predetermined pattern on a separately prepared base plate (not shown), and then transferring these conductors to each insulating layer. Is formed.
- the insulating layer 19 is disposed on the upper surface 18A of the conductor 18. Then, the upper surface 19A of the insulating layer 19 is The noise filter body 29 is formed by disposing the Mie insulating layer 28B.
- a plurality of conductors 12, 14, 16, and 18 are provided on a large insulating layer wafer, respectively, and then the wafer is cut and simultaneously a plurality of noise filters are provided. You can get the body 29!
- the noise filter main body 29 is fired at a predetermined temperature for a predetermined time.
- silver is printed on the side surfaces 29A and 29B of the noise filter main body 29, and the extraction electrodes 22 and
- a nickel plating layer is formed on the surfaces of the external electrodes 30, 31, 32, and 33 by plating, and a low-melting metal plating layer such as tin or solder is formed on the surface of the nickel plating layer by plating.
- the insulating layer 15 is thicker than the insulating layer 13 and the insulating layer 17, so that the conductor 14 and the conductor 16 facing each other via the insulating layer 15 Insulation failure or migration between the coils, that is, between the coil 20 and the coil 21, can be prevented. Furthermore, since the insulating layers 13 and 17 can be made thinner, the distance between the insulating layer 11 and the conductor 14 and the distance between the insulating layer 19 and the conductor 16 can be reduced. As a result, the magnetic field generated in the insulating layers 11 and 19 made of a magnetic material can be effectively used, and as a result, the impedance of the coils 20 and 21 for the common mode component can be increased.
- FIG. 5 shows the relationship between the thickness of insulating layer 13 and insulating layer 17 of common mode noise filter 101 and the coupling coefficient between coils 20 and 21 in the first embodiment.
- a common mode noise filter having the structure shown in Fig. 1 with the thickness of the insulating layer 15 set to 24 m was manufactured.
- the larger the coupling coefficient the larger the impedance of the coils 20 and 21 to the common mode component.
- a sample having a coupling coefficient of 0.94 or less was determined to be defective.
- the thickness of the insulating layers 13 and 17 needs to be 20 m or less. If the thickness of the insulating layers 13 and 17 is larger than 20 m, the magnetic field of the insulating layers 11 and 19 made of a magnetic material cannot be effectively used.
- the lower limit of the thickness of the insulating layers 13 and 17 may be appropriately determined according to the required characteristics, but is preferably 5 m or more in consideration of ease of handling. At this time, insulation Even if the layer 13 is thinner than 20 / zm, since the conductors 12 and the conductors 14 provided on the upper and lower surfaces of the insulating layer 13 have the same potential, no insulation failure occurs. Similarly, even if the insulating layer 17 is thinner, since the conductors 16 and 18 provided on the upper and lower surfaces of the insulating layer 17 have the same potential, no insulation failure occurs.
- FIG. 6 shows the relationship between the thickness of insulating layer 15 of the common mode noise filter and the occurrence rate of insulation failure in the first embodiment.
- a common mode noise filter having the structure shown in FIG. 1 in which the thickness of the insulating layers 13 and 17 was 17111 was manufactured.
- Ambient temperature 125 ° C, humidity 85%, insulation resistance by applying a voltage of 5V was poor the following: 10 7 Omega between coils 20, 21 in succession under the conditions of pressure 2 atm.
- the thickness force S of the edge layer 15 is 17 m, 20 ⁇ , and 24 ⁇ m, respectively.
- the insulation failure occurred in sample S1 after 36 hours, but the insulation failure did not occur in samples S2 and S3 after 60 hours. That is, the thickness of the insulating layer 15 needs to be 20 ⁇ m or more. If the thickness of the insulating layer 15 is thinner than 20 ⁇ m, the possibility that not only insulation failure between the conductor 14 and the conductor 16 but also migration or the like will occur is increased.
- the upper limit of the thickness of the insulating layer 15 may be appropriately determined according to the required characteristics. For example, considering the magnetic coupling between the coil 20 and the coil 21 and the thickness of the filter main body 29, for example, 100 ⁇ m It is preferable to set the following.
- the common mode noise filters 101 to 103 in the first embodiment may be an array type in which a single coil 20 and a single coil 21 are provided, and a plurality of coils 21 and 21 are provided.
- FIG. 7 is an exploded perspective view of a common mode noise filter 1501 according to Embodiment 2 of the present invention.
- the common mode noise filter 1501 is provided on a conductor 512 provided on the upper surface 511A of the insulating layer 511, an insulating layer 513 provided on the upper surface 512C of the conductor 512, and provided on the upper surface 513A of the insulating layer 513.
- Insulating layer 517 and the top surface of the insulating layer 517 5 A conductor 518 provided on 17A and an insulating layer 519 provided on an upper surface 518C of the conductor 518 are provided. Conductor 518 is connected to conductor 512, and conductor 518 is connected to conductor 516. That is, the lower surface 513B of the insulating layer 513 is located on the upper surface 512C of the conductor 512. The lower surface 515B of the insulating layer 515 is located on the upper surface 514C of the conductor 514. The lower surface 517B of the insulating layer 517 is located on the upper surface 5 16C of the conductor 516.
- the lower surface 519B of the insulating layer 519 is located on the upper surface 518C of the conductor 518.
- the conductors 512 and 514 constitute a coil 520 force
- the conductor 516 and the conductor 518 constitute a coil 521.
- the insulating layers 511, 519 are formed of a magnetic material
- the insulating layers 513, 515, 517 are formed of a non-magnetic material.
- a plurality of magnetic portions 522 having a magnetic material force are provided inside the spiral shape of the conductors 514 and 516.
- the insulating layer 511 is formed in a sheet shape from a magnetic material such as FeO-based ferrite.
- the conductor 512 is formed by plating a conductive material such as silver, and is provided on the upper surface 511 A of the insulating layer 511.
- An extraction electrode 523 exposed on a side portion 511C of the insulating layer 511 is connected to one end portion 512B of the conductor 512.
- the insulating layer 513 is made of a non-magnetic material such as Cu—Zn ferrite or glass ceramic, has a sheet-like shape, has insulating properties, and is provided on the upper surface 512 C of the conductor 512.
- a via electrode 524 is formed to penetrate between the upper surface 513A and the lower surface 513B of the insulating layer 513. The via electrode 524 is connected to the other end portion 512A of the conductor 512.
- the conductor 514 is formed by plating a conductive material such as silver in a spiral shape, and is provided on the upper surface 513 A of the insulating layer 513.
- the extraction electrode 525 exposed on the side 513C of the insulating layer 513 is connected to one end 514B of the conductor 514.
- the other end 514A of the conductor 514 located inside the spiral shape of the conductor 514 is connected to the via electrode 524, and the other end 512A of the conductor 512 and the other end 514A of the conductor 514 are connected via the via electrode 524. Electrically connected.
- a coil 520 including the conductor 512 and the conductor 514 is formed.
- the insulating layer 515 is made of a nonmagnetic material such as Cu—Zn ferrite or glass ceramic, has a sheet-like shape, has insulating properties, and is provided on the upper surface 514A of the conductor 514.
- the magnetic part 522 is formed by filling a hole penetrating the insulating layer 515 with a magnetic material such as FeO-based ferrite.
- the magnetic portion 522 is located inside the innermost portion 5 14D, 516D of the spiral-shaped conductors 514, 516 and does not contact the conductors 514 and 516.
- the number of the plurality of magnetic parts 522 is not limited to four, and it is not necessary to penetrate the insulating layer 515.
- the filter 1501 can be manufactured at low cost. Furthermore, by not providing both the magnetic part 522 and the via electrodes 524 and 527 made of different materials in one insulating layer, the magnetic part 522 and the via electrodes 524 and 527 can be easily formed.
- the conductor 516 is formed by plating a conductive material such as silver in a spiral shape, and is provided on the upper surface 515A of the insulating layer 515. To one end 516B of the conductor 516, an extraction electrode 526 exposed to a side 515C of the insulating layer 515 is connected. Most of the conductor 516 overlaps with the conductor 514 via the insulating layer 515.
- the insulating layer 517 is made of a nonmagnetic material such as Cu-Zn ferrite or glass ceramic, has a sheet-like shape, has insulating properties, and is provided on the upper surface 516C of the conductor 516.
- a via electrode 527 penetrating between the upper surface 517A and the lower surface 517B of the insulating layer 517 is formed.
- the via electrode 527 is connected to the other end 516A of the conductor 516 located inside the spiral shape of the conductor 516.
- the insulating layer 515 is thicker than the insulating layers 513 and 517.
- the conductor 518 is formed by plating a conductive material such as silver, and is provided on the upper surface 517A of the insulating layer 517. One end 518B of the conductor 518 is connected to the bow I output electrode 528 exposed on the side 517C of the insulating layer 517. The other end 518A of the conductor 518 located inside the spiral shape of the conductor 518 is connected to the via electrode 527, and the conductor 516 and the conductor 518 are electrically connected. Thus, the conductors 516 and 518 form the coil 521. Since the conductors 514 and 516 are formed in a spiral shape, the impedance of the coils 520 and 521 is reduced. Can be larger.
- the via electrodes 524 and 527 are formed by filling holes penetrating the insulating layers 513 and 517 with a conductor such as silver, respectively.
- the insulating layer 519 is formed in a sheet shape from a magnetic material such as ferrite based on FeO.
- the insulating layers 513, 515, and 517 By forming the insulating layers 513, 515, and 517 from a ferrite-based non-magnetic material, the insulating layers 511, 519 made of a ferrite-based magnetic material can be baked simultaneously with the insulating layers 511, 519, and can be joined firmly. 1501 is obtained.
- Dummy insulating layers 529A and 529B are provided on the lower surface 511B of the insulating layer 511 and the upper surface 519A of the insulating layer 519, respectively.
- the dummy insulating layers 529A and 529B are formed in a sheet shape and have insulating properties, but may be formed of either a magnetic material or a non-magnetic material.
- the number of insulating layers 5151, 513, 515, 517, 519 and dummy insulating layers 529, 529B is not limited to the number shown in FIG.
- FIG. 8 is a perspective view of the common mode noise filter 1501.
- the noise filter main body 530 is formed by the insulating layer, the conductor, the extraction electrode, and the dummy insulating layer.
- the outer electrodes 531, 532, 533, 534 are provided on the 530A and 530B surfaces of the noise filter body 530.
- the external electrodes 531, 532, 533, and 534 are connected to the extraction electrodes 523, 525, 526, and 528, respectively.
- the conductor 514 and the conductor 516 that exert a magnetic influence on each other have a spiral shape, the portions that magnetically affect each other become longer. Further, the magnetic field of the insulating layers 511 and 519 made of a magnetic material can be effectively used, and as a result, the impedance of the coils 520 and 521 with respect to the common mode component can be increased.
- the shapes of the conductors 512 and 518 are not particularly limited as long as the impedance with respect to the common mode component is not reduced. As shown in FIG. 7, since the conductors 512 and 518 are formed not in the shape of a wound like conductors 514 and 516 but in a straight line, the impedance with respect to the differential component of the current flowing through the coils 520 and 513 decreases. The impedance for the common mode component can be increased by that much.
- the extraction electrodes 523, 525, 526, 528 are preferably formed at the same time by depositing the same conductive material as silver as the conductors 512, 514, 516, 518. Conductors 512, 514, 516, 5 The 18 and the extraction electrodes 523, 525, 526, 528 may be formed by other methods such as printing or vapor deposition, instead of the plating.
- a predetermined number of rectangular insulating layers 511, 513, 515, 517, 519 and dummy insulating layers 529, 5 Prepare 29B. Holes are formed in predetermined portions of the insulating layers 513 and 517 by laser, punching, or the like, and the holes are filled with silver to form via electrodes 524 and 527, respectively. A plurality of holes are formed in the center of the insulating layer 515, and the holes are filled with a paste-like magnetic material to form a plurality of magnetic portions 522.
- an insulating layer 511 is provided over the dummy insulating layer 529A.
- a conductor 512 and an extraction electrode 523 are formed on the upper surface 511A of the insulating layer 511 by plating.
- the insulating layer 513 provided with the via electrode 524 is arranged on the upper surface 512C of the conductor 512.
- the other end 512A of the conductor 512 and the via electrode 524 are connected.
- a spiral conductor 514 and an extraction electrode 525 are formed on the upper surface 513A of the insulating layer 513 by plating. At this time, the other end 514A of the conductor 514 is connected to the via electrode 524.
- the insulating layer 515 on which the magnetic part 522 is formed is arranged.
- a spiral conductor 516 and an extraction electrode 526 are formed on the upper surface 515A of the insulating layer 515 by plating.
- the magnetic portion 522 is located inside the spiral shape of the innermost portions 514D and 514D of the conductors 514 and 516, respectively.
- an insulating layer 517 provided with a via electrode 527 is disposed on the upper surface 516C of the conductor 516.
- the other end 516A of the conductor 516 is connected to the via electrode 527.
- the conductor 518 and the extraction electrode 528 are formed on the upper surface 517A of the insulating layer 517 by plating. At this time, the other end 518A of the conductor 518 is connected to the via electrode 527.
- the conductors 512, 514, 516, and 518 are formed by plating a conductor having a predetermined pattern on a separately prepared base plate (not shown), and then transferring the conductor to each insulating layer. Form.
- an insulating layer 519 is arranged on the upper surface 518C of the conductor 518, and then, on the insulating layer 519, A dummy insulating layer 529B is arranged on the surface 519A to form the noise filter main body 530.
- the wafer may be cut to obtain a plurality of noise filter main portions 530 at the same time.
- the noise filter body 530 is fired at a predetermined temperature and time.
- silver is printed on the side surfaces 530A and 530B of the noise filter main body 530, and the extraction electrodes are formed.
- External electrodes 531, 532, 533, and 534 connected to 523, 525, 526, and 528, respectively, are formed.
- a nickel plating layer is formed on the surfaces of the external electrodes 531, 532, 533, and 534 by plating, and a low-melting metal plating layer such as tin or solder is further plated on the surface of the nickel plating layer.
- a plurality of magnetic portions 522 having a magnetic material force are provided in a portion of the insulating layer 515 inside the spiral shape of the conductors 514 and 516.
- the diameter of the hole for providing the magnetic portion 522 is reduced, and the magnetic material in the form of a paste is less affected by surface tension during filling. Therefore, the filling amount of the magnetic material is almost equal to the volume of the hole, and almost no space is generated around the magnetic portion 522.
- the magnetic field crossing between the coil 520 and the coil 521 becomes strong, so that the impedance with respect to the common mode component of the current flowing through the coils 520 and 521 can be increased. Further, since almost no space is generated around the magnetic portion 522, cracks can be prevented.
- the conductors 512, 514, 516, and 518 that constitute the coils 520 and 521 and generate a magnetic field are provided on the insulating layers 513, 515, and 517 made of a non-magnetic material, so that leakage of magnetic flux can be reduced. .
- the magnetic coupling between the coil 520 and the coil 521 is strengthened, so that the impedance of the coil 520 and the coil 521 with respect to the common mode component can be further increased.
- FIG. 9 is a perspective view of insulating layer 5515 of another common mode noise filter according to the second embodiment.
- This filter includes an insulating layer 5515 instead of the insulating layer 515 of the filter 1501.
- the other end 5516A located inside the spiral conductor 5516 is surrounded by a plurality of magnetic portions 522.
- the inner portion of the spiral shape of the conductor 5516 can be extended, so that the conductors that magnetically influence each other via the insulating layer 5515 can be extended by the length of the extended portion, and the impedance to the common mode component can be increased. Can be further increased.
- FIG. 10 is a perspective view of an insulating layer 515 of still another common mode noise filter according to the second embodiment.
- a magnetic part 522A is also provided outside the spiral shape of the conductors 514 and 516.
- the magnetic portion 522A is provided outside the outermost portion 561E of the spiral shape of the conductor 516, that is, provided around the insulating layer 515.
- the magnetic portions 522A are provided on the four sides around the insulating layer 515, and the forces provided so as to be exposed from the insulating layer 515.They need not necessarily be provided on all four sides. Absent.
- the magnetic portion 522A may be provided continuously so as to surround the conductor 516.
- FIG. 11 is a perspective view of an insulating layer 6515 of still another common mode noise filter according to the second embodiment.
- This filter includes a dielectric insulating layer 6515 instead of the insulating layer 515 of the filter 1501.
- the magnetic portion 522B made of an insulating magnetic material is in contact with a part of the conductors 514 and 516. With this structure, the magnetic portion 522B can be enlarged, so that the impedance with respect to the common mode component can be further increased.
- FIG. 12 is an exploded perspective view of still another common mode noise filter 1502 according to the second embodiment.
- the magnetic part 522C is provided in the insulating layer 517.
- the magnetic part 522C may be continuous with the magnetic part 522 provided in the insulating layer 515, or may not be continuous.
- the magnetic portions 522 and 522C can further increase the magnetic field crossing between the coils 520 and 521, so that the impedance with respect to the common mode component can be further increased.
- the magnetic part 522C may be provided on the insulating layer 517 in the same manner as the force provided on the insulating layer 517. The same applies to both the insulating layers 513 and 517.
- a magnetic part may be provided.
- FIG. 13 is an exploded perspective view of a common mode noise filter 1503 according to Embodiment 3 of the present invention.
- the same parts as in the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.
- an extraction electrode 5528 is provided on the upper surface 511A of the insulating layer 511 provided with the extraction electrode 523 instead of the extraction electrode 528 shown in FIG.
- Via electrodes 527A, 527B are provided on force insulating layers 513, 515, respectively.
- the conductor 5518 and the extraction electrode 5528 are provided on the upper surface 511A of the insulating layer 511, and the other end 516A of the conductor 516 and the conductor 5518 are connected via the via electrodes 527 and 527B.
- the extraction electrodes 523 and 5528 are provided on the same upper surface 511A, the extraction electrode 523 can be magnetically coupled to the extraction electrode 5528. As a result, the magnetic coupling between the coil 520 and the coil 521 is strengthened, so that the impedance with respect to the common mode component can be further increased.
- the width of the extraction electrodes 523, 525, 526, 5528 may be wider than the width of the conductors 512, 514, 516, 518.
- the magnetic effects of the conductors 512, 514, 516, and 518, which are not related to the magnetic coupling between the coil 520 and the coil 521, can be reduced, so that the magnetically coupled portion can be combined with the conductor 514 and the conductor 516.
- the impedance with respect to the common mode component can be further increased.
- the width of conductors 512 and 5518 may be wider than the widths of conductors 514 and 516.
- the impedance of the conductor 512 and the conductor 518 with respect to the differential component of the current flowing therethrough can be reduced, so that the impedance of the coils 520 and 521 with respect to the common mode component can be further increased.
- FIG. 14 is an exploded perspective view of a common mode noise filter 1504 according to Embodiment 4 of the present invention.
- the same parts as those in Embodiment 2 shown in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted.
- the thickness of insulating layer 513 and insulating layer 517 is 20 m or less. This Accordingly, the distance between the insulating layer 511 and the conductor 514 and the distance between the insulating layer 519 and the conductor 516 can be reduced, and the magnetic field generated by the insulating layers 511 and 519 made of a magnetic material can be effectively used. , 521 can increase the impedance of the current flowing through them to the common mode component.
- the insulating layer 515 has a magnetic portion 522E made of a magnetic material. A plurality of magnetic units shown in FIG. 7 may be provided instead of the magnetic unit 522E.
- FIG. 15 shows the relationship between the thickness of insulating layers 513 and 517 of common mode noise filter 1504 and the coupling coefficient of coils 520 and 521 in the fourth embodiment.
- a common mode noise filter having the structure shown in FIG. 7 in which the thickness of the insulating layer 515 was 26 ⁇ m was manufactured.
- the larger the coupling coefficient the larger the impedance of the coils 520 and 521 with respect to the common mode component. Samples with a coupling coefficient of 0.96 or less were regarded as defective.
- the thickness of the insulating layers 513 and 517 should be set to 20 m or less. Thickness of insulating layers 513, 517 Thickness greater than 20 m! // Magnetic field passing through magnetic insulating layers 511, 519 cannot be used effectively.
- the coupling coefficient was high even when the insulating layer 515 was thick, and the coupling coefficient was almost the same as the sample in which the insulating layer 515 was thin.
- the lower limits of the thicknesses of the insulating layers 513 and 517 may be appropriately determined depending on the required characteristics, but are preferably, for example, 5 m or more in consideration of ease of handling.
- the insulating layer 515 is thicker than the insulating layers 513 and 517, poor insulation or migration between the conductor 514 and the conductor 516 provided via the insulating layer 515, that is, between the coil 520 and the coil 521, may occur. Can be prevented from occurring. Since the thickness of the insulating layers 513 and 517 can be reduced, the distance between the insulating layer 511 and the conductor 514 and the distance between the insulating layer 519 and the conductor 516 can be shortened. The magnetic field generated by the above can be effectively used. As a result, the impedance of the coils 520 and 521 with respect to the common mode component can be increased.
- the common mode noise filters 1501 to 1504 in Embodiments 2 to 4 each include one coil 20 and one coil 21, but may be an array type including a plurality of coils. ,.
- the common mode noise filter which concerns on this invention can prevent generation
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05743318A EP1635363A1 (en) | 2004-05-28 | 2005-05-24 | Common mode noise filter |
US10/562,557 US7119649B2 (en) | 2004-05-28 | 2005-05-24 | Common mode noise filter |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004-159142 | 2004-05-28 | ||
JP2004159143A JP4670262B2 (ja) | 2004-05-28 | 2004-05-28 | コモンモードノイズフィルタ |
JP2004159142A JP4626185B2 (ja) | 2004-05-28 | 2004-05-28 | コモンモードノイズフィルタ |
JP2004-159143 | 2004-05-28 |
Publications (1)
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WO2005117037A1 true WO2005117037A1 (ja) | 2005-12-08 |
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PCT/JP2005/009421 WO2005117037A1 (ja) | 2004-05-28 | 2005-05-24 | コモンモードノイズフィルタ |
Country Status (5)
Country | Link |
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US (1) | US7119649B2 (ja) |
EP (1) | EP1635363A1 (ja) |
KR (1) | KR100789040B1 (ja) |
TW (1) | TW200609956A (ja) |
WO (1) | WO2005117037A1 (ja) |
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- 2005-05-24 US US10/562,557 patent/US7119649B2/en not_active Expired - Fee Related
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Also Published As
Publication number | Publication date |
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US7119649B2 (en) | 2006-10-10 |
US20060158301A1 (en) | 2006-07-20 |
KR20060035785A (ko) | 2006-04-26 |
KR100789040B1 (ko) | 2007-12-26 |
EP1635363A1 (en) | 2006-03-15 |
TWI363360B (ja) | 2012-05-01 |
TW200609956A (en) | 2006-03-16 |
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