WO2016072078A1 - 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
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- WO2016072078A1 WO2016072078A1 PCT/JP2015/005492 JP2015005492W WO2016072078A1 WO 2016072078 A1 WO2016072078 A1 WO 2016072078A1 JP 2015005492 W JP2015005492 W JP 2015005492W WO 2016072078 A1 WO2016072078 A1 WO 2016072078A1
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- coil conductor
- common mode
- mode noise
- coil
- noise filter
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
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- 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
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/10—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material voltage responsive, i.e. varistors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/012—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material
- H01F1/015—Metals or alloys
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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
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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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
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/09—Filters comprising mutual inductance
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/42—Networks for transforming balanced signals into unbalanced signals and vice versa, e.g. baluns
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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- H01—ELECTRIC ELEMENTS
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- H01F17/00—Fixed inductances of the signal type
- H01F2017/0093—Common mode choke coil
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- 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
Definitions
- the present invention relates to a small and thin common mode noise filter used for various electronic devices such as digital devices, AV devices, and information communication terminals.
- FIG. 16 shows a conventional common mode noise filter 500.
- the conventional common mode noise filter 500 is formed by laminating the insulator layers 1a to 1g, and the coil 2 and the coil 3 are formed on the upper surfaces of the insulator layers 1b to 1e, respectively.
- the coil 2 includes a spiral coil conductor 4a and a spiral coil conductor 4b.
- the coil conductor 4a and the coil conductor 4b are connected to each other.
- the coil 3 includes a spiral coil conductor 5a and a spiral coil conductor 5b.
- the coil conductor 5a and the coil conductor 5b are connected to each other.
- the coil conductors 4a and 4b constituting the coil 2 and the coil conductors 5a and 5b constituting the coil 3 are alternately arranged.
- the coil conductor 4a and the coil conductor 5a are magnetically coupled to each other to form a common mode filter 6.
- the coil conductor 4b and the coil conductor 5b are magnetically coupled to each other to form the common mode filter 7.
- the common mode noise filter is formed on the top surfaces of the first to fifth insulator layers, the spiral first coil conductor formed on the top surface of the first insulator layer, and the second insulator layer. And a first coil having a spiral second coil conductor provided below the first coil conductor. Furthermore, a spiral third coil conductor formed on the upper surface of the third insulator layer and a spiral coil formed on the upper surface of the fourth insulator layer and provided below the third coil conductor. A second coil having a fourth coil conductor is provided. Furthermore, a first metal layer formed on the upper surface of the fifth insulator layer, first to fourth external electrodes connected to the first to fourth coil conductors, and a first metal A fifth external electrode connected to the layer and provided to connect to the ground.
- a third coil conductor is provided between the first coil conductor and the second coil conductor, and a second coil conductor is provided between the third coil conductor and the fourth coil conductor.
- the coil conductor and the third coil conductor are magnetically coupled to each other to form a first common mode filter, and the second coil conductor and the fourth coil conductor are magnetically coupled to each other to form a second common mode filter.
- the first common mode filter is connected in series with the second common mode filter, and the first metal layer is provided above the first coil conductor.
- a first coil conductor is provided between the third coil conductor and the second coil conductor, and the first coil
- a second coil conductor may be provided between the conductor and the fourth coil conductor.
- the first, second, third, fourth and fifth externals You may further provide the 1st static electricity passage part electrically connected with the electrode.
- the second static electricity passing portion that functions in the same manner as described above and is electrically connected to the first, second, and fifth external electrodes, and electrically connected to the third, fourth, and fifth external electrodes. And a third static electricity passage section connected thereto.
- the above-mentioned common mode noise filter can improve the attenuation characteristics of common mode noise particularly in a wide band.
- FIG. 1 is an exploded perspective view of the common mode noise filter according to the first embodiment.
- FIG. 2 is a perspective view of the common mode noise filter of FIG.
- FIG. 3 is a circuit schematic diagram of the common mode noise filter of FIG.
- FIG. 4 is a diagram comparing the attenuation characteristics of common mode noise between the common mode noise filter of FIG. 1 and a conventional common mode noise filter.
- FIG. 5 is an exploded perspective view of another common mode noise filter according to the first exemplary embodiment.
- FIG. 6 is an exploded perspective view of the common mode noise filter according to the second embodiment.
- FIG. 7 is a circuit schematic diagram of the common mode noise filter of FIG.
- FIG. 8 is a diagram comparing the common mode noise attenuation characteristics of the common mode noise filter of FIG. 6 and the conventional common mode noise filter.
- FIG. 9 is a diagram comparing the amplitude balance degrees of the differential signals of the common mode noise filter of FIG. 6 and the conventional common mode noise filter.
- FIG. 10 is a diagram comparing the phase balance of the differential signals of the common mode noise filter of FIG. 6 and the conventional common mode noise filter.
- FIG. 11 is a diagram comparing mode conversion characteristics of the common mode noise filter of FIG. 6 and a conventional common mode noise filter.
- FIG. 12 is an exploded perspective view of the common mode noise filter according to the third embodiment.
- FIG. 13 is a schematic circuit diagram of the common mode noise filter of FIG.
- FIG. 14 is an exploded perspective view of the common mode noise filter according to the fourth embodiment.
- FIG. 15 is a diagram comparing the common mode noise attenuation characteristics of the common mode noise filter of FIG. 14 and the conventional common mode noise filter.
- FIG. 16 is an exploded perspective view of a conventional common mode noise filter.
- the cellular radio system is used in a wide communication frequency band from 700 MHz to 3 GHz, and a noise attenuation characteristic in this communication frequency band is also desired for a noise filter.
- the common mode filter 6 and the common mode filter 7 function as inductors, and the coil conductor 4 a and the coil conductor 5 a are magnetized in the vertical direction. Join. Since the coil conductor 4b and the coil conductor 5b are magnetically coupled to each other in the vertical direction, the impedance between the input / output of the coil 2 and the input / output of the coil 3 in the common mode noise filter 500 is increased, and a potential difference is generated between the input and output. As a result, stray capacitance is generated between the input and output.
- FIG. 1 is an exploded perspective view of a common mode noise filter 1001 according to the first embodiment.
- FIG. 2 is a perspective view of the common mode noise filter 1001.
- the common mode noise filter 1001 includes insulator layers 11a to 11h, coils 12 and 13 formed on the top surfaces of the insulator layers 11b to 11e, and a ground surface on the top surface of the insulator layer 11g.
- the insulating layers 11a to 11h, the coil 12, the coil 13, and the metal layer 14 are stacked to form a stacked body 15 shown in FIG.
- the coil 12 has a spiral coil conductor 16 and a spiral coil conductor 17, and the coil conductor 16 and the coil conductor 17 are electrically connected to each other in series.
- the coil 13 has a spiral coil conductor 18 and a spiral coil conductor 19, and the coil conductor 18 and the coil conductor 19 are electrically connected to each other in series.
- the coil conductor 18 is provided between the coil conductor 16 and the coil conductor 17, and the coil conductor 17 is provided between the coil conductor 18 and the coil conductor 19.
- the coil conductors 16 to 19 are arranged in the order of the coil conductor 16, the coil conductor 18, the coil conductor 17, and the coil conductor 19 from above.
- the coil conductor 16 is formed on the upper surface of the insulator layer 11e, the coil conductor 17 is formed on the upper surface of the insulator layer 11c, the coil conductor 18 is formed on the upper surface of the insulator layer 11d, and the coil conductor 19 is formed on the insulator layer. It is formed on the upper surface of 11b.
- the coil conductor 16 and the coil conductor 17 of the coil 12 and the coil conductor 18 and the coil conductor 19 of the coil 13 are alternately arranged.
- the coil conductor 16 and the coil conductor 18 are magnetically coupled to each other to form a common mode filter 20, and the coil conductor 17 and the coil conductor 19 are magnetically coupled to each other to form a common mode filter 21.
- the common mode filter 20 and the common mode filter 21 are connected in series with each other.
- the metal layer 14 is formed above the coil conductor 16.
- the insulator layers 11a to 11h are sequentially stacked from the insulator layer 11a.
- examples of the material that is not a ferromagnetic material include a paramagnetic material and a nonmagnetic material.
- Specific examples of the nonmagnetic material include Cu—Zn ferrite and glass ceramic.
- the insulator layers 11a, 11g, and 11h are made of a ferromagnetic material, and specific examples of the ferromagnetic material include Ni—Cu—Zn ferrite.
- non-magnetic amorphous or crystalline glass as the material constituting the insulator layers 11b to 11f.
- the coil conductors 16 to 19 are made of a conductive material such as silver, and are formed in a spiral shape by a plating method or a printing method. As another method for forming the coil conductors 16 to 19, a thin film method using sputtering or etching may be used. A spiral coil may be further formed by plating on the upper surface of the spiral coil formed by the thin film method.
- the coil conductor 16 and a part of the coil conductor 18 are disposed at substantially the same position in a top view.
- the direction in which the coil conductor 16 and the coil conductor 18 are wound is the same.
- the coil conductor 16 and the coil conductor 18 are magnetically coupled to form a common mode filter 20.
- a part of the coil conductor 17 and the coil conductor 19 are also arranged at substantially the same position in a top view.
- the direction in which the coil conductor 17 and the coil conductor 19 are wound is the same.
- the coil conductor 17 and the coil conductor 19 are magnetically coupled to form a common mode filter 21.
- the coil conductor 16 and the coil conductor 17 are electrically connected to each other via via electrodes 12a formed in through holes penetrating the insulator layer 11d and the insulator layer 11e.
- the coil conductor 18 and the coil conductor 19 are electrically connected to each other via via electrodes 13a formed in through holes penetrating the insulator layer 11c and the insulator layer 11d.
- the two via electrodes 12a respectively formed in the insulator layer 11d and the insulator layer 11e are provided at the same position in a top view.
- the two via electrodes 13a respectively formed in the insulator layers 11c and 11d are also provided at the same position in a top view.
- the via electrode 12a and the via electrode 13a are formed through holes at predetermined locations of the insulator layers 11d, 11e, 11c and 11d with a laser, and these through holes are filled with a conductive material such as silver. Formed.
- the metal layer 14 is made of a metal material such as silver or silver palladium alloy, and is continuously formed in a plate shape by attaching a printing method, a plating method, or a metal foil to the upper surface of the insulator layer 11g.
- the metal layer 14 is disposed above the uppermost coil conductor 16 among the coil conductors 16 to 19.
- the metal layer 14 faces the coil 12 of the coils 12 and 13, and the metal layer 14 faces the coil conductor 16 of the coil conductors 16 and 17 instead of the entire coil 12.
- the coil conductor 16 does not have to be configured to face the entire metal layer 14 in a top view, and may be configured to face a part of the metal layer 14, for example.
- the area where the coil conductor 16 and the metal layer 14 face each other can be adjusted as appropriate by changing the line width and length of the coil conductor 16 in a top view. By adjusting the area where the coil conductor 16 and the metal layer 14 face each other, the capacitance component generated between the coil conductor 16 and the metal layer 14 can be adjusted. Alternatively, the area of the coil conductor 16 and the metal layer 14 may be adjusted by changing the area of the metal layer 14.
- the sum of the lengths of the coil conductor 16 and the coil conductor 17 and the sum of the lengths of the coil conductor 18 and the coil conductor 19 are substantially equal. By making them substantially the same, the balance of the differential signal is improved and the loss of the differential signal can be prevented from increasing. In this case, by changing the lengths of the coil conductor 16 and the coil conductor 17, the area where the coil conductor 16 and the metal layer 14 face each other is adjusted, and a capacitance component generated between the coil conductor 16 and the metal layer 14. Can be adjusted.
- the insulator layers 11h and 11f made of a magnetic material are provided on the upper and lower surfaces of the metal layer 14.
- the magnetic material may not necessarily be provided on the upper and lower surfaces of the metal layer 14.
- the number of insulator layers 11a to 11h to be stacked is not limited to the number shown in FIG.
- the materials constituting the insulator layers 11a to 11h may be the same.
- External electrodes 22 to 25 that are electrically connected to the coil conductors 16 to 19 are provided on a pair of opposite end surfaces of the laminate 15.
- External electrodes 26 that are electrically connected to the metal layer 14 are provided on a pair of opposite end surfaces of the stacked body 15.
- the metal layer 14 is connected to the external electrode 26 through the extraction electrode 14a.
- External electrodes 22 to 26 form silver on the pair of end faces and the pair of side faces of the laminate 15 by a printing method.
- a nickel layer may be formed on the silver surface by a plating method.
- a low melting point metal such as tin or solder material may be further formed on the surface of the nickel layer by a plating method.
- FIG. 3 is a circuit schematic diagram of the common mode noise filter 1001 according to the first embodiment.
- the coil 12 includes the spiral coil conductor 16 and the spiral coil conductor 17.
- the coil 13 has a spiral coil conductor 18 and a spiral coil conductor 19.
- the coil conductor 16 and the coil conductor 18 are magnetically coupled to each other to form a common mode filter 20.
- the coil conductor 17 and the coil conductor 19 are magnetically coupled to each other to form a common mode filter 21.
- the common mode filter 20 is connected in series with the common mode filter 21.
- the coil conductors 16 to 19 are arranged in the order of the coil conductor 16, the coil conductor 18, the coil conductor 17, and the coil conductor 19 from above.
- the common mode noise is attenuated in a wide band. Can do. This is because the capacitance component is generated mainly between the coil conductor 16 and the metal layer 14 connected to the ground instead of the entire coil 12, and the capacitance component is substantially reduced between the coil conductor 17 and the metal layer 14. By not generating the two attenuation poles, two attenuation poles can be obtained.
- the common mode filter 6 and the common mode filter 7 function as inductors.
- the impedance of the inductor also increases, a potential difference is generated at the input / output portion of the common mode noise filter 500, stray capacitance is generated between the input and output, and self-parallel resonance occurs.
- the common mode filter 20 and the common mode filter 21 function as inductors to remove common mode noise.
- the impedance is reduced due to the capacitive component between the coil conductor 16 and the metal layer 14, and the potential difference between the input and output of the common mode noise filter 1001 can be suppressed from becoming too high. Further, by suppressing the generation of stray capacitance between input and output, the self-parallel resonance frequency of the coils 12 and 13 is increased.
- the common mode noise filter 1001 can bypass the common mode noise to the ground by the capacitance component between the coil conductor 16 and the metal layer 14, the common mode noise can be attenuated in a wide band.
- the common mode noise filter 1001 of the first embodiment a small capacitance is generated only between the metal layer 14 and the coil conductor 16, and no capacitance is generated between the metal layer 14 and the coil conductor 17.
- series resonance is difficult between the coil conductor 17 and the ground.
- the self-parallel resonance of the coils 12 and 13 and the series resonance of the capacitance between the coil conductor 16 and the ground can be separated and adjusted, so that two attenuations in the frequency characteristic of the attenuation amount of the common mode noise.
- common mode noise can be attenuated in a wide band.
- FIG. 4 is a diagram comparing the attenuation characteristics of common mode noise between the common mode noise filter of the first embodiment shown in FIG. 1 as an example and the conventional common mode noise filter shown in FIG. 16 as a comparative example. is there.
- the common mode noise filter of this embodiment can attenuate common mode noise in a higher frequency region than the common mode noise filter of the comparative example, and further, in the communication frequency band of the cellular radio system.
- Common mode noise can be attenuated in a wide band from 700 MHz to 3 GHz.
- the common mode noise filter of the comparative example has the self-resonant frequencies of the coils 2 and 3 in the vicinity of 800 MHz.
- the self-resonant frequencies of the coil 12 and the coil 13 are in the vicinity of 2 GHz, and the coils 12 and 13 function as inductors so that the common mode can be attenuated.
- a high common mode attenuation capability can be realized by a bypass effect to the ground up to the resonance frequency band of the capacitive component between the metal layer 14 and the ground connection up to around 3 GHz.
- the self-resonant frequency is positioned in a high frequency region to improve the attenuation characteristic of common mode noise, and in the high frequency region, the attenuation characteristic can be obtained by a bypass effect to the ground.
- the ratio of the length of the coil conductor 16 to the entire length of the coil 12 can be changed according to desired characteristics. That is, the capacitance component between the coil 12 and the metal layer 14 can be adjusted by adjusting the area where the coil 12 and the metal layer 14 connected to the ground are opposed to each other. Can be adjusted.
- the common mode noise filter 1001 can maintain the signal quality without deteriorating the differential digital signal without resonating between the coils 12 and 13 and the metal layer 14.
- the distance between the coil conductor 16 and the metal layer 14 is adjusted to change the capacitance component, or the length of the coil conductors 16 to 19 is changed, so that the series resonance between the coil conductor 16 and the ground is achieved.
- the resonance frequency and the resonance frequency of the self-parallel resonance of the coils 12 and 13 can be adjusted. At this time, a large attenuation amount can be secured at a specific frequency by bringing the resonance frequencies of the coils 12 and 13 close to or coincide with each other.
- the common mode noise filter 1001 not only attenuates the common mode noise, but can protect the electronic device from the overvoltage even when an overvoltage is applied.
- FIG. 5 is an exploded perspective view of another common mode noise filter 1002 according to the first embodiment provided with static electricity passage portions 27a and 27b below the insulator layer 11a.
- the same reference numerals are assigned to the same portions as those of the common mode noise filter 1001 shown in FIG.
- the configuration above the insulator layer 11b is omitted for the sake of simplicity.
- the external electrodes 22 to 26 shown in FIG. 2 are omitted, but are provided at the same position.
- the common mode noise filter 1002 in FIG. 5 includes electrostatic electrodes 28a to 28d connected to external electrodes 22 to 25 on an insulating layer 11j made of a nonmagnetic material and provided below the insulating layer 11a.
- the common mode noise filter 1002 further includes an electrostatic electrode 29 connected to the external electrode 26.
- the tip portions 128a and 128b opposite to the portions connected to the external electrodes 22 and 23 of the electrostatic electrodes 28a and 28b are formed in the static electricity passing portion 27a and are connected to the external electrodes 24 and 25 of the electrostatic electrode 28b.
- the tip portions 128c and 128d on the opposite side of the portion formed are formed in the static electricity passage portion 27b.
- the tip portions 128a and 128b of the static electricity electrodes 28a and 28b extend below the static electricity passage portion 27a and between the static electricity passage portion 27a and the insulator layer 11j, and the tip portions of the static electricity electrodes 28c and 28d. 128c and 128d extend below the static electricity passage portion 27b and between the static electricity passage portion 27b and the insulator layer 11j.
- the static electricity electrodes 28a and 28b are in contact with the static electricity passage portion 27a in a large area
- the static electricity electrodes 28c and 28d are in contact with the static electricity passage portion 27b in a large area.
- the electrostatic electrode 29 is formed in a straight line so as to be in contact with the lower surface of the static electricity passing portions 27a and 27b from one side surface of the insulator layer 11j to the other side surface on the opposite side.
- a gap 29 s is provided between each of the tip portions 128 a to 128 d of the electrostatic electrodes 28 a to 28 d and the electrostatic electrode 29.
- the coil conductor 16 and the electrostatic electrode 28 a are electrically connected via the external electrode 22.
- the coil conductor 17 and the electrostatic electrode 28b are electrically connected
- the coil conductor 18 and the electrostatic electrode 28c are electrically connected
- the coil conductor 19 and the electrostatic electrode 28d are electrically connected.
- the extraction electrode 14 a of the metal layer 14 and the electrostatic electrode 29 are electrically connected via the external electrode 26, and the external electrode 26 and the static electricity passing portions 27 a and 27 b are connected via the electrostatic electrode 29.
- the external electrode 22 and the external electrode 23 are connected with the static electricity passing portion 27a
- the external electrode 24 and the external electrode 25 are connected with the static electricity passing portion 27b.
- the static electricity passage portion 27a, and the static electricity passage portion 27b are connected in parallel to each other.
- a voltage equal to or higher than a predetermined value, which is an overvoltage is applied to the external electrode 22 or the external electrode 23
- a current flows from the static electricity passing portion 27a to the ground via the external electrode 26.
- the external electrode 24 and the external electrode 25 when a voltage of a predetermined value or more that is an overvoltage is applied to the external electrode 24 or the external electrode 25, the static electricity passing portion 27b goes to the ground via the external electrode 26. Current flows.
- An insulating layer 11k made of a non-magnetic material is formed on the upper surfaces of the electrostatic electrodes 28a to 28d and the electrostatic electrode 29, and the electrostatic electrodes 28a to 28d and the electrostatic electrode 29 are sandwiched between the non-magnetic materials. Further, an insulator layer 11m made of a magnetic material is formed on the lower surface of the insulator layer 11j.
- the static electricity passing portions 27a and 27b are configured by forming a voltage-dependent resistance material having a resistance that varies depending on an applied voltage on the insulator layer 11j by a printing method or coating.
- the voltage-dependent resistance material include a varistor material such as a ceramic material mainly composed of zinc oxide, a metal material including at least one of aluminum, nickel, and copper, or at least one of silicon, epoxy, and phenol. Resin materials containing one can be used.
- the electrostatic electrodes 28a to 28d and the electrostatic electrode 29 are made of a metal material such as silver or silver palladium alloy, and a printing method, a plating method, or a metal foil made of the metal material is pasted on the upper surface of the insulator layer 11j. It is formed into a plate shape by a method such as attaching.
- the coil conductors 16 to 19 are sandwiched between the metal layer 14 made of plate-like metal, the electrostatic electrodes 28a to 28d made of plate-like metal, and the electrostatic electrode 29.
- the density deviation of the entire laminate 15 can be reduced.
- the product can be thinned. Furthermore, the effect of attenuating the common mode noise by the stray capacitance between the coils 12, 13, the electrostatic electrodes 28a to 28d and the electrostatic electrode 29 can be expected.
- portions where the static electricity passing portions 27a and 27b, the static electricity electrodes 28a to 28d, and the static electricity electrode 29 are formed are not limited to below the insulator layer 11a. There may be.
- the static electricity passage portions 27a and 27b may be constituted by spaces instead of the voltage dependent resistance material. All or part of the electrostatic electrodes 28a to 28d and the electrostatic electrode 29 may be provided in different layers. Further, another metal layer connected to the external electrodes 22 to 25 is provided on the upper surface of the insulator layer 11g on which the metal layer 14 is formed, and a gap is formed between the other metal layer and the metal layer 14, Another metal layer connected to the external electrode 26 is provided in the vicinity of each of the coil conductors 16 to 19, and a gap is formed between the other metal layer and the coil conductors 16 to 19. 27a and static electricity passing portion 27b may be used.
- the metal layer 14 is provided above the coil conductor 16 positioned at the uppermost position among the coil conductors 16 to 19, but at the lowermost position among the coil conductors 16 to 19. You may provide below the coil conductor 19 located.
- FIG. 6 is an exploded perspective view of the common mode noise filter 2001 according to the second embodiment.
- components having the same configuration as those in the first embodiment are denoted by the same reference numerals.
- the common mode noise filter 2001 according to the second embodiment is a coil located at the lowest position among the coil conductors 16 to 19 with respect to the common mode noise filter 1001 according to the first embodiment shown in FIG.
- a metal layer 114 is further provided below the conductor 19.
- the metal layer 114 is formed on the upper surface of the insulator layer 11i. Accordingly, the metal layer 14 faces only the coil 12 of the coils 12 and 13 and does not face the coil 13, and the metal layer 114 faces only the coil 13 of the coils 12 and 13 and faces the coil 12. do not do. Furthermore, the metal layers 14 and 114 are opposed to the coil conductors 16 and 19 rather than the entire coils 12 and 13, respectively.
- FIG. 7 is a circuit schematic diagram of the common mode noise filter 2001 according to the second embodiment.
- FIG. 8 is a diagram comparing the common mode noise attenuation characteristics of the common mode noise filter 2001 according to the second embodiment shown in FIG. 6 as an example and the conventional common mode noise filter 500 shown in FIG. 16 as a comparative example. It is.
- the common mode noise filter of the present embodiment can attenuate common mode noise in the high frequency region than the common mode noise filter of the comparative example, and the attenuation amount of the common mode noise in the high frequency region can be reduced. large.
- the attenuation amount of the common mode noise in the high frequency region is increased. .
- the differential signal flowing through the coil conductor 5a and the coil conductor 4b is deteriorated by the balance between the signal passing through the coil 3 and the signal passing through the coil 2 due to the stray capacitance therebetween. Therefore, the balance degree of the differential mode signal may deteriorate in each of the common mode filter 7 and the common mode filter 6.
- FIG. 9 shows an amplitude balance degree of a differential (differential mode) signal between the common mode noise filter according to the second embodiment shown in FIG. 6 as an example and the conventional common mode noise filter shown in FIG. 16 as a comparative example.
- FIG. 9 shows an amplitude balance degree of a differential (differential mode) signal between the common mode noise filter according to the second embodiment shown in FIG. 6 as an example and the conventional common mode noise filter shown in FIG. 16 as a comparative example.
- FIG. 10 is a diagram comparing the degree of phase balance of the differential signals.
- FIG. 11 is a diagram comparing the same-mode conversion characteristics.
- the amplitude balance and the phase balance are the difference between the amplitude and phase of the differential signal before being input to the common mode noise filter and the difference in amplitude and phase of the differential signal after being input to the common mode noise filter. It represents zero (ideal state), and the closer to the ideal state, the higher the quality of the differential signal.
- the common mode noise filter of this example has a higher degree of balance of differential (differential mode) signals in both amplitude and phase than the common mode noise filter of the comparative example.
- the deteriorated component (differential imbalance) in the comparative example is converted into a common mode component. That is, there is a possibility that common mode noise is generated when the differential signal passes through the common mode filter of the comparative example.
- cellular wireless portable terminals such as smartphones use a communication frequency band from 700 MHz to 3 GHz.
- the differential signal has a frequency component from 700 MHz to 3 GHz
- a part of the differential signal is converted into common mode noise from 700 MHz to 3 GHz, and this common mode noise causes reception sensitivity of the cellular radio unit of the portable terminal. Will be deteriorated.
- the metal layers 14 and 114 are opposed to the coil conductors 16 and 19 where no stray capacitance is generated therebetween, and the coil conductor is formed by a minute capacitance between the metal layers 14 and 114. 16 and 19 can be adjusted so that the balance of the amplitude and phase of the differential signal flowing in the differential state flows into an ideal state.
- the common mode noise filter according to the present embodiment can adjust the balance degree of the differential mode signal, so that mode conversion hardly occurs and common mode noise is less likely to occur. In particular, as shown in FIGS.
- the common mode noise filter in the present embodiment is more balanced in amplitude of the differential signal than the common mode noise filter of the comparative example.
- the degree of phase and the degree of phase balance are good, and mode conversion is difficult to occur.
- the common mode filter 20 since a capacitance is formed only between the coil conductor 16 and the metal layer 14, the common mode filter 20 has a differential mode signal balance degree. Improved.
- the example of the common mode noise filter 2001 in the second embodiment is preferable to the example described in the first embodiment because the balance degree of the differential mode signal is improved by both the common mode filters 20 and 21.
- the distance between the coil conductor 18 and the coil conductor 17 is longer than the distance between the coil conductor 16 and the coil conductor 18 and the distance between the coil conductor 17 and the coil conductor 19. May be.
- the magnetic coupling is weakened by increasing the distance between the coil conductor 16 and the coil conductor 18 facing the metal layer 14, and the magnetic coupling is weakened by increasing the distance between the coil conductor 17 and the coil conductor 19. Therefore, the self-parallel resonance frequency at the time of magnetic coupling of the coil 12 and the coil 13 can be adjusted, and the adjustment of the broadband common mode noise removal performance becomes easy.
- FIG. 12 is an exploded perspective view of the common mode noise filter 3001 according to the third embodiment.
- components having the same configurations as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.
- the common mode noise filter 3001 in the third embodiment is between the coil conductor 18 and the coil conductor 19 constituting the coil 13 as shown in FIG. A coil conductor 16 and a coil conductor 17 constituting the coil 12 are arranged.
- FIG. 13 is a circuit schematic diagram of the common mode noise filter 3001 according to the third embodiment.
- the common mode noise filter 3001 in the third embodiment can attenuate common mode noise in a higher frequency region than the common mode noise filter 500 in the same manner as the common mode noise filter 1001 in the first embodiment.
- the coil conductor 16 and the coil conductor 17 are at the same potential, so that no stray capacitance is generated between the coil conductor 16 and the coil conductor 17, and the difference due to the reduction in the differential mode characteristic impedance. It is possible to prevent the deterioration of the moving signal.
- the common mode noise filter 3001 in the third embodiment further includes a metal layer 114 disposed below the coil conductor 19 located at the lowest position, similarly to the common mode noise filter 2001 in the second embodiment. Good.
- the distance between the coil conductor 16 and the coil conductor 17 may be longer than the distance between the coil conductor 16 and the coil conductor 18 and the distance between the coil conductor 17 and the coil conductor 19. That is, since the magnetic coupling between the common mode filter 21 and the common mode filter 22 is weak, the self-parallel resonance frequency at the time of magnetic coupling of the coil 12 and the coil 13 can be adjusted. Adjustment is easy.
- FIG. 14 is an exploded perspective view of the common mode noise filter 4001 according to the fourth embodiment.
- components having the same configurations as those in the first to third embodiments are given the same reference numerals, and descriptions thereof are omitted.
- the common mode noise filter 4001 in the fourth embodiment has one end 30a connected to the coil conductor 16 and an open end 30a as shown in FIG.
- a spiral coil conductor 30 having one end 30b is further provided.
- the coil conductor 30 is formed on the upper surface of the nonmagnetic insulator layer 11n provided between the coil conductor 16 and the insulator layer 11f, and one end 30a is electrically connected to the coil conductor 16 via the external electrode 22. Has been.
- the coil conductor 30 is provided between the coil conductor 16 disposed at the uppermost position among the coil conductors 16 to 19 and the metal layer 14 disposed above the coil conductor 16.
- the coil conductor 16 and the one end 30a of the coil conductor 30 are connected. Furthermore, the direction of the current flowing through the coil conductor 16 and the direction of the current flowing through the coil conductor 30 are the same in a top view.
- the coil conductors 16 to 19 all function as inductors and are magnetically coupled to the coil conductor 30, and a large impedance is generated in the coil conductors 16 to 19.
- a potential difference is generated between each of the conductors 16 to 19 and the coil conductor 30.
- stray capacitance is generated, and the stray capacitance, the coil conductors 16 to 19 and the coil conductor 30 form a resonance circuit. Therefore, the coil conductor 30 has a large impedance component in a higher frequency region.
- resonance occurs between the coil conductor 30 and the metal layer 14, so that common mode noise having a higher frequency can be bypassed to the ground.
- common-mode noise attenuation characteristics in a high-frequency region can be improved, and wide-band common-mode noise attenuation characteristics can be realized.
- FIG. 15 is a diagram comparing the common mode noise attenuation characteristics of the common mode noise filter 4001 of the fourth embodiment described in FIG. 14 as an example and the conventional common mode noise filter 500 illustrated in FIG. 16 as a comparative example. It is.
- the common mode noise filter in the present embodiment can attenuate 5 GHz common mode noise in addition to 700 MHz to 3 GHz band common mode noise attenuation. That is, in addition to the cellular radio communication terminal and the 2.4 GHz band WiFi communication band, it also supports a 5 GHz WiFi communication band, and can attenuate common mode noise in a wide band.
- the function of the coil conductor 30 differs depending on the intruding signal or noise differential mode and common mode transmission mode. Thereby, it is possible to secure an attenuation amount for the common mode noise without degrading the differential signal.
- a part of the width of the coil wire of the coil conductor 30 is locally widened to reduce the capacitance generated between the metal layer 14 and the metal layer 14. You may enlarge it. This makes it possible to easily adjust the value of the series resonance frequency generated with the ground when common mode noise enters.
- common mode noise filters of the second to fourth embodiments may further include the static electricity passing portions 27a and 27b described in the first embodiment.
- the common mode noise filters of the first to fourth embodiments include one coil 12 and one coil 13, but may be an array type including two or more coils 12 and two or more coils 13.
- the common mode noise filters of Embodiments 1 to 4 include one common mode filter 20 and one common mode filter 21, but include two or more common mode filters 20 and two or more common mode filters 21. May be.
- the terms indicating the directions such as “upper surface”, “upper”, and “lower” are only relative to the relative positional relationship of the components of the common mode noise filter such as the insulator layer and the coil conductor. It is a term indicating the relative direction to depend on, and not an absolute direction.
- the common mode noise filter of the present disclosure has an effect of improving the attenuation characteristics of common mode noise in a high frequency region, and is used particularly as a noise countermeasure for various electronic devices such as digital devices, AV devices, and information communication terminals. This is useful in a small and thin common mode noise filter or the like.
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Abstract
Description
図1は実施の形態1におけるコモンモードノイズフィルタ1001の分解斜視図である。図2はコモンモードノイズフィルタ1001の斜視図である。
図6は実施の形態2におけるコモンモードノイズフィルタ2001の分解斜視図である。なお、実施の形態2においては、実施の形態1と同様の構成を有するものについては、同一符号を付す。
図12は、実施の形態3におけるコモンモードノイズフィルタ3001の分解斜視図である。なお、実施の形態3においては、実施の形態1、2と同様の構成を有するものについては、同一符号を付しており、その説明は省略する。
図14は、実施の形態4におけるコモンモードノイズフィルタ4001の分解斜視図である。なお、実施の形態4においては、実施の形態1~3と同様の構成を有するものについては、同一符号を付しており、その説明は省略する。
11b 絶縁体層(第4の絶縁体層)
11c 絶縁体層(第2の絶縁体層)
11d 絶縁体層(第3の絶縁体層)
11e 絶縁体層(第1の絶縁体層)
11f 絶縁体層
11g 絶縁体層(第5の絶縁体層)
11h 絶縁体層
11i 絶縁体層
11j 絶縁体層
11k 絶縁体層
12 コイル(第1のコイル)
12a ビア電極
13 コイル(第2のコイル)
13a ビア電極
14 金属層(第1の金属層)
15 積層体
16 コイル導体(第1のコイル導体)
17 コイル導体(第2のコイル導体)
18 コイル導体(第3のコイル導体)
19 コイル導体(第4のコイル導体)
20 コモンモードフィルタ(第1のコモンモードフィルタ)
21 コモンモードフィルタ(第2のコモンモードフィルタ)
Claims (16)
- 第1から第5の絶縁体層と、
前記第1の絶縁体層の上面に形成されている渦巻状の第1のコイル導体と、
前記第2の絶縁体層の上面に形成され、前記第1のコイル導体の下方に設けられている渦巻状の第2のコイル導体と、
を有する第1のコイルと、
前記第3の絶縁体層の上面に形成されている渦巻状の第3のコイル導体と、
前記第4の絶縁体層の上面に形成され、前記第3のコイル導体の下
方に設けられている渦巻状の第4のコイル導体と、
を有する第2のコイルと、
前記第5の絶縁体層の上面に形成されている第1の金属層と、
前記第1から前記第4のコイル導体のそれぞれに接続されている第1から第4の外部電極と、
前記第1の金属層に接続され、グランドに接続するように設けられている第5の外部電極と、
を備え、
前記第1のコイル導体および前記第2のコイル導体の間に前記第3のコイル導体が設けられ、
前記第3のコイル導体および前記第4のコイル導体の間に前記第2のコイル導体が設けられ、
前記第1のコイル導体と前記第3のコイル導体とは互いに磁気結合して第1のコモンモードフィルタを形成し、
前記第2のコイル導体と前記第4のコイル導体とは互いに磁気結合して第2のコモンモードフィルタを形成し、
前記第1のコモンモードフィルタは前記第2のコモンモードフィルタと直列に接続され、
前記第1の金属層は、第1のコイル導体の上方に設けられている、コモンモードノイズフィルタ。 - 前記第1の金属層は、前記第5の絶縁体層を介して前記第1のコイル導体と対向し、
上面視で前記第1の金属層の全体ではなく一部分が前記第1のコイル導体と対向している、請求項1に記載のコモンモードノイズフィルタ。 - 前記第1の金属層は、前記第5の絶縁体層を介して前記第1のコイル導体と対向し、
前記第1のコイル導体の長さと、前記第2のコイル導体の長さとは、互いに異なる、請求項2に記載のコモンモードノイズフィルタ。 - 前記第1、前記第2、前記第3、前記第4および前記第5の外部電極と電気的に接続されている第1の静電気通過部をさらに備え、
前記第1の静電気通過部は、所定の値以上の電圧が印加されると通電され、前記所定の値より低い電圧が印加されると絶縁体として機能する、請求項1に記載のコモンモードノイズフィルタ。 - 前記第1の静電気通過部は、酸化亜鉛を主成分としたバリスタ材料、またはアルミニウム、ニッケルおよび銅のうち少なくとも1つを含む金属材料、またはシリコン、エポキシおよびフェノールのうち少なくとも1つを含む樹脂材料、または空間からなる、請求項4に記載のコモンモードノイズフィルタ。
- 前記第1の静電気通過部および前記第5の外部電極と電気的に接続されている第1の静電気用電極をさらに備える、請求項4に記載のコモンモードノイズフィルタ。
- 前記第1、前記第2および前記第5の外部電極と電気的に接続されている第2の静電気通過部と、
前記第3、前記第4および前記第5の外部電極と電気的に接続されている第3の静電気通過部と、をさらに備え、
前記第2および前記3の静電気通過部はともに、所定の値以上の電圧が印加されると通電され、前記所定の値より低い電圧が印加されると絶縁体として機能する、請求項1に記載のコモンモードノイズフィルタ。 - 前記第2および前記第3の静電気通過部は、酸化亜鉛を主成分としたバリスタ材料、またはアルミニウム、ニッケルおよび銅のうち少なくとも1つを含む金属材料、またはシリコン、エポキシおよびフェノールのうち少なくとも1つを含む樹脂材料、または空間からなる、請求項7に記載のコモンモードノイズフィルタ。
- 前記第2の静電気通過部、前記第3の静電気通過部および前記第5の外部電極と電気的に接続されている第1の静電気用電極をさらに備える、請求項7に記載のコモンモードノイズフィルタ。
- 前記第4のコイル導体の下方で、グランドに接続するように設けられている第2の金属層をさらに備える、
請求項1に記載のコモンモードノイズフィルタ。 - 前記第3のコイル導体と前記第2のコイル導体との間の距離は、前記第1のコイル導体と前記第3のコイル導体との間の距離および前記第2のコイル導体と前記第4のコイル導体との間の距離よりも長い、請求項1または10のいずれかに記載のコモンモードノイズフィルタ。
- 前記第1のコイル導体と前記第1の金属層との間に第5のコイル導体をさらに備え、
前記第5のコイル導体の一方の端部は前記第1のコイル導体と接続され、前記第5のコイル導体の他方の端部は開放され、
前記第1のコイル導体に流れる電流の向きと前記第5のコイル導体に流れる電流の向きは上面視で同じである、請求項1または4のいずれかに記載のコモンモードノイズフィルタ。 - 第1から第5の絶縁体層と、
前記第1の絶縁体層の上面に形成されている渦巻状の第1のコイル導体と、
前記第2の絶縁体層の上面に形成され、前記第1のコイル導体の下方に設けられている渦巻状の第2のコイル導体と、
を有する第1のコイルと、
前記第3の絶縁体層の上面に形成されている渦巻状の第3のコイル導体と、
前記第4の絶縁体層の上面に形成され、前記第3のコイル導体の下方に設けられている渦巻状の第4のコイル導体と、
を有する第2のコイルと、
前記第5の絶縁体層の上面に形成されている第1の金属層と、
前記第1から前記第4のコイル導体のそれぞれに接続されている第1から第4の外部電極と、
前記第1の金属層に接続され、グランドに接続するように設けられている第5の外部電極と、
を備え、
前記第2のコイル導体および前記第3のコイル導体の間に前記第1のコイル導体が設けられ、
前記第1のコイル導体および前記第4のコイル導体の間に前記第2のコイル導体が設けられ、
前記第1のコイル導体と前記第3のコイル導体とは互いに磁気結合して第1のコモンモードフィルタを形成し、
前記第2のコイル導体と前記第4のコイル導体とは互いに磁気結合して第2のコモンモードフィルタを形成し、
前記第1のコモンモードフィルタは前記第2のコモンモードフィルタと直列に接続され、
前記第1の金属層は、第3のコイル導体の上方に設けられている、コモンモードノイズフィルタ。 - 前記第4のコイル導体の下方で、グランドに接続するように設けられる第2の金属層をさらに備える、
請求項13に記載のコモンモードノイズフィルタ。 - 前記第1のコイル導体と前記第2のコイル導体との間の距離は、前記第1のコイル導体と前記第3のコイル導体との間の距離および前記第2のコイル導体と前記第4のコイル導体との間の距離よりも長い、請求項13または14のいずれかに記載のコモンモードノイズフィルタ。
- 前記第3のコイル導体と前記第1の金属層との間に第5のコイル導体をさらに備え、
前記第5のコイル導体の一方の端部は前記第3のコイル導体と接続され、前記第5のコイル導体の他方の端部は開放され、
前記第3のコイル導体に流れる電流の向きと前記第5のコイル導体に流れる電流の向きは上面視で同じである請求項13に記載のコモンモードノイズフィルタ。
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CN201580033885.8A CN106664069B (zh) | 2014-11-05 | 2015-11-02 | 共模噪声滤波器 |
KR1020177000574A KR102473785B1 (ko) | 2014-11-05 | 2015-11-02 | 공통 모드 노이즈 필터 |
US15/317,860 US10096417B2 (en) | 2014-11-05 | 2015-11-02 | Common mode noise filter |
JP2016557453A JPWO2016072078A1 (ja) | 2014-11-05 | 2015-11-02 | コモンモードノイズフィルタ |
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Cited By (2)
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WO2021010309A1 (ja) * | 2019-07-17 | 2021-01-21 | パナソニックIpマネジメント株式会社 | コモンモードノイズフィルタ |
JP2021125485A (ja) * | 2020-01-31 | 2021-08-30 | 太陽誘電株式会社 | コイル部品及び電子機器 |
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JP6414529B2 (ja) | 2015-09-25 | 2018-10-31 | 株式会社村田製作所 | 電子部品 |
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CN106849896A (zh) * | 2017-01-22 | 2017-06-13 | 合肥联宝信息技术有限公司 | 一种滤波器件和电子设备 |
JP6696483B2 (ja) * | 2017-07-10 | 2020-05-20 | 株式会社村田製作所 | コイル部品 |
CN110622263A (zh) * | 2017-08-07 | 2019-12-27 | 松下知识产权经营株式会社 | 共模噪声滤波器 |
JP6778400B2 (ja) * | 2017-11-29 | 2020-11-04 | 株式会社村田製作所 | 積層コイル部品 |
CN109887708B (zh) * | 2017-11-29 | 2021-04-09 | 株式会社村田制作所 | 电子部件 |
FR3077432B1 (fr) * | 2018-01-29 | 2021-07-02 | St Microelectronics Tours Sas | Filtre de mode commun |
WO2019188215A1 (ja) * | 2018-03-28 | 2019-10-03 | パナソニックIpマネジメント株式会社 | コモンモードノイズフィルタ |
JP6874745B2 (ja) * | 2018-08-08 | 2021-05-19 | 株式会社村田製作所 | コモンモードチョークコイル |
WO2020110692A1 (ja) * | 2018-11-30 | 2020-06-04 | パナソニックIpマネジメント株式会社 | コモンモードノイズフィルタ |
JP7251243B2 (ja) * | 2019-03-22 | 2023-04-04 | Tdk株式会社 | 積層コイル部品 |
JP7229056B2 (ja) * | 2019-03-22 | 2023-02-27 | Tdk株式会社 | 積層コイル部品 |
KR102184559B1 (ko) * | 2019-07-05 | 2020-12-01 | 삼성전기주식회사 | 코일 부품 |
KR102679990B1 (ko) * | 2019-07-17 | 2024-07-02 | 삼성전기주식회사 | 코일 부품 |
TWI727547B (zh) * | 2019-12-12 | 2021-05-11 | 國立臺灣大學 | 雜訊抑制器 |
KR20240043294A (ko) * | 2022-09-27 | 2024-04-03 | 주식회사 아모텍 | 적층형 공통 모드 필터 |
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CN106664069A (zh) | 2017-05-10 |
CN204425289U (zh) | 2015-06-24 |
KR102473785B1 (ko) | 2022-12-02 |
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US10096417B2 (en) | 2018-10-09 |
US20170294257A1 (en) | 2017-10-12 |
KR20170084005A (ko) | 2017-07-19 |
JPWO2016072078A1 (ja) | 2017-08-17 |
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