WO2015104936A1 - Noyau de ferrite et filtre de bruit - Google Patents

Noyau de ferrite et filtre de bruit Download PDF

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Publication number
WO2015104936A1
WO2015104936A1 PCT/JP2014/082505 JP2014082505W WO2015104936A1 WO 2015104936 A1 WO2015104936 A1 WO 2015104936A1 JP 2014082505 W JP2014082505 W JP 2014082505W WO 2015104936 A1 WO2015104936 A1 WO 2015104936A1
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WO
WIPO (PCT)
Prior art keywords
ferrite core
core
cable
holes
noise filter
Prior art date
Application number
PCT/JP2014/082505
Other languages
English (en)
Japanese (ja)
Inventor
辰将 河原
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2015104936A1 publication Critical patent/WO2015104936A1/fr

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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 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F2017/065—Core mounted around conductor to absorb noise, e.g. EMI 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 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F2017/067—Core with two or more holes to lead through conductor

Definitions

  • the present invention relates to a ferrite core and a noise filter using the ferrite core.
  • a ferrite core made of a ferrite material has been used as a component for removing high-frequency noise propagating through a signal line cable.
  • the ferrite core has, for example, a cylindrical shape having a through-hole through which the cable is inserted, but the cylindrical shape is usually diametrically along the axial direction so that it can be attached to a cable with a connector later. It is composed of two half-divided cylindrical core pieces (see, for example, Patent Document 1). The two core pieces are combined as a cylindrical ferrite core surrounding the cable, and are held in the holding case in this state.
  • the ferrite core collects the magnetic flux generated around the cable by the high-frequency noise current flowing through the cable, and reduces the high-frequency noise by converting the magnetic energy into heat by the magnetic loss of the ferrite.
  • Such a ferrite core exhibits high impedance against high frequency noise. This impedance can be increased by winding the cable multiple times through the through hole in the ferrite core (ie, increasing the number of turns).
  • the frequency characteristics of the impedance of the ferrite core are those in which the resonance point is moved to the low frequency side.
  • the impedance of the ferrite core tends to greatly decrease in a high frequency range exceeding 100 MHz, for example. Therefore, in the conventional ferrite core, even if the number of turns is increased, it is difficult to increase the impedance in a high frequency region exceeding 100 MHz, for example.
  • the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a ferrite core capable of increasing impedance in a high frequency region and a noise filter using the ferrite core. .
  • the ferrite core according to the present invention is a ferrite core configured by combining a plurality of core pieces, and the plurality of core pieces are configured to form a plurality of through holes through which the cable is inserted in the same direction. It is characterized by being.
  • the ferrite core of the present invention when a plurality of core pieces are combined as a ferrite core, a plurality of through holes formed between the plurality of core pieces are directed in the same direction from one end side to the other end side.
  • the cable can be wound in multiple ways in a threaded form.
  • the core piece has a partition wall that partitions a plurality of through holes when combined.
  • the noise filter according to the present invention includes a ferrite core composed of a plurality of core pieces combined so as to form a plurality of through holes therebetween, and a plurality of penetrations when the plurality of core pieces are combined as a ferrite core.
  • a cable wound around the ferrite core so as to pass through the hole in the same direction, and a holding case for holding a plurality of core pieces constituting the ferrite core wound with the cable in a combined state are provided.
  • the cable is wound around the ferrite core in such a manner that a plurality of through holes are sequentially passed through from one end side to the other end side of the ferrite core.
  • the cable is wound around the ferrite core in a form that passes through the through hole in the same direction from one end side to the other end side of the ferrite core.
  • the multiple wound cables are separated from each other via the partition wall, The stray capacitance between them becomes smaller.
  • the resonance point does not move to the low frequency region, and the impedance reduction in the high frequency region of the noise filter is suppressed.
  • the impedance in the high frequency range can be increased.
  • the plurality of through holes formed between the core pieces are sequentially 1 in the same direction from one end side to the other end side.
  • the cable can be wound around the ferrite core in a form that passes through, for example, a cable with a connector can be wound around the ferrite core in the same form.
  • the cable is wound around the ferrite core in a form passing through the through hole in the same direction from one end side to the other end side of the ferrite core. Impedance can be increased.
  • the multiple wound cables are separated from each other via the partition wall, and the cables are mutually connected.
  • the stray capacitance between them becomes smaller.
  • the resonance point does not move to the low frequency region, and as a result, a decrease in impedance in the high frequency region of the noise filter is suppressed. Therefore, according to the noise filter according to the present invention, the impedance in the high frequency region can be increased, and the high frequency noise can be effectively reduced.
  • FIG. 6 is an end view showing a first modification of the ferrite core shown in FIG. 2. It is an end elevation which shows the 2nd modification of the ferrite core shown in FIG.
  • FIG. 10 is an end view showing a third modification of the ferrite core shown in FIG. 2. It is an end elevation which shows the 4th modification of the ferrite core shown in FIG. It is an end elevation which shows the 5th modification of the ferrite core shown in FIG. It is an end elevation which shows the 6th modification of the ferrite core shown in FIG.
  • a noise filter 1 holds a ferrite core 2 made of a magnetic ferrite material, a cable 3 wound around the ferrite core 2, and a ferrite core 2 around which the cable 3 is wound.
  • a holding case 4 is provided.
  • the ferrite core 2 is formed in a substantially cylindrical shape in which a cylindrical inner space is partitioned into two through holes 2B and 2C by a partition wall 2A that crosses in the diameter direction.
  • the ferrite core 2 includes a core piece 2D formed in a half-cylindrical shape in which a cylinder is divided into two in the diameter direction along the axial direction, and a half-cylindrical inner surface corresponding to the core piece 2D. And a core piece 2E integrally formed with a partition wall 2A. These two core pieces 2D and 2E are combined in a substantially cylindrical shape as shown in FIG. 2, thereby forming two through holes 2B and 2C extending in the axial direction.
  • the cable 3 is, for example, a cable with a connector connected to an electronic device (not shown).
  • the cable 3 is wound around the ferrite core 2 so as to pass through the two through holes 2B and 2C.
  • the cable 3 passes through the two through-holes 2B and 2C in the same direction from the one end side to the other end side of the ferrite core 2 in a single layer. Wrapped around.
  • the cable 3 enters from one end portion of the through-hole 2B, exits from the other end portion, returns to one end portion of the through-hole 2C along the outer surface of the ferrite core 2, and further passes through one end of the through-hole 2C. It is wound around the ferrite core 2 so as to enter from one end and exit from the other end.
  • the holding case 4 is a case for accommodating and holding two core pieces 2D and 2E combined as a substantially cylindrical ferrite core 2 together with the inserted cable 3, and appropriately combining them. It is formed into a substantially cylindrical shape by resin.
  • a radially cut portion (not shown) extending along the axial direction, and a hinge portion (not shown) for enabling the holding case 4 to be opened and closed from the cut portion.
  • an engaging portion (not shown) for opening and closing the cutting portion is formed in the vicinity of the cutting portion.
  • the two core pieces 2D and 2E are combined as a substantially cylindrical ferrite core 2 as shown in FIG. 2, the two through holes 2B and 2C are formed.
  • a cable 3 with a connector that is connected to an electronic device (not shown) can be wound around the ferrite core 2 in a double manner in such a manner that it passes through the same direction sequentially from one end side to the other end side.
  • the cable 3 passes through the two through holes 2B and 2C from one end side to the other end side of the ferrite core 2, and the cable 3 is ferrite. Since it is wound twice around the core 2, the impedance rises.
  • the double-wrapped cable 3 passes through the partition wall 2A. As a result, the stray capacitance between the cables 3 is reduced.
  • the frequency characteristic of the impedance is a characteristic in which the resonance point is moved to the low frequency side as shown by the broken line graph in FIG.
  • the frequency characteristics of the impedance remain in the high frequency range without the resonance point moving to the low frequency range side, as shown by the solid line graph in FIG.
  • a decrease in impedance in a high frequency range exceeding, for example, 100 MHz is suppressed, and the impedance becomes larger than the impedance of the noise filter of the conventional example.
  • noise filter 1 of the present embodiment for example, impedance in a high frequency region exceeding 100 MHz can be increased, and high frequency noise exceeding 100 MHz can be effectively reduced.
  • the ferrite core and noise filter of the present invention are not limited to the above-mentioned one embodiment, and the structure can be changed suitably. it can.
  • the ferrite core 2 can be changed to one having a cross-sectional shape shown in FIGS.
  • the outer shape of the ferrite core is not limited to a cylindrical shape, and may be, for example, a rectangular tube shape.
  • the ferrite core 6 shown in FIG. 6 is formed in a substantially cylindrical shape having a cross-sectional shape partitioned into two through holes 6C and 6D by partition walls 6A and 6B that traverse the inner space of the cylinder in the diameter direction.
  • the ferrite core 6 is composed of two half-cylindrical core pieces 6E and 6F having a cross-sectional shape divided into two in the diametrical direction.
  • the inner surfaces of the two core pieces 6E and 6F are partitioned walls 6A and 6B, respectively. Are integrally formed.
  • a cable (not shown) can be wound twice around the ferrite core 6 in such a form that the two through holes 6C, 6D are sequentially passed in the same direction from one end side to the other end side.
  • the ferrite core 7 shown in FIG. 7 has a substantially cylindrical shape having a cross-sectional shape in which a cylindrical inner space is partitioned into three through holes 7D, 7E, and 7F by three partition walls 7A, 7B, and 7C extending radially from the center. Is formed.
  • the ferrite core 7 is composed of two core pieces 7G and 7H having a cross-sectional shape divided into two by a dividing line having a predetermined central angle.
  • One core piece 7G having a small central angle has two partition walls 7A. 7B are integrally formed, and one partition wall 7C is integrally formed on the other core piece 7H having a large central angle.
  • three unillustrated cables can be wound around the ferrite core 7 in such a manner that the three through-holes 7D, 7E, and 7F are sequentially passed in the same direction from one end side to the other end side. it can.
  • the ferrite core 8 shown in FIG. 8 has a cross-sectional shape in which a cylindrical inner space is divided into four through holes 8D, 8E, 8F, and 8G by three partition walls 8A, 8B, and 8C having cross-sectional shapes orthogonal to each other. It has a substantially cylindrical shape.
  • This ferrite core 8 is composed of two half-cylindrical core pieces 8H and 8I divided into two in the diametrical direction, and one core piece 8H has a cross section protruding radially toward the center of the cylinder.
  • the two partition walls 8A and 8B having a shape are integrally formed, and the other core piece 8I is integrally formed with one partition wall 8C having a cross-sectional shape projecting in the diameter direction of the cylinder perpendicular to the partition walls 8A and 8B. Has been.
  • the ferrite core 9 shown in FIG. 9 includes four partition walls 9A, 9B, 9C, and 9D having a cross-sectional shape that abuts in a cross shape at the center of the cylinder, so that the inner space of the cylinder has four through holes 9E, 9F, 9G, It is formed in a substantially cylindrical shape having a sectional shape divided into 9H.
  • the ferrite core 9 is composed of four core pieces 9I, 9J, 9K, 9L having a sectional shape equally divided into four in the circumferential direction. A cylindrical portion is formed from the center of the inner surface of the core pieces 9I, 9J, 9K, 9L.
  • the partition walls 9A, 9B, 9C, and 9D project toward the center.
  • the ferrite core 10 shown in FIG. 10 is composed of three core pieces 10A, 10B, and 10C having a cross-sectional shape that is equally divided into three in the circumferential direction from the center of the cylinder, and between the core pieces 10A, 10B, and 10C. Are formed with three through holes 10D, 10E, 10F having a circular cross section.
  • a cable (not shown) is wound around the ferrite core 10 in a triple manner in such a manner that the three through holes 10 ⁇ / b> D, 10 ⁇ / b> E, and 10 ⁇ / b> F are sequentially passed in the same direction from one end side to the other end side. it can.
  • a ferrite core 11 shown in FIG. 11 is composed of four core pieces 11A, 11B, 11C, and 11D having a cross-sectional shape that is divided into four equal parts in the circumferential direction from the center of the cylinder, and each core piece 11A, 11B, 11C, Four through-holes 11E, 11F, 11G, and 11H having a circular cross section are formed between 11D.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

L'invention concerne un noyau de ferrite qui peut accroître l'impédance dans une zone à haute fréquence, et un filtre de bruit qui utilise le noyau de ferrite. Dans un noyau de ferrite (2), lequel est formé en combinant deux pièces de noyau (2D, 2E), deux trous traversants (2B, 2C) qui traversent le noyau de ferrite dans la direction axiale sont formés entre les pièces de noyau (2D, 2E). Un câble (3) est enroulé autour du noyau de ferrite (2) deux fois en traversant les deux trous traversants (2B, 2C) d'une de leurs extrémités vers l'autre extrémité dans la même direction séquentiellement une fois pour chaque trou, et un filtre de bruit (1) est ainsi formé. Dans le filtre de bruit (1), l'impédance est accrue du fait que le câble (3) est enroulé autour du noyau de ferrite (2) deux fois, et parce que le câble (3) qui a été enroulé deux fois traverse les deux trous traversants (2B, 2C) séquentiellement une fois pour chaque trou, la capacité parasite entre les enroulements du câble (3) devient plus petite et une décroissance de l'impédance dans une zone à haute fréquence est supprimée.
PCT/JP2014/082505 2014-01-07 2014-12-09 Noyau de ferrite et filtre de bruit WO2015104936A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014000916 2014-01-07
JP2014-000916 2014-01-07

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WO2015104936A1 true WO2015104936A1 (fr) 2015-07-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110880720A (zh) * 2018-09-05 2020-03-13 矢崎总业株式会社 电线的布线构造和线束
EP3809427A1 (fr) * 2019-10-17 2021-04-21 Infineon Technologies Austria AG Dispositifs inducteurs et topologies d'alimentation électrique empilées
US11312245B2 (en) 2020-03-09 2022-04-26 Toyota Jidosha Kabushiki Kaisha Vehicle power supply system
US11394428B2 (en) 2019-04-01 2022-07-19 Infineon Technologies Ag Power regulation for lighting using NFC

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785756U (fr) * 1980-11-13 1982-05-27
JPH11354328A (ja) * 1998-06-08 1999-12-24 Kitagawa Ind Co Ltd 雑音電流吸収具
JP2010199413A (ja) * 2009-02-26 2010-09-09 Goyo Electronics Co Ltd 配設方法
JP2012104555A (ja) * 2010-11-08 2012-05-31 Kitagawa Ind Co Ltd フェライトコア及びチョーク

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5785756U (fr) * 1980-11-13 1982-05-27
JPH11354328A (ja) * 1998-06-08 1999-12-24 Kitagawa Ind Co Ltd 雑音電流吸収具
JP2010199413A (ja) * 2009-02-26 2010-09-09 Goyo Electronics Co Ltd 配設方法
JP2012104555A (ja) * 2010-11-08 2012-05-31 Kitagawa Ind Co Ltd フェライトコア及びチョーク

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110880720A (zh) * 2018-09-05 2020-03-13 矢崎总业株式会社 电线的布线构造和线束
US11394428B2 (en) 2019-04-01 2022-07-19 Infineon Technologies Ag Power regulation for lighting using NFC
EP3809427A1 (fr) * 2019-10-17 2021-04-21 Infineon Technologies Austria AG Dispositifs inducteurs et topologies d'alimentation électrique empilées
US11312245B2 (en) 2020-03-09 2022-04-26 Toyota Jidosha Kabushiki Kaisha Vehicle power supply system

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