WO2023042634A1 - インダクタ - Google Patents

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Publication number
WO2023042634A1
WO2023042634A1 PCT/JP2022/032005 JP2022032005W WO2023042634A1 WO 2023042634 A1 WO2023042634 A1 WO 2023042634A1 JP 2022032005 W JP2022032005 W JP 2022032005W WO 2023042634 A1 WO2023042634 A1 WO 2023042634A1
Authority
WO
WIPO (PCT)
Prior art keywords
central portion
magnetic core
flat conductor
inductor
thickness
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2022/032005
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
潔 高木
祐介 中村
正博 榎本
浩史 冨田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2023548381A priority Critical patent/JPWO2023042634A1/ja
Priority to US18/682,904 priority patent/US20240355523A1/en
Priority to CN202280061306.0A priority patent/CN117941019A/zh
Publication of WO2023042634A1 publication Critical patent/WO2023042634A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H01F17/04—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/24—Magnetic cores
    • H01F27/255—Magnetic cores made from particles
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00
    • 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
    • H01F2017/048—Fixed inductances of the signal type with magnetic core with encapsulating core, e.g. made of resin and magnetic powder

Definitions

  • the present disclosure relates to inductors used in various electronic devices.
  • an inductor is obtained by burying a flat conductor wire in a magnetic core formed by mixing a powdery magnetic material and a binder under pressure.
  • Patent Document 1 is known as prior art document information related to the above inductor.
  • the thickness of the flat conductor wire becomes thicker than the thickness of the magnetic core, there will be a difference in magnetic powder density between the part where the flat conductor wire is present and the part where the flat conductor wire is not present when viewed from the top during pressure molding of the magnetic core. occurred, and sufficient electrical characteristics could not be obtained.
  • An object of the present disclosure is to provide an inductor with low inductance that can withstand a larger current.
  • the inductor of the present disclosure includes a magnetic core obtained by mixing a powdered magnetic material and a binder and pressure-molding it, a flat plate conductive wire embedded in the magnetic core and extending linearly with the end portion protruding from the end surface of the magnetic core, Prepare.
  • the magnetic core consists of a central portion that covers the flat conductor, side portions provided on both sides of the central portion, and tapered portions provided between the central portion and the side portions. It is made thinner than the thickness of the central part.
  • the tapered portion causes the magnetic powder to flow toward the flat conductor wire, so that the magnetic powder density around the flat conductor wire is made uniform, and the electrical characteristics are improved. can be improved.
  • FIG. 1 is a transparent perspective view of an inductor according to an embodiment of the present disclosure
  • FIG. 1 is an external view of an inductor viewed from above according to an embodiment of the present disclosure
  • FIG. 1 is an external view of an inductor viewed from a side in an embodiment of the present disclosure
  • FIG. 2 is an external view of an inductor viewed from an end surface according to an embodiment of the present disclosure
  • Sectional view of an inductor according to an embodiment of the present disclosure Sectional view of an inductor according to an embodiment of the present disclosure
  • FIG. 4 is a cross-sectional view of a mold used in a manufacturing process of an inductor according to an embodiment of the present disclosure
  • FIG. 1 is a see-through perspective view of an inductor 10 according to an embodiment of the present disclosure
  • FIGS. 2A to 2C are external views of the inductor 10
  • FIGS. 3 and 4 are cross-sectional views of the inductor 10.
  • FIG. 2A is an external view seen from the top
  • FIG. 2B is an external view seen from the side
  • FIG. 2C is an external view seen from the end face.
  • FIG. 3 is a cross-sectional view (a cross-sectional view taken along line III--III in FIG. 2) taken along a plane perpendicular to the extending direction of the flat conductor wire 12. As shown in FIG. FIG. FIG.
  • FIG. 4 is a cross-sectional view (a cross-sectional view taken along line IV--IV in FIG. 2) taken along a plane including the extending direction of the flat conductor wire 12.
  • the extending direction of the flat conductor 12 is the x-axis
  • the direction from the central portion 11a of the magnetic core 11 to the side portion 11c is the y-axis
  • the direction perpendicular to the x-axis and the y-axis is the z-axis.
  • An xyz orthogonal coordinate system is provided.
  • the inductor 10 consists of a magnetic core 11 formed by mixing a powder magnetic material made of Fe--Si--Cr and a binder made of silicone resin and pressure-molded, and a flat conductor wire 12 embedded in this magnetic core 11.
  • the magnetic core 11 has a width of about 4.3 mm, a length of about 7 mm, and a height of about 1.2 mm.
  • the flat conductor wire 12 is formed by punching a copper plate with a thickness of about 0.5 mm into a width of about 1.2 mm, and is embedded in the magnetic core 11 so as to extend linearly from one end face of the magnetic core 11 to the other end face. ing. Plate conductors 12 protrude from both end surfaces of the magnetic core 11 and are bent from the end surfaces toward the bottom surface to form external electrodes 13 .
  • the thickness of the flat plate conductor 12 is reduced to about 0.25 mm from the vicinity of the portion protruding from the magnetic core 11 toward the outside. At this time, the thickness is reduced by pressing the side of the flat conductor wire 12 facing the bottom surface of the magnetic core 11 with a press die. By doing so, it becomes easy to bend the portion of the plate conductor 12 protruding from the end surface of the magnetic core 11 toward the bottom surface of the magnetic core 11 .
  • the magnetic core 11 has the thickest thickness of about 1.2 mm at the central portion 11a that covers the flat conductor wire 12 along its extending direction when viewed from above.
  • a tapered portion 11b is provided, and side portions 11c having a thickness of about 0.8 mm are provided on both sides of the tapered portion 11b. That is, the side portions 11c are thinner than the central portion 11a.
  • the width of the central portion 11a is about 1.9 mm
  • the width of the side portion 11c is about 1.0 mm.
  • Covering the flat conductor wire 12 along its extending direction means that the width of the central part 11a is made larger than the width perpendicular to the extending direction of the flat conductor wire 12, and the central part 11a is formed on both sides of the flat conductor wire 12 in the width direction. is protruding.
  • the angle between the central portion 11a and the tapered portion 11b is about 135°. If the thickness of the flat conductor wire becomes thicker than the thickness of the magnetic core, there will be a difference in magnetic powder density between the part where the flat conductor wire is present and the part where the flat conductor wire is not present when viewed from the top during pressure molding of the magnetic core. becomes more likely to occur, and the density becomes smaller in the part where the flat conductor wire does not exist. In contrast, in an embodiment of the present disclosure, a tapered portion 11b is provided between the central portion 11a and the side portion 11c so that the side portion 11c is thinner than the central portion 11a.
  • the angle between the tapered portion 11b and the central portion 11a By setting the angle between the tapered portion 11b and the central portion 11a to about 135°, the density of the magnetic powder on the side portion 11c is increased, and the tapered portion 11b causes the magnetic powder to flow more in the vicinity of the flat conductor wire 12. Magnetic powder density in the vicinity of the flat conductor wire 12 can be improved. In this way, the magnetic powder density can be made uniform, and the electrical characteristics can be improved.
  • the angle between the central portion 11a and the tapered portion 11b is preferably 110° or more and 160° or less. If this angle is smaller than 110° or larger than 160°, the tapered portion makes it difficult for the magnetic powder to flow in the vicinity of the flat conductor wire, making it difficult to achieve a uniform magnetic powder density. Furthermore, it is more preferable to set the angle between the central portion 11a and the tapered portion 11b to 120° or more and 150° or less.
  • the thickness of the flat conductor wire 12 is 20% or more and 70% or less of the thickness of the central portion 11a. If the thickness of the flat conductor wire 12 is less than 20% of the thickness of the central portion 11a, the effect of the technology of the present disclosure will be difficult to obtain, and if it is thicker than 70%, the amount of magnetic material above and below the flat conductor wire 12 will be small. Therefore, the electrical characteristics deteriorate.
  • a method for manufacturing an inductor according to an embodiment of the present disclosure will be described.
  • a copper plate is prepared, and the copper plate is punched out to form flat conductor wires 12 and external electrodes 13 .
  • the thickness of the portion to be the external electrode 13 may be reduced by partially pressing.
  • FIG. 5 shows a sectional view of the mold 14 used at this time. That is, FIG. 5 is a cross-sectional view of mold 14 used in the manufacturing process of inductor 10 according to an embodiment of the present disclosure. Note that an xyz orthogonal coordinate system is provided for FIG. The x-axis, y-axis, and z-axis are the same as in FIGS.
  • the upper punch 14a and the lower punch 14b of the mold 14 have a central portion 11a that covers the flat conductor wire 12 along its extending direction when the shape of the magnetic core 11 is viewed from the top, and a flat conductor wire 12 on both sides of the central portion 11a.
  • a tapered portion 11b is provided along the extending direction, and side portions 11c are formed on both sides of the tapered portion 11b.
  • the portions of the upper punch 14a and the lower punch 14b forming the tapered portion 11b are obliquely crossed with the portion forming the central portion 11a.
  • both the upper punch 14a and the lower punch 14b are provided with a region for forming the tapered portion 11b, but either one of them may be used.
  • the molded product is taken out from the mold 14 and the magnetic core 11 is hardened. After that, solder dipping is performed on the portion to be the external electrode, and this portion is bent toward the bottom surface of the magnetic core 11 to form the external electrode 13 and obtain the inductor 10 .
  • the inductor according to the present disclosure is industrially useful because it has a low inductance and can withstand a larger current.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
PCT/JP2022/032005 2021-09-16 2022-08-25 インダクタ Ceased WO2023042634A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2023548381A JPWO2023042634A1 (https=) 2021-09-16 2022-08-25
US18/682,904 US20240355523A1 (en) 2021-09-16 2022-08-25 Inductor
CN202280061306.0A CN117941019A (zh) 2021-09-16 2022-08-25 电感器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-150670 2021-09-16
JP2021150670 2021-09-16

Publications (1)

Publication Number Publication Date
WO2023042634A1 true WO2023042634A1 (ja) 2023-03-23

Family

ID=85602765

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/032005 Ceased WO2023042634A1 (ja) 2021-09-16 2022-08-25 インダクタ

Country Status (4)

Country Link
US (1) US20240355523A1 (https=)
JP (1) JPWO2023042634A1 (https=)
CN (1) CN117941019A (https=)
WO (1) WO2023042634A1 (https=)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003309024A (ja) * 2002-04-16 2003-10-31 Tdk Corp コイル封入型磁性部品及びその製造方法
JP2011530172A (ja) * 2008-07-29 2011-12-15 クーパー テクノロジーズ カンパニー 電磁デバイス
JP2012526383A (ja) * 2009-05-04 2012-10-25 クーパー テクノロジーズ カンパニー 磁気部品とその製造方法
JP2014090158A (ja) * 2012-10-03 2014-05-15 Tdk Corp インダクタ素子およびその製造方法
CN105355414A (zh) * 2015-12-06 2016-02-24 重庆市峰楠电子有限公司 一种电感的生产工艺
JP3213895U (ja) * 2017-09-26 2017-12-07 アルプス電気株式会社 チップインダクタ
JP2020161563A (ja) * 2019-03-25 2020-10-01 株式会社村田製作所 インダクタ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003309024A (ja) * 2002-04-16 2003-10-31 Tdk Corp コイル封入型磁性部品及びその製造方法
JP2011530172A (ja) * 2008-07-29 2011-12-15 クーパー テクノロジーズ カンパニー 電磁デバイス
JP2012526383A (ja) * 2009-05-04 2012-10-25 クーパー テクノロジーズ カンパニー 磁気部品とその製造方法
JP2014090158A (ja) * 2012-10-03 2014-05-15 Tdk Corp インダクタ素子およびその製造方法
CN105355414A (zh) * 2015-12-06 2016-02-24 重庆市峰楠电子有限公司 一种电感的生产工艺
JP3213895U (ja) * 2017-09-26 2017-12-07 アルプス電気株式会社 チップインダクタ
JP2020161563A (ja) * 2019-03-25 2020-10-01 株式会社村田製作所 インダクタ

Also Published As

Publication number Publication date
US20240355523A1 (en) 2024-10-24
JPWO2023042634A1 (https=) 2023-03-23
CN117941019A (zh) 2024-04-26

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