EP0747913A1 - Oberflächenmontiertes elektronisches Bauelement mit gerilltem Kern und Verfahren zu seiner Herstellung - Google Patents

Oberflächenmontiertes elektronisches Bauelement mit gerilltem Kern und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0747913A1
EP0747913A1 EP96108606A EP96108606A EP0747913A1 EP 0747913 A1 EP0747913 A1 EP 0747913A1 EP 96108606 A EP96108606 A EP 96108606A EP 96108606 A EP96108606 A EP 96108606A EP 0747913 A1 EP0747913 A1 EP 0747913A1
Authority
EP
European Patent Office
Prior art keywords
electronic component
core
metal
windings
insulating layer
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.)
Granted
Application number
EP96108606A
Other languages
English (en)
French (fr)
Other versions
EP0747913B1 (de
Inventor
Anthony M. Pavio
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.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
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 Motorola Inc filed Critical Motorola Inc
Publication of EP0747913A1 publication Critical patent/EP0747913A1/de
Application granted granted Critical
Publication of EP0747913B1 publication Critical patent/EP0747913B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01F17/062—Toroidal core with turns of coil around it
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • 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
    • H01F17/0033—Printed inductances with the coil helically wound around a 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F2017/004—Printed inductances with the coil helically wound around an axis without a core

Definitions

  • This invention relates, in general, to transformers or inductors and more particularly, to surface mount components and a method for making such.
  • a basic transformer has at least two coupled wire coils around a center core.
  • the coils are formed from wires that are insulated from both each other and from the core and are wrapped around the core a predetermined number of turns.
  • Planar two dimensional transformers and inductors can be made by a sequence of depositing, patterning, and etching successive layers.
  • photolithography techniques to pattern transformers requires that the surfaces be flat and adds tremendous expense versus the hand wound method.
  • Typical surface mount transformers and inductors are formed by winding wire around a core section.
  • the size and pitch of the wire and the shape and composition of the core will determine the electrical characteristics of the component.
  • Large components are formed by using a mechanical means to wrap the wire by rotating a bobbin of wire through the center of the core.
  • Small components that are commonly used in many surface mount applications require that the metal windings be formed by hand wrapping the wire around the core. This is not only a timely and costly procedure, but variation in the tightness of the wrap and spacing between windings is introduced into the component. These variations will limit the precision of the component manufactured.
  • the present invention provides embodiments that allow for the elimination of hand winding electrical components.
  • the metal windings are carved from a sheet of metal that is formed on a core and then patterned with the use of grooves in the surface of the core. These grooves provide for a simplified manufacturing process that improves the precision of the components produced.
  • This invention also provides embodiments for fabricating a three dimensional electronic component that operates in a re-entrant mode. By operating in a re-entrant mode, the coupling between windings is improved which reduces the number of windings required and improves the operational bandwidth of the component.
  • FIG. 1 is an enlarged view showing a first embodiment of the current invention.
  • the details for fabricating a toroidal transformer 19 will be provided, however, the same methods can be used to form other electronic components that incorporate a core with wire wrapping such as an inductor or linear transformer.
  • a cylindrically shaped core 11 is used to provide the structure of transformer 19.
  • the core 11 is formed by a casting process used by those skilled in the art.
  • the composition of core 11 will depend on the electrical characteristics of the component fabricated.
  • the core material is an iron based magnetic material, but for other applications the core material can consist of a non-magnetic material, ceramic, or plastic.
  • Previously known methods for casting the core have formed the core with smooth surfaces.
  • the casting process involves filling a mold with the desired core material and heating the mold.
  • Core 11 then takes the shape provided by the mold.
  • two continuous grooves 12 and 17 are patterned on the surface of core 11 and delineate the two wires of toroidal transformer 19.
  • Grooves 12 and 17 are formed from the mold used to cast core 11 and are patterned such that grooves 12 and 17 encompass core 11.
  • Groove patterns 12 and 17 are pitched axially off the center of core 11 such that grooves 12 and 17 are essentially parallel to each other and that the pattern does not overlap onto itself.
  • Grooves 12 and 17 have several characteristics that can be adjusted to determine the performance of toroidal transformer 19. The depth, shape, or pitch (distance between two adjacent portions of grooves 12 and 17) is predetermined based on required performance of toroidal transformer 19.
  • metal wires of the component be insulated from the core. Electrical isolation is provided by an insulating layer formed overlying the surface of core 11 where metal windings 13 and 18 will be shaped. In the present embodiment, the entire surface of core 11 is coated with an insulating material such as paralyne. A metal film is then formed over the insulating layer by any of the techniques used by those skilled in the art.
  • the metal film can be any conductive material depending on the electrical properties required of transformer 19. Such materials include copper, silver, aluminum, gold, tungsten, titanium-nitride, titanium-tungsten or nickel.
  • the metal film is formed on the insulating layer both in grooves 12 and 17 and overlying the surface of core 11 between adjacent portions of the groove pattern.
  • the metal film is then selectively removed by scrapping the exposed surface of core 11.
  • the metal film can be removed by chemical etching, mechanical polishing, or the like.
  • Metal windings 13 and 18 are formed by a portion of the metal film that is left remaining in grooves 12 and 17 respectively.
  • the grooved patterns are used as a guide to remove the metal film from grooves 12 and 17 and form metal windings 13 and 18 on the surface of core 11 which are isolated by bordering portions of the grooved patterns.
  • Metal windings 13 and 18 replace the functionality of wires wrapped around a core in previously known methods for forming a transformer. There is no need to hand wind wire and the above mentioned embodiments can be scaled to manufacture a transformer of various sizes.
  • Typical surface mount components used in an integrated circuit are formed on cores that have an outer diameter of 1 mm to 100 mm and an inner diameter of 0.5 mm to 98 mm.
  • cores that have an outer diameter of 1 mm to 100 mm and an inner diameter of 0.5 mm to 98 mm.
  • the entire surface of core 11 need not be patterned with grooves 12 and 17.
  • the metal windings 13 and 18 are partially or completely formed by scrapping the surface of core 11 in a rifling pattern. A portion of the surface can be left smooth during the casting process and covered with the insulating layer and the metal film. The metal windings 13 and 18 are then formed by scrapping the smooth surfaces with a rifling pattern such that continuous metal windings 13 and 18 are formed.
  • one or more grooves can be formed on the surface of core 11.
  • a single groove that forms one metal winding will form an inductor or a precision inductor.
  • various electrical components can be formed. Possible components include a toroidal transformer 19 if at least 2 wires encircle a magnetic core, a linear transformer if at least two windings are formed around a non-magnetic core, or a plurality of coupled inductors are produced if the core is cylindrical in shape.
  • FIG. 2 is a top-down view of a fourth embodiment of the present invention.
  • Previously known methods for fabricating transformers for surface mount applications have limitations on the maximum frequency bandwidth that the component will reliably operate in due to the lack of electrical coupling between the wire windings around the core.
  • the coupling between windings 13 and 18 is improved so as to electrically seem that wire windings 13 and 18 are closer to each other than they really are.
  • the three dimensional electronic component shown in FIG. 2 has two metal windings 13 and 18 formed in grooves 12 and 17 respectively.
  • a second insulating layer 14 is formed overlying the two metal windings 13 and 18 and is made from any insulating material used by those skilled in the art such as paralyne.
  • a second metal film 16 is formed on insulating layer 14 such that metal film 16 overlaps at least a portion of metal winding 13 and metal winding 18.
  • This second metal film 16 can be deposited with a vapor deposition or in the preferred embodiment, formed by electroplating.
  • metal film 16 is shown to completely cover the outer surface of core 11.
  • Metal film 16 can also be formed to cover a portion of the inner opening or either the top or bottom surface of core 11 as well.
  • second metal film 16 is to reduce the capacitive load between metal winding 13 and metal winding 18 relative to the electrical ground voltage. By increasing the surface area second metal film 16 overlaps metal windings 13 and 18, coupling between metal windings 13 and 18 is improved.
  • the above mentioned embodiment can be used on any electrical component that has at least two metal windings and is not limited to transformers with windings formed by grooves in the core.
  • second metal film 16 the operating bandwidth of an electrical component is widened.
  • the lower limit frequency is determined by the coupling of the core material with the metal windings and the upper limit frequency is determined by the re-entrant mode coupling with second metal film 16.
  • FIG. 3 is a side view showing how an electronic component incorporating one or more of the above mentioned embodiments is attached to a PC board for surface mount applications.
  • Metal windings 13 and 18 (FIG. 1) are terminated on a surface of core 11 to form the bonding pads 22 and 23 respectively.
  • Solder or any other conductive material is formed on bonding pads 22 and 23 to provide electrical and physical contact to a PC board (not shown) in a variety of integrated circuit applications.
  • This invention presents several embodiments to reduce the cost of manufacturing surface mounted electronic components and that improve the precision of the components.
  • a method is provided for forming the metal windings of a transformer or inductor that does not require hand winding. By using grooves to pattern a metal film, the inaccuracies due to tightness of wrap, number of turns, and the pitch of the turns from hand winding can be eliminated.
  • An additional embodiment has been presented that improves the operational bandwidth by forming a three dimensional re-entrant mode component that improves the coupling between the metal windings of an electronic component.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP96108606A 1995-06-05 1996-05-30 Oberflächenmontiertes elektronisches Bauelement mit gerilltem Kern Expired - Lifetime EP0747913B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46442195A 1995-06-05 1995-06-05
US464421 1995-06-05

Publications (2)

Publication Number Publication Date
EP0747913A1 true EP0747913A1 (de) 1996-12-11
EP0747913B1 EP0747913B1 (de) 2000-10-04

Family

ID=23843885

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96108606A Expired - Lifetime EP0747913B1 (de) 1995-06-05 1996-05-30 Oberflächenmontiertes elektronisches Bauelement mit gerilltem Kern

Country Status (3)

Country Link
EP (1) EP0747913B1 (de)
JP (1) JPH08330142A (de)
DE (1) DE69610524T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003005579A1 (en) * 2001-07-04 2003-01-16 Koninklijke Philips Electronics N.V. Electronic inductive and capacitive component
EP2105937A1 (de) * 2008-03-28 2009-09-30 Sercomm Corporation Transformatorvorrichtung mit Abschirmarchitektur und Abschirmverfahren dafür
JP2016025150A (ja) * 2014-07-17 2016-02-08 株式会社村田製作所 トロイダルコイル
FR3097366A1 (fr) * 2019-06-17 2020-12-18 Commissariat A L'energie Atomique Et Aux Energies Alternatives Procede de fabrication d’un dispositif inductif

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3622459B2 (ja) * 1997-11-25 2005-02-23 松下電工株式会社 電磁装置
KR100433188B1 (ko) * 2001-08-28 2004-05-28 주식회사 쎄라텍 표면실장형 파워 인덕터 및 그 제조방법
JP2010182850A (ja) * 2009-02-05 2010-08-19 Asahi Denki Kenkyusho:Kk トロイダルコア、トロイダルコアの製造方法及びトロイダルコア製造用の金型
JP6106381B2 (ja) * 2012-08-21 2017-03-29 Ａｒｔ−Ｈｉｋａｒｉ株式会社 トランス及びトランスを搭載した装置
JP2024029578A (ja) * 2022-08-22 2024-03-06 ヤマハ株式会社 空芯コイル

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319207A (en) * 1963-07-18 1967-05-09 Davis Jesse Grooved toroidal body with metal filling
GB1243495A (en) * 1969-11-21 1971-08-18 Int Standard Electric Corp Electro-static shielding of toroidal transformers
DE2424715A1 (de) * 1974-05-21 1975-12-04 Messerschmitt Boelkow Blohm Wechselstromdurchflossene spule
JPS5878402A (ja) * 1981-11-04 1983-05-12 Yagi Antenna Co Ltd インダクタンス素子
US4748430A (en) * 1985-11-19 1988-05-31 Thomson-Cgr Air-cooled high-frequency current transformer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3319207A (en) * 1963-07-18 1967-05-09 Davis Jesse Grooved toroidal body with metal filling
GB1243495A (en) * 1969-11-21 1971-08-18 Int Standard Electric Corp Electro-static shielding of toroidal transformers
DE2424715A1 (de) * 1974-05-21 1975-12-04 Messerschmitt Boelkow Blohm Wechselstromdurchflossene spule
JPS5878402A (ja) * 1981-11-04 1983-05-12 Yagi Antenna Co Ltd インダクタンス素子
US4748430A (en) * 1985-11-19 1988-05-31 Thomson-Cgr Air-cooled high-frequency current transformer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CARR J J: "BUILDING YOUR OWN TOROID CORE INDUCTORS AND RF TRANSFORMERS", ELEKTOR ELECTRONICS, vol. 20, no. 219, 1 February 1994 (1994-02-01), pages 52 - 58, XP000430260 *
PATENT ABSTRACTS OF JAPAN vol. 007, no. 170 (E - 189) 27 July 1983 (1983-07-27) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003005579A1 (en) * 2001-07-04 2003-01-16 Koninklijke Philips Electronics N.V. Electronic inductive and capacitive component
EP2105937A1 (de) * 2008-03-28 2009-09-30 Sercomm Corporation Transformatorvorrichtung mit Abschirmarchitektur und Abschirmverfahren dafür
JP2016025150A (ja) * 2014-07-17 2016-02-08 株式会社村田製作所 トロイダルコイル
FR3097366A1 (fr) * 2019-06-17 2020-12-18 Commissariat A L'energie Atomique Et Aux Energies Alternatives Procede de fabrication d’un dispositif inductif
EP3754677A1 (de) * 2019-06-17 2020-12-23 Commissariat à l'énergie atomique et aux énergies alternatives Verfahren zur herstellung einer induktiven vorrichtung

Also Published As

Publication number Publication date
DE69610524T2 (de) 2001-05-17
EP0747913B1 (de) 2000-10-04
JPH08330142A (ja) 1996-12-13
DE69610524D1 (de) 2000-11-09

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