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WO1985001387A1 - Assemblage de bobine d'arret en ferrite - Google Patents

Assemblage de bobine d'arret en ferrite Download PDF

Info

Publication number
WO1985001387A1
WO1985001387A1 PCT/US1984/001370 US8401370W WO8501387A1 WO 1985001387 A1 WO1985001387 A1 WO 1985001387A1 US 8401370 W US8401370 W US 8401370W WO 8501387 A1 WO8501387 A1 WO 8501387A1
Authority
WO
WIPO (PCT)
Prior art keywords
center post
bobbin
winding
core
accordance
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/US1984/001370
Other languages
English (en)
Inventor
Hazen Curtis, Iii
Richard Charles Walker
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.)
AT&T Corp
Original Assignee
American Telephone and Telegraph Co 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 American Telephone and Telegraph Co Inc filed Critical American Telephone and Telegraph Co Inc
Priority to JP1985600006U priority Critical patent/JPH051049Y2/ja
Publication of WO1985001387A1 publication Critical patent/WO1985001387A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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
    • H01F17/041—Means for preventing rotation or displacement of the 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
    • H01F27/02—Casings
    • H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards

Definitions

  • the invention relates generally to inductance elements for electronic circuits and more particularly to choke coils of the type particularly suited for mounting on electronic circuit boards.
  • inductance element generally for the performance of some filtering function. Such is the case for circuits in telephone receivers. These circuits are subject to various types of electromagnetic noise which is best filtered out by an inductance.
  • the types of inductance elements commonly used for suppressing noise in electronic circuits are generally known as "choke coils". They are preferably designed so that they can be readily mounted on a circuit board along with the other circuit components present on it. Since this mounting procedure is separate from the processes for manufacturing the other circuit portions on the board, it is important that there be a minimum of complexity involved in the assembly process.
  • the novel choke coil in accordance with the present invention includes an E-core with a coil member on its central leg.
  • the legs and center post of the E-core extend beyond the end of the coil member, so that magnetic flux coupling between the legs and post is sufficient to permit significantly reduced winding turns in the coil member. This makes possible a reduced thickness dimension
  • the coil member includes one or more coils wound on a bobbin which slides onto the center post of the core.
  • the bobbin includes locking tabs which locks the core in place in its assembled position.
  • the coil member is asymmetrically configured to permit ready orientation by automated assembly equipment.
  • FIG. 1 is an elevated perspective view of a choke coil assembly in accordance with the preferred embodiment of the invention.
  • FIG. 2 is a top view of the choke coil assembly of FIG. 1.
  • FIG. 3 is an elevated perspective view of the choke coil assembly of FIG. 1 with the core disassembled from it.
  • FIG. 4 is an elevated perspective view of a bobbin of the choke coil of FIGs. 1 and 2 shown separately.
  • FIGS. 1 and 2 there is shown a choke coil assembly 10 which includes a bobbin assembly 12 fastened to a core member 14.
  • the core member 14 is shown removed from the bobbin asembly 12 in FIG. 3 of the drawings.
  • the core 14 is an E-core made of a ferrite ceramic material, such as, for example, a material designated as LRM382-L1 manufactured by the Western Electric Company in North Andover, Mass., in 1983.
  • the core 14 includes a base portion 16, two outer legs 18, 20 and a center post 22.
  • the vertical edges 24 at the end of the center post 22 are chamfered.
  • the bobbin assembly 12 includes a bobbin 26 which is molded of thermoplastic resin material. It is shown separately in FIG. 4.
  • the bobbin 26 has a central guide opening 28 for receiving the center post 22 of the core 14.
  • the outside vertical edges of 30 of the guide opening 28 are chamfered to facilitate horizontal alignment when the bobbin assembly 12 receives the center post 22.
  • Vertical alignment is provided by a pair of tongue-like lead-in members 31 extending out a short distance from the guide opening 28 and flaring out, away from it.
  • a pair of axially spaced end flanges 32, 34 are attached to a central cylindrical portion 36 of rectangular cross-section. Spaced midway between the flanges 32, 34 is partition 38 which axially divides the bobbin 26 into two winding spools.
  • Each of the flanges 32, 34 is provided with two holes 40 in its plane which each receive a terminal pin 44.
  • the terminal pin has a short coil wire wrap leg section 46 bent at a right angle and a mounting stem section 48.
  • the mounting stem section 48 includes a swaged segment 50 which deforms the inside wall of the receiving hole 40 to rigidly hold the pin 44 in place after it is assembled to the bobbin 26.
  • Four tongue-shaped locking tabs 52 extend from one flange 32. These are designed to engage the outer edges surface of the base 16 of the core 14 when the bobbin assembly is pressed against the base 16 on assembly and to firmly hold the core 14 in place.
  • FIG. 2 the bobbin assembly 12 is shown with the terminal pins 44 in place and each of the winding spools wound with a winding 54, 56 of copper wire.
  • the completed assembly of FIGS. 1 and 2 shows the ends of the windings 54, 56 wire-wrapped about the terminal legs 46.
  • the mounting stems 48 extend from the bottom of the assembly and are designed to readily attach to a circuit board.
  • the legs 18, 20 and center post 22 of the core 14 are significantly longer than the length of the guide opening 28 in the bobbin 26, so that they extend beyond the end of the outer winding 56 a distance of about 30% of their total length.
  • This provides magnetic flux coupling through the air gaps between the outside legs 18, 20 and the center post 22 which significantly increases the inductance value of the choke coil assembly 10. Without this feature it would be necessary, in order to obtain the same inductance value, to add more turns of wire to the windings 54, 56, thereby increasing the diameter of the windings 54, 56 and giving the entire choke coil assembly 10 a correspondingly greater thickness dimension. Since this thickness dimension is the dimension which determines the protrusion of the choke coil assembly 10 above the level of the circuit board to which it is mounted, this would be undesirable for many applications where space is at a premium.
  • the copper wire which forms the windings 54, 56 is of such a thickness that it serves as a fuse link for the circuit in which the choke coil assembly 10 is used. Most typically, this would be a telephone receiver circuit.
  • bobbin 26 It is an advantageous feature of the bobbin 26 that its configuration is asymmetrical. It is therefore more readily handled by automated assembly equipment. It is well known that automatic assembly equipment is more readily designed to handle asymmetrical pieces than symmetrical ones because it is easier to orient and align such pieces. The same can be said of the core 14.
  • the distance d that the center post 22 and the outside legs 18, 20 of the core 14 extend beyond the end of the outer winding 56 may vary within a range feasible for a particular application. Also, if the distance d is made much greater than about 30% of the total length of the legs 18, 20, and the post 22, no appreciable inductance will be added to the structure, and the core 14 is likely to become much more susceptible to breakage in handling.
  • coil assembly 10 includes two windings 54, 56, it will be readily apparent to those skilled in the art that the bobbin 26 could also be wound with a single winding or more than two. Moreover it could be readily modified to be specifically designed for a single winding. ⁇ JRE ⁇ -
  • the core 14 of the coil assembly 10 is an E-core having two outside legs 18, 20
  • a U-shaped core having only a single outer leg would also provide coupling in the air gap between the outer leg and the center post if these extended sufficiently beyond the outer winding. This would be an alternative structure which might be suitable for some purposes.

Landscapes

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

Abstract

Une bobine d'arrêt (10) comprend une bobine en résine thermoplastique (26) disposée autour de l'élément central (22) d'un noyau en ferrite céramique en E (14) et bloquée sur place par quatre pattes de verrouillage (52) s'étendant d'une extrémité de la bobine (26) jusqu'aux bords éloignés de la base (16) du noyau en E (14). La bobine (26) comporte deux enroulements (54, 56) pourvus de connexions séparées avec quatre broches terminales (44) s'étendant d'un côté de l'assemblage pour se fixer sur une carte de circuit. L'élément central (22) et les pattes externes (18, 20) du noyau (14) s'étendent au delà de l'extrémité de l'enroulement externe (56) pour y former un couplage mutuel du champ magnétique sans utiliser une pièce terminale, et de manière à accroître l'inductance du dispositif sans augmenter le nombre de spires des enroulements (54, 56). Les bords verticaux (24) de l'élément central (22) à l'extrémité libre et les bords correspondants (30) à l'intérieur de la bobine (26) à l'extrémité d'insertion sont biseautés pour en faciliter l'assemblage. Le fil de l'enroulement peut également servir de maillon fusible pour un circuit dans lequel l'on utilise la bobine d'arrêt.
PCT/US1984/001370 1983-09-19 1984-08-28 Assemblage de bobine d'arret en ferrite Ceased WO1985001387A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1985600006U JPH051049Y2 (fr) 1983-09-19 1984-08-28

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53311683A 1983-09-19 1983-09-19
US533,116 1983-09-19

Publications (1)

Publication Number Publication Date
WO1985001387A1 true WO1985001387A1 (fr) 1985-03-28

Family

ID=24124554

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1984/001370 Ceased WO1985001387A1 (fr) 1983-09-19 1984-08-28 Assemblage de bobine d'arret en ferrite

Country Status (4)

Country Link
JP (1) JPH051049Y2 (fr)
DE (1) DE8490152U1 (fr)
GB (1) GB2146847A (fr)
WO (1) WO1985001387A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991015021A1 (fr) * 1990-03-29 1991-10-03 SIEMENS AKTIENGESELLSCHAFT öSTERREICH Element de circuit inductif pour le montage de cartes imprimees
WO1996014644A1 (fr) * 1994-11-04 1996-05-17 Tridonic Bauelemente Gmbh Bobine de lissage
EP2860740A1 (fr) * 2013-10-14 2015-04-15 LSIS Co., Ltd. Dispositif magnétique comprenant une bobine élastiquement déformable selon sa longueur
EP4439084A1 (fr) * 2023-03-30 2024-10-02 Abb Schweiz Ag Dispositif de détection de courant

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4800357A (en) * 1988-03-04 1989-01-24 Black & Decker, Inc. Transformer support assembly
JPH0737292Y2 (ja) * 1988-03-23 1995-08-23 ティーディーケイ株式会社 ラインフイルタ用分割型ボビンとこの分割型ボビンを使用するラインフイルタ
GB2314689A (en) * 1996-06-26 1998-01-07 Gen Electric Coil assembly

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867785A (en) * 1953-03-06 1959-01-06 Ranza A Crumbliss Ignition coil
US3011140A (en) * 1960-08-01 1961-11-28 Gen Electric Coil insulating and lead anchoring means for transformers
US3265999A (en) * 1964-05-26 1966-08-09 Bell Telephone Labor Inc Bobbin with slotted flange for terminal access
US3332049A (en) * 1965-11-30 1967-07-18 Tdk Electronics Co Ltd Magnetic core unit with shielded winding
US3354417A (en) * 1966-02-17 1967-11-21 Hermetic Coil Co Inc Coil bobbin having projections extending beyond magnetic core
US3665358A (en) * 1971-02-09 1972-05-23 Collins Radio Co Reactor coil form
JPS5276634A (en) * 1975-12-22 1977-06-28 Hitachi Ltd Transformer
US4238753A (en) * 1978-06-02 1980-12-09 Trw Inc. Transformer core gapping and lead anchoring arrangement
US4352081A (en) * 1980-10-22 1982-09-28 Kijima Musen Kabushiki Kaisha Compact trans core

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL65135C (fr) * 1943-04-16 1900-01-01
GB1094506A (en) * 1965-10-12 1967-12-13 Mullard Ltd Thin-film circuit-assembly
FR2011902A1 (fr) * 1968-06-06 1970-03-13 Welding Research Inc
US3631534A (en) * 1969-09-05 1971-12-28 Matsushita Electric Industrial Co Ltd Variable inductance device
JPS5041580Y2 (fr) * 1971-08-31 1975-11-26
US3940662A (en) * 1974-03-14 1976-02-24 Whitewater Electronics, Inc. Saturable reactor for pincushion distortion correction
JPS51108343A (fr) * 1975-03-19 1976-09-25 Matsushita Electric Industrial Co Ltd
JPS5642127U (fr) * 1979-09-07 1981-04-17

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2867785A (en) * 1953-03-06 1959-01-06 Ranza A Crumbliss Ignition coil
US3011140A (en) * 1960-08-01 1961-11-28 Gen Electric Coil insulating and lead anchoring means for transformers
US3265999A (en) * 1964-05-26 1966-08-09 Bell Telephone Labor Inc Bobbin with slotted flange for terminal access
US3332049A (en) * 1965-11-30 1967-07-18 Tdk Electronics Co Ltd Magnetic core unit with shielded winding
US3354417A (en) * 1966-02-17 1967-11-21 Hermetic Coil Co Inc Coil bobbin having projections extending beyond magnetic core
US3665358A (en) * 1971-02-09 1972-05-23 Collins Radio Co Reactor coil form
JPS5276634A (en) * 1975-12-22 1977-06-28 Hitachi Ltd Transformer
US4238753A (en) * 1978-06-02 1980-12-09 Trw Inc. Transformer core gapping and lead anchoring arrangement
US4352081A (en) * 1980-10-22 1982-09-28 Kijima Musen Kabushiki Kaisha Compact trans core

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, VOL. 20 , NO. 4, Issued SEPTEMBER 1977, COIL RETAINER, NEMIER et. al. page 1323 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991015021A1 (fr) * 1990-03-29 1991-10-03 SIEMENS AKTIENGESELLSCHAFT öSTERREICH Element de circuit inductif pour le montage de cartes imprimees
WO1996014644A1 (fr) * 1994-11-04 1996-05-17 Tridonic Bauelemente Gmbh Bobine de lissage
EP2860740A1 (fr) * 2013-10-14 2015-04-15 LSIS Co., Ltd. Dispositif magnétique comprenant une bobine élastiquement déformable selon sa longueur
US9324492B2 (en) 2013-10-14 2016-04-26 Lsis Co., Ltd. Magnetic device
EP4439084A1 (fr) * 2023-03-30 2024-10-02 Abb Schweiz Ag Dispositif de détection de courant

Also Published As

Publication number Publication date
DE8490152U1 (de) 1985-08-14
JPH051049Y2 (fr) 1993-01-12
GB8423273D0 (en) 1984-10-17
GB2146847A (en) 1985-04-24
JPS61500001U (fr) 1986-01-23

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