WO1985001387A1 - Ferrite choke coil assembly - Google Patents

Ferrite choke coil assembly Download PDF

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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
Application number
PCT/US1984/001370
Other languages
French (fr)
Inventor
Hazen Curtis, Iii
Richard Charles Walker
Original Assignee
American Telephone & Telegraph Company
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 & Telegraph Company filed Critical American Telephone & Telegraph Company
Priority to JP1985600006U priority Critical patent/JPH051049Y2/ja
Publication of WO1985001387A1 publication Critical patent/WO1985001387A1/en

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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.

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

Abstract

A choke coil (10) includes a thermoplastic resin bobbin (26) carried on the center post (22) of a ceramic ferrite E-core (14) and locked in position by four locking tabs (52) extending from one end of the bobbin (26) and grasping the remote edges of the base (16) of the E-core (14). The bobbin (26) carries two windings (54, 56) with separate connections to four terminal pins (44) extending from one side of the assembly for attachment to a circuit board. The center post (22) and the outer legs (18, 20) of the core (14) extend beyond the end of the outer winding (56) to provide mutual magnetic field coupling there without the need of an end piece and to thereby increase the inductance of the device without increasing the number of turns of the windings (54, 56). The vertical edges (24) of the center post (22) at the free end and the corresponding edges (30) inside of the bobbin (26) at the insertion end are chamfered to facilitate assembly. The winding wire may also serve as a fuse link for a circuit in which the choke coil is used.

Description

FERRITE CHOKE COIL ASSEMBLY
Technical Field
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. Background of the Invention
Numerous electronic circuits require as one of their components an 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. Also, since most of the other components of the circuit are either of a printed nature on the board or are relatively small integrated circuits, and since for any apparatus of this type space and volume are likely to be at a premium, it is desirable that the distance such a choke coil protrudes above the surface of the board be kept to a minimum. Summary of the Invention
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
O for the coil member, and hence for the entire choke coil element. This arrangement also provides for particularly fast and reliable assembly of the coil member with the E- core. 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.
Brief Description of the Drawing
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. Detailed Description
In 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.
Referring now back to 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.
It is another feature of the choke coil assembly 10 that 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.
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.
While the 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 ^-
O PI IPO Λ*
■ While 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.
Even a single locking tab can hold the bobbin in place on the core. However, a structure with two opposing locking tabs, or preferably four as in the above assembly 10, will provide a more reliable and firm attachment. It may be advantageous from the standpoint of the molding operation of the bobbin 26 that there by just two locking tabs which are diagonally opposed, rather than the four of the assembly 12.
OMPI '

Claims

Claims
1. An electrical inductance device, comprising: a coil member having at least one winding and an opening through the center of the winding, CHARACTERIZED BY a ferrite core member (14) including an elongated center post (22) and at least one outer leg (18, 20) parallel to, and spaced from, the center post (22) and joined to it at one end by a base ρortion(lδ) integral with the center post and outer leg (18, 20) , the center post being disposed in the coil member opening (28) and the outer leg being disposed adjacent the outside of the winding (54, 56), both the outer leg and the center post extending at their free ends a predetermined distance beyond the winding to provide magnetic field coupling between the leg and the center post.
2. The device in accordance with claim 1 , characterized in that the core (14) is an E-core having a second outer leg (20) parallel to, coplanar with, and spaced from the center post (22) and joined to it at one end by the base portion (16) , the second outer leg being disposed adjacent the outside of the winding (54, 56) opposite the first outer leg (18) and also extending the predetermined distance beyond the winding to provide magnetic field coupling between it and the center post.
3. The device defined in accordance with claim 2, characterized in that the coil member includes a bobbin (26) with two end flanges (32, 34) with central openings for receiving the center post (22), and a cylindrical hollow center portion (36), the winding being carried between the flanges and around the hollow center portion.
4. The device defined in according with any of claims 1-3, characterized in that at least one locking tab (52) is extending from the face of one of the flanges (32, 34) of the bobbin for engaging the outer edge of the base to hold the bobbin in place on the center post (22).
OMPI
5. The device in accordance with claim 4, characterized in that two pairs of opposed locking tabs (52) are extending from the flange (32, 34) of the bobbin to either side of the center post and engaging the edges of the base portion (16) of the core member (14) from the flange in locking fashion.
6. The device in accordance with claim 5, characterized in that the base portion, the legs, and the center post of the core member all have generally rectangular crossections.
7. The device in accordance with claim 6, characterized in that the bobbin includes a partition (38) spaced between the flanges and carries two windings (54, 56), one on each side of the partition.
8. The device in accordance with claim 7, characterized in that the flanges (32, 34) of the bobbin each contain at least one hole extending from through them in the plane of the flange have a terminal pin (44) inserted through the hole, one end (46) of the pin being bent at right angles and having the winding connected to it, the other end (48) extending from the bobbin for attachment to a circuit board.
9. The device in accordance with claim 8, characterized in that two opposed edges (24) of the center post (22) at its free end are chamfered to facilitate insertion of the center post into the opening of the bobbin.
10. The device in accordance with claim 9, characterized in that opposing inside edges of the opening (28) in the flange from which the tabs (52) extend are chamfered to facilitate insertion of the center post (22) into the opening of the bobbin.
11. The device in accordance with claim 10, characterized in that a pair of opposed tongue-like lead-in members are provided, flaring outward from the bobbin between the locking tabs at each side of the core.
PCT/US1984/001370 1983-09-19 1984-08-28 Ferrite choke coil assembly WO1985001387A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1985600006U JPH051049Y2 (en) 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 (en) 1985-03-28

Family

ID=24124554

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1984/001370 WO1985001387A1 (en) 1983-09-19 1984-08-28 Ferrite choke coil assembly

Country Status (4)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991015021A1 (en) * 1990-03-29 1991-10-03 SIEMENS AKTIENGESELLSCHAFT öSTERREICH Inductive circuit element for assembly of printed circuit broads
WO1996014644A1 (en) * 1994-11-04 1996-05-17 Tridonic Bauelemente Gmbh Filter choke
EP2860740A1 (en) * 2013-10-14 2015-04-15 LSIS Co., Ltd. Magnetic device with a bobbin which is lengthwise elastically deformable

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 (en) * 1988-03-23 1995-08-23 ティーディーケイ株式会社 Split type bobbin for line filter and line filter using this split type bobbin
GB2314689A (en) * 1996-06-26 1998-01-07 Gen Electric Coil assembly

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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
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JPS5276634A (en) * 1975-12-22 1977-06-28 Hitachi Ltd Transformer
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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
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991015021A1 (en) * 1990-03-29 1991-10-03 SIEMENS AKTIENGESELLSCHAFT öSTERREICH Inductive circuit element for assembly of printed circuit broads
WO1996014644A1 (en) * 1994-11-04 1996-05-17 Tridonic Bauelemente Gmbh Filter choke
EP2860740A1 (en) * 2013-10-14 2015-04-15 LSIS Co., Ltd. Magnetic device with a bobbin which is lengthwise elastically deformable
US9324492B2 (en) 2013-10-14 2016-04-26 Lsis Co., Ltd. Magnetic device

Also Published As

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

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