EP0105254A1 - Assemblage et moyens de montage ameliores de noyaux de ferrite - Google Patents

Assemblage et moyens de montage ameliores de noyaux de ferrite

Info

Publication number
EP0105254A1
EP0105254A1 EP82901455A EP82901455A EP0105254A1 EP 0105254 A1 EP0105254 A1 EP 0105254A1 EP 82901455 A EP82901455 A EP 82901455A EP 82901455 A EP82901455 A EP 82901455A EP 0105254 A1 EP0105254 A1 EP 0105254A1
Authority
EP
European Patent Office
Prior art keywords
ferrite core
core
ferrite
leg
core assembly
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
EP82901455A
Other languages
German (de)
English (en)
Other versions
EP0105254A4 (fr
Inventor
Joseph F. Huth Iii
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.)
Spang and Co
Original Assignee
Spang and Co
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 Spang and Co filed Critical Spang and Co
Publication of EP0105254A1 publication Critical patent/EP0105254A1/fr
Publication of EP0105254A4 publication Critical patent/EP0105254A4/fr
Ceased legal-status Critical Current

Links

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
    • H01F17/041—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
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/043—Fixed inductances of the signal type  with magnetic core with two, usually identical or nearly identical parts enclosing completely the coil (pot cores)
    • 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

  • This invention relates to core assemblies, and more particularly to improved ferrite core assemblies for inductor or transformer coils of the type commonly used on circuit boards for power supply circuits and the like.
  • ferrite cores are constructed in two parts, usually substantially identical half sections, assembled with mating surfaces to provide a desired low-reluctance path for flux resulting from current changes in the coil.
  • each core element is molded from a single homogeneous mass of ferrite material and includes a center post, a radially extending web and outer wall portions or skirts extending in spaced parallel rela ⁇ tion to the center post.
  • the mating surfaces of the skirt portions should be retained in direct, surface-to-surface engagement to provide a substantially continuous path for flux through the ferrite material in the skirt of the core.
  • the center posts on the two core elements may also be coplanar or spaced slightly to provide a controllable air gap. Inductance of a coil can be influenced both by improper contact between the core elements and by relative rotation of the core elements which tends to misalign mating outer wall portions. Misalignment may occur even though care is exercised to initially assemble the core elements in precisely aligned relation.
  • ferrite cores assembled with spring clips and other known devices have been widely used, such means have not been entirely satisfactory for various reasons.
  • the spring clip devices employed generally have not retained the core half sections clamped together with sufficient force to positively prevent relative rota ⁇ tion after assembly. This is due, in part, to the fact that the mating surfaces on the core elements are normally very smooth, low-friction surfaces.
  • the ferrite materia is relatively brittle and subject to chipping particularly upon application of excessive or unequal clamping forces which can result from threaded fastener assemblies.
  • the core element clamping structure as a means for attaching an assembled inductance device to a printed circuit board or the like.
  • downwardly projecting mounting pins, or supports have been employed for attachment directed to a printed circuit board by use of -soldering or by bending the pins.
  • Spacing elements have been employed on the clamping members for locating the inductance device a fixed distance from the surface of the board.
  • these mounting devices have not always been entirely satisfactory in that they have frequently been relatively expensive to manufac- ture and/or subject to distortion in handling.
  • Another object of the invention is to provide a core assembly wherein the component parts are more readily and easily assembled.
  • Another object is to provide such a core assembly which avoids the possibility of the core elements becoming misaligned after assembly.
  • Another object is to provide such a core assembly
  • Another object of the invention is to provide a core assembly including a spring clip assembly having improved means for retaining the core elements in assembled relation and for supporting the assembly on a circuit board in fixed spaced relation thereto.
  • the spring clip and mounting member is of generally U-shaped configuration, with the closed portion providing resilient spring means for engaging one ferrite core element and applying a tensile load to a pair of substantially straight inclined legs projecting one from each end of the resilient spring portion in p'osition to extend along and closely engage the skirt portions of the ferrite core elements on opposed sides of the assembly.
  • a substantially flat, inwardly directed retaining surface is positioned on each leg to snap over and engage the remaining ferrite element over an extended surface area when the central portion of the clip is resiliently deformed.
  • Each ferrite core element is formed with a pair of parallel aligning grooves, one on the outwardly directed surface of each skirt portion and extending along substan ⁇ tially its full length.
  • the aligning grooves are dimen ⁇ sioned to receive in a self-seating, snug fitting arrange ⁇ ment the straight leg portions of the retaining clip so that, when assembled, the legs of the spring clip extend within the aligning groove and firmly retain the core elements to prevent skewing of the parts relative to each other.
  • the aligning grooves each preferably have side walls which are slightly inclined outwardly from a smooth bottom wall to engage the edges of the spring clip legs in a self-seating manner to align the grooves in the two core elements during assembly.
  • the legs of the spring clip are preferably inclined toward one another form the central portion of the spring clip in the unstrained condition and apply a resilient inwardly directed force against the ⁇ aligning grooves, with the chamfered edges of the grooves engaging the edges of the legs to firmly retain the assembly against relative twisting movement after assembly.
  • the spring clip is preferably formed from a single length of relatively thin sheet metal spring stock with mounting posts which can be provided with integral spacing
  • FIG. 1 is an isometric view of an inductance device incorporating the present invention
  • FIG. 2 is an exploded, isometric view of the core assembly employed in FIG. 1;
  • FIG. 3 is an elevation view of the spring clip and mounting element shown in FIGS. 1 and 2;
  • FIG. 4 is a bottom plan view of the structure shown in FIG. 3;
  • FIG. 5 is a view showing one step in the produc ⁇ tion of the spring clip
  • FIG. 6 is a top plan view of one of the ferrite core elements shown in FIG. 1;
  • FIG. 7 is a bottom plan view of a winding bobbin employed in the assembly of FIG. 1;
  • FIG. 8 is an isometric view of an alternate embodi ment of the spring clip shown in FIGS. 1 - 4.
  • FIG. 1 a trans- former suitable for use in a power supply circuit and embodying the present invention is illustrated in FIG. 1 and designated generally by the reference numeral 10.
  • the transformer assembly includes a ferrite body made up of a pair of substantially identical core elements, of half sections 12, 14, arranged in mirror image, abutting rela- tion and support a coil 16 wound on a bobbin 18. The core and coil are clamped together by a resilient spring clip and mounting element 20.
  • ferrite core elements 12 and 14 preferably are substantially identical, only element 12 will be described in detail, it being understood that the descrip ⁇ tion also applies to element 14,- and like reference numeral will be employed to designate corresponding parts of both core elements. Also, it should be apparent that the precise geometry of the core elements may be varied as required to produce the desired electromagnetic qualities of the trans ⁇ former without departing from the invention.
  • ferrite core element 12 includes a cylindrical center post 22 integrally formed on and extending at right angles from the central portion of a web member 23.
  • Web 23 is made up of two substantially identical, diametrically opposed sections 24, 25.
  • a pair of outer wall portions, or skirts, 26, 28, are integrally formed one on each web section 24, 25; skirts 26, 28 extend parallel to and in outwardly spaced relation from the center post 22.
  • Skirt portions 26, 28, respectively have cylindrical inwardly directed surfaces 30, 32, respectively, cooperating with the cylindrical center post 22 to define an arcuate space for receiving coil 16 in a conventional manner.
  • skirts 26, 28, have an aligning groove formed in their outwardly directed surface extending parallel to the center post 22.
  • skirt 26 has an aligning groove defined by recessed planar surface 34 and inclined wall portions 38, 40
  • skirt 28 has a similar aligning groove defined by recessed planar surface 36 and outwardly inclined wall portions 42, 44.
  • the transverse width of surfaces 34, 36 is much greater than that of inclined wall portions 38, 40, 42, 44 so that the aligning grooves are relatively wide but very, shallow.
  • the free end surfaces 46, 48, respectively, of skirts 26 and 28 are smooth and extend in coplanar relation to one another.
  • Surfaces 46, 48 are parallel to and may be coplanar with the flat end surface 50 of center post 22 or alternatively surface 50 may be recessed from the plane of surfaces 46, 48 whereby, when the two ferrite core elements 12, 14 are assembled together, the center posts of the two elements are spaced from one another to provide a short air gap.
  • the spring clip and mounting member 20 employed to hold the two ferrite core elements 12, 14 in assembled relation is preferably formed from flat metal spring stock bent to a generally channel or U-shaped configuration defined by centrally located, concave tensioning member 52 at the closed end of the "U" and a pair of straight legs 54, 56 converging toward each other extending from each end of web 52.
  • An inwardly directed substantially flat flange, or retaining surface area 58 is formed spaced from tensioning member 52 toward the free end portion of leg 54, and a similar flange 60 is formed on and similarly spaced toward the free end portion of leg 56.
  • the flanges 58, 60 are spaced from tensioning member 52 a distance such that, when the inner surface of tensioning member 52 is positioned against the outer surface of center post 22 on web 23 of the ferrite core element 12, the concave tensioning member 52 must be deflected to enable the flanges 58, 60 to be hooked over and engage the flat outer surface of ferrite core element 14 In this position, the resilient spring force of the ten ⁇ sioning member 52 applies a continuous axially directed clamping force holding the opposed surfaces 46, 48 of the two ferrite elements in firm contact providing a substan- tially continuous path for lines of flux through the abutting skirt portions of the two core assemblies.
  • the transverse width of spring clip legs 54, 56 corresponds to the transverse width of the recessed surfaces 34, 36, respectively and the length of the tensioning member 52 is such that, when assembled, the opposing surfaces of legs 54, 56 fit within the slots defined in part by surfaces 34, 36. Since legs 54, 56 normally converge, a resilient radial clamping force is applied toward the surfaces 34, 36. This clamping action is increased by the straightening, or resiliently deflecting tensioning member 52 upon final assembly, thus assuring accurate alignment of the core elements both from the standpoint of rotation and lateral displacement.
  • the recessed grooves defining these surfaces are preferably slightly wider at their entrances to facilitate assembly.
  • the inclined surfaces 38, 40 can engage the side edges of leg 54 and surfaces 42, 44 can engage the side edges of leg 56 to provide a self-seating action tending to correct any slight misalignment of the tow core elements during assembly.
  • these inclined surfaces will act as an abuttment or shoulder engaging the edges of the legs of the spring clip and mounting assembly to posi ⁇ tively prevent misalignment resulting from handling, vibration or the like.
  • a pair of mounting posts 62, 64 is integrally formed on and project from the free end portion of leg 54 and a similar pair of mounting posts 66, 68 is formed on the free end portion of leg 56.
  • Mounting posts 62, 64, 66, 68 may be employed to mount the transformer assembly 10 on a printed circuit board or the like in the conventional manner, and spacing lugs 70, 72, 74 and 76, respectively formed on the side edge portion of mounting posts 62, 64,
  • 66, 68, respectively, can be provided to space the trans- former from the surface of the printed circuit board if desired.
  • the clip and mounting member 20 can be formed from a single length of flat metal spring stock 78 by initially removing, as by a die cutting operation, a generally rectangular section from each free end of the metal strip. Either at .the same time, or in a subsequent operation a pair of diverging slits is made from the bottom of each cut-out portion into the- body of the spring stock to form a pair of tongues 80, 82 which are deflected at substantially right angles to the body of the flat metal to form the flanges 58, 60.
  • the slits can be formed to leave the generally triangular shaped spacing lugs on the opposing surface of the mounting posts.
  • the slits defining the tongues employed to shape the clamping flanges may be a continuation of the die cuts employed to form the mounting posts at each end of the strip of spring stock.
  • the body of the spring stock can then be bent to the configuration shown in FIG. 4.
  • the spacing lugs 70, 72, 74 and 76 5 may be deformed from the plane of the mounting posts as shown in FIG. 1.
  • the center posts 22 of core elements 12, 14 extend through a central, axial opening 90 in the generally spool-shaped bobbin 18 to support the coil 16 within the
  • Bobbin 18 has a segmented flange 92 at each end for retaining the coil 16, with the flange segments having a shape corresponding to and extending closely adjacent the hourglass-shaped surface of web sections 24, 25 and center post 22. To retain the bobbin
  • a short, axially extending skirt element 94 extends along the outer peripheral edges of the flanges 92 with the skirt elements conforming to the contour of the side edge surfaces of web elements 24, 25 and the adjacent Q edge surfaces of the skirts 26, 28.
  • a terminal pin mounting flange 96 projects laterally from the skirt elements 92 on one end of the bobbin and supports a plurality of terminal pins 98 for connection in an electrical circuit.
  • the skirts 25 94 on the end of the bobbin having the terminal pins mounted thereon are slightly longer than the thickness of the ferrite web elements 24, 25 to provide protection for electrical leads extending from the terminal pins to the coil 16 from contacting the core element.
  • the skirts 94 which project downwardly from the outer surface of core element 14, will space the ferrite core slightly from the supporting surface without benefit of the spacing lugs on the retaining clip mounting posts.
  • the mounting posts and the elongated legs of the spring clip and mounting member extend in coplanar relationship and in parallel relation to the terminal pins.
  • the spring clip and mounting member is also generally U-shaped, including a resilient central portion 102, with substantially straight legs 104, 106 projecting one form each end of the resilient center portion. Legs 104, 106, terminate in inwardly directed retaining flanges 108, 110, respectively, for snapping over and engaging one core element when the other core element is in engagement with the resilient central portion.
  • the retaining flange, legs, and central portion may be of uniform width as illustrated in FIG. 8.
  • Integrally formed on and projecting laterally fro legs 104,-106 are support members or mounting posts 112, 114, respectively, terminating at their distal ends in attachment tab members 116 118, respectively, of-reduced section adapted to be secured, as by bending, soldering, or the like, to a circuit board. Shoulders formed at the juncture of the attachment tabs and their associated moun ⁇ ting post serve to retain the transformer in spaced rela ⁇ tion to the supporting surface.
  • Mounting posts 112, 114 are shaped to avoid contact with the edge surfaces of the aligning grooves in the ferrite core elements.
  • the resilient spring clip will always be required to apply a clamping pressure generally parallel to the longitudinal axis- of the center posts.
  • the aligning grooves will similarly extend parallel to the center post, and conse ⁇ quently perpendicular to the abutting surfaces 46, 48 of the skirt portion of the core elements when assembled.
  • the ferrite core assemblies described provide improved electromagnetic characteristics through accurate and reliable alignment of the two core elements. Further, inadvertent misalignment of the core elements as * a result of handling, vibration or the like is avoided by the cooperation of the spring clip and mounting member with the relatively wide, shallow aligning grooves integrally formed in the ferrite core elements.
  • the spring clip not only provides uniform reliable clamping pressure and minimizes the likelihood of inadvertent damage to the ferrite element during assembly, but also readily lends itself to -use in mounting the core assembly on a mounting board in spaced relation thereto by use of the spacing lugs " on the mounting posts.
  • the mounting posts may be employed to mount the core directly onto a support surface by eliminating the spacing lugs.
  • the chamfered, or trough- shaped aligning grooves facilitate assembly and assure alignment of the core elements.
  • the retaining clip is made from a thin sheet metal spring stock, the legs of the clip and conse ⁇ quently the aligning grooves are relatively wide in
  • the aligning grooves can be very shallow and still provide the necessary aligning function.
  • the aligning grooves will have a width at least ten times, and preferably at least twenty times their depth. Pre ⁇ ferably the depth of the grooves is at least equal to but not substantially greater than the thickness of the metal legs of the retaining clip.
  • the ferrite core assembly has been described with -particular reference to a transformer of the type frequently used in power supply circuits and the like where relatively high currents are employed.
  • the flux density in the core is high even with the employment of relatively larger masses of ferrite material in the core.
  • minor misalignment of the two ferrite core elements can produce unacceptable variations in the electromagnetic characteristics of the transformer.
  • the inven ⁇ tion is not limited to any particular inductance device or to any specific geometric configuration or electromagnetic characteristics of the ferrite core assembly.
  • the core assembly may be a so-called E-core, pot core, or other known configuration as well as the configuration described hereinabove.
  • the core assembly may be of the variably reluctance type wherein the center post is conven ⁇ tionally formed as a tubular element and dimensioned to
  • OMP ⁇ provide a substantial air gap between opposing surfaces of the two center post elements, and wherein a ferrite plug is ovably mounted within the hollow center of the posts to vary the reluctance across the air gap.

Landscapes

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

Abstract

L'inductance d'une bobine peut être influencée aussi bien par un mauvais contact entre les éléments de noyau que par la rotation relative des éléments de noyau, ce qui provoque un mauvais alignement entre les parois extérieures de couplage. Un agencement amélioré de noyau et de bobine, facilement assemblé et pouvant être monté de façon appropriée sur un panneau de circuit, permet d'éviter un mauvais alignement des noyaux. L'assemblage de noyau amélioré (10) comprend une paire d'éléments de noyau en ferrite (12, 14) adaptés pour recevoir une bobine (16) enroulée sur une carcasse de bobine (18) et pour être assemblés et maintenus dans un alignement précis et bout à bout par une pince à ressort et un organe de montage combinés (20). Chaque élément de noyau comporte une paire de creux relativement larges et peu profonds qui coopèrent une fois assemblés pour définir une paire de cannelures d'alignement s'étendant sensiblement à la perpendiculaire des surfaces de couplage des éléments de noyau, sur toute la longueur de l'assemblage et sur des côtés opposés de celui-ci. L'unité de pince à ressort et d'organe de montage (20) comprend une partie élastique (52) adaptée pour engager un élément de noyau (12), une paire de branches sensiblement droites (54, 56), adaptées pour s'ajuster longitudinalement et étroitement chacune dans une des cannelures d'alignement de l'assemblage de noyau (10), et une bride dirigée vers l'intérieur (58, 60) sur chaque branche, adaptée pour s'ajuster autour de l'élément de noyau restant (14) en l'engageant et en serrant fermement les deux éléments de noyau bout à bout. Des piliers allongés de montage (62, 64, 66, 68) peuvent être intégralement formés sur les branches, et un ergot saillant (70, 72, 74, 76) peut être intégralement formé sur chaque pilier de montage pour faciliter le montage de l'assemblage sur une structure de support, telle qu'un panneau de circuit imprimé.
EP19820901455 1982-03-29 1982-03-29 Assemblage et moyens de montage ameliores de noyaux de ferrite. Ceased EP0105254A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1982/000396 WO1983003495A1 (fr) 1982-03-29 1982-03-29 Assemblage et moyens de montage ameliores de noyaux de ferrite

Publications (2)

Publication Number Publication Date
EP0105254A1 true EP0105254A1 (fr) 1984-04-18
EP0105254A4 EP0105254A4 (fr) 1984-08-10

Family

ID=22167900

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820901455 Ceased EP0105254A4 (fr) 1982-03-29 1982-03-29 Assemblage et moyens de montage ameliores de noyaux de ferrite.

Country Status (3)

Country Link
EP (1) EP0105254A4 (fr)
JP (1) JPS59500538A (fr)
WO (1) WO1983003495A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5067917A (en) * 1989-09-06 1991-11-26 Eldec Corporation Component mounting frame
GB2286292A (en) * 1991-03-28 1995-08-09 Inc Motorola Single turn ferrite rod antenna and method for mounting such
GB2314689A (en) * 1996-06-26 1998-01-07 Gen Electric Coil assembly
DE202006015611U1 (de) * 2006-10-11 2008-02-21 Vogt Electronic Components Gmbh Induktives Bauelement
US8320136B2 (en) * 2007-08-31 2012-11-27 Intersil Americas Inc. Stackable electronic component
DE102007046503A1 (de) * 2007-09-28 2009-04-09 Epcos Ag Klammer für Planarkerne
DE102008017314B4 (de) * 2008-04-04 2015-10-29 SUMIDA Components & Modules GmbH Induktives Bauelement und elektronische Schaltung zur Ansteuerung einer Leuchte
CN105469947B (zh) * 2016-01-08 2017-11-03 苏州大学 一种高温度稳定性电感
CN110635663B (zh) * 2018-06-05 2024-03-15 Abb瑞士股份有限公司 集成磁组合件和将其组装的方法
JP7298545B2 (ja) * 2020-05-27 2023-06-27 株式会社村田製作所 コイル部品および電子部品
US20230368960A1 (en) * 2022-05-13 2023-11-16 Raytheon Company Surface mount compatible planar magnetics for high shock environments

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US4283699A (en) * 1980-03-06 1981-08-11 Siemens Aktiengesellschaft Holder for an electromagnetic coil

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US3197167A (en) * 1963-04-01 1965-07-27 Gen Electric Mounting clip for pot core
DE1439276A1 (de) * 1963-08-09 1968-10-24 Siemens Ag Elektrische Spule fuer gedruckte Schaltungen
FR1400837A (fr) * 1964-07-09 1965-05-28 Siemens Ag Bobine électrique pour circuits imprimés
US3371301A (en) * 1966-11-07 1968-02-27 Tdk Electronics Co Ltd Magnetic core unit
DE1811045C3 (de) * 1968-11-26 1973-11-15 Siemens Ag, 1000 Berlin U. 8000 Muenchen Abgleichbare Schalenkernspule fur gedruckte Schaltungen
DE2724022A1 (de) * 1977-05-27 1978-12-07 Standard Elektrik Lorenz Ag Elektrische spule mit massekern
GB2035706B (en) * 1978-11-09 1983-05-05 Tdk Electronics Co Ltd Inductance element

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US4283699A (en) * 1980-03-06 1981-08-11 Siemens Aktiengesellschaft Holder for an electromagnetic coil

Non-Patent Citations (1)

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Title
See also references of WO8303495A1 *

Also Published As

Publication number Publication date
EP0105254A4 (fr) 1984-08-10
JPS59500538A (ja) 1984-03-29
WO1983003495A1 (fr) 1983-10-13

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