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EP1019926B1 - Induktives bauelement und verfahren zur herstellung eines solchen bauelements - Google Patents

Induktives bauelement und verfahren zur herstellung eines solchen bauelements Download PDF

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Publication number
EP1019926B1
EP1019926B1 EP97943031A EP97943031A EP1019926B1 EP 1019926 B1 EP1019926 B1 EP 1019926B1 EP 97943031 A EP97943031 A EP 97943031A EP 97943031 A EP97943031 A EP 97943031A EP 1019926 B1 EP1019926 B1 EP 1019926B1
Authority
EP
European Patent Office
Prior art keywords
winding
core
coil
elements
inductive component
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.)
Expired - Lifetime
Application number
EP97943031A
Other languages
English (en)
French (fr)
Other versions
EP1019926A1 (de
Inventor
Jean-François KUMMEL
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.)
Microspire SA
Original Assignee
Microspire SA
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 Microspire SA filed Critical Microspire SA
Publication of EP1019926A1 publication Critical patent/EP1019926A1/de
Application granted granted Critical
Publication of EP1019926B1 publication Critical patent/EP1019926B1/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
    • H01F17/043—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
    • H01F27/28—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
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
    • H01F41/12—Insulating of windings
    • H01F41/127—Encapsulating or impregnating

Definitions

  • the present invention relates to components inductive, of the type comprising one or more windings, and can therefore be used depending on the case of inductance or alternating current transformer.
  • Such components as inductors, are generally used for perform in electrical or electronic circuits filtering or smoothing, or storage functions of energy, being conventionally traversed by currents with a continuous component to which superimposes an alternative component.
  • a current range operating frequency is 10 KHz to 3 MHz.
  • Of such components are for example commonly used in switching power supplies, or converters direct current.
  • These components are also conventionally made so that they can be fitted on printed circuits, in a manner known per se.
  • connection pins Conventionally, especially for reduce the surface dimensions on the printed circuit, the toroidal windings are arranged vertically on the base, so as to extend perpendicular to the surface of the printed circuit. The ends of the wires are connected to the connection pins, or form themselves the said pins, which are intended to be inserted into holes in the printed circuit and soldered thereon, in a classic way.
  • CMS component type mounted in surface
  • Document DE 195 44915 shows a so-called component "extra-flat", in particular for surface mounting of a printed circuit, which has a coil and a core two parts, placed on either side of the coil, and being housed in a recess passing through a pre-molded support, which carries side projections on which the ends of the coil wires are rolled up to form the connection terminals.
  • the core and coil are glued to the support with a adhesive.
  • the magnetic materials used for the O-ring are generally powder-based of iron, for example iron-silicon, when the frequency intended use is low, up to around 100 KHz, or, when the frequencies are higher, up to about 200 KHz, made of ferronickel alloy such as permalloy, for example the material commonly known as the name of Moly-Permalloy or MPP, which is a 80 or 50% iron and nickel sintered powder nickel.
  • toroidal type windings are not waterproof, the wire windings being simply made around the toric nucleus without external protection.
  • the object of the present invention is to resolve these problems and is particularly aimed at providing a component inductive with reduced weight and volume, limiting losses during high frequency use, and the assembly can be facilitated and automated by authorizing making these components in the form of components for surface mounting (CMS).
  • CMS surface mounting
  • a component according to the invention occupies for example a volume of 1200 mm 3 while an equivalent inductance with toric core has a volume of the order of 3240 mm 3 .
  • the body for example in epoxy resin thermosetting, molded directly onto the coil and connections, ensures high mechanical resistance, good dissipation of losses caused by current flow through the winding, and good sealing allowing use of the component in humid environment. Failure to include the nucleus of ferrite in the casting, but to bring it around the body, and apparent externally, further improves the dissipation of thermal energy, generated in particular by eddy currents, thanks to direct contact a large area of the outer surfaces of the nucleus with the exterior and the possibility of easily associating a heat sink.
  • the core is made up of two elements extending respectively on each of the faces of the body, one at less of said elements having an E-shape whose central branch passes through the opening of the body and extreme branches pass on two opposite sides of the said body.
  • This arrangement offers, at identical volume, by compared to the use of ferrite cores produced in known forms, for example a toric form, a much larger section of iron. At the level equivalent induction, the number of turns of the winding can therefore be reduced, which reduces losses in the common thread, and consequently authorizes a current most important.
  • This realization of the ferrite cores allows by elsewhere to easily accommodate in the magnetic circuit an air gap between the two constituent elements of the core, at the end faces of at least one of the branches of E.
  • This air gap can be adapted for example by playing on the respective lengths of the branches of the E.
  • This air gap allows the core to bear a large continuous field, and correspondingly, for a given field, reduce the volume of the nucleus.
  • the two elements of the nucleus are glued 1, one on the other, during their installation of on either side of the body.
  • the glue joint produced by a non-magnetic glue at the interface between the two core elements can otherwise be placed in the air gap mentioned above, at one or several of the branches of E.
  • the maintenance of the nucleus on the body can be completed with a glue joint extra arranged between the edges of the elements of the nucleus and body, especially on the sides of the component.
  • studs of connection emerge from the body at the face lower body, on two sides of the body opposite by in relation to said median plane. These studs are joined with the body by overmolding.
  • the outer ends of these studs can be shaped to form pins for classic mounting on a printed circuit. They will however preferably be shaped so forming legs extending in the plane of the surface lower part of the body, or slightly beyond it, allowing to fix the component on the printed circuit by welding these tabs to the surface of said circuit, according to the technique known for CMS components.
  • the legs Besides their mechanical fixing function by soldering on the printed circuit, the legs, at least those to which the ends of the or windings, of course are used for their connection electric.
  • the CMS type according to the invention which resides in the large contact surface possible between the legs and the printed circuit, which provides very good connection resistances weak and large currents. This advantage is even more marked, when, as can be achieved in case the component has only one winding, this winding is connected to connections which extend the full length of the sides of the component.
  • inductive components according to the invention can be packaged in tape to be used by laying machines automatic, flattened format and low weight authorizing automatic installation by suction or by claws.
  • the winding is carried out with a wire comprising an external thermo-adherent layer, and, after winding, a current is passed through the wire electric of sufficient intensity to heat it up and obtain the adhesion of the turns between them.
  • the inductance shown in Figure 1 has a body 1, from which emerge on each side of the connection lugs 2, and a magnetic core 3 made of ferrite.
  • the body is by example in thermosetting epoxy resin, or in a similar material suitable for shaping by overmolding on a coil 4, as seen in particular Figures 8 and 11.
  • the core is made up of two elements 31 having an E-shaped section, placed on the side and on the other side of the body.
  • the ferrite used is for example power ferrite type, with low losses, with a frequency of use of 10 KHz to 5 MHz and a relative permeability from 200 to 2500, or any type of ferrite with high relative permeability, around 3000 at 15,000.
  • the winding 4 is produced with a conducting wire insulated and comprising a coating of thermo-adhesive resin, such as for example an enamelled copper wire Thermibond R type.
  • This wire is wound in the form of a coil of rectangular shape, as seen in figure 5, by winding the wire on a dimension mandrel adapted. Keeping the turns in shape and connecting turns between them to obtain resistance mechanical of the coil is ensured by thermo-adhesion, by passing an electric current through the wire calibrated to raise its temperature by effect Joule at a temperature of around 180 ° C, so that ensuring the fusion of the coating and the connection of the turns after cooling. The coil can then be removed from the mandrel without deformation.
  • This type of winding without the use of a support frame allows minimize the size of the coil and ensure better heat dissipation in progress use.
  • the coil 4 is then mounted on a grid 21 of conductive metal, by example in tinned copper alloy.
  • Grid 21 is shaped so as to present elements 22 extending on each side of the spool and intended for form the connection lugs 2 as will be seen by after.
  • the ends 41 of the wire are welded to internal ends 24 of the elements 22 by supplying tin at high temperature, around 300 ° C, with a soldering iron or any equivalent process.
  • the elements 22 located on the same side of the coil can be connected between them.
  • the elements 22 would then be separated, each element 22 capable of receiving one end of a winding.
  • Glue dots 23 also maintain temporary winding on the grid.
  • the body 1 is then molded onto the assembly thus obtained, so as to drown the winding and the coil fittings on the grid in the resin, as shown in Figures 6 to 8, and to obtain the body 1 having two lateral parts 11, located symmetrically with respect to the median plane P and from where the elements 22 of the grid emerge, and two parts transverse 12 providing a central opening 13 which crosses the body in the direction of the axis of the coil.
  • the two elements 31 of the core are then placed on either side of the body, as shown in Figure 11, the extreme branches 32 of E passing outside of body 12 transverse parts, and branches control panels 33 passing through the opening 13. Maintaining the 31 elements of ferrite is provided by glue joints 34, 35 arranged respectively between the faces of the branches of the E and on the sides between the ferrite elements and the body, as shown in figures 10 and 11.
  • the grid elements 22 are also cut and shaped by folding to form the legs of connection 2, which extend substantially in the plane of the underside 18 of the inductor.
  • FIG. 2 illustrates a variant of realization usable in the case of an inductor comprising a single winding. Legs 2 located on a same side are then replaced by a 2 'bar which extends in the corner of the component, over the entire length of it.
  • FIG. 3 illustrates yet another variant, in which the 2 '' connection pads are fitted only on the edges of the lateral parts it of the body, such a component being able in particular to be mounted perpendicular to the circuit surface printed.
  • the winding may include several elements, separated or connected together, to make various types of transformers or inductors.
  • the core can be formed of a single E-shaped part having more branches long and the other part being flat.

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

Claims (9)

  1. Induktives Bauelement zum Montieren auf eine gedruckte Schaltung, weiches wenigstens eine Spule (4) umfasst, die aus einem elektrisch leitenden Draht besteht, der in Form einer Flachspule aufgewickelt ist, einen Körper aus isolierendem Material, der eine Unterseite aufweist, die im wesentlichen rechtwinklig zur Achse der Spule (4) ist und eine mittige Öffnung (13) umfasst, die diesen entlang der Achse der Spule durchquert, und einen magnetischen Kern (3) aus Ferrit,
    dadurch gekennzeichnet, dass:
    die Enden (41) der Spule (4) verbunden sind mit inneren Enden (24) der Verbindungskontakte (2),
    der Körper (1) gebildet ist aus einem Block aus isolierendem Material, welches auf die Spule und auf die inneren Enden der Kontakte ausgegossen wird,
    der Kern (3) den Körper in einer Mittelebene (P) umschließt, die die Achse der Spule enthält, und ein mittiges Element (33) aufweist, welches durch die Öffnung des Körpers durchgeht.
  2. Induktives Bauelement gemäß Anspruch 1, dadurch gekennzeichnet dass die Verbindungskontakte (2) aus dem Körper (1) auf Ebene der Unterseite (18) herausstehen, auf zwei in Bezug auf die Mittelebene gegenüber liegenden Seiten des Körpers.
  3. Induktives Bauelement gemäß Anspruch 1, dadurch gekennzeichnet dass der Kern (3) gebildet ist aus zwei Elementen (31), die sich jeweils über jede der Seiten des Körpers erstrecken, wobei wenigstens eins der Elemente eine Form eines E aufweist, dessen mittlerer Zweig (33) durch die Öffnung des Körpers durchgeht und dessen äußere Zweige (32) auf zwei dem Körper gegenüber liegenden Seiten durchgehen.
  4. Induktives Bauelement gemäß Anspruch 3, dadurch gekennzeichnet dass ein magnetischer Luftspalt zwischen den zwei Elementen, die den Kern bilden, angeordnet ist.
  5. Induktives Bauelement gemäß Anspruch 3, dadurch gekennzeichnet dass die zwei Elemente (31) des Kerns durch Kleben verbunden sind.
  6. Verfahren zur Herstellung eines induktiven Bauelements zum Montieren auf eine gedruckte Schaltung, welches wenigstens eine Spule (4) und einen magnetischen Kern (3) umfasst,
    dadurch gekennzeichnet, dass:
    die Spule in Form einer Flachspule (4) realisiert ist durch Aufwickeln eines Drahtes ohne Verwendung eines Gestells,
    die Spule (4) auf einem Gitter (21) platziert ist, wobei die Achse der Spule senkrecht zu dem Gitter ist, und die Enden des Drahtes auf das Gitter gelötet werden,
    über die so erhaltene Einheit ein Körper (1) aus isolierendem Material aufgegossen wird, wobei eine mittige Öffnung (13) in der Achse der Spule gelassen wird und die Ränder des Gitters auf zwei gegenüber liegenden Seiten des Körpers sichtbar gelassen werden,
    auf beiden Seiten des Körpers zwei Elemente des Kerns (31) aus Ferrit platziert werden, von denen wenigstens eins eine Form eines E aufweist, wobei der mittlere Zweig (33) des E in die mittige Öffnung des Körpers eingesetzt wird und die zwei anderen Zweige auf zwei gegenüber liegenden Seiten des Körpers durchgehen, und die zwei Elemente des Kerns aneinander befestigt werden.
  7. Verfahren gemäß Anspruch 6, dadurch gekennzeichnet, dass die Spule (4) aus einem Draht hergestellt ist, der eine äußere thermo-adhärente Schicht umfasst und, nach dem Aufwickeln, durch den Draht ein elektrischer Strom durchgeschickt wird mit ausreichender Intensität, um diesen zu erhitzen und eine Haftung der Windungen untereinander zu erhalten.
  8. Verfahren gemäß Anspruch 6, dadurch gekennzeichnet, dass die Spule (4) auf das Gitter (21) geklebt ist.
  9. Verfahren gemäß Anspruch 6, dadurch gekennzeichnet, dass die zwei Elemente (31) des Kerns durch Kleben mit einem nichtmagnetischen Klebstoff zusammengefügt werden.
EP97943031A 1997-10-01 1997-10-01 Induktives bauelement und verfahren zur herstellung eines solchen bauelements Expired - Lifetime EP1019926B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FR1997/001727 WO1999017318A1 (fr) 1997-10-01 1997-10-01 Composant inductif et procede de fabrication d'un tel composant

Publications (2)

Publication Number Publication Date
EP1019926A1 EP1019926A1 (de) 2000-07-19
EP1019926B1 true EP1019926B1 (de) 2004-05-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97943031A Expired - Lifetime EP1019926B1 (de) 1997-10-01 1997-10-01 Induktives bauelement und verfahren zur herstellung eines solchen bauelements

Country Status (4)

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US (1) US6486763B1 (de)
EP (1) EP1019926B1 (de)
DE (1) DE69729127T2 (de)
WO (1) WO1999017318A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030184423A1 (en) 2002-03-27 2003-10-02 Holdahl Jimmy D. Low profile high current multiple gap inductor assembly
US7002074B2 (en) 2002-03-27 2006-02-21 Tyco Electronics Corporation Self-leaded surface mount component holder
US6960976B2 (en) * 2002-05-21 2005-11-01 Yun-Kuang Fan Ferrite cored coil structure for SMD and fabrication method of the same
US7598837B2 (en) 2003-07-08 2009-10-06 Pulse Engineering, Inc. Form-less electronic device and methods of manufacturing
JP4436794B2 (ja) * 2004-11-16 2010-03-24 スミダコーポレーション株式会社 プレート部材、このプレート部材を用いた磁性素子および磁性素子の製造方法
TWI272623B (en) * 2005-12-29 2007-02-01 Ind Tech Res Inst Power inductor with heat dissipating structure
DE102012201847A1 (de) * 2012-02-08 2013-08-08 Würth Elektronik eiSos Gmbh & Co. KG Elektronisches Bauelement
CN206585400U (zh) * 2016-07-25 2017-10-24 台达电子工业股份有限公司 微型风扇
US10989205B2 (en) 2016-07-25 2021-04-27 Delta Electronics, Inc. Micro fan

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553123A (en) * 1982-09-03 1985-11-12 Murata Manufacturing Co., Ltd. Miniature inductor
JP3064492B2 (ja) * 1991-05-15 2000-07-12 株式会社トーキン 表面実装型線輪部品の製造方法
JPH05217761A (ja) * 1992-01-31 1993-08-27 Sony Corp ギャップ付き磁芯及びインダクタンス素子
JP2859484B2 (ja) * 1992-03-25 1999-02-17 田中貴金属工業株式会社 酸化物分散強化白金と白金との複合材料の製造方法
GB2296387B (en) * 1994-12-02 1999-10-13 Dale Electronics Low profile inductor/transformer component
EP0741396A1 (de) * 1995-05-04 1996-11-06 AT&T IPM Corp. Magnetische Leistungsvorrichtung mit drahtlose Leiterplattenanschluss und ihr Herstellungsverfahren
CA2180992C (en) * 1995-07-18 1999-05-18 Timothy M. Shafer High current, low profile inductor and method for making same

Also Published As

Publication number Publication date
US6486763B1 (en) 2002-11-26
DE69729127D1 (de) 2004-06-17
DE69729127T2 (de) 2004-10-28
WO1999017318A1 (fr) 1999-04-08
EP1019926A1 (de) 2000-07-19

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