EP1019926B1 - Composant inductif et procede de fabrication d'un tel composant - Google Patents
Composant inductif et procede de fabrication d'un tel composant Download PDFInfo
- 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
Links
- 230000001939 inductive effect Effects 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 7
- 238000004804 winding Methods 0.000 claims description 37
- 229910000859 α-Fe Inorganic materials 0.000 claims description 16
- 239000011810 insulating material Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 238000004026 adhesive bonding Methods 0.000 claims 1
- 208000031968 Cadaver Diseases 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000003292 glue Substances 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000005476 soldering Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
Description
caractérisé en ce que :
- les extrémités du bobinage sont reliées à des extrémités internes de plots de connexion ,
- le corps est formé d'un bloc de matière isolante surmoulé sur la bobine et sur les dites extrémités internes des plots,
- le noyau entoure le corps dans un plan médian contenant l'axe de la bobine et présente un élément central passant dans l'ouverture du corps.
- on réalise le bobinage sous forme d'une bobine plate par enroulement d'un fil sans utiliser de carcasse,
- on place le bobinage sur une grille, l'axe du bobinage étant perpendiculaire à la grille, et on soude les extrémités du fil sur la dite grille,
- on surmoule sur l'ensemble ainsi obtenu un corps en matière isolante, de manière à laisser une ouverture centrale dans l'axe de la bobine et à laisser apparent les bords de la grille sur deux cotés opposés du corps,
- on place de part et d'autre du corps deux éléments de noyau en ferrite, dont l'un au moins a une forme en E, la branche centrale du E étant insérée dans la dite ouverture centrale du corps et les deux autres branches passant sur deux côtés opposés du corps, et on fixe les deux éléments de noyau l'un sur l'autre.
- la figure 1 est une vue en perspective d'une inductance conforme à l'invention,
- les figures 2 et 3 illustrent deux autres variantes de réalisation,
- les figure 4 et 5 illustrent, respectivement en vue frontale et de dessus, le montage du bobinage sur une grille destinée à former par la suite les pattes de connexion,
- la figure 6 est une vue de dessus du composant après moulage du corps,
- la figure 7 est une vue latérale du corps,
- la figure 8 est une vue en coupe selon la ligne VIII-VIII de la figure 6,
- la figure 9 montrent le composant après mise en place d'un des deux éléments du noyau,
- la figure 10 montre en vue de côté le composant terminé,
- la figure 11 est une vue en coupe du composant selon la ligne XI-XI de la figure 9, avec le noyau complet.
Claims (9)
- Composant inductif destiné à être monté sur un circuit imprimé, comportant au moins un bobinage (4) constitué d'un fil électriquement conducteur enroulé sous forme d'une bobine plate, un corps en matière isolante présentant une face inférieure sensiblement orthogonale à l'axe de la bobine (4) et comportant une ouverture centrale (13) qui le traverse selon l'axe de la bobine, et un noyau magnétique (3) en ferrite,
caractérisé en ce que :les extrémités (41) du bobinage (4) sont reliées à des extrémités internes (24) de plots de connexion (2),le corps (1) est formé d'un bloc de matière isolante surmoulé sur la bobine et sur les dites extrémités internes des plots,le noyau (3) entoure le corps dans un plan médian (P) contenant l'axe de la bobine et présente un élément central (33) passant dans l'ouverture du corps. - Composant inductif selon la revendication 1, caractérisé en ce que des plots de connexion (2) émergent du corps (1) au niveau de la face inférieure (18), sur deux cotés du corps opposés par rapport au dit plan médian.
- Composant inductif selon la revendication 1, caractérisé en ce que le noyau (3) est formé de deux éléments (31) s'étendant respectivement sur chacune des faces du corps, l'un au moins des dits éléments ayant une forme en E dont la branche centrale (33) passe dans l'ouverture du corps et les branches ,extrêmes (32) passent sur deux cotés opposés du dit corps.
- Composant inductif selon la revendication 3, caractérisé en ce que un entrefer magnétique est ménagé entre les deux éléments constituant le noyau.
- Composant inductif selon la revendication 3, caractérisé en ce que les deux éléments (31) du noyau sont assemblés par collage.
- Procédé de fabrication d'un composant inductif destiné à être monté sur un circuit imprimé et comportant au moins un bobinage (4) et un noyau magnétique (3), caractérisé en ce que :on réalise le bobinage sous forme d'une bobine plate (4) par enroulement d'un fil sans utiliser de carcasse,on place le bobinage (4) sur une grille (21), l'axe du bobinage étant perpendiculaire à la grille, et on soude les extrémités du fil sur la dite grille,on surmoule sur l'ensemble ainsi obtenu un corps (1) en matière isolante, de manière à laisser une ouverture centrale (13) dans l'axe de la bobine et à laisser apparent les bords de la grille sur deux cotés opposés du corps,on place de part et d'autre du corps deux éléments de noyau (31) en ferrite, dont l'un au moins a une forme en E, la branche centrale (33) du E étant insérée dans la dite ouverture centrale du corps et les deux autres branches passant sur deux côtés opposés du corps, et on fixe les deux éléments de noyau l'un sur l'autre.
- Procédé selon la revendication 6, caractérisé en ce que le bobinage (4) est réalisé avec un fil comportant une couche externe thermo-adhérente, et, après bobinage, on fait passer dans le fil un courant électrique d'intensité suffisante pour l'échauffer ,et obtenir l'adhérence des spires entre elles.
- Procédé selon la revendication 6, caractérisé en ce que la bobine (4) est collée sur la grille (21).
- Procédé selon la revendication 6, caractérisé en ce que les deux éléments (31) du noyau sont assemblés l'un sur l'autre par collage avec un adhésif amagnétique.
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 (fr) | 2000-07-19 |
EP1019926B1 true EP1019926B1 (fr) | 2004-05-12 |
Family
ID=9503711
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97943031A Expired - Lifetime EP1019926B1 (fr) | 1997-10-01 | 1997-10-01 | Composant inductif et procede de fabrication d'un tel composant |
Country Status (4)
Country | Link |
---|---|
US (1) | US6486763B1 (fr) |
EP (1) | EP1019926B1 (fr) |
DE (1) | DE69729127T2 (fr) |
WO (1) | WO1999017318A1 (fr) |
Families Citing this family (9)
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 |
CN206585399U (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)
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 (fr) | 1995-05-04 | 1996-11-06 | AT&T IPM Corp. | Dispositif à puissance magnétique utilisant une connexion sans fils à une carte de circuit imprimé et sa méthode de fabrication |
CA2180992C (fr) | 1995-07-18 | 1999-05-18 | Timothy M. Shafer | Bobine d'induction a courant eleve et methode de fabrication |
-
1997
- 1997-10-01 WO PCT/FR1997/001727 patent/WO1999017318A1/fr active IP Right Grant
- 1997-10-01 US US09/509,747 patent/US6486763B1/en not_active Expired - Lifetime
- 1997-10-01 EP EP97943031A patent/EP1019926B1/fr not_active Expired - Lifetime
- 1997-10-01 DE DE69729127T patent/DE69729127T2/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE69729127T2 (de) | 2004-10-28 |
EP1019926A1 (fr) | 2000-07-19 |
DE69729127D1 (de) | 2004-06-17 |
US6486763B1 (en) | 2002-11-26 |
WO1999017318A1 (fr) | 1999-04-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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