EP0750785B1 - Transformateur planaire pour alimentation a decoupage, servant a produire de faibles tensions, et procede de fabrication dudit transformateur - Google Patents

Transformateur planaire pour alimentation a decoupage, servant a produire de faibles tensions, et procede de fabrication dudit transformateur Download PDF

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Publication number
EP0750785B1
EP0750785B1 EP95934132A EP95934132A EP0750785B1 EP 0750785 B1 EP0750785 B1 EP 0750785B1 EP 95934132 A EP95934132 A EP 95934132A EP 95934132 A EP95934132 A EP 95934132A EP 0750785 B1 EP0750785 B1 EP 0750785B1
Authority
EP
European Patent Office
Prior art keywords
plastic
windings
planar transformer
plastic film
coils
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
EP95934132A
Other languages
German (de)
English (en)
Other versions
EP0750785A1 (fr
Inventor
Michael Bothe
Reinhold Schulz
Holger Schorr
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.)
Friwo Geraetebau GmbH
Original Assignee
Friwo Geraetebau GmbH
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 Friwo Geraetebau GmbH filed Critical Friwo Geraetebau GmbH
Publication of EP0750785A1 publication Critical patent/EP0750785A1/fr
Application granted granted Critical
Publication of EP0750785B1 publication Critical patent/EP0750785B1/fr
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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2804—Printed windings
    • 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
    • H01F27/2804—Printed windings
    • H01F2027/2809—Printed windings on stacked layers
    • 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
    • H01F27/2804—Printed windings
    • H01F2027/2819—Planar transformers with printed windings, e.g. surrounded by two cores and to be mounted on printed circuit

Definitions

  • the invention relates to a planar transformer for Switching power supplies for generating low voltages, consisting of two or more, with spirally printed Carrier plates provided with primary or secondary windings made of plastic, the interposition of an electrical insulating layer sandwiched and with a Magnetic core are provided with a middle leg protrudes through a central opening of the carrier plates, wherein each carrier plate has a printed one on both surfaces Has winding, the winding ends by means of a Vias are electrically connected in series. Furthermore, the invention is concerned with methods of manufacture such a carrier plate for the manufacture of a Planar transformers.
  • a planar transformer corresponding to the preamble of claim 1 is from Patent Abstracts of Japan: Vol.10, N ° 129 (E-403) & JP-A-60258911 known.
  • Planar transformers this type are usually with about 0.25 mm thick carrier plates made of plastic, whereby for through-plating a perforation of the winding ends in the carrier plate and in it a mostly sleeve-shaped, by electroplating formed contact element is arranged.
  • Similar sleeve-shaped Contact elements are also used for through-plating of two or more carrier plates connected in series used. To ensure adequate protection against breakdowns the printed windings a certain minimum distance to have.
  • the perforation for the via the because of the spiral guidance of the windings on the edge of The carrier plate lies at a minimum distance for reasons of strength be arranged from the edge of the support plate, the must at least correspond to the hole diameter.
  • These measures disadvantageously cause enlarged ones Dimensions of the planar transformer.
  • the via is also through very complex.
  • Another disadvantage is also in that the known planar transformers because of the necessary electrical isolation between the primary and secondary circuits as well as due to the necessary air and Creepage distances of the windings to the magnetic core only for services over 60 W are suitable.
  • an induction coil is also known in the case of a band-shaped plastic film on both sides Turns are printed, two opposite Spirals with their inner ends through a small one Opening in the insulating material should be in contact with each other.
  • the ribbon is folded zigzag, using the spirals for insulation covered by a layer of lacquer or between them Insulating plates are inserted.
  • DD-PS 205 578 describes a isolating transformer, on the one with Conductor layer provided surfaces one winding each the sealing layer technique is applied; the entire winding arrangement is with a highly insulating synthetic resin coating overdrawn.
  • the invention is based on the object Electrical isolation between the primary and secondary circuits to improve the planar transformer for To make power below 60 W accessible and its production to simplify.
  • the task is performed by the in the characterizing part of claim 1 specified features solved.
  • the use of a particularly thin plastic film as The carrier plate initially has the advantage of being significantly smaller Thickness, causing a substantial reduction in Dimensions of the planar transformer is reached. Farther allows the extremely small thickness of the plastic film a much easier via on mechanical Ways.
  • the two bare winding ends are in Connection with a plastic encapsulation in the area of a Cutout pressed tightly together to achieve the desired To achieve series connection of the two windings.
  • the cutout and the via can be essential be placed closer to the edge. Due to the extrusion coating finally created insulation that is more integrated Part of the carrier plate provided with the windings or plastic film, so that when stacking the carrier plates no special insulating foils interposed need to be. This also increases the dielectric strength and electrical isolation improved so that the planar transformer depending on the switching frequency also suitable for smaller powers of around 10 W and below is.
  • the carrier plate built into the planar transformer leaves produce themselves in a particularly simple manner in that the spiral windings on the two faces of one about 10 to 100 microns thick film printed from the plastic be, with the winding ends bare above a Cutout in the plastic film and come to rest plastic film provided with the windings under high Printing with an electrically insulating thermoplastic Plastic compound is overmolded such that the two Winding ends firmly against each other in the area of the cutout be pressed.
  • the plastic mass is useful with molded at a pressure greater than 50,000 hPa and in one applied such an amount that the coating is less than Is 0.2 mm thick.
  • a special one for the production of a planar transformer Suitable method provides that the electrically insulating plastic compound overmolded plastic films stacked, equipped with the magnetic core and the components of the Unit by overmolding with another electrically insulating thermoplastic plastic mass mechanically be fixed.
  • the planar transformer 1 shown in Fig. 1 is essentially of three, consisting of thin plastic films Carrier plates 2 assembled, each on their two Surfaces with a spiral-like printed conductor track Winding 3 and provided with lugs 4 are and their training described in more detail below is.
  • a two-part magnetic core 5 is provided which is designed as a jacket core.
  • the upper part of the magnetic core 5 has, as shown in FIG. 2, two side legs 6, a middle leg 7 and a lower yoke 8.
  • the carrier plates 2 are provided with a central opening 9, through which the middle leg 7 of the magnetic core 5 protrudes.
  • a cutout 10 is provided for the through-plating the winding ends 3c, 3d serves.
  • the carrier plates 2 with an insulating plastic compound 11.
  • the windings 3 of the three carrier plates 2 are switched so that they have the primary or secondary windings form the planar transformer 1.
  • the carrier plates 2 consisting of a very thin flexible Plastic film 12 made of a temperature-resistant Plastic such as polyamide or the like.
  • the film thickness is in Depending on the intended power between about 10 and 100 ⁇ m.
  • the plastic film 12 is on both surfaces with a spiral, conductor track-like winding 3 printed from copper or the like.
  • the thickness of the copper coating varies between a few micrometers depending on the application and 200 microns, preferably between 20 and 200 microns. In Fig.
  • the upper winding is 3a and the lower winding 3b identified, the winding ends 3c and 3d blank Arranged above the cutout 10 in the plastic film 12 and electrically conductive by means of an overmolded plastic compound 11 are pressed against each other, so that the upper and lower Windings 3a, 3b are connected in series.
  • Plastic compound 11 is an electrically insulating thermoplastic suitable.
  • the thickness of the molded plastic mass 10 should be less than 0.2 mm.
  • the encapsulation of the Plastic mass 11 happens under such a high pressure that the winding ends 3c, 3d firmly against each other in the cutout be pressed.
  • the injection molding with a pressure of 50,000 hPa.
  • a carrier plate 2 is formed, which consists of a Plastic film 12 with plated-through windings 3a, 3b and an insulating coating made of plastic compound 11 consists.
  • the carrier plates 2 there are two or more carrier plates 2 stacked and as primary or secondary windings assigned to a planar transformer 1.
  • 4 is the Arrangement of three carrier plates 2 illustrated.
  • the coating the carrier plates are insulated from plastic mass 11 2 from each other and causes the potential separation.
  • the stacked three carrier plates 2 provided with the magnetic core 5.
  • the assembled unit can be insulated thermoplastic compound are overmolded.
  • planar transformers 1 shown in connection with a film-like plastic film 12, that by means of an edge perforation 13a by several Processing stations I to VIII is transported.
  • Station I the plastic film 12 with openings 9 and cutouts 14 for performing the side legs 6 and the middle leg 7 of the magnetic core 5 and with the cutout 10 for through-contacting the winding ends Mistake.
  • Stations II and III are used to print on Plastic film 12 with the two windings 3a, 3b.
  • On station IV is the plastic film 12 with the printed Injection molded 3a, 3b with the plastic mass 11, wherein the winding ends 3c, 3d pressed against each other in a current-carrying manner will.
  • Station V involves stacking two or more carrier plates 2.
  • the magnetic cores 5 are installed the assembly unit is in station VI and in station VII encapsulated with an insulating plastic compound 15.
  • the planar transformers 1 are on of station VIII isolated. This procedure allows in advantageously a fully automated production that is also continuously executable.
  • planar transformers 1 can be produced with two, four or more carrier plates 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Dc-Dc Converters (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Claims (7)

  1. Transformateur planaire pour alimentation à découpage en vue de produire des petites tensions, constitué de deux ou de plusieurs plaquettes de support en matière plastique qui sont munies d'enroulements primaires ou d'enroulements secondaires imprimés en forme de spirale, qui sont disposés en sandwich en intercalant une couche isolante du point de vue électrique et qui sont munies d'un noyau magnétique, dont une branche centrale fait saillie par une ouverture centrale des plaquettes de support, chaque plaquette de support comportant sur les deux faces un enroulement imprimé, dont les extrémités d'enroulement sont connectées en série du point de vue électrique au moyen d'un trou métallisé, caractérisé en ce que les enroulements (3a, 3b) sont imprimés sur une feuille (12) en la matière plastique d'une épaisseur de 10 à 100 µm, en ce que deux des extrémités (3c, 3d) d'enroulement sont disposées en étant dénudées au-dessus d'une découpe (10) ménagée dans la feuille (12) en matière plastique et en ce que la feuille (12) en matière plastique munie des deux enroulements (3a, 3b) est enrobée par moulage par injection d'une composition (11) en matière thermoplastique isolante du point de vue électrique, de telle manière que les deux extrémités (3c, 3d) d'enroulement sont pressées solidement l'une contre l'autre dans la zone de la découpe (10).
  2. Transformateur planaire suivant la revendication 1, caractérisé en ce que les enroulements (3a, 3b) en cuivre ont une épaisseur comprise entre 20 et 200 µm.
  3. Transformateur planaire suivant la revendication 1 ou 2, caractérisé en ce que l'épaisseur de la composition (11) en matière plastique injectée est inférieure à 0,2 mm.
  4. Procédé de fabrication d'une plaquette de support en matière plastique, munie d'un enroulement imprimé en forme de spirale, servant à former un enroulement primaire ou un enroulement secondaire pour des transformateurs planaires en vue de produire de petites tensions, les extrémités d'enroulement étant interconnectées, caractérisé en ce que l'on imprime les enroulements en forme de spirale sur les deux faces d'une feuille (12) en la matière plastique d'une épaisseur de 10 à 100 µm, les extrémités (3c, 3d) d'enroulement venant dénudées au-dessus d'une découpe (10) ménagée dans la feuille (12) en matière plastique et la feuille (12) en matière plastique munie des enroulements (3a, 3b) étant enrobée par moulage par injection à haute pression d'une composition (11) en matière thermoplastique isolante du point de vue électrique de telle manière que les deux extrémités (3c, 3d) d'enroulement sont pressées solidement l'une contre l'autre dans la zone de la découpe (10).
  5. Procédé suivant la revendication 4, caractérisé en ce que l'on injecte la composition (11) de matière plastique à une pression supérieure à 50.000 hPa.
  6. Procédé suivant la revendication 4 ou 5, caractérisé en ce que l'on dépose la composition (11) de matière plastique en une épaisseur inférieure à 0,2 mm.
  7. Procédé de fabrication d'un transformateur planaire pour alimentation à découpage en vue de produire de petites tensions suivant l'une des revendications 1 à 6, caractérisé en ce que l'on empile deux ou plusieurs feuilles (12) en matière plastique enrobées par moulage par injection de la composition (11) en matière plastique isolante du point de vue électrique, en ce qu'on les munie du noyau (5) magnétique et en ce que l'on immobilise mécaniquement les composants de l'unité en l'enrobant par moulage par injection d'une composition (15) supplémentaire en matière thermoplastique isolante du point de vue électrique.
EP95934132A 1995-01-14 1995-10-04 Transformateur planaire pour alimentation a decoupage, servant a produire de faibles tensions, et procede de fabrication dudit transformateur Expired - Lifetime EP0750785B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19500943 1995-01-14
DE19500943A DE19500943C1 (de) 1995-01-14 1995-01-14 Planartransformator für Schaltnetzteile zur Erzeugung von Kleinspannungen und Verfahren zu dessen Herstellung
PCT/EP1995/003924 WO1996021935A1 (fr) 1995-01-14 1995-10-04 Transformateur planaire pour alimentation a decoupage, servant a produire de faibles tensions, et procede de fabrication dudit transformateur

Publications (2)

Publication Number Publication Date
EP0750785A1 EP0750785A1 (fr) 1997-01-02
EP0750785B1 true EP0750785B1 (fr) 1998-05-13

Family

ID=7751480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95934132A Expired - Lifetime EP0750785B1 (fr) 1995-01-14 1995-10-04 Transformateur planaire pour alimentation a decoupage, servant a produire de faibles tensions, et procede de fabrication dudit transformateur

Country Status (6)

Country Link
EP (1) EP0750785B1 (fr)
AT (1) ATE166178T1 (fr)
DE (2) DE19500943C1 (fr)
DK (1) DK0750785T3 (fr)
ES (1) ES2117449T3 (fr)
WO (1) WO1996021935A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106373708A (zh) * 2015-07-21 2017-02-01 三星电子株式会社 电磁感应装置及具有电磁感应装置的供电设备和显示设备

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19835641C2 (de) * 1998-08-06 2000-10-05 Sew Eurodrive Gmbh & Co Leiterplattenanordnung mit planarem induktivem Schaltungselement
EP1225602A1 (fr) * 2001-01-23 2002-07-24 Abb Research Ltd. Enroulement de transformateur
FI120067B (fi) * 2006-10-31 2009-06-15 Jarkko Salomaeki Menetelmä induktiivisen komponentin valmistamiseksi ja induktiivinen komponentti
WO2011021156A1 (fr) * 2009-08-18 2011-02-24 Panacis, Inc. Transformateur planaire multiphase intégré
DE102010062242A1 (de) 2010-12-01 2012-06-06 Robert Bosch Gmbh Multiphasenwandler
DE102010062240A1 (de) 2010-12-01 2012-06-06 Robert Bosch Gmbh Multiphasenwandler
DE102011003754A1 (de) * 2011-02-08 2012-08-09 Bolzenschweißtechnik Heinz Soyer GmbH Transformator und Wicklungselement zum Bilden eines Wicklungspakets hierfür
KR102209038B1 (ko) * 2019-10-04 2021-01-28 엘지이노텍 주식회사 자기 결합 장치 및 이를 포함하는 평판 디스플레이 장치

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60258911A (ja) * 1984-06-05 1985-12-20 Fuji Xerox Co Ltd トランスの巻線形成方法

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE906831C (de) * 1951-12-11 1954-03-18 Rudolf Sliwka Vereinfachte Herstellung von Induktionsspulen, Drosseln und Transformatoren
DD205578A1 (de) * 1982-04-02 1983-12-28 Inst Regelungstechnik Wicklungsanordnung in dickschichttechnik fuer trennuebertrager
JPS59152605A (ja) * 1983-02-18 1984-08-31 Matsushita Electric Ind Co Ltd 積層インダクターの製造方法
JPS59189212U (ja) * 1983-05-18 1984-12-15 株式会社村田製作所 チツプ型インダクタ
JPH05101938A (ja) * 1991-10-03 1993-04-23 Murata Mfg Co Ltd 積層型コイル及びその製造方法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60258911A (ja) * 1984-06-05 1985-12-20 Fuji Xerox Co Ltd トランスの巻線形成方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACS OF JAPAN vol. 10, Nr. 129 (E-304)& JP-A-60258911 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106373708A (zh) * 2015-07-21 2017-02-01 三星电子株式会社 电磁感应装置及具有电磁感应装置的供电设备和显示设备

Also Published As

Publication number Publication date
EP0750785A1 (fr) 1997-01-02
WO1996021935A1 (fr) 1996-07-18
ATE166178T1 (de) 1998-05-15
ES2117449T3 (es) 1998-08-01
DE19500943C1 (de) 1996-05-23
DK0750785T3 (da) 1998-06-02
DE59502173D1 (de) 1998-06-18

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