WO1996021935A1 - 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
WO1996021935A1
WO1996021935A1 PCT/EP1995/003924 EP9503924W WO9621935A1 WO 1996021935 A1 WO1996021935 A1 WO 1996021935A1 EP 9503924 W EP9503924 W EP 9503924W WO 9621935 A1 WO9621935 A1 WO 9621935A1
Authority
WO
WIPO (PCT)
Prior art keywords
plastic
plastic film
carrier plates
planar transformer
windings
Prior art date
Application number
PCT/EP1995/003924
Other languages
German (de)
English (en)
Inventor
Michael Bothe
Reinhold Schulz
Holger Schorr
Original Assignee
Friemann & Wolf Gerätebau 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 Friemann & Wolf Gerätebau Gmbh filed Critical Friemann & Wolf Gerätebau Gmbh
Priority to EP95934132A priority Critical patent/EP0750785B1/fr
Priority to DE59502173T priority patent/DE59502173D1/de
Publication of WO1996021935A1 publication Critical patent/WO1996021935A1/fr

Links

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 switched-mode power supplies for generating extra-low voltages, consisting of two or more plastic support plates provided with spirally printed primary or secondary windings, which are sandwiched with an electrically insulating layer and are provided with a magnetic core with a middle leg protrudes through a central opening of the carrier plates, each carrier plate having a printed winding on both surfaces, the winding ends of which are electrically connected in series by means of a plated-through hole. Furthermore, the invention is concerned with methods for the production of such a carrier plate for the production of a planar transformer.
  • a planar transformer corresponding to the preamble of claim 1 can be found in electronics practice no. Nov. 21-3, 1994, pp. 61-62.
  • Planar transformers of this type are generally equipped with approximately 0.25 mm thick carrier plates made of plastic, a perforation and a mostly sleeve-shaped contact element formed by electroplating being arranged in the carrier plate for through-contacting the winding ends. Similar sleeve-shaped contact elements are also used for through-plating two or more carrier plates connected in series.
  • the printed windings must have a certain minimum distance to ensure adequate protection against breakdown.
  • the carrier plate lies at a minimum distance from the edge of the carrier plate which must at least correspond to the hole diameter.
  • these measures disadvantageously cause enlarged dimensions of the planar transformer.
  • the through-contacting is also very complex.
  • the known planar transformers are only suitable for power above about 60 W because of the necessary electrical isolation between the primary and secondary circuits and due to the necessary air and creepage distances of the windings to the magnetic core.
  • an induction coil is also known, in which windings are printed on both sides of a band-shaped plastic film, two opposite spirals having their inner ends in contact with one another through a small opening in the insulating material.
  • the tape is folded in a zigzag pattern, the spirals being covered by a layer of lacquer for insulation or insulating plates being inserted between them.
  • a isolating transformer is described, on each of the surfaces provided with a conductor track layer, a winding is applied according to the sealing layer technique; the entire winding arrangement is covered with a highly insulating synthetic resin coating.
  • the object of the invention is to improve the potential separation between the primary and secondary circuits, to make the planar transformer accessible even for powers below 60 W and to simplify its manufacture.
  • the use of a particularly thin plastic film as the carrier plate initially has the advantage of a substantially smaller thickness, which results in a substantial reduction in the Dimensions of the planar transformer is reached. Furthermore, the extremely small thickness of the plastic film allows a much easier through-contacting by mechanical means.
  • the two bare winding ends are pressed together in the area of a cutout in connection with a plastic extrusion coating in order to achieve the desired series connection of the two windings.
  • the cutout and the plated-through hole can be placed much closer to the edge.
  • the extrusion coating finally creates insulation which is an integral part of the carrier plate or plastic film provided with the windings, so that no special insulating foils need to be interposed when the carrier plates are stacked. This also improves the dielectric strength and electrical isolation so that the planar transformer, depending on the switching frequency, is also suitable for smaller powers of approximately 10 W and below.
  • the carrier plate built into the planar transformer can be produced in a particularly simple manner by printing the spiral-shaped windings onto the two surfaces of an approximately 10 to 100 ⁇ m thick film made of plastic, the winding ends being bare over a cutout in the plastic film lie and the plastic film provided with the windings is overmolded under high pressure with an electrically insulating thermoplastic material such that the two winding ends are pressed firmly against one another in the region of the cutout.
  • the plastic mass is expediently encapsulated at a pressure greater than 50,000 hPa and applied in such an amount that the coating is less than 0.2 mm thick.
  • a method which is particularly suitable for producing a planar transformer provides that the plastic films overmolded with the electrically insulating plastic compound are stacked, fitted with the magnetic core and the components of the Unit can be mechanically fixed by extrusion coating with another electrically insulating thermoplastic material.
  • FIG. 2 shows the object of FIG. 1 in a schematic exploded view
  • FIG. 3 shows a partial cross section through a carrier plate in the area of the plated-through hole in a schematic representation
  • FIG. 4 shows a partial cross section through a planar transformer with three carrier plates in a schematic representation
  • the planar transformer 1 shown in FIG. 1 is essentially composed of three carrier plates 2 consisting of thin plastic films, each of which is provided on its two surfaces with a spirally printed conductor track-like winding 3 and with connecting lugs 4 and the like Training is described in more detail below.
  • 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, which serves for through-contacting the winding ends 3c, 3d.
  • the carrier plates 2 are coated with an insulating plastic compound 11. The windings 3 of the three carrier plates 2 are switched so that they form the primary or secondary windings of 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 between approximately 10 and 100 ⁇ m depending on the intended performance.
  • the plastic film 12 is printed on its two surfaces with a spiral, conductor track-like winding 3 made of copper or the like.
  • the thickness of the copper coating varies between a few micrometers and 200 ⁇ m, preferably between 20 and 200 ⁇ m.
  • FIG. 3 shows the upper winding 3a and the lower winding 3b, the winding ends 3c and 3d of which are arranged bare above the cutout 10 in the plastic film 12 and are pressed against one another by means of an overmolded plastic compound 11, so that the upper and lower windings 3a, 3b are connected in series.
  • An electrically insulating thermoplastic is suitable as the plastic compound 11.
  • the thickness of the extruded plastic compound 10 should be less than 0.2 mm.
  • the injection molding of the plastic mass 11 takes place under such a high pressure that the winding ends 3c, 3d are pressed firmly against one another in the cutout.
  • the injection molding can take place at 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.
  • two or more carrier plates 2 are stacked and assigned to a planar transformer 1 as primary or secondary windings.
  • the arrangement of three carrier plates 2 is illustrated in FIG. 4.
  • Thieves- Layering of plastic mass 11 isolates the carrier plates 2 from one another and brings about potential isolation.
  • the stacked three carrier plates 2 are provided with the magnetic core 5.
  • the assembled structural unit can be extrusion-coated with an insulating thermoplastic material.
  • planar transformers 1 shows the production of planar transformers 1 in connection with a film-like plastic film 12, which is transported through a plurality of processing stations I to VIII by means of an edge perforation 13a.
  • the plastic film 12 is provided with openings 9 and cutouts 14 for the passage of 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.
  • the stations II and III are used to print the plastic film 12 with the two windings 3a, 3b.
  • the plastic film 12 with the printed windings 3a, 3b is overmolded with the plastic mass 11 on station IV, the winding ends 3c, 3d being pressed against one another in a current-conducting manner.
  • Station V includes stacking two or more carrier plates 2.
  • the magnetic cores 5 are installed in station VI and in station VII the assembly unit is extrusion-coated with an insulating plastic compound 15.
  • the planar transformers 1 are isolated at station VIII. This method advantageously allows fully automatic production, which can also
  • planar transformers 1 with two, four or more carrier plates 2 can of course also be produced.

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)

Abstract

L'invention concerne un transformateur planaire (1) pour alimentation à découpage, servant à produire de faibles tensions. Ledit transformateur comprend au moins deux plaques de support (2) en plastique sur lesquelles ont été imprimés des enroulements primaires ou secondaires hélicoïdaux. Ces plaques forment une structure sandwich avec une couche isolante intercalée et sont pourvues d'un noyau magnétique dont le montant central dépasse à travers une ouverture centrale des plaques de support. Chaque plaque de support (2) présente, sur ses deux faces, un enroulement imprimé (3a, 3b), ces enroulements étant montés électriquement en série par métallisation. Afin d'améliorer la séparation de potentiel, pour adapter ces enroulements à de faibles puissances et faciliter leur fabrication, on imprime ces enroulements (3a, 3b) sur une feuille de plastique (12) de 10 à 100 νm d'épaisseur. Deux extrémités d'enroulement (3c, 3d) sont dénudées sur une encoche (10) dans la feuille de plastique (12). La feuille de plastique (12) est recouverte d'une matière thermoplastique (11) par pulvérisation, qui presse fermement les deux extrémités d'enroulement (3c, 3d) l'une contre l'autre au niveau de l'encoche (10). Lors de la fabrication des plaques de support (2), on dénude les extrémités d'enroulement (3c, 3d) sur l'encoche (10) dans la feuille de plastique (12), et on recouvre la feuille de plastique (12), comportant les enroulements (3a, 3b), avec une matière thermoplastique isolante (10) pulvérisée à haute pression. Pour monter un transformateur planaire (1), on empile au moins deux plaques de support (2) recouvertes d'une matière plastique (11) pulvérisée, on équipe les plaques avec le noyau magnétique, et on fixe les composants du module en injectant la matière thermoplastique isolante.
PCT/EP1995/003924 1995-01-14 1995-10-04 Transformateur planaire pour alimentation a decoupage, servant a produire de faibles tensions, et procede de fabrication dudit transformateur WO1996021935A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95934132A 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
DE59502173T DE59502173D1 (de) 1995-01-14 1995-10-04 Planartransformator für schaltnetzteile zur erzeugung von kleinspannungen und verfahren zu dessen herstellung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19500943.6 1995-01-14
DE19500943A DE19500943C1 (de) 1995-01-14 1995-01-14 Planartransformator für Schaltnetzteile zur Erzeugung von Kleinspannungen und Verfahren zu dessen Herstellung

Publications (1)

Publication Number Publication Date
WO1996021935A1 true WO1996021935A1 (fr) 1996-07-18

Family

ID=7751480

Family Applications (1)

Application Number Title Priority Date Filing Date
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

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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225602A1 (fr) * 2001-01-23 2002-07-24 Abb Research Ltd. Enroulement de transformateur
DE102011003754A1 (de) * 2011-02-08 2012-08-09 Bolzenschweißtechnik Heinz Soyer GmbH Transformator und Wicklungselement zum Bilden eines Wicklungspakets hierfür

Families Citing this family (7)

* 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
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
DE102010062240A1 (de) 2010-12-01 2012-06-06 Robert Bosch Gmbh Multiphasenwandler
DE102010062242A1 (de) 2010-12-01 2012-06-06 Robert Bosch Gmbh Multiphasenwandler
KR102317743B1 (ko) * 2015-07-21 2021-10-27 삼성전자 주식회사 전자기 유도 소자, 이를 구비한 전원공급장치 및 디스플레이장치
KR102209038B1 (ko) * 2019-10-04 2021-01-28 엘지이노텍 주식회사 자기 결합 장치 및 이를 포함하는 평판 디스플레이 장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3418379A1 (de) * 1983-05-18 1984-11-22 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto Schichtfoermig aufgebaute induktionsspule
JPS60258911A (ja) 1984-06-05 1985-12-20 Fuji Xerox Co Ltd トランスの巻線形成方法
GB2260222A (en) * 1991-10-03 1993-04-07 Murata Manufacturing Co Flat coils

Family Cites Families (2)

* Cited by examiner, † Cited by third party
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE3418379A1 (de) * 1983-05-18 1984-11-22 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto Schichtfoermig aufgebaute induktionsspule
JPS60258911A (ja) 1984-06-05 1985-12-20 Fuji Xerox Co Ltd トランスの巻線形成方法
GB2260222A (en) * 1991-10-03 1993-04-07 Murata Manufacturing Co Flat coils

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 285 (E - 287) 26 December 1984 (1984-12-26) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1225602A1 (fr) * 2001-01-23 2002-07-24 Abb Research Ltd. Enroulement de transformateur
WO2002059919A1 (fr) * 2001-01-23 2002-08-01 Abb Research Ltd Enroulement de transformateur
DE102011003754A1 (de) * 2011-02-08 2012-08-09 Bolzenschweißtechnik Heinz Soyer GmbH Transformator und Wicklungselement zum Bilden eines Wicklungspakets hierfür

Also Published As

Publication number Publication date
ES2117449T3 (es) 1998-08-01
EP0750785B1 (fr) 1998-05-13
DK0750785T3 (da) 1998-06-02
DE59502173D1 (de) 1998-06-18
DE19500943C1 (de) 1996-05-23
ATE166178T1 (de) 1998-05-15
EP0750785A1 (fr) 1997-01-02

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