EP0430802B1 - Schirmanordnung für einen Tramformator eines Schaltnetzteiles - Google Patents

Schirmanordnung für einen Tramformator eines Schaltnetzteiles Download PDF

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Publication number
EP0430802B1
EP0430802B1 EP90403369A EP90403369A EP0430802B1 EP 0430802 B1 EP0430802 B1 EP 0430802B1 EP 90403369 A EP90403369 A EP 90403369A EP 90403369 A EP90403369 A EP 90403369A EP 0430802 B1 EP0430802 B1 EP 0430802B1
Authority
EP
European Patent Office
Prior art keywords
transformer
tray
ferrite core
power supply
core
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
EP90403369A
Other languages
English (en)
French (fr)
Other versions
EP0430802A1 (de
Inventor
Jean-Yves Buatois
Jean-Michel Bouillot
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.)
Thomson Television Components France SA
Original Assignee
Thomson Television Components France 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 Thomson Television Components France SA filed Critical Thomson Television Components France SA
Priority to EP94400705A priority Critical patent/EP0609155B1/de
Publication of EP0430802A1 publication Critical patent/EP0430802A1/de
Application granted granted Critical
Publication of EP0430802B1 publication Critical patent/EP0430802B1/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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/363—Electric or magnetic shields or screens made of electrically conductive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/02—Coils wound on non-magnetic supports, e.g. formers
    • H01F2005/022—Coils wound on non-magnetic supports, e.g. formers wound on formers with several winding chambers separated by flanges, e.g. for high voltage applications

Definitions

  • the present invention relates to a switching power supply transformer with electromagnetic shielding means.
  • Switching power supplies currently equip the vast majority of televisions and monitors for computer installations. Each of these power supplies is provided with a transformer placed on a chassis, which is itself positioned below the cathode ray tube of the television or monitor.
  • a first shielding device currently existing on these transformers, is constituted by a metal cover which completely envelops the transformer, which of course gives an excellent result from the point of view of protection against the abovementioned image pollution.
  • this is a large volume item, expensive in manufacturing cost (if only by the price of the raw material).
  • this very enveloping cover tends to reduce the safety distances between the two primary and secondary circuits of the transformer, because it passes close to certain cable or wire outlets: to comply with the mandatory standards of galvanic isolation, it is then most of the time necessary to insulate the interior of this metal cover by depositing a layer of insulating material.
  • Patent application DE 1069711 from SIEMENS proposes a formwork formed by two metal boxes whose edges are opposite but do not meet. There is thus a saving in material but the problem of space remains unresolved.
  • Another shielding solution consists in providing a magnetic loop, constituted by an annular copper strip which encloses the middle part of the transformer in parallel to the plate on which its output pins are soldered.
  • this shielding ring Being a transformer in "layers" mode, the positioning of this shielding ring is carried out directly by narrow winding and welding of this loop around the "belly” of the transformer (that is to say around of the part which has its winding).
  • Patent EP 0131700 describes a solution avoiding the need for welding.
  • the assembly of the transformer is carried out by means of a metal cage which can be snapped into a single piece which includes the shielding ring.
  • transformers in “layered” mode tend more and more to be replaced by transformers in “pancake” mode, for obvious reasons of ease of automation of their manufacturing mode.
  • a transformer of this type is shown, with general reference 1 in Figure 1 attached.
  • the ferrite core of the transformer is designated by the reference 2, the "pancakes" by 3, the wires they guide and support by 4, and the transformer input / output pins by 5.
  • the invention aims to remedy these drawbacks. To this end, it relates to a switching power supply transformer intended in particular to equip a television set or a monitor, the transformer being equipped with connections, with a ferrite core having a planar face situated opposite the connections and electromagnetic shielding means characterized in that the shielding means consist of a single dish with flat bottom in the shape of a bowl and with flared edges, the flat bottom of this bowl being designed to follow the shape of the flat face of the core of ferrite opposite to the connections and the flared edges being oriented towards the core.
  • This cup can be easily placed, and fixed for example by gluing, on the ferrite core with its flared edges directed downwards in the manner of a cap. These flared edges are chosen to be sufficiently small in width so as not to affect the galvanic isolation provided by the transformer, but nevertheless large enough to allow on the one hand easy place (for example by robot) of this cup on the top of the transformer and on the other hand provide the desired electromagnetic protection.
  • This part is preferably produced by stamping. It is placed on the ferrite core after prior deposit of glue on it (one or two points of glue for example), this glue is advantageously the same as that used to bond the elements of this ferrite core to each other. These bonding and positioning operations are easily carried out by an automatic robotization chain.
  • FIG. 2 represents, in perspective and in scale 1, this shielding device and its mode of installation on a switching power supply transformer.
  • the switching power supply transformer 1 of FIG. 1 is shown there in perspective, with its ferrite core 2, its wafers 3, its connection wires 4, and its input pins / exit 5.
  • the electromagnetic shielding device is constituted by a bowl, or cup, 7 made of copper, produced by stamping.
  • the flat bottom 8 of this cup is rectangular and has the same external dimensions as those of the upper rectangular face 9 of the ferrite core 2.
  • the cup 7 can be made of Al, brass, etc.
  • edges 10 of the cup 7 are flared, with an angular slope ⁇ relative to the axis perpendicular to the plane of the bottom 8 which, being of the order of 15 to 20 degrees for example, is optimized both to allow the easy automatic fitting of the cap 7 on the top of the transformer 1 (as indicated in dashed lines on the drawing) with the edges 10 facing downwards, and to ensure the desired electromagnetic protection.
  • the width L of these edges 10 is chosen to be small (of the order of a few millimeters for example): it must be sufficient to facilitate as much as possible the positioning of the cup 7 on the upper face 9 of the core 2, but not too much important for, while ensuring the electromagnetic protection desired, comply with the galvanic protection standards of the transformer.
  • the simple shape, without cuts or roughness risking to catch pieces to each other, of the shielding cup 7, and its small size allow its easy feeding in a robotic automatic chain, with vibrating bowl, without modification. sensitive manufacturing lines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Insulators (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Electron Sources, Ion Sources (AREA)

Claims (7)

  1. Schaltnetzteiltransformator (1), der insbesondere zur Ausrüstung eines Fernsehers oder eines Monitors bestimmtist, wobei der Transformator mit Verbindungen (5), mit einem Ferritkern (2) mit einer ebenen Fläche (9) gegenüber den Verbindungen (5) und elektromagnetischen Abschirmungsmitteln ausgestattet ist, dadurch gekennzeichnet, daß die Abschirmungsmittel durch eine einzige schalenförmigen Pfanne (7) mit flachem Boden (8) und konisch erweiterten Rändern (10) gebildet werden, wobei der flache Boden (8) dieser Pfanne so ausgelegt ist, daß er an die Form der den Verbindungen (5) gegenüberliegenden ebenen Fläche (9) des Ferritkerns (2) angepaßt ist und die konisch erweiterten Ränder (10) zum Kern (2) hin orientiert sind.
  2. Transformator (1) nach Anspruch 1, dadurch gekennzeichnet, daß die Pfanne (7) durch Stanzen realisiert ist.
  3. Transformator (1) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die konisch erweiterten Ränder (10) der Pfanne eine Größe L von einigen Millimetern aufweisen.
  4. Transformator (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Winkelneigung (α) der konisch erweiterten Ränder (10) der Pfanne (7) zwischen 15 und 20 Grad zum flachen Boden (8) der Pfanne (7) beträgt.
  5. Transformator (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Pfanne (7) durch Ankleben mindestens eines Leims, der derselbe wie der zum Zusammenbau der Bestandteile des Transformatorkerns benutzte ist, am Ferritkern (2) befestigt ist.
  6. Mit einem Transformator (1) nach einem der Ansprüche 1 bis 5 ausgerüsteter Fernseher.
  7. Mit einem Transformator (1) nach einem der Ansprüche 1 bis 5 ausgerüsteter Monitor.
EP90403369A 1989-12-01 1990-11-28 Schirmanordnung für einen Tramformator eines Schaltnetzteiles Expired - Lifetime EP0430802B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP94400705A EP0609155B1 (de) 1989-12-01 1990-11-28 Schirmanordnung für einen Transformator eines Schaltnetzteiles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8915884 1989-12-01
FR8915884A FR2655475B1 (fr) 1989-12-01 1989-12-01 Dispositif de blindage pour transformateur d'alimentation a decoupage.

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP94400705.3 Division-Into 1990-11-28

Publications (2)

Publication Number Publication Date
EP0430802A1 EP0430802A1 (de) 1991-06-05
EP0430802B1 true EP0430802B1 (de) 1996-05-29

Family

ID=9388042

Family Applications (2)

Application Number Title Priority Date Filing Date
EP94400705A Expired - Lifetime EP0609155B1 (de) 1989-12-01 1990-11-28 Schirmanordnung für einen Transformator eines Schaltnetzteiles
EP90403369A Expired - Lifetime EP0430802B1 (de) 1989-12-01 1990-11-28 Schirmanordnung für einen Tramformator eines Schaltnetzteiles

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP94400705A Expired - Lifetime EP0609155B1 (de) 1989-12-01 1990-11-28 Schirmanordnung für einen Transformator eines Schaltnetzteiles

Country Status (5)

Country Link
EP (2) EP0609155B1 (de)
DE (2) DE69029045T2 (de)
ES (2) ES2088424T3 (de)
FR (1) FR2655475B1 (de)
SG (2) SG46710A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3311391B2 (ja) 1991-09-13 2002-08-05 ヴィエルティー コーポレーション 漏洩インダクタンス低減トランス、これを用いた高周波回路及びパワーコンバータ並びにトランスにおける漏洩インダクタンスの低減方法
DE69631462D1 (de) * 1995-11-27 2004-03-11 Vlt Corp Plattierung von permeablen Kernen
FR2756967B1 (fr) * 1996-12-09 1999-01-08 Thomson Television Components Transformateur pour alimentation a haute frequence de decoupage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1069711B (de) * 1959-11-26
CH607264A5 (en) * 1975-05-23 1978-11-30 Landis & Gyr Ag Instrument transformer with earthed screen between windings
DE2931382A1 (de) * 1979-08-02 1981-02-26 Bosch Gmbh Robert Kurzschlussring-geber
DD200830A1 (de) * 1981-09-25 1983-06-15 Martin Dietrich Hochspannungsabschirmelektrode
DE3147984A1 (de) * 1981-12-04 1983-06-16 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Transformator, insbesondere fuer ein schaltnetzteil in einem fernsehempfaenger
IT8334023V0 (it) * 1983-05-09 1983-05-09 Ducati Elettrotecnica Spa Trasformatore smt con nucleo di ferrite.
JPS61137309A (ja) * 1984-12-08 1986-06-25 Nissin Electric Co Ltd ガス絶縁計器用変圧器

Also Published As

Publication number Publication date
DE69029045D1 (de) 1996-12-05
DE69027185T2 (de) 1996-11-07
FR2655475A1 (fr) 1991-06-07
EP0609155B1 (de) 1996-10-30
SG46710A1 (en) 1998-02-20
ES2097613T3 (es) 1997-04-01
ES2088424T3 (es) 1996-08-16
EP0609155A2 (de) 1994-08-03
DE69027185D1 (de) 1996-07-04
EP0430802A1 (de) 1991-06-05
SG46473A1 (en) 1998-02-20
DE69029045T2 (de) 1997-09-25
EP0609155A3 (de) 1994-12-14
FR2655475B1 (fr) 1992-02-21

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