EP0609155A2 - Schirmanordnung für einen Transformator eines Schaltnetzteiles - Google Patents

Schirmanordnung für einen Transformator eines Schaltnetzteiles Download PDF

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Publication number
EP0609155A2
EP0609155A2 EP94400705A EP94400705A EP0609155A2 EP 0609155 A2 EP0609155 A2 EP 0609155A2 EP 94400705 A EP94400705 A EP 94400705A EP 94400705 A EP94400705 A EP 94400705A EP 0609155 A2 EP0609155 A2 EP 0609155A2
Authority
EP
European Patent Office
Prior art keywords
transformer
shielding device
power supply
switching power
ferrite 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.)
Granted
Application number
EP94400705A
Other languages
English (en)
French (fr)
Other versions
EP0609155B1 (de
EP0609155A3 (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
Orega Electronique et Mecanique
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 Orega Electronique et Mecanique, Thomson Television Components France SA filed Critical Orega Electronique et Mecanique
Publication of EP0609155A2 publication Critical patent/EP0609155A2/de
Publication of EP0609155A3 publication Critical patent/EP0609155A3/de
Application granted granted Critical
Publication of EP0609155B1 publication Critical patent/EP0609155B1/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 an electromagnetic shielding device for switching power supply transformer.
  • 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.
  • 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).
  • This solution gives satisfactory results from the point of view of electromagnetic protection, but however less good than that obtained by the aforementioned total shielding.
  • it remains expensive, since it is an attached part which must be placed with precision around the transformer, by enclosing it tightly to avoid any risk of displacement (such a risk would be contrary to safety standards), and on which one must engage in a welding operation to guarantee its short-circuiting.
  • 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 which they guide and support by 4, and the transformer input / output pins by 5.
  • the invention aims to remedy these drawbacks.
  • a switching power supply transformer intended in particular to equip a television set or a monitor, this device consisting of a single metal part in the form of a bowl or dish, with a flat bottom. and with edges directed downwards, adapting above the transformer, in order to ensure the electromagnetic protection of this transformer so that this metal part can be easily placed, and fixed for example by gluing, on this ferrite core .
  • edges are chosen to be of sufficiently small 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)
EP94400705A 1989-12-01 1990-11-28 Schirmanordnung für einen Transformator eines Schaltnetzteiles Expired - Lifetime EP0609155B1 (de)

Applications Claiming Priority (3)

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.
EP90403369A EP0430802B1 (de) 1989-12-01 1990-11-28 Schirmanordnung für einen Tramformator eines Schaltnetzteiles

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP90403369.3 Division 1990-11-28

Publications (3)

Publication Number Publication Date
EP0609155A2 true EP0609155A2 (de) 1994-08-03
EP0609155A3 EP0609155A3 (de) 1994-12-14
EP0609155B1 EP0609155B1 (de) 1996-10-30

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 After (1)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756967A1 (fr) * 1996-12-09 1998-06-12 Thomson Television Components Transformateur pour alimentation a haute frequence de decoupage

Families Citing this family (2)

* 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

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756967A1 (fr) * 1996-12-09 1998-06-12 Thomson Television Components Transformateur pour alimentation a haute frequence de decoupage
EP0848396A1 (de) * 1996-12-09 1998-06-17 Thomson Television Components France Transformator für Schaltnetzteil
US5982263A (en) * 1996-12-09 1999-11-09 Thomson Television Components France Higher frequency switch mode transformer

Also Published As

Publication number Publication date
EP0430802B1 (de) 1996-05-29
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
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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