EP0430802A1 - Schirmanordnung für einen Tramformator eines Schaltnetzteiles - Google Patents

Schirmanordnung für einen Tramformator eines Schaltnetzteiles Download PDF

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Publication number
EP0430802A1
EP0430802A1 EP90403369A EP90403369A EP0430802A1 EP 0430802 A1 EP0430802 A1 EP 0430802A1 EP 90403369 A EP90403369 A EP 90403369A EP 90403369 A EP90403369 A EP 90403369A EP 0430802 A1 EP0430802 A1 EP 0430802A1
Authority
EP
European Patent Office
Prior art keywords
transformer
shielding device
edges
ferrite core
bowl
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
EP90403369A
Other languages
English (en)
French (fr)
Other versions
EP0430802B1 (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
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 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 (ie 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, tightly enclosing it to avoid any risk of displacement (such a risk would be contrary to safety standards), and on which one must engage in a soldering 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. It relates for this purpose to an electromagnetic shielding device for switching power supply transformer, intended in particular to equip a television set or a monitor, this device being constituted by a small metal part in the form of a bowl or dish, with a flat bottom. and with flared edges, the flat bottom of this bowl being designed to follow the shape of the upper face of the ferrite core of the transformer, so that this metal part can be easily placed, and fixed for example by gluing, on this core of ferrite with its flared edges directed downward like a hat.
  • flared 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 posed on the ferrite core after preliminary deposit of glue on it (one or two points of glue for example), this glue being advantageously the same as that used to glue 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 method 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 consists of 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 top of the transformer 1 (as shown in phantom 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 desired electromagnetic protection, comply with the galvanic protection standards of the transformer.
  • the simple shape, without cutouts or roughness risking to catch pieces to each other, of the shielding cup 7, and its small size allow it to be easily fed into an automatic robotic 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)
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 true EP0430802A1 (de) 1991-06-05
EP0430802B1 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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5546065A (en) * 1991-09-13 1996-08-13 Vlt Corporation High frequency circuit having a transformer with controlled interwinding coupling and controlled leakage inductances
US6143157A (en) * 1995-11-27 2000-11-07 Vlt Corporation Plating permeable cores

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2756967B1 (fr) * 1996-12-09 1999-01-08 Thomson Television Components Transformateur pour alimentation a haute frequence de decoupage

Citations (5)

* 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
FR2462762A1 (fr) * 1979-08-02 1981-02-13 Bosch Gmbh Robert Capteur d'inductance a anneau en court-circuit
EP0075884A1 (de) * 1981-09-25 1983-04-06 VEB Transformatoren- und Röntgenwerk "Hermann Matern" Hochspannungsabschirmelektrode
EP0081111A1 (de) * 1981-12-04 1983-06-15 Licentia Patent-Verwaltungs-GmbH Transformator, insbesondere für ein Schaltnetzteil in einem Fernsehempfänger

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (5)

* 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
FR2462762A1 (fr) * 1979-08-02 1981-02-13 Bosch Gmbh Robert Capteur d'inductance a anneau en court-circuit
EP0075884A1 (de) * 1981-09-25 1983-04-06 VEB Transformatoren- und Röntgenwerk "Hermann Matern" Hochspannungsabschirmelektrode
EP0081111A1 (de) * 1981-12-04 1983-06-15 Licentia Patent-Verwaltungs-GmbH Transformator, insbesondere für ein Schaltnetzteil in einem Fernsehempfänger

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 332 (E-453)(2388) 12 novembre 1986, & JP-A-61 137309 (NISSIN ELECTRIC CO LTD) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5546065A (en) * 1991-09-13 1996-08-13 Vlt Corporation High frequency circuit having a transformer with controlled interwinding coupling and controlled leakage inductances
US5719544A (en) * 1991-09-13 1998-02-17 Vlt Corporation Transformer with controlled interwinding coupling and controlled leakage inducances and circuit using such transformer
US6653924B2 (en) 1991-09-13 2003-11-25 Vlt Corporation Transformer with controlled interwinding coupling and controlled leakage inductances and circuit using such transformer
US6143157A (en) * 1995-11-27 2000-11-07 Vlt Corporation Plating permeable cores
US6165340A (en) * 1995-11-27 2000-12-26 Vlt Corporation Plating permeable cores

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
EP0609155A2 (de) 1994-08-03
DE69027185D1 (de) 1996-07-04
SG46473A1 (en) 1998-02-20
DE69029045T2 (de) 1997-09-25
EP0609155A3 (de) 1994-12-14
FR2655475B1 (fr) 1992-02-21

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