EP0430802A1 - Shielding device for a switching power supply transformer - Google Patents
Shielding device for a switching power supply transformer Download PDFInfo
- 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
Links
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract 3
- 230000001070 adhesive effect Effects 0.000 claims abstract 3
- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 4
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 239000000470 constituent Substances 0.000 claims 1
- 230000008021 deposition Effects 0.000 abstract 1
- 239000003292 glue Substances 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 210000001015 abdomen Anatomy 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 235000012771 pancakes Nutrition 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 235000012431 wafers Nutrition 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
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)
Abstract
Description
La présente invention se rapporte à un dispositif de blindage électromagnétique pour transformateur d'alimentation à découpage.The present invention relates to an electromagnetic shielding device for switching power supply transformer.
Les alimentations à découpage équipent actuellement la grande majorité des téléviseurs et des moniteurs pour installations informatiques. Chacune de ces alimentations est pourvue d'un transformateur placé sur un chassis, qui est lui même positionné en dessous du tube cathodique du téléviseur ou du moniteur.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.
Ces alimentations fonctionnent par hachage, ou découpage, du courant, et ce découpage a pour effet néfaste d'induire, au niveau du transformateur, des rayonnements électromagnétiques parasites qui viennent agir sur les récepteurs électromagnétiques que constituent en particulier les bobines déflectrices du tube cathodique. Il en résulte des perturbations d'image qui sont plus ou moins importantes, c'est-à-dire plus ou moins visibles, selon la valeur de la fréquence de découpage, la position géographique du transformateur, et la sensibilité des bobines déflectrices.These power supplies operate by chopping, or cutting, the current, and this cutting has the harmful effect of inducing, at the level of the transformer, parasitic electromagnetic radiation which comes to act on the electromagnetic receivers which constitute in particular the deflection coils of the cathode ray tube. This results in image disturbances which are more or less significant, that is to say more or less visible, depending on the value of the switching frequency, the geographic position of the transformer, and the sensitivity of the deflection coils.
Dans le cas où il s'agit d'une fréquence de découpage synchronisée et de valeur fixe, ces perturbations électromagnétiques existent bien, mais elles ne se matérialisent fort heureusement pas sur l'écran car elles apparaissent pendant un laps de temps où le spot balayage est sur sa phase de retour.In the case where it is a synchronized switching frequency and of fixed value, these electromagnetic disturbances do exist, but they fortunately do not materialize on the screen because they appear during a period of time when the spot scanning is on its return phase.
En revanche, certaines alimentations à découpage fonctionnent à une fréquence qui varie de manière importante en fonction de la puissance électrique demandée par le téléviseur ou le moniteur, en fonction de sa tension d'alimentation, et en fonction de ce qui va être demandé au transformateur. Cette fréquence de découpage varie alors constamment, et il en résulte un phénomène de battement entre cette dernière et la fréquence, fixe, de balayage du spot du téléviseur ou du moniteur. Ce battement de fréquences produit sur l'écran un phénomène de pollution d'image qui se traduit visuellement par un "moirage" horizontal plus ou moins sombre, c'est-à-dire par une bande grisâtre qui défile sur l'écran du tube cathodique, ce qui n'est bien entendu pas admissible dans la grande majorité des cas. Comme il n'est généralement pas possible de déplacer géographiquement le transformateur de découpage d'une distance suffisante (il faudrait alors le sortir complètement du chassis du téléviseur ou du moniteur), il convient de trouver une autre solution pour remédier à ce phénomène de pollution d'image.On the other hand, certain switching power supplies operate at a frequency which varies significantly depending on the electrical power required by the television or the monitor, according to its supply voltage, and according to what will be asked of the transformer. . This chopping frequency then varies constantly, and this results in a phenomenon of beat between the latter and the fixed frequency of TV or monitor spot scan. This beat of frequencies produces on the screen a phenomenon of image pollution which is reflected visually by a more or less dark horizontal "moiré", that is to say by a grayish band which scrolls on the screen of the tube cathodic, which is of course not admissible in the vast majority of cases. As it is generally not possible to move the switching transformer geographically a sufficient distance (it would then have to be removed completely from the chassis of the television or monitor), another solution should be found to remedy this pollution phenomenon image.
Il serait pensable, en premier lieu, d'inverser le champ électromagnétique parasite émis par le transformateur de découpage, en inversant ses bobinages pour déplacer ce champ. Un tel palliatif s'avère malheureusement insuffisant pour éviter efficacement la pollution d'image précitée, et il convient donc finalement de prévoir un dispositif de blindage de ce transformateur.It would be conceivable, firstly, to reverse the parasitic electromagnetic field emitted by the switching transformer, by reversing its windings to move this field. Such a palliative unfortunately turns out to be insufficient to effectively avoid the aforementioned image pollution, and it is therefore ultimately necessary to provide a shielding device for this transformer.
Un premier dispositif de blindage, existant actuellement sur ces transformateurs, est constitué par un capot métallique qui enveloppe totalement le transformateur, ce qui donne bien entendu un excellent résultat du point de vue de la protection contre les pollutions d'image précitées. Il s'agit cependant là d'une pièce de grand volume, onéreuse en coût de fabrication (ne serait-ce que par le prix de la matière première). En outre, ce capot très enveloppant tend à réduire les distances de sécurité entre les deux circuits primaire et secondaire du transformateur, car il passe à proximité de certaines sorties de câble ou de fils: pour respecter les normes obligatoires d'isolement galvanique, il est alors la plupart du temps nécessaire d'isoler l'intérieur de ce capot métallique par le dépôt d'une couche de matériau isolant. Il est en outre généralement nécessaire d'isoler de la même façon sa partie extérieure, car ce capot arrive souvent à une distance des composants électroniques, situés sur la platine du téléviseur, qui est trop faible pour respecter les normes de sécurité. Il en résulte une augmentation du prix de revient, déjà élevé, de cette pièce de blindage.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. However, this is a large volume item, expensive in manufacturing cost (if only by the price of the raw material). In addition, 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. It is also generally necessary to isolate in the same way its external part, because this cover often arrives at a distance from the electronic components, located on the plate of the television set, which is too weak to respect the safety standards. This results in an increase in the already high cost price of this shielding part.
Une autre solution de blindage consiste à prévoir une boucle magnétique, constituée par une bande annulaire en cuivre qui enserre la partie médiane du transformateur de manière parallèle à la platine sur laquelle ses broches de sortie sont soudées.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.
S'agissant d'un transformateur en mode "couches", la mise en place de cet anneau de blindage s'effectue directement par enroulement étroit et soudage de cette boucle autour du "ventre" du transformateur (c'est-à-dire autour de la partie qui comporte son bobinage). Cette solution donne des résultats satisfaisants du point de vue de la protection électromagnétique, mais toutefois moins bons que celui obtenu par le blindage total précité. Elle reste malgré tout onéreuse, car il s'agit d'une pièce rapportée qui doit être placée avec précision autour du transformateur, en l'enserrant étroitement pour éviter tout risque de déplacement (un tel risque serait contraire aux normes de sécurité), et sur laquelle on doit se livrer à une opération de soudure pour garantir sa mise en court-circuit.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. However, 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.
Par ailleurs, ces transformateurs en mode couches tendent de plus en plus à être remplacés par des transformateurs en mode "galettes", pour des raisons évidentes de facilité d'automatisation de leur mode de fabrication. Un transformateur de ce type est représenté, sous référence générale 1 sur la figure 1 jointe.Furthermore, these 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.
Sur cette figure, le noyau de ferrite du transformateur est désigné par la référence 2, les "galettes" par 3, les fils qu'elles guident et supportent par 4, et les broches d'entrées/sorties du transformateur par 5.In this figure, the ferrite core of the transformer is designated by the
Pour un tel transformateur, il n'est bien évidemment pas possible de prévoir un ruban métallique court-circuité lui enserrant le ventre, car les galettes 3 sont pourvues de parties saillantes de forme tourmentée. La solution qui est alors adoptée consiste à prévoir un capot 6 en matière plastique, qui enveloppe totalement le transformateur 1 comme représenté au dessin, et autour duquel a été préalablement fixée une boucle métallique de blindage 7, semblable en hauteur et épaisseur à elles prévues pour les transformateurs du type couche. Cette pièce 6, 7 vient se fixer par encliquetage sur le transformateur 1. Il s'agit encore là d'une pièce qui, comme la précédente, est onéreuse en coût de fabrication, et qui se prête mal à une mise en place automatique sur une chaîne de fabrication de ces transformateurs de découpage. En outre, comme dans le cas précédent, les performances de protection électromagnétique obtenues ne sont pas absolument parfaites.For such a transformer, it is obviously not possible to provide a short-circuited metal strip enclosing the belly, because the
L'invention vise à remédier à ces inconvénients. Elle se rapporte à cet effet à un dispositif de blindage électromagnétique pour transformateur d'alimentation à découpage, destiné en particulier à équiper un téléviseur ou un moniteur, ce dispositif étant constitué par une petite pièce métallique en forme de cuvette ou coupelle, à fond plat et à bords évasés, le fond plat de cette cuvette étant conçu pour épouser la forme de la face supérieure du noyau de ferrite du transformateur, de telle sorte que cette pièce métallique puisse être aisément posée, et fixée par exemple par collage, sur ce noyau de ferrite avec ses bords évasés dirigés vers le bas à la manière d'un chapeau. Ces bords évasés sont choisis de largeur suffisamment faible pour ne pas affecter l'isolement galvanique procuré par le transformateur, mais toutefois assez importante pour d'une part permettre la mise en place aisée (par exemple par robot) de cette coupelle sur le sommet du transformateur et pour d'autre part assurer la protection électromagnétique souhaitée. Cette pièce est préférentiellement réalisée par emboutissage. Elle se pose sur le noyau de ferrite après dépose préalable de colle sur celui-ci (un ou deux points de colle par exemple), cette colle étant avantageusement la même que celle utilisée pour coller entre eux les éléments de ce noyau de ferrite. Ces opérations de collage et de mise en place s'effectuent aisément par une chaîne de robotisation automatique.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. These 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.
De toute façon, l'invention sera bien comprise, et ses avantages et autres caractéristiques ressortiront, lors de la description suivante d'un exemple non limitatif de réalisation, en référence à la figure 2 jointe, qui représente, en perspective et à l'échelle 1, ce dispositif de blindage et son mode de mise en place sur un transformateur d'alimentation à découpage.In any case, the invention will be well understood, and its advantages and other characteristics will emerge during the following description of a nonlimiting exemplary embodiment, with reference to FIG. 2 attached, which represents, in perspective and in scale 1, this shielding device and its method of installation on a switching power supply transformer.
En se référant à cette figure 2, le transformateur d'alimentation à découpage 1 de la figure 1 y est représenté en perspective, avec son noyau de ferrite 2, ses galettes 3, ses fils de connexions 4, et ses broches d'entrée/sortie 5.Referring to this FIG. 2, the switching power supply transformer 1 of FIG. 1 is shown there in perspective, with its
Le dispositif de blindage électromagnétique est constitué par une cuvette, ou coupelle, 7 en cuivre, réalisée par emboutissage. Le fond plat 8 de cette coupelle est rectangulaire et a les mêmes dimensions extérieures que celles de la face rectangulaire supérieure 9 du noyau de ferrite 2. La coupelle 7 peut être en Al, laiton, etc...The electromagnetic shielding device consists of a bowl, or cup, 7 made of copper, produced by stamping. The
Les bords 10 de la coupelle 7 sont évasés, avec une pente angulaire α par rapport à l'axe perpendiculaire au plan du fond 8 qui, étant de l'ordre de 15 à 20 degrés par exemple, est optimisée à la fois pour permettre la mise en place automatique aisée du chapeau 7 sur le dessus du transformateur 1 (comme indiqué en traits mixtes sur le dessin) avec les bords 10 orientés vers le bas, et pour assurer la protection électromagnétique souhaitée.The
La largeur L de ces bords 10 est choisie faible (de l'ordre de quelques millimètres par exemple): elle doit être suffisante pour faciliter au maximum la mise en place de la coupelle 7 sur la face supérieure 9 du noyau 2, mais pas trop importante pour, tout en assurant la protection électromagnétique souhaitée, respecter les normes de protection galvanique du transformateur.The width L of these
La forme simple, sans découpes ou aspérités risquant de provoquer des accrochages de pièces l'une à l'autre, de la coupelle de blindage 7, et sa petite taille permettent son alimentation aisée dans une chaîne automatique robotisée, avec bol vibrant, sans modification sensible des lignes de fabrication.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.
Préalablement à la pose de la coupelle 7 par robot ―suivant la flèche F et avec les bords 10 orientés vers le bas― sur le dessus 9 du transformateur 1, il est déposé, sur cette face supérieure 9 du noyau de ferrite 2, deux points de colle 11, 12, cette colle étant avantageusement la même que celle utilisée pour assembler en 13 les deux moitiés du noyau de ferrite 2 (ce qui est très avantageux du point de vue approvisionnement en colle, pour lequel aucun surcoût n'est de ce fait entraîné en pratique).Prior to the installation of the cup 7 by robot ―follow the arrow F and with the
Les performances de protection électromagnétique des bobines déflectrices des téléviseurs et moniteurs sont, avec ce dispositif de blindage, pratiquement parfaites.The electromagnetic protection performance of the deflection coils of televisions and monitors is, with this shielding device, practically perfect.
Comme il va de soi, l'invention n'est pas limitée à l'exemple de réalisation qui vient d'être décrit, mais elle est, bien au contraire, susceptible d'être réalisée sous d'autres formes équivalentes.As is obvious, the invention is not limited to the embodiment which has just been described, but it is, quite the contrary, capable of being produced in other equivalent forms.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94400705A EP0609155B1 (en) | 1989-12-01 | 1990-11-28 | Shielding device for a switching power supply transformer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8915884 | 1989-12-01 | ||
| FR8915884A FR2655475B1 (en) | 1989-12-01 | 1989-12-01 | SHIELDING DEVICE FOR A CUT-OUT POWER TRANSFORMER. |
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 (en) | 1991-06-05 |
| EP0430802B1 EP0430802B1 (en) | 1996-05-29 |
Family
ID=9388042
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90403369A Expired - Lifetime EP0430802B1 (en) | 1989-12-01 | 1990-11-28 | Shielding device for a switching power supply transformer |
| EP94400705A Expired - Lifetime EP0609155B1 (en) | 1989-12-01 | 1990-11-28 | Shielding device for a switching power supply transformer |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94400705A Expired - Lifetime EP0609155B1 (en) | 1989-12-01 | 1990-11-28 | Shielding device for a switching power supply transformer |
Country Status (5)
| Country | Link |
|---|---|
| EP (2) | EP0430802B1 (en) |
| DE (2) | DE69027185T2 (en) |
| ES (2) | ES2097613T3 (en) |
| FR (1) | FR2655475B1 (en) |
| SG (2) | SG46473A1 (en) |
Cited By (2)
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2756967B1 (en) * | 1996-12-09 | 1999-01-08 | Thomson Television Components | TRANSFORMER FOR HIGH-CUT FREQUENCY POWER SUPPLY |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1069711B (en) * | 1959-11-26 | |||
| CH607264A5 (en) * | 1975-05-23 | 1978-11-30 | Landis & Gyr Ag | Instrument transformer with earthed screen between windings |
| FR2462762A1 (en) * | 1979-08-02 | 1981-02-13 | Bosch Gmbh Robert | Short circuit ring transducer with laminated iron core - has plate end electrically conducting screening to suppress stray field effects |
| EP0075884A1 (en) * | 1981-09-25 | 1983-04-06 | VEB Transformatoren- und Röntgenwerk "Hermann Matern" | High tension shielding electrode |
| EP0081111A1 (en) * | 1981-12-04 | 1983-06-15 | Licentia Patent-Verwaltungs-GmbH | Transformer, particularly for a switching mode power supply circuit in a television receiver |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT8334023V0 (en) * | 1983-05-09 | 1983-05-09 | Ducati Elettrotecnica Spa | SMT TRANSFORMER WITH FERRITE CORE. |
| JPS61137309A (en) * | 1984-12-08 | 1986-06-25 | Nissin Electric Co Ltd | Gas insulated potential transformer |
-
1989
- 1989-12-01 FR FR8915884A patent/FR2655475B1/en not_active Expired - Lifetime
-
1990
- 1990-11-28 EP EP90403369A patent/EP0430802B1/en not_active Expired - Lifetime
- 1990-11-28 DE DE69027185T patent/DE69027185T2/en not_active Expired - Fee Related
- 1990-11-28 DE DE69029045T patent/DE69029045T2/en not_active Expired - Fee Related
- 1990-11-28 EP EP94400705A patent/EP0609155B1/en not_active Expired - Lifetime
- 1990-11-28 ES ES94400705T patent/ES2097613T3/en not_active Expired - Lifetime
- 1990-11-28 SG SG1996004968A patent/SG46473A1/en unknown
- 1990-11-28 ES ES90403369T patent/ES2088424T3/en not_active Expired - Lifetime
- 1990-11-28 SG SG1996008990A patent/SG46710A1/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1069711B (en) * | 1959-11-26 | |||
| CH607264A5 (en) * | 1975-05-23 | 1978-11-30 | Landis & Gyr Ag | Instrument transformer with earthed screen between windings |
| FR2462762A1 (en) * | 1979-08-02 | 1981-02-13 | Bosch Gmbh Robert | Short circuit ring transducer with laminated iron core - has plate end electrically conducting screening to suppress stray field effects |
| EP0075884A1 (en) * | 1981-09-25 | 1983-04-06 | VEB Transformatoren- und Röntgenwerk "Hermann Matern" | High tension shielding electrode |
| EP0081111A1 (en) * | 1981-12-04 | 1983-06-15 | Licentia Patent-Verwaltungs-GmbH | Transformer, particularly for a switching mode power supply circuit in a television receiver |
Non-Patent Citations (1)
| 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)
| 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 |
|---|---|
| SG46473A1 (en) | 1998-02-20 |
| EP0430802B1 (en) | 1996-05-29 |
| EP0609155A2 (en) | 1994-08-03 |
| DE69029045D1 (en) | 1996-12-05 |
| ES2097613T3 (en) | 1997-04-01 |
| EP0609155B1 (en) | 1996-10-30 |
| FR2655475A1 (en) | 1991-06-07 |
| FR2655475B1 (en) | 1992-02-21 |
| DE69027185T2 (en) | 1996-11-07 |
| DE69029045T2 (en) | 1997-09-25 |
| ES2088424T3 (en) | 1996-08-16 |
| EP0609155A3 (en) | 1994-12-14 |
| DE69027185D1 (en) | 1996-07-04 |
| SG46710A1 (en) | 1998-02-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0889541A1 (en) | Helix antenna with variable length | |
| EP0609155B1 (en) | Shielding device for a switching power supply transformer | |
| EP0381580A1 (en) | High-voltage power supply device for an X-ray tube | |
| FR2793639A3 (en) | Induction a.c. voltage source for a video amplifier | |
| EP0230819A1 (en) | Miniaturised gyromagnetic device and method for assembling the same | |
| FR3004579A1 (en) | ||
| FR3075387B1 (en) | ELECTRIC CURRENT MEASURING DEVICE, CURRENT MEASURING APPARATUS, AND METHOD FOR MANUFACTURING CURRENT MEASURING DEVICE | |
| WO1987003736A1 (en) | Magnetic circuit with low radiated magnetic field, particularly for a high voltage transformer supplying a cathode tube | |
| EP1019926B1 (en) | Inductive component and method for making same | |
| EP0695944A1 (en) | Single-pole voltage tester, especially for electrical overhead line | |
| EP0236642B1 (en) | High-voltage transformer | |
| EP1063468A1 (en) | Lamp, in particular beacon light for air navigation height obstacles | |
| FR2794281A1 (en) | Circuit breaker/electronic card connection having flexible U-shaped support/connection end and card position slotting card contact elements connecting. | |
| EP0727794B1 (en) | Transformer, in particular for energy converter, and resonant energy converter with such a transformer | |
| FR2657486A1 (en) | Appliance for cooking by electromagnetic induction | |
| EP0070234A2 (en) | Electro-optic device whose semiconductor structure comprises emitter and receiver sections, and light-emitting diode regulating device | |
| FR2623021A1 (en) | Earthing device for receiver or transmitter antenna of electromagnetic waves, especially for car radio and antenna equipped with such an earthing device | |
| EP0721239B1 (en) | Manufacturing process for an electrical cable connector, electrical cable and high-voltage transformer provided with such cables | |
| FR2717901A1 (en) | Current sensing device | |
| FR2462082A1 (en) | High-power UHF or VHF microstrip device - has power transistors easily replaced without requiring readjustment | |
| EP0705528B1 (en) | High voltage generator | |
| FR2556879A1 (en) | Fixing device for a toroidal magnetic circuit. | |
| EP0280624A1 (en) | Device to position a magnetic circuit in relation to a coil of a high-tension transformer | |
| FR2601487A1 (en) | Automatic apparatus for showing films, especially advertising films within transport vehicles | |
| FR2475811A1 (en) | ALTERNATING CURRENT ISOLATED CORD ASSEMBLY AND CONSTRAINING BUSHING, FOR ELECTRONIC DOMESTIC APPLIANCES |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE DK ES FR GB IT SE |
|
| 17P | Request for examination filed |
Effective date: 19911123 |
|
| 17Q | First examination report despatched |
Effective date: 19921007 |
|
| RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: THOMSON TELEVISION COMPONENTS FRANCE |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE DK ES FR GB IT SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DK Effective date: 19960529 |
|
| XX | Miscellaneous (additional remarks) |
Free format text: TEILANMELDUNG 94400705.3 EINGEREICHT AM 28/11/90. |
|
| REF | Corresponds to: |
Ref document number: 69027185 Country of ref document: DE Date of ref document: 19960704 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: BA2A Ref document number: 2088424 Country of ref document: ES Kind code of ref document: T3 |
|
| ITF | It: translation for a ep patent filed |
Owner name: BARZANO' E ZANARDO MILANO S.P.A. |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2088424 Country of ref document: ES Kind code of ref document: T3 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19960829 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19960823 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 19991118 Year of fee payment: 10 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 19991123 Year of fee payment: 10 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 19991229 Year of fee payment: 11 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20001009 Year of fee payment: 11 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001129 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010731 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20011128 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20020702 |
|
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20011128 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20011214 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20051128 |