EP0609155B1 - Shielding device for a switching power supply transformer - Google Patents
Shielding device for a switching power supply transformer Download PDFInfo
- Publication number
- EP0609155B1 EP0609155B1 EP94400705A EP94400705A EP0609155B1 EP 0609155 B1 EP0609155 B1 EP 0609155B1 EP 94400705 A EP94400705 A EP 94400705A EP 94400705 A EP94400705 A EP 94400705A EP 0609155 B1 EP0609155 B1 EP 0609155B1
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- EP
- European Patent Office
- Prior art keywords
- transformer
- ferrite core
- power supply
- switching power
- shielding device
- 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
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- 229910000859 α-Fe Inorganic materials 0.000 claims description 13
- 238000012216 screening Methods 0.000 claims 2
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- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000003292 glue Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 235000012771 pancakes Nutrition 0.000 description 3
- 238000003466 welding 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
- 238000002955 isolation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
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- 230000005672 electromagnetic field Effects 0.000 description 1
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- 238000009415 formwork Methods 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
- 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
- 230000001360 synchronised effect Effects 0.000 description 1
- 235000012431 wafers Nutrition 0.000 description 1
Images
Classifications
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- 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
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- 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 equipped 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 of material but the problem of space remains whole.
- 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, 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 welding operation to guarantee its short-circuiting.
- 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 wire which they guide and support by 4, and the input / output pins of the transformer 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.
- the shielding means consist of a single cup in the form of a bowl having a flat bottom designed to conform to the shape of the flat face of the ferrite core opposite the connections and of the edges oriented towards the core. This metal cup 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.
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- 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)
Description
La présente invention se rapporte à un transformateur d'alimentation à découpage équipé de moyens de blindage électromagnétique.The present invention relates to a switching power supply transformer equipped with electromagnetic shielding means.
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 "moire", 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 completely removed 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 coils 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. La demande de brevet DE 1069711 de SIEMENS propose un coffrage formé de deux coffres métalliques dont les rebords sont en vis-à-vis mais ne se rejoignent pas. Il y a ainsi une économie de matière mais le problème de l'encombrement reste entier.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 cost price, already high, of this shielding part. 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 of material but the problem of space remains whole.
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 bon 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 (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. 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 welding operation to guarantee its short-circuiting.
Le brevet EP 0131700 décrit une solution évitant la nécessité d'une soudure. L'assemblage du transformateur est réalisé au moyen d'une cage métallique encliquetable d'un seul tenant qui comporte l'anneau de blindage.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.
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
Sur cette figure, le noyau de ferrite du transformateur est désigné par la référence 2, les "galettes" par 3, le 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 celles prévues pour les transformateurs de type "couches". 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 "pancakes" 3 are provided with protruding parts of tormented shape. The solution which is then adopted consists in providing a
L'invention vise à remédier à ces inconvénients. Elle se rapporte à cet effet à un transformateur d'alimentation à découpage destiné en particulier à équiper un téléviseur ou un moniteur, le transformateur étant équipé de connexions, d'un noyau de ferrite ayant une face plane située à l'opposé des connexions et de moyens de blindage électromagnétiques. Les moyens de blindage sont constitués par une seule coupelle en forme de cuvette ayant un fond plat conçu pour épouser la forme de la face plane du noyau de ferrite opposée aux connexions et des bords orientés vers le noyau. Cette coupelle métallique peut être aisément posée, et fixée par exemple par collage, sur ce noyau de ferrite. Ces bords 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. 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. The shielding means consist of a single cup in the form of a bowl having a flat bottom designed to conform to the shape of the flat face of the ferrite core opposite the connections and of the edges oriented towards the core. This metal cup can be easily placed, and fixed for example by gluing, on this ferrite core. These 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.
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
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
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 is constituted by 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 cuts or roughness risking to catch pieces to each other, of the
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
Les performances de protection électromagnétique des bobines déflectrices des téléviseurs et moniteurs sont, avec ce dispositif de blindage, pratiquement parfaites.The electromagnetic protection performances of the deflection coils of televisions and monitors are, 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, on the contrary, capable of being produced in other equivalent forms.
Claims (3)
- Switched-mode power supply transformer (1), intended in particular to equip a television set or a monitor, the transformer being equipped with connections (5), with a ferrite core (2) having a flat face (9) situated at the opposite end to the connections (5), and with electromagnetic screening means, characterized in that the screening means consist of a single tray (7) in the shape of a trough having a flat bottom (8) designed to match the shape of the flat face (9) of the ferrite core (2) opposite the connections (5), and of the edges (10) turned towards the core (2).
- Transformer (1) according to Claim 1, characterized in that the tray (7) is fixed to the ferrite core (2) by bonding by means of an adhesive which is the same as that used to assemble the constituent elements of the core of the transformer.
- Television set or monitor equipped with a transformer (1) according to one of Claims 1 or 2.
Applications Claiming Priority (3)
| 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. |
| EP90403369A EP0430802B1 (en) | 1989-12-01 | 1990-11-28 | Shielding device for a switching power supply transformer |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90403369.3 Division | 1990-11-28 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0609155A2 EP0609155A2 (en) | 1994-08-03 |
| EP0609155A3 EP0609155A3 (en) | 1994-12-14 |
| EP0609155B1 true EP0609155B1 (en) | 1996-10-30 |
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 Before (1)
| 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 |
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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3311391B2 (en) | 1991-09-13 | 2002-08-05 | ヴィエルティー コーポレーション | Leakage inductance reducing transformer, high frequency circuit and power converter using the same, and method of reducing leakage inductance in transformer |
| DE69631462D1 (en) * | 1995-11-27 | 2004-03-11 | Vlt Corp | Plating permeable cores |
| FR2756967B1 (en) * | 1996-12-09 | 1999-01-08 | Thomson Television Components | TRANSFORMER FOR HIGH-CUT FREQUENCY POWER SUPPLY |
Family Cites Families (7)
| 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 |
| DE2931382A1 (en) * | 1979-08-02 | 1981-02-26 | Bosch Gmbh Robert | SHORT RING SENSOR |
| DD200830A1 (en) * | 1981-09-25 | 1983-06-15 | Martin Dietrich | HOCHSPANNUNGSABSCHIRMELEKTRODE |
| DE3147984A1 (en) * | 1981-12-04 | 1983-06-16 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | TRANSFORMER, ESPECIALLY FOR A SWITCHING POWER SUPPLY IN A TELEVISION RECEIVER |
| 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 SG SG1996004968A patent/SG46473A1/en unknown
- 1990-11-28 ES ES94400705T patent/ES2097613T3/en not_active Expired - Lifetime
- 1990-11-28 ES ES90403369T patent/ES2088424T3/en not_active Expired - Lifetime
- 1990-11-28 SG SG1996008990A patent/SG46710A1/en unknown
- 1990-11-28 DE DE69027185T patent/DE69027185T2/en not_active Expired - Fee Related
- 1990-11-28 EP EP90403369A patent/EP0430802B1/en not_active Expired - Lifetime
- 1990-11-28 EP EP94400705A patent/EP0609155B1/en not_active Expired - Lifetime
- 1990-11-28 DE DE69029045T patent/DE69029045T2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE69029045T2 (en) | 1997-09-25 |
| DE69027185T2 (en) | 1996-11-07 |
| FR2655475B1 (en) | 1992-02-21 |
| EP0609155A2 (en) | 1994-08-03 |
| DE69027185D1 (en) | 1996-07-04 |
| SG46473A1 (en) | 1998-02-20 |
| ES2097613T3 (en) | 1997-04-01 |
| EP0609155A3 (en) | 1994-12-14 |
| EP0430802A1 (en) | 1991-06-05 |
| ES2088424T3 (en) | 1996-08-16 |
| FR2655475A1 (en) | 1991-06-07 |
| EP0430802B1 (en) | 1996-05-29 |
| SG46710A1 (en) | 1998-02-20 |
| DE69029045D1 (en) | 1996-12-05 |
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