EP0464569A1 - Symmetric transformer for transmission equipment - Google Patents

Symmetric transformer for transmission equipment Download PDF

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Publication number
EP0464569A1
EP0464569A1 EP19910110395 EP91110395A EP0464569A1 EP 0464569 A1 EP0464569 A1 EP 0464569A1 EP 19910110395 EP19910110395 EP 19910110395 EP 91110395 A EP91110395 A EP 91110395A EP 0464569 A1 EP0464569 A1 EP 0464569A1
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Prior art keywords
primary
windings
winding
transformer
screen
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EP19910110395
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German (de)
French (fr)
Inventor
Dany C/O Alcatel Business Systems Jenneve
Hubert Rinie
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ALE International SAS
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Alcatel Business Systemes SA
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Publication of EP0464569A1 publication Critical patent/EP0464569A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • 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
    • 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

Definitions

  • the invention relates to a symmetrical transformer for transmission equipment, in particular for a standard S-type interface of a digital network with service integration.
  • transformers which are used for the transmission of impulse data signals via pairs of wires between two telecommunications equipment, are required to comply with relatively severe, standardized constraints, such as those established by standard 1.430 of the International Circuit and Telephone Consultative Committee (CCITT).
  • CITT International Circuit and Telephone Consultative Committee
  • Such standards define in particular the minimum permissible galvanic isolation, as well as impedance, pulse and symmetry templates with respect to the earth.
  • the present invention therefore provides a symmetrical transformer for transmission equipment which does not require the addition of additional corrective components to ensure the transmission of digital data in pulse differential form in cooperation with a link constituted by a pair of wires and which has a significant galvanic isolation, despite its small volume.
  • This symmetrical transformer conventionally consists of a magnetic carcass, a mid-point primary intended to be connected to two wires of a transmission link by its ends, a secondary also intended to be connected to two wires d 'a second transmission link by its ends, as well as an electromagnetic screen interposed between primary and secondary and galvanically isolated from this primary and this secondary.
  • the primary of the transformer is divided, equally, in two concentric windings, interconnected, between which the secondary is sandwiched and in that the electromagnetic screen is split into two elements respectively inserted each between one of the concentric windings of the primary and the secondary with which these two elements are coaxially wound.
  • the transformer for transmission equipment presented in FIG. 1 is conventionally made up of a magnetic carcass not shown, of a primary 1 with a mid-point PM intended to be connected to two wires of a transmission link by its ends P1 and P2 , a secondary also intended to be connected to two wires of a second transmission link by its ends S1 and S2, as well as an electromagnetic screen 3 interposed between primary 1 and secondary 2 .
  • Such a transformer is conventionally used for the transmission of signals of at least roughly alternative type, it is ill-suited to the transmission of high-speed pulse signals such as those capable of being transmitted by an interface S of a digital network with service integration. , for the reasons mentioned above.
  • the primary 1 of the transformer according to the invention has two windings 10 and 11, almost identical and physically distinct, it is possibly the same for secondary 2 which then consists of one or from here two theoretically identical windings 20 and 21, the assembly is arranged so as to have the most perfect symmetry possible, both from the point of view of stray capacitances and resistances.
  • the positioning of the secondary between the two windings 10 and 11 of the primary makes it possible to obtain a low leakage self.
  • the numbers of turns of the layers of each winding are chosen to correspond to whole numbers of layers.
  • Balancing between the resistances of the windings 10 and 11 of the primary is obtained by modifying the diameter of the wires making up these windings, the wire of the winding 11, wound more outwardly relative to the core 4, being chosen larger than that of the winding 10 which it surrounds, in order to compensate for the differences in length.
  • the winding 10 has 32 turns of a wire with a diameter of 0.14 mm while the winding 11, inside which it is located, has 32 turns of 0.18 mm, l one and the other being externally covered with an insulating layer 50, for example a layer of insulating tape, such as 50 for the winding 10 and 51 for the winding 11.
  • an insulating layer 50 for example a layer of insulating tape, such as 50 for the winding 10 and 51 for the winding 11.
  • the parasitic capacity between the screen and the primary is favored compared to the capacity between this screen and the secondary.
  • the parasitic capacity of the secondary 2 must be limited to the maximum all the more since this secondary must most often be produced in two concentric windings 20 and 21 given the number of turns and the minimum desired winding height.
  • An insulating layer 53 is therefore provided to minimize the parasitic capacitance between the secondary windings 20 and 21.
  • the screen 3 is made of two interconnected elements 30 and 31 which are individually inserted each between one of the primary windings 10, 11 and one of the secondary windings 20, 21.
  • the screen element 30 consists of a conductive layer for example of copper which is externally wound on the insulating layer 50, the latter itself covers the internal primary winding 10.
  • An insulating layer 52 is in turn wound externally on the screen element 30, it is here constituted with the same insulating tape material as the layer 50, but under a double thickness.
  • An insulating layer 53 identical to the layer 52 is wound on the secondary winding 20 to separate it from the winding 21 inside the assembly wound inside the carcass, not shown, of the transformer of which they are a part, it being understood that these secondary windings are electrically connected, here inside the wound assembly.
  • Two insulating layers 54 and 55 are wound on either side of the second screen element 31, they are respectively of the same nature and of the same thickness as the insulating layers 52 and 50 to which they correspond respectively.
  • the external secondary winding 21 is therefore separated from the screen element 31 by a thickness of insulation twice that which separates the latter from the secondary winding 11 on which both are wound the first named on the second named.
  • the thickness of the insulating layer 53 between the secondary windings 20 and 21 is chosen to be equal to that of the layers 54 and 52 consequently reducing the capacity between these windings and the capacity seen from the corresponding primary.
  • the parasitic capacity of the secondary of the transformer is therefore reduced and the primary is therefore less sensitive to the influence of this secondary and more sensitive to the effects of screens 30 and 31, which facilitates its balancing with respect to earth.
  • a significant dielectric strength, for example greater than 1.5 kV rms, between primary and secondary is simultaneously capable of being obtained, it is here reinforced at the end terminals of the windings P1, P2, S1, S2 which are conventionally assembled at very short distance, by covering the pins constituting these terminals by a drop of hardening material of high dielectric strength.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Coils Of Transformers For General Uses (AREA)

Abstract

Symmetric transformer, for transmission equipment, consisting of a primary, a secondary and an electromagnetic screen interposed between this primary and this secondary from which it is electrically isolated. The primary of the transformer is divided into two interconnected concentric windings (10, 11) between which the secondary (2) is sandwiched, and the electromagnetic screen is divided into two interconnected elements (30, 31), each respectively inserted between one of the concentric windings of the primary and the secondary and with which these two elements are coaxially wound. <IMAGE>

Description

L'invention concerne un transformateur symétrique pour équipement de transmission, notamment pour interface normalisée de type S de réseau numérique à intégration de services.The invention relates to a symmetrical transformer for transmission equipment, in particular for a standard S-type interface of a digital network with service integration.

De manière connue, les transformateurs, qui sont mis en oeuvre pour la transmission de signaux impulsionnels de données par l'intermédiaire de paires de fils entre deux équipements de télécommunications, sont tenus au respect de contraintes relativement sévères, normalisées, telles celles qui sont établies par la norme 1.430 du Comité Consultatif International Télégraphique et Téléphonique (CCITT) .In known manner, the transformers, which are used for the transmission of impulse data signals via pairs of wires between two telecommunications equipment, are required to comply with relatively severe, standardized constraints, such as those established by standard 1.430 of the International Telegraph and Telephone Consultative Committee (CCITT).

De telles normes définissent en particulier l'isolation galvanique minimale admissible, ainsi que des gabarits d'impédance, d'impulsion et de symétrie par rapport à la terre.Such standards define in particular the minimum permissible galvanic isolation, as well as impedance, pulse and symmetry templates with respect to the earth.

Il est ainsi connu d'imposer une tenue des transformateurs de transmission à une tension efficace d'au moins 1,5 kV, soit une valeur très supérieure aux tensions normalement présentes en ligne.It is thus known to impose a behavior of transmission transformers at an effective voltage of at least 1.5 kV, ie a value much higher than the voltages normally present in line.

Il existe des transformateurs de transmission de données susceptibles d'assurer une isolation galvanique dans ces conditions, ce sont actuellement des composants relativement volumineux et dont l'association aux composants miniatures des équipements tels que l'interface évoquée plus haut n'est par conséquent pas très satisfaisante.There are data transmission transformers capable of providing galvanic isolation under these conditions, these are currently relatively large components and whose association with miniature components of equipment such as the interface mentioned above is therefore not very satisfactory.

De plus l'utilisation de ces transformateurs dont la symétrie par rapport à la terre est généralement imparfaite, implique de plus l'adjonction de composants correctifs auxiliaires, notamment de selfs et de capacités de filtrage.In addition, the use of these transformers, the symmetry with respect to the earth of which is generally imperfect, also involves the addition of auxiliary corrective components, in particular chokes and filtering capacities.

La présente invention propose donc un transformateur symétrique pour équipement de transmission qui ne nécessite pas l'adjonction de composants correctifs supplémentaires pour assurer la transmission de données numériques sous forme impulsionnelle en différentiel en coopération avec une liaison constituée par une paire de fils et qui possède une isolation galvanique importante, malgré son faible volume.The present invention therefore provides a symmetrical transformer for transmission equipment which does not require the addition of additional corrective components to ensure the transmission of digital data in pulse differential form in cooperation with a link constituted by a pair of wires and which has a significant galvanic isolation, despite its small volume.

Ce transformateur symétrique est classiquement constitué d'une carcasse magnétique, d'un primaire à point milieu destiné à être relié à deux fils d'une liaison de transmission par ses extrémités, d'un secondaire destiné lui aussi à être relié à deux fils d'une seconde liaison de transmission par ses extrémités, ainsi que d'un écran électromagnétique intercalé entre primaire et secondaire et galvaniquement isolé de ce primaire et de ce secondaire.This symmetrical transformer conventionally consists of a magnetic carcass, a mid-point primary intended to be connected to two wires of a transmission link by its ends, a secondary also intended to be connected to two wires d 'a second transmission link by its ends, as well as an electromagnetic screen interposed between primary and secondary and galvanically isolated from this primary and this secondary.

Selon une caractéristique de l'invention, le primaire du transformateur est divisé, de manière égale, en deux enroulements concentriques, interconnectés, entre lesquels le secondaire est monté en sandwich et en ce que l'écran électromagnétique est scindé en deux éléments respectivement insérés chacun entre l'un des enroulements concentriques du primaire et le secondaire avec lesquels ces deux éléments sont coaxialement enroulés.According to a characteristic of the invention, the primary of the transformer is divided, equally, in two concentric windings, interconnected, between which the secondary is sandwiched and in that the electromagnetic screen is split into two elements respectively inserted each between one of the concentric windings of the primary and the secondary with which these two elements are coaxially wound.

L'invention, ses caractéristiques et ses avantages sont précisés dans la description qui suit, en liaison avec les figures répertoriées ci-dessous.

  • La figure 1 présente un schéma électrique de principe d'un transformateur pour équipement de transmission.
  • La figure 2 présente un schéma électrique de principe d'un transformateur selon l'invention.
  • La figure 3 présente un schéma partiel détaillé du transformateur schématisé sur la figure 2.
The invention, its characteristics and its advantages are explained in the following description, in conjunction with the figures listed below.
  • Figure 1 shows a schematic electrical diagram of a transformer for transmission equipment.
  • FIG. 2 shows an electrical schematic diagram of a transformer according to the invention.
  • FIG. 3 presents a detailed partial diagram of the transformer shown diagrammatically in FIG. 2.

Le transformateur pour équipement de transmission présenté figure 1 est de manière classique constitué d'une carcasse magnétique non représentée, d'un primaire 1 à point milieu PM destiné à être relié à deux fils d'une liaison de transmission par ses extrémités P1 et P2, d'un secondaire destiné lui aussi à être relié à deux fils d'une seconde liaison de transmission par ses extrémités S1 et S2, ainsi que d'un écran électromagnétique 3 intercalé entre primaire 1 et secondaire 2..The transformer for transmission equipment presented in FIG. 1 is conventionally made up of a magnetic carcass not shown, of a primary 1 with a mid-point PM intended to be connected to two wires of a transmission link by its ends P1 and P2 , a secondary also intended to be connected to two wires of a second transmission link by its ends S1 and S2, as well as an electromagnetic screen 3 interposed between primary 1 and secondary 2 ..

Un tel transformateur est classiquement exploité pour la transmission de signaux de type au moins grossièrement alternatifs, il est mal adapté à la transmission de signaux impulsionnels à haut débit tels que ceux susceptibles d'être transmis par une interface S de réseau numérique à intégration de services, pour les raisons évoquées plus haut.Such a transformer is conventionally used for the transmission of signals of at least roughly alternative type, it is ill-suited to the transmission of high-speed pulse signals such as those capable of being transmitted by an interface S of a digital network with service integration. , for the reasons mentioned above.

Le primaire 1 du transformateur selon l'invention, tel que schématisé figure 2, comporte deux enroulements 10 et 11, quasiment identiques et physiquement distincts, il en est éventuellement de même pour le secondaire 2 qui est alors constitué d'un ou d'ici deux enroulements théoriquement identiques 20 et 21, l'ensemble est agencé de manière que à présenter une symétrie la plus parfaite possible, tant au point de vue des capacités parasites que des résistances.The primary 1 of the transformer according to the invention, as shown schematically in Figure 2, has two windings 10 and 11, almost identical and physically distinct, it is possibly the same for secondary 2 which then consists of one or from here two theoretically identical windings 20 and 21, the assembly is arranged so as to have the most perfect symmetry possible, both from the point of view of stray capacitances and resistances.

Ceci est obtenu par réalisation, d'un assemblage en sandwich du ou des enroulements secondaires du transformateur entre les deux enroulements primaires autour du noyau 4 de la carcasse magnétique du transformateur, ainsi qu'on le voit sur la demi-coupe selon l'axe du noyau et des enroulements 10, 11, 20, 21 qui est présentée en figure 3.This is obtained by making a sandwich assembly of the secondary winding (s) of the transformer between the two primary windings around the core 4 of the magnetic carcass of the transformer, as can be seen on the half-section along the axis. of the core and the windings 10, 11, 20, 21 which is presented in FIG. 3.

Le positionnement du secondaire entre les deux enroulements 10 et 11 du primaire permet d'obtenir une self de fuite faible.The positioning of the secondary between the two windings 10 and 11 of the primary makes it possible to obtain a low leakage self.

La limitation du nombre de couches de fils composant les bobinages formant les enroulements permet d'obtenir une distance intercouche très grande et des capacités parasites faibles entre enroulements, tant au primaire qu'au secondaire.The limitation of the number of layers of wires making up the windings forming the windings makes it possible to obtain a very large interlayer distance and low parasitic capacitances between windings, both in primary and in secondary.

Dans un objectif de bonne reproductibilité industrielle, les nombres de spires des couches de chaque bobinage sont choisis pour correspondre à des nombres entiers de couches.In an objective of good industrial reproducibility, the numbers of turns of the layers of each winding are chosen to correspond to whole numbers of layers.

L'équilibrage entre résistances des enroulements 10 et 11 du primaire est obtenu par modification du diamètre des fils composant ces enroulements, le fil de l'enroulement 11, bobiné le plus à l'extérieur par rapport au noyau 4, étant choisi plus gros que celui de l'enroulement 10 qu'il entoure, afin de compenser les différences de longueur.Balancing between the resistances of the windings 10 and 11 of the primary is obtained by modifying the diameter of the wires making up these windings, the wire of the winding 11, wound more outwardly relative to the core 4, being chosen larger than that of the winding 10 which it surrounds, in order to compensate for the differences in length.

Dans un exemple de réalisation, l'enroulement 10 comporte 32 spires d'un fil de diamètre de 0,14 mm alors que l'enroulement 11, à l'intérieur duquel il se trouve, comporte 32 spires de 0,18 mm, l'un et l'autre étant extérieurement recouverts d'une couche isolante 50, par exemple une couche de ruban isolant, telle 50 pour l'enroulement 10 et 51 pour l'enroulement 11.In an exemplary embodiment, the winding 10 has 32 turns of a wire with a diameter of 0.14 mm while the winding 11, inside which it is located, has 32 turns of 0.18 mm, l one and the other being externally covered with an insulating layer 50, for example a layer of insulating tape, such as 50 for the winding 10 and 51 for the winding 11.

Ceci permet donc de symétriser le transformateur par rapport à la terre à laquelle il est usuellement connecté et de réduire le taux de conversion longitudinale d'un terminal supposé venir se raccorder aux bornes S1, S2 du secondaire 2.This therefore makes it possible to symmetrize the transformer with respect to the earth to which it is usually connected and to reduce the longitudinal conversion rate of a terminal assumed to be connected to the terminals S1, S2 of secondary 2.

Pour obtenir une bonne compatibilité électromagnétique en tension de mode commun et à symétriser le transformateur en capacité par rapport à la terre, la capacité parasite entre l'écran et le primaire est privilégiée par rapport à la capacité entre cet écran et le secondaire.To obtain good electromagnetic compatibility in common mode voltage and to symmetrize the transformer in capacity with respect to earth, the parasitic capacity between the screen and the primary is favored compared to the capacity between this screen and the secondary.

De même la capacité parasite du secondaire 2 doit être limitée au maximum d'autant plus que ce secondaire doit le plus souvent être réalisé en deux enroulements concentriques 20 et 21 vu le nombre de spires et la hauteur minimale de bobinage souhaités.Similarly, the parasitic capacity of the secondary 2 must be limited to the maximum all the more since this secondary must most often be produced in two concentric windings 20 and 21 given the number of turns and the minimum desired winding height.

Une couche isolante 53 est donc prévue pour réduire au maximum la capacité parasite entre les enroulements secondaires 20 et 21.An insulating layer 53 is therefore provided to minimize the parasitic capacitance between the secondary windings 20 and 21.

Or ces capacités dépendent notamment de l'épaisseur des couches isolantes séparant les parties conductrices formant électrodes.However, these capacities depend in particular on the thickness of the insulating layers separating the conductive parts forming electrodes.

Dans la réalisation proposée, l'écran 3 est réalisé en deux éléments 30 et 31 interconnectés qui sont individuellement insérés chacun entre l'un des enroulements primaires 10, 11 et l'un des enroulements secondaires 20, 21.In the proposed embodiment, the screen 3 is made of two interconnected elements 30 and 31 which are individually inserted each between one of the primary windings 10, 11 and one of the secondary windings 20, 21.

L'élément d'écran 30 est constitué d'une couche conductrice par exemple en cuivre qui est extérieurement enroulée sur la couche isolante 50, cette dernière recouvre elle-même l'enroulement primaire intérieur 10. Une couche isolante 52 est à son tour enroulée extérieurement sur l'élément d'écran 30, elle est ici constituée avec le même matériau isolant en ruban que la couche 50, mais sous une épaisseur double.The screen element 30 consists of a conductive layer for example of copper which is externally wound on the insulating layer 50, the latter itself covers the internal primary winding 10. An insulating layer 52 is in turn wound externally on the screen element 30, it is here constituted with the same insulating tape material as the layer 50, but under a double thickness.

Une couche isolante 53 identique à la couche 52 est enroulée sur l'enroulement secondaire 20 pour le séparer de l'enroulement 21 à l'intérieur de l'ensemble bobiné à l'intérieur de la carcasse non représentée du transformateur dont ils font partie, étant entendu que ces enroulements secondaires sont électriquement raccordés, ici à l'intérieur de l' ensemble bobiné.An insulating layer 53 identical to the layer 52 is wound on the secondary winding 20 to separate it from the winding 21 inside the assembly wound inside the carcass, not shown, of the transformer of which they are a part, it being understood that these secondary windings are electrically connected, here inside the wound assembly.

Deux couches isolantes 54 et 55 sont enroulées de part et d'autre du second élément d'écran 31, elles sont respectivement de même nature et de mêmes épaisseurs que les couches isolantes 52 et 50 auxquelles elles correspondent respectivement.Two insulating layers 54 and 55 are wound on either side of the second screen element 31, they are respectively of the same nature and of the same thickness as the insulating layers 52 and 50 to which they correspond respectively.

L'enroulement secondaire extérieur 21 est donc séparé de l'élément d'écran 31 par une épaisseur d'isolant double de celle qui sépare ce dernier de l'enroulement secondaire 11 sur lequel l'un et l'autre sont enroulés le premier nommé sur le second nommé.The external secondary winding 21 is therefore separated from the screen element 31 by a thickness of insulation twice that which separates the latter from the secondary winding 11 on which both are wound the first named on the second named.

De même l'épaisseur de la couche isolante 53 entre enroulements secondaires 20 et 21 est choisie égale à celle des couches 54 et 52 diminuant en conséquence la capacité entre ces enroulements et la capacité vue du primaire correspondante.Similarly, the thickness of the insulating layer 53 between the secondary windings 20 and 21 is chosen to be equal to that of the layers 54 and 52 consequently reducing the capacity between these windings and the capacity seen from the corresponding primary.

La capacité parasite du secondaire du transformateur est donc diminuée et le primaire est donc moins sensible à l'influence de ce secondaire et plus sensible aux effets des écrans 30 et 31, ce qui facilite son équilibrage par rapport à la terre.The parasitic capacity of the secondary of the transformer is therefore reduced and the primary is therefore less sensitive to the influence of this secondary and more sensitive to the effects of screens 30 and 31, which facilitates its balancing with respect to earth.

Une rigidité diélectrique importante, par exemple supérieure à 1,5 kV eff, entre primaire et secondaire est simultanément susceptible d'être obtenue, elle est ici renforcée aux niveaux des bornes d'extrémité des enroulements P1, P2, S1, S2 qui sont classiquement assemblées à très courte distance, par recouvrement des picots constituant ces bornes par une goutte en matériau durcissant de haute rigidité diélectrique.A significant dielectric strength, for example greater than 1.5 kV rms, between primary and secondary is simultaneously capable of being obtained, it is here reinforced at the end terminals of the windings P1, P2, S1, S2 which are conventionally assembled at very short distance, by covering the pins constituting these terminals by a drop of hardening material of high dielectric strength.

Claims (4)

1. Transformateur symétrique pour équipement de transmission constitué d'une carcasse magnétique,non représentée, d'un primaire (1) à point milieu (PM) destiné à être relié à deux fils d'une liaison de transmission par ses extrémités (P1 et P2), d'un secondaire (2) destiné lui aussi à être relié à deux fils d'une seconde liaison de transmission par ses extrémités (S1 et S2), ainsi que d'un écran électromagnétique (3) intercalé entre primaire et secondaire et galvaniquement isolé de ce primaire et de ce secondaire, caractérisé en ce que le primaire (1) du transformateur est divisé, de manière égale, en deux enroulements concentriques interconnectés (10, 11) entre lesquels le secondaire (2) est monté en sandwich et en ce que l'écran électromagnétique (3) est scindé en deux éléments (30, 31) respectivement insérés chacun entre l'un des enroulements concentriques du primaire et le secondaire avec lesquels ces deux éléments sont coaxialement enroulés.1. Symmetrical transformer for transmission equipment consisting of a magnetic carcass, not shown, of a primary (1) with mid-point (PM) intended to be connected to two wires of a transmission link by its ends (P1 and P2), a secondary (2) also intended to be connected to two wires of a second transmission link by its ends (S1 and S2), as well as an electromagnetic screen (3) interposed between primary and secondary and galvanically isolated from this primary and from this secondary, characterized in that the primary (1) of the transformer is divided, equally, in two interconnected concentric windings (10, 11) between which the secondary (2) is sandwiched and in that the electromagnetic screen (3) is split into two elements (30, 31) respectively inserted each between one of the concentric windings of the primary and the secondary with which these two elements are coaxially wound. 2. Transformateur symétrique selon la revendication 1, caractérisé en ce que les deux enroulements primaires (10,11), qui comportent un même nombre de spires et un nombre réduit de couches, ont une même résistance, le fil conducteur choisi pour l'enroulement primaire (11) entourant l'autre ayant un diamètre supérieur au fil choisi pour cet autre enroulement primaire (10).2. Symmetrical transformer according to claim 1, characterized in that the two primary windings (10,11), which have the same number of turns and a reduced number of layers, have the same resistance, the conductive wire chosen for the winding primary (11) surrounding the other having a diameter greater than the wire chosen for this other primary winding (10). 3. Transformateur symétrique selon la revendication 1, caractérisé en ce que l'isolement électrique entre chacun des deux éléments interconnectés d'écran (30, 31) et d'une part un enroulement primaire (10 ou 11) et d'autre part le secondaire, éventuellement composé lui aussi de deux enroulements concentriques interconnectés (20, 21), est réalisé à l'aide d'un même matériau isolant, l'épaisseur de la couche (52 ou 54) de matériau isolant entre le secondaire et chacun des éléments d'écran (30 ou 31) étant supérieure à celle (50 ou 55) séparant un enroulement primaire (10 ou 11) de l'élément d'écran voisin (30 ou 31).3. Symmetrical transformer according to claim 1, characterized in that the electrical isolation between each of the two interconnected screen elements (30, 31) and on the one hand a primary winding (10 or 11) and on the other hand the secondary, possibly also composed of two interconnected concentric windings (20, 21), is produced using the same insulating material, the thickness of the layer (52 or 54) of insulating material between the secondary and each of the screen elements (30 or 31) being greater than that (50 or 55) separating a primary winding (10 or 11) from the neighboring screen element (30 or 31). 4. Transformateur symétrique selon la revendication 3, caractérisé en ce que l'isolement électrique entre chacun des deux enroulements secondaires (20, 21) est réalisé par une couche (53) de même épaisseur que celles (52, 54) isolant chaque enroulement secondaire de l'élément d'écran (30 ou 31) qu'il jouxte.4. Symmetrical transformer according to claim 3, characterized in that the electrical isolation between each of the two secondary windings (20, 21) is achieved by a layer (53) of the same thickness as those (52, 54) insulating each secondary winding of the screen element (30 or 31) which it adjoins.
EP19910110395 1990-06-29 1991-06-24 Symmetric transformer for transmission equipment Withdrawn EP0464569A1 (en)

Applications Claiming Priority (2)

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FR9008259A FR2664088A1 (en) 1990-06-29 1990-06-29 SYMMETRIC TRANSFORMER FOR TRANSMISSION EQUIPMENT.
FR9008259 1990-06-29

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EP0464569A1 true EP0464569A1 (en) 1992-01-08

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EP19910110395 Withdrawn EP0464569A1 (en) 1990-06-29 1991-06-24 Symmetric transformer for transmission equipment

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EP (1) EP0464569A1 (en)
FR (1) FR2664088A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690625A1 (en) * 1994-06-29 1996-01-03 AT&T Corp. Circuit for broadband video transmission over unshielded twisted wire pairs
FR2732529A1 (en) * 1995-03-27 1996-10-04 Reltek Communications Frequency multiplexed signal transmission system esp. for apartments
FR3002385A1 (en) * 2013-02-20 2014-08-22 Jacques Louis Marie Pontois Differential mode port power summation/division device for high frequency/very high frequency radio frequency multi-channel receiver, has load resistances for correcting losses of adaptability

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128604A1 (en) * 1971-03-04 1972-10-20 Siemens Ag
US4518941A (en) * 1983-11-16 1985-05-21 Nihon Kohden Corporation Pulse transformer for switching power supplies
DE3533649A1 (en) * 1985-09-20 1987-04-02 Siemens Ag Transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2128604A1 (en) * 1971-03-04 1972-10-20 Siemens Ag
US4518941A (en) * 1983-11-16 1985-05-21 Nihon Kohden Corporation Pulse transformer for switching power supplies
DE3533649A1 (en) * 1985-09-20 1987-04-02 Siemens Ag Transformer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0690625A1 (en) * 1994-06-29 1996-01-03 AT&T Corp. Circuit for broadband video transmission over unshielded twisted wire pairs
FR2732529A1 (en) * 1995-03-27 1996-10-04 Reltek Communications Frequency multiplexed signal transmission system esp. for apartments
FR3002385A1 (en) * 2013-02-20 2014-08-22 Jacques Louis Marie Pontois Differential mode port power summation/division device for high frequency/very high frequency radio frequency multi-channel receiver, has load resistances for correcting losses of adaptability

Also Published As

Publication number Publication date
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