EP0070752B1 - Security transformer with concentric windings - Google Patents

Security transformer with concentric windings Download PDF

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Publication number
EP0070752B1
EP0070752B1 EP19820401181 EP82401181A EP0070752B1 EP 0070752 B1 EP0070752 B1 EP 0070752B1 EP 19820401181 EP19820401181 EP 19820401181 EP 82401181 A EP82401181 A EP 82401181A EP 0070752 B1 EP0070752 B1 EP 0070752B1
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EP
European Patent Office
Prior art keywords
winding
transformer according
abutment
groove
transformer
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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
Application number
EP19820401181
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German (de)
French (fr)
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EP0070752A1 (en
Inventor
Daniel Grandjean
Alain Bouillot
Alain Barraux
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Orega Electronique et Mecanique
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Orega Electronique et Mecanique
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Publication of EP0070752A1 publication Critical patent/EP0070752A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • 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
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • 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

Definitions

  • the invention relates to a safety transformer with concentric windings.
  • a transformer comprises a magnetic circuit around a branch of which is disposed a carcass on which are wound primary and secondary windings formed of conducting wires which, for reasons of economy, are not usually insulated.
  • the invention relates in particular to a transformer whose primary is supplied with alternating current by the distribution network, for example at the voltage of 220 volts.
  • Such a transformer must comply with strict rules in order to eliminate the risk of electric shock to users.
  • a winding for example the secondary
  • the carcass is in one piece.
  • the latter has for this purpose a first cylindrical part around which is wound the internal winding, the primary in the example, and which ends, at each of its axial ends, by cylindrical parts of larger section forming supports for an insulating sheet surrounding the primary and around which the secondary is wound.
  • the conductors connecting the primary to the supply terminals pass through a cylindrical end part.
  • this connection must comply with certain rules. According to one of these rules (standard IEC 65 of the International Electronic Commission) the minimum distance between uninsulated conductors of primary and secondary must be equal to 6 mm.
  • the invention on the contrary avoids manual intervention.
  • the transformer according to the invention is a safety transformer whose first winding is inside a second winding and whose carcass in one piece has a first cylindrical part around which the internal winding is wound and which is extended, at each axial end, by cylindrical parts of larger section forming supports for an insulating sheet surrounding the internal winding and around which the external winding is wound, the non-insulated conductors connecting the winding internal through a cylindrical end part, characterized in that grooves are formed in a cylindrical end part, these grooves extending in a spiral path extending the spiral of the internal winding, and in that means are provided to apply these non-insulated conductors in the bottom of the grooves.
  • a stop for this conductor which is a short distance from said bottom of the groove. This stop is for example outside the groove.
  • connection of the internal winding to external conductors can be carried out automatically, like the winding of this winding.
  • the safety transformer shown in the figures includes a primary winding 10 ( Figure 5) connected to terminals 11 and 12 intended to be supplied by the mains (generally 220 volts, 50 Hz) as well as two secondary windings 13 and 14.
  • the ends of the winding 13 are connected to terminals 15 and 16 respectively.
  • This secondary winding 13 also comprises a central socket 17 connected to a use terminal 18.
  • the second secondary winding 14 has its ends connected to terminals 19 and 20 and an intermediate socket 21 is connected to a terminal 22.
  • This transformer comprises a carcass 23 molded from an insulating plastic material on which are wound the primary 10 and secondary windings 13 and 14 and which carries metal pins constituting the terminals, respectively 11, 12, 15, 16, 18, 19, 20 and 22.
  • This carcass has a central opening 24 in the shape of a rectangular parallelepiped through which a branch of the magnetic circuit (not shown) of the transformer.
  • the external surface of the carcass 23 comprises a first cylindrical part 25 of rectangular section around which the primary winding 10 is wound and which is extended, at each of its axial ends, by cylindrical surfaces 26 and 27 of the same axis 28 and of rectangular section but with a greater width and a greater length than the corresponding section of the surface 25.
  • the free ends of the surfaces 26 and 27 end in flanges or flanges, respectively 29 and 30, perpendicular to the axis 28.
  • An insulating sheet 31 rests on the surfaces 26 and 27 and encloses the primary winding 10. It is on this insulating sheet 31 which the secondary windings 13 and 14 are wound. Thus the accommodation of the secondary windings is limited, from on the one hand, by the insulating sheet 31 and, on the other hand, by the flanges 29 and 30.
  • the carcass 23 also comprises a plate 32, the internal face 33 of which is coplanar with one of the four planes delimiting the opening 24 and which projects in an axial direction from the side of the rim 29, of the coil supporting the primary and secondary windings .
  • This plate 32 is, in its upper part, bristling with supports 34 presenting the housings for the pins 15, 16, 18, 19, 20 and 22.
  • each groove is directed towards a corresponding spike support constituting the output terminal.
  • the groove 44 is directed towards the support 36 2 of the pin 12 and the groove 41 is directed towards the support 36 1 of the pin 11.
  • Each groove follows a spiral path continuing the spiral path of the conductors of the winding 10 around the surface 25.
  • each groove is on the same cylindrical surface as the bottom 25 of the housing of the winding 10.
  • Each of these grooves opens out above the plate 35 whose upper face 46 (FIG. 2) is coplanar with a plane of the surface 25.
  • each support 36 has, on a vertical side, a projection 50 of which the lower face 51 (FIG. 3), facing the face 46 of the plate 35, is a short distance from this face 46 and forms an acute angle with the face 52 of the support 36 to which it is attached.
  • the conductor 53 leaving a groove, for example that of reference 44, is applied against the face 51 of the projection in the vicinity of the apex 55 of the acute angle and then goes along the support 36 before being wound around the corresponding pin 12.
  • connection conductors 53 are, as a result of this arrangement, brought as close as possible to the plane 46 and, therefore, as far as possible from the bare conductors of the secondary winding, the IEC 65 standard mentioned above can be observed and the connection primary winding can be performed automatically because the connecting wires pass through grooves without crossing a hole as in transformers of the same kind previously known.
  • the grooves 42 and 43 converge on the same support 36 3 ( Figure 1) which has a pin 60 on which two conductors can be wound.
  • the support 36 3 has on each of its sides projections 50 3 and 50 4 for guiding the conductors so that they remain as close as possible to the surface 46.
  • the plate 35 has edges 65 and 66 which are perpendicular thereto and are arranged in a rectilinear alignment with the pins 11, 12 and 60 which they are intended to protect.
  • the plate 32 has edges 67 and 68 arranged in locations constituting a straight alignment with the pins 15, 16, 18, 19, 20 and 22 and ensuring the protection of these pins.

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

Description

L'invention est relative à un transformateur de sécurité à enroulements concentriques.The invention relates to a safety transformer with concentric windings.

On sait qu'un transformateur comprend un circuit magnétique autour d'une branche duquel est disposée une carcasse sur laquelle sont bobinés des enroulements primaire et secondaire formés de fils conducteurs qui, pour des raisons d'économie, ne sont habituellement pas isolés.It is known that a transformer comprises a magnetic circuit around a branch of which is disposed a carcass on which are wound primary and secondary windings formed of conducting wires which, for reasons of economy, are not usually insulated.

L'invention vise en particulier un transformateur dont le primaire est alimenté en courant alternatif par le réseau de distribution, par exemple à la tension de 220 volts.The invention relates in particular to a transformer whose primary is supplied with alternating current by the distribution network, for example at the voltage of 220 volts.

Un tel transformateur doit se conformer à des règles strictes afin d'éliminer les risques d'électrocution des utilisateurs.Such a transformer must comply with strict rules in order to eliminate the risk of electric shock to users.

Dans un transformateur utilisé couramment un enroulement, par exemple le secondaire, est disposé autour de l'autre enroulement et la carcasse est d'un seul tenant. Cette dernière présente à cet effet une première partie cylindrique autour de laquelle est bobinée l'enroulement interne, le primaire dans l'exemple, et qui se termine, à chacune de ses extrémités axiales, par des parties cylindriques de plus grande section formant des appuis pour une feuille isolante entourant le primaire et autour de laquelle est bobiné le secondaire. Les conducteurs de raccordement du primaire aux bornes d'alimentation traversent une partie cylindrique d'extrémité. Mais, pour assurer la sécurité d'utilisation du transformateur, ce raccordement doit se conformer à certaines règles. Selon l'une de ces règles (norme CEI 65 de la Commission Electronique Internationale) la distance minimum entre les conducteurs non isolés des primaire et secondaire doit être égale à 6 mm. Jusqu'à présent, pour respecter cette dernière condition, on isole les conducteurs d'alimentation du primaire sur une distance suffisante en les entourant d'une gaine isolante. Une autre solution consiste à faire passer ces conducteurs à travers des trous ou fentes (Brevet français 1 595 005) des faces d'extrémité de la carcasse qui sont disposés de façon telle que ces conducteurs d'alimentation restent à distance suffisante des conducteurs non isolés de l'enroulement secondaire.In a transformer commonly used a winding, for example the secondary, is arranged around the other winding and the carcass is in one piece. The latter has for this purpose a first cylindrical part around which is wound the internal winding, the primary in the example, and which ends, at each of its axial ends, by cylindrical parts of larger section forming supports for an insulating sheet surrounding the primary and around which the secondary is wound. The conductors connecting the primary to the supply terminals pass through a cylindrical end part. However, to ensure the safe use of the transformer, this connection must comply with certain rules. According to one of these rules (standard IEC 65 of the International Electronic Commission) the minimum distance between uninsulated conductors of primary and secondary must be equal to 6 mm. Until now, to respect this last condition, the primary supply conductors are isolated over a sufficient distance by surrounding them with an insulating sheath. Another solution consists in passing these conductors through holes or slots (French patent 1,595,005) of the end faces of the carcass which are arranged in such a way that these supply conductors remain at a sufficient distance from the non-insulated conductors. secondary winding.

Mais ces solutions connues nécessitent, au cours de la fabrication d'un transformateur, une intervention manuelle défavorable à la fabrication en grande série.However, these known solutions require, during the manufacture of a transformer, manual intervention unfavorable to mass production.

L'invention évite au contraire l'intervention manuelle.The invention on the contrary avoids manual intervention.

Le transformateur selon l'invention est un transformateur de sécurité dont un premier enroulement est à l'intérieur d'un second enroulement et dont la carcasse d'un seul tenant présente une première partie cylindrique autour de laquelle est bobiné l'enroulement interne et qui est prolongée, à chacune des extrémités axiales, par des parties cylindriques de plus grande section formant des appuis pour une feuille isolante entourant l'enroulement interne et autour de laquelle est bobiné l'enroulement externe, les conducteurs non isolés de raccordement de l'enroulement interne traversant une partie cylindrique d'extrémité, caractérisé en ce que des gorges sont ménagées dans une partie cylindrique d'extrémité, ces gorges s'étendant suivant un parcours en spirale prolongeant la spirale de l'enroulement interne, et en ce que des moyens sont prévus pour appliquer ces conducteurs non isolés dans les fonds des gorges.The transformer according to the invention is a safety transformer whose first winding is inside a second winding and whose carcass in one piece has a first cylindrical part around which the internal winding is wound and which is extended, at each axial end, by cylindrical parts of larger section forming supports for an insulating sheet surrounding the internal winding and around which the external winding is wound, the non-insulated conductors connecting the winding internal through a cylindrical end part, characterized in that grooves are formed in a cylindrical end part, these grooves extending in a spiral path extending the spiral of the internal winding, and in that means are provided to apply these non-insulated conductors in the bottom of the grooves.

Pour maintenir le conducteur au fond de la gorge, dans une réalisation, on prévoit, au voisinage de la sortie de cette gorge, une butée pour ce conducteur qui est à courte distance dudit fond de la gorge. Cette butée est par exemple à l'extérieur de la gorge.To maintain the conductor at the bottom of the groove, in one embodiment, there is provided, in the vicinity of the exit from this groove, a stop for this conductor which is a short distance from said bottom of the groove. This stop is for example outside the groove.

Ainsi le raccordement de l'enroulement interne à des conducteurs extérieurs peut être effectué de façon automatique, comme le bobinage de cet enroulement.Thus the connection of the internal winding to external conductors can be carried out automatically, like the winding of this winding.

D'autres caractéristiques et avantages de l'invention apparaîtront avec la description de l'un de ses modes de réalisation, celle-ci étant effectuée en se référant aux dessins ci-annexés sur lesquels:

  • - la figure 1 est une vue de dessus d'une carcasse de transformateur selon l'invention avec les enroulements primaire et secondaire représentés de façon schématique,
  • - la figure 2 est, dans sa partie gauche, une demie-vue selon la flèche f de la figure 1 et, dans sa partie droite, une coupe selon la ligne 2-2 de la figure 1,
  • - la figure 3 est dans sa partie gauche une demie vue selon la flèche f' de la figure 1 et dans sa partie droite une demie-coupe selon la ligne 3-3 de ladite figure 1,
  • - la figure 4 est une vue partielle en perspective de la carcasse d'un transformateur selon l'invention avec son enroulement primaire, et
  • - la figure 5 est un schéma électrique du transformateur.
Other characteristics and advantages of the invention will appear with the description of one of its embodiments, this being carried out with reference to the attached drawings in which:
  • FIG. 1 is a top view of a transformer carcass according to the invention with the primary and secondary windings shown diagrammatically,
  • FIG. 2 is, in its left part, a half view along the arrow f in FIG. 1 and, in its right part, a section along line 2-2 of FIG. 1,
  • FIG. 3 is in its left part a half view along the arrow f ′ in FIG. 1 and in its right part a half section along line 3-3 of said FIG. 1,
  • FIG. 4 is a partial perspective view of the carcass of a transformer according to the invention with its primary winding, and
  • - Figure 5 is an electrical diagram of the transformer.

Le transformateur de sécurité représenté sur les figures comprend un enroulement primaire 10 (figure 5) relié à des bornes 11 et 12 destinées à être alimentées par le secteur (en général 220 volts, 50 Hz) ainsi que deux enroulements secondaires 13 et 14. Les extrémités de l'enroulement 13 sont connectées à des bornes respectivement 15 et 16. Cet enroulement secondaire 13 comporte également une prise médiane 17 reliée à une borne d'utilisation 18. De même le second enroulement secondaire 14 a ses extrémités reliées à des bornes 19 et 20 et une prise intermédiaire 21 est reliée à une borne 22.The safety transformer shown in the figures includes a primary winding 10 (Figure 5) connected to terminals 11 and 12 intended to be supplied by the mains (generally 220 volts, 50 Hz) as well as two secondary windings 13 and 14. The ends of the winding 13 are connected to terminals 15 and 16 respectively. This secondary winding 13 also comprises a central socket 17 connected to a use terminal 18. Similarly the second secondary winding 14 has its ends connected to terminals 19 and 20 and an intermediate socket 21 is connected to a terminal 22.

Ce transformateur comporte une carcasse 23 moulée en une matière plastique isolante sur laquelle sont enroulés les bobinages primaire 10 et secondaires 13 et 14 et qui porte des picots métalliques constituant les bornes, respectivement 11, 12, 15, 16, 18, 19, 20 et 22. Cette carcasse présente une ouverture centrale 24 en forme de parallélépipède rectangle traversée par une branche du circuit magnétique (non représenté) du transformateur.This transformer comprises a carcass 23 molded from an insulating plastic material on which are wound the primary 10 and secondary windings 13 and 14 and which carries metal pins constituting the terminals, respectively 11, 12, 15, 16, 18, 19, 20 and 22. This carcass has a central opening 24 in the shape of a rectangular parallelepiped through which a branch of the magnetic circuit (not shown) of the transformer.

La surface externe de la carcasse 23 comprend une première partie 25 cylindrique de section rectangulaire autour de laquelle est bobiné l'enroulement primaire 10 et qui est prolongée, à chacune de ses extrémités axiales, par des surfaces 26 et 27 cylindriques de même axe 28 et de section rectangulaire mais avec une plus grande largeur et une plus grande longueur que la section correspondante de la surface 25. Ces surfaces 26 et 27, qui se trouvent sur un même cylindre (fictif) d'axe 28, s'étendent en direction axiale sur une longueur nettement moins importante que la longueur occupée par la surface 25.The external surface of the carcass 23 comprises a first cylindrical part 25 of rectangular section around which the primary winding 10 is wound and which is extended, at each of its axial ends, by cylindrical surfaces 26 and 27 of the same axis 28 and of rectangular section but with a greater width and a greater length than the corresponding section of the surface 25. These surfaces 26 and 27, which are on the same (fictitious) cylinder of axis 28, extend in the axial direction over a length significantly less than the length occupied by the surface 25.

Les extrémités libres des surfaces 26 et 27 se terminent par des rebords ou flasques, respectivement 29 et 30, perpendiculaires à l'axe 28.The free ends of the surfaces 26 and 27 end in flanges or flanges, respectively 29 and 30, perpendicular to the axis 28.

Une feuille isolante 31 s'appuie sur les surfaces 26 et 27 et enferme l'enroulement primaire 10. C'est sur cette feuille isolante 31 qui sont bobinés les enroulements secondaires 13 et 14. Ainsi le logement des enroulements secondaires est limité, d'une part, par la feuille isolante 31 et, d'autre part, par les rebords 29 et 30.An insulating sheet 31 rests on the surfaces 26 and 27 and encloses the primary winding 10. It is on this insulating sheet 31 which the secondary windings 13 and 14 are wound. Thus the accommodation of the secondary windings is limited, from on the one hand, by the insulating sheet 31 and, on the other hand, by the flanges 29 and 30.

La carcasse 23 comprend également un plateau 32 dont la face interne 33 est coplanaire à l'un des quatre plans délimitant l'ouverture 24 et qui est en saillie en direction axiale du côté du rebord 29, de la bobine supportant les enroulements primaire et secondaires. Ce plateau 32 est, dans sa partie supérieure, hérissé de supports 34 présentant les logements pour les picots 15, 16, 18, 19, 20 et 22.The carcass 23 also comprises a plate 32, the internal face 33 of which is coplanar with one of the four planes delimiting the opening 24 and which projects in an axial direction from the side of the rim 29, of the coil supporting the primary and secondary windings . This plate 32 is, in its upper part, bristling with supports 34 presenting the housings for the pins 15, 16, 18, 19, 20 and 22.

Du côté du rebord 30 on prévoit un autre plateau 35 coplanaire au plateau 32 et également hérissé de supports 36 logeant les picots 11 et 12.On the side of the rim 30, there is another plate 35 coplanar with the plate 32 and also bristling with supports 36 housing the pins 11 and 12.

Dans l'anneau 38 (figure 1) délimité par la surface 27, l'épaulement 39 entre les surfaces 25 et 27, un prolongement de la surface 25 et le plan de la surface interne 40 du rebord 30, sont ménagées des gorges 41, 42, 43 et 44 au fond desquelles sont appliqués les fils non isolés de connexion de l'enroulement primaire 10 aux picots. Chaque gorge est dirigée vers un support de picot correspondant constituant borne de sortie. Ainsi la gorge 44 est dirigée vers le support 362 du picot 12 et la gorge 41 est dirigée vers le support 361 du picot 11. Chaque gorge suit un parcours en spirale continuant le parcours en spirale des conducteurs de l'enroulement 10 autour de la surface 25.In the ring 38 (FIG. 1) delimited by the surface 27, the shoulder 39 between the surfaces 25 and 27, an extension of the surface 25 and the plane of the internal surface 40 of the rim 30, are provided with grooves 41, 42, 43 and 44 at the bottom of which are applied the non-insulated wires for connection of the primary winding 10 to the pins. Each groove is directed towards a corresponding spike support constituting the output terminal. Thus the groove 44 is directed towards the support 36 2 of the pin 12 and the groove 41 is directed towards the support 36 1 of the pin 11. Each groove follows a spiral path continuing the spiral path of the conductors of the winding 10 around the surface 25.

Le fond de chaque gorge est sur la même surface cylindrique que le fond 25 du logement de l'enroulement 10. Chacune de ces gorges débouche au-dessus du plateau 35 dont la face supérieure 46 (figure 2) est coplanaire à un plan de la surface 25.The bottom of each groove is on the same cylindrical surface as the bottom 25 of the housing of the winding 10. Each of these grooves opens out above the plate 35 whose upper face 46 (FIG. 2) is coplanar with a plane of the surface 25.

Pour que chaque conducteur de sortie non isolé reste appliqué dans le fond de la gorge correspondante et qu'à sa sortie de la gorge il reste dans le plan de la surface 46, chaque support 36 présente, sur un côté vertical, une saillie 50 dont la face inférieure 51 (figure 3), tournée vers la face 46 du plateau 35, est à faible distance de cette face 46 et forme un angle aigu avec la face 52 du support 36 à laquelle elle est attachée. Le conducteur 53 sortant d'une gorge, par exemple celle de référence 44, est appliqué contre la face 51 de la saillie au voisinage du sommet 55 de l'angle aigu et longe ensuite le support 36 avant d'être enroulé autour du picot correspondant 12.So that each uninsulated output conductor remains applied in the bottom of the corresponding groove and that at its exit from the groove it remains in the plane of the surface 46, each support 36 has, on a vertical side, a projection 50 of which the lower face 51 (FIG. 3), facing the face 46 of the plate 35, is a short distance from this face 46 and forms an acute angle with the face 52 of the support 36 to which it is attached. The conductor 53 leaving a groove, for example that of reference 44, is applied against the face 51 of the projection in the vicinity of the apex 55 of the acute angle and then goes along the support 36 before being wound around the corresponding pin 12.

Les conducteurs non isolés 53 de raccordement étant, grâce à cette disposition, rapprochés au maximum du plan 46 et, ainsi, éloignés au maximum des conducteurs nus de l'enroulement secondaire, la norme CEI 65 mentionnée ci- dessus peut être respectée et la connexion de l'enroulement primaire peut être effectuée de façon automatique car les fils de raccordement passent dans des gorges sans traverser de trou comme dans les transformateurs du même genre antérieurement connus.Since the non-insulated connection conductors 53 are, as a result of this arrangement, brought as close as possible to the plane 46 and, therefore, as far as possible from the bare conductors of the secondary winding, the IEC 65 standard mentioned above can be observed and the connection primary winding can be performed automatically because the connecting wires pass through grooves without crossing a hole as in transformers of the same kind previously known.

Les gorges 42 et 43 convergent vers le même support 363 (figure 1 ) qui présente un picot 60 sur lequel peuvent être enroulés deux conducteurs. Dans ce cas le support 363 présente sur chacun de ses côtés des saillies 503 et 504 pour le guidage des conducteurs afin qu'ils restent rapprochés au maximum de la surface 46.The grooves 42 and 43 converge on the same support 36 3 (Figure 1) which has a pin 60 on which two conductors can be wound. In this case, the support 36 3 has on each of its sides projections 50 3 and 50 4 for guiding the conductors so that they remain as close as possible to the surface 46.

Le plateau 35 présente des rebords 65 et 66 qui lui sont perpendiculaires et sont disposés selon un alignement rectiligne avec les picots 11, 12 et 60 qu'ils sont destinés à protéger.The plate 35 has edges 65 and 66 which are perpendicular thereto and are arranged in a rectilinear alignment with the pins 11, 12 and 60 which they are intended to protect.

De manière analogue le plateau 32 présente des rebords 67 et 68 disposés en des emplacements constituant un alignement rectiligne avec les picots 15, 16, 18, 19, 20 et 22 et assurant la protection de ces picots.Similarly, the plate 32 has edges 67 and 68 arranged in locations constituting a straight alignment with the pins 15, 16, 18, 19, 20 and 22 and ensuring the protection of these pins.

Claims (10)

1. Security transformer a first winding (10) of which is located within a second winding (13, 14) and the integral bobbin (23) of which has a cylindrical portion (25) about which the internal winding is wound and which is extended, at each of the axial ends, by cylindrical portions (26, 27) of larger section forming supports of an insulating foil (31) surrounding the internal winding and whereabout the external winding (13, 14) is wound, the non-insulated connection conductors (53) of the internal winding crossing a cylindrical end portion, characterized in that grooves (41, 42, 43, 44) are arranged within a cylindrical end portion, these grooves extending along a spiral path prolonging the spiral of the internal winding, and in that means are provided for applying these non-insulated conductors into the bottoms of the grooves.
2. Transformer according to claim 1, characterized in that the bottom of each groove lies on the same cylindrical surface as the bottom (25) of the space receiving the internal winding.
3. Transformer according to claims 1 or 2, characterized in that, in order to maintain the conductor against the bottom of the groove, an abutment (50) for the conductor is provided in the neighborhood of the outlet of this groove at a short distance from the bottom.
4. Transformer according to claim 3, characterized in that the abutment (50) is external to the groove.
5. Transformer according to claim 4, characterized in that the abutment is an integral part of the carrier (36) of the connector (12) whereto the connection conductor is connected.
6. Transformer according to any of claims 3 to 5, characterized in that the face of the abutment whereagainst the conductor is applied forms an acute angle with the face of the wall which is integral with said abutment.
7. Transformer according to any of the preceding claims, characterized in that the internal winding forms the primary.
8. Transformer according to any of the preceding claims, characterized in that the bobbin has the general shape of a rectangular parallelepiped and the carriers of the connection connectors are integral parts of a platform which is coplanar with a wall of the bottom of the space receiving the internal winding.
9. Transformer according to any of the preceding claims, characterized in that the bobbin is of molded plastics material.
10. Transformer according to any of the preceding claims, characterized in that, upon the crossing, the smallest distance between said conductors and the non-insulated conductors of the external winding is at least equal to 6 mm.
EP19820401181 1981-07-03 1982-06-25 Security transformer with concentric windings Expired EP0070752B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113155A FR2509085B1 (en) 1981-07-03 1981-07-03 SAFETY TRANSFORMER WITH CONCENTRIC WINDINGS
FR8113155 1981-07-03

Publications (2)

Publication Number Publication Date
EP0070752A1 EP0070752A1 (en) 1983-01-26
EP0070752B1 true EP0070752B1 (en) 1985-05-29

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EP19820401181 Expired EP0070752B1 (en) 1981-07-03 1982-06-25 Security transformer with concentric windings

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EP (1) EP0070752B1 (en)
JP (1) JPS5874026A (en)
FR (1) FR2509085B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH058665Y2 (en) * 1986-04-24 1993-03-04
US4745388A (en) * 1987-02-02 1988-05-17 American Telephone And Telegraph Company, At&T Bell Laboratories Transformer with wire lead isolation slots
GB2333646B (en) 1998-05-29 2000-01-12 Electronic Tech Transformer bobbin
ATE419630T1 (en) * 2006-03-06 2009-01-15 Siemens Ag METHOD FOR WINDING A COIL, A WINDING BODY AND A COIL
CN103236343A (en) * 2013-04-27 2013-08-07 昆山禾旺电子有限公司 Transformer

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE849142C (en) * 1949-09-23 1952-09-11 Wilhelm Schalttner Coil body for small magnet-electric machine
FR1379325A (en) * 1963-12-31 1964-11-20 Thomson Houston Comp Francaise Improvements to transformer coils
FR1595005A (en) * 1967-12-13 1970-06-08
DE1932174A1 (en) * 1969-06-25 1971-01-14 Adolf Faerber Transmission device with increased creepage distance between the active parts and the active and passive parts
DE2255307A1 (en) * 1972-11-11 1974-05-22 Licentia Gmbh COIL OR TRANSFORMER WITH AT LEAST TWO WINDINGS
JPS5230914B2 (en) * 1973-09-21 1977-08-11
DE2618138C3 (en) * 1976-04-26 1984-09-06 Schwabe GmbH & Co KG Elektrotechnische Fabrik, 7067 Urbach Insulating flange made of plastic for touch-safe chokes or transformers
FR2422236A1 (en) * 1978-04-05 1979-11-02 Jeumont Schneider High inter-winding isolation transformer framework - has one former sitting within side wall of second

Also Published As

Publication number Publication date
FR2509085B1 (en) 1986-01-17
JPS5874026A (en) 1983-05-04
FR2509085A1 (en) 1983-01-07
EP0070752A1 (en) 1983-01-26

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