EP0736228A1 - Power connection device - Google Patents

Power connection device

Info

Publication number
EP0736228A1
EP0736228A1 EP95935995A EP95935995A EP0736228A1 EP 0736228 A1 EP0736228 A1 EP 0736228A1 EP 95935995 A EP95935995 A EP 95935995A EP 95935995 A EP95935995 A EP 95935995A EP 0736228 A1 EP0736228 A1 EP 0736228A1
Authority
EP
European Patent Office
Prior art keywords
connection device
power connection
preload
male part
female part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95935995A
Other languages
German (de)
French (fr)
Other versions
EP0736228B1 (en
Inventor
Jean-Claude Vergne
Gilles Soulard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bull SAS
Original Assignee
Bull SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bull SAS filed Critical Bull SAS
Publication of EP0736228A1 publication Critical patent/EP0736228A1/en
Application granted granted Critical
Publication of EP0736228B1 publication Critical patent/EP0736228B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/193—Means for increasing contact pressure at the end of engagement of coupling part, e.g. zero insertion force or no friction
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials

Definitions

  • the present invention relates to a power connection device comprising on the one hand, a female part constructed around a multi-clamp of lyre-shaped section contained in and subject to an insulating support, the assembly being fixed inside 'a bay and being accessible only on one side, and on the other hand, a male part to be plugged into said female part by said accessible side, the male part being composed of a single thick blade.
  • one solution consists in using traditional female connections of elastic type, for example with a lyre-shaped section, in which male connections are inserted.
  • traditional female connections of elastic type for example with a lyre-shaped section, in which male connections are inserted.
  • it is then provided, for a good distribution of said currents, to connect in parallel a plurality of this type of female connections, it it is not surprising in this case to find around fifty such connections in parallel.
  • This solution however has real disadvantages because it is almost impossible to obtain on each elementary female connection a very low contact resistance taking into account the disparities due to manufacturing tolerances as well as differences in their elasticity, this implies a result of the different not negligible elementary contact resistances.
  • the object of the present invention is to remedy the various drawbacks of the various solutions of the known prior art and proposes a simple power connection device which is practical to implement and to use even if it is not allowed to access it. only on one side and which, once the connection has been made, has a considerably reduced contact resistance.
  • the power connection device mentioned in the preamble is remarkable in that, for the transfer of high intensity currents, the female part is composed of a thick and rigid multi-clamp in which is inserted, during the connection, the male part, the female part having a pinching zone and the male part having a thickness such that the insertion force is between 1.5 and 5 daN and the result of the contact resistances is less than 60 ⁇ .
  • the female part is composed of a thick and rigid multi-pliers which makes it possible to ensure that each of the pliers of the multi-pliers is applied with a constant and sufficiently intense pressure force on the thick blade.
  • single component of the male part to obtain a uniform distribution of the currents and to impose a minimum contact resistance while respecting a moderate insertion force during connection.
  • the thickness and rigidity of the multi-pliers imply a sufficiently high elastic limit so as not to generate deformation of the pliers and therefore maintain good reproducibility of the pressure forces exerted on the male part even after a large number of insertions.
  • Figure 1 gives an embodiment of the power connection device, the support, the female part and the male part being shown in section before insertion in Figure 1a, while Figure 1b shows the female part and the male part of Figure 1a in a front view after insertion.
  • FIG. 2 proposes a curve of variation of the contact resistance as a function of the tightening.
  • FIG. 3 proposes a curve of variation of the insertion force as a function of the tightening.
  • the power connection device 1 comprises, a female part 2 of lyre-shaped section contained in and subject to an insulating support 3, by means, for example, of a metal plate 4 bearing on the support 3 and fixed, along the axis XX ', by means of screws in part 2, the assembly being fixed inside a bay (not shown) and being accessible only on one side, by the front of the bay.
  • the female part 2 in this example, rests by means of two shoulders 5 in a housing formed in the support 3.
  • the metal plate 4 is itself connected to the cards or to the card tray to be supplied.
  • the power connection device 1 also includes a male part 6 to be plugged into the female part from the accessible side, this part 6 of the device 1 is made integral with the card or the power supply module 7 to be connected.
  • the female part is composed of a thick and rigid multi-clamp 2 (see FIG. 1b) into which is inserted, during connection, the male part composed of a single thick blade 6 (see FIG. 1 b), the female part having a pinching zone P and the male part having a thickness W such that the insertion force necessary to plug the blade 6 into the multi-clamp 2 is between 1.5 and 5 daN and that the resultant of the contact resistances is less than 60 ⁇ .
  • the multi-clamp 2 is made of a copper material such as beryllium bronze, then heat treated and finally covered with silver.
  • the heat treatment can thus consist of dissolving for one hour at a temperature of around 760 ° C, followed by tempering for three hours at a temperature of around 320 ° C, which allows '' obtain a Rockwell hardness 35-40 (320 HB + 10%).
  • the silver layer deposited has a thickness of the order of 10 microns.
  • the thick blade 6 composing the male part is made of copper, then is covered with silver.
  • the thickness of the silver plating is equivalent to that of the multi-pliers.
  • the thick blade 6 has a double bevel B at its insertion end.
  • the insertion of the thick blade in the multi-clamp is done in a blind manner inside the bay, this particularity of the blade thus advantageously makes it possible to facilitate a flexible insertion and without hard point.
  • each power connection device 1 is used to constitute a power supply connector and, remarkably, each power connection device further comprises, fixed on the insulating support 3, an elastic metallic contact 8 called preload, the preload contact corresponding to the ground potential being directly connected to the corresponding connection device via an electric wire 9, while the preload contact corresponding to the non-zero potential is provided with a shorter length (dotted on FIG. 1a) to that of the preload contact corresponding to the ground potential and is connected to the corresponding connection device through a resistor 10 of low value (dotted line in FIG. 1a), for example of the order of two ohms. In this way, it is avoided, during plugging in, any sudden drop in supply voltage which would be due to the natural phenomenon of charging the capacitors of the modules to be supplied.
  • the longest preload contact is the first applied to the blade connected to ground, which allows any residual or parasitic voltage present across the capacitors of the modules to be supplied to be discharged, then the second, shorter contact is in turn applied to the blade connected to the non-zero potential, which makes it possible to preload by limiting the current, thanks to the low value resistance, the capacitors of the modules to be supplied, at the time of the 'introduction, before the blades enter the multi-clamps. So when the blades come in genuinely in contact with the multi-clamps, said capacitors are already preloaded and a sudden drop in voltage is then avoided.
  • the preload contacts must be of sufficient length to allow this preload, for a given nominal plug-in speed. This characteristic is also very advantageous applied to redundant systems, because it allows the plugging in of a system to replace the faulty one without however disturbing or even requiring the removal of the power supply of the second which is currently operating.
  • the so-called precharge contacts are made of a copper material, then are covered with silver.
  • FIG. 2 is proposed the reading of a curve of variation of the contact resistance CR as a function of the tightening S, while it is proposed in FIG. 3, a curve of variation of the insertion force IF as a function of the tightening S.
  • These curves are representative of the average value of the results obtained on a set of samples by taking the tightening as variable, the tightening corresponding to the difference in dimension between the thickness W of the blade 6 and the nipping area P presented by the multipince 2. Blades of different thicknesses, increasing from 0.05mm to 0.05mm were used to carry out these measurements. It was found that the elastic limit of the multi-clamp was reached with a tightening of about 0.35 mm.
  • the power connection device is simple, practical to implement and to use even when access is only allowed on one side and, once the connection is made, presents a contact resistance very significantly reduced and therefore an efficient transfer of high intensity currents while allowing easy insertion. It allows, on the one hand, the connection of the output voltages of the plug-in power supplies, i.e. modules to be connected on the free access side and, on the other hand, the connection for the power supply logical power voltages of cards or card bins with a fixed structure in a bay, on the non-accessible side.

Landscapes

  • Connector Housings Or Holding Contact Members (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

A power connection device (1) comprising a socket portion (2) with a lyrate cross-section contained and held in an insulating holder (3) inside a bay so as to be accessible from one side only, as well as a plug portion (6) for insertion into the accessible side of the socket portion. The device is remarkable in that, to enable the transfer of strong currents, the socket portion consists of a thick rigid multiple clip (2) which, for connection, receives the inserted plug portion consisting of a single thick blade (6). The nip area (P) of the socket portion and the thickness (W) of the plug portion are such that the insertion force is of 1.5-5 daN, and the resultant of the contact resistances is lower than 60 νΦ.

Description

Dispositif de connexion de puissance.Power connection device.
La présente invention concerne un dispositif de connexion de puissance comportant d'une part, une partie femelle élaborée autour d'une multipince de section en forme de lyre contenue dans et assujettie à un support isolant, l'ensemble étant fixé à l'intérieur d'une baie et n'étant accessible que d'un seul côté, et d'autre part, une partie mâle à enficher dans ladite partie femelle par ledit côté accessible, la partie mâle étant composée d'une lame épaisse unique.The present invention relates to a power connection device comprising on the one hand, a female part constructed around a multi-clamp of lyre-shaped section contained in and subject to an insulating support, the assembly being fixed inside 'a bay and being accessible only on one side, and on the other hand, a male part to be plugged into said female part by said accessible side, the male part being composed of a single thick blade.
De manière générale, lorsqu'il est désiré réaliser une connexion de puissance, il doit être pris un certain nombre de précautions. Ainsi, il est essentiel de réduire le plus possible toute résistance de contact. Pour cela, de manière courante, les pièces en contact sont boulonnées entre elles. Cette technique est sûre mais peu pratique, surtout lorsque l'encombrement et/ou le volume laissé disponible dans une baie électronique rendent l'accès difficile et ceci particulièrement lorsque la connexion n'est accessible que d'un seul côté, ce qui oblige alors à des démontages longs et pénibles en cas de panne. Cet inconvénient est encore accentué lorsque, comme c'est le cas de plus en plus souvent, il est utilisé des systèmes redondants, l'alimentation de la baie devant généralement être coupée pour extraire le module défaillant et le remplacer par un module en état de marche, supprimant ainsi l'avantage d'utiliser pleinement la redondance dans un système.Generally, when it is desired to make a power connection, a number of precautions must be taken. Thus, it is essential to minimize any contact resistance. For this, commonly, the parts in contact are bolted together. This technique is safe but impractical, especially when the space and / or the volume left available in an electronic bay make access difficult and this particularly when the connection is accessible only from one side, which then requires long and painful dismantling in the event of a breakdown. This drawback is further accentuated when, as is more and more the case, redundant systems are used, the supply to the bay generally having to be cut to extract the faulty module and replace it with a module in working order. works, thereby removing the advantage of fully using redundancy in a system.
Pour parer à cet inconvénient, à la place de liaisons boulonnées, une solution consiste à utiliser des connexions femelles traditionnelles de type élastique, par exemple à section en forme de lyre, dans lesquelles sont enfichées des connexions mâles. Pour permettre le transfert de puissance, en particulier pour des courants de haute intensité, étant donné la minceur de ces connexions, il est alors prévu, pour une bonne répartition desdits courants, de connecter en parallèle une pluralité de ce type de connexions femelles, il n'est pas surprenant dans ce cas de trouver une cinquantaine de telles connexions en parallèle. Cette solution présente cependant de réels inconvénients car il est quasiment impossible d'obtenir sur chaque connexion femelle élémentaire une très faible résistance de contact compte tenu des disparités dues aux tolérances de fabrication ainsi qu'aux différences dans leur élasticité, ceci implique une résultante des différentes résistances de contact élémentaires non négligeable. Une autre solution consiste à utiliser une barrette de connexion suffisament large pour supporter une forte intensité et suffisament rigide pour diminuer la résistance de contact. L'expérience montre cependant que le contact ne peut se faire de manière répartie sur l'intégralité de la largeur de ladite barrette, ceci a pour inconvénient d'augmenter significativement la résistance de contact, ce qui est contraire à l'objet recherché. En outre, du fait de la largeur et de la rigidité de la barrette, s'il est désiré réduire encore la résistance de contact en augmentant le pincement, la force d'insertion nécessaire pour l'enfichage de la pièce mâle devient véritablement excessive.To overcome this drawback, instead of bolted connections, one solution consists in using traditional female connections of elastic type, for example with a lyre-shaped section, in which male connections are inserted. To allow the transfer of power, in particular for high intensity currents, given the thinness of these connections, it is then provided, for a good distribution of said currents, to connect in parallel a plurality of this type of female connections, it it is not surprising in this case to find around fifty such connections in parallel. This solution however has real disadvantages because it is almost impossible to obtain on each elementary female connection a very low contact resistance taking into account the disparities due to manufacturing tolerances as well as differences in their elasticity, this implies a result of the different not negligible elementary contact resistances. Another solution consists in using a sufficiently wide connection strip to support a high intensity and sufficiently rigid to decrease the contact resistance. Experience shows, however, that contact cannot be made in a distributed manner over the entire width of said strip, this has the drawback of significantly increasing the contact resistance, which is contrary to the object sought. In addition, because of the width and the rigidity of the bar, if it is desired to further reduce the contact resistance by increasing the pinching, the insertion force necessary for plugging in the male part becomes truly excessive.
La présente invention a pour but de remédier aux divers inconvénients des différentes solutions de l'art antérieur connues et propose un dispositif de connexion de puissance simple, pratique à mettre en oeuvre et à utiliser même s'il n'est permis d'y accéder que d'un seul côté et qui, une fois la connexion réalisée, présente une résistance de contact considérablement diminuée.The object of the present invention is to remedy the various drawbacks of the various solutions of the known prior art and proposes a simple power connection device which is practical to implement and to use even if it is not allowed to access it. only on one side and which, once the connection has been made, has a considerably reduced contact resistance.
Pour cela, le dispositif de connexion de puissance mentionné dans le préambule est remarquable en ce que, pour le transfert de courants de haute intensité, la partie femelle est composée d'une multipince épaisse et rigide dans laquelle est insérée, lors de la connexion, la partie mâle, la partie femelle présentant une zone de pincement et la partie mâle ayant une épaisseur telles que fa force d'insertion soit comprise entre 1.5 et 5 daN et que la résultante des résistances de contact soit inférieure à 60 μΩ.For this, the power connection device mentioned in the preamble is remarkable in that, for the transfer of high intensity currents, the female part is composed of a thick and rigid multi-clamp in which is inserted, during the connection, the male part, the female part having a pinching zone and the male part having a thickness such that the insertion force is between 1.5 and 5 daN and the result of the contact resistances is less than 60 μΩ.
Ainsi, selon l'idée de l'invention, la partie femelle est composée d'une multipince épaisse et rigide qui permet d'assurer que chacune des pinces de la multipince est appliquée avec une force de pression constante et suffisament intense sur la lame épaisse unique composant la partie mâle pour obtenir une répartition uniforme des courants et imposer une résistance de contact minimale tout en respectant une force d'insertion modérée lors de la connexion. De plus, l'épaisseur et la rigidité de la multipince impliquent une limite élastique suffisament élevée pour ne pas engendrer de déformation des pinces et donc conserver une bonne reproductibilité des forces de pression exercées sur la partie mâle même après un grand nombre d'insertions. Une fois le problème de l'art antérieur résolu grâce à l'idée de l'invention et en tenant compte de l'exemple d'application proposé dans la suite de la description, l'homme du métier peut déterminer la taille de la connexion et par conséquent de la multipince et de la lame épaisse pour une application donnée. La description suivante, en regard des dessins annexés, le tout donné à titre d'exemple non limitatif, fera bien comprendre comment l'invention peut être réalisée.Thus, according to the idea of the invention, the female part is composed of a thick and rigid multi-pliers which makes it possible to ensure that each of the pliers of the multi-pliers is applied with a constant and sufficiently intense pressure force on the thick blade. single component of the male part to obtain a uniform distribution of the currents and to impose a minimum contact resistance while respecting a moderate insertion force during connection. In addition, the thickness and rigidity of the multi-pliers imply a sufficiently high elastic limit so as not to generate deformation of the pliers and therefore maintain good reproducibility of the pressure forces exerted on the male part even after a large number of insertions. Once the problem of the prior art has been solved thanks to the idea of the invention and taking into account the application example proposed in the following description, the person skilled in the art can determine the size of the connection. and therefore the multi-pliers and the thick blade for a given application. The following description, with reference to the appended drawings, all given by way of nonlimiting example, will make it clear how the invention can be implemented.
La figure 1 donne un exemple de réalisation du dispositif de connexion de puissance, le support, la partie femelle et la partie mâle étant représentés en coupe avant insertion sur la figure 1a, alors que la figure 1 b montre la partie femelle et la partie mâle de la figure 1a selon une vue de face après insertion.Figure 1 gives an embodiment of the power connection device, the support, the female part and the male part being shown in section before insertion in Figure 1a, while Figure 1b shows the female part and the male part of Figure 1a in a front view after insertion.
La figure 2 propose une courbe de variation de la résistance de contact en fonction du serrage.FIG. 2 proposes a curve of variation of the contact resistance as a function of the tightening.
La figure 3 propose une courbe de variation de la force d'insertion en fonction du serrage.FIG. 3 proposes a curve of variation of the insertion force as a function of the tightening.
Sur les figures 1 a et 1 b est représenté le dispositif de connexion de puissance 1 conforme à l'invention. Le dispositif de connexion de puissance 1 comporte, une partie femelle 2 de section en forme de lyre contenue dans et assujettie à un support isolant 3, par l'intermédiaire, par exemple, d'une plaque de métal 4 prenant appui sur le support 3 et fixée, selon l'axe XX', au moyen de vis à la partie 2, l'ensemble étant fixé à l'intérieur d'une baie (non représentée) et n'étant accessible que d'un seul côté, par l'avant de la baie. La partie femelle 2, dans cet exemple, repose grâce à deux épaulements 5 dans un logement pratiqué dans le support 3. La plaque de métal 4 est elle-même reliée aux cartes ou au bac à cartes à alimenter. Le dispositif de connexion de puissance 1 comporte également une partie mâle 6 à enficher dans la partie femelle par le côté accessible, cette partie 6 du dispositif 1 est rendue solidaire de la carte ou du module d'alimentation 7 à connecter. Conformément à l'idée de l'invention, pour le transfert de courants de haute intensité, la partie femelle est composée d'une multipince épaisse et rigide 2 (voir figure 1b) dans laquelle est insérée, lors de la connexion, la partie mâle composée d'une lame épaisse unique 6 (voir figure 1 b), la partie femelle présentant une zone de pincement P et la partie mâle ayant une épaisseur W telles que la force d'insertion nécessaire pour enficher la lame 6 dans la multipince 2 soit comprise entre 1.5 et 5 daN et que la résultante des résistances de contact soit inférieure à 60 μΩ. De manière préférée, la multipince 2 est réalisée en un matériau cuivreux tel que du bronze béryllium puis traitée thermiquement et enfin recouverte d'argent. Le traitement thermique peut ainsi consister en une mise en solution durant une heure à une température de l'ordre de 760°C, suivie d'un revenu durant trois heures à une température de l'ordre de 320°C, ce qui permet d'obtenir une dureté Rockwell 35-40 (320 HB + 10%). La couche d'argent déposée a une épaisseur de l'ordre de 10 microns.In Figures 1 a and 1 b is shown the power connection device 1 according to the invention. The power connection device 1 comprises, a female part 2 of lyre-shaped section contained in and subject to an insulating support 3, by means, for example, of a metal plate 4 bearing on the support 3 and fixed, along the axis XX ', by means of screws in part 2, the assembly being fixed inside a bay (not shown) and being accessible only on one side, by the front of the bay. The female part 2, in this example, rests by means of two shoulders 5 in a housing formed in the support 3. The metal plate 4 is itself connected to the cards or to the card tray to be supplied. The power connection device 1 also includes a male part 6 to be plugged into the female part from the accessible side, this part 6 of the device 1 is made integral with the card or the power supply module 7 to be connected. In accordance with the idea of the invention, for the transfer of high intensity currents, the female part is composed of a thick and rigid multi-clamp 2 (see FIG. 1b) into which is inserted, during connection, the male part composed of a single thick blade 6 (see FIG. 1 b), the female part having a pinching zone P and the male part having a thickness W such that the insertion force necessary to plug the blade 6 into the multi-clamp 2 is between 1.5 and 5 daN and that the resultant of the contact resistances is less than 60 μΩ. Preferably, the multi-clamp 2 is made of a copper material such as beryllium bronze, then heat treated and finally covered with silver. The heat treatment can thus consist of dissolving for one hour at a temperature of around 760 ° C, followed by tempering for three hours at a temperature of around 320 ° C, which allows '' obtain a Rockwell hardness 35-40 (320 HB + 10%). The silver layer deposited has a thickness of the order of 10 microns.
Egalement, de manière préférée, la lame épaisse 6 composant la partie mâle est réalisée en cuivre, puis est recouverte d'argent. L'épaisseur de l'argenture est équivalente à celle de la multipince.Also, preferably, the thick blade 6 composing the male part is made of copper, then is covered with silver. The thickness of the silver plating is equivalent to that of the multi-pliers.
De manière particulière, la lame épaisse 6 comporte un double biseau B à son extrémité d'insertion. En effet, l'enfichage de la lame épaisse dans la multipince se fait de manière aveugle à l'intérieur de la baie, cette particularité de la lame permet ainsi d'avantageusement faciliter une insertion souple et sans point dur.In particular, the thick blade 6 has a double bevel B at its insertion end. Indeed, the insertion of the thick blade in the multi-clamp is done in a blind manner inside the bay, this particularity of the blade thus advantageously makes it possible to facilitate a flexible insertion and without hard point.
Deux dispositifs de connexion de puissance 1 selon l'invention sont utilisés pour constituer un connecteur d'alimentation en puissance et de manière remarquable chaque dispositif de connexion de puissance comporte de plus, fixé sur le support isolant 3, un contact métallique élastique 8 dit de précharge, le contact de précharge correspondant au potentiel de masse étant directement relié au dispositif de connexion correspondant par l'intermédiaire d'un fil électrique 9, alors que le contact de précharge correspondant au potentiel non nul est prévu de longueur inférieure (en pointillé sur la figure 1a) à celle du contact de précharge correspondant au potentiel de masse et est relié au dispositif de connexion correspondant au travers d'une résistance 10 de faible valeur (en pointillé sur la figure 1a), par exemple de l'ordre de deux ohms. De cette manière, il est évité, lors de l'enfichage, toute chute brutale de tension de l'alimentation qui serait due au phénomène naturel de charge des condensateurs des modules à alimenter. Au lieu de cela, lors de l'enfichage, le contact de précharge le plus long est le premier appliqué sur la lame reliée à la masse, ce qui permet de décharger toute tension résiduelle ou parasite présente aux bornes des condensateurs des modules à alimenter, puis le second contact, plus court est à son tour appliqué à la lame reliée au potentiel non nul, ce qui permet de précharger en limitant le courant, grâce à la résistance de faible valeur, les condensateurs des modules à alimenter, au moment de l'introduction, avant que les lames ne pénètrent dans les multipinces. Ainsi, lorsque les lames rentrent véritablement en contact avec les multipinces lesdits condensateurs sont déjà préchargés et une chute brutale de tension est alors évitée. Les contacts de précharge doivent être prévus de longueur suffisante pour permettre cette précharge, ceci pour une vitesse d'enfichage nominale donnée. Cette caractéristique est également très avantageuse appliquée à des systèmes redondants, car elle permet l'enfichage d'un système pour remplacer celui en panne sans pour autant perturber ou même obliger à supprimer l'alimentation du second qui est en train de fonctionner.Two power connection devices 1 according to the invention are used to constitute a power supply connector and, remarkably, each power connection device further comprises, fixed on the insulating support 3, an elastic metallic contact 8 called preload, the preload contact corresponding to the ground potential being directly connected to the corresponding connection device via an electric wire 9, while the preload contact corresponding to the non-zero potential is provided with a shorter length (dotted on FIG. 1a) to that of the preload contact corresponding to the ground potential and is connected to the corresponding connection device through a resistor 10 of low value (dotted line in FIG. 1a), for example of the order of two ohms. In this way, it is avoided, during plugging in, any sudden drop in supply voltage which would be due to the natural phenomenon of charging the capacitors of the modules to be supplied. Instead, when plugged in, the longest preload contact is the first applied to the blade connected to ground, which allows any residual or parasitic voltage present across the capacitors of the modules to be supplied to be discharged, then the second, shorter contact is in turn applied to the blade connected to the non-zero potential, which makes it possible to preload by limiting the current, thanks to the low value resistance, the capacitors of the modules to be supplied, at the time of the 'introduction, before the blades enter the multi-clamps. So when the blades come in genuinely in contact with the multi-clamps, said capacitors are already preloaded and a sudden drop in voltage is then avoided. The preload contacts must be of sufficient length to allow this preload, for a given nominal plug-in speed. This characteristic is also very advantageous applied to redundant systems, because it allows the plugging in of a system to replace the faulty one without however disturbing or even requiring the removal of the power supply of the second which is currently operating.
De préférence, les contacts dits de précharge sont réalisés en un matériau cuivreux , puis sont recouverts d'argent.Preferably, the so-called precharge contacts are made of a copper material, then are covered with silver.
Sur la figure 2 est proposée le relevé d'une courbe de variation de la résistance de contact CR en fonction du serrage S, alors qu'il est proposé sur la figure 3, une courbe de variation de la force d'insertion IF en fonction du serrage S. Ces courbes sont représentatives de la valeur moyenne des résultats obtenus sur un ensemble d'échantillons en prenant pour variable le serrage, le serrage correspondant à la différence de cote entre l'épaisseur W de la lame 6 et la zone de pincement P présentée par la multipince 2. Des lames de différentes épaisseurs, augmentant de 0,05mm en 0,05mm ont été utilisées pour réaliser ces mesures. Il a été constaté que la limite d'élasticité de la multipince était atteinte avec un serrage de l'ordre de 0,35mm.In FIG. 2 is proposed the reading of a curve of variation of the contact resistance CR as a function of the tightening S, while it is proposed in FIG. 3, a curve of variation of the insertion force IF as a function of the tightening S. These curves are representative of the average value of the results obtained on a set of samples by taking the tightening as variable, the tightening corresponding to the difference in dimension between the thickness W of the blade 6 and the nipping area P presented by the multipince 2. Blades of different thicknesses, increasing from 0.05mm to 0.05mm were used to carry out these measurements. It was found that the elastic limit of the multi-clamp was reached with a tightening of about 0.35 mm.
Le relevé de la courbe de variation de la résistance de contact CR en fonction du serrage S a été effectué pour une intensité de courant de 100 A, la tension étant relevée au moyen d'un voltmètre V (figure 1b) connecté entre la lame et la multipince en position médiane pour le calcul de la résistance de contact. Le dispositif selon l'invention prévu pour fonctionner en service à des intensités de courant de l'ordre de 150 à 200 A a été également testé dans ces conditions et a donné entière satisfaction. I! est à remarquer qu'avec un serrage inférieur ou égal 0,1mm, la mesure de la résistance de contact est très délicate et difficilement reproductible, cette mesure devient par contre très aisée à partir deThe measurement of the variation curve of the contact resistance CR as a function of the tightening S was carried out for a current intensity of 100 A, the voltage being measured by means of a voltmeter V (FIG. 1b) connected between the blade and the multi-clamp in the middle position for calculating the contact resistance. The device according to the invention intended to operate in service at current intensities of the order of 150 to 200 A has also been tested under these conditions and has given complete satisfaction. I! it should be noted that with a tightening less than or equal to 0.1 mm, the measurement of the contact resistance is very delicate and difficult to reproduce, this measurement however becomes very easy from
0,15mm. Sur la figure 2, il apparaît que la résistance de contact minimale, très légèrement supérieure à 20 μΩ, est obtenue pour un serrage de l'ordre de 0,35mm.0.15mm. In FIG. 2, it appears that the minimum contact resistance, very slightly greater than 20 μΩ, is obtained for a tightening of the order of 0.35 mm.
Le relevé de la courbe de variation de la force d'insertion IF en fonction du serrage S fait apparaître qu'un serrage de l'ordre de 0,27mm, qui correspond à une valeur égale à 80% de la valeur considérée être la limite d'élasticité, doit être apprécié comme un maximum. En effet, la force d'insertion atteint alors une intensité de 5 daN en moyenne, ce qui constitue la valeur maximale désirée et acceptable. Le serrage sera donc de préférence limité à la fourchette allant de 0,13 à 0,27mm pour correspondre à une force d'insertion comprise, comme désiré, entre 1 ,5 et 5 daN. L'homme du métier saura déduire de ces résultats et de ces courbes les dimensions et les tolérances, pour une application donnée, relatives à l'épaisseur W de la lame et à la zone de pincement P.The reading of the curve of variation of the insertion force IF as a function of the tightening S shows that a tightening of the order of 0.27 mm, which corresponds to a value equal to 80% of the value considered to be the elastic limit, must be appreciated as a maximum. Indeed, the insertion force then reaches an intensity of 5 daN on average, which constitutes the desired and acceptable maximum value. The tightening will therefore preferably be limited to the range going from 0.13 to 0.27 mm to correspond to an insertion force comprised, as desired, between 1, 5 and 5 daN. Those skilled in the art will be able to deduce from these results and from these curves the dimensions and the tolerances, for a given application, relating to the thickness W of the blade and to the pinching zone P.
Pour conclure, le dispositif de connexion de puissance conforme à la présente invention est simple, pratique à mettre en oeuvre et à utiliser même lorsque l'accès n'est permis que d'un seul côté et, une fois la connexion effectuée, présente une résistance de contact très significativement diminuée et donc un transfert efficace des courants de haute intensité tout en autorisant une insertion aisée. Il permet, d'une part, la connexion des tensions de sortie des alimentations par enfichage, c'est-à-dire des modules à connecter du côté de l'accès libre et, d'autre part, la connexion pour l'alimentation des tensions logiques de puissance des cartes ou des bacs à cartes à une structure fixe dans une baie, du côté non accessible. En outre, grâce à l'utilisation de contacts de précharge, il permet d'éviter toute chute de tension brutale de l'alimentation, caractéristique également très avantageuse lorsqu'elle est appliquée à des systèmes redondants, puisqu'elle permet l'enfichage d'un système en remplacement d'un système en panne sans perturber ou même obliger à supprimer l'alimentation du second en train de fonctionner. Ce dispositif a donné lors des essais d'excellents résultats et ceci même après un grand nombre d'insertions. To conclude, the power connection device according to the present invention is simple, practical to implement and to use even when access is only allowed on one side and, once the connection is made, presents a contact resistance very significantly reduced and therefore an efficient transfer of high intensity currents while allowing easy insertion. It allows, on the one hand, the connection of the output voltages of the plug-in power supplies, i.e. modules to be connected on the free access side and, on the other hand, the connection for the power supply logical power voltages of cards or card bins with a fixed structure in a bay, on the non-accessible side. In addition, thanks to the use of preloading contacts, it makes it possible to avoid any sudden drop in voltage of the power supply, a characteristic which is also very advantageous when applied to redundant systems, since it allows the plugging of 'a system to replace a faulty system without disturbing or even forcing the removal of the power supply of the second one in operation. This device gave excellent results during the tests, even after a large number of insertions.

Claims

Revendications: Claims:
1. Dispositif de connexion de puissance comportant d'une part, une partie femelle élaborée autour d'une multipince de section en forme de lyre contenue dans et assujettie à un support isolant, l'ensemble étant fixé à l'intérieur d'une baie et n'étant accessible que d'un seul côté, et d'autre part, une partie mâle à enficher dans ladite partie femelle par ledit côté accessible, la partie mâle étant composée d'une lame épaisse unique, caractérisé en ce que, pour le transfert de courants de haute intensité, la partie femelle est composée d'une multipince épaisse et rigide dans laquelle est insérée, lors de la connexion, la partie mâle, ladite partie femelle présentant une zone de pincement et la partie mâle ayant une épaisseur telles que la force d'insertion soit comprise entre 1.5 et 5 daN et que la résultante des résistances de contact soit inférieure à 60 μΩ.1. Power connection device comprising on the one hand, a female part constructed around a multi-clamp of lyre-shaped section contained in and subject to an insulating support, the assembly being fixed inside a bay and being accessible only on one side, and on the other hand, a male part to be plugged into said female part by said accessible side, the male part being composed of a single thick blade, characterized in that, for the transfer of high intensity currents, the female part is composed of a thick and rigid multi-clamp into which is inserted, during the connection, the male part, said female part having a pinching zone and the male part having a thickness such that the insertion force is between 1.5 and 5 daN and that the resultant of the contact resistances is less than 60 μΩ.
2. Dispositif de connexion de puissance selon la revendication 1 , caractérisé en ce que la multipince est réalisée en un matériau cuivreux tel que du bronze béryllium puis traitée thermiquement et enfin recouverte d'argent.2. Power connection device according to claim 1, characterized in that the multi-clamp is made of a copper material such as beryllium bronze then heat treated and finally covered with silver.
3. Dispositif de connexion de puissance selon la revendication 1 ou 2, caractérisé en ce que la lame épaisse est réalisée en cuivre, puis est recouverte d'argent.3. Power connection device according to claim 1 or 2, characterized in that the thick blade is made of copper, then is covered with silver.
4. Dispositif de connexion de puissance selon la revendication 3, caractérisé en ce que la lame épaisse comporte un double biseau à son extrémité d'insertion.4. Power connection device according to claim 3, characterized in that the thick blade has a double bevel at its insertion end.
5. Connecteur d'alimentation en puissance utilisant deux dispositifs de connexion de puissance selon l'une des revendications précédentes, caractérisé en ce que, chaque dispositif de connexion de puissance comporte en outre, fixé sur le support isolant, un contact métallique élastique dit de précharge, le contact de précharge correspondant au potentiel de masse étant directement relié au dispositif de connexion correspondant, alors que le contact de précharge correspondant au potentiel non nul est prévu de longueur inférieure à celle du contact de précharge correspondant au potentiel de masse et est relié au dispositif de connexion correspondant au travers d'une résistance de faible valeur. 5. Power supply connector using two power connection devices according to one of the preceding claims, characterized in that, each power connection device further comprises, fixed on the insulating support, an elastic metal contact called preload, the preload contact corresponding to the ground potential being directly connected to the corresponding connection device, while the preload contact corresponding to the non-zero potential is provided with a length shorter than that of the preload contact corresponding to the ground potential and is connected to the corresponding connection device through a low value resistor.
6. Connecteur d'alimentation en puissance selon la revendication 5, caractérisé en ce que, les contacts dits de précharge sont réalisés en un matériau cuivreux, puis sont recouverts d'argent. 6. Power supply connector according to claim 5, characterized in that, the so-called preload contacts are made of a copper material, then are covered with silver.
EP95935995A 1994-10-24 1995-10-20 Power connection device Expired - Lifetime EP0736228B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9412656A FR2726129B1 (en) 1994-10-24 1994-10-24 POWER CONNECTION DEVICE
FR9412656 1994-10-24
PCT/FR1995/001390 WO1996013078A1 (en) 1994-10-24 1995-10-20 Power connection device

Publications (2)

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EP0736228A1 true EP0736228A1 (en) 1996-10-09
EP0736228B1 EP0736228B1 (en) 2000-01-12

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EP95935995A Expired - Lifetime EP0736228B1 (en) 1994-10-24 1995-10-20 Power connection device

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EP (1) EP0736228B1 (en)
JP (1) JP2915997B2 (en)
CA (1) CA2179290C (en)
DE (1) DE69514499T2 (en)
FR (1) FR2726129B1 (en)
WO (1) WO1996013078A1 (en)

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DE69514499D1 (en) 2000-02-17
CA2179290C (en) 1999-10-12
CA2179290A1 (en) 1996-05-02
EP0736228B1 (en) 2000-01-12
DE69514499T2 (en) 2000-05-31
US5997327A (en) 1999-12-07
JPH09503343A (en) 1997-03-31
JP2915997B2 (en) 1999-07-05
FR2726129A1 (en) 1996-04-26
WO1996013078A1 (en) 1996-05-02
FR2726129B1 (en) 1996-11-22

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