EP3599666B1 - Electrical connection device for an insulated metal substrate - Google Patents
Electrical connection device for an insulated metal substrate Download PDFInfo
- Publication number
- EP3599666B1 EP3599666B1 EP19187922.0A EP19187922A EP3599666B1 EP 3599666 B1 EP3599666 B1 EP 3599666B1 EP 19187922 A EP19187922 A EP 19187922A EP 3599666 B1 EP3599666 B1 EP 3599666B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- terminal
- rod
- connection device
- electrical connection
- substrate
- 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.)
- Active
Links
- 229910052751 metal Inorganic materials 0.000 title claims description 31
- 239000002184 metal Substances 0.000 title claims description 31
- 239000000758 substrate Substances 0.000 title claims description 27
- 238000010292 electrical insulation Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 239000011810 insulating material Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 206010014357 Electric shock Diseases 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
Images
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
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/28—Clamped connections, spring connections
- H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
- H01R4/302—Clamped connections, spring connections utilising a screw or nut clamping member having means for preventing loosening of screw or nut, e.g. vibration-proof connection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/7088—Arrangements for power supply
Definitions
- the technical field of the invention is that of electrical connection devices for a printed circuit and in particular for a circuit of the insulated metal substrate type.
- Insulated metal substrates are used more and more today, in particular for power electronic circuits and for circuits used in lighting based on light emitting diodes (LEDs).
- LEDs light emitting diodes
- Insulated metal substrates comprise a metal plate (or sole), most often made of aluminum, on which is deposited an insulating layer which carries a printed circuit.
- the metal plate allows the heat generated by the printed circuit to be evacuated.
- connection device comprising a rod, such as a threaded stud, on which is positioned a conductive nut which clamps a conductive sleeve between a conductive track of the insulated metal substrate and a conductive track of another printed circuit.
- This connection is specific to the creation of a link between two printed circuits fixed at a distance from one another. It does not allow an electrical connection to be made with a contact terminal connecting the metal substrate insulated to the outside. In particular, if no electrical contact must be made simultaneously between the terminal and the two circuits, the level of electrical insulation between the terminal and the isolated circuits becomes insufficient.
- connection described by the patent US6830459 also does not guarantee a low contact resistance over time and over a wide temperature range.
- the aim of the invention is to provide a connection device making it possible to easily connect a circuit of an insulated metal substrate to a power conductor, while ensuring a high level of insulation between the terminal and the rod which allows the mechanical fixing of the terminal on the circuit.
- the subject of the invention is an electrical connection device for an insulated metal substrate according to claim 1.
- the annular seal may be an O-ring.
- the flaring of the terminal may have a conical profile.
- the rod may be a threaded stud having a head crimped in the metal mass of the substrate.
- the tightening means may comprise at least one elastic lock washer.
- the resilient lock washer will not be tightened to its maximum compression to make it possible to compensate for thermal expansions.
- an insulated metal substrate 1 (or SMI) is conventionally constituted by a metal plate 1a on which is deposited an insulating layer 1b which itself carries a conductive layer 1c (made of copper for example) which is formed of conductive tracks.
- the insulating layer 1b and the conductive layer or tracks 1c form a printed circuit which is integral with the metal plate 1a.
- the latter allows the evacuation of the calories generated by the printed circuit.
- the insulating layer 1b will be made of a material promoting thermal transfer.
- the metal plate 1a can be made of aluminum or copper.
- the insulated metal substrate comprises at least one rod 2 which is fixed to the metal plate 1a of the insulated metal substrate 1.
- Each stud 2 has a head 2a which is crimped into the metal plate 1a.
- the number of rods will be chosen according to the current density flowing in them.
- the diameter of the rods will also depend on the mechanical strength desired for the connection.
- At least one contact terminal 3 which is intended to bring a supply current to the circuit carried by the insulated metal substrate 1.
- the terminal 3 is in electrical contact with the conductive track 1c carried by the substrate 1.
- the conductive track 1c is not in contact with the rod 2 because an annular insulating savings zone 4 has been arranged at this level.
- This zone will have a sufficient width to avoid any dielectric breakdown between the terminal 3 and the rod 2.
- a width of the order of 1 to 2 mm is generally sufficient for supply voltages of the order of 500 volts.
- connection device comprises an insulating barrel 5, having a tubular part 5a which is positions in a hole 3a of the terminal 3, and a collar 5b which is held applied against the terminal 3 by a clamping means 6, integral with the rod 2.
- the clamping means 6 here comprises a nut 7, which is screwed onto the rod 2, and which pushes a set of washers 8a, 8b and 8c against the insulating barrel 5.
- the lower washer 8c bears on the collar 5b of the barrel insulator 5.
- a printed circuit 9 is interposed between the middle washer 8b and the lower washer 8c.
- the upper washer 8a is an elastic lock washer which prevents loosening of the nut 7 and compensates for thermal expansions.
- the elastic lock washer is only crushed to about 50% of its maximum compression so that thermal expansions can be compensated.
- the barrel 5 provides the electrical insulation of the terminal 3 and the rod 2.
- the tubular part 5a of the barrel is interposed radially between the terminal 3 and the rod 2 and the collar 5b is interposed between the washer 8c and terminal 3.
- the thicknesses of the barrel 5, both at the level of the tubular part 5a and of the collar 5b, are chosen so as to ensure good insulation.
- the hole 3a of the terminal 3 comprises a flare 3b which receives an annular seal 10.
- the flare 3b is here conical and the annular seal 10 is an O-ring.
- This seal 10 is made of an insulating material, for example of the silicone type.
- the seal 10 is therefore interposed between the rod 2 and the terminal 3, below the tubular part 5a of the insulating barrel 5.
- the seal completes the electrical insulation between the rod 2 and the terminal 3. In fact, it partially fills the cavity separating the rod 2 and the terminal 3, which reduces the risk of electric shock in the air.
- the contact resistance between terminal 3 and conductive track 1c remains reduced by around 20 micro ohms for the entire temperature range (from -50 ° C to + 100 ° C). This contact resistance is ensured over the entire temperature range thanks to the presence of the elastic washer 8a which makes it possible to compensate for expansions.
- the device according to the invention makes it possible to easily achieve a connection with low contact resistance, thanks to the positive tightening provided by the nut 7 and the washers 8a, 8b, 8c.
- the tightening is combined with the electrical insulation, thanks to the barrel 5 on the one hand, and the O-ring 10 on the other hand.
- annular seal with a different section (square or prismatic) which would be housed in a flare of different shape, for example a cylindrical countersink.
- the seal will reduce the presence of air in the flare, thus improving the insulation.
- the compression of the seal by the barrel may also intervene and deform the seal.
- One or more rods 2 made in the form of threaded studs crimped in the insulated metal substrate 1 have also been described.
- the rods could alternatively be threaded rods fixed by a nut on each side of the insulated metal substrate. Smooth rods can also be used, but carrying at their end a clamping device, for example a toggle.
Landscapes
- Coupling Device And Connection With Printed Circuit (AREA)
- Multi-Conductor Connections (AREA)
Description
Le domaine technique de l'invention est celui des dispositifs de connexion électrique pour un circuit imprimé et en particulier pour un circuit de type substrat métallique isolé.The technical field of the invention is that of electrical connection devices for a printed circuit and in particular for a circuit of the insulated metal substrate type.
Les substrats métalliques isolés (ou SMI) sont de plus en plus utilisés aujourd'hui, en particulier pour les circuits électroniques de puissance et pour les circuits utilisés dans les éclairages à base de diodes émettrices de lumière (LED).Insulated metal substrates (or SMI) are used more and more today, in particular for power electronic circuits and for circuits used in lighting based on light emitting diodes (LEDs).
Les substrats métalliques isolés comprennent une plaque métallique (ou semelle), le plus souvent en aluminium, sur laquelle est déposée une couche isolante qui porte un circuit imprimé.Insulated metal substrates comprise a metal plate (or sole), most often made of aluminum, on which is deposited an insulating layer which carries a printed circuit.
La plaque métallique permet d'évacuer les calories engendrées par le circuit imprimé.The metal plate allows the heat generated by the printed circuit to be evacuated.
Il est nécessaire de réaliser des connexions électriques fiables sur le substrat métallique isolé, c'est-à-dire sur le circuit imprimé porté par le substrat métallique isolé. Ces connexions électriques doivent tout à la fois être peu coûteuses à réaliser et à assembler, et également assurer un contact électrique de faible impédance (quelques dizaines de micro ohms), contact qui doit rester constant dans le temps. Le courant passant par la connexion peut par ailleurs atteindre des valeurs importantes (quelques centaines d'ampères, voire jusqu'à 1000 ampères).It is necessary to make reliable electrical connections on the insulated metal substrate, that is to say on the printed circuit carried by the insulated metal substrate. These electrical connections must at the same time be inexpensive to make and to assemble, and also ensure an electrical contact of low impedance (a few tens of micro ohms), a contact which must remain constant over time. The current passing through the connection can also reach significant values (a few hundred amps, or even up to 1000 amps).
Il est connu du brevet
Cette connexion est spécifique à la réalisation d'une liaison entre deux circuits imprimés fixés à distance l'un de l'autre. Elle ne permet pas de réaliser une liaison électrique avec une cosse de contact reliant le substrat métallique isolé à l'extérieur. En particulier, si aucun contact électrique ne doit se faire simultanément entre la cosse et les deux circuits, le niveau d'isolation électrique entre la cosse et les circuits isolés devient insuffisant.This connection is specific to the creation of a link between two printed circuits fixed at a distance from one another. It does not allow an electrical connection to be made with a contact terminal connecting the metal substrate insulated to the outside. In particular, if no electrical contact must be made simultaneously between the terminal and the two circuits, the level of electrical insulation between the terminal and the isolated circuits becomes insufficient.
La connexion décrite par le brevet
C'est le but de l'invention que de proposer un dispositif de connexion permettant de relier facilement à un conducteur de puissance un circuit d'un substrat métallique isolé, tout en assurant un niveau d'isolation important entre la cosse et la tige qui permet la fixation mécanique de la cosse sur le circuit.The aim of the invention is to provide a connection device making it possible to easily connect a circuit of an insulated metal substrate to a power conductor, while ensuring a high level of insulation between the terminal and the rod which allows the mechanical fixing of the terminal on the circuit.
Ainsi l'invention a pour objet un dispositif de connexion électrique pour substrat métallique isolé selon la revendication 1.Thus the subject of the invention is an electrical connection device for an insulated metal substrate according to claim 1.
Selon un mode particulier de réalisation, le joint annulaire pourra être un joint torique.According to a particular embodiment, the annular seal may be an O-ring.
L'évasement de la cosse pourra avoir un profil conique. Selon un mode particulier de réalisation, la tige pourra être un goujon fileté ayant une tête sertie dans la masse métallique du substrat.The flaring of the terminal may have a conical profile. According to a particular embodiment, the rod may be a threaded stud having a head crimped in the metal mass of the substrate.
Avantageusement, le moyen de serrage pourra comprendre au moins une rondelle frein élastique.Advantageously, the tightening means may comprise at least one elastic lock washer.
Avantageusement la rondelle frein élastique ne sera pas serrée à son écrasement maximal pour permettre de compenser les dilatations thermiques.Advantageously, the resilient lock washer will not be tightened to its maximum compression to make it possible to compensate for thermal expansions.
L'invention sera mieux comprise à la lecture de la description qui va suivre d'un mode particulier de réalisation, description faite en référence aux dessins annexés et dans lesquels :
- La
figure 1 est une vue en coupe d'une partie d'un substrat métallique isolé comportant un dispositif de connexion selon l'invention; - La
figure 2 est une vue partielle, en perspective et en coupe de ce substrat métallique isolé portant le dispositif de connexion selon l'invention.
- The
figure 1 is a sectional view of part of an insulated metal substrate comprising a connection device according to the invention; - The
figure 2 is a partial perspective view in section of this insulated metal substrate carrying the connection device according to the invention.
En se reportant aux figures, un substrat métallique isolé 1 (ou SMI) est constitué de façon classique par une plaque métallique la sur laquelle est déposée une couche isolante 1b qui porte elle-même une couche conductrice 1c (en cuivre par exemple) qui est formée de pistes conductrices.Referring to the figures, an insulated metal substrate 1 (or SMI) is conventionally constituted by a
La couche isolante 1b et la couche ou les pistes conductrices 1c forment un circuit imprimé qui est solidaire de la plaque métallique la. Cette dernière permet l'évacuation des calories générées par le circuit imprimé. La couche isolante 1b sera réalisée en un matériau favorisant le transfert thermique.The
La plaque métallique la peut être réalisée en aluminium ou en cuivre.The
Comme on le voit sur les figures, le substrat métallique isolé comprend au moins une tige 2 qui est fixée à la plaque métallique la du substrat métallique isolé 1.As can be seen in the figures, the insulated metal substrate comprises at least one rod 2 which is fixed to the
Il y a ici trois tiges 2 parallèles (visibles à la
Sur la ou les tiges 2 vient se fixer au moins une cosse de contact 3 qui est destinée à amener un courant d'alimentation au circuit porté par le substrat métallique isolé 1.On the rod (s) 2 is fixed at least one
La cosse 3 est en contact électrique avec la piste conductrice 1c portée par le substrat 1. Comme on le voit sur la
Par ailleurs le dispositif de connexion comporte un canon isolant 5, présentant une partie tubulaire 5a qui se positionne dans un trou 3a de la cosse 3, et une collerette 5b qui est maintenue appliquée contre la cosse 3 par un moyen de serrage 6, solidaire de la tige 2.Furthermore, the connection device comprises an
Le moyen de serrage 6 comprend ici un écrou 7, qui se visse sur la tige 2, et qui pousse un jeu de rondelles 8a, 8b et 8c contre le canon isolant 5. La rondelle inférieure 8c est en appui sur la collerette 5b du canon isolant 5. Un circuit imprimé 9 est interposé entre la rondelle médiane 8b et la rondelle inférieure 8c. Ainsi la tige 2 du dispositif de connexion assure également un maintien mécanique de ce circuit 9 à distance du substrat métallique isolé 1 et parallèlement à ce dernier.The clamping means 6 here comprises a
La rondelle supérieure 8a est une rondelle frein élastique qui empêche le desserrage de l'écrou 7 et compense les dilatations thermiques. La rondelle frein élastique n'est écrasée qu'à 50% environ de son écrasement maximal pour que les dilatations thermiques puissent être compensées.The
Le canon 5 assure l'isolation électrique de la cosse 3 et de la tige 2. En effet la partie tubulaire 5a du canon s'interpose radialement entre la cosse 3 et la tige 2 et la collerette 5b s'interpose entre la rondelle 8c et la cosse 3.The
Les épaisseurs du canon 5, tant au niveau de la partie tubulaire 5a que de la collerette 5b, sont choisies de façon à assurer une bonne isolation.The thicknesses of the
Comme on le voit sur les figures, le trou 3a de la cosse 3 comporte un évasement 3b qui reçoit un joint annulaire 10. L'évasement 3b est ici conique et le joint annulaire 10 est un joint torique. Ce joint 10 est réalisé en un matériau isolant par exemple de type silicone.As can be seen in the figures, the
Le joint 10 s'interpose donc entre la tige 2 et la cosse 3, en dessous de la partie tubulaire 5a du canon isolant 5.The
Le joint complète l'isolement électrique entre la tige 2 et la cosse 3. En effet, il permet de combler en partie la cavité séparant la tige 2 et la cosse 3, ce qui réduit les risques de décharge électrique dans l'air.The seal completes the electrical insulation between the rod 2 and the
On a pu mesurer que la tension d'isolement se trouvait fortement augmentée grâce à la seule présence du joint 10. On passe ainsi, avec la configuration représentée sur les figures, d'une tension d'isolement de 500 volts sans joint à une tension d'isolement supérieure à 1500 volts continus avec le joint.It was possible to measure that the insulation voltage was greatly increased thanks to the sole presence of the
La résistance de contact entre la cosse 3 et la piste conductrice 1c reste réduite de l'ordre de 20 micro ohms pour toute la gamme de températures (de -50°C à +100°C). Cette résistance de contact est assurée sur toute la plage de températures grâce à la présence de la rondelle élastique 8a qui permet de compenser les dilatations.The contact resistance between
Ainsi le dispositif selon l'invention permet de réaliser facilement une connexion à faible résistance de contact, grâce au serrage positif assuré par l'écrou 7 et les rondelles 8a,8b,8c.Thus the device according to the invention makes it possible to easily achieve a connection with low contact resistance, thanks to the positive tightening provided by the
Le serrage se combine à l'isolation électrique, grâce au canon 5 d'une part, et au joint torique 10 d'autre part.The tightening is combined with the electrical insulation, thanks to the
Il est nécessaire de laisser un jeu axial entre le canon 5 et le substrat métallique isolé 1 pour permettre le serrage, donc le bon contact électrique. Ce jeu serait source de risque de claquage diélectrique. La présence du joint torique 10 permet de faire disparaître ce risque. Par ailleurs la déformabilité du joint 10 permet sa compression par le canon 5 lors du serrage, ce qui augmente l'isolation en réduisant la présence d'air entre la cosse 3 et la tige 2.It is necessary to leave an axial play between the
On a décrit un mode de réalisation dans lequel le joint était torique (section circulaire) et logé dans un évasement à profil conique.An embodiment has been described in which the seal was O-ring (circular section) and housed in a flare with a conical profile.
Il serait possible de mettre en œuvre un joint annulaire à section différente (carrée ou prismatique) qui se logerait dans un évasement de forme différente, par exemple un lamage cylindrique.It would be possible to implement an annular seal with a different section (square or prismatic) which would be housed in a flare of different shape, for example a cylindrical countersink.
Dans tous les cas, le joint permettra de réduire la présence d'air dans l'évasement, donc améliorera l'isolation. La compression du joint par le canon pourra également intervenir et déformer le joint.In all cases, the seal will reduce the presence of air in the flare, thus improving the insulation. The compression of the seal by the barrel may also intervene and deform the seal.
On a également décrit une ou plusieurs tiges 2 réalisées sous la forme de goujons filetés sertis dans le substrat métallique isolé 1.One or more rods 2 made in the form of threaded studs crimped in the insulated metal substrate 1 have also been described.
Les tiges pourraient alternativement être des tiges filetées fixées par un écrou de chaque côté du substrat métallique isolé. On pourra aussi utiliser des tiges lisses, mais portant à leur extrémité un dispositif de serrage, par exemple une grenouillère.The rods could alternatively be threaded rods fixed by a nut on each side of the insulated metal substrate. Smooth rods can also be used, but carrying at their end a clamping device, for example a toggle.
Claims (6)
- Electrical connection device for an insulated metal substrate, the device comprising a substrate, a contact terminal, and at least one rod fixed to a metal plate of the substrate and on which is fixed the contact terminal which is in electrical contact with a conductive track carried by the substrate, the terminal comprising a hole allowing the passage of the rod, the device being characterized in that it further comprises a clamping means and an annular seal made of insulating material, the device comprising an insulating barrel which has a tubular part positioned in the hole and a collar which is kept applied against the terminal by the clamping means integral with the rod, the barrel thus ensuring the electrical insulation of the terminal and the rod, the hole of the terminal comprising a flaring receiving the annular seal which is interposed between the rod and the terminal.
- An electrical connection device according to claim 1, characterized in that the annular seal is an O-ring.
- Electrical connection device according to claim 2, characterized in that the flaring of the terminal has a conical profile.
- Electrical connection device according to one of claims 1 to 3, characterized in that the rod is a threaded stud having a head crimped into the metal mass of the substrate.
- Electrical connection device according to one of claims 1 to 4, characterized in that the clamping means comprises at least one elastic lock washer.
- Electrical connection device according to claim 5, characterized in that the elastic lock washer is not tightened to its maximum compression.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1800796A FR3084212B1 (en) | 2018-07-23 | 2018-07-23 | ELECTRICAL CONNECTION DEVICE FOR AN INSULATED METAL SUBSTRATE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3599666A1 EP3599666A1 (en) | 2020-01-29 |
EP3599666B1 true EP3599666B1 (en) | 2021-03-10 |
Family
ID=65031166
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19187922.0A Active EP3599666B1 (en) | 2018-07-23 | 2019-07-23 | Electrical connection device for an insulated metal substrate |
Country Status (2)
Country | Link |
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EP (1) | EP3599666B1 (en) |
FR (1) | FR3084212B1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6830459B2 (en) | 2003-02-21 | 2004-12-14 | Richard Travis West | High current, high mechanical strength connectors for insulated metal substrate circuit boards |
FR2865073B1 (en) * | 2004-01-08 | 2009-11-13 | Airbus France | ELECTRICAL CONNECTION DEVICE FOR MAKING A METALLIZATION POINT, SUPPORT EQUIPPED WITH SUCH A CONNECTION DEVICE, AND AIRCRAFT EQUIPPED WITH SUCH A SUPPORT |
GB2540783B (en) * | 2015-07-27 | 2017-09-06 | Sevcon Ltd | Power electronics assembly |
-
2018
- 2018-07-23 FR FR1800796A patent/FR3084212B1/en active Active
-
2019
- 2019-07-23 EP EP19187922.0A patent/EP3599666B1/en active Active
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
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EP3599666A1 (en) | 2020-01-29 |
FR3084212A1 (en) | 2020-01-24 |
FR3084212B1 (en) | 2021-04-23 |
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