EP3599666B1 - Elektrische verbindungsvorrichtung für ein isoliertes metallsubstrat - Google Patents

Elektrische verbindungsvorrichtung für ein isoliertes metallsubstrat Download PDF

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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
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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
Application number
EP19187922.0A
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English (en)
French (fr)
Other versions
EP3599666A1 (de
Inventor
Philippe DECROUX
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.)
Nexter Systems SA
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Nexter Systems SA
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Publication date
Application filed by Nexter Systems SA filed Critical Nexter Systems SA
Publication of EP3599666A1 publication Critical patent/EP3599666A1/de
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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
    • 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)

Claims (6)

  1. Elektrische Verbindungsvorrichtung für ein isoliertes Metallsubstrat, wobei die Vorrichtung ein Substrat, eine Kontaktklemme und mindestens einen Stab umfasst, der an einer Metallplatte des Substrats befestigt ist und auf dem sich die Kontaktklemme befestigt, die in elektrischem Kontakt mit einer Leiterbahn ist, die von dem Substrat getragen wird, wobei die Klemme ein Loch aufweist, das den Durchgang des Stabs gestattet, wobei die Vorrichtung dadurch gekennzeichnet ist, dass sie ferner ein Spannmittel und eine Ringdichtung aus Isoliermaterial umfasst, wobei die Vorrichtung eine Isoliermuffe aufweist, die einen rohrförmigen Teil aufweist, der sich in dem Loch positioniert, und einen Kragen, der von dem mit dem Stab fest verbundenen Spannmittel auf der Klemme anliegend gehalten wird, wobei die Muffe somit die elektrische Isolation der Klemme und des Stabs sichert, wobei das Loch der Klemme eine Erweiterung aufweist, die die Ringdichtung zwischen dem Stab und der Klemme aufnimmt.
  2. Elektrische Verbindungsvorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Ringdichtung eine torische Dichtung ist.
  3. Elektrische Verbindungsvorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Erweiterung der Klemme ein konisches Profil hat.
  4. Elektrische Verbindungsvorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Stab ein Gewindebolzen mit einem in der Metallmasse des Substrats eingefassten Kopf ist.
  5. Elektrische Verbindungsvorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Spannmittel mindestens eine elastische Bremsscheibe umfasst.
  6. Elektrische Verbindungsvorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die elastische Bremsscheibe nicht maximal zusammengedrückt gespannt ist.
EP19187922.0A 2018-07-23 2019-07-23 Elektrische verbindungsvorrichtung für ein isoliertes metallsubstrat Active EP3599666B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1800796A FR3084212B1 (fr) 2018-07-23 2018-07-23 Dispositif de connexion electrique pour un substrat metallique isole

Publications (2)

Publication Number Publication Date
EP3599666A1 EP3599666A1 (de) 2020-01-29
EP3599666B1 true EP3599666B1 (de) 2021-03-10

Family

ID=65031166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19187922.0A Active EP3599666B1 (de) 2018-07-23 2019-07-23 Elektrische verbindungsvorrichtung für ein isoliertes metallsubstrat

Country Status (2)

Country Link
EP (1) EP3599666B1 (de)
FR (1) FR3084212B1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
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 (fr) * 2004-01-08 2009-11-13 Airbus France Dispositif de connexion electrique destine a realiser un point de metallisation, support muni d'un tel dispositif de connexion, et aeronef equipe d'un tel support
GB2540783B (en) * 2015-07-27 2017-09-06 Sevcon Ltd Power electronics assembly

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3599666A1 (de) 2020-01-29
FR3084212B1 (fr) 2021-04-23
FR3084212A1 (fr) 2020-01-24

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