EP2919250B1 - Sichere anschlussvorrichtung und damit versehenes gerät - Google Patents

Sichere anschlussvorrichtung und damit versehenes gerät Download PDF

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Publication number
EP2919250B1
EP2919250B1 EP15425018.7A EP15425018A EP2919250B1 EP 2919250 B1 EP2919250 B1 EP 2919250B1 EP 15425018 A EP15425018 A EP 15425018A EP 2919250 B1 EP2919250 B1 EP 2919250B1
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EP
European Patent Office
Prior art keywords
coupling
connecting device
elastic tongue
safety
electrical component
Prior art date
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Application number
EP15425018.7A
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English (en)
French (fr)
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EP2919250A1 (de
Inventor
Felice Paglia
Fabrizio Promutico
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Bitron SpA
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Bitron SpA
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Publication of EP2919250A1 publication Critical patent/EP2919250A1/de
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Publication of EP2919250B1 publication Critical patent/EP2919250B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/36—Means for applying mechanical tension to fusible member
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
    • H01H2037/763—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts the spring being a blade spring

Definitions

  • the present invention relates to a safety connecting device and apparatus including such a device.
  • the invention concerns a connection device for terminal of electrical circuits, which allows opening the electrical circuit, i.e. to interrupt the power supply, in case of increase of the surrounding temperature or in case of increase of the supply electric current over a predefined level or threshold.
  • the fans for cooling vehicle engines are generally powered by means of circuits which have a first line of direct power supply, which connects the alternator or the battery of the vehicle directly to the fan, thus achieving a connection that feeds the fan at maximum speed, and a second supply line, selectable by means of suitable selector devices, such as relays and the like, in which there are, in general, resistors, which provides several safety connections, suitable to interrupt the power supply of the fan, in case of the temperature or the supply current are above a respective preset threshold.
  • suitable selector devices such as relays and the like
  • This solution implies a welding under the printed circuit board, which is generally very difficult to carry out.
  • This difficulty in the welding operation implies that such a connection is generally not very uniform, which means that the weldings carried out can also be very different among them, so that, in case of anomalies, the melting parameters of the welding, and then of the terminal detachment, i.e. threshold temperature and current, may be subject to considerable variations.
  • the recovery system is usually very complex.
  • the patent application GB812070 A is the closest prior art document and discloses an apparatus provided with a a safety connecting device (see for example the embodiment of figures 9 and 10 ).
  • This connecting device could be connected to any electrical component provided with terminals and to any circuit.
  • said connecting device (1) is intended to be provided in a containment enclosure (formed by members 48 and lugs 49, 50 and 51) having internally at least a wall (the upper wall of lug 49 and the lower wall of lug 51), said safety connecting device comprising a first element (formed by contact strip 55 and contact spring arm 57) that could be removably coupled to an electrical terminal of a component, a second element (formed by contact strip 60 and contact spring arm 59), electrically connectable with said circuit, coupling means (fuse link 58) for coupling said first element (55, 57) to said second element (59, 60), said coupling means (58) being electrically conductive and configured to reduce the mechanical coupling between said first element (55, 57) and said second element (59,60)
  • a device for connecting an electrical component to a circuit comprising two elements coupled by welding, and a safety member capable to exert a removal force between said first element and said second element.
  • a safety connecting device for connecting an electrical component, provided with at least one electrical terminal, to a circuit
  • said connecting device comprising a first element that can be removably coupled to said electrical terminal of said electrical component, a second element, electrically connected with said circuit, coupling means for coupling said first element to said second element, said coupling means being electrically conductive and configured to reduce the mechanical coupling between said first element and said second element due to an increase over than a presettable threshold temperature, to which they are subjected to, and a safety member configured to exert a separating force between said first element and said second element, wherein, when said temperature to which said coupling means are subject to exceeds said presettable threshold, said safety member interrupts the electrical coupling between said first element and said second element.
  • said safety member could comprise an elastic tongue, capable to assume a rest position and an operating position, in which it exercises the separating force between said first element and said second element.
  • said elastic tongue could be obtained on said second element.
  • said second element could comprise a body, said elastic tongue being formed on said body, preferably said elastic tongue could be formed by carving on said body.
  • said coupling means between said first element and said second element could comprise a welding by tin, conductive resin or the like.
  • said coupling means between said first element and said second element could comprise a reflow welding or "reflow”.
  • said first element could comprise a first coupling plate and said second element comprises a second coupling plate removably coupled to said first coupling plate of said first element by means of said coupling means.
  • said second element could comprise a connection terminal for the fixing and the electrical connection to said circuit.
  • said first element could comprise a base, on which a pair of through projecting slots are formed, in which said terminal of said electrical component is insertable.
  • said first element and said second element could be made of metal, metal alloy or conductive material.
  • an apparatus comprising a printed circuit board, an electrical component, such as a resistor and the like, provided with at least one electrical terminal, and a safety connecting device, as defined above, coupled to said printed circuit board by means of said connection terminal, said electrical terminal of said electrical component being coupled to said first element.
  • said apparatus could comprise a containment enclosure, having internally at least one wall, and said safety connecting device is arranged approached to said wall of said containment enclosure, so that said elastic tongue is in said operating position or preloaded, such that, if the temperature at which said safety connecting device exceeds a respective presettable threshold, or the supply current of said electrical component passing through said safety connecting device exceeds a respective further presettable threshold, then the coupling of coupling means between said first element and said second element would tend to reduce the mechanical coupling, until the force exerted by said elastic tongue separates said first element from said second element, interrupting the supply of said electrical component.
  • a safety connecting device 1 Said the connecting device 1 comprises a first element 2 and a second element 3.
  • Said first element 2 is made of metal, metal alloy or conductive material, and comprises a base 21, on which a pair of protruding through slots 23 are obtained, in which a terminal of a device to be protected is inserted, and a first coupling plate 22.
  • Said second element 3 is also made of metal or conductive material, and comprises a body 31, which has a connection terminal 32 arranged at the top, by which said second element 3 is fixable to a chassis or to an integrated circuit, and a second coupling plate 33, arranged below, coupled by welding, e.g. tin welding, or in general by means of coupling by adhesion, such as resin and the like, to said first coupling plate 22 of said first element 2.
  • an elastic tongue 34 is formed by carving, as a safety member. Said elastic tongue 34 is such as to assume a rest position, in which it is protruding with respect to said body 31, and an operating position, or preloaded, in which it is substantially coplanar with said body 31. The operation of said elastic tongue 34 will be better defined in the following.
  • the coupling between said first element 2 and said second element 3 is performed by reflow welding or "reflow", which is a process in which a welding paste is used, typically a mixture of tin in powder and fluxing, in which preliminary and temporarily said first 2 and second element 3 are fixed by said paste, and subsequently, controlled heat is applied, by suitable means, such as ovens, infrared lamps or hot air welders, which melts the alloy and welds permanently said elements 2 and 3.
  • reflow welding or "reflow” is a process in which a welding paste is used, typically a mixture of tin in powder and fluxing, in which preliminary and temporarily said first 2 and second element 3 are fixed by said paste, and subsequently, controlled heat is applied, by suitable means, such as ovens, infrared lamps or hot air welders, which melts the alloy and welds permanently said elements 2 and 3.
  • Figures 9 and 10 show said safety connection device 1 that connects a resistor 4 to a printed circuit board 5.
  • said connection device 1 presents the second coupling plate 33 of said second element 3 and the first coupling plate 22 of said first element 2 fixed by tin welding.
  • connection terminal 32 is fixed to a printed circuit board 5, while said first element 2 is electrically connected to a terminal 41 of a resistor 4.
  • said terminal 41 is inserted through said projecting slots 23, so as to achieve an electrical contact.
  • the electrical connection between said terminal 41 and said base 21 of said first element 2 can be possibly also secured by a weld.
  • a control apparatus A for controlling the supply of a cooling fan for vehicles arranged in a containment enclosure I, which has a printed circuit board 5, to which a resistor 4 is connected.
  • a connecting device safety 1 is arranged on a least one of the terminals 41 of said resistor 4 .
  • Said safety connection device 1 is arranged close to the wall P inside the containment enclosure I, so that said elastic tongue 34 is in the operating position or preloaded, thus exerting a constant away force on the second element 3 from said first element 2, which thus tends to urge the welding between said second coupling plate 33 of said second element 3 and said first coupling plate 22 of said first element 2.
  • connection terminal 32 can also be fixed to a fulcrum C.
  • connection device 1 To restore the operation of the connection device 1 is necessary to proceed again to weld said first element 2 and said second element 3.
  • An advantage of the present invention is that the safety device is assembled "off-line", in self standing production process phases that allow the control of the parameters relating to the welding process. This allows increasing the degree of repeatability of the weld between the first element and the second element.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)

Claims (9)

  1. Gerät (A), umfassend:
    eine Leiterplatte (5);
    eine elektrische Komponente (4), wie einen Widerstand und dergleichen, die mit mindestens einer elektrischen Klemme (41) ausgestattet ist,
    ein Einschlussgehäuse (I), das innen mindestens eine Wand (P) aufweist,
    eine sichere Anschlussvorrichtung (1) zum Anschließen der elektrischen Komponente (4) an die Leiterplatte (5), wobei die sichere Anschlussvorrichtung (1) vorgesehen ist, in dem Einschlussgehäuse (1) bereitgestellt zu werden, wobei die sichere Anschlussvorrichtung (1) umfasst:
    ein erstes Element (2), das entfernbar an die elektrische Klemme (41) der elektrischen Komponente (4) gekoppelt werden kann,
    ein zweites Element (3), das elektrisch an die Schaltung (5) angeschlossen ist,
    Kopplungsmittel zum Koppeln des ersten Elements (2) an das zweite Element (3), wobei die Kopplungsmittel elektrisch leitend und ausgestaltet sind, um die mechanische Kopplung zwischen dem ersten Element (2) und dem zweiten Element (3) infolge eines Anstiegs über eine vorab einstellbare Schwellenwerttemperatur zu reduzieren, der sie ausgesetzt werden,
    ein Sicherheitselement (34), das ausgestaltet ist, um eine Trennkraft zwischen dem ersten Element (2) und dem zweiten Element (3) auszuüben,
    wobei das Sicherheitselement (34), wenn die Temperatur, der die Kopplungsmittel ausgesetzt werden, einen vorab einstellbaren Schwellenwert übersteigt, die elektrische Kopplung zwischen dem ersten Element (2) und dem zweiten Element (3) unterbricht,
    das Sicherheitselement eine elastische Zunge (34) umfasst, die eine Ruheposition und eine Arbeitsposition annehmen kann, in der die elastische Zunge (34) an die Wand (P) angenähert ist, so dass die elastische Zunge (34) vorgespannt ist und eine Trennkraft zwischen dem ersten Element (2) und dem zweiten Element (3) ausübt,
    die sichere Anschlussvorrichtung (1) mittels der Anschlussklemme (32) an die Leiterplatte (5) gekoppelt ist, wobei die elektrische Klemme (41) der elektrischen Komponente (4) an das erste Element (2) gekoppelt ist,
    wobei die sichere Anschlussvorrichtung (1) an die Wand (P) des Einschlussgehäuses (1) angenähert angeordnet ist, so dass die elastische Zunge (34) sich in der Arbeitsposition oder vorgespannt befindet, damit, wenn die Temperatur, bei der die sichere Anschlussvorrichtung (1) einen jeweils vorab einstellbaren Schwellenwert überschreitet oder der Versorgungsstrom der elektrischen Komponente (4), der die sichere Anschlussvorrichtung (1) passiert, einen jeweiligen weiteren vorab einstellbaren Schwellenwert überschreitet, dann die Kopplung der Kopplungsmittel zwischen dem ersten Element (2) und dem zweiten Element (3) die mechanische Kopplung tendenziell reduziert, bis die von der elastischen Zunge (34) ausgeübte Kraft das erste Element (2) von dem zweiten Element (3) trennt, wodurch die Versorgung der elektrischen Komponente (4) unterbrochen wird.
  2. Gerät (A) nach Anspruch 1, dadurch gekennzeichnet, dass die elastische Zunge (34) auf dem zweiten Element (3) erhalten wird.
  3. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das zweite Element (3) einen Körper (31) umfasst, die elastische Zunge (34) auf dem Körper (31) gebildet ist, vorzugsweise die elastische Zunge (34) durch einen Schnitt bzw. Schnitte auf dem Körper (31) gebildet ist.
  4. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kopplungsmittel zwischen dem ersten Element (2) und dem zweiten Element (3) eine Schweißnaht durch Zinn, leitendes Harz oder dergleichen umfassen.
  5. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kopplungsmittel zwischen dem ersten Element (2) und dem zweiten Element (3) Reflow-Schweißen oder "Reflow" umfassen.
  6. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das erste Element (2) eine erste Kopplungsplatte (22) umfasst und das zweite Element eine zweite Kopplungsplatte (33) umfasst, die mithilfe der Kopplungsmittel entfernbar an die erste Kopplungsplatte (22) des ersten Elements (2) gekoppelt ist.
  7. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das zweite Element (3) eine Anschlussklemme (32) zur Befestigung und zum elektrischen Anschluss an die Schaltung (5) umfasst.
  8. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das erste Element (2) eine Basis (21) umfasst, auf der ein Paar durchgehender vorspringender Schlitze (23) gebildet ist, worin die Klemme (41) der elektrischen Komponente (4) einführbar ist.
  9. Gerät (A) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das erste Element (2) und das zweite Element (3) aus Metall, Metalllegierung oder leitendem Material gefertigt sind.
EP15425018.7A 2014-03-12 2015-03-11 Sichere anschlussvorrichtung und damit versehenes gerät Active EP2919250B1 (de)

Applications Claiming Priority (1)

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ITRM20140125 2014-03-12

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EP2919250B1 true EP2919250B1 (de) 2017-06-28

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812070A (en) * 1956-02-16 1959-04-15 Belling & Lee Ltd Improvements in or relating to electrical fuses

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790049A (en) * 1955-07-11 1957-04-23 Mcgraw Electric Co Protectors for electric circuits
DE1991022U (de) * 1967-06-27 1968-08-08 Eastman Kodak Company, Rochester, N.Y. (V.St.A.) Stromkreisunterbrecher
US6603385B2 (en) * 1997-11-21 2003-08-05 Safety Thermal Components, Inc. Safety devices for electrical circuits and systems
DE102006041123B4 (de) * 2006-09-01 2009-03-12 Beru Ag Elektrischer Stromkreis mit einer thermisch-mechanischen Sicherung
FR2926394B1 (fr) * 2008-01-10 2010-01-22 Seb Sa Dispositif de securite thermique
DE102008053182B4 (de) * 2008-10-24 2015-01-08 Continental Automotive Gmbh Vorrichtung mit einer Elektronischen Baugruppe mit Thermosicherung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB812070A (en) * 1956-02-16 1959-04-15 Belling & Lee Ltd Improvements in or relating to electrical fuses

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