EP1562208A1 - Thermal switch for an electronic component - Google Patents

Thermal switch for an electronic component Download PDF

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Publication number
EP1562208A1
EP1562208A1 EP05300032A EP05300032A EP1562208A1 EP 1562208 A1 EP1562208 A1 EP 1562208A1 EP 05300032 A EP05300032 A EP 05300032A EP 05300032 A EP05300032 A EP 05300032A EP 1562208 A1 EP1562208 A1 EP 1562208A1
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EP
European Patent Office
Prior art keywords
thermal switch
electronic component
component
housing
switch according
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.)
Withdrawn
Application number
EP05300032A
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German (de)
French (fr)
Inventor
Philippe Burguburu
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.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
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 Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1562208A1 publication Critical patent/EP1562208A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H01H37/043—Mountings on controlled apparatus
    • 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
    • H01H85/48—Protective devices wherein the fuse is carried or held directly by the base

Definitions

  • the present invention relates to a thermal switch for protect an electronic component against abnormal heating.
  • the present invention more particularly relates to a thermal switch adapted to its implementation on a printed circuit board. It is known that in the field of electronic organs, there is a steady increase in electrical power passing through electronic cards. These powers correspond to important intensities which circulate in the tracks of the electronic circuits.
  • this break and this recovery can happen many times and the destruction of the component may occur before the user has overview of the dysfunction of the controlled organ.
  • the destruction of the component can then take two forms: Either it remains “open”, ie isolated, and the current is permanently cut: The user loses the corresponding function; either he stays in position "closed”, or “almost closed”, it then starts to heat up strongly which can lead to a destruction of the electronic map and its environment if precautions are not taken to limit to the source the consequences of these warm-ups.
  • the temperature of the component can be monitored by placing on the a probe connected to a monitoring device that will cut reversibly the current feeding it. This solution is not compatible with the authorized costs for large series.
  • the present invention therefore proposes to remedy the disadvantages mentioned above by implementing a thermal auto-switch in series with said electronic component to be protected.
  • the thermal switch intended to equip the circuit power supply of an electronic component is characterized in that it includes circuit breaker means sensitive to the temperature of the electronic component.
  • the circuit breaker means are removable.
  • the switch comprises a housing comprising two separate conductive elements connected at one of their ends to supply circuit, these two conductive elements being connected electrically to each other by conductive hot melt means extending inside the housing, the hot melt means melting at a given control temperature of said electronic component and making then break the electrical continuity between the elements conductors and thus cut off the power supply of said component electronic.
  • the hot-melt means are arranged directly at the contact of the body of the electronic component.
  • the hot-melt means are formed by a blade in metal alloy whose melting point is adapted to said temperature of ordered
  • the blade forming the hot melt means is pressed elastically against two terminals respectively formed to ends extending inside said housing of said elements conductors.
  • the electrical conducting elements lead to the outside of said housing by suitable conductive connection pins to allow their clipping on an integrated circuit board.
  • the housing extends directly above said component electronic.
  • the melting temperature of the hot melt means is chosen lower than the self-ignition temperature of the component electronic device or its support.
  • FIG. 1 there was a printed circuit referenced 1 of a member such as for example the ABS braking control system of a motor vehicle.
  • the circuit 1 comprises different connecting elements and switching links, the connection paths between the elements have not been represented.
  • the circuit includes a connection 2 output to the elements controlled, fuses 3 protecting the lines supplying the organs, either directly, or controlled via relay 6, a connector 4 input of the various signals arriving on the circuit, a microprocessor 5 managing the various orders arriving on the map through the connections power relays 6 controlled by the microprocessor 5, components electronic 7 performing an electronic switching, a connector 8 power input.
  • each electronic component 7 is protected by a thermal switch 14.
  • This switch 14 consists of a fuse of a particular type, fixed on the electronic card, in contact with the component 7, this fuse coming to permanently cut the supply current of the latter in case of significant heating of the component 7.
  • FIG. 2 there is shown the track 10 feeding the protected component 7, upstream of the switch 14, the track 11 feeding the protected component 7, downstream of the switch 14, the track 12 coming out of the component 7, the track 13 controlling the protected component 7.
  • FIG. 3 details an embodiment of the thermal switch 14 according to the invention.
  • This switch 14 comprises a housing 25 on which two conductive elements 20a and 20b are attached to connect said component to the circuit board 1 and to connect the feed track 10 to the track 11.
  • These conductive elements are, for example, pins of the Press-Fit type. These pins 20a and 20b are fixed in corresponding tabs 21a and 21b of the housing 25. Between the free ends of the pins 20a and 20b extending inside the housing 25 is positioned a blade 22 in hot-melt material, melting at a suitable temperature for example 150 ° C.
  • the blade 22 is fixed by connections 24 with the pins and rests at rest on studs 23 carried by the casing 25 and coming from molding with this last, these pads holding the blade 22 sensitive hot melt.
  • the springs 26 such as flexible blades mounted between the bottom of the housing 25 and the blade 22 elastically forces the latter towards the outside of the housing 25 through an opening of the latter formed between the two pins.
  • a microprocessor 5 controls relays 6 or power components 7 to power consumers whose most lines coming from connector 2 are protected by fuses 3.
  • Each component 7 receives its power from the track 10, this track bypassing the component 7 by the thermal switch 14 on which it is in mechanical stop by its lower face 27.
  • This track 10 continues in 11, after the switch 14, and spring 12 of the component 7.
  • the component 7 is controlled by the microprocessor 5 by means of the line 13. Track 12 goes directly to connector 2 without going through fuses 3. The fuses 3 are used for the outputs passing through the relay 6 or simply from the power supply 8.
  • the switch 14 is fixed on the circuit 1 thanks to the pins 20a, 20b according to the so-called Press-Fit technique or the transverse elasticity of the pins and that of the circuit board 1 combine to ensure a maintains pin mechanics and an electrical connection. This mechanical maintains allows the lower face 27 of the switch 14 to rely on the component 7 and the outer face 28 of the fuse blade 22 to be in support on the upper face of the component 7.
  • the current supplying the component 7 passes into the blade 22 via the links 24 between spindle and blade.
  • the temperature of its surface rises, and consequently that of the blade 22.
  • the switch 14 automatically adapts to the thickness of component 7 since the surface of the component acts as end stop race and therefore the same type of switch can be used for components of various shapes and thicknesses.

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

Abstract

The switch has a case (25) including two pins (20) that connect an electronic component to a printed circuit. A prong (22) made of thermofusible material is placed between free ends of the pins, and extends inside the case. The prong melts at the component`s temperature of about 150 degree Celsius, for disconnecting electrical continuity between the pins.

Description

La présente invention concerne un commutateur thermique servant à protéger un composant électronique contre un échauffement anormal.The present invention relates to a thermal switch for protect an electronic component against abnormal heating.

La présente invention concerne plus particulièrement un commutateur thermique adapté à sa mise en place sur une carte de circuit imprimée.
Il est connu que dans le domaine des organes électroniques, on note une augmentation régulière des puissances électriques transitant par des cartes électroniques. Ces puissances correspondent à des intensités importantes qui circulent dans les pistes des circuits électroniques.The present invention more particularly relates to a thermal switch adapted to its implementation on a printed circuit board.
It is known that in the field of electronic organs, there is a steady increase in electrical power passing through electronic cards. These powers correspond to important intensities which circulate in the tracks of the electronic circuits.

L'expérience, les calculs et les essais permettent de s'assurer que le dimensionnement de ces pistes est correct et les cartes actuelles ont des comportements homogènes (échauffement) tant pour les composants que pour les pistes.Experience, calculations and tests help to ensure that the sizing of these tracks is correct and current maps have homogeneous behaviors (warming up) for both the components and for the tracks.

Il est connu que tout organe, et particulièrement ses composants, présente des risques de dysfonctionnement couvrant des niveaux de gravité variable. Avec des puissances importantes, le risque majeur présenté par un composant est celui d'un échauffement excessif.It is known that every organ, and particularly its components, presents risks of dysfunction covering varying levels of severity. With significant powers, the major risk presented by a component is that of excessive heating.

Pour les composants de puissance nécessitant un refroidissement spécifique, comme une fixation positive sur un radiateur thermique, le contrôle en fin de fabrication de la température du composant, sollicité au maximum, garantira une quasi-absence de risque en utilisation.For power components requiring specific cooling, as a positive fixation on a thermal radiator, the control at the end of manufacture of the temperature of the component, solicited to the maximum, will guarantee a virtual absence of risk in use.

Par contre pour les composants fonctionnant par commutation et conçus pour protéger également le circuit qu'ils pilotent lorsque qu'un court circuit à la masse apparaít sur la ligne commandée, court circuit franc ou non, il existe un risque plus important. On the other hand, for switching-operated components to also protect the circuit they fly when a short circuit to the mass appears on the commanded line, short circuit franc or not, he There is a greater risk.

En effet, dans ce cas, un échauffement se manifeste dans le composant qui coupe alors le courant et le rétablit ensuite une fois la température normale atteinte à nouveau.Indeed, in this case, a warm-up is manifested in the component that then cuts off the current and then restores it once the normal temperature reached again.

Suivant le type de court circuit et la réalisation du composant, cette coupure et ce rétablissement peuvent se produire de nombreuses fois et la destruction du composant peut intervenir avant que l'utilisateur ne se soit aperçu du dysfonctionnement de l'organe commandé.Depending on the type of short circuit and the realization of the component, this break and this recovery can happen many times and the destruction of the component may occur before the user has overview of the dysfunction of the controlled organ.

La destruction du composant peut prendre alors deux formes: Soit il reste "ouvert", c'est à dire isolé, et le courant est définitivement coupé: L'utilisateur perd la fonction correspondante; soit il reste en position "fermé", ou "presque fermé", il se met alors à chauffer fortement ce qui peut conduire à une destruction de la carte électronique et de son environnement si des précautions ne sont pas prises pour limiter à la source les conséquences de ces échauffements.The destruction of the component can then take two forms: Either it remains "open", ie isolated, and the current is permanently cut: The user loses the corresponding function; either he stays in position "closed", or "almost closed", it then starts to heat up strongly which can lead to a destruction of the electronic map and its environment if precautions are not taken to limit to the source the consequences of these warm-ups.

Il n'est pas non plus possible de mettre un fusible sur le circuit, car le courant conduisant au dysfonctionnement du composant n'est pas forcément susceptible de faire fondre le fusible, que ce dernier soit disposé de façon "interchangeable par le client "ou sur le circuit électronique lui-même, "non interchangeable" par le client. De plus s'il est interchangeable, il faut un support spécifique qui prend de la place et s'il n'est pas interchangeable, la totalité de la pièce est perdue et on perd l'intérêt d'une protection interne de cet élément de commutation.It is also not possible to put a fuse on the circuit, because the current leading to the malfunction of the component is not necessarily fuse the fuse, that the latter is disposed in an "interchangeable way by the customer" or on the electronic circuit itself, "not interchangeable" by the customer. Moreover if it is interchangeable, it need a specific support that takes up space and if it is not interchangeably, the entire coin is lost and the interest of a internal protection of this switching element.

On peut surveiller la température du composant en disposant sur le composant une sonde reliée à un dispositif de surveillance qui coupera de façon réversible le courant l'alimentant. Cette solution n'est pas compatible avec les coûts autorisés pour les grandes séries. The temperature of the component can be monitored by placing on the a probe connected to a monitoring device that will cut reversibly the current feeding it. This solution is not compatible with the authorized costs for large series.

La présente invention se propose donc de remédier aux inconvénients précités en mettant en oeuvre un auto-commutateur thermique en série avec ledit composant électronique à protéger.The present invention therefore proposes to remedy the disadvantages mentioned above by implementing a thermal auto-switch in series with said electronic component to be protected.

Selon l'invention, le commutateur thermique destiné à équiper le circuit d'alimentation électrique d'un composant électronique est caractérisé en ce qu'il comprend des moyens coupe-circuit sensibles à la température du composant électronique.According to the invention, the thermal switch intended to equip the circuit power supply of an electronic component is characterized in that it includes circuit breaker means sensitive to the temperature of the electronic component.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, les moyens coupe-circuit sont amovibles.According to another characteristic of the thermal switch object of the In the present invention, the circuit breaker means are removable.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, le commutateur comprend un boítier comportant deux éléments conducteurs distincts connectés à une de leurs extrémités au circuit d'alimentation, ces deux éléments conducteurs étant reliés électriquement l'un à l'autre par des moyens thermofusibles conducteurs s'étendant à l'intérieur du boítier, les moyens thermofusibles fondant à une température de commande donnée dudit composant électronique et faisant alors en sorte de rompre la continuité électrique entre les éléments conducteurs et donc de couper l'alimentation électrique dudit composant électronique.According to another characteristic of the thermal switch object of the In the present invention, the switch comprises a housing comprising two separate conductive elements connected at one of their ends to supply circuit, these two conductive elements being connected electrically to each other by conductive hot melt means extending inside the housing, the hot melt means melting at a given control temperature of said electronic component and making then break the electrical continuity between the elements conductors and thus cut off the power supply of said component electronic.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, les moyens thermofusibles sont disposés directement au contact du corps du composant électronique.According to another characteristic of the thermal switch object of the the present invention, the hot-melt means are arranged directly at the contact of the body of the electronic component.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, les moyens thermofusibles sont formés par une lame en alliage métallique dont le point de fusion est adapté à ladite température de commande According to another characteristic of the thermal switch object of the the present invention, the hot-melt means are formed by a blade in metal alloy whose melting point is adapted to said temperature of ordered

Selon une autre caractéristique du commutateur thermique objet de la présente invention, la lame formant les moyens thermofusibles est pressée élastiquement à l'encontre de deux bornes formées respectivement aux extrémités s'étendant à l'intérieur dudit boítier desdits éléments conducteurs.According to another characteristic of the thermal switch object of the the present invention, the blade forming the hot melt means is pressed elastically against two terminals respectively formed to ends extending inside said housing of said elements conductors.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, les éléments conducteurs électriques débouchent à l'extérieur dudit boítier par des broches de connexion conductrices adaptées pour permettre leur clipsage sur une plaque de circuit intégré.According to another characteristic of the thermal switch object of the the present invention, the electrical conducting elements lead to the outside of said housing by suitable conductive connection pins to allow their clipping on an integrated circuit board.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, le boítier s'étend directement au-dessus dudit composant électronique.According to another characteristic of the thermal switch object of the the present invention, the housing extends directly above said component electronic.

Selon une autre caractéristique du commutateur thermique objet de la présente invention, la température de fusion des moyens thermofusibles est choisie inférieur à la température d'auto inflammation du composant électronique ou de son support.According to another characteristic of the thermal switch object of the In the present invention, the melting temperature of the hot melt means is chosen lower than the self-ignition temperature of the component electronic device or its support.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant aux dessins annexés, sur lesquels :

  • la Fig. 1 représente une carte électronique et ses composants ;
  • la Fig. 2 représente une vue agrandie d'un élément électronique et son commutateur thermique selon l'invention ;
  • la Fig. 3 est une vue en coupe du commutateur thermique selon l'axe A-A' de la figure 2, avant sa pose sur la carte électronique ;
  • la Fig. 4 est une vue similaire à la Fig. 3, le commutateur thermique étant en place sur la carte électronique la même coupe une fois le fusible en place.
The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which:
  • FIG. 1 represents an electronic card and its components;
  • FIG. 2 represents an enlarged view of an electronic element and its thermal switch according to the invention;
  • FIG. 3 is a sectional view of the thermal switch along the axis AA 'of Figure 2, before its installation on the electronic card;
  • FIG. 4 is a view similar to FIG. 3, the thermal switch being in place on the electronic board the same cut once the fuse in place.

En se reportant sur la figure 1, on a figuré un circuit imprimé référencé 1 d'un organe tel que par exemple le système de contrôle de freinage ABS d'un véhicule automobile. Le circuit 1 comporte différents éléments de liaison et de commutation, les pistes de liaison entre les éléments n'ont pas été représentées.Referring to Figure 1, there was a printed circuit referenced 1 of a member such as for example the ABS braking control system of a motor vehicle. The circuit 1 comprises different connecting elements and switching links, the connection paths between the elements have not been represented.

Le circuit comprend une connectique 2 de sortie vers les éléments commandés, des fusibles 3 protégeant les lignes alimentant les organes, soit directement, soit commandés par l'intermédiaire de relais 6, une connectique 4 d'entrée des différents signaux arrivant sur le circuit, un microprocesseur 5 gérant les différents ordres arrivant sur la carte par la connectique 4, des relais de puissance 6 commandés par le microprocesseur 5, des composants électroniques 7 réalisant une commutation électronique, une connectique 8 d'entrée de puissance.The circuit includes a connection 2 output to the elements controlled, fuses 3 protecting the lines supplying the organs, either directly, or controlled via relay 6, a connector 4 input of the various signals arriving on the circuit, a microprocessor 5 managing the various orders arriving on the map through the connections power relays 6 controlled by the microprocessor 5, components electronic 7 performing an electronic switching, a connector 8 power input.

Conformément à l'invention chaque composant électronique 7 est protégé par un commutateur thermique 14. Ce commutateur 14 consiste en un fusible d'un type particulier, fixé sur la carte électronique, en contact thermique avec le composant 7, ce fusible venant couper définitivement le courant d'alimentation de ce dernier en cas d'échauffement important du composant 7.According to the invention, each electronic component 7 is protected by a thermal switch 14. This switch 14 consists of a fuse of a particular type, fixed on the electronic card, in contact with the component 7, this fuse coming to permanently cut the supply current of the latter in case of significant heating of the component 7.

En se reportant sur la figure 2 on a figuré la piste 10 alimentant le composant protégé 7, en amont du commutateur 14, la piste 11 alimentant le composant protégé 7, en aval du commutateur 14, la piste 12 sortant du composant 7, la piste 13 commandant le composant protégé 7.Referring to FIG. 2, there is shown the track 10 feeding the protected component 7, upstream of the switch 14, the track 11 feeding the protected component 7, downstream of the switch 14, the track 12 coming out of the component 7, the track 13 controlling the protected component 7.

La figure 3 détaille un mode de réalisation du commutateur thermique 14 selon l'invention. Ce commutateur 14 comprend un boítier 25 sur lequel sont fixés deux éléments conducteurs 20a et 20b destinés à connecter ledit composant au circuit imprimé 1 et de relier la piste d'alimentation 10 à la piste 11. Figure 3 details an embodiment of the thermal switch 14 according to the invention. This switch 14 comprises a housing 25 on which two conductive elements 20a and 20b are attached to connect said component to the circuit board 1 and to connect the feed track 10 to the track 11.

Ces éléments conducteurs sont par exemple des broches du type Press-Fit. Ces broches 20a et 20b sont fixées dans des pattes correspondantes 21a et 21b du boítier 25. Entre les extrémités libres des broches 20a et 20b s'étendant à l'intérieur du boítier 25 est positionnée une lame 22 en matériau thermofusible, fondant à une température adaptée par exemple 150°C.These conductive elements are, for example, pins of the Press-Fit type. These pins 20a and 20b are fixed in corresponding tabs 21a and 21b of the housing 25. Between the free ends of the pins 20a and 20b extending inside the housing 25 is positioned a blade 22 in hot-melt material, melting at a suitable temperature for example 150 ° C.

La lame 22 est fixée par des connexions 24 avec les broches et repose au repos sur des plots 23 portés par le boítier 25 et venant de moulage avec ce dernier, ces plots retenant la lame 22 sensible du thermofusible. Des ressorts 26 telles que des lames souples montées entre le fond du boítier 25 et la lame 22 forcent élastiquement cette dernière vers l'extérieur du boítier 25 à travers une ouverture de ce dernier ménagée entre les deux broches.The blade 22 is fixed by connections 24 with the pins and rests at rest on studs 23 carried by the casing 25 and coming from molding with this last, these pads holding the blade 22 sensitive hot melt. of the springs 26 such as flexible blades mounted between the bottom of the housing 25 and the blade 22 elastically forces the latter towards the outside of the housing 25 through an opening of the latter formed between the two pins.

Lorsque le commutateur 14 est mis en place sur le circuit imprimé 1, cf. figure 4, ce dernier chevauche le composant 7, la lame 22 sous l'action des ressorts 26 venant par sa face extérieure 28 au contact du corps du composant 7.When the switch 14 is put in place on the printed circuit 1, cf. 4, the latter overlaps the component 7, the blade 22 under the action of springs 26 coming through its outer face 28 in contact with the body of the component 7.

Le fonctionnement des commutateurs selon l'invention est alors le suivant. Sur le circuit imprimé 1 alimenté par les connecteurs 8 pour la puissance et 4 pour les signaux, un microprocesseur 5 commande des relais 6 ou des composants de puissance 7 pour alimenter des consommateurs dont la plus-part des lignes issues du connecteur 2 sont protégées par les fusibles 3.The operation of the switches according to the invention is then as follows. On the circuit board 1 powered by the connectors 8 for the power and 4 for the signals, a microprocessor 5 controls relays 6 or power components 7 to power consumers whose most lines coming from connector 2 are protected by fuses 3.

Chaque composant 7 reçoit son alimentation par la piste 10, cette piste contournant le composant 7 par le commutateur thermique 14 sur lequel il est en butée mécanique par sa face inférieure 27. Cette piste 10 continue en 11, après le commutateur 14, et ressort en 12 du composant 7.Each component 7 receives its power from the track 10, this track bypassing the component 7 by the thermal switch 14 on which it is in mechanical stop by its lower face 27. This track 10 continues in 11, after the switch 14, and spring 12 of the component 7.

Le composant 7 est commandé par le microprocesseur 5 au moyen de la ligne 13. La piste 12 va directement vers le connecteur 2 sans passer par les fusibles 3. Les fusibles 3 sont utilisés pour les sorties transitant par les relais 6 ou simplement depuis l'alimentation 8.The component 7 is controlled by the microprocessor 5 by means of the line 13. Track 12 goes directly to connector 2 without going through fuses 3. The fuses 3 are used for the outputs passing through the relay 6 or simply from the power supply 8.

Le commutateur 14 est fixé sur le circuit 1 grâce aux broches 20a, 20b suivant la technique dite de Press-Fit ou l'élasticité transversale des broches et celle du circuit imprimé 1 se combinent pour assurer un maintient mécanique des broches et une liaison électrique. Ce maintient mécanique permet à la face inférieure 27 du commutateur 14 de s'appuyer sur le composant 7 et à la face extérieure 28 de la lame fusible 22 d'être en appui sur la face supérieure du composant 7.The switch 14 is fixed on the circuit 1 thanks to the pins 20a, 20b according to the so-called Press-Fit technique or the transverse elasticity of the pins and that of the circuit board 1 combine to ensure a maintains pin mechanics and an electrical connection. This mechanical maintains allows the lower face 27 of the switch 14 to rely on the component 7 and the outer face 28 of the fuse blade 22 to be in support on the upper face of the component 7.

La lame fusible souple 22, retenue à l'état libre par les plots 23 et poussée par les ressorts 26 s'appuie alors sur la surface supérieure du composant 7. Grâce à ses formes centrales et latérales qui lui confèrent une certaine souplesse dans un sens vertical, la lame vient en contact mécanique et thermique avec le composant 7 sur lequel les ressorts 26 la maintiennent plaquée. Un espace existe entre le corps du commutateur et le circuit imprimé pour absorber différentes épaisseurs de composant 7.The flexible fuse blade 22, retained in the free state by the studs 23 and thrust by the springs 26 then rests on the upper surface of the component 7. Thanks to its central and lateral forms that give it a certain flexibility in a vertical direction, the blade comes into mechanical contact and with the component 7 on which the springs 26 hold it plated. A space exists between the body of the switch and the circuit printed to absorb different thicknesses of component 7.

Le courant alimentant le composant 7 passe dans la lame 22 par les liaisons 24 entre broche et lame. Lorsque le composant 7 se trouve défaillant, la température de sa surface monte, et par voie de conséquence celle de la lame 22.The current supplying the component 7 passes into the blade 22 via the links 24 between spindle and blade. When the component 7 is faulty, the temperature of its surface rises, and consequently that of the blade 22.

En utilisant pour cette lame fusible un métal fondant en dessous du point d'auto inflammation du circuit 1 et suffisamment au-dessus du point de fonctionnement maxi du composant 7, le ruban fusible va fondre et interrompre ainsi le courant alimentant le composant avant de provoquer une plus grande destruction.By using for this fuse blade a metal melting below the point self-ignition circuit 1 and sufficiently above the point of maximum functioning of the component 7, the fuse tape will melt and interrupt the current supplying the component before provoking greater destruction.

Ainsi, c'est le contact thermique direct avec le composant 7 que l'on surveille et le commutateur 14 qui met sensiblement à la même température le composant 7 et l'élément thermofusible 22 du commutateur thermique. En cas d'élévation anormale de la température du composant ou de son support, l'élément sensible fond et interrompt définitivement le courant l'alimentant.Thus, it is the direct thermal contact with the component 7 that is monitored and the switch 14 which puts at substantially the same temperature the component 7 and the hot-melt element 22 of the thermal switch. In abnormal rise in the temperature of the component or its support, the sensitive element melts and interrupts definitively the current the feeding.

Il est à noter que le commutateur 14 s'adapte automatiquement à l'épaisseur du composant 7 puisque la surface du composant fait office de butée de fin de course et donc qu'un même type commutateur peut être utilisé pour des composants de formes et d'épaisseurs diverses.It should be noted that the switch 14 automatically adapts to the thickness of component 7 since the surface of the component acts as end stop race and therefore the same type of switch can be used for components of various shapes and thicknesses.

Claims (7)

Commutateur thermique destiné à équiper le circuit d'alimentation électrique d'un composant électronique, caractérisé en ce qu'il comprend des moyens coupe-circuit sensibles à la température dudit composant électronique, lesdits moyens comprenant un boítier comportant deux éléments conducteurs distincts connectés à une de leurs extrémités audit circuit d'alimentation, ces deux éléments conducteurs étant reliés électriquement l'un à l'autre par des moyens thermofusibles conducteurs s'étendant à l'intérieur dudit boítier et disposés directement au contact du corps dudit composant électronique, lesdits moyens thermofusibles fondant à une température de commande donnée dudit composant électronique et faisant alors en sorte de rompre la continuité électrique entre lesdits éléments et donc de couper l'alimentation électrique dudit composant électronique.Thermal switch intended to equip the electrical supply circuit of an electronic component, characterized in that it comprises circuit-breaking means sensitive to the temperature of said electronic component, said means comprising a housing comprising two distinct conducting elements connected to a their ends to said supply circuit, these two conductive elements being electrically connected to one another by conductive hot melt means extending inside said housing and disposed directly in contact with the body of said electronic component, said means hot melt melting at a given control temperature of said electronic component and then making sure to break the electrical continuity between said elements and thus cut off the power supply of said electronic component. Commutateur thermique selon la revendication 1, caractérisé en ce que lesdits moyens thermofusibles sont formés par une lame en alliage métallique dont le point de fusion est adapté à ladite température de commandeThermal switch according to claim 1, characterized in that said hot melt means are formed by a metal alloy blade whose melting point is adapted to said control temperature Commutateur thermique selon la revendication 2, caractérisé en ce que ladite lame est pressée élastiquement à l'encontre de deux bornes formées respectivement aux extrémités s'étendant à l'intérieur dudit boítier desdits éléments conducteurs.Thermal switch according to claim 2, characterized in that said blade is pressed elastically against two terminals respectively formed at the ends extending inside said housing of said conductive elements. Commutateur thermique selon la revendication 1, caractérisé en ce que lesdits éléments conducteurs électriques débouchent à l'extérieur dudit boítier par des broches de connexion conductrice permettant leur clipsage sur une plaque de circuit intégré.Thermal switch according to claim 1, characterized in that said electrical conductor elements open out of said housing by conductive connection pins for clipping onto an integrated circuit board. Commutateur thermique selon la revendication 1, caractérisé en ce que ledit boítier s'étend directement au-dessus dudit composant électronique. Thermal switch according to claim 1, characterized in that said housing extends directly above said electronic component. Commutateur thermique selon la revendication 1, caractérisé en ce que ladite température de fusion desdits moyens thermofusibles est choisie inférieur à la température d'auto inflammation du composant électronique ou de son support.Thermal switch according to claim 1, characterized in that said melting temperature of said hot melt means is chosen to be lower than the autoignition temperature of the electronic component or its support. Commutateur thermique selon la revendication 1, caractérisé en ce que lesdits moyens coupe-circuit sont amovibles.Thermal switch according to claim 1, characterized in that said circuit breaker means are removable.
EP05300032A 2004-02-03 2005-01-13 Thermal switch for an electronic component Withdrawn EP1562208A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0400976A FR2865862B1 (en) 2004-02-03 2004-02-03 THERMAL SWITCH FOR ELECTRONIC COMPONENT.
FR0400976 2004-02-03

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EP1562208A1 true EP1562208A1 (en) 2005-08-10

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FR (1) FR2865862B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH147931A (en) * 1930-08-06 1931-06-30 Abraham Jud Peter Thermal fuse, especially for electrical heating devices such as boilers etc.
US4758876A (en) * 1985-12-04 1988-07-19 Texas Instruments Incorporated Thermal protective device with bimetal for semiconductor devices and the like
EP1079674A1 (en) * 1998-05-15 2001-02-28 Rohm Co., Ltd. Mounting structure for temperature-sensitive fuse on circuit board
JP2003203552A (en) * 2002-01-09 2003-07-18 Matsushita Electric Ind Co Ltd Fuse and method of manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH147931A (en) * 1930-08-06 1931-06-30 Abraham Jud Peter Thermal fuse, especially for electrical heating devices such as boilers etc.
US4758876A (en) * 1985-12-04 1988-07-19 Texas Instruments Incorporated Thermal protective device with bimetal for semiconductor devices and the like
EP1079674A1 (en) * 1998-05-15 2001-02-28 Rohm Co., Ltd. Mounting structure for temperature-sensitive fuse on circuit board
JP2003203552A (en) * 2002-01-09 2003-07-18 Matsushita Electric Ind Co Ltd Fuse and method of manufacture

Also Published As

Publication number Publication date
FR2865862B1 (en) 2008-08-08
FR2865862A1 (en) 2005-08-05

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