EP1562208A1 - Thermischer Schalter für ein elektronisches Bauelement - Google Patents

Thermischer Schalter für ein elektronisches Bauelement 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
Authority
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Withdrawn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
Other languages
English (en)
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/de
Withdrawn legal-status Critical Current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.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Thermally Actuated Switches (AREA)
EP05300032A 2004-02-03 2005-01-13 Thermischer Schalter für ein elektronisches Bauelement Withdrawn EP1562208A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0400976 2004-02-03
FR0400976A FR2865862B1 (fr) 2004-02-03 2004-02-03 Commutateur thermique pour composant electronique.

Publications (1)

Publication Number Publication Date
EP1562208A1 true EP1562208A1 (de) 2005-08-10

Family

ID=34673882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05300032A Withdrawn EP1562208A1 (de) 2004-02-03 2005-01-13 Thermischer Schalter für ein elektronisches Bauelement

Country Status (2)

Country Link
EP (1) EP1562208A1 (de)
FR (1) FR2865862B1 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH147931A (de) * 1930-08-06 1931-06-30 Abraham Jud Peter Wärme-Sicherung, insbesondere für elektrische Heizapparate, wie Boiler etc.
US4758876A (en) * 1985-12-04 1988-07-19 Texas Instruments Incorporated Thermal protective device with bimetal for semiconductor devices and the like
EP1079674A1 (de) * 1998-05-15 2001-02-28 Rohm Co., Ltd. Montageanordnung für eine temperaturempfindliche schmelzsicherung auf einer leiterplatte
JP2003203552A (ja) * 2002-01-09 2003-07-18 Matsushita Electric Ind Co Ltd ヒュ−ズ及びその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH147931A (de) * 1930-08-06 1931-06-30 Abraham Jud Peter Wärme-Sicherung, insbesondere für elektrische Heizapparate, wie Boiler etc.
US4758876A (en) * 1985-12-04 1988-07-19 Texas Instruments Incorporated Thermal protective device with bimetal for semiconductor devices and the like
EP1079674A1 (de) * 1998-05-15 2001-02-28 Rohm Co., Ltd. Montageanordnung für eine temperaturempfindliche schmelzsicherung auf einer leiterplatte
JP2003203552A (ja) * 2002-01-09 2003-07-18 Matsushita Electric Ind Co Ltd ヒュ−ズ及びその製造方法

Also Published As

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

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