EP1895548A1 - Resistor device with fuse function, especially for vehicle applicatons - Google Patents

Resistor device with fuse function, especially for vehicle applicatons Download PDF

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Publication number
EP1895548A1
EP1895548A1 EP06123595A EP06123595A EP1895548A1 EP 1895548 A1 EP1895548 A1 EP 1895548A1 EP 06123595 A EP06123595 A EP 06123595A EP 06123595 A EP06123595 A EP 06123595A EP 1895548 A1 EP1895548 A1 EP 1895548A1
Authority
EP
European Patent Office
Prior art keywords
resistor
section
cross
fuse
vehicle
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Withdrawn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
EP06123595A
Other languages
German (de)
English (en)
French (fr)
Inventor
Osvaldo Vettorello
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.)
Ire Industria Resistenze Elettriche Srl
Original Assignee
Ire Industria Resistenze Elettriche Srl
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 Ire Industria Resistenze Elettriche Srl filed Critical Ire Industria Resistenze Elettriche Srl
Publication of EP1895548A1 publication Critical patent/EP1895548A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
    • H01C7/22—Elongated resistive element being bent or curved, e.g. sinusoidal, helical
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/046—Fuses formed as printed circuits
    • 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
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/048—Fuse resistors

Definitions

  • the present invention relates to a resistor with controlled critical point, especially for vehicle applications.
  • the rotational speed of the electrically controlled components installed onboard vehicles, in particular the heat-exchanger fans, is usually controlled by means of resistors connected in series to the motor.
  • control resistor is used to monitor the current absorbed by the motor.
  • the current is usually measured indirectly, by monitoring the reaction at the temperature reached by the resistor of a thermal fuse installed close to said resistor.
  • This type of arrangement is associated with a number of drawbacks, in terms of the number of components and of the checks and verifications that must be carried out on said components and on their anchoring devices.
  • welds must be performed on the assembly board (at least four, two to anchor the fuse and two to anchor the resistor). More welds (at least four) must also be performed during the actual assembly of a resistor of the conventional type.
  • Said board has a complex geometry to allow the various components to be anchored in accessible positions, bearing in mind that they must necessarily be assembled very close together to enable the correct operation of the control function.
  • the purpose of the present invention is to overcome all the drawbacks described above with a resistor with controlled critical point, especially for vehicle applications, the construction of which requires no welding nor the relative verification, that also acts as a fuse and thus entirely eliminates the fuse welds and simplifies the assembly and possibly also the actual geometry of the board.
  • the present invention relates in particular to a resistor with controlled critical point, especially for vehicle applications, as described more fully in the claims, which are an integral part of this description.
  • a resistor is subject to a voltage difference which causes a current to flow through it. Due to the Joule effect along the resistor the electrical energy deposited on the resistor is converted into thermal energy. The latter is transferred to the surrounding environment by means of a series of physical phenomena that range from conduction to radiation.
  • the electrical energy and parallely the thermal energy can be distributed unevenly along the resistive element of the resistor by controlling the cross-section along its path.
  • the thermal resistance towards the surrounding environment can be regulated locally along the resistor to keep specific parts of said resistor at a significantly different temperature with respect to other areas.
  • these two mechanisms are used together to produce a resistor that also acts as a fuse.
  • a resistive element 1 has the form of a Greek fret strip or strap, extending essentially on one plane, with a given cross-section and length. In general the cross-section is small in relation to the length. A portion 2 of the resistive element 1 has a smaller cross-section in order to increase the specific energy dissipated in that part of the resistive element.
  • the radiation dissipation mechanism is extremely non-linear with respect to the temperature, which makes it possible to regulate the maximum current at which the part with the smaller cross-section is interrupted and the time required for the resistor to open after the blocking of the motor, by means of the appropriate dimensioning of the section of the resistive element with the smaller cross-section and the relative cavity 4.
  • the resistor can be produced cheaply, using a construction process based for example on that described in the Italian patent No. 1274441 , the application for which was filed by the same applicant on 5 May 1995, describing a method for the production of resistors, particularly for use in the automotive sector, characterized in that it comprises a step in which at least one essentially flat body extending along an open path is cut from a strip of resistive material, a step in which the ends of the body are folded, a step in which said body, with the exception of the ends, is housed in at least two half-sections made of electrically insulating material, with the interposing of an adhesive material.
  • the method is also characterized in that the body is arranged in a Greek fret design.
  • the method is also characterized in that several bodies are arranged in the two half-sections, said bodies being obtained by cutting a strip of resistive material, arranged so as to mutually overlap and between which a sheet of electrically insulating material is interposed, said bodies forming several resistive sections, which can be connected to one another by their ends which are arranged outside the half bearings.
  • the ceramic casing 3 is suitably shaped to form a cavity 4 in correspondence with the section with the smaller cross-section.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Adjustable Resistors (AREA)
  • Non-Adjustable Resistors (AREA)
  • Details Of Resistors (AREA)
EP06123595A 2006-08-31 2006-11-07 Resistor device with fuse function, especially for vehicle applicatons Withdrawn EP1895548A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI20061663 ITMI20061663A1 (it) 2006-08-31 2006-08-31 Resistore con punto critico controllato,specialmente per applicazioni veicolari

Publications (1)

Publication Number Publication Date
EP1895548A1 true EP1895548A1 (en) 2008-03-05

Family

ID=38337874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06123595A Withdrawn EP1895548A1 (en) 2006-08-31 2006-11-07 Resistor device with fuse function, especially for vehicle applicatons

Country Status (2)

Country Link
EP (1) EP1895548A1 (it)
IT (1) ITMI20061663A1 (it)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08315717A (ja) * 1995-05-11 1996-11-29 Tama Electric Co Ltd ヒューズ抵抗器
FR2778057A1 (fr) * 1998-04-27 1999-10-29 Sofedit Circuit resistif plat et applications de ce circuit
EP1067564A1 (en) * 1999-07-09 2001-01-10 Seima Elettronica S.r.l. Resistor device with fuse function
US20030142453A1 (en) * 2002-01-10 2003-07-31 Robert Parker Low resistance polymer matrix fuse apparatus and method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08315717A (ja) * 1995-05-11 1996-11-29 Tama Electric Co Ltd ヒューズ抵抗器
FR2778057A1 (fr) * 1998-04-27 1999-10-29 Sofedit Circuit resistif plat et applications de ce circuit
EP1067564A1 (en) * 1999-07-09 2001-01-10 Seima Elettronica S.r.l. Resistor device with fuse function
US20030142453A1 (en) * 2002-01-10 2003-07-31 Robert Parker Low resistance polymer matrix fuse apparatus and method

Also Published As

Publication number Publication date
ITMI20061663A1 (it) 2008-03-01

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