EP0352771A2 - Fusible avec bras ressort - Google Patents

Fusible avec bras ressort Download PDF

Info

Publication number
EP0352771A2
EP0352771A2 EP89113794A EP89113794A EP0352771A2 EP 0352771 A2 EP0352771 A2 EP 0352771A2 EP 89113794 A EP89113794 A EP 89113794A EP 89113794 A EP89113794 A EP 89113794A EP 0352771 A2 EP0352771 A2 EP 0352771A2
Authority
EP
European Patent Office
Prior art keywords
bracket
fuse
circuit
spring arms
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.)
Granted
Application number
EP89113794A
Other languages
German (de)
English (en)
Other versions
EP0352771B1 (fr
EP0352771A3 (fr
Inventor
Karl Gerd Drekmeier
Gerhard Winter
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0352771A2 publication Critical patent/EP0352771A2/fr
Publication of EP0352771A3 publication Critical patent/EP0352771A3/fr
Application granted granted Critical
Publication of EP0352771B1 publication Critical patent/EP0352771B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • H01H2001/5888—Terminals of surface mounted devices [SMD]
    • 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
    • H01H2037/046—Bases; Housings; Mountings being soldered on the printed circuit to be protected
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2300/00—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H
    • H01H2300/06—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using tools as locking means
    • H01H2300/066—Orthogonal indexing scheme relating to electric switches, relays, selectors or emergency protective devices covered by H01H using tools as locking means for locking a switch in a test or an "installation" position

Definitions

  • the invention is based on a fuse which can be fixed to a circuit substrate and has at least one spring arm which can be soldered under pretension to a contact surface of the circuit substrate.
  • Such fuses are required to switch circuit parts, in particular of layer circuits, such as Film resistors to protect against thermal overload.
  • the contact surface of the substrate with which the spring arm is soldered is arranged so that the best possible thermal contact is present between the circuit part of the layer circuit to be protected against thermal overload and the solder used to connect the spring arm to the contact surface.
  • the solder softens before the circuit part to be protected can be damaged by overheating.
  • the preloaded spring arm is released and can interrupt an electrical connection between the contact surface and the spring arm by leaving the area of the contact surface.
  • the object of the present invention is to design a fuse of the type mentioned at the outset in such a way that it can be handled easily and soldered into a substrate circuit in a simple manner.
  • this object is achieved in that the spring arm is spread out by a supporting device, which consists of a plastically deformable part of the fuse which thereby eliminates the supporting effect.
  • the spring arm is part of a U or V-shaped bracket and the support device is a strut which is connected to one of the bracket legs and bent against the other bracket leg.
  • the spring arm is spread out by the support of the spring arm on the strut.
  • the bracket can now be easily placed on a substrate and soldered to the free ends of the bracket legs with contact surfaces of the substrate circuit.
  • the strut is then bent beyond the elastic limit of the strut so that the spring arm can soar against the other stirrup leg when the solder used for its fixation is softened, thereby interrupting an electrical connection between the spring arm and the associated contact surface of the substrate circuit.
  • the bracket has two spring arms as bracket legs, that both spring arms are each provided with a support strut, and that the struts are positively and / or non-positively connected to one another in the spread-apart state of the spring arms, that the bracket consists of a flat piece of sheet metal is worked out, with a temple cross piece in the sheet metal plane, while the at the bracket crosspiece, the strip-shaped spring arms are angled with their broad sides against the sheet metal plane by approximately 90 °, and that the support struts are provided at their free ends with a shape suitable for mutual support for the purpose of positive and positive locking.
  • This design of the fuse in coordination with the material parameters advantageously enables a circuit part of the substrate circuit which is exposed to the risk of thermal overload, e.g. to be provided exactly opposite one of the spring arms on the other side of the substrate, so that only one of the two spring arms is released when the associated circuit part has become too warm. This means that the fuse shows which circuit section was in danger of being thermally overloaded.
  • this construction of the fuse makes the manufacture of the bracket particularly simple, in particular the bracket with its cross piece as a stamped and bent part can be connected to further brackets via a sheet metal strip until the respective bracket is separated from the sheet metal strip for storage on a circuit substrate. It is not difficult to provide in particular the crosspiece with such a design that gripping tools can easily grasp the bracket.
  • the fuse consists of a U-shaped bracket 1 which is produced as a stamped and bent part from a flat sheet metal section.
  • the dimensions and the material for the bracket should be selected so that e.g. the modulus of elasticity and the thermal conductivity enable one-sided detachment of a spring arm 4 from an associated contact surface 9 and that the spring travel is sufficient for galvanic separation with a safety distance from the contact surface 9.
  • a crosspiece 3, which connects the stirrup legs 2, remains in the plane of the sheet.
  • the broad sides 4a of the strip-shaped stirrup legs 2, which are also initially located in the sheet metal plane, are angled by 90 ° against the sheet metal plane.
  • Struts 6 are cut free from the two spring arms 4, reducing the width of the spring arms 4 towards the free ends 5, in such a way that the free ends 7 of the struts 6 are located on the side of the free ends 5 of the spring arms 4. It is also possible to extend the spring arms by the struts, the struts having a reduced width compared to the spring arms.
  • the struts 6, which are then bent towards one another, are dimensioned in length in such a way that the struts 6 can be supported with their free ends 7 against one another while the spring arms 5 are spread apart. It is useful to design the free ends 7 of the struts 6 so that a sufficiently large and accordingly e.g. concave / convex shaped support surface for each strut 6 at its free end 7 and thus a secure connection between the struts formed by force and positive locking is obtained.
  • the bracket 1 thus spread out with its spring arms 4 is now, as shown in FIG. 3, placed on the substrate 8 with its U-contour aligned parallel to the surface of a substrate 8.
  • Cross piece 3 and struts 6 are advantageously located on the side of the bracket 1 facing away from the substrate 8. As a result, there is an air gap between the struts 6 and the substrate 8.
  • Contact surfaces 9 of the substrate circuit are provided on the substrate 8 such that each spring arm 4 comes to rest on such a contact surface 9 with its free end 5.
  • the ends 5 of the spring arms 4 are then fixed to the contact surfaces 9 of the brackets 1 on the substrate 8 by surface soldering and are thereby fixed.
  • the struts 6, for example with the help of a stamp that is inserted with its free end into the space between the cross piece 3 and struts 6 and then against the strut ben 6 is moved, bent beyond the elastic limit so that the struts 6 not only no longer support the spring arms, but have such a distance from each other that when softening the solder that has been used to fix the spring arms 4 to the contact surfaces 9 , the corresponding spring arm 4 snap in the direction of the other spring arm 4 and can leave the associated contact surface 9 with its free end 5.
  • the spring action of both spring arms 5 becomes effective because the bracket 1 is now only fixed to the substrate 8 at the end 5 of the other spring arm 4.
  • the spring arm 4 which has become movable due to the softening of the solder, throws parts of the solder used to fix it against this other spring arm 4. This catches the solder, thereby avoiding an undesired uncontrolled distribution of liquid solder over the substrate circuit.
  • a z. B. on the opposite side of the substrate 8 layer resistor 10 is protected against thermal overload in that the resistor 10 softens the solder with increasing heating, which holds the left spring arm 4 with its free end 5 on the contact surface 9.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fuses (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
EP89113794A 1988-07-28 1989-07-26 Fusible avec bras ressort Expired - Lifetime EP0352771B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3825732 1988-07-28
DE3825732 1988-07-28
DE3825897A DE3825897A1 (de) 1988-07-28 1988-07-29 Schmelzsicherung mit federarm
DE3825897 1988-07-29

Publications (3)

Publication Number Publication Date
EP0352771A2 true EP0352771A2 (fr) 1990-01-31
EP0352771A3 EP0352771A3 (fr) 1991-11-13
EP0352771B1 EP0352771B1 (fr) 1995-01-04

Family

ID=25870626

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89113794A Expired - Lifetime EP0352771B1 (fr) 1988-07-28 1989-07-26 Fusible avec bras ressort

Country Status (2)

Country Link
EP (1) EP0352771B1 (fr)
DE (2) DE3825897A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4143095C1 (en) * 1991-12-27 1993-04-08 Roederstein Spezialfabriken Fuer Bauelemente Der Elektronik Und Kondensatoren Der Starkstromtechnik Gmbh, 8300 Landshut, De Electrical building block, for simplicity and reliability - comprises resistor in series with melt fuse and connection element forming protective wall section, fixed on substrate with silicone adhesive
EP0562438A1 (fr) * 1992-03-24 1993-09-29 ROEDERSTEIN SPEZIALFABRIKEN FÜR BAUELEMENTE DER ELEKTRONIK UND KONDENSATOREN DER STARKSTROMTECHNIK GmbH Protecteur thermique du type SMD
DE4219304A1 (de) * 1992-06-12 1993-12-23 Roederstein Kondensatoren Zuverlässiges Überstrom-Schutzbauteil mit geringem Platzbedarf und einfachem Aufbau
WO1993026028A1 (fr) * 1992-06-15 1993-12-23 Siemens Aktiengesellschaft Dispositif de protection thermique et procede pour son activation
DE19814445C1 (de) * 1998-03-31 1999-06-24 Siemens Ag Hybridschaltungsanordnung mit Thermosicherung
WO2000008665A1 (fr) * 1998-07-31 2000-02-17 Tyco Electronics Logistics Ag Composant electrique forme a partir d'une tole et muni d'une butee de soudage, pouvant etre soude sur les surfaces de contact d'un substrat de circuit
FR2914108A1 (fr) * 2007-03-21 2008-09-26 Peugeot Citroen Automobiles Sa Fusible thermique pour boitier electronique et procede d'implantation d'un tel fusible dans un boitier electronique
EP1970932A3 (fr) * 2007-03-14 2010-05-26 Siemens Aktiengesellschaft Dispositif destiné à la surveillance thermique d'un composant
US7911314B2 (en) * 2006-09-01 2011-03-22 Alexander Dauth Electric circuit with thermal-mechanical fuse
WO2011054565A1 (fr) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Composant électronique
EP2284856A3 (fr) * 2009-08-07 2012-04-11 Magna Electronics Europe GmbH & Co. KG Sécurité thermique, notamment pour un module de puissance de véhicule automobile et module de puissance doté d'une telle sécurité thermique

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401125B (de) * 1992-11-05 1996-06-25 Mikroelektronik Ges Mit Beschr Verfahren zur herstellung einer thermosicherung
DE4241311C2 (de) * 1992-12-08 1995-06-08 Phoenix Contact Gmbh & Co Temperaturschalter mit einem Bausteingehäuse
DE4404669A1 (de) * 1994-02-15 1994-09-08 Tech In Gmbh Thermisch schaltbare elektrische Kurzschlußbrücke und Verfahren zu deren Herstellung
DE4413140C2 (de) * 1994-04-19 2001-09-13 Abb Patent Gmbh Elektrisches Installationsgerät
US5612662A (en) * 1995-02-07 1997-03-18 Siemens Aktiengesellschaft Thermal fuse and method for its activation
CN107785731B (zh) * 2016-08-26 2019-05-17 绿色点子公司 导电弹片固定件及插头、插座

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB989428A (en) * 1961-11-08 1965-04-14 Kienzle Uhrenfabriken Ag Safety fuse for electro-magnetically wound apparatus
DE1991022U (de) * 1967-06-27 1968-08-08 Eastman Kodak Company, Rochester, N.Y. (V.St.A.) Stromkreisunterbrecher
US3763454A (en) * 1972-02-22 1973-10-02 Tektronix Inc Thermal switch

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1515624B1 (de) * 1965-08-24 1970-04-09 Vitrohm Gmbh Co Kg Elektrischer Widerstand mit Schmelzsicherung
DE1996119U (de) * 1968-08-13 1968-11-07 Microtherm Gmbh Temperaturbegrenzungsschalter.
DE2505871A1 (de) * 1975-02-12 1976-08-26 Draloric Electronic Elektrischer widerstand mit schmelzsicherung
DE3235366A1 (de) * 1982-09-24 1984-03-29 Harry Dr. 6140 Bensheim Gaus Elektrogeraet mit schutzschalter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB989428A (en) * 1961-11-08 1965-04-14 Kienzle Uhrenfabriken Ag Safety fuse for electro-magnetically wound apparatus
DE1991022U (de) * 1967-06-27 1968-08-08 Eastman Kodak Company, Rochester, N.Y. (V.St.A.) Stromkreisunterbrecher
US3763454A (en) * 1972-02-22 1973-10-02 Tektronix Inc Thermal switch

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4143095C1 (en) * 1991-12-27 1993-04-08 Roederstein Spezialfabriken Fuer Bauelemente Der Elektronik Und Kondensatoren Der Starkstromtechnik Gmbh, 8300 Landshut, De Electrical building block, for simplicity and reliability - comprises resistor in series with melt fuse and connection element forming protective wall section, fixed on substrate with silicone adhesive
EP0562438A1 (fr) * 1992-03-24 1993-09-29 ROEDERSTEIN SPEZIALFABRIKEN FÜR BAUELEMENTE DER ELEKTRONIK UND KONDENSATOREN DER STARKSTROMTECHNIK GmbH Protecteur thermique du type SMD
DE4219304A1 (de) * 1992-06-12 1993-12-23 Roederstein Kondensatoren Zuverlässiges Überstrom-Schutzbauteil mit geringem Platzbedarf und einfachem Aufbau
EP0575783A1 (fr) * 1992-06-12 1993-12-29 ROEDERSTEIN SPEZIALFABRIKEN FÜR BAUELEMENTE DER ELEKTRONIK UND KONDENSATOREN DER STARKSTROMTECHNIK GmbH Pièce électrique
US5363083A (en) * 1992-06-12 1994-11-08 Roederstein Spezialfabriken Fuer Bauelemente Der Elektronik Und Kondensatoren Der Starkstromtechnik Gmbh. Temperature responsive, electric overcurrent protection module
WO1993026028A1 (fr) * 1992-06-15 1993-12-23 Siemens Aktiengesellschaft Dispositif de protection thermique et procede pour son activation
DE19814445C1 (de) * 1998-03-31 1999-06-24 Siemens Ag Hybridschaltungsanordnung mit Thermosicherung
WO1999050871A1 (fr) * 1998-03-31 1999-10-07 Tyco Electronics Logistics Ag Configuration d'un circuit hybride dote d'un declencheur thermique
WO2000008665A1 (fr) * 1998-07-31 2000-02-17 Tyco Electronics Logistics Ag Composant electrique forme a partir d'une tole et muni d'une butee de soudage, pouvant etre soude sur les surfaces de contact d'un substrat de circuit
US7911314B2 (en) * 2006-09-01 2011-03-22 Alexander Dauth Electric circuit with thermal-mechanical fuse
CN101379580B (zh) * 2006-09-01 2011-05-11 贝鲁股份公司 带有热机械保险丝的电路
EP1970932A3 (fr) * 2007-03-14 2010-05-26 Siemens Aktiengesellschaft Dispositif destiné à la surveillance thermique d'un composant
FR2914108A1 (fr) * 2007-03-21 2008-09-26 Peugeot Citroen Automobiles Sa Fusible thermique pour boitier electronique et procede d'implantation d'un tel fusible dans un boitier electronique
EP2284856A3 (fr) * 2009-08-07 2012-04-11 Magna Electronics Europe GmbH & Co. KG Sécurité thermique, notamment pour un module de puissance de véhicule automobile et module de puissance doté d'une telle sécurité thermique
WO2011054565A1 (fr) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Composant électronique
CN102668729A (zh) * 2009-11-06 2012-09-12 罗伯特·博世有限公司 电子元器件
US8749940B2 (en) 2009-11-06 2014-06-10 Robert Bosch Gmbh Electronic component
CN102668729B (zh) * 2009-11-06 2016-08-24 罗伯特·博世有限公司 电子元器件

Also Published As

Publication number Publication date
DE3825897C2 (fr) 1992-02-20
DE58908845D1 (de) 1995-02-16
DE3825897A1 (de) 1990-02-01
EP0352771B1 (fr) 1995-01-04
EP0352771A3 (fr) 1991-11-13

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