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DE3930819A1 - Safety fuse with spring arm - comprises portion holding two ends of conductor apart against return force of spring - Google Patents

Safety fuse with spring arm - comprises portion holding two ends of conductor apart against return force of spring

Info

Publication number
DE3930819A1
DE3930819A1 DE19893930819 DE3930819A DE3930819A1 DE 3930819 A1 DE3930819 A1 DE 3930819A1 DE 19893930819 DE19893930819 DE 19893930819 DE 3930819 A DE3930819 A DE 3930819A DE 3930819 A1 DE3930819 A1 DE 3930819A1
Authority
DE
Germany
Prior art keywords
spring
bent
spring wire
fuse
fuse 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.)
Ceased
Application number
DE19893930819
Other languages
German (de)
Inventor
Franz Altmann
Alfred Wimmer
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
Priority claimed from DE3825897A external-priority patent/DE3825897A1/en
Application filed by Siemens AG filed Critical Siemens AG
Priority to DE19893930819 priority Critical patent/DE3930819A1/en
Publication of DE3930819A1 publication Critical patent/DE3930819A1/en
Ceased legal-status Critical Current

Links

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

Landscapes

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

Abstract

A fuse, mountable on a chip substrate, comprises a bent around flexible conductor (1) having both ends (3,4) connected to contact terminals of the circuit. One end (4) is bent backwards and thenm at right angles outwards towards the other end (3). This forms a cutting out arrangement (2) which holds the two ends apart against the returning force of the flexible conductor spring. The cutting out arrangement can be formed by appropriate bending of the conductor wire or can be formed from a separate part. USE/ADVANTAGE - Protects against overheating, simple to use and mount onto chip. Can be automatically mass produced. Compact, small and light.

Description

Die Erfindung betrifft eine an einem Schaltungssubstrat fixierbare Schmelzsicherung gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a on a circuit substrate fixable fuse according to the preamble of Claim 1.

Solche Sicherungen werden benötigt, um Schaltungsteile insbe­ sondere von Schichtschaltungen, wie z. B. Schichtwiderstände, vor thermischer Überlastung zu schützen. Zu diesem Zweck wird die Kontaktfläche des Substrates, mit der der Federarm verlötet ist, so angeordnet, daß zwischen dem gegen thermische Überla­ stung zu sichernden Schaltungsteil der Schichtschaltung und dem zur Verbindung des Federarmes mit der Kontaktfläche verwendeten Lot ein möglichst guter Wärmekontakt vorhanden ist. Bei geeig­ neter Wahl des Lotes erweicht dieses, bevor der zu schützende Schaltungsteil durch Überhitzung Schaden nehmen kann. Der vor­ gespannte Federarm kommt dadurch frei und kann eine elektrische Verbindung zwischen der Kontaktfläche und dem Federarm unter­ brechen, indem er den Bereich der Kontaktfläche verläßt.Such fuses are needed to esp. Circuit parts special of layer circuits, such as. B. sheet resistors, to protect against thermal overload. For this purpose the contact surface of the substrate with which the spring arm is soldered is arranged so that between the against thermal overload circuit part of the layer circuit to be secured and the used to connect the spring arm to the contact surface The best possible thermal contact is available. At approve The choice of solder softens this before the one to be protected Circuit part can be damaged by overheating. The before This releases the tensioned spring arm and can be an electric one Connection between the contact surface and the spring arm below break by leaving the area of the contact surface.

Aufgabe vorliegender Erfindung ist es, eine Schmelzsicherung der eingangs genannten Art so auszubilden, daß sie unkompli­ ziert gehandhabt und auf einfache Weise in eine Substratschal­ tung eingelötet werden kann.The object of the present invention is to provide a fuse of the type mentioned in such a way that they are uncomplicated gracefully handled and easily in a substrate scarf device can be soldered.

Diese Aufgabe wird erfindungsgemäß durch die im Patentanspruch 1 angegebenen Merkmale gelöst.This object is achieved by the claim 1 specified features solved.

Die erfindungsgemäße Schmelzsicherung ist schüttgut- und automatenfreundlich.The fuse according to the invention is bulk and machine-friendly.

Die erfindungsgemäße Schmelzsicherung weist eine sehr geringe Bauhöhe auf. Des weiteren ist sie reflowlötfähig.The fuse according to the invention has a very low level  Overall height. Furthermore, it is reflow solderable.

Im folgenden wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispieles beschrieben.In the following the invention based on one in the drawing illustrated embodiment described.

In den Fig. 1 bis 8 sind verschiedene Bauformen der Schmelz­ sicherung dargestellt. In Fig. 9 ist die erfindungsgemäße Schmelzsicherung mit ihrer Abstützeinrichtung dargestellt.In Figs. 1 to 8, various constructions of the melt are shown assurance. In Fig. 9 the fuse according to the invention is shown with its support device.

Die erfindungsgemäße Schmelzsicherung besteht aus einem Federdraht-Biegeteil. Dabei sind die Abmessungen und das Material für das Federdraht-Biegeteil so zu wählen, daß z. B. der ebene Modul und die Wärmeleitfähigkeit das einseitige Ablösen der Schmelzsicherung von einer zugeordneten Kontakt­ fläche ermöglichen, und daß der Federweg für eine galvanische Trennung mit Sicherheitsabstand von dieser Kontaktfläche ausreicht.The fuse according to the invention consists of a Spring wire bent part. Here are the dimensions and that To choose material for the spring wire bent part so that, for. B. the flat module and the thermal conductivity the one-sided Detachment of the fuse from an assigned contact allow surface, and that the travel for a galvanic Separation at a safe distance from this contact surface is sufficient.

Im einzelnen ist den Figuren zu entnehmen, daß die Schmelz­ sicherung durch das Zusammenbiegen eines Federdrahtes-Biege­ teils erzeugt wird.In detail, it can be seen from the figures that the enamel securing by bending a spring wire bend partly generated.

In den Fig. 1 und 2 ist das Biegeteil im wesentlichen kreisförmig, in den Fig. 3 bis 5 im wesentlichen mäander­ förmig zusammengebogen. Einige andere Ausführungsformen sind in den Fig. 6 bis 8 dargestellt.In Figs. 1 and 2, the bending portion is substantially circular, bent together in Figs. 3 to 5 substantially meander-shaped. Some other embodiments are shown in Figs. 6-8.

In Fig. 9 ist das Federdraht-Biegeteil 1 dargestellt, dessen beide gegenüber liegende Enden 3 und 4 mit in der Zeichnung nicht dargestellten Kontaktflächen verlötbar sind. Das eine Ende 4 des Federdraht-Biegeteils 1 ist nach rückwärts und dann im wesentlichen parallel zu einer gedachten Verbindungslinie der Enden 3 und 4 verbogen. Hierdurch entsteht eine Abstütz­ einrichtung 2, die die beiden Enden 3 und 4 auseinanderhält. Zur besseren Anlage der Abstützeinrichtung 2 am freien Ende 3 des Federdraht-Biegeteils 1 ist der Draht beispielsweise senkrecht zur gedachten Verbindungslinie (der Enden 3 und 4) und senkrecht zum Drahtteil 1 nach oben oder unten abgewinkelt.In Fig. 9, the spring wire bent part 1 is shown, the two opposite ends 3 and 4 of which can be soldered to contact surfaces not shown in the drawing. One end 4 of the spring wire bending part 1 is bent backwards and then essentially parallel to an imaginary connecting line of the ends 3 and 4 . This creates a support device 2 , which holds the two ends 3 and 4 apart. To better support the support device 2 at the free end 3 of the spring wire bent part 1 , the wire is, for example, angled upwards or downwards perpendicularly to the imaginary connecting line (ends 3 and 4 ) and perpendicularly to the wire part 1 .

Wesentlich ist, daß die Abstützeinrichtung 2 entgegen der Rückstellkraft des Federdraht-Biegeteils 1 die beiden Enden 3 und 4 auseinanderhält. Die Abstützeinrichtung 2 kann hierzu, wie vorstehend beschrieben, durch entsprechendes Umbiegen des Drahtes, aus dem das Federdraht-Biegeteil 1 gebogen ist, gebildet werden. Die Abstützeinrichtung 2 kann auch durch andere eingespannte Teile gebildet werden.It is essential that the support device 2 holds the two ends 3 and 4 apart against the restoring force of the spring wire bent part 1 . For this purpose, the support device 2 can, as described above, be formed by appropriately bending the wire from which the spring wire bending part 1 is bent. The support device 2 can also be formed by other clamped parts.

Nach dem Entfernen der Abstützeinrichtung 2, beispielsweise durch Verbiegen über die Elastizitätsgrenze hinaus oder durch Abschneiden, federn die beiden Enden 3 und 4 zusammen.After removal of the support device 2 , for example by bending beyond the elastic limit or by cutting, the two ends 3 and 4 spring together.

Wenn das Federdraht-Biegeteil 1 als Schmelzsicherung auf dem Substrat verlötet ist, sind die beiden Enden 3 und 4 mit Kontaktflächen verlötet. Nach dem Schärfen der Schmelzsiche­ rung, d. h. beispielsweise nach dem Entfernen der Abstützein­ richtung 2, wird beim Auslösen der Sicherung, d. h. beim Erweichen des Lotes an einem der Enden 3 oder 4 dieses Ende freigegeben. Hierdurch wird der Kontakt dieses Endes mit der Kontaktfläche unterbrochen.If the spring wire bent part 1 is soldered to the substrate as a fuse, the two ends 3 and 4 are soldered to contact surfaces. After sharpening the fuse, ie, for example after removing the support device 2 , this end is released when the fuse is triggered, ie when the solder softens at one of the ends 3 or 4 . As a result, the contact of this end with the contact surface is interrupted.

Claims (5)

1. An einem Schaltungssubstrat fixierbare Schmelzsicherung gemäß Hauptanmeldung DE-P 38 25 897.8, gekennzeichnet durch ein zusammengebogenes Federdraht-Biegeteil (1), eine Abstützeinrichtung (2), die die beiden gegenüberliegenden Enden (3, 4) des Federdraht-Biegeteils (1) entgegen der Federspannung in einen gespreizten Zustand hält.1. On a circuit substrate fixable fuse according to the main application DE-P 38 25 897.8, characterized by a bent spring wire bent part ( 1 ), a support device ( 2 ), the two opposite ends ( 3 , 4 ) of the spring wire bent part ( 1 ) holds against the spring tension in a spread state. 2. Schmelzsicherung nach Anspruch 1, dadurch gekennzeichnet, daß die Abstützeinrichtung (2) ein entsprechend umgebogenes Teilstück an mindestens einem Ende des Federdraht-Biegeteils (1) ist.2. A fuse according to claim 1, characterized in that the support device ( 2 ) is a correspondingly bent section on at least one end of the spring wire bent part ( 1 ). 3. Schmelzsicherung nach Anspruch 1 oder 2, dadurch gekennzeichnet, das das Federdraht-Biegeteil (1) im wesentlichen kreisförmig gebogen ist.3. A fuse according to claim 1 or 2, characterized in that the spring wire bent part ( 1 ) is bent substantially circular. 4. Schmelzsicherung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Federdraht-Biegeteil (1) im wesentlichen mäanderförmig gebogen ist.4. A fuse according to claim 1 or 2, characterized in that the spring wire bent part ( 1 ) is bent substantially in a meandering shape. 5. Schmelzsicherung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Federdraht-Bieteteil (1) im wesentlichen rechteckförmig gebogen ist.5. Fuse according to claim 1 or 2, characterized in that the spring wire bidding part ( 1 ) is bent substantially rectangular.
DE19893930819 1988-07-29 1989-09-14 Safety fuse with spring arm - comprises portion holding two ends of conductor apart against return force of spring Ceased DE3930819A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19893930819 DE3930819A1 (en) 1988-07-29 1989-09-14 Safety fuse with spring arm - comprises portion holding two ends of conductor apart against return force of spring

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3825897A DE3825897A1 (en) 1988-07-28 1988-07-29 MELT LOCK WITH SPRING ARM
DE19893930819 DE3930819A1 (en) 1988-07-29 1989-09-14 Safety fuse with spring arm - comprises portion holding two ends of conductor apart against return force of spring

Publications (1)

Publication Number Publication Date
DE3930819A1 true DE3930819A1 (en) 1991-03-28

Family

ID=25870660

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19893930819 Ceased DE3930819A1 (en) 1988-07-29 1989-09-14 Safety fuse with spring arm - comprises portion holding two ends of conductor apart against return force of spring

Country Status (1)

Country Link
DE (1) DE3930819A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4209542A1 (en) * 1992-03-24 1993-09-30 Roederstein Kondensatoren Thermal overload protection in SMD design
US5600295A (en) * 1992-06-15 1997-02-04 Siemens Aktiengesellschaft Thermal fuse and method for the activation thereof
WO1997030463A1 (en) * 1996-02-13 1997-08-21 Braun Aktiengesellschaft Safety device
EP1003190A2 (en) * 1998-11-17 2000-05-24 Braun GmbH Water heater for heating water
DE102005014601A1 (en) * 2005-03-31 2006-10-05 Conti Temic Microelectronic Gmbh Electronic module
FR2914108A1 (en) * 2007-03-21 2008-09-26 Peugeot Citroen Automobiles Sa Thermal fuse for electronic case of motor vehicle, has contact part released from contact with polarization path by releasing stress of spring during raise of temperature above fusion temperature, to interrupt electrical connection on path
WO2011054565A1 (en) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Electronic component
US8665057B2 (en) 2005-03-31 2014-03-04 Conti Temic Microelectronic Gmbh Electronic assembly having stressable contact bridge with fuse function
US9476398B2 (en) 2013-06-03 2016-10-25 Magna Electronics Inc. Control device for a vehicle
US9670895B2 (en) 2012-05-07 2017-06-06 Magna Electronics, Inc. Control device for a vehicle
US9890760B2 (en) 2014-07-29 2018-02-13 Magna Electronics Inc. Control device for a vehicle
US10151292B2 (en) 2016-03-23 2018-12-11 Magna Electronics Inc. Control device with thermal fuse having removable pre-tension element
US10637229B2 (en) 2016-09-02 2020-04-28 Magna Electronics Inc. Electronic fuse module with built in microcontroller and centralized power management bus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1996119U (en) * 1968-08-13 1968-11-07 Microtherm Gmbh TEMPERATURE LIMIT SWITCH.
DE2505871A1 (en) * 1975-02-12 1976-08-26 Draloric Electronic Resistor mounted in bore of former - uses former which has second bore for fuse lead and which is made of plastics material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1996119U (en) * 1968-08-13 1968-11-07 Microtherm Gmbh TEMPERATURE LIMIT SWITCH.
DE2505871A1 (en) * 1975-02-12 1976-08-26 Draloric Electronic Resistor mounted in bore of former - uses former which has second bore for fuse lead and which is made of plastics material

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4209542A1 (en) * 1992-03-24 1993-09-30 Roederstein Kondensatoren Thermal overload protection in SMD design
US5600295A (en) * 1992-06-15 1997-02-04 Siemens Aktiengesellschaft Thermal fuse and method for the activation thereof
WO1997030463A1 (en) * 1996-02-13 1997-08-21 Braun Aktiengesellschaft Safety device
EP1003190A2 (en) * 1998-11-17 2000-05-24 Braun GmbH Water heater for heating water
EP1003190A3 (en) * 1998-11-17 2002-09-25 Braun GmbH Water heater for heating water
US8665057B2 (en) 2005-03-31 2014-03-04 Conti Temic Microelectronic Gmbh Electronic assembly having stressable contact bridge with fuse function
DE102005014601A1 (en) * 2005-03-31 2006-10-05 Conti Temic Microelectronic Gmbh Electronic module
US7864024B2 (en) 2005-03-31 2011-01-04 Conti Temic Microelectronic Gmbh Electronic assembly having spring-loaded contact bridge with fuse function
FR2914108A1 (en) * 2007-03-21 2008-09-26 Peugeot Citroen Automobiles Sa Thermal fuse for electronic case of motor vehicle, has contact part released from contact with polarization path by releasing stress of spring during raise of temperature above fusion temperature, to interrupt electrical connection on path
WO2011054565A1 (en) * 2009-11-06 2011-05-12 Robert Bosch Gmbh Electronic component
US8749940B2 (en) 2009-11-06 2014-06-10 Robert Bosch Gmbh Electronic component
US9670895B2 (en) 2012-05-07 2017-06-06 Magna Electronics, Inc. Control device for a vehicle
US10174738B2 (en) 2012-05-07 2019-01-08 Magna Electronics Inc. Control device for a vehicle
US9476398B2 (en) 2013-06-03 2016-10-25 Magna Electronics Inc. Control device for a vehicle
US9890760B2 (en) 2014-07-29 2018-02-13 Magna Electronics Inc. Control device for a vehicle
US10443560B2 (en) 2014-07-29 2019-10-15 Magna Electronics Inc. Method of manufacturing a control device for a vehicle
US10151292B2 (en) 2016-03-23 2018-12-11 Magna Electronics Inc. Control device with thermal fuse having removable pre-tension element
US10637229B2 (en) 2016-09-02 2020-04-28 Magna Electronics Inc. Electronic fuse module with built in microcontroller and centralized power management bus

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