EP2126949A1 - Dispositif de déclenchement pour un fusible thermique - Google Patents

Dispositif de déclenchement pour un fusible thermique

Info

Publication number
EP2126949A1
EP2126949A1 EP08708551A EP08708551A EP2126949A1 EP 2126949 A1 EP2126949 A1 EP 2126949A1 EP 08708551 A EP08708551 A EP 08708551A EP 08708551 A EP08708551 A EP 08708551A EP 2126949 A1 EP2126949 A1 EP 2126949A1
Authority
EP
European Patent Office
Prior art keywords
bridge element
actuator
punch
connection
triggered
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
EP08708551A
Other languages
German (de)
English (en)
Other versions
EP2126949B1 (fr
Inventor
Norbert Knab
Georg Schulze-Icking-Konert
Thomas Mohr
Stefan Kotthaus
Nikolas Haberl
Stefan Stampfer
Michael Mueller
Peilei Chen
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2126949A1 publication Critical patent/EP2126949A1/fr
Application granted granted Critical
Publication of EP2126949B1 publication Critical patent/EP2126949B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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

Definitions

  • the invention relates to a triggering device for a thermal fuse, in particular for use in high-current devices.
  • thermal fuse In order to protect electrical modules against overheating, irreversible thermal fuses are required, which interrupt a current-carrying conductor if the ambient temperature is too high (tripping).
  • the thermal fuses are designed in such a way that the tripping temperature is not reached due to a potentially occurring current flow, so that it is ensured that these can not be triggered due to a high current, but only due to an excessively high ambient temperature.
  • a thermal fuse serves to provide an independent shutdown path for electrical modules which are at an excessively high temperature in the module, e.g. due to component failures, short circuits, e.g. due to external influences, malfunctions of insulating materials and the like. safely interrupts the flow of electricity.
  • thermal fuses are usually based on the concept of a fixed spring (eg, soldered leaf spring), in which the fixation dissolves (eg, by melting) at a temperature effect, whereby the thermal fuse is opened by the spring force.
  • a fixed spring eg, soldered leaf spring
  • the fixation dissolves (eg, by melting) at a temperature effect, whereby the thermal fuse is opened by the spring force.
  • a mechanical force is exerted on the connection point, resulting in Quality problems, especially with long operating times in the automotive sector can lead, for example, to a disruption of the solder joint.
  • a trigger device for a thermal fuse includes an actuator configured to actuate at a threshold temperature and a conductive bridge element secured and connected to a terminal region via a fusible link at a junction to conduct current.
  • the connecting element is designed to melt on reaching or exceeding a threshold temperature, so that the bridge element is released when the actuator is triggered by the connecting element in order to interrupt the conduction of the current.
  • the tripping device according to the invention enables reliable triggering when a limit temperature in the vicinity of the tripping device is exceeded. The interruption of a conductor when triggered by the conductor is separated at one or more points by lifting a bridge element, the triggering can be ensured in a particularly reliable manner.
  • the actuator can have a movable punch, in order to lift off the connection region of the bridge element from the connection point when triggered.
  • the actuator may have a fusible element which holds the ram in a non-released position, wherein the material of the fusible body is selected such that it melts upon reaching the limit temperature and thereby triggers the actuator, wherein the punch by a Force, in particular by a spring force, is moved to completely lift the bridge element by means of the punch from the connection points.
  • the actuator may have two mutually insulated enamel bodies, which are arranged as ring segments around the punch.
  • the actuator may comprise a ring-shaped enamel body of an electrically insulating material, which is arranged as a ring around the stamper.
  • the conductive bridge element can be fastened and connected at a plurality of connection regions via corresponding fusible connection elements at corresponding connection points, wherein the bridge element, upon triggering of the actuator, removes the connection regions from the connection. Closure is completely solved to interrupt the passage of the current.
  • the punch can engage through a retaining opening in the bridge element in order to fix the bridge element when lifted from the connection points.
  • the actuator can be designed to move when triggered against a stop plate, so that in the triggered state, the bridge element between the punch and stop plate is held.
  • the conductive bridge element can be arranged pivotably at a further connection point, wherein the actuator is arranged on the bridge element such that the connection region of the bridge element is lifted off the connection point by a path when the actuator is triggered, which becomes larger due to a lever effect is the stroke of the actuator's punch when triggered.
  • This makes it possible to increase the distance by which the connection area is lifted off the connection point. This has the advantage that the connection can be reliably disconnected, since a solder without flux u.U. Draws threads that tear off at an increased stroke.
  • connection region of the bridge element is bent away from the bridge element and is guided through an opening in a contact web.
  • the contact elements are preferably formed of a conductive material, in particular of a fusible metal or metal alloy.
  • a thermal fuse is provided which has an above triggering device, wherein the bridge element is connected to a contacting device, in particular to a stamped grid or to a printed circuit board.
  • FIG. 1 is a cross-sectional view of a trip unit according to a first embodiment of the invention
  • Fig. 2 is a plan view of the triggering device of Fig. 1;
  • Fig. 3 is a perspective view of the actuator used in the embodiment of Fig. 1;
  • 4 is a cross-sectional view of a trip unit according to another embodiment of the invention in an untripped condition;
  • Fig. 5 is a cross-sectional view of a trip unit according to the embodiment of Fig. 4 in a tripped state.
  • tripping device In Fig. 1, the tripping device according to the invention is shown.
  • the triggering device 1 is attached to a stamped grid 2 made of a conductive material, which is surrounded by a sheathing 3 made of a non-conductive plastic material.
  • a stamped grid 2 instead of the stamped grid 2 may also be provided a circuit board or other contacting device.
  • the sheath 3 of the stamped grid 2 is removed, so that the stamped grid 2 is exposed.
  • the exposed part of the stamped grid 2 has two contact webs 4, which project into the recess 5.
  • a bridge element 6, which is conductively connected to two contact webs 4 a Power connection is established, via which an electrical module which is connected to the lead frame 2, is operated.
  • the bridge element 6 has at two opposite ends bent connecting portions 8, which pass through respective openings 9 in the contact webs 4 of the lead frame 2 and is connected at these points by a solder connection 10 with the lead frame 2.
  • the solder connection 10 represents a conductive contact between the bridge element 6 and the respective contact webs 4 of the stamped grid 2.
  • another conductive connection e.g. be provided of a metal or a metal alloy whose melting temperature is equal to or less than the temperature of the triggering.
  • the actuator 11 is generally designed so that it triggers when the ambient temperature of the triggering device 1 exceeds a certain threshold temperature, the punch 19 is moved perpendicular to the main surface of the lead frame 2.
  • the punch 19 has a conically shaped engaging element 13, which projects through a holding opening 14 of the bridge element 6 and rests there. Upon actuation of the actuator 11, the punch 19 moves perpendicular to a main portion of the bridge element 6, wherein the engaging element 13 lifts the bridge element 6 from the lead frame 2, so that the electrical connection between the contact webs 4 is interrupted.
  • the Lotmate- rial of the solder joints 10 is chosen so that it in the
  • Limit temperature at which triggering of the triggering device 1 is to take place melts or is already melted, after which the bridge element 6 can be lifted in a simple manner by the punch 19 of the lead frame 2.
  • desired separation points may be provided in the bridge element 6, at which the bridge element 6 is separated by the force of the punch 19 when the actuator 11 triggers.
  • the bridge element 6 which rests only loosely on the contact webs 4 of the stamped grid 2 after melting, does not detach from it in the case of release and enters the environment where it can possibly cause short circuits, a holding device is provided which holds the bridge element 6 guaranteed.
  • the bridge element lies loosely on the engagement element 13. If the actuator 11 is triggered, the bridge element 6 released by the stamped grid 2 is moved by the stamp 19 in the direction away from the stamped grid 2. In the direction in which the punch 19 of the actuator 11 moves when triggered, opposite the punched grid 2 there is a stop plate 15, which extends substantially parallel to the punched grid 2. against this stop plate 15, the engaging element 13 is moved and Under certain circumstances, pressed, without the bridge element 6 is disengaged from the engagement element 13. In the triggered state, one end of the engagement element 13 abuts against the stop plate 15 and extends through the holding opening 14 of the bridge element 6, so that it is securely held on the stop plate 15.
  • the actuator 11 is configured as described above to trip at a certain ambient temperature.
  • the actuator 11 comprises the punch 19 which is guided in a recess 17 of an actuator housing 16 directed in the direction of movement of the punch 19.
  • a spring element 18 is arranged, which is provided with a sleeve 26.
  • the spring element 18 In the untripped state, the spring element 18 is biased so that a force acts between the punch 19 and the actuator housing 16.
  • the punch 19 is held by fusible element 21 in its position against the spring force.
  • the fusible elements 21 are arranged between a stop edge 22 of the punch 19 and a stop region 25 at the respective ends of the contact webs 4 of the stamped grid 2.
  • the punch 19 is tapered in the region of the melting body 21 so that it can move through the contact webs 4 formed opening of the lead frame 2.
  • the fusible elements 21 are formed of a slightly melting material, such as solder or wax, which melts when triggered and can flow in the molten state through a gap 26 between the respective end of the contact webs 4 and the plunger 19 of the actuator 11 out. In this case, the mechanical resistance between the stop edge 22 of the punch 19 and the detached Stop area 25 of the contact webs 4 and the punch 19 moves in the direction of the stop plate 15th
  • the punch 19 is preferably made of a nonconductive material, such as e.g. Plastic or ceramic to create after triggering no conductive connection between the contact webs 4. He thus prevents further, a short circuit through the spring element
  • a leaf spring may be provided or any other measure, such as. Compressed air, be provided, which exerts a permanent force on the punch 19 in the direction of the fusible element 21 and in the direction of the bridge element 6.
  • the material of the melting body 21 is preferably selected so that no plastic deformation occurs at temperatures below the threshold temperature. This is the case, in particular, when using metals or metal alloys. In this case, however, care must be taken that, when triggered, the molten material of the fusible element 1 does not create a contact between the contact webs 4 instead of the bridge element 6.
  • the two fusible elements 21 shown in the embodiment shown are ring-segment-shaped and are not in contact with each other, so that no random electrical connection can be created over them.
  • the punch 19 stop edges 22 along its circumferential direction, which are not completely circumferential and are separated by the non-conductive material of the punch 19 from each other. Is used instead of a lottery If a non-conductive material, such as wax, is used as the fusible element 21, such a subdivision of the abutment edge 22 is not necessary and the fusible element 21 can also be placed as an annular element around the corresponding section of the stamper Device facilitates.
  • FIGS. 4 and 5 show a trip unit according to a further embodiment of the invention. Like reference numerals correspond to elements of the same or comparable function.
  • the embodiment of Figures 4 and 5 differs from the embodiment of Figures 1 and 2 in that the bridge member 6 is pivotally fixed at one end and remains fixed even when triggered, so that the bridge member moves about the pivot axis thus formed. Furthermore, the embodiment of Figures 4 and 5 differs from the embodiment of Figures 1 and 2 in that it is provided without holding opening. To form the pivot axis, a stop element 30 is provided instead of the stop plate 15, which fixes one end of the bridge element 6 in the opening 9 of the contact web 4, so that it can not be pulled out of the opening 9 during a movement of the punch 19. In the case of triggering, although the connecting element 10 liquefies, however, the stop element 30 prevents the corresponding connection region 8 from being pulled out of the opening 9.
  • the stop member 30 thus defines a pivot axis of the bridge member 6, about which the bridge member 6 is pivoted when the actuator 11 triggers (see Fig. 5).
  • the punch 19 presses against the bridge element 6, so that this is pivoted about the pivot axis.
  • a connection region 8 lying opposite the fixed connection region 8 is pulled out of the opening 9 in the corresponding contact web 4 and, depending on the stroke of the stamp 19, offset by a defined path length.
  • the punch 19 acts on the bridge element 6 between the two connection areas, so that, due to a lever action, the path by which the connection area 8 is pulled out of the corresponding opening 9 is greater than the stroke which the plunger 19 travels when the actuator 11 is triggered ,
  • the connection area is offset from the corresponding opening by a distance which corresponds approximately to twice the stroke length of the punch 19. In this way, the current-conducting connection formed by the bridge element 6 can be reliably interrupted by separating the connection region 8 and the connection element 10 or the contact land 4 with a large distance from one another.
  • connection region 8 and the connection point 10 can be reliably separated from one another in order to achieve an interruption of the current flow through the bridge element 6.
  • the first terminal portion 8 can also be fixed by a broadening on the actuator 11 facing side of the contact web 4 on the contact web 4.
  • the fixation causes solve the actuator 11, the connection portion 8 can not be pulled out of the corresponding opening 9, so that a pivot axis of the bridge element 6 is defined at the corresponding opening 9 of the contact web 4.

Landscapes

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

Abstract

L'invention concerne un dispositif de déclenchement (1) pour un fusible thermique, comportant un actionneur (11) conçu pour réaliser un déclenchement à une température limite, et un élément pont conducteur (6) fixé et connecté exclusivement au moyen d'éléments de connexion amovibles (10) à plusieurs zones de connexion (9), afin de guider un courant. Les éléments de connexion (10) détachent entièrement l'élément pont (6) en cas d'atteinte ou de dépassement d'une température limite de telle manière que l'élément pont est détaché des éléments de connexion (10) lors du déclenchement de l'actionneur (11), afin d'interrompre la conduction du courant.
EP08708551.0A 2007-03-26 2008-02-01 Dispositif de déclenchement pour un fusible thermique Not-in-force EP2126949B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007014336.4A DE102007014336B4 (de) 2007-03-26 2007-03-26 Auslösevorrichtung für eine Thermosicherung und eine Thermosicherung
PCT/EP2008/051241 WO2008116680A1 (fr) 2007-03-26 2008-02-01 Dispositif de déclenchement pour un fusible thermique

Publications (2)

Publication Number Publication Date
EP2126949A1 true EP2126949A1 (fr) 2009-12-02
EP2126949B1 EP2126949B1 (fr) 2016-06-29

Family

ID=39434087

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08708551.0A Not-in-force EP2126949B1 (fr) 2007-03-26 2008-02-01 Dispositif de déclenchement pour un fusible thermique

Country Status (6)

Country Link
US (1) US20100231347A1 (fr)
EP (1) EP2126949B1 (fr)
JP (1) JP2010522419A (fr)
CN (1) CN101647082B (fr)
DE (1) DE102007014336B4 (fr)
WO (1) WO2008116680A1 (fr)

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DE102007014339A1 (de) * 2007-03-26 2008-10-02 Robert Bosch Gmbh Thermosicherung für den Einsatz in elektrischen Modulen
DE102009042916A1 (de) * 2009-09-24 2011-04-07 Dbk David + Baader Gmbh Schmelzsicherung
DE202010009326U1 (de) * 2010-06-21 2011-10-20 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Schmelzsicherung zur Unterbrechung einer gebrückten Unterbrechungsstelle im Stromkreis eines elektrischen Gerätes
DE102010038066B4 (de) * 2010-08-06 2012-05-03 Phoenix Contact Gmbh & Co. Kg Thermische Überlastschutzanordnung
DE102011084593A1 (de) * 2011-10-17 2013-04-18 Robert Bosch Gmbh Stromtrennvorrichtung
WO2013082711A1 (fr) * 2011-12-06 2013-06-13 Magna Closures Inc. Éléments pour mécanisme de sécurité active pour des piétons
JP5682586B2 (ja) 2012-03-22 2015-03-11 豊田合成株式会社 発光装置
US9443683B2 (en) * 2012-04-24 2016-09-13 Commscope Technologies Llc RF thermal fuse
CN103036204B (zh) * 2012-12-03 2015-04-01 昆明绿电科技有限公司 光伏汇流箱双模式自动触发防火保护装置
US9490093B2 (en) * 2013-07-12 2016-11-08 Eaton Corporation Fuse and trip mechanism therefor
US9704662B2 (en) 2013-10-29 2017-07-11 Honeywell International Inc. Switch system with high temperature operating plunger
US10319545B2 (en) 2016-11-30 2019-06-11 Iskra Za{hacek over (s)}{hacek over (c)}ite d.o.o. Surge protective device modules and DIN rail device systems including same
US10447026B2 (en) 2016-12-23 2019-10-15 Ripd Ip Development Ltd Devices for active overvoltage protection
US10707678B2 (en) 2016-12-23 2020-07-07 Ripd Research And Ip Development Ltd. Overvoltage protection device including multiple varistor wafers
US10340110B2 (en) 2017-05-12 2019-07-02 Raycap IP Development Ltd Surge protective device modules including integral thermal disconnect mechanisms and methods including same
US10685767B2 (en) 2017-09-14 2020-06-16 Raycap IP Development Ltd Surge protective device modules and systems including same
TWI676201B (zh) * 2018-07-03 2019-11-01 易湘雲 熱破壞斷電的開關及具有該開關的插座
DE102018118247B3 (de) * 2018-07-17 2019-09-19 Borgwarner Ludwigsburg Gmbh Thermische Sicherung
US11223200B2 (en) 2018-07-26 2022-01-11 Ripd Ip Development Ltd Surge protective devices, circuits, modules and systems including same
US11862967B2 (en) 2021-09-13 2024-01-02 Raycap, S.A. Surge protective device assembly modules
US11723145B2 (en) 2021-09-20 2023-08-08 Raycap IP Development Ltd PCB-mountable surge protective device modules and SPD circuit systems and methods including same
US11990745B2 (en) 2022-01-12 2024-05-21 Raycap IP Development Ltd Methods and systems for remote monitoring of surge protective devices

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Also Published As

Publication number Publication date
DE102007014336A1 (de) 2008-10-02
US20100231347A1 (en) 2010-09-16
EP2126949B1 (fr) 2016-06-29
JP2010522419A (ja) 2010-07-01
CN101647082B (zh) 2013-01-30
DE102007014336B4 (de) 2018-09-06
WO2008116680A1 (fr) 2008-10-02
CN101647082A (zh) 2010-02-10

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