EP0516922B1 - Thermische Überlast-Schutzeinrichtung für elektronische Bauelemente - Google Patents

Thermische Überlast-Schutzeinrichtung für elektronische Bauelemente Download PDF

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Publication number
EP0516922B1
EP0516922B1 EP92102812A EP92102812A EP0516922B1 EP 0516922 B1 EP0516922 B1 EP 0516922B1 EP 92102812 A EP92102812 A EP 92102812A EP 92102812 A EP92102812 A EP 92102812A EP 0516922 B1 EP0516922 B1 EP 0516922B1
Authority
EP
European Patent Office
Prior art keywords
bracket
spring
triggering
protection device
overload protection
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.)
Expired - Lifetime
Application number
EP92102812A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0516922A3 (en
EP0516922A2 (de
Inventor
Robert Dr. Hönl
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.)
ADC GmbH
Original Assignee
Krone 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 Krone GmbH filed Critical Krone GmbH
Publication of EP0516922A2 publication Critical patent/EP0516922A2/de
Publication of EP0516922A3 publication Critical patent/EP0516922A3/de
Application granted granted Critical
Publication of EP0516922B1 publication Critical patent/EP0516922B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T1/00—Details of spark gaps
    • H01T1/14—Means structurally associated with spark gap for protecting it against overload or for disconnecting it in case of failure

Definitions

  • the invention relates to a thermal overload protection device for electronic components, in particular for telecommunications and data technology, from a spring-elastic shorting bar and from a melting element, the triggering of the shorting bar depending on the softening of the melting element.
  • a thermal overload protection device of the generic type is previously known from DE 39 21 225 C1.
  • the electronic component consists of a gas-filled, three-pole surge arrester, against the center electrode of which the melting element is pressed under the action of the spring-elastic shorting bar. This comprises two laterally projecting contact fingers, which are kept at a distance from the outer electrodes of the surge arrester. In the event of a prolonged overload, the melting element melts, so that the shorting bar with its two contact fingers directly connects the two outer electrodes connects to the grounded center electrode, whereby the surge arrester is protected from destruction.
  • the thermal overload protection device for electronic components as a so-called FAIL-SAFE protection device
  • the risk of overheating can be reduced, in particular in the case of conventional gas-filled surge arresters.
  • the melting element which can be a solder pill or another, thermally sensitive element, which softens or melts when a limit temperature is reached on the surface of the surge arrester and yields to the short-circuit clip which is under spring force.
  • the spring force in such a thermal overload protection device cannot be chosen to be of any size, since otherwise plastic deformation of the melting element would occur in the operating temperature range and would lead to undesired bridging of the electrodes of the surge arrester.
  • the achievable contact forces between the shorting bar and the electrodes are, however, too low for a surge-proof bridging to be achieved, the nominal discharge current of the surge arrester being regarded as a surge current.
  • the contact finger of the shorting bar can be damaged, as a result of which the FAIL-SAFE device is deactivated and overheating of the surge arrester can occur. that leads to a fire.
  • thermal overload protection device in addition to the gas-filled surge arresters in two- and three-pole design, semiconductor surge protection elements, triac's, thyristors, zener diodes and the like are also. To be called.
  • the invention is therefore based on the object to provide a thermal overload protection device of the generic type, which is improved compared to the known protective device, in particular the contact force of the short-circuit clip pressing against the electrodes of the electronic component to be protected is sufficient in order to generate surge currents transfer.
  • the invention provides in a protective device of the type mentioned at the outset that separate devices for triggering and actuating the shorting bar are provided.
  • the thermal overload protection device is designed as a SERVO-FAIL-SAFE device for electronic components, in particular for telecommunications and data technology, the triggering of the protection device and the bridging of the electrodes being carried out by separate devices.
  • the triggering device works together with the melting element, which is a thermally sensitive element, e.g. is a solder pill.
  • the triggering device works independently of the actuating device for the shorting bar, so that the triggering device is only an auxiliary device for releasing the shorting bar, for which a separate actuating device is provided.
  • the release device consists of a spring-elastic release bracket which is kept at a distance from the electronic component by means of the melting element.
  • the actuating device is formed from a locking element which keeps the short-circuiting bracket at a distance from the electronic component and on which the release bracket engages to release the actuating device.
  • the spring clip which is also spring-elastic, can be a spring of low directivity, which is only used to release the locking element, which in turn releases an almost arbitrarily strong spring in the form of the shorting bar, which can be designed in the pressing force so that the surge current resistance is guaranteed.
  • the two-pole surge arrester 1 shown in FIGS. 1 and 2 comprises two outer electrodes 3, 4 and a fusible element 13, against which a spring clip 6 is pressed under the spring force F in a known manner. If a thermal overload that lasts longer occurs, the melting element 13 softens and assumes the shape shown in FIG. 2. The contact fingers of the spring clip 6 come into contact with the outer electrodes 3, 4 of the surge arrester 1, as a result of which the surge arrester 1 is protected against destruction. It is disadvantageous that the spring force F cannot be selected too large, since otherwise plastic deformation of the melting element 13 can occur in the operating temperature range, which would lead to undesired bridging of the outer electrodes 3, 4. In the usual spring force F, the achievable contact forces between the shorting bar 6 and the outer electrodes 3, 4 are so low, however, that a surge current-proof bridging cannot be achieved.
  • the contact fingers 10, 11 of the shorting bar 6 are held at a distance from the outer electrodes 3, 4 by two tripping bars 16.
  • the trigger bracket 16 press with the spring force K against the melting element 13, which is simultaneously pressed against the surge arrester 1.
  • the spring force K presses the two release brackets 16 inwards, so that the release state shown in FIG. 4 is reached, in which the spring force F of the short-circuit bracket 6 becomes effective unhindered by the two release brackets 16.
  • the two contact fingers 10, 11 contact the outer electrodes 3, 4 with full spring force F.
  • FIGS. 5 to a The embodiment of the thermal overload protection device shown in FIGS. 5 to a is used for a gas-filled, three-pole, cylindrical surge arrester 1.
  • This comprises a center electrode 2, which is connected to the earth in a manner not shown, and two outer electrodes 3, 4, a gas-filled surge chamber 5 with a spark gap is present between the center electrode 2 and each outer electrode 3, 4.
  • This consists of two circularly curved spring clips 7, 8, which enclose the surge arrester 1 by approximately 270 ° and which are arranged at a distance from one another and parallel to one another, a web 9 connecting the free ends of the spring clips 7, 8, which extends in the longitudinal direction of the lateral surface of the Surge arrester 1 is arranged and carries at its ends a contact finger 10, 11, which are assigned to the outer electrodes 3, 4 and are held at a distance from them.
  • the shorting bar 6 comprises at the other end of its two spring clips 7 a foot plate 12 which connects the two spring clips 7, 8 which are at a distance from one another.
  • the release device 15 comprises the circularly curved spring-elastic release bracket 16, which is arranged between the two spring clips 7, 8 of the short-circuit clip 6, is connected to the base plate 12 of the short-circuit clip 6 and is made in one piece from spring material, in particular spring steel, with the short-circuit clip 6.
  • the foot plate 12 of the shorting bar 6 and at the same time the release bar 16 lies on the outer surface of the surge arrester 1 at about 5 o'clock, spans the surge arrester 1 by about 220 ° and stops at the time 11 o'clock a melting element 13 in the form of a solder pill by pressing it against the circumference of the surge arrester 1.
  • the device 17 for actuating the shorting bracket 6 is attached.
  • the device 17 for actuating the shorting bar 6 comprises a locking element 18 corresponding approximately to the width of the release bar 16, which is clamped between the web 9 of the shorting bar 6 and the lateral surface of the surge arrester 1 at approximately 1:30 p.m.
  • the locking element 18, which is designed like a brake block in the side view, has, at its rear end, directed towards the melting element 13, a shoulder 19 of smaller thickness, which is connected to the release bracket 16.
  • the described thermal overload protection device according to FIGS. 5 to 8 works as follows:
  • the trigger bracket 16 designed as a central spring presses against the melting element 13 in the form of a solder pill and holds the locking element 18, which is located between the web 9 of the shorting bar 6 and the circumference of the surge arrester 1.
  • the shorting bar 6 is thus closing his contact fingers 10,11 with the outer electrodes 3,4 prevented.
  • the melting element 13 softens when a limit temperature is reached, which can be achieved if the surge arrester 1 is overloaded, the locking element 18 is displaced tangentially and the shorting bar 6 presses the two contact fingers 10, 11 with its full spring force against the external electrodes 3, 4.
  • the surge arrester 1 is thus protected by a short circuit.
  • the above-described effect of the trigger bracket 16 is due to the fact that under the action of its spring force when the melting element 13 softens, it radially approaches the peripheral surface of the surge arrester 1, its free end 14 moving clockwise from the position 12 o'clock to the position 2 o'clock moved as shown in Fig. 8.
  • the locking element 18 fastened to the free end 14 of the release bracket 16 is moved tangentially, as shown in FIG. 8, so that the locking element 18 disengages from the web 9 and the contact fingers 10, 11 of the shorting bracket 6 now with full spring force can press against the external electrodes 3, 4 of the surge arrester 1.
  • FIG. 8 shows the melting element 13 in the form of the solder pill in the softened or melted state.
  • the further embodiment of the thermal overload protection device shown in FIGS. 9 to 12 is used for a semiconductor protection component 20, for example a thytistor or voltage limiter diode, which has two connecting legs 21, 22 for the a and b lines of a telephone device and a middle one Leg 23 is provided for the ground connection.
  • the component 20 has an insulating effect up to a response voltage. From a certain response voltage, a current begins to flow, the voltage collapsing to a residual voltage in the thyristor diode and a limiting voltage being established in the Z or suppressor diode. In both cases, a power is implemented in connection with the current flow, which can lead to inadmissible heating of the component 20.
  • the semiconductor protection component 20 is surrounded by a one-piece sheet metal housing 24, which consists of a base plate 25, a rear wall 26 and a cover plate 27.
  • a cover plate 27 On the rear wall 26, the rear ends of two lateral shorting bars 6 are attached, on the free ends of which the contact fingers 10, 11 are formed.
  • two trigger brackets 16 At the free end of the cover plate 27, which is held at a distance from the component 20 by means of the melting element 13, two trigger brackets 16 are attached, which in the operating state keep the contact fingers 10, 11 of the shorting brackets 6 at a distance from the connecting legs 21, 22, as shown in FIG 11 shows.
  • the tripping bars 16 disengage from the contact fingers 10, 11 of the shorting bar 16, so that the latter can press with full contact spring force F against the connecting legs 21, 22 in order to lay them on earth.
  • the middle connecting leg 23 is connected to the base plate 25 of the sheet metal housing 24 by means of an earth tab 28.

Landscapes

  • Fuses (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Thermistors And Varistors (AREA)
  • Details Of Resistors (AREA)
  • Lubricants (AREA)
  • Breakers (AREA)
  • Saccharide Compounds (AREA)
  • Protection Of Generators And Motors (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
EP92102812A 1991-06-05 1992-02-20 Thermische Überlast-Schutzeinrichtung für elektronische Bauelemente Expired - Lifetime EP0516922B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4118738A DE4118738C1 (zh) 1991-06-05 1991-06-05
DE4118738 1991-06-05

Publications (3)

Publication Number Publication Date
EP0516922A2 EP0516922A2 (de) 1992-12-09
EP0516922A3 EP0516922A3 (en) 1993-09-01
EP0516922B1 true EP0516922B1 (de) 1994-08-31

Family

ID=6433407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92102812A Expired - Lifetime EP0516922B1 (de) 1991-06-05 1992-02-20 Thermische Überlast-Schutzeinrichtung für elektronische Bauelemente

Country Status (14)

Country Link
US (1) US5248953A (zh)
EP (1) EP0516922B1 (zh)
JP (1) JPH05198243A (zh)
CN (1) CN1067526A (zh)
AT (1) ATE110881T1 (zh)
AU (1) AU650099B2 (zh)
BR (1) BR9202058A (zh)
CA (1) CA2063771A1 (zh)
DE (2) DE4118738C1 (zh)
IE (1) IE920532A1 (zh)
NO (1) NO920672L (zh)
TR (1) TR26437A (zh)
TW (1) TW225605B (zh)
ZA (1) ZA921453B (zh)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3495386B2 (ja) * 1993-06-03 2004-02-09 新光電気工業株式会社 避雷管
SE514854C2 (sv) * 1994-04-12 2001-05-07 Ericsson Telefon Ab L M Anordning för indikering av säkringsfel
DE4437122C2 (de) * 1994-10-01 1996-07-18 Krone Ag Überspannungsschutzstecker
US5596475A (en) * 1995-06-30 1997-01-21 Lucent Technologies Inc. Protector device
DE19708651A1 (de) 1997-02-21 1998-09-03 Siemens Ag Gasgefüllter Überspannungsableiter mit äußerer Kurzschlußeinrichtung
US6094128A (en) * 1998-08-11 2000-07-25 Maida Development Company Overload protected solid state varistors
DE102006036598A1 (de) * 2006-04-26 2007-10-31 Dehn + Söhne Gmbh + Co. Kg Verfahren zur Dimensionierung einer Abtrennvorrichtung für Überspannungsableiter
US8064182B2 (en) * 2007-02-28 2011-11-22 Adc Telecommunications, Inc. Overvoltage protection plug
US7974063B2 (en) * 2007-11-16 2011-07-05 Corning Cable Systems, Llc Hybrid surge protector for a network interface device
DE102007056183B4 (de) * 2007-11-21 2020-01-30 Tdk Electronics Ag Überspannungsableiter mit thermischem Überlastschutz, Verwendung eines Überspannungsableiters und Verfahren zum Schutz eines Überspannungsableiters
DE102008022794A1 (de) * 2008-01-31 2009-08-06 Epcos Ag Elektrisches Schutzbauelement mit Kurzschlusseinrichtung
US7946863B2 (en) * 2008-04-25 2011-05-24 Adc Telecommunications, Inc. Circuit protection block
US8411404B2 (en) * 2008-05-27 2013-04-02 Adc Telecommunications, Inc. Overvoltage protection plug
DE102014103419B4 (de) * 2014-03-13 2018-05-24 Epcos Ag Überspannungsableiter mit Schutz vor Erwärmung
DE202014002496U1 (de) 2014-03-20 2014-04-17 Dehn + Söhne Gmbh + Co. Kg Überspannungsschutzeinrichtung, umfassend mindestens einen Überspannungsableiter und eine dem Überspannungsableiter parallel geschaltete, thermisch auslösbare, federvorgespannte Kurzschliessschalteinrichtung
DE102014116440B4 (de) 2014-11-11 2016-05-19 Epcos Ag Ableiter
DE102015121438B4 (de) * 2015-12-09 2023-12-28 Tdk Electronics Ag Elektrisches Schutzbauelement mit Kurzschlusseinrichtung
DE102017208668A1 (de) 2017-05-22 2018-11-22 Bayerische Motoren Werke Aktiengesellschaft Antriebsstrang mit thermischer Überlastsicherung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1410836A (en) * 1973-03-23 1975-10-22 M O Valve Co Ltd Heat-operated short-circuiting arrangements
DE2634479A1 (de) * 1976-07-31 1978-02-02 Schiederwerk Schieder Kg K Varistor mit schutzvorrichtung gegen thermische ueberlastung
DE3318588A1 (de) * 1983-05-21 1984-11-22 Brown, Boveri & Cie Ag, 6800 Mannheim Varistorsicherungselement
DE3323687C2 (de) * 1983-07-01 1986-12-18 Krone Gmbh, 1000 Berlin Überspannungsableitermagazin für Anschlußleisten der Fernmeldetechnik
US4774558A (en) * 1984-03-05 1988-09-27 Hughes Aircraft Company Thermally-activated, shorting diode switch having non-operationally-alterable junction path
FR2575864B3 (fr) * 1985-01-08 1987-07-10 Nozick Jacques Dispositif de mise en court-circuit pour parasurtension
DE3734214A1 (de) * 1987-10-09 1989-04-20 Dehn & Soehne Anordnung zur abschaltung eines varistors
JPH0227694U (zh) * 1988-08-10 1990-02-22
DE3921225C1 (en) * 1989-06-28 1990-07-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen, De Protective device for distributor in telecommunications system - has over-voltage arrester with wire-type terminal pins, e.g. for telephone exchange
DE9001687U1 (zh) * 1990-02-09 1990-04-12 Krone Ag, 1000 Berlin, De

Also Published As

Publication number Publication date
DE4118738C1 (zh) 1992-12-24
US5248953A (en) 1993-09-28
AU1135192A (en) 1992-12-10
DE59200431D1 (de) 1994-10-06
NO920672D0 (no) 1992-02-20
JPH05198243A (ja) 1993-08-06
ATE110881T1 (de) 1994-09-15
CA2063771A1 (en) 1992-12-06
AU650099B2 (en) 1994-06-09
IE920532A1 (en) 1992-12-16
EP0516922A3 (en) 1993-09-01
TR26437A (tr) 1995-03-15
CN1067526A (zh) 1992-12-30
EP0516922A2 (de) 1992-12-09
BR9202058A (pt) 1993-02-02
TW225605B (zh) 1994-06-21
ZA921453B (en) 1992-12-30
NO920672L (no) 1992-12-07

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