EP1459331A2 - Etrier a ressort, limiteur de surtension equipe dudit etrier et ensemble limiteur de surtension - Google Patents

Etrier a ressort, limiteur de surtension equipe dudit etrier et ensemble limiteur de surtension

Info

Publication number
EP1459331A2
EP1459331A2 EP02795007A EP02795007A EP1459331A2 EP 1459331 A2 EP1459331 A2 EP 1459331A2 EP 02795007 A EP02795007 A EP 02795007A EP 02795007 A EP02795007 A EP 02795007A EP 1459331 A2 EP1459331 A2 EP 1459331A2
Authority
EP
European Patent Office
Prior art keywords
spring
spring clip
surge arrester
arm
fusible element
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Withdrawn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
EP02795007A
Other languages
German (de)
English (en)
Inventor
Peter Bobert
Frank Bothe
Jürgen Boy
Norbert Krost
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.)
TDK Electronics AG
Original Assignee
Epcos 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 Epcos AG filed Critical Epcos AG
Publication of EP1459331A2 publication Critical patent/EP1459331A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/01—Mounting; Supporting
    • H01C1/014—Mounting; Supporting the resistor being suspended between and being supported by two supporting sections
    • 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
    • H01C7/10—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 voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors

Definitions

  • the invention describes a spring clip for clamping onto a surge arrester. Furthermore, the invention relates to an arrangement of the surge arrester with the spring clip. The invention also relates to a method for producing the arrangement.
  • surge arresters of the type mentioned at the outset are known, in which a shorting bar is provided which is fastened to the central electrode of the surge arrester. A fusible element and a varistor are clamped between a spring arm of the shorting bar and a respective outer electrode of the surge arrester. After the overvoltage arrester, the spring, the fusible element and the varistor have been assembled, the overvoltage arrester is fed to the corresponding application and, for this purpose, soldered into a circuit board, for example.
  • the fusible element serves as a fuse to protect the surge arrester from overheating in the event of a fault.
  • the known surge arrester has the disadvantage that overheating of the surge arrester and thus the occurrence of fire can be effectively prevented by the fuse, but there is a risk that the thermal energy required for melting the fuse will be sufficient to dissolve the solder on the conductor the circuit board keeps melting and thus unsoldering the conductor.
  • a spring clip which has a clamping device.
  • the spring clip can be clamped onto a surge arrester by means of the clamping device.
  • the spring clip has at least one spring arm.
  • the spring clip has a thermal protection device which is attached to the inside of the spring arm.
  • the protective device also contains a fusible element.
  • the spring clip including the protective device can only be fitted after the surge arrester has been soldered onto the printed circuit board.
  • the assembly can be carried out from one side of the surge arrester, for example on the side of the surge arrester facing away from the printed circuit board. Since, therefore, the surge arrester is already soldered at the time of assembly and, consequently, the melting of the solder for the surge arrester no longer occurs, temperatures can be used for the fusible element in particular low-melting materials. The risk of unsoldering the surge arrester, which is provided with the spring clip, is thereby reduced.
  • a fusible element whose melting temperature is less than 210 ° C.
  • Such a fusible element has the advantage that its melting temperature is lower than the temperature between 210 and 280 ° C. usually used in wave soldering and reflow soldering. This ensures a high level of safety for triggering the thermal protection device even at relatively low temperatures.
  • the thermal protection device can also contain an insulating element which is an insulator when the surge arrester is operating. Together with the spring arm and the fusible element, it forms an electrical series connection.
  • the insulating element ensures that in normal operation no electrical current can flow between two electrodes of the surge arrester via the spring clip, as a result of which the spring clip or spring arm is electrically ineffective in normal operation.
  • the spring arm can also be provided with a contact element which extends inwards from the spring arm and whose length is greater than the thickness of the insulating element.
  • a gripping element for gripping the spring arm can be arranged on a spring arm.
  • two spring arms lying opposite one another are arranged on a spring base and that two spring legs lying opposite one another are arranged on the spring base between the spring arms for clamping the spring clip onto a surge arrester.
  • the spring clip can be clamped on the center electrode of a three-electrode arrester in a simple manner, whereby the required electrical contact between the spring arms and the center electrode of the surge arrester can be achieved at the same time.
  • the protective device can be fastened to the spring arm by means of a fastening element.
  • the protective device itself can be provided as a separate preassembled module that can be attached to the spring clip simply and without great effort using a special fastening element.
  • the protective device can be connected to the spring arm by soldering, gluing or also by riveting.
  • An electrically conductive adhesive is particularly suitable for the adhesive.
  • soldering it is contemplated to use a soft solder whose melting temperature is lower than the melting temperature of the fusible element. This has the advantage that when the protective device is soldered to the spring clip, the fusible element no longer melts and thus maintains its external shape.
  • the melting temperature of such a soft solder can be, for example, 130 ° C.
  • the melting temperature of the fusible element is preferably approximately 200 ° C.
  • the insulating element can be connected to the fusible element by soldering.
  • a solder is preferably used, the melting temperature of which is lower than the melting temperature of the fusible element.
  • the insulating element can, for example, be a molded plastic part.
  • a varistor as the insulating element, in particular in order to achieve a fine protection function on the surge arrester. It is only necessary to ensure that the varistor acts as a variable resistor at the operating voltage of the surge arrester.
  • two spring arms lying opposite one another can be provided on a common spring base and a protective device can be fastened on the inside of each spring arm.
  • Such a spring clip has the advantage that it is particularly suitable for use with three-electrode surge arresters.
  • An arrangement of a surge arrester is also specified, a spring clip in accordance with the above description being provided in addition to a surge arrester with at least one outer electrode.
  • the surge arrester is soldered onto a circuit board.
  • the spring clip is clamped onto the surge arrester.
  • a spring arm presses a thermal protection device against an outer electrode of the surge arrester.
  • Such an arrangement of a surge arrester has the advantage that a very low-melting, fusible element can be used for the protective device, since a subsequent mounting of the protective device on the surge arrester is possible due to the spring clip.
  • the surge arrester having two outer electrodes.
  • the surge arrester has a spring clip, as described above and how it is suitable for a three-electrode surge arrester.
  • the surge arrester is soldered onto a circuit board.
  • the spring clip has two spring arms located opposite one another. Each spring arm presses a protective device against an outer electrode of the surge arrester.
  • an arrangement of a surge arrester is specified in which the surge arrester is soldered onto the circuit board by means of a solder, the melting temperature of which is greater than the melting temperature of the fusible element.
  • a method for producing an arrangement of a surge arrester is specified, the surge arrester being soldered to a printed circuit board in a first step.
  • the spring clip is clamped onto the surge arrester.
  • Figure 1 shows an example of an arrangement of a surge arrester in a schematic cross section.
  • Figure 2 shows an example of a spring clip with a surge arrester in a schematic cross section.
  • FIG. 3 shows the spring clip from FIG. 2 with a clamping device and with two spring arms.
  • Figure 4 shows the spring clip of Figure 3 in section A-A.
  • Figures 5, 6, 7, 8 show examples of further spring clips with surge arrester each in a schematic cross section.
  • Figure 1 shows a two-electrode surge arrester 2, which is attached to a circuit board 18.
  • the attachment is carried out by means of the outer electrodes 15, 16 which are soldered onto the printed circuit board 18.
  • One of the outer electrodes 16 has a flat edge in order to secure the surge arrester 2 during rolling before it rolls away.
  • a spring clip 17 is also provided, which has a first spring arm 3 and has a further spring arm 10.
  • the two spring arms 3, 10 form the clamping device 1, by means of which the spring clip 17 is mounted on the surge arrester 2.
  • a thermal protection device 4 is fastened to the spring arm 3 by means of a fastening element 13.
  • the thermal protection device 4 has a fusible element 5 and an insulating element 6. Meltable element 5 and insulating element 6 are connected to one another by soldering.
  • the thermal protection device 4 is also connected to the fastening element 13 by soldering.
  • the fastening element 13 is plugged onto the spring arm (see also FIG. 2).
  • a contact element 7 is provided, the length L of which is greater than the thickness d of the insulating element 6.
  • a gripping element 8 is provided which can be gripped by means of a tool and which serves to spread the spring arms 3, 10 apart when mounted on the surge arrester 2.
  • FIG. 2 shows a surge arrester 2 with external electrodes 15, 16.
  • a central electrode 19 is provided.
  • a spring clip 17 has a spring base 9.
  • a first spring leg 11 is arranged, which is formed in two parts and which is clamped onto the surge arrester 2 in the middle section thereof.
  • Spring arms 3, 10 are also provided, each pressing a thermal protection device 4, 14 against an outer electrode 15, 16, respectively.
  • the insulating element 6 can be a varistor or a plastic molded part.
  • the fastening element 13 consists of a conductive, metallic material, preferably of brass.
  • the fastening element 13 has a circumferential recess 20 for fastening in an assembly slot 22 (see FIG. 4) of the spring arm 3, 10 serves.
  • the fastening element 13 can be made from tubular material or also from solid material.
  • both the insulating element 6, which can be a varistor, and the fastening element 13 have a galvanic coating.
  • the insulating element 6, designed as a varistor, is preferably additionally silver-plated.
  • the fastening element 13 is preferably tinned or coated with a tin alloy. Insulating element 6 and / or fusible element can be provided with a bore 31 to accommodate any excess soft solder that may occur.
  • the elements fastening element 13, insulating element 6 and fusible element 5 are soldered together.
  • the fusible element 5 is in this as
  • Soft solder disc executed.
  • the soldering is carried out by means of a soft solder, the melting temperature of which is preferably 130 ° C. and is in any case lower than the melting temperature of the fusible element 5.
  • the melting temperature of the fusible element 5 is preferably 190-198 ° C. and should in any case be chosen such that at Overloading of the short circuit mediated by the spring clip triggers clearly from a printed circuit board before the surge arrester 2 is unsoldered.
  • the fastening element 13, the insulating element 6 and the fusible element 5 are in an electrical series connection.
  • the insulating element 6 is arranged between the fastening element 13 and the fusible element 5.
  • a different sequence of fusible element 5 and insulating element 6 can also be selected.
  • the fusible element 5 contacts the outer electrode 15, 16.
  • the outer electrode 15 can either be provided without, as shown in FIG. 2, or, as shown in FIG. 5, with an additional contact stud 25.
  • the pre-soldered assembly with fastening element 13, insulating element 6 and fusible element 5 is then mounted with the fastening element 13 in an assembly slot 22 (cf. FIG. 4) of the spring arm 3.
  • the spring clip 17 consists of a spring material, preferably copper beryllium. In order to achieve low contact and contact resistances and to improve the solderability, it is advantageous if the spring clip 17 has a galvanic coating, preferably made of tin or a tin alloy. 4 is the mounting slot 22 with one or two
  • the spreading of the spring arm 3 can additionally be supported by a slot 23.
  • the fastening element 13 has a circumferential recess 20, by means of which it can be fastened in the assembly slot 22.
  • the spring clip 17 After fastening the fastening element 13 and after soldering the overvoltage arrester 2 onto a printed circuit board, the spring clip 17 can be gripped and spread out on en gripping elements 8 with the aid of a simple assembly tool.
  • the gripping elements 8 have the advantage that both the insulating element 6 and the fusible element 5 are mechanically protected during the assembly of the spring clip 17 on the already soldered surge arrester 2.
  • the center electrode 19 of the surge arrester 2 can serve as a guide and electrical contact element. For this purpose, the center electrode 19 is guided into the slot arranged between the two parts of the spring legs 11, 12.
  • the outer diameter of the outer electrodes 15, 16 is the same or somewhat Larger than the diameter of the directly adjacent part of the surge arrester 2. This ensures good solderability by wave soldering or reflow soldering on the circuit board.
  • the outer electrodes 15, 16 can be round or square.
  • the outer electrodes 15, 16 can be shaped square to prevent the surge arrester 2 from rolling away from the printed circuit board.
  • Protective devices 4, 14 are selected so that a sufficient air gap 21 remains between contact element 7 and outer electrode 15, 16. It can also be seen in FIG. 2 that the spring legs 11, 12 do not protrude beyond the outer dimensions of the surge arrester 2. This is the only way to securely clamp the spring clip 17 even after the surge arrester 2 has been soldered onto a printed circuit board.
  • FIG. 3 shows the spring clip 17 from FIG. 2 with the gripping elements 8 and the contact elements 7.
  • FIG. 4 shows the spring clip 17 from FIG. 2.
  • the width B of the spring base 9 is somewhat larger than the diameter D of the thermal protection device 4.
  • the thermal protection device 4 is mechanically protected during assembly processes (see also FIG. 2).
  • FIG. 5 shows a spring clip 17 with a surge arrester 2 according to FIG. 2, but the outer electrodes 15, 16 are provided with a contact plug 25.
  • the contact socket 25 can advantageously protrude the outer plane of the outer electrodes 15, 16 by a few tenths of a millimeter.
  • FIG. 6 shows a spring clip 17 with a surge arrester 2 corresponding to FIG. 2.
  • the fastening element 13 is a molded plastic part which has a recess 26. With the aid of this recess 26, the fastening element 13 can be pushed onto the spring arm 3, 10.
  • the fastening element 13 also has a spring element 29, into which the thermal protection device 4, 14 is inserted.
  • the fastening element 13 also has a hole 27 through which a contact piece 28 of the spring arm 3, 10 engages and which serves to secure the fastening of the fastening element 13 on the spring arm 3, 10.
  • the insulating element 6 is inserted into the fastening element 13.
  • FIG. 7 shows a spring clip 17 with a surge arrester 2 corresponding to FIG. 2.
  • no fastening element 13 is provided.
  • the spring arm 3, 10 the fusible element 5 and the insulating element 6 are soldered directly to one another.
  • the soldering is carried out with low-melting solder with a melting temperature of preferably about 130 ° C. It is possible to interchange the position of the fusible element 5 and the insulating element 6.
  • the fusible element 5 is designed as a molded part which has an elevation 30. This elevation 30 engages in a hole in the spring arm 3, 10 and can be riveted there.
  • the gripping elements 8 are also missing in FIG. 8. Rather, only the contact elements 7 are provided. The contact tiata 7 can also be used as gripping elements.
  • the soft soldering described can be replaced by adhesive bonding using a conductive adhesive, for example a silver adhesive.
  • a fine protection function of the surge arrester can be dispensed with and consequently the insulating element 6 is not designed as a varistor but as a simple insulator, for example a plastic disk.
  • This plastic disc can be glued to the fusible element 5 with adhesive.
  • the plastic disc can also be glued directly to the spring arm 3.
  • the plastic pane can be provided with solderable layers on the circular surfaces, which makes it possible to soft-solder the thermal protection device 4, 14.
  • the provision of a simple insulator as an insulating element 6 instead of a varistor has the advantage that the same spring clip 17 can be used for the two embodiments with and without a fine protection function of the surge arrester, and therefore no further components / modifications are necessary.
  • both the insulating element 6 and the fusible element 5 can be made of plastic.
  • the present invention is not limited to three-electrode arresters but can be used for any conductor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuses (AREA)
  • Clamps And Clips (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

L'invention concerne un étrier de fixation (17) comportant un dispositif de blocage (1) permettant de bloquer ledit étrier de fixation (17) sur un coupe-circuit de surtension (2) par un côté de ce dernier. Cet étrier de fixation présente au moins un bras faisant ressort (3) ainsi qu'un dispositif de protection thermique (4) fixé sur le côté intérieur du bras (3) et contenant un élément fusible (5). Le dispositif de protection thermique (4) étant fixé sur l'étrier de fixation (17), il est possible de sélectionner un point de fusion bas pour l'élément fusible (5). L'invention concerne en outre un ensemble coupe-circuit de surtension (2) équipé dudit étrier de fixation (17). Elle concerne également un procédé pour produire ledit ensemble.
EP02795007A 2001-12-20 2002-12-16 Etrier a ressort, limiteur de surtension equipe dudit etrier et ensemble limiteur de surtension Withdrawn EP1459331A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10162916A DE10162916A1 (de) 2001-12-20 2001-12-20 Federbügel, Überspannungsableiter mit dem Federbügel und Anordnung eines Überspannungsableiters
DE10162916 2001-12-20
PCT/DE2002/004596 WO2003054892A2 (fr) 2001-12-20 2002-12-16 Etrier de fixation et ensemble coupe-circuit de tension equipe dudit etrier de ressort

Publications (1)

Publication Number Publication Date
EP1459331A2 true EP1459331A2 (fr) 2004-09-22

Family

ID=7710155

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02795007A Withdrawn EP1459331A2 (fr) 2001-12-20 2002-12-16 Etrier a ressort, limiteur de surtension equipe dudit etrier et ensemble limiteur de surtension

Country Status (7)

Country Link
US (1) US20050030690A1 (fr)
EP (1) EP1459331A2 (fr)
JP (1) JP2005513727A (fr)
CN (1) CN1608297A (fr)
AU (1) AU2002360903A1 (fr)
DE (1) DE10162916A1 (fr)
WO (1) WO2003054892A2 (fr)

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DE102004025912A1 (de) * 2004-05-27 2005-12-22 Epcos Ag Überspannungsableiter
DE102005016848A1 (de) * 2005-04-12 2006-10-19 Epcos Ag Überspannungsableiter
DE102007004342A1 (de) * 2006-12-05 2008-06-19 Dehn + Söhne Gmbh + Co. Kg Steckbarer Überspannungsableiter
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
DE102008062491A1 (de) 2008-12-16 2010-06-17 Epcos Ag Überspannungsableiter mit einer Kurzschlusseinrichtung
CN101989741B (zh) * 2009-07-31 2013-08-21 上海联电实业有限公司 一种信号浪涌保护器
DE102010036909B3 (de) * 2010-08-06 2012-02-16 Phoenix Contact Gmbh & Co. Kg Thermische Überlastschutzvorrichtung
CN104168735A (zh) * 2013-05-17 2014-11-26 鸿富锦精密工业（深圳）有限公司 弹片组件
CN105374653A (zh) * 2015-12-04 2016-03-02 深圳市槟城电子有限公司 一种气体放电管
CN107103971B (zh) * 2017-01-18 2019-02-01 江苏双兴工贸有限公司 一种新式电阻安装器
CN106847446B (zh) * 2017-01-18 2018-10-19 江苏世星电子科技有限公司 一种电阻安装器
CN107103970B (zh) * 2017-01-18 2019-02-01 江苏双兴工贸有限公司 一种稳固式电阻安装器

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Also Published As

Publication number Publication date
WO2003054892A2 (fr) 2003-07-03
CN1608297A (zh) 2005-04-20
JP2005513727A (ja) 2005-05-12
DE10162916A1 (de) 2003-07-10
WO2003054892A3 (fr) 2004-01-29
AU2002360903A8 (en) 2003-07-09
AU2002360903A1 (en) 2003-07-09
US20050030690A1 (en) 2005-02-10

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