EP1376624B1 - Composant électrique avec une zone isolante - Google Patents

Composant électrique avec une zone isolante Download PDF

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Publication number
EP1376624B1
EP1376624B1 EP20030013864 EP03013864A EP1376624B1 EP 1376624 B1 EP1376624 B1 EP 1376624B1 EP 20030013864 EP20030013864 EP 20030013864 EP 03013864 A EP03013864 A EP 03013864A EP 1376624 B1 EP1376624 B1 EP 1376624B1
Authority
EP
European Patent Office
Prior art keywords
electrode
contact layer
edge
main body
flat surface
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
EP20030013864
Other languages
German (de)
English (en)
Other versions
EP1376624A1 (fr
Inventor
Hermann GRÜNBICHLER
Martin Schwingenschuh
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 EP1376624A1 publication Critical patent/EP1376624A1/fr
Application granted granted Critical
Publication of EP1376624B1 publication Critical patent/EP1376624B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01C7/102—Varistor boundary, e.g. surface layers
    • 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 relates to an electrical component having a base body which contains a ceramic material and in which a contact layer for electrical contacting is applied to the flat surface of the base body.
  • contact layers are applied for electrical contacting on opposite surfaces of the base body.
  • Such electrical components are known for example as varistors.
  • the side surfaces of the varistor disc are usually not completely metallized to the edge of the disc, but remains at the edge of the metallization a free edge with non-metallized varistor surface. This free edge is maintained to improve the electrical insulation of the opposing contact layers.
  • the known components have the disadvantage that at the metallization edge to an electrical peak effect, d. H. An increase in field occurs, as a result of which the dielectric strength and consequently also the current-carrying capacity of the varistor is markedly reduced. In the worst case, it comes to scaling and burning of the metallization edge and thus the failure of the device.
  • the electrical edge field is not only defined by the distance between the mutually opposite edge regions of the contact layers, but also by the distance between the mutually opposite edge regions of the electrodes.
  • the electrical component has the advantage that by the at a defined distance from the respective contact layer brought electrode, the electric field strength at the edge of this contact layer can be influenced so that an increase in field between the opposite edge regions of the contact layers is reduced. As a result, the dielectric strength of the device increases in an advantageous manner.
  • the electrode can advantageously project beyond the edge of the contact layer in the direction parallel to the planar surface of the base body, in order thus to produce a particularly effective shielding effect for the electric fields produced at the edge of the contact layer.
  • the contact layer may also protrude the contact layer in the direction parallel to the flat surface of the body below the electrode.
  • the distance between the edge of the electrode and the edge of the contact layer should be chosen so small that the electrode can still influence the field distribution at the edge of the contact layer.
  • edge of the electrode comes to rest in the direction parallel to the flat surface of the base body just above the edge of the contact layer.
  • the electrode extends to the edge of the flat surface of the base body. As a result, a particularly good shielding effect of the electrode is achieved.
  • the contact layer leaves a free edge at the edge of the surface of the base body.
  • the edge of the contact layer is offset a bit inwards.
  • the thickness of the electrode is at least twice as large as the thickness of the contact layer. This ensures that the effect of field elevation at the edge is smaller at the electrode than at the contact layer.
  • an electrical component is advantageous in which the base body has the shape of a disk on whose top and bottom are each arranged a contact layer.
  • Each of these contact layers may be provided with the electrode according to the invention.
  • the figure shows an example of an electrical component in a schematic cross section.
  • the figure shows a disc-shaped varistor in schematic cross-section.
  • the varistor has a main body 1, which is made of a varistor ceramic.
  • the base body 1 has the shape of a disk, wherein the upper side of the disk and the underside of the disk are each covered with a contact layer 2, 2a.
  • the contact layers 2, 2a do not extend to the edge of the upper side or the underside of the main body 1, but it remains at the edge of the contact layers 2, 2a a free edge 5, which improves the electrical insulation between the contact layers 2, 2a. This improvement is due to the fact that with the free edge 5 an increased creepage distance from the contact layer 2 on the underside of the base body 1 to the contact layer 2a on the upper side of the base body 1 is predetermined.
  • the insulation zone 6 Due to the creepage distance between the edges of the contact layers 2, 2a, which runs along the outside of the main body 1, the insulation zone 6 is defined, which has a significant influence on the dielectric strength of the device.
  • the main body 1 may, for example, have a diameter of 20 mm and contain as ceramic material a mixture of ZnO and Bi 2 O 3 . But there are also more Ceramic materials conceivable that have a varistor effect.
  • the contact layers 2, 2a may be, for example, baking layers containing silver and made from a silver stoving paste by screen printing.
  • the diameter of the contact layers 2, 2a may be for example 16 mm. This results in the free edge 5 a width of 2 mm.
  • the contact layers 2, 2a may have a thickness d of 15 ⁇ m.
  • Each of the contact layers 2, 2a carries on the opposite side of the main body 1, an electrode 4, 4a, which may be, for example, a tinned copper disc with a diameter of 19 mm.
  • the thickness D of the electrode 4, 4a may, for. B. be 0.5 mm.
  • the electrodes 4, 4a are provided with spacer elements 7, which for example have a thickness of 0.25 mm and which consequently cause a distance a between the electrode 4, 4a and the contact layer 2, 2a, which is 0.25 mm.
  • the distance a between the contact layer 2 and the electrode 4 may advantageously be between 0.1 and 0.5 mm.
  • the spacer elements 7 may be embossed, for example in the form of spacer studs in the tinned copper plate.
  • the electrodes 4, 4a are attached to the contact layers 2, 2a by means of an adhesive 3.
  • This adhesive 3 may be, for example, tin.
  • the adhesive 3 may also be conductive adhesive.
  • the connection of the electrodes 4, 4a to the contact layers 2, 2a takes place by soldering.
  • the electrodes 4, 4a do not necessarily cover the contact layers 2, 2a over the entire surface, as shown in the figure. Rather, only an edge region of the electrode 4, 4a is decisive, which is why the electrodes can also be designed in the form of rings.
  • the figure also shows the course of field lines as they arise when a positive electrical potential is applied to the upper contact layer 2 and a negative electrical potential is applied to the lower contact layer 2a.
  • the present invention is not limited to varistors, but is applicable to all sorts of electrical components including a body with ceramic material, such as NTC or PTC devices.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermistors And Varistors (AREA)

Claims (7)

  1. Composant électrique
    - ayant un corps de base (1) contenant un matériau céramique,
    - ayant une couche (2) de contact pour la mise en contact électrique qui est déposée sur une surface plane du corps de base (1), caractérisé par
    - une électrode (4) qui est fixée sur la couche (2) de contact et qui est munie d'éléments (7) d'entretoisement sous la forme de bossages de mise à distance, qui servent à établir une distance (a) définie entre la couche (2) de contact et l'électrode (4).
  2. Composant suivant la revendication 1,
    dans lequel l'électrode (4) dépasse dans la direction parallèlement à la surface plane du corps de base du bord de la couche (2) de contact.
  3. Composant suivant la revendication 1,
    dans lequel la couche (2) de contact est, dans la direction parallèlement à la surface plane du corps de base, en saillie en dessous de l'électrode (4).
  4. Composant suivant la revendication 1,
    dans lequel le bord de l'électrode (4) se trouve dans la direction parallèlement à la surface plane du corps de base sensiblement sur le bord de la couche (2) de contact.
  5. Composant suivant l'une des revendications 1 à 4,
    dans lequel l'électrode (4) va dans la direction parallèlement à la surface plane du corps de contact jusqu'au bord de la surface plane du corps de base (1).
  6. Composant suivant l'une des revendications 1 à 5,
    dans lequel l'épaisseur (D) de l'électrode (4) est au moins deux fois plus grande que l'épaisseur (d) de la couche (2) de contact.
  7. Composant suivant l'une des revendications 1 à 6,
    dans lequel le corps de base (1) a la forme d'un disque à la surface supérieure et inférieure duquel est disposée respectivement une couche (2, 2a) de contact
EP20030013864 2002-06-20 2003-06-18 Composant électrique avec une zone isolante Expired - Lifetime EP1376624B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2002127563 DE10227563B4 (de) 2002-06-20 2002-06-20 Elektrisches Bauelement mit Isolationszone
DE10227563 2002-06-20

Publications (2)

Publication Number Publication Date
EP1376624A1 EP1376624A1 (fr) 2004-01-02
EP1376624B1 true EP1376624B1 (fr) 2007-10-17

Family

ID=29716568

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030013864 Expired - Lifetime EP1376624B1 (fr) 2002-06-20 2003-06-18 Composant électrique avec une zone isolante

Country Status (2)

Country Link
EP (1) EP1376624B1 (fr)
DE (2) DE10227563B4 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019110374A1 (de) * 2019-04-18 2020-10-22 Tdk Electronics Ag Bauelement

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1170046B (de) * 1960-10-11 1964-05-14 Licentia Gmbh Aus spannungsabhaengigen Massewiderstands-scheiben bestehender Widerstandsstapel fuer den Betrieb im Isolier- und Kuehlmittel von Transformatoren
US4431983A (en) * 1980-08-29 1984-02-14 Sprague Electric Company PTCR Package
US4317101A (en) * 1980-10-27 1982-02-23 General Electric Company Stable high voltage DC varistor
US4441094A (en) * 1981-03-02 1984-04-03 General Electric Company Solderable largely base metal electrodes for metal oxide varistors
JPH01143203A (ja) * 1987-11-27 1989-06-05 Murata Mfg Co Ltd 有機正特性サーミスタ
JP3550243B2 (ja) * 1996-01-30 2004-08-04 株式会社東芝 内部圧接型半導体装置
DE19729184A1 (de) * 1997-07-08 1999-02-04 Siemens Matsushita Components Elektrisches Bauelement, insbesondere Energievaristor
DE19856939A1 (de) * 1998-12-10 2000-06-15 Bettermann Obo Gmbh & Co Kg Schaltungsanordnung zum Schutz von elektrischen Installationen gegen Überspannungsereignisse
DE29912703U1 (de) * 1999-07-19 1999-11-11 Siemens Ag Überspannungsableiter

Also Published As

Publication number Publication date
DE10227563B4 (de) 2004-08-12
EP1376624A1 (fr) 2004-01-02
DE50308391D1 (de) 2007-11-29
DE10227563A1 (de) 2004-01-15

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