EP1376624B1 - Electrical component with an isolation zone - Google Patents
Electrical component with an isolation zone Download PDFInfo
- 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
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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.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Description
Die Erfindung betrifft ein elektrisches Bauelement mit einem Grundkörper, der ein Keramikmaterial enthält und bei dem auf der ebenen Oberfläche des Grundkörpers eine Kontaktschicht zur elektrischen Kontaktierung aufgebracht ist.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.
Es sind Bauelement der eingangs genannten Art bekannt, bei denen auf gegenüberliegenden Oberflächen des Grundkörpers Kontaktschichten zur elektrischen Kontaktierung aufgebracht sind. Solche elektrischen Bauelemente sind beispielsweise als Varistoren bekannt. Die Seitenflächen der Varistorscheibe werden üblicherweise nicht vollständig bis zum Rand der Scheibe metallisiert, vielmehr verbleibt am Rand der Metallisierung ein Freirand mit nicht metallisierter Varistoroberfläche. Dieser Freirand wird eingehalten, um die elektrische Isolation der gegenüberliegenden Kontaktschichten zu verbessern.There are known component of the type mentioned, in which 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.
Die bekannten Bauelemente haben jedoch den Nachteil, daß es am Metallisierungsrand zu einer elektrischen Spitzenwirkung, d. h. zu einer Feldüberhöhung kommt, wodurch die Spannungsfestigkeit und mithin auch die Stromtragfähigkeit des Varistors deutlich herabgesetzt ist. Im schlimmsten Fall kommt es zum Verzundern und Abbrand des Metallisierungsrandes und somit zum Ausfall des Bauelements.However, 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.
Dieser Nachteil kann vermieden werden, indem als Kontaktschicht Metallisierungen mit einer großen und gleichmäßigen Schichtdicke aufgebracht werden. Dadurch wird zwar die Stromtragfähigkeit erhöht, jedoch kann das Problem der überhöhten Randfeldstärken dadurch nicht befriedigend gelöst werden. Zudem haben Metallschichten mit großer Schichtdicke noch den Nachteil, daß zu ihrer Aufbringung auf die Oberfläche des Varistors lange Zeiten erforderlich sind, insbesondere dann, wenn sie in einer Dünnschichttechnologie wie z. B. Sputtern aufgebracht werden. Im Falle von Edelmetallgrundschichten (Silber, Gold, Platin, Palladium etc.) stellt sich bei hoher Schichtdicke darüber hinaus noch die Kostenfrage.This disadvantage can be avoided by applying metallizations with a large and uniform layer thickness as the contact layer. Although this increases the ampacity, the problem of excessive edge field strengths can not be satisfactorily solved. In addition, metal layers with large layer thickness still have the disadvantage that their application to the surface of the varistor long times are required, in particular, when used in a thin-film technology such. B. sputtering applied. In the case of noble metal base layers (silver, gold, platinum, palladium, etc.), the cost issue also arises with a high layer thickness.
Aus
Es ist daher Aufgabe der vorliegenden Erfindung, ein elektrisches Bauelement bereitzustellen, bei dem die Gefahr von elektrischen Überschlägen zwischen Kontaktschichten reduziert werden kann.It is therefore an object of the present invention to provide an electrical component in which the risk of electrical flashovers between contact layers can be reduced.
Diese Aufgabe wird gelöst durch ein elektrisches Bauelement nach Patentanspruch 1. Vorteilhafte Ausgestaltungen der Erfindung sind den weiteren Patentansprüchen zu entnehmen.This object is achieved by an electrical component according to claim 1. Advantageous embodiments of the invention can be found in the further claims.
Es wird ein elektrisches Bauelement angegeben, das einen Grundkörper aufweist, der ein Keramikmaterial enthält. Auf einer ebenen Oberfläche des Grundkörpers ist eine Kontaktschicht aufgebracht, die zur elektrischen Kontaktierung des Grundkörpers dient. Auf der Kontaktschicht ist eine Elektrode befestigt, die mit Distanzelementen in Form von Abstandsnoppen versehen ist. Die Distanzelemente dienen dabei zur Einstellung eines definierten Abstands zwischen der Kontaktschicht und der Elektrode.It is an electrical device specified, which has a base body containing a ceramic material. On a flat surface of the base body, a contact layer is applied, which serves for electrical contacting of the base body. On the contact layer, an electrode is attached, which is provided with spacer elements in the form of spacer studs. The spacer elements serve to set a defined distance between the contact layer and the electrode.
Das elektrische Randfeld ist in einem erfindungsgemäßen Bauelement nicht nur durch den Abstand zwischen den einander gegenüberliegenden Randbereichen der Kontaktschichten, sondern auch durch den Abstand zwischen den einander gegenüberliegenden Randbereichen der Elektroden definiert.In a component according to the invention, 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.
Das elektrische Bauelement hat den Vorteil, daß durch die in einem definierten Abstand zur jeweiligen Kontaktschicht auf gebrachte Elektrode die elektrische Feldstärke am Rand dieser Kontaktschicht so beeinflußt werden kann, daß eine Feldüberhöhung zwischen den einander gegenüberliegenden Randbereichen der Kontaktschichten reduziert wird. Dadurch steigt die Spannungsfestigkeit des Bauelements in vorteilhafter Weise an.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.
Die Elektrode kann dabei vorteilhafterweise in Richtung parallel zur ebenen Oberfläche des Grundkörpers über den Rand der Kontaktschicht hinausragen, um somit eine besonders effektive Abschirmwirkung für die am Rand der Kontaktschicht entstehenden elektrischen Felder zu bewirken.In this case, 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.
Es kann aber auch die Kontaktschicht in Richtung parallel zur ebenen Oberfläche des Grundkörpers unter der Elektrode hervorstehen. Dabei sollte der Abstand zwischen dem Rand der Elektrode und dem Rand der Kontaktschicht so klein gewählt werden, daß die Elektrode noch Einfluß auf die Feldverteilung am Rand der Kontaktschicht nehmen kann.But it 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.
Darüber hinaus ist es auch denkbar, daß der Rand der Elektrode in Richtung parallel zur ebenen Oberfläche des Grundkörpers genau über dem Rand der Kontaktschicht zum Liegen kommt.Moreover, it is also conceivable that the 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.
Darüber hinaus ist es vorteilhaft, wenn die Elektrode bis zum Rand der ebenen Oberfläche des Grundkörpers reicht. Dadurch wird eine besonders gute Abschirmwirkung der Elektrode erzielt.Moreover, it is advantageous if 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.
Vorteilhaft ist es, wenn die Kontaktschicht einen Freirand am Rand der Oberfläche des Grundkörpers freiläßt. Zur Einhaltung des Freirandes am Rand des elektrischen Bauelements wird der Rand der Kontaktschicht ein Stück nach innen versetzt.It is advantageous if the contact layer leaves a free edge at the edge of the surface of the base body. To comply with the free edge at the edge of the electrical component, the edge of the contact layer is offset a bit inwards.
Um den Effekt der elektrischen Feldüberhöhung am Rand der Elektrode möglichst gering zu halten, ist es vorteilhaft, wenn die Dicke der Elektrode wenigstens zweimal so groß ist wie die Dicke der Kontaktschicht. Dadurch ist gewährleistet, daß der Effekt der Feldüberhöhung am Rand bei der Elektrode kleiner ist als bei der Kontaktschicht.In order to keep the effect of the electric field increase at the edge of the electrode as low as possible, it is advantageous if 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.
Darüber hinaus ist ein elektrisches Bauelement vorteilhaft, bei dem der Grundkörper die Form einer Scheibe aufweist, auf deren Ober- und Unterseite jeweils eine Kontaktschicht angeordnet ist. Jede dieser Kontaktschichten kann mit der erfindungsgemäßen Elektrode versehen sein. Dadurch wird eine noch weitere Reduktion der Feldüberhöhung an den Rändern der Kontaktschichten erreicht.In addition, 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. As a result, an even further reduction of the field superelevation is achieved at the edges of the contact layers.
Im Folgenden wird die Erfindung anhand eines Ausführungsbeispiels und der dazugehörigen Figur näher erläutert.In the following the invention will be explained in more detail with reference to an embodiment and the associated figure.
Die Figur zeigt beispielhaft ein elektrisches Bauelement in einem schematischen Querschnitt.
Die Figur zeigt einen scheibenförmigen Varistor im schematischen Querschnitt. Der Varistor weist einen Grundkörper 1 auf, welcher aus einer Varistorkeramik hergestellt ist.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.
Der Grundkörper 1 weist die Form einer Scheibe auf, wobei die Oberseite der Scheibe und die Unterseite der Scheibe jeweils mit einer Kontaktschicht 2, 2a bedeckt ist. Die Kontaktschichten 2, 2a reichen dabei nicht bis zum Rand der Oberseite bzw. der Unterseite des Grundkörpers 1, sondern es bleibt am Rand der Kontaktschichten 2, 2a ein Freirand 5, der die elektrische Isolation zwischen den Kontaktschichten 2, 2a verbessert. Diese Verbesserung kommt dadurch zustande, daß mit dem Freirand 5 eine erhöhte Kriechstrecke von der Kontaktschicht 2 auf der Unterseite des Grundkörpers 1 zur Kontaktschicht 2a auf der Oberseite des Grundkörpers 1 vorgegeben ist.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
Durch die Kriechstrecke zwischen den Rändern der Kontaktschichten 2, 2a, die entlang der Außenseite des Grundkörpers 1 verläuft, wird die Isolationszone 6 definiert, die maßgeblichen Einfluß auf die Spannungsfestigkeit des Bauelements hat.Due to the creepage distance between the edges of the
Der Grundkörper 1 kann beispielsweise einen Durchmesser von 20 mm aufweisen und als Keramikmaterial eine Mischung aus ZnO und Bi2O3 enthalten. Es sind darüber hinaus aber auch weitere Keramikmaterialien denkbar, die einen Varistoreffekt aufweisen.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.
Die Kontaktschichten 2, 2a können beispielsweise Einbrennschichten sein, die Silber enthalten und aus einer Silbereinbrennpaste mittels Siebdruck hergestellt sind. Der Durchmesser der Kontaktschichten 2, 2a kann beispielsweise 16 mm betragen. Daraus ergibt sich für den Freirand 5 eine Breite von 2 mm. Die Kontaktschichten 2, 2a können eine Dicke d von 15 µm aufweisen.The
Jede der Kontaktschichten 2, 2a trägt auf der dem Grundkörper 1 gegenüberliegenden Seite eine Elektrode 4, 4a, die beispielsweise eine verzinnte Kupferscheibe mit einem Durchmesser von 19 mm sein kann. Die Dicke D der Elektrode 4, 4a kann z. B. 0,5 mm betragen. Die Elektroden 4, 4a sind mit Distanzelementen 7 versehen, welche beispielsweise eine Stärke von 0,25 mm aufweisen und welche folglich einen Abstand a zwischen der Elektrode 4, 4a und der Kontaktschicht 2, 2a bewirken, der 0,25 mm beträgt. Der Abstand a zwischen der Kontaktschicht 2 und der Elektrode 4 kann vorteilhafterweise zwischen 0,1 und 0,5 mm betragen. Die Distanzelemente 7 können beispielsweise in Form von Abstandsnoppen in die verzinnte Kupferscheibe eingeprägt sein.Each of the
Die Elektroden 4, 4a sind mittels eines Haftmittels 3 an den Kontaktschichten 2, 2a befestigt. Dieses Haftmittel 3 kann beispielsweise Zinn sein. Das Haftmittel 3 kann aber auch Leitkleber sein. Im Falle von Zinn erfolgt die Verbindung der Elektroden 4, 4a zu den Kontaktschichten 2, 2a durch Löten. Es ist darüber hinaus noch zu beachten, daß die Elektroden 4, 4a nicht notwendigerweise wie in der Figur dargestellt die Kontaktschichten 2, 2a ganzflächig bedecken. Entscheidend ist vielmehr lediglich ein Randbereich der Elektrode 4, 4a, weswegen die Elektroden auch in Form von Ringen ausgeführt sein können.The
In der Figur ist darüber hinaus noch der Verlauf von Feldlinien dargestellt, wie sie entstehen, wenn auf der oberen Kontaktschicht 2 ein positives elektrisches Potential und auf der unteren Kontaktschicht 2a ein negatives elektrisches Potential angelegt werden.The figure also shows the course of field lines as they arise when a positive electrical potential is applied to the
Die vorliegende Erfindung beschränkt sich nicht auf Varistoren, sondern ist auf alle möglichen elektrischen Bauelemente, die einen Grundkörper mit Keramikmaterial enthalten, beispielsweise NTC- oder PTC-Bauelemente, anwendbar.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.
Bezugszeichenliste
- 1
- Grundkörper
- 2, 2a
- Kontaktschicht
- 3
- Haftmittel
- 4, 4a
- Elektrode
- 5
- Freirand
- 6
- Isolationszone
- 7
- Distanzelement
- d
- Dicke der Kontaktschicht
- D
- Dicke der Elektrode
- a
- Abstand
- 1
- body
- 2, 2a
- contact layer
- 3
- adhesives
- 4, 4a
- electrode
- 5
- free edge
- 6
- isolation zone
- 7
- spacer
- d
- Thickness of the contact layer
- D
- Thickness of the electrode
- a
- distance
Claims (7)
- Electrical component- having a main body (1) containing a ceramic material,- having a contact layer (2) for making electrical contact applied to a flat surface of the main body (1), characterized by- an electrode (4) attached to the contact layer (2), said electrode being provided with spacing elements (7) in the form of spacer nubs, which are used to set a defined gap (a) between the contact layer (2) and the electrode (4).
- Component according to Claim 1,
in which the electrode (4) projects beyond the edge of the contact layer (2) in a direction parallel to the flat surface of the main body. - Component according to Claim 1,
in which the contact layer (2) protrudes under the electrode (4) in a direction parallel to the flat surface of the main body. - Component according to Claim 1,
in which the edge of the electrode (4) lies substantially above the edge of the contact layer (2) in a direction parallel to the flat surface of the main body. - Component according to any of Claims 1 to 4,
in which the electrode (4) extends up to the edge of the flat surface of the main body (1) in a direction parallel to the flat surface of the main body. - Component according to any of Claims 1 to 5,
in which the thickness (D) of the electrode (4) is at least twice as large as the thickness (d) of the contact layer (2). - Component according to any of Claims 1 to 6,
in which the main body (1) takes the shape of a disc, on whose upper face and lower face respectively a contact layer (2, 2a) is arranged.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002127563 DE10227563B4 (en) | 2002-06-20 | 2002-06-20 | Electrical component with isolation zone |
| DE10227563 | 2002-06-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1376624A1 EP1376624A1 (en) | 2004-01-02 |
| EP1376624B1 true EP1376624B1 (en) | 2007-10-17 |
Family
ID=29716568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20030013864 Expired - Lifetime EP1376624B1 (en) | 2002-06-20 | 2003-06-18 | Electrical component with an isolation zone |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1376624B1 (en) |
| DE (2) | DE10227563B4 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019110374A1 (en) * | 2019-04-18 | 2020-10-22 | Tdk Electronics Ag | Component |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1170046B (en) * | 1960-10-11 | 1964-05-14 | Licentia Gmbh | Resistor stack consisting of voltage-dependent mass resistance disks for operation in the insulating and coolant of transformers |
| 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 (en) * | 1987-11-27 | 1989-06-05 | Murata Mfg Co Ltd | Organic positive characteristic thermister |
| JP3550243B2 (en) * | 1996-01-30 | 2004-08-04 | 株式会社東芝 | Internal pressure welding type semiconductor device |
| DE19729184A1 (en) * | 1997-07-08 | 1999-02-04 | Siemens Matsushita Components | Electrical varistor component |
| DE19856939A1 (en) * | 1998-12-10 | 2000-06-15 | Bettermann Obo Gmbh & Co Kg | Circuit arrangement for protecting electrical installations against overvoltage events |
| DE29912703U1 (en) * | 1999-07-19 | 1999-11-11 | Siemens Ag | Surge arresters |
-
2002
- 2002-06-20 DE DE2002127563 patent/DE10227563B4/en not_active Expired - Fee Related
-
2003
- 2003-06-18 DE DE50308391T patent/DE50308391D1/en not_active Expired - Lifetime
- 2003-06-18 EP EP20030013864 patent/EP1376624B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE10227563B4 (en) | 2004-08-12 |
| EP1376624A1 (en) | 2004-01-02 |
| DE50308391D1 (en) | 2007-11-29 |
| DE10227563A1 (en) | 2004-01-15 |
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