DE19842006A1 - Contact structure, for PTC type conductive polymers used in electrical switching and protection devices, comprises a polymer sheet sandwiched between highly flexible metal contact electrodes - Google Patents
Contact structure, for PTC type conductive polymers used in electrical switching and protection devices, comprises a polymer sheet sandwiched between highly flexible metal contact electrodesInfo
- Publication number
- DE19842006A1 DE19842006A1 DE1998142006 DE19842006A DE19842006A1 DE 19842006 A1 DE19842006 A1 DE 19842006A1 DE 1998142006 DE1998142006 DE 1998142006 DE 19842006 A DE19842006 A DE 19842006A DE 19842006 A1 DE19842006 A1 DE 19842006A1
- Authority
- DE
- Germany
- Prior art keywords
- contact
- grooves
- arrangement according
- contact arrangement
- polymer
- 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- Withdrawn
Links
- 229920000642 polymer Polymers 0.000 title claims abstract description 13
- 229920001940 conductive polymer Polymers 0.000 title claims abstract description 4
- 229910052751 metal Inorganic materials 0.000 title abstract description 4
- 239000002184 metal Substances 0.000 title abstract description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract 2
- 229910052802 copper Inorganic materials 0.000 claims abstract 2
- 239000010949 copper Substances 0.000 claims abstract 2
- 230000000694 effects Effects 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000003754 machining Methods 0.000 claims 1
- 230000003313 weakening effect Effects 0.000 claims 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 239000011651 chromium Substances 0.000 abstract 1
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- 230000005520 electrodynamics Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/14—Terminals or tapping points or electrodes specially adapted for resistors; Arrangements of terminals or tapping points or electrodes on resistors
- H01C1/1406—Terminals or electrodes formed on resistive elements having positive temperature coefficient
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Contacts (AREA)
Abstract
Description
Die Erfindung betrifft eine Kontaktanordnung nach dem Oberbegriff des Anspruches 1.The invention relates to a contact arrangement according to the preamble of claim 1.
Bekannt ist es, derartige Kontakte mit speziellen Kontaktwerkstoffen, z. B. oberflächenbehandelten Kupferlegierungen, zu verwenden. Diese zeichnen sich durch einen insgesamt hohen Elastizitätsmodul aus. Die Kontaktelektroden werden hierbei unter hohem Druck aufeinandergepreßt. Diese Vorgehensweise führt dazu, daß sich der Kontaktwiderstand abhängig von verschiedenen Einflußgrößen wie Zeit, Anpreßkraft, Temperatur, Elastizitätsmoduln der Werkstoffpaarung u.ä. verändert. Ferner kann es durch elektrodynamische Kräfte zum Abheben der Elektroden vom Polymeren kommen. Dadurch können Lichtbögen entstehen, welche zur Zerstörung des Polymeren führen.It is known to make such contacts with special contact materials, eg. B. surface-treated copper alloys. These stand out by an overall high modulus of elasticity. The contact electrodes are pressed together under high pressure. This procedure leads to that the contact resistance depends on various influencing factors such as Time, contact pressure, temperature, modulus of elasticity of the material pairing, etc. changed. Furthermore, it can be lifted by electrodynamic forces Electrodes come from the polymer. This can cause arcing which lead to the destruction of the polymer.
Bei bisherigen Lösungen treten zwei Problemschwerpunkte auf: Die tatsächliche Kontaktfläche zwischen dem metallischen Kontaktstück und dem polymeren Kontaktstück beträgt infolge von Oberflächenunebenheiten und Fremdschichten nur wenige Prozent der geometrischen Kontaktfläche. Da der Kontaktwiderstand relativ hoch ist, wird sich daraus resultierend eine hohe Stromdichte mit starker lokaler Wärmeentwicklung einstellen.There are two main problems with previous solutions: The actual one Contact area between the metallic contact piece and the polymer Contact piece is only due to surface unevenness and foreign layers a few percent of the geometric contact area. Because the contact resistance is relative is high, this will result in a high current density with strong local Stop heat generation.
Problematisch ist ferner der Umstand, daß sich die thermischen Ausdehnungskoeffizienten von Metall und Kunststoff um eine Größenordnung unterscheiden. Da zum Auftreten von nutzbaren PTC-Effekten Temperaturunterschiede bis mehrere hundert Kelvin zwischen der Arbeitstemperatur und der PTC-Temperatur erzeugt werden müssen, werden thermisch induzierte Relativbewegungen in Größenordnungen von mehreren Millimetern auftreten. Diese Unterschiede in der Längenausdehnung führen zur weiteren Reduzierung der geometrischen Kontaktfläche und daraus resultierend zu einer Erhöhung des Kontaktwiderstandes. Diese Erhöhung ist besonders in der Abkühlphase nach einem Schaltvorgang infolge des PTC-Effektes unerwünscht.Another problem is the fact that the thermal Expansion coefficients of metal and plastic by an order of magnitude differentiate. Because of the occurrence of usable PTC effects Temperature differences up to several hundred Kelvin between the working temperature and the PTC temperature to be generated are thermally induced Relative movements in the order of several millimeters occur. This Differences in linear expansion lead to a further reduction in geometric contact area and resulting in an increase in Contact resistance. This increase is especially in the cooling phase after a switching process due to the PTC effect undesirable.
Ferner können elektrodynamische Kräfte zum Abheben der Elektroden führen, was zum Auftreten von Lichtbögen und damit zur Zerstörung des Polymers führt.Furthermore, electrodynamic forces can lead to the electrodes being lifted, which arcing occurs and the polymer is destroyed.
Die Aufgabe der Erfindung wird durch die kennzeichnenden Merkmale des Anspruches 1 gelöst, während in den Unteransprüchen besonders vorteilhafte Weiterbildungen der Erfindung gekennzeichnet sind.The object of the invention is characterized by the characterizing features of Claim 1 solved, while in the subclaims particularly advantageous Developments of the invention are characterized.
Anhand der Zeichnung, in der ein Ausführungsbeispiel dargestellt ist, sollen die Erfindung, weitere Ausgestaltungen und Verbesserungen der Erfindung und weitere Vorteile näher beschrieben und erläutert werden.Based on the drawing, in which an embodiment is shown, the Invention, further refinements and improvements of the invention and others Advantages are described and explained in more detail.
Es zeigt:It shows:
Fig. 1 eine Darstellung des Querschnitts der Kontaktelektrode und Fig. 1 is a representation of the cross section of the contact electrode and
Fig. 2 den Stand der Technik. Fig. 2 shows the prior art.
Durch Veränderung der Querschnittsgeometrie der Kontaktelektrode 2b, wie in Fig. 1 gezeigt ist, wird die Biegesteifigkeit reduziert. Die Kontaktelektrode kann sich dann der Oberfläche des Polymers 1 besser anpassen.The bending stiffness is reduced by changing the cross-sectional geometry of the contact electrode 2 b, as shown in FIG. 1. The contact electrode can then adapt better to the surface of the polymer 1 .
Die Kontaktelektrode kann auch glatt und relativ dünn sein. Besonders günstig ist es wenn ihre Dicke kleiner 1,5 mm beträgt, so daß deren Biegesteifigkeit gering ist. Schon bei relativ geringem Kontaktdruck passen sich die Kontaktelektroden der Oberflächenstruktur des Polymers an.The contact electrode can also be smooth and relatively thin. It is particularly cheap if their thickness is less than 1.5 mm, so that their bending rigidity is low. Even with a relatively low contact pressure, the contact electrodes of the Surface structure of the polymer.
Die Fig. 2 zeigt eine Kontaktanordnung bekannter Art für elektrisch leitfähiger Polymere mit PTC-Effekt zur Verwendung in elektrischen Schalt- und Schutzgeräten, bestehend aus einem plattenförmigen Polymer 1 und zwei das Polymer sandwichartig kontaktierenden metallischen Kontaktelektroden 2a. Fig. 2 shows a contact arrangement for a known type of electrically conductive polymers with PTC effect for use in electrical switching and protective devices, consisting of a plate-shaped polymer 1 and the polymer sandwiched two contacting metal contact electrodes 2 a.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998142006 DE19842006A1 (en) | 1998-09-15 | 1998-09-15 | Contact structure, for PTC type conductive polymers used in electrical switching and protection devices, comprises a polymer sheet sandwiched between highly flexible metal contact electrodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1998142006 DE19842006A1 (en) | 1998-09-15 | 1998-09-15 | Contact structure, for PTC type conductive polymers used in electrical switching and protection devices, comprises a polymer sheet sandwiched between highly flexible metal contact electrodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE19842006A1 true DE19842006A1 (en) | 2000-03-16 |
Family
ID=7880900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1998142006 Withdrawn DE19842006A1 (en) | 1998-09-15 | 1998-09-15 | Contact structure, for PTC type conductive polymers used in electrical switching and protection devices, comprises a polymer sheet sandwiched between highly flexible metal contact electrodes |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE19842006A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1231613A1 (en) * | 2001-02-08 | 2002-08-14 | Abb Research Ltd. | Resistance elements showing PTC-behaviour |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1808579A1 (en) * | 1967-11-14 | 1969-07-31 | Lignes Telegraph Telephon | Method of applying electrical contacts to metal films and thereafter obtained thin-film resistance |
| DE2948349A1 (en) * | 1978-12-01 | 1980-06-12 | Raychem Corp | PTC DEVICE WITH OXYGEN BARRIERS |
| US4780598A (en) * | 1984-07-10 | 1988-10-25 | Raychem Corporation | Composite circuit protection devices |
| US5382938A (en) * | 1990-10-30 | 1995-01-17 | Asea Brown Boveri Ab | PTC element |
-
1998
- 1998-09-15 DE DE1998142006 patent/DE19842006A1/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1808579A1 (en) * | 1967-11-14 | 1969-07-31 | Lignes Telegraph Telephon | Method of applying electrical contacts to metal films and thereafter obtained thin-film resistance |
| DE2948349A1 (en) * | 1978-12-01 | 1980-06-12 | Raychem Corp | PTC DEVICE WITH OXYGEN BARRIERS |
| US4780598A (en) * | 1984-07-10 | 1988-10-25 | Raychem Corporation | Composite circuit protection devices |
| US5382938A (en) * | 1990-10-30 | 1995-01-17 | Asea Brown Boveri Ab | PTC element |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1231613A1 (en) * | 2001-02-08 | 2002-08-14 | Abb Research Ltd. | Resistance elements showing PTC-behaviour |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| 8141 | Disposal/no request for examination |