DE937178C - Resistance with negative temperature coefficient - Google Patents
Resistance with negative temperature coefficientInfo
- Publication number
- DE937178C DE937178C DEN1630A DEN0001630A DE937178C DE 937178 C DE937178 C DE 937178C DE N1630 A DEN1630 A DE N1630A DE N0001630 A DEN0001630 A DE N0001630A DE 937178 C DE937178 C DE 937178C
- Authority
- DE
- Germany
- Prior art keywords
- temperature coefficient
- negative temperature
- resistance
- thermistor
- resistor
- 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
Links
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
- H01C7/04—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 having negative temperature coefficient
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Description
Von einem elektrischen Heißleiter, bekanntlich ein Widerstand mit negativem Temperaturkoeffizienten, wird einerseits eine große thermische Zeitkonstante, d. h. große Verzögerungszeiten beim Zuführen elektrischer Leistung,. und andererseits eine möglichst rasche Abkühlung auf den Ausgangswert beim Abschalten der elektrischen Leistung gefordert.From an electrical thermistor, known to have a resistor negative temperature coefficient, on the one hand there is a large thermal time constant, d. H. long delay times when supplying electrical power. and on the other hand cooling down to the initial value as quickly as possible when the electrical system is switched off Performance demanded.
Es sind nun elektrische Heißleiter bekannt, die ein vollkommen dichtes Gefüge und eine glatte Oberfläche haben. Diese Heißleiter haben aber den Nachteil, daß sie eine sehr kleine thermische Zeitkonstante besitzen, d. h. daß sie nach dem Zuführen des elektrischen Stromes sehr schnell ansprechen, und nach der Abschaltung der elektrischen Leistung sich nur sehr langsam abkühlen.There are now known electrical thermistors, which are a completely tight Have a structure and a smooth surface. However, these thermistors have the disadvantage that they have a very small thermal time constant; d. H. that after the Applying the electric current respond very quickly, and after switching off the electrical power cool down only very slowly.
Es ist nun Aufgabe der vorliegenden Erfindung, diesen Nachteil bei einem Widerstand mit negativem Temperaturkoeffizienten zu vermeiden. Erfindungsgemäß wird der Widerstand zur Steigerung der Wärmeabführung mit einer in einem solchen Maß rauh ausgebildeten Oberfläche versehen, daß die Anheiz- und Abkühlungscharakteristiken des Widerstandes, insbesondere eines Widerstandes mit geringer Porosität, durch die gesteigerte Wärmeabführung wesentlich beeinflußt werden.It is now the object of the present invention to address this disadvantage to avoid a resistor with a negative temperature coefficient. According to the invention will increase the resistance to heat dissipation with one in such Degree of rough surface provided that the heating and cooling characteristics of the resistor, especially a resistor with low porosity the increased heat dissipation can be significantly influenced.
Es sind nun zwar bereits Heißleiter mit porösem Gefüge bekannt. Die Poren haben aber bei diesem bekannten Heißleiter den Zweck, -beim Brennvorgang für eine genügende Durchoxydation oder -reduktion zu sorgen. Die Forderung nach einer möglichst raschen Abkühlung nach dem Abschalten der elektrischen Ldistung kann mit einem porösen Gefüge nur sehr schlecht erfüllt werden, da die in den Poren eingeschlossene Luft die Wärmeableitung an die Oberfläche sehr stark behindert.It is true that thermistors with a porous structure are already known. the In this known thermistor, however, pores have the purpose of during the burning process for to ensure sufficient thorough oxidation or reduction. The demand for one Cooling down as quickly as possible after the electrical power has been switched off can be used with a porous structure can only be met very poorly, since the ones enclosed in the pores Air greatly impedes the dissipation of heat to the surface.
Der erfindungsgemäße Heißleiter dagegen hat eine große thermische Zeitkonstante und kühlt sich infolge der Rauhigkeit der Oberfläche schnell ab. Durch die Rauhigkeit wird die wirksame Oberfläche des Heißleiters wesentlich vergrößert, so daß bei dem erfindungsgemäßen Heißleiter eine schnelle Wärmeableitung erzielt wird. Außerdem wird die an der rauhen Oberfläche vorbeistreichende Luft in turbulente Strömung versetzt, die die Wärme von der Oberfläche des Heißleiters rasch abführt.The thermistor according to the invention, however, has a large thermal Time constant and cools down quickly due to the roughness of the surface. By the roughness increases the effective surface of the thermistor considerably, so that with the thermistor according to the invention a rapid dissipation of heat is achieved will. In addition, the air flowing past the rough surface becomes turbulent Flow that quickly dissipates the heat from the surface of the thermistor.
Die Erfindung kann bei allen Arten von Heißleitern Anwendung finden, beispielsweise bei Heißleitern, welche vorzugsweise aus Eisenoxyden, z. B. Fei O4, in Verbindung mit Erdalkalikärbonaten oder Oxyden, beispielsweise Bariumkarbonät und Titandioxyd in beliebigen Modifikatioren, bestehen und durch oxydierenden Brand hergestellt sind. Die Größe des gesamten Porenraumes beträgt zweckmäßigerweise weniger als 50/0, vorzugsweise 2% des gesamten Heißleiterraumes. Die durch die Rauhigkeit vergrößerte wirksame Oberfläche ist dann mindestens doppelt so groß wie die glatte Oberfläche der bekannten Heißleiter.The invention can be used with all types of thermistors, for example, with thermistors, which are preferably made of iron oxides, z. B. Fei O4, in connection with alkaline earth carbonates or oxides, for example barium carbonate and titanium dioxide in any desired modification, exist and by oxidizing fire are made. The size of the entire pore space is expediently less than 50/0, preferably 2% of the total thermistor space. The roughness The enlarged effective surface is then at least twice as large as the smooth one Surface of the well-known thermistor.
In der Zeichnung ist ein Heißleiter der üblichen Bauweise dargestellt. Wie daraus ersichtlich, ist der Heißleiter gemäß der Erfindung mit einer rauhen Oberfläche 2 versehen.In the drawing, a thermistor of the usual design is shown. As can be seen from this, the thermistor according to the invention is rough Surface 2 provided.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEN1630A DE937178C (en) | 1950-08-08 | 1950-08-08 | Resistance with negative temperature coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEN1630A DE937178C (en) | 1950-08-08 | 1950-08-08 | Resistance with negative temperature coefficient |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE937178C true DE937178C (en) | 1955-12-29 |
Family
ID=7337790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEN1630A Expired DE937178C (en) | 1950-08-08 | 1950-08-08 | Resistance with negative temperature coefficient |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE937178C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1216972B (en) * | 1960-07-25 | 1966-05-18 | Siemens Ag | Electrical resistance for high pulse loads |
| DE3334922A1 (en) * | 1982-09-30 | 1984-04-05 | Dale Electronics, Inc., Columbus, Nebr. | RESISTANCE WITH A HIGH RESISTANCE FILM AND METHOD FOR PRODUCING THE SAME |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE471978C (en) * | 1919-06-01 | 1929-02-20 | Rudolf Schnabel | Process for the production of ceramic electrical resistors |
-
1950
- 1950-08-08 DE DEN1630A patent/DE937178C/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE471978C (en) * | 1919-06-01 | 1929-02-20 | Rudolf Schnabel | Process for the production of ceramic electrical resistors |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1216972B (en) * | 1960-07-25 | 1966-05-18 | Siemens Ag | Electrical resistance for high pulse loads |
| DE3334922A1 (en) * | 1982-09-30 | 1984-04-05 | Dale Electronics, Inc., Columbus, Nebr. | RESISTANCE WITH A HIGH RESISTANCE FILM AND METHOD FOR PRODUCING THE SAME |
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