DE2821402A1 - PTC RESISTOR FOR USE AS A CURRENT-LIMITING ORGAN IN AN ELECTRICAL CIRCUIT - Google Patents

PTC RESISTOR FOR USE AS A CURRENT-LIMITING ORGAN IN AN ELECTRICAL CIRCUIT

Info

Publication number
DE2821402A1
DE2821402A1 DE19782821402 DE2821402A DE2821402A1 DE 2821402 A1 DE2821402 A1 DE 2821402A1 DE 19782821402 DE19782821402 DE 19782821402 DE 2821402 A DE2821402 A DE 2821402A DE 2821402 A1 DE2821402 A1 DE 2821402A1
Authority
DE
Germany
Prior art keywords
current
ptc resistor
electrical circuit
resistor
ptc
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Withdrawn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
DE19782821402
Other languages
German (de)
Inventor
Walter Lorenz Adolf Jordan
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.)
POLYAMP SOLLENTUNA SE AB
Original Assignee
TRANSMICRO SCANDINAVIA AB
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 TRANSMICRO SCANDINAVIA AB filed Critical TRANSMICRO SCANDINAVIA AB
Publication of DE2821402A1 publication Critical patent/DE2821402A1/en
Withdrawn legal-status Critical Current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
    • H01C7/02—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 positive temperature coefficient
    • H01C7/027—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 positive temperature coefficient consisting of conducting or semi-conducting material dispersed in a non-conductive organic material
    • 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
    • H01C7/02—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 positive temperature coefficient
    • H01C7/022—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 positive temperature coefficient mainly consisting of non-metallic substances

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Thermistors And Varistors (AREA)
  • Details Of Resistors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Description

LEINWEBER & ZIMMERMANNLEINWEBER & ZIMMERMANN

282UQ2282UQ2

PATENTANWÄLTEPATENT LAWYERS

Dipl.-Ing. H. Leinweber (1930-7« Dipl.-Ing. Heinz Zimmermann Dipl.-Ing. A. Gf. v. WengerskyDipl.-Ing. H. Leinweber (1930-7 " Dipl.-Ing. Heinz Zimmermann Dipl.-Ing. A. Gf. v. Wengersky

Rosental 7 · D-8000 München 2Rosental 7 D-8000 Munich 2

2. Aufgang (Kustermann-Passage) Telefon (089) 2603989 Telex 528191 lepatd
Telegr.-Adr. Leinpat München2. Entrance (Kustermann-Passage) Telephone (089) 2603989 Telex 528191 lepatd
Telegr. Addr. Leinpat Munich

den 1b. Mai the 1b. May

Unser ZeichenOur sign

Wy/SdWy / Sd

Transmicro Scandinavia AB, 161 56 Bromma / Schweden PTC-Widerstand zur Verwendung als strombegrenzendes Organ in einem elektrischen StromkreisTransmicro Scandinavia AB, 161 56 Bromma / Sweden PTC resistor for use as a current-limiting element in an electrical circuit

Die vorliegende Erfindung bezieht sich auf einen zur Verwendung als strombegrenzendes Organ in einem elektrischen Stromkreis geeigneten PTC-Widerstand.The present invention relates to one for use as a current-limiting element in an electrical Circuit suitable PTC resistor.

Mit PTC-Widerstand oder, wie dieser auch genannt wird, PTC-Thermistor, wird ein gewöhnlicherweise aus einem halbleitenden, keramischen Material bestehender Widerstand mit positivem Temperaturkoeffizient bezeichnet, dessen Widerstandswert bei niedrigen Temperaturen niedrig ist, während er bei höheren Temperaturen um mehrere Zehnerpotenzen steil ansteigt. Diese Eigenschaft eines PTC-Widerstandes macht ihn gut geeignet zur Verwendung als strombegrenzendes Organ in verschiedenen Arten von elektrischen Stromkreisen, um beispielsweise bei einem Kurzschluß zu verhindern, daß ein unzulässig hoher Strom während mehr als einer kurzen, sehr begrenzten Zeitperiode fließen kann.A PTC resistor or, as it is also called, PTC thermistor, is usually made of a semiconducting, ceramic material existing resistor with a positive temperature coefficient, its resistance value is low at low temperatures, while at higher temperatures it is steep by several powers of ten increases. This property of a PTC resistor makes it well suited for use as a current-limiting device in various types of electrical circuits, for example to prevent a Inadmissibly high current can flow for more than a short, very limited period of time.

— 2 —- 2 -

809848/0803809848/0803

282H02282H02

Ein lachteil der bisher bekannten PTC-Widerstände besteht in folgendem: Wenn ein derartiger Widerstand in einem Stromkreis eingeschaltet ist, in dem auch bei normalem Betrieb eine hohe Stromstärke kurzzeitig auftreten kann, z.B. zufolge einer in den Stromkreis eingeschalteten induktiven Belastung, muß der PTC-Widerstand so dimensioniert werden, daß er einen wesentlich höheren .Strom alt; den im Stromkreis normal auftretenden Dauerstrom vertragen kann. Das bringt aber das Risiko mit sich, daß der Stromkreis nach Eintritt eines Fehlers weiter arbeitet, und zwar mit einem wesentlich höheren kontinuierlichen Strom als beabsichtigt, ohne daß der PTC-Widerstand reagiert und die gewünschte Herabsetzung oder Drosselung des Stromes durch Übergang des PTC-Widerstandes von seinem Bereich niedrigen Widerstands-/zu dem Bereich hohen Widerstandswertes erfolgt. Vorbekannte PTC-Widerstände mit am Widerstandskörper durch Löten angebrachten Anschlußleitungen sind auch mit dem weiteren Nachteil verbunden, daß erhebliche, thermisch bedingte mechanische Spannungen in den an die Lötstellen angrenzenden Teilen des Widerstandskörpers auftreten. Das geschieht aufgrund der hohen Stromkonzentration in diesen Teilen im Verhältnis zu den übrigen Teilen des Widerstandskörper.A disadvantage of the previously known PTC resistors is the following: If such a resistor is in a The circuit is switched on, in which a high current intensity can briefly occur even during normal operation, e.g. as a result of an inductive load switched into the circuit, the PTC resistor must be dimensioned so that it has a much higher current old; those that occur normally in the circuit Can tolerate continuous current. However, this brings with it the risk that the circuit will break after an error has occurred continues to operate, with a much higher continuous current than intended, without the PTC resistor reacts and the desired reduction or throttling of the current by moving the PTC resistor from its range low resistance / to the high resistance area. Previously known PTC resistors with the resistor body Connection lines attached by soldering are also available with the Another disadvantage is that considerable, thermally induced mechanical stresses in the areas adjacent to the soldered joints Parts of the resistance body occur. This happens due to the high current concentration in these parts in proportion to the remaining parts of the resistor body.

Zweck der Erfindung ist, einen verbesserten PTC-Widerstand zur Verwendung als strombegrenzendes Organ in einem elektrischen Stromkreis zu schaffen, bei dem die vorerwähnten Nachteile eliminiert oder zumindest stark reduziert sind. Ein gemäß der Erfindung zu diesem Zweck vorgeschlagener PTC-Widerstand wird dadurch gekennzeichnet, daß er einen Bestandteil eines vorgefertigten Bauelements darstellt, dessen gesamte physische Masse durch Umhüllung des Widerstandskörpers des PTC-Widerstandes mittels mindestens eines wärmeleitenden zusätzlichen Materials über die eigene physische Masse des Widerstandskörper hinaus vergrößert ist.The purpose of the invention is to provide an improved PTC resistor for use as a current-limiting element in one To create an electrical circuit in which the aforementioned disadvantages are eliminated or at least greatly reduced. A PTC resistor proposed according to the invention for this purpose is characterized in that it is a component of a prefabricated component, the entire physical mass of which is covered by the resistance body of the PTC resistor by means of at least one additional thermally conductive material over the own physical mass of the Resistance body is also enlarged.

809848/0803809848/0803

282H02282H02

Die gemäß der Erfindung vorgeschlagene Umhüllung des Widerstandskörpers des PTC-Widerstandes mittels eines wärmeleitenden zusätzlichen Materials oder Mittels führt dazu, daß der PTC-Widerstand eine gesteigerte thermische/Trägheit erhält. Dadurch ist es nicht mehr nötig, in gewissen Anwendungen überdimeräonierte PTC-Widerstände zu verwenden. Es wird überdies die Verwendung von PTC-Widerständen als strombegrenzende Elemente in vielen Anwendungen ermöglicht, wo dies früher überhaupt nicht möglich war. Außerdem wird durch die Erfindung eine verbesserte Wärmeableitung von den Lötstellen für am Widerstandskörper angebrachte Anschlußdrähte erzielt, wodurch die bisherigen mechanischen Spannungen in den an den Lötstellen gelegenen Teilen des Widerstandskörpers eliminiert oder wenigstens herabgesetzt werden. Die Erfindung hat auch den weiteren bedeutenden Vorteil, daß der kontinuierliche Betriebsstrom durch den PTC-Widerstand wesentlich erhöht v/erden kann.The proposed according to the invention casing of the Resistance body of the PTC resistor by means of a thermally conductive additional material or means leads to the fact that the PTC resistor has an increased thermal / inertia. As a result, it is no longer necessary to over-diminish in certain applications Use PTC resistors. There is also the use of PTC resistors as current limiting Enables elements in many applications where previously this was not possible at all. In addition, the invention an improved heat dissipation from the soldering points for attached to the resistor body connecting wires achieved, whereby the previous mechanical stresses in the parts of the resistor body located at the soldering points are eliminated or at least be reduced. The invention also has the further significant advantage that the continuous operating current can be significantly increased by the PTC resistor.

Das obeneisähnte zusätzliche Material kann beispielsweise aus einem geeigneten silikonhaltigen Material bestehen. Viele andere Arten von zusätzlichen Materialien oder Mitteln können jedoch auch verwendet werden. Hier kann insbesondere erwähnt werden, daß das zusätzliche Material oder Mittel derart beschaffen sein kann, daßfvoneäußeren Kräften beeinflußt werden kann.The above-mentioned additional material can for example consist of a suitable silicone-containing material. However, many other types of additional materials or agents can also be used. Herein may be particularly noted that the additional material or means can be such daßfvon, e external forces can be influenced.

-A--A-

809848/0803809848/0803

Claims (2)

Patentansprüche :Patent claims: 3TC-¥iderstand zur Verwendung als strombegrenzendes Organ Nhi/eineni elektrischen Stromkreis, dadurch gekennzeichnet, daß er einen Bestandteil eines prefabrizierten Elements darstellt, dessen gesamte physische Masse durch Umhüllung des Widerstandskörpers des PTC-Widerstandes mittels mindestens eines wärmeleitenden zusätzlichen Materials über die eigene physische Masse des Widerstandskörpers hinaus vergrößert ist. 3 TC- ¥ resistance for use as a current-limiting organ N hi / eini electrical circuit, characterized in that it is part of a prefabricated element, the entire physical mass of which is covered by covering the resistance body of the PTC resistor by means of at least one additional heat-conducting material over its own physical mass of the resistance body is also increased. 2. PTC-Widerstand nach Anspruch 1, dadurch gekennzeichnet, daß die Dichte des zusätzlichen Materials von äußeren Kräften beeinflußt werden kann.2. PTC resistor according to claim 1, characterized in that the density of the additional material of external forces can be influenced. 809848/0803809848/0803
DE19782821402 1977-05-17 1978-05-16 PTC RESISTOR FOR USE AS A CURRENT-LIMITING ORGAN IN AN ELECTRICAL CIRCUIT Withdrawn DE2821402A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7705838A SE413727B (en) 1977-05-17 1977-05-17 FOR USE AS A CURRENT LIMIT COMPONENT IN AN ELECTRIC CIRCUIT PROVIDED PCT RESIST

Publications (1)

Publication Number Publication Date
DE2821402A1 true DE2821402A1 (en) 1978-11-30

Family

ID=20331376

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19782821402 Withdrawn DE2821402A1 (en) 1977-05-17 1978-05-16 PTC RESISTOR FOR USE AS A CURRENT-LIMITING ORGAN IN AN ELECTRICAL CIRCUIT

Country Status (9)

Country Link
BE (1) BE867156A (en)
DE (1) DE2821402A1 (en)
DK (1) DK216478A (en)
FI (1) FI781571A (en)
FR (1) FR2391539A1 (en)
IT (1) IT1095894B (en)
NL (1) NL7805256A (en)
NO (1) NO781730L (en)
SE (1) SE413727B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015816A1 (en) * 1990-05-17 1991-11-21 Reinshagen Kabelwerk Gmbh Cable loom with connector contg. current-responsive resistors - in form of carbon filled polymer films whose resistance is increased by overcurrent
DE4101209A1 (en) * 1991-01-17 1992-07-23 Pilz Gmbh & Co SAFETY SWITCHGEAR
DE19606597A1 (en) * 1996-02-22 1997-08-28 Abb Patent Gmbh Medium or low voltage switchgear
DE19808025A1 (en) * 1998-02-26 1999-09-02 Abb Research Ltd Method for producing a PTC thermistor arrangement and use of the PTC thermistor arrangement as a current limiter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL23606A (en) * 1964-07-09 1969-11-12 Charbonnier R Electronic component with individual thermal regulation
GB1335785A (en) * 1972-07-25 1973-10-31 Standard Telephones Cables Ltd Thermistor assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4015816A1 (en) * 1990-05-17 1991-11-21 Reinshagen Kabelwerk Gmbh Cable loom with connector contg. current-responsive resistors - in form of carbon filled polymer films whose resistance is increased by overcurrent
DE4101209A1 (en) * 1991-01-17 1992-07-23 Pilz Gmbh & Co SAFETY SWITCHGEAR
DE19606597A1 (en) * 1996-02-22 1997-08-28 Abb Patent Gmbh Medium or low voltage switchgear
DE19808025A1 (en) * 1998-02-26 1999-09-02 Abb Research Ltd Method for producing a PTC thermistor arrangement and use of the PTC thermistor arrangement as a current limiter

Also Published As

Publication number Publication date
NO781730L (en) 1978-11-20
IT1095894B (en) 1985-08-17
SE7705838L (en) 1978-11-18
SE413727B (en) 1980-06-16
NL7805256A (en) 1978-11-21
BE867156A (en) 1978-11-17
DK216478A (en) 1978-11-18
FR2391539A1 (en) 1978-12-15
FI781571A (en) 1978-11-18
IT7823488A0 (en) 1978-05-17

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Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: POLYAMP AB, SOLLENTUNA, SE

8128 New person/name/address of the agent

Representative=s name: ZIMMERMANN, H., DIPL.-ING. GRAF VON WENGERSKY, A.,

8110 Request for examination paragraph 44
8130 Withdrawal