DE2331708A1 - Overload protection circuit with PTC resistor in series with load - uses sharp step in resistor temperature resistance characteristics - Google Patents

Overload protection circuit with PTC resistor in series with load - uses sharp step in resistor temperature resistance characteristics

Info

Publication number
DE2331708A1
DE2331708A1 DE19732331708 DE2331708A DE2331708A1 DE 2331708 A1 DE2331708 A1 DE 2331708A1 DE 19732331708 DE19732331708 DE 19732331708 DE 2331708 A DE2331708 A DE 2331708A DE 2331708 A1 DE2331708 A1 DE 2331708A1
Authority
DE
Germany
Prior art keywords
ptc
series
resistor
several
load
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.)
Pending
Application number
DE19732331708
Other languages
German (de)
Inventor
Gerd Rudi Willi Ebinger
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DE19732331708 priority Critical patent/DE2331708A1/en
Publication of DE2331708A1 publication Critical patent/DE2331708A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H02H9/026—Current limitation using PTC resistors, i.e. resistors with a large positive temperature coefficient

Abstract

The overload protection circuit consists of a PTC resistor in series with the load. The PTC resistor has a sharp step in its temperature/resistance characteristics so that it acts almost as a cut-out. For higher currents several such PTC resistors may be coupled in parallel with one another and in series with the load. For higher voltages several such PTC resistors may be connected in series. Where several PTC resistors are used, they are mounted on a common base-plate whose load terminals are mutually insulated, thus providing a protective divider.

Description

Erfinder: Gerd Ebinger, 2 Hamburg 61, Teutonenweg 81 Beschreibung : Kurzschlußsicherung von StromkreisenInventor: Gerd Ebinger, 2 Hamburg 61, Teutonenweg 81 Description : Short-circuit protection of electrical circuits

mittels PTC-Widerstände.by means of PTC resistors.

Die Erfindung betrifft die Verwendung von PTC-Widerständen, mit einem scharfen Kennlinienkniek in der Widerstands/ Temperaturkennlinie, als Sicherungselement zur Sicherung von elektrischenrStromkreisen. Von der KlemmeO) fließt ein Strom über den PTC-WiderstandC 1) und die Verbrauchtere 2) zur Klemmeζ4). Beim Anlegen einer Wechselspannung fließt der Strom auch entgegengesetzt.The invention relates to the use of PTC resistors, with a sharp Kennlinienkniek in the resistance / temperature characteristic, as a securing element for securing elektrischenrStromkreisen. A current flows from terminal O) via PTC resistor C 1) and the consumer 2) to terminal 4). When an alternating voltage is applied, the current also flows in the opposite direction.

Werden die Verbrauchet2) kurzgeschlossen, so erwärmt sich der PTC-Widerstand(1) schnell durch den zu großen Kurzschlußstrom und ändert nach dem Erreichen des Kennlinienknickes seinen Widerstand um einige Größenordnungen, Nun wird der PTC-Widerstand durch den Reststrom auf hoher Temperatur gehalten. Nach dem Unterbrechen de» Stromes, zum Beispiel durch Abschalten, hat in wenigen Sekunden der PTC-Widerstand seinen Kaltwiderstand erreicht.If the consumables2) are short-circuited, they heat up the PTC resistor (1) quickly due to the excessive short-circuit current and changes its resistance by a few orders of magnitude after reaching the kink in the characteristic curve. Now the PTC resistance kept at a high temperature by the residual flow. After the current has been interrupted, for example by switching off, the PTC resistor has reached its cold resistance in a few seconds.

Vorteile dieser Anordnung sind, daß der heruntergeregelte Kurzschlußstrom wesentlich kleiner als der zuvor geflossene Betriebstrom ist. Halbleiterkühlkörper und Leiterbahnen brauchen nicht für den Kurzschlußfall dimensioniert zu werden, weil andauernde Kurzschlußströme nicht auftreten können. Da diese Art der Sicherung selbstheilend ist,braucht der PTC-Widerstand nicht zugänglich montiert zu werden und kann wegen der geringen Verlustleistung in gedruckte Schaltungen und Module eingelötet werden.The advantages of this arrangement are that the down-regulated short-circuit current is significantly smaller than the operating current that previously flowed. Semiconductor heat sinks and conductor tracks do not need to be dimensioned for the event of a short circuit, because permanent short circuit currents cannot occur. Since this type of fuse is self-healing, the PTC resistor does not need to be mounted in an accessible manner and can be soldered into printed circuits and modules because of the low power dissipation.

_ P —_ P -

409883/0095409883/0095

Für die Anwendung in Sicherungsverteilem, zum Beispiel in Kraftfahrzeugen, können mehrere PTO-Widerstände-Schichten (6,7,8 und n) auf einer gemeinsamen leitenden Grundplatte(5) aufgebracht werden. Die Anschlüsse(9»1o,11 und m) der PTC-Widerstandschichten(6,7|8 und n) zu den Verbrauchern werden getrennt herausgeführt.For use in fuse distributors, for example in Motor vehicles can have multiple layers of PTO resistors (6,7,8 and n) are applied to a common conductive base plate (5). The connections (9 »1o, 11 and m) of the PTC resistance layers (6,7 | 8 and n) to the consumers led out separately.

In einem elektronischen Spielzeuggerät wurde ein PTC-SA PTC-S Wideretand der Pa. Valvo mit dem Typ 8222 298 71521Resisted the Pa. Valvo with the type 8222 298 71521

yerwendet.used.

Kaltwiderstand: 1,6 Ohm Cold resistance: 1.6 ohms

Spannungsabfall Maximal 15 Volt Voltage drop 15 volts maximum

Verlustleistung maximal 400 mW Power loss maximum 400 mW

Betriebst roe ohne zusätzliche Kühlung bis 400 mA. Operating roe without additional cooling up to 400 mA.

Patentansprüche:Patent claims:

409883/0095409883/0095

Claims (1)

Patentansprüche:Patent claims: Ansprucb/i.) Schaltungsanordnung zum Absichern von Stromkreisen, in welchen bei einem Kurzschluß der Kurzschlußstrom auf einen geringen Reststrom reduziert wird, ohne daß der PTC-Widerstand als Sicherung zerstört wird, dadurch gekennzeichnet, daß ein PTC-Widerstand(1), der einen scharfen Knick in der Temperatur/ Widerstandskennlinie aufweist, in Reihe zu den abzusichernden Verbrauchem(2) geschaltet wird, und der sich im Falle eines Kurzschlusses durch den Kurzschlußstrom erwärmt und daraufhin seinen Eigenwiderstand um einige Größenordnungen erhöht. Claims / i.) Circuit arrangement for protecting circuits, in which, in the event of a short circuit, the short circuit current is reduced to a low residual current without the PTC resistor being destroyed as a fuse, characterized in that a PTC resistor (1), the one has a sharp bend in the temperature / resistance characteristic, is connected in series with the consumers (2) to be protected, and which, in the event of a short circuit, heats up due to the short-circuit current and then increases its intrinsic resistance by several orders of magnitude. Anspruch 2. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der PTG-Widerstandd) zur Erhöhung des Stromes durch den Verbraucher(2) aus mehreren PTC-Widerständen besteht. Claim 2. Circuit arrangement according to claim 1, characterized in that the PTG resistord) to increase the current through the consumer (2) consists of several PTC resistors. Anspruch 5» Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß der PTC-Widerstand(i) zur Vergrößerung des Spannungsbereiches aus mehreren in Reihe geschalteten PTC-Widerständen besteht. Claim 5 » Circuit arrangement according to Claim 1, characterized in that the PTC resistor (i) consists of several PTC resistors connected in series to increase the voltage range. Anspruch 4·. Schaltungsanordnung nach Anspruch 1, dadurch gekennzeichnet, daß mehrere PTC-Widerstände(6,7,8 und n) auf einergemeinsamen zuleitenden fiswstg- Grundplatte(5) aufgebracht werden, deren Anschlüsse(9»1o,11 und m) zu den Verbrauchern zueinander isoliert sind, so daß dadurch ein Sicherungsverteiler entsteht. Claim 4 ·. Circuit arrangement according to Claim 1, characterized in that several PTC resistors (6, 7, 8 and n) are applied to a common lead fiswstg base plate (5) whose connections (9 »10, 11 and m) to the consumers are isolated from one another so that a fuse distributor is created. 409883/0095409883/0095 LeerseiteBlank page
DE19732331708 1973-06-22 1973-06-22 Overload protection circuit with PTC resistor in series with load - uses sharp step in resistor temperature resistance characteristics Pending DE2331708A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19732331708 DE2331708A1 (en) 1973-06-22 1973-06-22 Overload protection circuit with PTC resistor in series with load - uses sharp step in resistor temperature resistance characteristics

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732331708 DE2331708A1 (en) 1973-06-22 1973-06-22 Overload protection circuit with PTC resistor in series with load - uses sharp step in resistor temperature resistance characteristics

Publications (1)

Publication Number Publication Date
DE2331708A1 true DE2331708A1 (en) 1975-01-16

Family

ID=5884716

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19732331708 Pending DE2331708A1 (en) 1973-06-22 1973-06-22 Overload protection circuit with PTC resistor in series with load - uses sharp step in resistor temperature resistance characteristics

Country Status (1)

Country Link
DE (1) DE2331708A1 (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408244A (en) * 1978-06-08 1983-10-04 Suddeutsche Kuhlerfabrik Julius Fr. Behr Gmbh & Co. Kg Circuit safe against overload for varying the amount of power to an electric blower motor
US4450496A (en) * 1979-08-16 1984-05-22 Raychem Corporation Protection of certain electrical systems by use of PTC device
US4467310A (en) * 1983-10-03 1984-08-21 Northern Telecom Limited Telephone subscriber line battery feed resistor arrangements
EP0035808B1 (en) * 1980-03-12 1985-01-30 Koninklijke Philips Electronics N.V. Current-measuring arrangement with overload protection
EP0150502A2 (en) * 1984-02-02 1985-08-07 VDO Adolf Schindling AG Electric circuit
WO1990000825A1 (en) * 1988-07-15 1990-01-25 Raychem Corporation Assemblies of ptc circuit protection devices
GB2224402B (en) * 1988-10-17 1993-06-02 Gte Prod Corp Solid state station protector device
DE4428115A1 (en) * 1994-08-09 1996-02-15 Hella Kg Hueck & Co Control unit with a circuit arrangement for protecting the control unit when the control unit mass is interrupted
WO2000072332A1 (en) * 1999-05-20 2000-11-30 Bourns, Inc. Junction box with over-current protection

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4408244A (en) * 1978-06-08 1983-10-04 Suddeutsche Kuhlerfabrik Julius Fr. Behr Gmbh & Co. Kg Circuit safe against overload for varying the amount of power to an electric blower motor
US4450496A (en) * 1979-08-16 1984-05-22 Raychem Corporation Protection of certain electrical systems by use of PTC device
EP0035808B1 (en) * 1980-03-12 1985-01-30 Koninklijke Philips Electronics N.V. Current-measuring arrangement with overload protection
US4467310A (en) * 1983-10-03 1984-08-21 Northern Telecom Limited Telephone subscriber line battery feed resistor arrangements
EP0150502A2 (en) * 1984-02-02 1985-08-07 VDO Adolf Schindling AG Electric circuit
EP0150502A3 (en) * 1984-02-02 1986-07-16 Vdo Adolf Schindling Ag Electric circuit
WO1990000825A1 (en) * 1988-07-15 1990-01-25 Raychem Corporation Assemblies of ptc circuit protection devices
US4967176A (en) * 1988-07-15 1990-10-30 Raychem Corporation Assemblies of PTC circuit protection devices
GB2224402B (en) * 1988-10-17 1993-06-02 Gte Prod Corp Solid state station protector device
DE4428115A1 (en) * 1994-08-09 1996-02-15 Hella Kg Hueck & Co Control unit with a circuit arrangement for protecting the control unit when the control unit mass is interrupted
WO2000072332A1 (en) * 1999-05-20 2000-11-30 Bourns, Inc. Junction box with over-current protection
US6249412B1 (en) 1999-05-20 2001-06-19 Bourns, Inc. Junction box with over-current protection

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