DE19945012B4 - Voltage-dependent resistor with an overcurrent protection - Google Patents

Voltage-dependent resistor with an overcurrent protection Download PDF

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Publication number
DE19945012B4
DE19945012B4 DE1999145012 DE19945012A DE19945012B4 DE 19945012 B4 DE19945012 B4 DE 19945012B4 DE 1999145012 DE1999145012 DE 1999145012 DE 19945012 A DE19945012 A DE 19945012A DE 19945012 B4 DE19945012 B4 DE 19945012B4
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Germany
Prior art keywords
voltage
cross
dependent resistor
overcurrent protection
sectional constriction
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Expired - Fee Related
Application number
DE1999145012
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German (de)
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DE19945012A1 (en
Inventor
Johannes Zach
Siegfried Scharf
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TDK Electronics AG
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Epcos AG
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Priority to DE1999145012 priority Critical patent/DE19945012B4/en
Publication of DE19945012A1 publication Critical patent/DE19945012A1/en
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Publication of DE19945012B4 publication Critical patent/DE19945012B4/en
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/0241—Structural association of a fuse and another component or apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/048—Fuse resistors
    • H01H2085/0486—Fuse resistors with voltage dependent resistor, e.g. varistor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/05—Component parts thereof
    • H01H85/055—Fusible members
    • H01H85/08—Fusible members characterised by the shape or form of the fusible member
    • H01H85/10—Fusible members characterised by the shape or form of the fusible member with constriction for localised fusing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/20—Bases for supporting the fuse; Separate parts thereof
    • H01H85/201—Bases for supporting the fuse; Separate parts thereof for connecting a fuse in a lead and adapted to be supported by the lead alone

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Thermistors And Varistors (AREA)
  • Details Of Resistors (AREA)

Abstract

Spannungsabhängiger Widerstand (1), der aus einem keramischen Körper (2) und daran angebrachten Anschlußdrähten (3, 4) besteht und der mit einer Überstromsicherung versehen ist, wobei die Überstromsicherung gebildet ist durch eine Querschnittsverengung (5), die in zumindest einem Anschlußdraht vorgesehen ist.Voltage-dependent resistor (1) consisting of a ceramic body (2) and connecting wires (3, 4) attached thereto and provided with an overcurrent protection, the overcurrent protection being constituted by a cross-sectional constriction (5) provided in at least one connecting wire is.

Figure 00000001
Figure 00000001

Description

Die Erfindung betrifft einen spannungsabhängiger Widerstand (Varistor), der aus einem keramischen Körper und daran angebrachten Anschlußdrähten besteht, und der mit einer Überstromsicherung versehen ist. Der artige Bauelemente sind beispielweise bekannt aus der Druckschrift Elektronik II – Bauelemente; R. Pflaum Verlag, München; 2. Auflage 1984. Seiten 440–441.The Invention relates to a voltage-dependent resistor (varistor), the one made of a ceramic body and attached wires, and the one with an overcurrent fuse is provided. The like components are known, for example from the publication Elektronik II - Components; R. Pflaum Verlag, Munich; 2nd edition 1984. Pages 440-441.

Derartige Bauelemente werden mit Überstromsicherungen versehen, damit beim Auftreten eines zu Hohen Stromes das Bauelement von der Spannung getrennt werden kann.such Components are provided with overcurrent fuses provided so that when a high current to the component can be disconnected from the voltage.

Bisher wurden zu diesem Zweck Sicherungen oder Thermosicherungen eingesetzt. Diese zusätzlichen Teile verteuern jedoch den Einsatz derartiger Bauelemente. Eine Sicherung ist beispielweise beschrieben in der Druckschrift DE 692 09 518 T2 .So far, fuses or thermal fuses have been used for this purpose. However, these additional parts make the use of such components more expensive. A fuse is described for example in the document DE 692 09 518 T2 ,

In dieser Druckschrift ist eine Sicherung für einen Leistungskondensator gezeigt, die aus einem Mittelstück und zwei Anschlußstücken besteht, wobei die Anschlußstücke gegenüber dem Mittelstück durch das Verdrillen von Drähten verdickt sind.In This document is a fuse for a power capacitor shown from a center piece and two fittings, the fittings being opposite the Center piece through the twisting of wires thickened.

Aufgabe der vorliegenden Erfindung ist es, einen Varistor auf einfache Weise vor Überströmen zu sichern.task The present invention is to provide a varistor in a simple manner to protect against overflow.

Diese Aufgabe wird durch einen spannungsabhängigen Widerstand nach Patentanspruch 1 gelöst.These Task is by a voltage-dependent resistor according to claim 1 solved.

Durch Integration einer Schwachstelle im Anschlußdraht wird somit eine dynamische Sicherung ohne Verwendung zusätzlicher Schutzelemente realisiert. Der erforderliche Querschnitt ergibt sich aus dem notwendigen I2t-Wert der Schmelzsicherung.By integrating a weak point in the lead wire, a dynamic fuse is thus realized without the use of additional protection elements. The required cross section results from the necessary I 2 t value of the fuse.

Es sind zwar elektrische Bauelemente, wie beispielsweise Leistungskondensatoren, bekannt, die Abreißsicherungen mit einer Abreißstelle verminderten Querschnitts besitzen, jedoch sind diese Abreißsicherungen im Inneren eines Gehäuses angeordnet und werden bei Druckanstieg im Gehäuse an der Sollbruchstelle abgetrennt. Diese Abreißdrähte liegen zwar im Stromkreis, der unterbrochen werden soll, stellen jedoch nicht die Anschluß drähte des elektrischen Bauelements dar. Außerdem werden sie mechanisch und nicht durch Überströme ausgelöst.It Although electrical components, such as power capacitors, known, the Abreißsicherungen with a tear-off point have reduced cross-section, however, these are Abreißsicherungen inside a case arranged and are at pressure rise in the housing at the predetermined breaking point separated. These tear-off wires are lying Although in the circuit that is to be interrupted, but provide not the connection wires of the electric Component dar. Also they are triggered mechanically and not by overcurrents.

Die Erfindung wird anhand der folgenden Ausführungsbeispiele näher erläutert.The Invention will be explained in more detail with reference to the following embodiments.

In der dazugehörenden Zeichnung zeigenIn the associated Show drawing

1 einen Varistor mit einer Querschnittsverengung in einem Anschlußdraht und 1 a varistor with a cross-sectional constriction in a lead wire and

2 ein vergrößertes Detail der Querschnittsverengung. 2 an enlarged detail of the cross-sectional constriction.

In der 1 ist ein Varistor 1 dargestellt, der aus einer Keramikscheibe 2 und daran angeordneten Anschlußdrähten 3, 4 aufgebaut ist. Im Anschlußdraht 3 ist eine Querschnittsverengung 5 angeordnet, die in 2 vergrößert dargestellt ist.In the 1 is a varistor 1 shown, made of a ceramic disc 2 and connecting wires arranged thereon 3 . 4 is constructed. In the connecting wire 3 is a cross-sectional constriction 5 arranged in 2 is shown enlarged.

Die Querschnittsverengung 5 kann durch eine Quetschung oder durch einen mechanischen Abtrag, wie zum Beispiel Schleifen, Fräsen, Erodieren oder Ziehen, hergestellt sein.The cross-sectional constriction 5 may be produced by crushing or mechanical abrasion, such as grinding, milling, eroding or pulling.

Die Verengung ergibt sich aus dem erforderlichen I2t-Wert, der in Abhängigkeit von der gewünschten Stromgröße in Abhängigkeit vom Werkstoff des Anschlußdrahtes leicht berechnet werden kann.The constriction results from the required I 2 t value, which can be easily calculated depending on the desired current size depending on the material of the lead wire.

Der Ort der Querschnittsverengung ist je nach Anwendung frei wählbar, er muß nur im Hauptstromkreis des Varistors liegen.Of the Location of the cross-sectional constriction is freely selectable depending on the application, he only has to lie in the main circuit of the varistor.

Um die Auslösewahrscheinlichkeit zu erhöhen, können weiterhin auch mehrere Querschnittsverengungen, beispielsweise in jedem der Anschlußdrähte eine, in Serie angeordnet werden.Around the triggering probability to increase, can Furthermore, several cross-sectional constrictions, for example in each of the connecting wires one, be arranged in series.

Claims (4)

Spannungsabhängiger Widerstand (1), der aus einem keramischen Körper (2) und daran angebrachten Anschlußdrähten (3, 4) besteht und der mit einer Überstromsicherung versehen ist, wobei die Überstromsicherung gebildet ist durch eine Querschnittsverengung (5), die in zumindest einem Anschlußdraht vorgesehen ist.Voltage-dependent resistance ( 1 ), which consists of a ceramic body ( 2 ) and attached wires ( 3 . 4 ) and which is provided with an overcurrent fuse, wherein the overcurrent protection is formed by a cross-sectional constriction ( 5 ), which is provided in at least one connecting wire. Spannungsabhängiger Widerstand nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsverengung (5) durch eine Quetschung hergestellt ist.Voltage-dependent resistor according to Claim 1, characterized in that the cross-sectional constriction ( 5 ) is produced by a pinch. Spannungsabhängiger Widerstand nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsverengung (5) durch einen mechanischen Abtrag hergestellt ist.Voltage-dependent resistor according to Claim 1, characterized in that the cross-sectional constriction ( 5 ) is produced by a mechanical abrasion. Spannungsabhängiger Widerstand nach Anspruch 3, dadurch gekennzeichnet, daß die Querschnittsverengung (5) durch Schleifen, Fräsen, Erodieren oder Ziehen hergestellt ist.Voltage-dependent resistor according to Claim 3, characterized in that the cross-sectional constriction ( 5 ) is made by grinding, milling, eroding or pulling.
DE1999145012 1999-09-20 1999-09-20 Voltage-dependent resistor with an overcurrent protection Expired - Fee Related DE19945012B4 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150270086A1 (en) * 2014-03-20 2015-09-24 Tsan-Chi Chen Surge protector with safety mechanism

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148863B4 (en) * 2001-10-04 2007-07-05 Tyco Electronics Logistics Ag Electronic device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69209518T2 (en) * 1991-11-18 1996-11-21 Asea Brown Boveri Ab, Vaesteraas METHOD FOR PRODUCING A MELT-FUSE
FR2758420A1 (en) * 1997-01-15 1998-07-17 Soule Materiel Electr Varistor for low voltage line protection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69209518T2 (en) * 1991-11-18 1996-11-21 Asea Brown Boveri Ab, Vaesteraas METHOD FOR PRODUCING A MELT-FUSE
FR2758420A1 (en) * 1997-01-15 1998-07-17 Soule Materiel Electr Varistor for low voltage line protection

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Fachkunke Informations- und Industrieelektronik, Verlag Europa-Lehrmittel, Europa-Nr.32319, 4.Aufl. 1989, ISBN 3-8085-3244-0 *
FROHN,M. [u.a.]. Elektronik II - Bauelemente. 2.Aufl., München: R.Pflaum Verlag KG, 1984. S.440,441 ISBN 3-7905-0428-9 *
FROHN,M. [u.a.]. Elektronik II - Bauelemente. 2.Aufl., München: R.Pflaum Verlag KG, 1984. S.440,441 ISBN 3-7905-0428-9 Fachkunke Informations- und Industrieelektronik, Verlag Europa-Lehrmittel, Europa-Nr.32319, 4.Aufl. 1989, ISBN 3-8085-3244-0

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150270086A1 (en) * 2014-03-20 2015-09-24 Tsan-Chi Chen Surge protector with safety mechanism

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8364 No opposition during term of opposition
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20150401