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DE19945012A1 - Varistor using excess current release, has two connection wires connected to ceramic body of which one has cross=section contraction - Google Patents

Varistor using excess current release, has two connection wires connected to ceramic body of which one has cross=section contraction

Info

Publication number
DE19945012A1
DE19945012A1 DE1999145012 DE19945012A DE19945012A1 DE 19945012 A1 DE19945012 A1 DE 19945012A1 DE 1999145012 DE1999145012 DE 1999145012 DE 19945012 A DE19945012 A DE 19945012A DE 19945012 A1 DE19945012 A1 DE 19945012A1
Authority
DE
Germany
Prior art keywords
cross
varistor
ceramic body
connection wires
excess current
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.)
Granted
Application number
DE1999145012
Other languages
German (de)
Other versions
DE19945012B4 (en
Inventor
Johannes Zach
Siegfried Scharf
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.)
TDK Electronics AG
Original Assignee
Epcos AG
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 Epcos AG filed Critical Epcos AG
Priority to DE1999145012 priority Critical patent/DE19945012B4/en
Publication of DE19945012A1 publication Critical patent/DE19945012A1/en
Application granted granted Critical
Publication of DE19945012B4 publication Critical patent/DE19945012B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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

The varistor (1) includes a ceramic body (2) with an excess current release. The ceramic body is provided with two connection wires (3,4), of which one has a cross-section contraction (5).

Description

Die Erfindung betrifft einen spannungsabhängiger Widerstand (Varistor), der aus einem keramischen Körper und daran ange­ brachten Anschlußdrähten besteht, und der mit einer Über­ stromsicherung versehen ist.The invention relates to a voltage-dependent resistor (Varistor) made of a ceramic body and attached to it brought connecting wires, and the one with an over power fuse is provided.

Derartige Bauelemente werden mit Überstromsicherungen verse­ hen, damit beim Auftreten eines zu Hohen Stromes das Bauele­ ment von der Spannung getrennt werden kann.Such components are verse with overcurrent protection hen, so when the occurrence of a too high current the component ment can be separated from the voltage.

Bisher wurden zu diesem Zweck Sicherungen oder Thermosiche­ rungen eingesetzt. Diese zusätzlichen Teile verteuern jedoch den Einsatz derartiger Bauelemente.So far, fuses or thermal fuses have been used for this purpose stanchions used. However, these additional parts make them more expensive the use of such components.

Aufgabe der vorliegenden Erfindung ist es, eine Überstromsi­ cherung für Varistoren anzugeben, die ohne Verwendung zusätz­ licher Teile realisiert ist.The object of the present invention is an overcurrent Specification for varistors that use additional Licher parts is realized.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß in zu­ mindest einem Anschlußdraht eine Querschnittsverengung vorge­ sehen ist.This object is achieved in that in at least one connecting wire has a cross-sectional constriction see is.

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

Es sind zwar elektrische Bauelemente, wie beispielsweise Lei­ stungskondensatoren, 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.There are electrical components, such as Lei Stungskondensatoren, known, the breakaway with a Tear point have a reduced cross-section, but are these breakaway devices are arranged inside a housing and are at the predetermined breaking point when the pressure in the housing rises severed. These tear wires are in the circuit, the should not be interrupted, however, do not provide the connection  wires of the electrical component. In addition, they mechanically and not triggered by overcurrents.

Die Erfindung wird anhand der folgenden Ausführungsbeispiele näher erläutert.The invention is illustrated by the following examples explained in more detail.

In der dazugehörenden Zeichnung zeigenShow in the accompanying drawing

Fig. 1 einen Varistor mit einer Querschnittsverengung in einem Anschlußdraht und Fig. 1 shows a varistor with a cross-sectional constriction in a connecting wire and

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

In der Fig. 1 ist ein Varistor 1 dargestellt, der aus einer Keramikscheibe 2 und daran angeordneten Anschlußdrähten 3, 4 aufgebaut ist. Im Anschlußdraht 3 ist eine Querschnittsveren­ gung 5 angeordnet, die in Fig. 2 vergrößert dargestellt ist.In FIG. 1, a varistor 1 is shown which is made up of a ceramic disk 2 and disposed thereon lead wires 3, 4. In the connecting wire 3 a cross-sectional supply 5 is arranged, which is shown enlarged in Fig. 2.

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 can be produced by crushing or by mechanical removal, such as grinding, milling, eroding or drawing.

Die Verengung ergibt sich aus dem erforderlichen I2t-Wert, der in Abhängigkeit von der gewünschten Stromgröße in Abhän­ gigkeit vom Werkstoff des Anschlußdrahtes leicht berechnet werden kann.The narrowing 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 connecting wire.

Der Ort der Querschnittsverengung ist je nach Anwendung frei wählbar, er muß nur im Hauptstromkreis des Varistors liegen.The location of the cross-sectional constriction is free depending on the application selectable, it only has to be 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.To increase the probability of triggering, you can continue also several cross-sectional constrictions, for example in each of the connecting wires one, arranged in series.

Claims (3)

1. Spannungsabhängiger Widerstand (Varistor) (1), der aus ei­ nem keramischen Körper (2) und daran angebrachten Anschluß­ drähten (3, 4) besteht, und der mit einer Überstromsicherung versehen ist, dadurch gekennzeichnet, daß in zumindest einem Anschlußdraht (3) eine Querschnitts­ verengung (5) vorgesehen ist.1. Voltage-dependent resistor (varistor) ( 1 ), which consists of a ceramic body ( 2 ) and wires attached to it ( 3 , 4 ), and which is provided with an overcurrent fuse, characterized in that in at least one connecting wire ( 3 ) a cross-sectional constriction ( 5 ) is provided. 2. Spannungsabhängiger Widerstand nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsverengung (5) durch eine Quetschung her­ gestellt ist.2. Voltage-dependent resistor according to claim 1, characterized in that the cross-sectional constriction ( 5 ) is provided by a pinch. 3. Spannungsabhängiger Widerstand nach Anspruch 1, dadurch gekennzeichnet, daß die Querschnittsverengung (5) durch einen mechanischen Abtrag, wie Schleifen, Fräsen, Erodieren, Ziehen oder dgl. , hergestellt ist.3. Voltage-dependent resistor according to claim 1, characterized in that the cross-sectional constriction ( 5 ) is produced by mechanical removal, such as grinding, milling, eroding, drawing or the like.
DE1999145012 1999-09-20 1999-09-20 Voltage-dependent resistor with an overcurrent protection Expired - Fee Related DE19945012B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1999145012 DE19945012B4 (en) 1999-09-20 1999-09-20 Voltage-dependent resistor with an overcurrent protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1999145012 DE19945012B4 (en) 1999-09-20 1999-09-20 Voltage-dependent resistor with an overcurrent protection

Publications (2)

Publication Number Publication Date
DE19945012A1 true DE19945012A1 (en) 2001-04-26
DE19945012B4 DE19945012B4 (en) 2009-11-12

Family

ID=7922639

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1999145012 Expired - Fee Related DE19945012B4 (en) 1999-09-20 1999-09-20 Voltage-dependent resistor with an overcurrent protection

Country Status (1)

Country Link
DE (1) DE19945012B4 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148863A1 (en) * 2001-10-04 2003-04-30 Bosch Gmbh Robert Overload protection for electrical equipment has irreversible circuit breaker in housing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201537591A (en) * 2014-03-20 2015-10-01 zan-qi Chen Surge bleeder with security mechanism

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10148863A1 (en) * 2001-10-04 2003-04-30 Bosch Gmbh Robert Overload protection for electrical equipment has irreversible circuit breaker in housing
DE10148863B4 (en) * 2001-10-04 2007-07-05 Tyco Electronics Logistics Ag Electronic device

Also Published As

Publication number Publication date
DE19945012B4 (en) 2009-11-12

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Legal Events

Date Code Title Description
OP8 Request for examination as to paragraph 44 patent law
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