EP1412953B1 - Composant electroceramique - Google Patents

Composant electroceramique Download PDF

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Publication number
EP1412953B1
EP1412953B1 EP02754320A EP02754320A EP1412953B1 EP 1412953 B1 EP1412953 B1 EP 1412953B1 EP 02754320 A EP02754320 A EP 02754320A EP 02754320 A EP02754320 A EP 02754320A EP 1412953 B1 EP1412953 B1 EP 1412953B1
Authority
EP
European Patent Office
Prior art keywords
electrical
conductor piece
component according
base body
electrical conductor
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 - Lifetime
Application number
EP02754320A
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German (de)
English (en)
Other versions
EP1412953A2 (fr
Inventor
Hermann GRÜNBICHLER
Martin Schwingenschuh
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
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Filing date
Publication date
Application filed by Epcos AG filed Critical Epcos AG
Publication of EP1412953A2 publication Critical patent/EP1412953A2/fr
Application granted granted Critical
Publication of EP1412953B1 publication Critical patent/EP1412953B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01C7/10—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 voltage responsive, i.e. varistors
    • H01C7/12—Overvoltage protection resistors
    • H01C7/126—Means for protecting against excessive pressure or for disconnecting in case of failure

Definitions

  • the invention relates to an electroceramic device with a thermal fuse.
  • Such devices include, for example, varistors.
  • the main body of such known components is often made of a mixture of different metal oxides, for example based on zinc oxide.
  • Varistors have a non-linear voltage-dependent resistance change used to protect an electrical circuit from overvoltage. The resistance of varistors decreases with increasing applied voltage.
  • a Varistor for the protection of electrical circuits against overvoltages and excess temperatures. It consists of a mechanical construction in which a low-melting solder is applied to the varistor, which fixes a resilient power supply line. Upon the occurrence of overvoltages and the associated overheating of the varistor, the solder melts, the spring construction subsequently producing an irreversible low-resistance short-circuit bridging with a second current feed line. The spring construction also increases the distance between the resilient power supply line and the varistor to prevent electrical flashover.
  • the disadvantages of this mechanical construction are that it is very difficult to implement.
  • Publication JP 04 151 804 A discloses a temperature fuse integrated in a varistor housing, which is connected via an electrical line to an inner electrode of the varistor.
  • the temperature fuse is surrounded by a material that allows heat conduction between the varistor and the temperature fuse. In the event of overheating of the varistor as a result of prolonged overvoltage, the heat of the varistor can thus be transferred to the temperature fuse and triggered.
  • the disadvantage of this design is that the thermal fuse is not in direct thermal contact with the varistor and therefore due to losses during heat transfer is triggered only at higher temperatures.
  • the invention is therefore based on the object to provide a simple thermal fuse for electroceramic devices available, which avoids the disadvantages mentioned.
  • the invention describes an electroceramic component having at least one first ceramic base body.
  • the operating voltage does not exceed a predetermined allowable limit
  • the first ceramic base body contacts the electrical conductor piece and is therefore in direct thermal contact with it.
  • the first ceramic base body heats up greatly due to the increasing power loss, so that the electrical conductor piece is heated. It is designed so that it from a certain temperature melts and thus interrupts the flow of current.
  • An electrically insulating material prevents electrical flashover between the electrically conductive regions that have been contacted by the electrical conductor piece, thus ensuring a reliable interruption of the current path.
  • the electrical conductor piece according to the invention is in direct thermal contact with the first ceramic body. For this reason, no loss of heat transfer must take place through a sheath of the first ceramic body. The overtemperature protection can therefore be triggered at lower temperatures on the first body and is thus much more sensitive than conventional fuses.
  • Another advantage results from the fact that after the melting of the electrical conductor piece, an electrical flashover according to the invention can be prevented in a simple manner by the electrically insulating material. There are no complicated mechanical spring structures needed to move the contacts apart after melting the electrical conductor piece.
  • the first base body may contain, for example, a varistor ceramic based on zinc oxide.
  • the electrical conductor piece is advantageously a low-melting solder, for example with a melting point between about 80 ° C and 180 ° C.
  • free-flowing or flowable materials such as quartz sand or glass beads can be used as the electrically insulating material.
  • an encapsulation for example made of temperature-resistant plastic such as polyphenylene sulfide (PPS) can be provided, which creates a container for the insulating free-flowing or flowable material and at the same time increases the mechanical stability of the device.
  • PPS polyphenylene sulfide
  • the entire electroceramic device with the integrated thermal fuse and the encapsulation can advantageously be enveloped by a single housing. This creates a compact device with reduced space requirements.
  • FIGS. 1A and 1B show a series connection of two varistor basic bodies 1 and 30, each with approximately 60 or 75 V operating voltage, so that an operating voltage of approximately 130 V can be realized in total.
  • the two Varistor ground stresses 1 and 30 are connected by the electrical conductor portion 10, a low melting solder having a melting point of about 80 ° C to 180 ° C, electrically conductive together.
  • the electrically insulating material 20 can advantageously be designed as quartz sand, which is arranged between the two Varistorground stressesn and surrounds the solder 10.
  • electrical contacts 5 and 15 can serve, for example, tinned copper wires.
  • a plastic ring 50 advantageously made of a temperature resistant Plastic such as polyphenylene sulfide (PPS) creates together with the two ceramic bodies 1 and 30 as a lid a cavity for the insulating material 20.
  • the cavity can be closed by a plug 50A.
  • the entire components with integrated thermal fuse can advantageously be surrounded by a housing 45, which consists for example of epoxy plastic.
  • the electrical conductor portion 10 of the device melts reliably within a few seconds.
  • the temperature at the housing of the device is only about 120 ° C. This ensures that the device does not start to burn and does not set objects in its environment on fire.
  • the use of a solder wire about 1 mm thick can withstand current surges of about 8000 A (pulse shape 8/20 ⁇ s). That is, no losses in Stromableitrac must be taken into account by the invention Overtemperaturtechnisch.
  • varistor materials 1 and 30 for example based on SiC.
  • the embodiment with the two ceramic bodies also has the advantage that a spatial separation of the electrical contacts 5 and 15 of the electrical conductor piece 10 is possible.
  • the electrical conductor piece is located in the intermediate space 35 between the two Varistor ground stressesn, while the electrical contacts each contact the gap facing away from the sides 1A, 30A Varistor ground emotions.
  • a good thermal shielding of the electrical conductor portion of the electrical contacts can be ensured, so that a high soldering heat resistance is given. This is contrary to many conventional ones Thermal fuses easy soldering or welding of electrical contacts possible without triggering the thermal fuse.
  • FIG. 2A shows a plan view and FIG. 2B shows a cross section through a varistor according to the invention with only one varistor base body 1.
  • the electrical conductor piece 10 is connected directly to the second electrical contact 15 and the varistor base body 1.
  • An advantageously designed as a plastic ring 50 creates a cavity for receiving the electrically insulating material 20, which is intended to prevent an electrical flashover between the Varistor ground stresses 1 and the second electrical contact 15 in this embodiment.
  • the entire assembly may be provided with a cover 50B which closes the component.
  • the Varistor ground stresses 1 is contacted by the first electrical contact 5.
  • This alternative embodiment exhibits similar overheating characteristics and similar current drainage capabilities as the two ceramic body embodiment.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fuses (AREA)
  • Thermistors And Varistors (AREA)
  • Insulators (AREA)
  • Ceramic Capacitors (AREA)

Claims (13)

  1. Composant électrique ayant une protection vis-à-vis des surtensions,
    - comprenant au moins un premier corps (1) de base en céramique ;
    - dans lequel un trajet de courant est défini entre un premier contact (5) électrique sur la corps (1) de base en céramique et un deuxième contact (15) électrique qui s'étend au-dessus du premier corps (1) de base en céramique et d'une pièce (10) conductrice de l'électricité, qui est en contact avec le premier corps de base en céramique et qui est en contact calorifique direct avec le premier corps de base en céramique ;
    - dans lequel la pièce (10) conductrice électrique est telle qu'elle fond lorsque la tension de fonctionnement prescrite du composant est dépassée en raison du réchauffement du premier corps de base ;
    - dans lequel une matière (20) isolante du point de vue électrique, susceptible de ruisseler ou de s'écouler, et entourant la pièce (10) conductrice électrique est disposée de façon à, lors de la fusion de la pièce (19) électrique conductrice, y pénétrer, une décharge électrique entre les parties du trajet de courant qui sont shuntées par la pièce (10) électrique conductrice étant empêchée ;
    - comprenant un encapsulage (50) pour enrober le composant.
  2. Composant électrique suivant la revendication précédente,
    - dans lequel la pièce (10) électrique conductrice est reliée au deuxième contact (15) électrique ;
    - dans lequel la matière (20) isolante du point de vue électrique est disposée entre le premier corps (1) de base en céramique et le deuxième contact (15) électrique.
  3. Composant électrique suivant la revendication 1,
    - dans lequel la pièce (10) électrique conductrice relie d'une manière conductrice de l'électricité le premier corps (1) de base à un deuxième corps (30) de base ;
    - dans lequel le premier contact (5) est disposé directement sur la premier corps (1) de base et le deuxième contact (15) est disposé directement sur le deuxième corps (30) de base ;
    - dans lequel la matière (20) isolante du point de vue électrique est disposée entre le premier et le deuxième corps de base.
  4. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel la pièce (10) électrique conductrice est isolée thermiquement des contacts (5, 15) électriques en raison d'une séparation spatiale.
  5. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel les deux corps (1, 30) de base sont empilés l'un sur l'autre ;
    - dans lequel la pièce (10) électrique conductrice est disposée dans l'espace (35) intermédiaire entre les deux corps (1, 30) de base ;
    - dans lequel les contacts (5, 15) électriques contactent, respectivement, les côtés (1A, 30A) des corps (1, 30) de base qui sont éloignés de l'espace (35) intermédiaire.
  6. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel l'encapsulage (50) ménage ou ferme une cavité de réception de la matière (20) isolante.
  7. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel l'encapsulage (50) est résistant à la température.
  8. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel il est prévu un boîtier (45) qui entoure les corps de base (1 ou 1, 30), la pièce (10) électrique conductrice, la matière (20) isolante du point de vue électrique ayant l'encapsulage (50) et au moins en partie les contacts (5, 15) électriques.
  9. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel les corps (1 ou 1, 30) de base comprennent une céramique de varistance.
  10. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel les corps (1 ou 1, 30) de base comprennent une céramique de varistance à base de ZnO.
  11. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel la matière (20) isolante du point de vue électrique est du sable de quartz ou des billes de verre.
  12. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel la pièce (10) électrique conductrice est une brasure.
  13. Composant électrique suivant l'une des revendications précédentes,
    - dans lequel la pièce (10) électrique conductrice est une brasure ayant un point de fusion compris entre environ 80°C et 180°C.
EP02754320A 2001-08-02 2002-07-04 Composant electroceramique Expired - Lifetime EP1412953B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10137873A DE10137873C1 (de) 2001-08-02 2001-08-02 Elektrokeramisches Bauelement
DE10137873 2001-08-02
PCT/DE2002/002457 WO2003017292A2 (fr) 2001-08-02 2002-07-04 Composant electroceramique

Publications (2)

Publication Number Publication Date
EP1412953A2 EP1412953A2 (fr) 2004-04-28
EP1412953B1 true EP1412953B1 (fr) 2006-09-13

Family

ID=7694113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02754320A Expired - Lifetime EP1412953B1 (fr) 2001-08-02 2002-07-04 Composant electroceramique

Country Status (7)

Country Link
US (1) US7728709B2 (fr)
EP (1) EP1412953B1 (fr)
JP (1) JP2004538658A (fr)
AT (1) ATE339768T1 (fr)
DE (2) DE10137873C1 (fr)
TW (1) TW569244B (fr)
WO (1) WO2003017292A2 (fr)

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DE102005024346B4 (de) 2005-05-27 2012-04-26 Infineon Technologies Ag Sicherungselement mit Auslöseunterstützung
DE102005024321B8 (de) * 2005-05-27 2012-10-04 Infineon Technologies Ag Absicherungsschaltung
DE102005024347B8 (de) * 2005-05-27 2010-07-08 Infineon Technologies Ag Elektrisches Bauteil mit abgesichertem Stromzuführungsanschluss
AU2006277738A1 (en) * 2005-08-05 2007-02-15 Kiwa Spol. S R.O. Overvoltage protection with status signalling
FR2897231B1 (fr) * 2006-02-06 2009-02-20 Ming Tao Circuit de protection thermique pour un composant semiconducteur
US20070200657A1 (en) * 2006-02-28 2007-08-30 Shang-Chih Tsai Thermal fuse varistor assembly with an insulating glass passivation layer
CN101320605B (zh) * 2007-06-06 2011-05-11 兴勤电子工业股份有限公司 具有热保护功能的压敏电阻
SI23040B (en) * 2009-04-29 2018-06-29 Crdce D.O.O. A varistor with a defined weak point in the structure
US8836464B2 (en) * 2009-06-24 2014-09-16 Ceramate Technical Co., Ltd. Explosion-proof and flameproof ejection type safety surge-absorbing module
US20100328016A1 (en) * 2009-06-24 2010-12-30 Robert Wang Safe surge absorber module
DE102009053145A1 (de) * 2009-11-05 2011-05-12 Phoenix Contact Gmbh & Co. Kg Überspannungsschutzelement
FR2958787B1 (fr) * 2010-04-09 2012-05-11 Abb France Dispositif de protection contre les surtensions a deconnecteurs thermiques dedoubles
US9165702B2 (en) * 2011-03-07 2015-10-20 James P. Hagerty Thermally-protected varistor
US8461956B2 (en) * 2011-07-20 2013-06-11 Polytronics Technology Corp. Over-current protection device
JP5737252B2 (ja) * 2012-09-25 2015-06-17 株式会社村田製作所 回路装置とその製造方法
WO2020148015A1 (fr) * 2019-01-16 2020-07-23 Siemens Aktiengesellschaft Corps de sécurité et fusible
KR102265512B1 (ko) * 2019-09-23 2021-06-16 스마트전자 주식회사 회로 보호 장치

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Also Published As

Publication number Publication date
DE10137873C1 (de) 2002-10-17
EP1412953A2 (fr) 2004-04-28
DE50208156D1 (de) 2006-10-26
ATE339768T1 (de) 2006-10-15
WO2003017292A2 (fr) 2003-02-27
WO2003017292A3 (fr) 2003-12-11
JP2004538658A (ja) 2004-12-24
US7728709B2 (en) 2010-06-01
US20040264092A1 (en) 2004-12-30
TW569244B (en) 2004-01-01

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