EP1412953A2 - Composant electroceramique - Google Patents

Composant electroceramique

Info

Publication number
EP1412953A2
EP1412953A2 EP02754320A EP02754320A EP1412953A2 EP 1412953 A2 EP1412953 A2 EP 1412953A2 EP 02754320 A EP02754320 A EP 02754320A EP 02754320 A EP02754320 A EP 02754320A EP 1412953 A2 EP1412953 A2 EP 1412953A2
Authority
EP
European Patent Office
Prior art keywords
electrical
base body
component according
conductor piece
electrical component
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
EP02754320A
Other languages
German (de)
English (en)
Other versions
EP1412953B1 (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
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
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

Links

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 electro-ceramic component with a temperature fuse.
  • Such components include, for example, varistors.
  • the basic body of such known components is often made from a mixture of different metal oxides, for example based on zinc oxide.
  • Varistors have a non-linear voltage-dependent change in resistance that is used to protect an electrical circuit from overvoltage. The resistance value of varistors decreases with increasing voltage.
  • a varistor fuse element for protecting electrical circuits against overvoltages and overtemperature is known from the publication DE 331 85 88. It consists of a mechanical construction in which a low-melting solder is applied to the varistor, which fixes a resilient power supply line. If overvoltages occur and the varistor overheats, the solder melts, the spring construction then producing an irreversible, low-resistance short-circuit bridging with a second power supply. The spring construction also increases the distance between the resilient power supply and the variator in order to prevent an electrical flashover.
  • the disadvantages of this mechanical construction are that it is very difficult to implement.
  • 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 this can be triggered.
  • the disadvantage of this construction is that the temperature fuse is not in direct thermal contact with the varistor and is therefore only triggered at higher temperatures due to losses during heat transfer.
  • the object of the invention is therefore to provide a simple thermal fuse for electro-ceramic components which avoids the disadvantages mentioned.
  • the invention describes an electro-ceramic component with at least a first ceramic base body.
  • a current flows between two electrical contacts via the first ceramic base body and an electrical conductor piece.
  • the first ceramic base body contacts • the electrical conductor piece and is therefore in direct thermal contact with it. If the operating voltage is exceeded, the first ceramic base body heats up considerably as a result of the increasing power loss, so that the electrical conductor piece is also heated. It is designed so that it from a certain temperature melts and thus interrupts the flow of electricity.
  • An electrically insulating material prevents an electrical flashover between the electrically conductive areas that have been contacted by the electrical conductor piece and thus ensures a reliable interruption of the current path.
  • the first base body can 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 approximately 80 ° C. and 180 ° C. Free-flowing or free-flowing materials such as quartz sand or glass balls can be used as the electrically insulating material.
  • the entire electro-ceramic component with the integrated temperature fuse and the encapsulation can advantageously be encased in a single housing. This creates a compact component with a reduced space requirement.
  • FIGS. 1A and 1B show a varistor according to the invention with an integrated temperature fuse with two ceramic base bodies in top view and in cross section.
  • FIGS. 2A and 2B show a varistor according to the invention with only one ceramic base body in top view and in cross section.
  • 1A and 1B is a series connection of two
  • Varistor base bodies 1 and 30 each with an operating voltage of approximately 60 or 75 V, so that an operating voltage of approximately 130 V in total can be realized.
  • the two varistor base bodies 1 and 30 are a low-melting solder with a through the electrical see piece 10
  • the electrically insulating material 20 can advantageously be embodied as quartz sand, which is arranged between the two varistor base bodies and surrounds the solder 10. Tinned copper wires, for example, can serve as electrical contacts 5 and 15.
  • a plastic ring 50 advantageously made of a temperature-resistant dig plastic such as polyphenylene sulfide (PPS) creates together with the two ceramic base 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 component with integrated temperature fuse can advantageously be surrounded by a housing 45, which is made of epoxy plastic, for example.
  • the electrical conductor piece 10 of the component reliably melts within a few seconds.
  • the temperature on the housing of the component is only about 120 ° C. This ensures that the component does not start to burn and no objects in its environment
  • varistor materials 1 and 30 for example based on SiC.
  • the embodiment with the two ceramic base bodies also has the advantage that a spatial separation of the electrical contacts 5 and 15 from the electrical conductor piece 10 is possible.
  • the electrical conductor piece is located in the intermediate space 35 between the two varistor base bodies, while the electrical contacts each contact the sides 1A, 30A of the varistor base body facing away from the intermediate space. This ensures good thermal shielding of the electrical conductor piece from the electrical contacts, so that there is a high resistance to soldering heat. This is contrary to many conventional ones Thermal fuses allow the electrical contacts to be soldered or welded on without a problem, 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 main body 1.
  • the electrical conductor piece 10 is connected directly to the second electrical contact 15 and the varistor main body 1.
  • a ring 50 which is advantageously designed as a plastic, creates a cavity for receiving the electrically insulating material 20, which in this embodiment is intended to prevent an electrical flashover between the varistor base body 1 and the second electrical contact 15.
  • the entire arrangement can be provided with a cover 50B which closes the component.
  • the varistor base body 1 is contacted by the first electrical contact 5.
  • This alternative embodiment shows similar properties in the event of overheating and similar current discharge capacity as the embodiment with two ceramic base bodies.

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)
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 true EP1412953A2 (fr) 2004-04-28
EP1412953B1 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)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
EP1911046A1 (fr) * 2005-08-05 2008-04-16 KIWA spol.s r.o. Protection face aux surtensions a signalisation de statut
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
US20100328016A1 (en) * 2009-06-24 2010-12-30 Robert Wang Safe surge absorber module
US8836464B2 (en) * 2009-06-24 2014-09-16 Ceramate Technical Co., Ltd. Explosion-proof and flameproof ejection type safety surge-absorbing 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
CN113287184A (zh) * 2019-01-16 2021-08-20 西门子股份公司 熔断器本体和熔断器
KR102265512B1 (ko) * 2019-09-23 2021-06-16 스마트전자 주식회사 회로 보호 장치

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US4174529A (en) 1978-04-10 1979-11-13 General Electric Company Protective circuit for zinc oxide varistors
JPS5512405A (en) 1978-07-12 1980-01-29 Hitachi Ltd Liquid level detector
US4388603A (en) * 1981-05-15 1983-06-14 Mcgraw-Edison Company Current limiting fuse
JPH0247842B2 (ja) 1981-10-05 1990-10-23 Matsushita Electric Ind Co Ltd Seramitsukubarisuta
JPS5877201A (ja) 1981-11-02 1983-05-10 松下電器産業株式会社 セラミツクバリスタ
DE3318588A1 (de) 1983-05-21 1984-11-22 Brown, Boveri & Cie Ag, 6800 Mannheim Varistorsicherungselement
JPS60148337A (ja) 1984-01-06 1985-08-05 日本電気株式会社 複合形保護素子
JPS61221526A (ja) 1985-03-25 1986-10-01 松下電器産業株式会社 サ−ジ吸収器
JPS62157040A (ja) 1985-12-28 1987-07-13 Konishiroku Photo Ind Co Ltd 電子写真感光体
DE3761236D1 (de) 1986-04-23 1990-01-25 Siemens Ag Elektrisches bauelement mit hoher festigkeit bei beanspruchung durch temperaturwechsel und durch stossstroeme, insbesondere ein varistor.
JPS6350101A (ja) 1986-08-19 1988-03-03 Matsushita Electric Ind Co Ltd 電気回路
DE3631177A1 (de) 1986-09-12 1988-03-24 Oels Wolf Dieter Dr Ing Vorrichtung zum schutz gegen ueberspannungen bei elektrogeraeten
DE3643622A1 (de) 1986-09-23 1988-06-30 Bettermann Obo Ohg Schutzvorrichtung an varistoren
JPH0247842A (ja) 1988-08-10 1990-02-16 Hitachi Ltd 張力制御方法および装置
JPH0284016A (ja) 1988-09-16 1990-03-26 Nec Corp 保護回路付きサージ吸収回路
JP2841521B2 (ja) 1989-08-14 1998-12-24 日本電気株式会社 バリスタ
DE3927547A1 (de) 1989-08-21 1991-02-28 Dehn & Soehne Anordnung zur abschaltung eines varistors
JPH0453106A (ja) 1990-06-18 1992-02-20 Matsushita Electric Ind Co Ltd 安全保障機能付サージ吸収器
JPH04151804A (ja) * 1990-10-15 1992-05-25 Nec Corp ヒューズ内蔵型バリスタ
JPH07182964A (ja) 1993-12-22 1995-07-21 San'eisha Mfg Co Ltd 電線ヒューズ
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US5675468A (en) * 1994-11-08 1997-10-07 Chang; Pak Chuen Apparatus and method for protecting equipment against electrical power surges
US5713705A (en) 1996-03-01 1998-02-03 Gruenbichler; Carl Fastener bolt with limited torque head
US5708553A (en) * 1996-07-18 1998-01-13 Hung; Je Automatic switching-off structure for protecting electronic device from burning
US5982597A (en) * 1997-03-06 1999-11-09 Webb; Rommie Fred Shorting fusable metal oxide varistor
US5781394A (en) 1997-03-10 1998-07-14 Fiskars Inc. Surge suppressing device
DE19717634C2 (de) 1997-04-25 2000-06-08 Epcos Ag Elektrisches Bauelement mit Sicherheitstrennvorrichtung
US6094128A (en) * 1998-08-11 2000-07-25 Maida Development Company Overload protected solid state varistors
JP2000286106A (ja) * 1999-03-30 2000-10-13 Ricoh Co Ltd バリスタ装置
US6252488B1 (en) * 1999-09-01 2001-06-26 Leviton Manufacturing Co., Inc. Metal oxide varistors having thermal protection
US6510032B1 (en) * 2000-03-24 2003-01-21 Littelfuse, Inc. Integrated overcurrent and overvoltage apparatus for use in the protection of telecommunication circuits
DE60136243D1 (de) * 2000-04-26 2008-12-04 Littlefuse Ireland Dev Company Thermisch geschützter Varistor auf Basis eines Metalloxids

Non-Patent Citations (1)

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Title
See references of WO03017292A2 *

Also Published As

Publication number Publication date
TW569244B (en) 2004-01-01
US7728709B2 (en) 2010-06-01
DE10137873C1 (de) 2002-10-17
WO2003017292A3 (fr) 2003-12-11
EP1412953B1 (fr) 2006-09-13
US20040264092A1 (en) 2004-12-30
JP2004538658A (ja) 2004-12-24
ATE339768T1 (de) 2006-10-15
WO2003017292A2 (fr) 2003-02-27
DE50208156D1 (de) 2006-10-26

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