EP1412953A2 - Electroceramic component - Google Patents
Electroceramic componentInfo
- 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
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.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10137873A DE10137873C1 (en) | 2001-08-02 | 2001-08-02 | Electroceramic component with fuse provided by conductor piece melted upon application of overvoltage |
DE10137873 | 2001-08-02 | ||
PCT/DE2002/002457 WO2003017292A2 (en) | 2001-08-02 | 2002-07-04 | Electroceramic component |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1412953A2 true EP1412953A2 (en) | 2004-04-28 |
EP1412953B1 EP1412953B1 (en) | 2006-09-13 |
Family
ID=7694113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02754320A Expired - Lifetime EP1412953B1 (en) | 2001-08-02 | 2002-07-04 | Electroceramic component |
Country Status (7)
Country | Link |
---|---|
US (1) | US7728709B2 (en) |
EP (1) | EP1412953B1 (en) |
JP (1) | JP2004538658A (en) |
AT (1) | ATE339768T1 (en) |
DE (2) | DE10137873C1 (en) |
TW (1) | TW569244B (en) |
WO (1) | WO2003017292A2 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005024347B8 (en) * | 2005-05-27 | 2010-07-08 | Infineon Technologies Ag | Electrical component with fused power supply connection |
DE102005024321B8 (en) * | 2005-05-27 | 2012-10-04 | Infineon Technologies Ag | protection circuit |
DE102005024346B4 (en) * | 2005-05-27 | 2012-04-26 | Infineon Technologies Ag | Fuse element with trigger support |
AU2006277738A1 (en) * | 2005-08-05 | 2007-02-15 | Kiwa Spol. S R.O. | Overvoltage protection with status signalling |
FR2897231B1 (en) * | 2006-02-06 | 2009-02-20 | Ming Tao | THERMAL PROTECTION CIRCUIT FOR A SEMICONDUCTOR COMPONENT |
US20070200657A1 (en) * | 2006-02-28 | 2007-08-30 | Shang-Chih Tsai | Thermal fuse varistor assembly with an insulating glass passivation layer |
CN101320605B (en) * | 2007-06-06 | 2011-05-11 | 兴勤电子工业股份有限公司 | Piezoresistor with heat protection function |
SI23040B (en) * | 2009-04-29 | 2018-06-29 | Crdce D.O.O. | Varistor with defined weak spot within its 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 (en) | 2009-11-05 | 2011-05-12 | Phoenix Contact Gmbh & Co. Kg | Overvoltage protection device, has thermal expandable material arranged within housing such that pole of varistor does not stay in electrically conductive contact with connection elements |
FR2958787B1 (en) * | 2010-04-09 | 2012-05-11 | Abb France | DEVICE FOR PROTECTION AGAINST OVERVOLTAGES WITH DEDUCTIVE THERMAL DISCONNECTORS |
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 (en) * | 2012-09-25 | 2015-06-17 | 株式会社村田製作所 | Circuit device and manufacturing method thereof |
CN113287184A (en) * | 2019-01-16 | 2021-08-20 | 西门子股份公司 | Fuse body and fuse |
KR102265512B1 (en) * | 2019-09-23 | 2021-06-16 | 스마트전자 주식회사 | Circuit protecting device |
Family Cites Families (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 (en) | 1981-10-05 | 1990-10-23 | Matsushita Electric Ind Co Ltd | SERAMITSUKUBARISUTA |
JPS5877201A (en) | 1981-11-02 | 1983-05-10 | 松下電器産業株式会社 | Ceramic varistor |
DE3318588A1 (en) * | 1983-05-21 | 1984-11-22 | Brown, Boveri & Cie Ag, 6800 Mannheim | VARISTOR LOCKING ELEMENT |
JPS60148337A (en) | 1984-01-06 | 1985-08-05 | 日本電気株式会社 | Composite protective element |
JPS61221526A (en) | 1985-03-25 | 1986-10-01 | 松下電器産業株式会社 | Surge absorbor |
JPS62157040A (en) | 1985-12-28 | 1987-07-13 | Konishiroku Photo Ind Co Ltd | Electrophotographic sensitive body |
EP0243602B1 (en) | 1986-04-23 | 1989-12-20 | Siemens Aktiengesellschaft | Electric component having a higher solidity versus temperature variations and current pulses, especially a varistor |
JPS6350101A (en) | 1986-08-19 | 1988-03-03 | Matsushita Electric Ind Co Ltd | Electric circuit |
DE3631177A1 (en) | 1986-09-12 | 1988-03-24 | Oels Wolf Dieter Dr Ing | Device for protection against overvoltages in electrical equipment |
DE3643622A1 (en) | 1986-09-23 | 1988-06-30 | Bettermann Obo Ohg | Protection device on varistors |
JPH0247842A (en) | 1988-08-10 | 1990-02-16 | Hitachi Ltd | Tension control method and device |
JPH0284016A (en) | 1988-09-16 | 1990-03-26 | Nec Corp | Surge absorber provided with protector |
JP2841521B2 (en) | 1989-08-14 | 1998-12-24 | 日本電気株式会社 | Varistor |
DE3927547A1 (en) | 1989-08-21 | 1991-02-28 | Dehn & Soehne | Varistor switching=off circuit - causes solder point to melt when high current flows to cut=off varistor power supply |
JPH0453106A (en) | 1990-06-18 | 1992-02-20 | Matsushita Electric Ind Co Ltd | Surge absorber with safety function |
JPH04151804A (en) * | 1990-10-15 | 1992-05-25 | Nec Corp | Fuse containing varistor |
JPH07182964A (en) | 1993-12-22 | 1995-07-21 | San'eisha Mfg Co Ltd | Cable fuse |
JP3877340B2 (en) * | 1994-08-29 | 2007-02-07 | ローム株式会社 | Packaged solid electrolytic capacitor with safety fuse |
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 (en) | 1997-04-25 | 2000-06-08 | Epcos Ag | Electrical component with safety disconnect device |
US6094128A (en) * | 1998-08-11 | 2000-07-25 | Maida Development Company | Overload protected solid state varistors |
JP2000286106A (en) | 1999-03-30 | 2000-10-13 | Ricoh Co Ltd | Varistor device |
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 |
EP1150307B1 (en) | 2000-04-26 | 2008-10-22 | Littelfuse Ireland Development Company Limited | A thermally protected metal oxide varistor |
-
2001
- 2001-08-02 DE DE10137873A patent/DE10137873C1/en not_active Expired - Fee Related
-
2002
- 2002-07-03 TW TW091114742A patent/TW569244B/en active
- 2002-07-04 US US10/485,166 patent/US7728709B2/en not_active Expired - Fee Related
- 2002-07-04 JP JP2003522110A patent/JP2004538658A/en active Pending
- 2002-07-04 DE DE50208156T patent/DE50208156D1/en not_active Expired - Lifetime
- 2002-07-04 EP EP02754320A patent/EP1412953B1/en not_active Expired - Lifetime
- 2002-07-04 AT AT02754320T patent/ATE339768T1/en not_active IP Right Cessation
- 2002-07-04 WO PCT/DE2002/002457 patent/WO2003017292A2/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO03017292A2 * |
Also Published As
Publication number | Publication date |
---|---|
TW569244B (en) | 2004-01-01 |
US7728709B2 (en) | 2010-06-01 |
DE50208156D1 (en) | 2006-10-26 |
WO2003017292A3 (en) | 2003-12-11 |
DE10137873C1 (en) | 2002-10-17 |
ATE339768T1 (en) | 2006-10-15 |
JP2004538658A (en) | 2004-12-24 |
EP1412953B1 (en) | 2006-09-13 |
US20040264092A1 (en) | 2004-12-30 |
WO2003017292A2 (en) | 2003-02-27 |
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