CN101303926B - Voltage dependent resistor - Google Patents
Voltage dependent resistor Download PDFInfo
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- CN101303926B CN101303926B CN2008101226870A CN200810122687A CN101303926B CN 101303926 B CN101303926 B CN 101303926B CN 2008101226870 A CN2008101226870 A CN 2008101226870A CN 200810122687 A CN200810122687 A CN 200810122687A CN 101303926 B CN101303926 B CN 101303926B
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- fuse
- piezo
- resistance
- piezoresistive element
- varistor
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Abstract
The invention relates to a fast-response thermal protection varistor, comprising a shell in which a fuse and a varistor are arranged. An insulating layer is arranged between the fuse and the varistor. The insulating layer is connected with the varistor by a metal conductor through high temperature metal. The fast-response thermal protection varistor ensures that the low temperature alloy fuse cansense the heat of the varistor directly and quickly. Furthermore, the fast-response thermal protection varistor has large collector area, short heat transfer path and high heating efficiency and effectively prevents the aging of the varistor.
Description
Technical field
The present invention relates to a kind of Zinc-oxide piezoresistor, particularly relate to the hot protection type piezo-resistance of a kind of quick response.
Background technology
In existing technology, United States Patent (USP) 6636403 provides a kind of varistor that has heat protection function, and fuse one end directly is welded on the chip, and the fuse other end links to each other with metal wire, draws as the varistor pin.The potsherd of packing between metal wire and chip varistor insulation is isolated.The fuse top is pressed with organic substance, and working mechanism is: when the increase of chip varistor temperature, heat conducts to fuse top organic substance, and the organic substance expanded by heating breaks fusion fuse.These patent existing problems: heat is passed to fuse top organic substance conducting pathway path length, and transmission speed is slow, and opening time is long.Because organic substance expands, can cause the epoxy cracking in addition, components and parts around the piezo-resistance are constituted prestige association.Chinese patent 10044661.5 provides several piezo-resistances that are provided with alloy-type temperature fuse.Low-temperature alloy fuse in the alloy-type temperature fuse props up pin from surrounding environment perception heat by one, and action disconnects then.These patent existing problems: the alloy fuse in the Thermal Cutoffs does not have fully closely to accept the heat that chip varistor spreads out of, and caloric requirement is by long lead, and the not good epoxy resin that perhaps conducts heat passes to the alloy fuse in the Thermal Cutoffs.Heat transfer rate is slow, and operate time is long, and the heat efficiency is low.
Summary of the invention
The objective of the invention is shortcoming, a kind of quick response is provided, the hot protection type piezo-resistance that action sensitivity is high at prior art.
The technical solution adopted for the present invention to solve the technical problems is: a kind of piezo-resistance, comprise shell, be provided with fuse and piezoresistive element in this shell, be provided with insulating barrier between described fuse and the piezoresistive element, described insulating barrier adopts high-temperature metal to be connected with piezoresistive element by metallic conductor.
According to another embodiment of the invention, piezo-resistance comprises that further described fuse encapsulates by fluxing resin.
According to another embodiment of the invention, piezo-resistance further comprise described fuse and piezoresistive element by epoxy encapsulation in shell.
According to another embodiment of the invention, piezo-resistance comprises that further described fuse is the low-temperature alloy fuse.
According to another embodiment of the invention, piezo-resistance comprises that further described shell is the flame retardant plastics shell.
According to another embodiment of the invention, piezo-resistance comprises that further described insulating barrier offers through hole, and described fuse is connected by metal pins with described metallic conductor, and this metal pins passes through hole.
According to another embodiment of the invention, piezo-resistance comprises that further fuse places on piezoresistive element pyrotoxin shortest path.
According to another embodiment of the invention, piezo-resistance comprises that further described insulating barrier is insulating ceramics base and insulating ceramics lid, and fuse places among insulating ceramics base and the insulating ceramics lid.
According to another embodiment of the invention, piezo-resistance comprises that insulating barrier directly is connected with piezoresistive element by metallic conductor, and fuse directly is connected with piezoresistive element by through hole.
The invention has the beneficial effects as follows that the fuse that uses in the heat protection piezo-resistance of the present invention is the temperature module, the origin of heat of fuse action is in the heat that chip varistor produced.Adopt high temperature alloy to connect together between the insulating ceramics base of temperature protection device and the voltage dependent resistor chip by metallic conductor; the low-temperature alloy fuse lies low; closely contact is in the middle of insulator foot; make that the low-temperature alloy fuse can be direct; experience the heat of piezo-resistance accurately, and collector area is big rapidly; heat efficiency height effectively prevents the aging of heat protection piezo-resistance.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is the partial sectional view of the preferred embodiments of the present invention.
Fig. 2 be A-A to sectional view.
Wherein: 1, shell, 3, fuse, 5, piezoresistive element, 7, insulating barrier, 9, metallic conductor, 11, through hole, 13, metal pins, 15, the insulating ceramics base, 17, the insulating ceramics lid, 19, first pin, 21, second pin, the 23, the 3rd pin, 25, fluxing resin.
Embodiment
The present invention is further detailed explanation with preferred embodiment in conjunction with the accompanying drawings now.These accompanying drawings are the schematic diagram of simplification, basic structure of the present invention only is described in a schematic way, so it only show the formation relevant with the present invention.
A kind of pressure-sensitive resistance shown in Fig. 1-2, comprise shell 1, be provided with fuse 3 and piezoresistive element 5 in this shell 1, be provided with insulating barrier 7 between this fuse 3 and the piezoresistive element 5, this insulating barrier 7 adopts high-temperature metal to be connected with piezoresistive element 5 by metallic conductor 9.And, piezoresistive element 5 two ends are connected with first pin 19 and second pin 21, second pin 21 is connected with piezoresistive element 5 by metallic conductor 9, insulating barrier 7 offers through hole 11, described fuse 3 one ends are connected by metal pins 13 with described metallic conductor 9, and this metal pins 13 passes through hole 11.The other end of fuse 3 is connected with the 3rd pin 23, and wherein, this fuse 3 adopts the low-temperature alloy fuse.Insulating barrier 7 is insulating ceramics base 15 and insulating ceramics lid 17 in the preferred enforcement of the present invention, fuse 3 places among insulating ceramics base 15 and the insulating ceramics lid 17, and adopts fluxing resin 25 that fuse 3 is packaged in insulating ceramics base 15 and insulating ceramics lid 17.By epoxy resin piezoresistive element 5 and fuse 3 are packaged in the shell 1 at last.
When piezoresistive element 5 causes adstante febre because of various factors, heat can conduct to the fuse 3 that is positioned at insulating barrier 7 sides by metallic conductor 9 rapidly, fuse 3 shrinks to the 3rd pin 23 and metal pins 13 places under the acting in conjunction of heat and fluxing resin, thereby cut-out circuit, the piezoresistive element 5 that is about to worsen is separated from from circuit, in addition, also can connects signal lamp at the two ends of fuse 3, after fuse 3 disconnects, with the overtemperature signal demonstration of piezoresistive element 5.
With above-mentioned foundation desirable embodiment of the present invention is enlightenment, and by above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.The technical scope of this invention is not limited to the content on the specification, must determine its technical scope according to the claim scope.
Claims (8)
1. piezo-resistance, comprise shell (1), be provided with fuse (3) and piezoresistive element (5) in this shell (1), it is characterized in that: be provided with insulating barrier (7) between described fuse (3) and the piezoresistive element (5), described insulating barrier (7) adopts high-temperature metal to be connected with piezoresistive element (5) by metallic conductor (9), described insulating barrier (7) offers through hole (11), described fuse (3) is connected by metal pins (13) with described metallic conductor (9), and this metal pins (13) passes through hole (11).
2. piezo-resistance as claimed in claim 1 is characterized in that: described fuse (3) encapsulates by fluxing resin.
3. piezo-resistance as claimed in claim 1 is characterized in that: described fuse (3) and piezoresistive element (5) by epoxy encapsulation in shell (1).
4. piezo-resistance as claimed in claim 1 is characterized in that: described fuse (3) is the low-temperature alloy fuse.
5. piezo-resistance as claimed in claim 1 is characterized in that: described shell (1) is the flame retardant plastics shell.
6. piezo-resistance as claimed in claim 1 is characterized in that: fuse (3) places on piezoresistive element (5) pyrotoxin shortest path.
7. piezo-resistance as claimed in claim 2 is characterized in that: described insulating barrier (7) places among insulating ceramics base (15) and the insulating ceramics lid (17) for insulating ceramics base (15) and insulating ceramics lid (17), fuse (3).
8. piezo-resistance as claimed in claim 1 is characterized in that: described insulating barrier (7) directly is connected with piezoresistive element (5) by metallic conductor (9), and fuse (3) directly is connected with piezoresistive element (5) by through hole (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101226870A CN101303926B (en) | 2008-06-19 | 2008-06-19 | Voltage dependent resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101226870A CN101303926B (en) | 2008-06-19 | 2008-06-19 | Voltage dependent resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101303926A CN101303926A (en) | 2008-11-12 |
| CN101303926B true CN101303926B (en) | 2010-10-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101226870A Active CN101303926B (en) | 2008-06-19 | 2008-06-19 | Voltage dependent resistor |
Country Status (1)
| Country | Link |
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| CN (1) | CN101303926B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102881389B (en) * | 2012-09-28 | 2015-07-08 | 广东风华高新科技股份有限公司 | Piezoresistor and preparation method thereof |
| WO2015188752A1 (en) * | 2014-06-10 | 2015-12-17 | 厦门赛尔特电子有限公司 | Novel thermal-protection metal-oxide varistor and surge protector |
| CN104517694A (en) * | 2014-12-17 | 2015-04-15 | 兴勤（常州）电子有限公司 | Thermally-protected pressure-sensitive resistor and production process thereof |
| CN107946011B (en) * | 2017-10-12 | 2020-03-31 | 爱普科斯电子元器件(珠海保税区)有限公司 | Embedded voltage dependent resistor with thermal protection function |
| CN113192713B (en) * | 2021-04-27 | 2023-05-23 | 广西新未来信息产业股份有限公司 | Thermal protection piezoresistor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6636403B2 (en) * | 2000-04-26 | 2003-10-21 | Littlefuse Ireland Development Company Limited | Thermally protected metal oxide varistor |
| CN1953109A (en) * | 2005-10-21 | 2007-04-25 | 徐忠厚 | Varistor with alloy-type temperature fuse |
| CN201247660Y (en) * | 2008-06-19 | 2009-05-27 | 兴勤（常州）电子有限公司 | Heat protection type piezoresistor |
-
2008
- 2008-06-19 CN CN2008101226870A patent/CN101303926B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6636403B2 (en) * | 2000-04-26 | 2003-10-21 | Littlefuse Ireland Development Company Limited | Thermally protected metal oxide varistor |
| CN1953109A (en) * | 2005-10-21 | 2007-04-25 | 徐忠厚 | Varistor with alloy-type temperature fuse |
| CN201247660Y (en) * | 2008-06-19 | 2009-05-27 | 兴勤（常州）电子有限公司 | Heat protection type piezoresistor |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平9-129403A 1997.05.16 |
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| Publication number | Publication date |
|---|---|
| CN101303926A (en) | 2008-11-12 |
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