CN102403704A - Overcurrent overvoltage protection device - Google Patents
Overcurrent overvoltage protection device Download PDFInfo
- Publication number
- CN102403704A CN102403704A CN2011103616187A CN201110361618A CN102403704A CN 102403704 A CN102403704 A CN 102403704A CN 2011103616187 A CN2011103616187 A CN 2011103616187A CN 201110361618 A CN201110361618 A CN 201110361618A CN 102403704 A CN102403704 A CN 102403704A
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- China
- Prior art keywords
- resettable fuse
- oxide piezoresistor
- zinc oxide
- zinc
- lead wire
- 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.)
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Abstract
The invention relates to an overcurrent overvoltage protection device, which comprises a resettable fuse, a zinc oxide piezoresistor and an encapsulation coating; one end of the resettable fuse is connected with one end of the zinc oxide piezoresistor through a conductive layer, while the other end of the resettable fuse is connected with a lead wire; the other end of the zinc oxide piezoresistor is connected with a lead wire, and one end of the resettable fuse connected with the zinc oxide piezoresistor is connected with a lead wire; and the encapsulation coating is coated out of the resettable fuse and the zinc oxide piezoresistor, and only the lead wire is exposed. The technical scheme has the effects that: the reliability of the zinc oxide piezoresistor is improved, and the voltage sensitive failure caused by longtime overvoltage is avoided; the protection speed of the resettable fuse is accelerated; and the defect on too slow protection and even non protection of the resettable fuse on the conventional overcurrent overvoltage protection device in low temperature environment is solved.
Description
Technical field
The present technique scheme relates to technical field of electronic components, specifically is a kind of over-current overvoltage protector spare.
Background technology
Zinc-oxide piezoresistor has nonlinear voltage-current characteristic; Generally be used for electronic circuit and do anti-overvoltage, anti-thunderbolt protector spare; Its operation principle is that varistor is connected on the protected circuit, and when line voltage distribution was lower than the operational voltage value of piezo-resistance, the varistor resistance was high; Be close to open circuit, thereby can not influence the operate as normal of device or electric equipment.When voltage instantaneous was higher than a certain numerical value, the varistor resistance descended rapidly, the big electric current of conducting, thereby with voltage clamp protection protected device or electric equipment in the voltage range that protected device or electric equipment can bear.Zinc-oxide piezoresistor absorbs energy when conducting, self temperature raises rapidly, so absorbent energy is limited during the piezo-resistance conducting, causes the piezo-resistance temperature too high and thermal breakdown was lost efficacy if energy is crossed senior general.
In the prior art, recover the danger silk certainly by forming through the polymer resin (Polymer) of special processing and the conducting particles (Carbon Black) that is distributed in the inside.Polymer resin closely is strapped in conducting particles outside the crystalloid structure under normal operation; Constitute chain conduction electric pathway; The resettable fuse of this moment is a low resistive state, and the heat energy that electric current produced of the self-healing fuse of flowing through on the circuit is little, can not change crystal structure.When circuit was short-circuited or transship, the heat that the big electric current of the self-healing fuse of flowing through produces melted polymer resin, and volume increases rapidly, forms high-impedance state, and operating current reduces rapidly, thereby circuit is limited and protects.After fault was got rid of, self-healing fuse is crystallisation by cooling again, volume contraction, and conducting particles forms conductive path again, and self-healing fuse reverts to low resistive state, thereby accomplishes the protection to circuit, need not artificially change.
The present technique scheme fits tightly and is packaged into one with piezo-resistance and resettable fuse, makes this device integrate over-voltage protecting function and overcurrent, overload protection function.Simultaneously because when overpressure conditions occurring; Piezo-resistance conducting and heating; Heat passes to resettable fuse rapidly; The Yin Wendu of resettable fuse raises with the electric current increase and resistance increases rapidly, protects piezo-resistance to avoid the too high and thermal breakdown of Yin Wendu conversely, has improved the reliability of Zinc-oxide piezoresistor greatly.Concern with the resettable fuse thermal coupling because of pressure-sensitive simultaneously, accelerated the protection speed of resettable fuse and solved resettable fuse under the low temperature environment temperature, to protect the slow not even defective of protection.
The effect of present technique scheme is following:
1, improves the reliability of Zinc-oxide piezoresistor, avoid causing pressure-sensitive inefficacy because of long-time overvoltage.
2, accelerate the protection speed of resettable fuse.
3, solve resettable fuse and under low temperature environment, protected the slow not even defective of protection.
Summary of the invention
In order to solve the problems referred to above that exist in the prior art, the present technique scheme proposes a kind of overcurrent-overvoltage protecting circuit and device, and concrete technical scheme is following:
A kind of over-current overvoltage protector spare; Comprise resettable fuse, Zinc-oxide piezoresistor and seal coating; One end of said resettable fuse and an end of Zinc-oxide piezoresistor are connected through conductive layer; The other end of resettable fuse is connected with lead-in wire, and the other end of Zinc-oxide piezoresistor is connected with lead-in wire, and an end that is connected with Zinc-oxide piezoresistor of said resettable fuse is connected with lead-in wire; The said coating of sealing is coated in outside resettable fuse and the Zinc-oxide piezoresistor, only exposes lead-in wire.
The principle of present technique scheme is following:
Description of drawings
Fig. 1 is an over-current overvoltage protector spare sketch map;
Among the figure, resettable fuse 1, Zinc-oxide piezoresistor 2, seal coating 3, conductive layer 4, scolding tin 5, lead-in wire 6.
Concrete technical scheme
Below in conjunction with accompanying drawing and embodiment the present technique scheme is further specified as follows:
A kind of over-current overvoltage protector spare; Comprise resettable fuse, Zinc-oxide piezoresistor and seal coating; One end of said resettable fuse and an end of Zinc-oxide piezoresistor are connected through conductive layer; The other end of resettable fuse is connected with lead-in wire, and the other end of Zinc-oxide piezoresistor is connected with lead-in wire, and an end that is connected with Zinc-oxide piezoresistor of said resettable fuse is connected with lead-in wire; The said coating of sealing is coated in outside resettable fuse and the Zinc-oxide piezoresistor, only exposes lead-in wire.
Claims (1)
1. over-current overvoltage protector spare; It is characterized in that comprising resettable fuse, Zinc-oxide piezoresistor and seal coating; One end of said resettable fuse and an end of Zinc-oxide piezoresistor are connected through conductive layer; The other end of resettable fuse is connected with lead-in wire, and the other end of Zinc-oxide piezoresistor is connected with lead-in wire, and an end that is connected with Zinc-oxide piezoresistor of said resettable fuse is connected with lead-in wire; The said coating of sealing is coated in outside resettable fuse and the Zinc-oxide piezoresistor, only exposes lead-in wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103616187A CN102403704A (en) | 2011-11-16 | 2011-11-16 | Overcurrent overvoltage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103616187A CN102403704A (en) | 2011-11-16 | 2011-11-16 | Overcurrent overvoltage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102403704A true CN102403704A (en) | 2012-04-04 |
Family
ID=45885623
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103616187A Pending CN102403704A (en) | 2011-11-16 | 2011-11-16 | Overcurrent overvoltage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102403704A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247582A (en) * | 2013-05-10 | 2013-08-14 | 昆山东日半导体有限公司 | Semiconductor surge suppressor lead package structure |
| CN104143822A (en) * | 2014-08-19 | 2014-11-12 | 四川三普科技有限公司 | Electromagnetic pulse protecting device |
| WO2017024577A1 (en) * | 2015-08-13 | 2017-02-16 | Littelfuse Semiconductor (Wuxi) Co., Ltd. | Overvoltage protection device |
| CN110491610A (en) * | 2018-05-15 | 2019-11-22 | 富致科技股份有限公司 | Combined type electric line protection device |
| CN111181125A (en) * | 2020-01-14 | 2020-05-19 | 深圳市嘉昱机电有限公司 | Overload protection device and electrical equipment |
-
2011
- 2011-11-16 CN CN2011103616187A patent/CN102403704A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103247582A (en) * | 2013-05-10 | 2013-08-14 | 昆山东日半导体有限公司 | Semiconductor surge suppressor lead package structure |
| CN103247582B (en) * | 2013-05-10 | 2015-07-01 | 昆山东日半导体有限公司 | Semiconductor surge suppressor lead package structure |
| CN104143822A (en) * | 2014-08-19 | 2014-11-12 | 四川三普科技有限公司 | Electromagnetic pulse protecting device |
| CN104143822B (en) * | 2014-08-19 | 2017-05-31 | 四川三普科技有限公司 | Spark gap device |
| WO2017024577A1 (en) * | 2015-08-13 | 2017-02-16 | Littelfuse Semiconductor (Wuxi) Co., Ltd. | Overvoltage protection device |
| US10714240B2 (en) | 2015-08-13 | 2020-07-14 | Littlefuse Semiconductor (Wuxi) Co., Ltd. | Overvoltage protection device |
| US10714241B2 (en) | 2015-08-13 | 2020-07-14 | Littelfuse Semiconductor (Wuxi) Co., Ltd. | Overvoltage protection device |
| CN110491610A (en) * | 2018-05-15 | 2019-11-22 | 富致科技股份有限公司 | Combined type electric line protection device |
| CN110491610B (en) * | 2018-05-15 | 2021-06-18 | 富致科技股份有限公司 | Composite circuit protection device |
| CN111181125A (en) * | 2020-01-14 | 2020-05-19 | 深圳市嘉昱机电有限公司 | Overload protection device and electrical equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120404 |