CN102403706A - Resettable fuse type self-protective overvoltage/overcurrent protection device - Google Patents
Resettable fuse type self-protective overvoltage/overcurrent protection device Download PDFInfo
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- CN102403706A CN102403706A CN2011103636250A CN201110363625A CN102403706A CN 102403706 A CN102403706 A CN 102403706A CN 2011103636250 A CN2011103636250 A CN 2011103636250A CN 201110363625 A CN201110363625 A CN 201110363625A CN 102403706 A CN102403706 A CN 102403706A
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- resettable fuse
- piezoresistor
- resistance
- piezo
- lead
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Abstract
A resettable fuse type self-protective overvoltage/overcurrent protection device comprises a piezoresistor, a ceramic PTC (Positive Temperature Coefficient) thermistor, a resettable fuse and a sealing coating, wherein the two ends of the piezoresistor are connected to one end of the ceramic PTC thermistor and one end of the resettable fuse through conducting layers, respectively; the end of the ceramic PTC thermistor which is not connected with the piezoresistor is connected to a lead; the end of the resettable fuse which is not connected with the piezoresistor is connected to a lead; the end of the piezoresistor which is connected with the resettable fuse is connected to a lead; and the sealing coating is applied to the surfaces of the piezoresistor, the ceramic PTC thermistor and the resettable fuse with only the leads exposed. The technical proposal improves the reliability of the zinc oxide piezoresistor and avoids voltage-sensitive effectiveness loss due to long-term overvoltage; besides, the resettable fuse type self-protective overvoltage/overcurrent protection device solves the problem of the voltage-sensitive effectiveness loss of the conventional overvoltage/overcurrent protection device due to too slow protection of the resettable fuse, and overcomes the shortcomings of two slow protection and even no protection of the resettable fuse in low-temperature environments.
Description
Technical field
The present technique scheme belongs to technical field of electronic devices, specifically is a kind of self-shield type over-voltage and over-current 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.
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 self-shield type over-voltage over-current protection circuit and device, and concrete technical scheme is following:
A kind of resettable fuse type self-shield type over-voltage and over-current protector spare comprises piezo-resistance, ceramic PTC thermistor, resettable fuse and seals coating; Said piezo-resistance two ends connect an end of ceramic PTC thermistor and an end of resettable fuse through conductive layer respectively; An end that is not connected with piezo-resistance of said ceramic PTC thermistor is connected with lead-in wire; An end that is not connected with piezo-resistance of said resettable fuse is connected with lead-in wire; An end that is connected with resettable fuse of said piezo-resistance is connected with lead-in wire; The said coating of sealing is coated in piezo-resistance, ceramic PTC thermistor and resettable fuse surface, only exposes lead-in wire.
The principle of present technique scheme is following:
Pottery PTC thermistor has nonlinear resistivity-temperature characteristics, and its resistance raises with the rising of temperature, has high withstand voltagely, and the ageing, and anti performance is the excellent components and parts of overtemperature protection.
Resettable fuse is 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.
This technical scheme will fit tightly and be packaged into one, make this device when overpressure conditions appears in circuit, be able to react fast and protect.Its operation principle is: pressure sensitive voltage conducting when line voltage distribution surpasses the conducting voltage of piezo-resistance; Temperature raises rapidly and passes to ceramic PTC thermistor 2; Pottery PTC thermistor 2 protects piezo-resistance to avoid because of long-time overvoltage thermal breakdown because of temperature rising resistance increases rapidly; Meanwhile resettable fuse 3 also raises because of temperature and the self-heating temperature that ceramic PTC thermistor 2 and piezo-resistance are transmitted; Its resistance increases rapidly and protects by protective circuit, reaches the effect of overvoltage protection.The PTC thermistor reaches the effect of overcurrent protection because of the characteristic that himself has overcurrent protection when overcurrent condition appears in circuit.
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, solve conventional over-voltage and over-current protector spare and protected the situation that causes pressure-sensitive inefficacy slowly because of resettable fuse.
3, solve resettable fuse and under low temperature environment, protected the slow not even defective of protection.
Description of drawings
Fig. 1 is a self-shield type over-voltage and over-current protector spare sketch map;
Among the figure, piezo-resistance 1, ceramic PTC thermistor 2, resettable fuse 3, conductive layer 4, scolding tin 5, lead-in wire 6, seal coating 7.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present technique scheme is further specified as follows:
A kind of resettable fuse type self-shield type over-voltage and over-current protector spare comprises piezo-resistance, ceramic PTC thermistor, resettable fuse and seals coating; Said piezo-resistance two ends connect an end of ceramic PTC thermistor and an end of resettable fuse through conductive layer respectively; An end that is not connected with piezo-resistance of said ceramic PTC thermistor is connected with lead-in wire; An end that is not connected with piezo-resistance of said resettable fuse is connected with lead-in wire; An end that is connected with resettable fuse of said piezo-resistance is connected with lead-in wire; The said coating of sealing is coated in piezo-resistance, ceramic PTC thermistor and resettable fuse surface, only exposes lead-in wire.
Claims (1)
1. a resettable fuse type self-shield type over-voltage and over-current protector spare is characterized in that comprising piezo-resistance, ceramic PTC thermistor, resettable fuse and seals coating; Said piezo-resistance two ends connect an end of ceramic PTC thermistor and an end of resettable fuse through conductive layer respectively; An end that is not connected with piezo-resistance of said ceramic PTC thermistor is connected with lead-in wire; An end that is not connected with piezo-resistance of said resettable fuse is connected with lead-in wire; An end that is connected with resettable fuse of said piezo-resistance is connected with lead-in wire; The said coating of sealing is coated in piezo-resistance, ceramic PTC thermistor and resettable fuse surface, only exposes lead-in wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103636250A CN102403706A (en) | 2011-11-17 | 2011-11-17 | Resettable fuse type self-protective overvoltage/overcurrent protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103636250A CN102403706A (en) | 2011-11-17 | 2011-11-17 | Resettable fuse type self-protective overvoltage/overcurrent protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102403706A true CN102403706A (en) | 2012-04-04 |
Family
ID=45885625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103636250A Pending CN102403706A (en) | 2011-11-17 | 2011-11-17 | Resettable fuse type self-protective overvoltage/overcurrent protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102403706A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779857A (en) * | 2012-10-24 | 2014-05-07 | 孙巍巍 | Novel surge protection device |
| CN109687392A (en) * | 2019-02-15 | 2019-04-26 | 漳州雅宝电子有限公司 | A kind of transient diode mould group with overcurrent and overheat protector |
| TWI792030B (en) * | 2020-08-05 | 2023-02-11 | 富致科技股份有限公司 | Composite circuit protection device |
-
2011
- 2011-11-17 CN CN2011103636250A patent/CN102403706A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103779857A (en) * | 2012-10-24 | 2014-05-07 | 孙巍巍 | Novel surge protection device |
| CN109687392A (en) * | 2019-02-15 | 2019-04-26 | 漳州雅宝电子有限公司 | A kind of transient diode mould group with overcurrent and overheat protector |
| TWI792030B (en) * | 2020-08-05 | 2023-02-11 | 富致科技股份有限公司 | Composite circuit protection device |
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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 |