CN102522736A - Self-protecting type over-voltage and over-current protective device with double thermistors - Google Patents
Self-protecting type over-voltage and over-current protective device with double thermistors Download PDFInfo
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- CN102522736A CN102522736A CN201110361570XA CN201110361570A CN102522736A CN 102522736 A CN102522736 A CN 102522736A CN 201110361570X A CN201110361570X A CN 201110361570XA CN 201110361570 A CN201110361570 A CN 201110361570A CN 102522736 A CN102522736 A CN 102522736A
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- ptc thermistor
- ceramic ptc
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- piezoresistor
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Abstract
The invention relates to a self-protecting type over-voltage and over-current protective device with double thermistors. The self-protecting type over-voltage and over-current protective device comprises a piezoresistor, a first ceramic PTC (Positive Temperature Coefficient) thermistor, a second ceramic PTC thermistor and an encapsulating coating, wherein two ends of the piezoresistor are connected with the first ceramic PTC thermistor and the second ceramic PTC thermistor through a conducting layer respectively; a leading wire is connected to the connection end of the piezoresistor, which is connected with the second ceramic PTC thermistor; a leading wire is connected to one end of the second ceramic PTC thermistor, which is not connected with the piezoresistor; a leading wire is connected to one end of the first ceramic PTC thermistor, which is not connected with the piezoresistor; the encapsulating coating is coated outside the piezoresistor, the first ceramic PTC thermistor and the second ceramic PTC thermistor; and only the leading wires are exposed. The technical scheme provided by the invention has the effects as follows: the reliability of a zinc oxide piezoresistor is increased; pressure sensitive failure caused by long-time over-voltage is avoided; and the pressure sensitive failure condition of the conventional over-voltage and over-current protective device, caused by over-slow protection of the thermistors, is solved.
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 pair of thermistor self-shield type over-voltage and over-current protector spare comprises piezo-resistance, the first ceramic PTC thermistor, the second ceramic PTC thermistor and seals coating; The two ends of said piezo-resistance are connected with the second ceramic PTC thermistor with the first ceramic PTC thermistor through conductive layer respectively; Said piezo-resistance be connected with lead-in wire with the second ceramic PTC thermistor link; An end that is not connected with piezo-resistance of the second ceramic PTC thermistor is connected with lead-in wire, and an end that is not connected with piezo-resistance of the first ceramic PTC thermistor is connected with lead-in wire; The said coating of sealing is coated in outside piezo-resistance, the first ceramic PTC thermistor and the second ceramic PTC thermistor, 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.Simultaneously ceramic PTC thermistor also is widely used in and substitutes traditional Fuse Type fuse in the various electronic circuits and do overcurrent, overload protection.Its operation principle is: when circuit was in normal condition, the electric current through ceramic PTC thermistor was less than rated current, and the PTC thermistor is in the normal state, and resistance is very little, can not influence by the operate as normal of protective circuit.When circuit breaks down, when electric current substantially exceeded rated current, the PTC thermistor suddenly generated heat, and is high-impedance state, make circuit be in relatively " disconnection " state, thereby protective circuit was not damaged.After fault was got rid of, overcurrent protection also automatically returned to low resistance state with the PTC thermistor, and circuit recovers operate as normal.
This technical scheme fits tightly and is packaged into one with piezo-resistance 1, first ceramic PTC thermistor 2, the second ceramic PTC thermistor 3, makes this device when overpressure conditions appears in circuit, be able to react fast and protects.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 the first ceramic PTC thermistor 2; The first ceramic PTC thermistor 2 protects piezo-resistance to avoid because of long-time overvoltage thermal breakdown because of temperature rising resistance increases rapidly; Meanwhile the second ceramic PTC thermistor 3 also raises because of temperature and the self-heating temperature that the first 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 thermistor.
Description of drawings
Fig. 1 is the structural representation from this device;
Among the figure, the ceramic PTC thermistor of the ceramic PTC thermistor of piezo-resistance 1, first 2, second 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 pair of thermistor self-shield type over-voltage and over-current protector spare comprises piezo-resistance, the first ceramic PTC thermistor, the second ceramic PTC thermistor and seals coating; The two ends of said piezo-resistance are connected with the second ceramic PTC thermistor with the first ceramic PTC thermistor through conductive layer respectively; Said piezo-resistance be connected with lead-in wire with the second ceramic PTC thermistor link; An end that is not connected with piezo-resistance of the second ceramic PTC thermistor is connected with lead-in wire, and an end that is not connected with piezo-resistance of the first ceramic PTC thermistor is connected with lead-in wire; The said coating of sealing is coated in outside piezo-resistance, the first ceramic PTC thermistor and the second ceramic PTC thermistor, only exposes lead-in wire.
Claims (1)
1. a two thermistor self-shield type over-voltage and over-current protector spare is characterized in that comprising piezo-resistance, the first ceramic PTC thermistor, the second ceramic PTC thermistor and seals coating; The two ends of said piezo-resistance are connected with the second ceramic PTC thermistor with the first ceramic PTC thermistor through conductive layer respectively; Said piezo-resistance be connected with lead-in wire with the second ceramic PTC thermistor link; An end that is not connected with piezo-resistance of the second ceramic PTC thermistor is connected with lead-in wire, and an end that is not connected with piezo-resistance of the first ceramic PTC thermistor is connected with lead-in wire; The said coating of sealing is coated in outside piezo-resistance, the first ceramic PTC thermistor and the second ceramic PTC thermistor, only exposes lead-in wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110361570XA CN102522736A (en) | 2011-11-16 | 2011-11-16 | Self-protecting type over-voltage and over-current protective device with double thermistors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110361570XA CN102522736A (en) | 2011-11-16 | 2011-11-16 | Self-protecting type over-voltage and over-current protective device with double thermistors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102522736A true CN102522736A (en) | 2012-06-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110361570XA Pending CN102522736A (en) | 2011-11-16 | 2011-11-16 | Self-protecting type over-voltage and over-current protective device with double thermistors |
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| CN (1) | CN102522736A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332944A (en) * | 2014-10-27 | 2015-02-04 | 华南理工大学 | Pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device |
| US11289902B2 (en) * | 2020-03-30 | 2022-03-29 | Fuzetec Technology Co., Ltd. | Composite circuit protection device |
| TWI792030B (en) * | 2020-08-05 | 2023-02-11 | 富致科技股份有限公司 | Composite circuit protection device |
| TWI809273B (en) * | 2020-05-08 | 2023-07-21 | 富致科技股份有限公司 | Composite circuit protection device |
-
2011
- 2011-11-16 CN CN201110361570XA patent/CN102522736A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104332944A (en) * | 2014-10-27 | 2015-02-04 | 华南理工大学 | Pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device |
| CN104332944B (en) * | 2014-10-27 | 2017-10-20 | 华南理工大学 | A kind of pressure-sensitive temperature-sensitive compound type overvoltage over-current protection device |
| US11289902B2 (en) * | 2020-03-30 | 2022-03-29 | Fuzetec Technology Co., Ltd. | Composite circuit protection device |
| TWI809273B (en) * | 2020-05-08 | 2023-07-21 | 富致科技股份有限公司 | Composite circuit protection device |
| 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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| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120627 |