CN102412572A - Temperature switch type over-voltage protection circuit - Google Patents
Temperature switch type over-voltage protection circuit Download PDFInfo
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- CN102412572A CN102412572A CN2011103616172A CN201110361617A CN102412572A CN 102412572 A CN102412572 A CN 102412572A CN 2011103616172 A CN2011103616172 A CN 2011103616172A CN 201110361617 A CN201110361617 A CN 201110361617A CN 102412572 A CN102412572 A CN 102412572A
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- temperature switch
- voltage
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- zinc
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Abstract
The invention relates to a temperature switch type over-voltage protection circuit, which comprises a zinc oxide voltage dependent resistor, a ceramic positive temperature coefficient (PTC) thermal resistor, a temperature switch and a protected circuit, wherein the protected circuit is connected with the temperature switch in series, and then is parallelly connected with a resistor which is obtained by serially connecting the zinc oxide voltage dependent resistor and the ceramic PTC thermal resistor. The technical scheme provided by the invention has the effects that: the reliability of the zinc oxide voltage dependent resistor is improved, voltage-dependent invalidation caused by long-time over-voltage is avoided, and the temperature switch type over-voltage protection circuit is suitable for electronic circuits with various power levels.
Description
Technical field
The present technique scheme belongs to electronic circuit field, specifically is a kind of temperature switch type overvoltage crowbar.
Operation principle:
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 overvoltage crowbar and device, and concrete technical scheme is following:
A kind of temperature switch type overvoltage crowbar comprises Zinc-oxide piezoresistor, ceramic PTC thermistor, temperature switch and by protective circuit; Said be connected in series earlier by protective circuit with temperature switch after, the resistance that obtains of connect with Zinc-oxide piezoresistor and ceramic PTC thermistor again is parallelly connected.
Said temperature switch is the temperature switch that bimetal leaf constitutes.
Said Zinc-oxide piezoresistor and the series connection of ceramic PTC thermistor, an end of temperature switch is connected an end that is not connected with ceramic PTC thermistor of Zinc-oxide piezoresistor, and the other end of temperature switch connects by protective circuit.
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.
Temperature switch is the temperature switch of a kind of bimetal leaf as temperature-sensing element, and during the circuit operate as normal, bimetal leaf is in free state; The contact is in closure/off-state; When temperature was increased to the operating temperature value, bimetallic element was heated and produces internal stress and action rapidly, the opened/closed contact; Cut-out/connection circuit, thus play heat protective effect.To reset temperature be contact auto-closing/disconnections when degree gradually drops to, the recovery normal operating conditions.Be widely used in household electrical appliance motor and electric equipment.
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; PTC thermistor Yin Wendu rising resistance increases rapidly and the protection piezo-resistance is avoided because of long-time overvoltage thermal breakdown, meanwhile temperature switch also Yin Wendu surpass its protection temperature and the contact disconnection will be by the dump of protective circuit.Piezo-resistance is equivalent to open circuit after supply voltage recovers normally, and the temperature of piezo-resistance, PTC thermistor reduces, and temperature switch is closed, and circuit recovers operate as normal.
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, be applicable to the electronic circuit of various watt levels.
Description of drawings
Fig. 1 is the overvoltage crowbar sketch map;
1-Zinc-oxide piezoresistor, 2-pottery PTC thermistor, 3-temperature switch.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present technique scheme is further specified as follows:
A kind of temperature switch type overvoltage crowbar comprises Zinc-oxide piezoresistor, ceramic PTC thermistor, temperature switch and by protective circuit; Said be connected in series earlier by protective circuit with temperature switch after, the resistance that obtains of connect with Zinc-oxide piezoresistor and ceramic PTC thermistor again is parallelly connected.
Said temperature switch is the temperature switch that bimetal leaf constitutes.
Said Zinc-oxide piezoresistor and the series connection of ceramic PTC thermistor, an end of temperature switch is connected an end that is not connected with ceramic PTC thermistor of Zinc-oxide piezoresistor, and the other end of temperature switch connects by protective circuit.
Claims (3)
1. temperature switch type overvoltage crowbar is characterized in that comprising Zinc-oxide piezoresistor, ceramic PTC thermistor, temperature switch and by protective circuit; Said be connected in series earlier by protective circuit with temperature switch after, the resistance that obtains of connect with Zinc-oxide piezoresistor and ceramic PTC thermistor again is parallelly connected.
2. temperature switch type overvoltage crowbar according to claim 1 is characterized in that said temperature switch is the temperature switch that bimetal leaf constitutes.
3. temperature switch type overvoltage crowbar according to claim 1; It is characterized in that the series connection of said Zinc-oxide piezoresistor and ceramic PTC thermistor; One end of temperature switch is connected an end that is not connected with ceramic PTC thermistor of Zinc-oxide piezoresistor, and the other end of temperature switch connects by protective circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103616172A CN102412572A (en) | 2011-11-16 | 2011-11-16 | Temperature switch type over-voltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103616172A CN102412572A (en) | 2011-11-16 | 2011-11-16 | Temperature switch type over-voltage protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102412572A true CN102412572A (en) | 2012-04-11 |
Family
ID=45914492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103616172A Pending CN102412572A (en) | 2011-11-16 | 2011-11-16 | Temperature switch type over-voltage protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102412572A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110752578A (en) * | 2019-10-29 | 2020-02-04 | 温州非迩网络科技有限公司 | Circuit protection device for paper shredder |
| JP2021515370A (en) * | 2018-07-12 | 2021-06-17 | 成都鉄達電子股▲フン▼有限公司Ｃｈｅｎｇｄｕ Ｔｉｅｄａ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏｒｐ． | New lightning protection overvoltage protection device |
-
2011
- 2011-11-16 CN CN2011103616172A patent/CN102412572A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021515370A (en) * | 2018-07-12 | 2021-06-17 | 成都鉄達電子股▲フン▼有限公司Ｃｈｅｎｇｄｕ Ｔｉｅｄａ Ｅｌｅｃｔｒｏｎｉｃｓ Ｃｏｒｐ． | New lightning protection overvoltage protection device |
| JP7041755B2 (en) | 2018-07-12 | 2022-03-24 | 成都鉄達電子股▲フン▼有限公司 | New lightning protection overvoltage protection device |
| CN110752578A (en) * | 2019-10-29 | 2020-02-04 | 温州非迩网络科技有限公司 | Circuit protection device for paper shredder |
| CN110752578B (en) * | 2019-10-29 | 2021-11-30 | 台州市康新电容器有限公司 | Circuit protection device for paper shredder |
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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: 20120411 |