CN204204542U - There is the temperature-sensitive device of over-voltage protecting function, protective circuit and electronic equipment - Google Patents
There is the temperature-sensitive device of over-voltage protecting function, protective circuit and electronic equipment Download PDFInfo
- Publication number
- CN204204542U CN204204542U CN201420626512.4U CN201420626512U CN204204542U CN 204204542 U CN204204542 U CN 204204542U CN 201420626512 U CN201420626512 U CN 201420626512U CN 204204542 U CN204204542 U CN 204204542U
- Authority
- CN
- China
- Prior art keywords
- pin
- zinc
- ptc thermistor
- barium titanate
- temperature
- 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.)
- Active
Links
Landscapes
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
There is a temperature-sensitive device for over-voltage protecting function, comprise Zinc-oxide piezoresistor body, barium titanate series PTC thermistor body, the first pin, the second pin and the 3rd pin; First electrode of described Zinc-oxide piezoresistor body welds with the first electrode adhesion of described barium titanate series PTC thermistor body and is connected described first pin; second pin described in second Electrode connection of described Zinc-oxide piezoresistor body; described in second Electrode connection of described barium titanate series PTC thermistor body, the 3rd pin incorporates the function of barium titanate series PTC thermistor and Zinc-oxide piezoresistor, has overcurrent, overvoltage, overheated comprehensive protection function simultaneously.In addition, a kind of protective circuit and electronic equipment is also provided.
Description
Technical field
The utility model relates to electronic technology, particularly relates to a kind ofly having the temperature-sensitive device of over-voltage protecting function, the protective circuit applying it and electronic equipment.
Background technology
PTC thermistor has nonlinear resistance temperature characterisitic, does overcurrent, overtemperature protection for substituting traditional Fuse Type fuse in various electronic circuit.Its operation principle is: when circuit is in normal condition, is less than rated current by the electric current of PTC thermistor, and the PTC thermistor resistance that is in the normal state is very little, can not affect the normal work of protected circuit.When circuit breaks down, when electric current substantially exceeds rated current, PTC thermistor is generated heat rapidly and is high-impedance state, make circuit be in relative "off" state, thus protective circuit is not damaged.When after failture evacuation, PTC thermistor also automatically returns to low resistance state, and circuit recovers normal work.PTC thermistor is in current foldback circuit; PTC thermistor is normally worked under high ambient temperature and high working voltage; just must increase substantially the rated operational current of PTC thermistor, but the possibility that its result causes PTC thermistor overvoltage protection when normal temperature or low temperature to be protected slowly or not.
Utility model content
Based on this, be necessary to provide a kind of temperature-sensitive device also when normal temperature or low temperature with over-voltage protecting function.In addition, a kind of protective circuit and electronic equipment is also provided.
There is a temperature-sensitive device for over-voltage protecting function, comprise Zinc-oxide piezoresistor body, barium titanate series PTC thermistor body, the first pin, the second pin and the 3rd pin;
First electrode of described Zinc-oxide piezoresistor body welds with the first electrode adhesion of described barium titanate series PTC thermistor body and is connected described first pin, second pin described in second Electrode connection of described Zinc-oxide piezoresistor body, the 3rd pin described in the second Electrode connection of described barium titanate series PTC thermistor body.
Wherein in an embodiment, also comprise encapsulated layer, described encapsulated layer encapsulates described Zinc-oxide piezoresistor body and described barium titanate series PTC thermistor body.
Wherein in an embodiment, described encapsulated layer is organic siliconresin or epoxy resin.
Wherein in an embodiment, the first electrode of described Zinc-oxide piezoresistor body and the first electrode of described barium titanate series PTC thermistor body are welded by tin cream adhering and solidifying.
Wherein in an embodiment, described first pin, the second pin and the 3rd pin are zinc-plated pin.
A kind of protective circuit, comprise the above-mentioned temperature-sensitive device with over-voltage protecting function, described first pin connects output voltage, described second pin ground connection, and described 3rd pin connects input voltage.
A kind of electronic equipment, comprises above-mentioned protective circuit.
The above-mentioned temperature-sensitive device with over-voltage protecting function, incorporates the function of barium titanate series PTC thermistor and Zinc-oxide piezoresistor, has overcurrent, overvoltage, overheated comprehensive protection function simultaneously.The temperature-sensitive device with over-voltage protecting function may be used for the elementary protection of transformer.
Above-mentioned protective circuit and electronic equipment, barium titanate series PTC thermistor body is connected on circuit, and Zinc-oxide piezoresistor is connected in parallel on circuit.When circuit there is overvoltage; first Zinc-oxide piezoresistor response voltage conducting; simultaneously barium titanate series PTC thermistor body because the self-heating that causes of fault current and Zinc-oxide piezoresistor body overvoltage time the temperature that produces make the resistance value of barium titanate series PTC thermistor body increase rapidly thus open a way; bear dividing potential drop in very short time, fall stream, Zinc-oxide piezoresistor body and late-class circuit are protected.Because thermistor and piezo-resistance are packaged together, the temperature produced after utilizing piezo-resistance overvoltage makes thermistor response speed faster, thus reaches better protected effect.
Accompanying drawing explanation
Fig. 1 is the temperature-sensitive device schematic diagram with over-voltage protecting function of an embodiment;
Fig. 2 is the protective circuit figure of an embodiment.
Embodiment
For the ease of understanding the utility model, below with reference to relevant drawings, the utility model is described more fully.Preferred embodiment of the present utility model is given in accompanying drawing.But the utility model can realize in many different forms, is not limited to embodiment described herein.On the contrary, provide the object of these embodiments be make the understanding of disclosure of the present utility model more comprehensively thorough.
Unless otherwise defined, all technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model understand usually.The object of the term used in specification of the present utility model herein just in order to describe specific embodiment, is not intended to limit the utility model.Term as used herein "and/or" comprises arbitrary and all combinations of one or more relevant Listed Items.
Barium titanate (BaTiO
3) pottery is a kind of excellent ferroelectric material; in ferroelectric region, resistivity is little; significantly rise in para-electric zone resistance rate; thus barium titanate series PTC thermistor is a kind of PTC thermistor with excellent overheated overcurrent performance, but the possibility that when it also exists normal temperature or low temperature, overvoltage protection is protected slowly or not.
Zinc-oxide piezoresistor has nonlinear voltage-current characteristic, in electronic circuit as anti-overvoltage, lightning-preventing protector part.Its operation principle is connected to by varistor on protected circuit, and when the operational voltage value of line voltage distribution lower than piezo-resistance, varistor resistance is high, is close to open circuit, thus can not affects the normal work of device or electric equipment; When voltage instantaneous is higher than a certain numerical value, varistor resistance declines rapidly, conducting big current, by voltage clamp in the voltage range that protected device or electric equipment can bear thus protection protected device or electric equipment.Zinc-oxide piezoresistor absorbs energy when conducting, and own temperature raises rapidly, but during piezo-resistance conducting, absorbent energy is limited, causes piezo-resistance temperature too high and thermal breakdown inefficacy blast even on fire if energy crosses senior general.
Therefore, if Zinc-oxide piezoresistor and barium titanate series PTC thermistor can be combined, the effect of mutual supplement with each other's advantages, defect counteracting will be reached.
There is a temperature-sensitive device for over-voltage protecting function, comprise Zinc-oxide piezoresistor body, barium titanate series PTC thermistor body, the first pin, the second pin and the 3rd pin.
First electrode of Zinc-oxide piezoresistor body welds with the first electrode adhesion of barium titanate series PTC thermistor body and is connected the first pin, second Electrode connection second pin of Zinc-oxide piezoresistor body, the second Electrode connection the 3rd pin of barium titanate series PTC thermistor body.
The above-mentioned temperature-sensitive device with over-voltage protecting function, incorporates the function of barium titanate series PTC thermistor and Zinc-oxide piezoresistor, has overcurrent, overvoltage, overheated comprehensive protection function simultaneously.
Fig. 1 is the temperature-sensitive device schematic diagram with over-voltage protecting function of an embodiment.
A kind of temperature-sensitive device with over-voltage protecting function; comprise Zinc-oxide piezoresistor body 100, barium titanate series PTC thermistor body 200, first pin 300, second pin 400, the 3rd pin 500 and encapsulated layer 700, encapsulated layer 700 encapsulates Zinc-oxide piezoresistor body 100 and barium titanate series PTC thermistor body 200.Encapsulated layer 700 can be organic siliconresin or epoxy resin, and effect is to improve device stable degree.In other embodiments; better superheat protecting function is played in order to make barium titanate series PTC thermistor body 200; encapsulated layer 700 can not be needed, or only between Zinc-oxide piezoresistor body 100 and barium titanate series PTC thermistor body 200 silica filled organopolysiloxane resin or epoxy resin improve stable degree.
First electrode of Zinc-oxide piezoresistor body 100 and the first electrode of barium titanate series PTC thermistor body 200 are welded by tin cream 600 adhering and solidifying and are connected the first pin 300, second Electrode connection second pin 400 of Zinc-oxide piezoresistor body 100, the second Electrode connection the 3rd pin 500 of barium titanate series PTC thermistor body 200.Concrete manufacturing process is, is bonded by tin cream 600 at the first electrode of Zinc-oxide piezoresistor body 100 and the first electrode of barium titanate series PTC thermistor body 200, and then crosses baker and melt tin and make both be close to and weld together.First pin 300, second pin 400 and the 3rd pin 500 can be zinc-plated pin, improve the weldability of device.
Barium titanate series PTC thermistor body and Zinc-oxide piezoresistor body are united two into one, incorporates the function of thermistor and piezo-resistance, there is overcurrent, overvoltage, overheated comprehensive protection function simultaneously.When circuit there is overvoltage; first Zinc-oxide piezoresistor response voltage conducting; simultaneously barium titanate series PTC thermistor body because the self-heating that causes of fault current and Zinc-oxide piezoresistor body overvoltage time the temperature that produces make the resistance value of barium titanate series PTC thermistor body increase rapidly thus open a way; bear dividing potential drop in very short time, fall stream, Zinc-oxide piezoresistor body and late-class circuit are protected.
Because barium titanate series PTC thermistor and Zinc-oxide piezoresistor are packaged together, the temperature produced after utilizing Zinc-oxide piezoresistor overvoltage makes barium titanate series PTC thermistor response speed faster, thus reaches better protected effect.After completing overvoltage protection; Zinc-oxide piezoresistor does not participate in work; the effect that one is similar to fin is played again at Zinc-oxide piezoresistor; the suitable temperature reducing barium titanate series PTC thermistor; reduce the resistance value of barium titanate series PTC thermistor, namely reduce the voltage drop of barium titanate series PTC thermistor.
The above-mentioned temperature-sensitive device with over-voltage protecting function can effectively solve following problem:
1, improve the reliability of Zinc-oxide piezoresistor, avoid Zinc-oxide piezoresistor to cause Zinc-oxide piezoresistor to lose efficacy because of long-time overvoltage.
2, accelerate the protection speed of barium titanate series PTC thermistor, solve barium titanate series PTC thermistor not protection problem under normal temperature or low temperature.
3, reduce barium titanate series PTC thermistor protection speed by the impact of ambient temperature, solve barium titanate series PTC thermistor misoperation problem when high temperature.
Fig. 2 is the protective circuit figure of an embodiment.
A kind of protective circuit; comprise above-mentioned temperature-sensitive device 10, first pin 300 with over-voltage protecting function and meet output voltage VO UT, the second pin 400 ground connection; 3rd pin 500 connects input voltage VIN, and the first pin 300 is connected protected circuit 20 with the second pin 400.There is equivalent circuit Fig. 2 of the temperature-sensitive device 10 of over-voltage protecting function, comprise piezo-resistance VSR and semistor PTC.
Also disclose a kind of electronic equipment, comprise above-mentioned protective circuit.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (7)
1. there is a temperature-sensitive device for over-voltage protecting function, it is characterized in that, comprise Zinc-oxide piezoresistor body, barium titanate series PTC thermistor body, the first pin, the second pin and the 3rd pin;
First electrode of described Zinc-oxide piezoresistor body welds with the first electrode adhesion of described barium titanate series PTC thermistor body and is connected described first pin, second pin described in second Electrode connection of described Zinc-oxide piezoresistor body, the 3rd pin described in the second Electrode connection of described barium titanate series PTC thermistor body.
2. the temperature-sensitive device with over-voltage protecting function according to claim 1, is characterized in that, also comprise encapsulated layer, and described encapsulated layer encapsulates described Zinc-oxide piezoresistor body and described barium titanate series PTC thermistor body.
3. the temperature-sensitive device with over-voltage protecting function according to claim 2, is characterized in that, described encapsulated layer is organic siliconresin or epoxy resin.
4. the temperature-sensitive device with over-voltage protecting function according to claim 1, is characterized in that, the first electrode of described Zinc-oxide piezoresistor body and the first electrode of described barium titanate series PTC thermistor body are welded by tin cream adhering and solidifying.
5. the temperature-sensitive device with over-voltage protecting function according to claim 1, is characterized in that, described first pin, the second pin and the 3rd pin are zinc-plated pin.
6. a protective circuit, is characterized in that, comprises the temperature-sensitive device with over-voltage protecting function described in any one of Claims 1 to 5, and described first pin connects output voltage, described second pin ground connection, and described 3rd pin connects input voltage.
7. an electronic equipment, is characterized in that, comprises protective circuit according to claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420626512.4U CN204204542U (en) | 2014-10-25 | 2014-10-25 | There is the temperature-sensitive device of over-voltage protecting function, protective circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420626512.4U CN204204542U (en) | 2014-10-25 | 2014-10-25 | There is the temperature-sensitive device of over-voltage protecting function, protective circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204204542U true CN204204542U (en) | 2015-03-11 |
Family
ID=52662474
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420626512.4U Active CN204204542U (en) | 2014-10-25 | 2014-10-25 | There is the temperature-sensitive device of over-voltage protecting function, protective circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204204542U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779023A (en) * | 2015-04-15 | 2015-07-15 | 江苏晟芯微电子有限公司 | Flat-panel type semiconductor element device for circuit protection |
| CN106972474A (en) * | 2017-04-14 | 2017-07-21 | 陆饶丹 | A kind of over-pressed protection module and electrical equipment |
| CN110212509A (en) * | 2019-06-25 | 2019-09-06 | 厦门市三宝盈科电子有限公司 | A kind of compound protection device |
-
2014
- 2014-10-25 CN CN201420626512.4U patent/CN204204542U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104779023A (en) * | 2015-04-15 | 2015-07-15 | 江苏晟芯微电子有限公司 | Flat-panel type semiconductor element device for circuit protection |
| CN104779023B (en) * | 2015-04-15 | 2017-08-08 | 苏州聚达晟芯微电子有限公司 | A kind of circuit protection plate type semiconductor component |
| CN106972474A (en) * | 2017-04-14 | 2017-07-21 | 陆饶丹 | A kind of over-pressed protection module and electrical equipment |
| CN110212509A (en) * | 2019-06-25 | 2019-09-06 | 厦门市三宝盈科电子有限公司 | A kind of compound protection device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201036096Y (en) | Composite type positive temperature coefficient thermal resistance | |
| CN103346547B (en) | A kind of Thunder-prevention overvoltage protection device | |
| CN204204542U (en) | There is the temperature-sensitive device of over-voltage protecting function, protective circuit and electronic equipment | |
| WO2017185847A1 (en) | Overcurrent and overvoltage protection device and method | |
| CN103311914A (en) | Overvoltage production circuit of composite type piezoresistor | |
| CN202207069U (en) | Household cooking equipment | |
| CN103457253A (en) | Over-voltage absorbing protective circuit capable of accurately presetting protection value | |
| CN202282601U (en) | Protection circuit combining high-polymer phenylthiocarbamide (PTC) thermistor and piezoresistor | |
| CN104332944A (en) | Pressure-sensitive and thermosensitive combined type overvoltage and over-current protecting device | |
| CN104779601A (en) | Overvoltage protection device and method | |
| CN104578032A (en) | Over-voltage protector | |
| JP5192002B2 (en) | Surge energy conversion circuit | |
| CN102751707A (en) | Overcurrent and overvoltage protector with bimetallic strip temperature switch | |
| CN203434613U (en) | Lightning protection overvoltage protection device | |
| CN102403705A (en) | Thermistor type over-current and over-voltage protection device | |
| WO2011070235A1 (en) | Electronic protection circuit and protection device | |
| CN105981251B (en) | A kind of overvoltage protection with leakage-current-interrupting | |
| CN102522736A (en) | Self-protecting type over-voltage and over-current protective device with double thermistors | |
| CN204391717U (en) | A kind of Novel electric surge protector | |
| CN102403710A (en) | Thermistor type overvoltage/overcurrent protection circuit | |
| CN102403704A (en) | Overcurrent overvoltage protection device | |
| CN201111299Y (en) | Composite type excessive heating protective resistor | |
| US10283296B2 (en) | Controllable circuit protector for power supplies with different voltages | |
| CN205959703U (en) | Hot protection type piezoresistor | |
| CN107565508A (en) | TVS protective devices with failure breaking function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |