CN201111299Y - Composite type excessive heating protective resistor - Google Patents
Composite type excessive heating protective resistor Download PDFInfo
- Publication number
- CN201111299Y CN201111299Y CNU2007201529963U CN200720152996U CN201111299Y CN 201111299 Y CN201111299 Y CN 201111299Y CN U2007201529963 U CNU2007201529963 U CN U2007201529963U CN 200720152996 U CN200720152996 U CN 200720152996U CN 201111299 Y CN201111299 Y CN 201111299Y
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- resistance
- piezo
- thermistor
- electrode
- resistor
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Abstract
The utility model relates to a complex overheating protection resistor, in which the inside is integrated with a varistor and a thermistor. The resistor has the protection of over heating, over-current, over-voltage and surge with fast response speed, which has the advantages of small size and easy installation.
Description
Technical field:
The utility model relates to a kind of resistor, particularly relates to a kind of overtemperature protection resistor.
Background technology:
Piezo-resistance is to make according to the nonlinear characteristic of semi-conducting material.The voltage of varistor and electric current are not observed Ohm's law, form special non-linear relation, when two ends institute making alive is lower than the nominal rating magnitude of voltage, and the resistance value approach infinity of varistor, inside almost no current is flow through; When two ends institute making alive during a little more than the nominal rating magnitude of voltage, varistor will puncture conducting rapidly, and become low resistive state by high-impedance state, and operating current also sharply increases; When two ends institute making alive was lower than the nominal rating magnitude of voltage, varistor reverted to high-impedance state again; When two ends institute making alive surpassed the maximum constraints magnitude of voltage, varistor can't recover complete punch through damage more voluntarily.Because piezo-resistance has above technical characterstic,, play overvoltage protection, lightning protection, inhibition surge current, absorb spike, amplitude limit, high pressure arc extinguishing, de-noising, protection semiconductor components and devices etc. to be widely used in household electrical appliance and other electronic product.
At present; piezo-resistance is widely used in the overvoltage protection of electronic product; with regard to conventional piezo-resistance; near the voltage long period at its two ends is in the critical conduction magnitude of voltage, or when running into the bigger surge impact of energy, the electric current by piezo-resistance enlarges markedly; the temperature of the ceramic substrate in the piezo-resistance obviously raises; under abnormal conditions, piezo-resistance temperature even can be raised to more than 300 ℃ constitutes the potential safety hazard of fire thus.In order to address this problem, prior art personnel utilize from recovering thermistor has overcurrent and superheat protecting function in circuit, adopts the use that cooperatively interacts of discrete original paper piezo-resistance and thermistor in circuit.The electric current that flows through piezo-resistance during overvoltage increases; cause making electric current reduce to have avoided the piezo-resistance temperature to continue to raise from recovering the thermistor overcurrent and overheating protection; thereby prevent because of the too high fire that causes of piezo-resistance intensification; but in actual use; its response speed is slow; be difficult to resist big electric current etc., have certain defective.
Summary of the invention
The technical problems to be solved in the utility model is that the separate structure to above-mentioned existing scheme improves, and provides a kind of response speed fast, Chinese People's Anti-Japanese Military and Political College's electric current, the hot protection type composite resistor that impact capacity is strong.
The utility model purpose realizes being finished by following technical scheme:
A kind of compound overtemperature protection resistor that the utility model provides is that chip with pressure-sensitive electrification resistance chip and thermo-responsive resistance is superimposed and is packaged into a chip, utilizes heat conducting principle effectively to protect.This compound overtemperature protection resistor of the present utility model.Thermistor is provided with two extraction electrodes 1 and 2, also is provided with two electrodes on piezo-resistance, and one of them electrode is connected with thermistor extraction electrode 2 and is electrode 2 altogether.Another extraction electrode of piezo-resistance is 3.Above-mentioned piezo-resistance and the synthetic chip of thermistor are encapsulated by organic siliconresin again, and the utility model is equipped with 1,2,3 three electrode altogether and draws.The utility model utilizes the advantage of piezo-resistance and thermistor jointly, overcomes the defective of discrete use in circuit, with temperature-sensitive with pressure-sensitively be packaged into a device, has effectively protective effects such as overheated, overcurrent, overvoltage and surge.
Advantage of the present utility model have overheated, overcurrent, overvoltage and surge protection, and response speed is fast, has little, the easy for installation advantage of volume.
Description of drawings
Fig. 1 is a kind of structural representation of compound overtemperature protection resistor
Fig. 2 is a kind of A-A cutaway view of compound overtemperature protection resistor
Fig. 3 is a kind of equivalent circuit diagram of compound overtemperature protection resistor
Among Fig. 1,2,3, the lead-in wire of 1 thermistor (RT1) electrode, the lead-in wire of 2 piezo-resistances (RV1) and thermistor common electrode, the lead-in wire of 3 piezoresistance electrodes, the substrate of 4 piezo-resistances, the substrate of 5 thermistors, 6 organic siliconresin encapsulating materials.
Embodiment
The utility model is described in further detail by embodiment below in conjunction with accompanying drawing.So that industry technical staff's understanding: the compound overtemperature protection resistor of a kind of the utility model illustrated in figures 1 and 2 is that voltage-sensitive ceramic substrate and thermal sensitive ceramics substrate are superimposed.Thermistor is provided with two extraction electrodes 1 and 2, also is provided with two electrodes on piezo-resistance, and one of them electrode is connected with thermistor extraction electrode 2 and is an electrode altogether.Another extraction electrode of piezo-resistance is 3.Above-mentioned piezo-resistance and the synthetic chip of thermistor are encapsulated by organic siliconresin again, are equipped with 1,2,3 three electrode altogether, draw with tinned lead respectively,
Below we utilize Fig. 3 to come the operation principle of circuit protection is analyzed again, when 1,3 input current signal overcurrents, surpass the operating current of thermistor RT1, the RT1 temperature raises, it is big that resistance becomes, electric current reaches certain value, the infinity that the RT1 resistance becomes, cutoff circuit, when thermistor is overheated, it is big that the resistance of RT1 becomes, and makes open circuit, plays a protective role; When overtension that input 1,3 adds, the electric current that flows through pressure-sensitive electrification resistance RV1 strengthens, and the temperature of piezo-resistance raises, and passes to the temperature of RT1 rapidly, and the electric current that flows through RT1 also strengthens, and it is big that resistance becomes, and RT1 is opened a way rapidly, and circuit is played a protective role.Thereby in circuit, can realize protections such as overheated, overcurrent, overvoltage and surge protection.
Claims (3)
1. compound overtemperature protection resistor; form by piezo-resistance and thermistor; it is characterized in that voltage-sensitive ceramic substrate and thermal sensitive ceramics substrate are superimposed; synthetic a kind of new chip; be provided with 1,2,3 three electrode altogether, an electrode of thermistor is connected with an electrode of piezo-resistance and is electrode 2 altogether.
2. the described a kind of compound overtemperature protection resistor of claim 1,1,3 as input, and 2,3 as output.
3. the described a kind of compound overtemperature protection resistor of claim 1, the synthetic chip of described piezo-resistance and thermistor is encapsulated by organic siliconresin,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201529963U CN201111299Y (en) | 2007-06-22 | 2007-06-22 | Composite type excessive heating protective resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201529963U CN201111299Y (en) | 2007-06-22 | 2007-06-22 | Composite type excessive heating protective resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201111299Y true CN201111299Y (en) | 2008-09-03 |
Family
ID=39895837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201529963U Expired - Fee Related CN201111299Y (en) | 2007-06-22 | 2007-06-22 | Composite type excessive heating protective resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201111299Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632784A (en) * | 2013-11-23 | 2014-03-12 | 华中科技大学 | Lamination sheet-type heat and pressure sensitive composite resistor and preparation method thereof |
| CN106972474A (en) * | 2017-04-14 | 2017-07-21 | 陆饶丹 | A kind of over-pressed protection module and electrical equipment |
| WO2021031766A1 (en) * | 2019-08-22 | 2021-02-25 | 成都铁达电子股份有限公司 | Voltage limiting circuit |
-
2007
- 2007-06-22 CN CNU2007201529963U patent/CN201111299Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632784A (en) * | 2013-11-23 | 2014-03-12 | 华中科技大学 | Lamination sheet-type heat and pressure sensitive composite resistor and preparation method thereof |
| CN103632784B (en) * | 2013-11-23 | 2016-04-13 | 华中科技大学 | Quick composite resistor of a kind of lamination sheet type hot pressing and preparation method thereof |
| CN106972474A (en) * | 2017-04-14 | 2017-07-21 | 陆饶丹 | A kind of over-pressed protection module and electrical equipment |
| WO2021031766A1 (en) * | 2019-08-22 | 2021-02-25 | 成都铁达电子股份有限公司 | Voltage limiting circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080903 Termination date: 20150622 |
|
| EXPY | Termination of patent right or utility model |