CN206370318U - Piezoresistive element with overtemperature protection - Google Patents
Piezoresistive element with overtemperature protection Download PDFInfo
- Publication number
- CN206370318U CN206370318U CN201720025539.1U CN201720025539U CN206370318U CN 206370318 U CN206370318 U CN 206370318U CN 201720025539 U CN201720025539 U CN 201720025539U CN 206370318 U CN206370318 U CN 206370318U
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- CN
- China
- Prior art keywords
- chip
- connection electrode
- piezoresistive element
- insulating coating
- shell
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Abstract
The utility model discloses a kind of piezoresistive element with overtemperature protection, it is related to base electronic Element Technology field.The resistive element includes a voltage dependent resistor chip; the surface of the chip is provided with the first connection electrode and the second connection electrode electrically connected with the electrode of the chip; whole and described connection electrodes of the chip and the coupling part of the chip are wrapped up by insulating coating; the outside of insulating coating is provided with protection device; the combined chip that the protection device, voltage dependent resistor chip and the connection electrode are constituted is located in shell, and the free end of the connection electrode is located at outside the shell.There is short circuit shunting path in the resistive element; the presence of short circuit shunting path has been released surge current; back-end circuit can be also protected to exempt from piezo-resistance deterioration failure affected by surge; and short circuit current flow is easy to be arrived by units tests such as the current insurance silks of front end; so as to the power supply of cut-out whole set equipment in time, it is to avoid further damage.
Description
Technical field
The utility model is related to base electronic Element Technology field, more particularly to a kind of piezo-resistance with overtemperature protection
Element.
Background technology
Piezo-resistance is a kind of votage limit type protection device, with very strong surge absoption ability, is widely used in electronics
In circuit.The main nonlinear characteristic using piezo-resistance, voltage clamping is carried out in overvoltage, absorbs unnecessary electric current, so that
Realize the protection to late-class circuit.
Piezo-resistance can be gradually degraded with the increase of surge absoption number of times, cause the electric current for flowing through piezo-resistance to continue
Increase, temperature is constantly raised, and can finally cause product to explode or on fire.
In order to avoid piezo-resistance triggers serious consequence, it is necessary to carry out overtemperature protection to piezo-resistance, at present in deterioration
Mainly there is two ways：One kind is TMOV, such as with the piezo-resistance of alloy-type temperature fuse；One kind is that hot tripping type is pressure-sensitive
Resistance.The heat produced when being and being deteriorated using piezo-resistance make the fusing of Thermal Cutoffs/trip point and by piezo-resistance from electricity
Road is broken.But, because piezo-resistance is connected in parallel on by the two ends of protection circuit in itself, piezo-resistance is because of deterioration from circuit
After breaking, it is difficult to be discovered by user, and surge may proceed to be transferred to by protection circuit, causes device damage or causes other
, there is potential safety hazard in failure.
Utility model content
Technical problem to be solved in the utility model is how to provide a kind of piezoresistive element with overtemperature protection.
In order to solve the above technical problems, technical solution adopted in the utility model is：It is a kind of with the pressure-sensitive of overtemperature protection
Resistive element, it is characterised in that：Including a voltage dependent resistor chip, the surface of the chip is provided with the electrode electricity with the chip
The first connection electrode and the second connection electrode of connection, whole and described connection electrodes of the chip and the company of the chip
Socket part point is wrapped up by insulating coating, and the outside of insulating coating is provided with protection device, the protection device, piezo-resistance core
The combined chip that piece and the connection electrode are constituted is located in shell, and the free end of the connection electrode is located at the shell
Outside, shell realizes the protection and positioning to internal components.
Further technical scheme is：The protection device be U-shaped elastic component, the two ends of the elastic component with it is described
First connection electrode is corresponding with the second connection electrode.
Further technical scheme is：The making material of the elastic component is copper, copper steel, iron or the iron of conductive material
Nickel；Or the making material of the protection device is PCB material, ABS or PP, and there is conductive path thereon.
Further technical scheme is：The protection device is conductive be filled between shell and insulating coating
Grain.
Further technical scheme is：Being shaped as the conductive particle is circular, square, star or irregular shape.
Further technical scheme is：The making material of the conductive particle is copper, copper steel, iron or the iron of conductive material
Nickel；Or be graphite, the carbon black of conductive nonmetal material；Or there are the plastics of conductive layer, ceramics in surface.
Further technical scheme is：The connection electrode is sheet or lead shape.
Further technical scheme is：The making material of the insulating coating is epoxy resin, silicones or PE films.
Further technical scheme is：The making material of the shell is plastics or ceramics.
It is using the beneficial effect produced by above-mentioned technical proposal：Element described in utility model uses short circuit shunting method
To realize the overtemperature protection to voltage dependent resistor chip.Because insulating coating is fine and close under normal circumstances, make connection electrode with
Protection device is insulated, and the normal service behaviour of piezo-resistance is not influenceed.When piezo-resistance is deteriorated in use, pressure
Quick resistance internal current persistently increases, and temperature is constantly raised, when temperature reaches the glass transition temperature of insulating coating material,
Insulating coating is changed into molten condition by densifie state, conductive path two ends insulating coating is pressed off in the presence of mechanical force and with
Internal connection electrode is in contact, and makes electric current by conductive path short circuit shunting, so as to reduce the electric current for flowing through piezo-resistance, keeps away
Exempt from temperature too high and and trigger the accidents such as fire.The presence of short circuit shunting path has been released surge current, and rear end is by protection circuit
It is unaffected, and short circuit current flow is easy to be arrived by units tests such as the current insurance silks of front end, so as to timely cutting
The power supply of machine equipment, it is to avoid further damage.The utility model is simple in construction, easy to process, and production efficiency is high, is adapted to high-volume
Industrialized production.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is the cross section structure diagram of element described in the utility model embodiment one；
Fig. 2 is the cross section structure diagram of component failure guard mode described in the utility model embodiment one；
Fig. 3 is the cross section structure diagram of element described in the utility model embodiment two；
Fig. 4 is the cross section structure diagram of component failure guard mode described in the utility model embodiment two；
Wherein：1st, the first connection electrode 2, the second connection electrode 3, insulating coating 4, shell 5, elastic component 6, piezo-resistance core
Piece 7, conductive particle.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clear
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the present utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belongs to the scope of the utility model protection.
Many details are elaborated in the following description in order to fully understand the utility model, but this practicality is new
Type can also be different from other manner described here using other implement, and those skilled in the art can be without prejudice to this reality
With doing similar popularization in the case of new intension, therefore the utility model is not limited by following public specific embodiment.
Embodiment one
Fig. 1 is refer to, it is main to include the first connection present embodiment discloses a kind of piezoresistive element with overtemperature protection
Electrode 1, the second connection electrode 2, insulating coating 3, shell 4, protection device and voltage dependent resistor chip 6.In the present embodiment, pressure-sensitive electricity
The electrode on resistance chip 6 both sides links together with the first connection electrode 1 and the second connection electrode 2 respectively.Voltage dependent resistor chip 6 with
And the junction of the connection electrode 1 of voltage dependent resistor chip 6 and first, the second connection electrode 2 is wrapped up by the coating completely of insulating coating 3,
Protection device clamps insulating coating 3 and its internal components, there is conductive path in protection device.
In the present embodiment, the protection device is U-shaped elastic component 5, and the two ends of the elastic component 5 are connected with described first
The connection electrode 2 of electrode 1 and second is corresponding；When voltage dependent resistor chip 6 starts deterioration, the heat of generation melts insulating coating 3
Melt and soften, the two ends of elastic component 5 are pressed into insulating coating 3 and are connected electricity with its internal first connection electrode 1 and second respectively
Pole 2 is in contact, as shown in Fig. 2 the first connection electrode 1 and the second connection electrode 2 are electrically connected by elastic component 5, shunting is fallen to flow through
The electric current of voltage dependent resistor chip, prevents it from continuing to generate heat and trigger the accidents such as fire.
Preferably, the making material material of insulating coating 3 is epoxy resin, and coating method is powder coating.
In the present embodiment, the size of protection device is formed according to the customization of the size of voltage dependent resistor chip 6, and protection device should have
There is certain elasticity, to guarantee firmly to clamp piezo-resistance, and enough mechanical stresses can be provided when it fails.It is preferred that
Ground, protection device is metal material, and itself has conductive path.
Embodiment two
Fig. 3 is refer to, it is main to include the first connection present embodiment discloses a kind of piezoresistive element with overtemperature protection
Electrode 1, the second connection electrode 2, insulating coating 3, shell 4, conductive particle 7 and voltage dependent resistor chip 6.It is pressure-sensitive in the present embodiment
The electrode on the both sides of resistance chip 6 links together with the first connection electrode 1 and the second connection electrode 2 respectively, voltage dependent resistor chip 6
And the junction of the connection electrode 1 of voltage dependent resistor chip 6 and first, the second connection electrode 2 is wrapped by the coating completely of insulating coating 3
Wrap up in.Voltage dependent resistor chip is placed in shell 4, and the inside of shell 4 is filled with conductive particle 7, and conductive particle 7 is close to insulating coating.
When voltage dependent resistor chip 6 starts deterioration, the heat of generation makes insulating coating 3 melt and soften, and conductive particle 7 exists
Self extrusion effect is pushed down into insulating coating 3 and is in contact with its first internal connection electrode 1 and the second connection electrode 2, such as
Shown in Fig. 4, the close-packed arrays of conductive particle 7 formation conductive path, shunting is fallen to flow through the electric current of voltage dependent resistor chip 6.
In the present embodiment, it is preferable that the making material of conductive particle is metal, profile is circle；The size of shell 4 according to
The size customization of voltage dependent resistor chip 6 is formed.
Element described in utility model realizes the overtemperature protection to voltage dependent resistor chip using short circuit shunting method.Due to exhausted
Edge coating is fine and close under normal circumstances, connection electrode is insulated with protection device, does not influence piezo-resistance normally to work
Performance.When piezo-resistance is deteriorated in use, piezo-resistance internal current persistently increases, and temperature is constantly raised,
When temperature reaches the glass transition temperature of insulating coating material, insulating coating is changed into molten condition by densifie state, leads
Electric pathway two ends press off insulating coating in the presence of mechanical force and are in contact with internal connection electrode, electric current is passed through conduction
Path short circuit shunting, so as to reduce the electric current for flowing through piezo-resistance, it is to avoid temperature is too high and and triggers the accidents such as fire.Short circuit point
The presence of logical circulation road has been released surge current, and rear end is unaffected by protection circuit, and short circuit current flow is easy to by front end
Current insurance silk etc. units test arrive, so as in time cut-out whole set equipment power supply, it is to avoid further damage.This practicality is new
Type is simple in construction, easy to process, and production efficiency is high, is adapted to mass industrialized production.
Claims (9)
1. a kind of piezoresistive element with overtemperature protection, it is characterised in that：Including a voltage dependent resistor chip（6）, the core
The surface of piece is provided with the first connection electrode electrically connected with the electrode of the chip（1）With the second connection electrode（2）, the chip
The coupling part of whole and described connection electrodes and the chip pass through insulating coating（3）Wrapped up, insulating coating（3）
Outside be provided with protection device, the protection device, voltage dependent resistor chip（6）And the combined chip that the connection electrode is constituted
Positioned at shell（4）Interior, the free end of the connection electrode is located at the shell（4）Outside, shell（4）Realize the guarantor to internal components
Shield and positioning.
2. the piezoresistive element as claimed in claim 1 with overtemperature protection, it is characterised in that：The protection device is U-shaped
Elastic component（5）, the elastic component（5）Two ends and first connection electrode（1）With the second connection electrode（2）It is corresponding.
3. the piezoresistive element as claimed in claim 2 with overtemperature protection, it is characterised in that：The elastic component（5）System
Make copper, copper steel, iron or iron nickel that material is conductive material；Or the making material of the protection device be PCB material, ABS or PP,
And there is conductive path thereon.
4. the piezoresistive element as claimed in claim 1 with overtemperature protection, it is characterised in that：The protection device is filling
In shell（4）With insulating coating（3）Between conductive particle（7）.
5. the piezoresistive element as claimed in claim 4 with overtemperature protection, it is characterised in that：The conductive particle（7）'s
It is shaped as circular, square, star or irregular shape.
6. the piezoresistive element as claimed in claim 4 with overtemperature protection, it is characterised in that：The conductive particle（7）'s
Making material is copper, copper steel, iron or the iron nickel of conductive material；Or be graphite, the carbon black of conductive nonmetal material；Or surface is led
Plastics, the ceramics of electric layer.
7. the piezoresistive element as claimed in claim 1 with overtemperature protection, it is characterised in that：The connection electrode is sheet
Or lead shape.
8. the piezoresistive element as claimed in claim 1 with overtemperature protection, it is characterised in that：The insulating coating（3）'s
Making material is epoxy resin, silicones or PE films.
9. the piezoresistive element as claimed in claim 1 with overtemperature protection, it is characterised in that：The shell（4）Making
Material is plastics or ceramics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720025539.1U CN206370318U (en) | 2017-01-10 | 2017-01-10 | Piezoresistive element with overtemperature protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720025539.1U CN206370318U (en) | 2017-01-10 | 2017-01-10 | Piezoresistive element with overtemperature protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206370318U true CN206370318U (en) | 2017-08-01 |
Family
ID=59390660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720025539.1U Expired - Fee Related CN206370318U (en) | 2017-01-10 | 2017-01-10 | Piezoresistive element with overtemperature protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206370318U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306173A (en) * | 2017-12-22 | 2018-07-20 | 广东百圳君耀电子有限公司 | Gas-discharge tube |
| CN110189878A (en) * | 2018-04-11 | 2019-08-30 | 谭乔文 | A kind of surge protector MOV chip and preparation method thereof |
-
2017
- 2017-01-10 CN CN201720025539.1U patent/CN206370318U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306173A (en) * | 2017-12-22 | 2018-07-20 | 广东百圳君耀电子有限公司 | Gas-discharge tube |
| CN110189878A (en) * | 2018-04-11 | 2019-08-30 | 谭乔文 | A kind of surge protector MOV chip and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170801 Termination date: 20190110 |