CN207233680U - A kind of surface mount overtemperature and overcurrent protects device - Google Patents
A kind of surface mount overtemperature and overcurrent protects device Download PDFInfo
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- CN207233680U CN207233680U CN201721023547.9U CN201721023547U CN207233680U CN 207233680 U CN207233680 U CN 207233680U CN 201721023547 U CN201721023547 U CN 201721023547U CN 207233680 U CN207233680 U CN 207233680U
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- overcurrent protection
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- protection function
- overheat protector
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Abstract
A kind of surface mount overtemperature and overcurrent protection device is the utility model is related to, belongs to overtemperature and overcurrent protection device arts；Two termination electrodes are electrically connected positioned at overheat protector functional layer and overcurrent protection function layer side and with overheat protector functional layer and overcurrent protection function layer respectively; the interior electrode is electrically connected positioned at overheat protector functional layer and overcurrent protection function layer opposite side and with overheat protector functional layer and overcurrent protection function layer respectively, and the encapsulated layer is covered in the region that functional layer is leaned in the overheat protector functional layer, overcurrent protection function layer, interior electrode and termination electrode；When there is very high current in circuit; since the heat produced in the short time is little; its overheat protector functional layer resistance value can not equally vary widely; also limitation or cut-out electric current can not be played; but it also has overcurrent protection function layer; under high current, very short time will fuse overcurrent protection function layer at this time, so as to reach the function of cut-out electric current.
Description
Technical field
A kind of surface mount overtemperature and overcurrent protection device is the utility model is related to, belongs to overtemperature and overcurrent protection device technology neck
Domain.
Background technology
Many electronic equipments have a rated current, do not allow more than rated current, not so can burn out equipment.So some
Equipment has just done overcurrent protection module.When electric current exceedes setting electric current, equipment automatically powers off, to protect equipment.Such as mainboard
Usb generally has usb overcurrent protections, protects mainboard not to be burned.
With the development of science and technology, electric power/electronic product increasingly variation, complication and miniaturization, are applied
Circuit protecting element nor simple excess temperature or over-current protection device.Due to there is big current problems to be asked with small electric current in circuit
Topic, existing protection device can not solve above-mentioned two situations.
Utility model content
The purpose of this utility model is that the defects of being directed to the prior art and deficiency, there is provided a kind of simple in structure, design is closed
Reason, surface mount overtemperature and overcurrent easy to use protection device, when circuit needs to carry out overheat protector, its overheat protector function
Layer can be improved with temperature resistance value occurs and increased dramatically, to reach limitation electric current by even shutting off electric current, circuit need into
During row overcurrent protection, its overcurrent protection function layer can fuse within a very short time under high current, so as to cut off electric current, reach
To overcurrent protection.
To achieve the above object, the technical solution adopted in the utility model is：It is by insulating substrate, two termination electrodes, interior
Electrode, overheat protector functional layer, overcurrent protection function layer, encapsulated layer composition；The overheat protector functional layer and overcurrent protection work(
Ergosphere is located at insulating substrate upper surface, and two termination electrodes are located at overheat protector functional layer and overcurrent protection function layer side simultaneously respectively
It is electrically connected with overheat protector functional layer and overcurrent protection function layer, the interior electrode is located at overheat protector functional layer and overcurrent respectively
Defencive function layer opposite side is simultaneously electrically connected with overheat protector functional layer and overcurrent protection function layer, and the encapsulated layer is covered in described
The region of functional layer is leaned in overheat protector functional layer, overcurrent protection function layer, interior electrode and termination electrode.
Preferably, the insulating substrate upper and lower surface has overheat protector functional layer, overcurrent protection function layer, interior electrode
And encapsulated layer.
Preferably, at least one overheat protector functional layer, overcurrent protection function layer are connected, overheat protector functional layer and mistake
Stream defencive function layer to be spaced, overheat protector functional layer and 5 number of overcurrent protection function layer can odd number, or even numbers.
Preferably, there is heat-insulating function layer between the overheat protector functional layer, overcurrent protection function layer and insulating substrate.
Preferably, the overcurrent protection function layer surface has arc-suppression function layer.
Preferably, the overcurrent protection function layer is more overcurrent protection function layer parallel-connection structure.
Preferably, the overcurrent protection function layer can be thick film metal layer, thin film metal layer, sheet metal, wire etc.
Middle one or more.
With the above structure, a kind of surface mount overtemperature and overcurrent protection device described in the utility model has with following
Beneficial effect：
1. surface mount overtemperature and overcurrent provided by the utility model protects device, its compared with conventional overheat protector device,
When very high current occurs in circuit, since the heat produced in the short time is little, its overheat protector functional layer resistance value equally can not
Vary widely, can not also play limitation or cut-out electric current, but it also has overcurrent protection function layer, at this time overcurrent protection work(
Under high current, very short time will fuse ergosphere, so as to reach the function of cut-out electric current.
2. surface mount overtemperature and overcurrent provided by the utility model protects device, its compared with conventional over-current protection device,
When less fault current occurs in circuit, its overcurrent protection function layer can not be allowed to fuse quickly since fault current is smaller, together
Sample only works as fault current stream after a period of time, when overcurrent protection function layer temperature reaches its melting temperature metal, just occurs
Fusing, so as to fulfill disengagement failure electric current, but it also has overheat protector functional layer, reaches melting temperature metal in device temperature
Before, its resistance value will increased dramatically, so as to play fault current limiting or cut-out electric current, and can make overcurrent protection function layer
Do not fuse.When fault current is eliminated in circuit, after device temperature reduces, overtemperature and overcurrent protection device can also normal work
Make.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
Put, other attached drawings can also be obtained according to these attached drawings.
Attached drawing 1 is the first structure schematic diagram that surface mount overtemperature and overcurrent protects device in embodiment 1；
Attached drawing 2 is the second structure diagram that surface mount overtemperature and overcurrent protects device in embodiment 1；
Attached drawing 3 is the first structure schematic diagram that surface mount overtemperature and overcurrent protects device in embodiment 2；
Attached drawing 4 is the second structure diagram that surface mount overtemperature and overcurrent protects device in embodiment 2；
Attached drawing 5 is the first structure schematic diagram that surface mount overtemperature and overcurrent protects device in embodiment 3；
Attached drawing 6 is the second structure diagram that surface mount overtemperature and overcurrent protects device in embodiment 3；
Description of reference numerals：
1st, insulating substrate；2nd, termination electrode；3rd, interior electrode；4th, overcurrent protection function layer；5th, excess temperature is protected
Protective function layer；6th, encapsulated layer.
Embodiment
Embodiment one：
The utility model will be further described below with reference to the accompanying drawings.
Referring to as depicted in figs. 1 and 2, a kind of overtemperature and overcurrent protects device, it is two termination electrodes 2, interior by insulating substrate 1
Electrode 3, overheat protector functional layer 4, overcurrent protection function layer 5, encapsulated layer 6 form.The overheat protector functional layer 4 and overcurrent are protected
Protective function layer 5 is located at 1 upper surface of insulating substrate, and two termination electrodes 2 are located at overheat protector functional layer 4 and overcurrent protection respectively
5 side of functional layer is simultaneously electrically connected with overheat protector functional layer 4 and overcurrent protection function layer 5, and the interior electrode 3 is located at excess temperature respectively
Defencive function layer 4 and 5 opposite side of overcurrent protection function layer are simultaneously electrically connected with overheat protector functional layer 4 and overcurrent protection function layer 5
Connect, the encapsulated layer 6 is covered in the overheat protector functional layer 4, overcurrent protection function layer 5, interior electrode 3 and two termination electrodes 2
In lean on functional layer region.
Embodiment two：
The utility model will be further described below with reference to the accompanying drawings.
Referring to as shown in Figure 3 and Figure 4, a kind of overtemperature and overcurrent protects device, it is by insulating substrate 1, two termination electrodes 2, two
A interior electrode 3, two overheat protector functional layers 4, overcurrent protection function layer 5, encapsulated layers 6 form.Described two overheat protector work(
Ergosphere 4 and overcurrent protection function layer 5 are located at 1 upper surface of insulating substrate, and overcurrent protection function layer 5 is located at two overheat protectors
Among functional layer 4, two termination electrodes 2 respectively positioned at two 4 sides of overheat protector functional layer and with two overheat protector work(
Ergosphere 4 is electrically connected, and described two interior electrodes 3 are located at two 4 opposite sides of overheat protector functional layer and overcurrent protection function layer 5 respectively
And be electrically connected with two overheat protector functional layers 4 and overcurrent protection function layer 5, the encapsulated layer 6 is covered in described two excess temperatures
The region of functional layer is leaned in defencive function layer 4,5, two interior electrode 3 of overcurrent protection function layer and two termination electrodes 2.
Embodiment three：
The utility model will be further described below with reference to the accompanying drawings.
Referring to as shown in Figure 5 and Figure 6, a kind of overtemperature and overcurrent protects device, it is by insulating substrate 1, two termination electrodes 2, two
A interior electrode 3, overheat protector functional layer 4, two overcurrent protection function layers 5, encapsulated layers 6 form.The overheat protector functional layer 4
It is located at 1 upper surface of insulating substrate with two overcurrent protection function layers 5, and overheat protector functional layer 4 is located at two overcurrent protection work(
Among ergosphere 5, two termination electrodes 2 respectively positioned at two 5 sides of overcurrent protection function layer and with two overcurrent protection functions
Layer 5 is electrically connected, and described two interior electrodes 3 are located at overheat protector functional layer 4 and two 5 opposite sides of overcurrent protection function layer respectively
And be electrically connected with overheat protector functional layer 4 and two overcurrent protection function layers 5, the encapsulated layer 6 is covered in the overheat protector
The region of functional layer is leaned in the interior electrode 3 of 5, two, overcurrent protection function layer of functional layer 4, two and two termination electrodes 2.
1 upper and lower surface of insulating substrate described in above-mentioned embodiment has overheat protector functional layer, overcurrent protection work(
Ergosphere, interior electrode and encapsulated layer；At least one overheat protector functional layer 4, overcurrent protection function layer 5 are connected, overheat protector function
Layer 4 is to be spaced with overcurrent protection function layer 5, overheat protector functional layer 4 and 5 number of overcurrent protection function layer can odd number,
It can be even numbers；There is heat-insulating function layer between the overheat protector functional layer 4, overcurrent protection function layer 5 and insulating substrate 1；It is described
There is arc-suppression function layer on 5 surface of overcurrent protection function layer；The overcurrent protection function layer 5 is in parallel for more overcurrent protection function layers
Structure；The overcurrent protection function layer 5 can be a kind of or more in thick film metal layer, thin film metal layer, sheet metal, wire etc.
Kind.
Above-mentioned embodiment can reach following beneficial effect：When very high current occurs in circuit, due to the short time
The heat of interior generation is little, its overheat protector functional layer resistance value can not equally vary widely, and can not also play limitation or cut
Power-off stream, but it also has overcurrent protection function layer, and under high current, very short time will occur overcurrent protection function layer at this time
Fusing, so as to reach the function of cut-out electric current；When less fault current occurs in circuit, can not be allowed since fault current is smaller
Its overcurrent protection function layer fuses quickly, same only to work as fault current stream after a period of time, overcurrent protection function layer temperature
When reaching its melting temperature metal, just fuse, so as to fulfill disengagement failure electric current, but it also has the function of overheat protector
Layer, before device temperature reaches melting temperature metal, its resistance value will increased dramatically, so as to play fault current limiting or cut-out
Electric current, and overcurrent protection function layer can be made not fuse.
The above, is merely intended for describing the technical solutions of the present application, but not for limiting the present application, those of ordinary skill in the art couple
The other modifications or equivalent substitution that the technical solution of the utility model is made, without departing from technical solutions of the utility model
Spirit and scope, should all cover among the right of the utility model.
Claims (6)
1. a kind of surface mount overtemperature and overcurrent protects device, it is characterised in that：It by insulating substrate (1), two termination electrodes (2),
Interior electrode (3), overheat protector functional layer (4), overcurrent protection function layer (5), encapsulated layer (6) composition；The overheat protector function
Layer (4) and overcurrent protection function layer (5) are located at insulating substrate (1) upper surface, and two termination electrodes (2) are protected positioned at excess temperature respectively
Protective function layer (4) and overcurrent protection function layer (5) side are simultaneously electric with overheat protector functional layer (4) and overcurrent protection function layer (5)
Connection, the interior electrode (3) is respectively positioned at overheat protector functional layer (4) and overcurrent protection function layer (5) opposite side and and excess temperature
Defencive function layer (4) and overcurrent protection function layer (5) are electrically connected, and the encapsulated layer (6) is covered in the overheat protector functional layer
(4), the region of functional layer is leaned in overcurrent protection function layer (5), interior electrode (3) and termination electrode (2).
A kind of 2. surface mount overtemperature and overcurrent protection device according to claim 1, it is characterised in that：The insulating substrate
(1) upper and lower surface has overheat protector functional layer, overcurrent protection function layer, interior electrode and encapsulated layer.
A kind of 3. surface mount overtemperature and overcurrent protection device according to claim 1, it is characterised in that：It is at least one described
Overheat protector functional layer (4), overcurrent protection function layer (5) series connection, overheat protector functional layer (4) and overcurrent protection function layer (5)
To be spaced, overheat protector functional layer (4) and overcurrent protection function layer (5) number can odd number, or even numbers.
A kind of 4. surface mount overtemperature and overcurrent protection device according to claim 1, it is characterised in that：The overheat protector
There is heat-insulating function layer between functional layer (4), overcurrent protection function layer (5) and insulating substrate (1)；The overcurrent protection function layer
(5) there is arc-suppression function layer on surface.
A kind of 5. surface mount overtemperature and overcurrent protection device according to claim 1, it is characterised in that：The overcurrent protection
Functional layer (5) is more overcurrent protection function layer parallel-connection structure.
A kind of 6. surface mount overtemperature and overcurrent protection device according to claim 1, it is characterised in that：The overcurrent protection
Functional layer (5) can be one or more in thick film metal layer, thin film metal layer, sheet metal, wire etc..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721023547.9U CN207233680U (en) | 2017-08-16 | 2017-08-16 | A kind of surface mount overtemperature and overcurrent protects device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721023547.9U CN207233680U (en) | 2017-08-16 | 2017-08-16 | A kind of surface mount overtemperature and overcurrent protects device |
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| Publication Number | Publication Date |
|---|---|
| CN207233680U true CN207233680U (en) | 2018-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346718A (en) * | 2017-08-16 | 2017-11-14 | 苏州达晶微电子有限公司 | A kind of surface mount overtemperature and overcurrent protection device |
-
2017
- 2017-08-16 CN CN201721023547.9U patent/CN207233680U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107346718A (en) * | 2017-08-16 | 2017-11-14 | 苏州达晶微电子有限公司 | A kind of surface mount overtemperature and overcurrent protection device |
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