CN2788314Y - Overcurrent protective element - Google Patents
Overcurrent protective element Download PDFInfo
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- CN2788314Y CN2788314Y CN 200520011425 CN200520011425U CN2788314Y CN 2788314 Y CN2788314 Y CN 2788314Y CN 200520011425 CN200520011425 CN 200520011425 CN 200520011425 U CN200520011425 U CN 200520011425U CN 2788314 Y CN2788314 Y CN 2788314Y
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- protecting element
- current protecting
- inner electrode
- conductive insulating
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Abstract
The utility model discloses an overcurrent protection element, which comprises a positive temperature coefficient element, two heat-conductive insulating layers and a plurality of heat dissipation columns, wherein the positive temperature coefficient element comprises a current sensing layer and two first inner electrode layers which are respectively overlapped on the top and at the bottom of the current sensing layer, the two heat-conductive insulating layers are respectively overlapped on the top and at the bottom of the positive temperature coefficient element, and the heat dissipation columns are penetrated in the heat-conductive insulating layers and connected to the first inner electrode layers.
Description
Technical field
The utility model relates to a kind of over-current protecting element, relates in particular to a kind of over-current protecting element that increases radiating efficiency.
Background technology
For preventing the circuit generation overcurrent (over-current) or the over-current protecting element of mistake high temperature (over-temperature) phenomenon; along with the extensive use of present could carry electrons product (for example mobile phone, notebook computer, hand camera and personal digital aid (PDA) etc.), its importance is also more and more significant.
General positive temperature coefficient (Positive Temperature Coefficient, PCT) resistance value of element is worked as sharp to the reacting phase of variations in temperature, when the PTC element was in normal operating condition, its resistance can maintain suitable low value, and circuit can normally be moved.But; when making temperature rise to a critical temperature when the phenomenon that overcurrent or mistake high temperature take place; its resistance value can snap into a high resistance state (for example more than the 104ohm) moment, and with excessive current reversal payment, to reach the purpose of protection battery or circuit element.Therefore, this PTC element has been integrated in the various circuit element, prevents the infringement of overcurrent.
The structure of a conventional overcurrent protective device 10 as shown in Figure 1, it comprises an electric current sensor 11, two inner electrode layers 12, two insulating barriers 14, two anti-welding enamelled coatings 15 and two outer electrode layers 16.The be placed in current sensing 13 of upper and lower surface to form a similar sandwich structure of this electric current sensor 11 of these two inner electrode layers 12.Because this electric current sensor 11 comprises polymer PTC (the claiming PPTC again) material of conduction, so this current sensing 13 can be described as the PPTC element again.This insulating barrier 14 is arranged at the upper and lower surface of this current sensing 13 respectively, is used for heat conduction and insulation.This anti-welding enamelled coating 15 and outer electrode layer 16 are located at the surface of this insulating barrier 14, the anti-welding and adhesion pad when conduct is welded with the external circuit board respectively.
The heat dissipation path of this over-current protecting element 10 is outsides that ohm heat (ohmic heat) of utilizing external electrode 16 that current sensing 13 time is produced in work is transmitted to this over-current protecting element 10.Yet this heat dissipation design can't make this over-current protecting element 10 obtain good heat radiation when work because area of dissipation is not enough, so that its operating resistance value regular meeting varies with temperature and changes.
The use of over-current protecting element is a trend of complying with the microminiaturization of following element design, makes the heat radiation of element become an important design factor (design factor).Therefore, if a preferred heat dissipation design can be provided, should be able to make over-current protecting element have more stable performance so, even can enlarge its range of application.
The utility model content
Order of the present utility model is to provide a kind of over-current protecting element with great heat radiation effect, and it can have extraordinary stability when work.
In order to achieve the above object, the utility model discloses a kind of over-current protecting element, and it comprises a positive temperature coefficient element, two heat conductive insulating layers and a plurality of thermal column.This positive temperature coefficient element comprises an electric current sensor and two first inner electrode layers.These two first inner electrode layers be stacked at respectively this electric current sensor about.These two heat conductive insulating layers be stacked at respectively this positive temperature coefficient element about.These a plurality of thermal columns are arranged in this heat conductive insulating layer, and are connected to this first inner electrode layer.
Compare with routine techniques; over-current protecting element of the present utility model designs thermal column especially; utilize over-current protecting element can with the space increase heat dissipation path and performance, make over-current protecting element the time reach better stability, and improve its steady-state current in work.
This thermal column can be by aluminium, copper metal or its alloy composition, and it is very easy to production and has cost benefit on making.On performance, because thermal column directly contacts the first inner inner electrode layer, thus ohm heat that electric current sensor is produced effectively can be transmitted to the over-current protecting element outside when working, and increase the efficient that this electric current sensor disperses ohm heat.Therefore, this electric current sensor can keep lower temperature, and the unlikely resistance value that causes jumps, and can improve its steady-state current when work.In addition, in design, this thermal column geometry preferably obtains maximum bulk area to increase radiating effect.
In addition, this heat conductive insulating layer can (as Pre-Peg, P/P) form, it is hot that its volume with abundance absorbs ohm, and can be to over-current protecting element outer scattered heat by the ceramic laminated plates of the heat radiation of tool high thermal conductivity.Design makes over-current protecting element connect face and conducting path with the heat conduction of optimized space utilization and full blast after this manner, and reaches good heat radiation purpose.
Description of drawings
Fig. 1 is the schematic diagram of the over-current protecting element of routine techniques;
Fig. 2 is the stereogram of over-current protecting element of the present utility model;
Fig. 3 is the profile of over-current protecting element of the present utility model; With
Fig. 4 is the profile of another over-current protecting element of the present utility model.
Embodiment
Fig. 2 shows the stereogram of the over-current protecting element 20 of the utility model preferred embodiment.This over-current protecting element 20 comprises a positive temperature coefficient element and its peripheral heat conductive insulating layer 23 and anti-welding enamelled coating up and down 24, two outer electrode layers 26 and a plurality of thermal columns 27.
The profile of Fig. 3 for obtaining along the 1-1 hatching of Fig. 2 wherein comprises an electric current sensor 31, two first inner electrode layers 32, two heat conductive insulating layers 23, two 24, two the second inner electrode layers of anti-welding enamelled coating (solder mask) 35, two outer electrode layers 26 and a plurality of thermal columns 27.These two first inner electrode layers 32 are stacked at the two ends up and down of this electric current sensor 31 respectively, are used for this electric current sensor 31 of conducting.These two first inner electrode layers 32 form a positive temperature coefficient element 38 with the electric current sensor 31 that is clipped in therebetween.Two heat conductive insulating layers 23 place the two ends up and down of positive temperature coefficient element 38 respectively, and two other the second inner electrode layer 35 places the left and right sides of this positive temperature coefficient element 38 respectively, and directly contact with heat conductive insulating layer 23 with first inner electrode layer 32.Two anti-welding enamelled coatings 24 are inserted the two ends up and down of heat conductive insulating layer 23 respectively, and two outer electrode layers 26 place the outside of the second inner electrode layer 35 respectively, and it can be made up of the metal solder flux.A plurality of thermal columns 27 are dispersed in the two ends up and down of positive temperature coefficient element 38 respectively, are attached to this first inner electrode layer 32, and pass heat conductive insulating layer 23 extends to this over-current protecting element 30 with anti-welding enamelled coating 24 outside.
This first inner electrode layer 32, the second inner electrode layer 35 can use the copper metal as heat conduction and the material that electrically conducts with thermal column 37.As shown in Table 1, the copper metal all has good performance on heat conduction and conductivity.Yet the yet alternative use of the material that other heat conductivity and electrical conductivity are good, the utility model does not impose any restrictions.This thermal column 37 can be by aluminium, copper metal or its alloy composition, and described first and second inner electrode layers 32 and 35 can be by nickel, copper metal or its alloy compositions.
Table one
| Heat conductivity (thermal conductivity) | 200 (W/m℃) |
| Electrical conductivity (electrical conductivity) | 0.596*10 6 (siemens/m) |
This electric current sensor 31 can select to use the high molecular positive temperature coefficient material, and this heat conductive insulating layer 23 can select to use the thermal conductive ceramic laminated plates.
This over-current protecting element 30 of the present utility model is produced electric current sensor 31 when working ohm heat penetration is crossed two kinds of heat and is disperseed paths that it is distributed to the outside effectively.It is via thermal column 27 ohm hot type to be gone out that first kind of heat is disperseed the path.The utility model can directly be taken out ohm heat on this first inner electrode layer 32 and guide on this thermal column 27 via suitable design.Because a plurality of thermal columns 27 are being established in these over-current protecting element 30 inside, formation can be put aside first heat reservoir (heat reservoir) of heat energy.As shown in Table 1, the copper metal has good heat transfer, so all heat energy of this first heat reservoir just conduct apace and are distributed in the air outside.Second kind of heat radiation ease path is via heat conductive insulating layer 23 ohm hot type to be gone out.Heat conductive insulating layer 23 is as second heat reservoir of over-current protecting element 30, and the heat energy that inside is produced holds in herein.Except this thermal column 27, heat conductive insulating layer 23 fills up over-current protecting element 30 remaining space, so over-current protecting element 30 inside all are the materials of high heat transfer.
Fig. 4 shows the 1-1 profile of the over-current protecting element of another preferred embodiment of the present utility model, wherein comprises an electric current sensor 41, two first inner electrode layers 42, two heat conductive insulating layers 43, two anti-welding enamelled coatings 44, two outer electrode layers 46 and a plurality of thermal columns 47.These two first inner electrode layers 42 are stacked at the two ends up and down of this electric current sensor 41 respectively, are used for this electric current sensor 41 of conducting.These two first inner electrode layers 42 form a positive temperature coefficient element 48 with the electric current sensor 41 that is clipped in therebetween.Two heat conductive insulating layers 43 place the two ends up and down of positive temperature coefficient element 48 respectively.Two anti-welding enamelled coatings 44 are inserted the two ends up and down of heat conductive insulating layer 43 respectively, and two outer electrode layers 46 place the left and right sides of this over-current protecting element 40 respectively, and it can be made up of the metal solder flux.A plurality of thermal columns 47 are dispersed in the two ends up and down of positive temperature coefficient element 48 respectively, are attached to this first inner electrode layer 42, and pass heat conductive insulating layer 43 extends to this over-current protecting element 40 with anti-welding enamelled coating 44 outside.This first inner electrode layer 42 can use heat conductivity and the good material of electrical conductivity with thermal column 47, as the copper metal.
The experimental data of the over-current protecting element 30 of above preferred embodiment as shown in Table 2, itself and routine techniques all compare on the basis of same resistance value.
Table two
| Routine techniques | The utility model | |
| Radiating efficiency (dissipation efficiency) | 1W/℃ | 7W/℃ |
| Steady-state current I (hold) | 0.75A | 1.1A |
Can find out obviously that from the experimental result of table two over-current protecting element 30 of the present utility model is better than routine techniques really on radiating effect.
Technology contents of the present utility model and technical characterstic disclose as above, yet the those skilled in the art still may be based on teaching of the present utility model and announcement and made all replacement and modifications that does not deviate from the utility model spirit.Therefore, protection range of the present utility model should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present utility model and modifications, and is contained by above claims.
Claims (10)
1. an over-current protecting element comprises a positive temperature coefficient element, two heat conductive insulating layers and a plurality of thermal column; Described positive temperature coefficient element comprises an electric current sensor and two first inner electrode layers that are stacked at described electric current sensor upper and lower surface respectively; Described two heat conductive insulating layers are the upper and lower surfaces that are stacked at described positive temperature coefficient element respectively; It is characterized in that described a plurality of thermal column is to be arranged in described heat conductive insulating layer and to be connected to described first inner electrode layer.
2. over-current protecting element according to claim 1 is characterized in that comprising in addition two anti-welding enamelled coatings, is arranged at the surface of described two heat conductive insulating layers respectively.
3. over-current protecting element according to claim 1 is characterized in that comprising in addition two outer electrode layers, is located at the both sides of described over-current protecting element respectively.
4. over-current protecting element according to claim 1 is characterized in that comprising in addition two the second inner electrode layers, is located at the both sides that described positive temperature is counted element respectively.
5. over-current protecting element according to claim 3 is characterized in that comprising in addition two outer electrode layers, is located at the outside of described two the second inner electrode layers respectively.
6. over-current protecting element according to claim 4 is characterized in that described two outer electrode layers are made up of the metal solder flux.
7. over-current protecting element according to claim 1 is characterized in that described thermal column is by aluminium, copper metal or its alloy composition.
8. over-current protecting element according to claim 3 is characterized in that described first inner electrode layer and described the second inner electrode layer are by nickel, copper metal or its alloy composition.
9. over-current protecting element according to claim 1 is characterized in that described electric current sensor is made up of the high molecular positive temperature coefficient material.
10. over-current protecting element according to claim 1 is characterized in that described two heat conductive insulating layers are made up of the thermal conductive ceramic laminated plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520011425 CN2788314Y (en) | 2005-03-31 | 2005-03-31 | Overcurrent protective element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520011425 CN2788314Y (en) | 2005-03-31 | 2005-03-31 | Overcurrent protective element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2788314Y true CN2788314Y (en) | 2006-06-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520011425 Expired - Fee Related CN2788314Y (en) | 2005-03-31 | 2005-03-31 | Overcurrent protective element |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8111126B2 (en) | 2009-01-16 | 2012-02-07 | Inpaq Technology Co., Ltd. | Over-current protection device and manufacturing method thereof |
| CN103714924A (en) * | 2012-09-28 | 2014-04-09 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN106785922A (en) * | 2017-03-30 | 2017-05-31 | 谷春宁 | A kind of gas discharge tube electrode and preparation method thereof |
| CN108198673A (en) * | 2018-03-12 | 2018-06-22 | 安徽晶格尔电子有限公司 | A kind of high temperature resistant thermistor |
-
2005
- 2005-03-31 CN CN 200520011425 patent/CN2788314Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8111126B2 (en) | 2009-01-16 | 2012-02-07 | Inpaq Technology Co., Ltd. | Over-current protection device and manufacturing method thereof |
| CN103714924A (en) * | 2012-09-28 | 2014-04-09 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103714924B (en) * | 2012-09-28 | 2017-05-24 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN106785922A (en) * | 2017-03-30 | 2017-05-31 | 谷春宁 | A kind of gas discharge tube electrode and preparation method thereof |
| CN106785922B (en) * | 2017-03-30 | 2018-04-06 | 谷春宁 | A kind of gas discharge tube electrode and preparation method thereof |
| CN108521076A (en) * | 2017-03-30 | 2018-09-11 | 谷春宁 | A kind of gas discharge tube electrode and preparation method thereof |
| CN108198673A (en) * | 2018-03-12 | 2018-06-22 | 安徽晶格尔电子有限公司 | A kind of high temperature resistant thermistor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060614 Termination date: 20100331 |