CN1627453A - Over current protection element - Google Patents
Over current protection element Download PDFInfo
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- CN1627453A CN1627453A CN 200310120251 CN200310120251A CN1627453A CN 1627453 A CN1627453 A CN 1627453A CN 200310120251 CN200310120251 CN 200310120251 CN 200310120251 A CN200310120251 A CN 200310120251A CN 1627453 A CN1627453 A CN 1627453A
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- current sensing
- protecting element
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Abstract
The over current protection element includes a current sensing element, two insulating layers and two electrode layers. The current sensing element contains two electrode foils and a current sensing layer between two electrode foils. The said current sensing layer is composed of materials with positive temperature coefficients. Two insulating layers are piled on upper and lower surfaces of the current sensing element respectively. Transition temperature of glass is between 90-120 deg.C or efficiency of heat elimination is between 1-7W/deg.C-m. Two insulating layers are connected to two ends of current sensing element respectively. The disclosed current protection element reduces rising bounce rate of resistance between before and after pressfitting procedure, improves efficiency of heat elimination in order to raise operation current and widens application range further.
Description
Technical field
The invention relates to a kind of over-current protecting element, particularly about a kind of over-current protecting element that improves operating current.
Background technology
Known positive temperature coefficient (Positive Temperature Coefficient, PTC) work as sharp to the reacting phase of variations in temperature by the resistance value of element.When PTC element during in normal behaviour in service, its resistance can be kept utmost point low value and make circuit be able to normal operation.But when making temperature rise to a critical temperature when the phenomenon that overcurrent or mistake high temperature take place; its resistance can bounce to a high resistance (for example more than the 104ohm) moment; thereby excessive current reversal is offset, to reach the purpose of protection battery or circuit element.Therefore this PTC element has been integrated in the various circuit elements, to prevent the infringement of overcurrent.
Traditional over-current protecting element comprise a current sensing element and two prepregs (Pre-Preg, P/P).This prepreg is by the folded surface that is located at this current sensing element of pressure programming, as the outer protection material of this current sensing element, prevents aqueous vapor infiltration or scratch, and has the effect of insulation.
(glass switching temperature, Tg) between 130 to 140 ℃, the glass transition temperature of the prepreg of so-called high Tg is then between 170-180 ℃ for the glass transition temperature of general prepreg.Prepreg need consider in the lump that with the over-current protecting element pressing time curing of prepreg is temperature required, thereby the process temperatures of pressing must be greater than the about 30-50 of the glass transition temperature of prepreg ℃.Yet this high hot processing procedure will make the high molecular positive temperature coefficient material dilatancy in the current sensing element, and the surface of prepreg produces wrinkle even, and then has influence on the final size of over-current protecting element.In addition, over-current protecting element behind high hot pressing, its room temperature resistance value often bounce up to the pressing more than 1.2 times, thereby limit its range of application significantly.
In addition, the use of over-current protecting element makes the heat radiation of element become an important design consideration for adapting to the microminiaturization trend of following element design.The rate of heat dispation of traditional prepreg is about 0.3-0.5W/ ℃-m, and can't efficiently radiates heat, thereby reduces the useful life and the reliability of over-current protecting element.Therefore, if can improve the rate of heat dispation of prepreg, can make over-current protecting element have more stable performance, and can enlarge its range of application.
Summary of the invention
The purpose of this invention is to provide a kind of over-current protecting element, it can lower the resistance projectile ratio before and after the pressure programming, and the radiating efficiency of promoting element to be improving operating current, and then enlarges its range of application.
For achieving the above object, the present invention discloses a kind of over-current protecting element, it is characterized in that: it comprises:
One current sensing element, it comprises:
Two electrode foils;
One current sensing layer, it is made by the material with ptc characteristics, and is stacked between this two electrode foil;
Two insulating barriers be located at the upper and lower surface of this current sensing element respectively, and this insulating barrier have at least one following properties:
(a) glass transition temperature is between 90-120 ℃;
(b) radiating efficiency is between 1-7W/ ℃-m;
Two electrode layers are connected to the two ends of this current sensing element.
Described over-current protecting element is characterized in that: described insulating barrier is made up of a kind of material in prepreg, resin and the epoxy plastics.
Described over-current protecting element is characterized in that: described current sensing layer is formed by having the high molecular positive temperature coefficient material.
Described over-current protecting element is characterized in that: it comprises two solder mask layers in addition, is arranged at the surface of this two insulating barrier respectively.
Described over-current protecting element is characterized in that: the material of described two electrode layers is to be selected from: copper, aluminium or aluminium copper.
Described over-current protecting element is characterized in that: it comprises the two welding electrode layers that are covered in this two electrode layer surface respectively in addition, is used to prevent that this two electrode layer from directly contacting and oxidation with extraneous.
Described over-current protecting element is characterized in that: the material of described welding electrode layer is to be selected from: tin, lead or leypewter.
The present invention discloses a kind of over-current protecting element, and it comprises a current sensing element, two insulating barriers and two electrode layers.This current sensing element comprises two electrode foils and and is stacked at current sensing layer between this two electrode foil.This current sensing layer is made up of PTC material.This two insulating barrier is stacked at the upper and lower surface of this current sensing element respectively, its glass transition temperature between 90-120 ℃ or radiating efficiency between 1-7W/ ℃-m.This two electrode layer is connected to the two ends of this current sensing element.
This two electrode layer generally is made up of copper, aluminium or aluminium copper, easily oxidation.This over-current protecting element can comprise the two welding electrode layers that cover in this two electrode layer surface respectively in addition, and it is made up of leypewter that is difficult for oxidation or tin metal, can prevent that this two electrode layer from directly contacting and oxidation with extraneous.
Description of drawings
Fig. 1 is the stereogram of the over-current protecting element of first preferred embodiment of the present invention;
Fig. 2 is the profile along Fig. 1 section line 1-1 intercepting;
Fig. 3 is the schematic diagram of the over-current protecting element of second preferred embodiment of the present invention.
Component symbol explanation among the figure:
| 10,30 over-current protecting | 11,31 |
| 12,32 | 13,33 |
| 14,34 | 15,35 |
| 16,36 | |
| 37 welding electrode layers |
Embodiment
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the schematic perspective view of the over-current protecting element 10 of first preferred embodiment of the present invention, and Fig. 2 then is along the profile of 1-1 hatching among Fig. 1.This over-current protecting element 10 comprises a current sensing element 13, two insulating barriers 14, two solder resists (Solder Mask, S/M) layer 15 and two electrode layer 16.This current sensing element 13 is stacked between two electrode foils 12 by a current sensing layer 11 to be formed, and wherein this current sensing layer 11 is to adopt the high molecular positive temperature coefficient material.This insulating barrier 14 can be made up of prepreg, resin (resin) or epoxy plastics (epoxy), and its glass transition temperature is between 90-120 ℃.This two electrode layer 16 places the two ends, the left and right sides of this current sensing element 13, two insulating barriers 14 and two solder mask layers 15 respectively.
Compare with the insulating barrier of known over-current protecting element; the glass transition temperature of the insulating barrier 14 of over-current protecting element 10 of the present invention is lower; so it is less that the size that in carrying out the pressing process over-current protecting element 10 is caused changes, also can reduce the resistance projectile ratio of pressing front and back.
With reference to table one, find that by test the resistance value of over-current protecting element 10 of the present invention (insulating barrier with low glass transition temperature) is lower, that is to say the operating current that can provide bigger.
Table one
| Component size | The resistance multiple of beating before and after the over-current protecting element pressing | |
| The present invention's (90 ℃≤Tg≤120 ℃) | Known (130 ℃≤Tg≤140 ℃) | |
| ????0603 | ????1.07 | ????1.31 |
| ????0805 | ????1.01 | ????1.30 |
| ????1206 | ????1.00 | ????1.22 |
(Power Dissipation Pd) can following general formula: Pd=I for the dissipation power of over-current protecting element
2R, wherein I is an operating current, R is a resistance value.By above-mentioned general formula as can be known, dissipation power is higher, and operating current is higher.With regard to physical significance, radiating efficiency can will distribute fast because of high heat that high electric current produced preferably.That is, bigger dissipation power is equivalent to increase element at triggering (trip) preceding tolerances to electric current.Therefore, has the situation that also can be applicable to big operating current than the over-current protecting element of high cooling efficiency.
Select the insulating barrier 14 of this over-current protecting element 10 prepreg, resin or the epoxy plastics of rate of heat dispation between 1-7W/ ℃-m for use, its actual test result as shown in Table 2.As shown in Table 2, the operating current of over-current protecting element 10 of the present invention (having the insulating barrier than high cooling efficiency) and dissipation power are all than known height.
Table two
| Component size 0805 | Over-current protecting element | |
| The present invention (1-7W/ ℃-m) | Known (0.3-0.5W/ ℃-m) | |
| Resistance (ohm) | ????0.248 | ????0.245 |
| Operating current (A) | ????1.10 | ????0.95 |
| Dissipation power (W) | ????0.66 | ????0.54 |
Fig. 3 is the schematic diagram of the over-current protecting element 30 of second preferred embodiment of the present invention.This over-current protecting element 30 comprises a current sensing element 33, two insulating barriers 34, two solder mask layers 35, two electrode layers 36 and two welding electrode layers 37.This current sensing element 33 is to be stacked between two electrode foils 32 by a current sensing layer 31 to form, and wherein this current sensing layer 31 is to adopt the high molecular positive temperature coefficient material.This insulating barrier 34 can be made up of between prepreg, resin, the epoxy plastics of 1-7W/ ℃-m between 90-120 ℃ or radiating efficiency glass transition temperature.The be placed in two ends, the left and right sides of this current sensing element 33, two insulating barriers 34 and two solder mask layers 35 of this two electrode layer 36.This two welding electrodes layer 37 is covered in the surface of this electrode layer 36, is used to connect external wire (not icon).
This over-current protecting element 30 is compared with the over-current protecting element 10 of Fig. 2, is equivalent to increase on the surface of this electrode layer 36 two welding electrode layers 37.For increasing conductivity, general electrode layer 36 is made up of copper, aluminium and aluminium copper.If by these electrode layer 36 direct welding leads, will make this electrode layer 36 be exposed to the external world and oxidation may take place.Welding electrode layer 37 is made up of leypewter that is difficult for oxidation or tin, is covered in this electrode layer 36 surfaces by it, directly contacts with extraneous to prevent this electrode layer 36.
Technology contents of the present invention and technical characterstic disclose as above, yet those skilled in the art still may be based on teaching of the present invention and announcement and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications.
Claims (7)
1. over-current protecting element, it is characterized in that: it comprises:
One current sensing element, it comprises:
Two electrode foils;
One current sensing layer, it is made by the material with ptc characteristics, and is stacked between this two electrode foil;
Two insulating barriers be located at the upper and lower surface of this current sensing element respectively, and this insulating barrier have at least one following properties:
(a) glass transition temperature is between 90-120 ℃;
(b) radiating efficiency is between 1-7W/ ℃-m;
Two electrode layers are connected to the two ends of this current sensing element.
2. over-current protecting element as claimed in claim 1 is characterized in that: described insulating barrier is made up of a kind of material in prepreg, resin and the epoxy plastics.
3. over-current protecting element as claimed in claim 1 is characterized in that: described current sensing layer is formed by having the high molecular positive temperature coefficient material.
4. over-current protecting element as claimed in claim 1 is characterized in that: it comprises two solder mask layers in addition, is arranged at the surface of this two insulating barrier respectively.
5. over-current protecting element as claimed in claim 1 is characterized in that: the material of described two electrode layers is to be selected from: copper, aluminium or aluminium copper.
6. over-current protecting element as claimed in claim 1 is characterized in that: it comprises the two welding electrode layers that are covered in this two electrode layer surface respectively in addition.
7. over-current protecting element as claimed in claim 6 is characterized in that: the material of described welding electrode layer is to be selected from: tin, lead or leypewter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310120251 CN1627453A (en) | 2003-12-10 | 2003-12-10 | Over current protection element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310120251 CN1627453A (en) | 2003-12-10 | 2003-12-10 | Over current protection element |
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| Publication Number | Publication Date |
|---|---|
| CN1627453A true CN1627453A (en) | 2005-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310120251 Pending CN1627453A (en) | 2003-12-10 | 2003-12-10 | Over current protection element |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680780A (en) * | 2012-09-06 | 2014-03-26 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103714924A (en) * | 2012-09-28 | 2014-04-09 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103794304A (en) * | 2012-10-31 | 2014-05-14 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN104064296A (en) * | 2013-03-22 | 2014-09-24 | 聚鼎科技股份有限公司 | overcurrent protection element |
-
2003
- 2003-12-10 CN CN 200310120251 patent/CN1627453A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103680780A (en) * | 2012-09-06 | 2014-03-26 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| 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 |
| CN103794304A (en) * | 2012-10-31 | 2014-05-14 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN103794304B (en) * | 2012-10-31 | 2016-12-28 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| CN104064296A (en) * | 2013-03-22 | 2014-09-24 | 聚鼎科技股份有限公司 | overcurrent protection element |
| CN104064296B (en) * | 2013-03-22 | 2017-04-12 | 聚鼎科技股份有限公司 | overcurrent protection element |
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