CN2789897Y - Overcurrent protection component - Google Patents
Overcurrent protection component Download PDFInfo
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- CN2789897Y CN2789897Y CN 200520003328 CN200520003328U CN2789897Y CN 2789897 Y CN2789897 Y CN 2789897Y CN 200520003328 CN200520003328 CN 200520003328 CN 200520003328 U CN200520003328 U CN 200520003328U CN 2789897 Y CN2789897 Y CN 2789897Y
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- layer
- over
- protecting element
- insulator
- current protecting
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Abstract
The utility model discloses an overcurrent protection component, which comprises two primary electrode layers, a current detection layer and an insulator, wherein the current detection layer is made of PTC material and overlapped between the two primary electrode layers, and the insulator has a hollow structure which encircles the side edges of the current detection layer. Because the primary electrode layers are in direct contact with the current detection layer, and have larger areas than the existing electrode layers, therefore favorable heat dispersion effect can be achieved. In addition, the overcurrent protection component can also comprise two secondary electrode layers which are arranged on the surfaces of the primary electrode layers, and the areas of the secondary electrode layers are larger than that of the primary electrode layers so as to reinforce the effect of heat dispersion.
Description
Technical field
The utility model is about a kind of over-current protecting element, particularly about a kind of over-current protecting element with higher operating current.
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 portable type electronic product (for example mobile phone, mobile computer, hand camera and personal digital aid (PDA) etc.), its importance is also more and more remarkable.
General positive temperature coefficient (positive temperature coefficient, PTC) when sharp, the PTC element is when normal behaviour in service to the reacting phase of variations in temperature for the resistance value of element, and its resistance value can be kept extremely low, usually below 0.1 ohm, make circuit be able to normal operation.But, when overcurrent takes place or crosses the phenomenon of high temperature and when making temperature rise to a critical temperature, its resistance value can the moment spring to a high resistance state (for example 10
4More than the ohm) and suppress overcurrent, to reach the purpose of protection battery or circuit element.Therefore, this PTC element has been seen and has been integrated in the various circuit element, to prevent the infringement of overcurrent.
The structure of existing over-current protecting element 10 as shown in Figure 1; it is the upper and lower printed circuit laminated plates 12 of respectively putting an insulation at a positive temperature coefficient polymer 11; as the outer protection material of this positive temperature coefficient polymer 11, invade or this positive temperature coefficient polymer 11 of scratch causes component failure because of aqueous vapor preventing.Insert two electrode layers 13 at the two ends, the left and right sides of this positive temperature coefficient polymer 11 and printed circuit laminated plates 12, as the bridge of this positive temperature coefficient polymer 11 of conducting with external circuit.
This electrode layer 13 is the left and right sides that are made in this over-current protecting element 10, in order to support this positive temperature coefficient polymer 11.So; because of this printed circuit laminated plates 12 is not had a radiating effect; and this electrode layer 13 is less with the extraneous area that contacts; so can't make this over-current protecting element 10 when work, obtain good heat radiation; so that the resistance of this positive temperature coefficient polymer 11 will increase, and reduce the operating current of this over-current protecting element 10 and limit its range of application significantly.
The utility model content
The purpose of this utility model provides a kind of over-current protecting element, increases its resistance in order to prevent this over-current protecting element Yin Gaore when working, and can increase its operating current by this, and then enlarge its range of application.
For achieving the above object, the utility model discloses a kind of over-current protecting element, it is characterized in that: comprise: two-layer first electrode layer; One current sensing layer, it is made up of PTC material, and is stacked between this two-layer first electrode layer; One insulator, this insulator are hollow structures, and this insulator ring is around in this current sensing layer periphery.
Described over-current protecting element is characterized in that: the upper and lower surface of this insulator contacts this two-layer first electrode layer respectively.
Described over-current protecting element is characterized in that: this insulator is to be selected from: resin, epoxy plastics, high molecular polymer, fibre glass laminates plate or its composition.
Described over-current protecting element is characterized in that: this first electrode layer is to be selected from: aluminium, copper, silver or its alloy.
Described over-current protecting element is characterized in that: this insulator is square.
Described over-current protecting element is characterized in that: it comprises two-layer the second electrode lay in addition, is arranged at the surface of this two-layer first electrode layer respectively, and area is greater than the area of this two-layer first electrode layer.
Described over-current protecting element is characterized in that: the upper and lower surface of this insulator contacts this two-layer the second electrode lay respectively.
Described over-current protecting element is characterized in that: this second electrode lay is to be selected from: aluminium, copper, silver or its alloy.
Design the trend of microminiaturization for compliant element; over-current protecting element of the present utility model provides preferred radiator structure design and selects suitable heat sink material; can effectively avoid the resistance of this over-current protecting element to increase, use the operating current that improves overcurrent protective device.
Over-current protecting element of the present utility model, it comprises two-layer first electrode layer, a current sensing layer and an insulator.This current sensing layer is made up of PTC material, and is stacked between this two-layer first electrode layer.This insulator is the hollow structure that is surrounded on this current sensing layer side.This first electrode layer is directly to contact this current sensing layer, and because of its electrode layer compared to existing skill has bigger area, so have preferred radiating effect.
In addition, this over-current protecting element can comprise two the second electrode lays that are arranged at this first electrode layer surface in addition, and the area of this second electrode lay is greater than the area of first electrode layer, in order to strengthen radiating effect.
This insulator is except the effect with insulation, and other has the function that supports this first electrode layer or the second electrode lay.
Description of drawings
Fig. 1 is the schematic diagram of existing over-current protecting element;
Fig. 2 (a) is the schematic diagram of the over-current protecting element of first preferred embodiment of the present utility model;
Fig. 2 (b) is along the profile of 1-1 hatching among Fig. 2 (a);
Fig. 3 is the schematic diagram of the over-current protecting element of second preferred embodiment of the present utility model.
Embodiment
With reference to Fig. 2 (a), it is the schematic diagram of the over-current protecting element 20 of first preferred embodiment of the present utility model.This over-current protecting element 20 comprises a current sensing layer 21, two-layer first electrode layer 22 and an insulator 23.This current sensing layer 21 is made up of PTC material, and is stacked between this two-layer first electrode layer 22.This first electrode layer 22 can be made by copper, aluminium, silver or Al-zn-mg-cu alloy.The material of this insulator 23 can be resin (resin), epoxy resin (epoxy), high molecular polymer (polymer), printed circuit laminated plates or fibre glass laminates plate (for example FR-4) etc.This insulator 23 except function that insulation is provided, also as supporting these first electrode layer, 22 usefulness.
Fig. 2 (b) is along the profile of 1-1 hatching among Fig. 2 (a).By Fig. 2 (b) as can be known, this insulator 23 is a hollow structure, and is surrounded on the side of this current sensing layer 21.On the actual fabrication, this insulator 23 is not limited to square, and for example circular or other polygon also can be used.
With regard on the fabrication schedule, can dig out several hollow out places at a monoblock insulation board in modes such as mechanical drill, punching press (stamping) or laser hollow outs earlier, again the hollow out place is inserted the material of this current sensing layer 21.Afterwards, with this two-layer first electrode layer 22 or with mode bonding electrodes such as plating, sputter electrode in this current sensing layer 21 the surface and cut, can obtain several over-current protecting elements 20.
With reference to Fig. 3, it is the schematic diagram of the over-current protecting element 30 of second preferred embodiment of the present utility model.This over-current protecting element 30 comprises a current sensing layer 31, two-layer first electrode layer 32, an insulator 33 and two the second electrode lays 34.Over-current protecting element 20 compared to first preferred embodiment; this over-current protecting element 30 has increased the second electrode lay 34 that is arranged at these first electrode layer, 32 surfaces; and the area of this second electrode lay 34 is greater than the area of first electrode layer 32, so can increase radiating efficiency.This insulator 33 is except the function that insulation is provided, also as the usefulness that supports this second electrode lay 34.
Identical with first preferred embodiment, but also thermal diffusivities such as aluminium, copper, silver or Al-zn-mg-cu alloy are good and be easy to make the metal material of enforcement for first electrode layer 32 of present embodiment and the second electrode lay 34.
The heat conductivity of aluminium and copper metal (thermal conductivity), thermal capacity (heat capacity) and electrical conductivity (electrical conductivity) are shown in table ().Because of aluminium, copper all have good heat radiating and conductive characteristic concurrently, and silver is cheap, so aluminium, copper or its alloy (Al-zn-mg-cu alloy) are suitable as the electrode material of first electrode layer 22,32 and the second electrode lay 34 very much.
Table (one)
| Aluminium | Copper | |
| Electrical conductivity (siemens/m) thermal capacity (J/Kg ℃) heat conductivity (W/m ℃) | 0.377*106 910 160 | 0.596*106 390 200 |
Over-current protecting element 20,30 of the present utility model is because of having preferred radiating efficiency; so can avoid it when work, to cause the problem of its resistance increase, and can make over-current protecting element 20,30 have higher operating current because of the temperature rising of current sensing layer 21,31.
Technology contents of the present utility model and technical characterstic disclose as above, yet the personage who is familiar with this technology still may be based on teaching of the present utility model and announcement and done 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 those disclosed embodiments, and should comprise various do not deviate from replacement of the present utility model and modifications.
Claims (8)
1. over-current protecting element is characterized in that: comprise:
Two-layer first electrode layer;
One current sensing layer, it is made up of PTC material, and is stacked between this two-layer first electrode layer;
One insulator, this insulator are hollow structures, and this insulator ring is around in this current sensing layer periphery.
2. over-current protecting element as claimed in claim 1 is characterized in that: the upper and lower surface of this insulator contacts this two-layer first electrode layer respectively.
3. over-current protecting element as claimed in claim 1 is characterized in that: this insulator is to be selected from: resin, epoxy plastics, high molecular polymer, fibre glass laminates plate or its composition.
4. over-current protecting element as claimed in claim 1 is characterized in that: this first electrode layer is to be selected from: aluminium, copper, silver or its alloy.
5. over-current protecting element as claimed in claim 1 is characterized in that: this insulator is square.
6. over-current protecting element as claimed in claim 1 is characterized in that: it comprises two-layer the second electrode lay in addition, is arranged at the surface of this two-layer first electrode layer respectively, and area is greater than the area of this two-layer first electrode layer.
7. over-current protecting element as claimed in claim 6 is characterized in that: the upper and lower surface of this insulator contacts this two-layer the second electrode lay respectively.
8. over-current protecting element as claimed in claim 6 is characterized in that: this second electrode lay is to be selected from: aluminium, copper, silver or its alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520003328 CN2789897Y (en) | 2005-01-14 | 2005-01-14 | Overcurrent protection component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520003328 CN2789897Y (en) | 2005-01-14 | 2005-01-14 | Overcurrent protection component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2789897Y true CN2789897Y (en) | 2006-06-21 |
Family
ID=36790232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520003328 Expired - Fee Related CN2789897Y (en) | 2005-01-14 | 2005-01-14 | Overcurrent protection component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2789897Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103714924A (en) * | 2012-09-28 | 2014-04-09 | 聚鼎科技股份有限公司 | Surface-mounted overcurrent protection element |
| JP2020013812A (en) * | 2018-07-13 | 2020-01-23 | ニチコン株式会社 | PTC thermistor |
-
2005
- 2005-01-14 CN CN 200520003328 patent/CN2789897Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| JP2020013812A (en) * | 2018-07-13 | 2020-01-23 | ニチコン株式会社 | PTC thermistor |
| JP7082539B2 (en) | 2018-07-13 | 2022-06-08 | ニチコン株式会社 | PTC 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: 20060621 Termination date: 20100219 |