CN1050928C - Temp. safety device - Google Patents
Temp. safety device Download PDFInfo
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- CN1050928C CN1050928C CN 97107786 CN97107786A CN1050928C CN 1050928 C CN1050928 C CN 1050928C CN 97107786 CN97107786 CN 97107786 CN 97107786 A CN97107786 A CN 97107786A CN 1050928 C CN1050928 C CN 1050928C
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- alloy
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- fuse
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Abstract
The present invention relates to a temperature fuse which is used for circuit protection, and the temperature fuse comprises an insulating base plate, two electrodes, the connection alloy of the end heads of the two electrodes, a certain quantity of scaling powders or substances comprising the scaling powders and an outer envelope, wherein the scaling powders or the substances comprising the scaling powders can protect the flowability of liquid alloy, the outer envelope can protect the temperature fuse, and the alloy deposited on the electrodes is the same as alloy materials for connecting the end heads of the two electrodes. When certain current flows through the temperature fuse, the temperature of the base plate is increased by heat generated by a power resistor device. When the temperature reaches preset protective temperature, the connection alloy is melted, and the liquid alloy can be contracted to the two electrodes of the safety fuse because of the effect of the surface tension of the liquid alloy under the action of the scaling powders. Therefore, the fuse can be disconnected, a safety purpose is achieved, and the temperature fuse has a very high safety coefficient.
Description
The invention belongs to the circuit protection device technical field, be specifically related to a kind of temperature activation safeties that in circuit, cut off electric current with protective circuit or components and parts.
When abnormal conditions appearred in circuit, the circuit surface temperature raises more can directly reflect the intensity of anomaly of circuit than the electric current rising, and therefore, Temperature protection has more superiority than the electric current insurance.In circuit, for make circuit or element not reason abnormal conditions occur and damage, the Temperature protection of open circuit just need take a policy in circuit, U.S. Pat 5097247 discloses a kind of Temperature protection, this insurance comprise electrically insulating base, two electrodes with and on scolder, two electrode tips and be overlapped on second kind of scolder between them, wherein the melting temperature of first kind of scolder must be higher than the fusing point temperature of second kind of scolder.When insurance activates, connect two second kind of solder fusings of connection alloy material that electrode tip is used, alloy material after the fusing is owing to expand to two electrodes under the effect of the affinity of the alloy material of institute's deposit on liquid alloy and two electrodes and the electrode tip, when liquid alloy expands to a constant volume and spends, liquid alloy disconnects, and reaches the purpose that disconnects insurance.This insurance utilizes the affinity between the different materials, but the effect of affinity is very not strong, and this just influences the safety factor of safeties.
The objective of the invention is at the deficiencies in the prior art, provide a kind of using liquid surface tension effect to disconnect insurance, the Temperature protection that safety factor is higher.
The Temperature protection of design of the present invention has an insulated substrate; two independently electrodes are arranged on it; there are two electrode tips in opposite directions two electrode inboards; all be deposited with alloy material on electrode and the electrode tip; two electrode tips are also connected by alloy material; and on connecting alloy, the termination is coated with one deck protection surface-active material when connecting alloy in liquid state; electrode and electrode tip and coupling part, termination all are encapsulated with one deck insulating protective layer, and crucial part of the present invention is that the alloy of electrode tip coupling part is identical with alloy material on the dried electrode of deposit.
From physics theory as can be known different materials between the size of affinity depend on the similitude of the attribute between its material.The similitude of two kinds of materials is big more, and the affinity between the molecule of these two kinds of materials is big more.If material is identical, affinity will reach theoretic maximum limit, and affinity at this moment is at material and promptly shows as molecular surface tension force under the liquid state.The present invention is because the alloy material of deposit on electrode is identical with electrode tip connection alloy material, and the alloy that therefore connects the termination after the alloy material fusing shrinks to two electrodes rapidly owing to the effect of molecular surface tension force.Owing to make molecular surface tension force that insurance disconnects greater than the affinity between the different materials molecule that insurance is disconnected, thereby the application surface tension force this patent that disconnects insurance has higher safety factor than using the United States Patent (USP) that affinity between the molecule disconnects insurance.
The present invention will be further described below in conjunction with embodiment:
Embodiment:
Fig. 1 is the Temperature protection structural representation;
Fig. 2 is that the A-A ' of Fig. 1 is to cutaway view;
Fig. 3-8 manufactures the process schematic diagram for Temperature protection.
As shown in Figure 1, 2, this Temperature protection is two conductive electrodes of deposit (1a, 1b) on insulated substrate 7, and deposition process can be the technology of printing, sintering aspect; Electrode (1a, 1b) has two electrode tips (2a, 2b) in opposite directions, and electrode and electrode tip are deposited with alloy material layer 3, and the connecting portion 4 between the electrode tip (2a, 2b) also connects with identical alloy material.The activationary temperature of insurance is exactly the fusing point that connects two used alloy materials of electrode tip, because the different-alloy material has different fusing points, so the temperature of selecting suitable alloy material just can make arbitrary assigned temperature activates insurance.Be the reliability that guarantees disconnection, how much what connect two electrode tip alloy materials must be less than the alloy amount that can also receive behind two electrodeposition alloys.For guaranteeing that connecting two used alloy materials of electrode tip has good mobility after fusing, make liquid alloy can flow to two electrodes rapidly, at least be coated with a certain amount of liquid alloy surface that can keep on the alloy of two electric Ou Duantou strong active material 5 is arranged connecting, as scaling powder or contain the material of this class material.Be the protection Temperature protection, also on two electrodes and electrode tip and connection alloy, be coated with one deck latex or silica type material 6, with the protection Temperature protection.This Temperature protection requires to place a power device near it at protective layer in circuit; when certain electric current flow through this device, the heat that utilizes power device to produce raise the substrate temperature of Temperature protection, when temperature reaches predetermined protection temperature; connect alloy melting, disconnect.The position relation of Temperature protection and power device is decided according to the concrete condition of protective circuit, generally speaking the as close as possible Temperature protection of required power device.
Shown in Fig. 3-8, the manufacturing process of this Temperature protection is as follows:
1. on 96% alundum (Al ceramic substrate, print the palladium-silver conductor paste, so it makes the insurance electrode through sintering, electrode comprises two electrode tips in opposite directions of two electrode inboards, between the two top electrode terminations certain interval is arranged, the width in gap depends on the alloy amount that two electrodes can receive after fusing.
2. selecting Sn: Pb: Ag for use is 62: 36: 2 alloy material, adopts printing and stream mode is at insurance electrode and electrode tip weldering one deck ashbury metal again, and the thickness suggestion of ashbury metal is controlled at about 100 microns.
3. remove the impurity that in the electrodeposition alloy process, is brought, flow the remaining scaling powder in back again, can adopt cleaning method as alloy.
4. cover solder resist on electrode, all cover except that two two electric terminations, the selection of solder resist can be water cleaning, solvent clean etc.
5. still adopting Sn: Pb: Ag is 62: 36: 2 alloy material, adopts mode of printing, and its figure is overlapped on two electricity to be had on the termination, connects with stream mode more then.The alloy material of deposit also melts on electrode and the electrode tip when stream connects again, but because the effect of solder resist, the alloy after the fusing can't flow to two electrodes, thereby can not influence the connection of electrode tip.
6. the solder resist on the removal electrode.
7. to covering a certain amount of scaling powder or contain the scaling powder material on the electrode tip connection alloy, with protection liquid alloy surface activity.
8. last, electrode, electrode tip and coupling part thereof are all sealed with latex, with the protection safety structure.
Claims (2)
1. Temperature protection device; it has an insulated substrate; two independently electrodes are arranged on it; there are two electrode tips in opposite directions two electrode inboards; all be deposited with alloy material on electrode and the electrode tip; electrode tip is connected by alloy material; and on connecting alloy, the termination is coated with one deck protection surface-active material when connecting alloy in liquid state; electrode and electrode tip and coupling part, termination are encapsulated with one deck insulating protective layer, it is characterized in that the alloy of electrode tip coupling part is identical with alloy material on being deposited on electrode.
2. Temperature protection device according to claim 1 is characterized in that the optional scaling powder of the surface-active material of described protection liquid alloy or contains the material of scaling powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97107786 CN1050928C (en) | 1997-11-18 | 1997-11-18 | Temp. safety device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97107786 CN1050928C (en) | 1997-11-18 | 1997-11-18 | Temp. safety device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1189609A CN1189609A (en) | 1998-08-05 |
| CN1050928C true CN1050928C (en) | 2000-03-29 |
Family
ID=5169874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97107786 Expired - Fee Related CN1050928C (en) | 1997-11-18 | 1997-11-18 | Temp. safety device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1050928C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100444299C (en) * | 2004-07-30 | 2008-12-17 | 比亚迪股份有限公司 | Fluxing agent, and temperature fuse element of containing the fluxing agent |
| JP5807969B2 (en) * | 2012-11-07 | 2015-11-10 | エヌイーシー ショット コンポーネンツ株式会社 | Flux composition for protective element and circuit protective element using the same |
| CN111768940A (en) * | 2020-06-22 | 2020-10-13 | 兴勤（常州）电子有限公司 | Heat-preserving overvoltage protection element |
-
1997
- 1997-11-18 CN CN 97107786 patent/CN1050928C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1189609A (en) | 1998-08-05 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHONGQING CHUANYI MICROCIRCUIT CO., LTD. Free format text: FORMER NAME OR ADDRESS: NO.6 SICHUAN INSTRUMENT FACTORY |
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| CP03 | Change of name, title or address |
Address after: No. 140, Bao Shan fort, Beibei District, Chongqing Patentee after: Chongqing Sichuan Instrument Micro Ciruit Co., Ltd. Address before: Chongqing, Beibei Patentee before: Sichuan Meter Factory 6 |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |