CN102412094A - Protective circuit - Google Patents
Protective circuit Download PDFInfo
- Publication number
- CN102412094A CN102412094A CN2010102903423A CN201010290342A CN102412094A CN 102412094 A CN102412094 A CN 102412094A CN 2010102903423 A CN2010102903423 A CN 2010102903423A CN 201010290342 A CN201010290342 A CN 201010290342A CN 102412094 A CN102412094 A CN 102412094A
- Authority
- CN
- China
- Prior art keywords
- conductor
- heat
- surge absorber
- shrinkable
- protection circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001681 protective effect Effects 0.000 title claims description 39
- 239000006096 absorbing agent Substances 0.000 claims abstract description 75
- 239000004020 conductor Substances 0.000 claims abstract description 75
- 239000000463 material Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 3
- 229920000728 polyester Polymers 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 2
- 230000001595 contractor effect Effects 0.000 claims 1
- 238000009423 ventilation Methods 0.000 claims 1
- 230000008602 contraction Effects 0.000 description 9
- 229910044991 metal oxide Inorganic materials 0.000 description 5
- 150000004706 metal oxides Chemical class 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 230000006378 damage Effects 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Images
Landscapes
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a protection circuit, which comprises a surge absorber, a switch element and a heat shrinkage element. The switch element is electrically connected with the surge absorber, the switch element is provided with a first conductor and a second conductor, and one end of the first conductor is provided with a first connecting part and a second connecting part. The heat-shrinkable element is sleeved on the outer periphery of the surge absorber and connected to the first connecting part, and the heat-shrinkable element generates a shrinking action through the temperature of the surge absorber so as to drive the second connecting part to be separated from the second conductor. The protection circuit of the invention achieves the open circuit state before the surge absorber catches fire or fails.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly reach the protective circuit of off state with the contraction of pyrocondensation element.
Background technology
For the transient voltage surging that prevents electric power supply system destruction to electronic component, can in electronic loop, install the surging absorber element additional usually, surging inhale element such as metal oxide varistor (Metal OxideVaristor, MOV) etc.Because the surging absorber element can produce higher heat energy when absorbing surging, the surging absorber element itself is caught fire and to arround electronic component cause damage.
Therefore, the existing practice is between surging absorber element and electric power supply system, to be connected in series Thermal Cutoffs (thermal cutoff fuse), utilizes Thermal Cutoffs to receive thermal cut, makes electronic loop and electric power supply system present off state.Yet in fact the temperature of surging absorber element itself is higher than the temperature that Thermal Cutoffs is responded to, and the useful life of surging absorber element is limited; Therefore; The surging absorber element still might take place to catch fire earlier, the situation that Thermal Cutoffs fuses again, perhaps; The fusing of catching fire with Thermal Cutoffs of surging absorber element takes place simultaneously, and the electronic component arround then still has the anxiety of damage.
Summary of the invention
The objective of the invention is for a kind of protective circuit is provided, sheathed pyrocondensation element on surge absorber utilizes the temperature of surge absorber itself, makes the pyrocondensation element produce contraction, whereby, reaches the off state of protective circuit with driving switch element.
The technological means that the present invention taked is a kind of protective circuit, comprising:
One surge absorber;
One switch element electrically connects with this surge absorber, and this switch element has one first electric conductor and one second electric conductor, and an end of this first electric conductor has one first connecting portion and one second connecting portion; And
One pyrocondensation element is sheathed on the outside of this surge absorber, and is connected in this first connecting portion, and this pyrocondensation element produces contraction through the temperature of this surge absorber; Wherein, when this switch element was positioned at initial condition, this second connecting portion electrically was contacted with this second electric conductor; When the shrinkage degree of this pyrocondensation element was enough to drive this second connecting portion and separates with this second electric conductor, this switch element was reached off state.
Another technological means that the present invention taked is a kind of protective circuit, comprising:
One surge absorber;
One switch element electrically connects with this surge absorber, and this switch element has one first electric conductor and one second electric conductor, and this first electric conductor is connected with this second electric conductor separably;
One block is adjacent with this switch element; And
One pyrocondensation element, sheathed this surge absorber, this switch element and this block, this pyrocondensation element produces contraction through the temperature of this surge absorber; Wherein, this pyrocondensation element is in an operating temperature range, to produce contraction, moves between this first electric conductor and this second electric conductor to drive this block, makes this switch element reach off state.
Beneficial effect of the present invention is; In the operating temperature range of pyrocondensation element; The pyrocondensation element can produce contraction according to the actual temperature of surge absorber, with driving switch element, makes protective circuit before surge absorber catches fire preceding or lost efficacy, reach off state earlier.
Beneficial effect of the present invention also is, can not reply after the pyrocondensation component shrinkage, can make switch element continue to remain on off state, to guarantee fail safe.
About the detailed description of technological means of the present invention, see also following execution mode, and cooperate the reference in the lump of appended accompanying drawing.
Description of drawings
Fig. 1: the circuit block diagram of an embodiment of protective circuit of the present invention;
Fig. 2 A-Fig. 2 B: the sketch map of first embodiment of protective circuit of the present invention;
Fig. 3: the performance diagram of an embodiment of the pyrocondensation element of protective circuit of the present invention;
Fig. 4 A: the sketch map of first embodiment of the switch element of protective circuit of the present invention;
Fig. 4 B: the sketch map of second embodiment of the switch element of protective circuit of the present invention;
Fig. 4 C: the sketch map of the 3rd embodiment of the switch element of protective circuit of the present invention;
Fig. 5 A-Fig. 5 B: the vertical view of second embodiment of protective circuit of the present invention; And
Fig. 6 A-Fig. 6 B: the stereogram of second embodiment of protective circuit of the present invention.
Wherein, description of reference numerals is following:
1: electronic loop
11: power supply
10,20: protective circuit
12: surge absorber
14,14a, 14b, 14c: switch element
141,141a, 141b, 141c, 241: the first electric conductors
1411,1411 ', 1411 ": first connecting portion
1413,1413 ', 1413 ": second connecting portion
1415,1415 ', 1415 ": fluting
143,143a, 143b, 143c, 243: the second electric conductors
145,145a, 145b, 245: contact point
16: electronic component
18,28: insulation component
19: circuit substrate
25: block
251: protuberance
T
1, T
2: temperature
X: preset shrinkage
Embodiment
Fig. 1 has shown the circuit block diagram of an embodiment of a kind of protective circuit of the present invention.As shown in Figure 1, protective circuit 10 comprises a surge absorber 12 and a switch element 14, and wherein, a switch element 14 and a power supply 11 electrically connect; Surge absorber 12 electrically connects with switch element 14 and electronic component 16 respectively, forms an electronic loop 1 through above-mentioned annexation.The annexation of above-mentioned protective circuit 10 and electronic component 16 is merely and illustrates, and protective circuit 10 of the present invention also can be applicable to socket device or electrical installation.
In the present embodiment; Surge absorber 12 can comprise at least one surging absorber element; This surging absorber element can be metal oxide varistor, and (Metal Oxide Varistor, MOV), metal oxide varistor can be the nonlinear resistance of zinc oxide or other metal oxides etc.When if surge absorber 12 comprises a plurality of surging absorber element; A plurality of surging absorber elements can be contacted mutually each other, mode parallelly connected or that both mix connects, and when one of them surging absorber element received surging, this surging absorber element just can be in a short-circuit condition; So that the path of a shunting to be provided; Not influenced by surging with protection electronic component 16, simultaneously, the temperature of surge absorber 12 is along with rising.
How to reach above-mentioned effect in order to describe protective circuit 10 particularly, please refer to Fig. 2 A, be the sketch map of first embodiment of a kind of protective circuit of the present invention.Shown in Fig. 2 A, the surge absorber 12 of protective circuit 10 and switch element 14 all are arranged on the circuit substrate 19 and are contiguous mutually.
In the present embodiment; The body of surge absorber 12 can be circular plate type, strip or annular; The outside of surge absorber 12 is provided with a pyrocondensation element 18; Pyrocondensation element 18 around surge absorber 12, utilizes the temperature of surge absorber 12 itself with the mode of collar, makes pyrocondensation element 18 produce contractions.Pyrocondensation element 18 also can have a plurality of air-vent (not shown)s, to increase the heat radiation of surge absorber 12.The material of pyrocondensation element 18 can be insulation and nonflammable materials such as polyester or polyvinyl chloride; When the temperature of surge absorber 12 itself during between the operating temperature range of pyrocondensation element 18; Pyrocondensation element 18 can produce contraction according to the actual temperature of surge absorber 12; With driving switch element 14, make protective circuit 10 before surge absorber 12 catches fire preceding or lost efficacy, reach off state earlier.
Enumerate the mode of selecting for use of description operation temperature range; Please refer to Fig. 3; Be the performance diagram of an embodiment of the pyrocondensation element of protective circuit of the present invention, the operating temperature range of selecting pyrocondensation element 18 for use in shrinkage more than or equal to the pairing temperature range [T of preset shrinkage x%
1, T
2], this shrinkage can be the lateral shrinkage (Transverse Shrinkage Rate) of pyrocondensation element 18.The account form of shrinkage is enumerated shown in formula (1).
Wherein, S represents the shrinkage of pyrocondensation element 18, L
0 Represent pyrocondensation element 18 perisystolic lateral lengths, L represents the lateral length after pyrocondensation element 18 shrinks.
It should be noted that when protective circuit 10 of the present invention is dispatched from the factory, pyrocondensation element 18 can utilize coat or modes such as viscose glue be fixed on surge absorber 12 around.When protective circuit 10 was used, switch element 14 can shrink to switch to and open circuit with pyrocondensation element 18.Because pyrocondensation element 18 can not be replied after shrinking, therefore, after opening circuit, switch element 14 also can not reply, catch fire to prevent that surge absorber 12 is persistently overheating, reach the effect of safety utilization of electric power.
In the present embodiment, the material of pyrocondensation element 18 can be selected its operating temperature range [T
1, T
2] maximum temperature be the critical temperature that surge absorber 12 lost efficacy, its role is to, pyrocondensation element 18 can significantly shrink before surge absorber 12 loses efficacy, and switch element 14 is opened circuit, and damaged to prevent that surge absorber 12 temperature are too high.For instance, the critical temperature that surge absorber 12 lost efficacy is 150 ℃, then operating temperature range [the T of pyrocondensation element 18
1, T
2] can be 125 ℃ to 150 ℃, 125 ℃ in 145 ℃, its shrinkage has reached 40% to 60%, then pyrocondensation element 18 significantly shrank before surge absorber 12 loses efficacy, and driving switch element 14 is reached off state.
Shown in Fig. 2 A, switch element 14 can comprise one first electric conductor 141 and one second electric conductor 143.When switch element 14 was positioned at initial condition, first electric conductor 141 electrically contacted with second electric conductor 143 through a contact point 145.Wherein, contact point 145 can be the gold goal, ping-pong ball or the tin ball that are welded on first electric conductor 141 or second electric conductor 143, and in addition, contact point 145 also can be the protuberance that takes shape on first electric conductor 141 or second electric conductor 143.Shown in Fig. 2 B, when the shrinkage degree of pyrocondensation element 18 was enough to drive first electric conductor 141 and separates with second electric conductor 143, then switch element 14 was reached off state.
Please refer to Fig. 4 A, be the sketch map of first embodiment of the switch element of protective circuit of the present invention.Shown in Fig. 4 A, the first electric conductor 141a, one end among the switch element 14a has a fluting 1415, has a contact point 145a with an end that forms first connecting portion 1411 and second connecting portion, 1413, the second electric conductor 143a.During actual enforcement, contact point 145a also can be arranged on second connecting portion 1413.
In the present embodiment, first connecting portion 1411 is an extension, and second connecting portion 1413 is a base portion.Wherein, First connecting portion 1411 can be fixed on the outer surface of pyrocondensation element 18 through viscose glue; Or be arranged at the inner surface of pyrocondensation element 18, and if be arranged at the inner surface of pyrocondensation element 18, pyrocondensation element 18 first connecting portion 1411 of collar surge absorber 12 and the first electric conductor 141a simultaneously then.Whereby; First connecting portion 1411 will receive the traction of pyrocondensation element 18; When the shrinkage degree of pyrocondensation element 18 was enough to make the end generation bending phenomenon of the first electric conductor 141a, second connecting portion 1413 separated with the second electric conductor 143a, and then switch element 14a reaches off state.
Please refer to Fig. 4 B, be the sketch map of second embodiment of the switch element of protective circuit of the present invention.Shown in Fig. 4 B, the switch element 14b and first embodiment are roughly the same, the end of the first electric conductor 141b have equally one the fluting 1415 '.Its difference is, first connecting portion 1411 of the first electric conductor 141b ' and be a base portion, and second connecting portion 1413 ' be an extension.In addition, the end of the second electric conductor 143b has a contact point 145b, during actual enforcement, contact point 145b also can be arranged on second connecting portion 1413 '.The first electric conductor 141b is identical with first embodiment with the separation principle of the second electric conductor 143b.
Please refer to Fig. 4 C, be the sketch map of the 3rd embodiment of the switch element of protective circuit of the present invention.Shown in Fig. 4 C; The switch element 14c and first embodiment are roughly the same; Its difference is, the fluting 1415 of the first electric conductor 141c " direction 115 different with fluting, make first connecting portion 1411 and " can extend into the inboard of pyrocondensation element 18 by the top of pyrocondensation element 18.And second connecting portion 1413 is " identical with first embodiment with the separation principle of the second electric conductor 143c.
In addition, please refer to Fig. 5 A-Fig. 5 B, be the vertical view of second embodiment of protective circuit of the present invention, and be the stereogram of second embodiment of protective circuit of the present invention with reference to figure 6A-Fig. 6 B simultaneously.Shown in Fig. 5 A, the difference of the protective circuit 10 of the protective circuit 20 and first embodiment is that protective circuit 20 also comprises a block 25, and pyrocondensation element 28 is centered around around surge absorber 22, switch element 24 and the block 25.
In the present embodiment, the material of block 25 is an insulating material, and block 25 is arranged on the circuit substrate (not shown) movably, and surge absorber 22 and switch element 24 also are arranged on the circuit substrate, and electrically connects mutually.Switch element 24 comprises between one first electric conductor 241 and one second electric conductor, 243, the first electric conductors 241 and second electric conductor 243 and is provided with a contact point 245.During actual enforcement, block 25 can have a protuberance 251, and protuberance 251 is adjacent with contact point 245, and the size of protuberance 251 is greater than the size of contact point 245.
When the temperature of pyrocondensation element 28 did not reach the minimum temperature in the operating temperature range, first electric conductor 241 was connected mutually through contact point 245 with second electric conductor 243, and shown in Fig. 5 A and Fig. 6 A, promptly switch element 24 operates in conducting state.When surge absorber 22 received a surging, the temperature of surge absorber 22 raise gradually, and pyrocondensation element 28 heats up because of heat conduction simultaneously, and temperature is when reaching the operating temperature range of pyrocondensation element 28, and pyrocondensation element 28 produces contractions.Simultaneously; Active force when block 25 receives pyrocondensation element 28 and shrinks and move and get between first electric conductor 241 and second electric conductor 243 towards contact point 245; With the electric connection between isolated first electric conductor 241 and second electric conductor 243; Shown in Fig. 5 B and Fig. 6 B, then switch element 24 operates in off state.
The above person; Be merely preferred embodiment of the present invention; When not limiting the scope that the present invention implements with this, the simple equivalent of promptly doing according to application protection range of the present invention and invention description generally changes and modifies, and all still belongs in the scope that patent of the present invention contains.
Claims (16)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010290342.3A CN102412094B (en) | 2010-09-20 | 2010-09-20 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010290342.3A CN102412094B (en) | 2010-09-20 | 2010-09-20 | Protective circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102412094A true CN102412094A (en) | 2012-04-11 |
| CN102412094B CN102412094B (en) | 2014-12-31 |
Family
ID=45914119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010290342.3A Expired - Fee Related CN102412094B (en) | 2010-09-20 | 2010-09-20 | Protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102412094B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134577A (en) * | 2014-06-25 | 2014-11-05 | 上海神沃电子有限公司 | Thermoelectric protective element resistant to slight shock |
| CN109801811A (en) * | 2019-03-19 | 2019-05-24 | 广州安的电子技术有限公司 | Temperature switch |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047891A (en) * | 1990-07-18 | 1991-09-10 | Idsi Products Of Georgia | Surge arrester core |
| JPH0453101A (en) * | 1990-06-18 | 1992-02-20 | Matsushita Electric Ind Co Ltd | Surge absorber with safety function |
| JPH04217813A (en) * | 1990-12-19 | 1992-08-07 | Matsushita Electric Ind Co Ltd | Surge absorber provided with security function |
| JPH053101A (en) * | 1981-04-02 | 1993-01-08 | Raychem Corp | Electric device |
| TW199230B (en) * | 1991-09-17 | 1993-02-01 | Mitsubishi Sogo Zairyo Kk | |
| US6281780B1 (en) * | 1999-04-28 | 2001-08-28 | Texas Instruments Incorporated | Electrical apparatus having improved electrical contact and electrical contact used therewith |
| CN101202137A (en) * | 2006-12-15 | 2008-06-18 | 兴勤电子工业股份有限公司 | Voltage dependent resistor with thermal protection function |
| CN101517781A (en) * | 2006-07-18 | 2009-08-26 | 株式会社Lg化学 | Safety switch using heat shrinkage tube and secondary battery including the same |
-
2010
- 2010-09-20 CN CN201010290342.3A patent/CN102412094B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH053101A (en) * | 1981-04-02 | 1993-01-08 | Raychem Corp | Electric device |
| JPH0453101A (en) * | 1990-06-18 | 1992-02-20 | Matsushita Electric Ind Co Ltd | Surge absorber with safety function |
| US5047891A (en) * | 1990-07-18 | 1991-09-10 | Idsi Products Of Georgia | Surge arrester core |
| JPH04217813A (en) * | 1990-12-19 | 1992-08-07 | Matsushita Electric Ind Co Ltd | Surge absorber provided with security function |
| TW199230B (en) * | 1991-09-17 | 1993-02-01 | Mitsubishi Sogo Zairyo Kk | |
| US6281780B1 (en) * | 1999-04-28 | 2001-08-28 | Texas Instruments Incorporated | Electrical apparatus having improved electrical contact and electrical contact used therewith |
| CN101517781A (en) * | 2006-07-18 | 2009-08-26 | 株式会社Lg化学 | Safety switch using heat shrinkage tube and secondary battery including the same |
| CN101202137A (en) * | 2006-12-15 | 2008-06-18 | 兴勤电子工业股份有限公司 | Voltage dependent resistor with thermal protection function |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134577A (en) * | 2014-06-25 | 2014-11-05 | 上海神沃电子有限公司 | Thermoelectric protective element resistant to slight shock |
| CN104134577B (en) * | 2014-06-25 | 2016-04-20 | 上海神沃电子有限公司 | The thermoelectricity protection component of anti-microseism |
| CN109801811A (en) * | 2019-03-19 | 2019-05-24 | 广州安的电子技术有限公司 | Temperature switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102412094B (en) | 2014-12-31 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
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Granted publication date: 20141231 Termination date: 20200920 |