CN102412094B - Protective circuit - Google Patents
Protective circuit Download PDFInfo
- Publication number
- CN102412094B CN102412094B CN201010290342.3A CN201010290342A CN102412094B CN 102412094 B CN102412094 B CN 102412094B CN 201010290342 A CN201010290342 A CN 201010290342A CN 102412094 B CN102412094 B CN 102412094B
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- CN
- China
- Prior art keywords
- electric conductor
- pyrocondensation
- surge absorber
- protective circuit
- switch element
- 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.)
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Abstract
The invention discloses a protective circuit. The protective circuit comprises a surge absorber, a switch element, and a thermal shrinkage element. The switch element is electrically connected with the surge absorber; the switch element is provided with a first electric conductor and a second electric conductor; and one end of the first electric conductor is provided with a first connection part and a second connection part. The thermal shrinkage element is sleeved on the external circumference of the surge absorber, and is connected to the first connection part; and the thermal shrinkage element produces shrinkage action through temperature of the surge absorber to dive the second connection part and the second electric conductor to be separated. The protective circuit achieves an open circuit state before inflaming or failure of the surge absorber.
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
In order to prevent the transient voltage surging of electric power supply system to the destruction of electronic component, usually can install sudden-wave absorbing element additional in electronic loop, surging inhales element as metal oxide varistor (Metal OxideVaristor, MOV) etc.Due to sudden-wave absorbing element in absorb surging time can produce higher heat energy, make sudden-wave absorbing element itself catch fire possibly and to arround electronic component cause damage.
Therefore, the existing practice be sudden-wave absorbing element be connected in series Thermal Cutoffs (thermal cutoff fuse) between electric power supply system, utilize Thermal Cutoffs to be heated fusing, make electronic loop and electric power supply system present off state.But, the temperature of sudden-wave absorbing element itself is in fact higher than the temperature that Thermal Cutoffs is responded to, and the useful life of sudden-wave absorbing element is limited, therefore, still likely there is sudden-wave absorbing element first to catch fire, the situation that Thermal Cutoffs fuses again, or, catching fire of sudden-wave absorbing element occurs with the fusing of Thermal Cutoffs simultaneously, then the electronic component arround still has the anxiety of damage.
Summary of the invention
The object of the invention is to provide a kind of protective circuit, on surge absorber, sheathed pyrocondensation element, utilizes the temperature of surge absorber itself, makes pyrocondensation element produce contraction, whereby, reaches the off state of protective circuit with driving switch element.
The technological means that the present invention takes is a kind of protective circuit, comprising:
One surge absorber;
One switch element, is electrically connected with this surge absorber, and this switch element has one first electric conductor and one second electric conductor, and one 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 to this first connecting portion, and this pyrocondensation element produces contraction by the temperature of this surge absorber; Wherein, when this switch element is positioned at initial condition, this second connecting portion is in electrical contact in this second electric conductor; When the shrinkage degree of this pyrocondensation element is enough to drive this second connecting portion to be separated with this second electric conductor, this switch element reaches off state.
Another technological means that the present invention takes is a kind of protective circuit, comprising:
One surge absorber;
One switch element, is electrically connected 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, this surge absorber sheathed, this switch element and this block, this pyrocondensation element produces contraction by the temperature of this surge absorber; Wherein, this pyrocondensation element produces contraction in an operating temperature range, to drive this block to move between this first electric conductor and this second electric conductor, makes this switch element reach off state.
Beneficial effect of the present invention is; in the operating temperature range of pyrocondensation element; 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 or first reaches off state before inefficacy.
Beneficial effect of the present invention is also, can not reply after pyrocondensation component shrinkage, switch element can be made to continue to remain on off state, to guarantee fail safe.
About the detailed description of technological means of the present invention, refer to following execution mode, and coordinate appended accompanying drawing reference in the lump.
Accompanying drawing explanation
Fig. 1: the circuit block diagram of an embodiment of protective circuit of the present invention;
Fig. 2 A-Fig. 2 B: the schematic diagram of the 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 schematic diagram of the first embodiment of the switch element of protective circuit of the present invention;
Fig. 4 B: the schematic diagram of the second embodiment of the switch element of protective circuit of the present invention;
Fig. 4 C: the schematic diagram 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 the second embodiment of protective circuit of the present invention; And
Fig. 6 A-Fig. 6 B: the stereogram of the second embodiment of protective circuit of the present invention.
Wherein, description of reference numerals is as follows:
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 ": the first connecting portion
1413,1413 ', 1413 ": the 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 shows 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 surge absorber 12 and a switch element 14, and wherein, switch element 14 and a power supply 11 are electrically connected; Surge absorber 12 is electrically connected with switch element 14 and electronic component 16 respectively, forms an electronic loop 1 by above-mentioned annexation.Above-mentioned protective circuit 10 is only with the annexation of electronic component 16 and illustrates, 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 sudden-wave absorbing element, this sudden-wave absorbing element can be metal oxide varistor (Metal Oxide Varistor, MOV), and metal oxide varistor can be the nonlinear resistance of zinc oxide or other metal oxides etc.If when surge absorber 12 comprises multiple sudden-wave absorbing element; multiple sudden-wave absorbing element can be contacted mutually each other, in parallel or both modes of mixing connect; when one of them sudden-wave absorbing element receives surging; this sudden-wave absorbing element just can be in a short-circuit condition; to provide the path of a shunting; to protect electronic component 16 not affect by surging, meanwhile, the temperature of surge absorber 12 is along with rising.
How reaching above-mentioned effect to describe protective circuit 10 particularly, please refer to Fig. 2 A, is the schematic diagram of the first embodiment of a kind of protective circuit of the present invention.As shown in Figure 2 A, the surge absorber 12 of protective circuit 10 and switch element 14 to be all arranged on circuit substrate 19 and 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 in the mode of collar around surge absorber 12, utilize the temperature of surge absorber 12 itself, make pyrocondensation element 18 produce contraction.Pyrocondensation element 18 also can have multiple air-vent (not shown), to increase the heat radiation of surge absorber 12.The material of pyrocondensation element 18 can be the insulation such as polyester or polyvinyl chloride and nonflammable material; when the temperature of surge absorber 12 itself is when 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 or first reach off state before inefficacy.
That enumerates description operation temperature range selects mode; please refer to Fig. 3; for the performance diagram of an embodiment of the pyrocondensation element of protective circuit of the present invention, the operating temperature range of pyrocondensation element 18 is selected to be more than or equal to the temperature range [T corresponding to default shrinkage x% in shrinkage
1, T
2], this shrinkage can be the lateral shrinkage (Transverse Shrinkage Rate) of pyrocondensation element 18.The account form of shrinkage is enumerated as shown in formula (1).
Wherein, S represents the shrinkage of pyrocondensation element 18, L
0represent the perisystolic lateral length of pyrocondensation element 18, L represents the lateral length after pyrocondensation element 18 contraction.
When it should be noted that protective circuit 10 of the present invention is dispatched from the factory, pyrocondensation element 18 can utilize the modes such as coated or viscose glue to be fixed on surge absorber 12 around.When protective circuit 10 uses, switch element 14 to shrink with pyrocondensation element 18 and switches to open circuit.Owing to can not reply after pyrocondensation element 18 contraction, therefore, also can not reply after switch element 14 open circuit, catch fire to prevent surge absorber 12 persistently overheating, reach the effect of safety utilization of electric power.
In the present embodiment, the material of pyrocondensation element 18 can select its operating temperature range [T
1, T
2] maximum temperature be surge absorber 12 lost efficacy critical temperature, its role is to, pyrocondensation element 18 significantly can shrink before surge absorber 12 loses efficacy, and made switch element 14 open circuit, damaged to prevent surge absorber 12 temperature too high.For example, the critical temperature that surge absorber 12 lost efficacy is 150 DEG C, then operating temperature range [the T of pyrocondensation element 18
1, T
2] can be 125 DEG C to 150 DEG C, at 125 DEG C in 145 DEG C, its shrinkage reaches 40% to 60%, then pyrocondensation element 18 significantly shrank before surge absorber 12 loses efficacy, and driving switch element 14 reaches off state.
As shown in Figure 2 A, switch element 14 can comprise one first electric conductor 141 and one second electric conductor 143.When switch element 14 is positioned at initial condition, the first electric conductor 141 by a contact point 145 and the second electric conductor 143 in electrical contact.Wherein, contact point 145 can be the gold goal, ping-pong ball or the tin ball that are welded on the first electric conductor 141 or the second electric conductor 143, and in addition, contact point 145 also can be take shape in the protuberance on the first electric conductor 141 or the second electric conductor 143.As shown in Figure 2 B, when the shrinkage degree of pyrocondensation element 18 be enough to driving first electric conductor 141 be separated with the second electric conductor 143 time, then switch element 14 reaches off state.
Please refer to Fig. 4 A, is the schematic diagram of the first embodiment of the switch element of protective circuit of the present invention.As shown in Figure 4 A, first electric conductor 141a one end in switch element 14a has a fluting 1415, has a contact point 145a with the one end forming the first connecting portion 1411 and the second connecting portion 1413, second electric conductor 143a.During actual enforcement, contact point 145a also can be arranged on the second connecting portion 1413.
In the present embodiment, the first connecting portion 1411 is an extension, and the second connecting portion 1413 is a base portion.Wherein, first connecting portion 1411 is fixed on the outer surface of pyrocondensation element 18 by 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, then first connecting portion 1411 of pyrocondensation element 18 simultaneously collar surge absorber 12 and the first electric conductor 141a.Whereby, first connecting portion 1411 will be subject to the traction of pyrocondensation element 18, when the shrinkage degree of pyrocondensation element 18 is enough to make one end of the first electric conductor 141a to produce bending phenomenon, the second connecting portion 1413 is separated with the second electric conductor 143a, then switch element 14a reaches off state.
Please refer to Fig. 4 B, is the schematic diagram of the second embodiment of the switch element of protective circuit of the present invention.As shown in Figure 4 B, switch element 14b is roughly the same with the first embodiment, and one end of the first electric conductor 141b has a fluting 1415 ' equally.Its difference is, first connecting portion 1411 ' of the first electric conductor 141b is a base portion, and the second connecting portion 1413 ' is an extension.In addition, one end of the second electric conductor 143b has a contact point 145b, and during actual enforcement, contact point 145b also can be arranged on the second connecting portion 1413 '.First electric conductor 141b is identical with the first embodiment with the separation principle of the second electric conductor 143b.
Please refer to Fig. 4 C, is the schematic diagram of the 3rd embodiment of the switch element of protective circuit of the present invention.As shown in Figure 4 C, switch element 14c is roughly the same with the first embodiment, its difference is, the fluting 1415 of the first electric conductor 141c " direction 115 different from fluting, make the first connecting portion 1411 and " inner side of pyrocondensation element 18 can be extended into by the top of pyrocondensation element 18.And the second connecting portion 1413 is " identical with the first embodiment with the separation principle of the second electric conductor 143c.
In addition, please refer to Fig. 5 A-Fig. 5 B, is the vertical view of the second embodiment of protective circuit of the present invention, and is the stereogram of the second embodiment of protective circuit of the present invention with reference to figure 6A-Fig. 6 B simultaneously.As shown in Figure 5A, the difference of the protective circuit 10 of protective circuit 20 and the first embodiment is, protective circuit 20 also comprises a block 25, and pyrocondensation element 28 is centered around surge absorber 22, switch element 24 and block 25 around.
In the present embodiment, the material of block 25 is an insulating material, and block 25 is arranged in circuit substrate (not shown) movably, and surge absorber 22 and switch element 24 are also arranged on circuit substrate, and are electrically connected mutually.Switch element 24 comprises one first electric conductor 241 and is provided with a contact point 245 between one second electric conductor 243, first electric conductor 241 and the second electric conductor 243.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 does not reach the minimum temperature in operating temperature range, the first electric conductor 241 and the second electric conductor 243 are connected to each other by contact point 245, and as shown in Fig. 5 A and Fig. 6 A, namely switch element 24 operates in conducting state.When surge absorber 22 receives a surging, the temperature of surge absorber 22 raises gradually, and pyrocondensation element 28 heats up because of heat transfer simultaneously, and when temperature reaches the operating temperature range of pyrocondensation element 28, pyrocondensation element 28 produces contraction.Simultaneously, block 25 is subject to active force when pyrocondensation element 28 shrinks and moves towards contact point 245 and enter between the first electric conductor 241 and the second electric conductor 243, with isolated electric connection between first electric conductor 241 and the second electric conductor 243, as shown in Fig. 5 B and Fig. 6 B, then switch element 24 operates in off state.
As described above; be only preferred embodiment of the present invention; when not limiting scope of the invention process with this, the simple equivalence namely generally done according to the present patent application protection range and invention description content changes and modifies, and all still remains within the scope of the patent.
Claims (16)
1. a protective circuit, is characterized in that, comprising:
One surge absorber;
One switch element, is electrically connected with this surge absorber, and this switch element has one first electric conductor and one second electric conductor, and one 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 to this first connecting portion, and this pyrocondensation element produces contraction by the temperature of this surge absorber; Wherein, when this switch element is positioned at initial condition, this second connecting portion is in electrical contact in this second electric conductor; When the shrinkage degree of this pyrocondensation element is enough to drive this second connecting portion to be separated with this second electric conductor, this switch element reaches off state.
2. protective circuit as claimed in claim 1, it is characterized in that, this first connecting portion is an extension, and this second connecting portion is a base portion.
3. protective circuit as claimed in claim 1, it is characterized in that, this first connecting portion is a base portion, and this second connecting portion is an extension.
4. protective circuit as claimed in claim 1, it is characterized in that, this first connecting portion is connected with the outer surface of this pyrocondensation element.
5. protective circuit as claimed in claim 1, it is characterized in that, this first connecting portion is between this pyrocondensation element and this surge absorber.
6. protective circuit as claimed in claim 1, it is characterized in that, this protective circuit also comprises a contact point and is arranged on the second connecting portion of this first electric conductor, and this first electric conductor is connected with this second electric conductor by this contact point.
7. protective circuit as claimed in claim 1, it is characterized in that, this protective circuit also comprises a contact point and is arranged on this second electric conductor, and this second electric conductor is connected with the second connecting portion of this first electric conductor by this contact point.
8. protective circuit as claimed in claim 1, it is characterized in that, this pyrocondensation element is a heat-shrinkable T bush, and the material of this heat-shrinkable T bush is polyester or polyvinyl chloride.
9. protective circuit as claimed in claim 1, it is characterized in that, this pyrocondensation element has multiple air-vent.
10. protective circuit as claimed in claim 1, it is characterized in that, this pyrocondensation element is fixed on the outer surface of this surge absorber with viscose glue.
11. protective circuits as claimed in claim 1; it is characterized in that; when the temperature of this pyrocondensation element is in an operating temperature range, this pyrocondensation element has one and presets shrinkage, and the maximum temperature of this operating temperature range is the critical temperature that this surge absorber lost efficacy.
12. 1 kinds of protective circuits, is characterized in that, comprising:
One surge absorber;
One switch element, is electrically connected 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, this surge absorber sheathed, this switch element and this block, this pyrocondensation element produces contraction by the temperature of this surge absorber; Wherein, this pyrocondensation element produces contraction in an operating temperature range, to drive this block to move between this first electric conductor and this second electric conductor, makes this switch element reach off state.
13. protective circuits as claimed in claim 12, is characterized in that, the maximum temperature of this operating temperature range is the critical temperature that this surge absorber lost efficacy.
14. protective circuits as claimed in claim 12, is characterized in that, the material of this block is an insulating material.
15. 1 kinds of protective circuits, is characterized in that, comprising:
One surge absorber;
One switch element, is electrically connected with this surge absorber, and this switch element has one first electric conductor and one second electric conductor; And
One pyrocondensation element, is sheathed on the outside of this surge absorber, and is connected to this first electric conductor, and this pyrocondensation element produces contraction by the temperature of this surge absorber; Wherein, when this switch element is positioned at initial condition, this first electric conductor is in electrical contact in this second electric conductor; When the shrinkage degree of this pyrocondensation element is enough to drive this first electric conductor to be separated with this second electric conductor, this switch element reaches off state.
16. protective circuits as claimed in claim 15; it is characterized in that; this pyrocondensation element is a heat-shrinkable T bush, and the material of this heat-shrinkable T bush is polyester or polyvinyl chloride, and the maximum temperature of the operating temperature range of this pyrocondensation element is the critical temperature that this surge absorber lost efficacy.
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 CN102412094A (en) | 2012-04-11 |
| CN102412094B true 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) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047891A (en) * | 1990-07-18 | 1991-09-10 | Idsi Products Of Georgia | Surge arrester core |
| 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 hot protection function |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3279970D1 (en) * | 1981-04-02 | 1989-11-09 | Raychem Corp | Radiation cross-linking of ptc conductive polymers |
| 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 |
| JP2512887B2 (en) * | 1991-09-17 | 1996-07-03 | 三菱マテリアル株式会社 | Serge absorber |
| KR100899282B1 (en) * | 2006-07-18 | 2009-05-27 | 주식회사 엘지화학 | 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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5047891A (en) * | 1990-07-18 | 1991-09-10 | Idsi Products Of Georgia | Surge arrester core |
| 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 hot protection function |
Non-Patent Citations (2)
| Title |
|---|
| JP平4-053101A 1992.02.20 * |
| JP特开平4-217813A 1992.08.07 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102412094A (en) | 2012-04-11 |
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