CN101388305B - Circuit protecting element and circuit board having the circuit protecting element - Google Patents
Circuit protecting element and circuit board having the circuit protecting element Download PDFInfo
- Publication number
- CN101388305B CN101388305B CN2007101538897A CN200710153889A CN101388305B CN 101388305 B CN101388305 B CN 101388305B CN 2007101538897 A CN2007101538897 A CN 2007101538897A CN 200710153889 A CN200710153889 A CN 200710153889A CN 101388305 B CN101388305 B CN 101388305B
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- China
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- circuit
- circuit board
- metal base
- protecting element
- bimetal leaf
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Abstract
The invention relates to a circuit protection element and a circuit board with the circuit protection element, wherein the circuit protection element comprises a metal basal portion and at least a slot which is opened in the metal basal portion, thereby making the metal basal portion become a positioning portion with elasticity, wherein one end of the metal basal portion is fixedly combined in a circuit board, the bottom of the free end of the metal basal portion is contacted with a conductive point arranged by the circuit board in order to keep the power-on state of a circuit. When the current is overload or the circuit is overheating, the bottom of the free end of the metal basal portion is heated, thereby separating the bottom of the free end of the metal basal portion from the conductive point, in order to clamp the positioning portion on the circuit board, and making the circuit in the off state. The circuit board with the circuit protection element in the invention can protect electronic elements on the circuit board from being burned through the operation of the circuit protection device. And the circuit protection device of the invention can not automatically return once being started, in order to guarantee the life safety of users. In addition, the circuit protection element in the invention simplifies structure, has simple and easy assembly, is labor-saving and time-saving, and can effectively reduce cost.
Description
Technical field
The present invention is the circuit board of a kind of circuit protecting element and tool circuit protecting element, refers to a kind of circuit protecting element that electronic component do not burnt and circuit board of tool circuit protecting element protected especially.
Background technology
The use of electricity has become modern humans society and can not the missing link, and the equipment of electrification is around around the life, especially computerization, informationalized industry, at home, traffic, education, amusement or the like, do not have electricity especially and do not become.
The modern life has easily been brought up in the use of electric power and equipment thereof, and is relative, and the electricity consumption that makes of safety also is that the modern have to be cautious.
In general, in the integrated circuit loop that electricity is provided, be provided with the master switch of power supply control, usually master switch is the state of energising, fuse or circuit breaker are set on it, when the electrical equipment that uses in the circuit loop too much causes situations such as current overload short circuit or circuit be overheated, blown fuse or circuit breaker escape and form the off state in integrated circuit loop.
Electronic component (for example comprising that commercialization, dwelling house computer are Ji Xiang Switches-itself equipment) can cooperate the oppressive characteristic of temporary abrupt voltage wave to avoid being subjected to overvoltage to damage in order to protect its extremely sensitive circuit in the industry present situation at present.As shown in Figure 1, Fig. 1 is that half temporary abrupt voltage wave of prior art suppresses system schematic, half temporary abrupt voltage wave suppresses system only can solve small fault situation on related normal the use, and be unable to cope with when center line (N) consume, ground wire (G) consume repeat current impulse when (for example coming from the lightning electric shock) for live wire to center line (L-N), live wire to ground wire (L-G) or center line to the contingent great over-voltage condition of ground wire (N-G).The surging inhibition system of correlation technique relates to the multiple different metal oxide varistor (MOV) 12 and the combination of Thermal Cutoffs 10.Metal oxide varistor 12 is typically the non-linear device of being made by composite ceramic material (for example zinc oxide grain combination non-crystalline material is formed).Metal oxide varistor 12 is kept current range of voltage (that is varistor voltage) broadness in the arrowband.When metal oxide varistor 12 lasting reception high pressure, or the high pressure that is received surpasses the rated value that can bear, and will produce high temperature, what is more with catching fire.Temperature is very big to the influence of electron component characteristic in electronic circuit, may cause work undesired outside, the also situation that may cause circuit to work, let alone element catching fire is to the influence of circuit.So on circuit loop; usually Thermal Cutoffs or circuit breaker can be set; when the electrical equipment that uses in the circuit loop too much caused situations such as current overload short circuit or circuit be overheated, Thermal Cutoffs will be fused or circuit breaker can be formed the off state in integrated circuit loop by escape.
Summary of the invention
The object of the present invention is to provide the circuit board of a kind of circuit protecting element and tool circuit protecting element; when the circuit loop of circuit board causes circuit overheated because of current overload; then circuit protecting element will be activated and cut off circuit loop, is burnt because of overheated to avoid electronic component.After circuit protecting element of the present invention is activated, can't automatically reply again, so can guarantee user's life security fully.
To achieve the above object, the invention provides a kind of circuit protecting element, comprise a metal base; And at least one fluting that is opened in this metal base, and then make this metal base formation have a flexible location division; Wherein, one end fixed combination of this metal base is in a circuit board, this circuit board is provided with an opening, the free-ended bottom of this metal base contacts the set conductiving point of this circuit board, with the "on" position of holding circuit, when current overload or circuit are overheated, the free-ended bottom of this metal base is heated, and the free-ended bottom of this metal base is separated with this conductiving point, and this location division this opening by this circuit board is arranged in this circuit board, makes circuit become off state.
To achieve the above object, the invention provides a kind of circuit board of tool circuit protecting element, this circuit board has an opening, comprise a plurality of electronic components, be arranged at this circuit board, those electronic components are formed a circuit loop, and through a power supply to provide electric power to this circuit loop; And a circuit protecting element, be arranged within this circuit loop and electrically connect this circuit board; Interim this circuit protecting element is a bimetal leaf, and this bimetal leaf is that to have at least one metal material of different thermal coefficient of expansions made, and this bimetal leaf comprises a metal base, and this metal base has a flexible location division; Wherein, one end of this metal base is combined in this circuit board, the free-ended bottom of this metal base contacts the set conductiving point of this circuit board, whereby, when the temperature of this circuit loop reaches a critical value, the free-ended bottom of the metal base of this bimetal leaf is heated, and the mechanical force of the free-ended bottom warp of this metal base is greater than the microkinetic of this location division warpage, and the free-ended bottom of this metal base is separated with this conductiving point, for this location division towards this opening to be arranged in this circuit board.
The present invention has following useful effect: circuit protecting element of the present invention compared with the prior art; after circuit protecting element startup of the present invention; automatic or manual is replied again; it must be delivered to the maintenance of former factory; so avoid the user to think and to use protection component of the present invention once again after automatic or manual is replied; but ignore in fact and may partly damage by electronic component, cause taking place irremediable situation, and guarantee user's life security fully.The designs simplification of circuit protecting element of the present invention, assembling is easily simple, and saving of work and time can make cost effectively reduce.
For enabling further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet appended accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 is half temporary voltage of the prior art inhibition system schematic of surging;
Fig. 2 is the circuit board schematic diagram of tool circuit protecting element of the present invention;
Fig. 3 A is the end view of the low-temperature metal element of first embodiment of the invention when not moving;
Fig. 3 B is the end view in low-temperature metal element when action of first embodiment of the invention;
Fig. 4 A is a circuit protecting element vertical view of the present invention;
End view before Fig. 4 B bimetal leaf of the present invention does not move;
End view when Fig. 4 C is bimetal leaf of the present invention action;
Fig. 5 A is the second embodiment vertical view of bimetal leaf of the present invention; And
Fig. 5 B is the 3rd embodiment vertical view of bimetal leaf of the present invention.
[main element description of reference numerals]
Low-temperature metal element 26
Metal base 300,400,500
Fluting 302,402,502
Location division 304,404,504
Free end 306,406,506
Embodiment
(as metal oxide varistor, metal oxide varistor MOV) produces phenomenon on fire because of the impaired high temperature that produces or because of continuing high pressure, and it will cause further infringement to rheostat peripheral cell or circuit in order to avoid rheostat in circuit.
Please refer to Fig. 2, Fig. 2 is the circuit board schematic diagram of tool circuit protecting element of the present invention, comprises a power supply 20, one circuit boards 22 and a circuit protecting element 24.
Above-mentioned circuit protecting element 24 can be a low-temperature metal element or a bimetal leaf.It is made that the low-temperature metal element can be the low-temperature metal material.Bimetal leaf is to utilize different metal to have the principle of different heat expansion rate, and two or more melts combine are become a slice metal, utilize multiple metal thermal coefficient of expansion difference each other, the distortion that is produced under uniform temp is to reach the flexural deformation of bimetal leaf.
If circuit protecting element 24 be the low-temperature metal element, when circuit board 22 was implemented, the low-temperature metal element can use welding or riveted way to be arranged at circuit board 22 and reach and be closely attached to electronic component on the circuit board 22.
If circuit protecting element 24 is a bimetal leaf; when circuit board 22 is implemented; one end of bimetal leaf is to be combined in circuit board 22 through rivet or other mode that can reach the same fixed function; the conductiving point that the free-ended bottom contact circuit plate 22 of bimetal leaf is set is with the "on" position of holding circuit.
Explain below circuit protecting element 24 of the present invention is how to be implemented on the circuit board 22.Please refer to Fig. 3 A and Fig. 3 B, Fig. 3 A and Fig. 3 B are the first embodiment end view that circuit protecting element of the present invention is implemented on circuit board.The circuit board of tool circuit protecting element of the present invention comprises that a plurality of electronic components 28 are arranged at circuit board 22, one power supplys (not shown) and a low-temperature metal element 26.
Convenient for example, thus an electronic component 28 in Fig. 3 A or Fig. 3 B, only disclosed, however when present embodiment was applied to circuit board 22, electronic component 28 was not worth in one it also may being a plurality of.If aforementioned circuit plate 22 is to be provided with a plurality of electronic components 28, these electronic components 28 can be formed a circuit loop.The circuit loop that power supply (not icon) provides electric power to be formed to the electronic component 28 of circuit board 22 makes that electronic component 28 can be in circuit board 22 runnings.
Low-temperature metal element 26 is to use welding or riveted way to be arranged at circuit board 22 and to be closely attached to electronic component 28.Low-temperature metal element 26 is with the made person of a low-temperature metal material, and the temperature range of its temperature-sensitive can be between 100 to 600 degree.
Fig. 3 A shows the end view when low-temperature metal element 26 does not move, when if the temperature in low-temperature metal element 26 circuit for detecting loops does not reach a critical value, critical value is the temperature value scope of the temperature-sensitive of circuit loop as described above, and this moment, the circuit loop of circuit board 22 was the states that are in normal operation.
End view when Fig. 3 B shows 26 actions of low-temperature metal element, when if the temperature in low-temperature metal element 26 circuit for detecting loops reaches critical value, low-temperature metal element 26 will by burn with cut off the electricity supply and circuit loop between annexation, make power supply can not supply power to circuit loop and can not burnt to guarantee electronic component.
Please refer to Fig. 4 A, Fig. 4 A is a circuit protecting element vertical view of the present invention.Fig. 4 B and Fig. 4 C, Fig. 4 B and Fig. 4 C are the second embodiment end view that circuit protecting element of the present invention is implemented on circuit board.
Circuit protecting element of the present invention shown in Fig. 4 A is a bimetal leaf 30 at second embodiment; the structure of bimetal leaf 30 comprises a metal base 300; and at least one fluting 302 that is opened in the metal base 300, and then make metal base 300 formation have a flexible location division 304.
Please also refer to Fig. 4 B and Fig. 4 C, Fig. 4 B is the end view before bimetal leaf 30 does not move.In Fig. 4 B and Fig. 4 C, bimetal leaf 30 is arranged on the circuit board 22, and bimetal leaf 30 set-up modes are explained as follows:
On circuit board 22, offer an opening 36, and be provided with a conductiving point 34.One end 308 of the metal base 300 under the bimetal leaf 30 is combined in circuit board 22 through a rivet 32 or other mode that can reach fixed function, the conductiving point 34 that the bottom contact circuit plate 22 of the free end 306 of metal base 300 is set is with the "on" position of holding circuit.When the temperature that detects the circuit loop of being made up of electronic component (not icon) when bimetal leaf 30 did not reach a critical value, then circuit loop was with normal operation.
Shown in Fig. 4 C, the end view when Fig. 4 C is bimetal leaf of the present invention 30 actions.When current overload or circuit were overheated, the bottom of the free end 306 of metal base 300 was by thermal source that conductiving point 34 transmitted and be heated, and by the metallic character of bimetal leaf 30 bottom of the free end 306 of metal base 300 separated with conductiving point 34 because of being heated.The thermal source that circuit is overheated to be produced is sent to bimetal leaf 30 through circuit board 22, and the bottom of being not only the free end 306 of metal base 300 is heated, and is that the bimetal leaf 30 of full wafer all can be heated.According to general common knowledge, when separated with conductiving point 34 because of being heated the bottom of the free end 306 of metal base 300, location division 304 also can be because of the court of the metal heated fine motion direction warpage away from circuit board 22.Yet, bimetal leaf 30 of the present invention will be because of the cause of bimetal properties, the mechanical force of the bottom warp of the free end 306 of metal base 300 is greater than the microkinetic of location division 304 warpages, impel location division 304 not towards direction warpage away from circuit board 22, but be opening 36 direction warpages to circuit board 22, make location division 304 be arranged in circuit board 22, circuit is formed the state that opens circuit by opening 36.
The bimetal leaf appearance design of the bimetal leaf of comparison diagram 4A, Fig. 5 A and Fig. 5 B, the wherein different flutings that are in metal base have different patterns.Fluting 302 patterns of the bimetal leaf of Fig. 4 A are the U type, and fluting 402 patterns of the bimetal leaf of Fig. 5 A are the I type, and fluting 502 patterns of the bimetal leaf of Fig. 5 B are two I types.
The bimetal leaf of following key-drawing 5A and Fig. 5 B is in the enforcement situation of circuit board running, bimetal leaf in the connection relationship of circuit board all with above-mentioned described identical, so display circuit board not in above-mentioned icon only is to explain the enforcement state of bimetal leaf in the circuit board running.
Fig. 5 A is explained as follows in the enforcement situation of circuit board running for the second embodiment vertical view of bimetal leaf of the present invention, the bimetal leaf of second embodiment.When the temperature in bimetal leaf circuit for detecting loop reaches critical value, the free end 406 of metal base 400 will be because of being heated towards away from circuit board 22 warpages, and circuit board 22 offers an opening in 404 corresponding positions, flexible location division of metal base 400, be located at circuit board for location division 404 by open card, circuit is formed the state that opens circuit, so power supply (not shown) can not burnt to guarantee electronic component with regard to not supplying power to circuit loop.
Fig. 5 B is explained as follows in the enforcement situation of circuit board running for the 3rd embodiment vertical view of bimetal leaf of the present invention, the bimetal leaf of the 3rd embodiment.When the temperature in bimetal leaf circuit for detecting loop reaches critical value, the free end 506 of metal base 500 will be because of being heated towards away from the circuit board warpage, and circuit board offers an opening in 504 corresponding positions, flexible location division of metal base 500, be arranged in circuit board for location division 504, circuit is formed the state that opens circuit, so power supply (not shown) can not burnt to guarantee electronic component with regard to not supplying power to circuit loop.
The present invention has following useful effect: after circuit protecting element of the present invention starts; automatic or manual is replied again; it must be delivered to the maintenance of former factory; so avoid the user to think and to use protection component of the present invention once again after automatic or manual is replied; but ignore in fact and may partly damage by electronic component; cause taking place irremediable situation, and guarantee user's life security fully.The designs simplification of circuit protecting element of the present invention, assembling is easily simple, and saving of work and time can make cost effectively reduce.
But the above only is preferred embodiment of the present invention, non-ly is intended to limit to protection scope of the present invention, and therefore the equivalence done of every utilization specification of the present invention and accompanying drawing content changes, and all in like manner all is contained within protection scope of the present invention explanation hereby.
Claims (8)
1. a circuit protecting element is characterized in that, comprising:
One metal base; And
At least one fluting that is opened in this metal base, and then make this metal base formation have a flexible location division;
Wherein, one end fixed combination of this metal base is in a circuit board, this circuit board is provided with an opening, the free-ended bottom of this metal base contacts the set conductiving point of this circuit board, with the "on" position of holding circuit, when current overload or circuit are overheated, the free-ended bottom of this metal base is heated, and the free-ended bottom of this metal base is separated with this conductiving point, and this location division this opening by this circuit board is arranged in this circuit board, makes circuit become off state.
2. circuit protecting element as claimed in claim 1 is characterized in that, wherein this metal base is the made bimetal leaf of at least one metal material with different thermal coefficient of expansions.
3. circuit protecting element as claimed in claim 1 is characterized in that, wherein this metal base utilizes the rivet fixed combination in this circuit board.
4. circuit protecting element as claimed in claim 1 is characterized in that, wherein this opening of being provided with of this circuit board corresponding to the below of the fluting in this metal base, is arranged in this circuit board for this location division.
5. circuit protecting element as claimed in claim 1 is characterized in that, wherein the pattern of this fluting is U type or I type.
6. the circuit board of a tool circuit protecting element is characterized in that, comprising:
One circuit board, this circuit board has an opening;
A plurality of electronic components are arranged at this circuit board, and those electronic components are formed a circuit loop, and through a power supply to provide electric power to this circuit loop; And
One circuit protecting element is arranged within this circuit loop and electrically connects this circuit board;
Wherein, this circuit protecting element is a bimetal leaf, and this bimetal leaf is that to have at least one metal material of different thermal coefficient of expansions made;
This bimetal leaf comprises a metal base, and this metal base has a flexible location division; Wherein, an end of this metal base is combined in this circuit board, and the free-ended bottom of this metal base contacts the set conductiving point of this circuit board;
When the temperature of this circuit loop reaches a critical value, the free-ended bottom of the metal base of this bimetal leaf is heated, and the mechanical force of the free-ended bottom warp of this metal base is greater than the microkinetic of this location division warpage, and the free-ended bottom of this metal base is separated with this conductiving point, for this location division towards this opening to be arranged in this circuit board.
7. the circuit board of tool circuit protecting element as claimed in claim 6 is characterized in that, wherein this bimetal leaf more comprises a fluting, makes this metal base form this location division, and this slotting position is corresponding to this opening of this circuit board.
8. the circuit board of tool circuit protecting element as claimed in claim 7 is characterized in that, wherein the pattern of this fluting is U type or I type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101538897A CN101388305B (en) | 2007-09-13 | 2007-09-13 | Circuit protecting element and circuit board having the circuit protecting element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101538897A CN101388305B (en) | 2007-09-13 | 2007-09-13 | Circuit protecting element and circuit board having the circuit protecting element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101388305A CN101388305A (en) | 2009-03-18 |
| CN101388305B true CN101388305B (en) | 2011-09-07 |
Family
ID=40477643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101538897A Expired - Fee Related CN101388305B (en) | 2007-09-13 | 2007-09-13 | Circuit protecting element and circuit board having the circuit protecting element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101388305B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4868535A (en) * | 1987-11-12 | 1989-09-19 | Itt Industries, Inc. | Miniaturized thermal contact breaker for printed circuit board |
| CN2519996Y (en) * | 2002-01-15 | 2002-11-06 | 乔日电业股份有限公司 | Short circuit proof press-button switch |
| CN2544447Y (en) * | 2002-05-22 | 2003-04-09 | 苏州元本电子有限公司 | Temp. protector for stepping motor |
| CN1414588A (en) * | 2002-09-11 | 2003-04-30 | 吕彩玲 | Heat sensitive overheat protective device |
| CN1176566C (en) * | 1997-01-11 | 2004-11-17 | 托马斯-贝茨国际公司 | Improvements in or relating to thermal trip arrangements |
-
2007
- 2007-09-13 CN CN2007101538897A patent/CN101388305B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4868535A (en) * | 1987-11-12 | 1989-09-19 | Itt Industries, Inc. | Miniaturized thermal contact breaker for printed circuit board |
| CN1176566C (en) * | 1997-01-11 | 2004-11-17 | 托马斯-贝茨国际公司 | Improvements in or relating to thermal trip arrangements |
| CN2519996Y (en) * | 2002-01-15 | 2002-11-06 | 乔日电业股份有限公司 | Short circuit proof press-button switch |
| CN2544447Y (en) * | 2002-05-22 | 2003-04-09 | 苏州元本电子有限公司 | Temp. protector for stepping motor |
| CN1414588A (en) * | 2002-09-11 | 2003-04-30 | 吕彩玲 | Heat sensitive overheat protective device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101388305A (en) | 2009-03-18 |
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Granted publication date: 20110907 Termination date: 20140913 |
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| EXPY | Termination of patent right or utility model |