CN204144190U - A kind of circuit protection device - Google Patents
A kind of circuit protection device Download PDFInfo
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- CN204144190U CN204144190U CN201420571584.3U CN201420571584U CN204144190U CN 204144190 U CN204144190 U CN 204144190U CN 201420571584 U CN201420571584 U CN 201420571584U CN 204144190 U CN204144190 U CN 204144190U
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- lead
- control element
- out tablet
- make control
- break
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Abstract
The problem of potential safety hazard is produced for overcoming the easy turning circuit too early of circuit protection device in prior art, the utility model provides a kind of circuit protection device, comprises shell, first lead-out tablet of drawing from shell and the second lead-out tablet and is positioned at the break-make control element of described shell; Described break-make control element is electrically connected to described first lead-out tablet and the second lead-out tablet; Tripping action can be there is in described break-make control element when own temperature is more than safe temperature, to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet, and described break-make control element path action can occur at own temperature lower than during safe temperature, with by from the loop conducting of the first lead-out tablet through described break-make control element to the second lead-out tablet; Described first lead-out tablet and/or the second lead-out tablet are provided with the fuse protection element of fusible, can make to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet.Circuit can disconnect by the circuit protection device that the utility model provides in the situation such as short circuit or high temperature, avoids the too early conducting of circuit protection device and produces potential safety hazard.
Description
Technical field
The utility model relates to a kind of circuit protection device.
Background technology
In recent years, popularizing, for it provides the safety issue of the secondary rechargeable battery of portable power source (as lithium ion chargeable battery) day by day to become the focus of public attention along with various portable electronic address equipment.And the demand that equipment promotes further to battery durable ability, also higher safety requirements is proposed to battery charge and discharge process.As the battery saver be applied in secondary rechargeable battery protective circuit, there will be a known and be furnished with PTC and heater in circuit, realized the protective circuit that the control of PTC break-make is protected battery component with realization by heater.
And by the protective circuit of heater control PTC, require to be unfavorable for greatly realizing miniature requirement to circuit board requisite space.
Usually also adopt the break-make of bimetal leaf control circuit in prior art, play circuit protection effect.
Bimetal leaf has by two or more a kind of composite material that the metal of suitable performance or other material form, bimetal leaf also claims thrermostatic bimetal-plate, because the thermal coefficient of expansion of each constituent element layer is different, when the temperature is changed, the deformation of active layers is greater than the deformation of passive layer, thus the entirety of bimetal leaf will to passive layer curving, then the curvature of this composite material changes thus produces deformation.When the double metal temperature switch utilizing this characteristic to make uses in circuit, when circuit be short-circuited or transship and other abnormal conditions time, can there is deformation when temperature is raised to certain value in bimetallic, thus open circuit.Therefore bimetallic is widely used as the temperature protection switch of the devices such as mobile phone, electric heater, electric cooker, electric kettle.
But along with the mobile electronic devices such as mobile phone more and more become more meticulous, microminiaturized, make the volume of protection switch more and more less.For the common circuit protection device based on bimetal leaf, when after bimetal leaf intensification open circuit, if bimetal leaf cools and too early turning circuit fast, potential safety hazard will be brought; And due to the too early conducting of circuit, fault is not yet eliminated, bimetallic sector-meeting rapid temperature increases and open circuit again again, so circulation makes circuit break-make repeatedly, easily damages circuit.
Utility model content
Technical problem to be solved in the utility model produces security hidden trouble for the easy too early turning circuit upon opening of circuit protection device of the prior art, provides a kind of circuit protection device.
It is as follows that the utility model solves the problems of the technologies described above adopted technical scheme:
A kind of circuit protection device is provided, it is characterized in that, comprise shell, first lead-out tablet of drawing from shell and the second lead-out tablet and be positioned at the break-make control element of described shell; Described break-make control element is electrically connected to described first lead-out tablet and the second lead-out tablet; Tripping action can be there is in described break-make control element when own temperature is more than safe temperature, to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet, and described break-make control element path action can occur at own temperature lower than during safe temperature, with by from the loop conducting of the first lead-out tablet through described break-make control element to the second lead-out tablet; Described first lead-out tablet and/or the second lead-out tablet are provided with the fuse protection element of fusible, can make to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet.
In the circuit protection device that the utility model provides; on-off control unit is in current flow condition; when there is short circuit in circuit; on-off control unit self generates heat at once; after reaching safe temperature; on-off control unit generation action, disconnects from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet, plays circuit protection effect.
Further, described break-make control element can shrink when own temperature is more than safe temperature, and can extend lower than during safe temperature at own temperature; One end of described break-make control element is fixedly electrically connected on described second lead-out tablet, and the other end of described break-make control element is formed with the elongation of break-make control element or contraction and the contact contacting or be separated with described first lead-out tablet.
Further, described break-make control element is bimetal leaf or two-way memory alloy leader.
Further, described break-make control element is straight spirality or U-shaped.
Further, be also provided with heating element in described shell, the parallel connection of described heating element relatively described break-make control element is electrically connected to described first lead-out tablet and the second lead-out tablet, can be used for heating described break-make control element.
Further, described heating element can when the temperature of break-make control element be greater than safe temperature, and persistent fever, heats break-make control element, keeps the disconnection of break-make control element.
Further, described heating element is thick film resistance element or ceramic mould PTC element.
Further, described thick film resistance element is selected from the one in metal film thickness film resistance, thickness of oxidation film film resistance, synthesis thickness film resistance.
Further, the fusing-off temperature of described fuse protection element is than described safe temperature height 10-20 DEG C.
Accompanying drawing explanation
Fig. 1 is the schematic cross-section of circuit protection device under normally closed state provided in the utility model preferred implementation;
Fig. 2 is the schematic cross-section of circuit protection device under normal off-state provided in the utility model preferred implementation;
Fig. 3 is the schematic cross-section of circuit protection device under fuse protection element blown state provided in the utility model preferred implementation.
Reference numeral in Figure of description is as follows:
1, shell; 2, the first lead-out tablet; 3, the second lead-out tablet; 4, heating element; 5, break-make control element; 6, contact; 7, fuse protection element.
Embodiment
The technical problem solved to make the utility model, technical scheme and beneficial effect are clearly understood, below in conjunction with drawings and Examples, are further elaborated to the utility model.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
The circuit protection device that the utility model provides comprises shell, first lead-out tablet of drawing from shell and the second lead-out tablet and is positioned at the break-make control element of described shell; Described break-make control element is electrically connected to described first lead-out tablet and the second lead-out tablet; Tripping action can be there is in described break-make control element when own temperature is more than safe temperature, to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet, and described break-make control element path action can occur at own temperature lower than during safe temperature, with by from the loop conducting of the first lead-out tablet through described break-make control element to the second lead-out tablet; Described first lead-out tablet and/or the second lead-out tablet are provided with the fuse protection element of fusible, can make to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet.
By being provided with the fuse protection element of fusible on the loop of described break-make control element to the second lead-out tablet at the first lead-out tablet; can enter to improve the reliability of circuit protection device; avoid occurring security incident under the extreme case such as tripping action inefficacy of break-make control element; in the utility model, fuse protection element by from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet disconnect at once play open circuit protection effect.
According to the utility model; for different circuit or different environments for use; the safe temperature of the break-make control element in circuit protection device is not quite similar; and fuse protection element need play a protective role when break-make control element open circuit effect was lost efficacy; therefore; fuse protection element can not onset within the scope of break-make control element normal working temperature, and under preferable case, the fusing-off temperature of described fuse protection element is than described safe temperature height 10-20 DEG C.
As known to those skilled in the art, above-mentioned fuse protection element can adopt existing low-melting alloy (namely conventional fuse), specifically by being commercially available.
In foregoing circuit protective device; shell is for encapsulating all the other functional parts; as is known in the art; shell is generally isolation material, and one or more that specifically can adopt in polyvinyl chloride, polypropylene, nylon, phenolic resins, liquid crystal polymer, polyphenylene sulfide, phenolic resins or epoxy resin prepare.
According to the utility model, above-mentioned first lead-out tablet and the second lead-out tablet are the extraction electrode of circuit protection device.First lead-out tablet and the second lead-out tablet are all arranged on shell, and respective one end is all positioned at shell, and the other end extends to housing exterior, for being electrically connected with external circuit.
Preferably, in described shell, be also provided with heating element, the parallel connection of described heating element relatively described break-make control element is electrically connected to described first lead-out tablet and the second lead-out tablet, can be used for heating described break-make control element.In shell, heating element is directly electrically connected to the first lead-out tablet and the second lead-out tablet.In the energized state, heating element is heatable.
Break-make control element is also electrically connected with the first lead-out tablet and the second lead-out tablet.Meanwhile, break-make control element and heating element are arranged in parallel.
Described first lead-out tablet and the second lead-out tablet are all drawn in described shell; Described heating element is electrically connected to described first lead-out tablet and the second lead-out tablet simultaneously, for heating described break-make control element; The relatively described heating element parallel connection of described break-make control element be electrically connected to described first lead-out tablet and the second lead-out tablet; Simultaneously, tripping action can be there is in described break-make control element when own temperature is more than safe temperature, to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet, and described break-make control element path action can occur at own temperature lower than during safe temperature, with by from the loop conducting of the first lead-out tablet through described break-make control element to the second lead-out tablet.
The break-make control element be arranged in parallel and heating element are electrically connected to the first lead-out tablet and the second lead-out tablet simultaneously.The break-make control element resistance conventional due to this area is very little, and conventional heating element all has larger resistance, and when the two is in parallel, heating element can be similar to be thought by the short circuit of break-make control element.Only under break-make control element off state, heating element is normal operational heat.
Meanwhile, in the utility model, on-off control unit has simultaneously and to cut off under uniform temperature state (such as short circuit or in a large number generate heat) from the function of the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet exceeding.
Usually, in the course of the work, for avoiding producing safe construction because of situations such as short circuits, usually need ensure that circuit working is below uniform temperature, in the utility model, this temperature is defined as safe temperature to circuit.When particular elements in circuit or operational environment are higher than this safe temperature, for safety, circuit need be cut off to check circuit.Understandable, for different circuit and environment for use, the concrete numerical value of safe temperature is not quite similar, and the safe temperature value under different situations is known to those skilled in the art.
According to the utility model, concrete, can there is action when own temperature is more than safe temperature in described break-make control element; to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet; now, break-make control element cuts off circuit, plays a protective role to circuit.
Importantly, because break-make control element cuts off the loop at its place, make heating element become normal operating conditions from being shorted state-transition, and start heating.Because break-make control element is behind its loop, place of cut-out, be in off-position, its temperature can decline.If break-make control element temperature drops quickly to lower than safe temperature, the quick turning circuit again of on-off control unit meeting, is easy to produce potential safety hazard.In the utility model, heating element is started working when break-make control element cuts off its loop, place, and generates heat, and to slow down the decline of break-make control element temperature, thus provides the sufficient time for looking up the fault reason, reduces potential safety hazard.
In the utility model, tripping action and the path action of above-mentioned break-make control element do not limit, only need the effect that can reach cut-out and loop, conducting break-make control element place, the tripping action of such as break-make control element can extend for break-make control element, be separated with the first lead-out tablet and/or the second lead-out tablet to make break-make control element, equally, the tripping action of break-make control element also can shrink for break-make control element, is separated with the first lead-out tablet and/or the second lead-out tablet to make break-make control element.Which kind of mode of concrete employing, those skilled in the art can carry out accommodation according to concrete structure.
Similar, above-mentioned path action does not specifically also limit, and only needing can by on-off control unit conducting.
Concrete, for simplifying the structure of circuit protection device, described break-make control element can shrink when own temperature is more than safe temperature, and can extend lower than during safe temperature at own temperature.
In the utility model, described break-make control element concrete set-up mode in the enclosure fixedly can be electrically connected on described second lead-out tablet for one end of described break-make control element, and the other end of described break-make control element contacts with the elongation of break-make control element or contraction with described first lead-out tablet or is separated.
For realizing better electrical contact, at described break-make control element, the end of the first lead-out tablet is provided with contact.As known to those skilled in the art, the shape of described contact can be hemisphere, square or slot shape.The material of described contact can be one or more in Pt, Au, Ag, Cu, Ni or Sn.
According to the utility model, for above-mentioned on-off control unit, specifically can adopt the existing various element producing deformation at different temperatures, the bimetallic element of the high-temperature shrinkage low temperature recovery that existing current-carrying type such as can be adopted to install.Or break-make control element can adopt existing two-way memory alloy leader.As known to those skilled in the art, described two-way memory alloy leader can be selected from one or more in TiNi alloy, TiNiNb alloy or TiNiFe alloy.Above-mentioned bimetal leaf and two-way memory alloy leader are all by being commercially available.
For above-mentioned on-off control unit, its shape is not particularly limited, and such as described break-make control element can be straight spirality or U-shaped.According to the utility model, namely described fuse protection element can be separately set on the first lead-out tablet and/or the second lead-out tablet, to make to disconnect from the first lead-out tablet through the loop of described break-make control element to the second lead-out tablet, thus circuit is played a protective role, described fuse protection element also can be arranged with heating element jointly, described heating element is arranged in the enclosure, and the parallel connection of relatively described break-make control element is electrically connected to described first lead-out tablet and the second lead-out tablet, now fuse protection element, the syndeton of break-make control element and heating element is: fuse protection element is connected with described break-make control element, and with described break-make control element, relative described heating element is in parallel simultaneously.
For the heating element adopted in the utility model, specifically can adopt existing various electrical heating elements, such as described heating element is thick film resistance element or ceramic mould PTC element.For above-mentioned thick film resistance element, the one in metal film thickness film resistance, thickness of oxidation film film resistance, synthesis thickness film resistance specifically can be selected from.
Understandable; when fuse protection elements act; circuit protecting element has been in irreversible damaging guard mode; for disconnecting the circuit between the first lead-out tablet and the second lead-out tablet thoroughly; under preferable case, the parallel-connection structure that described fuse protection element is formed with described break-make control element and described heating element is connected.
Below in conjunction with Fig. 1-Fig. 3, the circuit protection device structure that the utility model preferred implementation provides is further elaborated.
Fig. 1 shows the structure of this circuit protection device normal operating conditions.
Concrete, be arranged with the first lead-out tablet 2 and the second lead-out tablet 3 in the insulation square shell 1 of polyphenylene sulfide material in parallel.It is outside that first lead-out tablet 2 and the second lead-out tablet 3 all extend to shell 1, for being electrically connected with external circuit.Second lead-out tablet 3 is positioned at below the first lead-out tablet 2.
Straight spiral bimetallic element lower end as break-make control element 5 is fixedly electrically connected on the end that the second lead-out tablet 3 is positioned at shell 1, and the upper end of break-make control element 5 is fixed with silver contact 6.
Contact 6 is resisted against the lower surface that the first lead-out tablet 2 is positioned at the end of shell 1 under the effect of break-make control element 5 support force, and is electrically connected with the first lead-out tablet 2.
Be provided with the metal film thickness film resistance as heating element 4 in shell 1 simultaneously.Heating element 4 is electrically connected with the first lead-out tablet 2 and the second lead-out tablet 3 at the first lead-out tablet 2 and the second lead-out tablet 3 middle part simultaneously.
The first lead-out tablet 2 between heating element 4 and break-make control element 5 is also provided with fuse protection element 7.First lead-out tablet 2 is separated into two sub-lead-out tablets by this fuse protection element 7, is electrically connected between two sub-lead-out tablets by this fuse protection element 7.
Now, in normal operation, the temperature of break-make control element 5 is lower than safe temperature; contact 6 is resisted against bottom the first lead-out tablet 2; heating element 4 is approximate to be shorted, and the fusing-off temperature of fuse protection element 7 is higher than safe temperature, and fuse protection element 7 is in normally state.
Fig. 2 shows the structure of (for short circuit) when this circuit protection device is in abnormality.
Concrete, under short-circuit condition, first lead-out tablet 2 produces huge current flow on the loop of contact 6, break-make control element 5 to the second lead-out tablet 3, break-make control element 5 temperature is sharply increased to more than safe temperature, break-make control element 5 produces contraction at once, make contact 6 from the first lead-out tablet 2 bottom part from, thus cut off the first lead-out tablet 2 through contact 6, the loop of break-make control element 5 to the second lead-out tablet 3.Because the fusing-off temperature of fuse protection element 7 is higher than safe temperature, now fuse protection element 7 does not fuse.
When break-make control element 5 shrinks, after cutting off circuit, break-make control element 5 temperature can decline.Because heating element 4 is still electrically connected with the first lead-out tablet 2 and the second lead-out tablet 3, and be in off state due to loop, break-make control element 5 place, heating element 4 normally works.The heat that heating element 4 produces is passed to break-make control element 5, has delayed the speed that break-make control element 5 temperature declines, has made the temperature of break-make control element 5 can drop to below safe temperature through the long period, for checking that abnormal cause provides grace time.
Work as failture evacuation, and the temperature of break-make control element 5 is lower than after safe temperature, break-make control element 5 extends; by contact 6 jack-up, make contact 6 again be resisted against the first lead-out tablet 2 lower surface, circuit protection device is normally worked again; now, heating element 4 is again shorted and no longer generates heat.
Fig. 3 shows the structure of this circuit protection device when being in extremity (with short circuit and break-make control element 5 cannot be punctured into example).
Concrete; because break-make control element 5 cannot shrink; first lead-out tablet 2 through contact 6, the loop of break-make control element 5 to the second lead-out tablet 3 is in channel status all the time; simultaneously due to short circuit; continue in above-mentioned loop to produce huge current flow, constant temperature is increased to the fusing-off temperature of fuse protection element 7.Now, fuse protection element 7 fuses, by the first lead-out tablet 2 through contact 6, the loop of break-make control element 5 to the second lead-out tablet 3 disconnects, thus produces protection to circuit protecting element.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection range of the present utility model.
Claims (9)
1. a circuit protection device, is characterized in that, comprises shell (1), first lead-out tablet (2) of drawing from shell and the second lead-out tablet (3) and is positioned at the break-make control element (5) of described shell (1);
Described break-make control element (5) is electrically connected to described first lead-out tablet (2) and the second lead-out tablet (3); Tripping action can be there is in described break-make control element (5) when own temperature is more than safe temperature, will disconnect from the first lead-out tablet (2) through the loop of described break-make control element (5) to the second lead-out tablet (3), and path action can be there is at own temperature lower than during safe temperature in described break-make control element (5), with will from the first lead-out tablet (2) through described break-make control element (5) to the loop conducting of the second lead-out tablet (3);
Described first lead-out tablet (2) and/or the second lead-out tablet (3) are provided with the fuse protection element (7) of fusible, can make to disconnect from the first lead-out tablet (2) through the loop of described break-make control element (5) to the second lead-out tablet (3).
2. circuit protection device according to claim 1, is characterized in that, described break-make control element (5) can be shunk when own temperature is more than safe temperature, and can extend lower than during safe temperature at own temperature;
One end of described break-make control element (5) is fixedly electrically connected on described second lead-out tablet (3), and the other end of described break-make control element (5) is formed with the elongation of break-make control element (5) or contraction and the contact (6) contacting or be separated with described first lead-out tablet (2).
3. circuit protection device according to claim 2, is characterized in that, described break-make control element (5) is bimetal leaf or two-way memory alloy leader.
4. circuit protection device according to claim 3, is characterized in that, described break-make control element (5) is straight spirality or U-shaped.
5. circuit protection device according to claim 1; it is characterized in that; heating element (4) is also provided with in described shell (1); described heating element (4) relatively described break-make control element (5) parallel connection is electrically connected to described first lead-out tablet (2) and the second lead-out tablet (3), can be used for heating described break-make control element (5).
6. circuit protection device according to claim 5; it is characterized in that, described heating element (4) can when the temperature of break-make control element (5) be greater than safe temperature, persistent fever; break-make control element (5) is heated, keeps the disconnection of break-make control element (5).
7. circuit protection device according to claim 5, is characterized in that, described heating element (4) is thick film resistance element or ceramic mould PTC element.
8. circuit protection device according to claim 7, is characterized in that, described thick film resistance element is selected from the one in metal film thickness film resistance, thickness of oxidation film film resistance, synthesis thickness film resistance.
9. circuit protection device according to claim 1, is characterized in that, the fusing-off temperature of described fuse protection element (7) is than described safe temperature height 10-20 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420571584.3U CN204144190U (en) | 2014-09-30 | 2014-09-30 | A kind of circuit protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420571584.3U CN204144190U (en) | 2014-09-30 | 2014-09-30 | A kind of circuit protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204144190U true CN204144190U (en) | 2015-02-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420571584.3U Active CN204144190U (en) | 2014-09-30 | 2014-09-30 | A kind of circuit protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204144190U (en) |
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2014
- 2014-09-30 CN CN201420571584.3U patent/CN204144190U/en active Active
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