CN1240050A - Electrical fuse - Google Patents
Electrical fuse Download PDFInfo
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- CN1240050A CN1240050A CN97180355A CN97180355A CN1240050A CN 1240050 A CN1240050 A CN 1240050A CN 97180355 A CN97180355 A CN 97180355A CN 97180355 A CN97180355 A CN 97180355A CN 1240050 A CN1240050 A CN 1240050A
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- ptc element
- fusible conductor
- fuse
- electric fuse
- electric
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/0411—Miniature fuses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C7/00—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material
- H01C7/13—Non-adjustable resistors formed as one or more layers or coatings; Non-adjustable resistors made from powdered conducting material or powdered semi-conducting material with or without insulating material current responsive
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/046—Fuses formed as printed circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
- H01H85/048—Fuse resistors
- H01H2085/0483—Fuse resistors with temperature dependent resistor, e.g. thermistor
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuses (AREA)
- Glass Compositions (AREA)
- Surgical Instruments (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
The present invention relates to an electrical fuse having a series circuit formed by a PTC element and a fusible conductor. To create an electrical fuse of above-mentioned type having an automatic trigger adjustment to ageing phenomena or increase of nominal resistance of the PTC element and having a simple and compact structure of the whole circuit it is suggested that the PTC element (2) and the fusible conductor (3) have close thermal coupling.
Description
The present invention relates to a kind of electric fuse, this electric fuse has a series circuit, and this series circuit is formed by PTC (positive temperature coefficient) element and a fusible conductor.
Patent specification DE4143095 discloses such electric assembly, and it can prevent the generation of the overload situations that caused by super-high-current.A PTC element is worked under switching mode, has wherein set up and the corresponding temperature of electric current, and this temperature has determined the resistance of PTC element again.In order to prevent each PTC element thermal overload, be provided with the series circuit of a PTC element and a fusible conductor.A conduction Connection Element is connected between PTC element and the fusible conductor.Described Connection Element plays the conduction interconnect function between fusible conductor and PTC element, and plays the effect of thermal component for the PTC element, plays the effect of protection housing simultaneously for the fusible conductor.The fusible conductor is like this design: it can just in case make under the serious overload situations that takes place to cause PTC component wear or circuit to burn out the PTC element with outside the contact electricity keep apart.When fusing of fusible lead or vaporization, this Connection Element with labyrinth also plays the effect of plasma gatherer.
International Patent Application WO 95/35577 discloses a kind of electric fuse, and it comprises a series circuit, and this series circuit is made up of the PTC element of a dish type and the fusible elements of a printed circuit.In this case, by means of clamping contact, the PTC element of pottery is connected electrically on the side of the substrate that carries printed circuit, and the fusible conductor that is the fusible elements form of printing is arranged on the rear side of substrate.The PTC element is wanted and can be protected circuit downstream by the quick and big resistance variations in its invertible switch scope.The overload level of PTC element is to be determined by the electric current of 10-40A under the 600V voltage.In this case, the complete electricity that extremely QA fusible circuit is wanted to realize circuit is isolated, and burns out and/or explodes so that prevent the PTC element.
The generation type that contacts of the layout of each element and the structure of circuit and PTC element allows to make efficiently circuit, because at the required size that has of the ceramic PTC element of substandard resistance, this has produced strict restriction to microminiaturization.
According to prior art, the PTC element can vitiable critical range be covered by the fusible conductor of suitable nominal parameter.Two parts of documents being quoted are all supposed: when being lower than the critical range of being determined by overvoltage and thermal overload situation or high electric current, the PTC element as one by temperature controlled resistor continuous operation, and any variation can not take place in the predetermined properties under switching mode.The fusible conductor is determined its nominal parameter according to these ptc characteristicses.If the standard resistor of PTC element increases in the course of the work, for example owing to aging phenomenon increases, the point of isolating based on the required electricity of security reason will be offset so, and can not adapt to the trigger characteristic of fusible conductor.
In addition, with regard to its switching characteristic, compare with having at a slow speed the fusible circuit of operating characteristics, each PTC element has obviously big inertia (slowness).
Therefore, the objective of the invention is to provide a kind of electric fuse of the above-mentioned type, this electric fuse has simple and compact structure, can avoid above-mentioned shortcoming simultaneously.
According to the present invention, this purpose is achieved in that PTC element and fusible conductor have thermal coupling closely.
A kind of electric fuse according to the present invention comprises a series circuit, and this series circuit is formed by a PTC element and a fusible conductor, the changes in resistance of the PTC element of having considered wherein that ageing-related.Therefore, after experiencing the invertible switch interval several times, the PTC element has had the standard resistor of increase.For identical electric current, consequent heat reaches the degree of an increase.According to the present invention, the close thermal of fusible conductor and PTC element coupling makes can be according to the hot working point of the property settings fusible conductor of PTC element.As a result, the switching characteristic of fuse element is subjected to decisive influence.Therefore, along with the variation of temperature of PTC element, under the high temperature of given PTC element, when occurring that increase a little even when extremely of short duration overload situations or overload spike, the fusible conductor triggers as early as possible.
Just in case high overcurrent is arranged, the reaction of PTC element is too late for great majority are used delays, and therefore can not provide sufficient protection.Even in the time before the critical temperature that reaches the PTC element, this very slow characteristic also may cause the overload of circuit downstream and cause its damage.According to the present invention, the feasible this characteristic too slow in high current range that can substitute the PTC element of the thermal coupling of fusible conductor and PTC element by the characteristic of fusible conductor.This has just obtained a kind of new fuse feature, and its characteristic can be by PTC element and the decision of fusible conductor.This new features according to fuse of the present invention will elaborate with reference to one group of characteristic curve schematic diagram below.
In a kind of improvement project, the close thermal coupling between PTC element and the fusible conductor realizes by means of following mode: the fusible conductor forms a lead-in wire, and this lead-in wire is connected to a contact of PTC element.This not only provides directly and has electrically contacted, and good thermo-contact is provided.In the course of the work, will set up heat balance in the zone of the contact point between fusible conductor and PTC element, described heat balance is by the thermal losses of PTC element decision.Therefore, the hot working point of fusible conductor is determined by the PTC element.
The fusible conductor can advantageously be designed to a lead or flat conductor.In this case, the preferred fusible lead that in the fusible circuit of test and test, had used type that adopts.Especially when small-sized, also can adopt a root bead line (bonding wire) as the fusible conductor, an outer contact is electrically connected to a contact of PTC element by it.In each case, all realized by this way with the PTC element contact and provide the fusible conductor, the type of the formation that is proposed contact also can be distinguished by the ability of the expansion compensation between its contact point.When combining with claim 9, it is especially clear that the importance of this specific character becomes.
Adopt a lead as the fusible conductor, this has simplified the manufacturing according to electric fuse of the present invention significantly, and it is minimum that the overall circuit cost is reduced to.The close thermal contact occurs in the basic point place of the lead on the PTC element surface, and continues to have guaranteed under the overheated situation isolation of reliable breakaway-element electricity at the PTC element.Particularly, except above-mentioned two elements of fuse, only need two outer contacts and integrally-built substrate of carrying or fuse housing, an embodiment is described as following employing.
According to claim 4, can also adopt a conductive layer as the fusible conductor, be connected to the lead-in wire of one of PTC element contact with formation.In order to adapt to the function of fusible conductor, this conductive layer has a constriction at least one some place, and when the fusible circuit was triggered, this constriction disconnected.When being used for according to electric fuse of the present invention, this constriction can be by suitably being coupled near forming close thermal with the PTC element.Different with prior art, in this embodiment, fuse element and PTC element are arranged in order on the same side of carrying integrally-built substrate.This has simplified isolation and/or the separation and the manufacturing of whole fuse structure and its surrounding environment.
According to claim 6, the fusible conductor also can form thick film conductor.When adopting the PTC compound-material of paste, it is particularly clear that the advantage of this embodiment becomes, because whole electric fuse can be made a thick film circuit equably together with its composition element in this case.
In a preferred embodiment, by the fusible conductor is arranged on the PTC element, the thermal coupling between PTC element and the fusible conductor is especially strengthened.Particularly, in this case, the fusible conductor is arranged on the connection electrode of PTC element.According to a kind of favourable mode, the fusible conductor is directly formed by a PTC element metal layer as contact area, and except a tie point, the fusible conductor dbus is crossed an electric insulation layer and kept apart with PTC element and/or metal layer electricity.By selecting suitable material, electric insulation layer can be very thin, so the thermal resistance between PTC element and the fusible conductor is extremely low.In such a way, have the substrate of the PTC element of good thermal coupling characteristic itself as the fusible conductor.Under the situation of the independent substrate of neither one, fuse of the present invention can be so that very compact structure and minimum independent parts and processing step are made.In this case, the fusible conductor can be the fusible conductor of a lead or stratiform, and this is according to required trigger characteristic decision.If the fusible conductor covers the compound material or curable thermally-stabilised ointment covers by a kind of, in some cases, as will adopt an exemplary embodiment demonstration, even can economize decapsidate.
In a kind of improvement project of above-mentioned electric fuse, be designed to be positioned at a termination area on the electric insulation layer with the opposed contact of the join domain of fusible elements.At least one outer Connection Element, especially the connecting pin of a wire form is fixed to termination area.Therefore, fuse of the present invention is fit to directly be installed on the custom circuit plate that has the hole.But, it also is feasible being installed in the known shell structure with IEC standard contacts grid (contact grid) coupling, forms with housing connector on the termination area to contact.
In a kind of particularly advantageous improvement project, the PTC element is made of a kind of polymeric material.The feature of this material is that resistance sharply changes with temperature.Changes in resistance is by caused by temperature controlled thermal expansion.In order to compensate this expansion, preferably adopt the fusible conductor of wire form, and on main expansion direction, form contact.But, permanent contact also may be formed on the direction vertical with main expansion direction.To adopt an exemplary embodiment to describe this feature below.
Adopt the polymeric matrix of sheet can advantageously realize the integrated of PTC element in the Miniaturized electric fuse.Because its flat shape, it is possible forming reliable the contact with this polymeric matrix, and they have very little structure height, low weight and good ptc characteristics.According to claim 11, preferably by temperature controlled expansion basically along the PTC element of the described type of a principal direction, the result is, expansion direction is advantageously perpendicular to a given bearing-surface of PTC element.
Also can advantageously form with ceramic PTC element or with the PTC element that forms by the sintering matrix according to electric fuse of the present invention and to contact in described mode.For example, in fuse according to the present invention, can adopt barium titanate (BaTiO
3) as the PTC element, like this, with respect to the comparison fuse according to prior art, the characteristic of this fuse improves significantly.
In a kind of improvement project, be so to select according to the structure of electric fuse of the present invention: it can also insert in the known housing, provides verified thus and reliable protection, makes it to avoid the influence of external environment.In addition, this housing is to make according to the standard contacts grid of routine is a large amount of, and provides sufficient space for the very compact structure of electric fuse of the present invention.
According to claim 14, can be reduced to such degree according to the size of electric fuse of the present invention: but it can be a SMD installation elements.Thus, fuse of the present invention can adopt modern manufacturing and assembly technology to form without any problem ground is whole according to the mode that meets automatic machinery production.
The switching characteristic of fusible conductor is by the thermal losses thermal control of PTC element.But, disconnect constantly, it can also be advantageously auxiliary by limit arc or arc suppression.This material is preferably disposed in the zone of fuse area (blowing-zone) of fusible conductor.
According to claim 16, the fusible conductor is to constitute like this: diffusion technology can be carried out in the course of the work.It is slower that this makes turn-off characteristic and the quick acting fuse of fusible conductor compare action.Especially, for this purpose, the electrolytic deposition of one deck tin on the fusible conductor, along with variation of temperature, this layer in from diffusion into the surface to the fusible conductor a bit.
Different with the above-mentioned fuse according to prior art, the present invention always forms simple and is convenient to microminiaturized structure, and it has the switching characteristic that is greatly improved, even also is like this when above-mentioned whole features of the present invention and improvement project are considered and/or realize.
One exemplary embodiment of the present invention is described below with reference to accompanying drawings, in the accompanying drawing:
Fig. 1 is one group of characteristic schematic diagram;
Fig. 2 is the perspective view of an embodiment that does not have the fuse of shell;
Fig. 3 is the perspective view of another embodiment that does not have the fuse of shell;
Fig. 4 a and 4b are two schematic diagrames of another embodiment of fuse.
Fig. 1 demonstrates a kind of characteristic curve of electric fuse in the mode of schematic illustration, and this electric fuse comprises a series circuit, and this series circuit is formed by a PTC element and a thermal coupling fusible conductor.In this figure, the drawn characteristic curve of a PTC element of a fuse and the characteristic curve of a fusible conductor, these characteristic curves be switching time t to the change curve of current strength I, wherein two axles all are logarithmic scales.In this case, in the low current zone, the characteristic curve of PTC element is positioned at before the characteristic curve of fusible conductor of fuse.In the high current zone, these characteristic curves converge at place, a crosspoint at last.Then, along with electric current continues to increase, these characteristic curves and then separation, the characteristic curve of the fusible conductor of fuse always is in before the characteristic curve of PTC element significantly.Therefore, in this zone, the action of fusible conductor is obviously early than the PTC element.
Therefore, the boundary between two zones has been determined in these two characteristic crosspoints, and in these two zones, the thermal coupling series circuit that is formed by this two elements is with visibly different mode work.In the zone that is arranged in crosspoint left side, the PTC element is by regulating its intrinsic resistance with reversible isolation method, in other words realize that in the mode of repeatably switch motion overload regulates.What be positioned at the right side, crosspoint is the permanent and electric fully zone that isolates; wherein; when the temperature of PTC element has sharply raise; the electricity of fusible conductor executive circuit is isolated; thereby provide protection in mode, prevent damage that may on the PTC element, take place or the damage that takes place at circuit downstream separately owing to the switching characteristic excessively slowly of PTC element by temperature indication control.
Only when the temperature of PTC element be steady state value and when therefore the working temperature of the fusible conductor of fuse is steady state value, just form a fixing point as the crosspoint of the boundary between reversible conductive region or irreversible area of isolation.Here be the curve that draws corresponding to for example 125 ℃ temperature.Because the coupling of the close thermal of the temperature of PTC element, this with the characteristic curve of whole fusible circuit with Fig. 1 in the corresponding mode of direction shown in the arrow move.This also makes the PTC element avoided working in the critical current zone.
Fig. 2 is the perspective view of an embodiment of fuse 1, and this fuse is to be made of a series circuit that comprises PTC element 2 and fusible conductor 3.In this case, the fusible conductor 3 that is lead 4 forms is as a lead-in wire of drawing from a contact 6, and it stretches out and is connected to a tie point 7 of PTC element 2.In this case, PTC element 2 preferably is made of a kind of polymer 8 with ptc characteristics.The characteristics of polymer 8 are to have preferential expansion direction 9.It is to be made by how tame manufacturer as the polymeric matrix 10 of sheet, but only is that its part that is suitable for this application is installed in the fuse 1.In this case, metal level 12 is applied on this part of sheet polymer matrix 10, and overlay Surface Vertical of living in is in preferential expansion direction 9.Last metal layer 12 is formed for the tie point 7 of lead 4; Following metal layer 12 is electrically connected to the second outer contact 6, and this electrical connection is for example to realize that by means of the tack coat 13 of conduction tack coat 13 is formed by the binding agent or the soldering paste of conduction.
Lead 4 is freely arranged between the metal layer 12 of tack coat on the left side contact 6 13 and polymer 8.In fuse housing (not shown), this zone 14 can adopt extinguishing arc or limit arc material to fill.Doing so not only can be for lead 4 provides guiding, but also can form the mechanical stability of lead 4.
In order to protect PTC element 2 to avoid electric arc influence, can also select to come overlay area 14 by a kind of potting compound, wherein the fuse area of fusible conductor is arranged in this zone.Under extremely microminiaturized situation or in order to form the fusible circuit, lead 4 also can be substituted by bonding wire.Because thermal coupling, the operating characteristics that is exceedingly fast of fusible conductor is normally unnecessary.
On the surface of lead 3, be provided with a coat, this coat be form by tin and preferably electrolytic deposition.Lead 3 is made of for example silver, copper or gold itself.The effect that adopts tin to carry out surface-coated is, in the course of work of fusible conductor, can take place with the diffusion process of temperature correlation, compares with fast motion fusible circuit thus, and the action that becomes of the turn-off characteristic of lead is more and more slower.For other fusible conductor design scheme, also there is similar process in itself.
Fig. 3 is the perspective view according to another embodiment of fuse of the present invention.In this case, a conductive layer 16 has been applied on the substrate 15, and 17 places have a constriction 18 to conductive layer 16 in the position.The conductive layer 16 of Xing Chenging can prepare so in such a way, for example, adopts method for printing screen to make thick film.Except printed circuit, for this application, the circuit board of photochemical method preparation also is fine.Outer contact 6 is being applied on the substrate 15 on the substrate 15 or with the form of sintered paste by electrolytic deposition.In this case, conductive layer 16 extends to a position that is positioned at slightly before the right side contact 6 from the contact 6 in left side.Between right side contact 6 and conductive layer 16, directly be connected electrically in the zone and be cut off in 19.Exclusion region 19 is covered by the part of the sheet polymer matrix 10 of PTC element 2, and polymeric matrix 10 1 ends are electrically connected to the wide end of layer 16, and the other end is electrically connected to outer contact 6.Therefore, in another embodiment, outside two, between the contact 6, made the series circuit of forming by fusible conductor 3 and PTC element 2 once more.
The zone 14 that should be pointed out that the fuse area place of fusible conductor 3 is arranged near PTC element 2, realizes the close thermal coupling thus.In this case, this fuse area 14 can be covered by a kind of potting compound, and this potting compound has suitable arc suppression characteristic.
But the fuse shown in Fig. 3 is represented the exemplary design of SMD installation elements 20.By same employing method for printing screen or another kind of thick film preparation method with the PTC element as a kind of coating cream, the technology that is used to prepare this element can standardization.But, also can adopt conventional standard P TC element for example as some part of polymer sheet 10.The polymeric matrix 10 of this sheet has the metal layer 12 as contact usually on both side surface.In this embodiment that is applied to fuse 1, the contact area to fusible conductor 3 and outer contact 6 to be connected is cut off, and is short-circuited in regional 19 avoiding.So electric current flow to contact 6 from the end of fusible conductor 3 by PTC element 2.
According to the similar mode of a kind of and above-mentioned sheet polymer matrix 10 whole formations, the ceramic matrix that adopts similar structure also is feasible, for example the ceramic matrix of being made by barium titanate.Thus, it is no problem adopting all conventional PTC designs with reference to the manufacturing of Fig. 2 and 3 embodiment that describe.
Fusible conductor and the thermal coupling between the PTC element and the characteristic of modern ptc material according to careful selection, the size of described fuse can be very little, for a short time, for example be installed in the known fuse housing to being enough to make at the fuse structure shown in Fig. 2 and 3, this known fuse housing is such as TR5
Or SM3
Housing.As a result, fuse has obtained an additional outer protective cover.Thus, they avoid external disturbance better, can also make simultaneously their surrounding environment avoid the influence of the plasma of being overflowed effectively under the situation that fuse is disconnected by the fusible conductor.In addition, such housing can be complementary at interval with the corresponding IEC contact grid of connector, and can make in large quantity.
Fig. 4 a and 4b are two schematic diagrames of another embodiment of fuse 1.In this very compact design of fuse 1, fusible conductor 3 is set directly on the PTC element 2, as a result, between these two circuit elements, set up very strong thermal coupling, increased phenomenon so that fusible conductor working point can adapt to the standard resistor of aging phenomenon or PTC element automatically.In this case, PTC element 2 can be formed by pottery or plastic substrate, and is used as the substrate of fusible conductor 3 simultaneously.Thus, different with the design of for example Fig. 2, in illustrated this exemplary embodiment, fuse will constitute under the situation of not using substrate 15 fully.
In this exemplary embodiment, fusible conductor 3 is a kind of thick film fusible conductors.But, it also can be designed to lead-type fusible conductor, because since very close with PTC element 2, good thermal coupling all can be guaranteed in both cases with PTC element 2.In this exemplary embodiment, two tie points 7 of fusible conductor 3 all are positioned on the PTC element 2 in each case, and a tie point 7 is set directly on the metal layer 12.For fear of the short circuit of fuse element 3, second tie point 7 is positioned on the metal termination zone 22, and the part in this zone 22 is fixed on the electric insulation layer 23.Therefore, termination area 22 is isolated by the insulating barrier 23 and the material electricity of metal layer 12 and PTC element 2.But, different with the situation shown in Fig. 4 a for this purpose, metal layer 12 there is no need to establish breach 24 for insulating barrier 23.These layers are all very thin, and thus can easily overlapped setting.
Except second join domain 7 that is used for fusible conductor 3, termination area 22 also makes the conduction of an outer Connection Element 25 fixedly become feasible.In this case, the connecting pin 26 of lead shape is selected as Connection Element 25, the result, and fuse 1 can be inserted in the circuit board with holes.Certainly, termination area 22 also can be designed to parts with fusible conductor 3, for example under the situation of the fusible conductor 3 of the fusible conductor of flat conductor formula or punched metal sheet form.Then, according to common mode, realize fixing on the metal layer 12 of PTC element 2 and contact formation.Termination area 22 can for example be bonded on the electric insulation layer 23 by binding agent and be fixed, and insulating barrier 23 materials own also can be used as binding agent in this case.
Fig. 4 b shows the embodiment of Fig. 4 a with the end view form, and it shows the simple structure of fuse 1.The insertion of insulating barrier 23 has formed such current path: from connecting pin 26 by first tie point 7 of PTC element 2, by fusible conductor 3 to second tie points 7 and termination area 22 and thus to second connecting pin 26 to fusible conductor 3.Because the breach 24 in the metal layer 12 of PTC element 2, fusible conductor 3 and PTC element 2 are only realized electrically isolated from one by the insulating barrier 23 of very little thickness.But, this little isolation has guaranteed fusible conductor 3 and the 2 desired good thermal couplings of PTC element.
If fusible conductor 3 is covered by known cover layer or potting compound, embodiment shown in Fig. 4 a and the 4b also can not adopt an independent housing, because the plasma that is discharged by the fusible conductor can be captured, therefore can not produce any infringement to peripheral circuits when disconnecting.
By means of the cramped construction shown in the end view among Fig. 4 b, under situation without any the further adaptive measure of structure, also can be easily with the fuse of present embodiment insert in the known shell structure in equipment fuse field, above-mentioned TR5 for example
In the housing.
Claims (16)
1. electric fuse, it has a series circuit, and this series circuit is formed by a PTC element and a fusible conductor, it is characterized in that: PTC element (2) and fusible conductor (3) have thermal coupling closely.
2. according to the electric fuse of claim 1, it is characterized in that: fusible conductor (3) forms a lead-in wire, and this lead-in wire is connected to a contact of PTC element (2).
3. according to the electric fuse of claim 1 and/or 2, it is characterized in that: fusible conductor (3) is formed by a lead (4), is especially formed by a root bead line.
4. according to the electric fuse of claim 1 and/or 2, it is characterized in that: fusible conductor (2) is formed by a conductive layer (16).
5. according to the electric fuse of claim 4, it is characterized in that: conductive layer (16) locates to have a constriction (18) at least one position (17).
6. according to the electric fuse of claim 4 and/or 5, it is characterized in that: the conductive layer (16) of fusible conductor (3) is formed by a thick film circuit.
7. according to one in the aforementioned claim or multinomial electric fuse, it is characterized in that:
Fusible conductor (3) is arranged on the PTC element (2), especially is arranged on the metal layer (12) of PTC element (2), and this metal layer is used as a contact area,
Except tie point (7), fusible conductor (3) is isolated by an electric insulation layer (23) and PTC element and/or metal layer (12) electricity.
8. according to the electric fuse of claim 7, it is characterized in that:
Be designed to a termination area (22) on the electric insulation layer (23) with the opposed contact of join domain (7) (6),
Can be with the fixing termination area so far of at least one outer Connection Element (25), the especially connecting pin of a wire (26).
9. according to one in the aforementioned claim or multinomial electric fuse, it is characterized in that: PTC element (2) is made of a kind of polymer (8).
10. according to the electric fuse of claim 9, it is characterized in that: PTC element (2) is that the part by a sheet polymer matrix (10) forms.
11. the electric fuse according to claim 9 and/or 10 is characterized in that: PTC element (2) be to be substantially perpendicular to bearing-surface of PTC element (2) to produce by temperature controlled expansion (9).
12. according to one among the claim 1-8 or the electric fuse of omnibus claims, it is characterized in that: PTC element (2) is made of a kind of pottery, especially barium titanate.
13. according to one in the aforementioned claim or multinomial electric fuse, it is characterized in that: fuse (1) can insert in the known housing.
14., it is characterized in that according to one in the aforementioned claim or multinomial electric fuse: fuse (1) but be a SMD installation elements (20).
15. according to one in the aforementioned claim or multinomial electric fuse, it is characterized in that: fuse (1) comprises in the zone (14) of the fuse area of limitting arc or arc suppression, these materials to be preferably disposed on fusible conductor (3).
16. according to the electric fuse of aforesaid or omnibus claims, it is characterized in that: the surface-coated of fusible conductor (3) has tin, and this coat especially applies by means of electrolytic deposition process.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29621154U DE29621154U1 (en) | 1996-12-05 | 1996-12-05 | Electrical fuse |
| DE29621154.0 | 1996-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1240050A true CN1240050A (en) | 1999-12-29 |
| CN1138295C CN1138295C (en) | 2004-02-11 |
Family
ID=8032891
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971803552A Expired - Fee Related CN1138295C (en) | 1996-12-05 | 1997-12-05 | Electrical fuse |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0943150B1 (en) |
| JP (1) | JP2001505709A (en) |
| CN (1) | CN1138295C (en) |
| AT (1) | ATE195199T1 (en) |
| DE (2) | DE29621154U1 (en) |
| WO (1) | WO1998025285A2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102422376A (en) * | 2009-03-25 | 2012-04-18 | 保险丝公司 | Solderless surface mount fuse |
| CN104919670A (en) * | 2013-01-11 | 2015-09-16 | 泰科电子日本合同会社 | Protection element |
| CN107799501A (en) * | 2017-11-08 | 2018-03-13 | 电安科技（嘉兴）有限公司 | The Transient Voltage Suppressor of fuse protection |
| CN109314022A (en) * | 2016-06-20 | 2019-02-05 | 伊顿智能动力有限公司 | High-presure power fuse comprising antifatigue fuse element |
| CN109791861A (en) * | 2016-10-14 | 2019-05-21 | 大陆汽车有限公司 | The method of circuit arrangement, motor vehicles and the manufacture circuit arrangement including fuse |
| CN114730679A (en) * | 2019-11-21 | 2022-07-08 | 力特保险丝公司 | Circuit protection device with positive temperature coefficient device and spare fuse |
| US12040109B2 (en) | 2020-11-13 | 2024-07-16 | Littelfuse, Inc. | Circuit protection device with PTC device and backup fuse |
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| EP1150307B1 (en) * | 2000-04-26 | 2008-10-22 | Littelfuse Ireland Development Company Limited | A thermally protected metal oxide varistor |
| JP2001319803A (en) * | 2000-05-09 | 2001-11-16 | Marcon Electronics Co Ltd | Nonlinear voltage resistor |
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| DE102016205691A1 (en) * | 2016-04-06 | 2017-10-12 | Tridonic Jennersdorf Gmbh | LED module in chip-on-board technology |
| EP3244436A1 (en) * | 2016-05-10 | 2017-11-15 | EBG Elektronische Bauelemente GmbH | High power resistor with resistor coating and fuse wire |
| DE202018101537U1 (en) * | 2018-03-20 | 2019-06-27 | Tridonic Jennersdorf Gmbh | Electronic module with automatic protection against excessive temperatures |
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| US4413301A (en) * | 1980-04-21 | 1983-11-01 | Raychem Corporation | Circuit protection devices comprising PTC element |
| DE8908139U1 (en) * | 1989-07-04 | 1989-10-12 | Siegert GmbH, 8501 Cadolzburg | Fuse element in thick-film technology components |
| DE4143095C1 (en) * | 1991-12-27 | 1993-04-08 | Roederstein Spezialfabriken Fuer Bauelemente Der Elektronik Und Kondensatoren Der Starkstromtechnik Gmbh, 8300 Landshut, De | Electrical building block, for simplicity and reliability - comprises resistor in series with melt fuse and connection element forming protective wall section, fixed on substrate with silicone adhesive |
| DE4219304C2 (en) * | 1992-06-12 | 1994-03-31 | Roederstein Kondensatoren | Reliable overcurrent protection component with a small footprint and simple construction |
| DE4222278C1 (en) * | 1992-07-07 | 1994-03-31 | Roederstein Kondensatoren | Process for the manufacture of electrical thick film fuses |
| WO1995035577A2 (en) * | 1994-06-22 | 1995-12-28 | Littelfuse, Inc. | Improved dual element circuit protection device |
| JP3067011B2 (en) * | 1994-11-30 | 2000-07-17 | ソニーケミカル株式会社 | Protection element and method of manufacturing the same |
-
1996
- 1996-12-05 DE DE29621154U patent/DE29621154U1/en not_active Expired - Lifetime
-
1997
- 1997-12-05 EP EP97952885A patent/EP0943150B1/en not_active Expired - Lifetime
- 1997-12-05 AT AT97952885T patent/ATE195199T1/en not_active IP Right Cessation
- 1997-12-05 CN CNB971803552A patent/CN1138295C/en not_active Expired - Fee Related
- 1997-12-05 WO PCT/EP1997/006807 patent/WO1998025285A2/en active IP Right Grant
- 1997-12-05 JP JP52521198A patent/JP2001505709A/en active Pending
- 1997-12-05 DE DE69702719T patent/DE69702719T2/en not_active Expired - Lifetime
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| CN102422376A (en) * | 2009-03-25 | 2012-04-18 | 保险丝公司 | Solderless surface mount fuse |
| US8937524B2 (en) | 2009-03-25 | 2015-01-20 | Littelfuse, Inc. | Solderless surface mount fuse |
| CN102422376B (en) * | 2009-03-25 | 2015-11-25 | 保险丝公司 | solderless surface mount fuse |
| CN104919670A (en) * | 2013-01-11 | 2015-09-16 | 泰科电子日本合同会社 | Protection element |
| TWI609384B (en) * | 2013-01-11 | 2017-12-21 | 太谷電子日本合同公司 | Protection device |
| CN109314022A (en) * | 2016-06-20 | 2019-02-05 | 伊顿智能动力有限公司 | High-presure power fuse comprising antifatigue fuse element |
| CN109791861A (en) * | 2016-10-14 | 2019-05-21 | 大陆汽车有限公司 | The method of circuit arrangement, motor vehicles and the manufacture circuit arrangement including fuse |
| US10593504B2 (en) | 2016-10-14 | 2020-03-17 | Continental Automotive Gmbh | Circuit arrangement |
| CN109791861B (en) * | 2016-10-14 | 2020-08-11 | 大陆汽车有限公司 | Circuit arrangement comprising a fuse, motor vehicle and method for producing said circuit arrangement |
| CN107799501A (en) * | 2017-11-08 | 2018-03-13 | 电安科技（嘉兴）有限公司 | The Transient Voltage Suppressor of fuse protection |
| CN107799501B (en) * | 2017-11-08 | 2020-01-10 | 电安科技（嘉兴）有限公司 | Fuse protected transient voltage suppressor |
| CN114730679A (en) * | 2019-11-21 | 2022-07-08 | 力特保险丝公司 | Circuit protection device with positive temperature coefficient device and spare fuse |
| US12040109B2 (en) | 2020-11-13 | 2024-07-16 | Littelfuse, Inc. | Circuit protection device with PTC device and backup fuse |
Also Published As
| Publication number | Publication date |
|---|---|
| DE29621154U1 (en) | 1998-04-02 |
| CN1138295C (en) | 2004-02-11 |
| EP0943150A2 (en) | 1999-09-22 |
| JP2001505709A (en) | 2001-04-24 |
| WO1998025285A2 (en) | 1998-06-11 |
| EP0943150B1 (en) | 2000-08-02 |
| WO1998025285A3 (en) | 1998-08-20 |
| ATE195199T1 (en) | 2000-08-15 |
| DE69702719D1 (en) | 2000-09-07 |
| DE69702719T2 (en) | 2000-11-23 |
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