CN203812666U - Controllable thermal protection voltage dependent resistor - Google Patents
Controllable thermal protection voltage dependent resistor Download PDFInfo
- Publication number
- CN203812666U CN203812666U CN201420014574.XU CN201420014574U CN203812666U CN 203812666 U CN203812666 U CN 203812666U CN 201420014574 U CN201420014574 U CN 201420014574U CN 203812666 U CN203812666 U CN 203812666U
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- CN
- China
- Prior art keywords
- silver electrode
- electrode layer
- pin
- zinc
- thermal protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000001419 dependent effect Effects 0.000 title abstract 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims abstract description 62
- 229910052709 silver Inorganic materials 0.000 claims abstract description 62
- 239000004332 silver Substances 0.000 claims abstract description 62
- 239000010410 layer Substances 0.000 claims abstract description 60
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000000919 ceramic Substances 0.000 claims abstract description 27
- 239000011787 zinc oxide Substances 0.000 claims abstract description 26
- 239000011241 protective layer Substances 0.000 claims abstract description 8
- 229960001296 zinc oxide Drugs 0.000 claims description 22
- 238000003466 welding Methods 0.000 claims description 14
- 230000008719 thickening Effects 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
Abstract
The utility model discloses a controllable thermal protection voltage dependent resistor, which comprises a zinc oxide voltage dependent resistor ceramic chip, silver electrode layers, an insulating strip, a first pin, a second pin, a thermal fuse and an insulating protective layer, wherein the upper surface and the lower surface of the zinc oxide voltage dependent resistor ceramic chip are coated with the silver electrode layers; the first pin is welded on the silver electrode layer on the lower surface of the zinc oxide voltage dependent resistor ceramic chip; the body is coated with the insulating protective layer; an upper concave pit and a lower concave pit, which are perpendicularly opposite, are arranged on the upper surface and the lower surface of the zinc oxide voltage dependent resistor ceramic chip; a thin wall formed between the upper concave pit and the lower concave pit is a pre-arranged heat source point capable of being broken down; the second pin is fixed on one side of the silver electrode layer on the upper surface through the insulating strip; one end of the thermal fuse is welded with the inner end of the second pin; the other end of the thermal fuse is correspondingly welded with the other side of the silver electrode layer. According to the controllable thermal protection voltage dependent resistor, as the position of the heat source yielding point is fixed, the fusing time of the thermal fuse can be effectively controlled and the technical effect of protecting the circuit is realized quickly and efficiently.
Description
Technical field
The utility model relates to a kind of piezo-resistance, more particularly, relates in particular to a kind of controlled thermal protection type piezo-resistance.
Background technology
Heat protection piezo-resistance series is representing the new development of protection using integrated circuit; overtemperature protection piezo-resistance is utilized too high transient voltage and electric current in its special nonlinear characteristic absorbing circuit; and rely on self-heating and heat radiation to discharge the high electric current of transient state and the voltage absorbing; it is comprised of a plurality of radial lead burning piezo-resistances, comprises the overheated integrated thermal active element that causes disconnecting that various conditions that are exclusively used in because of abnormal overvoltage, Limited Current and UL1449 general introduction cause.There is following technical problem in above-mentioned traditional heat protection piezo-resistance: one, there will be one to puncture hot source point when overtemperature protection piezo-resistance continuous firing adstante febre, this punctures the tender spots position that hot source point is positioned at the uncertain position of ceramics self-defect, because of its unordered hot source point without fixed position, cause overheated fuse can not guarantee consistent fusing time; Two, overtemperature protection piezoresistance electrode material is silver layer; it uses high temperature firelock welding (firelock flame envelope temperature reaches 1200 ℃) when pin and the welding of hot fuse; in high temperature firelock when welding, very easily destroys silver layer, will cause stagflation when through-flow to blow pad after silver layer is destroyed.For prevent when welding firelock high temperature burn out silver layer and cause through-flow stagflation to be blown, it is destroyed when high-temperature soldering that the thickness that need repeatedly print silver (more than 2 times) and increase silver layer removes to stop silver layer, but repeatedly Yin Yin can increase the cost of product again greatly; Three, simultaneously, current design insurance silk is linearity, and the requirement disconnecting for meeting needs gappedly between fuse and silver-colored face, and fuse and pin weld that time point can produce tin ball or dry joint causes product failure simultaneously.Therefore, how to address the above problem, become problem demanding prompt solution.
Utility model content
The purpose of this utility model is for above-mentioned the deficiencies in the prior art, and the controlled thermal protection type piezo-resistance that makes thermal source breakdown point position fixing is provided.
The technical solution of the utility model is such: a kind of controlled thermal protection type piezo-resistance, comprise Zinc-oxide piezoresistor ceramics, silver electrode layer, insulating trip, the first pin, the second pin, hot fuse wire and insulating protective layer, silver electrode layer is covered in the upper and lower surface of Zinc-oxide piezoresistor ceramics, the first pin is welded on the silver electrode layer of Zinc-oxide piezoresistor ceramics lower surface, insulating protective layer parcel body, the upper surface of Zinc-oxide piezoresistor ceramics and lower surface are provided with vertically opposite pit up and down, the thin-walled forming between upper and lower pit is default punctured hot source point, the second pin is fixed on a side of the silver electrode layer of upper surface by insulating trip, the inner welding of one end of hot fuse wire and the second pin, the other end is corresponding to be welded with the opposite side of silver electrode layer.
Above-mentioned controlled thermal protection type piezo-resistance, pit is near the pad setting of silver electrode layer and hot fuse wire.
Above-mentioned controlled thermal protection type piezo-resistance, hot fuse wire is provided with the kink of bending laterally at the welding ends of the second pin, forms skew gap between the silver electrode layer of kink and upper surface.
Above-mentioned controlled thermal protection type piezo-resistance; Zinc-oxide piezoresistor ceramics integral body is circular; silver electrode layer covers the upper and lower surface of circular Zinc-oxide piezoresistor ceramics; ring silver electrode layer surface is also provided with the thickening silver electrode layer of annular, and the first pin and hot fuse wire are welded on respectively on corresponding thickening silver electrode layer.
Above-mentioned controlled thermal protection type piezo-resistance, insulating trip and the second pin are fixed on the thickening silver electrode layer of upper surface by PUR.
Adopt the utility model of technique scheme, upper surface and lower surface by Zinc-oxide piezoresistor ceramics form vertically opposite pit up and down, upper and lower pit forms the thin-walled of default punctured hot source point, thermal source breakdown point position is fixed, when hot source point position from hot fuze pad more close to time overheated fuse just fused sooner, otherwise be difficult for fusing.The break time of melting that heat is melted disconnected fuse is set according to the position between controlled thermal source breakdown point position and hot fuse pad, while making overheated fuse pad more get close to hot source point, heat melt the fuse that breaks to melt the break time shorter.Thereby that can effectively control that heat melts disconnected fuse has melted the break time technique effect of circuit of having realized protection rapidly and efficiently.By be provided with at least thickening silver electrode layer of one deck annular on silver electrode layer surface, it is destroyed when high-temperature soldering that the thickness that effectively increases silver layer removes to stop silver layer, the silver slurry use amount that effectively reduces silver electrode layer is realized for revealing empty major part in welding position, the thickening silver electrode layer of annular middle part simultaneously, the thickening silver electrode layer ring limit that increases silver thickness retains effective silver-colored area, thereby keeps the technique effect of high throughflow ability.Simultaneously, by the kink that hot fuse wire is bent laterally in the inner welding ends setting with the second pin, between the silver electrode layer of kink and upper surface, form skew gap, the skew gap forming can guarantee gap between hot fuse wire and silver electrode layer, overlap joint welding simultaneously can contact copper cash tin ball or dry joint when stopping fuse and copper wire welding completely and occur, thus the stabilised quality of assurance product.
The utility model is applied to SPD product, alternating current circuit panel protection module, alternating current circuit power supply, surge protection bar connector, ac power meter, repositionable AC power tap, GFCI(ground-fault interrupter), UPS(uninterruptible power system), white domestic appliances, plug-in type SPD, current transformer and AC/DC power supply etc.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the utility model is described in further detail, but do not form any restriction of the present utility model.
Fig. 1 is the cross-sectional view of the utility model instantiation;
Fig. 2 is the syndeton schematic diagram of the concrete upper surface of the utility model;
Fig. 3 is the cross-sectional view of the utility model Zinc-oxide piezoresistor ceramics;
Fig. 4 is the vertical view of Fig. 3;
Fig. 5 is the structural representation of the hot fuse wire of the utility model.
In figure: Zinc-oxide piezoresistor ceramics 1, pit 11, the first silver electrode layers 2, thickening silver electrode layer 21, insulating trip 3, the first pin 4, the second pins 5, hot fuse wire 6, kink 61, epoxy resin surrounding layer 7, PUR 8.
Embodiment
Consult shown in Fig. 1～5, a kind of controlled thermal protection type piezo-resistance of the present utility model, comprise Zinc-oxide piezoresistor ceramics 1, silver electrode layer 2, insulating trip 3, the first pin 4, the second pin 5, hot fuse wire 6 and insulating protective layer 7, silver electrode layer 2 is covered in the upper and lower surface of Zinc-oxide piezoresistor ceramics 1, the first pin 4 is welded on the silver electrode layer of Zinc-oxide piezoresistor ceramics 1 lower surface, insulating protective layer 7 parcel bodies, the upper surface of Zinc-oxide piezoresistor ceramics 1 and lower surface are provided with a vertically opposite pit up and down 11, the thin-walled forming between upper and lower pit 11 is default punctured hot source point, the second pin 5 is fixed on a side of the silver electrode layer 2 of upper surface by insulating trip 3, the inner welding of one end of hot fuse wire 6 and the second pin 5, the other end is corresponding to be welded with the opposite side of silver electrode layer 2.
Pit 11 is near the pad setting of silver electrode layer 2 and hot fuse wire 6.
Hot fuse wire 6 is provided with the kink 61 of bending laterally at the welding ends of the second pin 5, forms skew gap between the silver electrode layer 2 of kink 61 and upper surface.
Zinc-oxide piezoresistor ceramics 1 integral body is circular, silver electrode layer 2 covers the upper and lower surface of circular Zinc-oxide piezoresistor ceramics 1, thickening silver electrode layer 21, the first pin 4 and hot fuse wire 6 that ring silver electrode layer 2 surface are also provided with annular are welded on respectively on corresponding thickening silver electrode layer 21.
Insulating trip 3 and the second pin 5 are fixed on the thickening silver electrode layer 21 of upper surface by PUR 8.
The utility model is when concrete production, for controlling piezo-resistance thermal source breakdown point, design Novel pressure die arranges salient point in control of heat source breakdown point position, realizes the upper and lower surface at Zinc-oxide piezoresistor ceramics 1 in stamping-out and forms vertically opposite pit 11.The second pin 5 and insulating trip 3 are fixed on to surface one side away from pit 11, and hot fuse wire 6 is mutually close with pit 11 with the pad of silver electrode layer 2.Thereby that can effectively control that heat melts disconnected fuse has melted the break time technique effect of circuit of having realized protection rapidly and efficiently.
In sum, the utility model is as specification and diagramatic content, makes actual sample and through repeatedly use test, from the effect of use test, provable the utility model can reach the object that it is expected, practical value is unquestionable.Above illustrated embodiment is only used for conveniently illustrating the utility model, not the utility model is done to any pro forma restriction, under any, in technical field, have and conventionally know the knowledgeable, if within not departing from the scope of technical characterictic that the utility model is put forward, utilize technology contents that the utility model discloses to make the local equivalent embodiment that changes or modify, and do not depart from technical characterictic content of the present utility model, all still belong in the scope of the utility model technical characterictic.
Claims (5)
1. a controlled thermal protection type piezo-resistance, comprise Zinc-oxide piezoresistor ceramics (1), silver electrode layer (2), insulating trip (3), the first pin (4), the second pin (5), hot fuse wire (6) and insulating protective layer (7), silver electrode layer (2) is covered in the upper and lower surface of Zinc-oxide piezoresistor ceramics (1), the first pin (4) is welded on the silver electrode layer of Zinc-oxide piezoresistor ceramics (1) lower surface, insulating protective layer (7) parcel body, it is characterized in that: the upper surface of Zinc-oxide piezoresistor ceramics (1) and lower surface are provided with vertically opposite pit up and down (11), the thin-walled forming between upper and lower pit (11) is default punctured hot source point, the second pin (5) is fixed on a side of the silver electrode layer (2) of upper surface by insulating trip (3), the inner welding of one end of hot fuse wire (6) and the second pin (5), the other end is corresponding to be welded with the opposite side of silver electrode layer (2).
2. controlled thermal protection type piezo-resistance according to claim 1, is characterized in that: pit (11) is near the pad setting of silver electrode layer (2) and hot fuse wire (6).
3. controlled thermal protection type piezo-resistance according to claim 1; it is characterized in that: hot fuse wire (6) is provided with the kink (61) of bending laterally at the welding ends of the second pin (5), forms skew gap between the silver electrode layer (2) of kink (61) and upper surface.
4. controlled thermal protection type piezo-resistance according to claim 1; it is characterized in that: Zinc-oxide piezoresistor ceramics (1) is whole for circular; silver electrode layer (2) covers the upper and lower surface of circular Zinc-oxide piezoresistor ceramics (1); ring silver electrode layer (2) surface is also provided with the thickening silver electrode layer (21) of annular, and the first pin (4) and hot fuse wire (6) are welded on respectively on corresponding thickening silver electrode layer (21).
5. controlled thermal protection type piezo-resistance according to claim 1, is characterized in that: insulating trip (3) and the second pin (5) are fixed on the thickening silver electrode layer (21) of upper surface by PUR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420014574.XU CN203812666U (en) | 2014-01-10 | 2014-01-10 | Controllable thermal protection voltage dependent resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420014574.XU CN203812666U (en) | 2014-01-10 | 2014-01-10 | Controllable thermal protection voltage dependent resistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203812666U true CN203812666U (en) | 2014-09-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420014574.XU Expired - Lifetime CN203812666U (en) | 2014-01-10 | 2014-01-10 | Controllable thermal protection voltage dependent resistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203812666U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107768052A (en) * | 2017-10-20 | 2018-03-06 | 惠州市欣旭电子有限公司 | A kind of SMD piezo-resistance manufacture craft and SMD piezo-resistance |
| US20220344078A1 (en) * | 2016-01-25 | 2022-10-27 | Littelfuse, Inc. | Metal oxide varistor with reinforced electrodes |
-
2014
- 2014-01-10 CN CN201420014574.XU patent/CN203812666U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220344078A1 (en) * | 2016-01-25 | 2022-10-27 | Littelfuse, Inc. | Metal oxide varistor with reinforced electrodes |
| CN107768052A (en) * | 2017-10-20 | 2018-03-06 | 惠州市欣旭电子有限公司 | A kind of SMD piezo-resistance manufacture craft and SMD piezo-resistance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140903 |
|
| CX01 | Expiry of patent term |