CN209625950U - Overheat overvoltage protection piezoresistor - Google Patents
Overheat overvoltage protection piezoresistor Download PDFInfo
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- CN209625950U CN209625950U CN201920471987.3U CN201920471987U CN209625950U CN 209625950 U CN209625950 U CN 209625950U CN 201920471987 U CN201920471987 U CN 201920471987U CN 209625950 U CN209625950 U CN 209625950U
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Abstract
A kind of overheat overvoltage protection piezoresistor; including ceramic dielectric substrate, the first conductive metal electrode, the second conductive metal electrode, first lead, the second lead and insulation encapsulated layer; it is characterized in that: the overheat overvoltage protection piezoresistor further includes temperature protective device; temperature protective device includes fuse, insulation shell and two fuse pins, and fuse is set in insulation shell；First lead upper end is connect with the first conductive metal electrode; the insulation shell of temperature protective device is attached on the second conductive metal electrode by thermal conductive adhesive layer; one fuse pin is connect with the second conductive metal electrode, and another fuse pin is connect with the second lead upper end.For the utility model when there is abnormal over-voltage or overcurrent, fuse heat absorption, which disconnects, forms open circuit, cuts off circuit connection, piezoresistor no longer heating power, so that it is even on fire effectively to avoid insulation encapsulated layer from smoldering, security performance is high.
Description
Technical field
The utility model relates to resistors, and in particular to a kind of overheat overvoltage protection piezoresistor.
Background technique
Piezoresistor is that a kind of with nonlinear wind vibration and have the solid-state voltage of transient suppression overvoltage effect quick
Sensing unit.A kind of existing piezoresistor, including ceramic dielectric substrate, the first conductive metal electrode, the second conductive metal electricity
Pole, first lead, the second lead and insulation encapsulated layer, the first conductive metal electrode, the second conductive metal electrode are respectively arranged on pottery
On the two sides of ceramic dielectric substrate, first lead upper end connect with the first conductive metal electrode and (is usually welded by scolding tin), the
Two lead upper ends connect (usually by scolding tin weld) with the second conductive metal electrode, insulate encapsulated layer by ceramic dielectric substrate,
First conductive metal electrode, first lead upper end, the second conductive metal electrode and the second lead upper end are sealed, under first lead
End and the second lead lower end are extend out to outside insulation encapsulated layer.Zinc oxide piezoresistor ceramic can be used in above-mentioned ceramic dielectric substrate
Material is made, and zinc oxide piezoresistor ceramic material material and adds various other microelements based on zinc oxide (ZnO)
It is made.This piezoresistor in use, when there is abnormal over-voltage or overcurrent, due to piezoresistor still in
On-state, piezoresistor meeting persistent fever heating, is easy to cause insulation encapsulated layer to smolder even on fire, safety is poor.
Summary of the invention
The technical problem to be solved by the utility model is to provide a kind of overheat overvoltage protection piezoresistor, this overheats
Overvoltage protection piezoresistor can open a way in time in the presence of abnormal over-voltage or overcurrent, avoid insulation encapsulated layer from smoldering even and rise
Fire, security performance are high.The technical solution adopted is as follows:
A kind of overheat overvoltage protection piezoresistor, including ceramic dielectric substrate, the first conductive metal electrode, the second conduction
Metal electrode, first lead, the second lead and insulation encapsulated layer, the first conductive metal electrode, the second conductive metal electrode difference
On the two sides of ceramic dielectric substrate, it is characterized in that: the overheat overvoltage protection piezoresistor further includes temperature protection
Device, temperature protective device include fuse, insulation shell and two fuse pins, and fuse is set in insulation shell, and two
A fuse pin connect with fuse both ends respectively and extend out to outside insulation shell；First lead upper end and the first conductive gold
Belonging to electrode connection, the insulation shell of temperature protective device is attached on the second conductive metal electrode by thermal conductive adhesive layer, and one
Fuse pin is connect with the second conductive metal electrode, and another fuse pin is connect with the second lead upper end；Insulate encapsulated layer
By ceramic dielectric substrate, the first conductive metal electrode, first lead upper end, the second conductive metal electrode, temperature protective device and
Second lead upper end is sealed, and first lead lower end and the second lead lower end are extend out to outside insulation encapsulated layer.
Above-mentioned overheat overvoltage protection piezoresistor is equivalent to a conventional varistor and connects with temperature protective device.It is above-mentioned
Overheat overvoltage protection piezoresistor can absorb over-voltage and overcurrent, when there is abnormal over-voltage or overcurrent, ceramics
Dielectric substrate and the fever of two conductive metal electrodes, the heat transfer of generation to the temperature protection being attached on ceramic dielectric substrate
On device；After fever is more than the protection temperature of temperature protective device, fuse heat absorption, which disconnects, forms open circuit, and cutting circuit connects
It connects, piezoresistor no longer heating power, solving traditional pressure sensitive resistor cannot open a way in time after over-voltage or overcurrent
The encapsulated layer that now insulate is smoldered or even problem on fire, security performance with higher.
Above-mentioned insulation shell separates fuse and the second conductive metal electrode, rise insulating effect, prevent fuse with
The contact of second conductive metal electrode.It is after insulation encapsulated layer encases the second lead upper end, the second lead upper end is conductive with second
Metal electrode separates, and prevents the second lead upper end from contacting with the second conductive metal electrode.
Temperature protective device and the second conductive metal electrode are adhesively fixed together by above-mentioned thermal conductive adhesive layer, make temperature
The position of protective device is able to fixed holding, while playing good conductive force, can lead ceramic dielectric substrate and two
The heat that electric metal electrode generates quickly passes to temperature protective device.The material of above-mentioned thermal conductive adhesive layer can be used conventional
The good adhesive of heating conduction, such as: the Henkel hot melt adhesive 6208TDS of Henkel Corp., Shi Min company, Japan CA-
186AB glue etc..
In general, above-mentioned first lead upper end is welded by scolding tin and the first conductive metal electrode；Temperature protective device one is protected
Dangerous silk pin is welded by scolding tin and the second conductive metal electrode, and another fuse pin of temperature protective device passes through scolding tin and the
The welding of two lead upper ends.
Above-mentioned ceramic dielectric substrate can be used zinc oxide piezoresistor ceramic material and be made, zinc oxide piezoresistor ceramic material
Material material and is added various other microelements and is made based on zinc oxide (ZnO).
Above-mentioned first conductive metal electrode, the second conductive metal electrode can be silver electrode, copper electrode or nickel electrode etc..
It is preferred that above-mentioned fuse is silk thread made of alloy fusing point within the scope of 160-220 DEG C, and such as: You Xiyu
Silk thread made of the alloy that silver, copper form, fusing point is about 217-218 DEG C；Or silk made of the alloy being made of tin and lead
Line, fusing point are about 183 DEG C；Or silk thread made of the alloy being made of tin and lead, bismuth, fusing point is about 183 DEG C.
Insulation shell described above can be used plastic material and be made, other insulating materials (such as ceramics) can also be used and be made.
Above-mentioned insulation encapsulated layer generallys use epoxy resin resistant to high temperature and is formed, and the temperature being resistant to should be higher than that insurance
The fusing point of silk, and reach 94V-0 standard.
In preferred embodiment, above-mentioned overheat overvoltage protection piezoresistor further includes auxiliary lead, auxiliary lead upper end and the
Two conductive metal electrodes connection (auxiliary lead upper end usually passes through scolding tin and the second conductive metal electrode welds).It is above-mentioned to overheat
When pressure protection piezoresistor access circuit, auxiliary lead can be connected to LED light, overheat the pressure-sensitive electricity of overvoltage protection with prompt
Whether resistance device is in normal operating conditions, is monitored to the state of overheat overvoltage protection piezoresistor.
The utility model gathers temperature protective device in piezoresistor in a series arrangement, and temperature protective device can
Heat caused by ceramic dielectric substrate and conductive metal electrode is drawn, when there is abnormal over-voltage or overcurrent, ceramic dielectric
Substrate and conductive metal electrode generate heat, in the heat transfer to the temperature protective device being attached on ceramic dielectric substrate of generation；
After fever is more than the protection temperature of temperature protective device, fuse heat absorption, which disconnects, forms open circuit, cuts off circuit connection, pressure-sensitive electricity
Device no longer heating power is hindered, so that it is even on fire effectively to avoid insulation encapsulated layer from smoldering, security performance is high.
Detailed description of the invention
Fig. 1 is the structural schematic diagram (saving insulation encapsulated layer) of the preferred embodiment in the utility model 1；
Fig. 2 is the A-A cross-sectional view of Fig. 1；
Fig. 3 is the structural schematic diagram (saving insulation encapsulated layer) of the preferred embodiment in the utility model 2.
Specific embodiment
Embodiment 1
As depicted in figs. 1 and 2, this overheat overvoltage protection piezoresistor includes ceramic dielectric substrate 1, the first conductive gold
Belong to electrode 2, the second conductive metal electrode 3, first lead 4, the second lead 5, temperature protective device 6 and insulation encapsulated layer；First
Conductive metal electrode 2, the second conductive metal electrode 3 are respectively arranged on the two sides of ceramic dielectric substrate 1；Temperature protective device 6
Including fuse 61, insulation shell 62 and two fuse pins 63,64, fuse 62 is set in insulation shell 62, two guarantors
Dangerous silk pin 63,64 connect with 61 both ends of fuse respectively and extend out to 62 outside of insulation shell；4 upper end of first lead and first
Conductive metal electrode 2 connects, and the insulation shell 62 of temperature protective device 6 is attached to the second conductive gold by thermal conductive adhesive layer 8
Belong on electrode 3, fuse pin 63 is connect with the second conductive metal electrode 3, and fuse pin 64 and 5 upper end of the second lead connect
It connects；Encapsulated layer insulate for ceramic dielectric substrate 1, the first conductive metal electrode 2,4 upper end of first lead, the second conductive metal electrode
3, temperature protective device 6 and 5 upper end of the second lead are sealed, and 4 lower end of first lead and 5 lower end of the second lead extend out to insulating bag
Outside sealing.Insulation shell 62 separates fuse 61 and the second conductive metal electrode 3, plays insulating effect, prevents fuse
61 contact with the second conductive metal electrode 3.After insulation encapsulated layer encases 5 upper end of the second lead, by 5 upper end of the second lead and the
Two conductive metal electrodes 3 separate, and prevent 5 upper end of the second lead from contacting with the second conductive metal electrode 3.
Temperature protective device 6 and the second conductive metal electrode 3 are adhesively fixed together by thermal conductive adhesive layer 8, make temperature
The position of protective device 6 is able to fixed holding, while playing good conductive force, can be by ceramic dielectric substrate 1 and two
The heat that conductive metal electrode 2,3 generates quickly passes to temperature protective device 6.The material of thermal conductive adhesive layer 8 can be used often
The good adhesive of the heating conduction of rule, such as: the Henkel hot melt adhesive 6208TDS of Henkel Corp., Shi Min company, Japan CA-
186AB glue etc..
It is welded by scolding tin 9 and the first conductive metal electrode 24 upper end of first lead；The fuse of temperature protective device 6 draws
Foot 63 is welded by scolding tin 10 and the second conductive metal electrode 3, the fuse pin 64 of temperature protective device 6 by scolding tin 11 and
The welding of second lead, 5 upper end.
Ceramic dielectric substrate 1 can be used zinc oxide piezoresistor ceramic material and be made, zinc oxide piezoresistor ceramic material
It material and adds various other microelements based on zinc oxide (ZnO) and is made.
First conductive metal electrode 2, the second conductive metal electrode 3 can be silver electrode, copper electrode or nickel electrode.
Fuse 61 is silk thread made of alloy fusing point within the scope of 160-220 DEG C, such as: by tin and silver, copper group
At alloy made of silk thread, fusing point is about 217-218 DEG C；Or silk thread made of the alloy being made of tin and lead, it melts
About 183 DEG C of point；Or silk thread made of the alloy being made of tin and lead, bismuth, fusing point is about 183 DEG C.
Insulation shell 62 is made of plastic material.
Insulation encapsulated layer is formed using epoxy resin resistant to high temperature, and the temperature being resistant to should be higher than that the molten of fuse
Point, and reach 94V-0 standard.
The overheat overvoltage protection piezoresistor of the present embodiment is equivalent to a conventional varistor and temperature protective device string
Connection.The overheat overvoltage protection piezoresistor can absorb over-voltage and overcurrent, when there is abnormal over-voltage or overcurrent,
Ceramic dielectric substrate 1 and two conductive metal electrodes 2,3 generate heat, and the heat of generation is transmitted to through thermal conductive adhesive layer 8 to be attached to
On temperature protective device 6 on ceramic dielectric substrate 1；After fever is more than the protection temperature of temperature protective device 6, fuse 61
Heat absorption, which disconnects, forms open circuit, cuts off circuit connection, and piezoresistor no longer heating power avoids insulation encapsulated layer from occurring smoldering very
To problem on fire.
Embodiment 2
As shown in figure 3, the present embodiment difference from example 1 is that: further include auxiliary lead 12, auxiliary lead 12
Upper end connect with the second conductive metal electrode 3 and (is welded by scolding tin 10 and the second conductive metal electrode 3 12 upper end of auxiliary lead).
When the overheat overvoltage protection piezoresistor accesses circuit, auxiliary lead 12 can be connected to LED light, to prompt overheat over-voltage
Whether protection piezoresistor is in normal operating conditions, is monitored to the state of overheat overvoltage protection piezoresistor.
Remaining structure of the present embodiment is same as Example 1.
Claims (8)
1. a kind of overheat overvoltage protection piezoresistor, including ceramic dielectric substrate, the first conductive metal electrode, the second conductive gold
Belong to electrode, first lead, the second lead and insulation encapsulated layer, the first conductive metal electrode, the second conductive metal electrode are set respectively
In on the two sides of ceramic dielectric substrate, it is characterized in that: the overheat overvoltage protection piezoresistor further includes temperature protection dress
It sets, temperature protective device includes fuse, insulation shell and two fuse pins, and fuse is set in insulation shell, and two
Fuse pin connect with fuse both ends respectively and extend out to outside insulation shell；First lead upper end and the first conductive metal
Electrode connection, the insulation shell of temperature protective device are attached on the second conductive metal electrode by thermal conductive adhesive layer, and one protects
Dangerous silk pin is connect with the second conductive metal electrode, and another fuse pin is connect with the second lead upper end；Insulating encapsulated layer will
Ceramic dielectric substrate, the first conductive metal electrode, first lead upper end, the second conductive metal electrode, temperature protective device and
Two lead upper ends are sealed, and first lead lower end and the second lead lower end are extend out to outside insulation encapsulated layer.
2. overheat overvoltage protection piezoresistor according to claim 1, it is characterized in that: the first lead upper end passes through
Scolding tin and the first conductive metal electrode weld；One fuse pin of temperature protective device passes through scolding tin and the second conductive metal electrode
Welding, another fuse pin of temperature protective device are welded by scolding tin and the second lead upper end.
3. overheat overvoltage protection piezoresistor according to claim 1, it is characterized in that: first conductive metal is electric
Pole, the second conductive metal electrode are silver electrode, copper electrode or nickel electrode.
4. overheat overvoltage protection piezoresistor according to claim 1, it is characterized in that: the fuse is existed by fusing point
Silk thread made of alloy within the scope of 160-220 DEG C.
5. overheat overvoltage protection piezoresistor according to claim 1, it is characterized in that: the insulation shell uses plastic cement
Material is made.
6. overheat overvoltage protection piezoresistor according to claim 1, it is characterized in that: the insulation encapsulated layer is using resistance to
The epoxy resin of high temperature is formed.
7. overheat overvoltage protection piezoresistor according to claim 1-6, it is characterized in that: the overheat over-voltage
Protecting piezoresistor further includes auxiliary lead, and auxiliary lead upper end is connect with the second conductive metal electrode.
8. overheat overvoltage protection piezoresistor according to claim 7, it is characterized in that: the auxiliary lead upper end passes through
Scolding tin and the second conductive metal electrode weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920471987.3U CN209625950U (en) | 2019-04-09 | 2019-04-09 | Overheat overvoltage protection piezoresistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920471987.3U CN209625950U (en) | 2019-04-09 | 2019-04-09 | Overheat overvoltage protection piezoresistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209625950U true CN209625950U (en) | 2019-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920471987.3U Active CN209625950U (en) | 2019-04-09 | 2019-04-09 | Overheat overvoltage protection piezoresistor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111237728A (en) * | 2020-02-14 | 2020-06-05 | 厦门普为光电科技有限公司 | Protection system for lamp tube |
| CN114141459A (en) * | 2021-12-25 | 2022-03-04 | 贵州凯里经济开发区中昊电子有限公司 | Over-temperature protection method and structure of nano-alloy electrode piezoresistor |
-
2019
- 2019-04-09 CN CN201920471987.3U patent/CN209625950U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111237728A (en) * | 2020-02-14 | 2020-06-05 | 厦门普为光电科技有限公司 | Protection system for lamp tube |
| CN114141459A (en) * | 2021-12-25 | 2022-03-04 | 贵州凯里经济开发区中昊电子有限公司 | Over-temperature protection method and structure of nano-alloy electrode piezoresistor |
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