CN110010317A - A kind of surge current protection element with low-temperature startup performance - Google Patents
A kind of surge current protection element with low-temperature startup performance Download PDFInfo
- Publication number
- CN110010317A CN110010317A CN201910198082.8A CN201910198082A CN110010317A CN 110010317 A CN110010317 A CN 110010317A CN 201910198082 A CN201910198082 A CN 201910198082A CN 110010317 A CN110010317 A CN 110010317A
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- Prior art keywords
- resistance
- temperature
- low
- current protection
- surge current
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- 230000017525 heat dissipation Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 7
- 230000007423 decrease Effects 0.000 abstract description 5
- 230000001629 suppression Effects 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 17
- 230000003647 oxidation Effects 0.000 description 17
- 238000007254 oxidation reaction Methods 0.000 description 17
- 239000011701 zinc Substances 0.000 description 17
- 229910052725 zinc Inorganic materials 0.000 description 17
- 239000000919 ceramic Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000028016 temperature homeostasis Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C1/00—Details
- H01C1/08—Cooling, heating or ventilating arrangements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01C—RESISTORS
- H01C13/00—Resistors not provided for elsewhere
- H01C13/02—Structural combinations of resistors
-
- 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
- H01C7/04—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 having negative temperature coefficient
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermistors And Varistors (AREA)
Abstract
The invention discloses a kind of surge current protection element with low-temperature startup performance; the element has the pin and resistance combination element at both ends; wherein resistance combination element includes at least one linear fixed resistance and at least one NTC thermistor; wherein the NTC thermistor and linear fixed resistance are in a manner of in parallel; the resistance value of NTC thermistor with temperature rise and decline, between linear fixed resistance and NTC thermistor with can heat exchange pattern connection.Using the solution of the present invention, the Low temperature start-ability of device can be greatly improved, the normal operating efficiency of inhibition surge capacity and device is not influenced simultaneously, and substantially reduce the structure complexity of Surge suppression element, expand the application range of power type thermal resistance, the overall performance of device is improved, there is very high practicability.
Description
Technical field
The invention belongs to field of electronic devices, and specifically a kind of surge current protection with low-temperature startup performance is first
Part.
Background technique
Circuit often generates bigger surge current in the moment of energization, and the protected mode of mainstream is using function at present
Rate type NTC thermistor inhibits surge current.But the problem of due to power-type NTC thermistor material property, it deposits
In low temperature, circuit normally starts work problem.If circuit be under very low low-temperature condition (such as -30 DEG C or less), due to
NTC thermistor is in low temperature, and resistance value can be than room temperature (such as the at 25 DEG C) manyfold that becomes larger (10 times or more), at this moment power-type
The resistance value of NTC thermistor is very big (resistance both end voltage drop is very big), will lead to circuit and has no idea to work normally.
Summary of the invention
To solve problem described above, the present invention develops a kind of surge current protection member with low-temperature startup performance
Part, the element is on the basis of pervious NTC thermistor, fixed resistance in parallel connection, passes through fixed electricity under low-temperature condition
Resistance forms Surge suppression, and as temperature increases, thermistor resistance value is reduced, the normal work of proof load.
Specifically, the invention adopts the following technical scheme:
A kind of surge current protection element with low-temperature startup performance, which is characterized in that the element has the pin at both ends
With resistance combination element, wherein resistance combination element includes at least one linear fixed resistance and at least one NTC thermistor,
Wherein the NTC thermistor and linear fixed resistance are in a manner of in parallel, temperature-sensitive electricity under the resistance value ratio room temperature of the fixed resistance
Resistance is big, but thermistor resistance value is small when than low temperature, and the resistance value of NTC thermistor rises with temperature and declined, linear fixed electricity
Resistance NTC thermistor between with can heat exchange pattern connect.
In one embodiment, in direct contact with each other between NTC thermistor and linear fixed resistance, and NTC temperature-sensitive
Anode pin and negative pin are shared between resistance and linear fixed resistance.
In another embodiment, it is not directly contacted between NTC thermistor and linear fixed resistance, and with thermally conductive
Spacer is separately.In another case, between NTC thermistor and linear fixed resistance with steel spring plate separately.Upper
It states in structure, is provided with radiator structure on interval body or steel spring plate.
In a more preferred embodiment, it wraps up outside the element with cabinet, there is heat dissipation regulating device on cabinet, in low temperature
When heat dissipation regulating device close, open heat dissipation regulating device according to radiating requirements when high temperature and reinforce heat dissipation.
In the application of the above element, it is preferable that the element is equipped with mounting base in two sides, and resistance has centre bore,
Each resistance is connected in series with bolt, is fixed with nut.
The present invention realizes device under low temperature by the way that linear fixed resistance is in parallel with thermistor, by fixed resistance
Normal starting, it is dexterously real by the way that the heat of fixed resistance is transmitted to the normal work that thermistor realizes device after starting
The raising of low-temperature startup performance is showed.Using the solution of the present invention, the Low temperature start-ability of device can be greatly improved, while not
The normal operating efficiency of inhibition surge capacity and device is influenced, and substantially reduces the structure complexity of Surge suppression element,
The application range for expanding power type thermal resistance improves the overall performance of device, has very high practicability.
Detailed description of the invention
Fig. 1 is the basic principle structure chart of element of the present invention；
Fig. 2 is the structure chart of a preferred embodiment of element of the present invention；
Fig. 3 is the structure chart of another preferred embodiment of element of the present invention；
Fig. 4 is the working principle diagram of element of the present invention.
In figure: 1, pin；2, thermistor；3, fixed resistance；4, radiator structure；5, screw rod；6, nut；7, it installs
Seat；8, thermally conductive interval body；9, steel spring plate.
Specific embodiment
Circuit works normally when in order to solve the problems, such as low temperature, and the solution of the present invention has used two resistance, and one is power
Type NTC thermistor, along with a fixed resistance in parallel, the resistance value of the fixed resistance needs to select than temperature-sensitive under room temperature
Resistance is big, but thermistor resistance value small resistance value when than low temperature, can just guarantee circuit in room temperature or low temperature shape in this way
It can be worked normally under condition.At room temperature, electric current is preferentially to flow through the lesser power-type NTC thermistor of resistance value, to protect
NTC thermistor is demonstrate,proved to the inhibiting effect of surge.And in low temperature, it is low since power-type NTC thermistor is influenced by low temperature
Resistance value is 10 times of room temperature resistance value or more when warm, and the resistance value of NTC thermistor is greater than the resistance value of fixed resistance, and electric current then can preferentially lead to
The lesser fixed resistance of resistance value is crossed, the resistance value of fixed resistance is can to guarantee the normal work of circuit.Fixed resistance is due to electricity
Flowing through for stream can generate a large amount of heat, and making fixed resistance, temperature rapid increase, and fixed resistance and thermistor are one
A entirety can also be such that the temperature of power-type NTC thermistor rises, and the resistance value of power-type NTC thermistor can reduce at this time.When
Its resistance value be reduced to it is lower than the resistance value of fixed resistance after, then electric current can be flowed through from power-type NTC thermistor again, make function
The resistance value of rate type NTC thermistor further decreases.The efficiency of circuit is improved, and reduces power consumption.
The material of fixed resistance is illustrated by taking liner oxidation zinc resistance as an example in the present invention there are many selection, but
It is it should be understood that other materials are also within the scope of the present invention the present invention is not limited to liner oxidation zinc resistance.And
Those skilled in the art it will be appreciated that so-called linear resistance be not it is fairly linear, only in certain voltage and temperature
Very little is fluctuated in range.Liner oxidation zinc resistance is a kind of more extensive material of current application, but other are with similar
The material of property, such as linear graphite resistance or carbon black composite material resistance, resistance alloys, high-power aluminum casing resistor etc.,
It should within protection scope of the present invention.
Technical solution of the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, this is a basic schematic diagram of element of the present invention.As shown, element of the invention uses NTC
The mode in parallel with linear fixed resistance 3 of thermistor 2, and two kinds of resistance realize common pin by pin 1.At low temperature,
NTC thermistor have very high resistance value, electric current preferentially passes through fixed resistance at this time, realize inhibit surge while but also
Device can normally start.Fixed resistance is used with thermistor and can be connected with each other in thermo-conducting manner, therefore fixed resistance
When passing through electric current, generated heat will be transmitted on thermistor, and thermistor temp increases to resistance decrease, finally
So that device can be with efficient operation under steady-state current.
Heat between two kinds of resistance is transmitted and can be realized as shown in Figure 1 by directly contacting, can also be by other more
It is realized for complicated mode.
Fig. 2 and Fig. 3 is the structural schematic diagram of two kinds of preferred embodiments respectively.To be easily installed, resistance flake products knot
Structure is generally in the following way: power-type NTC thermistor 2 and liner oxidation zinc resistance 3 all add center using identical disk
The structure in hole carries out two or three or more power-type NTC thermistor and liner oxidation zinc resistance side by side, two or three
A or more resistance disk is fixed by a fixing axle of centre bore, such as the shape of screw rod as shown in the figure 5 and nut 6
Across pass foot is added using ceramic insulating layer in the centre of formula, two resistance, to achieve the purpose that resistor body parallel connection.
Ceramic insulating layer among two resistance should preferably have the capacity of heat transmission.In situations where it is preferred, in this part
It should be provided with radiator structure 4, which can be used to the heat of regulating element entirety, guarantee the normal work of element, or
Person is used to the temperature of regulating element entirety as needed, realizes desired performance.
In one embodiment, the thermally conductive interval body 8(of ceramic insulation such as 95% aluminium oxide ceramics is used between two resistance
And other similar materials) separately, radiator structure 4 is preferably provided on interval body, radiator structure can be ceramic insulation and dissipate
The advantages of backing, heat radiating fin structure, is to divulge information, and integrated environment heat can be adjusted by divulging information, and realizes more effective
Environment temperature control.
In another embodiment, intermediate spacer structure is steel spring plate 9, and ceramic insulation is arranged in steel spring plate two sides
As radiator structure, steel spring plate can use it and elastically keeps being connected firmly and fixing for each component cooling fin, while have again
There is certain elasticity.Because resistance chip can generate certain oscillation at work, elastic connection helps to guarantee the work of component
Make the service life.
The working principle of element of the present invention is illustrated in Fig. 4.The change in resistance of component is as shown, such as power-type
NTC thermistor R25Resistance value be 5 Ω, B value is 3000K, R-30When resistance value be 50 Ω (wherein R refer to resistance, subscript instruction
Temperature, unit are degree Celsius therefore R25Resistance value when being 25 DEG C, R-30Resistance value when being -30 DEG C), the resistance value of fixed resistance selects 15
Ω, the then all-in resistance of the component are as follows:
(1) R25Always=(R1*R2)/(R1+R2)=(5*15)/(5+15)=3.75(Ω)；
(2) R-30Always=(R1*R2)/(R1+R2)=(50*15)/(50+15) ≈ 11.54(Ω).
When at low temperature, although the resistance value of thermistor is very big, due to the presence of fixed resistance, overall resistance is still
It can guarantee that device can smoothly start.As fixed resistance generates heat, heat is transmitted to thermistor and thermistor is heated up,
Then thermistor resistance decrease, finally drop to it is sufficiently low in the case where, electric current then preferentially by thermistor, realization device
Efficiency operation.
It will be appreciated that although the example provided in figure uses the combination or one of a fixed resistance and a thermistor
The combination of a thermistor and two fixed resistances, but principle according to the present invention, can be using the heat with different number
The combination of quick resistance and fixed resistance, and the resistance value of each resistance can be optimized to realize different performances.Citing comes
It says, the building form of component can form one as follows, and only there are two the components of pin: 1) using a power-type NTC temperature-sensitive electricity
Resistance plus a liner oxidation zinc ceramics fixed resistance；2) two liner oxidation zinc potteries are added using a power-type NTC thermistor
Porcelain fixed resistance；3) add a liner oxidation zinc ceramics fixed resistance using two power-type NTC thermistors；4) using more
Power-type NTC thermistor add more liner oxidation zinc ceramics fixed resistances.
The appearance of the component changes the low temperature for needing to guarantee using two, three or more elements device originally
The case where starting ability.Now only need using an element, the volume of element can be greatly reduced, reach simplify and reduce it is whole
The effect of a circuit.Meanwhile power type thermal resistance and liner oxidation zinc ceramics fixed resistance absorb the ability of surge current very
Greatly, it can achieve often vertical centimetre/60 joules of ability, to ensure that entire component inhibits the reliability of surge.
The component has the characteristics that flexible structure, and the power-type NTC thermistor that different number can be used adds liner oxidation
Zinc ceramics fixed resistance is overlapped, therefore can be combined according to different application requirements, is reached final and is realized that difference is answered
With desired purpose.It is further illustrated below with specific use of the specific embodiment to invention components.
Example one: can using a liner oxidation zinc ceramics fixed resistance, for example (resistance value can be according to circuit by 15 Ω of resistance value
Carry out select, such as 5 Ω, 10 Ω, 20 Ω) a plus power-type NTC thermistor such as resistance value R25: 5 Ω, B value:
3000K, R-30: (parameter can be selected 50 Ω, such as R25: 10 Ω, B value: 3000K, R-30:100Ω；R25: 20 Ω, B value:
3200K, R-30: 220 Ω etc.) carry out parallel connection.
Working principle: in low temperature (such as -30 DEG C), electric current first passes through the lesser fixed resistance of resistance value, and fixed resistance exists
It under the action of electric current, generates heat and heats up, thermistor and fixed resistance are an entirety, and heat can also be transmitted to thermistor
On, increase the temperature of thermistor, when the resistance decrease of thermistor is to (15 Ω) smaller than fixed resistance, electric current again can be from
Pass through on thermistor, at this moment thermistor continues to generate heat under the continuing through of electric current, the resistance value of final thermistor can under
Very low (0.1 Ω or so, only 1/the tens of room temperature resistance value) is dropped to, therefore power consumed by the component also can be very
It is small, improve the efficiency of entire circuit.
Example two: on one basis of example, increasing a liner oxidation zinc ceramics fixed resistance, the two fixed resistances it
Between can couple in parallel or in series.
Working principle: the places different from example one are, due to using two liner oxidation zinc fixed resistances, so fixed
The through-current capability of resistance can be improved one times；The through-current capability of entire component can be greatly improved in this way.
Example three: on the basis of example one or example three, increasing a power-type NTC thermistor, two thermistors it
Between can couple in parallel or in series.
Working principle: the places different from example one are, due to using two power-type NTC thermistors, so temperature-sensitive
The through-current capability of resistance can be improved one times, can greatly improve the through-current capability of entire component in this way.
Example four: on the basis of example one, by increasing power-type NTC thermistor and the fixed electricity of liner oxidation zinc ceramics
The quantity of resistance, can in parallel or in series between thermistor, can be in parallel or in series between fixed resistance.
Working principle: due to using more thermistors and fixed resistance, the through-flow energy of entire component can be greatly improved
Power.
For the component due to being encapsulated without using insulating materials, power-type NTC thermistor and fixed resistance are all made of pottery
Ceramic material, the electrode of two resistance use silver electrode, and pin uses pure copper material, and the whole temperature resistant capability of component also obtains very big
It is promoted.Maximum operating temperature can achieve 400 DEG C, considerably beyond 200 DEG C of thermistor maximum operating temperature common of ability,
The through-current capability of subassembly product so also greatly improves, and can achieve hundreds of amperes.Can be widely used in needs work to exist
In high-power technical grade circuit under low-temperature condition, as the protection element for inhibiting surge.
Product structure: power-type NTC thermistor and liner oxidation zinc resistance all add centre bore using identical disk
Structure carries out two or three or more power-type NTC thermistor and liner oxidation zinc resistance side by side, two or three or
More resistance disks are fixed by a fixing axle of centre bore, and the centre of two resistance is added using ceramic insulating layer
Across path electrode, to achieve the purpose that resistor body parallel connection.In situations where it is preferred, shell can be added in entire component external,
The mechanisms such as thermoregulation mechanism, such as hygrosensor, shutter, fan are set on shell, these mechanisms can be according to heat dissipation
It needs to be adjusted, such as closes shutter so that environment temperature rises as early as possible, or works as and reach when needing to keep the temperature
Fan is opened when certain temperature needs to radiate is aerated heat dissipation.
Embodiments of the present invention are described in detail above in conjunction with the drawings and specific embodiments, but the present invention is not
Be limited to above embodiment, technical field those of ordinary skill within the scope of knowledge, can also not depart from
It is made a variety of changes under the premise of present inventive concept.
Claims (8)
1. a kind of surge current protection element with low-temperature startup performance, which is characterized in that the element has drawing for both ends
Foot and resistance combination element, wherein resistance combination element includes at least one linear fixed resistance and at least one NTC temperature-sensitive electricity
Resistance, wherein the NTC thermistor and linear fixed resistance be in a manner of parallel connection, temperature-sensitive under the resistance value ratio room temperature of the fixed resistance
Resistance is big, but thermistor resistance value is small when than low temperature, and the resistance value of NTC thermistor rises with temperature and declined, linear fixed
Between resistance and NTC thermistor with can heat exchange pattern connection.
2. as described in claim 1 with the surge current protection element of low-temperature startup performance, which is characterized in that NTC temperature-sensitive
It is in direct contact with each other between resistance and linear fixed resistance, and anode is shared between NTC thermistor and linear fixed resistance
Pin and negative pin.
3. as described in claim 1 with the surge current protection element of low-temperature startup performance, which is characterized in that NTC temperature-sensitive
It is not directly contacted between resistance and linear fixed resistance, and separately with thermally conductive interval body.
4. as claimed in claim 3 with the surge current protection element of low-temperature startup performance, which is characterized in that on interval body
It is provided with radiator structure.
5. as described in claim 1 with the surge current protection element of low-temperature startup performance, which is characterized in that NTC temperature-sensitive
Between resistance and linear fixed resistance separately with steel spring plate.
6. as claimed in claim 5 with the surge current protection element of low-temperature startup performance, which is characterized in that steel spring plate
On be provided with radiator structure.
7. such as the surge current protection element described in any one of claims 1 to 6 with low-temperature startup performance, feature exists
In being wrapped up outside, the element with cabinet, there is heat dissipation regulating device on cabinet, the regulating device that radiates in low temperature is closed, high temperature
When according to radiating requirements open heat dissipation regulating device reinforce heat dissipation.
8. such as the surge current protection element described in any one of claims 1 to 6 with low-temperature startup performance, feature exists
In the element is equipped with mounting base in two sides, and resistance is had centre bore, is connected in series each resistance with bolt, with nut
It is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910198082.8A CN110010317B (en) | 2019-03-15 | 2019-03-15 | Surge current protection element with low-temperature starting performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910198082.8A CN110010317B (en) | 2019-03-15 | 2019-03-15 | Surge current protection element with low-temperature starting performance |
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| Publication Number | Publication Date |
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| CN110010317A true CN110010317A (en) | 2019-07-12 |
| CN110010317B CN110010317B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080013497A (en) * | 2006-08-09 | 2008-02-13 | 현대자동차주식회사 | Start motor driving device |
| CN103427783A (en) * | 2012-05-21 | 2013-12-04 | 上海晨兴希姆通电子科技有限公司 | Impedance matching circuit of thermistor and construction method thereof |
| CN203368015U (en) * | 2013-07-18 | 2013-12-25 | 江苏省黑马高科技发展有限责任公司 | A surge inhibition current protective device |
| CN207706033U (en) * | 2018-01-04 | 2018-08-07 | 亚荣源科技（深圳）有限公司 | Power supply circuit with temperature compensation function |
| CN209675025U (en) * | 2019-03-15 | 2019-11-22 | 南京时恒电子科技有限公司 | A kind of surge current protection element with low-temperature startup performance |
-
2019
- 2019-03-15 CN CN201910198082.8A patent/CN110010317B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080013497A (en) * | 2006-08-09 | 2008-02-13 | 현대자동차주식회사 | Start motor driving device |
| CN103427783A (en) * | 2012-05-21 | 2013-12-04 | 上海晨兴希姆通电子科技有限公司 | Impedance matching circuit of thermistor and construction method thereof |
| CN203368015U (en) * | 2013-07-18 | 2013-12-25 | 江苏省黑马高科技发展有限责任公司 | A surge inhibition current protective device |
| CN207706033U (en) * | 2018-01-04 | 2018-08-07 | 亚荣源科技（深圳）有限公司 | Power supply circuit with temperature compensation function |
| CN209675025U (en) * | 2019-03-15 | 2019-11-22 | 南京时恒电子科技有限公司 | A kind of surge current protection element with low-temperature startup performance |
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