CN109980619A - A kind of surge current protection element for frequent starting device - Google Patents
A kind of surge current protection element for frequent starting device Download PDFInfo
- Publication number
- CN109980619A CN109980619A CN201910198091.7A CN201910198091A CN109980619A CN 109980619 A CN109980619 A CN 109980619A CN 201910198091 A CN201910198091 A CN 201910198091A CN 109980619 A CN109980619 A CN 109980619A
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- Prior art keywords
- resistance
- maker
- surge current
- current protection
- starting device
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- 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.)
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- 230000005611 electricity Effects 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 229910000639 Spring steel Inorganic materials 0.000 claims 1
- 230000001629 suppression Effects 0.000 abstract description 7
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 10
- 229910052725 zinc Inorganic materials 0.000 description 10
- 239000011701 zinc Substances 0.000 description 10
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 206010037660 Pyrexia Diseases 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 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
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- 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
- H01C7/13—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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Thermistors And Varistors (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of surge current protection elements for frequent starting device; it is characterized in that; the element has pin, resistive element and maker; resistive element and maker are connected with parallel way; resistive element includes NTC thermistor; the resistance value of NTC thermistor rises with temperature and is declined, and maker is controlled by the heat of resistance combination element and connected.Surge current protection element of the invention, which can be realized, keeps efficient Surge suppression ability in circuit frequent starting.
Description
Technical field
The invention belongs to field of electronic devices, and specifically a kind of surge current protection for frequent starting device 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 in the case where frequent starting, due to power-type NTC temperature-sensitive electricity
The problem of hindering material property, it is difficult to be restored to initial cryogenic in a short time, thus Surge suppression effect cannot be played well.
And resistance value under low temperature due to thermistor material is excessive causes the normal difficulty in starting of circuit.
Summary of the invention
To solve problem described above, the present invention develops a kind of surge current protection member for frequent starting device
Part, on the basis of pervious NTC thermistor, maker in parallel connection is formed under low-temperature condition by resistance the element
Surge suppression simultaneously guarantees that circuit normally starts, and maker is started to work when being increased to setting operating temperature with temperature, and electric current is logical
Maker is crossed, resistance is restored to room temperature or low temperature, is ready for Surge suppression next time.
Specifically, the invention adopts the following technical scheme:
A kind of surge current protection element for frequent starting device, which is characterized in that the element has pin, resistance member
Part and maker, resistive element and maker are connected with parallel way, and resistive element includes NTC thermistor, NTC thermistor
Resistance value rise with temperature and decline, maker controlled by the heat of resistance combination element and connected.
In one embodiment, between maker and resistive element with can heat exchange pattern connection.In another embodiment party
In formula, temperature sensor is provided near resistive element, maker is controlled by temperature sensor, is connect when the set temperature is reached
Logical device is connected.
In one embodiment, maker is memory metal chip maker, wherein one end of maker and resistive element
A pin be fixedly connected, when resistive element be powered generate heat reach set temperature when maker deform so that maker
The other end and resistive element another pin overlap joint to connecting circuit.
Preferably, resistive element is the resistance combination element being combined by NTC thermistor and linear fixed resistance, linearly
Between fixed resistance and NTC thermistor with can heat exchange pattern connection.In a more preferred embodiment, NTC thermistor
It is in direct contact with each other between linear fixed resistance, and common pin between NTC thermistor and linear fixed resistance.Another
It in one more preferred embodiment, is not directly contacted between NTC thermistor and linear fixed resistance, and with thermally conductive interval body phase
Interval.Further, radiator structure is provided on interval body.In a preferred embodiment, NTC thermistor and linear
Between fixed resistance separately with steel spring plate.Further, radiator structure is provided on steel spring plate.
In a further preferred embodiment, it wraps up outside resistance combination element with cabinet, on cabinet there is heat dissipation to adjust dress
It sets, the regulating device that radiates in low temperature is closed, and is opened heat dissipation regulating device according to radiating requirements when high temperature and is reinforced 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.
Surge current protection element of the invention can be realized keeps efficient surge to press down in circuit frequent starting
Ability processed realizes that the normal of device opens under low temperature by fixed resistance by being in parallel linear fixed resistance with thermistor
It is dynamic, by the way that the heat of fixed resistance is transmitted to the normal work that thermistor realizes device after starting, dexterously realize low
The raising of startup temperature performance.Using the solution of the present invention, the Low temperature start-ability of device can be greatly improved, while not influencing to press down
The normal operating efficiency of surge capacity processed and device, and the structure complexity of Surge suppression element is substantially reduced, it expands
The application range of power type thermal resistance improves the overall performance of device, has very high practicability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of surge current protection element of the invention；
Several configurations of the Memory Alloy metal piece of Fig. 2 to 4.
In figure: 1, bimetal leaf；2, contact；3, NTC thermistor；4, liner oxidation zinc fixed resistance；5, pin；6,
Interval body；7, cooling fin；8, mounting base；9, screw rod；10, bolt.
Specific embodiment
In order to solve the problems, such as the Surge suppression under circuit frequent starting, the present invention is on the basis of thermistor surge suppressor
On, increase the maker of a bimetallic sheet structure between the two pins of combined resistance element, carries out physics with former component
Connection, high temperature when former component operation, can be transmitted on maker than faster, and maker and original component are on circuit
It is parallel connection, forms a new component.
For the new component when powering on, maker is in open-circuit condition, and electric current flows through NTC thermistor and fixed electricity
Resistance, the component can effectively inhibit surge current, and NTC thermistor and fixed resistance are under the action of electric current, self-heating, temperature
Degree makes maker reach trigger condition, maker conducting by way of heat transfer.
In another embodiment, maker is controlled by the heat of resistive element in an indirect way, such as in resistance member
Part nearby installs a heat-sensitive sensor, and when reaching set temperature, heat-sensitive sensor passes the signal along to maker, maker
Connect circuit.
Since resistance is larger compared with maker for thermistor and fixed resistance, electric current can mainly flow through maker.It connects
Device uses more metal alloy films, and the resistance of itself is smaller, but still has certain resistance, when high current passes through, therefore also
It can generate heat, which can guarantee that maker is in the condition of high temperature, make maker always in an ON state.NTC temperature-sensitive
Resistance and fixed resistance are because resistance is big, and electric current is switched on device and bypasses, itself no longer generates heat.Temperature can be restored to initially
Normal temperature state, electric current in holddown when being once again powered up to surge current, especially short time can be well solved
The case where being connected again after turning off twice or repeatedly.When switch off current, maker, can be very short since thermal capacitance is very small
Open-circuit condition is restored in time, which can return to original state again, carry out standard for Surge suppression next time
It is standby.
The solution of the present invention is described in more detail below in conjunction with the drawings and specific embodiments.
Referring to Fig. 1, a maker in parallel between two pins 5 of resistor assembly.The bimetal leaf 1 one of maker
End is fixedly connected with pin, and the other end of bimetal leaf then forms contact 2.The material of bimetal leaf is memorial alloy, is usually touched
Point is not contacted with another pin of resistive element, is only reached certain temperature, is triggered the deformation of Memory Alloy metal piece,
The connection of another of contact and resistive element pin, causes the circuit of maker to be connected.
The origin of heat for causing bi-metal plate deformed is the heat generated when resistive element is powered.The effect of resistive element is
Inhibiting surge current, common material is NTC thermistor, and resistance is larger under this kind of resistance room temperature or low temperature, it can inhibit surge,
Then due to the fever of itself after energization, then resistance is reduced at an elevated temperature.In the present invention, NTC thermistor 3 produces
Raw heat can trigger the deformation of bimetal leaf, form the connection of maker.After maker is connected, due to the resistance of maker
Much smaller than thermistor, then the electric current passed through on thermistor reduces, and resistance heating is reduced, and enables thermistor gradually extensive
Room temperature is arrived again.And the temperature of maker is then kept by the fever of its own at this time.After power-off, maker itself also no longer generates heat,
Then bimetal leaf is restored to its original state.
In order to enhance the low-temperature startup performance of element of the present invention, in the solution of the present invention, further in NTC thermistor
Upper linear fixed resistance 4 in parallel.The resistance value of the fixed resistance needs selection bigger than thermistor under room temperature, but than low
Thermistor resistance value small resistance value when warm can just guarantee that circuit can normal work under room temperature or low-temperature condition in this way
Make.At room temperature, electric current is preferentially to flow through the lesser power-type NTC thermistor of resistance value, to guarantee NTC thermistor to wave
The inhibiting effect gushed.And in low temperature, since power-type NTC thermistor is influenced by low temperature, resistance value is room temperature resistance when low temperature
10 times of value or more, the resistance value of NTC thermistor is greater than the resistance value of fixed resistance, and electric current then can preferentially pass through the lesser fixation of resistance value
Resistance, the resistance value of fixed resistance are can to guarantee the normal work of circuit.Fixed resistance can be generated greatly due to flowing through for electric current
The heat of amount, making fixed resistance, temperature rapid increase, and fixed resistance and thermistor are an entirety, can also make power
The temperature of type NTC thermistor rises, and the resistance value of power-type NTC thermistor can reduce at this time.When its resistance value is reduced to than solid
Determine resistance resistance value it is lower after, then electric current can be flowed through from power-type NTC thermistor again, make power-type NTC thermistor
Resistance value further decrease.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.
Additionally, it is understood that the present invention in scheme, illustrates this hair by taking the parallel connection NTC thermistor of fixed resistance as an example
Bright scheme, but the program is only one of preferred embodiment, it is according to the description of front it is recognised that solid more than not
In the case where determining resistance, the solution of the present invention also can be achieved on the Inrush current restraining performance in the case of frequent starting.Cause
This, protection scope of the present invention should not be so limited to attached drawing, but be subject to the range of claims.
It should be noted that thermal capacity is also wanted since NTC thermistor and the volume of fixed resistance are compared with maker big many
It more than two orders of magnitude bigger than maker, is connect so NTC thermistor can be conducted to heat with fixed resister adstante febre
Logical device.And maker it is in the conductive state when, temperature influences the temperature of NTC themistor and fixed resistance very small.
The trigger condition of the maker is high temperature, and temperature can be set as 100 DEG C, 150 DEG C, 200 DEG C, 250 DEG C etc. (can be with
It is set according to use demand).High temperature be since electric current is by caused by NTC thermistor and fixed resistance, can also
Different temperature is corresponded to different electric currents, such as 25A, 50A, 100A in the case where the setting of corresponding resistance parameter
Deng (can be set according to demand).
Component of the invention due to installed additional maker relative to it is no install additional maker component can bring two it is excellent
Point:
1, for component of the invention when powering on, NTC thermistor and fixed resistance are that electric current is flowed through in the short time, when connecing
After logical device reaches the state of setting, electric current can mainly be passed through by maker, and thermistor and fixed resistance are due to being no longer flow through electricity
Stream, thermistor can become normal temperature state from hot, and the NTC thermistor of normal temperature state is original state, is that can compare
Surge current next time is inhibited well.Component of the invention in this way solves original component after a loss of power, needs certain
Time come (wait thermistor cooling time) the problem of recovery, therefore component of the invention can better conform to electricity
Source powers off the utilization being powered again in a short time.
2, component of the invention flows through electric current, maker due to being to turn on device when working normally compared with original component
Resistance than it is hot when NTC thermistor and fixed resistance all-in resistance it is small, electric current can be substantially reduced in this way and flowed through
Consumed power consumption when the component has the function that reduce power consumption and improves circuit efficiency.
To be easily installed, resistor disc product structure generally in the following way: power-type NTC thermistor 3 and linear oxygen
Change zinc resistance 4 and the structure of centre bore all added using identical disk, by two or three or more power-type NTC thermistor and
Liner oxidation zinc resistance carries out side by side, two or three or more resistance disk is consolidated by a fixing axle of centre bore
It is fixed, such as the form of screw rod as shown in the figure 9 and nut 10, the centre of two resistance is using ceramic insulating layer along with across pass
Foot, 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, which can be used to the heat of regulating element entirety, guarantee the normal work of element, or
For the temperature of regulating element entirety as needed, desired performance is realized.
In one embodiment, the thermally conductive interval body 6 of ceramic insulation is used separately between two resistance, preferably in interval body
On be provided with radiator structure, the advantages of radiator structure can be ceramic insulation cooling fin 7, heat radiating fin structure, is to divulge information,
Integrated environment heat can be adjusted by divulging information, and realize more effective environment temperature control.
In another embodiment, intermediate spacer structure is steel spring plate, 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.
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.
Fig. 2 to 4 further discloses the configuration of bimetal leaf.Different configurations has different heated and heat dissipation performances,
Also there is different deformation sensitive degree, can be selected according to the actual needs.
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 (10)
1. a kind of surge current protection element for frequent starting device, which is characterized in that the element has pin, resistance
Element and maker, resistive element and maker are connected with parallel way, and resistive element includes NTC thermistor, NTC temperature-sensitive electricity
The resistance value of resistance rises with temperature and is declined, and maker is controlled by the heat of resistance combination element and connected.
2. as described in claim 1 be used for frequent starting device surge current protection element, which is characterized in that maker with
Between resistive element with can heat exchange pattern connection.
3. being used for the surge current protection element of frequent starting device as described in claim 1, which is characterized in that in resistance member
Part is nearby provided with temperature sensor, and maker is controlled by temperature sensor, and maker is connected when the set temperature is reached.
4. being used for the surge current protection element of frequent starting device as claimed in claim 2, which is characterized in that maker is
Memory metal chip maker, wherein one end of maker is fixedly connected with a pin of resistive element, when resistive element is logical
Electricity generates maker when heat reaches set temperature and deforms, so that another pin of the other end of maker and resistive element is taken
It connects to connect circuit.
5. being used for the surge current protection element of frequent starting device as described in claim 1, which is characterized in that resistive element
For the resistance combination element being combined by NTC thermistor and linear fixed resistance, linear fixed resistance and NTC thermistor it
Between with can heat exchange pattern connection.
6. being used for the surge current protection element of frequent starting device as claimed in claim 5, which is characterized in that NTC temperature-sensitive
It is in direct contact with each other between resistance and linear fixed resistance, and common pin between NTC thermistor and linear fixed resistance.
7. being used for the surge current protection element of frequent starting device as claimed in claim 5, 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.
8. being used for the surge current protection element of frequent starting device as claimed in claim 7, which is characterized in that on interval body
It is provided with radiator structure.
9. being used for the surge current protection element of frequent starting device as claimed in claim 5, which is characterized in that NTC temperature-sensitive
Between resistance and linear fixed resistance separately with steel spring plate.
10. being used for the surge current protection element of frequent starting device as claimed in claim 9, which is characterized in that spring steel
Radiator structure is provided on plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910198091.7A CN109980619A (en) | 2019-03-15 | 2019-03-15 | A kind of surge current protection element for frequent starting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910198091.7A CN109980619A (en) | 2019-03-15 | 2019-03-15 | A kind of surge current protection element for frequent starting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109980619A true CN109980619A (en) | 2019-07-05 |
Family
ID=67079018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910198091.7A Pending CN109980619A (en) | 2019-03-15 | 2019-03-15 | A kind of surge current protection element for frequent starting device |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2152301Y (en) * | 1993-05-05 | 1994-01-05 | 田惠民 | Heat compensate refrigerator over-current over-temperature rise double protector |
| CN201355596Y (en) * | 2009-01-20 | 2009-12-02 | 杨宽让 | Energy-saving high-current low power consumption negative temperature coefficient component |
| CN102082430A (en) * | 2011-01-27 | 2011-06-01 | 广州金升阳科技有限公司 | Surge suppression circuit |
| CN106131994A (en) * | 2016-06-22 | 2016-11-16 | 浙江阳光美加照明有限公司 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
| CN108879642A (en) * | 2018-07-12 | 2018-11-23 | 成都铁达电子股份有限公司 | The surge protection circuit and surge protective device of high safety |
| CN209675930U (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 for frequent starting device |
-
2019
- 2019-03-15 CN CN201910198091.7A patent/CN109980619A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2152301Y (en) * | 1993-05-05 | 1994-01-05 | 田惠民 | Heat compensate refrigerator over-current over-temperature rise double protector |
| CN201355596Y (en) * | 2009-01-20 | 2009-12-02 | 杨宽让 | Energy-saving high-current low power consumption negative temperature coefficient component |
| CN102082430A (en) * | 2011-01-27 | 2011-06-01 | 广州金升阳科技有限公司 | Surge suppression circuit |
| CN106131994A (en) * | 2016-06-22 | 2016-11-16 | 浙江阳光美加照明有限公司 | A kind of LEDbulb lamp circuit of Linear temperature control protection |
| CN108879642A (en) * | 2018-07-12 | 2018-11-23 | 成都铁达电子股份有限公司 | The surge protection circuit and surge protective device of high safety |
| CN209675930U (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 for frequent starting device |
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