CN102903468A - Overcurrent protection apparatus - Google Patents
Overcurrent protection apparatus Download PDFInfo
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- CN102903468A CN102903468A CN2011102083626A CN201110208362A CN102903468A CN 102903468 A CN102903468 A CN 102903468A CN 2011102083626 A CN2011102083626 A CN 2011102083626A CN 201110208362 A CN201110208362 A CN 201110208362A CN 102903468 A CN102903468 A CN 102903468A
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Abstract
The present invention provides an overcurrent protection apparatus, which comprises: a thermistor, wherein the thermistor comprises a thermosensitive material having a positive temperature coefficient characteristic; and a current heating unit, wherein the current heating unit is connected with the thermistor in series, and heats the thermistor in a heat conduction manner. Compared with the conventional overcurrent protection apparatus, the overcurrent protection apparatus of the present invention has the following characteristics that: an action time is significantly reduced, and especially when the overcurrent protection apparatus works at a low action current, the action time reduction is particularly significant; and the auxiliary current heating unit can heat the thermistor at the basically stable heating efficiency so as to reduce influence on the thermistor by the environment temperature, such that the action current change amplitude of the overcurrent protection apparatus can be small in a wide temperature range.
Description
Technical field
The present invention relates to technical field of electronic devices, more specifically, the present invention relates to a kind of overcurrent protective device.
Background technology
Thermistor is that a kind of resistance value varies with temperature and the resistance that changes.Difference according to temperature coefficient, thermistor is divided into positive temperature coefficient (Positive Temperature Coefficient usually, PTC) thermistor and negative temperature coefficient (Negative Temperature Coefficient, NTC) thermistor.Resistance value increased when the PTC thermistor raise in temperature, and NTC thermistor resistance value when temperature raises reduces.
Specifically, the ptc characteristics of PTC thermistor refers to, when temperature is elevated to Curie point (or transition temperature point) when above, the resistance value of PTC thermistor can be geometric progression to be increased; And when temperature was reduced to initial temperature (for example room temperature), the resistance value of PTC thermistor can return to close to the resistance value under the initial condition again.
This ptc characteristics of PTC thermistor can be used for overcurrent protection.After the PTC thermistor was connected place in circuit, the electric current that flows through this PTC thermistor made its heating, if the heating speed of thermistor surpasses rate of heat dispation, then the temperature of this thermistor can raise gradually.The resistance value of thermistor raises and corresponding increase along with temperature, this so that flow through that its electric current reduces gradually and final so that its be turned off, thereby realize overcurrent protection to circuit.Wherein, the time of PTC thermistor from the beginning heating direct to shutoff is called operate time.Yet because the heating speed of resistance is relevant with current value, in the less situation of fault current, the heating speed of over-current protection device is lower, and corresponding operate time is also longer.Meeting operate time that over-current protection device is long so that the electronic equipment that needs protection or circuit be operated under the fault current more longways, thereby affect over-flow protecting effect.
For the over-current protection device that adopts the PTC thermo-sensitive material, can the minimum current that surpass Curie temperature (or transition temperature point) be called operating current so that PTC thermistor self-heating heats up; And can be called the maintenance electric current so that the PTC thermistor maintains the maximum current that conducting state bears all the time.Because the PTC thermistor is for responsive to temperature, therefore, its maintenance/operating current curve has temperature reduction characteristic, and namely the operating current under the different temperatures, maintenance electric current there are differences.This can cause same fault current (it is normally so that the operating current that the PTC thermistor can automatically shut down) to differ greatly corresponding operate time.
Summary of the invention
Basic thought of the present invention is to utilize auxiliary heater to come the PTC thermistor is heated, and works in the programming rate of the PTC thermistor under the operating current with raising, thereby accelerates the shutoff action of PTC thermistor.
In order to address the above problem, according to an aspect of the present invention, provide a kind of overcurrent protective device, comprising: thermistor, it comprises the thermo-sensitive material with ptc characteristics; The current flow heats unit, itself and described thermistor are connected in series, and in heat conducting mode described thermistor are heated.
According to one embodiment of present invention, described current flow heats unit directly fits to described thermistor or fits to described thermistor by Heat Conduction Material.
According to one embodiment of present invention, described thermistor has the first electrode and the second electrode, and described current flow heats unit has third electrode and the 4th electrode, and described the second electrode is electrically connected with described third electrode.
According to one embodiment of present invention, described overcurrent protective device also comprises the first pin and the second pin, and described the first pin is used for described the first electrode electricity is drawn, and described the second pin is used for described the 4th electrode electricity is drawn.
According to one embodiment of present invention, described overcurrent protective device also comprises the 3rd pin, and described the 3rd pin is used for described the second electrode and described third electrode electricity are drawn.
According to one embodiment of present invention, described current flow heats unit comprises: heat generating components, and it is based on the electric current producing heat that flows through it; Substrate is used for supporting described heat generating components, extends along a side of described substrate to allow described heat generating components; And the third electrode and the 4th electrode that are positioned at described substrate both sides, be used for described heat generating components electricity is drawn, wherein, described third electrode and described heat generating components are positioned at the same side of described substrate, and described the 4th electrode is electrically connected with described heat generating components by the via hole that passes described substrate.
According to one embodiment of present invention, described current flow heats unit comprises: heat generating components, and it is based on the electric current producing heat that flows through it; Be positioned at third electrode and the 4th electrode of described heat generating components both sides, be used for described heat generating components electricity is drawn.
The current foldback circuit of the overcurrent protective device that comprises previous embodiment is provided according to a further aspect in the invention.
Than traditional over-current protection device, significantly reduce the operate time of overcurrent protective device of the present invention, and particularly when the overcurrent protective device was operated in less operating current, the minimizing of operate time was particularly evident.In addition; because auxiliary current flow heats unit can heat thermistor with the basicly stable efficiency of heating surface; so that ambient temperature reduces the impact of thermistor, this is so that the operating current amplitude of variation of overcurrent protective device of the present invention in larger temperature range is less.
Above characteristic of the present invention and other characteristics are partly set forth embodiment hereinafter clearly.
Description of drawings
Read following detailed description to non-limiting example by the reference accompanying drawing, can more easily understand features, objects and advantages of the invention.Wherein, same or analogous Reference numeral represents same or analogous device.
Fig. 1 shows the according to an embodiment of the invention module map of overcurrent protective device;
Fig. 2 shows according to the operate time of the overcurrent protective device of the embodiment of the invention of the curve with the action curent change;
Fig. 3 shows the temperature reduction curve according to thermistor operating current in the overcurrent protective device of the embodiment of the invention;
Fig. 4 a shows according to an embodiment of the invention overcurrent protective device;
Fig. 4 b shows according to another embodiment of the present invention overcurrent protective device;
Fig. 5 shows the circuit diagram of the overcurrent protective device that adopts Fig. 4 b;
Fig. 6 a to 6b shows the structural representation according to the overcurrent protective device of the embodiment of the invention;
Fig. 7 a to 7b shows the decomposition chart according to the overcurrent protective device of the embodiment of the invention;
Fig. 7 c shows the according to another embodiment of the present invention generalized section of current flow heats unit.
Embodiment
The below discusses enforcement and the use of embodiment in detail.Yet, should be appreciated that the specific embodiment of discussing only exemplarily illustrates enforcement and uses ad hoc fashion of the present invention, but not limit the scope of the invention.
Fig. 1 shows the according to an embodiment of the invention module map of overcurrent protective device 100.This overcurrent protective device 100 comprises thermistor 101 and current flow heats unit 102, wherein:
This thermistor 101 comprises the thermo-sensitive material with ptc characteristics;
This current flow heats unit 102 is connected in series with this thermistor 101, and heats to this thermistor 101 in heat conducting mode.
Particularly, when this overcurrent protective device 100 was linked in the circuit, the electric current meeting of the current flow heats of flowing through unit 102 was so that this current flow heats unit 102 produces heats and conduction to thermistor 101.Alternatively, current flow heats unit 102 can directly fit to thermistor 101; Perhaps fit to thermistor 101 to heat to thermistor 101 by Heat Conduction Material, this Heat Conduction Material for example is metal material or heat-conducting glue.
In the situation of electric current overload, namely overcurrent protective device 100 works in the scope of operating current, and the heat that current flow heats unit 102 provides is so that the temperature rising of this thermistor 101; Simultaneously, because current flow heats unit 102 is connected in series with thermistor, the electric current of current flowing heating unit 102 flows through thermistor 101 at least in part, and therefore, thermistor 101 itself also still can generate heat based on the electric current that flows through it.The heating of the self-heating of thermistor 101 and current flow heats unit 102 surpasses Curie temperature so that this thermistor 101 heats up, thereby causes the action of this thermistor 101.The over-current protection device that only comprises the PTC thermistor than routine; the overcurrent protective device 100 of present embodiment can be by 102 heating of current flow heats unit; thereby have heating rate faster and shorter operate time, it can be realized as soon as possible the shutoff of circuit and avoid circuit to be protected to continue to be in overload and break down.
In the situation that electric current does not overload, the heat that this current flow heats unit 102 provides can not cause the significantly increase of these thermistor 101 resistance values so that thermistor 101 heats up at least above Curie temperature, namely can not cause the action of thermistor 101.Be appreciated that, the rising of thermistor 101 temperature is relevant with the rate of heat dispation of the rate of heat addition of current flow heats unit 102 and thermistor 101, only the rate of heat addition in current flow heats unit 102 surpasses in the situation of thermistor 101 rates of heat dispation, and the temperature of thermistor 101 just can raise.Therefore, when working in less lower time of electric current, although current flow heats unit 102 still can generate heat based on electric current, because this heating speed is lower than the rate of heat dispation of thermistor 101, thermistor 101 can remain on lower resistance value and can not move.
Fig. 2 shows according to the operate time of the overcurrent protective device of the embodiment of the invention of the curve with the action curent change.Wherein, curve 201 be the operate time of overcurrent protective device in the embodiment of the invention with the curve of action curent change, curve 202 is that the operate time of the traditional over-current protection device that only comprises thermistor is with the curve of action curent change.
Can find out that than traditional over-current protection device, significantly reduce the operate time of the overcurrent protective device of the embodiment of the invention, particularly when the overcurrent protective device was operated in less operating current, the minimizing of operate time was particularly evident.This is because under than the little trick electric current, the self-heating speed of thermistor is lower, and under than the big-movement electric current, the self-heating speed of thermistor increases very fast.And the rate of heat addition of current flow heats unit is mainly determined by its impedance; With respect to the self-heating speed of thermistor, the rate of heat addition of current flow heats unit is relatively stable, and therefore, operating current is less, and the heating of current flow heats unit is more obvious on the impact of operate time.
Fig. 3 shows the temperature reduction curve according to thermistor operating current in the overcurrent protective device of the embodiment of the invention.Wherein, curve 301 is temperature variant curves of the operating current of overcurrent protective device in the embodiment of the invention, and curve 302 is temperature variant curves of operating current of the traditional over-current protection device that only comprises thermistor.
Can find out that than traditional over-current protection device, the operating current amplitude of variation of the overcurrent protective device of the embodiment of the invention is less.This is because the heat that the current flow heats unit provides is higher with respect to the impact of ambient temperature; and the rate of heat addition of current flow heats unit is basicly stable; main relevant with its resistance value; therefore this ambient temperature impact on the overcurrent protective device operating current that has been equivalent in fact weaken can keep preferably consistency in larger temperature range.
In actual applications; in order to improve better the current flow heats unit to the heating effect of thermistor; thermistor and current flow heats unit can be integrated in the same encapsulation, for example are integrated in same plastics or the ceramic package, and by pin the electrode of this overcurrent protective device are drawn.Fig. 4 a and 4b show respectively according to an embodiment of the invention overcurrent protective device 410 and 420.
Shown in Fig. 4 a and 4b, thermistor 401 has the first electrode 401a and the second electrode 401b, and current flow heats unit 402 has third electrode 402a and the 4th electrode 402b, wherein, this second electrode 401b is electrically connected with third electrode 402a, so that thermistor 401 is connected in series with current flow heats unit 402, and thermistor 401 is packaged in the same packaging part 403 with current flow heats unit 402.
In Fig. 4 a, overcurrent protective device 410 also comprises the first pin 404 and the second pin 405, and this first pin 404 is used for this first electrode 401a is drawn from packaging part 403 electricity, and the second pin 405 is used for the 4th electrode 402b is drawn from packaging part 403 electricity.In Fig. 4 b, overcurrent protective device 420 also comprises the 3rd pin 406 except the first pin 404 and the second pin 405, is used for this second electrode 401b and third electrode 402a are drawn from packaging part 403 electricity.Than the overcurrent protective device with two pins, the 3rd pin 406 is so that thermistor 401 can be detected to determine its electrology characteristic respectively with current flow heats unit 402.
In actual applications, overcurrent protective device 420 can also be with other form places in circuit.Fig. 5 namely shows a kind of circuit diagram of the overcurrent protective device that adopts Fig. 4 b.This circuit comprises overcurrent protective device, power supply 501, load 502, control module 503 and gate-controlled switch 504.Wherein, load 502 is connected in series with control module 503 and consists of the first branch road, and current flow heats unit 402 and the gate-controlled switch 504 of overcurrent protective device are connected in series and consist of the second branch road, and this first branch road is connected with place in circuit with the second branch circuit parallel connection.Wherein, this control module 503 is for detection of flowing through its size of current, and forms the switch that corresponding control signal is controlled gate-controlled switch 504 based on the difference of the current value that detects.This control module 503 can for example adopt the control element of microprocessor (MCU).
Particularly, in the circuit of Fig. 5, when the operating current of thermistor 401 during less than operating current, gate-controlled switch 504 is placed in off state, does not have current flowing in the second branch road, does not work in current flow heats unit 402, therefore, thermistor 401 can be by 402 heating of current flow heats unit; And when the operating current of thermistor 401 surpasses operating current, control module 503 provides so that its control signal of opening to gate-controlled switch 504, thereby so that the second branch road conducting, thereby current flow heats unit 402 work and heat to accelerate the programming rate of thermistor 401 to thermistor 401.
According to the difference of specific embodiment, overcurrent protective device of the present invention can adopt multiple encapsulating structure.Fig. 6 a-7c namely shows the various structural representations of overcurrent protective device of the present invention.
Shown in Fig. 6 a and 6b, this overcurrent protective device comprises thermistor 601 and current flow heats unit 602.Wherein, this thermistor 601 is tabular, and it comprises the thermo-sensitive material of one deck ptc characteristics, for example is polymer PTC thermo-sensitive material or ceramic PTC thermo-sensitive material.Current flow heats unit 602 is tabular, and it comprises heat generating components, for example is resistance material, and this heat generating components is based on the electric current producing heat that flows through it.Because thermo-sensitive material and resistance material are electric conducting material, it can directly fit to realize being electrically connected and hot link of thermistor 601 and current flow heats unit 602 mutually.Alternatively, between this two-layer thermo-sensitive material and resistance material, can also sandwich one deck heat-conductivity conducting material, for example metal material; Perhaps can add the nonconducting Heat Conduction Material of one deck realizing heat conduction therebetween, and in this Heat Conduction Material, embed conductive lead wire and realize being electrically connected of thermistor 601 and current flow heats unit 602.Need to prove, for the heat generating components in the current flow heats unit 602, it for example also can adopt perceptual device (for example inductance), semiconductor device (for example diode) or other by the device of current heating, should not limit its scope in concrete the application.
In the embodiment of Fig. 6 a, the first electrode of thermistor 601 and the 4th electrode of current flow heats unit 602 are drawn by first pin 603 in parallel and the second pin 604 respectively.And in the embodiment of Fig. 6 b, thermistor 601 is coated with the layer of metal layer as the first electrode (not shown) away from a side of current flow heats unit 602, current flow heats unit 602 is coated with another layer metal level as the 4th electrode away from a side of thermistor 601, and these two electrodes are drawn by the first terminal 605 and the second terminal 606 that are electrically connected with it respectively.
Structure shown in Fig. 6 a and Fig. 6 b is particularly suitable for having the overcurrent protective device of 2 pins, i.e. overcurrent protective device shown in Fig. 4 a 410.For the overcurrent protective device with 3 pins, i.e. overcurrent protective device shown in Fig. 4 b 420, owing to the second electrode and the third electrode of thermistor need to be drawn, therefore, its structure is also different, will describe in detail hereinafter.
Shown in Fig. 7 a and Fig. 7 b; this overcurrent protective device comprises thermistor 701 and current flow heats unit 702; this current flow heats unit 702 can directly fit on the thermistor 701; or fit on the thermistor 701 by Heat Conduction Material, to provide heat by heat conducting mode to thermistor 701.
Thermistor 701 comprises the thermo-sensitive material 711 of one deck ptc characteristics, and this thermo-sensitive material 711 for example is polymer PTC thermo-sensitive material or ceramic PTC thermo-sensitive material.In the present embodiment, this thermo-sensitive material 711 is tabular, and its both sides are coated with respectively one deck conductive layer 712, wherein, one end of each conductive layer 712 has a groove 713, so that this conductive layer 712 is separated into the 712a of first and the second portion 712b of electric isolation; Also be enclosed with respectively the first electrode 714 and the second electrode 715 at the two ends of this thermo-sensitive material 711, this first electrode 714 and the second electrode 715 are respectively applied to draw the 712a of first of a conductive layer 712.Like this, by the first electrode 714 and the second electrode 715, can form the electric field that is substantially perpendicular to thermo-sensitive material 711 between the two conductive layers 712, and form betwixt electric current.The structure that is appreciated that above-mentioned thermistor 701 only is example, and in actual applications, thermistor 701 can also adopt other thermo-sensitive materials and corresponding encapsulating structure, should not limit its scope.
Current flow heats unit 702 comprises: heat generating components 721, and it is based on the electric current producing heat that flows through it; Substrate 722 is used for supporting this heat generating components 721, extends along a side of substrate 722 to allow this heat generating components 721; And the third electrode 723 and the 4th electrode 724 that are positioned at these substrate 722 both sides, be used for these heat generating components 721 electricity are drawn, wherein, this third electrode 723 and this heat generating components 721 are positioned at the same side of substrate 722, and the 4th electrode 724 is electrically connected with this heat generating components 721 by the via hole 725 that passes this substrate 722.
In actual applications, this heat generating components 721 comprises resistive device, perceptual device or semiconductor device.In the embodiment of Fig. 7 a, this heat generating components 721 is resistive conductive lead wire, and it can adopt loop construction, and the width of this conductive lead wire, thickness and length can design based on the difference of actual needs.Especially, this heat generating components 721 and substrate 722 can adopt the structure of printed circuit board (PCB), can be used as at substrate 722 printing copper cash or other metal wires the conductive lead wire of heat generating components 721.Alternatively, in the described embodiment of Fig. 7 b, can cover carbon film at substrate 722 and form heat generating components.Correspondingly, third electrode 723 and the 4th electrode 724 can be the structure of pad, and wherein third electrode 723 can be by being electrically connected with the second electrode 715 of thermistor 701 such as modes such as welding.In addition, directly be electrically connected with thermistor 701 for fear of heat generating components 721, can cover insulating barrier at this heat generating components 721, wherein only expose third electrode 723.Preferably, this insulating barrier can adopt the more excellent material of heat conductivility, is beneficial to the heat conduction between current flow heats unit 702 and the thermistor 701.
Can be found out by the structure shown in Fig. 7 a and the 7b, can be by connecting (for example welding) pin at the second electrode 715, so that the second electrode 715 electricity are drawn, thereby form the structure of 3 pins; Perhaps can be on third electrode 723 welding pin, to draw the second electrode 715 and third electrode 723.The structure that it will be understood by those skilled in the art that Fig. 7 a and 7b both can form 3 pins, also was suitable for forming 2 pins so that required electrode electricity is drawn.
Fig. 7 c shows the according to another embodiment of the present invention generalized section of current flow heats unit.This current flow heats unit adopts the ceramic thick film technology, and its heat generating components 731 is thick-film resistor, and substrate 732 is ceramic substrate.In actual applications, this current flow heats unit can adopt the mode of thick film screen printing to form.
Particularly, a side of substrate 732 is formed with heat generating components 731, is specially the thick-film resistor body.These heat generating components 731 two ends electrically are connected with respectively the first interior electrode 735 and the second inner electrode 736, wherein, this first interior electrode 735 is electrically connected with the first surface electrode 739 of substrate 732 opposite sides by the via hole 737 that passes substrate 732, and this interconnective first interior electrode 735, via hole 737 and first surface electrode 739 have namely consisted of the 4th electrode of current flow heats unit; And this second inner electrode 736 is electrically connected with second electrode 738 on the heat generating components 731; wherein this second electrode 738 isolated with heat generating components 731 electricity by second protection layer 734 and a protective layer 733 of being positioned at successively under it, this second inner electrode 736 and second electrode 738 common third electrode that consist of the current flow heats unit.In actual applications, this protective layer 733, second protection layer 734 and second electrode 738 adopt the material with high thermal conductivity usually, are beneficial to the heat conduction between heat generating components 735 and the thermistor (not shown) on it.
Although in accompanying drawing and aforesaid description, illustrate in detail and described the present invention, should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The invention is not restricted to above-mentioned execution mode.
The those skilled in the art of those the art can be by research specification, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the execution mode of disclosure.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one " is not got rid of plural number.In the practical application of invention, the function of a plurality of technical characterictics of quoting during a part possibility enforcement of rights requires.Any Reference numeral in the claim should not be construed as the restriction to scope.
Claims (17)
1. an overcurrent protective device is characterized in that, comprising:
Thermistor, it comprises the thermo-sensitive material with ptc characteristics;
The current flow heats unit, itself and described thermistor are connected in series, and in heat conducting mode described thermistor are heated.
2. overcurrent protective device according to claim 1 is characterized in that, described current flow heats unit directly fits to described thermistor or fits to described thermistor by Heat Conduction Material.
3. overcurrent protective device according to claim 1 is characterized in that, described thermistor has the first electrode and the second electrode, and described current flow heats unit has third electrode and the 4th electrode, and described the second electrode is electrically connected with described third electrode.
4. overcurrent protective device according to claim 3; it is characterized in that; described overcurrent protective device also comprises the first pin and the second pin, and described the first pin is used for described the first electrode electricity is drawn, and described the second pin is used for described the 4th electrode electricity is drawn.
5. overcurrent protective device according to claim 4 is characterized in that, described overcurrent protective device also comprises the 3rd pin, and described the 3rd pin is used for described the second electrode and described third electrode electricity are drawn.
6. overcurrent protective device according to claim 1 is characterized in that, described current flow heats unit comprises:
Heat generating components, it is based on the electric current producing heat that flows through it;
Substrate is used for supporting described heat generating components, extends along a side of described substrate to allow described heat generating components; And
Be positioned at third electrode and the 4th electrode of described substrate both sides, be used for described heat generating components electricity is drawn, wherein, described third electrode and described heat generating components are positioned at the same side of described substrate, and described the 4th electrode is electrically connected with described heat generating components by the via hole that passes described substrate.
7. overcurrent protective device according to claim 6 is characterized in that, described heat generating components comprises resistive device, perceptual device or semiconductor device.
8. overcurrent protective device according to claim 6 is characterized in that, described substrate comprises printed circuit board (PCB) or ceramic substrate.
9. overcurrent protective device according to claim 8 is characterized in that, described substrate is printed circuit board (PCB), and described heat generating components comprises the resistance that is made of conductive lead wire or carbon film.
10. overcurrent protective device according to claim 9 is characterized in that, described heat generating components is coated with insulating material.
11. overcurrent protective device according to claim 8 is characterized in that, described substrate is ceramic substrate, and described heat generating components comprises thick-film resistor.
12. overcurrent protective device according to claim 1 is characterized in that, described current flow heats unit comprises:
Heat generating components, it is based on the electric current producing heat that flows through it;
Be positioned at third electrode and the 4th electrode of described heat generating components both sides, be used for described heat generating components electricity is drawn.
13. overcurrent protective device according to claim 12 is characterized in that, described current flow heats unit is tabular.
14. overcurrent protective device according to claim 13 is characterized in that, described thermistor be shaped as tabular.
15. overcurrent protective device according to claim 12 is characterized in that, described heat generating components comprises resistive device, perceptual device or semiconductor device.
16. overcurrent protective device according to claim 1 is characterized in that, described thermistor comprises polymer PTC thermo-sensitive material or ceramic PTC thermo-sensitive material.
17. a current foldback circuit comprises according to claim 1 to 16 each described overcurrent protective devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110208362.6A CN102903468B (en) | 2011-07-25 | Overcurrent protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110208362.6A CN102903468B (en) | 2011-07-25 | Overcurrent protective device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102903468A true CN102903468A (en) | 2013-01-30 |
| CN102903468B CN102903468B (en) | 2016-12-14 |
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| CN112822808B (en) * | 2019-11-18 | 2023-04-14 | 马勒国际有限公司 | Heating module |
| CN113727473A (en) * | 2021-11-02 | 2021-11-30 | 天津米瑞科新材料技术有限公司 | Embedded temperature control heating element, heating circuit and temperature control method |
| CN113727473B (en) * | 2021-11-02 | 2022-03-04 | 天津米瑞科新材料技术有限公司 | Embedded temperature control heating element, heating circuit and temperature control method |
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Address after: Minhang District Caohejing Development Zone of Shanghai City, Qinzhou road 201103 No. 307 Patentee after: Shanghai Li Tao Electronics Co., Ltd. Address before: Minhang District Caohejing Development Zone of Shanghai City, Qinzhou road 201103 No. 307 Patentee before: Raychem Electronics (Shanghai) Co., Ltd. |
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