CN102903468B - Overcurrent protective device - Google Patents
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- CN102903468B CN102903468B CN201110208362.6A CN201110208362A CN102903468B CN 102903468 B CN102903468 B CN 102903468B CN 201110208362 A CN201110208362 A CN 201110208362A CN 102903468 B CN102903468 B CN 102903468B
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Abstract
The invention provides a kind of overcurrent protective device, including: critesistor, it thermo-sensitive material including there is ptc characteristics；Electric current heating unit, it is connected in series with described critesistor, and heats described critesistor in thermo-conducting manner.Compared to traditional over-current protection device, substantially reducing the movement time of the overcurrent protective device of the present invention, particularly when overcurrent protective device is operated in less action current, the minimizing of movement time is particularly evident.In addition; owing to critesistor can be heated by the electric current heating unit of auxiliary with the basicly stable efficiency of heating surface; the impact of critesistor is reduced by ambient temperature, and this makes the overcurrent protective device of the present invention can be less in the action current amplitude of variation within the scope of bigger temperature.
Description
Technical field
The present invention relates to technical field of electronic devices, more particularly it relates to an mistake
Stream protection device.
Background technology
Critesistor is that a kind of resistance value varies with temperature and the resistance that changes.According to temperature system
The difference of number, critesistor is generally divided into positive temperature coefficient (Positive Temperature
Coefficient, PTC) critesistor and negative temperature coefficient (Negative Temperature
Coefficient, NTC) critesistor.PTC thermistor resistance value when temperature raises increases
Add, and NTC thermistor resistance value when temperature raises reduces.
Specifically, the ptc characteristics of PTC thermistor refers to, when temperature raises
Time more than Curie point (or transition temperature point), the resistance value meeting of PTC thermistor
Increase in geometrical progression；And when temperature is reduced to initial temperature (such as room temperature), PTC
The resistance value of critesistor can return to again the resistance value under original state.
This ptc characteristics of PTC thermistor may be used for overcurrent protection.At PTC
Critesistor is connected after access circuit, and the electric current flowing through this PTC thermistor makes it generate heat,
If the heating rate of critesistor exceedes rate of heat dispation, then the temperature of this critesistor can be gradually
Raise.The resistance value of critesistor raises along with temperature and increases accordingly, and this makes to flow through it
Electric current be gradually reduced and finally make it to be turned off, thus realize overcurrent protection to circuit.
Wherein, PTC thermistor from starting to warm up until the time turned off is referred to as movement time.So
And, owing to the heating rate of resistance is relevant to current value, in the case of fault current is less,
The heating rate of over-current protection device is relatively low, and corresponding movement time is the longest.Overcurrent protection
Device can make to need electronic equipment to be protected or circuit to work long movement time longlyer
Under fault current, thus affect overcurrent protection effect.
For using the over-current protection device of PTC thermo-sensitive material, it is possible to make PTC temperature-sensitive electricity
Resistance self-heating rises above the minimum current of Curie temperature (or transition temperature point) and is referred to as action electricity
Stream；And enable to PTC thermistor and maintain the maximum electricity that conducting state is born all the time
Stream is referred to as keeping electric current.Owing to PTC thermistor is sensitive for temperature, therefore, its holding/
Action current curve has temperature reduction characteristic, i.e. action current under different temperatures, holding
Electric current there are differences.This can cause same fault current, and (it is usually such that PTC temperature-sensitive
The action current that resistance can automatically shut down) differ greatly corresponding movement time.
Summary of the invention
The basic thought of the present invention is that PTC thermistor is entered by the heater utilizing auxiliary
Row heating, to improve the programming rate of the PTC thermistor worked under action current, from
And accelerate the shutoff action of PTC thermistor.
In order to solve the problems referred to above, cross stream according to an aspect of the invention, it is provided a kind of
Protection device, including: critesistor, it temperature-sensitive material including there is ptc characteristics
Material；Electric current heating unit, it is connected in series with described critesistor, and with the side of conduction of heat
Described critesistor is heated by formula.
According to one embodiment of present invention, described electric current heating unit directly fits to described
Critesistor or fit to described critesistor by Heat Conduction Material.
According to one embodiment of present invention, described critesistor has the first electrode and second
Electrode, described electric current heating unit has the 3rd electrode and the 4th electrode, described second electrode
Electrically connect with described 3rd electrode.
According to one embodiment of present invention, described overcurrent protective device also includes the first pin
With the second pin, described first pin for will described first electrode electricity extraction, and described the
Two pins are for drawing described 4th electrode electricity.
According to one embodiment of present invention, described overcurrent protective device also includes the 3rd pin,
Described 3rd pin is for drawing described second electrode and described 3rd electrode electricity.
According to one embodiment of present invention, described electric current heating unit includes: heat generating components,
It generates heat based on the electric current flowing through it；Substrate, is used for supporting described heat generating components, with
Described heat generating components is allowed to extend along the side of described substrate；And it is positioned at described substrate both sides
The 3rd electrode and the 4th electrode, for by described heat generating components electricity draw, wherein, described
3rd electrode and described heat generating components are positioned at the same side of described substrate, and described 4th electrode
By electrically connecting through the via of described substrate with described heat generating components.
According to one embodiment of present invention, described electric current heating unit includes: heat generating components,
It generates heat based on the electric current flowing through it；It is positioned at the 3rd electrode of described heat generating components both sides
With the 4th electrode, it is used for drawing described heat generating components electricity.
According to a further aspect in the invention, it is provided that include the overcurrent protection dress of previous embodiment
The current foldback circuit put.
Compared to traditional over-current protection device, during the action of the overcurrent protective device of the present invention
Between substantially reduce, particularly when overcurrent protective device is operated in less action current, dynamic
The minimizing making the time is particularly evident.Additionally, due to the electric current heating unit of auxiliary can be with base
Critesistor is heated by this stable efficiency of heating surface so that ambient temperature is to critesistor
Impact reduce, this makes the overcurrent protective device of the present invention within the scope of bigger temperature
Action current amplitude of variation is less.
Embodiment part hereinafter is carried out bright by above characteristic and other characteristics of the present invention
Really illustrate.
Accompanying drawing explanation
The following detailed description to non-limiting example is read by referring to accompanying drawing,
Features, objects and advantages of the invention can be more easily understood.Wherein, same or similar
Reference represent same or analogous device.
Fig. 1 shows the module map of overcurrent protective device according to an embodiment of the invention；
Fig. 2 shows that the movement time of overcurrent protective device according to embodiments of the present invention is servo-actuated
Make the curve of curent change；
Fig. 3 shows critesistor action in overcurrent protective device according to embodiments of the present invention
The temperature reduction curve of electric current；
Fig. 4 a shows overcurrent protective device according to an embodiment of the invention；
Fig. 4 b shows overcurrent protective device according to another embodiment of the present invention；
Fig. 5 shows the circuit diagram of the overcurrent protective device using Fig. 4 b；
Fig. 6 a to 6b shows that the structure of overcurrent protective device according to embodiments of the present invention is shown
It is intended to；
Fig. 7 a to 7b shows the decomposition knot of overcurrent protective device according to embodiments of the present invention
Composition；
Fig. 7 c shows the section signal of electric current heating unit according to another embodiment of the present invention
Figure.
Detailed description of the invention
Enforcement and the use of embodiment are discussed further below.It will be appreciated, however, that discussed
Specific embodiment be merely illustrative implement and use the present invention ad hoc fashion, and
Unrestricted the scope of the present invention.
Fig. 1 shows the module of overcurrent protective device 100 according to an embodiment of the invention
Figure.This overcurrent protective device 100 includes critesistor 101 and electric current heating unit 102,
Wherein:
This critesistor 101 includes the thermo-sensitive material with ptc characteristics；
This electric current heating unit 102 is connected in series with this critesistor 101, and with conduction of heat
Mode heat to this critesistor 101.
Specifically, when this overcurrent protective device 100 is linked in circuit, electricity is flowed through
The electric current of stream heating unit 102 can make this electric current heating unit 102 produce heat and conduct
To critesistor 101.Alternatively, electric current heating unit 102 can directly fit to temperature-sensitive electricity
Resistance 101；Or fit to critesistor 101 with heat sensitive resistance 101 by Heat Conduction Material
Heating, this Heat Conduction Material for example, metal material or heat-conducting glue.
In the case of current overload, i.e. overcurrent protective device 100 works in action current
In the range of, the heat that electric current heating unit 102 provides makes the temperature of this critesistor 101
Raise；Simultaneously as electric current heating unit 102 is connected in series with critesistor, flow through electricity
The electric current of stream heating unit 102 flows through critesistor 101, therefore, temperature-sensitive electricity at least in part
Resistance 101 remains on itself can generate heat based on the electric current flowing through it.Critesistor 101 from
The heating of heat and electric current heating unit 102 makes this critesistor 101 rise above Curie
Temperature, thus cause the action of this critesistor 101.PTC heat is only included compared to routine
The over-current protection device of quick resistance, the overcurrent protective device 100 of the present embodiment can be by electric current
Heating unit 102 heats, thus has faster heating rate and shorter movement time,
It can realize the shutoff of circuit as soon as possible and avoid circuit to be protected to be continuously in overload
And break down.
In the case of electric current does not overloads, the heat that this electric current heating unit 102 provides is at least
Critesistor 101 will not be made to rise above Curie temperature and cause this critesistor 101 electricity
Being significantly increased of resistance, i.e. will not cause the action of critesistor 101.It is appreciated that heat
The quick rising of resistance 101 temperature and the rate of heat addition of electric current heating unit 102 and temperature-sensitive electricity
The rate of heat dispation of resistance 101 is correlated with, and the only rate of heat addition at electric current heating unit 102 exceedes
In the case of critesistor 101 rate of heat dispation, the temperature of critesistor 101 just can raise.
Therefore, when working under less electric current, although electric current heating unit 102 still can be based on
Electric current and generate heat, but owing to this heating rate is less than the rate of heat dispation of critesistor 101,
Critesistor 101 can be maintained at relatively low resistance value without action.
Fig. 2 shows that the movement time of overcurrent protective device according to embodiments of the present invention is servo-actuated
Make the curve of curent change.Wherein, curve 201 is overcurrent protection dress in the embodiment of the present invention
The movement time put, curve 202 was traditional only to include heat with the curve of action curent change
The movement time of the over-current protection device of quick resistance is with the curve of action curent change.
It can be seen that compared to traditional over-current protection device, crossing of the embodiment of the present invention is flowed
The movement time of protection device substantially reduces, and is particularly operated in less when overcurrent protective device
Action current time, the minimizing of movement time is particularly evident.This is due at relatively little trick electricity
Flowing down, the self-heating rate of critesistor is relatively low, and under relatively big-movement electric current, critesistor
Self-heating rate increase very fast.And the rate of heat addition of electric current heating unit is mainly by its impedance certainly
Fixed；Relative to the self-heating rate of critesistor, the rate of heat addition of electric current heating unit is the most steady
Fixed, therefore, action current is the least, the heating of the electric current heating unit impact on movement time
The most obvious.
Fig. 3 shows critesistor action in overcurrent protective device according to embodiments of the present invention
The temperature reduction curve of electric current.Wherein, curve 301 is overcurrent protection in the embodiment of the present invention
The curve that the action current of device varies with temperature, curve 302 is traditional only to include temperature-sensitive
The curve that the action current of the over-current protection device of resistance varies with temperature.
It can be seen that compared to traditional over-current protection device, crossing of the embodiment of the present invention is flowed
The action current amplitude of variation of protection device is less.This is owing to electric current heating unit is provided
Heat higher relative to the impact of ambient temperature, and the rate of heat addition of electric current heating unit is
Basicly stable, the most relevant to its resistance value, this is substantially equivalent to weaken environment temperature
The degree impact on overcurrent protective device action current, therefore, it is possible within the scope of bigger temperature
Keep preferable concordance.
In actual applications, critesistor is added in order to preferably improve electric current heating unit
Thermal effect, critesistor and electric current heating unit can be integrated in same encapsulation, such as, collect
Become in same plastics or ceramic package, and by pin by the electrode of this overcurrent protective device
Draw.Fig. 4 a Yu 4b respectively illustrates overcurrent protective device according to an embodiment of the invention
410 and 420.
As shown in figures 4 a and 4b, critesistor 401 has the first electrode 401a and second electricity
Pole 401b, and electric current heating unit 402 has the 3rd electrode 402a and the 4th electrode 402b,
Wherein, this second electrode 401b and the 3rd electrode 402a electrical connection, so that critesistor
401 are connected in series with electric current heating unit 402, and critesistor 401 is single with electric current heating
Unit 402 is packaged in same packaging part 403.
In fig .4, overcurrent protective device 410 also includes the first pin 404 and the second pin
405, this first pin 404 is used for drawing this first electrode 401a from packaging part 403 electricity,
And the second pin 405 is for drawing the 4th electrode 402b from packaging part 403 electricity.At figure
In 4b, overcurrent protective device 420 is in addition to the first pin 404 and the second pin 405, also
Including the 3rd pin 406, it is used for this second electrode 401b and the 3rd electrode 402a from encapsulation
Part 403 electricity is drawn.Compared to having the overcurrent protective device of two pins, the 3rd pin 406
Critesistor 401 and electric current heating unit 402 is made to be detected to determine it respectively
Electrology characteristic.
In actual applications, overcurrent protective device 420 can also access circuit otherwise.
Fig. 5 i.e. shows a kind of circuit diagram of the overcurrent protective device using Fig. 4 b.This circuit
Including overcurrent protective device, power supply 501, load 502, control module 503 and controlled open
Close 504.Wherein, load 502 and control module 503 are connected in series composition the first branch road, mistake
The electric current heating unit 402 of stream protection device is connected in series composition second with gate-controlled switch 504
Branch road, this first branch road and the second branch circuit parallel connection connect to access circuit.Wherein, this control
Module 503 flows through its size of current for detection, and based on the current value detected not
The switch of gate-controlled switch 504 is controlled with the corresponding control signal of formation.This control module 503
Can be for example with the control element of microprocessor (MCU).
Specifically, in the circuit of Fig. 5, when the operating current of critesistor 401 is less than
During action current, gate-controlled switch 504 is placed in off state, does not flow through in the second branch road
Electric current, electric current heating unit 402 does not works, and therefore, critesistor 401 will not be by electric current
Heating unit 402 heats；And when the operating current of critesistor 401 exceedes action current,
Control module 503 provides to gate-controlled switch 504 and makes its control signal opened, so that
Obtain the second branch road conducting, thus electric current heating unit 402 work heat sensitive resistance 401 add
Heat is to accelerate the programming rate of critesistor 401.
According to the difference of specific embodiment, the overcurrent protective device of the present invention can use multiple
Encapsulating structure.Fig. 6 a-7c i.e. shows the various structural representations of overcurrent protective device of the present invention
Figure.
As shown in Fig. 6 a Yu 6b, this overcurrent protective device includes critesistor 601 and electric current
Heating unit 602.Wherein, this critesistor 601 is tabular, and it includes one layer of positive temperature
The thermo-sensitive material of coefficient feature, for example, polymer PTC thermo-sensitive material or ceramic PTC temperature-sensitive
Material.Electric current heating unit 602 is tabular, and it includes heat generating components, for example, resistance
Material, this heat generating components generates heat based on the electric current flowing through it.Due to thermo-sensitive material and electricity
Resistance material is conductive material, its can the most directly fit to realize critesistor 601 with
The electrical connection of electric current heating unit 602 and thermally coupled.Alternatively, at this two-layer thermo-sensitive material
And between resistance material, it is also possible to sandwich one layer of heat-conductivity conducting material, such as metal material；
Or one layer of nonconducting Heat Conduction Material can add to realize conduction of heat therebetween, and at this
Heat Conduction Material embeds conductive lead wire and realizes critesistor 601 and electric current heating unit 602
Electrical connection.It should be noted that for the heat generating components in electric current heating unit 602,
It can also use such as perceptual device (such as inductance), semiconductor device in a particular application
Part (such as diode) or other can should not limit its model by the device of current heating
Enclose.
In the embodiment of Fig. 6 a, the first electrode of critesistor 601 and electric current heating are single
4th electrode of unit 602 is respectively by first pin 603 and second in parallel
Pin 604 is drawn.And in the embodiment of Fig. 6 b, critesistor 601 heats away from electric current
The side of unit 602 is coated with layer of metal layer as the first electrode (not shown),
Electric current heating unit 602 is coated with another layer of metal level work away from the side of critesistor 601
Being the 4th electrode, the two electrode is respectively by the first terminal 605 that is connected electrically and the
Two-terminal 606 is drawn.
Fig. 6 a and the structure shown in Fig. 6 b are particularly suitable for the overcurrent protection dress with 2 pins
Put, i.e. overcurrent protective device 410 shown in Fig. 4 a.Stream guarantor is crossed for having 3 pins
Protection unit, i.e. overcurrent protective device 420 shown in Fig. 4 b, owing to needing critesistor
Second electrode and the 3rd electrode are drawn, and therefore, its structure is the most different, hereinafter
Will be explained in.
As shown in Fig. 7 a and Fig. 7 b, this overcurrent protective device includes critesistor 701 and electricity
Stream heating unit 702, this electric current heating unit 702 can directly fit to critesistor 701
On, or fit on critesistor 701 by Heat Conduction Material, in the way of by conduction of heat
Heat sensitive resistance 701 provides heat.
Critesistor 701 includes the thermo-sensitive material 711 of one layer of ptc characteristics, this temperature-sensitive
Material 711 for example, polymer PTC thermo-sensitive material or ceramic PTC thermo-sensitive material.In this reality
Executing in example, this thermo-sensitive material 711 is in tabular, and its both sides have been covered each by one layer of 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 Part I 712a and Part II 712b of electric isolation；
The first electrode 714 and the second electrode it is enclosed with the most respectively at the two ends of this thermo-sensitive material 711
715, this first electrode 714 and the second electrode 715 are respectively used to draw a conductive layer 712
Part I 712a.So, by the first electrode 714 and the second electrode 715, two-layer
The electric field being substantially perpendicular to thermo-sensitive material 711 can be formed between conductive layer 712, and
Form electric current therebetween.It is appreciated that the structure of above-mentioned critesistor 701 is merely illustrative,
In actual application, critesistor 701 can also use other thermo-sensitive materials and encapsulate accordingly
Structure, should not limit its scope.
Electric current heating unit 702 includes: heat generating components 721, and it is raw based on the electric current flowing through it
Become heat；Substrate 722, is used for supporting this heat generating components 721, to allow this heat generating components 721
Extend in side along substrate 722；And it is positioned at the 3rd electrode 723 of these substrate 722 both sides
With the 4th electrode 724, for this heat generating components 721 electricity is drawn, wherein, the 3rd electrode
723 are positioned at the same side of substrate 722 with this heat generating components 721, and the 4th electrode 724
By electrically connecting through the via 725 of this substrate 722 with this heat generating components 721.
In actual applications, this heat generating components 721 includes resistive elements, perceptual device or half
Conductor device.In the embodiment of Fig. 7 a, this heat generating components 721 is resistive conductive lead wire,
It can use loop construction, and the width of this conductive lead wire, thickness and length can be based on realities
The difference that border needs is designed.Especially, this heat generating components 721 is permissible with substrate 722
Use the structure of printed circuit board (PCB), copper cash or other metal wires can be printed on substrate 722
It is used as the conductive lead wire of heat generating components 721.Alternatively, in the embodiment described in Fig. 7 b,
Carbon film can be covered on substrate 722 and form heat generating components.Correspondingly, the 3rd electrode 723
Can be the structure of pad with the 4th electrode 724, wherein the 3rd electrode 723 can pass through example
As the modes such as welding electrically connect with the second electrode 715 of critesistor 701.Additionally, in order to
Heat generating components 721 is avoided directly to electrically connect with critesistor 701, can be at this heating part
Cover insulating barrier on part 721, the most only expose the 3rd electrode 723.Preferably, this insulating barrier
Heat conductivility preferably material can be used, be beneficial to electric current heating unit 702 and temperature-sensitive electricity
Conduction of heat between resistance 701.
By the structure shown in Fig. 7 a Yu 7b it can be seen that can pass through at the second electrode 715
Upper connection (such as welding) pin, to be drawn by the second electrode 715 electricity, thus forms 3
The structure of individual pin；Or can on the 3rd electrode 723 welding pin, to draw second
Electrode 715 and the 3rd electrode 723.It will be understood by those skilled in the art that Fig. 7 a's Yu 7b
Structure both can form 3 pins, is also suitably for forming 2 pins with by required electrode electricity
Draw.
Fig. 7 c shows the section signal of electric current heating unit according to another embodiment of the present invention
Figure.This electric current heating unit uses ceramic thick film technology, and its heat generating components 731 is thick film electricity
Resistance, and substrate 732 is ceramic substrate.In actual applications, this electric current heating unit is permissible
The mode using thick film screen printing is formed.
Specifically, the side of substrate 732 is formed with heat generating components 731, specially thick film electricity
Resistance body.These heat generating components 731 two ends the most electrically connect have first in electrode 735 and
Electrode 736 in two, wherein, this in first electrode 735 by the via through substrate 732
737 electrically connect with first electrode 739 of substrate 732 opposite side, and this is interconnective first years old
Interior electrode 735, via 737 and first electrode 739 i.e. constitute electric current heating unit
4th electrode；And this second inner electrode 736 and second electrode 738 on heat generating components 731
Electrical connection, wherein this second electrode 738 is by the second protection layer 734 being sequentially located under it
And a protective layer 733 electrically insulates with heat generating components 731, this second inner electrode 736 and
Two electrodes 738 collectively form the 3rd electrode of electric current heating unit.In actual applications,
This protective layer 733, second protection layer 734 and second electrode 738 generally use tool
There is the material of high thermal conductivity, be beneficial to heat generating components 735 and critesistor thereon (figure
Not shown in) between conduction of heat.
Although elaborating in the drawings and foregoing description and describing the present invention, it is considered that
This illustrates and describes is illustrative and exemplary rather than restrictive；The present invention is not
It is limited to above-mentioned embodiment.
The those skilled in the art of those the art can be by research description, disclosed
Content and accompanying drawing and appending claims, understand and implement the embodiment disclosed
Other change.In the claims, word " includes " element and the step being not excluded for other,
And wording " one " is not excluded for plural number.In the actual application of invention, a part can
The function of multiple technical characteristics cited in claim can be performed.Appointing in claim
What reference should not be construed as the restriction to scope.
Claims (16)
1. an overcurrent protective device, it is characterised in that including:
Critesistor, it thermo-sensitive material including there is ptc characteristics；
Electric current heating unit, it is connected in series with described critesistor, and described electric current adds
Hot cell directly fits to described critesistor or fits to described temperature-sensitive electricity by Heat Conduction Material
Resistance, thus in thermo-conducting manner described critesistor is heated；
Wherein, the rate of heat addition of described electric current heating unit is than the self-heating speed of described critesistor
Rate is stable.
Overcurrent protective device the most according to claim 1, it is characterised in that described heat
Quick resistance has the first electrode and the second electrode, and described electric current heating unit has the 3rd electrode
With the 4th electrode, described second electrode electrically connects with described 3rd electrode.
Overcurrent protective device the most according to claim 2, it is characterised in that described mistake
Stream protection device also includes the first pin and the second pin, and described first pin is for by described
First electrode electricity is drawn, and described second pin is for drawing described 4th electrode electricity.
Overcurrent protective device the most according to claim 3, it is characterised in that described mistake
Stream protection device also includes the 3rd pin, described 3rd pin for by described second electrode and
Described 3rd electrode electricity is drawn.
Overcurrent protective device the most according to claim 1, it is characterised in that described electricity
Stream heating unit includes:
Heat generating components, it generates heat based on the electric current flowing through it；
Substrate, is used for supporting described heat generating components, to allow described heat generating components along described base
Extend in the side of plate；And
It is positioned at the 3rd electrode and the 4th electrode of described substrate both sides, for by described heating part
Part electricity is drawn, and wherein, described 3rd electrode is positioned at the same of described substrate with described heat generating components
Side, and described 4th electrode is electric with described heat generating components by the via through described substrate
Connect.
Overcurrent protective device the most according to claim 5, it is characterised in that described
Thermal part includes resistive elements, perceptual device or semiconductor device.
Overcurrent protective device the most according to claim 5, it is characterised in that described base
Plate includes printed circuit board (PCB) or ceramic substrate.
Overcurrent protective device the most according to claim 7, it is characterised in that described base
Plate is printed circuit board (PCB), and described heat generating components includes the resistance being made up of conductive lead wire or carbon film.
Overcurrent protective device the most according to claim 8, it is characterised in that described
Thermal part is coated with insulant.
Overcurrent protective device the most according to claim 7, it is characterised in that described base
Plate is ceramic substrate, and described heat generating components includes thick-film resistor.
11. overcurrent protective devices according to claim 1, it is characterised in that described electricity
Stream heating unit includes:
Heat generating components, it generates heat based on the electric current flowing through it；
It is positioned at the 3rd electrode and the 4th electrode of described heat generating components both sides, for by described
Thermal part electricity is drawn.
12. overcurrent protective devices according to claim 11, it is characterised in that described
Electric current heating unit is tabular.
13. overcurrent protective devices according to claim 12, it is characterised in that described
Critesistor be shaped as tabular.
14. overcurrent protective devices according to claim 11, it is characterised in that described
Heat generating components includes resistive elements, perceptual device or semiconductor device.
15. overcurrent protective devices according to claim 1, it is characterised in that described heat
Quick resistance includes polymer PTC thermo-sensitive material or ceramic PTC thermo-sensitive material.
16. 1 kinds of current foldback circuits, including according to described in any one of claim 1 to 15
Overcurrent protective device.
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 CN102903468A (en) | 2013-01-30 |
| CN102903468B true CN102903468B (en) | 2016-12-14 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1565069A (en) * | 2001-10-03 | 2005-01-12 | 松下电器产业株式会社 | Electronic apparatus |
| JP3654730B2 (en) * | 1996-12-25 | 2005-06-02 | 矢崎総業株式会社 | Electric wire protection system using PTC |
| CN1848308A (en) * | 2005-03-28 | 2006-10-18 | 泰科电子有限公司 | Surface mount multi-layer electrical circuit protection device with active element between pptc layers |
| CN202307394U (en) * | 2011-07-25 | 2012-07-04 | 瑞侃电子(上海)有限公司 | Overcurrent protection device |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3654730B2 (en) * | 1996-12-25 | 2005-06-02 | 矢崎総業株式会社 | Electric wire protection system using PTC |
| CN1565069A (en) * | 2001-10-03 | 2005-01-12 | 松下电器产业株式会社 | Electronic apparatus |
| CN1848308A (en) * | 2005-03-28 | 2006-10-18 | 泰科电子有限公司 | Surface mount multi-layer electrical circuit protection device with active element between pptc layers |
| CN202307394U (en) * | 2011-07-25 | 2012-07-04 | 瑞侃电子(上海)有限公司 | Overcurrent protection device |
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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. |