CN209419208U - Surge protective device and electronic equipment - Google Patents
Surge protective device and electronic equipment Download PDFInfo
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- CN209419208U CN209419208U CN201920328066.1U CN201920328066U CN209419208U CN 209419208 U CN209419208 U CN 209419208U CN 201920328066 U CN201920328066 U CN 201920328066U CN 209419208 U CN209419208 U CN 209419208U
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Abstract
The utility model embodiment provides a kind of surge protective device and electronic equipment, surge protective device includes: EOS tube body and PN junction, first electrode, second electrode, input terminal electrode and grounding electrode in EOS tube body, and input terminal of the first electrode as PN junction, output end of the second electrode as PN junction, input terminal of the input terminal electrode as surge protective device；Fusing conductive part in EOS tube body, and fusing conductive part and PN junction are arranged between input terminal electrode and grounding electrode, and when temperature reaches the fusing point of fusing conductive part in EOS tube body, fusing conductive part occurs to melt so that breaking between input terminal electrode and grounding electrode.The conductive part that fuses when EOS tube body internal temperature is excessively high melts, to cut off the access between input terminal electrode and grounding electrode, input terminal electrode is avoided to be grounded, prevents security risk.
Description
Technical field
The utility model embodiment is related to electronic technology field, in particular to a kind of surge protective device and electronics are set
It is standby.
Background technique
Electronic product is frequently encountered unexpected current surge in use, impaired even so as to cause electronic product
Cause permanent destruction.Surge is the spike that a kind of rate of climb is fast and the duration is short, to the reliable of electronic product
The personal safety of property and user can bring damage.
In order to improve the reliability of electronic product and protect the personal safety of user, it usually needs to electronic equipment
Surge takes safeguard procedures.Existing market is that the surge protective device of mainstream is managed for EOS (electrical over stress),
When surge current in the normal range when, EOS pipe will not influence circuit normal work, when surge current exceed normal range (NR) when,
Surge current can be conducted to ground in a short time by EOS pipe, so that back-end circuit be protected not to be affected by surge, avoid surge electric
Stream damages circuit.
However, the existing reliability of electronic equipment with surge protective device is still to be improved.
Utility model content
The technical issues of the utility model solves, can not only will to provide a kind of surge protective device and electronic equipment
Surge current is conducted to ground, and safety problem caused by surge current can also be prevented excessive.
The utility model provides a kind of surge protective device, comprising: EOS tube body and be located at the EOS tube body in
PN junction, first electrode, second electrode, input terminal electrode and grounding electrode in the EOS tube body, and described
Input terminal of one electrode as the PN junction, output end of the second electrode as the PN junction, the input terminal electrode are made
For the input terminal of surge protective device；Fusing conductive part in the EOS tube body, and the fusing conductive part and institute
It states PN junction to be connected serially between the input terminal electrode and the grounding electrode, and works as temperature in the EOS tube body and reach described
When the fusing point of fusing conductive part, the fusing conductive part occurs to melt so that between the input terminal electrode and the grounding electrode
Open circuit.
The utility model also provides a kind of electronic equipment, including above-mentioned surge protective device.
Compared with prior art, technical solution provided by the embodiment of the utility model has the advantage that
The utility model provides a kind of superior surge protective device of structural behaviour, and fusing conductive part and PN junction are connected serially to
Between input terminal electrode and grounding electrode, when the surge current by surge protective device is in the PN junction receiving upper limit, PN junction
Play the role of being conducted to ground for surge current.When surge current is more than the PN junction receiving upper limit, PN junction is breakdown thus short-circuit,
It is short-circuit between input terminal electrode and grounding electrode, thus EOS tube body internal temperature rapid increase；When on tube body internal temperature
Fusing conductive part melts when rising to fusing conductive part fusing point, thus makes open circuit between input terminal electrode and grounding electrode, from
And solve the problems, such as input terminal electrode ground connection, avoid EOS tube body internal temperature continue rise and caused by security risk, and
Protect back-end circuit.
In addition, fusing conductive part is connected serially between first electrode and input terminal electrode, and second electrode is with grounding electrode
Same electrode, when temperature reaches fusing conductive part fusing point in EOS tube body, fusing conductive part melts, to cut off input terminal electricity
Access between pole and first electrode, thus input terminal electrode and grounding electrode disconnect, and input terminal electrode is avoided to be connected to the ground.
In addition, fusing conductive part is connected serially between second electrode and grounding electrode, and first electrode is with input terminal electrode
Same electrode, when temperature reaches fusing conductive part fusing point in EOS tube body, fusing conductive part melts, to cut off second electrode
Access between grounding electrode, thus input terminal electrode and grounding electrode disconnect, and input terminal electrode is avoided to be connected to the ground.
In addition, the quantity of fusing conductive part is two, the first fusing conductive part is connected serially to input terminal electrode and first electrode
Between, the second fusing conductive part is connected serially between second electrode and grounding electrode, and the first fusing conductive part and the second fusing are conductive
Dual fail-safe is played the role of in portion, guarantees that input terminal electrode disconnects in time with grounding electrode when EOS tube body internal temperature is excessively high.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element in attached drawing with same reference numbers label are expressed as similar element, remove
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the stereochemical structure perspective diagram for the surge protective device that the utility model first embodiment provides；
Fig. 2 is the corresponding equivalent circuit diagram of Fig. 1；
Fig. 3 is the part equivalent circuit diagram for the electronic equipment that the utility model first embodiment provides；
Fig. 4 is the stereochemical structure perspective diagram for the surge protective device that the utility model second embodiment provides；
Fig. 5 is the corresponding equivalent circuit diagram of Fig. 4；
Fig. 6 is the part equivalent circuit diagram for the electronic equipment that the utility model second embodiment provides；
Fig. 7 is the stereochemical structure perspective diagram for the surge protective device that the utility model 3rd embodiment provides；
Fig. 8 is the corresponding equivalent circuit diagram of Fig. 7.
Specific embodiment
It can be seen from background technology that the reliability of existing electronic equipment is still to be improved.
Analysis finds, breakdown inside EOS pipe to lead when surge current or DC voltage bear upper limit itself exceeding it
PN junction failure is caused, the positive and negative anodes of PN junction are by direct short-circuit, and the cathode of PN junction is grounded；Such as EOS pipe is used for the charging network of PCB
On, when the PN junction positive and negative anodes short circuit of EOS pipe, charging current can be shorted to ground by EOS pipe, will be generated greatly in charging
Heat burns out casting of electronic device, to cause serious security risk.
To solve the above problems, the utility model embodiment provides a kind of surge protective device, EOS tube body and it is located at
PN junction in the EOS tube body, first electrode, second electrode, input terminal electrode in the EOS tube body and connects
Ground electrode, and input terminal of the first electrode as the PN junction, output end of the second electrode as the PN junction, institute
State input terminal of the input terminal electrode as surge protective device；Fusing conductive part in the EOS tube body, and it is described molten
Disconnected conductive part and the PN junction are arranged between the input terminal electrode and the grounding electrode, and work as the EOS tube body
When interior temperature reaches the fusing point of the fusing conductive part, the fusing conductive part occurs to melt so that the input terminal electrode and institute
It states breaking between grounding electrode.The setting of fusing conductive part, so that cutting off input terminal electricity when EOS tube body internal temperature is excessively high
Access between pole and grounding electrode, prevent as input terminal electrode be grounded and caused by security risk, protect back-end circuit.
To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, below in conjunction with attached drawing to this
Each embodiment of utility model is explained in detail.However, it will be understood by those skilled in the art that practical new at this
In each embodiment of type, in order to make the reader understand this application better, many technical details are proposed.But even if without these
Technical detail and various changes and modifications based on following embodiment, also may be implemented the application technical side claimed
Case.
Fig. 1 is the stereochemical structure perspective diagram for the surge protective device that the utility model first embodiment provides.
With reference to Fig. 1, surge protective device provided in this embodiment includes: EOS tube body 100 and manages positioned at the EOS
PN junction (not shown) in ontology 100, first electrode 101, second electrode 102, input in the EOS tube body 100
Termination electrode 103 and grounding electrode, and input terminal of the first electrode 101 as the PN junction, the second electrode 102 are made
For the output end of the PN junction, input terminal of the input terminal electrode 103 as surge protective device；Positioned at the EOS pipe sheet
Fusing conductive part 105 in body 100, the fusing conductive part 105 and PN junction setting the input terminal electrode 103 with
It is described between the grounding electrode, and when temperature reaches the fusing point of the fusing conductive part 105 in the EOS tube body 100
The conductive part 105 that fuses occurs to melt so that breaking between the input terminal electrode 103 and the grounding electrode.
Surge protective device provided in this embodiment is described in detail below with reference to attached drawing.
Fusing conductive part 105 and PN junction are arranged between input terminal electrode 103 and grounding electrode, specifically, can go here and there
It is coupled between input terminal electrode 103 and grounding electrode, when the surge current by surge protective device is born in the upper limit in PN junction
When, fusing conductive part 105 plays the role of low-resistance, and PN junction, which is played, is conducted to ground for surge current.When surge current is more than
PN junction is breakdown thus short-circuit when the PN junction receiving upper limit, short-circuit between input terminal electrode 103 and grounding electrode, thus EOS pipe sheet
100 internal temperature rapid increase of body；When 100 internal temperature of EOS tube body rises to fusing 105 fusing point of conductive part, fusing is conductive
Portion 105 melts, thus makes open circuit between input terminal electrode 103 and grounding electrode, connects to solve input terminal electrode 103
The problem of ground, avoid 100 internal temperature of EOS tube body continue rise and caused by security risk, and protect back-end circuit.
In the present embodiment, the shape of the EOS tube body 100 is cuboid.In other embodiments, the EOS pipe sheet
The shape of body can also be square, ball or irregular shape.
The EOS tube body 100 prevents the first electrode 101, second electrode 102, input for providing sealed environment
Termination electrode 103, grounding electrode and fusing conductive part 105 aoxidize.For this purpose, in the present embodiment, the EOS tube body 100
It is interior to be filled with inert gas.In other embodiments, N can also be filled in the EOS tube body2。
In the present embodiment, 105 quantity of fusing conductive part is one, and described in the fusing conductive part 105 is connected serially to
Between first electrode 101 and the input terminal electrode 103, correspondingly, the second electrode 102 is same with the grounding electrode
Electrode.
When using surge protective device, the input terminal electrode 103 need to be accessed in the circuit of electronic equipment, and the ground connection
Electrode ground connection, for this purpose, the EOS tube body 100 exposes the input terminal electrode 103, and the EOS tube body 100 exposure
The grounding electrode out, i.e. EOSS tube body 100 expose second electrode 102.
The position of the first electrode 101, input terminal electrode 103 and grounding electrode, can be according to actual use demand
Any setting.
The material of the fusing conductive part 105 is one of copper, tin, aluminium or tungsten or a variety of.It is described molten in order to improve
The fusing ability of disconnected conductive part 105 guarantees that the fusing is led when 100 temperature of EOS tube body reaches fusing 105 fusing point of conductive part
Electric portion 105 can fuse in time, and the shape of the fusing conductive part 105 is Filamentous or column.
The fusing conductive part 105 has top and the bottom end opposite with the top, wherein top and bottom end are opposite
For 100 bottom of EOS tube body.In the present embodiment, 101 electricity of 105 bottom end of fusing conductive part and the first electrode
Connection, correspondingly, 105 top of fusing conductive part is electrically connected with the input terminal electrode 103.
In the present embodiment, in order to reduce influence of the fusing conductive part 105 to 101 position of first electrode, carrying out surge protection
Device further include: the third electrode (not shown) being fixed in EOS tube body 100, and third electrode is located at the fusing conduction
The top of the top end surface in portion 105, fusing conductive part 105 is electrically connected to the input terminal electrode 103 by the third electrode.
The third electrode can contact electrical connection with the input terminal electrode 103；Alternatively, surge protective device can be with
It include: the electric connection structure 106 in EOS tube body 100, described 106 one end of electric connection structure is electrically connected the third electricity
Pole, 106 other end of electric connection structure are electrically connected input terminal electrode 103.
In the present embodiment, electric connection structure 106 is conducting wire.In other embodiments, electric connection structure can also be conduction
Hole.
Surge protective device can also include: the 4th electrode (not shown) being fixed in EOS ontology 100, and the 4th is electric
Pole is located at the bottom end surface of the fusing conductive part 105, and the bottom end of fusing conductive part 105 is electrically connected to by the 4th electrode
The input terminal electrode 103.
Fig. 2 is the corresponding equivalent circuit diagram of Fig. 1, and input terminal electrode 103 accesses circuit input, second electrode 102 and connects
Ground electrode be grounded GND, and connect between input terminal electrode 103 and first electrode 101 fusing conductive part 105, first electrode 101 and
Series connection PN junction 10 between second electrode 102.
When surge current, which is less than PN junction 10, bears the upper limit, PN junction 10 is worked normally, and fusing conductive part 105 plays low-resistance
Effect guarantees that surge current can smoothly be conducted to ground GND by PN junction 10.When surge current is more than that PN junction 10 bears the upper limit
When, PN junction is breakdown thus fail, first electrode 101 and the short circuit of second electrode 102, on 100 internal temperature of EOS tube body is quick
It rises；When 100 internal temperature of EOS tube body rises to fusing 105 fusing point of conductive part, fusing conductive part 105 will occur to melt flat
It is flow to surrounding volume, thus the conductive part 105 that fuses is disconnected with the third electrode for being located at fusing 105 top of conductive part, that is to say, that
Conductive part 105 and the first electrode 101 of fusing disconnect, so that input terminal electrode 103 and second electrode 102 disconnect, due to the
Two electrodes 102 are same electrode with grounding electrode, so that breaking between input terminal electrode 103 and grounding electrode.As a result, may be used
With prevent the circuit high current by input terminal electrode 103 be conducted to ground GND, thus prevent 100 internal temperature of EOS tube body after
The security risk of continuous rising and generation.
It should be noted that the 105 top near zone of fusing conductive part is provided with accommodation space, fuse conductive part
105 melt after flow into accommodation space, guarantee fusing conductive part 105 melt after fuse conductive part 105 can be located at
The electrode of top end it is separated so that opening a way between input terminal electrode 103 and grounding electrode.
The melt temperature that the fusing conductive part 105 can be determined according to practical application request, that is, determine fusing conductive part
105 fusing point, for example, the melt temperature can be 100 DEG C, 120 DEG C etc.；According to the thawing temperature of the fusing conductive part 105
The material of degree and fusing conductive part 105 determines the thickness of the fusing conductive part 105, for example, the thawing of surge protective device
Temperature requirements be 100 DEG C, and fuse conductive part 105 be tin silk when, fusing conductive part 105 thickness be 0.1mm.
Therefore, it is possible to the surge protective device of different melt temperature characteristic specifications be set, to be suitable for different applied fields
Scape and occasion.
It should also be noted that, in other embodiments, fuse conductive part, input terminal electrode and the first electrode
Electrical connection may be arranged as: fusing conductive part bottom end be electrically connected with input terminal, correspondingly, fuse conductive part top and the
The electrical connection of one electrode.
Surge protective device provided in this embodiment not only has the function of being connected surge current extremely, and can also prevent
Only as surge protective device is breakdown and caused by the excessively high problem of surge protective device temperature, surge is anti-when the temperature is excessively high
It protects and forms open circuit between the input terminal electrode and grounding electrode of device, to avoid security risk.
Correspondingly, the utility model first embodiment also provides a kind of electronic equipment including above-mentioned surge protective device,
Electronic equipment can be charging equipment, such as be applied to the charging equipment of mobile phone, tablet computer, notebook.Fig. 3 is that this is practical new
The part equivalent circuit diagram for the electronic equipment that type first embodiment provides, by taking electronic equipment is mobile phone charging network as an example.
With reference to Fig. 3, mobile phone charging network includes: that (transient state inhibits two to sequentially connected TVS from USB interface to charging chip
Pole pipe, Transient Voltage Suppressor) pipe D2, surge protective device 10 and capacitor C1, wherein TVS pipe D2
USB interface, other end ground connection are accessed in one end；The input terminal electrode 103 of surge protective device accesses USB interface；The one end capacitor C1
Access USB interface, other end ground connection.
The effect of TVS pipe D2 is the electrostatic prevented on charging network, is directed into ground for electrostatic.Capacitor C1 is connected in parallel on mobile phone and fills
In electric network, has the function of filtering clutter.
Surge protective device parallel connection accesses in mobile phone charging network, when PN junction is not breakdown in surge protective device, melts
The material of disconnected conductive part 105 is low-resistance material, and surge protective device can prevent the surge current on charging network, by surge electricity
Conductance passes to ground；When surge current is beyond the receiving upper limit of PN junction 10 in surge protective device, breakdown open circuit occurs for PN junction, into
And hot melt off line system is triggered, so that opening a way between the input terminal electrode 103 and ground of surge protective device, that is to say, that surge is anti-
Shield device is no longer connected in parallel in mobile phone charging network, so that be open-circuit condition between USB interface, surge protective device and ground, from
And prevent to be conducted to ground as charging current and caused by fuel factor, guarantee that charge function is unaffected can be used normally, and keeps away
Exempt from security risk caused by overheat.
Wherein, triggering hot melt off line system is referred to when surge current is greater than the PN junction receiving upper limit in surge protective device,
PN junction is breakdown and causes short circuit, and the voltage of USB interface is directly accessed ground at this point, being equivalent to, and will generate high current and makes wave
Protective device 10 is gushed to be rapidly heated, thus 100 internal temperature rapid increase of EOS tube body；When 100 internal temperature of EOS tube body
When rising to the fusing point of fusing conductive part 105, hot thawing occurs for fusing conductive part 105, so that USB interface is to ground by short circuit
State becomes open-circuit condition, thus prevent as high current and caused by temperature increase problem.
The utility model second embodiment also provides a kind of surge protective device, different from the first embodiment, this reality
It applies in example, fusing conductive part quantity is one, and the conductive part that fuses is connected serially between second electrode and grounding electrode.It below will knot
It closes attached drawing surge protective device provided in this embodiment is described in detail, it should be noted that identical as previous embodiment
Or corresponding part, it will not be described in detail below.
Fig. 4 is the schematic perspective view for the surge protective device that the utility model second embodiment provides.
With reference to Fig. 4, surge protective device includes: EOS tube body 200 and the PN junction in EOS tube body 200, position
In first electrode 201, second electrode 202, input terminal electrode and grounding electrode 204 in the EOS tube body 200, and institute
State input terminal of the first electrode 201 as PN junction, output end of the second electrode 202 as PN junction, input terminal electrode conduct
The input terminal of surge protective device；Fusing conductive part 205 in the EOS tube body 200, the fusing conductive part 205
It is connected serially between the second electrode 202 and the grounding electrode 204, and works as temperature in the EOS tube body 200 and reach described
When the fusing point of fusing conductive part 205, the fusing conductive part 205 occurs to melt so that the input terminal electrode and ground connection electricity
It is breaking between pole 204.
Surge protective device provided in this embodiment is described in detail below with reference to attached drawing.
In the present embodiment, fusing conductive part 205 is connected serially between the second electrode 202 and the grounding electrode 204, phase
It answers, the first electrode 201 is same electrode with the input terminal electrode.
The EOS tube body 200 exposes the input terminal electrode and grounding electrode 204.It is described defeated in the present embodiment
Enter the position of termination electrode, second electrode 202 and grounding electrode 204, can be arbitrarily arranged according to actual use demand.
The shape of the fusing conductive part 205 is Filamentous or column, the thickness in relation to the fusing conductive part 205, can
With the respective description with reference to previous embodiment, details are not described herein.
The fusing conductive part 205 has top and the bottom end opposite with the top, wherein top and bottom end are opposite
For 200 bottom of EOS tube body.In the present embodiment, 205 top of fusing conductive part is electrically connected with second electrode 202,
Correspondingly, 205 bottom end of fusing conductive part is electrically connected with grounding electrode 204.
In the present embodiment, surge protective device further include: the third electrode (not shown) being fixed in EOS tube body 200,
And third electrode is located at the top end surface of the fusing conductive part 205, the top of fusing conductive part 205 passes through the third electrode
It is electrically connected to the second electrode 202.
The third electrode can contact electrical connection with the second electrode 202；Alternatively, surge protective device can also wrap
Include: the electric connection structure in EOS tube body 200, electric connection structure one end are connected with third electrode, the other end and the second electricity
Pole 202 is connected, and is electrically connected the third electrode and second electrode 202 by the electric connection structure.The electric connection structure is
Conducting wire or conductive hole.
Surge protective device can also include: the 4th electrode (not shown) being fixed in EOS ontology 200, and the 4th is electric
Pole is located at the bottom end surface of the fusing conductive part 205, and the bottom end of fusing conductive part 205 is electrically connected to by the 4th electrode
The grounding electrode 204.
Fig. 5 is the corresponding equivalent circuit diagram of Fig. 4, and first electrode 201 and input terminal electrode access circuit input end I, the
It connects between one electrode 201 and second electrode 202 PN junction 20, fusing of connecting between second electrode 202 and grounding electrode 204 is conductive
Portion 105, grounding electrode 204 are grounded GND.
When surge current, which is less than PN junction 20, bears the upper limit, fusing conductive part 205 plays the role of low-resistance, and PN junction 20 is normal
Work guarantees that surge current can smoothly be conducted to ground GND by PN junction 20.When surge current is more than that PN junction 20 bears the upper limit
When, PN junction 20 is breakdown thus fail, first electrode 201 and the short circuit of second electrode 202, and 200 internal temperature of EOS tube body is quick
Rise；When 200 internal temperature of EOS tube body rises to fusing 205 fusing point of conductive part, fusing conductive part 205 will melt
Advection is to surrounding volume, thus the conductive part 205 that fuses is disconnected with the third electrode for being located at fusing 205 top of conductive part, that is,
It says, fusing conductive part 205 and second electrode 202 disconnect, so that open a way between second electrode 202 and grounding electrode 204, into
And make breaking between input terminal electrode 203 and grounding electrode 204.Thus, it is possible to prevent big by the circuit of input terminal electrode
Current lead-through is to ground GND, to prevent 200 internal temperature of EOS tube body from continuing to rise and the security risk of generation.
It should be noted that in other embodiments, may be arranged as: fusing conductive part top is electrically connected with grounding electrode
It connects, correspondingly, fusing conductive part bottom end is electrically connected with second electrode.Correspondingly, fusing conductive part melts so that fusing conductive part
It disconnects, then makes breaking between input terminal electrode and grounding electrode with grounding electrode.
Correspondingly, the utility model second embodiment also provides a kind of electronic equipment including above-mentioned surge protective device,
Electronic equipment can be charging equipment, such as be applied to the charging equipment of mobile phone, tablet computer, notebook.Fig. 6 is that this is practical new
The equivalent circuit diagram for the electronic equipment that type second embodiment provides, by taking electronic equipment is mobile phone charging network as an example.
With reference to Fig. 6, mobile phone charging network include: from USB interface to charging chip sequentially connected TVS pipe D2, surge it is anti-
Protect device and capacitor C1, wherein USB interface, other end ground connection, the input terminal of surge protective device are accessed in the one end TVS pipe D2
Electrode accesses USB interface, and USB interface, other end ground connection are accessed in the one end capacitor C1.
Surge protective device parallel connection accesses in mobile phone charging network, when PN junction is not breakdown in surge protective device, melts
The material of disconnected conductive part 205 (referring to Fig. 4) is low-resistance material, and surge protective device can prevent the electricity of the surge on charging network
Stream, is conducted to ground for surge current；When surge current is beyond the receiving upper limit of PN junction 20 in surge protective device, PN junction 20 is sent out
Raw breakdown open circuit, and then hot melt off line system is triggered, so that being opened between the input terminal electrode (referring to Fig. 4) and ground of surge protective device
Road, that is to say, that surge protective device is no longer connected in parallel in mobile phone charging network, so that USB interface, surge protective device and ground
Between be open-circuit condition, thus prevent as charging current be conducted to ground and caused by fuel factor, guarantee charge function not by shadow
Sound can be used normally, and avoid security risk caused by overheat.
Wherein, triggering hot melt off line system, which is referred to, bears the upper limit when surge current is greater than PN junction 20 in surge protective device
When, PN junction 20 is breakdown and causes short circuit, and the voltage of USB interface is directly accessed ground at this point, being equivalent to, and will generate high current makes
Surge protective device is obtained to be rapidly heated, thus EOS tube body 200 (referring to Fig. 4) internal temperature rapid increase；When EOS tube body
When 200 internal temperatures rise to the fusing point of fusing conductive part 205, hot thawing occurs for fusing conductive part 205, so that USB connects
Mouthful open-circuit condition become from short-circuit condition to ground, thus prevent as high current and caused by temperature increase problem.
The utility model 3rd embodiment also provides a kind of surge protective device, unlike previous embodiment, third
In embodiment fuse conductive part quantity be two, fusing conductive part include first fusing conductive part and second fusing conductive part.
Surge protective device provided in this embodiment is described in detail below with reference to attached drawing, it should be noted that with aforementioned reality
It applies that example is identical or corresponding part, will not be described in detail below.
Fig. 7 is the structural schematic diagram for the surge protective device that the utility model 3rd embodiment provides.
With reference to Fig. 7, surge protective device includes: EOS tube body 300 and the PN junction in EOS tube body 300, position
In first electrode 301, second electrode 302, input terminal electrode 303 and grounding electrode 304 in the EOS tube body 300, and
Input terminal of the first electrode 301 as PN junction, output end of the second electrode 302 as PN junction, the input terminal electricity
Input terminal of the pole 303 as surge protective device；Fusing conductive part in the EOS tube body 300, the fusing are conductive
Portion includes the first fusing conductive part 315 and the second fusing conductive part 325, wherein the first fusing conductive part 315 is connected serially to first
Between electrode 301 and input terminal electrode 303, the second fusing conductive part 325 be connected serially to second electrode 302 and grounding electrode 304 it
Between, and when 300 temperature of EOS tube body reaches the fusing point of the first fusing conductive part 315, first fusing is conductive
Portion 315 occurs to melt so that breaking between the input terminal electrode 303 and grounding electrode 304, when 300 temperature of EOS tube body
When degree reaches the fusing point of the second fusing conductive part 325, the second fusing conductive part 315 occurs to melt so that the input terminal end
It is breaking between machine 303 and grounding electrode 304.
Surge protective device provided in this embodiment is described in detail below with reference to attached drawing.
Corresponding description in relation to the first fusing conductive part 315 and the second fusing conductive part 325, can refer to aforementioned reality
The respective description of example is applied, details are not described herein.
In the present embodiment, for the scheme compared to only one fusing conductive part, due in input terminal electrode 303 and the
The first fusing of series connection conductive part 315 between one electrode 301, the second fusing of connecting between second electrode 302 and grounding electrode 304 are led
Electric portion 325, when 300 internal temperature of EOS tube body reaches fusing conductive part fusing point, the first fusing conductive part 315 and second melts
At least one in disconnected conductive part 325 can melt, so that between input terminal electrode 303 and grounding electrode 304 in time
In open-circuit condition, more effectively prevent 300 internal temperature of EOS tube body excessively high.
The shape of the first fusing conductive part 315 is Filamentous or column；The shape of the second fusing conductive part 325
For Filamentous or column.In the present embodiment, the melt temperature of the first fusing conductive part 315 and the second fusing conductive part
325 melt temperature is identical；The thickness phase of the thickness of the first fusing conductive part 315 and the second fusing conductive part 325
Together.
It should be noted that in other embodiments, the melt temperature of the first fusing conductive part can also be with the second fusing
The melt temperature of conductive part is different；The thickness of first fusing conductive part can also be different from the second fusing thickness of conductive part.
Fig. 8 is the corresponding equivalent circuit diagram of Fig. 7, and input terminal electrode 303 accesses circuit input end I, and input terminal electrode 303
Connect between first electrode 301 first fusing conductive part 315, PN junction of connecting between first electrode 301 and second electrode 302,
Connect between second electrode 302 and grounding electrode 304 second fusing conductive part 325, grounding electrode 304 be grounded GND.
When surge current be less than PN junction bear the upper limit when, first fusing conductive part 315 and the second fuse part 325 rise it is low
Resistance effect, PN junction work normally, and guarantee that surge current can smoothly be conducted to ground GND by PN junction.When surge current is more than PN
When knot bears the upper limit, PN junction is breakdown thus fail, first electrode 301 and the open circuit of second electrode 302, inside EOS tube body 300
Temperature rapid increase；When 300 internal temperature of EOS tube body rises to the first fusing conductive part 315 or the second fusing conductive part
When 325 fusing point, the first fusing conductive part 315 or the second fusing generation of conductive part 325 thawing advection are such as aforementioned to surrounding volume
Analysis is it is found that form open circuit between input terminal electrode 303 and grounding electrode 304.Thus, it is possible to avoid by input terminal electrode
303 circuit high current is conducted to ground GND, so that it is hidden to prevent 300 internal temperature of EOS tube body from continuing the safety for rising and generating
Suffer from.
And the first fusing conductive part 315 and the second fusing conductive part 325 constitute dual fail-safe, guarantee input terminal electrode
Open circuit is formed between 303 and grounding electrode 304 in time.
Correspondingly, the present embodiment also provides a kind of electronic equipment including above-mentioned surge protective device.The present embodiment provides
Electronic equipment, not only have EOS defencive function, and can also prevent as surge current is excessive and caused by security risk.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific implementation of the utility model
Example, and in practical applications, can to it, various changes can be made in the form and details, without departing from the spirit of the utility model
And range.Anyone skilled in the art can be made respectively to change and repair without departing from the spirit and scope of the utility model
Change, thus the protection scope of the utility model should be subject to claim restriction range.
Claims (10)
1. a kind of surge protective device characterized by comprising
EOS tube body and the PN junction in the EOS tube body, first electrode in the EOS tube body, second
Electrode, input terminal electrode and grounding electrode, and input terminal of the first electrode as the PN junction, the second electrode are made
For the output end of the PN junction, input terminal of the input terminal electrode as surge protective device；
Fusing conductive part in the EOS tube body, the fusing conductive part and PN junction setting are extremely described defeated
Enter between termination electrode and the grounding electrode, and when temperature reaches the fusing point of the fusing conductive part in the EOS tube body,
The fusing conductive part occurs to melt so that breaking between the input terminal electrode and the grounding electrode.
2. surge protective device as described in claim 1, which is characterized in that the quantity of the fusing conductive part is one, and
The fusing conductive part is connected serially between the first electrode and the input terminal electrode；The second electrode and ground connection electricity
Extremely same electrode.
3. surge protective device as described in claim 1, which is characterized in that the quantity of the fusing conductive part is one, and
The fusing conductive part is connected serially between the second electrode and the grounding electrode；The first electrode and input terminal electricity
Extremely same electrode.
4. surge protective device as described in claim 1, which is characterized in that the fusing conductive part includes that the first fusing is conductive
Portion and the second fusing conductive part, the first fusing conductive part be connected serially to the first electrode and the input terminal electrode it
Between, the second fusing conductive part is connected serially between the second electrode and the grounding electrode.
5. the surge protective device as described in claim 2,3 or 4, which is characterized in that the shape of the fusing conductive part is silk
Shape or column.
6. the surge protective device as described in claim 2,3 or 4, which is characterized in that the fusing conductive part have top and
The bottom end opposite with the top；Further include: the third electrode being fixed in the EOS tube body, the third electrode are located at
The top end surface of the fusing conductive part.
7. surge protective device as claimed in claim 6, which is characterized in that the fusing conductive part top near zone setting
There is accommodation space.
8. surge protective device as claimed in claim 6, which is characterized in that further include: the electricity in the EOS tube body
Connection structure, described electric connection structure one end connect the third electrode.
9. surge protective device as claimed in claim 8, which is characterized in that the electric connection structure includes conducting wire or conduction
Hole.
10. a kind of electronic equipment, which is characterized in that including surge protective device as described in any one of claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920328066.1U CN209419208U (en) | 2019-03-14 | 2019-03-14 | Surge protective device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920328066.1U CN209419208U (en) | 2019-03-14 | 2019-03-14 | Surge protective device and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209419208U true CN209419208U (en) | 2019-09-20 |
Family
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|---|---|---|---|
| CN201920328066.1U Active CN209419208U (en) | 2019-03-14 | 2019-03-14 | Surge protective device and electronic equipment |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007326A (en) * | 2021-09-13 | 2022-02-01 | 荣耀终端有限公司 | Power supply circuit, circuit board, electronic equipment and manufacturing method of circuit board |
| CN114121900A (en) * | 2022-01-27 | 2022-03-01 | 深圳中科四合科技有限公司 | ESD device processing method with overvoltage and over-current protection functions |
| CN114121901A (en) * | 2022-01-27 | 2022-03-01 | 深圳中科四合科技有限公司 | ESD device with fuse function |
-
2019
- 2019-03-14 CN CN201920328066.1U patent/CN209419208U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114007326A (en) * | 2021-09-13 | 2022-02-01 | 荣耀终端有限公司 | Power supply circuit, circuit board, electronic equipment and manufacturing method of circuit board |
| CN114121900A (en) * | 2022-01-27 | 2022-03-01 | 深圳中科四合科技有限公司 | ESD device processing method with overvoltage and over-current protection functions |
| CN114121901A (en) * | 2022-01-27 | 2022-03-01 | 深圳中科四合科技有限公司 | ESD device with fuse function |
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