CN110336262A - A kind of surge protection circuit - Google Patents
A kind of surge protection circuit Download PDFInfo
- Publication number
- CN110336262A CN110336262A CN201910620110.0A CN201910620110A CN110336262A CN 110336262 A CN110336262 A CN 110336262A CN 201910620110 A CN201910620110 A CN 201910620110A CN 110336262 A CN110336262 A CN 110336262A
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- Prior art keywords
- surge
- diode
- module structure
- protection circuit
- serial module
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
Abstract
The application provides a kind of surge protection circuit, including serial module structure and surge unit；Serial module structure and surge unit meet respectively release accordingly require when, the surge voltage received is released to ground, the input voltage of electronic equipment is made to be clamped at the safe operating voltage of itself, guarantees electronic equipments safety work；In addition; compared with prior art; the application is on the basis of the parasitic capacitance of surge unit; for the parasitic capacitance of its serial module structure of having connected; and the parasitic capacitance of serial module structure is less than the parasitic capacitance of surge unit; so that total parasitic capacitance of surge protection circuit reduces, the distortion effects of high speed signal are reduced, so that surge protection circuit provided by the present application can be applied to high-speed port.
Description
Technical field
The present invention relates to power electronics fields, more particularly to a kind of surge protection circuit.
Background technique
Surge voltage is above the transient overvoltage of operating voltage, has the characteristics that voltage is big and generation time is extremely short.When
There is power network fluctuation, when static discharge, is easy to generate surge voltage in the port of electronic equipment, such as electronic equipment
Charging port；If surge voltage is more than the ability to bear of the port of electronic equipment, can cause a devastating effect to electronic equipment.
In order to protect the charging port of electronic equipment, it will usually electronic equipment charging port to one in parallel between ground
TVS diode (Transient Voltage Suppressor, Transient Suppression Diode), or can be in the charging of electronic equipment
Port is using an IC with surge protection function.When there is surge voltage Vsurge, such as Fig. 1 passes through TVS electrical surge
Inhibit diode or the IC (integrated circuit, integrated circuit) with surge protection function, surge voltage is released
To ground, and the input voltage of charging port is clamped down on to the trouble free service for guaranteeing corresponding electronic equipment in clamp voltage Vclamp.
But surge protection circuit in the prior art can be only applied to low-speed port, the i.e. more stable port of voltage,
Such as charging port；When being applied to high-speed port, for example when data port, high speed signal can be made to be distorted, influence electronics and set
Standby data transmission.
Summary of the invention
In view of this, being protected the embodiment of the invention provides a kind of surge protection circuit with solving surge in the prior art
Protection circuit can not be applied to the problem of high-speed port.
To achieve the above object, the embodiment of the present invention provides the following technical solutions:
The application provides a kind of surge protection circuit, is applied to electronic equipment, comprising: serial module structure and surge list
Member；Wherein:
The output end of the serial module structure is connected with the input terminal of the surge unit；Also, the serial module structure
Input terminal receive surge voltage, the surge unit output end ground connection；
When the serial module structure and the surge unit meet respectively accordingly release require when, the serial module structure
The surge voltage is released to ground with the surge unit；
The parasitic capacitance of the serial module structure is less than the parasitic capacitance of the surge unit.
Optionally, the serial module structure, comprising: first switch tube and first diode；Wherein:
The first switch tube is connected in parallel with the first diode opposite direction.
Optionally, the first switch tube is the low-voltage tube of isolation.
Optionally, the first diode is the parasitic diode of the first switch tube.
Optionally, the first switch tube is N-type metal-oxide semiconductor fieldeffect transistor NMOS transistor；
The cathode of the first diode is connected with the grid of the NMOS transistor and drain electrode, described in tie point conduct
The input terminal of serial module structure；
The anode of the first diode is connected with the source electrode of the NMOS transistor, and tie point is as the defeated of serial module structure
Outlet.
Optionally, the first switch tube is p-type metal-oxide semiconductor fieldeffect transistor NMOS transistor；
The cathode of the first diode is connected with the source electrode of the PMOS transistor, and tie point is as the serial module structure
Input terminal；
The anode of the first diode is connected with the grid of the PMOS transistor and drain electrode, described in tie point conduct
The output end of serial module structure.
Optionally, the surge unit, comprising: second switch, the second diode, zener diode and ground connection
Resistance；Wherein:
The input terminal of the second switch and the cathode of second diode and the cathode of the zener diode
It is connected, input terminal of the tie point as the surge unit；
The anode of the zener diode and one end of ground resistance are connected, the control of tie point and the second switch
End processed is connected；
The output end of the second switch is connected with the other end of the ground resistance, and tie point is as the surge list
The output end of member.
Optionally, the serial module structure and the surge unit are integrated in integrated circuit.
Optionally, the second switch is High voltage NMOS transistor.
Optionally, the surge unit includes: Transient Suppression Diode TVS.
The application provides a kind of surge protection circuit, including serial module structure and surge unit；In serial module structure and wave
It gushes vent unit and meets respectively and release when requiring accordingly, the surge voltage received is released to ground, makes the defeated of electronic equipment
Enter the safe operating voltage that voltage is clamped at itself, guarantees electronic equipments safety work；In addition, compared with prior art, this
Application is on the basis of the parasitic capacitance of surge unit, for the parasitic capacitance of its serial module structure of having connected, and connects
The parasitic capacitance of module is less than the parasitic capacitance of surge unit, so that total parasitic capacitance of surge protection circuit reduces, it is right
The distortion effects of high speed signal reduce, so that surge protection circuit provided by the present application can be applied to high-speed port.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is that surge voltage and input port add the V diagram after device of surge protector in the prior art；
Fig. 2 is the schematic diagram of surge protection circuit in the prior art；
Fig. 3 is to carry out the emulation experiment datagram that emulation experiment obtains to surge protection circuit in the prior art；
Fig. 4 is a kind of schematic diagram of surge protection circuit provided by the embodiments of the present application；
Fig. 5 is a kind of schematic diagram of the embodiment for serial module structure that another embodiment of the application provides；
Fig. 6 is a kind of schematic diagram of the embodiment for serial module structure that another embodiment of the application provides；
Fig. 7 is a kind of schematic diagram of the embodiment for surge unit that another embodiment of the application provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In this application, the terms "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion,
So that the process, method, article or equipment for including a series of elements not only includes those elements, but also including not having
The other element being expressly recited, or further include for elements inherent to such a process, method, article, or device.Do not having
There is the element limited in the case where more limiting by sentence "including a ...", it is not excluded that in the mistake including the element
There is also other identical elements in journey, method, article or equipment.
In the prior art, the specific structure of surge protection circuit such as Fig. 2, comprising: series arm 10, divider resistance R and
Switching tube M.
The input terminal of series arm 10 is connected with the input port of electronic equipment, receives surge voltage Vsurge；Series connection branch
The output end on road 10 is connected with one end of divider resistance R, and tie point is denoted as A point.Wherein, series arm 10 is by N number of two pole of pressure stabilizing
Pipe composition remembers that N number of zener diode is Z1-Zn respectively, and N is the integer not less than 1；Also, N number of zener diode is successively gone here and there
Connection, input terminal of the cathode as series arm after series connection, output end of the anode as series arm after series connection；In addition, N number of
The breakdown reverse voltage of zener diode is identical, is VBR.When reverse breakdown electricity of the surge voltage Vsurge less than or equal to N times
When pressure N*VBR, i.e. Vsurge≤N*VBR, series arm 10 is not breakdown；When surge voltage Vsurge reversely hitting greater than N times
Wear voltage VBR, i.e. when Vsurge > N*VBR, series arm 10 is breakdown.
The other end of divider resistance R is grounded GND.When series arm 10 is not breakdown, no electric current stream on divider resistance R
It crosses, and then the both ends of divider resistance R do not have voltage generation；When series arm 10 is breakdown, there is electric current stream on divider resistance R
It crosses, and then there is voltage generation at the both ends divider resistance R, and the voltage Vr at the both ends divider resistance R is with the increasing for flowing through itself electric current
Increase greatly, i.e. the voltage Vr at the both ends divider resistance R increases with the increase of surge voltage Vsurge.
The input terminal of switching tube M is connected with the input terminal of series arm 10；The control terminal of switching tube M is connected with A point；Switch
The output end of pipe M is connected with the other end of divider resistance R.When the voltage Vr at the both ends divider resistance R is less than or equal to the threshold of switching tube M
When threshold voltage Vth_M, i.e. Vr≤Vth_M, switching tube M shutdown does not release to surge voltage Vsurge；As divider resistance R
When the voltage Vr at the both ends threshold voltage vt h_M greater than switching tube M, i.e. Vr > Vth_M, switching tube M conducting, by surge voltage
Vsurge is released to ground GND, and the input voltage VIN of the input port of electronic equipment is clamped down in safe operating voltage range.
In order to better illustrate, emulation is carried out in fact with the electronic equipment of surge protection circuit to one in practical application
It tests, the result of emulation experiment such as Fig. 3, when surge voltage Vsurge is more than 37V, the control terminal voltage NGATE of switching tube M is greater than
The threshold voltage vt h_M of switching tube M, switching tube M conducting, surge protection circuit start to work, surge voltage Vsurge are released
To ground GND, the input voltage VIN of electronic equipment is clamped down in 37V or so, guarantees that electronic equipment will not be destroyed by surge voltage；
And surge current IIN changes with the variation of surge voltage.
But the surge protection circuit is applied to high-speed port, that is, is applied to that high speed signal can be transmitted when working normally
Port when, since the parasitic capacitance of surge protection circuit GND over the ground is larger, can make to send out by the high speed signal of high-speed port
Raw distortion, influences the normal transmission of high speed signal；Therefore, surge protection circuit in the prior art can not be applied to speed end
Mouthful.
In order to solve the problems, such as that surge protection circuit in the prior art can not be applied to high-speed port, the application provides one
Kind surge protection circuit, specific structure such as Fig. 4, comprising: serial module structure 100 and surge unit 200.
The output end of serial module structure 100 is connected with the input terminal of surge unit 200；Also, the input of serial module structure
End receives surge voltage Vsurge, and the output end of surge unit 200 is grounded GND.
Wherein, when serial module structure 100 and surge unit 200 meet respectively accordingly release require when, serial module structure
100 and surge unit 200 by surge voltage Vsurge be released to ground GND.
If surge voltage Vsurge is positive voltage, the requirement of releasing of serial module structure 100 are as follows: surge voltage Vsurge is greater than
First threshold voltage Vth1, i.e. Vsurge > Vth1；When the satisfaction of serial module structure 100, which is released, to be required, surge voltage Vsurge is let out
It is put into the input terminal of surge unit 200；When serial module structure 100 be unable to satisfy release require when, not to surge voltage
Vsurge releases.
If surge voltage Vsurge is positive voltage, the requirement of releasing of surge unit 200 are as follows: surge voltage Vsurge
Greater than second threshold voltage Vth2, i.e. Vsurge > Vth2；When the satisfaction of surge unit 200, which is released, to be required, by surge voltage
Vsurge is released to ground GND；When surge unit 200 be unable to satisfy release require when, not to surge voltage Vsurge carry out
It releases.
If surge voltage Vsurge is negative voltage, serial module structure 100 and surge unit 200 are all satisfied to release and want
It asks, surge voltage Vsurge is released to ground.
It should be noted that first threshold voltage Vth1 and second threshold voltage Vth2 are positive voltage；Also, the first threshold
Threshold voltage Vth1 and second threshold voltage Vth2 is the safe operating voltage according to the input port in practical application and combines real
What border situation was chosen；In addition, first threshold voltage Vth1 can be less than second threshold voltage Vth2, the can also be equal to or more than
Two threshold voltage vt h2, herein without limitation, within the scope of protection of this application；But first threshold voltage Vth1 and
The size relation of two threshold voltage vt h2 is preferred are as follows: first threshold voltage Vth1 be less than second threshold voltage Vth2, i.e. Vth1 <
Vth2。
Optionally, serial module structure 110 and surge unit 200 can integrate in integrated circuit, can also be by discrete
Device composition；When being made of discrete device, surge unit 200 can also be by TVS (Transient Voltage
Suppressor, Transient Suppression Diode) it is individually composed.
In addition, the parasitic capacitance of serial module structure 100 is less than the parasitic capacitance of surge unit 200.
It should be noted that serial module structure 100 is connected with surge unit 200, and the parasitic capacitance of serial module structure 100
Less than the parasitic capacitance of surge unit 200, it is equivalent to and connects one on the basis of the parasitic capacitance of surge unit 200
A smaller parasitic capacitance, the i.e. parasitic capacitance of serial module structure 100, so can be released according to the calculation formula of series capacitance:
Total parasitic capacitance after series connection is less than the parasitic capacitance of serial module structure 100.
The surge protection circuit provided in this embodiment meets phase in serial module structure 100 and surge unit 200 respectively
When releasing of answering requires, the surge voltage Vsurge received is released to ground, is clamped at the input voltage of electronic equipment
The safe operating voltage of itself guarantees electronic equipments safety work；In addition, compared with prior art, the application is in surge
On the basis of the parasitic capacitance of unit 200, the parasitic capacitance for serial module structure 100 of connecting, and the parasitic capacitance of serial module structure 100 is small
In the parasitic capacitance of surge unit 200, so that total parasitic capacitance of surge protection circuit reduces, the distortion to high speed signal
It influences to reduce, so that surge protection circuit provided by the present application can be applied to high-speed port, such as USB D+/D-,
TypeCSBU。
In another embodiment of the application, a kind of embodiment of serial module structure 100, specific structure such as Fig. 5 or figure are provided
6, comprising: first switch tube M1 and first diode D1.
Such as Fig. 5, if first switch tube M1 is NMOS transistor (N-Metal-Oxide-Semiconductor, N-type metal-
Oxide-Semiconductor Field effect transistor), then the cathode of first diode D1 and the grid of NMOS transistor and drain electrode are homogeneous
Even, input terminal of the tie point as serial module structure 100；Also, the source electrode phase of the anode of the first diode D1 and NMOS transistor
Even, output end of the tie point as serial module structure 100.
When surge voltage Vsurge is positive voltage, first diode D1 reversely ends, when surge voltage Vsurge is positive
Voltage and the threshold voltage vt h_N for being greater than NMOS transistor, i.e. when Vsurge > Vth_N, NMOS transistor conducting, by surge electricity
Pressure Vsurge is exported to the input terminal of surge unit 200；When surge voltage Vsurge be positive voltage, and be less than or equal to NMOS
When the threshold voltage vt h_N of transistor, i.e. Vsurge≤Vth_N, NMOS transistor shutdown, can not to surge voltage Vsurge into
Row is released.
It should be noted that first threshold voltage Vth1 is equal to the threshold voltage vt h_N, i.e. Vth1=of NMOS transistor
Vth_N, therefore first threshold voltage Vth1 can be adjusted by the threshold voltage vt h_N of adjusting NMOS transistor.
Such as Fig. 6, if first switch tube M1 is PMOS transistor (P-Metal-Oxide-Semiconductor, p-type metal-
Oxide-Semiconductor Field effect transistor), then the cathode of first diode D1 is connected with the source electrode of PMOS transistor, tie point
Input terminal as serial module structure 100；Also, the anode of the first diode D1 is connected with the grid of PMOS transistor and drain electrode,
Output end of the tie point as serial module structure 100.
When surge voltage Vsurge is positive voltage, first diode D1 reversely ends, when surge voltage Vsurge is positive
The absolute value of voltage and the threshold voltage greater than PMOS transistor, i.e. Vsurge > | Vth_P | when, PMOS transistor conducting will be unrestrained
Voltage Vsurge is gushed to export to surge unit 200；When surge voltage Vsurge be positive voltage, and be less than or equal to PMOS crystal
The absolute value of the threshold voltage of pipe, i.e. Vsurge≤| Vth_P | when, PMOS transistor shutdown can not be to surge voltage Vsurge
It releases.
It should be noted that first threshold voltage Vth1 is equal to the absolute value of the threshold voltage of PMOS transistor | Vth_P |,
That is Vth1=| Vth_P |, therefore the threshold voltage of adjusting PMOS transistor can be passed through | and Vth_P |, to first threshold voltage
Vth1 is adjusted.
Optionally, NMOS transistor and PMOS transistor are the low-voltage tubes of isolation；First diode D1 is first switch tube
The parasitic diode of M1.
Remaining structure and working principle are same as the previously described embodiments, no longer repeat one by one herein.
In an alternative embodiment of the invention, a kind of embodiment of surge unit 200 is provided, specific structure such as Fig. 7,
It include: second switch M2, the second diode D2, zener diode Z and ground resistance R.
The input terminal of second switch M2 is connected with the cathode of the cathode of the second diode D2 and zener diode Z,
Input terminal of the tie point as surge unit 200；The anode of zener diode Z and one end of ground resistance R are connected,
The control terminal that tie point opens hanging tube M2 with second is connected；The output end of second switch M2 is connected with the other end of ground resistance R,
Output end of the tie point as surge unit.
If surge voltage Vsurge is positive voltage, before zener diode Z is by surge voltage Vsurge reverse breakdown, the
Two switching tube M2 are not turned on, and can not be released to surge voltage Vsurge；It is anti-by surge voltage Vsurge in zener diode Z
To after breakdown, there is electric current to flow through on ground resistance R, and generates voltage VR on ground resistance R；When voltage VR is greater than second switch
When the threshold voltage vt h_M2 of pipe M2, i.e. VR > Vth_M2, Continuity signal is exported to the control terminal of second switch M2, makes second
Surge voltage is released to ground GND by switching tube M2 conducting；When voltage VR is less than or equal to the threshold voltage vt h_ of second switch M2
When M2, i.e. VR≤Vth_M2, cut-off signals are exported to the control terminal of second switch M2, make second switch M2 can not be to surge
Voltage Vsurge releases.
If surge voltage Vsurge is negative voltage, first diode D1 and the second diode D2 conducting, by surge voltage
Vsurge is released to ground GND.
It should be noted that conduction voltage drop of the second threshold voltage Vth2 equal to first switch tube M1, zener diode Z
The sum of the threshold voltage vt h_M2, i.e. Vth2=Vds_M1+VBR+Vth_ of breakdown reverse voltage VBR and second switch M2
M2 therefore, can be by adjusting reversely hitting for zener diode Z in the case where the conduction voltage drop of first switch tube M1 is certain
The threshold voltage vt h_M2 for wearing voltage VBR and/or second switch M2, is adjusted second threshold voltage Vth2.
Optionally, zener diode Z could alternatively be the pressure stabilizing branch being sequentially connected in series by N number of zener diode, N be greater than
Equal to 1 integer；Also other elements or circuit for realizing identical function therewith be could alternatively be, be not specifically limited herein.
Optionally, since input port generally requires certain voltage endurance capability, so second switch M2 needs are
High voltage NMOS transistor is also possible to realize the other elements of identical function with the High voltage NMOS transistor being isolated, not do herein
Limitation.
It should be noted that the parasitic capacitance over the ground of former surge unit 200 is Cbig, first switch tube M1 is to series connection
The parasitic capacitance of 100 output end of module is Csmall, then both the total capacitance after series connection is less than Csmall's namely concatenated
The result is that reducing capacitor.Since the first switch tube M1 in above-described embodiment is diode connection type, and first switch tube
M1 can be the low tension switch pipe of isolation, so the overcurrent capability of first switch tube M1 is stronger, and then first switch tube M1
Size is less than second switch M2, so that the parasitic capacitance of first switch tube M1 is much smaller than the parasitic capacitance of second switch M2,
That is parasitic capacitance of the parasitic capacitance of serial module structure 100 much smaller than surge unit 200.
It should be noted that the present embodiment only merely provides a kind of specific embodiment of surge unit,
He realizes the embodiment of identical function in the protection scope of the present embodiment therewith.
Remaining structure and working principle are same as the previously described embodiments, no longer repeat one by one herein.
All the embodiments in this specification are described in a progressive manner, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.System and system embodiment described above is only schematical, wherein the conduct
The unit of separate part description may or may not be physically separated, component shown as a unit can be or
Person may not be physical unit, it can and it is in one place, or may be distributed over multiple network units.It can root
According to actual need that some or all of the modules therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel can understand and implement without creative efforts.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of surge protection circuit, which is characterized in that be applied to electronic equipment, comprising: serial module structure and surge list
Member；Wherein:
The output end of the serial module structure is connected with the input terminal of the surge unit；Also, the serial module structure is defeated
Enter end and receives surge voltage, the output end ground connection of the surge unit；
When the serial module structure and the surge unit meet respectively release accordingly require when, the serial module structure and institute
It states surge unit and the surge voltage is released to ground；
The parasitic capacitance of the serial module structure is less than the parasitic capacitance of the surge unit.
2. surge protection circuit according to claim 1, which is characterized in that the serial module structure, comprising: first switch tube
And first diode；Wherein:
The first switch tube is connected in parallel with the first diode opposite direction.
3. surge protection circuit according to claim 2, which is characterized in that the first switch tube is the low pressure of isolation
Pipe.
4. surge protection circuit according to claim 2, which is characterized in that the first diode is the first switch
The parasitic diode of pipe.
5. surge protection circuit according to claim 2, which is characterized in that the first switch tube is N-type metal-oxide
Object-semiconductor field effect transistor NMOS transistor；
The cathode of the first diode is connected with the grid of the NMOS transistor and drain electrode, and tie point is as the series connection
The input terminal of module；
The anode of the first diode is connected with the source electrode of the NMOS transistor, output of the tie point as serial module structure
End.
6. surge protection circuit according to claim 2, which is characterized in that the first switch tube is p-type metal-oxide
Object-semiconductor field effect transistor PMOS transistor；
The cathode of the first diode is connected with the source electrode of the PMOS transistor, and tie point is defeated as the serial module structure
Enter end；
The anode of the first diode is connected with the grid of the PMOS transistor and drain electrode, and tie point is as the series connection
The output end of module.
7. surge protection circuit according to claim 1-6, which is characterized in that the surge unit, packet
It includes: second switch, the second diode, zener diode and ground resistance；Wherein:
The input terminal of the second switch and the cathode of second diode and the cathode of the zener diode are homogeneous
Even, input terminal of the tie point as the surge unit；
The anode of the zener diode and one end of ground resistance are connected, the control terminal of tie point and the second switch
It is connected；
The output end of the second switch is connected with the other end of the ground resistance, and tie point is as the surge unit
Output end.
8. surge protection circuit according to claim 7, which is characterized in that the serial module structure and the surge list
Member is integrated in integrated circuit.
9. surge protection circuit according to claim 7, which is characterized in that the second switch is high pressure NMOS crystal
Pipe.
10. surge protection circuit according to claim 1-6, which is characterized in that the surge unit packet
It includes: Transient Suppression Diode TVS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910620110.0A CN110336262B (en) | 2019-07-10 | 2019-07-10 | Surge protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910620110.0A CN110336262B (en) | 2019-07-10 | 2019-07-10 | Surge protection circuit |
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| CN110336262B CN110336262B (en) | 2021-11-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234594A (en) * | 2020-10-09 | 2021-01-15 | 清华大学深圳国际研究生院 | Surge protection system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112234594A (en) * | 2020-10-09 | 2021-01-15 | 清华大学深圳国际研究生院 | Surge protection system and method |
| CN112234594B (en) * | 2020-10-09 | 2023-11-10 | 清华大学深圳国际研究生院 | Surge protection system and method |
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| CN110336262B (en) | 2021-11-12 |
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