CN110401181A - A kind of surging protection circuit - Google Patents
A kind of surging protection circuit Download PDFInfo
- Publication number
- CN110401181A CN110401181A CN201910596669.4A CN201910596669A CN110401181A CN 110401181 A CN110401181 A CN 110401181A CN 201910596669 A CN201910596669 A CN 201910596669A CN 110401181 A CN110401181 A CN 110401181A
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- Prior art keywords
- protection circuit
- branch
- capacitance
- surging
- signal
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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
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
-
- 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
-
- 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
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
Abstract
The present invention relates to a kind of surging protection circuits, surging protection circuit includes: coaxial interface, video module, power module, signal branch, power branch and common branch, coaxial interface is connect by common branch and signal branch with video module, coaxial interface is connected by common branch and power branch coaxial interface, and signal branch includes capacitance and the first protection circuit；Video module passes sequentially through the first protection circuit and capacitance is connected to common branch, and the first protection circuit is used for the surge current released in signal branch.By the way that the first protection circuit is arranged between capacitance and video module, the surge current that can effectively release in signal branch, while the surge voltage of common branch is also reduced, prevent circuit devcie from damaging.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to a kind of surging protection circuit.
Background technique
In coaxial camera field, in order to save the DC power supply interface of camera, power usually using POC interface, i.e., it is coaxial to supply
Electricity is equivalent to be powered simultaneously using a coaxial cable and be transmitted with signal.Surge (Electrical surge) is also named
Surging refers to the transient overvoltage for exceeding normal working voltage on electrical equipment.Essentially, surge is occurred only several hundred
A kind of violent pulse in time a ten thousandth second.The reason of generating surge includes internal cause, such as electrical equipment start and stop and
Failure etc. and external cause such as thunder and lightning etc..Supply power coaxially belongs to newer technology in the practical of high definition camera, therefore at present not
There is the carrying out surge protection scheme for coaxial high definition camera.
Summary of the invention
The embodiment of the present application provides a kind of surging protection circuit, can satisfy the carrying out surge protection of supply power coaxially circuit and needs
It asks.
A kind of surging protection circuit, the surging protection circuit include: coaxial interface, video module, power module, signal
Branch, power branch and common branch, the coaxial interface pass through the common branch and signal branch and the video
Module connection, the coaxial interface pass through the connection of power module described in the common branch and power branch, the signal branch
Road includes capacitance and the first protection circuit；
The video module passes sequentially through first protection circuit and capacitance is connected to common branch, and described
One protection circuit is used for the surge current released in the signal branch.
In one embodiment, first protection circuit includes the first protective device, one end of first protective device
It is connect with the tie point of the video module and capacitance, the other end ground connection of first protective device；Described first is anti-
Shield device is any one of gas-discharge tube, unidirectional transient state inhibition diode or voltage switch type Transient Suppression Diode.
In one embodiment, the capacitance of the capacitance is greater than 100 μ F.
In one embodiment, the second protection circuit and build-out resistor, the video are additionally provided in the signal branch
Module passes sequentially through the second protection circuit, the build-out resistor, the first protection circuit and capacitance and is connected to common branch；
One end of second protection circuit is connect with the tie point of the video module and build-out resistor, second protection circuit
Other end ground connection.
In one embodiment, second protection circuit includes that transient state inhibits diode.
In one embodiment, the transient state inhibits the capacitance of diode to be less than 1pf.
In one embodiment, the power branch is equipped with inductance and third protection circuit；
The power module passes sequentially through the third protection circuit and inductance connection to common branch, and the third is anti-
One end of protection circuit is connect with the tie point of the inductance and common branch, the other end ground connection of the third protection circuit.
In one embodiment, the third protection circuit includes concatenated third protective device and rectifier bridge.
In one embodiment, the surging protection circuit further includes the 4th protection circuit,
One end of 4th protection circuit is connect with the common branch, another termination of the 4th protection circuit
Ground, the surge current for releasing on the common branch.
In one embodiment, the 4th protection circuit includes concatenated 4th protective device and gas-discharge tube.
Surging protection circuit provided in this embodiment includes: coaxial interface, video module, power module, signal branch, electricity
Source branch and common branch, the coaxial interface are connected by the common branch and signal branch and the video module
It connects, the coaxial interface includes by the connection of power module described in the common branch and power branch, the signal branch
Capacitance and the first protection circuit；The video module passes sequentially through first protection circuit and capacitance connection
To common branch, first protection circuit is used for the surge current released in the signal branch.By capacitance with
First protection circuit is set between video module, the surge current of inferior grade in the signal branch that can effectively release, while also dropping
The low surge voltage of common branch, prevents circuit devcie from damaging.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, 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
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of the POC system provided in one embodiment；
Fig. 2 is a kind of schematic diagram of the surging protection circuit provided in one embodiment；
Fig. 3 is a kind of circuit diagram of the surging protection circuit provided in one embodiment；
Fig. 4 is a kind of circuit diagram of the surging protection circuit provided in another embodiment.
Specific embodiment
The application in order to facilitate understanding, in order to make the above objects, features, and advantages of the present application more apparent, under
Face is described in detail in conjunction with specific embodiment of the attached drawing to the application.It is explained in the following description many details
In order to fully understand the application, the better embodiment of the application is given in attached drawing.But the application can be with many not
With form realize, however it is not limited to embodiments described herein.On the contrary, the purpose of providing these embodiments is that making
Disclosure of this application is understood more thorough and comprehensive.The application can be to be much different from other way described herein
Implement, those skilled in the art can do similar improvement without prejudice to the application intension, therefore the application not by
The limitation of following public specific embodiment.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present application, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.In the description of the present application, " several " are meant that at least one, such as one,
Two etc., unless otherwise specifically defined.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment
, it is not intended that in limitation the application.Term " and or " used herein includes one or more relevant listed items
Any and all combinations.
Fig. 1 is a kind of structural schematic diagram of the POC system provided in one embodiment, as shown in Figure 1, POC system includes
Feeder ear 110 and receiving end 120.Wherein, receiving end 120 can be video camera, and for shooting vision signal, feeder ear 110 is wrapped
Power module and back-end storage device are included, power module is powered to back-end storage device and video camera；Back-end storage device is used for
Store the vision signal that video camera is sent.Power module can integrate with back-end storage device and be integrated.
When feeder ear 110 is powered to receiving end 120, the circulation path of electric current is the equivalent of power module-feeder ear 110
Equivalent isolated impedance-receiving end 120 of isolated impedance-A-B- receiving end 120；When receiving end 120 stores equipment transmission to the back-end
When vision signal, the circulation path of vision signal is the isolation capacitance-B-A- feeder ear 110 of receiving end 120- receiving end 120
Isolation capacitance-back-end storage device.It is therefore seen that section A-B route transmits electric current transmission video signal, i.e. section A-B route again
For POC route, to realize supply power coaxially.
Surge (Electrical surge), as the term suggests being exactly to occur moment exceeding the peak value of stationary value, it includes wave
Gush voltage and surge current.Surge is also surging, as the term suggests just it is above the transient overvoltage of normal working voltage.Substantially
It says, surge is a kind of violent pulse occurred within only several hundred times a ten thousandth second.The reason of may cause surge has: weight
Type equipment, short circuit, power supply switching, big-block engine and lightning induction energy etc..It can be effective by setting surging protection circuit
POC system is prevented to be damaged.
Fig. 2 is a kind of schematic diagram of the surging protection circuit provided in one embodiment, and Fig. 3 is to provide in one embodiment
A kind of surging protection circuit circuit diagram, as shown in Figures 2 and 3, surging protection circuit includes: coaxial interface J, video module
111, power module 112, signal branch, power branch and common branch, coaxial interface J pass through common branch and signal branch
Road is connect with video module 112, and coaxial interface J is connect by common branch and power branch with power module 111, signal branch
Road includes capacitance C and the first protection circuit 210；
Video module 111 passes sequentially through the first protection circuit 210 and capacitance C is connected to common branch, and first is anti-
Protection circuit 210 is used for the surge current released in signal branch.
Coaxial interface J is arranged on the POC route in Fig. 1, and the one end coaxial interface J connects feeder ear 110, other end connection
Receiving end 120.Coaxial interface J connection feeder ear 110 is similar with the operating mode of receiving end 120, therefore the present embodiment is with coaxial
Interface J connection feeder ear is illustrated for 110 side, and the specific restriction about 120 side of coaxial interface J connection receiving end can
With referring to the restriction for 110 side of coaxial interface J connection feeder ear, details are not described herein.
Back-end storage device in 111 corresponding diagram 1 of video module, for storing the video of 120 camera transmissions of receiving end
Signal, power module 112 can power to back-end storage device and 120 equipment of receiving end.Signal branch be video module 111 to
Route between O point, for the back-end storage device in corresponding diagram 1 to the route between A point, signal branch is only used for transmission video letter
Number；Power branch is power module 112 to the route between O point, the power module in corresponding diagram 1 to the route between A point, electricity
Source branch is only used for transmission electric current.The tie point of coaxial interface J and signal branch, power branch, i.e. O point connection, form public
Branch is used for transmission power supply signal and vision signal, i.e. signal on common branch is that power supply is superimposed high-definition video signal.Coaxially
Interface J is connect by common branch and signal branch with video module 111, for by the video signal transmission of camera transmissions
To video module 111；Coaxial interface J is connect by common branch and power branch with power module 112, is used for power supply mould
The electric current that block 112 transmits is transmitted to 120 video camera of receiving end.
Surging protection circuit include the first protection circuit 210, the first protection circuit 210 setting video module 111 with every
Between straight capacitor C, for the surge current in signal branch of releasing.
In one embodiment, the first protection circuit 210 includes the first protective device, one end of the first protective device and video
Module 111 is connected with the tie point of capacitance C, the other end ground connection of the first protective device；First protective device is put for gas
Fulgurite, unidirectional transient state inhibit any one of diode or voltage switch type Transient Suppression Diode.
First protective device is first order protection, protects signal branch.Due to being signal end, afterflow effect is not had, institute
Gas-discharge tube (Gas Discharge Tube, GDT) can be used, the first protective device herein is also possible to semiconductor
Discharge tube or Transient Suppression Diode (Transient Voltage Suppressor, TVS), as long as parasitic capacitance meets signal
Transmission requirement and surge power meet corresponding surge grade.GDT in this way, selects operation voltage 90V, and capacitor is less than
The GDT of 1pF, semiconductor discharge tube (Thyristor Surge Suppressors, TSS) in this way select operating voltage 6V, electricity
Hold TSS, the TVS in this way for being less than 10pF, select operating voltage 5V, capacitor is less than the TVS of 10pF.As shown in figure 3, the present embodiment
In, the first protective device is gas-discharge tube GDT2.
Capacitance C is arranged between common branch and the first protection circuit 210, for the view for being mixed with DC power supply
Frequency signal carries out blocking processing.Capacitance C is usually the biggish capacitor of capacitance, in the present embodiment, the capacitor of capacitance C
Value is greater than 100 μ F.It is Low ESR (access), surge for surge current when the capacitance of capacitance C is larger
Electric current easily passes through capacitance C, therefore, the first protection circuit 210 is provided between capacitance C and video module 111,
Can release surge current.
When surge is come in from coaxial interface, most of surge can pass through capacitance C, flow through the surge of capacitance C
It is released by first order protection circuit 210, so there will not be very high voltage on POC route.For inferior grade
Surge, surge voltage can be clamped down in reduced levels by the first protection circuit 210.Pass through the blocking electricity in signal branch
Hold and the first protection circuit 210 is set behind C can release surge current, so that surge will not influence the power branch and letter of rear class
Late-class circuit damage can be effectively prevented in number branch.
Surging protection circuit provided in this embodiment includes: coaxial interface J, video module 111, power module 112, signal
Branch, power branch and common branch, coaxial interface J are connect by common branch and signal branch with video module 111,
Coaxial interface J is connect by common branch and power branch with power module 112, signal branch include capacitance C and
First protection circuit 210；Video module 111 passes sequentially through the first protection circuit 210 and capacitance C is connected to public branch
Road, the first protection circuit 210 are used for the surge current released in signal branch.By being set between capacitance and video module
Set the first protection circuit, so that it may which the surge current of inferior grade in signal branch of effectively releasing prevents circuit devcie in POC system
Damage.
In one embodiment, the second protection circuit 220 and build-out resistor R1, video module are additionally provided in signal branch
111 pass sequentially through the second protection circuit 220, build-out resistor R1, the first protection circuit 210 and capacitance C be connected to it is public
Branch；One end of second protection circuit 220 is connect with the tie point of video module 111 and build-out resistor R1, the second protection circuit
220 other end ground connection.
The wave between capacitance C and build-out resistor R1, for releasing in signal branch is arranged in second protection circuit 220
Gush electric current.
Setting build-out resistor R1 is to provide for signal source and loads a kind of suitable collocation mode, i.e. matching video camera
With back-end storage device.Build-out resistor R1 is also used to control the voltage of signal branch rear class when a surge arises.
In one embodiment, the second protection circuit 220 includes the second protective device, and the second protective device is that transient state inhibits two
One end of grade pipe TVS3, TVS3 are connect with the tie point of build-out resistor R1 and video module 111, the other end ground connection of TVS3.The
Two protective devices are the device of rear class protection circuit, for not releasing completely wave in prime protection circuit i.e. the first protection circuit
It further releases in the case where gushing to surge, therefore the general small-power of the second protective device.Such as second level carrying out surge protection
Device selects operating voltage for 3.3V, and capacitor is less than the TVS of 1pF.
TVS surge absoption ability with higher, when its both ends are subjected to the high energy impact events of moment, TVS can be with pole
Impedance value between both ends is become Low ESR from high impedance by fast speed, to absorb the high current of a moment, its both ends
Voltage clamp one it is scheduled numerically, so that subsequent circuit element be protected not influenced by surge current.
In one embodiment, power branch is equipped with inductance L and third protection circuit 230；Power module 112 successively leads to
Cross third protection circuit 230 and inductance L be connected to common branch, one end of third protection circuit 230 and power module 112 and
The connection of inductance L tie point, the other end ground connection of third protection circuit 230.
Inductance L selects hundred uH grades of inductance, is used for isolation signals, has decoupling effect to surge.
Third protection circuit 230 is used for protection power source branch, and third protection circuit 230 includes concatenated third protective device
With rectifier bridge D1.Third protective device can choose the Transient Suppression Diode TVS2 of 58V operating voltage.Third protection circuit string
Connection rectifier bridge D1 is the parasitic capacitance in order to reduce third protection circuit 230.Since close to signal source, vision signal is passed through herein
Have an impact after inductance L to vision signal, so to select the protection circuit of small capacitances.As shown in figure 3, rectifier bridge is by bridge-type
Four diode packages of rectification are together.It is understood that rectifier bridge is also possible to two diode a positive and a negative parallel connections,
It is through-flow enough as long as parasitic capacitance is small, the function of realization be also it is the same, since TVS clamper is low, rectifier bridge conduction voltage drop is also low,
Late-class circuit is protected not to be affected by surge enough.
Fig. 4 is a kind of circuit diagram of the surging protection circuit provided in another embodiment, as shown in figure 4, carrying out surge protection
Circuit further includes the 4th protection circuit 240, and one end of the 4th protection circuit 240 is connect with common branch, the 4th protection circuit
Other end ground connection, for the surge current on common branch of releasing.
4th protection circuit includes concatenated 4th protective device and gas-discharge tube GDT1, and the 4th protective device can be
Transient Suppression Diode TVS1, the 4th protective device TVS1 in this way select 58V operating voltage.TVS can be used clamper compared to
Slightly higher pressure-sensitive of TVS replaces.First protective device is pressure-sensitive in this way, then selects that 65Vdc's is pressure-sensitive.
For the capacitance of GDT1 less than the capacitance of the first protective device, series connection GDT1 is to reduce the first protection circuit
210 whole capacitances.Single TVS1 parasitic capacitance is larger, can have an impact to the transmission of high-frequency signal.In vision signal
It is more sensitive to the parasitic capacitance of protective device with high-frequency signal, the transmission of vision signal can be seriously affected.The present embodiment
In, GDT1 can choose 90V operation voltage, and capacitance is less than the GDT1 of 1pF, if TVS1 is the junction capacity of 1000pF, on string
After the GDT1 of 1pF, integral capacitor is less than 1pF.The integral capacitor value of the 4th protection circuit 240, a side are reduced by series connection GDT1
Face is conducive to improve the transmission quality of high-definition video signal, on the other hand it is possible to prevente effectively from the afterflow effect of GDT1 is used alone
It answers.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of surging protection circuit, the surging protection circuit includes: coaxial interface, video module, power module, signal branch
Road, power branch and common branch, the coaxial interface pass through the common branch and signal branch and the video screen module
Block connection, the coaxial interface pass through the connection of power module described in the common branch and power branch, which is characterized in that institute
Stating signal branch includes capacitance and the first protection circuit；
The video module passes sequentially through first protection circuit and capacitance is connected to common branch, and described first is anti-
Protection circuit is used for the surge current released in the signal branch.
2. surging protection circuit according to claim 1, which is characterized in that first protection circuit includes the first protection
One end of device, first protective device is connect with the tie point of the video module and capacitance, first protection
The other end of device is grounded；First protective device is gas-discharge tube, unidirectional transient state inhibition diode or voltage switch type
Any one of Transient Suppression Diode.
3. surging protection circuit according to claim 2, which is characterized in that the capacitance of the capacitance is greater than 100 μ
F。
4. surging protection circuit according to claim 1, which is characterized in that it is anti-to be additionally provided with second in the signal branch
Protection circuit and build-out resistor, the video module pass sequentially through the second protection circuit, the build-out resistor, the first protection circuit
And capacitance is connected to common branch；One end of second protection circuit and the company of the video module and build-out resistor
Contact connection, the other end ground connection of second protection circuit.
5. surging protection circuit according to claim 4, which is characterized in that second protection circuit includes the second protection
Device, the second protective device are that transient state inhibits diode.
6. surging protection circuit according to claim 5, which is characterized in that the transient state inhibits the capacitance of diode small
In 1pf.
7. according to claim 1 or 4 described in any item surging protection circuits, which is characterized in that the power branch is equipped with
Inductance and third protection circuit；
The power module passes sequentially through the third protection circuit and inductance connection to common branch, the third protection electricity
The one end on road is connect with the tie point of the power module and inductance, the other end ground connection of the third protection circuit.
8. surging protection circuit according to claim 7, which is characterized in that the third protection circuit includes concatenated
Three protective devices and rectifier bridge.
9. surging protection circuit according to claim 7, which is characterized in that the surging protection circuit further includes the 4th anti-
Protection circuit,
One end of 4th protection circuit is connect with the common branch, and the other end ground connection of the 4th protection circuit is used
Surge current on the common branch of releasing.
10. surging protection circuit according to claim 9, which is characterized in that the 4th protection circuit includes concatenated
4th protective device and gas-discharge tube.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910596669.4A CN110401181B (en) | 2019-07-02 | 2019-07-02 | Surge protection circuit |
| EP20834195.8A EP3973606A4 (en) | 2019-07-02 | 2020-03-30 | Eletrical surge protection circuits |
| PCT/CN2020/082124 WO2021000611A1 (en) | 2019-07-02 | 2020-03-30 | Eletrical surge protection circuits |
| US17/645,983 US11764569B2 (en) | 2019-07-02 | 2021-12-25 | Electrical surge protection circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910596669.4A CN110401181B (en) | 2019-07-02 | 2019-07-02 | Surge protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110401181A true CN110401181A (en) | 2019-11-01 |
| CN110401181B CN110401181B (en) | 2022-03-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910596669.4A Active CN110401181B (en) | 2019-07-02 | 2019-07-02 | Surge protection circuit |
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| Country | Link |
|---|---|
| CN (1) | CN110401181B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021000611A1 (en) * | 2019-07-02 | 2021-01-07 | Zhejiang Dahua Technology Co., Ltd. | Eletrical surge protection circuits |
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| EP3128633A1 (en) * | 2015-08-07 | 2017-02-08 | Abb Ag | Transient over voltage and lightning protection of power connected equipment |
| CN105827247A (en) * | 2016-03-21 | 2016-08-03 | 成都天进仪器有限公司 | Small signal output circuit for intelligent relay protection tester |
| CN106210668A (en) * | 2016-08-31 | 2016-12-07 | 杭州中威电子股份有限公司 | Web-transporting device based on EOC |
| CN206595710U (en) * | 2017-03-28 | 2017-10-27 | 深圳中兴力维技术有限公司 | Lightning protection circuit, lightning protection device and electronic equipment |
| CN107204361A (en) * | 2017-05-22 | 2017-09-26 | 安徽富芯微电子有限公司 | A kind of low-capacitance bidirectional TVS device and its manufacture method |
| CN109217279A (en) * | 2017-07-05 | 2019-01-15 | 中国电信股份有限公司 | Surging protection circuit and method for surging protection circuit |
| CN207995240U (en) * | 2018-03-23 | 2018-10-19 | 杭州韬视科技有限公司 | Based on coaxial rear front end for power receiving circuit |
| CN109786471A (en) * | 2018-12-20 | 2019-05-21 | 泉州臻美智能科技有限公司 | A kind of Transient Voltage Suppressor and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021000611A1 (en) * | 2019-07-02 | 2021-01-07 | Zhejiang Dahua Technology Co., Ltd. | Eletrical surge protection circuits |
| US11764569B2 (en) | 2019-07-02 | 2023-09-19 | Zhejiang Dahua Technology Co., Ltd. | Electrical surge protection circuits |
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