CN109217279A - Surging protection circuit and method for surging protection circuit - Google Patents
Surging protection circuit and method for surging protection circuit Download PDFInfo
- Publication number
- CN109217279A CN109217279A CN201710539962.8A CN201710539962A CN109217279A CN 109217279 A CN109217279 A CN 109217279A CN 201710539962 A CN201710539962 A CN 201710539962A CN 109217279 A CN109217279 A CN 109217279A
- Authority
- CN
- China
- Prior art keywords
- capacitor
- gas
- protection circuit
- discharge tube
- suppression diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
- H02H9/025—Current limitation using field effect transistors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of surging protection circuit and for the method for surging protection circuit, it is related to field of circuit technology.Surging protection circuit includes: gas-discharge tube, is connected across between the two lines road of differential line pair, and first end and second end is connect with the input terminal of the high level of differential line centering and low level route respectively；Capacitor, positioned at the high level route of differential line centering, the first end connection of first end and gas-discharge tube, its second end are connect with Transient Suppression Diode；Transient Suppression Diode is connected across between the two lines road of differential line pair, and the second end of the connection of the second end of first end and capacitor, its second end and gas-discharge tube connects.The present invention by using gas-discharge tube release surge impact main energetic, release burr tip energy using with the concatenated Capacitor apart DC energy of input terminal and using Transient Suppression Diode, carrying out surge protection effectively can be carried out to high speed signal, and small to the decaying of high speed signal.
Description
Technical field
The present invention relates to field of circuit technology, in particular to a kind of surging protection circuit and the side for surging protection circuit
Method.
Background technique
Surge refer to moment occur be more than stationary value voltage value or current value peak value, be generation it is several hundred very much
One of a kind of violent pulse in time second.The reason of may cause surge has short circuit, power supply switching, lightning stroke etc..Thus, it is existing
Have and devise surge protective device in technology, to effectively absorb the huge energy of burst, protection connection equipment is from impaired.
Currently, TBU (Transient Blocking Units, transient state can be used when the higher signal of delivery rate
Blocking unit) carry out carrying out surge protection.TBU is a kind of design scheme of integrated circuit, using MOSFET (Metal-Oxide-
Semiconductor Field-Effect Transistor, Metal-Oxide Semiconductor field effect transistor) semiconductor skill
Art is made.
Summary of the invention
Inventors have found that the design scheme cost of TBU is relatively high, therefore the cost of carrying out surge protection can be raised.
In view of the above-mentioned problems, the invention proposes the solution party that a kind of pair of high speed signal carries out the low cost of carrying out surge protection
Case.
First aspect according to an embodiment of the present invention provides a kind of surging protection circuit, comprising: gas-discharge tube, across
It connects between the two lines road of differential line pair, the first end and second end of the gas-discharge tube height with differential line centering respectively
The input terminal of level route is connected with the input terminal of low level route；Capacitor, on the high level route of differential line centering,
The first end of capacitor and the first end of gas-discharge tube connect, the second end of capacitor is connect with Transient Suppression Diode；Transient state suppression
Diode processed is connected across between the two lines road of differential line pair, the first end of Transient Suppression Diode and the second end of capacitor
The second end of connection, the second end of Transient Suppression Diode and gas-discharge tube connects.
In one embodiment, the capacitance of capacitor is in 10 nanofarads between 24 nanofarads.
In one embodiment, the voltage value of capacitor is less than 50 volts.
In one embodiment, the capacitance of Transient Suppression Diode is not more than 0.5 pico farad.
In one embodiment, surging protection circuit further include: resistance, the first end of resistance and Transient Suppression Diode
First end connects, the second end of resistance is connect with the output end of the high level route of differential line centering.
In one embodiment, surging protection circuit further include: resistance, the first end of resistance and Transient Suppression Diode
Second end connects, the second end of resistance is connect with the output end of the low level route of differential line centering.
In one embodiment, the resistance value of resistance is less than 10 ohm.
In one embodiment, there is no other elements between the first end of capacitor and the first end of gas-discharge tube.
In one embodiment, surging protection circuit further include: electrostatic protection device, the first end of electrostatic protection device with
The first end connection of gas-discharge tube, the second end of the second end of electrostatic protection device and gas-discharge tube connect.
The second aspect according to an embodiment of the present invention provides a kind of method for surging protection circuit, comprising: by gas
The first end and second end of body discharge tube respectively with the input terminal of the high level route of differential line centering and low level route
Input terminal connection；The first end of capacitor and the first end of gas-discharge tube are connected, the second end of capacitor and transient state are inhibited two
Pole pipe connection；By the first end of Transient Suppression Diode and the connection of the second end of capacitor, by the second end of Transient Suppression Diode
It is connect with the second end of gas-discharge tube.
One embodiment in foregoing invention have the following advantages that or the utility model has the advantages that the present invention by using gas-discharge tube
Release surge impact main energetic, using with the concatenated Capacitor apart DC energy of input terminal and using transient state inhibit two poles
Pipe is released burr tip energy, effectively can carry out carrying out surge protection to high speed signal, and small to the decaying of high speed signal, drop
The low influence to signal quality.
By referring to the drawings to the detailed description of exemplary embodiment of the present invention, other feature of the invention and its
Advantage will become apparent.
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
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram of one embodiment of surging protection circuit of the present invention.
Fig. 2 is the circuit diagram of another embodiment of surging protection circuit of the present invention.
Fig. 3 is the application schematic diagram of one embodiment of surging protection circuit of the present invention.
Fig. 4 is flow chart of the present invention for one embodiment of the method for surging protection circuit.
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.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
The surging protection circuit that the embodiment of the present invention provides includes at least gas-discharge tube, capacitor and transient state and inhibits two poles
Pipe.Exemplary embodiment is described below, to describe the feature of connection relationship and component between wherein all parts.
Fig. 1 is the circuit diagram of one embodiment of surging protection circuit of the present invention.As shown in Figure 1, the embodiment
Surging protection circuit has differential line pair, and two lines road is respectively high level route and low level route.It is difference on the left of Fig. 1
Two input terminals of route pair, the respectively input terminal 17 of the input terminal 16 of high level route and low level route；Right side is poor
Two output ends of separated time road pair, the respectively output end 19 of the output end 18 of high level route and low level route.
Device in the surging protection circuit of the embodiment includes: that gas-discharge tube 11, capacitor 12 and transient state inhibit two poles
Manage (Transient Voltage Suppressor, TVS) 13.In this embodiment, the statement of " first end " and " second end "
It is restricted without serving to the present invention just to distinguish the different ends of same device.
Gas-discharge tube 11 is connected across between the two lines road of differential line pair, 11 first ends of gas-discharge tube and second
End is connect with the input terminal 17 of the input terminal 16 of the high level route of differential line centering and low level route respectively.Gas discharge
Pipe 11 can release the main energetic of surge impact.
Gas-discharge tube 11 is in parallel with input terminal, also, gas-discharge tube 11 is that distance is defeated in above three component
Enter to hold recently.
Capacitor 12 is located on the high level route of differential line centering, and the of the first end of capacitor 12 and gas-discharge tube 11
One end connects, the second end of capacitor 12 is connect with Transient Suppression Diode 13.
Capacitor 12 be it is concatenated with input terminal, between gas-discharge tube 11 and Transient Suppression Diode 13.
In the prior art, can be in parallel with input terminal progress by capacitor, using capacitor as the bypass for being used for leakage current
Capacitor.However, this design of similar shunt capacitance can weaken the radio-frequency component in signal, the decaying of signal is caused.Also,
When transmitting signal, attenuation degree can increase with signal rate.
In order to reduce the influence to the signal quality of high speed signal, the present invention is connected using capacitor 12 with input signal, will
Capacitor 12 is used as capacitance.After remaining DC energy enters capacitor 12 after gas-discharge tube 11 is released, electricity
Hold 12 and these remaining DC energies are imported into gas-discharge tube 11 again again, energy is released again.
To, capacitor 12 in the present invention can isolated DC energy to carry out carrying out surge protection, while again to signal quality
Influence it is smaller.
Capacitor 12 can be placed close to the input terminal of surging protection circuit.So as to as early as possible by DC energy carry out every
From to further decrease DC energy influence caused by other devices.
In one embodiment, the first end of capacitor 12 can not have other yuan between the first end of gas-discharge tube 11
Part.
In one embodiment, electrostatic protection device can also be set between gas-discharge tube 11 and capacitor 12, makes quiet
The first end of electric protective device and the connection of the first end of gas-discharge tube, the second end of electrostatic protection device and gas-discharge tube
Second end connection.That is, electrostatic protection device is in parallel with gas-discharge tube 11.Electrostatic protection device can for example inhibit for transient state
Diode.
Capacitor 12 can be the lesser capacitor of capacitance, such as a preset value can be set, and enable the capacitance of capacitor 12
Less than the preset value.To further decrease the decaying to high speed signal.
In one embodiment, the capacitance of capacitor 12 can be in 10nf (nanofarad) between 24nf.
Capacitor 12 can also be the biggish capacitor of voltage value, such as a preset value can be set, and enable the voltage of capacitor 12
Value is greater than the preset value.
In one embodiment, the voltage value of capacitor 12 can be greater than 50V (volt).To be further ensured that DC energy
Isolation.
For example, after the electric discharge of gas-discharge tube 11, voltage is in 30V or so under the scene of part.It for example can choose at this time
The capacitor that voltage value is 50V, capacitance is 12nf is as capacitor 12.To not only reduce costs, but also it can be realized carrying out surge protection
Function.
Transient Suppression Diode 13 is connected across between the two lines road of differential line pair, and the first of Transient Suppression Diode 13
End is connect with the second end of capacitor 12, the second end of Transient Suppression Diode 13 is connect with the second end of gas-discharge tube 11.
Transient Suppression Diode 13 is in parallel with input signal, between capacitor 12 and the output end of surging protection circuit.
Transient Suppression Diode 13 is mainly used for burr tip energy of releasing.
The response time of Transient Suppression Diode is short, therefore can be reacted in the moment for generating surge phenomenon, to lead
Energy out.
In one embodiment, the parasitic capacitance value of Transient Suppression Diode 13 can be less than preset value.Parasitic capacitance one
As refer to the capacitance characteristic that the components such as inductance, resistance, chip pin show at high frequencies.When parasitic capacitance value compared with
Greatly, the radio-frequency component in signal can also be weakened, to will affect the quality of high speed signal.Therefore, the embodiment of the present invention uses
The lesser Transient Suppression Diode of parasitic capacitance value, can further decrease the decaying caused by signal.
For example, the parasitic capacitance value of Transient Suppression Diode 13 can be less than 0.5pf.
It can be using two-way Transient Suppression Diode as Transient Suppression Diode 13, two-way Transient Suppression Diode
Without directionality；It can also be using unidirectional Transient Suppression Diode as Transient Suppression Diode 13, at this point, transient state inhibits
The first end of diode 13 is anode, second end is cathode, that is, by the anode of Transient Suppression Diode 13 and the second of capacitor 12
End connects, the cathode of Transient Suppression Diode 13 is connect with the second end of gas-discharge tube 11.
Above-described embodiment by using gas-discharge tube release surge impact main energetic, using concatenated with input terminal
Capacitor apart DC energy and released burr tip energy using Transient Suppression Diode, can effectively to high speed signal into
Row carrying out surge protection, and it is small to the decaying of high speed signal, reduce the influence to signal quality.
The surging protection circuit of another embodiment of the present invention is described below with reference to Fig. 2.
Fig. 2 is the circuit diagram of another embodiment of surging protection circuit of the present invention.As shown in Fig. 2, the embodiment
Surging protection circuit further include resistance 14, resistance 15.Those skilled in the art can place resistance in surging protection circuit
14, one or two of resistance 15.
Resistance 14, resistance 15 are located at position nearest apart from output end in the surging protection circuit.
The first end of resistance 14 connect with the first end of Transient Suppression Diode 13, the second end of resistance 14 and differential line
The output end 18 of the high level route of centering connects.
The first end of resistance 15 connect with the second end of Transient Suppression Diode 13, the second end of resistance 15 and differential line
The output end 19 of the low level route of centering connects.
That is, electric current after gas coming through discharge tube 11, capacitor 12, Transient Suppression Diode 13, finally flows through resistance 14, electricity
Resistance 15.Resistance can play metering function.
It in one embodiment, can be close to the pipe of chip when two output ends of surging protection circuit connect chip
Foot places resistance 14, resistance 15.
Can using small resistance as resistance 14, resistance 15, that is, resistance 14, resistance 15 resistance value can be less than preset value.
In one embodiment, the resistance value of resistance 14, resistance 15 can be enabled to be less than 10ohm (ohm).To in reduction pair
Under the premise of influencing caused by signal, the DC current for flowing to output port is reduced.
It will be apparent to those skilled in the art that as needed, other elements can also be added in above-mentioned each embodiment,
To realize the circuit of different function.
Surging protection circuit provided by the invention can be applied to the transmission of video monitoring signal.It is described below with reference to Fig. 3
The surging protection circuit application schematic diagram of one embodiment of the invention.
Fig. 3 is the application schematic diagram of one embodiment of surging protection circuit of the present invention.As shown in figure 3, in the embodiment
In, signal is inputted via BNC (Bayonet Nut Connector, bayonet nut connector) connector 31, via carrying out surge protection electricity
It is output to behind road in chip 44.In the differential line pair of Fig. 3, top route is high level route, and lower section route is low level
Route.The all parts sequentially introduced respectively in the embodiment are flowed through below as signal.
Gas-discharge tube 32 is in parallel with input terminal, is connected across between the two lines road of differential line pair, gas-discharge tube 32
First end and second end respectively with the input terminal of the input terminal of the high level route of differential line centering and low level route connect
It connects, with the main energetic for surge impact of releasing.
Capacitor 33 is connected in circuit, on the high level route of differential line centering, the first end and gas of capacitor 33
The first end connection of body discharge tube 32, the second end of capacitor 33 are connect with Transient Suppression Diode 34.Capacitor 33 can for example have
There are the capacitance of 12nf and the voltage value of 50V.
Transient Suppression Diode 34 is in parallel with input terminal, is connected across between the two lines road of differential line pair, and transient state inhibits
The first end of diode 34 connect with the second end of capacitor 33, the second end of Transient Suppression Diode 34 and gas-discharge tube 32
Second end connection, with burr tip energy of releasing.
Then, signal can flow through BALUN (the Balance To Unbalance for carrying out video processing
Transformer equilibrates to balun), i.e. balun circuit.Balun has extensively in fields such as radio frequency, video and audios
General application, such as in video field, the signal that unbalanced coaxial cable transmits can be changed into the signal of balance by balun.
It for example may include inductance 35, resistance 36 and resistance 37 in balun circuit.
Transient Suppression Diode 38 is in parallel with input terminal, with the burr tip energy that continues to release.
Then, signal can flow through resistance 39, capacitor 40 and capacitor 41.
Resistance 42 and resistance 43 are located near the output end of surging protection circuit, to limit the electric current of output.
Through the foregoing embodiment, carrying out surge protection can be carried out in field of video transmission.Also, for needing to transmit HD-SDI
The high speed signals such as (High Definition Serial Digital Interface, high-definition digital component serial interface) signal
Application scenarios, the surging protection circuit of the embodiment can reduce while protecting circuit signal decaying, ensure that signal
The quality of transmission.
The method for surging protection circuit of one embodiment of the invention is described below with reference to Fig. 4.
Fig. 4 is flow chart of the present invention for one embodiment of the method for surging protection circuit.As shown in figure 4, the reality
The method for surging protection circuit for applying example includes step S402~S406.
In step S402, by the first end and second end of gas-discharge tube respectively with the high level line of differential line centering
The input terminal on road is connected with the input terminal of low level route.
In gas-discharge tube, capacitor and Transient Suppression Diode these three components that the present invention uses, gas-discharge tube
The position nearest in the input terminal apart from surging protection circuit can be set, so as to the main energy for surge impact of releasing first
Amount.
In step s 404, the first end of capacitor and the first end of gas-discharge tube are connected, by the second end of capacitor with
Transient Suppression Diode connection.
In gas-discharge tube, capacitor and Transient Suppression Diode these three components that the present invention uses, capacitor can be set
The position close in the input terminal second apart from surging protection circuit is set, so as to isolated DC energy.
In step S406, inhibit two by the first end of Transient Suppression Diode and the connection of the second end of capacitor, by transient state
The second end of pole pipe and the second end of gas-discharge tube connect.
In gas-discharge tube, capacitor and Transient Suppression Diode these three components that the present invention uses, transient state inhibits two
The position farthest at distance input end can be set in pole pipe, with burr tip energy of releasing.
Above-described embodiment by using gas-discharge tube release surge impact main energetic, using concatenated with input terminal
Capacitor apart DC energy and released burr tip energy using Transient Suppression Diode, can effectively to high speed signal into
Row carrying out surge protection, and it is small to the decaying of high speed signal, reduce the influence to signal quality.
The present processes and system may be achieved in many ways.For example, can by software, hardware, firmware or
Software, hardware, firmware any combination realize the present processes and system.The said sequence of the step of for the method
Merely to be illustrated, the step of the present processes, is not limited to sequence described in detail above, special unless otherwise
It does not mentionlet alone bright.In addition, in some embodiments, also the application can be embodied as to record program in the recording medium, these programs
Including for realizing according to the machine readable instructions of the present processes.Thus, the application also covers storage for executing basis
The recording medium of the program of the present processes.
Although being described in detail by some specific embodiments of the example to the application, the skill of this field
Art personnel it should be understood that above example merely to be illustrated, rather than in order to limit scope of the present application.The skill of this field
Art personnel are it should be understood that can modify to above embodiments in the case where not departing from the scope and spirit of the present application.This Shen
Range please is defined by the following claims.
Claims (10)
1. a kind of surging protection circuit characterized by comprising
Gas-discharge tube is connected across between the two lines road of differential line pair, the first end and second end of the gas-discharge tube
It is connect respectively with the input terminal of the input terminal of the high level route of differential line centering and low level route；
Capacitor, on the high level route of differential line centering, the of the first end of the capacitor and the gas-discharge tube
One end connects, the second end of the capacitor is connect with Transient Suppression Diode；
Transient Suppression Diode is connected across between the two lines road of differential line pair, the first end of the Transient Suppression Diode
It is connect with the second end of the capacitor, the second end company of the second end of the Transient Suppression Diode and the gas-discharge tube
It connects.
2. surging protection circuit according to claim 1, which is characterized in that the capacitance of the capacitor is in 10 nanofarads to 24
Between nanofarad.
3. surging protection circuit according to claim 1, which is characterized in that the voltage value of the capacitor is less than 50 volts.
4. surging protection circuit according to claim 1, which is characterized in that
The capacitance of the Transient Suppression Diode is not more than 0.5 pico farad.
5. surging protection circuit according to claim 1, which is characterized in that further include:
Resistance, the first end of the resistance connect with the first end of the Transient Suppression Diode, the second end of the resistance with
The output end of the high level route of the differential line centering connects.
6. surging protection circuit according to claim 1, which is characterized in that further include:
Resistance, the first end of the resistance connect with the second end of the Transient Suppression Diode, the second end of the resistance with
The output end of the low level route of the differential line centering connects.
7. surging protection circuit according to claim 5 or 6, which is characterized in that the resistance value of the resistance is less than 10 ohm.
8. surging protection circuit according to claim 1, which is characterized in that the first end of the capacitor is put with the gas
There is no other elements between the first end of fulgurite.
9. surging protection circuit according to claim 1, which is characterized in that further include:
Electrostatic protection device, the first end of the electrostatic protection device connect with the first end of the gas-discharge tube, are described quiet
The second end of electric protective device is connect with the second end of the gas-discharge tube.
10. a kind of method for surging protection circuit characterized by comprising
By the first end and second end of gas-discharge tube respectively with the input terminal and low electricity of the high level route of differential line centering
The input terminal on horizontal line road connects；
The first end of capacitor is connect with the first end of the gas-discharge tube, by the second end and Transient Suppression Diode of capacitor
Connection；
The first end of Transient Suppression Diode is connect with the second end of the capacitor, by the second end of Transient Suppression Diode with
The second end of the gas-discharge tube connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539962.8A CN109217279A (en) | 2017-07-05 | 2017-07-05 | Surging protection circuit and method for surging protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539962.8A CN109217279A (en) | 2017-07-05 | 2017-07-05 | Surging protection circuit and method for surging protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109217279A true CN109217279A (en) | 2019-01-15 |
Family
ID=64992663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710539962.8A Pending CN109217279A (en) | 2017-07-05 | 2017-07-05 | Surging protection circuit and method for surging protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109217279A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401181A (en) * | 2019-07-02 | 2019-11-01 | 浙江大华技术股份有限公司 | A kind of surging protection circuit |
| CN114123149A (en) * | 2021-11-26 | 2022-03-01 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing enhanced port electrostatic protection |
| US11764569B2 (en) | 2019-07-02 | 2023-09-19 | Zhejiang Dahua Technology Co., Ltd. | Electrical surge protection circuits |
-
2017
- 2017-07-05 CN CN201710539962.8A patent/CN109217279A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110401181A (en) * | 2019-07-02 | 2019-11-01 | 浙江大华技术股份有限公司 | A kind of surging protection circuit |
| CN110401181B (en) * | 2019-07-02 | 2022-03-01 | 浙江大华技术股份有限公司 | Surge protection circuit |
| US11764569B2 (en) | 2019-07-02 | 2023-09-19 | Zhejiang Dahua Technology Co., Ltd. | Electrical surge protection circuits |
| CN114123149A (en) * | 2021-11-26 | 2022-03-01 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing enhanced port electrostatic protection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109217279A (en) | Surging protection circuit and method for surging protection circuit | |
| CN203339687U (en) | High speed and high frequency signal port surge protection circuit | |
| US20150180225A1 (en) | Bias voltage circuit for biasing a transient suppression device and apparatus using same | |
| CN106027269B (en) | Ethernet electric equipment and protection circuit thereof | |
| CN202142847U (en) | Multi-stage pressure limiting signal surge protector | |
| CN105048428A (en) | Protective circuit for analog input ports | |
| US11509134B2 (en) | Communication interface protection circuit having transient voltage suppression | |
| CN203027597U (en) | Power adapter and electrostatic discharge protective circuit thereof | |
| CN205791502U (en) | A kind of lightning-protection module | |
| CN104377673A (en) | Surge protective device and method | |
| CN206759047U (en) | A kind of RF joints lightning prevention circuit | |
| CN201616888U (en) | Ethernet optical network unit | |
| CN105740183A (en) | Serial port communication circuit | |
| CN105470936A (en) | Network transformer lightning protection circuit for suppressing common mode surge | |
| CN206790086U (en) | Interface protection circuit and equipment interface | |
| CN110190480B (en) | USB data line | |
| CN203645317U (en) | Anti-thunder module and anti-thunder box | |
| CN205811534U (en) | A kind of Ethernet Surge Protector | |
| CN104333340A (en) | Electromagnetic interference filter | |
| CN103840446B (en) | Circuit used for communication device power source disturbance suppression in transformer substation | |
| CN107579832A (en) | Ethernet interface telecommunication circuit without network transformer | |
| CN207234397U (en) | A kind of lightning protection circuit and electrical equipment | |
| CN207853914U (en) | PoE equipment without network transformer | |
| CN206602359U (en) | A kind of Arinc429 interfaces are based on DO160G lightning Protection Design circuits | |
| CN209896693U (en) | High definition video signal lightning protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190115 |