CN100414803C - Lightening arresting method and device for Ethernet port - Google Patents
Lightening arresting method and device for Ethernet port Download PDFInfo
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- CN100414803C CN100414803C CNB021253870A CN02125387A CN100414803C CN 100414803 C CN100414803 C CN 100414803C CN B021253870 A CNB021253870 A CN B021253870A CN 02125387 A CN02125387 A CN 02125387A CN 100414803 C CN100414803 C CN 100414803C
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003068 static effect Effects 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 230000001629 suppression Effects 0.000 claims description 6
- 230000001052 transient effect Effects 0.000 claims description 6
- 230000000740 bleeding effect Effects 0.000 claims 2
- 230000002265 prevention Effects 0.000 abstract 4
- 230000006855 networking Effects 0.000 description 10
- 238000010276 construction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 208000025274 Lightning injury Diseases 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The present invention discloses a thunder prevention method for an Ethernet port and a device thereof, wherein the method comprises the steps that a current releasing path of instantaneous high voltage is arranged between the differential lines of the differential pair, and the current releasing path in the most front stage of a prevention circuit is provided by a gas discharge tube; the high voltage produced by thunder and high static voltage between the differential lines can be released by the current releasing path of instantaneous high voltage; the rear stage of the differential circuit adopts a varistor and a TVS tube to process voltage clamping; residual voltage after passing through the gas discharge tube is clamped to a lower voltage value by the varistor and the TVS tube to realize the protection of the rear stage circuit. The thunder prevention device comprises the receiving differential line pair, the sending differential line pair and the current releasing path of instantaneous high voltage; the current releasing path of instantaneous high voltage is respectively connected between the receiving differential line pair and the sending differential line pair. The present invention is mainly used for thunder prevention of the Ethernet, and has advantages of high safety, low cost and flexible network organizing.
Description
Technical Field
The invention relates to a lightning protection device, in particular to a lightning protection method and a lightning protection device for an Ethernet port.
Background
With the strong construction of domestic broadband metropolitan area networks, more and more ethernet switches are adopted as access devices for users in enterprise networks and broadband cells. With the expansion and deterioration of the application environment of the switch, especially the use in the corridor, operators require to improve the security performance of the ethernet port and increase the lightning protection capability of the port to meet the requirement of reliable and long-distance equipment.
The Ethernet port with the lightning protection function can resist lightning and static electricity, support a more severe networking environment and effectively improve the safety of network equipment and other electrical equipment, so that more and more attention is paid to the Ethernet port in enterprise network and broadband networking application.
Currently, no other effective Ethernet port lightning protection means exist in the market. In a specific networking mode, the Ethernet equipment can only take certain precaution against natural disasters such as lightning stroke, high-voltage static electricity and the like by adopting construction means such as deep burying and the like. The disadvantages of this approach are:
1. the safety is poor. The method of deep-buried network cable can only protect the uplink port or other important Ethernet user interfaces generally, and the network cables of other interfaces are open air, so the risk of lightning strike and static electricity still exists.
2. The cost is high. In general construction means, the cost of manpower and material resources is high, and the construction period is often prolonged.
Disclosure of Invention
The invention aims to provide a method and a device for preventing Ethernet from lightning, which are used for improving the security of a network, reducing the cost and the like.
The method of the invention comprises the following steps:
providing a current leakage path of instantaneous high voltage between the differential lines of the differential line pair; wherein, the current discharge path adopts a two-stage protection mode;
the high voltage generated by lightning and high-voltage static electricity between the differential lines is released by the instantaneous high-voltage current leakage path.
According to the above method: the two-stage protection mode is as follows: a front stage protection device and a rear stage protection device are respectively connected between the front stage differential line and the rear stage differential line, and an impedance device is connected in series between the front stage protection device and the rear stage protection device.
The front-stage protection device is an air discharge tube connected between front-stage differential lines, the rear-stage protection device is a voltage clamping type transient suppression diode connected between rear-stage differential lines, and the impedance device is a piezoresistor.
The current leakage path is arranged outside the Ethernet port or at the rear stage of the Ethernet port.
The lightning protection device of the present invention comprises:
the current bleeder circuit receives the differential line pair, sends the differential line pair and instantaneous high voltage; wherein,
the current bleeder circuit of the instantaneous high voltage includes: the protection circuit includes a preceding stage protection device connected to a preceding stage differential line, a succeeding stage protection device connected to a succeeding stage differential line, and an impedance device connected in series between the preceding stage protection device and the succeeding stage protection device.
According to the lightning protection device: the front-stage protection device is an air discharge tube, the rear-stage protection device is a voltage clamping type transient suppression diode, and the impedance device is a piezoresistor.
And two ends of the differential line pair are respectively and electrically connected with a plug or a slot so as to be conveniently connected with other equipment.
The invention has the following effects:
1. the safety is high: the design of a built-in or external lightning protection module is adopted on the Ethernet equipment, so that the lightning damage probability of the equipment can be reliably reduced. Meanwhile, high-voltage danger caused by other electrical equipment can be effectively avoided, and high-voltage danger caused by other electrical equipment is avoided.
2. The cost is low: by adopting the invention, the construction amount of projects such as trenching and the like can be reduced, and the networking cost is reduced.
3. Networking is flexible: by adopting the invention, the Ethernet equipment can be matched with the lightning protection module or circuit according to the actual requirement, thereby being suitable for the complex networking environment. And in addition, network management and maintenance are facilitated.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
figure 2 is a circuit schematic of another configuration of the present invention,
fig. 3 is a circuit schematic of yet another configuration of the present invention.
FIG. 4 is a networking diagram of the lightning protection device of the present invention external to an Ethernet device;
fig. 5 is a networking diagram of the lightning protection device of the present invention inside an ethernet device.
Detailed Description
The invention provides an instantaneous high-voltage current leakage path between differential lines of an Ethernet differential line pair, when high voltage is generated between the differential lines in the Ethernet due to thunder and high-voltage static electricity, the instantaneous high-voltage current leakage path releases the high voltage to prevent the thunder and high-voltage static electricity from entering the Ethernet equipment to damage circuits and devices.
Referring to FIG. 1, differential line rx+、rx-Sum differential line tx+、tx-Voltage clamping Transient suppression diodes (TVS tubes for short) VD1 and VD2 are respectively connected between the two diodes. The TVS tubes VD1 and VD2 are integrated in one tube, which is model SLVU 2-8.4. Two pairs of differential pairs are connected to sockets or plugs to facilitate connection to other devices. The TVS tube is a voltage-limiting protection device, and realizes the protection of a post-stage circuit by clamping overvoltage to a lower voltage value by utilizing the nonlinear characteristic of the device. When instantaneous high voltage is generated between differential lines due to lightning and the like, the TVS tube clamps the high voltage, and the structure performs single-stage protection on 10/100BASE-T Ethernet ports.
Referring to fig. 2, the structure is shown using an air discharge tube, model 3r097cxa — 2, as a high voltage discharge path. The air discharge tube is a switch-type protection device, and the working principle is gas discharge. When the voltage between the two electrodes is large enough, the gap between the electrodes breaks down the discharge, and the original insulation state is converted into a conductive state, which is similar to a short circuit. The voltage maintained between the two electrodes is very low, generally 20-50V, under the conducting state, so that the effect of protecting a rear-stage circuit can be achieved. This structure mainly discharges high voltage caused by static electricity or the like.
Referring to fig. 3, the illustrated structure uses a voltage clamping Transient suppression diode (TVS tube) and an air discharge tube as a current leakage path and a voltage clamping circuit for instantaneous high voltage to perform two-stage protection on 10/100BASE-T ethernet port. Differential line rx+、rx-Sum differential line tx+、tx-Air discharge tubes G1 and G2, TVS tubes VD1 and VD2 are connected between them. The model of TVS tube is SLVU2_8.4, and the model of air discharge tube is 3r097cxa _ 2. The TVS tube and the air discharge tube are connected by adopting 2W high-power piezoresistors R1, R2, R3 and R4.
The piezoresistor is a voltage-limiting type protection device. By utilizing the nonlinear characteristic of the piezoresistor, when an overvoltage appears between two poles of the piezoresistor, the piezoresistor can clamp the voltage to a relatively fixed voltage value.
When high voltage is generated between the differential lines, the voltage between the two electrodes of the air discharge tube is large enough, and the discharge is broken through by the gap between the two electrodes, so that the original insulation state is converted into a conductive state, which is similar to a short circuit. The voltage maintained between the two electrodes in the conductive state is very low, generally 20-50V. The voltage dependent resistor and the TVS tube clamp the overvoltage to a lower voltage value, thereby realizing the protection of a post-stage circuit.
FIG. 4 is a networking diagram of a lightning protection module placed outside an Ethernet device. The whole lightning protection module is connected outside the Ethernet port, namely between the network port connector RJ45 and the user equipment PC, and is made into an independent lightning protection device.
Fig. 5 shows the lightning protection module arranged in the rear stage of the port, i.e. between the network port connector RJ45 and the network port transformer, as part of the ethernet device.
The lightning protection device of the embodiment mainly protects 10/100 receiving and transmitting differential line pairs of the BASE-T Ethernet port. By adopting the method or the device, the port of the Ethernet equipment can resist the instantaneous current of 10KA to the maximum extent, and meanwhile, the circuit is stable and reliable and can completely meet the networking requirement of the Ethernet equipment.
Claims (7)
1. A lightning protection method for an Ethernet port is characterized in that:
providing a current leakage path of instantaneous high voltage between the differential lines of the differential line pair; the current leakage path adopts a two-stage protection mode; the two-stage protection mode is as follows: a front stage protection device and a rear stage protection device are respectively connected between the front stage differential line and the rear stage differential line, and an impedance device is connected in series between the front stage protection device and the rear stage protection device; the high voltage generated by lightning and high-voltage static electricity between the differential lines is released by the instantaneous high-voltage current leakage path.
2. The method of claim 1, wherein the preceding stage protection device is an air discharge tube connected between preceding stage differential lines, the subsequent stage protection device is a voltage clamp type transient suppression diode connected between subsequent stage differential lines, and the impedance device is a varistor.
3. Method according to one of claims 1 to 2, characterized in that the current bleeding path is arranged outside the ethernet port.
4. The method according to any one of claims 1 to 2, wherein the current bleeding path is provided at a stage subsequent to the ethernet port, and is a part of an ethernet device.
5. A lightning protection device for an ethernet port, comprising: the current bleeder circuit receives the differential line pair, sends the differential line pair and instantaneous high voltage; wherein,
the current bleeder circuit of the instantaneous high voltage includes: the protection circuit includes a preceding stage protection device connected to a preceding stage differential line, a succeeding stage protection device connected to a succeeding stage differential line, and an impedance device connected in series between the preceding stage protection device and the succeeding stage protection device.
6. The lightning protection device according to claim 5, wherein the front stage protection device is an air discharge tube, the rear stage protection device is a voltage clamping transient suppression diode, and the impedance device is a varistor.
7. The lightning protection device according to any one of claims 5 to 6, wherein both ends of the differential line pair are electrically connected to a plug or a socket, respectively, so as to facilitate connection with other equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021253870A CN100414803C (en) | 2002-07-30 | 2002-07-30 | Lightening arresting method and device for Ethernet port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021253870A CN100414803C (en) | 2002-07-30 | 2002-07-30 | Lightening arresting method and device for Ethernet port |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1472859A CN1472859A (en) | 2004-02-04 |
| CN100414803C true CN100414803C (en) | 2008-08-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021253870A Expired - Fee Related CN100414803C (en) | 2002-07-30 | 2002-07-30 | Lightening arresting method and device for Ethernet port |
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| Country | Link |
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| CN (1) | CN100414803C (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101247236B (en) * | 2008-03-19 | 2010-07-21 | 杭州华三通信技术有限公司 | Ethernet power receiving equipment and its protection method |
| CN101477881B (en) * | 2008-10-14 | 2011-06-15 | 华为终端有限公司 | Lightning protection transformer and lighting protection method for transformer |
| CN101719665B (en) * | 2009-12-24 | 2013-02-20 | 迈普通信技术股份有限公司 | Ethernet port lightning protection device and lightning protection circuit |
| CN102593816A (en) * | 2012-03-06 | 2012-07-18 | 深圳市海鹏信电子股份有限公司 | Surge protection device of gigabit active Ethernet |
| CN102684181A (en) * | 2012-05-14 | 2012-09-19 | 江苏中科梦兰电子科技有限公司 | Anti-static and lightning-prevention dual protection circuit |
| CN102723706B (en) * | 2012-05-30 | 2015-08-19 | 武汉烽火网络有限责任公司 | PoE port overvoltage integrated protection circuit and its implementation |
| CN103515942B (en) * | 2012-06-28 | 2017-12-22 | 中兴通讯股份有限公司 | The protection circuit of communication interface |
| CN103297700A (en) * | 2013-06-04 | 2013-09-11 | 四川艾普视达数码科技有限公司 | Lightening-preventing web camera |
| CN108882059A (en) * | 2017-05-10 | 2018-11-23 | 内江师范学院 | A kind of 10M/100M local area network distributing frame lightening arresting method |
| CN107623316A (en) * | 2017-10-12 | 2018-01-23 | 郑州云海信息技术有限公司 | A kind of server port lightning preventing hits design method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6115226A (en) * | 1998-12-07 | 2000-09-05 | Cisco Technology, Inc. | Apparatus for lightning strike survivability and post-strike operability |
| CN1359182A (en) * | 2001-12-31 | 2002-07-17 | 深圳安圣电气有限公司 | Signal lightning protector |
-
2002
- 2002-07-30 CN CNB021253870A patent/CN100414803C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6115226A (en) * | 1998-12-07 | 2000-09-05 | Cisco Technology, Inc. | Apparatus for lightning strike survivability and post-strike operability |
| CN1359182A (en) * | 2001-12-31 | 2002-07-17 | 深圳安圣电气有限公司 | Signal lightning protector |
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| CN1472859A (en) | 2004-02-04 |
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