CN203261022U - Gigabit-network lightning protection device with POE function - Google Patents
Gigabit-network lightning protection device with POE function Download PDFInfo
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- CN203261022U CN203261022U CN 201320189408 CN201320189408U CN203261022U CN 203261022 U CN203261022 U CN 203261022U CN 201320189408 CN201320189408 CN 201320189408 CN 201320189408 U CN201320189408 U CN 201320189408U CN 203261022 U CN203261022 U CN 203261022U
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Abstract
The utility model discloses a gigabit-network lightning protection device with a POE function. The device comprises two RJ45 sockets J1 and J2 and four groups of protection circuits, wherein the two RJ45 sockets J1 and J2 are respectively arranged on an input end and an output end of a network, and the four groups of protection circuits are connected in parallel between J1 and J2, and each group of protection circuit includes a primary lightning discharge circuit and a secondary residual voltage clamping circuit. The gigabit-network lightning protection device is low in junction capacitance, has no impact on network signals, can avoid the influence of grounding crosstalk and can fully protect back-end equipment.
Description
Technical field
The utility model relates to emergency protection circuit device for electric, relates in particular to a kind of Giga network thunder proof device with the POE function.
Background technology
So-called active Ethernet (POE), namely architecture does not make any changes in the situation that existing Ethernet Cat.5/Cat.6 connects up, when being IP-based terminal (terminals such as IP phone, wireless aps, web camera) transmission of data signals, the technology of supplied by AC/DC electricity also is provided, thereby reduces costs to greatest extent.Although the POE technology is widely used, in the process of transmission of data signals, easily be subject to the impact of outdoor direct lightning strike and Lightning Electromagnetic Pulse.For example direct lightning strike directly hits network system equipment and causes damage, and Lightning Electromagnetic Pulse causes damage by circuits such as feeder line, netting twine, power supplys to equipment.In case network system or equipment are struck by lightning, cause device damage, signal interruption, data forever to lose, cause to have a strong impact on.
And existing lightning protection device with the POE function in the market; its protection form is all similar, such as in the signal protection circuit, does second level protective circuit with TVS pipe or TSS pipe; the former has reached the effect that reduces residual voltage; can be but because of the excessive communication quality that affected of its junction capacitance, it is strong that the latter absorbs surge capacity, and but residual voltage is very high; caused rear end protection device damage; but lightning protection device is excellent, when thunderbolt is got on external geodesic, and the phenomenon that exists thunderbolt voltage to play a reversed role.
The utility model content
The utility model is in order to address the above problem; a kind of Giga network thunder proof device with the POE function has been proposed; comprise two RJ45 seat J1 and J2 being located at respectively network input and output, be connected in parallel on four groups of protective circuits between J1 and J2, every group of protective circuit comprises one-level thunder and lightning leadage circuit and the secondary residual voltage clamp circuit that connects successively.
In one embodiment, one-level thunder and lightning leadage circuit comprises two ceramic gas discharge tubes and two resistance, and wherein the input of ceramic gas discharge tube connects respectively two pins of J1, output termination the earth, and resistance is connected on respectively on two grid lines.Secondary residual voltage clamp circuit comprises six fast recovery diodes and a Transient Suppression Diode, wherein six fast recovery diodes are divided into two groups, every group comprises three fast recovery diodes, every group of fast recovery diode one end is connected, the other end is connected with two pins and the earth of J2 respectively, and Transient Suppression Diode is connected between the link of every group of fast recovery diode.Four groups of one-level thunder and lightning leadage circuits and secondary residual voltage clamp circuit series connection one glass gas-discharge pipe connect the earth.
The pin 1,2 of described J1, J2 connects positive source, and the pin 3,6 of J1, J2 connects the negative pole of power supply.
The utility model adopts the ultra-low capacitance design, fast recovery diode and Transient Suppression Diode are connected into combinational circuit, make between line the appearance value lower, the impact of network signal is reduced to minimum, and TVS tube reaction speed is faster than general components and parts, and surge residual voltage clamper is lower.Be provided with in addition the ground connection isolation design, the impact of having avoided ground connection to crosstalk fully makes rear end equipment move more stable, safety.
Description of drawings
Below in conjunction with drawings and Examples, the utility model is described further, wherein:
Fig. 1 is the circuit diagram of the utility model one embodiment.
Embodiment
The Giga network thunder proof device with the POE function that the utility model one embodiment proposes; comprise: be located at respectively network input and output two RJ45 seat J1 and J2, be connected in parallel on four groups of protective circuits between J1 and J2, every group of protective circuit comprises one-level thunder and lightning leadage circuit and the secondary residual voltage clamp circuit that connects successively.The pin 1,2 of using J1, J2 connects the positive pole of DC power supply 48V, and pin 3,6 connects the negative pole of DC power supply 48V, thereby kilomega network is powered, and does not only affect the transmission of network signal data, has also saved the operation that independent transmission of electricity industrial siding is set.
As shown in Figure 1, every group of one-level thunder and lightning leadage circuit comprises two ceramic gas discharge tubes and two resistance, every group of secondary residual voltage clamp circuit comprises six fast recovery diodes and a Transient Suppression Diode, and the below is elaborated as an example of first group of one-level thunder and lightning leadage circuit example.In first group of protective circuit; one-level thunder and lightning leadage circuit comprises G1, G2, R1, R2, and wherein the input of G1, G2 connects respectively two pins 1,2 of J1, and after the output splicing of G1, G2, series connection G9 connects the earth; the protection of formation common mode, resistance is connected on respectively on two grid lines.When the pin port of induction thunder from J1 impacts; electric breakdown phenomena occurs in G1, G2 internal discharge gap immediately; be equivalent to a good conductor this moment; surge voltage namely is short-circuited to rapidly near no-voltage in the time at 50ns; surge current is imported rapidly ground, thereby has realized the protective effect to late-class circuit, has realized the release purpose of the earth of lightning surge; the advantage of ceramic gas discharge tube is that transient power is large, but residual voltage is very high.Therefore be connected on the effect that high-power resistance R1, R2 on grid line played time-delay, buffering.
Secondary residual voltage clamp circuit comprises six fast recovery diodes and a Transient Suppression Diode, similarly, is elaborated as an example of first group of secondary residual voltage clamp circuit example.First group of secondary residual voltage clamp circuit comprises D1, D2, D3, D4, D5, D6 and T1, wherein D1, D2, D3 are one group, D4, D5, D6 are one group, the end of D1, D2, D3 is connected, the end of D4, D5, D6 is connected, and T1 is connected between two tie points, the pin 1 of another termination J2 of D1, D4, the pin 2 of another termination J2 of D3, D6, the output splicing ground connection of the other end of D2, D5 and G1, G2.Through the residue residual voltage of one-level thunder and lightning leadage circuit, under the clamping action of the T1 of secondary residual voltage clamp circuit, voltage will be clamped at below rear end equipment safe voltage scope.D4, T1, D3 and D6, T1, D1 have played differential mode (between line) protective effect, and D4, T1, D2 and D1, T1, D5 have played the common mode protective effect to grid line 1, and D6, T1, D2 and D3, T1, D5 have played the common mode protective effect to grid line 2.Form the junction capacitance that can reduce single discrete TVS pipe with combinational circuit by fast recovery diode and TVS pipe, due to the junction capacitance of fast recovery diode than little many of TVS, the junction capacitance of combinational circuit depends mainly on fast recovery diode, the reaction speed of fast recovery diode is faster than TVS, therefore can not affect the clamping action of TVS.
The principle of other three groups of protective circuits is identical with first group with structure, is connecting second group of protective circuit between the pin 3,6 of J1, J2, is connecting the 3rd group of protective circuit between pin 4,5, is connecting the 4th group of protective circuit between pin 7,8.
Play a reversed role on the impact of data-signal in order to prevent external large ground voltage; four groups of protective circuits are before external the earth; the glass gas-discharge pipe G9 ground connection of connecting; when its both end voltage during lower than discharge voltage; be in open-circuit condition (〉 100 megohms); the problem of disturbing so can not occur playing a reversed role; when glass gas-discharge pipe G9 is subject to the transient state high energy impact events; it can be to become Low ESR with the high impedance of its two interpolar in 1ns; with the surge current external the earth of releasing, thereby realized the effect of earial drainage.So the glass gas-discharge pipe has solved the earth problem of playing a reversed role well.
The above is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (5)
1. Giga network thunder proof device with the POE function; it is characterized in that; comprise two RJ45 seat J1 and J2 being located at respectively network input and output, be connected in parallel on four groups of protective circuits between J1 and J2, every group of protective circuit comprises one-level thunder and lightning leadage circuit and the secondary residual voltage clamp circuit that connects successively.
2. the Giga network thunder proof device with the POE function as claimed in claim 1, it is characterized in that, described one-level thunder and lightning leadage circuit comprises two ceramic gas discharge tubes and two resistance, wherein the input of ceramic gas discharge tube connects respectively two pins of J1, output termination the earth, resistance is connected on respectively on two grid lines.
3. the Giga network thunder proof device with the POE function as claimed in claim 1, it is characterized in that, described secondary residual voltage clamp circuit comprises six fast recovery diodes and a Transient Suppression Diode, wherein six fast recovery diodes are divided into two groups, every group comprises three fast recovery diodes, every group of fast recovery diode one end is connected, and the other end is connected with two pins and the earth of J2 respectively, and Transient Suppression Diode is connected between the link of every group of fast recovery diode.
4. as claim 2 and 3 described Giga network thunder proof devices with the POE function, it is characterized in that, described four groups of one-level thunder and lightning leadage circuits and secondary residual voltage clamp circuit series connection one glass gas-discharge pipe connect the earth.
5. the Giga network thunder proof device with the POE function as claimed in claim 1, is characterized in that, the pin 1,2 of described J1, J2 connects positive source, and the pin 3,6 of J1, J2 connects the negative pole of power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320189408 CN203261022U (en) | 2013-04-16 | 2013-04-16 | Gigabit-network lightning protection device with POE function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320189408 CN203261022U (en) | 2013-04-16 | 2013-04-16 | Gigabit-network lightning protection device with POE function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203261022U true CN203261022U (en) | 2013-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320189408 Expired - Fee Related CN203261022U (en) | 2013-04-16 | 2013-04-16 | Gigabit-network lightning protection device with POE function |
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| Country | Link |
|---|---|
| CN (1) | CN203261022U (en) |
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2013
- 2013-04-16 CN CN 201320189408 patent/CN203261022U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131030 Termination date: 20180416 |
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| CF01 | Termination of patent right due to non-payment of annual fee |