CN102185303A - Prevention circuit capable of supporting withstand voltage and surge of port simultaneously - Google Patents
Prevention circuit capable of supporting withstand voltage and surge of port simultaneously Download PDFInfo
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- CN102185303A CN102185303A CN2011101165474A CN201110116547A CN102185303A CN 102185303 A CN102185303 A CN 102185303A CN 2011101165474 A CN2011101165474 A CN 2011101165474A CN 201110116547 A CN201110116547 A CN 201110116547A CN 102185303 A CN102185303 A CN 102185303A
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Abstract
The invention discloses a prevention circuit capable of supporting withstand voltage and surge of a port simultaneously, comprising a network transformer T1A and an RJ45 port in connection, wherein a voltage dependent resistor RV1 and a gas-discharge tube G1 are connected in series between a primary center tap of the network transformer T1A and an earth terminal; a high-voltage capacitor C3 is connected in parallel between the primary center tap of the network transformer T1A and the earth terminal; a high-voltage capacitor C2 is connected between a secondary winding center tap of the network transformer T1A and the earth terminal; and unused pins B4 and pin B5 as well as a pin B7 and a pin B8 of the RJ45 port are connected to the primary center tap of the network transformer T1A by magnetic beads FB2 and FB3 respectively. By using the prevention circuit, a port of a communication device can support surge prevention above 4KV and withstand voltage above 500V simultaneously.
Description
Technical field
The invention belongs to the power communication field, be specifically related to the method for supporting that simultaneously network interface is withstand voltage and the network interface surge protects.
Background technology
Power industry is an industry that involves the interests of the state and the people, so its requirement to the reliability of communication apparatus is very harsh.Power communication equipment generally is used for whole electrical network is monitored and communication, owing to often come into contacts with high pressure, for specific application scenarios, the network interface that the electric power standard has proposed communication apparatus need satisfy surge and withstand voltage requirement.The method of surge protection is the energy efficient of thunderbolt to be dredged release, and withstand voltage method to be requirement equipment can stop the conducting of high pressure to form electric current, one is that to lead one be resistance, these two kinds of protection were exactly a paradox originally.In numerous power communication equipment development producer, everybody realizes surge by the port lightning preventing device is installed, came withstand voltagely by laying down the port lightning preventing device, under the situation of equipment not being made amendment, can't satisfy the network interface surge and the withstand voltage protection requirements of electric power simultaneously.
Summary of the invention
Technical problem to be solved by this invention is: under the prerequisite of not changing the equipment physical attribute, provide a kind of protection circuit of supporting the withstand voltage and network interface surge of network interface simultaneously.
The technical solution adopted in the present invention is: a kind of protection circuit of supporting the withstand voltage and network interface surge of network interface simultaneously, comprise continuous network transformer T1A and RJ45 port, be connected to the piezo-resistance RV1 and the gas discharge tube G1 of polyphone between the main centre cap of network transformer T1A and the earth terminal, high-voltage capacitors connected in parallel C3 between described main centre cap and the earth terminal, be connected to high-voltage capacitance C2 between the secondary winding centre cap of network transformer T1A and the earth terminal, the not use pin B4 of RJ45 port, B5 and B7, B8 is connected to the main centre cap of network transformer T1A respectively by magnetic bead FB2 and FB3.
Further, also be connected to TVS die U9 between network transformer T1A and the RJ45 port.
Further, the model of network transformer T1A is HS40-164.
Further, the model of RJ45 port is XS2B.
Further, piezo-resistance RV1 adopts 471kd20J.
Further, the model of gas discharge tube G1 is 40s600.
Further, the parameter of high-voltage capacitance C2, C3 is 1000pF/2KV.
Further, the parameter of magnetic bead FB2, FB3 is 600ohm/100MHz.
Further, the model of TVS die U9 is SLVU2.8-4.T.
The present invention mainly contains following advantage:
Surge protection and the above withstand voltage protection of 500V that one, the present invention can make the network interface of communication apparatus support that simultaneously 4KV is above.
Two, the present invention has simplified three grades of redundant surge lightning protection circuits, has reduced the cost of surge protection significantly.Three grades of lightning protection circuits need all to go here and there on each circuit a gas discharge tube and a decoupling resistor/inductance, the data wire of each FE electricity mouth has four, so just need 4 gas discharge tubes and 4 decoupling resistor/inductance, and the present invention only needs a gas discharge tube to add pressure-sensitive resistance, just can finish surge protection, and can the shared gas discharge tube of a plurality of FE mouths add pressure-sensitive resistance and realize the surge protection.
Three, the present invention can regulate by device and can make the withstand voltage AC of the reaching 1500V of network interface, so more in communication apparatus the high-voltage transforming control station/ safety operating.
Four, the present invention can the traffic affecting normal communication under the situation that protective device lost efficacy yet.
Five, the present invention can make the protection of network interface surge satisfy the strictest rank of GBT 17626.5 fully, and the present invention can make the withstand voltage protection of network interface satisfy Q/EPRI 040-2010 standard fully.
In a word, this significantly reduces surge protection cost, and the protection of withstand voltage protection and surge is taken into account.The present invention has wide application scenarios in the surge of speech interface, AC (interchange) power interface, DC (direct current) power interface, FE (Fast Ethernet) electricity mouthful, GE (good omen Ethernet) electricity mouthful, RS485 interface and other industrial communication external interface and withstand voltage protection.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
In order to realize goal of the invention, the present invention makes full use of the isolation and the withstand voltage function of network transformer, and orderly connection in series-parallel is connected and realizes withstand voltage and satisfied the surge protection time with transformer by piezo-resistance, gas discharge tube, TVS (Transient Voltage Suppressor) pipe then.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
Core concept of the present invention is: by the withstand voltage and isolation between the input and output weak point of network transformer, the cut-in voltage characteristic of adding gas discharge tube and piezo-resistance designs, and designs and can satisfy withstand voltage simultaneously and protection circuit surge.
Protection circuit of the present invention is by orderly connection in series-parallel is connected and realizes with transformer with technology maturation, widely used piezo-resistance, gas discharge tube, TVS pipe, thereby realizes that simultaneously the above network interface of network interface surge that 4KV is above and 500V is withstand voltage.
Fig. 1 is circuit theory diagrams of the present invention, wherein XS2B is the RJ45 network interface of metal interface, U9 is the chip of integrated 4 road TVS pipes, T1A is a port of 100M network transformer, C2 and C3 be withstand voltage for 2KV appearance value be the high-voltage capacitance of 1000PF, FB2 and FB3 are that the 600ohm/100MHz through-current capacity is the magnetic bead of 3A, RV1 is that cut-in voltage is that 470V and through-current capacity are the piezo-resistance of 20KA, G1 is that cut-in voltage is the gas discharge tube of 600V and through-current capacity 1KA, and GND_EARTH1 is the metal location hole of shell the earth of meeting sb. at the airport.
During concrete the connection, pin B1, the B2 of XS2B, B3, B6 are connected to the pin 8,7,6,5 of chip U9 respectively.The pin BLA of XS2B is connected to the LED port of 3.3V, and pin BLC is connected to the P3_ACT LED port of Fast Ethernet, and pin BRA is connected to 3.3V LED port, and pin BRC is connected to P3_LINK LED port.Pin B4, the B5 of XS2B is connected to the end of piezo-resistance RV1 by magnetic bead FB2, and pin B7, B8 are connected to the end of piezo-resistance RV1 by magnetic bead FB3, and the other end of piezo-resistance RV1 is by gas discharge tube G1 ground connection.The pin 1,2,3,4 of chip U9 is connected to the pin 40,39,37,36 of network transformer T1A respectively.The pin 38 of T1A is connected to gas discharge tube G1 by piezo-resistance RV1.The pin 3 of T1A is by capacitor C 2 ground connection.The pin 38 of T1A and earth terminal shunt capacitance C3.
The pin 1,8,2,7,3,6,4,5 of chip U9 also is connected together respectively.Also by magnetic bead FB1 and high-voltage capacitance C1 ground connection, the centre tapped other end of the secondary winding of network transformer T1A is connected to external power supply VCC to the secondary winding centre cap pin 3 of network transformer T1A.The pin 1,2,4,5 of T1A is connected to P3_RXP, P3_RXN, P3_TXP, the P3_TXN port of Ethernet respectively.
The implementation of the withstand voltage protection of network interface is as described below, in the design's circuit, adopt the series connection of piezo-resistance and gas discharge tube, be connected in series to then between transformer T1A side centre cap and the earth (GND_EARTH), in parallel with the tap 2KV high-voltage capacitance C3 of transformer T1A side again, when the AC withstand voltage of piezo-resistance and gas discharge tube Equivalent A C withstand voltage were added up greater than NV, it is withstand voltage that network interface just can be crossed NV.Withstand voltage test is four data lines of FE mouth and to a bit, the alternating current that to add a frequency then between this point and the earth be 50Hz specific voltage value, and when electric current during less than 10mA, withstand voltage protection is with regard to compliant.When between these 2, adding the alternating current of a 500V, because the input and output of transformer are isolated, isolation is 1500V, 500V voltage on the circuit can not pass transformer, also can not pass through C3, because the withstand voltage of C3 is 2KV, and the total withstand voltage 500V of being higher than of G1 that the present invention uses and RV1, so the design can do the withstand voltage protection of 500V.
The implementation of network interface surge protection is as described below, after the short time of surge, the large impact energy entered RJ45, carry out small part energy absorption and line voltage distribution clamper by TVS pipe (TVS die) earlier, then energy passes to the centre cap of T1A side by signal line, when the energy of tap is accumulated certain voltage, will puncture piezo-resistance and gas discharge tube and carry out energy and release, when energy release finish after gas discharge tube and piezo-resistance recover normal high-impedance state.Can remove TVS pipe (TVS die) as the surge that did not need differential mode 4KV.Surge test is divided into differential mode and common mode, and the electric power standard only has requirement to common mode; Common mode 4KV surge is four data lines (1 FE, 2,3,6) and in a bit, between this point and the earth, add the voltage wave of a 8/20us 4KV then, when common mode surge after high-pressure energy enters into XS2B RJ45 in short-term, energy can arrive the PIN38 (centre cap) of T1A rapidly, reach the pressure value of 1000V at the two ends of very short time RV1 and G1, then RV1 and G1 conducting, the high voltage surge energy of releasing; Differential mode 4KV surge, the present invention also can satisfy.
The present invention can satisfy network interface surge and the withstand voltage protection of network interface simultaneously, as long as designed eigen in PCB and the principle diagram design, no matter whether weld related device, all is applicable to the present invention.
Claims (9)
1. protection circuit of supporting the withstand voltage and network interface surge of network interface simultaneously, comprise continuous network transformer T1A and RJ45 port, it is characterized in that: the piezo-resistance RV1 and the gas discharge tube G1 that are connected to polyphone between the main centre cap of network transformer T1A and the earth terminal, high-voltage capacitors connected in parallel C3 between described main centre cap and the earth terminal, be connected to high-voltage capacitance C2 between the secondary winding centre cap of network transformer T1A and the earth terminal, the not use pin B4 of RJ45 port, B5 and B7, B8 is connected to the main centre cap of network transformer T1A respectively by magnetic bead FB2 and FB3.
2. circuit according to claim 1 is characterized in that: also be connected to TVS die U9 between network transformer T1A and the RJ45 port.
3. circuit according to claim 1 and 2 is characterized in that: the model of network transformer T1A is HS40-164.
4. circuit according to claim 1 and 2 is characterized in that: the model of RJ45 port is XS2B.
5. circuit according to claim 1 and 2 is characterized in that: piezo-resistance RV1 adopts 471kd20J.
6. circuit according to claim 1 and 2 is characterized in that: the model of gas discharge tube G1 is 40s600.
7. circuit according to claim 1 and 2 is characterized in that: the parameter of high-voltage capacitance C2, C3 is 1000pF/2KV.
8. circuit according to claim 1 and 2 is characterized in that: the parameter of magnetic bead FB2, FB3 is 600ohm/100MHz.
9. circuit according to claim 2 is characterized in that: the model of TVS die U9 is SLVU2.8-4.T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101165474A CN102185303A (en) | 2011-05-06 | 2011-05-06 | Prevention circuit capable of supporting withstand voltage and surge of port simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101165474A CN102185303A (en) | 2011-05-06 | 2011-05-06 | Prevention circuit capable of supporting withstand voltage and surge of port simultaneously |
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| CN102185303A true CN102185303A (en) | 2011-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101165474A Pending CN102185303A (en) | 2011-05-06 | 2011-05-06 | Prevention circuit capable of supporting withstand voltage and surge of port simultaneously |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692934A (en) * | 2011-10-26 | 2012-09-26 | 上海广诚信息技术有限公司 | Temperature control and protection system of network equipment in industrial environment |
| 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 |
| CN109672157A (en) * | 2018-12-21 | 2019-04-23 | 国网河南省电力公司焦作供电公司 | Communication port surge protection circuit |
| WO2020192329A1 (en) * | 2019-03-22 | 2020-10-01 | 太仓市同维电子有限公司 | Adjustment method for home gateway type communication terminal failing to pass conduction interference test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201041880Y (en) * | 2007-05-15 | 2008-03-26 | 江苏华丽网络工程有限公司 | Electric connection structure for multi-function RJ45 connector |
| CN201278411Y (en) * | 2008-08-13 | 2009-07-22 | 中兴通讯股份有限公司 | Ethernet connector with lightning protection function |
| US20110026178A1 (en) * | 2008-03-17 | 2011-02-03 | Huawei Technologies Co., Ltd. | Interface circuit and communication device |
-
2011
- 2011-05-06 CN CN2011101165474A patent/CN102185303A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201041880Y (en) * | 2007-05-15 | 2008-03-26 | 江苏华丽网络工程有限公司 | Electric connection structure for multi-function RJ45 connector |
| US20110026178A1 (en) * | 2008-03-17 | 2011-02-03 | Huawei Technologies Co., Ltd. | Interface circuit and communication device |
| CN201278411Y (en) * | 2008-08-13 | 2009-07-22 | 中兴通讯股份有限公司 | Ethernet connector with lightning protection function |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692934A (en) * | 2011-10-26 | 2012-09-26 | 上海广诚信息技术有限公司 | Temperature control and protection system of network equipment in industrial environment |
| 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 |
| CN109672157A (en) * | 2018-12-21 | 2019-04-23 | 国网河南省电力公司焦作供电公司 | Communication port surge protection circuit |
| WO2020192329A1 (en) * | 2019-03-22 | 2020-10-01 | 太仓市同维电子有限公司 | Adjustment method for home gateway type communication terminal failing to pass conduction interference test |
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Application publication date: 20110914 |