CN100470992C - Thunder proof protective circuit for Ethernet interface - Google Patents
Thunder proof protective circuit for Ethernet interface Download PDFInfo
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- CN100470992C CN100470992C CNB031592554A CN03159255A CN100470992C CN 100470992 C CN100470992 C CN 100470992C CN B031592554 A CNB031592554 A CN B031592554A CN 03159255 A CN03159255 A CN 03159255A CN 100470992 C CN100470992 C CN 100470992C
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Abstract
The present invention relates to an Ethernet interface lightning protection circuit which can be used in the communication equipment, and is characterized by that its every input side port is equipped with first-stage protection circuit formed from gas discharge tube, and its every device side port is equipped with second-stage protection circuit mainly formed from silicon protection diode, the operating voltage of the described first-stage protection circuit is higher than that of described second-stage protection circuit, and between every device side port and correspondent input side port a current-limiter device with decoupling action is series-connected. In the second-stage protection circuit the silicon protection diode and fast-recovering diode series connection can be adopted, and in the firsl-stage protection circuit the two-pole or three-pole gas discharge tube can be adopted to implement overvoltage protection.
Description
Technical field
The present invention relates to the lightning-protection engineering of communication equipment, more particularly, relate to a kind of lightning protection circuit that is used for communication equipment Ethernet interface place.
Background technology
Along with popularizing of network technology, the application of 10/100BASE Ethernet interface has also more and more widely become a kind of Ethernet interface the most frequently used in the present network.In actual use, Ethernet cable is crisscross and by the indoor open air that extends to, so the electromagnetic pulse that is caused by thunder and lightning can be responded to temporary overvoltage in ethernet line.Simultaneously, add that the dielectric strength at Ethernet interface place in the communication equipment is generally lower, tolerance overvoltage and overcurrent capability are relatively poor, are easy to be subjected to the infringement of temporary overvoltage.In order to guarantee the safe and reliable operation of communication equipment, must take the overvoltage protection measure to Ethernet interface.
Technical scheme commonly used in the prior art has following two kinds:
First kind: be to adopt one-level silicon protective circuit to carry out differential mode, common mode overvoltage protection at the Ethernet interface place of communication equipment.Its shortcoming is that the impact discharge capacity (being the maximum overcurrent that protective circuit can bear and can not cause damaging) of tolerance thunder and lightning is lower; if but adopt the bigger silicon protective circuit of discharge capacity; it is very big that its junction capacitance will become, thereby influence the transmission quality of ethernet signal.
Second kind: be to adopt the one-level gas discharge tube to carry out differential mode, common mode overvoltage protection at the Ethernet interface place of communication equipment.Its shortcoming is that the gas discharge tube response time is slow, and the residual voltage ratio that produces when action is higher, can not protect the sensitive circuit of back reliably.
Summary of the invention
The invention provides a kind of lightning protection circuit of Ethernet interface, relatively poor and can influence the problem of signal transmission quality with the protection effect that solves existing Ethernet interface lightning protection circuit.
For solving the problems of the technologies described above, the invention provides following technical scheme:
A kind of Ethernet interface lightning protection circuit, wherein be provided with and be used for the positive and negative transmit port of input side and the positive and negative receiving port of input side that are connected with the input side of Ethernet interface, also be provided with and be used for the positive and negative transmit port of device-side and the positive and negative receiving port of device-side that are connected with the device-side of Ethernet interface; At least be provided with dual-electrode protecting circuit between each input side port and corresponding devices side ports, wherein, first order protective circuit is located at described each input side port, and second level protective circuit is located at described device-side port; The operation voltage of described first order protective circuit is higher than the operation voltage of second level protective circuit.By the duplicate protection of above-mentioned first order protective circuit and second level protective circuit, differential mode and common mode protection have been realized to Ethernet interface; Also reduced the capacitance that is connected across the holding wire two ends simultaneously, thereby can not impact signal transmission quality farthest.
Among the present invention, also can between described first order protective circuit and second level protective circuit, be in series with current limiting device.Described current limiting device can be resistance, inductance, the resistor group that is in series by at least two resistance or the inductive bank that is in series by at least two inductance.
In the protective circuit of the described second level of the present invention, can adopt to be connected after four silicon protection diodes and the fast recovery diode series connection between the positive and negative port of device-side, also can adopt four silicon protection diodes to be connected between device-side port and the ground to realize the common mode overvoltage protection to realize the differential mode overvoltage protection; In order to reduce the influence that junction capacitance produced of silicon protection diode, also can protect fast recovery diode of diode branch series connection, or per two silicon protection diode anode is connected back-to-back at each silicon.
Can adopt two three utmost point gas discharge tubes or six the two poles of the earth gas discharge tubes to realize common mode and differential mode overvoltage protection in the described first order protective circuit of the present invention, the discharge voltage of wherein said gas discharge tube is greater than the puncture voltage of described silicon protection diode.
Among the present invention, when the temporary overvoltage ripple of introducing by input side when signal line is transferred to protective circuit because gas discharge tube has higher discharge voltage and long response time, its not discharge of conducting immediately; Before the gas discharge tube conducting, silicon protection diode will be at first breakdown, and flow through transient current; Along with the increase of transient current, the pressure drop on the current limiting device also correspondingly increases, and this pressure drop puts on the gas discharge tube two ends, just impels it to move discharge as early as possible.Behind the gas discharge tube discharge, the passage that it will provide the bypass of a ground connection to release the big electric current of transient state also can play over-voltage simultaneously, and current limiting device and silicon protection diode are played a protective role.
As seen; the present invention adopts silicon protective circuit and gas discharge tube protective circuit simultaneously; the protection effect that has solved existing Ethernet interface lightning protection circuit is relatively poor, can influence problem such as signal transmission quality, can prevent the damage that the transient state differential mode that causes owing to lightning induction and common mode overvoltage, overcurrent cause the ethernet signal interface effectively.Under the prerequisite that does not influence signal transmission quality; lightning protection circuit of the present invention makes Ethernet interface can bear lightning impulse current up to 3KA (8/20us waveform); strengthen the ability of the anti-thunderbolt of Ethernet interface greatly, reduced the thunderbolt spoilage of Ethernet interface.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the lightning protection circuit figure in a preferred embodiment of the invention;
Fig. 2 is the lightning protection circuit figure in another embodiment of the present invention;
Fig. 3 is the circuit diagram that has increased in lightning protection circuit shown in Figure 1 behind the silicon protection diode of common mode overvoltage protection effect;
Fig. 4 changes three utmost point gas discharge tubes in the lightning protection circuit shown in Figure 1 into behind the gas discharge tube of the two poles of the earth circuit diagram;
Fig. 5 increases the inductance circuit diagram afterwards of connecting with resistance in Fig. 4;
Fig. 6 is a circuit diagram after the increase third level protective circuit in lightning protection circuit shown in Figure 1.
Embodiment
Embodiments of the invention one as shown in Figure 1, right side among the figure is the input side of Ethernet interface, and what adopt in the present embodiment is the RJ45 joint, and has used its four joints, be positive and negative transmission Signal connector TX+, TX-, positive and negative received signal joint RX+, RX-.Left side among the figure is the device-side of Ethernet interface, is lightning protection circuit in the middle frame of broken lines.
As can be seen from the figure; this lightning protection circuit is by two three utmost point gas discharge tube G1, G2; four resistance R 1, R2, R3, R4, four silicon protection diode VD1, VD2, VD3, VD4, and four dual-electrode protecting circuit that fast recovery diode D1, D2, D3, D4 form.Wherein, the discharge voltage of three utmost point gas discharge tube G1, G2 is greater than the puncture voltage of silicon protection diode VD1, VD2, VD3, VD4.
Silicon protection diode in foregoing circuit can be Transient Suppression Diodes such as TVS, TSS, and they and fast recovery diode are formed second level protective circuit, are used to suppress the differential mode overvoltage, to protect the device on its left side; Three utmost point gas discharge tubes are then formed first order protective circuit, are used for the bypass big electric current of transient state of releasing, and can suppress the common mode overvoltage, can suppress the differential mode overvoltage again; Resistance R 1, R2, R3, R4 between second level protective circuit and first order protective circuit is used to limit the transient current that flows through each silicon protection diode, can improve the operating characteristics of gas discharge tube simultaneously and promote the characteristic between the dual-electrode protecting circuit to cooperate.
Implement after the present invention, when the temporary overvoltage ripple when wherein one or more signal line is transferred to protective circuit because gas discharge tube G1, G2 have higher discharge voltage and long response time, its not discharge of conducting immediately; Before the gas discharge tube conducting, silicon protection diode VD1, VD2, VD3 or VD4 will be at first breakdown, and flow through transient current; Along with the increase of transient current, the pressure drop on current-limiting resistance R1, R2, R3 or the R4 also correspondingly increases, and this pressure drop puts on the gas discharge tube two ends, just impels it to move discharge as early as possible.After gas discharge tube G1 or G2 discharge, the passage that it will provide the bypass of a ground connection to release the big electric current of transient state also can play over-voltage simultaneously, and the current-limiting resistance and the silicon protection diode in its left side played a protective role.
Because the transmission rate of 100M Ethernet interface is than higher; and the bigger silicon of existing through-current capacity protects the junction capacitance of diode also relatively big; directly be used in the protective circuit and can influence signal transfer quality; so adopt fast recovery diode D1, D2, D3, D4 to connect with it in the present embodiment; can reduce the capacitance that is connected across between the positive and negative holding wire largely like this, thereby reach the purpose that does not influence signal transmission quality.
The present invention is not limited to the foregoing description, and following multiple embodiment also can be arranged:
1, series connection recovery diode more how soon on each silicon protection diode branch; for example the fast recovery diode D1 among Fig. 1 is changed into the fast recovery diode of three series connection; D2, D3, D4 change accordingly simultaneously; can further reduce the capacitance between the positive and negative holding wire like this, improve signal transmission quality.
2, as shown in Figure 2; after the anode of two silicon protection diodes connected back-to-back, receive between the positive and negative holding wire, the electric capacity of protecting two utmost points this moment because of two silicon is for connecting mutually again; can reduce the capacitance between the positive and negative holding wire equally, so do not need to be connected in series again fast recovery diode.
3, on the basis of the foregoing description one or the 1st, the 2nd kind of execution mode, in the protective circuit of the second level, increase silicon protection diode over the ground.Be the circuit diagram that in the lightning protection circuit of Fig. 1, increases after silicon is protected diode as shown in Figure 3,, can play the effect of common mode overvoltage protection by between each device-side port and ground, connecing a silicon protection diode.
4, two three utmost point gas discharge tubes in the foregoing description one or the 1st, the 2nd, the 3rd kind of execution mode are changed into adopt a plurality of the two poles of the earth gas discharge tube.Be illustrated in figure 4 as the circuit diagram after three utmost point gas discharge tubes with lightning protection circuit among Fig. 1 change the two poles of the earth gas discharge tube into, six the two poles of the earth gas discharge diodes are wherein arranged.One is connected between the positive and negative transmit port of input side, and another is connected between the positive and negative receiving port of input side, is used to realize the differential mode overvoltage protection; Four are connected on respectively between each input side port and the ground in addition, are used to realize the common mode overvoltage protection.
5, change the resistance R in the foregoing description one or the 1st, the 2nd, the 3rd, the 4th kind of execution mode into inductance, or change resistance and inductance series system into.Be illustrated in figure 5 as the circuit diagram after the resistance R among Fig. 4 changed into resistance and inductance is connected.
6,, increase the third level or more multistage protective circuit based on above-mentioned any execution mode.Circuit diagram after being illustrated in figure 6 as when in the lightning protection circuit of Fig. 1, increasing third level protective circuit; wherein increased by four fast recovery diode D5, D6, D7, D8 and four silicon and protected diode VD5, VD6, VD7, VD8, wherein the puncture voltage of silicon protection diode VD5, VD6, VD7, VD8 is lower than the puncture voltage of silicon protection diode VD1, VD2, VD3, VD4.The effect of this connection is the residual voltage by protective circuit output can be even lower, and makes the Sensitive Apparatus of back obtain more effective protection.
Above-mentioned lightning protection circuit of the present invention can directly design the Ethernet interface place at communication equipment, also can be designed as the external lightning protection device, connects during use before Ethernet interface, can play the lightning protection effect equally.
Claims (6)
1, a kind of Ethernet interface lightning protection circuit; wherein be provided with and be used for the positive and negative transmit port of input side and the positive and negative receiving port of input side that are connected with the input side of Ethernet interface; also be provided with and be used for the positive and negative transmit port of device-side and the positive and negative receiving port of device-side that are connected with the device-side of Ethernet interface; it is characterized in that
At least be provided with dual-electrode protecting circuit between each input side port and corresponding devices side ports, wherein, first order protective circuit is located at described each input side port, and second level protective circuit is located at described each device-side port; The operation voltage of described first order protective circuit is higher than the operation voltage of second level protective circuit;
Described first order protective circuit is made up of gas discharge tube; Described second level protective circuit mainly is made up of silicon protection diode and fast recovery diode; The discharge voltage of described gas discharge tube is greater than the puncture voltage of described silicon protection diode;
Comprise four silicon protection diode and four fast recovery diodes that are used to realize the differential mode overvoltage protection in the protective circuit of the described second level, wherein be connected between positive and negative transmit port of described device-side and the positive and negative receiving port of described device-side after each silicon protection diode and each the fast recovery diode differential concatenation.
2, lightning protection circuit according to claim 1 is characterized in that, comprises four silicon protection diodes that are used to realize the differential mode overvoltage protection in the protective circuit of the described second level; Wherein the negative transmit port of the described device-side of positive termination, the negative terminal of first silicon protection diode connect the positive transmit port of described device-side, and the positive transmit port of the described device-side of positive termination, the negative terminal of second silicon protection diode connects the negative transmit port of described device-side; Two silicon protection diodes are connected between the positive and negative receiving port of described device-side by the same manner in addition.
3, lightning protection circuit according to claim 2 is characterized in that, also is in series with one or more fast recovery diodes on each the silicon protection diode branch in the protective circuit of the described second level.
4, lightning protection circuit according to claim 1 is characterized in that, also is in series with current limiting device between described first order protective circuit and second level protective circuit.
5, lightning protection circuit according to claim 4 is characterized in that, described current limiting device is resistance or inductance or resistor group that is in series by at least two resistance or the inductive bank that is in series by at least two inductance.
6, a kind of Ethernet interface lightning protection circuit; wherein be provided with and be used for the positive and negative transmit port of input side and the positive and negative receiving port of input side that are connected with the input side of Ethernet interface; also be provided with and be used for the positive and negative transmit port of device-side and the positive and negative receiving port of device-side that are connected with the device-side of Ethernet interface; it is characterized in that
At least be provided with dual-electrode protecting circuit between each input side port and corresponding devices side ports, wherein, first order protective circuit is located at described each input side port, and second level protective circuit is located at described each device-side port; The operation voltage of described first order protective circuit is higher than the operation voltage of second level protective circuit;
Described first order protective circuit is made up of gas discharge tube; Described second level protective circuit mainly is made up of silicon protection diode; The discharge voltage of described gas discharge tube is greater than the puncture voltage of described silicon protection diode;
Comprise four silicon protection diodes that are used to realize the differential mode overvoltage protection in the protective circuit of the described second level; Wherein the anode of two silicon protection diodes connects back-to-back, and negative terminal connects the positive and negative transmit port of described device-side respectively; The anode of two silicon protection diodes connects back-to-back in addition, and negative terminal connects the positive and negative receiving port of described device-side respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031592554A CN100470992C (en) | 2003-05-10 | 2003-09-12 | Thunder proof protective circuit for Ethernet interface |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03128780 | 2003-05-10 | ||
| CN03128780.8 | 2003-05-10 | ||
| CNB031592554A CN100470992C (en) | 2003-05-10 | 2003-09-12 | Thunder proof protective circuit for Ethernet interface |
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| Publication Number | Publication Date |
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| CN1549416A CN1549416A (en) | 2004-11-24 |
| CN100470992C true CN100470992C (en) | 2009-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031592554A Expired - Fee Related CN100470992C (en) | 2003-05-10 | 2003-09-12 | Thunder proof protective circuit for Ethernet interface |
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| CN (1) | CN100470992C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2672656A4 (en) * | 2011-04-11 | 2015-03-04 | Huawei Tech Co Ltd | Power over ethernet port protection circuit and ethernet power supply equipment |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100561820C (en) * | 2006-11-07 | 2009-11-18 | 深圳市威尔利实业有限公司 | Decoupling anti-lightning circuit and lightning protection connecting terminal |
| CN101488666B (en) * | 2008-01-18 | 2010-12-08 | 研祥智能科技股份有限公司 | Network port lightning preventing circuit and RJ45 interface apparatus thereof |
| TWI376130B (en) | 2008-12-10 | 2012-11-01 | Unihan Corp | Preventing surge circuit, local area network connector and network module |
| CN101752853B (en) * | 2008-12-10 | 2012-12-19 | 永硕联合国际股份有限公司 | Surge protection circuit, local area network connector and network module |
| CN102110980B (en) * | 2011-02-23 | 2014-06-04 | 华为机器有限公司 | Lightning protection circuit |
| CN102324739B (en) * | 2011-09-29 | 2014-08-27 | 株洲普天中普防雷科技有限公司 | Lightning strike and surge prevention method for power over Ethernet and thunder preventer |
| CN103259255B (en) * | 2012-02-20 | 2016-03-30 | 联想(北京)有限公司 | A kind of lightning protection circuit of network interface |
| 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 |
| 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 |
| CN102957137B (en) * | 2012-11-12 | 2016-04-20 | 上海斐讯数据通信技术有限公司 | Ethernet overcurrent-overvoltage protector |
| 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 |
| CN105319491B (en) * | 2015-10-16 | 2018-08-14 | 深圳市科威泰斯科技有限公司 | Transient overvoltage test circuit and transient overvoltage test equipment |
| CN105470937A (en) * | 2015-12-10 | 2016-04-06 | 中国海洋石油总公司 | Signal lightning protection circuit for top drive frequency converter |
| CN109473962A (en) * | 2018-12-13 | 2019-03-15 | 深圳市共进电子股份有限公司 | Network interface protection circuit and the network equipment |
| CN112910484B (en) * | 2021-01-21 | 2023-02-28 | 睿高(广州)通信技术有限公司 | Lightning protection system for communication port of airborne power amplifier equipment |
-
2003
- 2003-09-12 CN CNB031592554A patent/CN100470992C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2672656A4 (en) * | 2011-04-11 | 2015-03-04 | Huawei Tech Co Ltd | Power over ethernet port protection circuit and ethernet power supply equipment |
| US9472950B2 (en) | 2011-04-11 | 2016-10-18 | Huawei Technologies Co., Ltd. | Protection circuit of power over ethernet port and ethernet power-sourcing equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1549416A (en) | 2004-11-24 |
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