CN205231725U - Network interface circuit - Google Patents
Network interface circuit Download PDFInfo
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- CN205231725U CN205231725U CN201521019451.6U CN201521019451U CN205231725U CN 205231725 U CN205231725 U CN 205231725U CN 201521019451 U CN201521019451 U CN 201521019451U CN 205231725 U CN205231725 U CN 205231725U
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- signal line
- network interface
- coupling module
- protection device
- interface circuit
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- 230000001629 suppression Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 9
- 230000001012 protector Effects 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
The utility model discloses a network interface circuit, including ethernet interface, coupling module and network interface chip to the positive signal line and the burden of netting very much the differential signal wire pair between interface and the coupling module are connected with first order protective component between the signal line, are connected to ground through first order protective component, be connected with second level protective component between the positive signal line of the differential signal wire pair between coupling module and the network interface chip and the burden signal line. The utility model discloses can realize the protection to the lightning surge interference.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a network interface circuit.
Background
Ethernet is a lan technology widely used at present, and a gigabit ethernet interface has been widely used in various types of communication products. For example, in the field of security monitoring systems, the interface is applied to devices such as intelligent traffic cameras and network cameras, and the network transmission lines connected with the Ethernet interfaces of the devices usually have the characteristics of long transmission distance, mostly outdoor wiring, open field and the like, so that the network transmission lines are easily interfered by lightning surge signals, and the performance of the devices is further influenced.
The lightning surge interference mode is generally divided into a common mode surge and a differential mode surge, the common mode surge is a high potential difference between a signal line and the ground caused when equipment is interfered, and the differential mode surge is a high potential difference between any signal line and the signal line caused when the equipment is interfered by lightning. By performing lightning protection on the Ethernet interface of the equipment, the equipment can be prevented from being damaged and normal work can be guaranteed when the equipment is interfered by the common-mode surge and the differential-mode surge of the lightning surge, so that the performance of the equipment is greatly improved, and the use experience of a user is improved.
Therefore, how to protect against lightning surge interference is a problem to be researched and solved urgently in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model provides a network interface circuit for the protection that the realization disturbed the surge of thunderbolt.
The utility model discloses a network interface circuit that embodiment provided, including ethernet interface, coupling module and network interface chip, the ethernet interface is connected to the network interface chip through the coupling module, is connected with first order protection device between the positive signal line and the negative signal line of the differential signal line pair between ethernet interface and the coupling module, is connected to ground through first order protection device;
and a second-stage protection device is connected between a positive signal line and a negative signal line of a differential signal line pair between the coupling module and the network interface chip.
Specifically, a first-stage protection device is connected between a positive signal line and a negative signal line of all differential signal line pairs between the Ethernet interface and the coupling module, and is connected to the ground through the first-stage protection device; or, a first-stage protection device is connected between a positive signal line and a negative signal line of a differential signal line pair for signal transmission between the ethernet interface and the coupling module, and is connected to the ground through the first-stage protection device, and each signal line in the idle differential signal line pair is connected to the protection device and is connected to the ground through the protection device.
Wherein, the protective device is a piezoresistor or a gas discharge tube.
Wherein, the first-stage protection device is a lightning protection device.
Specifically, the lightning protection device is a three-terminal gas discharge tube or a combination of two gas discharge tubes connected in series.
The second-stage protection device is a clamping device, and the clamping device connects a positive signal line and a negative signal line of each differential signal line pair between the coupling module and the network interface chip.
Specifically, the clamping device is a single transient suppression diode, or a combination of multiple transient suppression diodes connected in parallel, or a combination of a transient suppression diode and a rectifier bridge.
Preferably, a current limiting device is further connected between the coupling module and the network interface chip.
Wherein the current limiting device is a resistor.
Further, the coupling module is a network transformer or a 1:1 conversion circuit module.
The embodiment of the utility model provides a through first order protector and second level protector, can realize the differential mode and the common mode protection to the ethernet, can stand the high energy voltage impact, again can the fast response, the lightning protection, surge-proof is effectual, can effectively protect the precision components and parts in the electronic circuit, avoids surge interference's damage.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive effort.
FIG. 1 is a schematic diagram of a lightning protection circuit for an Ethernet interface in the prior art;
fig. 2 is a schematic diagram of a network interface circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a network interface circuit according to an embodiment of the present invention;
fig. 4 (a) is a schematic view of a lightning protection device according to an embodiment of the present invention;
(b) a schematic view of a lightning protection device provided in an embodiment of the present invention;
fig. 5 (a) is a schematic diagram of a clamp device according to an embodiment of the present invention;
(b) a schematic diagram of a clamp device provided for one embodiment of the present invention;
(c) a schematic diagram of a clamp device provided for one embodiment of the present invention;
fig. 6 is a schematic diagram of a network interface circuit according to an embodiment of the present invention;
Fig. 7 is a schematic diagram of a coupler according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a network interface circuit under a hundred mega ethernet network according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the prior art, two types of protection for network interface circuits are commonly used, one is to use a primary gas discharge tube at an ethernet interface for overvoltage protection, and the other is to use a primary silicon protection circuit at the ethernet interface for overvoltage protection, such as a Transient Voltage Suppressor (TVS). Fig. 1 shows a technical solution of lightning protection of an ethernet interface in the prior art.
As shown in fig. 1, a secondary protection is adopted between the ethernet interface and the transformer, wherein the primary protection is located at the ethernet interface side, and primary protection devices, which are gas discharge tubes (with the bit numbers G1 and G2 in the figure), are respectively added to the ground on the differential signal line pair for transmission and reception; the second-stage protection is positioned on the side of a transformer connected with an Ethernet interface line, and a second-stage protection device is respectively added between the generated and received differential signal line pairs, wherein the second-stage protection device is a silicon protection diode (the bit numbers of the second-stage protection device are D1 and VD1, D2 and VD2, D3 and VD3, D4 and VD 4); and a decoupling component is connected in series between the first-stage protection circuit and the second-stage protection circuit, and the decoupling component can be a resistor, an inductor or a series connection body thereof (the numbers of bits in the figure are R1, R2, R3 and R4).
It can be seen that the two-stage protection used in the prior art shown in fig. 1 is located on the side of the transformer connected to the ethernet interface line. Because the device of the secondary protection is connected with the transformer in parallel, when differential mode surge occurs between the differential signal line pair, differential mode surge current flows through the device of the secondary protection and also flows through the transformer, so that partial energy is coupled to the secondary side of the transformer, and a protection device is not arranged between the secondary side and the network chip, so that the network chip is easily damaged due to interference. In addition, in the prior art, a decoupling element is connected in series between the first-stage protection and the second-stage protection, and when an inductor or a series body of the inductor is used as the decoupling element, because a network signal is usually a high-frequency signal, the non-ideality of the inductor will affect the transmission quality of the signal. In addition, the decoupling component is connected in series between the first-stage protection and the second-stage protection in the prior art, when a resistor or a series body of the resistor is used, because the component of the first-stage protection is usually a gas discharge tube, when the surge voltage is not high, so that the gas discharge tube cannot act, differential mode surge current flows through the decoupling resistor and the second-stage protection component, and then the resistor with larger packaging power cannot be used due to space limitation of equipment, so that the resistor is easily damaged.
The device aims to overcome the defects in protective measures for network interface circuits in the prior art, better inhibits lightning surge interference and provides overvoltage and overcurrent protection for equipment. One embodiment of the present invention provides a network interface circuit, which can be applied to a hundred mega ethernet, a gigabit ethernet, and other bandwidth ethernet networks, and is not limited in the description herein. The following describes in detail a specific embodiment of a network interface circuit according to the present invention with reference to the accompanying drawings.
Fig. 2 shows a network interface circuit according to an embodiment of the present invention, which includes an ethernet interface 201, a coupling module 202, and a network interface chip 203, where the ethernet interface 201 is connected to the network interface chip 203 through the coupling module 202:
a first-stage protection device 204 is connected between a positive signal line and a negative signal line of the differential signal line pair between the Ethernet interface 201 and the coupling module 202, and is connected to the ground through the first-stage protection device 204;
a second-stage protection device 205 is connected between a positive signal line and a negative signal line of the differential signal line pair between the coupling module 202 and the network interface chip 203.
Specifically, the ethernet interface 201, the coupling module 202, and the network interface chip 203 may all be disposed on a printed circuit board; in some specific implementation scenarios, the ethernet interface 201 may be RJ45, and the network interface chip 203 may be a PHY (physical layer) chip; the ethernet interface 201, the coupling module 202, and the network interface chip 203 may be sequentially connected in series by a differential signal line pair, and the differential signal line pair may include a positive signal line and a negative signal line, and specifically, the positive signal line and the negative signal line may be a transmission data twisted pair and a reception data twisted pair, respectively.
The first-stage protection device 204 may be disposed between the ethernet interface 201 and the coupling module 202, and the first-stage protection device 204 is connected between a positive signal line and a negative signal line of all differential signal line pairs between the ethernet interface 201 and the coupling module 202, and is connected to ground through the first-stage protection device 204; or, a first-stage protection device 204 is connected between a positive signal line and a negative signal line of the differential signal line pair for signal transmission between the ethernet interface 201 and the coupling module 202, and is connected to ground through the first-stage protection device 204, and each signal line of the idle differential signal line pair is connected to a protection device and is connected to ground through the protection device. Fig. 3 shows an embodiment in which a first stage guard device 204 is connected between the positive signal line and the negative signal line of all differential signal line pairs between the ethernet interface and the coupling module, and is connected to ground through the first stage guard device 204.
The protection device can be a piezoresistor or a gas discharge tube.
Specifically, the first stage protection device 204 may be a lightning protection device.
The lightning protection device may be a three-terminal gas discharge tube (e.g., Z2 in fig. 4 (a)), or a combination of two gas discharge tubes connected in series (e.g., Z1 and Z2 in fig. 4 (b)). For the positive signal line and the negative signal line of each differential signal line pair, taking a three-terminal gas discharge tube as an example, the two poles of the three-terminal gas discharge tube are connected to the positive signal line and the negative signal line of the differential signal line pair, respectively, and the other stage (ground electrode stage) of the three-terminal gas discharge tube is connected to ground.
As shown in fig. 2, the second-stage guard device 205 may be disposed between the coupling module 202 and the network interface chip 203, and may be a clamp device that connects the positive signal line and the negative signal line of each differential signal line pair between the coupling module 202 and the network interface chip 203.
Specifically, the clamping device may be a single Transient Voltage Suppressor (TVS) (e.g., TVS1 in (a) of fig. 5), or a combination of multiple transient voltage suppressor diodes in parallel (e.g., TVS1 and TVS5 in (b) of fig. 5), or a combination of a transient voltage suppressor and a rectifier bridge (e.g., HD3 and TVS3 in (c) of fig. 5). For each differential signal line pair, taking a single TVS as an example, one pole of the TVS is connected to the positive signal line of the differential signal line pair, and the other pole is connected to the negative signal line of the differential signal line pair.
Preferably, a current limiting device is further connected between the coupling module 202 and the network interface chip 203.
One preferred current limiting device may be a resistor.
Specifically, the current limiting device may be disposed between the second stage guard device 205 and the network interface chip 203; a current limiting device may also be disposed between the second stage guard device 205 and the coupling module 202. Taking the current limiting device as an example, the second-stage protection device 205 and the network interface chip 203 may be connected in series through a resistor (e.g., the current limiting device 301 shown in fig. 3); or the second-stage protection device 205 and the coupling module 202 are connected in series through a resistor (such as the current limiting device 601 shown in fig. 6).
The network interface circuit shown in fig. 2, wherein the coupling module 202 may be a network transformer, or may also be a 1:1 conversion circuit module.
In particular, fig. 7 shows a method using a network transformer as the coupling module 202, wherein the network transformer needed to be used may correspond to the port number of the network interface chip.
In general, the network signal may be transmitted through the network interface chip, the coupling module, and the ethernet interface in sequence, and the signal is transmitted to the terminal. Taking a hundred mega ethernet as an example, the network interface circuit shown in fig. 2 can be embodied as the implementation shown in fig. 8.
Referring to fig. 8, the ethernet interface 201 is RJ45, and the network interface chip 203 is a PHY chip. The RJ45 gigabit ethernet interface 201 provides 8 signal line ports, wherein ports 1, 2, 3, and 6 provide two pairs of differential signal lines, the four ports are respectively connected to the coupling module through the first-stage protection device 204 using two pairs of differential signal lines in sequence, taking the first-stage protection device 204 as a gas discharge tube combination as an example, a gas discharge tube combination is connected between a positive signal line and a negative signal line of each pair of differential signal lines, and the gas discharge tube combination is connected to the ground through a gas discharge tube; the remaining port (4, 5, 7, 8) lines of the RJ45 gigabit ethernet interface 201 are idle signal lines, and these ports are connected together and connected to ground through a protection device 801, where the device 801 may be a varistor, a gas discharge tube, or other protection device; the PHY chip 203 provides 4 ports: port1, Port2, Port3, and Port4, the four ports are respectively connected to the coupling module 202 through the second-stage protection device 205 and the current limiting device 601 in sequence by using two pairs of differential signal lines, taking the current limiting device as a resistor and being located near the side of the coupling module as an example, a clamping device is connected between a positive signal line and a negative signal line of each pair of differential signal lines, and the positive signal line and the negative signal line of each pair of differential signal lines are respectively connected to the coupling module 202 through the current limiting resistor. The network signal transmitted from the PHY chip 203 passes through the second-stage protection device 205 and the current limiting device 601, and then reaches the coupling module 202, and the coupling module 202 passes through 1: the output of 1 transmits the network signal to the ethernet interface side, wherein the network signal output by the coupling module 202 passes through the first-stage protection device 204 and then is transmitted to the RJ45 hundred mega ethernet interface 201.
It can be seen from the above description, in the embodiment of the utility model discloses an in between network interface chip and the coupling module second level protector has been increased, but also increase current-limiting device between network interface chip and the coupling module simultaneously, consequently when differential mode surge between the differential signal line pair passes through the coupling module and couples to the secondary side (be the network interface side), current-limiting resistance can reduce the electric current, second level protector (for example TVS) can reduce clamping voltage, thereby guarantee that network interface chip can not punctured by excessive pressure or overcurrent, it compares not have protector between coupling module among the more current technical scheme and the net gape interface chip, can make the energy of secondary side absorb by network interface chip self completely, gain better differential mode protective effect.
Simultaneously, because gas discharge tube has the characteristic of not doing when opening voltage height and voltage are less than a definite value, the mode that uses among the prior art scheme with current-limiting resistance between primary protective device (gas discharge tube) and coupling module primary side (ethernet interface side promptly), can make differential mode surge current all flow through current-limiting resistance, lead to current-limiting resistance to damage easily the utility model discloses an in the embodiment, place the current-limiting device between coupling module and network interface chip, because coupling module comprises magnetic components, consequently can appear the saturation when certain electric current flows, this makes the energy time of differential mode surge when the coupling is to the secondary shorter relatively, and current-limiting resistance is difficult to be damaged.
Furthermore, the utility model discloses a current limiting device in the embodiment can be resistance, and this resistance specification can be for 0603 encapsulation 1/10W, and the encapsulation is little, to the miniaturized equipment that spaces such as security protection camera are little, can realize high-grade protection more easily, has very big advantage.
To sum up, the utility model discloses an embodiment can realize the differential mode and the common mode protection to the ethernet through first order protector, second level protector and current-limiting device, can stand the high energy voltage impact, can react fast again, and the lightning protection prevents that the surge is effectual, can effectively protect the accurate components and parts in the electronic circuit, avoids surge interference's damage.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A network interface circuit comprising an Ethernet interface, a coupling module and a network interface chip, said Ethernet interface being connected to said network interface chip via said coupling module,
a first-stage protection device is connected between a positive signal line and a negative signal line of a differential signal line pair between the Ethernet interface and the coupling module and is connected to the ground through the first-stage protection device;
and a second-stage protection device is connected between a positive signal line and a negative signal line of the differential signal line pair between the coupling module and the network interface chip.
2. The network interface circuit of claim 1, wherein a first level guard device is connected between the positive signal line and the negative signal line of all differential signal line pairs between the ethernet interface and the coupling module, and is connected to ground through the first level guard device; or,
and a first-stage protection device is connected between a positive signal line and a negative signal line of a differential signal line pair for signal transmission between the Ethernet interface and the coupling module, and is connected to the ground through the first-stage protection device, and each signal line in the idle differential signal line pair is connected to a protection device and is connected to the ground through the protection device.
3. The network interface circuit of claim 2, wherein the protection device is a varistor or a gas discharge tube.
4. The network interface circuit of any of claims 1-3, wherein the first stage protection device is a lightning protection device.
5. The network interface circuit of claim 4, wherein the lightning protection device is a three-terminal gas discharge tube, or a combination of two gas discharge tubes in series.
6. The network interface circuit of claim 1, wherein the second stage guard device is a clamp device that connects a positive signal line and a negative signal line of each differential signal line pair between the coupling module and the network interface chip.
7. The network interface circuit of claim 6, wherein the clamping device is a single transient suppression diode, or a combination of multiple transient suppression diodes in parallel, or a combination of a transient suppression diode and a rectifier bridge.
8. The network interface circuit of any one of claims 1, 6 or 7, wherein a current limiting device is further connected between the coupling module and the network interface chip.
9. The network interface circuit of claim 8, wherein the current limiting device is a resistor.
10. The network interface circuit of any of claims 1-3, 6, 7, wherein the coupling module is a network transformer or a 1:1 conversion circuit module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521019451.6U CN205231725U (en) | 2015-12-09 | 2015-12-09 | Network interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521019451.6U CN205231725U (en) | 2015-12-09 | 2015-12-09 | Network interface circuit |
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| Publication Number | Publication Date |
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| CN205231725U true CN205231725U (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521019451.6U Expired - Fee Related CN205231725U (en) | 2015-12-09 | 2015-12-09 | Network interface circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105959063A (en) * | 2016-06-16 | 2016-09-21 | 青岛海信宽带多媒体技术有限公司 | Electrical port module |
| CN107332675A (en) * | 2017-07-31 | 2017-11-07 | 博为科技有限公司 | PoE equipment without network transformer |
| CN113746643A (en) * | 2021-09-08 | 2021-12-03 | 中国航空工业集团公司西安航空计算技术研究所 | Ethernet circuit without network transformer |
| CN114899813A (en) * | 2022-05-30 | 2022-08-12 | 宁波浙大电子有限公司 | Electromagnetic Protection System of Computer Interface |
-
2015
- 2015-12-09 CN CN201521019451.6U patent/CN205231725U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105959063A (en) * | 2016-06-16 | 2016-09-21 | 青岛海信宽带多媒体技术有限公司 | Electrical port module |
| CN105959063B (en) * | 2016-06-16 | 2018-08-10 | 青岛海信宽带多媒体技术有限公司 | Electrical port module |
| CN107332675A (en) * | 2017-07-31 | 2017-11-07 | 博为科技有限公司 | PoE equipment without network transformer |
| CN113746643A (en) * | 2021-09-08 | 2021-12-03 | 中国航空工业集团公司西安航空计算技术研究所 | Ethernet circuit without network transformer |
| CN114899813A (en) * | 2022-05-30 | 2022-08-12 | 宁波浙大电子有限公司 | Electromagnetic Protection System of Computer Interface |
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Granted publication date: 20160511 Termination date: 20201209 |
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| CF01 | Termination of patent right due to non-payment of annual fee |