CN205753397U - A kind of Ethernet interface protection filter design circuit - Google Patents

A kind of Ethernet interface protection filter design circuit Download PDF

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Publication number
CN205753397U
CN205753397U CN201620510535.8U CN201620510535U CN205753397U CN 205753397 U CN205753397 U CN 205753397U CN 201620510535 U CN201620510535 U CN 201620510535U CN 205753397 U CN205753397 U CN 205753397U
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China
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circuit
interface
filter
network transformer
protection
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CN201620510535.8U
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Chinese (zh)
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林炽贺
石光其
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Shenzhen SES Technology Co., Ltd.
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Shenzhen City Sheng Technology Ltd By Share Ltd
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Abstract

This utility model provides a kind of Ethernet interface protection filter design circuit, including the interface socket being sequentially connected with, one-level protection circuit, network transformer, two stages of circuit and filter circuit, one-level protection circuit includes transient voltage suppressor and for suppressing the gas-discharge tube of the common mode surge energy on cable, transient voltage suppressor is electrically connected with two pairs of RX and TX interfaces of network transformer, one end ground connection of gas-discharge tube, the TXB CT interface of other end electrical connection network transformer;Two stages of circuit includes the diode for suppressing the transformer coupled surge energy come, electric source filter circuit includes the filter capacitor that the CT interface with network transformer is electrically connected with and the power filter magnetic bead being connected in series with power supply Introduced cases, by arranging one-level protection circuit, two stages of circuit and filter circuit simultaneously, preferably resolve the lightning protection capability of interface circuit, and the contradiction between circuit performance and product design costs can be coordinated.

Description

A kind of Ethernet interface protection filter design circuit
[technical field]
This utility model relates to electronic circuit technology field, particularly relates to one and can preferably solve interface circuit Lightning protection capability, and the Ethernet interface protection filter of contradiction between circuit performance and product design costs can be coordinated Ripple design circuit.
[background technology]
Conventional Ethernet interface is 10/100Base-TX, 10/100Base-2 and 10/100Base-5, ether Network interface is the most all at indoor cabling, but in the poor residential quarter of some environment or cities and towns, place, rural area, Owing to the entry position of broadband network information is counted limited, the installation dimension of ethernet line the most all can be more than 50 Rice, and in extreme circumstances, the Ethernet interface of equipment component connects cable may go out family cabling, can exist and wear More (LPZ0 district is affected by the high-risk danger zone of direct stroke, also cross this region in the LPZ0 district of lightning protection subregion The biggest thunder and lightning magnetic field impulse can be sensed on cable) situation, the ethernet switching device under this scene must be examined Consider the lightning protection capability design increasing interface circuit, it is ensured that the reliable use of equipment.
This type of uses the networking products of scene all to have the highest to product cost, volumetric spaces, EMI radiation transmitting simultaneously Requirement, traditional ethernet interface circuit design circuit can not meet product requirement, the most effectively solve Certainly the contradiction between high-magnitude lightning protection capability and low production design cost demand, is that those skilled in the art often think The problem examined.
[utility model content]
For overcoming the problem existing for prior art, this utility model provides one can preferably solve interface electricity The lightning protection capability on road, and the Ethernet interface protection of contradiction between circuit performance and product design costs can be coordinated Filter design circuit.
This utility model solves the scheme of technical problem and is to provide a kind of Ethernet interface protection filter design circuit, bag Include interface socket, one-level protection circuit, network transformer, two stages of circuit and the filter circuit being sequentially connected with, Described network transformer connects electric source filter circuit;
Described one-level protection circuit include on limiting circuitry the transient voltage suppressor of glitch and At least one is for suppressing the gas-discharge tube of the common mode surge energy on cable, and described transient voltage suppresses two poles Pipe is electrically connected with two pairs of RX and TX interfaces of network transformer, one end ground connection of gas-discharge tube, the other end The TXB-CT interface of electrical connection network transformer;
Described two stages of circuit includes the diode for suppressing the transformer coupled surge energy come, described Diode is connected in parallel between the output lead of RD+ interface and RD-interface and TD+ interface and TD-interface respectively Output lead between;
Described filter circuit includes the filtering magnetic bead being connected between gas-discharge tube and TXB-CT interface;
Described electric source filter circuit include filter capacitor that CT interface with network transformer is electrically connected with and with The power filter magnetic bead that power supply Introduced cases is connected in series.
Preferably, the diode in described two stages of circuit is secondary protection transient voltage suppressor.
Preferably, the dividing strip spacing of described network transformer each interface connecting line is more than 200 mils.
Preferably, described network transformer primary and secondary circuit on the placement direction of PCB is isolated entirely from, All plane layers under network transformer primary edge hollow out process.
Preferably, described each transient voltage suppressor, gas-discharge tube, filter capacitor, two grades of protection electricity The diode on road and filtering magnetic bead are all arranged near the interface of network transformer.
Preferably, described interface socket is RJ45 interface.
Preferably, described gas-discharge tube is also connected in parallel to filter capacitor in the connection circuit of interface socket.
Compared with prior art, this utility model one Ethernet interface protection filter design circuit is by arranging simultaneously One-level protection circuit, two stages of circuit and filter circuit, one-level protection circuit is provided for wink on limiting circuitry Transient voltage suppressor D3 of state interference and for suppressing the gas discharge of common mode surge energy on cable Pipe GDT, two stages of circuit is provided for suppressing the diode of the transformer coupled surge energy come, filtering Circuit arranges the filtering magnetic bead L2 that gas-discharge tube GDT and TXB-CT interface is connected, is used for filtering differential lines On interference, prevent interference to be transferred to electric power network, the interference of power supply also can be prevented to be transferred to differential signal simultaneously, Can preferably solve the lightning protection capability of interface circuit, and can coordinate between circuit performance and product design costs Contradiction.
[accompanying drawing explanation]
Fig. 1 is the modular construction schematic diagram of a kind of Ethernet interface of this utility model protection filter design circuit.
Fig. 2 is the electrical block diagram of a kind of Ethernet interface of this utility model protection filter design circuit.
[detailed description of the invention]
For making the purpose of this utility model, technical scheme and advantage are clearer, below in conjunction with accompanying drawing and reality Execute example, this utility model is further elaborated.Should be appreciated that specific embodiment described herein It is used only for explaining this utility model, is not used to limit this utility model.
Referring to Fig. 1 to Fig. 2, this utility model one Ethernet interface protection filter design circuit 1 includes successively Interface socket, one-level protection circuit, network transformer, two stages of circuit and the filter circuit connected, described Network transformer connects electric source filter circuit;Described one-level protection circuit includes glitch on limiting circuitry Transient voltage suppressor D3 and at least one is for suppressing the gas of common mode surge energy on cable to put Fulgurite GDT, described transient voltage suppressor D3 electrically connects with two pairs of RX and TX interfaces of network transformer Connect, one end ground connection of gas-discharge tube GDT, the TXB-CT interface of other end electrical connection network transformer;Institute State two stages of circuit and include the diode (D1, D2) for suppressing the transformer coupled surge energy come, Described diode is connected in parallel between the output lead of RD+ interface and RD-interface and TD+ interface and TD-respectively Between the output lead of interface;Described filter circuit include being connected to gas-discharge tube GDT and TXB-CT interface it Between filtering magnetic bead L2;Described electric source filter circuit includes the filter that the CT interface with network transformer is electrically connected with Ripple electric capacity and the power filter magnetic bead L1, power filter magnetic bead L1 that are connected in series with power supply Introduced cases are used for filtering Except the interference on holding wire.
By arranging one-level protection circuit, two stages of circuit and filter circuit simultaneously, one-level protection circuit is arranged On limiting circuitry glitch transient voltage suppressor D3 and for suppress on cable common mode wave Gushing the gas-discharge tube GDT of energy, two stages of circuit is provided for suppressing the transformer coupled surge energy come The diode of amount, arranges the filtering magnetic bead L2 that gas-discharge tube GDT and TXB-CT interface is connected in filter circuit, For filtering the interference in differential lines, prevent interference to be transferred to electric power network, also can prevent the interference of power supply simultaneously Be transferred to differential signal, it is possible to preferably solve the lightning protection capability of interface circuit, and can coordinate circuit performance and Contradiction between product design costs.
Transient voltage suppressor D3 is used for that glitch is such as on limiting circuitry: electrostatic, impulse train etc., Prevent interference by stage circuit under the influence of holding wire.Filter circuit can effectively reduce GDT electric discharge moment generation High frequency spikes pulse impact that whole interface circuit is caused.
Gas-discharge tube GDT is mainly used to common mode surge energy of releasing, before meeting surge test through-current capability Put, the labeling device of low residual voltage should be chosen as far as possible.
Preferably, the diode in described two stages of circuit is secondary protection transient voltage suppressor,
Preferably, the dividing strip spacing of described network transformer each interface connecting line is more than 200 mils, it is ensured that Primary and secondary coupling minimum.
Preferably, described network transformer primary and secondary circuit on the placement direction of PCB is isolated entirely from, All plane layers under network transformer primary edge hollow out process.
Preferably, described each transient voltage suppressor, gas-discharge tube, filter capacitor, two grades of protection electricity The diode on road and filtering magnetic bead are all arranged near the interface of network transformer, it is ensured that lead-in inductance is minimum, to protect Card protective device can carry out protection action normally.
Preferably, described interface socket is RJ45 interface.
Preferably, described gas-discharge tube GDT is also connected in parallel to filtered electrical in the connection circuit of interface socket Hold C11.
This utility model design greatly enhances the Ethernet interface protective capacities of the conventional low side network switching equipment, Simultaneously can the design cost reducing Ethernet interface to the full extent and PCB layout difficulty, by this electricity The equipment of road design circuit protective capacities in reality is tested can reach following index:
Compared with prior art, this utility model one Ethernet interface protection filter design circuit 1 is by setting simultaneously Putting one-level protection circuit, two stages of circuit and filter circuit, one-level protection circuit is provided on limiting circuitry Transient voltage suppressor D3 of glitch and for suppressing the gas of the common mode surge energy on cable to put Fulgurite GDT, two stages of circuit is provided for suppressing the diode of the transformer coupled surge energy come, filter Wave circuit arranges the filtering magnetic bead L2 that gas-discharge tube GDT and TXB-CT interface is connected, is used for filtering difference Interference on line, prevents interference to be transferred to electric power network, and the interference of power supply also can be prevented to be transferred to difference letter simultaneously Number, it is possible to preferably solve the lightning protection capability of interface circuit, and circuit performance and product design costs can be coordinated Between contradiction.
Above-described this utility model embodiment, is not intended that the restriction to this utility model protection domain. Any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, all should comprise Within claims of the present utility model.

Claims (7)

1. an Ethernet interface protection filter design circuit, it is characterised in that: include that the interface being sequentially connected with is inserted Seat, one-level protection circuit, network transformer, two stages of circuit and filter circuit, described network transformer is even Connect electric source filter circuit;
Described one-level protection circuit include on limiting circuitry the transient voltage suppressor of glitch and At least one is for suppressing the gas-discharge tube of the common mode surge energy on cable, and described transient voltage suppresses two poles Pipe is electrically connected with two pairs of RX and TX interfaces of network transformer, one end ground connection of gas-discharge tube, the other end The TXB-CT interface of electrical connection network transformer;
Described two stages of circuit includes the diode for suppressing the transformer coupled surge energy come, described Diode is connected in parallel between the output lead of RD+ interface and RD-interface and TD+ interface and TD-interface respectively Output lead between;
Described filter circuit includes the filtering magnetic bead being connected between gas-discharge tube and TXB-CT interface;
Described electric source filter circuit include filter capacitor that CT interface with network transformer is electrically connected with and with The power filter magnetic bead that power supply Introduced cases is connected in series.
2. a kind of Ethernet interface protection filter design circuit as claimed in claim 1, it is characterised in that: institute Stating the diode in two stages of circuit is secondary protection transient voltage suppressor.
3. a kind of Ethernet interface protection filter design circuit as claimed in claim 1, it is characterised in that: institute The dividing strip spacing stating network transformer each interface connecting line is more than 200 mils.
4. a kind of Ethernet interface protection filter design circuit as claimed in claim 3, it is characterised in that: institute Stating network transformer primary and secondary circuit on the placement direction of PCB to be isolated entirely from, network transformer is primary All plane layers under limit hollow out process.
5. a kind of Ethernet interface protection filter design circuit as claimed in claim 1, it is characterised in that: institute State each transient voltage suppressor, gas-discharge tube, filter capacitor, the diode of two stages of circuit and filter Ripple magnetic bead is all arranged near the interface of network transformer.
6. a kind of Ethernet interface protection filter design circuit as claimed in claim 1, it is characterised in that: institute Stating interface socket is RJ45 interface.
7. a kind of Ethernet interface protection filter design circuit as claimed in claim 6, it is characterised in that: institute State gas-discharge tube and be also connected in parallel to filter capacitor in the connection circuit of interface socket.
CN201620510535.8U 2016-05-24 2016-05-24 A kind of Ethernet interface protection filter design circuit Active CN205753397U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620510535.8U CN205753397U (en) 2016-05-24 2016-05-24 A kind of Ethernet interface protection filter design circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620510535.8U CN205753397U (en) 2016-05-24 2016-05-24 A kind of Ethernet interface protection filter design circuit

Publications (1)

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CN205753397U true CN205753397U (en) 2016-11-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109347081A (en) * 2018-12-19 2019-02-15 广州广电计量检测股份有限公司 A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance
CN113067648A (en) * 2021-03-29 2021-07-02 吉林大学 Vehicle electric control system electromagnetic pulse protection method based on optical fiber network
CN113438034A (en) * 2021-06-15 2021-09-24 深圳市速联技术有限公司 Filtering type strong transient electromagnetic pulse protection structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109347081A (en) * 2018-12-19 2019-02-15 广州广电计量检测股份有限公司 A kind of high-grade carrying out surge protection and the design of the ethernet interface circuit of high EMI performance
CN113067648A (en) * 2021-03-29 2021-07-02 吉林大学 Vehicle electric control system electromagnetic pulse protection method based on optical fiber network
CN113438034A (en) * 2021-06-15 2021-09-24 深圳市速联技术有限公司 Filtering type strong transient electromagnetic pulse protection structure

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CP03 Change of name, title or address

Address after: 518000 T3B5-505A Software Building No. 11 South 7 High-tech Road, Yuehai Street, Nanshan District, Shenzhen City, Guangdong Province

Patentee after: Shenzhen SES Technology Co., Ltd.

Address before: 518000 Room 401 5, Fengyun Science and Technology Building, No. 5 Industrial Zone, North District, Nanshan High-tech Zone, Shenzhen City, Guangdong Province (office only)

Patentee before: Shenzhen City Sheng technology Limited by Share Ltd

CP03 Change of name, title or address