CN207010229U - A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit - Google Patents
A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit Download PDFInfo
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- CN207010229U CN207010229U CN201720979549.9U CN201720979549U CN207010229U CN 207010229 U CN207010229 U CN 207010229U CN 201720979549 U CN201720979549 U CN 201720979549U CN 207010229 U CN207010229 U CN 207010229U
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Abstract
The utility model provides a kind of gigabit Ethernet mouth electromagnetic compatible protective circuit, including：First order circuit, second level circuit, tertiary circuit and fourth stage circuit, the electromagnetic compatible protective circuit can be tested by 4KV lightning surge, 8KV contact electrostatic test can be passed through, it can be tested by voltage 2KV frequencies 5KHz electrical fast transient (eft), it can be tested by testing field strength 10V/m conduction interference immunity to interference, it can be tested by testing field strength 10V/m radio frequency electromagnetic field radiation immunity, it is and few using device, take small volume, cost is cheap, especially suitable for needing the industrial ethernet switch equipment of integrated multiple network interfaces.
Description
Technical field
It the utility model is related to electromagnetic compatible protective technical field, and in particular to a kind of gigabit Ethernet mouth electromagnetic compatibility is prevented
Protection circuit.
Background technology
Electric power and field of track traffic environment are more severe, require very high again for the reliability of data, therefore to network
The EMC Requirements of equipment are very comprehensively very strict.
Existing network interface protection circuit is all to lay particular emphasis on antistatic and anti-lightning strike, not for the whole electromagnetic compatibility of network interface
Protection.The particularly existing network interface objective of defense is all B level standards, i.e., equipment is not damaged but performance has declined.It is but real
The network equipment on border for electric power is not only to want antistatic and anti-lightning strike, will also anti-electrical fast transient (eft), anti-conduction
Harassing and wrecking and preventing RF electromagnetic field radiation etc..Even under the such particular surroundings of transformer station, the network equipment not only requires not damage
It is exactly can not have any loss of data for the network equipment, it is desirable to A level standards and performance can't decline.
Either existing some network interface protection circuits protection is not comprehensive, or do not reach A level standards, otherwise the volume of circuit
It is too big.It is specific as follows：
As shown in figure 1, first order circuit, including the centre cap of every a pair of transformers differential lines is with casing
Between two-way transient state voltage limiting device；Second level circuit, including it is connected on the current limliting resettable fuse and TVS battle arrays of secondary coil
Row, current limliting resettable fuse are serially connected in differential lines to inner, differential lines and core between current limliting resettable fuse and PHY chip
TVS arrays are connected between piece signal ground.The lightning protection circuit can only be tested by 2KV lightning surge, if to pass through 4KV thunder
Surge common-mode signal is hit, the TVS pipe in first order circuit can be changed to gas-discharge tube into, but gas-discharge tube compares TVS
Pipe volume is much greater；If to need to change the bigger self- recoverage of through-current capability by 4KV lightning surge difference mode signal
Fuse, general resettable fuse through-current capability is bigger, and volume is bigger, when through-current capability reaches to a certain degree, at all can not
The device encapsulated with paster, it is necessary to which using direct inserting device, direct inserting device volume is bigger, the voltage stabilizing IC through-current capabilities shown in circuit
It is very low, and the IC through-current capabilities of this kind of function are not accomplished very high, it is necessary to change other types of chip, it is necessary to be related to electricity yet
The modification on road.So wanting to test by 4KV lightning surge, existing scheme needs to change device and changes circuit, especially
The problem of device can bring volume largely to increase is changed, is particularly exchanged in the EPA with multiple gigabit Ethernet mouths
On machine, the increase of volume is a very big challenge.
As shown in Figure 2 A and 2 B, first order circuit, the centre caps of transformer differential lines and protecting field it
Between gas-discharge tube；Second level circuit, including it is connected on the TVS arrays and current-limiting resistance of secondary coil differential lines.The circuit
Had no problem by 4KV lightning surge test, but the circuit is only the protection for having paid attention to lightning surge, without paying close attention to
The protection of electrostatic, electrical fast transient (eft), conduction interference and radio frequency electromagnetic field radiation.Such equipment is only that can be used only in
Common outdoor, and cannot be used under the more complicated environment of electromagnetic field.
Utility model content
The purpose of this utility model is to be directed to above-mentioned the deficiencies in the prior art, there is provided a kind of gigabit Ethernet mouth electromagnetism
Compatible protection circuit, under the more complicated environment of electromagnetic field, can full protection, and A level standards can be reached.
To achieve the above object, the utility model employs following technical scheme：
The utility model provides a kind of gigabit Ethernet mouth electromagnetic compatible protective circuit, including：
First order circuit, including isolating transformer, network connecting head, network chip, the network connecting head, the isolation
Transformer and the network chip are sequentially connected；The centre cap and casing of the short circuit of the primary coil of the isolating transformer
Between connect gas-discharge tube and high-voltage capacitance, the gas-discharge tube and the high-voltage capacitance and be arranged in parallel, the gas is put
Fulgurite and described high-voltage capacitance one end ground connection；
Second level circuit, including TVS array chips, the TVS array chips are connected across the secondary of the isolating transformer
On coil, the grounding leg ground connection of the TVS array chips；
Tertiary circuit, including the common mode inductance being serially connected on network differential line, and the ceramic electrical of each pair differential lines over the ground
Hold；The ceramic condenser is arranged on the common mode inductance close to the side of the network chip；
Fourth stage circuit, including decoupling resistance, the decoupling resistance are connected to the common mode inductance and the network chip
Between.
Further, the highest impedance frequency of the common mode inductance is 1000Mhz.
Further, the power of the TVS array chips is at least above 400W.
Further, the high-voltage capacitance is 1000pF/2KV.
Further, transformer coil of the primary coil between the isolating transformer and the network connecting head；
Transformer coil of the secondary coil between the isolating transformer and the network chip.
The beneficial effects of the utility model are：The electromagnetic compatible protective circuit can be tested by 4KV lightning surge, can
By 8KV contact electrostatic test, can be tested by voltage 2KV frequencies 5KHz electrical fast transient (eft), Ke Yitong
Overtesting field strength 10V/m conduction interference immunity to interference test, can be by testing field strength 10V/m radio frequency electromagnetic field radiation anti-interference
Degree test, and using device it is few, take small volume, cost is cheap, especially suitable for need integrate multiple network interfaces industry with
Too network switch equipment.
Brief description of the drawings
Fig. 1 is the circuit diagram of one of the network interface protection circuit of prior art；
Fig. 2A is two circuit diagram of the network interface protection circuit of prior art；
Fig. 2 B are two circuit diagram of the network interface protection circuit of prior art；
Fig. 3 is a kind of circuit diagram of gigabit Ethernet mouth electromagnetic compatible protective circuit.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with the accompanying drawings and implement
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this
Utility model, it is not used to limit the utility model.
The electromagnetic compatible protective circuit makes full use of the super large through-current capacity of gas-discharge tube to protect common mode surge, utilizes net
The insulating properties guard section differential mode surge of network transformer, electrostatic and electric fast transient arteries and veins are protected using the fast reaction of TVS pipe
Group is rushed, is cancelled each other using the magnetic field of common mode inductance, so as to eliminate the common mode interference signal of coupling network access line, using by decoupling electricity
The RC capacitance-resistance filter filtering common mode high-frequency signals that resistance and ceramic condenser are formed, also it is used for protecting previous circuit using resistance
Residual voltage, prevent residual circuitry from entering chip.
As shown in figure 3, a kind of gigabit Ethernet mouth electromagnetic compatible protective circuit, including：
First order circuit, including isolating transformer T1, network connecting head 1, network chip 7, the network connecting head 1, institute
State isolating transformer T1 and the network chip 7 is sequentially connected；The center of the short circuit of the primary coil of the isolating transformer T1
Gas-discharge tube G1 and high-voltage capacitance C1, the gas-discharge tube G1 and the high-voltage capacitance C1 are connected between tap and casing ground
It is arranged in parallel, the gas-discharge tube G1 and described high-voltage capacitance C1 one end ground connection；
Second level circuit, including TVS array chips 3, the TVS array chips 3 are connected across the isolating transformer T1's
On secondary coil, the grounding leg ground connection of the TVS array chips 3；
Tertiary circuit, including the common mode inductance 4 being serially connected on network differential line, and the ceramic electrical of each pair differential lines over the ground
Hold 6；The ceramic condenser 6 is arranged on the common mode inductance 4 close to the side of the network chip 7；
Fourth stage circuit, including decoupling resistance 5, the decoupling resistance 5 are connected to the common mode inductance 4 and the network core
Between piece 7.
The highest impedance frequency of the common mode inductance 4 is 1000Mhz.
The power of the TVS array chips 3 is at least above 400W.
The high-voltage capacitance C1 is 1000pF/2KV.
Transformer coil of the primary coil between the isolating transformer T1 and the network connecting head 1；It is described
Transformer coil of the secondary coil between the isolating transformer T1 and the network chip 7.
Network connecting head 1 is RJ45 network connecting heads；Gas-discharge tube G1 is GDTN2RS5-230；TVS array chips 3 are
WS05-4RUL；Common mode inductance 4 is WCM-2012-371T；The ceramic condenser 6 is common 0603 encapsulation 3.3PF electric capacity；It is described
Decoupling resistance 5 is 2.2 Ohmic resistances of common 0603 encapsulation.
Isolating transformer T1 is kilomega network transformer, high-voltage capacitance C1 can cut-in voltage be 230V and through-current capacity is
5KA gas-discharge tube G1, gas-discharge tube G1 are connected between isolating transformer T1 primary coils centre cap and protecting field, high
Voltage capacitance C1 be it is pressure-resistant be high-voltage capacitance that 2KV capacitances are 1000pF, high-voltage capacitance is connected in parallel on gas-discharge tube, TVS arrays
Chip 3 has two, and two TVS array chips 3 are connected in parallel in the differential lines of isolating transformer T1 secondary coils respectively so that difference
Line forms existing differential mode common mode protection again.Wherein, two TVS array chips 3 abut isolating transformer T1 side；L1、L2、
L3, L4 are the common mode inductance 4 of 370 ohm of impedance, and common mode inductance 4 is connected on TVS array chips 3 and is connected on below in differential lines, R1,
R2, R3, R4, R5, R6, R7 and R8 are common 0,603 2.2 Ohmic resistances of encapsulation, and resistance is placed in common mode inductance 4 and network chip 7
Between be connected in differential lines, C2, C3, C4, C5, C6, C7, C8, C9 are 0603 encapsulation 3.3pF ceramic condenser, and electric capacity is placed on electricity
Resistance is connected in parallel on circuit below, and resistance and electric capacity form RC wave filters, and this RC wave filter is connected to common mode inductance 4 and network core
The centre of piece 7.
The protection implementation of electrostatic is as described below.Electrostatic cannot directly enter RJ45 internal cores and can only beat first
On RJ45 shells, but the voltage of electrostatic is very high and the time is very short, can produce strong electromagnetic radiation, this strong electromagnetism
Signal enters network transformer from Space Coupling to RJ45 internal cores or the netting twine of surrounding, then from RJ45 cored wire.By
There was only for 1 nanosecond in the rise time of electrostatic, and the reaction time of gas-discharge tube was essentially all 100 nanoseconds, so gas is put
Fulgurite is not opened immediately, and electrostatic is coupled to secondary by network transformer.Because the reaction time of TVS arrays was less than for 1 nanosecond,
So most of electrostatic signal is released to ground by TVS array chips, then residue signal is again by the common mode inductance sealed in
To absorb.
The implementation of lightning surge protection is as described below.After lightning surge common-mode signal enters RJ45, common-mode voltage
Also not above the insulation pressure voltage of isolating transformer, lightning surge common-mode signal is entirely isolated in RJ45 sides, will not be to chip
Impact, when the voltage of the centre tapped energy accumulation of isolating transformer exceedes the breakdown voltage of flue, gas is put
Fulgurite breakdown conducting, lightning stroke surge energy are all released to ground, after energy is released, gas-discharge tube from gas-discharge tube
Recover normal high-impedance state；After lightning surge difference mode signal enters RJ45, the HFS energy of lightning stroke surge energy passes through
It is transformer coupled that RJ45, most energy of lightning stroke surge energy are directly flowed out by primary to secondary, low frequency energy
Amount all concentrates on low frequency part, so the energy for being coupled to secondary is not too large, the energy overwhelming majority for being coupled to secondary passes through
TVS pipe is absorbed, and remaining a small amount of energy is absorbed by decoupling resistance, and the effect of decoupling resistance is actually to reduce TVS pipe
Influence of the residual voltage to network chip, actual test have been found that this decoupling resistance useless, and differential mode grade can only achieve 2KV, there is this
After decoupling resistance, differential mode grade can reach 6KV.Need exist for explanation, the power of TVS pipe has to sufficiently large at least
More than 400 watts, otherwise it is likely to burn out.
The protection implementation of electrical fast transient (eft) is as described below.Electrical fast transient (eft) is a series of transient state
Impulse train harass, its feature be the rise time quickly, the duration is short, and energy is low, but has higher repetition rate.It is electric fast
Fast transient pulse train will not typically cause the damage of equipment, but due to that with very wide interference spectrum, can work equipment and produce
Influence.Its interference mechanism is that electrical fast transient (eft) accumulates to the semiconductor devices junction capacity trickle charge in circuit, is caused
The malfunction of device or even circuit.During the interference that Clusters signal applies to netting twine, signal generator passes through coupling
Distribution capacity between folder and netting twine enters netting twine, and this interference injection belongs to common mode.When electrical fast transient (eft) is total to
After mould signal enters RJ45, gas-discharge tube is not opened immediately, and electrical fast transient (eft) signal passes through network transformer coupling
Secondary, TVS array immediate responses are closed, so part electrical fast transient (eft) common-mode signal is released to ground by TVS arrays.
Because electrical fast transient (eft) quickly repeats, TVS arrays are caused to recover in time, so there is most of electric fast transient
The common-mode signal of impulse train is entered in common mode inductance, is in now resistive to High-frequency Interference using common mode inductance medium-high frequency ferrite
It can directly absorb and be converted into heat, interference signal at this moment is largely all weakened, then will also be by RC wave filters again
Secondary absorption, just it is wholly absent to this electrical fast transient (eft) signal.
The protection implementation of conduction interference is as described below.The existing common-mode signal of conduction interference signal has difference mode signal again.
Common-mode signal is usually high frequency, and difference mode signal is usually low frequency.After conduction interference common-mode signal enters RJ45, gas discharge
Pipe is not opened immediately, and conduction interference common-mode signal is coupled to secondary, TVS array immediate responses by network transformer, and incites somebody to action
Most of energy is released to ground, and then remaining common-mode signal is entered in common mode inductance, recycles common mode inductance medium-high frequency iron
Oxysome can directly be absorbed in resistive to High-frequency Interference and be converted into heat, and interference signal at this moment, which is substantially all, to be weakened, so
Also to be absorbed by RC wave filters, be just wholly absent to this conduction interference common-mode signal again afterwards.Conduction interference difference mode signal
It is remaining by net because difference mode signal frequency than relatively low major part all flows back to RJ45 by network transformer primary into after RJ45
Network is transformer coupled to secondary, and then TVS pipe absorption is most of, and last seldom energy is fallen by resistance absorption.
The implementation of radio frequency electromagnetic field radiation immunity is as described below.The radio frequency electromagnetic field radiation immunity of general device
All it is to be completed by device housings, only in sub-fraction electromagnetic field couples to netting twine, then enters back into RJ45.Radio frequency electromagnetic field
Radiation signal is that frequency is higher than conduction interference common-mode signal, what others were just as.It it requires common mode inductance covering more
Wide frequency.Therefore it have selected the common mode inductance that highest impedance frequency is 1000Mhz.
In summary, electrostatic protection is resisted by transformer, TVS pipe and common mode inductance；Lightning surge common mode energy is by becoming
Insulating properties, gas-discharge tube and the TVS pipe of depressor is resisted；Lightning surge differential mode energy is by transformer, TVS pipe and decoupling electricity
Hinder to resist；Electrical fast transient (eft) protection is resisted by transformer, TVS pipe, common mode inductance and RC wave filters；Conduction is disturbed
The protection and the protection of radio frequency electromagnetic field radiation immunity disturbed are supported by transformer, TVS pipe, common mode inductance and RC wave filters
It is anti-.
Embodiment described above only expresses embodiment of the present utility model, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the utility model patent scope can not be interpreted as.It should be pointed out that the ordinary skill for this area
For personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these belong to this
The protection domain of utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (5)
- A kind of 1. gigabit Ethernet mouth electromagnetic compatible protective circuit, it is characterised in that including：First order circuit, including isolating transformer, network connecting head, network chip, the network connecting head, the isolation transformation Device and the network chip are sequentially connected；Between the centre cap and casing ground of the short circuit of the primary coil of the isolating transformer Connection gas-discharge tube and high-voltage capacitance, the gas-discharge tube and the high-voltage capacitance are arranged in parallel, the gas-discharge tube It is grounded with described high-voltage capacitance one end；Second level circuit, including TVS array chips, the TVS array chips are connected across the secondary coil of the isolating transformer On, the grounding leg ground connection of the TVS array chips；Tertiary circuit, including the common mode inductance being serially connected on network differential line, and the ceramic condenser of each pair differential lines over the ground；Institute State ceramic condenser and be arranged on the common mode inductance close to the side of the network chip；Fourth stage circuit, including decoupling resistance, the decoupling resistance are connected between the common mode inductance and the network chip.
- A kind of 2. gigabit Ethernet mouth electromagnetic compatible protective circuit according to claim 1, it is characterised in that：The common mode The highest impedance frequency of inductance is 1000Mhz.
- A kind of 3. gigabit Ethernet mouth electromagnetic compatible protective circuit according to claim 1, it is characterised in that：The TVS The power of array chip is at least above 400W.
- A kind of 4. gigabit Ethernet mouth electromagnetic compatible protective circuit according to claim 1, it is characterised in that：The high pressure Electric capacity is 1000pF/2KV.
- A kind of 5. gigabit Ethernet mouth electromagnetic compatible protective circuit according to claim 1, it is characterised in that：The primary Transformer coil of the coil between the isolating transformer and the network connecting head；The secondary coil becomes for the isolation Transformer coil between depressor and the network chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720979549.9U CN207010229U (en) | 2017-08-08 | 2017-08-08 | A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720979549.9U CN207010229U (en) | 2017-08-08 | 2017-08-08 | A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit |
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| CN207010229U true CN207010229U (en) | 2018-02-13 |
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| CN201720979549.9U Active CN207010229U (en) | 2017-08-08 | 2017-08-08 | A kind of gigabit Ethernet mouth electromagnetic compatible protective circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117060873A (en) * | 2023-08-16 | 2023-11-14 | 上海凌世电磁技术有限公司 | Multistage common-differential mode hybrid filtering electric fast transient pulse group decoupling network |
-
2017
- 2017-08-08 CN CN201720979549.9U patent/CN207010229U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN117060873A (en) * | 2023-08-16 | 2023-11-14 | 上海凌世电磁技术有限公司 | Multistage common-differential mode hybrid filtering electric fast transient pulse group decoupling network |
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