CN106159921A - A kind of port lightning preventing circuit - Google Patents
A kind of port lightning preventing circuit Download PDFInfo
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- CN106159921A CN106159921A CN201510195566.9A CN201510195566A CN106159921A CN 106159921 A CN106159921 A CN 106159921A CN 201510195566 A CN201510195566 A CN 201510195566A CN 106159921 A CN106159921 A CN 106159921A
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- cabling
- resistance
- electric capacity
- preventing circuit
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Abstract
The invention provides a kind of port lightning preventing circuit, it is arranged on the PCB comprising non-lightning protection circuit, this port lightning preventing circuit includes the first order circuit terminating between RJ45 connector and network isolation transformer and the second level circuit terminating between network isolation transformer and network chip, transformer coil between described network isolation transformer and described RJ45 connector is defined as primary coil, transformer coil between described network isolation transformer and described network chip is defined as secondary coil, described port lightning preventing circuit also includes the first cabling group being made up of first order connection and the second cabling group being made up of described second level connection, wherein, the spacing of the cabling with the non-lightning protection circuit on described PCB for the described first cabling group is disposed as 60mil.The port lightning preventing circuit of the present invention, can pass through IEC61000-4-5 or GB17626.5 standard, reaches common mode 2kV and difference touches the interface lightning protection test request of unmasked balanced signal of 1kV, and the device of employing is less, taken up space, area little.
Description
Technical field
The present invention relates to circuit engineering field, more particularly, it relates to a kind of port lightning preventing circuit and method.
Background technology
The port lightning preventing circuit using at present and RJ45 interface arrangement thereof, be based on the two-way transient state voltage-stablizer of increase
Part TVS pipe or discharge tube device, and be applied to this lightning protection circuit scheme on printed circuit board (PCB) (PCB).
But this network's thunder circuit, substantially required device is very many, and in order to ensure that lightning protection is imitated
Fruit and network transmission performance, it usually needs use the devices such as gas-discharge tube, TVS pipe, diode, resistance,
And the number of devices that uses is many, volume is big, need to take the board space of vast scale, costs rather expensive,
The more important thing is that this lightning protection circuit is quite a lot of due to the number of devices using, the lightning protection component volume phase of use
When greatly, cannot designing on mainboard or on network interface card in a lot of occasions at all.
In existing schemes of prevention against lightning, the device such as transient state voltage-stabilizing device (TVS pipe), diode is applied directly to
On network signal line, on every network signal line, two resistance of concatenation can cause greatly declining of kilomega network performance
Subtract, affect network transmission performance.When using this lightning protection circuit on kilomega network, TVS pipe is applied directly to
On network signal transmission line, owing to the economize on electricity of TVS pipe is held very big, and concatenate on every network signal line
Two resistance and specialty lightning protection IC, all can cause and decay greatly in kilomega network performance, affect network transmit
Performance, meanwhile, lightning protection IC is expensive for specialty, causes schemes of prevention against lightning high cost.
Summary, existing schemes of prevention against lightning, use device many, all suitable costliness of cost, the lightning protection device of use
Part volume is relatively big, cannot design on mainboard or on network interface card in a lot of occasions at all, needs to use in cabinet
Portion's independent design lightning protection circuit, or by using its method of additional lightning protection outside cabinet, but this
Way cost is also very high, and volume is also very big, assembles and uses unreliable also inconvenient, and network signal
Insertion loss crosses conference affects network transmission quality.
Content of the invention
The technical problem to be solved in the present invention is, for the weak point of existing port lightning preventing, provides one
Planting port lightning preventing circuit, this port lightning preventing circuit is arranged on PCB, by this port lightning preventing circuit at PCB
On cabling isolation layout realize that lightning protection requires, be allowed to meet the lightning protection meeting common mode 2kV and differential mode 1kV
Require, simultaneously, it is not necessary to increase lightning protection component.
The technical scheme that the present invention solves the problems referred to above there is provided a kind of port lightning preventing circuit, is arranged on and comprises
On the PCB of non-lightning protection circuit, this port lightning preventing circuit includes terminating at RJ45 connector and Network Isolation transformation
First order circuit between device and terminate at second level line between network isolation transformer and network chip
Road, the transformer coil between described network isolation transformer and described RJ45 connector is defined as primary line
Circle, the transformer coil between described network isolation transformer and described network chip is defined as secondary coil,
It is characterized in that, described port lightning preventing circuit also include the first cabling group of being made up of first order connection with
And the second cabling group being made up of described second level connection, wherein, described first cabling group with described
The spacing of the cabling of the non-lightning protection circuit on PCB arranges and is 60mil.
In above-mentioned port lightning preventing circuit, described first order circuit include the first resistance, the second resistance, the 3rd
Resistance, the 4th resistance and high-voltage capacitance, described first cabling group includes:
By four of the primary coil of described network isolation transformer transmission centre tap pins respectively with described
One end of first resistance, described second resistance, described 3rd resistance and described 4th resistance connect and compose
One cabling；
The other end of described first resistance, described second resistance, described 3rd resistance and described 4th resistance with
The second cabling that one end of described high-voltage capacitance connects and composes；
The other end of described high-voltage capacitance and network interface with reference to the 3rd cabling that connects and composes；And
Four couple of the primary coil of described network isolation transformer receive centre tap pin respectively with described
The 4th cabling that four pairs of stitch of RJ45 connector connect and compose.
In above-mentioned port lightning preventing circuit, described second level circuit include the second electric capacity, the 3rd electric capacity, the 4th
Electric capacity and the 5th electric capacity, described second cabling group includes:
By the centre tap pin of the secondary coil of described network isolation transformer respectively with described second electric capacity,
The 5th cabling that one end of 3rd electric capacity, the 4th electric capacity and the 5th electric capacity connects and composes；And
Joined with system respectively by the other end of described second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity
The 6th cabling connecting and composing with examining.
In above-mentioned port lightning preventing circuit, the spacing at the two ends of described high-voltage capacitance is set to 60mil.
In above-mentioned port lightning preventing circuit, the first cabling of described first cabling group, the second cabling, the 3rd
When cabling and the 4th cabling are positioned at different routing layer, the spacing of the via between described different routing layers is set to
Cabling on 60mil, and adjacent traces layer is set to non-coincidence the intersection or non-parallel coincidence.
In above-mentioned port lightning preventing circuit, described port lightning preventing circuit also includes the magnetic bead class shielding
Device, the two ends of described magnetic bead class device respectively with described system reference and described network interface with reference to be connected.
In above-mentioned port lightning preventing circuit, described system reference ground and described network interface are set to reference to the spacing on ground
30mil, described network interface is disposed as with reference to the spacing on ground and described first cabling group and described second cabling group
30mil。
In above-mentioned port lightning preventing circuit, the stitch of described RJ45 connector and described first cabling group and described
The distance between centers of tracks of walking of the second cabling group is disposed as 60mil.
In above-mentioned port lightning preventing circuit, described first resistance, described second resistance, described 3rd resistance and
The resistance of described 4th resistance is 75 ohm.
In above-mentioned port lightning preventing circuit, described high-voltage capacitance is a patch capacitor, the envelope of described patch capacitor
Dress form is that the 1206th, capacitance is 1000pF and pressure voltage is 2kV.
The port lightning preventing circuit of the present invention, can pass through IEC61000-4-5 or GB17626.5 standard, reaches altogether
Mould 2kV and difference touch the interface lightning protection test request of the unmasked balanced signal of 1kV, in addition, according to test mark
Alignment request, for the balanced signal of unmasked, it is not required that mandatory carry out differential mode test, so for differential mode
Requirement of shelter within 1kV, can protect energy impact by transformer self winding, it is not necessary to increase
Differential mode protective device.In addition, the device that the port lightning preventing circuit of the present invention uses is less, taken up space, face
Long-pending little.
Brief description
Fig. 1 is the circuit diagram of the port lightning preventing circuit of the embodiment of the present invention.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only it should be appreciated that specific embodiment described herein
It in order to explain the present invention, is not intended to limit the present invention.
As it is shown in figure 1, be the circuit diagram of the port lightning preventing circuit of the embodiment of the present invention, this port lightning preventing circuit
It is arranged on PCB.This port lightning preventing circuit includes terminating at RJ45 connector and network isolation transformer U20
Between first order circuit and terminate at the second level between network isolation transformer U20 and network chip
Circuit, the transformer coil between network isolation transformer U20 and RJ45 connector is defined as primary coil,
Transformer coil between network isolation transformer U20 and network chip is defined as secondary coil.
First order circuit include the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 and
High-voltage capacitance C1, wherein, the annexation of first order circuit is: take out in the middle of four transmissions of primary coil
Head pin, i.e. stitch MCT1, MCT2, MCT3 and MCT4, respectively through the first resistance R1, second
Resistance R2, the 3rd resistance R3 and the 4th resistance R4 are connected with one end of high-voltage capacitance C1, high-voltage capacitance C1
The other end is connected with reference to ground with network interface, the first resistance R1, the second resistance R2, the 3rd resistance R3 and the 4th electricity
The resistance of resistance R4 is 75 ohm, and high-voltage capacitance C1 is a patch capacitor, and its packing forms is the 1206th, to hold
Value is 1000pF and pressure voltage is 2kV；Four couple of primary coil receives centre tap pin, i.e. stitch
MX4+, MX4-, MX3+, MX3-, MX2+, MX2-, MX1+, MX1-, respectively with RJ45
The four pairs of stitch of connector connect, i.e. stitch TX3+, TX3-, TX2+, TX2-, TX1+, TX1-,
TX0+ and TX0-.
Second level circuit includes the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th electric capacity C5,
Wherein, the annexation of second level circuit is: four centre tap stitch of secondary coil, i.e. stitch TCT1,
TCT2, TCT3 and TCT4, respectively through the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and
5th electric capacity C5 is connected with system reference ground.
In the present embodiment, this port lightning preventing circuit also includes a magnetic bead class device FB1, shields,
Its two ends respectively with system reference (GND) and network interface be connected with reference to ground (GND-LAN).
In the present embodiment, this port lightning preventing circuit is arranged on PCB, except walking of this port lightning preventing circuit
Line layout, this PCB also comprises the cabling of non-lightning protection circuit, for example, the cabling etc. of usb circuit.
It according to the annexation of above-mentioned first order circuit and second level circuit, is described below in the present embodiment
Cabling layout on PCB for the port lightning preventing circuit:
First order connection composition the first cabling group, second level connection composition the second cabling group, first
Cabling group is set to 60mil with the spacing of the cabling of non-lightning protection circuit, and wherein, the first cabling group includes first
Cabling, the second cabling, the 3rd cabling and the 4th cabling, four transmission centre tap pins of primary coil
MCT1, MCT2, MCT3 and MCT4 respectively with the first resistance R1, the second resistance R2, the 3rd resistance
One end of R3 and the 4th resistance R4 and one end of high-voltage capacitance C1 connect and compose the first cabling, high-voltage capacitance C1
The other end and network interface connect and compose the second cabling with reference to ground, four couples reception centre tap pin of primary coil
MX4+, MX4-, MX3+, MX3-, MX2+, MX2-, MX1+, MX1-are respectively with RJ45 even
Four couples of stitch TX3+, TX3-, TX2+, TX2-, TX1+, TX1-, TX0+, TX0-of joint are even
Connect composition the 4th cabling, when the first cabling, the second cabling, the 3rd cabling and the 4th cabling lay respectively at difference
During routing layer, the spacing of the via between routing layer is set to 60mil, and for example, the first cabling and second is walked
When line is positioned at different routing layer, the first cabling obtains via and the second cabling connects, or the tap of primary coil
Stitch obtains via and is connected with the first cabling and the second cabling respectively.Meanwhile, the cabling on adjacent traces layer is arranged
Intersect or non-parallel coincidence for non-coincidence, so that the distance between centers of tracks of walking of the first cabling group keeps 60mil.
Further, in order to reach to touch altogether 2kV, the spacing between two stitch of high-voltage capacitance C1 is
60mil, in conjunction with the capacitance of high-voltage capacitance C1, so when thunderbolt, high-voltage capacitance C1 inherently can bear 2kV
Thunderbolt, be further ensured that the validity of port lightning preventing.
In the present embodiment, the spacing between two stitch of magnetic bead class device FB1 is 30mil, due to magnetic bead
Two stitch of class device FB1 respectively with system reference and network interface with reference to be connected, therefore, system reference
Ground and network interface are 30mil with reference to the spacing between ground.
Second cabling group includes the 5th cabling and the 6th cabling, and wherein, four centre taps of secondary coil draw
Pin TCT1, TCT2, TCT3 and TCT4 respectively with the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity
One end of C4 and the 5th electric capacity C5 connects and composes the 5th cabling；And the second electric capacity C2, the 3rd electric capacity C3,
The other end of the 4th electric capacity C4 and the 5th electric capacity C5 respectively with the 6th cabling that connects and composes of system reference ground.
Lightning protection in order to reach differential mode 1kV requires, can protect energy punching by transformer self winding
Hit, it is not necessary to increase differential mode protective device, further, the stitch of RJ45 connector and the first cabling group and
The distance between centers of tracks of walking of the second cabling group is disposed as 60mil, and meanwhile, network interface is with reference to ground and the first cabling group and the
The spacing of two cabling groups is disposed as 30mil.
In test experiments, the port lightning preventing circuit of the present embodiment can pass through IEC61000-4-5 or
GB17626.5 standard, reaches common mode 2kV and the interface lightning protection test of the poor unmasked balanced signal touching 1kV is wanted
Ask.
Summary, the port lightning preventing circuit of the present invention, realize lightning protection by the cabling isolation layout on PCB
Require, be allowed to meet and meet the lightning protection of common mode 2kV and differential mode 1kV and require, simultaneously, it is not necessary to increase lightning protection
Device.In addition, the present invention port lightning preventing circuit use device less, taken up space, area little.
The above, the only present invention preferably detailed description of the invention, but protection scope of the present invention not office
Being limited to this, any those familiar with the art, can be easily in the technical scope that the invention discloses
The change expected or replacement, all should cover within protection scope of the present invention.Therefore, the protection of the present invention
Scope should be as the criterion with scope of the claims.
Claims (10)
1. a port lightning preventing circuit, is arranged on the PCB comprising non-lightning protection circuit, this port lightning preventing electricity
Road includes the first order circuit terminating between RJ45 connector and network isolation transformer and terminates at net
Second level circuit between network isolating transformer and network chip, described network isolation transformer and described RJ45
Transformer coil between connector is defined as primary coil, described network isolation transformer and described network core
Transformer coil between piece is defined as secondary coil, it is characterised in that described port lightning preventing circuit also includes
The the first cabling group being made up of first order connection and be made up of described second level connection second
Cabling group, wherein, the spacing of the cabling with the non-lightning protection circuit on described PCB for the described first cabling group is all provided with
It is set to 60mil.
2. the port lightning preventing circuit according to claim 1, it is characterised in that described first order circuit
Including the first resistance, the second resistance, the 3rd resistance, the 4th resistance and high-voltage capacitance, described first cabling group
Including:
By four of the primary coil of described network isolation transformer transmission centre tap pins respectively with described
One end of first resistance, described second resistance, described 3rd resistance and described 4th resistance connect and compose
One cabling；
The other end of described first resistance, described second resistance, described 3rd resistance and described 4th resistance with
The second cabling that one end of described high-voltage capacitance connects and composes；
The other end of described high-voltage capacitance and network interface with reference to the 3rd cabling that connects and composes；And
Four couple of the primary coil of described network isolation transformer receive centre tap pin respectively with described
The 4th cabling that four pairs of stitch of RJ45 connector connect and compose.
3. the port lightning preventing circuit according to claim 1, it is characterised in that described second level circuit
Including the second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity, described second cabling group includes:
By four centre tap pins of the secondary coil of described network isolation transformer respectively with described second
The 5th cabling that one end of electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity connects and composes；And
Joined with system respectively by the other end of described second electric capacity, the 3rd electric capacity, the 4th electric capacity and the 5th electric capacity
The 6th cabling connecting and composing with examining.
4. the port lightning preventing circuit according to claim 2, it is characterised in that described high-voltage capacitance
The spacing at two ends is set to 60mil.
5. the port lightning preventing circuit according to claim 2, it is characterised in that at described first cabling
When first cabling of group, the second cabling, the 3rd cabling and the 4th cabling are positioned at different routing layer, described difference
The cabling that the spacing of the via between routing layer is set on 60mil, and adjacent traces layer is set to non-coincidence
Intersect or non-parallel coincidence.
6. the port lightning preventing circuit according to Claims 2 or 3, it is characterised in that described network interface is prevented
Thunder and lightning road also includes the magnetic bead class device shielding, the two ends of described magnetic bead class device respectively with described
System reference ground and described network interface connect with reference to ground.
7. the port lightning preventing circuit according to claim 6, it is characterised in that described system reference ground
Be set to 30mil with described network interface with reference to the spacing on ground, described network interface with reference to ground and described first cabling group and
The spacing of described second cabling group is disposed as 30mil.
8. the port lightning preventing circuit according to claim 7, it is characterised in that described RJ45 connector
Stitch and described first cabling group and the distance between centers of tracks of walking of described second cabling group be disposed as 60mil.
9. according to Claim 8 described in port lightning preventing circuit, it is characterised in that described first resistance,
The resistance of described second resistance, described 3rd resistance and described 4th resistance is 75 ohm.
10. according to Claim 8 described in port lightning preventing circuit, it is characterised in that described high-voltage capacitance
Being a patch capacitor, the packing forms of described patch capacitor is that the 1206th, capacitance is 1000pF and pressure voltage is
2kV。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195566.9A CN106159921B (en) | 2015-04-23 | 2015-04-23 | A kind of port lightning preventing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510195566.9A CN106159921B (en) | 2015-04-23 | 2015-04-23 | A kind of port lightning preventing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106159921A true CN106159921A (en) | 2016-11-23 |
| CN106159921B CN106159921B (en) | 2019-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510195566.9A Expired - Fee Related CN106159921B (en) | 2015-04-23 | 2015-04-23 | A kind of port lightning preventing circuit |
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| Country | Link |
|---|---|
| CN (1) | CN106159921B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371565A (en) * | 2020-02-28 | 2020-07-03 | 怀化职业技术学院 | Computer security network connects |
| CN114597880A (en) * | 2022-03-04 | 2022-06-07 | 深圳市吉祥腾达科技有限公司 | Net mouth lightning protection system of floating equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2922307Y (en) * | 2006-07-12 | 2007-07-11 | 中兴通讯股份有限公司 | Ethernet interface isolating transformer central tap grounding circuit |
| CN101477883A (en) * | 2008-09-28 | 2009-07-08 | 福建星网锐捷网络有限公司 | Isolated transformer device, printed circuit board and manufacturing process thereof |
| CN101488666A (en) * | 2008-01-18 | 2009-07-22 | 研祥智能科技股份有限公司 | Network port lightning preventing circuit and RJ45 interface apparatus thereof |
| US20120176717A1 (en) * | 2011-01-06 | 2012-07-12 | Adomaitis Matthew | Category 6a surge protector |
-
2015
- 2015-04-23 CN CN201510195566.9A patent/CN106159921B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2922307Y (en) * | 2006-07-12 | 2007-07-11 | 中兴通讯股份有限公司 | Ethernet interface isolating transformer central tap grounding circuit |
| CN101488666A (en) * | 2008-01-18 | 2009-07-22 | 研祥智能科技股份有限公司 | Network port lightning preventing circuit and RJ45 interface apparatus thereof |
| CN101477883A (en) * | 2008-09-28 | 2009-07-08 | 福建星网锐捷网络有限公司 | Isolated transformer device, printed circuit board and manufacturing process thereof |
| US20120176717A1 (en) * | 2011-01-06 | 2012-07-12 | Adomaitis Matthew | Category 6a surge protector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111371565A (en) * | 2020-02-28 | 2020-07-03 | 怀化职业技术学院 | Computer security network connects |
| CN114597880A (en) * | 2022-03-04 | 2022-06-07 | 深圳市吉祥腾达科技有限公司 | Net mouth lightning protection system of floating equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106159921B (en) | 2019-06-07 |
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Granted publication date: 20190607 Termination date: 20200423 |