CN104977487B - Method for reducing average value of network port conducted interference - Google Patents
Method for reducing average value of network port conducted interference Download PDFInfo
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- CN104977487B CN104977487B CN201510352850.2A CN201510352850A CN104977487B CN 104977487 B CN104977487 B CN 104977487B CN 201510352850 A CN201510352850 A CN 201510352850A CN 104977487 B CN104977487 B CN 104977487B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 238000002955 isolation Methods 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 claims description 4
- 239000006260 foam Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention particularly relates to a method for reducing the average value of network port conducted interference. The method for reducing the average value of the network port conducted interference is characterized in that a pin at the output end is suspended in the air in the network port principle; strengthening the connection between the connector shell and the case shell on the mechanism; in layout design, the size of an anti-pad of an output end signal reference ground hole is increased. The method for reducing the average value of the network port conducted interference breaks through the traditional convention of dividing the high-speed signal reference ground of the IO region, utilizes the structure of the connector, and still uses the cutting signal reference ground to prevent the method that the interference source of the 'non-intention signal' spreads to the IO region under the condition that the high-speed signal exists, thereby reducing the average value of the network port conducted interference test; the layout is skillfully utilized to isolate the signal reference ground plane, and the integrity of the normal signal reference ground is ensured while the interference signal diffusion is cut off; and after cutting, the reference ground plane of the output end signal has enough ground plane to discharge external interference.
Description
Technical field
The present invention relates to server technical field of electromagnetic compatibility measurement, specifically in conduction test, more particularly to
A kind of method for reducing network interface Conduction Interference average value.
Background technology
Electromagnetic interference（EMI）It is a serious and ever-increasing environmental pollution form.Its influence as low as broadcast reception
When the crack for allowing people to be sick of that produces, greatly to the vital control system collapse of safety, and then cause disastrous accident, it is great
Economic loss and great national security accident.And Conduction Interference is an important component of electromagnetic interference, it is used for weighing
The interference that integrated circuit and system is transmitted from power port, signal port to power network or signal network.At present, come for server
Say, signal port refers mainly to network interface.
The source of electromagnetic interference can be divided into two kinds of " signal of intent " and " being not intended to signal ", it is intended that signal, which refers to, natively should
The presence, there is the working signal of certain rising and falling time.It is not intended to signal and refers to what is produced by signal of intent, is coupled to not
The local signal that should occur.It will be apparent that causing the source of the noise of electromagnetic interference to come from is not intended to signal.
Being not intended to the reason for signal causes electromagnetic interference is：The return electric current of signal of intent is not limited to signal of intent
In the narrow reference planes in lower section, and most of return electric current can strive to find low impedance path on the reference plane and return to source
Head.And the return current spread in this part to I/O connector ground pin when, screening housing " will be fled from " along IO cables, is made
Into interference.
The return electric current of common prevention diffusion, the method for escaping I/O connector is exactly marked together in I/O area periphery
" trench ", term is referred to as " moat ".
Traditional I/O area high speed signal reference ground division methods, as shown in Figure 1.In order to the return electricity in reference ground
Flow control is in the underface of high speed signal without diffusing into " being not intended to signal ", and the usual part of high-speed line in the connectors is
Do not cut reference ground.And the return power frequency of low speed signal is low, even if because " moat " causes return current spread, also not
As for causing interference.But, in order to prevent drop-in, it is necessary on moat flying capcitor, so as to the high speed to drop-in
Return current supplying path.
Traditional I/O area high speed signal reference ground division methods interference principle figure, uses dotted line mark as shown in Figure 2, in figure
The conduction route direction of noise is gone out.External cable and working signal line are by transformer isolation, so either input work
Make the noise of signal wire or output end External cable all can not pass to the opposing party by signal wire.External cable and working signal
Line connects electric capacity B and electric capacity C respectively, and electric capacity B and electric capacity C are connected to reference by output end p in pin and input pin pin respectively
Ground level.The noise in " being not intended to signal " source is had on reference horizontal plane of manufacturing, they can pass to input along electric capacity C and electric capacity B
Hold working signal line and output end External cable.
For evade it is above-mentioned be not intended to the problem of signal causes electromagnetic interference, it is dry that the present invention proposes a kind of reduction network interface conduction
The method for disturbing average value.The I/O area high speed signal reference ground broken traditions divides convention, using the structure of connector, is there is height
In the case of fast signal, still using cutoff signal reference ground, to prevent " being not intended to signal " interference source from being spread to I/O area
Method, the average value of reduction network interface Conduction Interference test.
The content of the invention
The present invention, can in order to make up the defect of prior art there is provided one kind while interference signal diffusion is cut off
Ensure the method for the reduction network interface Conduction Interference average value of the integrality of normal signal reference ground.
The present invention is achieved through the following technical solutions：
A kind of method for reducing network interface Conduction Interference average value, it is characterised in that：External cable and working signal line pass through
1:1 transformer isolation, it is to avoid the noise of input working signal line and output end External cable passes to the opposing party by signal wire；
External cable and working signal line connect electric capacity B and electric capacity C respectively, and electric capacity C is connected to by input pin pin and refers to Horizon
Face, electric capacity B is connected to output end p in pin, and output end p in pin are hanging, the noise in the source that " is not intended to signal " on reference horizontal plane of manufacturing,
Intelligence passes to input working signal line along input pin pin and electric capacity C, and can not be transferred to output end External cable；Even
Low ESR between device and cabinet is connect to contact well；When there is strong jamming in the external world, noise can by output end External cable and
Connector shell imports casing, without interfering with internal circuit.
Moved after the connector, make connector outside and flushed on the outside of cabinet I/O port, or connector exceeds cabinet I/O port
1 ~ 4mm of outside, to ensure that the pop-off of connector can realize the good contact with cabinet I/O port outside left.
One layer of conducting foam is also posted on the inside of the cabinet I/O port, the thickness at cabinet I/O port, the company of being more beneficial for is increased
Connect the good contact of device and cabinet.
The space of the hanging output end p in pin and reference horizontal plane of manufacturing forms 10mil ~ 30mil anti-pad pads.
More excellent, the anti-pad pads are 30mil.
The beneficial effects of the invention are as follows：The method of the reduction network interface Conduction Interference average value, has broken traditional I/O area
High speed signal reference ground divides convention, using the structure of connector, in the case where there is high speed signal, still using cutoff signal
Reference ground, to prevent the method that " being not intended to signal " interference source spreads to I/O area, reduces the flat of network interface Conduction Interference test
Average；The isolation of signal reference horizontal plane of manufacturing is dexterously carried out using layout, while interference signal diffusion is cut off, it is ensured that
The integrality of normal signal reference ground；Ensure after cutting, it is external that output end signal reference horizontal plane of manufacturing there are enough ground levels to carry out
That disturbs releases.
Brief description of the drawings
Accompanying drawing 1 is existing traditional I/O area high speed signal reference ground division methods schematic diagram；
Accompanying drawing 2 is traditional I/O area high speed signal reference ground division methods interference principle schematic diagram；
Accompanying drawing 3 is present invention I O region high speed signal reference ground division methods interference principle schematic diagram；
Accompanying drawing 4 is Low ESR connection diagram between connector of the present invention and cabinet.
Embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
As shown in the present invention I O region high speed signal reference ground division methods interference principle schematic diagram of accompanying drawing 3, with void in figure
Line has marked the conduction route direction of noise.The method of the reduction network interface Conduction Interference average value, External cable and working signal
Line passes through 1:1 transformer isolation, it is to avoid the noise of input working signal line and output end External cable is passed to by signal wire
The opposing party；External cable and working signal line connect electric capacity B and electric capacity C respectively, and electric capacity C is connected to ginseng by input pin pin
Examine ground level, electric capacity B is connected to output end p in pin, output end p in pin are hanging, the source that " is not intended to signal " on reference horizontal plane of manufacturing
Noise, intelligence passes to input working signal line along input pin pin and electric capacity C, and can not be transferred to outside output end
Cable；Low ESR is contacted well between connector and cabinet；When there is strong jamming in the external world, noise can be by output end outside
Cable and connector shell import casing, without interfering with internal circuit.
Moved after the connector, make connector outside and flushed on the outside of cabinet I/O port, or connector exceeds cabinet I/O port
1 ~ 4mm of outside, to ensure that the pop-off of connector can realize the good contact with cabinet I/O port outside left.
One layer of conducting foam is also posted on the inside of the cabinet I/O port, the thickness at cabinet I/O port, the company of being more beneficial for is increased
Connect the good contact of device and cabinet.
The space of the hanging output end p in pin and reference horizontal plane of manufacturing forms 10mil ~ 30mil anti-pad pads.
More excellent, the anti-pad pads are 30mil.
The method of the reduction network interface Conduction Interference average value, it is hanging using output end p in pin in network interface principle；In mechanism
The upper connection for strengthening connector shell and casing；In layout designs, output end signal reference ground hole anti-is increased
Pad size.The method of the reduction network interface Conduction Interference average value, has broken traditional I/O area high speed signal reference ground and has divided
Convention, using the structure of connector, in the case where there is high speed signal, still using cutoff signal reference ground, to prevent " non-meaning
The method that figure signal " interference source spreads to I/O area, reduces the average value of network interface Conduction Interference test；Dexterously utilize
Layout carries out the isolation of signal reference horizontal plane of manufacturing, while interference signal diffusion is cut off, it is ensured that normal signal reference ground
Integrality；Ensure after cutting, output end signal reference horizontal plane of manufacturing there are enough ground levels to carry out releasing for external interference.
Claims (5)
1. a kind of method for reducing network interface Conduction Interference average value, it is characterised in that：External cable and working signal line pass through 1:1
Transformer isolation, it is to avoid the noise of input working signal line and output end External cable passes to the opposing party by signal wire；Outside
Portion's cable and working signal line connect electric capacity B and electric capacity C respectively, and electric capacity C is connected to reference horizontal plane of manufacturing by input pin pin,
Electric capacity B is connected to output end p in pin, and output end p in pin are hanging, the noise in the source that " is not intended to signal " on reference horizontal plane of manufacturing, intelligence
Input working signal line can be passed to along input pin pin and electric capacity C, and output end External cable can not be transferred to；Connection
Low ESR is contacted well between device and cabinet；When there is strong jamming in the external world, noise can pass through output end External cable and company
Connect device shell and import casing, without interfering with internal circuit.
2. the method for reduction network interface Conduction Interference average value according to claim 1, it is characterised in that：After the connector
Move, make connector outside and flushed on the outside of cabinet I/O port, or connector is beyond 1 ~ 4mm on the outside of cabinet I/O port, to ensure connection
The pop-off of device can realize the good contact with cabinet I/O port outside left.
3. the method for reduction network interface Conduction Interference average value according to claim 2, it is characterised in that：The cabinet I/O port
One layer of conducting foam is also posted in inner side, increases the thickness at cabinet I/O port, is more beneficial for the good contact of connector and cabinet.
4. the method for reduction network interface Conduction Interference average value according to claim 1, it is characterised in that：It is described hanging defeated
Go out to hold the space of pin pin and reference horizontal plane of manufacturing to form 10mil ~ 30mil anti-pad pads.
5. the method for reduction network interface Conduction Interference average value according to claim 4, it is characterised in that：More excellent, it is described
Anti-pad pads are 30mil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510352850.2A CN104977487B (en) | 2015-06-24 | 2015-06-24 | Method for reducing average value of network port conducted interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510352850.2A CN104977487B (en) | 2015-06-24 | 2015-06-24 | Method for reducing average value of network port conducted interference |
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| Publication Number | Publication Date |
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| CN104977487A CN104977487A (en) | 2015-10-14 |
| CN104977487B true CN104977487B (en) | 2017-10-13 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5223806A (en) * | 1991-08-23 | 1993-06-29 | Digital Equipment Corporation | Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces |
| CN201278411Y (en) * | 2008-08-13 | 2009-07-22 | 中兴通讯股份有限公司 | Ethernet connector with lightning protection function |
| CN202888525U (en) * | 2012-11-20 | 2013-04-17 | 东莞铭普光磁股份有限公司 | Improved structure of RJ 45 connector with transformer |
| CN203192580U (en) * | 2013-03-27 | 2013-09-11 | 江苏华辰变压器有限公司 | Oil-immersed transformer |
| CN103457252A (en) * | 2012-06-01 | 2013-12-18 | 富士康(昆山)电脑接插件有限公司 | Common-mode signal protective circuit and electric connector with same |
| CN103532814A (en) * | 2012-07-06 | 2014-01-22 | 乾坤科技股份有限公司 | Network communication device |
-
2015
- 2015-06-24 CN CN201510352850.2A patent/CN104977487B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5223806A (en) * | 1991-08-23 | 1993-06-29 | Digital Equipment Corporation | Method and apparatus for reducing electromagnetic interference and emission associated with computer network interfaces |
| CN201278411Y (en) * | 2008-08-13 | 2009-07-22 | 中兴通讯股份有限公司 | Ethernet connector with lightning protection function |
| CN103457252A (en) * | 2012-06-01 | 2013-12-18 | 富士康(昆山)电脑接插件有限公司 | Common-mode signal protective circuit and electric connector with same |
| CN103532814A (en) * | 2012-07-06 | 2014-01-22 | 乾坤科技股份有限公司 | Network communication device |
| CN202888525U (en) * | 2012-11-20 | 2013-04-17 | 东莞铭普光磁股份有限公司 | Improved structure of RJ 45 connector with transformer |
| CN203192580U (en) * | 2013-03-27 | 2013-09-11 | 江苏华辰变压器有限公司 | Oil-immersed transformer |
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| CN104977487A (en) | 2015-10-14 |
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