CN104977487A - 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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- CN104977487A CN104977487A CN201510352850.2A CN201510352850A CN104977487A CN 104977487 A CN104977487 A CN 104977487A CN 201510352850 A CN201510352850 A CN 201510352850A CN 104977487 A CN104977487 A CN 104977487A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 6
- 239000006260 foam Substances 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000005520 cutting process Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 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
- 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, a kind of particularly method reducing network interface Conduction Interference mean value.
Background technology
Electromagnetic interference (EMI) is a serious and ever-increasing environmental pollution form.Its little crack allowing people be sick of to producing during broadcast reception of impact, large to the vital control system collapse of safety, and then cause disastrous accident, heavy economic losses and great national security accident.And Conduction Interference is an important component part of electromagnetic interference (EMI), it is used for weighing electronic product and system from power port, signal port to the interference of electrical network or signal network transmission.At present, for server, signal port mainly refers to network interface.
The source of electromagnetic interference (EMI) can be divided into " intention signal " and " being not intended to signal " two kinds, and intention signal refers to natively should to exist have the working signal of certain rising and falling time.Be not intended to signal refer to by intention signal produce, be coupled to the signal in the place that should not occur.Obviously, cause the source of the noise of electromagnetic interference (EMI) to come from and be not intended to signal.
Being not intended to signal causes the reason of electromagnetic interference (EMI) to be: the return electric current of intention signal is not confined to be intended in reference planes narrow below signal, and most of return electric current can strive to find low impedance path on the reference plane and gets back to source.And this part return current spread to the ground pin of IO connector time, screening housing " will be fled from " along IO cable, cause interference.
The return electric current of common prevention diffusion, the method for effusion IO connector, mark together " trench " at IO area periphery exactly, term is referred to as " moat ".
Traditional high speed signal reference ground, IO region division methods, as shown in Figure 1.In order to become " being not intended to signal " with reference to the indiffusion immediately below high speed signal of return Current Control on the ground, the part of high-speed line in the connectors, is do not cut with reference to ground usually.And the return power frequency of low speed signal is low, even if because " moat " causes return current spread, be also unlikely to cause interference.But, in order to prevent unexpected appearance, need flying capcitor on moat, to give the unexpected return current supplying path of high speed occurred.
Traditional IO region high speed signal, with reference to ground division methods interference principle figure, as shown in Figure 2, has marked the conduction route direction of noise with dotted line in figure.External cable and working signal line, by transformer isolation, are that the noise of input end working signal line or output terminal External cable all cannot pass to the opposing party by signal wire like this.External cable and working signal line are connected electric capacity B and electric capacity C respectively, and electric capacity B and electric capacity C is connected to reference horizontal plane of manufacturing respectively by output end p in pin and input end pin pin.Reference horizontal plane of manufacturing has the noise in " being not intended to signal " source, and they can pass to input end working signal line and output terminal External cable along electric capacity C and electric capacity B.
Above-mentionedly being not intended to the problem that signal causes electromagnetic interference (EMI) for evading, the present invention proposes a kind of method reducing network interface Conduction Interference mean value.Divide convention to the IO region high speed signal reference broken traditions, utilizing the structure of connector, when there being high speed signal, still using cutoff signal with reference to ground, stop " being not intended to signal " interference source to the method for IO regional diffusion, reduce the mean value of network interface Conduction Interference test.
Summary of the invention
The present invention, in order to make up the defect of prior art, provides a kind of while the diffusion of cut-out undesired signal, can ensure the method for normal signal with reference to the reduction network interface Conduction Interference mean value of the integrality on ground.
The present invention is achieved through the following technical solutions:
Reduce a method for network interface Conduction Interference mean value, it is characterized in that: External cable and working signal line, by 1:1 transformer isolation, avoid the noise of input end working signal line and output terminal External cable to pass to the opposing party by signal wire; External cable and working signal line are connected electric capacity B and electric capacity C respectively, electric capacity C is connected to reference horizontal plane of manufacturing by input end pin pin, electric capacity B is connected to output end p in pin, output end p in pin is unsettled, the noise in reference horizontal plane of manufacturing " is not intended to signal " source, intelligence passes to input end working signal line along input end pin pin and electric capacity C, and cannot be transferred to output terminal External cable; Between connector with cabinet, Low ESR contacts well; When there is strong jamming in the external world, noise can import casing by output terminal External cable and connector shell, and can not interfere with internal circuit.
Move after described connector, make to flush outside connector with outside cabinet I/O port, or connector exceeds 1 ~ 4mm outside cabinet I/O port, to ensure that the pop-off of connector can realize the good contact with cabinet I/O port outside left.
Also post one deck conducting foam inside described cabinet I/O port, increase the thickness at cabinet I/O port place, be more conducive to the good contact of connector and cabinet.
The space of described unsettled output end p in pin and reference horizontal plane of manufacturing forms the anti-pad of 10mil ~ 30mil.
More excellent, described anti-pad is 30mil.
The invention has the beneficial effects as follows: the method for this reduction network interface Conduction Interference mean value, break traditional IO region high speed signal with reference to divide convention, utilize the structure of connector, when there being high speed signal, still use cutoff signal with reference to ground, stop " being not intended to signal " interference source to the method for IO regional diffusion, reduce the mean value of network interface Conduction Interference test; Utilize layout to carry out the isolation of signal reference horizontal plane of manufacturing dexterously, while the diffusion of cut-out undesired signal, ensure that the integrality of normal signal with reference to ground; After ensureing cutting, output end signal reference horizontal plane of manufacturing has enough ground levels to carry out releasing of external interference.
Accompanying drawing explanation
Accompanying drawing 1 is existing traditional high speed signal reference ground, IO region division methods schematic diagram;
Accompanying drawing 2 is traditional high speed signal reference ground, IO region division methods interference principle schematic diagram;
Accompanying drawing 3 is for IO region of the present invention high speed signal is with reference to ground division methods interference principle schematic diagram;
Accompanying drawing 4 is Low ESR connection diagram between connector of the present invention and cabinet.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
IO region as of the present invention in accompanying drawing 3 high speed signal with reference to shown in division methods interference principle schematic diagram, marked the conduction route direction of noise in figure with dotted line.The method of this reduction network interface Conduction Interference mean value, External cable and working signal line, by 1:1 transformer isolation, avoid the noise of input end working signal line and output terminal External cable to pass to the opposing party by signal wire; External cable and working signal line are connected electric capacity B and electric capacity C respectively, electric capacity C is connected to reference horizontal plane of manufacturing by input end pin pin, electric capacity B is connected to output end p in pin, output end p in pin is unsettled, the noise in reference horizontal plane of manufacturing " is not intended to signal " source, intelligence passes to input end working signal line along input end pin pin and electric capacity C, and cannot be transferred to output terminal External cable; Between connector with cabinet, Low ESR contacts well; When there is strong jamming in the external world, noise can import casing by output terminal External cable and connector shell, and can not interfere with internal circuit.
Move after described connector, make to flush outside connector with outside cabinet I/O port, or connector exceeds 1 ~ 4mm outside cabinet I/O port, to ensure that the pop-off of connector can realize the good contact with cabinet I/O port outside left.
Also post one deck conducting foam inside described cabinet I/O port, increase the thickness at cabinet I/O port place, be more conducive to the good contact of connector and cabinet.
The space of described unsettled output end p in pin and reference horizontal plane of manufacturing forms the anti-pad of 10mil ~ 30mil.
More excellent, described anti-pad is 30mil.
The method of this reduction network interface Conduction Interference mean value, network interface principle adopts output end p in pin unsettled; Mechanism strengthens the connection of connector shell and casing; In layout design, strengthen the size of output end signal with reference to ground hole anti-pad.The method of this reduction network interface Conduction Interference mean value, break traditional IO region high speed signal with reference to divide convention, utilize the structure of connector, when there being high speed signal, still use cutoff signal with reference to ground, stop " being not intended to signal " interference source to the method for IO regional diffusion, reduce the mean value of network interface Conduction Interference test; Utilize layout to carry out the isolation of signal reference horizontal plane of manufacturing dexterously, while the diffusion of cut-out undesired signal, ensure that the integrality of normal signal with reference to ground; After ensureing cutting, output end signal reference horizontal plane of manufacturing has enough ground levels to carry out releasing of external interference.
Claims (5)
1. reduce a method for network interface Conduction Interference mean value, it is characterized in that: External cable and working signal line, by 1:1 transformer isolation, avoid the noise of input end working signal line and output terminal External cable to pass to the opposing party by signal wire; External cable and working signal line are connected electric capacity B and electric capacity C respectively, electric capacity C is connected to reference horizontal plane of manufacturing by input end pin pin, electric capacity B is connected to output end p in pin, output end p in pin is unsettled, the noise in reference horizontal plane of manufacturing " is not intended to signal " source, intelligence passes to input end working signal line along input end pin pin and electric capacity C, and cannot be transferred to output terminal External cable; Between connector with cabinet, Low ESR contacts well; When there is strong jamming in the external world, noise can import casing by output terminal External cable and connector shell, and can not interfere with internal circuit.
2. the method for reduction network interface Conduction Interference mean value according to claim 1, it is characterized in that: move after described connector, make to flush outside connector with outside cabinet I/O port, or connector exceeds 1 ~ 4mm outside cabinet I/O port, to ensure that the pop-off of connector can realize the good contact with cabinet I/O port outside left.
3. the method for reduction network interface Conduction Interference mean value according to claim 2, is characterized in that: also post one deck conducting foam inside described cabinet I/O port, increase the thickness at cabinet I/O port place, be more conducive to the good contact of connector and cabinet.
4. the method for reduction network interface Conduction Interference mean value according to claim 1, is characterized in that: the space of described unsettled output end p in pin and reference horizontal plane of manufacturing forms the anti-pad of 10mil ~ 30mil.
5. the method for reduction network interface Conduction Interference mean value according to claim 4, it is characterized in that: more excellent, described anti-pad is 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 |
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| 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 true CN104977487A (en) | 2015-10-14 |
| CN104977487B CN104977487B (en) | 2017-10-13 |
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| CN201510352850.2A Active CN104977487B (en) | 2015-06-24 | 2015-06-24 | Method for reducing average value of network port conducted interference |
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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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| Publication number | Publication date |
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| CN104977487B (en) | 2017-10-13 |
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