CN108966558B - Low-radiation installation structure of front cable of server - Google Patents
Low-radiation installation structure of front cable of server Download PDFInfo
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- CN108966558B CN108966558B CN201810965899.9A CN201810965899A CN108966558B CN 108966558 B CN108966558 B CN 108966558B CN 201810965899 A CN201810965899 A CN 201810965899A CN 108966558 B CN108966558 B CN 108966558B
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- 238000009434 installation Methods 0.000 title description 8
- 230000005855 radiation Effects 0.000 claims abstract description 41
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 18
- 239000007769 metal material Substances 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims abstract description 6
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052755 nonmetal Inorganic materials 0.000 claims description 8
- 239000003973 paint Substances 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000005670 electromagnetic radiation Effects 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000005507 spraying Methods 0.000 description 4
- 238000012938 design process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003796 beauty Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0217—Mechanical details of casings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/02—Details
- H05K5/0247—Electrical details of casings, e.g. terminals, passages for cables or wiring
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/002—Casings with localised screening
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0064—Earth or grounding circuit
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The application discloses low radiation mounting structure of leading cable of server, including the server box of metal material, leading casing is installed to server box one end, installs the port circuit board in the leading casing, and the port circuit board passes through the winding displacement and links to each other with the mainboard of installing on the box, and the winding displacement surface is provided with the cable shielding layer of parcel winding displacement, and the port circuit board passes through the cable shielding layer electricity with the server box and is connected. In the application, the port circuit board is electrically connected with the server box body through the cable shielding layer, so that differential mode current generated by the port circuit board in the front shell can flow back to the server box body, and then flows back to the ground through the server box body, radiation interference is avoided, and total radiation emission energy is reduced.
Description
Technical Field
The application belongs to the technical field of servers, and particularly relates to a low-radiation installation structure of a front cable of a server.
Background
In the field of servers, a VGA (Video Graphics Array) and USB (Universal Serial Bus) interface device is usually provided, and the VGA and USB interface can connect an external display device and a USB device to expand external functions.
The problem of electromagnetic radiation is always a relatively troublesome problem in the field of servers, and a common method is that a chassis is made into a shielding body and plastic parts are not needed as much as possible. However, the overall appearance design of the product is affected by the use of all metal parts, and the cost is high, therefore, a plastic part is generally adopted to manufacture the front casing, then, as the main board in the server is connected with the port circuit board by the flat cable, the flat cable generates high radiation due to a long radiation path, a complete shielding body is required to shield the radiation source, but in order to ensure the cost and the appearance requirement of the server, the front casing must be made into the plastic part, so that only the test limit value can be increased, the overall design requirement is relaxed, the radiation test limit value of the server is generally widened to a level in the industry, the test limit value commonly used by daily-used electronic products is a level B, and the overall radiation emission energy can be increased by doing so.
Therefore, how to reduce the total radiated emission energy when using a non-metallic front housing is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of this, the present application provides a low radiation mounting structure for a front cable of a server, in which the port circuit board is electrically connected to the server box through the cable shielding layer, so that it is ensured that a differential mode current generated by the port circuit board in the front housing can flow back to the server box, and then flow back to the ground through the server box, thereby avoiding radiation interference and reducing total radiation emission energy.
The application provides a low radiation mounting structure of leading cable of server, server box including the metal material, nonmetal leading casing is installed to server box one end, install the port circuit board in the leading casing, the port circuit board passes through the winding displacement and installs mainboard on the box links to each other, the winding displacement surface is provided with the parcel the cable shielding layer of winding displacement, the port circuit board with the server box passes through the cable shielding layer electricity is connected.
Preferably, a conductive layer is arranged inside the front casing.
Preferably, the conductive layer comprises a silver copper conductive paint layer.
Preferably, the port circuit board is in contact with the silver-copper conductive paint layer, and the cable shielding layer is in contact with the silver-copper conductive paint layer.
Preferably, the cable shielding layer comprises a conductive cloth.
Preferably, the device further comprises a filtering device, and the filtering device is mounted on the port circuit board.
To sum up, the application discloses low radiation mounting structure of leading cable of server, server box including the metal material, leading casing is installed to server box one end, install the port circuit board in the leading casing, the port circuit board passes through the winding displacement and installs mainboard on the box links to each other, the winding displacement surface is provided with the parcel the cable shielding layer of winding displacement, the port circuit board with the server box passes through the cable shielding layer electricity is connected. In the application, the port circuit board and the server box body are electrically connected through the cable shielding layer, so that differential mode current generated by the port circuit board in the front shell can flow back to the server box body, and then flows back to the ground through the server box body, radiation interference is avoided, and total radiation emission energy is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cable structure diagram of an embodiment 1 of a low-radiation installation structure of a front cable of a server according to an embodiment of the present application;
fig. 2 is a schematic cable structure diagram of an embodiment 2 of a low-radiation installation structure of a front cable of a server according to an embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a housing of a low-radiation installation structure of a front cable of a server according to the present disclosure;
FIG. 4 is a prior art radiation data plot of a server front cable;
FIG. 5 is a radiation data diagram of a low radiation mounting structure for a front cable of a server according to the present disclosure;
description of reference numerals: the cable comprises a front shell 1, a flat cable mounting position 2, a mainboard mounting position 3, a cable shielding layer 4 and a conducting layer 5.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, a wiring structure diagram of embodiment 1 of a low radiation mounting structure of a front cable of a server is disclosed in the embodiment of the present application, the present application provides a low radiation mounting structure of a front cable of a server, the server box comprises a metal material, a non-metal front casing is mounted at one end of the server box, a port circuit board is mounted in the front casing (the port circuit board comprises a USB port circuit board and a VGA port circuit board), the port circuit board is connected with a main board mounted on the box through a wiring, a cable shielding layer (the cable shielding layer comprises a conductive cloth) wrapping the wiring is arranged on the outer surface of the wiring, and the port circuit board is electrically connected with the server box through the cable shielding layer.
A problem of radiation emission occurs, requiring three conditions to be met simultaneously: an interference source, a circuit or a device that generates electromagnetic disturbance; a coupling path capable of transferring interference energy generated by the interference source to a path of the sensitive source; a sensitive source, a circuit or a device affected by such interference. The above three conditions are called three elements of radiation interference, and as long as one of the three elements is eliminated, the problem of electromagnetic interference no longer exists. Thus, electromagnetic interference techniques are developed around these three elements. In the process of electromagnetic compatibility design, the characteristics of each element need to be researched, and a technical method for eliminating each element is provided.
As shown in fig. 3, in the design process of the server, a design in which a port on the motherboard is connected to a front port by a cable is generally used. The front shell is usually made of non-metal materials in order to meet the requirements of appearance and cost, and can be made of plastics. The flat cable generates high radiation due to a long radiation path, a complete shielding body is needed to shield a radiation source, but in order to ensure the cost and the appearance requirement of the server, the front shell is also required to be made into a plastic part, so the design of the front shell is always the weak point of the electromagnetic compatibility experiment in the industry.
Therefore, in the application, the cable shielding layer wrapping the flat cable is arranged on the outer surface of the flat cable, and the port circuit board is electrically connected with the server box body through the cable shielding layer, so that differential mode current generated by the port circuit board in the front shell can flow back to the server box body, and then flows back to the ground through the server box body, radiation interference is avoided, and total radiation emission energy is reduced.
In embodiment 1, in order to ensure that the port circuit board is electrically connected to the server box through the cable shielding layer, the cable shielding layer may completely wrap the end of the flat cable connected to the front housing, and the cable shielding layer is in contact with the box and the port circuit board, respectively.
Fig. 2 is a schematic view of a cable arrangement structure of embodiment 2 of a low-radiation installation structure of a front cable of a server according to an embodiment of the present application. The application provides a low radiation mounting structure of leading cable of server, including the server box of metal material, nonmetal leading casing is installed to server box one end, installs the port circuit board in the leading casing, and the port circuit board passes through the winding displacement and links to each other with the mainboard of installing on the box, and the winding displacement surface is provided with the cable shielding layer of parcel winding displacement, and the port circuit board passes through the cable shielding layer electricity with the server box and is connected. And a conductive layer is arranged on the inner side of the front shell.
Due to the consideration of cost and beauty, the front casing of the server case is made of non-metal materials, but the non-metal materials do not have any shielding effectiveness on electromagnetic waves, and radiation emission is often out of limits.
In embodiment 1, the cable shielding layer is disposed on the outer surface of the flat cable, and the port circuit board is electrically connected to the server box through the cable shielding layer, so that it is ensured that differential mode current generated by the port circuit board in the front housing flows back to the server box, and then flows back to the ground through the server box, thereby avoiding radiation interference and reducing total radiation emission energy. The difference between embodiment 2 and embodiment 1 is that a conductive layer is also arranged inside the front housing, and a silver-copper conductive paint layer can be used as the conductive layer.
In the design of the conductive layer of the front shell of the server, silver-copper conductive paint can be adopted for conducting spraying treatment, the coating of the conducting spraying is generally very thin, and the shielding effectiveness of the conducting spraying mainly depends on reflection loss. Such shields are in the near field, while the wave resistance of the electromagnetic waves in the near field region depends on the radiation source. The mode of conductive spraying is added in the front shell, so that the purpose of protecting the electromagnetic radiation of the circuit board in the front shell is achieved, and the radiation energy is further reduced.
In addition, in order to further optimize the scheme, the port circuit board is in contact with the silver-copper conductive paint layer, and the cable shielding layer is in contact with the conductive layer.
In the design process of the shielding cable, the connection mode of the cable shielding layer and the metal box body is very important for the shielding effect. If one of the connection points is not a good 360 low impedance connection (the 360 low impedance connection is a complete connection between the cable shield and the housing, and no disconnection is allowed), current will flow through the impedance of the shield connection, which will cause a common mode voltage at the bad connection point, causing radiated interference.
However, in the existing structure, the package of the cable shielding layer on the flat cable is difficult to be performed on the root of the flat cable (the root refers to the position where the flat cable is connected with the port circuit board), so that the contact between the cable shielding layer and the port circuit board is difficult to be ensured, and the port circuit board is electrically connected with the server box body through the cable shielding layer. Therefore, in this application, set up the conducting layer in leading casing, the cable shield contacts with the conducting layer, and the conducting layer also contacts with the port circuit board to guarantee more easily that port circuit board and server box pass through the cable shield and be connected, guarantee to reduce the effect of radiation.
The application also discloses an embodiment 3 of the low-radiation installation structure of the front cable of the server.
The embodiment provides a low radiation mounting structure of leading cable of server, server box including metal material, nonmetal leading casing is installed to server box one end, install the port circuit board in the leading casing (the port circuit board is including USB port circuit board and VGA port circuit board), the port circuit board passes through the winding displacement and links to each other with the mainboard of installing on the box, the winding displacement surface is provided with the cable shielding layer (the cable shielding layer includes electrically conductive cloth) of parcel winding displacement, the port circuit board passes through the cable shielding layer electricity with the server box and is connected. In addition, the filter device is also included and is arranged on the port circuit board.
In the electromagnetic radiation protection process of the front shell, the placement positions of the filters of the USB and the VGA are also a key point of design, wherein the electromagnetic radiation of the USB is mainly protected through a 90 omega common mode inductor, the VGA is mainly protected through a filter circuit, and most people consider that the filters can be placed at any place or the space on a mainboard is large.
Therefore, it is customary to place the filter device at the main board end, but placing the filter device at the front small board will greatly improve the radiation emission result of the front housing, reducing the radiation emission level at the source end of the device.
As shown in fig. 4 and 5, by adopting the mounting structure provided by the invention, the electromagnetic radiation of the whole machine is 30MHz-200MHz, and the radiation emission signal is obviously reduced by more than 15db basically, so that in the design process of the server, the purpose of reducing the radiation emission can be achieved through the good circuit and structure design.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The utility model provides a low radiation mounting structure of leading cable of server, includes the server box of metal material, nonmetal leading casing is installed to server box one end, install the port circuit board in the leading casing, the port circuit board pass through the winding displacement and install mainboard on the box links to each other, a serial communication port, the winding displacement surface is provided with the parcel the cable shield of winding displacement, the port circuit board with the server box passes through the cable shield electricity is connected, wherein, leading casing inboard is provided with the conducting layer, the conducting layer includes silver-copper conductive paint layer, the port circuit board with silver-copper conductive paint layer contacts, the cable shield with the conducting layer contacts.
2. The low-emissivity mounting structure of a server front cable of claim 1, wherein the cable shielding layer comprises a conductive cloth.
3. The low radiation mounting structure of the server front cable of claim 1, further comprising a filtering device mounted on said port circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810965899.9A CN108966558B (en) | 2018-08-23 | 2018-08-23 | Low-radiation installation structure of front cable of server |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810965899.9A CN108966558B (en) | 2018-08-23 | 2018-08-23 | Low-radiation installation structure of front cable of server |
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| Publication Number | Publication Date |
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| CN108966558A CN108966558A (en) | 2018-12-07 |
| CN108966558B true CN108966558B (en) | 2020-09-18 |
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| CN201810965899.9A Active CN108966558B (en) | 2018-08-23 | 2018-08-23 | Low-radiation installation structure of front cable of server |
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| CN108966558A (en) | 2018-12-07 |
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Effective date of registration: 20200821 Address after: 215100 No. 1 Guanpu Road, Guoxiang Street, Wuzhong Economic Development Zone, Suzhou City, Jiangsu Province Applicant after: SUZHOU LANGCHAO INTELLIGENT TECHNOLOGY Co.,Ltd. Address before: 450018 Henan province Zheng Dong New District of Zhengzhou City Xinyi Road No. 278 16 floor room 1601 Applicant before: ZHENGZHOU YUNHAI INFORMATION TECHNOLOGY Co.,Ltd. |
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