CN211087113U - Server capable of reducing electromagnetic interference - Google Patents
Server capable of reducing electromagnetic interference Download PDFInfo
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- CN211087113U CN211087113U CN201922243984.7U CN201922243984U CN211087113U CN 211087113 U CN211087113 U CN 211087113U CN 201922243984 U CN201922243984 U CN 201922243984U CN 211087113 U CN211087113 U CN 211087113U
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- 208000025274 Lightning injury Diseases 0.000 description 5
- 239000006260 foam Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005670 electromagnetic radiation Effects 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
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Abstract
The utility model provides a reduce electromagnetic interference's server, include: a case, a motherboard cover sheet and a motherboard; the main board is arranged inside the case and connected with the bottom plate of the case; the mainboard shielding sheet is arranged at the bottom of the mainboard, so that the bottom of the mainboard is isolated from the inner wall of the bottom plate of the case; the side wall of the case is connected with a folded plate which is arranged on the upper part of the main board; the folded plate, the side wall of the case and the bottom plate of the case enclose a U-shaped groove; the side edge of the mainboard is provided with a mainboard elastic sheet which is electrically connected with the grounding end of the mainboard, and the mainboard elastic sheet is clamped in the U-shaped groove; the mainboard shrapnel is connected with the grounding end of the case through the U-shaped groove. By adding the U-shaped groove in the server case, the grounding connection between the case and the mainboard connector is increased, and the electromagnetic compatibility of the server is ensured.
Description
Technical Field
The utility model relates to a reduce electromagnetism to server interference's technical field, especially relate to a reduce electromagnetic interference's server.
Background
Electromagnetic disturbance is a serious and growing form of environmental pollution, and the influence is as little as annoying crackling sound generated during broadcast reception and as much as life accidents caused by interference of a control system. The radiation disturbance is the most important disturbance form in electromagnetic disturbance, and electromagnetic energy is directly radiated outwards in the form of electromagnetic waves, so that injury and disturbance are caused to human bodies and other equipment.
The design of the ground of an electronic system is an important aspect of electromagnetic compatibility design. Many electromagnetic compatibility problems are due to improper grounding designs. If the system ground design is not fully considered in the early stage of the design stage, many electromagnetic compatibility problems tend to occur in the later stage of the design stage, and the electromagnetic compatibility problems are very difficult to solve.
When a product is subjected to system electromagnetic compatibility design, the system grounding design is not fully considered in the early stage of design, and when the product has an electromagnetic compatibility problem, an electromagnetic compatibility protection circuit is added on a circuit board or a test limit value is reduced by negotiation with a customer to solve the electromagnetic compatibility problem.
It is often ignored that considering good layout and grounding designs at the beginning of the design is the least expensive and effective way to solve the problem of electromagnetic compatibility.
When the mainboard of the server is installed in the chassis at present, the mainboard and the chassis of the server need to be well lapped, wherein the addition of the conductive foam between the mainboard and the chassis of the server is a common design method, and most of connectors with complete planes can enable the mainboard and the chassis to be well lapped by the addition of the conductive foam. Such as VGA connectors, serial connectors.
However, since the connector having the EMI spring is overlapped with the chassis through the spring, even if the conductive foam is added, the EMI spring cannot be in good contact even if it is overlapped because the conductive foam has a compression amount of 40% to 60%, so that the efficiency of electromagnetic radiation and electrostatic discharge is greatly reduced due to a small grounding manner. Therefore, in the design of electromagnetic compatibility, the problem that some interfaces are easy to generate electromagnetic compatibility even if an EMI elastic sheet exists is solved.
Disclosure of Invention
In order to overcome the not enough among the above-mentioned prior art, the utility model provides a reduce electromagnetic interference's server, include: a case, a motherboard cover sheet and a motherboard;
the main board is arranged inside the case and connected with the bottom plate of the case;
the mainboard shielding sheet is arranged at the bottom of the mainboard, so that the bottom of the mainboard is isolated from the inner wall of the bottom plate of the case;
the side wall of the case is connected with a folded plate which is arranged on the upper part of the main board;
the folded plate, the side wall of the case and the bottom plate of the case enclose a U-shaped groove;
the side edge of the mainboard is provided with a mainboard elastic sheet which is electrically connected with the grounding end of the mainboard, and the mainboard elastic sheet is clamped in the U-shaped groove;
the mainboard shrapnel is connected with the grounding end of the case through the U-shaped groove.
Preferably, the side part of the main board shielding piece is provided with a U-shaped piece body;
the U-shaped sheet body is arranged in the U-shaped groove and is connected with the U-shaped groove through a bolt;
the main board elastic sheet is clamped in the U-shaped sheet body.
Preferably, the main board elastic sheet is provided with a support plate, and two ends of the support plate are respectively elastically connected with the elastic sheet;
the two elastic sheets are opened towards the two sides of the supporting plate;
the supporting plate is fixedly connected with the side part of the main plate.
Preferably, the width of the support plate is adapted to the width of the bottom of the U-shaped groove.
Preferably, one side edge of the main board is clamped in the U-shaped groove through a main board elastic sheet;
the other side edge of the main board is fixedly arranged on the bottom plate of the machine box through a connecting bolt.
Preferably, a U-shaped sheet body is arranged at one side part of the main board shielding sheet and is connected with the U-shaped groove through the U-shaped sheet body and a bolt;
the other side part of the mainboard shield is fixedly arranged on the bottom plate of the machine box through a shield bolt.
Preferably, the side walls of the cabinet are provided with ground connection terminals.
According to the technical scheme, the utility model has the advantages of it is following:
the utility model discloses a mode in server machine case increase U-shaped groove increases the ground connection of quick-witted case and mainboard connector and is connected, guarantees server electromagnetic compatibility ability. The mode that increases the U-shaped lamellar body at the mainboard matte increases the mainboard and is connected with the ground connection of mainboard matte, installs the mainboard again on quick-witted case, and the U-shaped lamellar body sets up at the U-shaped inslot, strengthens the electromagnetic compatibility performance of server. Through a good grounding design, the static electricity, radiation and lightning stroke performance of the server is improved. The server was placed in an electromagnetic compatibility laboratory for testing.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a server architecture for reducing EMI;
FIG. 2 is a schematic diagram of an embodiment of a server for reducing electromagnetic interference;
fig. 3 is a schematic diagram of a motherboard elastic sheet.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the following embodiments and drawings are applied to clearly and completely describe the technical solution protected by the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, not all 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 scope of protection of this patent.
It will be understood that when an element or layer is referred to as being "on," connected to, "or" coupled to "another element or layer, it can be directly on, connected or coupled to the other element or layer, and intervening elements or layers may also be present. In contrast, when an element is referred to as being "directly on," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. Like numbers refer to like elements throughout. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Spatially relative terms such as "under …", "below", "lower", "above", "over", and the like, as may be used herein for ease of description, describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.
The utility model discloses an eliminate the common mode current of cable, a method is for common mode current provides an easier route, makes common mode current change the route. Therefore, the signal ground of the circuit board needs to be well lapped with the ground of the server chassis 1, and the common mode current does not flow into the cable, so that the electromagnetic radiation of the cable can be eliminated.
Specifically, a server for reducing electromagnetic interference is provided, as shown in fig. 1 to 3, including: the computer case comprises a case 1, a mainboard shielding sheet 2 and a mainboard 3;
the mainboard 3 is arranged inside the case 1, and the mainboard 3 is connected with the bottom plate of the case 1; the mainboard shading sheet 2 is arranged at the bottom of the mainboard, so that the bottom of the mainboard is isolated from the inner wall of the bottom plate of the case 1; the side wall of the case 1 is connected with a folded plate 4, and the folded plate 4 is arranged at the upper part of the main board; the folded plate 4, the side wall of the case 1 and the bottom plate of the case 1 enclose a U-shaped groove 6; the side edge of the mainboard is provided with a mainboard elastic sheet 5 which is electrically connected with the grounding end of the mainboard, and the mainboard elastic sheet 5 is clamped in the U-shaped groove 6; the mainboard shrapnel 5 is connected with the grounding end of the case 1 through the U-shaped groove 6.
The U-shaped groove 6 increases a contact area with the main board, and a discharge current flows through the ground line when the electrostatic discharge is performed. Since the esd current has a high frequency, a high ground voltage is generated if the ground exhibits a large impedance. Thereby lead to the electrostatic discharge test not to pass through, in utility model's structure, through setting up 5 blocks of mainboard shell fragment in U-shaped groove 6, mainboard shell fragment 5 can be inseparable with quick-witted case 1 contact to guarantee the product electrostatic discharge performance. When lightning stroke leakage current flows through the ground wire, a very high voltage can be generated, so that interference is generated on a circuit, and a U-shaped groove 6 is additionally arranged, so that good leakage of a product lightning stroke signal is guaranteed, and the lightning stroke performance of the product is guaranteed.
Further, a U-shaped sheet body is arranged at the side part of the main board shielding sheet 2; the U-shaped sheet body is arranged in the U-shaped groove 6 and is connected with the U-shaped groove 6 through a bolt; the main board elastic sheet 5 is clamped in the U-shaped sheet body. The motherboard shielding sheet 2 is a motherboard metal shielding sheet.
The utility model discloses carried out further improvement to 1 overlap joint mode of quick-witted case, mainboard metal matte mainly has the effect in two aspects: one aspect is to increase the structural strength of the main panel. On the other hand, the foreign matter is prevented from touching the circuit below, so that the circuit is prevented from being short-circuited. Set server mainboard matte 2 into the U-shaped lamellar body, at first carry out the overlap joint with server mainboard and mainboard matte 2 through the screw, the U-shaped lamellar body on the mainboard matte 2 contacts with mainboard shell fragment 5 to just guaranteed the low impedance overlap joint of mainboard and ground before quick-witted case 1 is installed to the mainboard, install the mainboard back in quick-witted case 1, can contact through a plurality of bullet points between the U-shaped lamellar body and the quick-witted case 1U-shaped groove 6.
By the mode, the low-impedance lap joint of the main board connector GND and the server case 1 is ensured, and when factors such as grounding common impedance, antenna effect of a transmission line or a metal shell and the like are generated, the low impedance correspondingly generates smaller common-mode interference voltage, so that loop interference passing through the ground is further reduced, and the electromagnetic compatibility of the product is ensured.
In the electromagnetic compatibility design, the grounding design of a circuit or a system is as important as the functional design, and the reasonable grounding design is the most economic and effective electromagnetic compatibility design technology. The 90% electromagnetic compatibility problem is due to improper wiring or grounding. Good wiring and grounding can reduce interference emission and improve the immunity. By means of the U-shaped groove 6 and the U-shaped sheet body on the edge of the case 1, a plurality of electromagnetic interference problems are solved under the condition that the cost is not increased basically. Considering a good ground design at the beginning of the design is the cheapest and effective way to solve the problem of electromagnetic compatibility.
In the utility model, the main board spring 5 is provided with a support plate 11, and both ends of the support plate 11 are respectively elastically connected with a spring 12; the two elastic sheets 12 are opened towards the two sides of the supporting plate; the supporting plate is fixedly connected with the side part of the main plate. The width of the supporting plate is matched with the width of the bottom of the U-shaped groove 6.
One side edge of the main board is clamped in the U-shaped groove 6 through a main board elastic sheet 5; the other side of the main board is fixedly arranged on the bottom plate of the case 1 through a connecting bolt. A U-shaped sheet body is arranged at one side part of the mainboard shielding sheet 2 and is connected with the U-shaped groove 6 through the U-shaped sheet body and a bolt; the other side part of the mainboard shield 2 is fixedly arranged on the bottom plate of the case 1 through a shield bolt. This realizes the connection between the main board and the chassis 1.
The utility model discloses an eliminate the common mode current of cable, get up mainboard and the good overlap joint of server machine case 1 ground, at this moment the common mode current can not flow in the cable to can eliminate the electromagnetic radiation of cable.
By adding the U-shaped groove 6 in the server case 1, the grounding connection between the case 1 and a mainboard connector is increased, and the electromagnetic compatibility of the server is ensured.
The mode that increases the U-shaped lamellar body at mainboard matte 2 increases the mainboard and is connected with the ground connection of mainboard matte 2, installs the mainboard again on quick-witted case 1, and the U-shaped lamellar body sets up in U-shaped groove 6, strengthens the electromagnetic compatibility performance of server. Through a good grounding design, the static electricity, radiation and lightning stroke performance of the server is improved. The server was placed in an electromagnetic compatibility laboratory for testing.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 (7)
1. A server for reducing electromagnetic interference, comprising: a case, a motherboard cover sheet and a motherboard;
the main board is arranged inside the case and connected with the bottom plate of the case;
the mainboard shielding sheet is arranged at the bottom of the mainboard, so that the bottom of the mainboard is isolated from the inner wall of the bottom plate of the case;
the side wall of the case is connected with a folded plate which is arranged on the upper part of the main board;
the folded plate, the side wall of the case and the bottom plate of the case enclose a U-shaped groove;
the side edge of the mainboard is provided with a mainboard elastic sheet which is electrically connected with the grounding end of the mainboard, and the mainboard elastic sheet is clamped in the U-shaped groove;
the mainboard shrapnel is connected with the grounding end of the case through the U-shaped groove.
2. The server for reducing electromagnetic interference of claim 1,
the side part of the mainboard shielding sheet is provided with a U-shaped sheet body;
the U-shaped sheet body is arranged in the U-shaped groove and is connected with the U-shaped groove through a bolt;
the main board elastic sheet is clamped in the U-shaped sheet body.
3. The server for reducing electromagnetic interference according to claim 1 or 2,
the main board elastic sheet is provided with a support plate, and two ends of the support plate are respectively elastically connected with an elastic sheet;
the two elastic sheets are opened towards the two sides of the supporting plate;
the supporting plate is fixedly connected with the side part of the main plate.
4. The EMI reduced server of claim 3,
the width of the supporting plate is matched with the width of the bottom of the U-shaped groove.
5. The server for reducing electromagnetic interference according to claim 1 or 2,
one side edge of the main board is clamped in the U-shaped groove through a main board elastic sheet;
the other side edge of the main board is fixedly arranged on the bottom plate of the machine box through a connecting bolt.
6. The EMI reduced server of claim 2,
one side part of the mainboard shielding sheet is provided with a U-shaped sheet body which is connected with the U-shaped groove through the U-shaped sheet body and a bolt;
the other side part of the mainboard shield is fixedly arranged on the bottom plate of the machine box through a shield bolt.
7. The server for reducing electromagnetic interference according to claim 1 or 2,
the side wall of the case is provided with a grounding connecting end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922243984.7U CN211087113U (en) | 2019-12-13 | 2019-12-13 | Server capable of reducing electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922243984.7U CN211087113U (en) | 2019-12-13 | 2019-12-13 | Server capable of reducing electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211087113U true CN211087113U (en) | 2020-07-24 |
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ID=71645765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922243984.7U Active CN211087113U (en) | 2019-12-13 | 2019-12-13 | Server capable of reducing electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211087113U (en) |
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2019
- 2019-12-13 CN CN201922243984.7U patent/CN211087113U/en active Active
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