WO2021068375A1

WO2021068375A1 - Electromagnetic compatibility circuit having double-layer network port, and server

Info

Publication number: WO2021068375A1
Application number: PCT/CN2019/121103
Authority: WO
Inventors: 田立良
Original assignee: 广东浪潮大数据研究有限公司
Priority date: 2019-10-12
Filing date: 2019-11-27
Publication date: 2021-04-15
Also published as: CN110795379A

Abstract

An electromagnetic compatibility circuit with a double-layer network port, and a server having a compatibility circuit with a double-layer network port. Two network ports on a server mainboard are designed with the same structure, facilitating batch production, but each network port only contains a network port body used for signal transmission. In order to make the network port easier to manufacture, an electromagnetic compatibility protective component is provided outside the network port body rather than being integrated into the inside of the network port body, and an electromagnetic compatibility protective component may be separately provided to the outside of the network port body as a network management port, thereby not only satisfying electromagnetic compatibility index requirements of the network management port, but also omitting a set of electromagnetic compatibility preventive components, and saving the cost.

Description

Double-layer network port electromagnetic compatibility circuit and server

This application claims the priority of the Chinese patent application filed to the Chinese Patent Office on October 12, 2019, with the application number 201910969432.6 and the invention title "A double-layer network port electromagnetic compatibility circuit and server", the entire content of which is incorporated by reference Incorporated in this application.

Technical field

The invention relates to the field of servers, in particular to a double-layer network port electromagnetic compatibility circuit and a server.

Background technique

At present, the server motherboard is usually provided with two upper and lower network ports, called double-layer network ports, one network port is used as a management network port, and the other network port is used as a serial port or a debugging (debug) port. In order to facilitate mass production, the two network ports adopt the same structural design, that is, each network port contains a network port body for signal transmission and an electromagnetic compatibility protection device integrated in the network port body. However, based on the electromagnetic compatibility index requirements of the management network port and the serial port (or debugging port), it is known that there is a need for integrated electromagnetic compatibility protection devices inside the management network port, while the serial port (or debugging port) does not have an integrated electromagnetic compatibility protection device. As a result of the demand, the electromagnetic compatibility protection device integrated inside the network port as the serial port (or debugging port) is redundantly set up, and the cost is wasted.

Therefore, how to provide a solution to the above-mentioned technical problems is a problem that needs to be solved by those skilled in the art at present.

Summary of the invention

The purpose of the present invention is to provide a double-layer network port electromagnetic compatibility circuit and server, which can separately add electromagnetic compatibility protection devices to the network port body as the management network port, so as not only to meet the electromagnetic compatibility index requirements of the management network port, but also It also saves a set of electromagnetic compatibility protection devices and saves costs.

In order to solve the above technical problems, the present invention provides a double-layer network port electromagnetic compatibility circuit, including:

The first network port body set on the server motherboard;

A second network port body with the same structure as the first network port body, which is provided on the server motherboard;

An electromagnetic compatibility protection device arranged on the connection line between the first network port body and the server main board and used to meet the electromagnetic compatibility index requirements of the first network port body; wherein, the first network port The main body is used as a management network port.

Preferably, the first network port body and the second network port body share the same ground, and the ground of the first network port body is different from the ground of the server motherboard;

And the electromagnetic compatibility protection device includes:

The input positive end is connected to the signal line of the first network port body, the input negative end is connected to the ground of the first network port body, the output positive end is connected to the signal line of the server motherboard, and the output negative end is connected to the office The isolation transformer for the ground of the server motherboard.

Preferably, the distance between the ground of the first network port body and the ground of the server motherboard is at least 20 mils.

Preferably, the double-layer network port electromagnetic compatibility circuit further includes:

An electrostatic protection device arranged on the connection line between the isolation transformer and the server main board.

A detachable capacitor connected between the ground of the first network port body and the ground of the server motherboard;

A detachable 0 ohm resistor connected between the ground of the first network port body and the ground of the server mainboard.

Preferably, there are at least two 0-ohm resistors.

Preferably, the two network port bodies provided on the server mainboard have an upper and lower network port structure; and the server chassis connected to the double-layer network port body is provided above the upper network port body and connected to the upper side of the upper network port body The folded edge of the shrapnel contact.

To solve the above technical problems, the present invention also provides a server, including:

Server motherboard;

A server chassis for installing the server motherboard;

Double-layer network port electromagnetic compatibility circuit; the double-layer network port electromagnetic compatibility circuit adopts any of the above-mentioned double-layer network port electromagnetic compatibility circuits.

The present invention provides a double-layer network port electromagnetic compatibility circuit. The two network ports on the server main board adopt the same structural design, which is convenient for mass production. However, different from the prior art, each network port only contains signal transmission The main body of the network port, the electromagnetic compatibility protection device is no longer integrated inside the main body of the network port (the network port is easier to make), but is located outside the main body of the network port, this way can be used as the management network port of the network port body outside Separately add electromagnetic compatibility protection devices, which not only meets the electromagnetic compatibility index requirements of the management network port, but also saves a set of electromagnetic compatibility protection devices and saves costs.

The present invention also provides a server, which has the same beneficial effects as the above-mentioned double-layer network port electromagnetic compatibility circuit.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present invention, the following will briefly introduce the prior art and the drawings needed in the embodiments. Obviously, the drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic structural diagram of a double-layer network port electromagnetic compatibility circuit provided by an embodiment of the present invention;

2 is a schematic diagram of the design of a separate network port provided by an embodiment of the present invention;

FIG. 3 is a design structure diagram of a double-layer network port provided by an embodiment of the present invention;

Figure 4 (a) is a schematic diagram of contact between a front server chassis and a network port according to an embodiment of the present invention;

Figure 4(b) is a schematic diagram of the contact between the improved server chassis and the network port provided by an embodiment of the present invention.

Detailed ways

The core of the present invention is to provide a double-layer network port electromagnetic compatibility circuit and server, which can separately add electromagnetic compatibility protection devices to the network port body as the management network port, thereby not only meeting the electromagnetic compatibility index requirements of the management network port, but also It also saves a set of electromagnetic compatibility protection devices and saves costs.

In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Please refer to FIG. 1, which is a schematic structural diagram of a double-layer network port electromagnetic compatibility circuit according to an embodiment of the present invention.

The double-layer network port electromagnetic compatibility circuit includes:

The first network port body 1 located on the server motherboard;

A second network port body 2 with the same structure as the first network port body 1 arranged on the server motherboard;

An electromagnetic compatibility protection device 3 arranged on the connection line between the first network port body 1 and the server main board and used to meet the electromagnetic compatibility index requirements of the first network port body 1; wherein the first network port body 1 serves as a management network口用。 Mouth use.

Specifically, the double-layer network port electromagnetic compatibility circuit of the present application includes a first network port body 1, a second network port body 2 and an electromagnetic compatibility protection device 3, and its working principle is as follows:

There are two network ports on the server motherboard, and the two network ports have the same structure, which is convenient for mass production. Among the two network ports on the server motherboard, one network port is frequently used as a management network port, and the other network port is used as a serial port (or debugging port) infrequently.

The electromagnetic compatibility index requirements of the management network port and the serial port (or debugging port) are different. The electromagnetic compatibility index requirements of the management network port are relatively high. It is necessary to integrate electromagnetic compatibility protection devices inside the management network port to meet its electromagnetic compatibility index requirements; and The electromagnetic compatibility index requirements of the serial port (or debugging port) are relatively low, and there is no need to integrate electromagnetic compatibility protection devices inside the serial port (or debugging port). However, in the prior art, in order to facilitate mass production, both network ports on the server mainboard are made as The network port with the electromagnetic compatibility protection device is integrated inside, resulting in a high cost of manufacturing the network port.

Based on this, in this application, both network ports on the server main board are made into a network port that only contains the network port body for signal transmission, that is, a network port without an internal electromagnetic compatibility protection device, which is not only convenient for mass production, but also reduces At the same time, this application considers that the management network port needs to meet the electromagnetic compatibility index requirements of the management network port before it is connected to the line on the server main board. Therefore, this application is between the management network port and the server main board. The electromagnetic compatibility protection device 3 is added to the connection line of the network to meet the electromagnetic compatibility index requirements of the management network port. In this way, the electromagnetic compatibility protection device 3 can be separately added to the network port body as the management network port, which not only satisfies The electromagnetic compatibility index requirements of the management network port have also saved a set of electromagnetic compatibility protection devices; moreover, compared to the network port integrated with the internal electromagnetic compatibility protection device, the separate design method of the network port and the electromagnetic compatibility protection device 3 of this application The advantages are as follows: The electromagnetic compatibility protection device 3 is arranged outside the network port. Since the space outside the network port is relatively large compared to the inside of the network port, the electromagnetic compatibility protection device 3 has more options and is easy to design.

On the basis of the above embodiment:

Please refer to FIG. 2, which is a schematic diagram of a design of a separate network port according to an embodiment of the present invention.

As a preferred embodiment, the first network port body 1 and the second network port body 2 share the same ground, and the ground of the first network port body 1 is different from the ground of the server motherboard;

And the electromagnetic compatibility protection device 3 includes:

The input positive terminal is connected to the signal line of the first network port body 1, the input negative terminal is connected to the ground of the first network port body 1, the output positive terminal is connected to the signal line of the server motherboard, and the output negative terminal is connected to the ground of the server motherboard Isolation transformer.

Specifically, it is known that three conditions must be met at the same time for electromagnetic interference to occur: 1) the interference source, that is, the circuit or device that generates the electromagnetic interference; 2) the coupling path, that is, the path that can transmit the electromagnetic interference generated by the interference source to the sensitive source; 3) Sensitive sources, that is, circuits or equipment affected by electromagnetic interference. These three conditions are called the three elements of electromagnetic interference. As long as one of the three elements is eliminated, the electromagnetic interference problem can be solved.

Based on this, this application uses the method of cutting off the coupling path to solve the electromagnetic interference problem that the network port may bring to the server motherboard (for example, the network port conducts interference energy to the server motherboard after lightning/static strike), specifically the two on the server motherboard The network port body shares the ground, but the network port body ground is not the same as the server motherboard ground, that is, the network port body ground and the server motherboard ground are spaced apart, and this interval serves the purpose of isolating and interfering with energy conduction.

In addition, the electromagnetic compatibility protection device 3 of the present application selects an isolation transformer. The primary and secondary windings of the isolation transformer also have the function of an isolation circuit. At the same time, considering the high frequency, the isolation between the primary and secondary windings of the isolation transformer Capacitors still cause electrostatic interference between the circuits on both sides. Therefore, in order to avoid such electrostatic interference, the primary and secondary windings of the isolation transformer of the present application are placed on different stems to reduce the capacitance between the two; Or the original and secondary windings are placed in concentric columns, but an electrostatic shield is added between the two windings to obtain higher anti-interference. And the input end of the isolation transformer is divided from the ground of the output end, the input end of the isolation transformer is connected to the ground of the network port, and the output end of the isolation transformer is connected to the ground of the server main board to realize the separation of ground signals.

As a preferred embodiment, the distance between the ground of the first network port body 1 and the ground of the server motherboard is at least 20 mils.

Specifically, in order to prevent the interference signal of the network port from passing through the ground of the network port to the ground of the server motherboard, the distance between the ground of the network port and the ground of the server motherboard is at least 20 mils. Only when this distance is reached, the interference signal can be blocked from being transmitted along the ground. .

More specifically, this application can estimate the distance between the ground of the network port and the ground of the server motherboard according to the anti-interference ability requirements between the server motherboard and the network port. When the anti-interference ability between the server motherboard and the network port is required to be high At the same time, increase the distance between the ground of the network port and the ground of the server motherboard to improve the anti-interference level.

As a preferred embodiment, the double-layer network port electromagnetic compatibility circuit further includes:

An electrostatic protection device installed on the connection line between the isolation transformer and the server motherboard.

Further, the double-layer network port electromagnetic compatibility circuit of the present application also includes an electrostatic protection device, and its working principle is as follows:

In order to improve the electrostatic protection performance of the server mainboard, this application can add an electrostatic protection device on the connection line between the first network port body and the server mainboard. Considering the connection line from the first network port body to the server mainboard: first network port main body→isolation transformer→server mainboard, this application can add electrostatic protection devices to the connection line between the first network port main body and the isolation transformer, It is also possible to add electrostatic protection devices on the connection line between the isolation transformer and the server main board, but considering that when a strong interference signal comes from the body of the first network port, the electrostatic protection device may be damaged, so this application chooses to isolate An electrostatic protection device is added to the connection line between the transformer and the server main board, which not only improves the electrostatic protection performance of the server main board, but also protects the electrostatic protection device.

A detachable capacitor connected between the ground of the first network port body 1 and the ground of the server motherboard;

A detachable 0 ohm resistor connected between the ground of the first network port body 1 and the ground of the server motherboard.

Further, the double-layer network port electromagnetic compatibility circuit of the present application also includes a detachable capacitor and a 0 ohm resistor, and its working principle is as follows:

Considering that when the device is undergoing safety testing, some tests need to connect the ground of the network port to the ground of the server motherboard. Therefore, in this application, a capacitor and a 0 ohm resistor (such as the ground of the server motherboard) should be connected between the ground of the network port and the ground of the server motherboard. C1, C2, R1, R2 in Figure 2), and capacitors and 0-ohm resistors are made into a detachable design on the circuit to meet different conditions.

As a preferred embodiment, there are at least two 0-ohm resistors.

Specifically, the number of 0 ohm resistors is required, at least 2 0 ohm resistors (0 ohm resistors in 0805 package can be used), because during the equipment safety test, the grounding continuity test is required, and the grounding is continuous The performance test needs to add 30A current to the network port. Most of the current will be conducted away with the chassis, and a small part of the current will enter the ground of the network port. However, if the resistance package between the ground of the network port and the ground of the server motherboard is too small, It will still be burned by the electric current, causing equipment damage. Therefore, when selecting the number of 0 ohm resistors in this application, at least two should be selected.

As a preferred embodiment, the two network port bodies provided on the server mainboard are of upper and lower network port structures; and the server chassis connected to the double-layer network port body is provided with a connection between the upper network port body and the upper network port body. The upper side is connected to the folded edge contacted by the shrapnel.

Specifically, the two network port bodies on the server motherboard of the present application have an upper and lower network port structure, as shown in FIG. 3 (upper network port body B+lower network port body A). Please refer to FIG. 4(a). FIG. 4(a) is a schematic diagram of contact between an improved front server chassis and a network port according to an embodiment of the present invention. In the prior art, the server motherboard is installed on the server chassis through the network port. As can be seen from Figure 4(a), due to the limitation of the server chassis structure, the network port and the server chassis are only in contact on the side of the server chassis, resulting in the network port The connection shrapnel is not sufficiently in contact with the server chassis, that is, the network port and the server chassis are not well connected, and the following problems may exist:

The two necessary conditions for electromagnetic wave radiation are the antenna and the alternating current flowing through the antenna. The reason why the device produces radiant interference is because the device contains various parasitic antennas. As long as these parasitic antennas are eliminated or reduced Radiating efficiency, or avoiding alternating current to enter these parasitic antennas, the problem of radiated electromagnetic interference can be improved.

Parasitic antennas are divided into dipole antennas and monopole antennas. Among them, the essence of a dipole antenna is the voltage existing between two conductors; a variation of the dipole antenna is a monopole antenna, and the form of a monopole antenna is only one conductor , The other conductor has the ground or other metal objects attached to it. The radiation characteristics of monopole antennas are basically the same as that of dipole antennas, but the efficiency is lower.

It can be seen that for a dipole antenna or a monopole antenna, as long as the voltage between the two conductors is eliminated, or the voltage between the conductor and the ground is eliminated, the radiation can be reduced. But dipole antennas and monopole antennas are not easy to find. This is because the voltage driving this antenna is not the working voltage of the circuit, but some unintentional voltage. This is the common mode voltage, and the common mode voltage drives the common mode current. Produce electromagnetic radiation. In order to eliminate this kind of electromagnetic radiation, the effective method is to overlap the cable with the chassis, that is, to ground, so a good overlap between the cable and the chassis plays a very important role in eliminating common mode voltage and eliminating electromagnetic radiation. However, the existing network port is not well connected to the server chassis, resulting in a poor effect of eliminating electromagnetic radiation.

Based on this, the server chassis of the present application is provided above the upper network port body with a flange that contacts the upper side connecting elastic piece of the upper network port body, as shown in Figure 4(b), as can be seen from Figure 4(b) , The contact between the network port and the server chassis is not only on the side of the server chassis, but also on the increased folding edge of the server chassis, resulting in sufficient contact between the connection shrapnel of the network port and the server chassis, that is, the network port and the server chassis are well connected, thereby improving the elimination The effect of electromagnetic radiation.

The present invention also provides a server, including:

Server motherboard;

The server chassis used to install the server motherboard;

For the introduction of the server provided by the present invention, please refer to the embodiment of the above-mentioned double-layer network port electromagnetic compatibility circuit, the present invention will not be repeated here.

It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these entities or operations. There is any such actual relationship or sequence between operations. Moreover, the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes those that are not explicitly listed Other elements of, or also include elements inherent to this process, method, article or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, article, or equipment that includes the element.

The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in this document, but should conform to the widest scope consistent with the principles and novel features disclosed in this document.

Claims

A double-layer network port electromagnetic compatibility circuit, which is characterized in that it includes:

The first network port body set on the server motherboard;

A second network port body with the same structure as the first network port body, which is provided on the server motherboard;

An electromagnetic compatibility protection device arranged on the connection line between the first network port body and the server main board and used to meet the electromagnetic compatibility index requirements of the first network port body; wherein, the first network port The main body is used as a management network port.
The double-layer network port electromagnetic compatibility circuit according to claim 1, wherein the first network port body and the second network port body share the same ground, and the ground of the first network port body is the same as that of the server. The land of the main board is different;

And the electromagnetic compatibility protection device includes:

The input positive end is connected to the signal line of the first network port body, the input negative end is connected to the ground of the first network port body, the output positive end is connected to the signal line of the server motherboard, and the output negative end is connected to the office The isolation transformer for the ground of the server motherboard.
The double-layer network port electromagnetic compatibility circuit according to claim 2, wherein the distance between the ground of the first network port body and the ground of the server main board is at least 20 mils.
The double-layer network port electromagnetic compatibility circuit according to claim 2, wherein the double-layer network port electromagnetic compatibility circuit further comprises:

An electrostatic protection device arranged on the connection line between the isolation transformer and the server main board.
The double-layer network port electromagnetic compatibility circuit according to claim 2, wherein the double-layer network port electromagnetic compatibility circuit further comprises:

A detachable capacitor connected between the ground of the first network port body and the ground of the server motherboard;

A detachable 0 ohm resistor connected between the ground of the first network port body and the ground of the server mainboard.
The double-layer network port electromagnetic compatibility circuit according to claim 5, wherein there are at least two 0-ohm resistors.
The double-layer network port electromagnetic compatibility circuit according to any one of claims 1-6, wherein the two network port bodies provided on the server main board have an upper and lower network port structure; and the server connected to the double-layer network port body The cabinet is provided with a folded edge on the upper part of the upper-layer net port body which is in contact with the upper connecting elastic piece of the upper-layer net port body.
A server, characterized in that it comprises:

Server motherboard;

A server chassis for installing the server motherboard;

Double-layer network port electromagnetic compatibility circuit; the double-layer network port electromagnetic compatibility circuit adopts the double-layer network port electromagnetic compatibility circuit according to any one of claims 1-7.