CN115940623A

CN115940623A - Electromagnetic noise isolation method and apparatus, storage medium, and electronic apparatus

Info

Publication number: CN115940623A
Application number: CN202211620702.0A
Authority: CN
Inventors: 崔杰; 鲍乐梅
Original assignee: Suzhou Inspur Intelligent Technology Co Ltd
Current assignee: Suzhou Inspur Intelligent Technology Co Ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-04-07

Abstract

The embodiment of the application provides an electromagnetic noise isolation method and device, a storage medium and an electronic device, wherein the electromagnetic noise isolation method comprises the following steps: acquiring a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane; and under the condition that the switching device is in a conducting state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, controlling the switching device to be switched from the conducting state to a disconnecting state, and performing electromagnetic noise isolation between the first power plane and the second power plane through the electromagnetic noise isolation device, wherein when the switching device is in the conducting state, the first power plane and the second power plane are connected through a first connection path, and when the switching device is in the disconnecting state, the first connection path is in the disconnecting state. Through the embodiment of the application, the technical problem that the server fails due to electromagnetic noise is solved.

Description

Electromagnetic noise isolation method and apparatus, storage medium, and electronic apparatus

Technical Field

The embodiment of the application relates to the field of computers, in particular to an electromagnetic noise isolation method and device, a storage medium and an electronic device.

Background

With the development of information technology equipment (including server products and computer products) toward high speed, high sensitivity, high integration and high stability, the requirement on electromagnetic compatibility is also increasing. The server is used as a key device for processing big data in information technology equipment, and has strict requirements on a power supply. Particularly, the dc power supply for each group of high-speed chips on the server motherboard has high requirements for voltage stability and electromagnetic noise. With the increasing of the switching frequency and switching speed of the dc power conversion, the problem of the ripple and high frequency noise of the power supply chip output power is more prominent.

In the prior art, the electromagnetic noise is often reduced by adjusting the capacitance value in a manner of adding a capacitor to an output path of a power supply. In this way, the electromagnetic noise that can be reduced by the capacitance value is limited, the power of the server is large, the electromagnetic noise of the server cannot be effectively reduced by the capacitance, the requirement of the server for the electromagnetic noise is high, and the server may malfunction if the electromagnetic noise exists slightly.

Aiming at the technical problem that the server fails due to electromagnetic noise in the related art, an effective solution is not provided.

Disclosure of Invention

The embodiment of the application provides an electromagnetic noise isolation method and device, a storage medium and an electronic device, so as to at least solve the problem that the electromagnetic noise causes the server to break down in the related art.

According to an embodiment of the present application, there is provided an electromagnetic noise isolation method including: acquiring a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, wherein two parallel connection paths are arranged between the first power plane and the second power plane, a first connection path of the two connection paths comprises a switch device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, the electromagnetic noise detection circuit is used for detecting whether the first power plane and the second power plane generate electromagnetic noise, and the first level signal is used for indicating whether at least one of the first power plane and the second power plane generates electromagnetic noise; and under the condition that the switching device is in a conducting state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, controlling the switching device to be switched from the conducting state to a disconnecting state, and performing electromagnetic noise isolation between the first power plane and the second power plane through the electromagnetic noise isolation device, wherein when the switching device is in the conducting state, the first power plane and the second power plane are connected through the first connection path, and when the switching device is in the disconnecting state, the first connection path is in the disconnecting state.

In one exemplary embodiment, after the controlling the switching device to switch from the on state to the off state, the method further comprises: acquiring a second level signal output by the electromagnetic noise detection circuit, wherein the second level signal is used for indicating whether at least one of the first power plane and the second power plane generates electromagnetic noise; and controlling the switching device to switch from the off state to the on state in a case where the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, wherein the first connection path is in the on state when the switching device is in the on state.

In an exemplary embodiment, after the acquiring the second level signal output by the electromagnetic noise detection circuit, the method further includes: and under the condition that the second level signal comprises level signals output by the electromagnetic noise detection circuit and detected for N times continuously, and the values of the level signals detected for N times continuously are both first values, determining that the second level signal indicates that the first power plane and the second power plane do not generate electromagnetic noise, wherein N is a positive integer greater than or equal to 2, and the level signal with the first value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise is not detected by the first power plane and the second power plane.

In one exemplary embodiment, after said obtaining a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, the method further comprises: when the first level signal comprises level signals output by the electromagnetic noise detection circuit and detected for M times continuously, and values of the level signals detected for M times continuously are all second values, determining that the first level signal represents that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein M is a positive integer greater than or equal to 2, and the level signal with the second value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise generated by at least one of the first power plane and the second power plane is detected; or determining that the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, in a case where the first level signal is a level signal taking the second value.

In one exemplary embodiment, before the obtaining the first level signal output by the electromagnetic noise detection circuit between the first power plane and the second power plane, the method further comprises: detecting, by the electromagnetic noise detection circuit, whether there is a voltage difference between the first power plane and the second power plane in a case where the first power plane and the second power plane are set to be power planes of the same voltage; under the condition that a voltage difference between the first power plane and the second power plane is not detected, determining that the electromagnetic noise is not generated by the first power plane and the second power plane, and outputting a level signal with a first value through the electromagnetic noise detection circuit; under the condition that a voltage difference exists between the first power plane and the second power plane, determining that at least one of the first power plane and the second power plane generates the electromagnetic noise, and outputting a level signal with a second value through the electromagnetic noise detection circuit, wherein the first value is different from the second value; the first level signal includes the level signal taking the first value or the level signal taking the second value.

According to another embodiment of the present application, there is provided an electromagnetic noise isolation circuit including: the power supply device comprises a first power plane and a second power plane, wherein two parallel connection paths are arranged between the first power plane and the second power plane, a first connection path of the two connection paths comprises a switch device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, and the electromagnetic noise isolation device is used for performing electromagnetic noise isolation between the first power plane and the second power plane; an electromagnetic noise detection circuit connected to the first power plane and the second power plane, the electromagnetic noise detection circuit configured to detect whether the first power plane and the second power plane generate electromagnetic noise; and the switch control circuit is connected with the switch device and used for controlling the switch device to be switched from the on state to the off state under the condition that the switch device is in the on state and a first level signal output by the electromagnetic noise detection circuit indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein when the switch device is in the on state, the first power plane and the second power plane are connected through the first connecting path, and when the switch device is in the off state, the first connecting path is in the off state and performs electromagnetic noise isolation between the first power plane and the second power plane through the electromagnetic noise isolation device.

In one exemplary embodiment, further comprising:

and the control chip is connected with the electromagnetic noise detection circuit and the switch control circuit, and is used for receiving the first level signal output by the electromagnetic noise detection circuit and outputting a first control signal to the switch control circuit under the condition that the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein the first control signal is used for controlling the switching device to be switched from the on state to the off state through the switch control circuit.

In an exemplary embodiment, the control chip is further configured to receive a second level signal output by the electromagnetic noise detection circuit, and output a second control signal to the switch control circuit when the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, where the second control signal is configured to control the switching device to switch from the off state to the on state through the switch control circuit, and where the first connection path is in the on state when the switching device is in the on state.

In an exemplary embodiment, the control chip is further configured to determine whether the second level signal indicates that neither the first power plane nor the second power plane is generating electromagnetic noise by: and under the condition that the second level signal comprises a level signal output by the electromagnetic noise detection circuit and continuously detected by the control chip for N times, and the values of the level signal continuously detected for N times are both a first value, determining that the second level signal indicates that the first power plane and the second power plane do not generate electromagnetic noise, wherein N is a positive integer greater than or equal to 2, and the level signal with the first value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise is not detected by the first power plane and the second power plane.

In one exemplary embodiment, in a case where the first power plane and the second power plane are set to be power planes having the same voltage, the electromagnetic noise detection circuit further includes: a voltage difference detection device connected to the first power plane and the second power plane, the voltage difference detection device being configured to detect whether a voltage difference exists between the first power plane and the second power plane; a signal output circuit connected to the voltage difference detection device, the signal output circuit being configured to output a level signal having a first value when a voltage difference between the first power plane and the second power plane is not detected, where the level signal having the first value indicates that neither the first power plane nor the second power plane generates the electromagnetic noise; outputting a level signal taking a second value when a voltage difference between the first power plane and the second power plane is detected, wherein the first value is different from the second value, and the level signal taking the second value indicates that at least one of the first power plane and the second power plane generates the electromagnetic noise; the first level signal includes the level signal taking the first value or the level signal taking the second value.

In an exemplary embodiment, the electromagnetic noise isolation device comprises a magnetic bead or an electromagnetic compatibility EMC inductor.

According to still another embodiment of the present application, there is provided an electromagnetic noise isolation apparatus including:

a first obtaining module, configured to obtain a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, where the first power plane and the second power plane have two parallel connection paths therebetween, a first connection path of the two connection paths includes a switching device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, the electromagnetic noise detection circuit is configured to detect whether the first power plane and the second power plane generate electromagnetic noise, and the first level signal is used to indicate whether at least one of the first power plane and the second power plane generates electromagnetic noise;

a first control module, configured to control, by a switch control circuit, the switching device to switch from an on state to an off state when the switching device is in the on state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, where when the switching device is in the on state, the first power plane and the second power plane are connected through the first connection path, and when the switching device is in the off state, the first connection path is in the off state, and the electromagnetic noise isolation device is configured to isolate electromagnetic noise between the first power plane and the second power plane when the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, and when the switching device is in the off state.

According to a further embodiment of the application, there is also provided a computer-readable storage medium having a computer program stored thereon, wherein the computer program is arranged to perform the steps of any of the above method embodiments when executed.

According to yet another embodiment of the present application, there is also provided an electronic device, comprising a memory having a computer program stored therein and a processor configured to run the computer program to perform the steps of any of the method embodiments described above.

According to the embodiment of the application, under the condition that the level signal output by the electromagnetic noise detection circuit is used for indicating that at least one of the connected power planes generates electrical measurement noise, the electric connection path between the power planes is disconnected in a mode of controlling the switching device to be switched from the on state to the off state, electromagnetic noise isolation is timely carried out between the power planes through the electromagnetic noise isolation device, and possible faults of the server caused by the electromagnetic noise are avoided. Therefore, the problem that the server fails due to electromagnetic noise can be solved, and the technical effect of avoiding the server from failing due to the electromagnetic noise is achieved.

Drawings

Fig. 1 is a schematic diagram of a network architecture of a server according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a power plane according to an embodiment of the present application;

FIG. 3 is a flow chart of an electromagnetic noise isolation method according to an embodiment of the present application;

FIG. 4 is a first schematic diagram of an electromagnetic noise isolation circuit according to an embodiment of the present application;

FIG. 5 is a second schematic diagram of an electromagnetic noise isolation circuit according to an embodiment of the present application;

FIG. 6 is a third schematic diagram of an electromagnetic noise isolation circuit according to an embodiment of the present application;

FIG. 7 is a schematic diagram of an electromagnetic noise detection circuit according to an embodiment of the present application;

FIG. 8 is a schematic diagram of a switch control circuit according to an embodiment of the present application;

FIG. 9 is a schematic illustration of a method of electromagnetic noise isolation according to an embodiment of the present application;

fig. 10 is a block diagram of an electromagnetic noise isolator according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It should be noted that the terms "first," "second," and the like in the description and claims of the embodiments of the present application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The embodiment of the present application may operate on the network architecture shown in fig. 1, where fig. 1 is a schematic diagram of a network architecture of a server according to the embodiment of the present application, and as shown in fig. 1, the network architecture includes: server 102, server 104, and server 106.

The power planes in the embodiment of the present application may be explained by taking, but not limited to, the server 102 as an example, and fig. 2 is a schematic diagram of a power plane according to the embodiment of the present application, as shown in fig. 2, a server motherboard 104 is deployed on the server 102, and there are multiple layers in the server motherboard 104, where one layer is a power plane 106, planes in a certain range are divided from the power plane 106 as power planes according to power supply requirements of chips in the server, but not limited to, and power planes with the same voltage value may have, but not limited to, a connection relationship. Such as: power plane 110 and power plane 108 may be disposed on power plane 106, but are not limited to being disposed thereon, and power plane 110 and power plane 108 have the same voltage value, and power plane 110 and power plane 108 are connected.

In an embodiment of the present application, there is provided an electromagnetic noise isolation method for each server operating in the network architecture, and fig. 3 is a flowchart of the electromagnetic noise isolation method according to the embodiment of the present application, and as shown in fig. 3, the flowchart includes the following steps:

step S302, obtaining a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, where the first power plane and the second power plane have two parallel connection paths, a first connection path of the two connection paths includes a switching device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, the electromagnetic noise detection circuit is configured to detect whether the first power plane and the second power plane generate electromagnetic noise, and the first level signal is used to indicate whether at least one of the first power plane and the second power plane generates electromagnetic noise;

step S304, when the switching device is in an on state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, controlling the switching device to switch from the on state to an off state, and performing electromagnetic noise isolation between the first power plane and the second power plane through the electromagnetic noise isolation device, where when the switching device is in the on state, the first power plane and the second power plane are connected through the first connection path, and when the switching device is in the off state, the first connection path is in the off state.

Through the steps, under the condition that the level signal output by the electromagnetic noise detection circuit is used for indicating that at least one of the connected power planes generates electrical measurement noise, the electrical connection path between the power planes is disconnected in a mode of controlling the switching device to be switched from the on state to the off state, and the electromagnetic noise isolation device is used for isolating the electromagnetic noise between the power planes in time, so that possible faults of the server caused by the electromagnetic noise are avoided. Therefore, the problem that the server fails due to electromagnetic noise can be solved, and the technical effect of avoiding the server from failing due to the electromagnetic noise is achieved.

The execution subject of the above steps may be a server, etc., but is not limited thereto.

The execution sequence of step S302 and step S304 may be interchanged, that is, step S304 may be executed first, and then step S302 may be executed.

In the technical solution provided in step S302, there are two parallel connection paths between the first power plane and the second power plane, and in the case that neither of the first power plane and the second power plane generates electromagnetic noise, the first power plane and the second power plane may be connected through, but not limited to, the two parallel connection paths.

Optionally, in this embodiment, when the change frequency of the transient current of the load exceeds the adjustable range of the power chip of the server motherboard, the voltage output of the voltage regulator will drop, so as to generate electromagnetic noise. The electromagnetic noise may include, but is not limited to, electromagnetic noise generated by high frequency current, electromagnetic noise generated by power supply, and the like, and may occur at both the source side (i.e., power supply output side) and the load side (i.e., power supply input side). The method can be used for detecting whether electromagnetic noise is generated between the connected power planes in real time through the electromagnetic noise detection circuit, and outputting the first level signal, so that the timeliness of detecting whether the electromagnetic noise is generated between the connected power planes is improved.

Optionally, in this embodiment, the switching device may include, but is not limited to, various types of MOS transistors (Metal-Oxide-Semiconductor Field-Effect Transistor), such as: PMOS transistors (P-channel type) and NMOS transistors (N-channel type), etc.

Optionally, in this embodiment, the electromagnetic noise isolation device may be, but is not limited to, used for suppressing and absorbing high-frequency noise and spike interference on a signal line or a power line, so as to reduce the influence of electromagnetic noise on a power plane, and further improve the stability of server operation.

In one exemplary embodiment, determining whether the power plane generates electromagnetic noise based on the first level signal may include, but is not limited to, one of:

the first situation is as follows: and when the first level signal comprises level signals output by the electromagnetic noise detection circuit and detected for M times continuously, and values of the level signals detected for M times continuously are all second values, determining that the first level signal represents that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein M is a positive integer greater than or equal to 2, and the level signal with the second value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise generated by at least one of the first power plane and the second power plane is detected.

Optionally, in this embodiment, but not limited to, in a case where the electromagnetic noise detection circuit detects level signals whose values are both the second values continuously multiple times, it may be indicated that at least one of the first power plane and the second power plane generates electromagnetic noise. Through such a mode, can filter the electromagnetic noise that duration is extremely short, but detect the electromagnetic noise that duration satisfies the time threshold, promoted the precision of the level signal of electromagnetic noise detection circuit output.

Case two: determining that the first level signal is indicative of electromagnetic noise generated by at least one of the first power plane and the second power plane, in a case where the first level signal is a level signal taking the second value.

Optionally, in this embodiment, it may be, but is not limited to, that when the electromagnetic noise detection circuit detects that the level signals have the second value, at least one of the first power plane and the second power plane generates electromagnetic noise. By the mode, under the condition that the power plane generates electromagnetic noise, continuous electromagnetic noise can be detected in time, and timeliness of level signals output by the electromagnetic noise detection circuit is improved.

In one exemplary embodiment, the electromagnetic noise detection circuit may output the first level signal by, but is not limited to: detecting, by the electromagnetic noise detection circuit, whether there is a voltage difference between the first power plane and the second power plane in a case where the first power plane and the second power plane are set to be power planes of the same voltage; under the condition that a voltage difference between the first power plane and the second power plane is not detected, determining that the electromagnetic noise is not generated by the first power plane and the second power plane, and outputting a level signal with a first value through the electromagnetic noise detection circuit; under the condition that a voltage difference exists between the first power plane and the second power plane, determining that at least one of the first power plane and the second power plane generates the electromagnetic noise, and outputting a level signal with a second value through the electromagnetic noise detection circuit, wherein the first value is different from the second value; the first level signal includes the level signal taking the first value or the level signal taking the second value.

Optionally, in this embodiment, the first power plane and the second power plane may be, but are not limited to, set to be power planes with the same voltage, and in this way, when the electromagnetic noise detection circuit detects a voltage difference between the first power plane and the second power plane, the detected voltage difference is a voltage difference between the power planes, but not a voltage difference caused by the electromagnetic noise generated by the power planes, which may improve accuracy of the electromagnetic noise detection circuit in detecting the voltage difference between the power planes.

In the above-mentioned technical solution provided in step S304, but not limited to, in a case where the switching device is in the on state and the first level signal is a level signal of the second value, it may be indicated that the first power plane and the second power plane are connected through the first connection path and the second connection path, and at least one of the first power plane and the second power plane generates electromagnetic noise, in such a case, the first connection path between the first power plane and the second power plane may be disconnected by controlling the switching device to switch from the on state to the off state, so that the first power plane and the second power plane are connected only through the second connection path, and then electromagnetic noise isolation is performed between the first power plane and the second power plane through the electromagnetic noise isolation device. By the mode, the isolation of the electromagnetic noise between the connected power planes is realized, and the mutual interference of the electromagnetic noise between the power planes is greatly reduced.

In an exemplary embodiment, after the controlling the switching device to switch from the on state to the off state, the first connection path may be restored by, but is not limited to: acquiring a second level signal output by the electromagnetic noise detection circuit, wherein the second level signal is used for indicating whether at least one of the first power plane and the second power plane generates electromagnetic noise; and controlling the switching device to switch from the off state to the on state in a case where the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, wherein the first connection path is in the on state when the switching device is in the on state.

Optionally, in this embodiment, after the first connection path is disconnected, the electromagnetic noise detection circuit may, but is not limited to, continuously detect whether the power plane generates electromagnetic noise, and output a corresponding second level signal, and may, but is not limited to, restore the first connection path in a case that the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise. By the mode, the connection path between the power planes can be flexibly switched according to whether the power planes generate electromagnetic noise, and the flexibility of the connection path between the power planes is improved.

Optionally, in this embodiment, in a case where the second level signal is used to indicate that at least one of the first power plane and the second power plane generates electromagnetic noise, the switching device may be, but is not limited to, controlled to continue to maintain the off state, and the electromagnetic noise detection circuit may be, but is not limited to, continue to detect whether the power plane generates electromagnetic noise and output a corresponding second level signal, until the switching device is controlled to switch from the off state to the on state in a case where the second level signal is used to indicate that neither of the first power plane and the second power plane generates electromagnetic noise.

In the embodiment of the present application, an electromagnetic noise isolation circuit operating in each server in the network architecture is provided, and fig. 4 is a first schematic diagram of an electromagnetic noise isolation circuit according to the embodiment of the present application, as shown in fig. 4, the electromagnetic noise isolation circuit may include, but is not limited to: a power plane 110 (i.e. the first power plane) and a power plane 108 (i.e. the second power plane), wherein there are two parallel connection paths between the power plane 110 and the power plane 108, a connection path 01 (i.e. the first connection path) of the two connection paths includes a switching device 204, a connection path 02 (i.e. the second connection path) of the two connection paths is provided with an electromagnetic noise isolation device 202, and the electromagnetic noise isolation device 202 is used for performing electromagnetic noise isolation between the power plane 110 and the power plane 108; an electromagnetic noise detection circuit 208 connected to the power plane 110 and the power plane 108, wherein the electromagnetic noise detection circuit 208 is configured to detect whether the power plane 110 and the power plane 108 generate electromagnetic noise; and a switch control circuit 206 connected to the switching device 204, for controlling the switching device 204 to switch from the on state to the off state if the switching device 204 is in the on state and the first level signal output by the electromagnetic noise detection circuit 208 indicates that at least one of the power plane 110 and the power plane 108 generates electromagnetic noise, wherein when the switching device 204 is in the on state, the power plane 110 and the power plane 108 are connected through a connection path 01, and when the switching device is in the off state, the connection path 01 is in the off state, and electromagnetic noise isolation is performed between the power plane 110 and the power plane 108 through an electromagnetic noise isolation device.

In an exemplary embodiment, the above electromagnetic noise isolation circuit may include, but is not limited to, a control chip connected to the electromagnetic noise detection circuit and the switch control circuit, the control chip being configured to receive the first level signal output by the electromagnetic noise detection circuit and output a first control signal to the switch control circuit if the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein the first control signal is configured to control the switching device to be switched from the on state to the off state by the switch control circuit.

Optionally, in this embodiment, the control chip may include but is not limited to a BMC (Baseboard Management Controller) chip, and may obtain the first level signal through the control chip and output a corresponding control signal. Fig. 5 is a second schematic diagram of an electromagnetic noise isolation circuit according to an embodiment of the present application, and as shown in fig. 5, the electromagnetic noise isolation circuit may include, but is not limited to: a power plane 110 (i.e., the first power plane) and a power plane 108 (i.e., the second power plane), wherein there are two parallel connection paths between the power plane 110 and the power plane 108, a connection path 01 (i.e., the first connection path) of the two connection paths includes a switching device 204, a connection path 02 (i.e., the second connection path) of the two connection paths has an electromagnetic noise isolation device 202, and the electromagnetic noise isolation device 202 is configured to perform electromagnetic noise isolation between the power plane 110 and the power plane 108; an electromagnetic noise detection circuit 208 connected to the power plane 110 and the power plane 108, wherein the electromagnetic noise detection circuit 208 is configured to detect whether the power plane 110 and the power plane 108 generate electromagnetic noise; and a switch control circuit 206 connected to the switching device 204, for controlling the switching device 204 to switch from the on state to the off state if the switching device 204 is in the on state and the first level signal output by the electromagnetic noise detection circuit 208 indicates that at least one of the power plane 110 and the power plane 108 generates electromagnetic noise, wherein when the switching device 204 is in the on state, the power plane 110 and the power plane 108 are connected through a connection path 01, and when the switching device is in the off state, the connection path 01 is in the off state, and electromagnetic noise isolation is performed between the power plane 110 and the power plane 108 through an electromagnetic noise isolation device.

And a control chip 210 connected to the electromagnetic noise detection circuit 208 and the switch control circuit 206, wherein the control chip 210 is configured to receive the first level signal output by the electromagnetic noise detection circuit 208, and output a first control signal to the switch control circuit 206 when the first level signal indicates that at least one of the power plane 110 and the power plane 108 generates electromagnetic noise, where the first control signal is used to control the switching device 204 to be switched from the on state to the off state by the switch control circuit 206.

In an exemplary embodiment, the control chip may further be but not limited to be configured to receive a second level signal output by the electromagnetic noise detection circuit, and output a second control signal to the switch control circuit in a case that the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, where the second control signal is configured to control the switching device to be switched from the off state to the on state by the switch control circuit, and where the second connection path is in the on state when the switching device is in the on state.

In one exemplary embodiment, the control chip is further configured to determine whether the second level signal indicates that neither the first power plane nor the second power plane is generating electromagnetic noise by: and under the condition that the second level signal comprises a level signal output by the electromagnetic noise detection circuit and continuously detected by the control chip for N times, and the values of the level signal continuously detected for N times are both a first value, determining that the second level signal indicates that the first power plane and the second power plane do not generate electromagnetic noise, wherein N is a positive integer greater than or equal to 2, and the level signal with the first value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise is not detected by the first power plane and the second power plane.

In one exemplary embodiment, in a case where the first power plane and the second power plane are set to be power planes having the same voltage, the electromagnetic noise detection circuit further includes: a voltage difference detection device connected to the first power plane and the second power plane, the voltage difference detection device being configured to detect whether a voltage difference exists between the first power plane and the second power plane; a signal output circuit connected to the voltage difference detection device, the signal output circuit being configured to output a level signal having a first value when a voltage difference between the first power plane and the second power plane is not detected, where the level signal having the first value indicates that neither the first power plane nor the second power plane generates the electromagnetic noise; outputting a level signal having a second value when it is detected that a voltage difference exists between the first power plane and the second power plane, wherein the first value is different from the second value, and the level signal having the second value indicates that at least one of the first power plane and the second power plane generates the electromagnetic noise; the first level signal includes the level signal taking the first value or the level signal taking the second value.

Optionally, in this embodiment, it may be, but is not limited to, detect whether there is a voltage difference between the first power plane and the second power plane by using a voltage difference detection device, and as shown in fig. 6, fig. 6 is a third schematic diagram of an electromagnetic noise isolation circuit according to an embodiment of the present application, where the electromagnetic noise isolation circuit may include, but is not limited to: power plane 110 (i.e., the first power plane described above), power plane 108 (i.e., the second power plane described above), switch control circuitry 206, control chip 210, electromagnetic noise detection circuitry 208 may include, but is not limited to, signal output circuitry 208-2 and voltage difference detection device 208-1.

Two parallel connection paths are arranged between the power plane 110 and the power plane 108, a connection path 01 (i.e. the first connection path) of the two connection paths includes a switch device 204, a connection path 02 (i.e. the second connection path) of the two connection paths is provided with an electromagnetic noise isolation device 202, and the electromagnetic noise isolation device 202 is used for performing electromagnetic noise isolation between the power plane 110 and the power plane 108;

and a switch control circuit 206 connected to the switching device 204, for controlling the switching device 204 to switch from the on state to the off state if the switching device 204 is in the on state and the first level signal output by the electromagnetic noise detection circuit 208 indicates that at least one of the power plane 110 and the power plane 108 generates electromagnetic noise, wherein when the switching device 204 is in the on state, the power plane 110 and the power plane 108 are connected through a connection path 01, and when the switching device is in the off state, the connection path 01 is in the off state, and electromagnetic noise isolation is performed between the power plane 110 and the power plane 108 through an electromagnetic noise isolation device.

And a control chip 210 connected to the signal output circuit 208-2 and the switch control circuit 206, wherein the control chip 210 is configured to receive the first level signal output by the signal output circuit 208-2 and output a first control signal to the switch control circuit 206 in a case where the first level signal indicates that at least one of the power plane 110 and the power plane 108 generates electromagnetic noise, where the first control signal is configured to control the switching device 204 to be switched from the on state to the off state by the switch control circuit 206.

A voltage difference detection device 208-1 coupled to power plane 110 (i.e., the first power plane described above) and power plane 108 (i.e., the second power plane described above), voltage difference detection device 208-1 for detecting whether a voltage difference exists between power plane 110 and power plane 108; the signal output circuit 208-2 is connected to the voltage difference detection device 208-1, and the signal output circuit 208-2 is configured to output a level signal with a first value when a voltage difference between the power plane 110 and the power plane 108 is not detected, where the level signal with the first value indicates that neither the power plane 110 nor the power plane 108 generates electromagnetic noise; outputting a level signal taking a second value when a voltage difference between the power plane 110 and the power plane 108 is detected, wherein the first value is different from the second value, and the level signal taking the second value indicates that at least one of the power plane 110 and the power plane 108 generates electromagnetic noise; the first level signal comprises the level signal with the value of the first value or the level signal with the value of the second value.

Optionally, in this embodiment, the electromagnetic noise generated by the power plane may be absorbed by, but not limited to, a Magnetic bead or an EMC (electromagnetic Compatibility) inductor or the like. The magnetic beads can be used for suppressing high-frequency noise and spike interference on a signal line and a power line, and have the capacity of absorbing electrostatic pulses. When the magnetic bead path is arranged between the connected power planes, the magnetic bead can isolate the electromagnetic noise between the power plane A and the power plane B, so that the loop path of the electromagnetic noise is reduced, and the electromagnetic radiation effect caused by high-frequency noise is greatly reduced.

In order to better understand the above electromagnetic noise isolation circuit, the following explains the process of implementing electromagnetic noise isolation in the embodiment of the present application with an alternative embodiment, which can be used in the embodiment of the present application without limitation.

Fig. 7 is a schematic diagram of an electromagnetic noise detection circuit according to an embodiment of the present application, as shown in fig. 7, the electromagnetic noise detection circuit may include, but is not limited to, an inductor L1, an inductor L2, a capacitor C1, a capacitor C2, an operational amplifier 702 (i.e., the above voltage difference detection device), a MOS transistor M1, a MOS transistor M2, a resistor R1, a resistor R2, and a resistor R3, and the signal output circuit may include, but is not limited to, a MOS transistor M1, a MOS transistor M2, a resistor R1, a resistor R2, and a resistor R3. The MOS transistors M1 and M2 may be, but are not limited to, nmos transistors.

VCC _ a (i.e., the first power plane) is connected in series with the inductor L1 and the capacitor C1 and then connected to the non-inverting input terminal 5 of the operational amplifier 702, VCC _ B (i.e., the second power plane) is connected in series with the inductor L2 and the capacitor C2 and then connected to the inverting input terminal 6 of the operational amplifier 702, the output terminal 7 of the operational amplifier 702 is connected to the gate of the MOS transistor M1, the pin 8 of the operational amplifier 702 is connected to the resistor R1 and then connected to VCC _5V, and the pin 4 of the operational amplifier 702 is grounded. The source electrode of the MOS tube M1 is grounded, the drain electrode of the MOS tube M1 is connected with the grid electrode of the MOS tube M2 and then connected with the resistor R3, the source electrode of the MOS tube M2 is grounded, and the drain electrode of the MOS tube M2 is connected with the resistor R2 and then connected with VCC _5V. N _ out is used to indicate a level signal (i.e., the first level signal) output to the BMC chip (i.e., the control chip).

The electromagnetic noise signal sampling may be, but is not limited to, by an inductor L and capacitor C series circuit. Inductance and capacitor series resonance circuit has the characteristics: in a series resonant circuit, the current in the circuit reaches a maximum when the signal approaches a particular frequency, which is called the resonant frequency. When an input signal passes through the inductor and capacitor series circuit, according to the characteristics of the inductor and the capacitor, the higher the signal frequency, the higher the impedance of the inductor is, and the lower the impedance of the capacitor is, the higher the impedance is, the greater the attenuation of the signal is, the higher the frequency signal passes through the inductor and is greatly attenuated, and the direct current signal cannot pass through the capacitor. The impedance of the inductor and capacitor series circuit is minimal when the frequency of the input signal is equal to the frequency at which the inductor and capacitor resonate. Therefore, the electromagnetic noise of the power plane of the server mainboard can be respectively detected by adjusting the values of the inductor and the capacitor.

Under the condition that electromagnetic noise occurs on at least part of the power planes VCC _ a and VCC _ B, a voltage difference exists between VCC _ a and VCC _ B, so that different voltage drops exist on the inductor, under such a condition, a voltage difference exists between the input end (at least one of the non-inverting input end 5 and the inverting input end 6) of the operational amplifier 702, the operational amplifier 702 outputs the amplified voltage, and further drives the MOS transistor M1 to be turned on, so as to pull down the gate input voltage of the MOS transistor M2, and N _ out for BMC is a high-level signal (i.e., the level signal of the second value).

Under the condition that no electromagnetic noise occurs in VCC _ a and VCC _ B, no voltage difference exists between VCC _ a and VCC _ B, and no voltage drop exists in the inductor, in such a case, no voltage difference exists between the input terminals (the non-inverting input terminal 5 and the inverting input terminal 6) of the operational amplifier 702, the MOS transistor M1 is kept off, the MOS transistor M2 is turned on, and then N _ out for BMC is a low-level signal (i.e., the level signal of the first value).

Under the condition that the BMC chip acquires the level signal output by the electromagnetic noise detection circuit, the BMC chip can output a corresponding control signal to the switch control circuit according to the value of the level signal, and then control the switch device to be switched to a conducting state or a disconnecting state. In the case that the N _ out for BMC is a high level signal (i.e. the level signal of the second value), the BMC chip may, but is not limited to, detect the level signal output by the electromagnetic noise detection circuit again after 30ms (or 10ms or 40ms, etc.), and if the level signal is still a high level signal, the BMC chip outputs a low level control signal (i.e. the first control signal) to the switch control circuit. When the N _ out for BMC is a low level signal (i.e., the level signal of the first value), the BMC chip outputs a high level control signal (i.e., the second control signal) to the switch control circuit.

Fig. 8 is a schematic diagram of a switch control circuit according to an embodiment of the present application, and as shown in fig. 8, VCC _ a (i.e., the above-mentioned first power plane) and VCC _ B (i.e., the above-mentioned second power plane) may be connected, but not limited to, by a connection path 01 and a connection path 02 connected in parallel, where the connection path 01 includes a MOS transistor M5 (i.e., the above-mentioned switch device), and the connection path 02 includes a magnetic bead 706 (i.e., the above-mentioned electromagnetic noise isolation device). The switch control circuit includes: operational amplifier 704, MOS transistor M6, MOS transistor M7, resistor R1, resistor R14, resistor R16, resistor R15, and VCC _5V.

The non-inverting input terminal 5' of the operational amplifier 704 is connected to an output terminal BMC _ GPIO (General-purpose input/output) of the BMC chip (i.e., the control chip), the inverting input terminal 6' of the operational amplifier 704 is grounded, the pin 8' of the operational amplifier 704 is connected to the resistor R14 and then connected to VCC _5V, the pin 4' of the operational amplifier 704 is grounded, the output terminal 7' of the operational amplifier 704 is connected to the gate of the MOS transistor M6, the source of the MOS transistor M6 is grounded, the drain of the MOS transistor M6 is connected to the gate of the MOS transistor M7 and then connected to the resistor R16, the resistor R14 is connected to the resistor R16, the source of the MOS transistor M7 is grounded, and the drain of the MOS transistor M7 is connected to the gate of the MOS transistor M5. The resistor R15 is connected with the grid of the MOS transistor M5 and then connected with the resistor R16 in parallel.

When the N _ out for BMC is a high level signal (i.e., the level signal of the second value), the BMC chip outputs a low level control signal (i.e., the first control signal) to the switch control circuit. Under such a situation, BMC _ GPIO is a low level signal, then the operational amplifier 704 has no voltage output, and further disconnects the MOS transistor M6, and the gate of the MOS transistor M7 is connected to VCC _5V, then the MOS transistor M7 is turned on, and further disconnects the MOS transistor M5, so that VCC _ a and VCC _ B are connected only through the magnetic bead 706, isolation between electromagnetic noise generated by the power plane is realized, and stability of server operation is improved.

After the BMC chip disconnects the MOS transistor M5 through the switch control circuit, so that VCC _ a and VCC _ B are connected only through the magnetic bead 706, the BMC chip detects the level signal of the N _ out for BMC signal (i.e., the second level signal) at intervals of 30ms (or 10ms or 40ms, etc.), and if the N _ out for BMC is a high level signal, the BMC _ GPIO continues to maintain the low level signal. If the N _ out for BMC is detected to be a low level signal twice (or three times or four times, etc.), the BMC chip outputs a high level control signal (i.e., the second control signal) to the switch control circuit, the BMC _ GPIO is changed from the low level signal to a high level signal, the operational amplifier 704 outputs a voltage to drive the MOS transistor M6 to be turned on, the gate of the MOS transistor M7 is grounded, the MOS transistor M7 is turned off, and the MOS transistor M5 is turned on, so that the VCC _ a and the VCC _ B can be connected through the MOS transistor M5 and the magnetic bead 706.

When the N _ out for BMC is a low level signal (i.e., the level signal of the first value), the BMC chip outputs a high level control signal (i.e., the second control signal) to the switch control circuit. Under such a situation, BMC _ GPIO is a high-level signal, then the operational amplifier 704 outputs a voltage to further drive the MOS transistor M6 to be turned on, the gate of the MOS transistor M7 is grounded, then the MOS transistor M7 is turned off, and then the MOS transistor M5 is turned on, so that VCC _ a and VCC _ B can be connected through the MOS transistor M5 and the magnetic bead 706.

In order to better understand the implementation flow of the above-mentioned method for isolating electromagnetic noise, fig. 9 is a schematic diagram of a method for isolating electromagnetic noise according to an embodiment of the present application, as shown in fig. 9, during a normal operation of a server, a power plane 110 (i.e., the above-mentioned first power plane) and a power plane 108 (i.e., the above-mentioned second power plane) are connected by a connection path 01 and a connection path 02 connected in parallel, a MOS transistor (i.e., the above-mentioned switching device) is disposed on the connection path 01, and a magnetic bead (i.e., the above-mentioned electromagnetic noise isolating device) is disposed on the connection path 02, which can detect whether at least one of the power plane 110 and the power plane 108 generates electromagnetic noise through an electromagnetic noise detection circuit, but is not limited to detecting whether at least one of the power plane 110 and the power plane 108 generates electromagnetic noise, and in a case that neither the power plane 110 nor the power plane 108 generates electromagnetic noise, a signal output circuit outputs a low-level signal (i.e., the above-mentioned level signal taking a second value) to a BMC chip.

When electromagnetic noise is generated in at least one of the power plane 110 and the power plane 108, the signal output circuit outputs a high level signal (i.e., the level signal whose value is the first value) to the BMC chip, the BMC chip detects the level signal output by the signal output circuit at every 30ms (or 10ms or 40ms, etc.), if the N _ out for BMC signal is still a high level signal, the BMC chip outputs a low level control signal (i.e., the first control signal) to the switch control circuit, the BMC _ GPIO changes from the high level signal to the low level signal, and the connection path 01 between the power plane 110 and the power plane 108 is disconnected, so that the power plane 110 and the power plane 108 are connected only through the magnetic beads.

If the N _ out for BMC signal is a low signal, the BMC chip continuously detects whether there is electromagnetic noise between the power plane 110 and the power plane 108, and controls the connection between the power plane 110 and the power plane 108 only through the magnetic beads in case that electrical noise is generated by at least one of the power plane 110 and the power plane 108.

Through the embodiment, the power supply mode of the power plane can be automatically switched through the magnetic beads and the MOS tubes, and the high-frequency electromagnetic noise at the output end of the power plane and the high-frequency electromagnetic noise at the load end of the power plane can be respectively detected and suppressed, so that the electromagnetic radiation effect caused by the high-frequency electromagnetic noise is avoided. The power supply quality of the power plane is improved, and meanwhile the problems that a server is not started and is down and the like caused by high-frequency electromagnetic noise of the power supply are solved.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially implemented in the form of a software product, where the computer software product is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the methods described in the embodiments of the present application.

In this embodiment, an electromagnetic noise isolation apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and preferred embodiments, and the description of which has been already made is omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 10 is a block diagram of an electromagnetic noise isolation apparatus according to an embodiment of the present application, and as shown in fig. 10, the apparatus includes:

a first obtaining module 1002, configured to obtain a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, where the first power plane and the second power plane have two parallel connection paths therebetween, a first connection path of the two connection paths includes a switching device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, the electromagnetic noise detection circuit is configured to detect whether the first power plane and the second power plane generate electromagnetic noise, and the first level signal is used to indicate whether at least one of the first power plane and the second power plane generates electromagnetic noise;

a first control module 1004, configured to control, by a switch control circuit, the switch device to switch from an on state to an off state when the switch device is in the on state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, where when the switch device is in the on state, the first power plane and the second power plane are connected through the first connection path, and when the switch device is in the off state, the first connection path is in the off state, and the electromagnetic noise isolation device is configured to isolate electromagnetic noise between the first power plane and the second power plane when the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, and when the switch device is in the off state.

Optionally, the apparatus further comprises:

a second obtaining module, configured to obtain a second level signal output by the electromagnetic noise detection circuit after the switching device is controlled to switch from the on state to the off state, where the second level signal is used to indicate whether at least one of the first power plane and the second power plane generates electromagnetic noise;

and a second control module, configured to control the switching device to switch from the off state to the on state when the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, where the first connection path is in the on state when the switching device is in the on state.

Optionally, the apparatus further comprises:

the first determining module is configured to, after obtaining a second level signal output by the electromagnetic noise detection circuit, determine that the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise when the second level signal includes level signals output by the electromagnetic noise detection circuit detected N times in succession and values of the level signals detected N times in succession are all first values, where N is a positive integer greater than or equal to 2, and the level signal whose value is the first value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise generated by the first power plane and the second power plane is not detected.

Optionally, the apparatus further comprises:

a second determining module, configured to, after obtaining a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, determine that the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise when the first level signal includes level signals output by the electromagnetic noise detection circuit detected M times in succession and values of the level signals detected M times in succession are both second values, where M is a positive integer greater than or equal to 2, and the level signal whose value is the second value is a level signal output by the electromagnetic noise detection circuit when at least one of the first power plane and the second power plane generates electromagnetic noise is detected; or

A third determining module, configured to determine that the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, if the first level signal is a level signal taking the second value.

Optionally, the apparatus further comprises:

a detection module, configured to detect, by an electromagnetic noise detection circuit, whether there is a voltage difference between a first power plane and a second power plane when the first power plane and the second power plane are set to be power planes with the same voltage before acquiring a first level signal output by the electromagnetic noise detection circuit between the first power plane and the second power plane;

a fourth determining module, configured to determine that neither the first power plane nor the second power plane generates the electromagnetic noise when a voltage difference between the first power plane and the second power plane is not detected, and output a level signal with a first value through the electromagnetic noise detecting circuit;

a fifth determining module, configured to determine that at least one of the first power plane and the second power plane generates the electromagnetic noise when detecting that a voltage difference exists between the first power plane and the second power plane, and output, by the electromagnetic noise detecting circuit, a level signal having a second value, where the first value is different from the second value;

the first level signal includes the level signal taking the value as the first value or the level signal taking the value as the second value.

It should be noted that the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in different processors in any combination.

Embodiments of the present application further provide a computer-readable storage medium having a computer program stored therein, wherein the computer program is configured to perform the steps in any of the above method embodiments when executed.

In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to: various media capable of storing computer programs, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Embodiments of the present application further provide an electronic device comprising a memory having a computer program stored therein and a processor configured to execute the computer program to perform the steps in any of the above method embodiments.

In an exemplary embodiment, the electronic device may further include a transmission device and an input/output device, wherein the transmission device is connected to the processor, and the input/output device is connected to the processor.

For specific examples in this embodiment, reference may be made to the examples described in the foregoing embodiments and exemplary implementations, and details of this embodiment are not repeated herein.

It will be apparent to those skilled in the art that the modules or steps of the embodiments of the present application described above may be implemented by a general purpose computing device, they may be centralized in a single computing device or distributed across a network of multiple computing devices, and they may be implemented by program code executable by the computing device, such that they may be stored in a memory device and executed by the computing device, and in some cases, the steps shown or described may be executed in an order different from that described herein, or they may be separately fabricated as individual integrated circuit modules, or multiple modules or steps therein may be fabricated as a single integrated circuit module. Thus, embodiments of the present application are not limited to any specific combination of hardware and software.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the embodiment by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the principle of the embodiments of the present application shall be included in the protection scope of the embodiments of the present application.

Claims

1. An electromagnetic noise isolation method, comprising:

acquiring a first level signal output by an electromagnetic noise detection circuit between a first power plane and a second power plane, wherein the first power plane and the second power plane are connected in parallel through two connection paths, a first connection path of the two connection paths comprises a switch device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, the electromagnetic noise detection circuit is used for detecting whether the first power plane and the second power plane generate electromagnetic noise, and the first level signal is used for indicating whether at least one of the first power plane and the second power plane generates electromagnetic noise;

and under the condition that the switching device is in a conducting state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, controlling the switching device to be switched from the conducting state to a disconnecting state, and performing electromagnetic noise isolation between the first power plane and the second power plane through the electromagnetic noise isolation device, wherein when the switching device is in the conducting state, the first power plane and the second power plane are connected through the first connection path, and when the switching device is in the disconnecting state, the first connection path is in the disconnecting state.

2. The method of claim 1, wherein after said controlling the switching device to switch from the on state to the off state, the method further comprises:

acquiring a second level signal output by the electromagnetic noise detection circuit, wherein the second level signal is used for indicating whether at least one of the first power plane and the second power plane generates electromagnetic noise;

and controlling the switching device to switch from the off state to the on state in a case where the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, wherein the first connection path is in the on state when the switching device is in the on state.

3. The method of claim 2, wherein after said obtaining the second level signal output by the electromagnetic noise detection circuit, the method further comprises:

and under the condition that the second level signal comprises level signals output by the electromagnetic noise detection circuit and detected for N times continuously, and the values of the level signals detected for N times continuously are both first values, determining that the second level signal indicates that the first power plane and the second power plane do not generate electromagnetic noise, wherein N is a positive integer greater than or equal to 2, and the level signal with the first value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise is not detected by the first power plane and the second power plane.

4. The method of claim 1, wherein after said obtaining the first level signal output by the electromagnetic noise detection circuit between the first power plane and the second power plane, the method further comprises:

when the first level signal comprises level signals output by the electromagnetic noise detection circuit and detected for M times continuously, and values of the level signals detected for M times continuously are all second values, determining that the first level signal represents that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein M is a positive integer greater than or equal to 2, and the level signal with the second value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise generated by at least one of the first power plane and the second power plane is detected; or

Determining that the first level signal is indicative of electromagnetic noise generated by at least one of the first power plane and the second power plane, in a case where the first level signal is a level signal taking the second value.

5. The method of claim 1, wherein prior to said obtaining the first level signal output by the electromagnetic noise detection circuit between the first power plane and the second power plane, the method further comprises:

detecting, by the electromagnetic noise detection circuit, whether there is a voltage difference between the first power plane and the second power plane in a case where the first power plane and the second power plane are set to be power planes of the same voltage;

under the condition that a voltage difference between the first power plane and the second power plane is not detected, determining that the electromagnetic noise is not generated by the first power plane and the second power plane, and outputting a level signal with a first value through the electromagnetic noise detection circuit;

under the condition that a voltage difference exists between the first power plane and the second power plane, determining that at least one of the first power plane and the second power plane generates the electromagnetic noise, and outputting a level signal with a second value through the electromagnetic noise detection circuit, wherein the first value is different from the second value;

6. An electromagnetic noise isolation circuit, comprising:

the power supply circuit comprises a first power plane and a second power plane, wherein two parallel connection paths are arranged between the first power plane and the second power plane, a first connection path of the two connection paths comprises a switch device, a second connection path of the two connection paths is provided with an electromagnetic noise isolation device, and the electromagnetic noise isolation device is used for performing electromagnetic noise isolation between the first power plane and the second power plane;

an electromagnetic noise detection circuit connected to the first power plane and the second power plane, the electromagnetic noise detection circuit configured to detect whether the first power plane and the second power plane generate electromagnetic noise;

and the switch control circuit is connected with the switch device and used for controlling the switch device to be switched from the on state to the off state under the condition that the switch device is in the on state and a first level signal output by the electromagnetic noise detection circuit indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, wherein when the switch device is in the on state, the first power plane and the second power plane are connected through the first connecting path, and when the switch device is in the off state, the first connecting path is in the off state and performs electromagnetic noise isolation between the first power plane and the second power plane through the electromagnetic noise isolation device.

7. The circuit of claim 6, further comprising:

8. The circuit of claim 7, wherein the control chip is further configured to receive a second level signal output by the electromagnetic noise detection circuit, and output a second control signal to the switch control circuit when the second level signal indicates that neither the first power plane nor the second power plane generates electromagnetic noise, wherein the second control signal is configured to control the switching device to switch from the off state to the on state through the switch control circuit, and wherein the first connection path is in the on state when the switching device is in the on state.

9. The circuit of claim 8, wherein the control chip is further configured to determine whether the second level signal indicates that neither the first power plane nor the second power plane is generating electromagnetic noise by:

and under the condition that the second level signal comprises a level signal output by the electromagnetic noise detection circuit and continuously detected by the control chip for N times, and the values of the level signal continuously detected for N times are both a first value, determining that the second level signal indicates that the first power plane and the second power plane do not generate electromagnetic noise, wherein N is a positive integer greater than or equal to 2, and the level signal with the first value is a level signal output by the electromagnetic noise detection circuit when the electromagnetic noise is not detected by the first power plane and the second power plane.

10. The circuit of claim 6, wherein in a case where the first power plane and the second power plane are set to be power planes of the same voltage, the electromagnetic noise detection circuit further comprises:

a voltage difference detection device connected to the first power plane and the second power plane, the voltage difference detection device being configured to detect whether a voltage difference exists between the first power plane and the second power plane;

a signal output circuit connected to the voltage difference detection device, the signal output circuit being configured to output a level signal having a first value when a voltage difference between the first power plane and the second power plane is not detected, where the level signal having the first value indicates that neither the first power plane nor the second power plane generates the electromagnetic noise; outputting a level signal taking a second value when a voltage difference between the first power plane and the second power plane is detected, wherein the first value is different from the second value, and the level signal taking the second value indicates that at least one of the first power plane and the second power plane generates the electromagnetic noise;

the first level signal includes the level signal taking the first value or the level signal taking the second value.

11. A circuit according to any of claims 6 to 10, characterized in that the electromagnetic noise isolation means comprises a magnetic bead or an electromagnetic compatible EMC inductance.

12. An electromagnetic noise isolation device, comprising:

a first control module, configured to control, by a switch control circuit, the switch device to switch from an on state to an off state when the switch device is in the on state and the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise, where the first power plane and the second power plane are connected through the first connection path when the switch device is in the on state, and the first connection path is in the off state when the switch device is in the off state, and the electromagnetic noise isolation device is configured to isolate electromagnetic noise between the first power plane and the second power plane when the first level signal indicates that at least one of the first power plane and the second power plane generates electromagnetic noise and the switch device is in the off state.

13. A computer-readable storage medium, in which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.

14. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method as claimed in any of claims 1 to 5 are implemented when the computer program is executed by the processor.