Method, device and equipment for evaluating PCB high-speed connector pad parameters and readable medium

文档序号：49488 发布日期：2021-09-28 浏览：29次中文

阅读说明：本技术 评估pcb高速连接器焊盘参数方法、装置、设备及可读介质 (Method, device and equipment for evaluating PCB high-speed connector pad parameters and readable medium ) 是由赖修樟于 2021-05-15 设计创作，主要内容包括：本发明提供了一种评估PCB高速连接器焊盘参数的方法、装置、设备及可读介质,该方法包括：将多个不同输入参数的焊盘进行仿真,并记录每个焊盘输入参数和对应的仿真结果；将每个焊盘输入参数和仿真结果进行统计分析以得到输入参数和仿真结果的关系式；基于关系式建立PCB高速连接器焊盘评估工具；将待评估的焊盘输入参数输入到工具中进行评估。通过使用本发明的方案,能够不需反复建立PCB连接器焊盘的3D模型以及执行仿真,节省了大量的时间和人力,加速PCB高速连接器焊盘设计的优化,PCB高速连接器焊盘评估工具操作容易并且结果准确。(The invention provides a method, a device, equipment and a readable medium for evaluating parameters of a PCB high-speed connector pad, wherein the method comprises the following steps: simulating a plurality of bonding pads with different input parameters, and recording each bonding pad input parameter and a corresponding simulation result; performing statistical analysis on the input parameters and the simulation results of each bonding pad to obtain a relational expression of the input parameters and the simulation results; establishing a PCB high-speed connector pad evaluation tool based on the relational expression; and inputting the input parameters of the bonding pads to be evaluated into the tool for evaluation. By using the scheme of the invention, the 3D model of the PCB connector pad does not need to be repeatedly established and simulation is not needed to be executed, a large amount of time and manpower are saved, the optimization of the PCB high-speed connector pad design is accelerated, and the operation of the PCB high-speed connector pad evaluation tool is easy and the result is accurate.)

1. A method for evaluating parameters of a PCB high-speed connector pad, comprising the steps of:

simulating a plurality of bonding pads with different input parameters, and recording each bonding pad input parameter and a corresponding simulation result;

performing statistical analysis on the input parameters and the simulation results of each bonding pad to obtain a relational expression of the input parameters and the simulation results;

establishing a PCB high-speed connector pad evaluation tool based on the relational expression;

and inputting the input parameters of the bonding pads to be evaluated into the tool for evaluation.

2. The method of claim 1, wherein the input parameters include a pad down gouging length, a pad down gouging width, a pad down gouging depth, a pad length, a pad width, a pad pitch, a dielectric constant of a printed circuit board material, and a dissipation factor of a printed circuit board material.

3. The method of claim 1, wherein the simulation results include impedance and loss of the pad.

4. The method of claim 1, wherein simulating a plurality of pads with different input parameters and recording each pad input parameter and corresponding simulation results comprises:

combining the length of the hole dug below the bonding pad, the width of the hole dug below the bonding pad, the depth of the hole dug below the bonding pad, the length of the bonding pad, the width of the bonding pad, the space between the bonding pads, the dielectric constant of the printed circuit board material and the loss factor of the printed circuit board material into an input parameter group, modifying a data value in the input parameter group, inputting the data value into HFSS 3D simulation software for simulation, and recording a simulation result;

and repeating the steps until the threshold number of times of simulation is performed.

5. The method of claim 1, wherein statistically analyzing the input parameters and the simulation results for each pad to obtain a relationship between the input parameters and the simulation results comprises:

6. The method of claim 1, wherein building a PCB high speed connector pad evaluation tool based on the relationship comprises:

establishing an input cell for inputting parameters and an output cell for simulating results in a table;

writing an Excel formula based on the relational expression, and referring to the input cell according to the content in the formula.

7. The method of claim 1, wherein inputting pad input parameters to be evaluated into the tool for evaluation comprises:

inputting pad input parameters to be evaluated into the tool to obtain a simulation result, and judging whether the simulation result meets the requirement;

in response to the simulation result not meeting the requirement, adjusting pad input parameters input into the tool until the simulation result meets the requirement.

8. An apparatus for evaluating pad parameters of a PCB high speed connector, the apparatus comprising:

the simulation module is configured to simulate a plurality of pads with different input parameters and record each pad input parameter and a corresponding simulation result;

the analysis module is configured to perform statistical analysis on the input parameters and the simulation results of each bonding pad to obtain a relational expression of the input parameters and the simulation results;

a creation module configured to build a PCB high speed connector pad evaluation tool based on the relational expression;

an evaluation module configured to input pad input parameters to be evaluated into the tool for evaluation.

9. A computer device, comprising:

at least one processor; and

a memory storing computer instructions executable on the processor, the instructions when executed by the processor implementing the steps of the method of any one of claims 1 to 7.

10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.

Technical Field

The field relates to the field of computers, and more particularly to a method, device, equipment and readable medium for evaluating pad parameters of a PCB high-speed connector.

Background

With the development of the fifth generation mobile communication technology and industry, the high-speed signal design of the application IC is becoming more and more important to meet the requirements of people for high-speed data transmission and huge bandwidth, and besides the requirement for material loss of the PCB (printed circuit board), the importance of continuous impedance of the signal transmission process is also becoming higher and higher, and impedance matching means that the signal power is transmitted from the signal source to the attached load end most effectively, so that the signal is not reflected as much as possible in the transmission process. If the impedance mismatch occurs, reflection occurs, which may cause adverse effects such as incomplete transmission of energy and signals, and radiation interference.

In high speed PCB (printed circuit board) designs, it is often necessary to use high speed connectors to transfer signals from one PCB to another. Nowadays, SMT (Surface Mount Technology) is mostly used for high-speed connector pads (pads), and the SMT Pad is relatively larger than the trace width, so that a hole (Void) needs to be dug below the signal Pad to reduce excessive capacitance to achieve impedance matching. In order to reduce the reflection caused by impedance discontinuity as much as possible, it is usually necessary to draw the structure of the PCB connector Pad (Pad) by using 3D simulation software, perform 3D simulation to obtain the relevant value of the connector Pad (Pad), and then change the Void (hole digging) under the Pad for optimization, but each drawing and simulation consumes a lot of manpower and time.

Disclosure of Invention

In view of the above, an object of the embodiments of the present invention is to provide a method, an apparatus, a device and a readable medium for evaluating parameters of a pad of a PCB high-speed connector, which can save a lot of time and manpower, accelerate optimization of the pad design of the PCB high-speed connector, and facilitate operation of a tool for evaluating the pad of the PCB high-speed connector with accurate results without repeatedly establishing a 3D model of the pad of the PCB connector and performing simulation.

In view of the above objects, an aspect of the embodiments of the present invention provides a method for evaluating pad parameters of a PCB high-speed connector, comprising the steps of:

simulating a plurality of bonding pads with different input parameters, and recording each bonding pad input parameter and a corresponding simulation result;

performing statistical analysis on the input parameters and the simulation results of each bonding pad to obtain a relational expression of the input parameters and the simulation results;

establishing a PCB high-speed connector pad evaluation tool based on the relational expression;

and inputting the input parameters of the bonding pads to be evaluated into the tool for evaluation.

According to one embodiment of the invention, the input parameters include a pad under-scoop length, a pad under-scoop width, a pad under-scoop depth, a pad length, a pad width, a pad pitch, a dielectric constant of the printed circuit board material, and a dissipation factor of the printed circuit board material.

According to one embodiment of the invention, the simulation results include the impedance and loss of the pad.

According to an embodiment of the present invention, simulating a plurality of pads with different input parameters, and recording each pad input parameter and a corresponding simulation result includes:

and repeating the steps until the threshold number of times of simulation is performed.

According to an embodiment of the present invention, statistically analyzing the input parameters and the simulation results of each pad to obtain the relationship between the input parameters and the simulation results comprises:

According to one embodiment of the invention, the relational building PCB high-speed connector pad evaluation tool comprises:

establishing an input cell for inputting parameters and an output cell for simulating results in a table;

writing an Excel formula based on the relational expression, and referencing the input cells according to the contents in the formula.

According to one embodiment of the invention, inputting the pad input parameters to be evaluated into the tool for evaluation comprises:

inputting pad input parameters to be evaluated into a tool to obtain a simulation result, and judging whether the simulation result meets the requirement;

in response to the simulation result not meeting the requirements, pad input parameters input into the tool are adjusted until the simulation result meets the requirements.

In another aspect of the embodiments of the present invention, there is also provided an apparatus for evaluating pad parameters of a PCB high-speed connector, the apparatus including:

the simulation module is configured to simulate a plurality of pads with different input parameters and record each pad input parameter and a corresponding simulation result;

the creation module is configured to establish a PCB high-speed connector pad evaluation tool based on the relational expression;

and the evaluation module is configured to input the input parameters of the bonding pads to be evaluated into the tool for evaluation.

In another aspect of an embodiment of the present invention, there is also provided a computer apparatus including:

at least one processor; and

a memory storing computer instructions executable on the processor, the instructions when executed by the processor implementing the steps of any of the methods described above.

In another aspect of the embodiments of the present invention, there is also provided a computer-readable storage medium storing a computer program, which when executed by a processor implements the steps of any one of the above-mentioned methods.

The invention has the following beneficial technical effects: according to the method for evaluating the parameters of the PCB high-speed connector pad, provided by the embodiment of the invention, a plurality of pads with different input parameters are simulated, and each pad input parameter and a corresponding simulation result are recorded; performing statistical analysis on the input parameters and the simulation results of each bonding pad to obtain a relational expression of the input parameters and the simulation results; establishing a PCB high-speed connector pad evaluation tool based on the relational expression; the technical scheme of inputting the input parameters of the bonding pad to be evaluated into the tool for evaluation can avoid repeatedly establishing a 3D model of the bonding pad of the PCB connector and executing simulation, save a large amount of time and manpower, accelerate the optimization of the design of the bonding pad of the PCB high-speed connector, and the tool for evaluating the bonding pad of the PCB high-speed connector is easy to operate and has accurate results.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.

FIG. 1 is a schematic flow chart diagram of a method of evaluating PCB high speed connector pad parameters according to one embodiment of the present invention;

FIG. 2 is a diagram of input parameters and simulation results according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of a relational expression according to one embodiment of the invention;

FIG. 4 is a schematic diagram of a PCB high speed connector pad structure according to one embodiment of the present invention;

FIG. 5 is a schematic diagram of an apparatus for evaluating pad parameters of a PCB high-speed connector according to one embodiment of the invention;

FIG. 6 is a schematic diagram of a computer device according to one embodiment of the present invention;

fig. 7 is a schematic diagram of a computer-readable storage medium according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.

In view of the above objects, a first aspect of embodiments of the present invention proposes an embodiment of a method for evaluating pad parameters of a PCB high-speed connector. Fig. 1 shows a schematic flow diagram of the method.

As shown in fig. 1, the method may include the steps of:

s1, simulating a plurality of pads with different input parameters, and recording each pad input parameter and the corresponding simulation result.

The input parameters may include the length of a hole below a pad, the width of the hole below the pad, the depth of the hole below the pad, the length of the pad, the width of the pad, the pitch of the pad, the dielectric constant of a printed circuit board material, and the loss factor of the printed circuit board material, and these parameters may form a set of input parameters, modify the data values in the input parameter set and input the modified data values into HFSS 3D simulation software to perform simulation and record the simulation result, that is, the values of each set of input parameters and the corresponding simulation results need to be recorded, and repeat the above steps until the threshold number of times of simulation is performed, the threshold number of times may be set according to actual requirements, and in general, the more the number of times of simulation is, the more accurate the relation is obtained later, as shown in fig. 2, the input parameters of 128 times of simulation and the corresponding simulation results, that is, 128 different pad structures.

S2, performing statistical analysis on the input parameters and the simulation results of each pad to obtain a relational expression between the input parameters and the simulation results.

The input parameters and the simulation results of the plurality of pads obtained above are input into a JMP (statistical analysis software), the relationship between the input parameters and the simulation results and the specific gravity of each input parameter affecting the output results are analyzed, and finally the relational expression between the input parameters and the simulation results is obtained, as shown in fig. 3. By using the relational expression, a simulation result can be obtained from the input parameter values, and an accurate simulation result can be obtained even if other combinations of the input parameter values are not included in the simulation parameter group.

S3 building a PCB high-speed connector pad evaluation tool based on the relation.

The evaluation tool can use an Excel table, and an input cell of an input parameter and an output cell of a simulation result are established in the Excel table; writing an Excel formula on the output cell of the simulation result based on the relational expression, and referencing the corresponding input cell according to the content in the formula, so that the simulation result can be obtained in the output cell through the formula by inputting related parameters in the input cell.

S4 inputs the pad input parameters to be evaluated into the tool for evaluation.

After the evaluation tool is established, the combination of any parameter can be evaluated, the combination which is not in the simulation can also be evaluated, the input parameter of the bonding pad to be evaluated is input into the tool to obtain a simulation result, whether the simulation result meets the requirement or not is judged, the simulation result mainly comprises impedance and loss, and if the simulation result does not meet the requirement, the input parameter of the bonding pad input into the tool is adjusted until the simulation result meets the requirement.

By the technical scheme, repeated establishment of a 3D model of the PCB connector pad and execution of simulation are not needed, a large amount of time and labor are saved, optimization of the PCB high-speed connector pad design is accelerated, and the PCB high-speed connector pad evaluation tool is easy to operate and accurate in result.

In a preferred embodiment of the invention, the input parameters include the length of the cutout below the bonding pad, the width of the cutout below the bonding pad, the depth of the cutout below the bonding pad, the length of the bonding pad, the width of the bonding pad, the pitch of the bonding pad, the dielectric constant of the printed circuit board material and the dissipation factor of the printed circuit board material. Fig. 4 shows the positions of these parameters in the pads, and a pair of high-speed differential line connector pads (Pad) in a Printed Circuit Board (PCB) mainly contains four pads, a first Pad SIG _ P (signal Pad 1), a second Pad SIG _ N (signal Pad 2), a third Pad GND _1 (ground Pad 1), and a fourth Pad GND _2 (ground Pad 2), and the parameters are described as follows: void _ L is the length (unit: mil) of the hole dug below the bonding Pad, Void _ W is the width (unit: mil) of the hole dug below the bonding Pad, Void _ H is the depth (unit: mil) of the hole dug below the bonding Pad, Pad _ L is the length (unit: mil) of the bonding Pad, Pad _ W is the width (unit: mil) of the bonding Pad, Pad _ Pitch is the Pitch of the bonding Pad (between SIG _ P and SIG _ N, between SIG _ P and GND _1, between SIG _ N and GND _ 2), Dk is the dielectric constant of the printed circuit board material, and Df is the loss factor of the printed circuit board material.

In a preferred embodiment of the invention, the simulation results include the impedance and loss of the pad.

In a preferred embodiment of the present invention, simulating a plurality of pads with different input parameters, and recording each pad input parameter and a corresponding simulation result comprises:

and repeating the steps until the threshold number of times of simulation is performed. The threshold times can be set according to actual requirements, and in general, the more the simulation times, the more accurate the relation obtained later.

In a preferred embodiment of the present invention, statistically analyzing the input parameters and the simulation results for each pad to obtain the relationship between the input parameters and the simulation results comprises:

and inputting the input parameters and the simulation results of each bonding pad into JMP statistical analysis software for analysis to obtain a relational expression of the input parameters and the simulation results. Inputting the input parameters and simulation results of the plurality of bonding pads into JMP (statistical analysis software), analyzing the relationship between the input parameters and the simulation results and the proportion of each input parameter influencing the output results, and finally obtaining the relational expression between the input parameters and the simulation results. By using the relational expression, a simulation result can be obtained from the input parameter values, and an accurate simulation result can be obtained even if other combinations of the input parameter values are not included in the simulation parameter group.

In a preferred embodiment of the present invention, the relational build PCB high speed connector pad evaluation tool comprises:

establishing an input cell for inputting parameters and an output cell for simulating results in a table;

writing an Excel formula based on the relational expression, and referencing the input cells according to the contents in the formula. The evaluation tool can use an Excel table, and an input cell of an input parameter and an output cell of a simulation result are established in the Excel table; writing an Excel formula on the output cell of the simulation result based on the relational expression, and referencing the corresponding input cell according to the content in the formula, so that the simulation result can be obtained in the output cell through the formula by inputting related parameters in the input cell.

In a preferred embodiment of the present invention, inputting the pad input parameters to be evaluated into the tool for evaluation comprises:

inputting pad input parameters to be evaluated into a tool to obtain a simulation result, and judging whether the simulation result meets the requirement;

in response to the simulation result not meeting the requirements, pad input parameters input into the tool are adjusted until the simulation result meets the requirements. After the evaluation tool is established, the combination of any parameter can be evaluated, the combination which is not in the simulation can also be evaluated, the input parameter of the bonding pad to be evaluated is input into the tool to obtain a simulation result, whether the simulation result meets the requirement or not is judged, the simulation result mainly comprises impedance and loss, and if the simulation result does not meet the requirement, the input parameter of the bonding pad input into the tool is adjusted until the simulation result meets the requirement.

It should be noted that, as will be understood by those skilled in the art, all or part of the processes in the methods of the above embodiments may be implemented by instructing relevant hardware through a computer program, and the above programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the embodiments of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like. The embodiments of the computer program may achieve the same or similar effects as any of the above-described method embodiments.

Furthermore, the method disclosed according to an embodiment of the present invention may also be implemented as a computer program executed by a CPU, and the computer program may be stored in a computer-readable storage medium. The computer program, when executed by the CPU, performs the above-described functions defined in the method disclosed in the embodiments of the present invention.

In view of the above objects, according to a second aspect of the embodiments of the present invention, there is provided an apparatus for evaluating pad parameters of a PCB high-speed connector, as shown in fig. 5, the apparatus 200 includes:

and the simulation module is configured to simulate a plurality of pads with different input parameters and record each pad input parameter and a corresponding simulation result.

The input parameters can comprise the length of a hole dug below a bonding pad, the width of the hole dug below the bonding pad, the depth of the hole dug below the bonding pad, the length of the bonding pad, the width of the bonding pad, the space between the bonding pads, the dielectric constant of a printed circuit board material and the loss factor of the printed circuit board material, the parameters can form a group of input parameters, data values in the group of input parameters are modified and then input into HFSS 3D simulation software for simulation and recording simulation results, namely the values of each group of input parameters and corresponding simulation results need to be recorded, the steps are repeated until the threshold number of times of simulation is performed, the threshold number of times can be set according to actual requirements, the more simulation times are generally used, and the more accurate relationship is obtained later.

And the analysis module is configured to perform statistical analysis on the input parameters and the simulation results of each bonding pad to obtain a relational expression of the input parameters and the simulation results.

Inputting the input parameters and simulation results of the plurality of bonding pads into JMP (statistical analysis software), analyzing the relationship between the input parameters and the simulation results and the proportion of each input parameter influencing the output results, and finally obtaining the relational expression between the input parameters and the simulation results. By using the relational expression, a simulation result can be obtained from the input parameter values, and an accurate simulation result can be obtained even if other combinations of the input parameter values are not included in the simulation parameter group.

A creation module configured to build a PCB high speed connector pad evaluation tool based on the relational expression.

And the evaluation module is configured to input the input parameters of the bonding pads to be evaluated into the tool for evaluation.

In a preferred embodiment of the invention, the simulation results include the impedance and loss of the pad.

In a preferred embodiment of the invention, the simulation module is further configured to:

and repeating the steps until the threshold number of times of simulation is performed.

In a preferred embodiment of the invention, the analysis module is further configured to:

In a preferred embodiment of the present invention, the creation module is further configured to:

establishing an input cell for inputting parameters and an output cell for simulating results in a table;

writing an Excel formula based on the relational expression, and referencing the input cells according to the contents in the formula.

In a preferred embodiment of the invention, the evaluation module is further configured to:

inputting pad input parameters to be evaluated into a tool to obtain a simulation result, and judging whether the simulation result meets the requirement;

in response to the simulation result not meeting the requirements, pad input parameters input into the tool are adjusted until the simulation result meets the requirements.

In view of the above object, a third aspect of the embodiments of the present invention provides a computer device. Fig. 6 is a schematic diagram of an embodiment of a computer device provided by the present invention. As shown in fig. 6, the embodiment of the present invention includes the following means: at least one processor S21; and a memory S22, the memory S22 storing computer instructions S23 executable on the processor, the instructions when executed by the processor implementing the method of:

s1, simulating a plurality of pads with different input parameters, and recording each pad input parameter and the corresponding simulation result.

S2, performing statistical analysis on the input parameters and the simulation results of each pad to obtain a relational expression between the input parameters and the simulation results.

S3 building a PCB high-speed connector pad evaluation tool based on the relation.

S4 inputs the pad input parameters to be evaluated into the tool for evaluation.

In view of the above object, a fourth aspect of the embodiments of the present invention proposes a computer-readable storage medium. FIG. 7 is a schematic diagram illustrating an embodiment of a computer-readable storage medium provided by the present invention. As shown in fig. 7, the computer readable storage medium stores S31 a computer program that, when executed by a processor, performs the method as described above S32.

Furthermore, the methods disclosed according to embodiments of the present invention may also be implemented as a computer program executed by a processor, which may be stored in a computer-readable storage medium. Which when executed by a processor performs the above-described functions defined in the methods disclosed in embodiments of the invention.

Further, the above method steps and system elements may also be implemented using a controller and a computer readable storage medium for storing a computer program for causing the controller to implement the functions of the above steps or elements.

Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the disclosure herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as software or hardware depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments of the present invention.

In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. Also, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk, blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.

It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.

The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.

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