A calculation method and verification method for the powder material utilization rate of magnetic powder core for inductor

Abstract

The present invention discloses a method for calculating the powder material utilization ratio of magnetic powder cores for inductors and a method for verifying the same. The method comprises: 1. Analyzing and calculating the finished inductor using finite element analysis (FEM) based on the design parameters and slicing data of the finished inductor to obtain an estimated inductance value of the finished inductor with the design parameters and an estimated relative magnetic permeability of the magnetic powder core material used in actual production; 2. Calculating the powder material utilization ratio based on the relative magnetic permeability of the actual magnetic powder core material; 3. Calculating the estimated specifications of the finished inductor in actual production based on the rate of change of the finished inductor specifications; 4. Calculating the estimated relative magnetic permeability of the magnetic powder core material for the finished inductor with the design parameters and specifications corresponding to the finished inductor based on the FEM, and comparing the estimated relative magnetic permeability with the relative magnetic permeability of the magnetic powder core material actually used in production to evaluate the accuracy of the powder material utilization ratio. The present invention can use FEM to solve the problem of blindly selecting variables, thereby accurately guiding the selection of magnetic powder core materials for inductors.

Description

Technical Field

[0001] The present invention relates to the field of analysis and calculation of materials used in electronic components, and in particular to a method for calculating the powder material utilization rate of a magnetic powder core for inductance and a method for verifying the same. Background Art

[0002] As the application scope of inductors becomes wider and wider, the requirements for the electromagnetic performance of inductors are also getting higher and higher. They are usually required to have characteristics such as small size, high current resistance, wide operating frequency range, good DC bias resistance, and good magnetic shielding performance. The electromagnetic characteristics of inductors are mainly related to the structural parameters of the inductor and the electromagnetic parameters of the magnetic core material. Therefore, to achieve these high requirements, it is necessary not only to optimize the specifications of the inductor but also to make a reasonable selection of the magnetic powder core material used in the inductor. The selection of magnetic powder core materials for inductors is based on the inductance calculation formula combined with the inductance parameters. Since the magnetic flux distribution of the inductor in the electromagnetic field cannot be truly observed, the variables in the formula can only be determined based on experience under existing technology. In addition, in actual production, the relative magnetic permeability of the magnetic powder core of the final product inductor is inconsistent with the relative magnetic permeability data of the magnetic powder core used in actual production. This is caused by the fact that the magnetic powder cannot play its role 100%. Therefore, the selection of magnetic powder core materials for inductors using existing technology will result in inaccurate solutions due to the uncertainty of variables and powder material utilization rate. Although empirical values ​​are added for calculation when using existing technology, there is also blindness and randomness. In addition, the existing calculation method is not only inaccurate but also difficult to calculate. Summary of the Invention

[0003] The present invention aims to address the deficiencies of the above-mentioned prior art and proposes a method for calculating the powder material utilization rate of magnetic powder cores for inductors and a method for verifying the same, in order to utilize the finite element analysis method to solve the problem of blind selectivity of variables, thereby accurately guiding the selection of powder materials for magnetic powder cores for inductors, thereby making the method more practical, quick and accurate.

[0004] In order to achieve the above-mentioned object, the present invention adopts the following technical solutions:

[0005] The method for calculating the powder material utilization rate of a magnetic powder core for inductance of the present invention is characterized in that it includes the following steps:

[0006] S1. Determine the design parameters of the finished inductor to be produced, and collect the magnetic powder core material data, operating conditions, and test parameters used in the actual production of the finished inductor;

[0007] S2. Use equations (1) and (2) to calculate the magnetic path length of the finished inductor with the design parameter specifications under the electromagnetic field. and magnetic circuit cross-sectional area :

[0008] (1)

[0009] (2)

[0010] In formula (1) and formula (2), Indicates the number of layers of coil winding on the finished inductor with design parameter specifications. represents the height of a single coil, Indicates the total number of coils on the finished inductor with the design parameter specifications; Indicates the width of a single coil, It represents the magnetic circuit area at the center of the finished inductor with design parameter specifications. Indicates the magnetic circuit area of ​​the inductor A side, Indicates the magnetic circuit area of ​​the inductor B side, It represents the magnetic circuit area of ​​the rest of the finished inductor with the design parameter specifications;

[0011] S3. Use formula (3) to get the estimated inductance value of the finished inductor with the design parameter specifications :

[0012] (3)

[0013] In formula (3), Indicates the relative magnetic permeability of the actual magnetic powder core material used in the production of finished inductors with design parameter specifications;

[0014] S4. Slicing the finished inductor with the designed parameter specifications and measuring the specifications of the slices to obtain actual slice specification data of the finished inductor with the designed parameter specifications, and establishing a 3D model of the finished inductor with the slice specifications based on the actual slice specification data. Then, using the finite element analysis method, performing electromagnetic field analysis on the finished inductor with the slice specifications, and simulating the eddy current effect of the finished inductor during actual operation;

[0015] Based on the actual production conditions and test parameters, the finite element analysis method is used to perform meshing, current excitation, and boundary condition settings on the 3D model of the finished inductor with slice specifications;

[0016] S5. Use formula (4) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with slice specifications :

[0017] (4)

[0018] In formula (4), L1 represents the measured inductance value of the finished inductor with slice specifications, It indicates the magnetic path length of the finished inductor with slice specifications under the electromagnetic field. Indicates the magnetic circuit cross-sectional area of ​​the finished inductor with slice specifications under the electromagnetic field;

[0019] S6. Calculate the utilization rate K of the magnetic powder core powder using formula (5) m :

[0020] (5).

[0021] The method for calculating the powder material utilization rate of the magnetic powder core for inductors described in the present invention is also characterized in that the design parameters of the finished inductor in S1 include: the page swing length , Page width , Page thickness , center column length , center column width , Center column height , body length 、Body width , body height , coil width , coil height , the number of coil layers C, the total number of coil turns N; where, = + + , Indicates the distance between the center column and the A side of the inductor;

[0022] The magnetic powder core material data used in the actual production of the finished inductor is the actual relative magnetic permeability μ of the magnetic powder core material;

[0023] The working conditions and test parameters include: current excitation I and frequency f of current excitation.

[0024] Furthermore, in S2 、 、 、 It is calculated according to formula (6)-formula (9):

[0025] (6)

[0026] (7)

[0027] (8)

[0028] (9).

[0029] The actual slice specification data in S4 includes: page length , Page width , Page thickness , center column length , center column width , Center column height , body length 、Body width , body height , coil width , coil height ;in, , Indicates the distance between the center column of the finished inductor and the A side of the inductor.

[0030] The method for verifying the powder material utilization rate of a magnetic powder core for inductance of the present invention is characterized in that it includes the following steps:

[0031] S7. Based on the actual slice specification data and design parameters of the finished inductor with design parameter specifications, calculate the change rate K of the finished inductor specifications according to formulas (10) to (20), including: the change rate of the page pendulum length , the rate of change of the page width , the rate of change of the thickness of the page , the change rate of the middle column length , the rate of change of the width of the center column , the rate of change of the center column height , the rate of change of the body length , the rate of change of the body width , the rate of change of the body height , the rate of change of coil width , the rate of change of coil height :

[0032] (10)

[0033] (11)

[0034] (12)

[0035] (13)

[0036] (14)

[0037] (15)

[0038] (16)

[0039] (17)

[0040] (18)

[0041] (19)

[0042] (20)

[0043] S8. Based on the design parameters and the rate of change K of the finished inductor specifications, estimated specifications of the finished inductor during actual production are obtained, thereby establishing a 3D model of the finished inductor with the estimated specifications, and using the finite element analysis method to perform meshing, current excitation, and boundary condition setting on the 3D model of the finished inductor with the slice specifications;

[0044] S9. Use formula (21) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with estimated specifications ;

[0045] (twenty one)

[0046] In formula (21), Indicates the magnetic path length of a finished inductor with estimated specifications under an electromagnetic field. Indicates the magnetic circuit cross-sectional area of ​​a finished inductor with estimated specifications under electromagnetic field;

[0047] S10, according to formula (22), the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications is calculated. :

[0048] (twenty two)

[0049] S11, will and Compare to evaluate precision.

[0050] An electronic device of the present invention includes a memory and a processor, wherein the memory is used to store a program that supports the processor to execute the method, and the processor is configured to execute the program stored in the memory.

[0051] The present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program executes the steps of the method when executed by a processor.

[0052] Compared with the prior art, the present invention has the following beneficial effects:

[0053] 1. The existing technology for selecting magnetic powder core materials for inductors is based on calculation formulas combined with inductor parameters. However, since the magnetic flux distribution of the inductor in the electromagnetic field cannot be truly observed, some variables in the formula can only be selected based on experience. Therefore, the existing technology is blind and inaccurate in selecting magnetic powder core materials for inductors. The present invention uses finite element simulation analysis software to simulate the magnetic flux distribution of the inductor in the electromagnetic field. Based on the magnetic flux distribution, the finite element analysis method is used to accurately obtain the variables in the formula, thereby ensuring accuracy and rationality in the selection of magnetic powder core materials for inductors.

[0054] 2. In actual production, the relative magnetic permeability of the magnetic powder core of the finished inductor is inconsistent with the relative magnetic permeability data of the magnetic powder core calculated by the design parameters and actually applied. This is caused by the inability of the magnetic powder to fully play its role. When using existing technology to select the magnetic powder core material for the inductor, the uncertainty of the change between the true relative magnetic permeability of the magnetic powder core material and the relative magnetic permeability of the magnetic powder core of the finished inductor will lead to the selection of the magnetic powder core material for the inductor based on experience, which will lead to inaccurate selection of the magnetic powder core material for the inductor, so that the inductor performance cannot meet the requirements. The present invention combines the true relative magnetic permeability of the magnetic powder core material with the relative magnetic permeability of the magnetic powder core of the finished inductor, introduces the concept of powder material utilization rate, and can determine the change between the true relative magnetic permeability of the magnetic powder core material and the relative magnetic permeability of the magnetic powder core of the finished inductor, thereby accurately guiding the selection of magnetic powder core material for the inductor;

[0055] 3. Using existing methods to select magnetic powder core materials for inductors requires a large amount of calculation based on calculation formulas combined with inductor design parameters and finished inductor specifications to obtain empirical values ​​to guide the work. This processing of large amounts of data is prone to calculation errors and also requires a lot of time and manpower to verify the rationality of the design. However, the present invention introduces the concept of powder material utilization and combines it with finite element analysis to obtain a more accurate solution in a shorter time. Moreover, using a computer to perform a large number of calculations automatically not only eliminates the risk of calculation errors but also has very high calculation efficiency. At the same time, the verification of the rationality of the design can also be completed in a shorter time. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 Flow chart of the method of the present invention. DETAILED DESCRIPTION

[0057] In this embodiment, a method for calculating the powder material utilization rate of a magnetic powder core for an inductor is as follows: Figure 1 As shown, the following steps are included:

[0058] S1. Determine the design parameters of the finished inductor to be produced, and collect the magnetic powder core material data, operating conditions, and test parameters used in the actual production of the finished inductor;

[0059] The design parameters of the finished inductor include: page length , Page width , Page thickness , center column length , center column width , Center column height , body length 、Body width , body height , coil width , coil height , the number of coil layers C, the total number of coil turns N; where, = + + , Indicates the distance between the center column and the A side of the inductor;

[0060] The magnetic powder core material data used in the actual production of finished inductors is the actual relative magnetic permeability μ of the magnetic powder core material;

[0061] Working conditions and test parameters include: current excitation I=0.1A, current excitation frequency f=1MHz.

[0062] S2. Use equations (1) and (2) to calculate the magnetic path length of the finished inductor with the design parameter specifications under the electromagnetic field. and magnetic circuit cross-sectional area :

[0063] (1)

[0064] (2)

[0065] In formula (2) 、 、 、 Calculate according to formula (6)-formula (9):

[0066] (6)

[0067] (7)

[0068] (8)

[0069] (9)

[0070] In formula (1) and formula (2), It represents the magnetic circuit area at the center of the finished inductor with design parameter specifications. Indicates the magnetic circuit area of ​​the inductor A side, Indicates the magnetic circuit area of ​​the inductor B side, It represents the magnetic circuit area of ​​the rest of the finished inductor with design parameter specifications.

[0071] S3. Use formula (3) to get the estimated inductance value of the finished inductor with the design parameter specifications :

[0072] (3)

[0073] In formula (3), It represents the relative permeability of the actual magnetic powder core material used in the production of the finished inductor with the design parameter specifications. Using formula (3), it can be preliminarily verified that the relative permeability of the finished inductor with the design parameter specifications is Is the estimated inductance greater than the measured inductance when using a magnetic powder core material? ', estimated inductance value Compared with the measured inductance value 'High, also means that the powder material cannot play a hundred percent role, than 'Big problem.

[0074] S4. Slicing the finished inductor with the designed parameter specifications and measuring the specifications of the slices to obtain actual slice specification data of the finished inductor with the designed parameter specifications, and establishing a 3D model of the finished inductor with the slice specifications based on the actual slice specification data. Then, using the finite element analysis method, performing electromagnetic field analysis on the finished inductor with the slice specifications, and simulating the eddy current effect of the finished inductor during actual operation;

[0075] The actual slicing specifications include: page length , Page width , Page thickness , center column length , center column width , Center column height , body length 、Body width , body height , coil width , coil height ;in, , Indicates the distance between the center column of the finished inductor and the A side of the inductor.

[0076] Based on the actual production conditions and test parameters, the finite element analysis method is used to mesh the 3D model of the finished inductor with slice specifications, set AC current excitation and insulation boundary conditions;

[0077] S5. Use formula (4) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with slice specifications :

[0078] (4)

[0079] In formula (4), L1 represents the measured inductance value of the finished inductor with slice specifications, It indicates the magnetic path length of the finished inductor with slice specifications under the electromagnetic field. It represents the magnetic circuit cross-sectional area of ​​the finished inductor with slice specifications under the electromagnetic field. The variable parameters in formula (4) are obtained based on the slice specification data of the real finished inductor and calculated by finite element analysis method. The calculation results are highly accurate.

[0080] S6. Calculate the utilization rate K of the magnetic powder core powder using formula (5) m :

[0081] (5)

[0082] By introducing the concept of powder material utilization, the true relative magnetic permeability of the magnetic powder core material can be determined. Estimated relative permeability of the magnetic powder core material used in the actual production of finished inductors with sliced ​​specifications The changes between them can accurately guide the selection of magnetic powder core materials for inductors.

[0083] In this embodiment, a method for verifying the material utilization rate of a magnetic powder core for an inductor includes the following steps:

[0084] S7. Based on the actual slice specification data and design parameters of the finished inductor with design parameter specifications, calculate the change rate K of the finished inductor specifications according to formulas (10) to (20), including: the change rate of the page pendulum length , the rate of change of the page width , the rate of change of the thickness of the page , the change rate of the middle column length , the rate of change of the width of the center column , the rate of change of the center column height , the rate of change of the body length , the rate of change of the body width , the rate of change of the body height , the rate of change of coil width , the rate of change of coil height Based on the change rate K of the finished inductor specifications and the design parameters of the finished inductor, the estimated specifications of the finished inductor during actual production can be obtained:

[0085] (10)

[0086] (11)

[0087] (12)

[0088] (13)

[0089] (14)

[0090] (15)

[0091] (16)

[0092] (17)

[0093] (18)

[0094] (19)

[0095] (20)

[0096] S8. Based on the design parameters and the rate of change K of the finished inductor specifications, the estimated specifications of the finished inductor during actual production are obtained, thereby establishing a 3D model of the finished inductor with the estimated specifications, and using the finite element analysis method to mesh the 3D model of the finished inductor with the slice specifications, perform AC current excitation, and set insulation boundary conditions.

[0097] S9. Use formula (21) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with estimated specifications

[0098] (twenty one)

[0099] In formula (21), Indicates the magnetic path length of a finished inductor with estimated specifications under an electromagnetic field. Indicates the magnetic circuit cross-sectional area of ​​a finished inductor with estimated specifications under electromagnetic field;

[0100] S10, according to formula (22), the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications is calculated. :

[0101] (twenty two)

[0102] S11, will and Compare to evaluate precision.

[0103] In this embodiment, an electronic device includes a memory and a processor, wherein the memory is used to store a program that supports the processor to execute the above method, and the processor is configured to execute the program stored in the memory.

[0104] In this embodiment, a computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method are executed.

[0105] Example:

[0106] Taking the finished inductor with batch number LMSC20160652R2MTA as an example to calculate the powder material utilization rate, the actual relative magnetic permeability μ of the magnetic powder core material is 38.34, and the measured inductance value is The design parameters of the finished inductor are shown in Table 1, the actual slice specification data are shown in Table 2, and the calculated statistical table of the change rate K of the finished inductor specifications is shown in Table 3;

[0107] The finished inductor with batch number LMSC201208R33MTA is used as an example to verify the accuracy of the powder material utilization rate. The actual relative magnetic permeability of the magnetic powder core powder is 32.21, and the measured inductance value is The design parameters of the finished inductor are shown in Table 4, and the estimated specifications of the finished inductor during actual production are shown in Table 5.

[0108] surface Design parameters of finished inductors

[0109]

[0110] According to the design parameters of the finished inductor in Table 1, a 3D model of the finished inductor with the design parameter specifications is established, and the AC current excitation and insulation boundary conditions are set. The finite element analysis method is used for simulation analysis and calculation to obtain the estimated inductance value of the finished inductor with the design parameter specifications. , the estimated inductance value is higher than the measured inductance value.

[0111] surface Real slice specification data

[0112]

[0113] According to the actual slicing specification data in Table 2, a 3D model of the finished inductor with slicing specifications is established, and the AC current excitation and insulation boundary conditions are set. The finite element analysis method is used for simulation analysis and calculation to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with slicing specifications. =33.41;

[0114] Calculate the powder material utilization rate =0.8714.

[0115] Combining the data in Table 1 and Table 2, the change rate of the finished inductor specifications is calculated according to formula (10)-formula (20) and is statistically shown in Table 3;

[0116] surface Calculate the change rate K of the finished product inductance specifications

[0117]

[0118] surface Design parameters of finished inductors

[0119]

[0120] Based on the change rate K of the finished inductor specifications in Table 3 and combined with the design parameters of the finished inductor in Table 4, the estimated specifications of the finished inductor during actual production are calculated and summarized in Table 5.

[0121] surface Calculate the estimated specifications of the finished inductor during actual production

[0122]

[0123] According to the estimated specifications of the finished inductor in actual production obtained by calculation in Table 5, a 3D model of the finished inductor is established, and AC current excitation and insulation boundary conditions are set. The finite element analysis method is used for simulation analysis and calculation to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with the estimated specifications. =28.03;

[0124] Combined powder material utilization rate , using formula (22) to obtain the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications =32.17, and the relative error between it and the true relative permeability of the magnetic powder core material is only 0.124%. The accuracy is very high.

Claims

1. A method for calculating the powder material utilization rate of a magnetic powder core for inductors, characterized in that: The steps include: S1. Determine the design parameters of the finished inductor to be produced, and collect the magnetic powder core material data, operating conditions, and test parameters used in the actual production of the finished inductor; S2. Use equations (1) and (2) to calculate the magnetic path length of the finished inductor with the design parameter specifications under the electromagnetic field. and magnetic circuit cross-sectional area : (1) (2) In formula (1) and formula (2), Indicates the number of layers of coil winding on the finished inductor with design parameter specifications. represents the height of a single coil, Indicates the total number of coils on the finished inductor with the design parameter specifications; Indicates the width of a single coil, It represents the magnetic circuit area at the center of the finished inductor with design parameter specifications. Indicates the magnetic circuit area of ​​the inductor A side, Indicates the magnetic circuit area of ​​the inductor B side, It represents the magnetic circuit area of ​​the rest of the finished inductor with the design parameter specifications; S3. Use formula (3) to get the estimated inductance value of the finished inductor with the design parameter specifications : (3) In formula (3), Indicates the relative magnetic permeability of the actual magnetic powder core material used in the production of finished inductors with design parameter specifications; S4. Slicing the finished inductor with the designed parameter specifications and measuring the specifications of the slices to obtain actual slice specification data of the finished inductor with the designed parameter specifications, and establishing a 3D model of the finished inductor with the slice specifications based on the actual slice specification data. Then, using the finite element analysis method, performing electromagnetic field analysis on the finished inductor with the slice specifications, and simulating the eddy current effect of the finished inductor during actual operation; Based on the actual production conditions and test parameters, the finite element analysis method is used to perform meshing, current excitation, and boundary condition settings on the 3D model of the finished inductor with slice specifications; S5. Use formula (4) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with slice specifications : (4) In formula (4), L1 represents the measured inductance value of the finished inductor with slice specifications, It indicates the magnetic path length of the finished inductor with slice specifications under the electromagnetic field. Indicates the magnetic circuit cross-sectional area of ​​the finished inductor with slice specifications under the electromagnetic field; S6. Calculate the utilization rate K of the magnetic powder core powder using formula (5) m : (5)。 2. The method for calculating the powder material utilization rate of a magnetic powder core for inductance according to claim 1, characterized in that: The design parameters of the finished inductor in S1 include: , Page width , Page thickness , center column length , center column width , Center column height , body length 、Body width , body height , coil width , coil height , the number of coil layers C, the total number of coil turns N; where, = + + , Indicates the distance between the center column and the A side of the inductor; The magnetic powder core material data used in the actual production of the finished inductor is the relative magnetic permeability μ of the actual magnetic powder core material; The working conditions and test parameters include: current excitation I and frequency f of current excitation.

3. The method for calculating the powder material utilization rate of a magnetic powder core for inductance according to claim 2, characterized in that: In S2 、 、 、 It is calculated according to formula (6)-formula (9): (6) (7) (8) (9)。 4. The method for calculating the powder material utilization rate of a magnetic powder core for inductance according to claim 2, wherein: The actual slice specification data in S4 includes: page length , Page width , Page thickness , center column length , center column width , Center column height , body length 、Body width , body height , coil width , coil height ;in, , Indicates the distance between the center column of the finished inductor and the A side of the inductor.

5. A method for verifying the powder material utilization rate of a magnetic powder core for inductors, characterized in that: The method is applied to the calculation method as claimed in claim 4 and comprises the following steps: S7. Based on the actual slice specification data and design parameters of the finished inductor with design parameter specifications, calculate the change rate K of the finished inductor specifications according to formulas (10) to (20), including: the change rate of the page pendulum length , the rate of change of the page width , the rate of change of the thickness of the page , the change rate of the middle column length , the rate of change of the width of the center column , the rate of change of the center column height , the rate of change of the body length , the rate of change of the body width , the rate of change of the body height , the rate of change of coil width , the rate of change of coil height : (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) S8. Based on the design parameters and the rate of change K of the finished inductor specifications, estimated specifications of the finished inductor during actual production are obtained, thereby establishing a 3D model of the finished inductor with the estimated specifications, and using finite element analysis to perform meshing, current excitation, and boundary condition setting on the 3D model of the finished inductor with the slice specifications; S9. Use formula (21) to obtain the estimated relative permeability of the magnetic powder core material used in the actual production of the finished inductor with estimated specifications ; (21) In formula (21), Indicates the magnetic path length of a finished inductor with estimated specifications under an electromagnetic field. Indicates the magnetic circuit cross-sectional area of ​​a finished inductor with estimated specifications under electromagnetic field; S10, according to formula (22), the estimated relative permeability of the magnetic powder core material for the finished inductor with the estimated specifications corresponding to the design parameter specifications is calculated. : (22) S11, will and Compare to evaluate precision.

6. An electronic device comprising a memory and a processor, characterized in that: The memory is used to store a program that supports a processor to execute the method according to any one of claims 1 to 5, and the processor is configured to execute the program stored in the memory.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are performed.

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