Working frequency determination method and device, medium and program product

Abstract

The invention provides a working frequency determination method and device, a medium and a program product. Relates to the technical field of wireless transmission. The method is applied to the wireless electric energy transmission system and comprises the steps that a first response function and a second response function of the wireless electric energy transmission system are obtained, and the first response function represents the relation between parasitic resistance and working frequency of a coil in the wireless electric energy transmission system; the second response function represents the relationship between the parasitic resistance of the capacitor in the wireless power transmission system and the working frequency; determining a target mesh current equation according to the first response function, the second response function and an equivalent circuit model corresponding to the wireless power transmission system; and determining the actual working frequency of the wireless power transmission system according to the target mesh current equation. According to the invention, the effect of improving the wireless power transmission efficiency and precision is achieved.

Description

Technical Field

[0001] The present application relates to the field of wireless transmission technologies, and in particular, to a method, device, medium, and program product for determining a working frequency. Background Art

[0002] In magnetic coupling wireless power transmission, energy transfer relies on electromagnetic induction between coils. Determining an appropriate working frequency is of great significance for improving the efficiency of magnetic coupling wireless power transmission.

[0003] In related technologies, by the influence of the coil parasitic resistance on the working frequency, and then determining the working frequency adopted in magnetic coupling wireless power transmission, there are problems of long time consumption and poor parameter coupling.

[0004] Based on this, there is an urgent need for a working frequency determination scheme for a wireless power transmission system with high efficiency and high precision. Summary of the Invention

[0005] The present application provides a method, device, medium, and program product for determining a working frequency, so as to achieve the effect of improving the efficiency and precision of wireless power transmission.

[0006] In a first aspect, the present application provides a method for determining a working frequency, which is applied to a wireless power transmission system and includes:

[0007] Obtain a first response function and a second response function of the wireless power transmission system, where the first response function represents the relationship between the parasitic resistance of the coil in the wireless power transmission system and the working frequency; the second response function represents the relationship between the parasitic resistance of the capacitor in the wireless power transmission system and the working frequency;

[0008] Determine a target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transmission system;

[0009] Determine the actual working frequency of the wireless power transmission system according to the target mesh current equation.

[0010] In a possible implementation manner, determining a target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transmission system includes:

[0011] Add the first response function and the second response function to obtain a third response function; the third response function represents the relationship between the total parasitic resistance in the wireless power transmission system and the working frequency, and the total parasitic resistance includes the parasitic resistance of the coil and the parasitic resistance of the capacitor;

[0012] Determine the mesh current and output voltage of each mesh in the equivalent circuit model;

[0013] Determine the target mesh current equation according to the third response function, the mesh current of each mesh, and the output voltage.

[0014] In a possible implementation manner, determining the target mesh current equation according to the third response function, the mesh current of each mesh, and the output voltage includes:

[0015] Obtain an initial mesh current equation including an impedance matrix according to the mesh current of each mesh and the output voltage;

[0016] Replace the impedance matrix with the third response function to obtain the target mesh current equation.

[0017] In a possible implementation manner, determining the actual operating frequency of the wireless power transmission system according to the target mesh current equation includes:

[0018] Solve the target mesh current equation to determine the first relationship function between the mesh current and the operating frequency in the wireless power transmission system;

[0019] Determine the second relationship function between the transmission efficiency and the operating frequency in the wireless power transmission system according to the first relationship function and the efficiency determination formula;

[0020] Determine the number of frequency extreme points according to the second relationship function;

[0021] Determine the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points.

[0022] In a possible implementation manner, determining the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points includes:

[0023] When the number of frequency extreme points is 1, determine the operating frequency corresponding to the frequency extreme point as the actual operating frequency of the wireless power transmission system;

[0024] When the number of frequency extreme points is multiple, determine the operating frequency corresponding to the target frequency extreme point as the actual operating frequency of the wireless power transmission system; wherein, the target frequency extreme point is the frequency extreme point with the maximum transmission efficiency among the multiple frequency extreme points.

[0025] In a possible implementation manner, obtaining the first response function and the second response function of the wireless power transmission system includes:

[0026] At a preset operating frequency, obtain the parasitic resistance of the coil and the parasitic resistance of the capacitor in the wireless power transmission system; the preset operating frequency includes multiple different operating frequencies;

[0027] Based on the function fitting method and the parasitic resistance of the coil at the preset operating frequency, establish the relationship between the parasitic resistance of the coil and the operating frequency to obtain the first response function; and,

[0028] Based on the function fitting method and the parasitic resistance of the capacitor at the preset operating frequency, establish the relationship between the parasitic resistance of the capacitor and the operating frequency to obtain the second response function.

[0029] In a possible implementation manner, obtaining the parasitic resistance of the capacitor in the wireless power transfer system includes:

[0030] At the preset operating frequency, obtain the capacitance value range corresponding to the capacitor that resonates with the coil;

[0031] Calculate the average value of the maximum capacitance value and the minimum capacitance value within the capacitance value range;

[0032] Determine the average value as the target capacitor;

[0033] Measure the parasitic resistance of the target capacitor at the preset operating frequency, and determine the parasitic resistance of the capacitor in the wireless power transfer system as the parasitic resistance of the target capacitor.

[0034] In a second aspect, the present application provides a device for determining the operating frequency, which is applied to a wireless power transfer system and includes:

[0035] An acquisition module, configured to acquire the first response function and the second response function of the wireless power transfer system, where the first response function represents the relationship between the parasitic resistance of the coil in the wireless power transfer system and the operating frequency; the second response function represents the relationship between the parasitic resistance of the capacitor in the wireless power transfer system and the operating frequency;

[0036] A processing module, configured to determine a target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transfer system; and determine the actual operating frequency of the wireless power transfer system according to the target mesh current equation.

[0037] In a possible implementation manner, the processing module is specifically configured to:

[0038] Add the first response function and the second response function to obtain a third response function; the third response function represents the relationship between the total parasitic resistance in the wireless power transfer system and the operating frequency, and the total parasitic resistance includes the parasitic resistance of the coil and the parasitic resistance of the capacitor;

[0039] Determine the mesh current and output voltage of each mesh in the equivalent circuit model;

[0040] Determine the target mesh current equation according to the third response function, the mesh current of each mesh, and the output voltage.

[0041] In a possible implementation manner, the processing module is further configured to:

[0042] Obtain an initial mesh current equation including an impedance matrix according to the mesh current and output voltage of each mesh;

[0043] Replace the impedance matrix with a third response function to obtain a target mesh current equation.

[0044] In a possible implementation manner, the processing module is specifically configured to:

[0045] Solve the target mesh current equation to determine a first relationship function between the mesh current and the operating frequency in the wireless power transmission system;

[0046] Determine a second relationship function between the transmission efficiency and the operating frequency in the wireless power transmission system according to the first relationship function and the efficiency determination formula;

[0047] Determine the number of frequency extreme points according to the second relationship function;

[0048] Determine the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points.

[0049] In a possible implementation manner, the processing module is further configured to:

[0050] When the number of frequency extreme points is 1, determine the operating frequency corresponding to the frequency extreme point as the actual operating frequency of the wireless power transmission system;

[0051] When the number of frequency extreme points is multiple, determine the operating frequency corresponding to the target frequency extreme point as the actual operating frequency of the wireless power transmission system; wherein, the target frequency extreme point is the frequency extreme point with the maximum transmission efficiency among the multiple frequency extreme points.

[0052] In a possible implementation manner, the obtaining module is specifically configured to:

[0053] Obtain the parasitic resistance of the coil and the parasitic resistance of the capacitor in the wireless power transmission system at a preset operating frequency; the preset operating frequency includes multiple different operating frequencies;

[0054] Based on the function fitting method and the parasitic resistance of the coil at the preset operating frequency, construct the relationship between the parasitic resistance of the coil and the operating frequency to obtain a first response function; and,

[0055] Based on the function fitting method and the parasitic resistance of the capacitor at the preset operating frequency, construct the relationship between the parasitic resistance of the capacitor and the operating frequency to obtain a second response function.

[0056] In a possible implementation manner, the obtaining module is further configured to:

[0057] At a preset operating frequency, obtain the capacitance value range corresponding to the capacitance that resonates with the coil;

[0058] Calculate the average value of the maximum capacitance value and the minimum capacitance value within the capacitance value range;

[0059] Determine the average value as the target capacitance;

[0060] Measure the parasitic resistance of the target capacitance at the preset operating frequency, and determine the parasitic resistance of the capacitance in the wireless power transmission system as the parasitic resistance of the target capacitance.

[0061] In a third aspect, the present application provides an electronic device, including: a memory, a processor;

[0062] The memory stores computer-executable instructions;

[0063] The processor executes the computer-executable instructions stored in the memory, so that the processor executes the above first aspect and / or various possible implementation manners of the first aspect.

[0064] In a fourth aspect, the present application provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, they are used to implement the above first aspect and / or various possible implementation manners of the first aspect.

[0065] In a fifth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the above first aspect and / or various possible implementation manners of the first aspect.

[0066] The operating frequency determination method, device, medium and program product provided by the present application, by obtaining the first response function and the second response function of the wireless power transmission system, wherein the first response function represents the relationship between the parasitic resistance of the coil in the wireless power transmission system and the operating frequency; the second response function represents the relationship between the parasitic resistance of the capacitance in the wireless power transmission system and the operating frequency; according to the first response function, the second response function and the equivalent circuit model corresponding to the wireless power transmission system, determine the target mesh current equation; by embedding the first response function representing the relationship between the parasitic resistance of the coil and the operating frequency and the relationship between the parasitic resistance of the capacitance and the operating frequency as a whole into the target mesh current equation, the modeling efficiency of the wireless power transmission system is significantly improved through the black-box processing, and the accuracy of determining the operating frequency is improved by comprehensively considering the first response function and the second response function. According to the target mesh current equation, determine the actual operating frequency of the wireless power transmission system, reduce the time consumption of determining the operating frequency, and improve the efficiency of determining the operating frequency. Brief Description of the Drawings

[0067] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0068] Figure 1 It is a schematic diagram of the scenario of the working frequency determination method provided by an embodiment of this application;

[0069] Figure 2 It is a flowchart of the working frequency determination method provided by an embodiment of this application Figure 1 ;

[0070] Figure 3 It is a flowchart of the working frequency determination method provided by an embodiment of this application Figure 2 ;

[0071] Figure 4 It is a flowchart of the working frequency determination method provided by an embodiment of this application Figure 3 ;

[0072] Figure 5 It is a schematic structural diagram of the working frequency determination device provided by an embodiment of this application;

[0073] Figure 6 It is a schematic structural diagram of the electronic device provided by an embodiment of this application.

[0074] Through the above accompanying drawings, specific embodiments of this application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. Detailed Description of the Embodiments

[0075] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. On the contrary, they are merely examples of devices and methods consistent with some aspects of this application as detailed in the appended claims.

[0076] In the magnetic coupling wireless power transfer technology, the energy transfer can be realized by the electromagnetic induction between coils. Under actual working conditions, the resistance characteristics of the coils are affected by the combined effects of the skin effect and the proximity effect. When a high-frequency current is applied to the coils, the skin effect causes uneven current distribution across the cross-section of the coil conductor, and the proximity effect induces electromagnetic coupling between adjacent coil conductors. The combined action of the skin effect and the proximity effect makes the equivalent resistance of the coils increase non-linearly with the increase of the operating frequency, resulting in a decrease in the transmission efficiency of the wireless power transfer system.

[0077] In the related art, by separately determining the influence of the proximity effect on the operating frequency of the wireless power transfer system and the influence of the skin effect on the operating frequency of the wireless power transfer system, the influence of the parasitic resistance of the coils on the operating frequency is obtained, and a suitable operating frequency is selected according to the influence of the parasitic resistance of the coils on the operating frequency. Specifically, by using the method of parametric scanning, the data of the parasitic resistance generated under the influence of the proximity effect at different operating frequencies are obtained, and then by using the method of function fitting, the relationship between the parasitic resistance generated under the influence of the proximity effect and the frequency is established to obtain the influence of the proximity effect on the operating frequency. At the same time, according to the internal parameters of different coil materials, the relationship between the parasitic resistance generated under the influence of the skin effect and the operating frequency is determined to obtain the influence of the skin effect on the operating frequency. By superimposing the influence of the proximity effect on the operating frequency and the influence of the skin effect on the operating frequency, the influence of the parasitic resistance of the coils on the operating frequency is obtained; and a suitable operating frequency is selected according to the influence of the parasitic resistance of the coils on the operating frequency. Ignoring the non-linear interaction between the proximity effect and the skin effect, there is generally a problem of low accuracy of the determined operating frequency; at the same time, the independent modeling processes for the proximity effect and the skin effect need to repeatedly execute simulation calculations and parameter fitting, resulting in waste of time resources. There are problems of long time consumption and poor parameter coupling.

[0078] The operating frequency determination method provided by the embodiments of the present application determines the target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transfer system; embeds the first response function representing the relationship between the parasitic resistance of the coils and the operating frequency and the relationship between the parasitic resistance of the capacitor and the operating frequency as a whole into the target mesh current equation, significantly improving the modeling efficiency of the wireless power transfer system through black-box processing, reducing the time consumption for determining the operating frequency, and improving the accuracy of determining the operating frequency by comprehensively considering the first response function and the second response function. Using the operating frequency determined by the operating frequency determination method provided by the embodiments of the present application for wireless power transfer can ensure that the wireless power transfer system performs power transfer with a high operating efficiency.

[0079] Figure 1 It is a schematic diagram of the scenario of the operating frequency determination method provided by the embodiments of the present application. As Figure 1As shown in the figure, the specific application scenarios of this application include a wireless power transmission system 11, a measurement center 12, and a calculation center 13, where:

[0080] The wireless power transmission system 11 can obtain the equivalent circuit model data used during wireless power transmission and transfer the equivalent circuit model data to the calculation center 13. At the same time, the wireless power transmission system can also receive the operating frequency transmitted by the calculation center 13 and perform wireless power transmission operations according to the operating frequency transmitted by the calculation center 13.

[0081] The measurement center 12 can receive the measurement instructions from the calculation center 13, respond to the measurement instructions to measure the relevant parameters in the wireless power transmission system 11, generate a measurement report, and send the measurement report corresponding to the measurement instructions to the calculation center 13.

[0082] The calculation center 13 determines the relevant parameters to be measured based on the equivalent circuit model data of the wireless power transmission system 11, sends measurement instructions for collecting the relevant parameters to the measurement center 12, and accepts the measurement report returned by the measurement center 12. The calculation center 13 determines the operating frequency of the wireless power transmission system 11 during wireless power transmission operations based on the equivalent circuit model data and the measurement report, and sends the operating frequency to the wireless power transmission system 11.

[0083] The following uses specific embodiments to detail the technical solution of this application and how the technical solution of this application solves the above technical problems. These several specific embodiments below can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0084] Figure 2 Schematic flow of the operating frequency determination method provided by the embodiments of this application Figure 1 As Figure 2 shown, this method is applied to a wireless power transmission system and includes:

[0085] S201. Obtain the first response function and the second response function of the wireless power transmission system, where the first response function represents the relationship between the parasitic resistance of the coil in the wireless power transmission system and the operating frequency; the second response function represents the relationship between the parasitic resistance of the capacitor in the wireless power transmission system and the operating frequency.

[0086] A wireless power transfer system is a system that realizes the transfer of electrical energy from the transmitting end to the receiving end through the principles of electromagnetic induction and electromagnetic resonance. Parasitic resistance refers to the additional resistance introduced by factors such as materials and manufacturing processes in actual circuit components such as coils and capacitors, in addition to the characteristics of ideal components. For example, there is a certain additional resistance in the wire of the coil, and there are also tiny additional resistances in the plates and dielectrics of the capacitor. Parasitic resistance will cause losses when transmitting electrical energy, reducing the transmission efficiency. The operating frequency refers to the frequency of the electromagnetic field oscillation in the wireless power transfer system. Different operating frequencies will affect the transmission efficiency and performance of the wireless power transfer system. In a wireless power transfer system, common operating frequencies are 100 kHz, 150 kHz, 200 kHz, etc. At different operating frequencies, the influence of the parasitic resistance of the coil and capacitor on the transmission efficiency of the wireless power transfer system is also different.

[0087] Exemplarily, the content of the obtained first response function and second response function can be: obtaining a first response function representing the relationship between the parasitic resistance of the coil in the wireless power transfer system and the operating frequency and obtaining a second response function representing the relationship between the parasitic resistance of the capacitor in the wireless power transfer system and the operating frequency

[0088] S202. Determine the target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transfer system.

[0089] The target mesh current equation is an equation used to describe the current distribution in each mesh in the wireless power transfer system. Among them, a mesh is a closed loop in the wireless power transfer system. By solving the target mesh current equation, the current characteristics of the wireless power transfer system at different operating frequencies can be obtained. The equivalent circuit model is a circuit model composed of one or more circuit components after simplifying the complex wireless power transfer system. Optionally, the wireless power transfer system can be simplified into a circuit model of a transmitting coil, a receiving coil, and the mutual inductance between the transmitting coil and the receiving coil.

[0090] According to the actual structure of the wireless power transfer system, establish an equivalent circuit model composed of multiple circuit components, and determine the multiple meshes and multiple nodes existing in the equivalent circuit model. Apply Kirchhoff's Voltage Laws (KVL) to each mesh, list the voltage equation of each mesh, and obtain the voltage equations of multiple meshes. Apply Kirchhoff's Current Law (KCL) to each node, list the current equation of each node, and obtain the current equations of multiple nodes.

[0091] Combine the voltage equations of multiple meshes, the current equations of multiple nodes, the first response function, and the second response function to form the target mesh current equation.

[0092] S203. Determine the actual operating frequency of the wireless power transmission system according to the target mesh current equation.

[0093] The actual operating frequency refers to the operating frequency of the wireless power transmission system during actual operation. The actual operating frequency is usually determined under the conditions of higher system efficiency and lower losses.

[0094] Solve the target mesh current equation to obtain the expression of the mesh current and the operating frequency. According to the performance indicators of the wireless power transmission system, determine the system performance at different operating frequencies through the expression of the mesh current and the operating frequency, and determine the operating frequency when the performance indicators reach an optimal level. Optionally, when the performance indicator is the transmission efficiency, analyze the transmission efficiency at different frequencies, and use the operating frequency when the transmission efficiency reaches an optimal level as the actual operating frequency.

[0095] The operating frequency determination method provided by the embodiments of the present application obtains the first response function and the second response function of the wireless power transmission system, where the first response function represents the relationship between the parasitic resistance of the coil in the wireless power transmission system and the operating frequency; the second response function represents the relationship between the parasitic resistance of the capacitor in the wireless power transmission system and the operating frequency; determine the target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transmission system; by integrating the first response function representing the relationship between the parasitic resistance of the coil and the operating frequency and the relationship between the parasitic resistance of the capacitor and the operating frequency as a whole to obtain the target mesh current equation, significantly improve the modeling efficiency of the wireless power transmission system through the black-box processing, and improve the accuracy of determining the operating frequency by comprehensively considering the first response function and the second response function. Determine the actual operating frequency of the wireless power transmission system according to the target mesh current equation, and improve the transmission performance of the wireless power transmission system and the efficiency of determining the operating frequency.

[0096] Figure 3 It is a schematic flow of the operating frequency determination method provided by the embodiments of the present application. Figure 2 . As Figure 3 shown, on the basis of the Figure 2 embodiment, the operating frequency determination method is described in detail. The method includes:

[0097] In a possible implementation manner, the above step S201 further includes steps S301 - S303, where:

[0098] S301. At a preset operating frequency, obtain the parasitic resistance of the coil and the parasitic resistance of the capacitor in the wireless power transfer system; the preset operating frequency includes multiple different operating frequencies.

[0099] The preset operating frequency refers to a set of different operating frequencies preset in the wireless power transfer system to test and analyze the performance of the wireless power transfer system at different frequencies. Optionally, the preset operating frequency can be a specific digital sequence.

[0100] Exemplarily, the preset operating frequency includes operating frequencies represented by multiple specific values such as 100 kHz, 200 kHz, and 300 kHz. Further, the preset operating frequency can also be a sequence at intervals of a predetermined measurement step between the minimum operating frequency and the maximum operating frequency. Furthermore, the preset operating frequency can also be a set of intervals between the minimum operating frequency and the maximum operating frequency.

[0101] Exemplarily, when the preset operating frequency is a sequence at intervals of a predetermined measurement step between the minimum operating frequency and the maximum operating frequency, and the minimum operating frequency f min = 10 KHZ, the maximum operating frequency f max = 50 KHZ, and the predetermined measurement step is 10 KHZ, the preset operating frequency is a sequence at intervals of the predetermined measurement step of 10 KHZ between the minimum operating frequency of 10 KHZ and the maximum operating frequency of 50 KHZ, which is {10 KHZ, 20 KHZ, 30 KHZ, 40 KHZ, 50 KHZ}. Exemplarily, when the preset operating frequency is a set of intervals between the minimum operating frequency and the maximum operating frequency, if the minimum operating frequency is 10 KHZ and the maximum operating frequency is 50 KHZ, then the preset operating frequency can be any value in 10 KHZ - 50 KHZ.

[0102] At the preset operating frequency, use a high-precision resistance measuring instrument to measure the parasitic resistance of the coil in the wireless power transfer system to obtain the parasitic resistance of the coil; at the same time, measure the parasitic resistance of the capacitor to obtain the parasitic resistance of the capacitor. Optionally, the resistance measuring instrument can be an impedance analyzer.

[0103] Exemplarily, if the preset operating frequencies include 100 kHz, 200 kHz, and 300 kHz, use a high-precision resistance measuring instrument to measure the parasitic resistance value of the coil at an operating frequency of 100 kHz; measure the parasitic resistance value of the coil at an operating frequency of 200 kHz; and measure the parasitic resistance value of the coil at an operating frequency of 300 kHz. In this way, by integrating the parasitic resistance values at different operating frequencies, the parasitic resistance of the coil can be obtained. Similarly, use a high-precision resistance measuring instrument to measure the parasitic resistance value of the capacitor at an operating frequency of 100 kHz; measure the parasitic resistance value of the capacitor at an operating frequency of 200 kHz; and measure the parasitic resistance value of the capacitor at an operating frequency of 300 kHz. The parasitic resistance of the capacitor is obtained by integrating the parasitic resistance values at different operating frequencies.

[0104] Exemplarily, assume that the structure, size, number of turns, and winding method of the coil used in the wireless power transmission system are the same, and the self-inductance of the coil is L; the preset operating frequencies are a sequence at intervals of a predetermined measurement step of 10 kHz between the minimum operating frequency f0 and the maximum operating frequency of 1 MHz. Measure the parasitic resistance of the coil at different preset operating frequencies to obtain the parasitic resistance of the coil; at the same time, measure the parasitic resistance of the capacitor at different preset operating frequencies to obtain the parasitic resistance of the capacitor.

[0105] S302. Based on the function fitting method and the parasitic resistance of the coil at the preset operating frequency, construct the relationship between the parasitic resistance of the coil and the operating frequency to obtain the first response function.

[0106] The function fitting method is capable of determining a suitable function based on a set of data to describe the relationship between a set of data. Common fitting models include linear fitting, polynomial fitting, exponential fitting, etc.

[0107] First, select a suitable fitting model according to the data distribution of the parasitic resistance of the coil at the preset operating frequency. Exemplarily, if the data shows a linear distribution, linear fitting can be selected as the fitting model of the function fitting method; if the data shows a non-linear distribution, polynomial fitting can be selected as the fitting model of the function fitting method. Then, use a mathematical tool to fit the data to obtain an initial function describing the relationship between the parasitic resistance of the coil and the operating frequency. Optionally, the mathematical tool can be mathematical tool software, or any executable code formed by a programming script or programming language that can be used for mathematical calculations, or any other tool capable of performing function fitting.

[0108] Afterwards, verify the accuracy of the initial function through an appropriate verification method. Optionally, the verification method can be residual analysis or goodness of fit. Optionally, when the verification method is residual analysis, when the residual obtained from the residual analysis is less than the residual threshold, it is determined that the fitting verification passes; otherwise, it is determined that the fitting verification fails. When the verification method is goodness of fit, when the goodness of fit obtained from the goodness of fit is greater than the goodness of fit threshold, it is determined that the fitting verification passes; otherwise, it is determined that the fitting verification fails. When the fitting verification fails, try other fitting models or adjust the fitting parameters, and re - perform the verification until the obtained initial function passes the fitting verification. Take the initial function that finally passes the fitting verification as the relationship between the parasitic resistance of the coil and the operating frequency, and obtain the first response function.

[0109] Exemplarily, assume that at preset operating frequencies of 100 kHz, 200 kHz, 300 kHz, and 400 kHz, the measured parasitic resistances of the coil are 0.3 Ω, 0.5 Ω, 0.7 Ω, and 0.9 Ω respectively. The fitting verification method uses residual analysis, and the residual threshold is 0.1. The parasitic resistance increases linearly with frequency. Select the linear fitting R coil = kf + b as the fitting model for the function fitting method. Then, use the fitting function in the mathematical tool to fit the data, and obtain the fitting parameters: k = 0.002, b = 0.1. The obtained initial function is R coil = 0.002f + 0.1. Afterwards, calculate the residual between the fitting value and the actual measured value at the preset operating frequency to verify the fitting effect. Exemplarily, assume that the residual threshold is at 100 kHz, the fitting value is 0.3, the actual value is 0.3, and the residual is 0. At this time, the residual is less than the residual threshold, and the initial function passes the fitting verification. Therefore, take the initial function R coil = 0.002f + 0.1 as the relationship between the parasitic resistance of the coil and the operating frequency, and obtain the first response function.

[0110] S303. Based on the function fitting method and the parasitic resistance of the capacitor at the preset operating frequency, construct the relationship between the parasitic resistance of the capacitor and the operating frequency, and obtain the second response function.

[0111] Similar to step S302, likewise, select an appropriate fitting model according to the distribution of the parasitic resistance of the capacitor at the preset operating frequency, use the mathematical tool to fit the data to obtain the initial function, and verify whether the initial function can pass the fitting verification through an appropriate verification method. Use the initial function that finally passes the fitting verification to describe the relationship between the parasitic resistance of the capacitor and the operating frequency, and obtain the second response function.

[0112] Exemplarily, assume that at preset operating frequencies of 100 kHz, 200 kHz, 300 kHz, and 400 kHz, the measured parasitic resistances of the capacitor are 0.16 Ω, 0.37 Ω, 0.62 Ω, and 0.91 Ω respectively. The parasitic resistance increases non-linearly with frequency. Select the polynomial fitting model R cap = af 2 + bf + c as the fitting model for the function fitting method. Then, use the fitting function in the mathematical tool to fit the data, and obtain the fitting parameters: a = 0.00001, b = 0.001, c = 0.05. The initial function obtained is R cap = 0.00001f 2 + 0.001f + 0.05. After that, calculate the residuals between the fitting values and the actual measured values of the preset operating frequencies to verify the fitting effect. When the initial function passes the fitting verification, take the initial function R coil = 0.002f + 0.1 as the relationship between the parasitic resistance of the coil and the operating frequency, and obtain the second response function.

[0113] The method of constructing the first response function in step S302 and the second response function in step S303 described above is relatively simple. The first response function and the second response function can be used to predict the parasitic resistance value at any operating frequency, providing a reference for determining the operating frequency of the wireless power transfer system. At the same time, by constructing the relationship formula between the parasitic resistance and the frequency, the process of determining the operating frequency is closer to the actual physical system, and the finally determined operating frequency result is more in line with the actual working conditions.

[0114] When describing the method flow of the embodiments of the present application, the labels of step S302 and step S303 are only for facilitating the description and understanding of the specific content of each step. In actual applications, the order of determining the first response function and the second response function is not limited by these labels. That is to say, according to actual requirements and specific application scenarios, the execution order of these two steps can be flexibly adjusted.

[0115] In a possible implementation manner, the above step S202 further includes steps S304 - S306, where:

[0116] S304. Add the first response function and the second response function to obtain a third response function; the third response function represents the relationship between the total parasitic resistance in the wireless power transfer system and the operating frequency, and the total parasitic resistance includes the parasitic resistance of the coil and the parasitic resistance of the capacitor.

[0117] The third response function is obtained by adding the first response function and the second response function, representing the relationship between the total parasitic resistance and the operating frequency in the wireless power transfer system. Among them, the total parasitic resistance is the sum of the coil parasitic resistance and the capacitor parasitic resistance.

[0118] Represent the first response function \(R\) using mathematical language coil and the second response function \(R\) cap and the third response function \(R\) total The relationship between them is obtained as: \(R\) total = \(R\) cap + \(R\) coil .

[0119] Exemplarily, assume the first response function is: \(R\) coil = 0.002f + 0.1, and the second response function is: \(R\) cap = 0.00001f 2 + 0.001f + 0.05. Add the first response function and the second response function to obtain the third response function \(R\) total = 0.002f + 0.1 + 0.00001f 2 + 0.001f + 0.05. Combine and sort the like terms in the third response function to obtain the third response function \(R\) total = 0.00001f 2 + 0.003f + 0.15.

[0120] S305. Determine the mesh current and output voltage of each mesh in the equivalent circuit model.

[0121] The mesh current refers to the current flowing in the mesh of the circuit. Through KVL, the current in each mesh can be solved. By the equivalent circuit model, multiple nodes in the equivalent circuit model are determined, and KVL is applied to each node to obtain the current equations representing the mesh currents of each node: where \(n\) represents the number of nodes in the equivalent circuit model.

[0122] The output voltage refers to the voltage at the receiving end in the wireless power transfer system and is one of the important indicators of the system transmission efficiency. By establishing an equivalent circuit model, multiple meshes in the equivalent circuit model are determined. KVL is applied to each of the multiple meshes to obtain the equivalent input voltage representing the output voltage of each mesh

[0123] S306. Determine the target mesh current equation according to the third response function and the mesh current and output voltage of each mesh.

[0124] Integrate the third response function with the mesh current and output voltage of each mesh into an equation, and determine the integrated equation as the target mesh current equation.

[0125] In a possible implementation manner, the above step S203 further includes steps S307 - S310, where:

[0126] S307. Solve the target mesh current equation to determine the first relationship function between the mesh current and the operating frequency in the wireless power transfer system.

[0127] Use a mathematical solving tool to solve the target mesh current equation, obtain the expression of the mesh current with respect to the operating frequency, and determine the first relationship function between the mesh current and the operating frequency in the wireless power transfer system.

[0128] S308. Determine the second relationship function between the transmission efficiency and the operating frequency in the wireless power transfer system according to the first relationship function and the efficiency determination formula.

[0129] In the wireless power transfer system, the transmission efficiency is usually defined as the ratio of the output power at the receiving end to the input power at the transmitting end. According to the first relationship function, calculate the variation relationship of the current of each mesh with frequency. Substitute the first relationship function into the efficiency determination formula to obtain the second relationship function between the transmission efficiency and the operating frequency.

[0130] Optionally, the efficiency determination formula is:

[0131]

[0132] Where represents the first relationship function between the mesh current and the operating frequency in the nth mesh. Re[Z L represents the real part of the load impedance at the receiving end, which reflects the active power consumed by the load, and Re[Z L ≠0; is the input voltage at the transmitting end; is the mesh current at the transmitting end; is a complex number representing the input power; represents the real part of the input power at the transmitting end; if the load at the receiving end is a pure resistor, then Re[Z L =R L , where R L is the load resistance.

[0133] S309. Determine the number of frequency extreme points according to the second relationship function.

[0134] The frequency extreme point refers to the frequency point at which the transmission efficiency reaches the maximum value in the second relationship function, which usually corresponds to the optimal operating frequency of the performance of the wireless power transfer system.

[0135] Obtain the frequency extreme points through the frequency extreme point determination formula composed of the first derivative and the second derivative of the second relationship function, and then obtain the number of frequency extreme points. The frequency extreme point determination formula is:

[0136]

[0137] First, it is necessary to find the first derivative of the efficiency function ψ(f) with respect to the frequency f, set the first derivative to zero, and solve for the extreme points. Then, to determine whether an extreme point is a maximum point or a minimum point, evaluate the second derivative of the efficiency function at each extreme point. If the second derivative is less than zero, the extreme point is a maximum point; if the second derivative is greater than zero, the extreme point is a minimum point. Through the above process, all the maximum points among the extreme points are obtained, and the maximum points are used as the frequency extreme points, and then the number of frequency extreme points is obtained.

[0138] S310. Determine the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points.

[0139] According to the number of extreme points, evaluate the transmission efficiency corresponding to each extreme point. Select the frequency point with the highest transmission efficiency as the actual operating frequency. Optionally, if there are multiple extreme points, compare the transmission efficiencies of these points and select the frequency point with the highest efficiency.

[0140] The method for determining the operating frequency provided by the embodiment of the present application constructs the first and second response functions between the coil and capacitor parasitic resistances and the operating frequency, and adds these two functions to obtain the third response function representing the relationship between the total parasitic resistance and the operating frequency, avoiding specific analysis of the materials used for the coil or capacitor, reducing the difficulty of determining the operating frequency, and improving the applicability of the method for determining the operating frequency. Further, by solving the target mesh current equation, the first relationship function between the mesh current and the operating frequency is obtained. Then, using the efficiency determination formula, the first relationship function is transformed into the second relationship function between the transmission efficiency and the operating frequency, avoiding separate analysis of the effects caused by the proximity effect and skin effect, reducing the calculation redundancy during separate analysis, and improving the efficiency of determining the operating frequency. Finally, by taking the derivative and analyzing the second relationship function, the number of frequency extreme points is determined, and finally the actual operating frequency of the wireless power transmission system is determined, realizing the method for determining the operating frequency of a single-input single-output black box type. By transforming the complex system analysis into the solution and analysis of mathematical functions, the process of determining the operating frequency is simplified, the workload of calculation is reduced, and the efficiency of determining the operating frequency is improved.

[0141] Figure 4 is a flow schematic of the method for determining the operating frequency provided by the embodiment of the present application Figure 3 . As Figure 4 shown, on the basis of the Figure 2 embodiment, the method for determining the operating frequency is described in detail. The method includes:

[0142] In a possible implementation manner, the above step S301 may further include:

[0143] S3011. At a preset operating frequency, obtain the capacitance value range corresponding to the capacitance that resonates with the coil.

[0144] According to the preset operating frequency, determine the maximum operating frequency and the minimum operating frequency. Between the maximum operating frequency and the minimum operating frequency, obtain the values of all capacitances that can resonate with the coil to obtain the capacitance value range.

[0145] Exemplarily, if the minimum operating frequency is f0 and the maximum operating frequency is 1 MHz greater than the minimum operating frequency, then determine the maximum operating frequency as f end = f0 + 1 MHz. Between the maximum operating frequency f end and the minimum operating frequency f0, obtain the values of all capacitances that can resonate with the coil to obtain the capacitance value range C.

[0146] S3012. Calculate the average value of the maximum capacitance value and the minimum capacitance value within the capacitance value range, and determine the average value as the target capacitance.

[0147] According to the capacitance value range, determine the maximum capacitance and the minimum capacitance, and determine the average value between the maximum capacitance and the minimum capacitance. Take the average value between the maximum capacitance and the minimum capacitance as the target capacitance.

[0148] Exemplarily, if the maximum capacitance is C max and the minimum capacitance is C min , then determine the average value C ave between the maximum capacitance and the minimum capacitance as:

[0149]

[0150] Then the target capacitance is C ave .

[0151] S3013. Measure the parasitic resistance of the target capacitance at the preset operating frequency, and determine the parasitic resistance of the target capacitance as the parasitic resistance of the capacitance in the wireless power transmission system.

[0152] Measure the parasitic resistance values corresponding to different operating frequencies of the target capacitance at the preset operating frequency to obtain the parasitic resistance of the target capacitance. Determine the parasitic resistance of the target capacitance as the parasitic resistance of the capacitance in the wireless power transmission system.

[0153] If the preset operating frequency is the minimum operating frequency f0 and the maximum operating frequency is f endInterval. Measure the parasitic resistance of the target capacitor in the wireless power transfer system at a preset frequency measurement step within the interval of the preset operating frequency, and obtain the parasitic resistance of the target capacitor. Exemplarily, the preset frequency measurement step can be 10 kHz.

[0154] In a possible implementation, the above step S306 may further include:

[0155] Step 1: Obtain an initial mesh current equation including an impedance matrix based on the mesh current and output voltage of each mesh.

[0156] According to the current equation representing the mesh current of each node: and, the equivalent input voltage representing the output voltage of each mesh Establish an initial mesh current equation including the impedance matrix Z. Express the initial mesh current equation as:

[0157]

[0158] where, represents the voltage phasor, the 0,..., 0 in represents a series of 0s for the voltage phasor the other voltages in are initialized to 0; represents the current phasor, represents the magnitude of the current phasor of the nth mesh.

[0159] Step 2: Replace the impedance matrix with a third response function to obtain the target mesh current equation.

[0160] Replace the impedance matrix in the initial mesh current equation with a third response function, and embed the relationship between the total parasitic resistance and the operating frequency into the initial mesh current equation to obtain a target mesh current equation that better fits the actual physical system.

[0161] Exemplarily, if the third response function is R total , the initial mesh current equation is:

[0162]

[0163] where, represents the voltage phasor, the 0,..., 0 in represents a series of 0s for the voltage phasor the other voltages in are initialized to 0; represents the current phasor, represents the magnitude of the current phasor of the nth mesh.

[0164] Replace the impedance matrix Z with the third response function R total, the target mesh current equation is obtained as:

[0165]

[0166] in, represents the voltage phasor, The 0,...,0 in the 0 represents a series of 0s, which is used for voltage phasors. The other voltages are initialized to 0; represents the current phasor, Indicates the current phasor magnitude of the nth mesh.

[0167] In a possible implementation, the above step S310 may further include:

[0168] Step 1: When the number of frequency extreme value points is 1, the operating frequency corresponding to the frequency extreme value point is determined as the actual operating frequency of the wireless power transmission system.

[0169] When the number of frequency extreme points is 1, it indicates that there is only one maximum transmission efficiency, and the operating frequency corresponding to the maximum transmission efficiency is the operating frequency corresponding to the frequency extreme point. Therefore, the operating frequency corresponding to the frequency extreme point is determined as the actual operating frequency of the wireless power transmission system.

[0170] Step 2: When there are multiple frequency extreme value points, determine the operating frequency corresponding to the target frequency extreme value point as the actual operating frequency of the wireless power transmission system; wherein the target frequency extreme value point is the frequency extreme value point with the highest transmission efficiency among the multiple frequency extreme value points.

[0171] If there are multiple frequency extreme points, this indicates that there are multiple maximum transmission efficiency values. Therefore, by comparing the transmission efficiencies corresponding to the frequency extreme points, the maximum transmission efficiency is determined. The frequency extreme point corresponding to the maximum transmission efficiency is designated as the target frequency extreme point. The operating frequency corresponding to the target frequency extreme point is then determined as the actual operating frequency of the wireless power transmission system.

[0172] Figure 5 This is a schematic diagram of the structure of the operating frequency determination device provided in the embodiment of the present application. Figure 5 As shown, the operating frequency determination device 50 provided in this embodiment includes:

[0173] An acquisition module 501 is configured to acquire a first response function and a second response function of the wireless power transmission system, wherein the first response function represents a relationship between a parasitic resistance of a coil and an operating frequency in the wireless power transmission system; and the second response function represents a relationship between a parasitic resistance of a capacitor and an operating frequency in the wireless power transmission system.

[0174] A processing module 502, configured to determine a target mesh current equation according to a first response function, a second response function, and an equivalent circuit model corresponding to the wireless power transmission system; and determine an actual operating frequency of the wireless power transmission system according to the target mesh current equation.

[0175] In a possible implementation manner, the processing module 502 is specifically configured to:

[0176] Add the first response function and the second response function to obtain a third response function; the third response function represents the relationship between the total parasitic resistance in the wireless power transmission system and the operating frequency, and the total parasitic resistance includes the parasitic resistance of the coil and the parasitic resistance of the capacitor;

[0177] Determine the mesh current and output voltage of each mesh in the equivalent circuit model;

[0178] Determine a target mesh current equation according to the third response function, the mesh current of each mesh, and the output voltage.

[0179] In a possible implementation manner, the processing module 502 is further configured to:

[0180] Obtain an initial mesh current equation including an impedance matrix according to the mesh current and output voltage of each mesh;

[0181] Replace the impedance matrix with the third response function to obtain a target mesh current equation.

[0182] In a possible implementation manner, the processing module 502 is specifically configured to:

[0183] Solve the target mesh current equation to determine a first relationship function between the mesh current and the operating frequency in the wireless power transmission system;

[0184] Determine a second relationship function between the transmission efficiency and the operating frequency in the wireless power transmission system according to the first relationship function and the efficiency determination formula;

[0185] Determine the number of frequency extreme points according to the second relationship function;

[0186] Determine the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points.

[0187] In a possible implementation manner, the processing module 502 is further configured to:

[0188] When the number of frequency extreme points is 1, determine the operating frequency corresponding to the frequency extreme point as the actual operating frequency of the wireless power transmission system;

[0189] When the number of frequency extreme points is multiple, determine the operating frequency corresponding to the target frequency extreme point as the actual operating frequency of the wireless power transfer system; wherein, the target frequency extreme point is the frequency extreme point with the maximum transmission efficiency among the multiple frequency extreme points.

[0190] In a possible implementation manner, the obtaining module 501 is specifically configured to:

[0191] At a preset operating frequency, obtain the parasitic resistance of the coil and the parasitic resistance of the capacitor in the wireless power transfer system; the preset operating frequency includes multiple different operating frequencies;

[0192] Based on the function fitting method and the parasitic resistance of the coil at the preset operating frequency, construct the relationship between the parasitic resistance of the coil and the operating frequency to obtain a first response function; and,

[0193] Based on the function fitting method and the parasitic resistance of the capacitor at the preset operating frequency, construct the relationship between the parasitic resistance of the capacitor and the operating frequency to obtain a second response function.

[0194] In a possible implementation manner, the obtaining module 501 is further configured to:

[0195] At the preset operating frequency, obtain the capacitance value range corresponding to the capacitor that resonates with the coil;

[0196] Calculate the average value of the maximum capacitance value and the minimum capacitance value within the capacitance value range;

[0197] Determine the average value as the target capacitance;

[0198] Measure the parasitic resistance of the target capacitance at the preset operating frequency, and determine the parasitic resistance of the target capacitance as the parasitic resistance of the capacitor in the wireless power transfer system.

[0199] The operating frequency determination device provided in this embodiment can execute the method provided in the above method embodiment, and its implementation principle and technical effects are similar, which will not be elaborated here in this embodiment.

[0200] Figure 6 This is a schematic structural diagram of the electronic device provided in the embodiment of the present application. As Figure 6 shown, the electronic device 60 provided in this embodiment includes: at least one processor 601 and a memory 602. Optionally, the device 60 further includes a communication component 603. Among them, the processor 601, the memory 602, and the communication component 603 are connected through a bus 604.

[0201] In the specific implementation process, at least one processor 601 executes the computer execution instructions stored in the memory 602, so that at least one processor 601 executes the above method.

[0202] For the specific implementation process of the processor 601, reference may be made to the above method embodiments. Their implementation principles and technical effects are similar, and will not be elaborated here in this embodiment.

[0203] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), etc. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the invention can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor.

[0204] The memory may include a high-speed random access memory (RAM), and may also include non-volatile memory (NVM), such as at least one disk memory.

[0205] The bus may be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of convenience of representation, the bus in the attached drawings of the embodiments of the present application is not limited to only one bus or one type of bus.

[0206] The embodiments of the present application further provide a computer program product, including a computer program, and when the computer program is executed by a processor, the above method is implemented.

[0207] The embodiments of the present application further provide a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed, any of the above methods is implemented.

[0208] The above-readable storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, a magnetic disk, or an optical disk. The readable storage medium may be any available medium accessible by a general-purpose or special-purpose computer.

[0209] An exemplary readable storage medium is coupled to the processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium may also be a component of the processor. The processor and the readable storage medium may be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium may also exist as discrete components in a device.

[0210] The division of units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other may be through some interfaces, and the indirect couplings or communication connections of devices or units may be in electrical, mechanical, or other forms.

[0211] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0212] In addition, in each embodiment of the present invention, the functional units may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0213] If a function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0214] Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When this program is executed, it executes the steps including the above method embodiments; and the aforementioned storage medium includes: various media such as ROMs, RAMs, magnetic disks, or optical discs that can store program codes.

[0215] Finally, it should be noted that: After considering the specification and practicing the invention disclosed herein, those skilled in the art will readily think of other implementation manners of the present invention. The present invention is intended to cover any variations, uses, or adaptive changes of the present invention, and these variations, uses, or adaptive changes follow the general principles of the present invention and include common general knowledge or conventional technical means in the technical field not disclosed in the present invention. It is not limited to the precise structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

Claims

1. A method for determining the operating frequency, characterized in that, Applied to a wireless power transmission system, including: Obtain a first response function and a second response function of the wireless power transmission system, where the first response function represents the relationship between the parasitic resistance of the coil in the wireless power transmission system and the operating frequency; the second response function represents the relationship between the parasitic resistance of the capacitor in the wireless power transmission system and the operating frequency; Determine a target mesh current equation according to the first response function, the second response function, and an equivalent circuit model corresponding to the wireless power transmission system; Determine the actual operating frequency of the wireless power transmission system according to the target mesh current equation.

2. The method according to claim 1, wherein The step of determining a target mesh current equation according to the first response function, the second response function, and an equivalent circuit model corresponding to the wireless power transmission system includes: Add the first response function and the second response function to obtain a third response function; the third response function represents the relationship between the total parasitic resistance in the wireless power transmission system and the operating frequency, and the total parasitic resistance includes the parasitic resistance of the coil and the parasitic resistance of the capacitor; Determine the mesh current and output voltage of each mesh in the equivalent circuit model; Determine the target mesh current equation according to the third response function, the mesh current of each mesh, and the output voltage.

3. The method according to claim 2, wherein The step of determining the target mesh current equation according to the third response function, the mesh current of each mesh, and the output voltage includes: Obtain an initial mesh current equation including an impedance matrix according to the mesh current and output voltage of each mesh; Replace the impedance matrix with the third response function to obtain the target mesh current equation.

4. The method according to claim 1, characterized in that, The step of determining the actual operating frequency of the wireless power transmission system according to the target mesh current equation includes: Solve the target mesh current equation to determine a first relationship function between the mesh current and the operating frequency in the wireless power transmission system; Determine a second relationship function between the transmission efficiency and the operating frequency in the wireless power transmission system according to the first relationship function and an efficiency determination formula; Determine the number of frequency extreme points according to the second relationship function; Determine the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points.

5. The method according to claim 4, characterized in that, The step of determining the actual operating frequency of the wireless power transmission system according to the number of frequency extreme points includes: When the number of frequency extreme points is 1, determine the operating frequency corresponding to the frequency extreme point as the actual operating frequency of the wireless power transmission system; When the number of frequency extreme points is multiple, determine the operating frequency corresponding to the target frequency extreme point as the actual operating frequency of the wireless power transmission system; where the target frequency extreme point is the frequency extreme point with the maximum transmission efficiency among the multiple frequency extreme points.

6. The method according to claim 1, wherein The step of obtaining the first response function and the second response function of the wireless power transmission system includes: At a preset operating frequency, obtain the parasitic resistance of the coil and the parasitic resistance of the capacitor in the wireless power transfer system; the preset operating frequency includes a plurality of different operating frequencies; Based on the function fitting method and the parasitic resistance of the coil at the preset operating frequency, construct the relationship between the parasitic resistance of the coil and the operating frequency to obtain the first response function; and, Based on the function fitting method and the parasitic resistance of the capacitor at the preset operating frequency, construct the relationship between the parasitic resistance of the capacitor and the operating frequency to obtain the second response function.

7. The method according to claim 6, characterized in that, Obtaining the parasitic resistance of the capacitor in the wireless power transfer system includes: At the preset operating frequency, obtain the capacitance value range corresponding to the capacitor that resonates with the coil; Calculate the average value of the maximum capacitance value and the minimum capacitance value within the capacitance value range; Determine the average value as the target capacitor; Measure the parasitic resistance of the target capacitor at the preset operating frequency, and determine the parasitic resistance of the target capacitor as the parasitic resistance of the capacitor in the wireless power transfer system.

8. A working frequency determination device, characterized in that, When applied to a wireless power transfer system, it includes: An acquisition module, configured to acquire a first response function and a second response function of the wireless power transfer system, wherein the first response function represents the relationship between the parasitic resistance of the coil and the operating frequency in the wireless power transfer system; the second response function represents the relationship between the parasitic resistance of the capacitor and the operating frequency in the wireless power transfer system; A processing module, configured to determine a target mesh current equation according to the first response function, the second response function, and the equivalent circuit model corresponding to the wireless power transfer system; and determine the actual operating frequency of the wireless power transfer system according to the target mesh current equation.

9. An electronic device, characterized in that, It includes: A memory, a processor; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory, so that the processor executes the method according to any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer execution instructions, and when the computer execution instructions are executed, they are used to implement the method according to any one of claims 1-7.

11. A computer program product, characterized in that, It includes a computer program, and when the computer program is executed, it implements the method according to any one of claims 1-7.

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