A method for constructing a dual-load wireless power transmission rectangular coil

Abstract

The application relates to a double-load wireless power transmission rectangular coil construction method, which is characterized by a transmission coil inductance target value range, a receiving coil inductance target value range and a receiving coil external size target length-width ratio value range q To meet the requirements, specific steps A to D are performed, a mathematical model of the size relationship between the transmission coil and the receiving coil is constructed, a data surface model containing each turn surface under network training is constructed, the relationship between the two is combined, and the transmission coil and the receiving coil meeting the preset requirements are constructed. The whole design can effectively improve the accuracy and standardization of the coil design, and has important application value in the design of a multi-load wireless power transmission system.

Description

Technical Field

[0001] This invention relates to a method for constructing a rectangular coil for dual-load wireless power transmission, belonging to the field of wireless power transmission technology. Background Technology

[0002] Wireless power transfer technology utilizes electromagnetic fields to transmit energy, achieving physical isolation between the device and the power source. It is characterized by safety, flexibility, and strong environmental adaptability, effectively avoiding various problems associated with cables and connecting components. It has been widely applied across various industries and is gradually entering people's daily lives, including implantable medical devices, portable electronic products, home appliances, and electric vehicles. A well-designed coupling coil is crucial for a wireless power transfer system; a coil with high-efficiency transmission capability is essential for achieving efficient and reliable wireless power transfer. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for constructing a rectangular coil for dual-load wireless power transmission. The method adopts a novel design strategy and can achieve reliable and stable energy transmission for dual-load wireless power transmission systems.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention designs a method for constructing a rectangular coil for dual-load wireless power transmission, which is used to construct a transmitting coil and a receiving coil that meet the preset requirements of the target value range of the transmitting coil inductance, the target value range of the receiving coil inductance, and the target aspect ratio range q of the external dimensions of the receiving coil. The method includes the following steps:

[0005] Step A. For the transmitting and receiving coils in co-axial dual-load wireless power transmission, determine the coil wire diameter R and coil turn spacing d, establish a mathematical model of the dimensional relationship between the transmitting and receiving coils, and then proceed to Step B;

[0006] Step B. Based on first training an inductance prediction model with coil turns n, inner width a, and inner length b as inputs and coil inductance L as output, and then obtaining a dataset of coil inductances corresponding to coils of different sizes through the inductance prediction model, and then constructing a data surface model containing the surface of each number of turns, constructing a data surface model containing the target value range of the transmitting coil inductance and the target value range of the receiving coil inductance, and then proceeding to step C;

[0007] Step C. Based on the update of the system resonant frequency, determine the receiving coil inductance value L2 according to the target range of the receiving coil inductance, and extract the size relationship curve RX of each receiving coil corresponding to the receiving coil inductance value L2 within the data surface model. Combined with the mathematical model of the size relationship between the transmitting coil and the receiving coil, obtain the size relationship curve TX of each transmitting coil that satisfies the target range of the transmitting coil inductance, and then obtain the size range curve RX of each receiving coil that satisfies the target aspect ratio range q of the receiving coil's external dimensions. end And the corresponding transmit coil size range curves TX. end Then proceed to step D;

[0008] Step D. Using the RX curve for each receiver coil size range end And the corresponding transmit coil size range curves TX. end Based on this, the transmitting coil and receiving coil are constructed.

[0009] As a preferred embodiment of the present invention, step A includes the following:

[0010] Based on the actual power level range, with a preset margin to match the coil specifications, determine the coil wire diameter R, and based on the coil wire insulation thickness d1 and the overall spacing between adjacent coil wires d2, determine the coil turn spacing d according to the following formula;

[0011] d = 2 * d1 + d2

[0012] When the number of coil turns is n, the total coil width w n Represented as:

[0013] w n = n*(R+2d1)+(n-1)*d2

[0014] For co-axial, off-axis, dual-load wireless power transmission, the mathematical model establishing the dimensional relationship between the transmitting and receiving coils is as follows:

[0015] Based on the premise that the total turns width and the outermost turns width of the transmitting coil and the receiving coil are the same, and that the outermost turns length of the transmitting coil is twice the outermost turns length of the receiving coil, as shown in the following formula:

[0016]

[0017] Among them, a rx and b rx These represent the width and length of the innermost turn of the receiving coil, respectively. tx and b tx These represent the width and length of the innermost turn of the transmitting coil, respectively; A rx and B rxA represents the width and length of the outermost turn of the receiving coil, respectively. tx and B tx These represent the width and length of the outermost turn of the transmitting coil, respectively.

[0018] Further results were obtained as follows:

[0019]

[0020] As a preferred embodiment of the present invention: In step B, the initial coil size range is determined by performing the following steps B1 to B3:

[0021] Step B1. Obtain a preset number of sample data within the coil size range. Each sample data includes the number of coil turns n, the inner width a of the rectangular coil, the inner length b of the rectangular coil, and the corresponding coil inductance L. Then proceed to step B2.

[0022] Step B2. Based on the sample data and the preset target discrimination accuracy, train the network to be trained to obtain an inductance prediction model with the number of coil turns n, the inner width of the rectangular coil a, and the inner length of the rectangular coil b as inputs and the coil inductance L as output. Then proceed to step B3.

[0023] Step B3. Based on the inductance prediction model, obtain the dataset consisting of the coil inductance L corresponding to different sizes of coils within the coil size range. Then, construct a data surface model containing the surface of each number of turns corresponding to the coil size range. Determine whether the target value range of the transmitting coil inductance and the target value range of the receiving coil inductance are both located in the data surface model. If yes, proceed to step C; otherwise, expand and update the coil size range according to the preset expansion and update rules, and return to step B1.

[0024] As a preferred technical solution of the present invention: in step B1, a preset number of sample data within the coil size range is obtained through finite element electromagnetic simulation (FEM), and in step B2, the network to be trained is a neural network.

[0025] As a preferred technical solution of the present invention: step C includes the following steps C1 to C6;

[0026] Step C1. Initialize the system resonant frequency f, and proceed to step C2;

[0027] Step C2. Based on the preset resonant capacitor C of each receiver and the system resonant frequency f, randomly obtain the desired resonant frequency f. And the receiving coil inductance value L2 within the target range of the receiving coil inductance, and then proceed to step C3;

[0028] Step C3. Extract the curve RX corresponding to the size relationship of each receiving coil corresponding to the inductance value L2 of the receiving coil from the data surface model, and then proceed to step C4;

[0029] Step C4. For each receiving coil size relationship curve RX, determine the innermost turn width 'a' of the receiving coil corresponding to the receiving coil size relationship curve RX within the turn number surface. rx The range and the innermost turn length b rx Within the range, combined with the mathematical model of the size relationship between the transmitting coil and the receiving coil, the transmitting coil size relationship curve TX corresponding to the receiving coil size relationship curve RX within the surface of the number of turns is obtained; then the transmitting coil size relationship curve TX corresponding to each receiving coil size relationship curve RX is obtained, and then proceed to step C5;

[0030] Step C5. Determine whether any of the obtained transmitting coil size relationship curves TX are within the target range of transmitting coil inductance. If so, obtain each transmitting coil size relationship curve TX within the target range of transmitting coil inductance, and the corresponding receiving coil size relationship curve RX, as the transmitting coil size relationship curves TX and RX to be analyzed, and then proceed to step C6; otherwise, update the system resonant frequency f according to the preset resonant frequency update rule, and return to step C2.

[0031] Step C6. Based on the target length-to-width ratio range q of the receiving coil's external dimensions, i.e., the range B of the ratio of the outermost turn's side length to its outermost turn's side width. rx :A rx =q, determine whether there exists a range of receiving coil size curves RX and TX on each receiving coil size relationship curve to be analyzed that satisfy q. end and its corresponding transmitting coil size range curve TX end Then, the curves RX for each receiving coil size range satisfying q are obtained. end And the corresponding transmit coil size range curves TX. end Then proceed to step D; otherwise, update the system resonant frequency f according to the preset resonant frequency update rule and return to step C2.

[0032] As a preferred technical solution of the present invention: the receiving coil size range curves RX obtained in step C that satisfy the target aspect ratio range q of the receiving coil's external dimensions. end And the corresponding transmit coil size range curves TX. end In the middle, according to the range B of the ratio of the outermost turn's side length to its outermost turn's side width of the receiving coil. rx :A rx= q, where the following formula is satisfied:

[0033]

[0034] Among them, a rxq a represents the inner width of the receiving coil that meets the target aspect ratio range q for the external dimensions of the receiving coil. txq a represents the inner width of the transmitting coil that meets the target aspect ratio range q for the external dimensions of the transmitting coil. rxq =a txq b rxq b represents the inner length of the receiving coil that meets the target aspect ratio range q for the external dimensions of the receiving coil. txq w represents the inner length of the transmitting coil that meets the target aspect ratio range q for the external dimensions of the transmitting coil. n Indicates the total turns width of the coil, A rx and B rx These represent the width and length of the outermost turn of the receiving coil, respectively.

[0035] The method for constructing a dual-load wireless power transfer rectangular coil described in this invention, compared with the prior art, has the following technical advantages:

[0036] (1) The dual-load wireless power transmission rectangular coil construction method designed in this invention takes the target value range of the transmitting coil inductance, the target value range of the receiving coil inductance, and the target length-to-width ratio range q of the external dimensions of the receiving coil as requirements. It executes specific steps A to D. By constructing a mathematical model of the size relationship between the transmitting coil and the receiving coil, and constructing a data surface model containing the number of turns under network training, and combining the relationship between the two, a transmitting coil and a receiving coil that meet the preset requirements are constructed. The whole design can effectively improve the accuracy and standardization of coil design and has important application value in the design of multi-load wireless power transmission systems. Attached Figure Description

[0037] Figure 1 This is a flowchart of the method for constructing a dual-load wireless power transmission rectangular coil according to the present invention;

[0038] Figure 2 This is a diagram of the overall coil structure of the dual-load wireless power transmission system of the present invention;

[0039] Figure 3 This is a cross-sectional view of adjacent coils in the dual-load wireless power transmission system of the present invention;

[0040] Figure 4 It is an ANN inductance training model;

[0041] Figure 5 This is a schematic diagram of the data surface model containing the number of turns of the surface in the design of this invention;

[0042] Figure 6 (a) is the value of the receiving coil inductance determined and then extracted from the data model. Figure 6 (b) is Figure 5 The corresponding two-dimensional plan view;

[0043] Figure 7 (a) is the TX dimension diagram corresponding to RX. Figure 7 (b) is a data model diagram for verifying whether the required TX is within the range of the target value of the transmitting coil inductance;

[0044] Figure 8 It is a set of corresponding RX in the data model end With TX end picture.

[0045] Where a represents the width of the innermost turn of the coil, and b represents the width of the innermost turn of the coil. Detailed Implementation

[0046] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0047] Wireless power transfer systems based on dual-load access are an extension of traditional one-to-one systems, capable of powering more loads while reducing the number of power sources in the system. Rectangular coils have a larger coupling area compared to circular coils of the same horizontal and vertical dimensions. In some practical applications, the space left for power coil design may require specific shapes other than spirals and squares; in such cases, rectangular coils are a more suitable and advantageous choice.

[0048] This invention presents a method for constructing a rectangular coil for dual-load wireless power transmission. This method is used to construct transmitting and receiving coils that meet preset requirements, including the target inductance range of the transmitting coil, the target inductance range of the receiving coil, and the target aspect ratio range q of the receiving coil's external dimensions. Figure 1 As shown, the process includes performing steps A through D.

[0049] Step A. For the transmitting and receiving coils in co-axial dual-load wireless power transmission, determine the coil wire diameter R and coil turn spacing d, establish a mathematical model of the dimensional relationship between the transmitting and receiving coils, and then proceed to Step B.

[0050] In practical applications, step A above specifically includes the following:

[0051] Based on the actual power rating range, a preset margin is allowed to match the coil specifications, determining the coil conductor diameter R, and considering the coil conductor insulation thickness d1 and the overall spacing d2 between adjacent coil conductors, as follows: Figure 3As shown, the coil turn spacing d is determined according to the following formula;

[0052] d = 2 * d1 + d2

[0053] When the number of coil turns is n, the total coil width w n Represented as:

[0054] w n = n*(R+2d1)+(n-1)*d2

[0055] For co-axial, off-axis, dual-load wireless power transmission, the mathematical model establishing the dimensional relationship between the transmitting and receiving coils is as follows:

[0056] Based on the premise that the total turns width and the outermost turns width of the transmitting coil and the receiving coil are the same, and that the outermost turns length of the transmitting coil is twice the outermost turns length of the receiving coil, such as Figure 2 As shown, the formula is as follows:

[0057]

[0058] Among them, a rx and b rx These represent the width and length of the innermost turn of the receiving coil, respectively. tx and b tx These represent the width and length of the innermost turn of the transmitting coil, respectively; A rx and B rx A represents the width and length of the outermost turn of the receiving coil, respectively. tx and B tx These represent the width and length of the outermost turn of the transmitting coil, respectively.

[0059] Further results were obtained as follows:

[0060]

[0061] Step B. Based on first training an inductance prediction model with the number of coil turns n, the inner width a of the rectangular coil, and the inner length b of the rectangular coil as inputs and the coil inductance L as output, and then obtaining the dataset of corresponding coil inductances under different coil sizes through the inductance prediction model, and then constructing a data surface model containing the surface of each number of turns, constructing a data surface model containing the target value range of the transmitting coil inductance and the target value range of the receiving coil inductance, and then proceeding to step C.

[0062] In practical applications, the initial coil size range in step B above is determined by steps B1 to B3.

[0063] Step B1. Obtain a preset number of sample data within the coil size range through finite element electromagnetic simulation (FEM). Each sample data includes the number of coil turns n, the inner width a of the rectangular coil, the inner length b of the rectangular coil, and the corresponding coil inductance L. Then proceed to step B2.

[0064] Step B2. Based on the data from each sample, and combined with a preset target discrimination accuracy of 98%, targeting, for example... Figure 4 The neural network to be trained is trained to obtain an inductance prediction model with the number of coil turns n, the inner width a of the rectangular coil, and the inner length b of the rectangular coil as inputs and the coil inductance L as output, and then proceeds to step B3.

[0065] Step B3. Based on the inductance prediction model, obtain the dataset consisting of the coil inductance L corresponding to different sizes of coils within the coil size range, and then construct a data surface model containing the surface of each number of turns corresponding to the coil size range, such as... Figure 5 As shown, it determines whether the target value range of the transmitting coil inductance and the target value range of the receiving coil inductance are both located in the data surface model. If so, proceed to step C; otherwise, expand and update the coil size range according to the preset expansion and update rules, and return to step B1.

[0066] Step C. Based on the update of the system resonant frequency, determine the receiving coil inductance value L2 according to the target range of the receiving coil inductance, and extract the size relationship curve RX of each receiving coil corresponding to the receiving coil inductance value L2 within the data surface model. Combined with the mathematical model of the size relationship between the transmitting coil and the receiving coil, obtain the size relationship curve TX of each transmitting coil that satisfies the target range of the transmitting coil inductance, and then obtain the size range curve RX of each receiving coil that satisfies the target aspect ratio range q of the receiving coil's external dimensions. end And the corresponding transmit coil size range curves TX. end Then proceed to step D.

[0067] In practical applications, step C above is specifically designed to be executed as follows: steps C1 to C6.

[0068] Step C1. Initialize the system resonant frequency f and proceed to step C2.

[0069] Step C2. Based on the preset resonant capacitor C of each receiver and the system resonant frequency f, randomly obtain the desired resonant frequency f. And the receiving coil inductance value L2 within the target range of the receiving coil inductance, and then proceed to step C3.

[0070] Step C3. Extract the curve RX corresponding to the size relationship of each receiving coil from the data surface model, where the inductance value L2 of the receiving coil is located. Figure 6As shown in (a), proceed to step C4.

[0071] Step C4. For each receiving coil size relationship curve RX, determine the innermost turn width 'a' of the receiving coil corresponding to the receiving coil size relationship curve RX within the turn number surface. rx The range and the innermost turn length b rx The range, such as Figure 6 As shown in (b), by combining the mathematical model of the dimensional relationship between the transmitting coil and the receiving coil, the transmitting coil dimensional relationship curve TX corresponding to the receiving coil dimensional relationship curve RX within the surface of the number of turns is obtained, as follows: Figure 7 As shown in (a); then obtain the transmitting coil size relationship curve TX corresponding to the receiving coil size relationship curve RX of each receiving coil, and then proceed to step C5.

[0072] Step C5. Determine whether any of the obtained transmitter coil size relationship curves TX exist within the target value range of the transmitter coil inductance. Figure 7 As shown in (b), if the inductance of the transmitting coil is within the target range, the size relationship curves TX of each transmitting coil and the corresponding size relationship curves RX of the receiving coil are obtained as the size relationship curves TX and RX of each transmitting coil to be analyzed, and then proceed to step C6; otherwise, the system resonant frequency f is updated according to the preset resonant frequency update rule, and the process returns to step C2.

[0073] Step C6. Based on the target length-to-width ratio range q of the receiving coil's external dimensions, i.e., the range B of the ratio of the outermost turn's side length to its outermost turn's side width. rx :A rx =q, determine whether there exists a range of receiving coil size curves RX and TX on each receiving coil size relationship curve to be analyzed that satisfy q. end and its corresponding transmitting coil size range curve TX end Then, the curves RX for each receiving coil size range satisfying q are obtained. end And the corresponding transmit coil size range curves TX. end ,like Figure 8 As shown, proceed to step D; otherwise, update the system resonant frequency f according to the preset resonant frequency update rule, and return to step C2.

[0074] Regarding the curves RX for each receiver coil size range that satisfy the target aspect ratio range q for the external dimensions of the receiver coil. end And the corresponding transmit coil size range curves TX. end In the middle, according to the range B of the ratio of the outermost turn's side length to its outermost turn's side width of the receiving coil.rx :A rx = q, where the following formula is satisfied:

[0075]

[0076] Among them, a rxq a represents the inner width of the receiving coil that meets the target aspect ratio range q for the external dimensions of the receiving coil. txq a represents the inner width of the transmitting coil that meets the target aspect ratio range q for the external dimensions of the transmitting coil. rxq =a txq b rxq b represents the inner length of the receiving coil that meets the target aspect ratio range q for the external dimensions of the receiving coil. txq w represents the inner length of the transmitting coil that meets the target aspect ratio range q for the external dimensions of the transmitting coil. n Indicates the total turns width of the coil, A rx and B rx These represent the width and length of the outermost turn of the receiving coil, respectively.

[0077] Step D. Using the RX curve for each receiver coil size range end And the corresponding transmit coil size range curves TX. end Based on this, the transmitting coil and receiving coil are constructed.

[0078] The dual-load wireless power transmission rectangular coil construction method designed in the above technical solution takes the target value range of the transmitting coil inductance, the target value range of the receiving coil inductance, and the target aspect ratio range q of the receiving coil as requirements. It executes specific steps A to D, constructs a mathematical model of the dimensional relationship between the transmitting and receiving coils, and constructs a data surface model containing the surface of each number of turns under network training. Combining the relationship between the two, a transmitting and receiving coil that meets the preset requirements is constructed. The entire design can effectively improve the accuracy and standardization of coil design and has important application value in the design of multi-load wireless power transmission systems.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for constructing a dual-load wireless power transfer rectangular coil, characterized in that: To construct a transmitting coil and a receiving coil that meet the preset requirements for the target range of the transmitting coil inductance, the target range of the receiving coil inductance, and the target aspect ratio range q of the receiving coil's external dimensions, the following steps are included: Step A. For the transmitting and receiving coils in co-axial dual-load wireless power transmission, determine the coil wire diameter R and coil turn spacing d, establish a mathematical model of the dimensional relationship between the transmitting and receiving coils, and then proceed to Step B; Step B. Based on first training an inductance prediction model with coil turns n, inner width a, and inner length b as inputs and coil inductance L as output, and then obtaining a dataset of coil inductances corresponding to coils of different sizes through the inductance prediction model, and then constructing a data surface model containing the surface of each number of turns, constructing a data surface model containing the target value range of the transmitting coil inductance and the target value range of the receiving coil inductance, and then proceeding to step C; Step C. Based on the update of the system resonant frequency, determine the receiving coil inductance value L2 according to the target range of the receiving coil inductance, and extract the size relationship curve RX of each receiving coil corresponding to the receiving coil inductance value L2 within the data surface model. Combined with the mathematical model of the size relationship between the transmitting coil and the receiving coil, obtain the size relationship curve TX of each transmitting coil that satisfies the target range of the transmitting coil inductance, and then obtain the size range curve RX of each receiving coil that satisfies the target aspect ratio range q of the receiving coil's external dimensions. end And the corresponding transmit coil size range curves TX. end Then proceed to step D; Step D. Using the RX curve for each receiving coil size range end And the corresponding transmit coil size range curves TX. end Based on this, the transmitting coil and receiving coil are constructed.

2. The method for constructing a dual-load wireless power transfer rectangular coil according to claim 1, characterized in that: Step A includes the following: Based on the actual power level range, with a preset margin to match the coil specifications, determine the coil wire diameter R, and based on the coil wire insulation thickness d1 and the overall spacing between adjacent coil wires d2, determine the coil turn spacing d according to the following formula; d = 2 * d1 + d2 When the number of coil turns is n, the total coil width w n Represented as: w n =n*(R+2d1)+(n-1)*d2 For co-axial, off-axis dual-load wireless power transmission, the mathematical model establishing the dimensional relationship between the transmitting and receiving coils is as follows: Based on the premise that the total turns width and the outermost turns width of the transmitting and receiving coils are identical, and that the outermost turns length of the transmitting coil is twice the outermost turns length of the receiving coil, as shown in the following formula: Among them, a rx and b rx These represent the width and length of the innermost turn of the receiving coil, respectively. tx and b tx These represent the width and length of the innermost turn of the transmitting coil, respectively; A rx and B rx A represents the width and length of the outermost turn of the receiving coil, respectively. tx and B tx These represent the width and length of the outermost turn of the transmitting coil, respectively. Further results were obtained as follows:

3. The method for constructing a dual-load wireless power transfer rectangular coil according to claim 1, characterized in that: In step B, the initial coil size range is determined by steps B1 to B3 as follows: Step B1. Obtain a preset number of sample data within the coil size range. Each sample data includes the number of coil turns n, the inner width a of the rectangular coil, the inner length b of the rectangular coil, and the corresponding coil inductance L. Then proceed to step B2. Step B2. Based on the sample data and the preset target discrimination accuracy, train the network to be trained to obtain an inductance prediction model with the number of coil turns n, the inner width of the rectangular coil a, and the inner length of the rectangular coil b as inputs and the coil inductance L as output. Then proceed to step B3. Step B3. Based on the inductance prediction model, obtain the dataset consisting of the coil inductance L corresponding to different sizes of coils within the coil size range. Then, construct a data surface model containing the surface of each number of turns corresponding to the coil size range. Determine whether the target value range of the transmitting coil inductance and the target value range of the receiving coil inductance are both located in the data surface model. If yes, proceed to step C; otherwise, expand and update the coil size range according to the preset expansion and update rules, and return to step B1.

4. The method for constructing a dual-load wireless power transfer rectangular coil according to claim 3, characterized in that: In step B1, a preset number of sample data within the coil size range are obtained through finite element electromagnetic simulation (FEM), and in step B2, the network to be trained is a neural network.

5. The method for constructing a dual-load wireless power transfer rectangular coil according to claim 1, characterized in that: Step C includes the following steps C1 to C6; Step C1. Initialize the system resonant frequency f, and proceed to step C2; Step C2. Based on the preset resonant capacitor C of each receiver and the system resonant frequency f, randomly obtain the desired resonant frequency f. And the receiving coil inductance value L2 within the target range of the receiving coil inductance, and then proceed to step C3; Step C3. Extract the curve RX corresponding to the size relationship of each receiving coil corresponding to the inductance value L2 of the receiving coil from the data surface model, and then proceed to step C4; Step C4. For each receiving coil size relationship curve RX, determine the innermost turn width 'a' of the receiving coil corresponding to the receiving coil size relationship curve RX within the turn number surface. rx The range and the innermost turn length b rx Within the range, combined with the mathematical model of the size relationship between the transmitting coil and the receiving coil, the transmitting coil size relationship curve TX corresponding to the receiving coil size relationship curve RX within the surface of the number of turns is obtained; then the transmitting coil size relationship curve TX corresponding to each receiving coil size relationship curve RX is obtained, and then proceed to step C5; Step C5. Determine whether any of the obtained transmitting coil size relationship curves TX are within the target range of transmitting coil inductance. If so, obtain each transmitting coil size relationship curve TX within the target range of transmitting coil inductance, and the corresponding receiving coil size relationship curve RX, as the transmitting coil size relationship curves TX and RX to be analyzed, and then proceed to step C6; otherwise, update the system resonant frequency f according to the preset resonant frequency update rule, and return to step C2. Step C6. Based on the target length-to-width ratio range q of the receiving coil's external dimensions, i.e., the range B of the ratio of the outermost turn's side length to its outermost turn's side width. rx :A rx =q, determine whether there exists a range of receiving coil size curves RX and TX on each receiving coil size relationship curve to be analyzed that satisfy q. end and its corresponding transmitting coil size range curve TX end Then, the curves RX for each receiving coil size range satisfying q are obtained. end And the corresponding transmit coil size range curves TX. end Then proceed to step D; otherwise, update the system resonant frequency f according to the preset resonant frequency update rule and return to step C2.

6. The method for constructing a dual-load wireless power transfer rectangular coil according to claim 1, characterized in that: The receiving coil size range curves RX obtained in step C that satisfy the target aspect ratio range q of the receiving coil's external dimensions are... end And the corresponding transmit coil size range curves TX. end In the middle, according to the range B of the ratio of the outermost turn's side length to its outermost turn's side width of the receiving coil. rx :A rx = q, where the following formula is satisfied: Among them, a rxq a represents the inner width of the receiving coil that meets the target aspect ratio range q for the external dimensions of the receiving coil. txq a represents the inner width of the transmitting coil that meets the target aspect ratio range q for the external dimensions of the transmitting coil. rxq =a txq b rxq b represents the inner length of the receiving coil that meets the target aspect ratio range q for the external dimensions of the receiving coil. txq w represents the inner length of the transmitting coil that meets the target aspect ratio range q for the external dimensions of the transmitting coil. n Indicates the total turns width of the coil, A rx and B rx These represent the width and length of the outermost turn of the receiving coil, respectively.

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