Positioning method, device and equipment for multiple transmitting coils in an inductive wireless charging system, storage medium and computer program

Abstract

The present disclosure relates to the technical field of wireless charging, in particular to a positioning method and device of multiple transmitting coils in an inductive wireless charging system, an apparatus, a storage medium and a computer program, the inductive wireless charging system comprising a receiving coil, the positioning method comprising: calculating a coupling coefficient between each of the multiple transmitting coils and the receiving coil according to self-inductance of the multiple transmitting coils, self-inductance of the receiving coil, and mutual inductance between each of the multiple transmitting coils and the receiving coil; determining a target transmitting coil from the multiple transmitting coils according to the coupling coefficient between each of the multiple transmitting coils and the receiving coil; determining a transmission efficiency between the target transmitting coil and the receiving coil; and calculating a corresponding side length and offset of the target transmitting coil according to the transmission efficiency when the transmission efficiency meets a preset efficiency condition.

Description

Technical Field

[0001] This disclosure relates to the field of wireless charging technology, and in particular to a method, apparatus, device, storage medium, and computer program for locating multiple transmitting coils in an inductive wireless charging system. Background Technology

[0002] Wireless charging, also known as wireless power transfer or inductive charging, is a technology that can charge devices without a physical connection. In other words, electricity is transferred from the power source to the receiving device through electromagnetic fields or electromagnetic waves. It has promising applications in rail transit and railway locomotives.

[0003] Wireless charging systems typically consist of the following main components: a transmitting coil, which is connected to a power source and is responsible for generating an electromagnetic field; and a receiving coil, which is connected to the device that needs to be charged and is responsible for capturing energy from the electromagnetic field.

[0004] In traditional inductive wireless power transfer systems, to improve energy transfer efficiency, methods such as increasing the area of ​​a single transmitting coil or increasing the number of transmitting and receiving coils are often used to reduce energy drop caused by gaps between the transmitting and receiving coils. Increasing the area of ​​a single transmitting coil places high demands on the size and positional accuracy of the receiving coil, and also exacerbates detuning problems caused by foreign objects falling into the coil. Increasing the number of transmitting and receiving coils increases design complexity, and improper design may affect charging efficiency. Therefore, how to design the transmitting coil while ensuring charging efficiency has become an urgent problem to be solved. Summary of the Invention

[0005] This disclosure provides a method, apparatus, device, storage medium, and computer program for locating multiple transmitting coils in an inductive wireless charging system, which can solve the technical problem of how to adjust the size and position of the transmitting coils to ensure charging efficiency.

[0006] In a first aspect, this disclosure provides a positioning method for multiple transmitting coils in an inductive wireless charging system, the inductive wireless charging system including receiving coils, and the positioning method comprising:

[0007] Calculate the coupling coefficients between the multiple transmitting coils and the receiving coil based on the self-inductance of the multiple transmitting coils, the self-inductance of the receiving coil, and the mutual inductance between the multiple transmitting coils and the receiving coil.

[0008] Based on the coupling coefficients between multiple transmitting coils and receiving coils, the target transmitting coil is determined from the multiple transmitting coils. The coupling coefficient between the target transmitting coil and the receiving coil is greater than the coupling coefficients between other transmitting coils and the receiving coil.

[0009] Determine the transmission efficiency between the target transmitting coil and the receiving coil;

[0010] When the transmission efficiency meets the preset efficiency condition, the side length and offset of the target transmitting coil are calculated based on the transmission efficiency. The side length and offset of the target transmitting coil are related to the mutual inductance between the target transmitting coil and the receiving coil. The offset is used to represent the positional offset of the target transmitting coil relative to the receiving coil.

[0011] In some embodiments, the side length and offset of the target transmitting coil and the mutual inductance between the target transmitting coil and the receiving coil satisfy the following expression:

[0012] ;

[0013] ;

[0014] ;

[0015] in, M This represents the mutual inductance between the target transmitting coil and the receiving coil; x 1 represents the horizontal coordinate of the center point of the target's transmitting coil. x 2 represents the horizontal coordinates of the center point of the receiving coil; This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. , These are the number of turns of the target transmitting coil and the receiving coil, respectively. It represents the vacuum permeability.

[0016] In some embodiments, the transmission efficiency between the target transmitting coil and the receiving coil satisfies the following expression:

[0017]

[0018] in, I The loop current of the target transmitting coil. For the loop current of the receiving coil, The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil.

[0019] In some embodiments, the method further includes:

[0020] Calculate the total impedance of the transmitting circuit of multiple transmitting coils and the receiving circuit of the receiving coil;

[0021] According to Kirchhoff's voltage theorem, the target matrix is ​​calculated based on the total impedance of each of the multiple transmitting and receiving coils. The target matrix is ​​used to represent the relationship between the total impedance of each of the multiple transmitting and receiving coils, the input voltage of the multiple transmitting coils, the loop current of the multiple transmitting coils, and the loop current of the receiving coil.

[0022] Solve the target matrix to obtain the loop current expressions for multiple transmitting coils and the loop current expressions for the receiving coil.

[0023] In some embodiments, calculating the side length and offset corresponding to the target transmitting coil based on the transmission efficiency includes:

[0024] The loop current expression of the target transmitting coil is determined from the loop current expressions of multiple transmitting coils. The loop current expression of the target transmitting coil is related to the mutual inductance between the target transmitting coil and the receiving coil.

[0025] The loop current expressions for the target transmitting coil and the receiving coil are input into the transmission efficiency expression for calculation, thereby obtaining the side length and offset of the target transmitting coil.

[0026] In some embodiments, the side length and offset of the target transmitting coil satisfy the following expression:

[0027] ;

[0028] ;

[0029] ;

[0030] ;

[0031] in, A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. The inductance of the target transmitting coil, For the inductance of the receiving coil, The resonant capacitance of the target transmitting coil. The resonant capacitance of the receiving coil. The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil. This is the equivalent load resistance. For the transmission efficiency between the target transmitting coil and the receiving coil, It is the resonant angular frequency.

[0032] Secondly, this disclosure provides a positioning device for a multi-transmitting coil in an inductive wireless charging system. The inductive wireless charging system includes a receiving coil, and the positioning device includes:

[0033] The calculation unit is used to calculate the coupling coefficient between the multiple transmitting coils and the receiving coil based on the self-inductance of the multiple transmitting coils, the self-inductance of the receiving coil, and the mutual inductance between the multiple transmitting coils and the receiving coil.

[0034] The determining unit is used to determine the target transmitting coil from multiple transmitting coils based on the coupling coefficients between the multiple transmitting coils and the receiving coils respectively, wherein the coupling coefficient between the target transmitting coil and the receiving coil is greater than the coupling coefficient between the non-target transmitting coil and the receiving coil;

[0035] The computing unit is also used to determine the transmission efficiency between the target transmitting coil and the receiving coil;

[0036] The calculation unit is also used to calculate the side length and offset of the target transmitting coil based on the transmission efficiency, provided that the transmission efficiency meets the preset efficiency condition. The side length and offset of the target transmitting coil are related to the mutual inductance between the target transmitting coil and the receiving coil. The offset is used to represent the positional offset of the target transmitting coil relative to the receiving coil.

[0037] Thirdly, this disclosure provides a computer device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the foregoing aspects.

[0038] Fourthly, this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the methods described in the above aspects.

[0039] Fifthly, this disclosure provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the methods described in the foregoing aspects.

[0040] This disclosure provides a method, apparatus, device, storage medium, and computer program for locating multiple transmitting coils in an inductive wireless charging system. By comparing the coupling coefficients of multiple transmitting coils with the receiving coil, the transmitting coil with the larger coupling coefficient is selected as the target transmitting coil, ensuring that energy is transferred more efficiently from the transmitting coil to the receiving coil. Then, under the condition that the transmission efficiency meets a certain preset efficiency condition, the geometric dimensions of the target transmitting coil and its relative position with the receiving coil are calculated in reverse, thereby determining the specific geometric dimensions and position of the target transmitting coil. That is, based on the known transmission efficiency, the optimal relative position and size between the transmitting coil and the receiving coil are determined more accurately. Applying the calculated geometric dimensions and position of the transmitting coil to the wireless charging system can ensure that the charging process is carried out efficiently. Attached Figure Description

[0041] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0042] Figure 1 A flowchart illustrating a positioning method for multiple transmitting coils in an inductive wireless charging system provided in this embodiment of the present disclosure;

[0043] Figure 2 This is a schematic diagram of the arrangement of a transmitting coil and a receiving coil provided in an embodiment of this disclosure;

[0044] Figure 3 This is an equivalent circuit diagram of a transmitting coil and a receiving coil provided in an embodiment of this disclosure;

[0045] Figure 4 This is a schematic diagram of the structure of a positioning device with multiple transmitting coils in an inductive wireless charging system provided in this embodiment of the present disclosure;

[0046] Figure 5 This is a schematic diagram of the structure of a computer device provided in an embodiment of this disclosure.

[0047] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation

[0048] To enable those skilled in the art to better understand the technical solutions of this disclosure, and to fully understand and implement the process of how this disclosure applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. The embodiments of this disclosure and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort should fall within the protection scope of this disclosure.

[0049] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0050] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0051] Example 1

[0052] Figure 1 This is a flowchart illustrating a positioning method for multiple transmitting coils in an inductive wireless charging system provided in this disclosure. Figure 1 As shown, the method includes the following steps S101 to S104.

[0053] S101. Calculate the coupling coefficients between the multiple transmitting coils and the receiving coil based on the self-inductance of the multiple transmitting coils, the self-inductance of the receiving coil, and the mutual inductance between the multiple transmitting coils and the receiving coil.

[0054] It is understood that the number of transmitting coils can be at least two, and the specific number can be set according to the actual situation, without limitation here.

[0055] As an example and not a limitation, the number of transmitting coils can be two, that is, the transmitting coils include a first transmitting coil and a second transmitting coil.

[0056] Figure 2 This is a schematic diagram of the arrangement of a transmitting coil and a receiving coil provided in an embodiment of this disclosure.

[0057] like Figure 2 As shown, there are two transmitting coils and one receiving coil. The transmitting coil uses a two-coil parallel structure, which is equivalent to a large coil and two small coils with overlapping parts.

[0058] Based on relevant electromagnetic principles, self-inductance refers to the induced electromotive force generated by a coil when its own current changes, i.e., the electromagnetic characteristics of the coil itself, which are related to the size, shape, and material of the coil. Mutual inductance refers to the ability of a change in the current of one coil to induce an electromotive force in the other coil, i.e., the electromagnetic coupling characteristics between the two coils, which are related to the relative position and direction of the coils. The coupling coefficient in a circuit represents the tightness of the coupling between components, and can be expressed by the following expression (1):

[0059] (1)

[0060] in, k Represents the coupling coefficient. M This represents the mutual inductance between the transmitting and receiving coils. The inductance of the first transmitting coil, The inductance of the second transmitting coil, The inductance of the receiving coil.

[0061] S102. Based on the coupling coefficients between the multiple transmitting coils and the receiving coil, determine the target transmitting coil from the multiple transmitting coils.

[0062] The coupling coefficient between the target transmitting coil and the receiving coil is greater than the coupling coefficient between other transmitting coils and the receiving coil.

[0063] In a wireless charging system, the coupling coefficient reflects the degree of energy coupling between the transmitting and receiving coils, indicating the efficiency of energy transfer between them. A higher coupling coefficient means better energy transfer efficiency and less energy loss. In other words, a high coupling coefficient helps to transfer more power to the receiving coil with the same input power, resulting in faster charging speeds.

[0064] When designing a wireless charging system, the coupling coefficient can be optimized by adjusting the relative position and orientation between the transmitting and receiving coils, thereby improving the performance of the entire wireless charging system.

[0065] Therefore, by comparing the coupling coefficients of multiple transmitting coils with the receiving coil and selecting the transmitting coil with the larger coupling coefficient as the target transmitting coil (assuming the first transmitting coil is selected as the target transmitting coil, then the second transmitting coil is not the target transmitting coil), energy transmission efficiency can be improved, ensuring that energy is transferred more effectively from the transmitting coil to the receiving coil and optimizing wireless charging efficiency.

[0066] In other words, selecting a target transmitting coil from among multiple transmitting coils can help optimize system design and ensure better system performance during operation. By choosing the right transmitting coil, designers can avoid unnecessary complexity and resource waste, thereby improving the overall availability of the system.

[0067] In some embodiments, such as mobile devices or variable load environments, dynamically adjusting the target transmitting coil based on real-time monitored coupling coefficients can improve system adaptability and flexibility, effectively address the impact of changes in distance, angle, or other external conditions, and ensure stable energy transmission.

[0068] S103. Determine the transmission efficiency between the target transmitting coil and the receiving coil.

[0069] Transmission efficiency is used to determine the proportion of energy loss during wireless power transmission and can reflect the effectiveness of power transmission.

[0070] In some embodiments, the transmission efficiency between the target transmitting coil and the receiving coil satisfies the following expression (2):

[0071] (2)

[0072] in, I The loop current of the target transmitting coil. For the loop current of the receiving coil, The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil.

[0073] As an example rather than a limitation, when the number of transmitting coils is two, the above formula (2) can be rewritten as follows:

[0074] ;

[0075] in, This is the loop current of the first transmitting coil. This is the loop current of the second transmitting coil. For the loop current of the receiving coil, Let be the equivalent resistance of the first transmitting coil. This is the equivalent resistance of the second transmitting coil. This is the equivalent resistance of the receiving coil.

[0076] This can also be understood as follows: when i is 1, the first transmitting coil is the target transmitting coil; when i is 2, the second transmitting coil is the target transmitting coil.

[0077] By calculating transmission efficiency, the performance of a wireless charging system can be comprehensively evaluated. Generally, high transmission efficiency means the system is highly efficient in energy transfer, ensuring that more input power is converted into usable output power. It can be understood that calculating transmission efficiency provides a basis for subsequent coil design optimization; that is, optimizing the coil design while ensuring that transmission efficiency meets certain conditions, thereby guaranteeing the overall energy efficiency of the wireless charging system.

[0078] S104. If the transmission efficiency meets the preset efficiency condition, calculate the side length and offset of the target transmitting coil based on the transmission efficiency.

[0079] Preset efficiency conditions refer to the numerical conditions that the transmission efficiency must meet. This can be either meeting a preset efficiency threshold or meeting a preset efficiency range. For example, a preset efficiency condition could mean that the transmission efficiency is greater than 90% (preset efficiency threshold), or it could mean that the transmission efficiency is within the range of 80% to 90%. The specific values ​​can be set according to the actual situation and are not limited here.

[0080] The side length and offset of the target transmitting coil are related to the mutual inductance between the target transmitting coil and the receiving coil. The offset represents the positional shift of the target transmitting coil relative to the receiving coil. Figure 2 As can be seen, the offset can be determined by calculating the coordinates between the center point of the transmitting coil and the set origin.

[0081] It is understandable that the geometry of the target transmitting coil and its relative position to the receiving coil can affect the self-inductance and mutual inductance of the coils, thus affecting the transmission efficiency between them.

[0082] By reverse-engineering the geometry of the target transmitting coil and its relative position to the receiving coil while ensuring the highest possible coupling coefficient and transmission efficiency, the specific geometry and position of the target transmitting coil are determined. In other words, based on the known transmission efficiency, the optimal relative position and size between the transmitting and receiving coils are precisely determined, thereby maximizing energy coupling. Applying the calculated geometry and position of the transmitting coil to the wireless charging system can improve the overall design quality of the system and ensure efficient operation under various conditions.

[0083] This method can calculate the appropriate coil size and position based on the set transmission efficiency, making the wireless charging system more adaptable, especially in dynamic environments or other applications that require frequent changes in operating status or environmental conditions (such as the use of wireless chargers on different models of devices).

[0084] The core of this application lies in calculating the lengths of the two transmitting coils analytically. Figure 2 The letter A in the diagram represents the width of the two transmitting coils. Figure 2 The design involves determining the relative positions of the two transmitting coils (represented by the letter B in the diagram) and the distance between the center point O of the right transmitting coil and the origin (the displacement of the center point O of the right transmitting coil from the origin can be considered as half the relative positions of the left and right transmitting coils). Since the two transmitting coils have the same length and width, calculating the length and width of one of the transmitting coils (let's assume it's the right transmitting coil) allows us to deduce the position of the left transmitting coil by calculating the offset of the right coil, and vice versa. Finally, by determining the length and width of each of the two sets of transmitting coils and their relative placement, the design of the entire transmitting coil group is complete.

[0085] In some embodiments, the side length and offset of the target transmitting coil and the mutual inductance between the target transmitting coil and the receiving coil satisfy the following expression:

[0086] (3)

[0087] (4)

[0088] (5)

[0089] in, M This represents the mutual inductance between the target transmitting coil and the receiving coil; x 1 represents the horizontal coordinate of the center point of the target's transmitting coil. x 2 represents the horizontal coordinates of the center point of the receiving coil; This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. , These are the number of turns of the target transmitting coil and the receiving coil, respectively. It represents the vacuum permeability.

[0090] Combining the expressions (1) to (5) above and related electrical principles, it can be understood that the transmission efficiency is related to the current in the target transmitting coil, the current is related to the mutual inductance between the target transmitting coil and the receiving coil, and the mutual inductance between the target transmitting coil and the receiving coil is related to the side length and offset of the target transmitting coil. Therefore, the transmission efficiency can be used to deduce the side length and offset of the target transmitting coil and solve the problem.

[0091] In other words, by inversely calculating the relationship between transmission efficiency and coil side length and offset, the required side length and offset of the target transmitting coil can be determined, thereby achieving quantitative analysis of the geometric characteristics of the target transmitting coil. This allows for optimization of coil layout and design in practical applications, improving the overall performance of the system.

[0092] Example 2

[0093] Based on the above embodiments, the following describes the calculation process of inversely inferring the relationship between transmission efficiency and coil side length and offset.

[0094] Figure 3 This is an equivalent circuit diagram of a transmitting coil and a receiving coil provided in an embodiment of this disclosure.

[0095] like Figure 3 As shown, , These are the input voltages of the two transmitting coils, respectively. , These are the loop currents of the two transmitting coils, respectively. For the loop current of the receiving coil, , These are the inductances of the two transmitting coils, For the receiving coil inductance, , These are the resonant capacitances of the two transmitting coils, The resonant capacitance of the receiving coil. , These are the equivalent resistances of the two transmitting coils, respectively. This is the equivalent resistance of the receiving coil. This is the equivalent load resistance.

[0096] In some embodiments, the method further includes: calculating the total impedance corresponding to the transmitting loop of the plurality of transmitting coils and the receiving loop of the receiving coil; calculating a target matrix based on the total impedance corresponding to the plurality of transmitting coils and the receiving coil according to Kirchhoff's voltage theorem, the target matrix being used to represent the relationship between the total impedance corresponding to the plurality of transmitting coils and the receiving coil, the input voltage of the plurality of transmitting coils, the loop current of the plurality of transmitting coils, and the loop current of the receiving coil; and solving the target matrix to obtain the loop current expressions of the plurality of transmitting coils and the loop current expressions of the receiving coil.

[0097] Calculating the total impedance of the transmitting and receiving coils is key to understanding the energy transfer efficiency of a wireless charging system. The total impedance includes the coil's resistance and reactance, which affect energy loss during transmission.

[0098] Kirchhoff's Voltage Law (KVL) is a fundamental law in circuit analysis, stating that in a closed loop, the sum of the voltages across all parts is zero. Using KVL to analyze the transmitting and receiving coil loops allows us to establish the relationship between voltage and current.

[0099] The target matrix represents the relationship between the transmitting and receiving coils, including parameters such as total impedance, input voltage, and loop current, and is used for further analysis and calculation. By solving the target matrix, the expressions for the loop currents of the transmitting and receiving coils can be obtained.

[0100] Calculating the loop current expressions for the transmitting coil and the receiving coil is the basis for accurately deriving the corresponding side length and offset of the target transmitting coil. Through precise calculation and analysis, the size and position of the transmitting coil in a wireless power transmission system can be better designed.

[0101] As an example, not a limitation, the definition , , The total impedances of the two transmitting loops and one receiving loop, respectively, satisfy the following expression:

[0102] (6)

[0103] (7)

[0104] (8)

[0105] in, j It indicates that it is an imaginary unit. It is the resonant angular frequency.

[0106] According to Kirchhoff's voltage theorem, analyzing the two transmitting coil circuits and one receiving coil circuit yields the following matrix:

[0107] (9)

[0108] Therefore, the current in each loop can be obtained as follows:

[0109] (10)

[0110] (11)

[0111] (12)

[0112] In some embodiments, calculating the side length and offset corresponding to the target transmitting coil based on the transmission efficiency includes: determining the loop current expression of the target transmitting coil from the loop current expressions of multiple transmitting coils, wherein the loop current expression of the target transmitting coil is related to the mutual inductance between the target transmitting coil and the receiving coil; inputting the loop current expression of the target transmitting coil and the loop current expression of the receiving coil into the transmission efficiency expression for calculation to obtain the side length and offset corresponding to the target transmitting coil.

[0113] It is understandable that there are two expressions for the loop current of the transmitting coil in the above text, namely Equation (10) and Equation (11). Since only one transmitting coil is in working state, it is only necessary to select the loop current expression corresponding to the target transmitting coil in working state. Then, the loop current expression of the target transmitting coil and the loop current expression of the receiving coil are input into the transmission efficiency expression, that is, Equation (10) and Equation (12) are input into Equation (2), or Equation (11) and Equation (11) are input into Equation (2) for reverse deduction. When the input efficiency is known, the side length and offset corresponding to the target transmitting coil can be deduced.

[0114] In some embodiments, the side length and offset of the target transmitting coil satisfy the following expression:

[0115] (13)

[0116] (14)

[0117] (15)

[0118] (16)

[0119] in, A , B These are the length and width of the target transmitting coil, respectively. a ,b These are the length and width of the receiving coil, respectively. This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. The inductance of the target transmitting coil, For the inductance of the receiving coil, The resonant capacitance of the target transmitting coil. The resonant capacitance of the receiving coil. The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil. This is the equivalent load resistance. For the transmission efficiency between the target transmitting coil and the receiving coil, It is the resonant angular frequency.

[0120] Combining the above formulas (13) to (16), it can be seen that the side length and offset of the target transmitting coil can be accurately obtained by measuring (or calculating) the corresponding parameters. The side length and offset of the target transmitting coil obtained by this method can be dynamically adjusted when the side length and position of the receiving coil change, so that the wireless charging system can always meet the requirements of transmission efficiency, thereby ensuring the charging efficiency of the entire charging system.

[0121] Example 3

[0122] Based on the above embodiments, this embodiment provides an application example.

[0123] This embodiment uses a two-coil parallel structure at the transmitting coil, equating the transmitting and receiving coils to a large coil and two small coils with overlapping portions. The mutual inductance values ​​M1, M2 and M12, M21 are calculated separately. For each mutual inductance value, a coefficient is added to the area of ​​the transmitting coil at the junction and the mutual inductance. Through theoretical derivation, a fitting analytical expression for the mutual inductance and the area of ​​the overlapping portion is obtained. Using this analytical expression, the design of the stacked coil with the required power is completed. The specific steps are as follows:

[0124] 1. Calculate the coupling coefficients between the two transmitting coils and the receiving coil, compare them, and obtain the larger value to determine the working coil.

[0125] The coupling coefficient between the receiving coil and the two transmitting coils is calculated using the self-inductance and mutual inductance of the transmitting and receiving coils. The transmitting coil with the larger coupling coefficient is then selected to carry the current, thereby achieving energy transfer. The formula for calculating the coupling coefficient is given in expression (1) above.

[0126] The mutual inductance value is related to the size of the transmitting coil and the receiving coil. For specific formulas, please refer to expressions (3) to (5) above.

[0127] The efficiency calculation formula is given in expression (2) above.

[0128] Since the wireless charging system consists of two primary sides and one secondary side, only one primary side is working during operation. Therefore, the efficiency is the power of the secondary side divided by the power of primary side 1 or primary side 2, denoted by i.

[0129] It should be noted that the efficiency of a wireless charging system is related to many factors (such as circuit topology design, control strategy, device model and characteristics, soft switching, etc.), but this technical solution analyzes the impact of the coupling coil on efficiency and then designs the coil accordingly. Therefore, from the perspective of controlled variables, only the efficiency of the coupling coil itself is considered in the calculation of this efficiency formula.

[0130] Combination Figure 2 The corresponding equivalent circuit diagram is defined. , , The total impedances of the two transmitting circuits and one receiving circuit are respectively. For specific formulas, please refer to expressions (6) to (8) above.

[0131] According to Kirchhoff's voltage theorem, by analyzing the two transmitting coil circuits and one receiving coil circuit, we can obtain matrix (9). The current of each circuit can be calculated based on matrix (9), see expressions (10) to (12) above.

[0132] 2. Determine the size and position of the transmitting coil based on the position of the receiving coil.

[0133] In this system, only one of the two transmitting coils is in working state. Substituting equations (9) to (11) into equation (2), in order to achieve the highest system efficiency and coupling coefficient within the expected offset range, the size and position-related quantities of the transmitting coil are derived, and the expressions corresponding to the side length and offset of the target transmitting coil can be obtained. See the expressions (13) to (16) above.

[0134] 3. Using the obtained analytical formulas for the parameters, calculate the length, width, and relative placement of the transmitting coil to complete the coil design.

[0135] Based on the required power, the positions and dimensions of the two parallel transmitting coils were designed using the obtained mutual inductance analytical formula. Through reasonable optimization of the two sets of transmitting coils, the overall coupling coefficient (average value) was maximized within the expected offset range.

[0136] Example 4

[0137] The transmitting coil positioning device according to an embodiment of this application will now be described with reference to the accompanying drawings. For the sake of brevity, appropriate omissions will be made in the following description of the device; relevant content can be referred to in the relevant description of the method above, and will not be repeated.

[0138] Figure 4 This is a schematic diagram of the structure of a positioning device with multiple transmitting coils in an inductive wireless charging system provided in this embodiment of the present disclosure.

[0139] like Figure 4 As shown, the inductive wireless charging system includes a receiving coil, and the positioning device 1000 includes the following units.

[0140] The calculation unit 1001 is used to calculate the coupling coefficient between the multiple transmitting coils and the receiving coil based on the self-inductance of the multiple transmitting coils, the self-inductance of the receiving coil, and the mutual inductance between the multiple transmitting coils and the receiving coil.

[0141] The determining unit 1002 is used to determine the target transmitting coil from the multiple transmitting coils based on the coupling coefficients between the multiple transmitting coils and the receiving coils respectively, wherein the coupling coefficient between the target transmitting coil and the receiving coil is greater than the coupling coefficient between the non-target transmitting coil and the receiving coil;

[0142] The calculation unit 1001 is also used to determine the transmission efficiency between the target transmitting coil and the receiving coil;

[0143] The calculation unit 1001 is also used to calculate the side length and offset of the target transmitting coil according to the transmission efficiency when the transmission efficiency meets the preset efficiency condition. The side length and offset of the target transmitting coil are related to the mutual inductance between the target transmitting coil and the receiving coil. The offset is used to represent the positional offset of the target transmitting coil relative to the receiving coil.

[0144] In some embodiments, the side length and offset of the target transmitting coil and the mutual inductance between the target transmitting coil and the receiving coil satisfy the following expression:

[0145] ;

[0146] ;

[0147] ;

[0148] in, M This represents the mutual inductance between the target transmitting coil and the receiving coil; x 1 represents the horizontal coordinate of the center point of the target's transmitting coil. x 2 represents the horizontal coordinates of the center point of the receiving coil; This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. , These are the number of turns of the target transmitting coil and the receiving coil, respectively. It represents the vacuum permeability.

[0149] In some embodiments, the transmission efficiency between the target transmitting coil and the receiving coil satisfies the following expression:

[0150]

[0151] in, I The loop current of the target transmitting coil. For the loop current of the receiving coil, The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil.

[0152] As an example, and not a limitation, when the number of transmitting coils is two, the above formula can be rewritten in the following form:

[0153] ;

[0154] in, This is the loop current of the first transmitting coil. This is the loop current of the second transmitting coil. For the loop current of the receiving coil, Let be the equivalent resistance of the first transmitting coil. This is the equivalent resistance of the second transmitting coil. This is the equivalent resistance of the receiving coil.

[0155] This can also be understood as follows: when i is 1, the first transmitting coil is the target transmitting coil; when i is 2, the second transmitting coil is the target transmitting coil.

[0156] In some embodiments, the calculation unit 1002 is further configured to: calculate the total impedance corresponding to the transmitting circuit of the plurality of transmitting coils and the receiving circuit of the receiving coil; calculate a target matrix based on the total impedance corresponding to the plurality of transmitting coils and the receiving coil according to Kirchhoff's voltage theorem; the target matrix is ​​used to represent the relationship between the total impedance corresponding to the plurality of transmitting coils and the receiving coil, the input voltage of the plurality of transmitting coils, the loop current of the plurality of transmitting coils, and the loop current of the receiving coil; and solve the target matrix to obtain the loop current expressions of the plurality of transmitting coils and the loop current expressions of the receiving coil.

[0157] In some embodiments, the calculation unit 1002 is further configured to calculate the side length and offset corresponding to the target transmitting coil based on the transmission efficiency, including: determining the loop current expression of the target transmitting coil from the loop current expressions of multiple transmitting coils, wherein the loop current expression of the target transmitting coil is related to the mutual inductance between the target transmitting coil and the receiving coil; inputting the loop current expression of the target transmitting coil and the loop current expression of the receiving coil into the transmission efficiency expression for calculation to obtain the side length and offset corresponding to the target transmitting coil.

[0158] In some embodiments, the side length and offset of the target transmitting coil satisfy the following expression:

[0159] ;

[0160] ;

[0161] ;

[0162] ;

[0163] in, A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. The inductance of the target transmitting coil, For the inductance of the receiving coil, The resonant capacitance of the target transmitting coil. The resonant capacitance of the receiving coil. The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil. This is the equivalent load resistance. For the transmission efficiency between the target transmitting coil and the receiving coil, It is the resonant angular frequency.

[0164] In one implementation, the device 1000 further includes a storage unit 1003, which can be used to store instructions and / or data, thereby implementing the method in the above embodiments.

[0165] It should be noted that the information interaction and execution process between the above-mentioned units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, which will not be repeated here.

[0166] Example 5

[0167] Figure 5 This is a schematic diagram of the structure of a computer device provided in an embodiment of this disclosure.

[0168] Based on the above embodiments, this embodiment provides a computer device 3000, including a memory 3200, a processor 3100, and a computer program 3210 stored in the memory. The processor 3100 executes the computer program 3210 to implement the steps of the method described in the above embodiments.

[0169] In some embodiments of this example, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0170] In some embodiments of this example, a computer program product is provided, including a computer program / instructions, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0171] The processor 3100 may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), a controller, a microcontroller, a microprocessor, or other electronic components, for executing the methods described in the above embodiments.

[0172] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media may include, but are not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, and computer storage media (e.g., hard disks, floppy disks, solid-state drives, removable disks, CD-ROMs, DVD-ROMs, Blu-ray discs, etc.).

[0173] Computer-readable storage media may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device executes the computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed.

[0174] In addition, the computer device 3000 may also include (but is not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (e.g., keyboard, mouse, speakers, etc.).

[0175] The processor 3100 can communicate with external devices via wired or wireless networks through the I / O bus.

[0176] In one embodiment, the at least one computer-executable instruction may also be compiled into or comprise a software product / computer program product, wherein one or more computer-executable instructions are executed by a processor to perform the steps of the various functions and / or methods in the embodiments described herein.

[0177] In the embodiments provided in this disclosure, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0178] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0179] While the embodiments disclosed herein are as described above, the foregoing content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope of this disclosure; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A positioning method for multiple transmitting coils in an inductive wireless charging system, characterized in that, The inductive wireless charging system includes a receiving coil, and the positioning method includes: Based on the self-inductance of the multiple transmitting coils, the self-inductance of the receiving coil, and the mutual inductance between each of the multiple transmitting coils and the receiving coil, calculate the coupling coefficient between each of the multiple transmitting coils and the receiving coil; Based on the coupling coefficients between the plurality of transmitting coils and the receiving coil, a target transmitting coil is determined from the plurality of transmitting coils, wherein the coupling coefficient between the target transmitting coil and the receiving coil is greater than the coupling coefficients between the other transmitting coils and the receiving coil; Determine the transmission efficiency between the target transmitting coil and the receiving coil; wherein the transmission efficiency between the target transmitting coil and the receiving coil satisfies the following expression: ； in, I The loop current of the target transmitting coil. For the loop current of the receiving coil, The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil; When the transmission efficiency meets the preset efficiency condition, the side length and offset of the target transmitting coil are calculated based on the transmission efficiency. The side length and offset of the target transmitting coil are related to the mutual inductance between the target transmitting coil and the receiving coil. The offset is used to represent the positional offset of the target transmitting coil relative to the receiving coil. The method further includes: Calculate the total impedance of the transmitting circuit of the plurality of transmitting coils and the receiving circuit of the receiving coil; According to Kirchhoff's voltage theorem, a target matrix is ​​calculated based on the total impedance of each of the plurality of transmitting coils and the receiving coil. The target matrix is ​​used to represent the relationship between the total impedance of each of the plurality of transmitting coils and the receiving coil, the input voltage of the transmitting coil, the loop current of the plurality of transmitting coils, and the loop current of the receiving coil. Solve the target matrix to obtain the loop current expressions for the plurality of transmitting coils and the loop current expression for the receiving coil.

2. The method according to claim 1, characterized in that, The side length and offset of the target transmitting coil, and the mutual inductance between the target transmitting coil and the receiving coil, satisfy the following expression: ； ； ； in, M This represents the mutual inductance between the target transmitting coil and the receiving coil; x 1 represents the horizontal coordinate of the center point of the target's transmitting coil. x 2 represents the horizontal coordinates of the center point of the receiving coil; This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. , These are the number of turns of the target transmitting coil and the receiving coil, respectively. It represents the vacuum permeability.

3. The method according to claim 1, characterized in that, The step of calculating the side length and offset of the target transmitting coil based on the transmission efficiency includes: The loop current expression of the target transmitting coil is determined from the loop current expressions of the plurality of transmitting coils, and the loop current expression of the target transmitting coil is related to the mutual inductance between the target transmitting coil and the receiving coil; The loop current expression of the target transmitting coil and the loop current expression of the receiving coil are input into the transmission efficiency expression for calculation to obtain the side length and offset corresponding to the target transmitting coil.

4. The method according to claim 3, characterized in that, The side length and offset of the target transmitting coil satisfy the following expression: ； ； ； ； in, A , B These are the length and width of the target transmitting coil, respectively. a , b These are the length and width of the receiving coil, respectively. This indicates the horizontal positional offset between the target's transmitting and receiving coils. This indicates the vertical positional offset between the target's transmitting and receiving coils. The inductance of the target transmitting coil, For the inductance of the receiving coil, The resonant capacitance of the target transmitting coil. The resonant capacitance of the receiving coil, The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil. This is the equivalent load resistance. For the transmission efficiency between the target transmitting coil and the receiving coil, It is the resonant angular frequency.

5. A positioning device for multiple transmitting coils in an inductive wireless charging system, characterized in that, The inductive wireless charging system includes a receiving coil, and the positioning device includes: The calculation unit is used to calculate the coupling coefficient between the multiple transmitting coils and the receiving coil based on the self-inductance of the multiple transmitting coils, the self-inductance of the receiving coil, and the mutual inductance between the multiple transmitting coils and the receiving coil. A determining unit is configured to determine a target transmitting coil from among the plurality of transmitting coils based on the coupling coefficients between the plurality of transmitting coils and the receiving coil, wherein the coupling coefficient between the target transmitting coil and the receiving coil is greater than the coupling coefficients between other transmitting coils and the receiving coil; The calculation unit is further configured to determine the transmission efficiency between the target transmitting coil and the receiving coil; wherein the transmission efficiency between the target transmitting coil and the receiving coil satisfies the following expression: ； in, I The loop current of the target transmitting coil. For the loop current of the receiving coil, The equivalent resistance of the target transmitting coil. This is the equivalent resistance of the receiving coil; The calculation unit is further configured to, under the condition that the transmission efficiency meets the preset efficiency condition, calculate the side length and offset corresponding to the target transmitting coil according to the transmission efficiency, wherein the side length and offset corresponding to the target transmitting coil are related to the mutual inductance between the target transmitting coil and the receiving coil, and the offset is used to represent the positional offset of the target transmitting coil relative to the receiving coil; The calculation unit is further configured to: calculate the total impedance corresponding to the transmitting circuit of the plurality of transmitting coils and the receiving circuit of the receiving coil; calculate a target matrix based on Kirchhoff's voltage theorem and the total impedance corresponding to the plurality of transmitting coils and the receiving coil, the target matrix representing the relationship between the total impedance corresponding to the plurality of transmitting coils and the receiving coil, the input voltage of the transmitting coil, the loop current of the plurality of transmitting coils, and the loop current of the receiving coil; and solve the target matrix to obtain the loop current expressions of the plurality of transmitting coils and the loop current expressions of the receiving coil.

6. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 4.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 4.

8. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 4.

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