Wireless charging coil design method, wireless charging device, and system

Abstract

Provided in the embodiments of the present application are a wireless charging coil design method and a corresponding wireless charging device, which fully take into account the maximum allowable offset range between a transmitting end and a receiving end and the loss for each coil size, so as to output a coil size that exhibits better overall performance. The method comprises: on the basis of the allowable offset range, determining the relative position relationship between a transmitting coil and a receiving coil, wherein the allowable offset range is an offset range of a relative position when energy is transferred between the transmitting coil and the receiving coil; then, on the basis of the relative position relationship, acquiring receiving side losses corresponding to a plurality of coil sizes of the transmitting coil, the plurality of coil sizes being coil configuration solutions for the transmitting coil; then, on the basis of the receiving side losses corresponding to the plurality of coil sizes, determining a first coil size from the plurality of coil sizes; and if the first coil size meets a preset condition, using the first coil size as the configuration solution of the transmitting coil.

Description

A wireless charging coil design method, a wireless charging device, and a system.

[0001] This application claims priority to Chinese Patent Application No. 202510123689.5, filed on January 24, 2025, entitled "A Wireless Charging Coil Design Method, Wireless Charging Device and System", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of terminals, and more particularly to a wireless charging coil design method, wireless charging device, and system. Background Technology

[0003] With the widespread use of electronic devices, wireless charging is becoming increasingly common to facilitate user charging. Wireless charging utilizes transmitting and receiving coils to transfer energy through a magnetic field. During this energy transfer process, additional losses are introduced by the coils, and since the heat dissipation capacity of electronic devices is typically limited, wireless charging speeds can be relatively slow. To improve charging speed, high-power fast charging docks usually incorporate active cooling. However, their heat dissipation capacity remains limited, and charging speeds are still slower than wired charging.

[0004] For example, since the energy E transferred between the transmitting and receiving coils is proportional to the product of the ampere-turns (A*number of turns) of the current in both coils, existing wireless fast charging solutions reduce the ampere-turns (A*number of turns) in the receiving coil to decrease its losses, while correspondingly increasing the ampere-turns in the transmitting coil to maintain consistent power transmission. Simultaneously, methods such as mechanical limiting, active alignment, and magnetic alignment are used to improve the coil's coupling coefficient and thus enhance its power transmission efficiency. However, as wireless charging power increases, eddy current losses generated by the transmitting coil in the charged electronic device also increase. This eddy current loss is particularly significant for high-power wireless charging, limiting the improvement of wireless charging speed.

[0005] Therefore, reducing eddy current losses in the transmitting coil on electronic devices is a key issue in improving wireless charging speed. Summary of the Invention

[0006] This application provides a wireless charging coil design method and a corresponding wireless charging device, which fully considers the maximum possible offset range between the transmitter and receiver and the loss under each coil size, and outputs a coil size with better performance in all aspects.

[0007] In view of this, in a first aspect, this application provides a wireless charging coil design method, comprising: determining the relative positional relationship between a transmitting coil and a receiving coil based on a misalignment range, wherein the misalignment range is the offset range of the relative positions of the transmitting coil and the receiving coil when transferring energy, such as the range of misalignment between the coil of the wireless charging device and the coil of the device being charged is generally allowed to exist within a certain range, which is the misalignment range; subsequently obtaining the receiving-side loss of multiple coil sizes of the transmitting coil based on the relative positional relationship, wherein the multiple coil sizes are coil configuration schemes in the transmitting coil, which can be used to represent the specific size of the coil, and the receiving-side loss may include the loss generated by the receiving coil and the loss generated on the receiving coil or other components due to the excitation of the transmitting coil; subsequently determining a first coil size from the multiple coil sizes based on the receiving-side loss corresponding to the multiple coil sizes, such as selecting one or more coil sizes with lower loss; if the first coil size meets a preset condition, then the first coil size is used as the configuration scheme of the transmitting coil.

[0008] In this embodiment, the offset position between the transmitting coil and the receiving coil is considered to design a transmitting coil configuration scheme with lower receiving coil loss. This can reduce losses on the receiving side, such as eddy current losses or other losses, and reduce heat generation on the receiving side, thereby improving the charging speed on the receiving side.

[0009] In one possible implementation, the aforementioned determination of the relative positional relationship between the transmitting coil and the receiving coil based on the possible offset range between the transmitting coil and the receiving coil may include: determining the relative positional relationship between the transmitting coil and the receiving coil based on the maximum possible offset range between the transmitting coil and the receiving coil.

[0010] In this embodiment, the relative positional relationship between the transmitting coil and the receiving coil can be determined according to the maximum possible offset range between the transmitting coil and the receiving coil, thereby taking into account the possible offset relationship between the transmitting coil and the receiving coil to the greatest extent, so that the designed transmitting coil can wirelessly charge the receiving side at each position to the greatest extent.

[0011] In one possible implementation, the aforementioned method of obtaining the receiver-side loss corresponding to the various coil sizes of the transmitting coil based on the relative positional relationship may include: traversing the coil configuration schemes of the transmitting coil to obtain various coil sizes; and then simulating the transmitting coil according to the various coil sizes based on the relative positional relationship to obtain the receiver-side loss corresponding to the energy transferred from the transmitting coil to the receiving coil.

[0012] In this embodiment, multiple coil sizes can be obtained by traversal, and simulation analysis, such as finite element analysis, can be performed based on these multiple coil sizes. This analysis can then be used to obtain the receiving-side loss corresponding to each coil size, so that a transmitting coil size with lower loss can be selected based on the receiving-side loss.

[0013] In one possible implementation, the aforementioned method further includes: determining the size range of the transmitting coil based on preset coil information, the size range including the cross-sectional dimensions and the overall dimensions of the transmitting coil, wherein the cross-sectional dimensions include at least the cross-sectional width and thickness, and may also include the cross-sectional area, etc. When the transmitting coil is rectangular, the overall dimensions include the lengths of each side; when the transmitting coil is circular, the overall dimensions include the diameter. The aforementioned traversal of the transmitting coil configuration scheme to obtain multiple coil sizes may include: traversing the transmitting coil configuration scheme with the cross-sectional dimensions as constraints under the constraint of the overall dimensions range to obtain multiple coil sizes, wherein one coil size includes at least one of the following: side length, inner diameter, outer diameter, inner width, outer width, and thickness. In this application embodiment, the allowed size range of the transmitting coil can be determined based on preset coil information, such as the size range of the transmitting coil limited by the actual product form of the wireless charging device. By traversing various coil sizes within the allowed coil size range, a transmitting coil size adapted to the actual product form can be obtained.

[0014] In one possible implementation, the aforementioned method further includes: if the size of the first coil does not meet the preset conditions, adjusting the size range of the transmitting coil, and obtaining a new first coil size based on the adjusted size range.

[0015] In this embodiment of the application, the size of the transmitting coil is adjusted when the transmitting coil does not meet the conditions, thereby obtaining a transmitting coil size that meets the conditions.

[0016] In one possible implementation, the aforementioned adjustment of the transmitting coil size range may include: increasing the cross-sectional size of the transmitting coil and increasing the minimum coil outline size of the transmitting coil.

[0017] In this embodiment of the application, the coil size of the transmitting coil can be adjusted by increasing the cross-sectional size of the transmitting coil or by increasing the minimum coil outline size of the transmitting coil, so as to obtain a transmitting coil size that meets the conditions.

[0018] In one possible implementation, the aforementioned preset condition includes whether the transmit coil loss corresponding to the first coil size is less than a first threshold. In this application embodiment, when determining the coil size of the transmit coil, the magnitude of the transmit coil loss is also considered, so that the obtained transmit coil size meets the desired loss.

[0019] In one possible implementation, the aforementioned method further includes: reducing the size range of the transmitting coil when the transmitting coil loss corresponding to the first coil size is less than a first threshold, and obtaining a new first coil size based on the reduced size range. This size range may include, but is not limited to, the cross-sectional size or overall shape of the transmitting coil. In this embodiment, when the loss corresponding to the first coil size is within a desired range, the size range of the transmitting coil can be further reduced to obtain a smaller transmitting coil, thereby achieving a lighter transmitting coil.

[0020] In one possible implementation, the aforementioned determination of the first coil size from multiple coil sizes based on the receiving-side loss corresponding to multiple coil sizes may include: determining the first N coil sizes from the multiple coil sizes as the first coil size in ascending order of receiving-side loss, where N is a positive integer. In this embodiment, when selecting the first coil size from multiple coil sizes, the coil size with the smaller receiving-side loss can be determined as the first coil size in ascending order of receiving-side loss, thereby obtaining the transmitting coil size with the smaller receiving-side loss.

[0021] In one possible implementation, the aforementioned transmitting coil is at least two layers of coils, such as a double-layer coil or more layers of coils. This makes the magnetic field excited by the transmitting coil more concentrated and reduces coupling with eddy current loops on the external metal components of the coil.

[0022] Secondly, this application provides a wireless charging device, comprising:

[0023] The first transmitting coil is used to transfer energy to the outside through a magnetic field;

[0024] The controller is used to control the first transmitting coil to transfer energy to the outside through the magnetic field.

[0025] In this embodiment of the application, a wireless charging device is also provided, which can achieve faster wireless charging with lower receiver-side loss.

[0026] In one possible implementation, the aforementioned first transmitting coil includes a transmitting coil obtained through the method steps of the aforementioned first aspect or any optional implementation of the first aspect, thereby taking into account the offset range between the transmitting coil and the receiving coil, obtaining a transmitting coil size with lower receiving-side loss, reducing eddy current loss on the receiving side, and improving the charging speed on the receiving side.

[0027] In one possible implementation, the aforementioned first transmitting coil is at least a two-layer coil. Therefore, in this embodiment of the application, the transmitting coil can be configured with two or more layers, thereby making the magnetic field excited by the transmitting coil more concentrated and reducing the coupling with the eddy current loop on the external metal component of the coil.

[0028] In one possible implementation, the aforementioned first transmitting coil is rectangular or circular in shape, so that the appropriate transmitting coil shape can be selected according to different product forms.

[0029] In one possible implementation, the side length or diameter of the aforementioned first transmitting coil is in the range of 33 mm to 48 mm.

[0030] In one possible implementation, the side length or diameter of the aforementioned first transmitting coil is in the range of 35 mm to 46 mm.

[0031] In one possible implementation, the side length or diameter of the aforementioned first transmitting coil is in the range of 35.5mm-36.5mm.

[0032] In one possible implementation, the side length or diameter of the aforementioned first transmitting coil is in the range of 40.5mm-41.5mm.

[0033] In one possible implementation, the cross-sectional thickness of the aforementioned first transmitting coil is in the range of 1.8 mm to 2.4 mm.

[0034] In one possible implementation, the aforementioned wireless charging device further includes a second transmitting coil, which comprises a transmitting coil obtained by the method described in the first aspect or any of the first aspects.

[0035] In one possible implementation, the distance between the aforementioned first transmitting coil and the second transmitting coil is in the range of 36mm-38mm.

[0036] Thirdly, this application provides a wireless charging system, including: a wireless charging device and a terminal; the wireless charging device includes the wireless charging device as described in the second aspect or any optional embodiment of the second aspect; the terminal is used to replenish energy through the energy transferred by the wireless charging device.

[0037] Fourthly, embodiments of this application provide a wireless charging coil design device, the device comprising:

[0038] The position determination module is used to determine the relative positional relationship between the transmitting coil and the receiving coil based on the offset range, which is the offset range of the relative positions of the transmitting coil and the receiving coil when transferring energy.

[0039] The loss determination module is used to obtain the receiver-side loss of various coil sizes of the transmitting coil based on the relative positional relationship. The various coil sizes are the coil setting scheme in the transmitting coil.

[0040] A filtering module is used to determine the first coil size from multiple coil sizes based on the receiver loss corresponding to multiple coil sizes;

[0041] The output module is used to set the size of the first coil as the setting scheme for the transmitting coil if the size of the first coil meets the preset conditions.

[0042] In one possible implementation, the position determination module is specifically used to determine the relative positional relationship between the transmitting coil and the receiving coil based on the maximum possible offset range between the transmitting coil and the receiving coil.

[0043] In one possible implementation, the loss determination module is specifically used to traverse the coil configuration schemes of the transmitting coil to obtain multiple coil sizes; and to simulate the transmitting coil according to the multiple coil sizes based on the relative positional relationship to obtain the receiving-side loss corresponding to the energy transferred from the transmitting coil to the receiving coil.

[0044] In one possible implementation, the loss determination module is specifically used for:

[0045] The size range of the transmitting coil is determined based on the preset coil information. The size range includes the cross-sectional size of the transmitting coil and the coil outline size range. First, the coil cross-sectional size is set, and then the coil setting scheme of the transmitting coil is traversed under the constraint of the coil outline size range to obtain multiple coil sizes. One of the coil sizes includes at least one of the following: coil side length, inner diameter, outer diameter, inner width, outer width, and thickness.

[0046] In one possible implementation, the output module is further configured to adjust the size range of the transmitting coil if the size of the first coil does not meet the preset conditions, and obtain a new size of the first coil based on the adjusted size range.

[0047] In one possible implementation, the output module is specifically used to increase the cross-sectional size of the transmitting coil, or to increase the minimum coil outline size of the transmitting coil.

[0048] In one possible implementation, the preset conditions include whether the transmit coil loss corresponding to the first coil size is less than a first threshold.

[0049] In one possible implementation, the output module is further configured to reduce the size range of the transmitting coil when the transmitting coil loss corresponding to the first coil size is less than a first threshold, and obtain a new first coil size based on the reduced size range.

[0050] In one possible implementation, the screening module is used to determine the first N coil sizes from a variety of coil sizes as the first coil size, in ascending order of receiving-side loss, where N is a positive integer.

[0051] In one possible implementation, the transmitting coil is a coil with at least two layers. Attached Figure Description

[0052] Figure 1 is a schematic diagram of the architecture of a wireless charging system provided in an embodiment of this application;

[0053] Figure 2 is a structural schematic diagram of a wireless charging device provided in an embodiment of this application;

[0054] Figure 3 is a schematic diagram of another wireless charging device provided in an embodiment of this application;

[0055] Figure 4 is a flowchart illustrating a wireless charging coil design method provided in an embodiment of this application;

[0056] Figure 5 is a flowchart illustrating another wireless charging coil design method provided in an embodiment of this application;

[0057] Figure 6 is a schematic diagram of another wireless charging device provided in an embodiment of this application;

[0058] Figure 7 is a schematic diagram of the charging efficiency of a wireless charging coil provided in an embodiment of this application;

[0059] Figure 8 is a schematic diagram of the structure of a wireless charging coil provided in an embodiment of this application;

[0060] Figure 9 is a schematic diagram of another wireless charging coil provided in an embodiment of this application;

[0061] Figure 10 is a structural schematic diagram of a wireless charging coil design device provided in an embodiment of this application;

[0062] Figure 11 is a schematic diagram of the structure of a computing device provided in an embodiment of this application. Detailed Implementation

[0063] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0064] The scenarios provided in this application can be applied to wireless charging scenarios. For example, scenarios where a wireless charging device is used to charge an electronic device, or scenarios where an electronic device performs reverse charging, etc.

[0065] Wireless charging devices include devices that contain transmitting coils, and their specific configurations can include flat, fixed bracket, folding bracket, or other forms of devices that can be used for wireless charging.

[0066] Electronic devices may include devices containing receiving coils, including but not limited to one or more of the following: mobile phones, tablets, wearable devices, in-vehicle devices, augmented reality (AR) / virtual reality (VR) devices, laptops, netbooks, personal digital assistants (PDAs), and other terminal devices.

[0067] In some scenarios, a transmitting coil and a receiving coil can be set up in the same electronic device. Energy can be emitted outward through the transmitting coil and received through the receiving coil to operate the device or charge the battery.

[0068] For example, the architecture of a wireless charging system provided in this application can be as shown in Figure 1, which may include a wireless charging device 02 and an electronic device 01, or the electronic device may also be referred to as a terminal.

[0069] The wireless charging device includes a transmitter 30 and an adapter 40. The adapter can be used to provide power to the transmitter. The transmitter contains one or more transmit (Tx) coils for radiating energy to the outside through electromagnetic induction.

[0070] The electronic device includes a receiver 20 and a battery 50. The receiver 20 contains a receiver (Rx) coil, which is used to receive energy through electromagnetic induction and convert the received energy into electrical energy and store it in the battery.

[0071] In other words, energy is transferred between the transmitting coil in the wireless charging device and the receiving coil in the electronic device through electromagnetic induction, thereby enabling the electronic device to be charged without being connected to a wired charger.

[0072] Figure 1 shows an electronic device 01 placed horizontally on the surface of a wireless charging device. In some scenarios, the wireless charging device 02 can also be a device with a certain tilt angle, that is, the electronic device 01 can also be placed on the surface of the wireless charging device at a certain tilt angle.

[0073] The transmitting device 30 transmits power to the receiving device 20; control signals or charging data can be transmitted between the transmitting device 30 and the receiving device 20. The transmission of control signals or charging data can be achieved through in-band communication or out-of-band communication. Wireless connection can be established between the transmitting device 30 and the receiving device 20 via out-of-band communication methods such as Bluetooth, Wireless-Fidelity (WiFi), Zigbee, Radio Frequency Identification (RFID), Longrange (Lora) wireless technology, or Near Field Communication (NFC) technology, enabling wireless communication between them.

[0074] This charging data can be used to indicate the charging type. In some embodiments, the charging data can be a charging protocol, such as the Qi wireless charging standard launched by the Wireless Power Consortium (WPC), such as the Basic Power Profile (BPP) protocol, or the Extended Power Profile (EPP) protocol, etc.

[0075] Furthermore, as shown in Figure 2, a wireless charging device may have multiple transmitting coils, including two transmitting coils 21 and 22. For example, taking a mobile phone as an example, the relative position between the receiving coil and the wireless charging device may differ depending on how the phone is positioned. For instance, the phone can be placed horizontally or vertically relative to the wireless charging device, or at other angles; here, we'll use two placement methods as examples. The relative positions between the receiving and transmitting coils differ depending on whether the phone is placed horizontally or vertically. If only one transmitting coil is used, wireless charging may fail when the phone's position changes, or the charging speed may decrease. Therefore, in some possible scenarios, multiple transmitting coils can be used to accommodate different placement configurations of electronic devices and improve charging speed.

[0076] During the wireless charging process, energy is transferred between the transmitting and receiving coils, which may experience losses. Electronic devices typically have limited heat dissipation capabilities, resulting in slower wireless charging speeds. To improve charging speed, active cooling modules are often incorporated into high-power fast charging docks. However, the cooling capacity of these active modules is limited, and due to these limitations, wireless charging remains slower than wired charging.

[0077] Generally, the energy transferred between the transmitting and receiving coils is proportional to the product of the ampere-turns of the current in both coils. To reduce heat generation in the phone's coils, some existing solutions reduce the ampere-turns of the current in the receiving coil to decrease losses, while correspondingly increasing the ampere-turns of the current in the transmitting coil to maintain consistent transmission power. However, with constant transmission power, reducing the ampere-turns of the current in the receiving coil increases the ampere-turns of the current in the transmitting coil, which in turn increases eddy current losses in the phone. For example, high-power wireless charging pads typically use the existing Qi standard 15W transmitting coil, increasing the transmitting coil current to achieve high-power (e.g., 50W, 80W) transmission. During high-power charging, the transmitting coil generates considerable eddy current losses in the phone.

[0078] Therefore, this application provides a wireless charging coil design method and a corresponding wireless charging device, which fully considers the maximum possible offset range between the transmitter and receiver and the loss under various sizes, and outputs a coil size with better performance in all aspects.

[0079] The following section describes the wireless charging coil design method and corresponding wireless charging device provided in the embodiments of this application.

[0080] To facilitate understanding, the structure of the wireless charging device provided in this application embodiment will be briefly introduced first. The structure of the wireless charging device provided in this application embodiment can be as shown in Figure 3. The wireless charging device may include:

[0081] The transmitting coil 301 is used to transfer energy to the outside through a magnetic field. For ease of distinction, this transmitting coil can also be referred to as the first transmitting coil.

[0082] The controller 302 is used to control the first transmitting coil to transfer energy to the outside through the magnetic field.

[0083] In addition, wireless charging devices may include more components, such as conversion circuits and inverter circuits. This application does not limit this. The following is a description of the transmitting coil.

[0084] Among them, the coil size of the transmitting coil in the wireless charging device will affect the overall charging speed and charging loss of the wireless charging device. Regarding the coil setting method of the transmitting coil, this application provides a wireless charging coil design method, which can determine the coil setting method with fast charging speed and low loss by combining the possible offset range between the transmitting coil and the receiving coil and the receiving side loss corresponding to different coil shapes.

[0085] Referring to Figure 4, a flowchart illustrating a wireless charging coil design method provided in an embodiment of this application is shown below.

[0086] 401. Determine the relative positional relationship between the transmitting coil and the receiving coil based on the allowable offset range.

[0087] The allowable offset range refers to the range of relative positional offset between the transmitting and receiving coils during energy transfer. Typically, during energy transfer between the transmitting and receiving coils, they are not perfectly aligned; that is, there is a certain range of offset between them, which is the offset range.

[0088] Based on this offset range, the possible relative positional relationship between the transmitting coil and the receiving coil can be determined. That is, under the constraint of satisfying this offset range, the possible relative positional relationship between the transmitting coil and the receiving coil can be determined. For example, after deploying the transmitting coil in a reserved position in a wireless charging device, the possible positional range of the receiving coil can be determined based on this offset range. This positional range can then be used to represent the possible relative positional relationship between the transmitting coil and the receiving coil.

[0089] Optionally, before determining the relative position, a physical model of the wireless charging device can be modeled, that is, a model of the wireless charger performing wireless charging can be constructed based on pre-given wire diameter, number of coil layers or number of coil turns, etc., including the relationship between wireless charging power, transmitting-side loss, receiving-side loss, size range of transmitting coil or winding scheme of transmitting coil, etc., so as to determine the final coil setting scheme based on the model.

[0090] For example, a finite element simulation analysis model for transmission and reception can be established to simulate the wireless charging system using mathematical approximations. Basic elements can be used to simulate the interacting components in the wireless charging system and the load conditions of each component.

[0091] 402. Obtain the receiver-side loss corresponding to various coil sizes of the transmitting coil based on their relative positional relationships.

[0092] First, based on the aforementioned relative positional relationships, various possible coil sizes for the transmitting coil are determined. These various coil sizes refer to the coil winding schemes within the transmitting coil, constrained by the size range of the transmitting coil, including but not limited to parameters used to represent the size of the transmitting coil such as side length, inner diameter, outer diameter, inner width, outer width, and thickness.

[0093] Typically, the size range of the transmitting coil can be set based on product information of the wireless charging device to be designed, such as wire diameter, number of coil layers, and number of coil turns. This size range can be divided into the cross-sectional dimensions of the transmitting coil and the overall coil dimensions. The cross-sectional dimensions can include the side length or thickness of the coil cross-section, as well as the cross-sectional area. The overall coil dimensions include the dimensions of each side length, diameter, or radius of the transmitting coil, specifically including but not limited to one or more of the following: side length, inner diameter, outer diameter, internal width, external width, and thickness. These dimensions can be used to determine the coil winding scheme. Multiple coil sizes that satisfy the specified cross-sectional dimensions can be iterated through within the constraints of the overall coil dimensions range.

[0094] The names of the dimensions may differ for different transmitting coil shapes. For example, the coil winding may form a rectangular ring structure with a hollow interior. The aforementioned internal width refers to the width of the inner ring, and the external width can refer to the width of the outer ring. The coil winding may form a circular ring structure with a hollow interior. The inner diameter can refer to the diameter of the inner ring, and the outer diameter can refer to the diameter of the outer ring.

[0095] Thickness and other parameters, one or more, can be used to indicate the winding scheme of a coil.

[0096] Once the various coil sizes are determined, the charging situation corresponding to each coil size can be simulated through simulation to determine the receiving-side loss under each configuration. For example, after constructing the model corresponding to the wireless charging device, the model can be simulated to calculate the receiving-side loss corresponding to each configuration. That is, the receiving-side loss of energy transferred from the transmitting coil to the receiving coil when the transmitting coil is set to each coil configuration. Specifically, this can include the loss on the receiving coil and the loss generated by the magnetic field excited by the transmitting coil on the receiving coil and its surrounding components, such as eddy current loss or hysteresis loss of magnetic components.

[0097] Typically, to facilitate comparison of losses for different coil sizes under various misalignment conditions of the transmitting and receiving coils, simulations can be performed for each coil size under the same misalignment condition to determine one or more receiving-side losses corresponding to each coil size, thus controlling for potential variables in subsequent comparisons.

[0098] Optionally, the transmitting coil can be configured as a single-layer coil or a double-layer coil. For example, to be compatible with the Qi standard, the transmitting coil can be configured as a double-layer coil or a coil with two or more layers, thus making it suitable for high-power fast-charging wireless charging devices.

[0099] 403. Determine the first coil size from among the various coil sizes based on the receiving-side loss corresponding to the various coil sizes.

[0100] After calculating the losses corresponding to various coil sizes, the first coil size can be selected from these various coil shapes.

[0101] For example, among the various coil sizes, the N coil sizes with the lowest receiving-side loss, arranged from lowest to highest, can be selected as the first coil size, where N is a positive integer. The specific value of N can be determined according to the actual application scenario. For instance, in some cases, to improve the convergence efficiency of the scheme and quickly output a set of coil sizes, N can be set to 1. For example, the first coil size can be obtained as the set of transmitting coil sizes corresponding to the minimum receiving-side loss under the same transmission power.

[0102] 404. If the size of the first coil meets the preset conditions, then the size of the first coil shall be used as the setting scheme for the transmitting coil.

[0103] After selecting the first coil size, it can be determined whether the first coil size meets the preset conditions. If so, the first coil size is used as the setting scheme for the transmitting coil.

[0104] Therefore, in the embodiments of this application, when designing the setting scheme of the transmitting coil, the misalignment between the transmitting coil and the receiving coil is considered. Based on the misalignment and the receiving-side losses corresponding to various coil sizes, including eddy current losses or other losses on the receiving coil side caused by the transmitting power of the transmitting coil, the transmitting coil setting scheme with the lowest possible receiving-side loss is selected, thereby reducing the heat generation on the receiving coil side and improving the charging speed of the electronic device.

[0105] In one possible implementation, if the size of the first coil does not meet the preset conditions, the size range of the transmitting coil is adjusted, and a new first coil size is obtained based on the adjusted size range, until a first coil size that meets the preset conditions is obtained, or the number of iterations reaches a preset number, etc. Therefore, in this embodiment, a transmitting coil setting scheme that meets the preset conditions can be determined iteratively, fully considering the misalignment between the transmitting and receiving coils and the possible receiving-side losses. A transmitting coil setting scheme with lower receiving-side losses can be selected based on different transmission power requirements, thereby reducing heat generation on the receiving side and improving the charging speed and efficiency of the wireless charging device.

[0106] Optionally, the preset condition includes whether the transmit-side loss corresponding to the first coil size is less than a first threshold. The transmit-side loss can be understood as the loss generated by the transmit coil when transmitting energy.

[0107] Optionally, the aforementioned adjustment of the transmitting coil size range may specifically include increasing the range of the transmitting coil's cross-sectional size and coil outline size, thereby obtaining a transmitting coil configuration with lower transmitting-side losses by increasing the size of the transmitting coil.

[0108] In one possible implementation, if the transmit-side loss corresponding to the first coil size is less than a first threshold, the size range of the transmit coil is reduced, such as by reducing the cross-sectional size or reducing the maximum coil outline size, and a new first coil size is obtained based on the reduced size range, so as to achieve a transmit coil that meets the requirements and is lighter.

[0109] The foregoing has described the method flow provided in the embodiments of this application. For ease of understanding, the method flow and structure of the wireless charging device provided in the embodiments of this application will be further described below in conjunction with specific application scenarios.

[0110] The method provided in this application can be applied to the transmitting coil of a wireless fast charging dock for mobile phones, designed to achieve higher wireless charging speeds. For example, for a high-power fast-charging mobile phone wireless charging dock, by limiting the maximum lateral displacement range and increasing the angle of magnetic field concentration of the transmitting coil, the maximum eddy current loss generated by the transmitting coil on the mobile phone, i.e., the receiving-side loss, can be reduced within the designed lateral displacement range, thereby improving the charging speed. Specifically, a multi-layer coil is used instead of a single-layer coil, making the magnetic field excited by the transmitting coil more concentrated and reducing the coupling with eddy current loops on the external metal components of the coil. The design goal is to minimize the receiving-side loss on the mobile phone (or maximize the charging speed of the mobile phone coil) under the same transmission power and the maximum designed lateral displacement. The optimal dimensions of the multi-layer transmitting coil are determined by finite element analysis (FEA) simulation (or vector network analyzer (VNA) measurement).

[0111] Of course, in addition to providing wireless charging for mobile phones, it can also be used in various wireless charging docks or transmitters for portable terminal devices such as tablets and laptops, such as desktop stand-type wireless charging docks, car stand-type wireless charging docks, car pre-installed wireless charging modules, power banks with wireless charging function, or various devices with embedded wireless charging modules.

[0112] For example, as shown in Figure 5, another flowchart of a wireless charging coil design method provided in this application embodiment is as follows.

[0113] 501. Establish finite element models of the transmitting coil and receiving coil.

[0114] First, a finite element model for transmission and reception is established using a finite element simulation model. This model is used to simulate the operation of the wireless charging device, so as to analyze the transmission coil loss and reception coil loss under different transmission coil settings.

[0115] 502. Set the maximum offset working position.

[0116] The maximum offset working position is the maximum allowable offset range between the transmitting coil and the receiving coil corresponding to the device. Different electronic devices may be placed on the wireless charging device in different ways, which may cause different offsets between the transmitting coil and the receiving coil. When the offset is too large, it may cause the energy between the transmitting coil and the receiving coil to be unable to be transferred, or the transfer efficiency to be too low.

[0117] Typically, the maximum offset working position between the transmitting coil and the receiving coil may vary depending on the product form or application scenario. The maximum offset working position between the transmitting coil and the receiving coil can be determined based on the form of the wireless charging product or the electronic device product, that is, the possible relative positional relationship between the transmitting coil and the receiving coil.

[0118] 503. Set the cross-sectional dimensions of the transmitting coil.

[0119] Typically, the coil, number of layers, or number of turns can be determined based on the form of the actual product to be deployed or the materials required. Once the form or material of the coil, number of layers, or number of turns is determined, the cross-sectional size or range of the transmitting coil can be determined based on the coil, number of layers, or number of turns.

[0120] In the initial stage, the initial cross-sectional size and coil outline size range of the transmitting coil can be set based on factors such as the coil type, number of layers, or number of turns. In subsequent iterations, the cross-sectional size or coil outline size range of the transmitting coil can be adjusted based on the results of the previous iteration.

[0121] 504. Within the range of coil dimensions (side length or radius), perform simulation analysis on transmitting coils with different coil dimensions to obtain the transmitting coil size with the minimum receiving-side loss.

[0122] After determining the cross-sectional dimensions of the transmitting coil, within the allowable coil outline dimensions, all possible transmitting coil sizes can be iterated according to the cross-sectional dimensions to obtain multiple transmitting coil size schemes. Each coil size includes both the cross-sectional and outline dimensions of the transmitting coil. Simultaneously, the receiver-side loss corresponding to each transmitting coil size is determined through simulation, and the transmitting coil size with lower receiver-side loss is selected.

[0123] The dimensions of the transmitting coil include its inner diameter, outer diameter, side length, internal width, external width, and thickness. The range of coil dimensions can include the range formed by the minimum and maximum coil dimensions. Furthermore, once the dimensions of the transmitting coil are determined, the number of layers and the number of turns per layer are also determined based on the information of the actual wire used.

[0124] Furthermore, iterating through the dimensions of all transmitting coils and calculating the corresponding receiver-side losses requires multiple rounds of simulation, which can result in a very large amount of computation.

[0125] Furthermore, to simplify the calculations in the simulation process, assuming there is no metal structure around the transmitting coil or the eddy current loss of the metal structure is negligible, and the receiving coil has the same received power and output current, the receiving loss can be approximated as follows: Among them, R M For mutual resistance, R R For the ESR when the receiving coil is at its maximum position offset, I T I R P represents the effective current value in the transmitting and receiving coils, respectively. Tran ω represents the active power received by the receiving coil, M represents the operating angular frequency, and M represents the mutual inductance.

[0126] Because of R R Almost independent of the size of the transmitting coil, therefore the minimum receiving loss corresponds to Minimum or maximum.

[0127] Therefore, in the embodiments of this application, it is only necessary to determine the appropriate method. Minimum or The corresponding transmitting coil size in the maximum case greatly reduces the amount of computation.

[0128] 505. Calculate the loss of the transmitting coil.

[0129] After determining the size of the transmitting coil, the loss of the transmitting coil is calculated. The transmitting coil loss refers to the loss generated by the transmitting coil and located on the transmitting side. It can usually exclude the loss generated by the transmitting coil on the receiving side. The transmitting coil loss can be obtained through finite element simulation.

[0130] 506. Determine whether the loss of the transmitting coil is less than or equal to the preset loss. If yes, proceed to step 507; otherwise, proceed to step 511.

[0131] After calculating the loss of the transmitting coil, determine whether the loss of the transmitting coil is less than or equal to the preset loss. If it is greater than the preset loss, the size of the transmitting coil can be redefined.

[0132] 507. Determine whether to reduce the cross-sectional size of the transmitting coil. If yes, proceed to step 508; otherwise, proceed to step 509.

[0133] If the loss of the transmitting coil is less than or equal to the preset loss, that is, if the loss of the transmitting coil is relatively small, it is possible to further consider whether it is necessary to reduce the cross-sectional size or the overall size of the coil.

[0134] 508. Reduce the cross-sectional size of the transmitting coil.

[0135] Reducing the cross-sectional size of the transmitting coil can make the transmitting coil lighter.

[0136] The specific reduction in the cross-sectional size of the transmitting coil can be achieved by adjusting according to a pre-set step size, thereby gradually reducing the cross-sectional size of the transmitting coil.

[0137] 509. Determine whether it is necessary to reduce the external dimensions of the transmitting coil. If yes, proceed to step 510; otherwise, the design ends.

[0138] Optionally, it can be determined whether the external dimensions of the transmitting coil can be reduced. For example, if the size of the transmitting coil is not less than the minimum external dimensions of the transmitting coil, then the external dimensions of the transmitting coil can be further reduced, such as by reducing the coil's external dimensions, side length, or outer diameter.

[0139] 510. Reduce the external dimensions of the maximum transmitting coil.

[0140] Specifically, the maximum size of the transmitting coil can be reduced to achieve a lighter transmitting coil.

[0141] 511. Determine whether to increase the cross-sectional size of the transmitting coil. If not, proceed to step 512; if yes, proceed to step 514.

[0142] If the loss of the transmitting coil is greater than the preset loss, it indicates that the transmission loss is too high. In this case, you can consider increasing the size of the transmitting coil to reduce the loss of the transmitting coil.

[0143] Optionally, it can be determined whether the cross-sectional size of the transmitting coil can be increased. For example, it can be determined whether the cross-sectional size of the transmitting coil is within the allowable cross-sectional size range. If so, the cross-sectional size of the transmitting coil can be increased, that is, step 514 can be executed.

[0144] 512. Determine if the external dimensions of the transmitting coil are at their maximum. If yes, end the iteration; otherwise, proceed to step 513.

[0145] If the transmitting coil loss is too high, it can be determined whether the transmitting coil's external dimensions are already at the maximum range. If not, the minimum coil size can be increased, and the transmitting coil size search can be restarted. If so, the iteration can end, and the current transmitting coil size can be output.

[0146] 513. Increase the minimum coil size.

[0147] The size range determined in steps 503 and 504 may include the range of cross-sectional dimensions and coil outline dimensions. The coil outline dimension range may include the range formed by the minimum coil outline dimension and the maximum coil outline dimension. The loss of the transmitting coil that may be searched in the next iteration can be reduced by increasing the minimum coil outline dimension.

[0148] 514. Increase the cross-sectional size of the transmitting coil.

[0149] The loss of the transmitting coil can be reduced by increasing the cross-sectional size of the transmitting coil.

[0150] In this application, the eddy current loss generated on the receiving side is optimized from the perspective of the transmitting coil design. Typically, with a constant transmission power, reducing the ampere-turns in the receiving coil increases the ampere-turns in the transmitting coil, thus increasing eddy current loss on the receiving side. Existing solutions do not consider eddy current loss in the transmitting coil design, resulting in significant eddy current loss on the receiving side as charging power increases. In this application, for high-power fast-charging wireless charging pads, by limiting the maximum lateral displacement range and increasing the angle of magnetic field concentration of the transmitting coil, the maximum eddy current loss on the phone is reduced within the designed lateral displacement range, thereby improving charging speed. With the design goal of minimizing the loss on the phone (or maximizing the charging speed of the phone-side coil) at the same transmission power and the maximum designed lateral displacement, the optimal dimensions of the multi-layer transmitting coil are determined through finite element analysis (FEA) simulation or vector network analyzer (VNA) measurements.

[0151] In practical design, with the same transmitting coil cross-sectional size, the number of coil turns can be adjusted by changing the wire of different specifications, such as replacing it with Litz wire of different strands, thereby adjusting the coil inductance. From a standardization perspective, only the size, cross-sectional area, and inductance need to be limited. Limitations on size and cross-sectional area ensure coil efficiency, while limitations on inductance ensure the consistency of circuit characteristics.

[0152] The double-layer coil obtained based on the above design method can be compatible with Qi standard wireless charging docks and is more suitable for high-power fast charging applications compared with the coils in the existing Qi wireless charging standard.

[0153] By combining the aforementioned wireless charging coil design method, the coil size of the transmitting coil that meets the requirements can be designed.

[0154] For example, in conjunction with the wireless charging device shown in Figure 2, multiple transmitting coils can be provided in the wireless charging device. For instance, as shown in Figure 6, the wireless charging device can also include a second transmitting coil 303. The method for determining the second transmitting coil is similar to that for determining the first transmitting coil; for example, the size of the second transmitting coil can also be determined using the methods corresponding to those in Figures 4 and 5.

[0155] The following description uses the structure of the first transmitting coil as an example. The structures of other transmitting coils in the wireless charging device can be found in the structure of the first transmitting coil.

[0156] Optionally, the first transmitting coil can be a single-layer coil or at least two-layer coils, thus adapting to different product forms of wireless charging devices.

[0157] In one possible implementation, the first transmitting coil is rectangular or circular in shape, so that the appropriate coil shape can be selected according to different product forms, which has greater versatility.

[0158] In one possible implementation, the side length or diameter of the first transmitting coil is in the range of 33mm to 48mm. The shape of the first transmitting coil is the edge of the shape formed by winding the coil to form the first transmitting coil. Generally, the side length is used to measure the size of a rectangular shape. When the rectangle is a rectangle, the side length can refer to the length or the width. For a circle, the diameter or radius is used to measure the size. The specific size can be determined according to the actual application scenario.

[0159] In one possible implementation, the side length or diameter of the first transmitting coil is in the range of 35 mm to 46 mm.

[0160] In one possible implementation, the side length or diameter of the first transmitting coil is in the range of 35.5mm-36.5mm.

[0161] In one possible implementation, the side length or diameter of the first transmitting coil is in the range of 40.5mm-41.5mm.

[0162] In one possible implementation, the cross-sectional thickness of the first transmitting coil is in the range of 1.8 mm to 2.4 mm.

[0163] In one possible implementation, the distance between the first transmitting coil and the second transmitting coil is in the range of 36mm-38mm.

[0164] For example, taking a case where there are metal structural components such as batteries on the back of the receiving coil, and these components extend beyond the edge of the nanocrystalline magnetic core of the receiving coil, under the conditions of a maximum lateral displacement of 10mm and a coil spacing of 3mm, the MPA2 coil in the Qi standard is modified from a single-layer 12-turn coil with a side length of 48mm, while maintaining the same wire diameter, into a double-layer structure. The simulation results for the corresponding receiving-side charging efficiency under different side lengths are shown in Figure 7. The simulation results show that when the side length of the double-layer coil is 41mm, the receiving-side charging efficiency is the highest, the loss is the lowest, and it is most conducive to achieving fast charging. The corresponding coil design scheme is shown in Figure 8, and the corresponding parameters are shown in Table 1. Generally, this specification of coil is preferred when the shape design of the transmitting coil allows.

[0165] Table 1

[0166] If a smaller design is desired or structural interference is avoided, and the size of the transmitting coil is allowed to be smaller than the size corresponding to the maximum charging speed, then the size of the transmitting coil should be made as large as possible within the structural limits. For example, in a stand-type wireless charging pad for mobile phones with dual transmitting coils, the two coils need to be spaced about 37mm apart to support both vertical and horizontal charging states of the phone. In this case, when using a dual-layer coil design, the coil side length is preferably about 36mm, and its specific specifications are shown in Table 2.

[0167] Table 2

[0168] For single-coil wireless charging bases, the circular coil shown in Figure 9 is preferred when the shape allows, as it usually provides better performance than the rectangular coil. The specifications of the circular coil with the same maximum external dimensions as the two types of square double-layer transmitting coils are shown in Tables 3 and 4, respectively.

[0169] Table 3

[0170] Table 4

[0171] Therefore, the wireless charging device provided in this application embodiment has a transmitting coil that is compatible with Qi wireless charging fast charging docks. Compared with existing Qi standard coil solutions, it has lower loss on the mobile phone side and is more suitable for high-power fast charging applications.

[0172] Furthermore, embodiments of this application also provide a wireless charging coil design apparatus for executing the aforementioned method process.

[0173] Referring to Figure 10, an embodiment of this application provides a structural schematic diagram of a wireless charging coil design device, which includes:

[0174] The position determination module 1001 is used to determine the relative positional relationship between the transmitting coil and the receiving coil based on the offset range, where the offset range is the range of relative positional offset between the transmitting coil and the receiving coil when transferring energy.

[0175] The loss determination module 1002 is used to obtain the receiving-side loss of multiple coil sizes of the transmitting coil according to the relative position relationship, where multiple coil sizes are the coil setting scheme in the transmitting coil;

[0176] The filtering module 1003 is used to determine the first coil size from multiple coil sizes based on the receiving-side loss corresponding to multiple coil sizes;

[0177] The output module 1004 is used to set the size of the first coil as the setting scheme of the transmitting coil if the size of the first coil meets the preset conditions.

[0178] In one possible implementation, the position determination module 1001 is specifically used to determine the relative positional relationship between the transmitting coil and the receiving coil based on the maximum possible offset range between the transmitting coil and the receiving coil.

[0179] In one possible implementation, the loss determination module 1002 is specifically used to traverse the coil configuration schemes of the transmitting coil to obtain multiple coil sizes; and to simulate the transmitting coil according to the multiple coil sizes based on the relative positional relationship to obtain the receiving-side loss corresponding to the energy transferred from the transmitting coil to the receiving coil.

[0180] In one possible implementation, the loss determination module 1002 is specifically used for:

[0181] The size range of the transmitting coil is determined based on the preset coil information. The size range includes the cross-sectional dimensions and the overall dimensions of the transmitting coil.

[0182] By traversing various coil configuration schemes with cross-sectional dimensions of the transmitting coil under the constraint of the coil's external dimensions, multiple coil dimensions are obtained. One of the coil dimensions includes at least one of the following: coil side length, inner diameter, outer diameter, inner width, outer width, and thickness.

[0183] In one possible implementation, the output module 1004 is further configured to adjust the size range of the transmitting coil if the size of the first coil does not meet the preset conditions, and obtain a new size of the first coil based on the adjusted size range.

[0184] In one possible implementation, the output module 1004 is specifically used to increase the cross-sectional size of the transmitting coil, or to increase the minimum coil outline size of the transmitting coil.

[0185] In one possible implementation, the preset conditions include whether the transmit coil loss corresponding to the first coil size is less than a first threshold.

[0186] In one possible implementation, the output module 1004 is further configured to reduce the size range of the transmitting coil when the transmitting coil loss corresponding to the first coil size is less than a first threshold, and obtain a new first coil size based on the reduced size range.

[0187] In one possible implementation, the screening module 1003 is used to determine the first N coil sizes from a variety of coil sizes as the first coil size in order of increasing receiving-side loss of multiple coil sizes, where N is a positive integer.

[0188] In one possible implementation, the transmitting coil is a coil with at least two layers.

[0189] Figure 11 shows a schematic diagram of the hardware structure of a computing device 110 provided in an embodiment of this application. This computing device 110 can be used to implement the steps of the methods shown in Figures 4 and 5 above.

[0190] The computing device 110 shown in Figure 11 may include a processor 1101, a memory 1102, a communication interface 1103, and a bus 1104. The processor 1101, the memory 1102, and the communication interface 1103 can be connected to each other via the bus 1104.

[0191] The processor 1101 is the control center of the computing device 110. It can be a general-purpose central processing unit (CPU) or other general-purpose processors. The general-purpose processor can be a microprocessor or any conventional processor, such as a GPU or NPU, and can be adapted to the actual application scenario.

[0192] As an example, processor 1101 may include one or more CPUs, and may also include other processors, such as the CPU, NPU or GPU shown in Figure 11.

[0193] The memory 1102 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0194] In one possible implementation, the memory 1102 may exist independently of the processor 1101. The memory 1102 can be connected to the processor 1101 via a bus 1104 and is used to store data, instructions, or program code. When the processor 1101 calls and executes the instructions or program code stored in the memory 1102, it can implement the methods provided in the embodiments of this application, such as the methods shown in Figures 4 and 5.

[0195] In another possible implementation, the memory 1102 can also be integrated with the processor 1101.

[0196] The communication interface 1103 is used for the computing device 110 to connect with other devices via a communication network, which may be Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. The communication interface 1103 may include a receiving unit for receiving data and a transmitting unit for sending data.

[0197] Bus 1104 can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, or an extended industry standard architecture (EISA) bus. This bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 11, but this does not indicate that there is only one bus or one type of bus.

[0198] It should be noted that the structure shown in FIG11 does not constitute a limitation on the computing device 110. In addition to the components shown in FIG11, the computing device 110 may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0199] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product.

[0200] This application also provides a computer-readable storage medium storing a program for training a model or performing inference tasks, which, when run on a computer, causes the computer to perform all or part of the steps in the methods described in the embodiments shown in Figures 4 to 5 above.

[0201] This application also provides a digital processing chip. This digital processing chip integrates circuitry for implementing the aforementioned processor or processor functions, and one or more interfaces. When the digital processing chip integrates a memory, it can perform the method steps of any one or more of the foregoing embodiments. When the digital processing chip does not integrate a memory, it can be connected to an external memory via a communication interface. The digital processing chip implements the method steps of any one or more of the foregoing embodiments based on the program code stored in the external memory.

[0202] This application also provides a computer program product comprising one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in this application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state disk (SSD)).

[0203] Optionally, embodiments of this application also provide a chip, comprising: a processing unit and a communication unit. The processing unit may be, for example, a processor, and the communication unit may be, for example, an input / output interface, pins, or circuits. The processing unit can execute computer execution instructions stored in a storage unit to cause the chip to execute the methods described in the embodiments shown in Figures 4 and 5. Optionally, the storage unit may be a storage unit within the chip, such as a register or cache. Alternatively, the storage unit may be a storage unit located outside the chip within the wireless access device, such as a read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, such as random access memory (RAM).

[0204] It should also be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. In addition, in the device embodiment drawings provided in this application, the connection relationship between modules indicates that they have a communication connection, which can be implemented as one or more communication buses or signal lines.

[0205] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application 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 described herein can be implemented in a sequence other than that illustrated or described herein. The term "and / or" in this application is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following related objects are in an "or" relationship. 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 device that includes a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to such processes, methods, products, or devices. The naming or numbering of steps in this application does not imply that the steps in the method flow must be executed in the time / logical order indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effect can be achieved. The division of modules in this application is a logical division. In actual applications, there may be other division methods. For example, multiple modules may be combined into or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the modules shown or discussed may be through some ports, and the indirect coupling or communication connection between modules may be electrical or other similar forms, which are not limited in this application. Furthermore, the modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed in multiple circuit modules. Some or all of the modules can be selected to achieve the purpose of the solution in this application according to actual needs.

Claims

1. A wireless charging coil design method, characterized in that, include: The relative positional relationship between the transmitting coil and the receiving coil is determined based on the offset range, wherein the offset range is the range of relative positional offset between the transmitting coil and the receiving coil when energy is transferred. The receiving-side loss of the transmitting coil with various coil sizes is obtained based on the relative positional relationship, and the various coil sizes are the coil arrangement scheme in the transmitting coil; The first coil size is determined from the multiple coil sizes based on the receiving-side loss corresponding to the multiple coil sizes; If the size of the first coil meets the preset conditions, then the size of the first coil is used as the setting scheme for the transmitting coil.

2. The method according to claim 1, characterized in that, Determining the relative positional relationship between the transmitting coil and the receiving coil based on the offset range between the transmitting coil and the receiving coil includes: The relative positional relationship between the transmitting coil and the receiving coil is determined based on the maximum possible offset range between them.

3. The method according to claim 1 or 2, characterized in that, The step of obtaining the receiver-side loss corresponding to various coil sizes of the transmitting coil based on the relative positional relationship includes: By iterating through the coil configuration schemes of the transmitting coil, the various coil sizes are obtained; Based on the relative positional relationship, the transmitting coil is simulated according to the various coil sizes to obtain the receiving-side loss corresponding to the energy transferred from the transmitting coil to the receiving coil.

4. The method according to claim 3, characterized in that, The method further includes: The size range of the transmitting coil is determined based on preset coil information, and the size range includes the cross-sectional dimensions and the overall dimensions of the transmitting coil. The process of iterating through the coil configuration schemes of the transmitting coil yields the various coil sizes, including: Under the constraint of the coil's external dimensions, the coil configuration schemes of the transmitting coil with the cross-section of the specified dimensions are traversed to obtain the various coil dimensions, wherein one of the coil dimensions includes at least one of the coil's side length, inner diameter, outer diameter, internal width, and outer width.

5. The method according to claim 4, characterized in that, The method further includes: If the size of the first coil does not meet the preset conditions, the size range of the transmitting coil is adjusted, and a new first coil size is obtained based on the adjusted size range.

6. The method according to claim 5, characterized in that, Adjusting the size range of the transmitting coil includes: Increase the cross-sectional size of the transmitting coil, or increase the minimum coil outline size of the transmitting coil.

7. The method according to any one of claims 3-6, characterized in that, The preset conditions include whether the loss of the transmitting coil corresponding to the first coil size is less than a first threshold.

8. The method according to claim 7, characterized in that, The method further includes: If the loss of the transmitting coil corresponding to the first coil size is less than the first threshold, the size range of the transmitting coil is reduced, and a new first coil size is obtained based on the reduced size range.

9. The method according to any one of claims 1-8, characterized in that, The step of determining the first coil size from the multiple coil sizes based on the receiving-side loss corresponding to the multiple coil sizes includes: The first N coil sizes are determined from the plurality of coil sizes in ascending order of receiving-side loss, where N is a positive integer.

10. The method according to any one of claims 1-9, characterized in that, The transmitting coil has at least two layers of coils.

11. A wireless charging device, characterized in that, include: The first transmitting coil is used to transfer energy to the outside through a magnetic field; A controller is used to control the first transmitting coil to transfer energy to the outside through a magnetic field.

12. The device according to claim 11, characterized in that, The first transmitting coil comprises a transmitting coil obtained by the method described in any one of claims 1-8.

13. The device according to claim 11 or 12, characterized in that, The first transmitting coil has at least two layers of coils.

14. The device according to any one of claims 11-13, characterized in that, The first transmitting coil is rectangular or circular in shape.

15. The device according to any one of claims 11-14, characterized in that, The side length or diameter of the first transmitting coil is in the range of 33mm to 48mm.

16. The device according to claim 15, characterized in that, The side length or diameter of the first transmitting coil is in the range of 35mm to 46mm.

17. The device according to claim 15 or 16, characterized in that, The side length or diameter of the first transmitting coil is in the range of 35.5mm-36.5mm.

18. The device according to claim 15 or 16, characterized in that, The side length or diameter of the first transmitting coil is in the range of 40.5mm-41.5mm.

19. The device according to any one of claims 11-18, characterized in that, The wireless charging device further includes a second transmitting coil, which comprises a transmitting coil obtained by any one of claims 1-8.

20. The device according to claim 19, characterized in that, The distance between the first transmitting coil and the second transmitting coil is in the range of 36mm-38mm.

21. A wireless charging system, characterized in that, include: Wireless charging devices and terminals; The wireless charging device includes the device as described in any one of claims 11-20; The terminal is used to replenish energy through the energy transferred by the wireless charging device.

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