Wireless Charging Device and Wireless Charging Method

Abstract

The present invention provides a wireless charging device comprising: a housing, a carrying device, a drive device, and a plurality of transmitting coils; the housing having a receiving space, the carrying device and the drive device being disposed within the receiving space; the drive device driving the carrying device to rotate, causing the plurality of transmitting coils disposed on the carrying device to perform circular motion around the axis of the carrying device to an optimal coupling position with the device to be charged; the plurality of transmitting coils are radially offset from one another and spaced apart on the carrying device, such that the circular coverage areas formed by the circular motions of two adjacent transmitting coils partially overlap. The present invention also provides a wireless charging method.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging, and in particular to a wireless charging device and a charging method. Background Art

[0002] Wireless charging technology based on the WPC or Qi protocols is based on near-field magnetic induction, which transfers energy from the primary coil to the secondary coil, thereby achieving wireless power transmission. To improve the system efficiency of wireless charging, it is generally required that the coils on the transmitting and receiving ends must be aligned and close together as much as possible. Although wireless charging based on the Airfuel protocol does not require perfect alignment, it will result in a significant decrease in charging efficiency. Therefore, both WPC and Airfuel aim to align the receiving and transmitting coils as closely as possible to improve system efficiency. Wireless charging devices are often limited by space or coil size, resulting in a relatively low degree of spatial freedom in actual use, which affects the user's wireless charging experience.

[0003] Currently, there are two main technical approaches to increasing spatial freedom. One is to use a multi-coil combination on the transmitter side. This approach is limited by the number of coils. Too many coils will significantly increase costs, and the overlapping of too many coils will reduce charging efficiency. Conversely, too few coils will limit the expansion of spatial freedom and cannot achieve the purpose of free placement. The other approach is to use a single-coil movement method on the transmitter side. This method involves building horizontal (X-axis) and vertical (Y-axis) guide rails and stepper motors inside the base of the charging device. A microcontroller controls the movement of the coil to gradually approach or align it with the device to be charged. The need to build in two independent sets of guide rails and motor equipment increases the cost of the overall device and the complexity of control. There are also wireless charging devices with a built-in single motor and multiple coils, but there are still problems such as low charging efficiency caused by the overlapping of multiple coils. Summary of the Invention

[0004] Based on this, in order to solve the shortcomings of the above solutions, the present invention provides a wireless charging device and a wireless charging method with a simple structure, low cost and high coil coupling.

[0005] To achieve the above-mentioned objectives, the present invention provides a wireless charging device, comprising: a housing, a carrying device, a driving device, and a plurality of transmitting coils; the housing having a receiving space, the carrying device and the driving device being disposed within the receiving space; the driving device driving the carrying device to rotate, causing the plurality of transmitting coils disposed on the carrying device to perform circular motion around the axis of the carrying device to an optimal coupling position with a device to be charged; wherein the plurality of transmitting coils are radially offset from each other along the carrying device and are spaced apart on the carrying device, and the circular coverage areas formed by the circular motions of two adjacent transmitting coils partially overlap.

[0006] Preferably, the coverage area formed by the circular motion of the plurality of transmitting coils is a charging coverage area.

[0007] Preferably, the number of the transmitting coils is 3, 4 or N, the centers of the transmitting coils are not on the same straight line, and the radius of the charging coverage area is smaller than the sum of the diameters of the transmitting coils.

[0008] Preferably, the carrying device is a disk, the disk is a printed circuit board, and the transmitting coil is printed on the disk.

[0009] Preferably, the central angle formed by the center of the disk and the straight lines where the centers of two adjacent transmitting coils are located is an integer multiple of the minimum angle of rotation of the disk.

[0010] In order to achieve the above object, the present invention also provides a wireless charging method, comprising the following steps:

[0011] S10, detecting whether there is a device to be charged on the wireless charging device, and if so, sending a charging instruction;

[0012] S20, receiving the charging instruction, and controlling the transmitting coil to establish a charging connection with the device to be charged;

[0013] S30. Obtain a current charging efficiency value of the transmitting coil, and compare the obtained charging efficiency value with a preset value; when the charging efficiency value is higher than the preset value, the transmitting coil continues to charge the device to be charged at the current position; when the charging efficiency value is lower than the preset value, rotate the carrying device to change the position of the transmitting coil until the charging efficiency value is higher than the preset value.

[0014] Preferably, the step of “S10, detecting whether there is a device to be charged on the wireless charging device” includes:

[0015] The Q value of the transmitting coil is used to alternately detect whether there is a device to be charged and compare the Q value with a preset threshold;

[0016] If the Q value is lower than the preset threshold, it is determined that there is a device to be charged;

[0017] If the Q value is higher than the preset threshold, the carrier device is controlled to rotate clockwise or counterclockwise, and the Q value of the transmitting coil is used to alternately detect whether there is a device to be charged. The Q value is compared with the preset threshold until one scan is completed and a cycle of detection is completed.

[0018] Preferably, the step of "S30, obtaining the current charging efficiency value of the transmitting coil, and when the charging efficiency value is lower than a preset value, rotating the carrying device to change the position of the transmitting coil until the charging efficiency value is higher than the preset value" includes:

[0019] Controlling the transmitting coil on the carrying device to rotate to a next preset position;

[0020] Obtaining a charging efficiency value of the transmitting coil at a current preset position;

[0021] Comparing the charging efficiency values of the current preset position with the previous preset position, if the charging efficiency value is higher than the charging efficiency value of the previous preset position, continue rotating in the same direction for another preset position until the charging efficiency value of the current preset position is higher than the preset value;

[0022] If the charging efficiency value is lower than the charging efficiency value of the previous preset position, the motor rotates in the opposite direction to the next preset position of the original preset position until the charging efficiency value of the current preset position is higher than the preset value.

[0023] Preferably, the wireless charging method further includes step S40:

[0024] Controlling the transmitting coil to rotate to a next preset position;

[0025] Obtaining a charging efficiency value of the transmitting coil at a current preset position;

[0026] Compare the charging efficiency values of the current preset position with the previous preset position; if the current charging efficiency value is higher than the charging efficiency value of the previous preset position, continue to move one preset position in the same direction until the position with the highest charging efficiency value is obtained; if the current charging efficiency value is lower than the previous preset charging efficiency value, move in the opposite direction to the next preset position until the position with the highest charging efficiency value is obtained.

[0027] Preferably, the wireless charging method further includes step S50:

[0028] When charging is completed, other areas are scanned periodically to detect whether there is a new device to be charged. If a new device to be charged is detected, the charging method is repeated.

[0029] The present invention provides a wireless charging device and method that can be freely placed. By improving the transmitting coil support device and more rationally arranging the transmitting coil, the free placement space of the wireless charging device is greatly increased while minimizing the increase in hardware cost or control complexity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a frontal anatomical diagram of an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the placement of three transmitting coils according to an embodiment of the present invention;

[0032] Figure 3This is a schematic diagram of the placement of four transmitting coils according to an embodiment of the present invention;

[0033] Figure 4 Schematic diagram of the placement of five transmitting coils according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0035] Hereinafter, many aspects of the present invention will be better understood with reference to the accompanying drawings. The components in the drawings are not necessarily drawn to scale. Instead, emphasis is placed on clearly illustrating the components of the present invention. In addition, like reference numerals indicate corresponding parts throughout the several views of the drawings.

[0036] As used herein, the words "exemplary" or "illustrative" mean serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" or "illustrative" is not necessarily to be construed as preferred or advantageous over other embodiments. All embodiments described below are exemplary embodiments, provided to facilitate a better understanding of the present invention by those skilled in the art. For the purposes of this description, the terms "upper," "lower," "left," "right," "front," "back," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplification of the present invention. They are not intended to indicate or imply that the devices or elements referred to must have, be constructed, or operate in a particular orientation. Furthermore, there is no intention to be bound by any express or implied theory presented in the preceding technical field, background, summary, or detailed description below. It should also be understood that the specific devices and processes shown in the drawings and described in the following description are simple exemplary embodiments of the inventive concepts defined in the appended claims. Therefore, specific dimensions and other physical characteristics associated with the embodiments disclosed herein should not be construed as limiting unless expressly stated otherwise in the claims.

[0037] Please refer to Figure 1The present invention provides a wireless charging device, comprising a housing 1, a driving device 2 for driving, a disc 3, a plurality of transmitting coils 4, a central axis 5, a base 6, and a microcontroller 7. The housing 1 adopts a cylindrical structure, and the interior of the housing 1 is hollow to form a receiving space, which can accommodate various components of the wireless charging device. Specifically, the base 6 is located at the bottom of the wireless charging device, and the base 6 is connected to the disc 3 through the central axis 5 located on the axis of the disc 3, so that the disc 3 rotates clockwise or counterclockwise around the central axis 5, that is, the axis of the disc 3. The driving device 2 drives the disc 3 to rotate, so that the plurality of transmitting coils 4 provided on the disc 3 perform a circular motion around the axis of the disc 3 to the optimal coupling position with the device to be charged.

[0038] Furthermore, the disk 3 is one implementation of a carrier device for a wireless charging device. Although the carrier device in the embodiment of the present invention is a disk 3, it can also be other shapes, such as an elliptical disk, a star-shaped disk, etc. The disk 3 is used to carry components. Specifically, a number of transmitting coils 4, a microcontroller 7, etc. are provided on the disk 3. In optional embodiments, the disk 3 can be made of different materials, and the carrying capacity and reliability need to be comprehensively considered. In an embodiment of the present invention, the disk 3 is made using a printed circuit board (PCB), which facilitates the direct printing of the required components and wiring on the PCB.

[0039] Furthermore, in an optional embodiment, the transmitting coil 4 can be a discrete coil and soldered on the PCB disc 3. In another optional embodiment, the transmitting coil 4 can be directly printed on the PCB disc 3, which can more effectively reduce the production cost and improve the reliability of the disc 3. For details, please refer to Figure 2-4 The transmitting coils 4 are offset from each other along the radial direction of the disk 3 and are spaced apart on the disk 3. The transmitting coils 4 are staggered at specific angles to avoid direct overlap. That is, the positions of the transmitting coils 4 on the disk 3 do not overlap at all and there is no direct contact. Because the transmitting coils 4 on the disk 3 are placed in this way, when multiple transmitting coils 4 are printed directly on the PCB, a PCB material with fewer layers (such as 2 layers) can be used. Compared with other methods of printing multiple coils on the PCB, which require multiple layers of material (such as 4 layers, 8 layers or even more), the present invention can greatly reduce the cost of PCBs. The surface area above the disk 3 is the charging panel of the charging device, which is used to place and charge single or multiple devices to be charged.

[0040] Furthermore, based on the detected signal, microcontroller 7 determines whether a device to be charged is placed on the wireless charging device. If so, it sends a control signal to drive device 2. Drive device 2 can be located at the bottom of the wireless charging device and can be a motor or motor. Drive device 2 uses gears, bearings, or other driving mechanisms to drive disk 3 in a clockwise or counterclockwise circular motion around central axis 5, i.e., rotation around the axis of disk 3. Transmitter coil 4 rotates with disk 3 to a certain position, ensuring maximum alignment with receiver coil, and then enters the power transmission phase. This significantly improves the system efficiency reduction caused by poor coupling between the transmitting and receiving coils in wireless charging.

[0041] Specifically, the coverage area formed by the circular motion of the transmitting coil 4 is the charging coverage area 10. The area of the wireless charging device's charging coverage area 10 depends on the number of transmitting coils 4 and the size of each transmitting coil 4. Since the centers of the transmitting coils 4 are not collinear, the radius of the charging coverage area 10 is smaller than the sum of the diameters of the transmitting coils 4. Due to the arrangement of the transmitting coils 4 in the present invention, the required height above the disk 3 can be minimized, thereby improving the coupling tightness between the transmitting and receiving coils. Furthermore, the circular coverage areas formed by the circular motion of two adjacent transmitting coils 4 partially overlap. This prevents the transmission coil 4 from coupling with the device being charged, or coupling with the device being charged too weakly, when placed between two adjacent transmitting coils. The size of this overlapping area can be adjusted according to actual application needs. Assuming the same charging coverage area is to be achieved, a larger overlapping area requires more transmitting coils to cover the area, which has the advantage of improving the transmission coil coverage accuracy in the radial direction of the disk 3.

[0042] The tangential coverage accuracy of the transmitting coil 4 on the disk 3 depends on the minimum angular accuracy of the disk 3's rotation. In principle, a smaller rotation angle achieves greater tangential resolution, meaning finer resolution. However, if the resolution is too high, excessive rotations will result, increasing the time required to align the transmitting coil 4 with the receiving coil. This also requires higher control precision for the drive device 2, further impacting manufacturing costs. Therefore, various factors, such as resolution, time, and cost, must be considered, along with varying coil or disk sizes, to determine the optimal solution for the application.

[0043] In an alternative embodiment, the disk 3 is tangentially divided into 32 equal steps, sufficient to cover the entire charging coverage area 10. This results in a minimum rotation angle of 360 degrees / 32 = 11.25 degrees, referred to as the angle basis. When controlling the tangential rotation of the disk 3, steps #1 through #32 (the angle basis) can be numbered to facilitate algorithmic control of the rotation angle setting. Alternatively, the disk 3 can be tangentially divided into 8, 16, or another number of equal steps, depending on practical needs.

[0044] Furthermore, the central angle formed by the center of disk 3 and the line containing the centers of two adjacent transmitting coils 4 is an integer multiple of the minimum angle of disk 3 rotation. That is, the tangentially offset angular positions of the multiple transmitting coils 4 are selected to be integer multiples (1 to 32) of the angle base. This ensures that all transmitting coils 4 are positioned on a known multiple of the angle base, and the minimum rotational accuracy of disk 3 only needs to be equal to the angle base.

[0045] The following further illustrates the values of the offset angles of the disk 3 when there are different numbers of transmitting coils 4 .

[0046] See Figure 2 , shows an example of the placement of three transmitting coils. The first transmitting coil 41 and the second transmitting coil 42 are at relative angles of 45 degrees (#4) and 225 degrees (#20), respectively, while the third transmitting coil 43 is at an angle of 180 degrees (#16). In this example, all positions are integer multiples of the angle base (11.25 degrees).

[0047] See Figure 3 , which shows an example of placement of four transmitting coils. The first transmitting coil 41 and the second transmitting coil 42 are at relative angles of 112.5 degrees (#10) and 292.5 degrees (#26), respectively. The third transmitting coil 43 is at an angle of 225 degrees (#20), and the fourth transmitting coil 44 is at an angle of 180 degrees (#16). In this example, all positions are integer multiples of the angle base (11.25 degrees).

[0048] See Figure 4 , shows an example of placement of five transmitting coils. The first transmitting coil 41 and the second transmitting coil 42 are at relative angles of 135 degrees (#12) and 315 degrees (#28), respectively. The third transmitting coil 43 is at an angle of 258.75 degrees (#23). The fourth transmitting coil 44 is at an angle of 213.75 degrees (#19). The fifth transmitting coil 45 is at an angle of 180 degrees (#16). All positions in this example are integer multiples of the angular base (11.25 degrees).

[0049] The above only illustrates the placement position of the transmitting coil 4. In actual production, other placement angles or angle bases of different sizes can be selected according to the actual situation.

[0050] Based on the same principle, more transmitting coils 4 , such as 6 or 7, can be added according to different application requirements to expand the area of the charging coverage area 10 of the disk 3 .

[0051] The present invention also provides a charging method for a wireless charging device, comprising the following steps:

[0052] S10, detecting whether there is a device to be charged on the wireless charging device, and if so, sending a charging instruction;

[0053] S20, receiving the charging instruction and controlling the transmitting coil 4 to establish a charging connection with the device to be charged;

[0054] S30. Obtain the current charging efficiency value of the transmitting coil 4 and compare the obtained charging efficiency value with a preset value. When the charging efficiency value is higher than the preset value, the transmitting coil 4 continues to charge the device to be charged at the current position. When the charging efficiency value is lower than the preset value, the carrier disc 3 is rotated to change the position of the transmitting coil 4 until the charging efficiency value is higher than the preset value.

[0055] Specifically, in step S10, "detecting whether there is a device to be charged on the wireless charging device," auxiliary facilities or methods for periodic operation or servoing can be used, such as auxiliary positioning coils, transmitter coil Q-value detection, gravity sensors, infrared sensors, or other sensors. This can avoid or reduce the high-frequency periodic activation of the drive motor when there is no device to be charged, thereby reducing standby power consumption and extending motor life.

[0056] Furthermore, in step S10 of the present invention, a Q value detection method for the transmitting coil is selected for inspection, which specifically includes the following steps:

[0057] The Q value of the transmitting coil 4 is used to alternately detect whether there is a device to be charged, and the Q value is compared with a preset threshold;

[0058] If the Q value is lower than the preset threshold, it is determined that there is a device to be charged;

[0059] If the Q value is higher than the preset threshold, the control disk 3 rotates clockwise or counterclockwise, and the Q value of the transmitting coil 4 is used to alternately detect whether there is a device to be charged. The Q value is compared with the preset threshold until one scan is completed, completing a cycle of detection.

[0060] Furthermore, when using Q-value detection, due to the large surface area of the charging device, the fixed-position transmitting coil 4 may not be able to detect the sensing area, leaving some areas unreachable. Therefore, at the current location: first, the Q-value of the transmitting coil 4 can be used alternately to detect the presence of a device to be charged; then, the Q-value of the transmitting coil 4 can be rotated 90 degrees clockwise, and the Q-value of the transmitting coil 4 can be used alternately again; then, the Q-value of the transmitting coil 4 can be rotated 90 degrees clockwise again, and the Q-value of the transmitting coil 4 can be used alternately again; finally, the Q-value of the transmitting coil 4 can be rotated 90 degrees clockwise again, and the Q-value of the transmitting coil 4 can be used alternately again. By combining these four detection steps, the entire charging coverage area 10 of the wireless charging device can be fully covered, preventing omissions. The purpose of Q-value detection is to detect devices to be charged, so it needs to be periodically activated, depending on the application needs. Due to the simple operation of Q-value detection, the need for power transmission and the short detection time, it can greatly improve detection efficiency while avoiding frequent high-power operation.

[0061] After the Q value detection scans for one week, the detection values of different transmitting coils 4 during all scanning and detection processes are compared. In terms of the Q value detection principle, the closer the distance between the transmitting coil and the receiving coil, the smaller the detected value. When it is found that among all the detection values, there is a Q value threshold lower than the preset value, it can be preliminarily determined that a device to be charged has been placed in. The microcontroller 7 records and obtains the transmitting coil position (#1-#32) and the transmitting coil number where the minimum value appears, and then controls the driving device 2 to rotate the disc 3 to the corresponding position, and attempts to establish a connection with the device to be charged through the transmitting coil 4 with the minimum value, such as the WPC or Qi protocol. If the connection cannot be established, it is possible that the detected device is not a valid device to be charged, for example, it may be a metal foreign object, etc., and the charging device returns to the periodic detection state.

[0062] Furthermore, the step of “S30, obtaining a current charging efficiency value of the transmitting coil, and when the charging efficiency value is lower than a preset value, rotating the carrying device to change the position of the transmitting coil until the charging efficiency value is higher than the preset value” includes:

[0063] Control the transmitting coil 4 on the disk 3 to rotate to the next preset position;

[0064] Obtaining the charging efficiency value of the current preset position of the transmitting coil 4;

[0065] Comparing the charging efficiency values of the current preset position with the previous preset position, if the charging efficiency value is higher than the charging efficiency value of the previous preset position, continue rotating in the same direction for another preset position until the charging efficiency value of the current preset position is higher than the preset value;

[0066] If the charging efficiency value is lower than the charging efficiency value of the previous preset position, the motor rotates in the opposite direction to the next preset position of the original preset position until the charging efficiency value of the current preset position is higher than the preset value.

[0067] The specific comparison algorithm can use a binary search or a simple round-robin comparison method. If the efficiency value at any point in the above process exceeds a preset value, the search is considered complete. During the optimization process, the connection can be maintained without interrupting power transmission, so there is no need to worry about the optimization process time. If the connection is interrupted due to an unexpected rotation, the connection is returned to the original position and reconnected.

[0068] Preferably, in an optional embodiment, the wireless charging method further includes step S40:

[0069] The transmitting coil 4 is controlled to rotate to the next preset position; the charging efficiency value of the transmitting coil 4 at the current preset position is obtained; the charging efficiency values of the current preset position and the previous preset position are compared; if the current charging efficiency value is higher than the charging efficiency value of the previous preset position, the transmitting coil 4 is continuously moved in the same direction by one preset position until the position with the highest charging efficiency value is obtained; if the current charging efficiency value is lower than the previous preset charging efficiency value, the transmitting coil 4 is moved in the opposite direction to the next preset position until the position with the highest charging efficiency value is obtained. In other words, the position with the best efficiency value is preferably selected.

[0070] Once the optimal position is determined, the wireless charging device begins to stably and continuously provide power to the device to be charged.

[0071] Furthermore, the wireless charging method also includes step S50: when charging is completed, continue to periodically scan other areas to detect whether there are new devices to be charged. If a new device to be charged is detected, repeat steps S10-S30 or repeat steps S10-S40. If the charged device is still placed in the charging coverage area 10, when no new device to be charged is added, the charging device can still periodically charge the device again. Due to this embodiment, the area of the charging coverage area 10 of the wireless charging device is effectively increased, and multiple devices to be charged can be placed at the same time or in a time-sharing manner. Therefore, with the support of the control algorithm of the microcontroller 7, the charging device can support the charging of multiple devices in sequence, or preferably charge the device with less power first, or charge in a time-sharing manner, etc., until all detected devices are fully charged, and the charging device returns to the periodic servo state.

[0072] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above embodiments merely represent preferred embodiments of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A wireless charging device, characterized in that: include: A housing, a carrying device, a driving device and a plurality of transmitting coils; The housing has a receiving space, and the carrying device and the driving device are arranged in the receiving space; The driving device drives the carrying device to rotate, causing the plurality of transmitting coils disposed on the carrying device to perform circular motion around the axis of the carrying device to a position optimally coupled with the device to be charged. The plurality of transmitting coils are radially offset from one another and spaced apart on the carrying device, and the circular coverage areas formed by the circular motions of two adjacent transmitting coils partially overlap.

2. The wireless charging device according to claim 1, wherein: The coverage area formed by the circular motion of the transmitting coils is the charging coverage area.

3. The wireless charging device according to claim 2, wherein: There are N transmitting coils, the centers of the transmitting coils are not on the same straight line, the radius of the charging coverage area is smaller than the sum of the diameters of the transmitting coils, and N is greater than 2.

4. The wireless charging device according to claim 1, wherein: The carrying device is a disk, the disk is a printed circuit board, and the transmitting coil is printed on the disk.

5. The wireless charging device according to claim 4, wherein: The central angle formed by the center of the disk and the straight lines where the centers of two adjacent transmitting coils are located is an integer multiple of the minimum angle of rotation of the disk.

6. A wireless charging method based on the wireless charging device according to any one of claims 1 to 5, characterized in that: The steps include: S10, detecting whether there is a device to be charged on the wireless charging device, and if so, sending a charging instruction; S20, receiving the charging instruction, and controlling the transmitting coil to establish a charging connection with the device to be charged; S30. Obtain a current charging efficiency value of the transmitting coil, and compare the obtained charging efficiency value with a preset value; when the charging efficiency value is higher than the preset value, the transmitting coil continues to charge the device to be charged at the current position; when the charging efficiency value is lower than the preset value, rotate the carrying device to change the position of the transmitting coil until the charging efficiency value is higher than the preset value.

7. The wireless charging method according to claim 6, wherein: The step of “S10, detecting whether there is a device to be charged on the wireless charging device” includes: Alternately detecting whether there is a device to be charged by using the Q value of the transmitting coil, and comparing the Q value with a preset threshold; If the Q value is lower than the preset threshold, it is determined that there is a device to be charged; If the Q value is higher than the preset threshold, the carrier device is controlled to rotate clockwise or counterclockwise, and the Q value of the transmitting coil is used to alternately detect whether there is a device to be charged. The Q value is compared with the preset threshold until one scan is completed and a cycle of detection is completed.

8. The wireless charging method according to claim 6, wherein: The step of "S30, obtaining the current charging efficiency value of the transmitting coil, and when the charging efficiency value is lower than a preset value, rotating the carrying device to change the position of the transmitting coil until the charging efficiency value is higher than the preset value" includes: Controlling the transmitting coil on the carrying device to rotate to a next preset position; Obtaining a charging efficiency value of the transmitting coil at a current preset position; Comparing the charging efficiency values of the current preset position with the previous preset position, if the charging efficiency value is higher than the charging efficiency value of the previous preset position, continue rotating in the same direction for another preset position until the charging efficiency value of the current preset position is higher than the preset value; If the charging efficiency value is lower than the charging efficiency value of the previous preset position, the motor rotates in the opposite direction to the next preset position of the original preset position until the charging efficiency value of the current preset position is higher than the preset value.

9. The wireless charging method according to claim 6, further comprising step S40: Controlling the transmitting coil to rotate to a next preset position; Obtaining a charging efficiency value of the transmitting coil at a current preset position; Compare the charging efficiency values of the current preset position with the previous preset position; If the current charging efficiency value is higher than the charging efficiency value of the previous preset position, continue to move one preset position in the same direction until the position with the highest charging efficiency value is obtained; if the current charging efficiency value is lower than the previous preset charging efficiency value, move in the opposite direction to the next preset position until the position with the highest charging efficiency value is obtained.

10. The wireless charging method according to claim 6, wherein: The wireless charging method further includes step S50: When charging is completed, other areas are scanned periodically to detect whether there is a new device to be charged. If a new device to be charged is detected, steps S10-S30 are repeated.

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