Wireless charging system and control method thereof

Abstract

The application provides a wireless charging system and a control method thereof. The control method comprises the following steps: when a battery pack is in a low power state, a transmitting end control module controls a power transmitting module to wirelessly transmit first preset power, i.e., auxiliary power, to a power receiving module; when the power receiving module receives the auxiliary power, the transmitting end control module controls a transmitting end wireless communication module and a receiving end wireless communication module to establish wireless communication; after the wireless communication is established, the transmitting end control module controls the power transmitting module to wirelessly transmit a first charging signal of second preset power to the power receiving module, so that the power receiving module charges the battery pack at a first preset current; and when it is determined that the battery pack returns to a normal charging state, the transmitting end control module controls the power transmitting module to wirelessly transmit a second charging signal of third preset power to the power receiving module, so that the power receiving module charges the battery pack at a second preset current.

Description

Technical Field

[0001] This invention relates to the field of wireless power transmission technology, and more specifically, to a wireless charging system and its control method. Background Technology

[0002] For Wireless Power Transmission (WPT) devices, the transmitter typically transmits power to the receiver, which then powers the battery pack. In some applications, wireless power transmission and communication do not occur simultaneously, resulting in discontinuous power transmission. In other applications, wireless power transmission and communication occur simultaneously, meaning the electromagnetic fields for power transmission and wireless communication are simultaneous and located in the same place. This ensures continuous power transmission; however, if wireless communication modules at the transmitter and receiver are not established, wireless power transmission cannot be initiated.

[0003] Normally, during the WPT (Wireless Power Transmission) process, the battery pack provides auxiliary power to the receiver to facilitate wireless communication between the receiver and transmitter. However, when the battery pack connected to the receiver is over-discharged and can no longer be discharged, the receiver will lose its auxiliary power supply capability. The receiver's controller and wireless communication module will then malfunction, preventing the WPT process from starting and thus hindering the transfer of energy from the transmitter to the receiver. Therefore, how to establish auxiliary power for the receiver to initiate a normal WPT process when the battery pack is over-discharged is a current challenge. Summary of the Invention

[0004] In view of this, the present invention provides a wireless charging system and its control method, which enables the establishment of auxiliary power supply for the receiver when the battery pack electrically connected to the receiver is over-discharged, so as to start normal wireless power transmission.

[0005] According to one aspect of the present invention, a control method for a wireless charging system is provided. The wireless charging system includes a transmitter and a receiver, wherein the transmitter includes a power transmission module, a transmitter control module, and a transmitter wireless communication module, and the receiver includes a power reception module, a receiver control module, and a receiver wireless communication module. The wireless charging system is used to provide power to a battery pack. The control method includes:

[0006] When the battery pack is in a depleted state, the transmitter control module controls the power transmitter module to wirelessly transmit a first preset power to the power receiver module, so that the power transmitter module outputs auxiliary power to the power receiver module.

[0007] When the power receiving module receives the auxiliary power, it controls the transmitting wireless communication module to establish wireless communication with the receiving wireless communication module.

[0008] Once the wireless communication is established, the transmitting end control module controls the power transmitting module to wirelessly transmit a first charging signal with a second preset power to the power receiving module, causing the power receiving module to charge the battery pack with a first preset current; and

[0009] The current working state of the battery pack is obtained and it is determined whether the battery pack has returned to normal charging state. When it is determined that the battery pack has returned to normal charging state, the transmitting end control module controls the power transmitting module to wirelessly transmit a second charging signal with a third preset power to the power receiving module, so that the power receiving module charges the battery pack with a second preset current.

[0010] Wherein, the first preset power is less than the second preset power; the second preset power is less than the third preset power; and the second preset current is greater than the first preset current.

[0011] Optionally, the control method further includes:

[0012] When it is determined that the battery pack has not returned to normal charging state, and the power receiving module charges the battery pack with a first preset current for a duration of a first preset time, it is determined that the battery pack is damaged, and the transmitting end control module controls the power transmitting module to stop transmitting the first charging signal.

[0013] Optionally, the wireless charging system further includes an external interface electrically connected to the transmitter control module; when the battery pack is in a depleted state, the control method further includes:

[0014] A preset operation is performed on the external interface so that the transmitter control module controls the power transmission module to wirelessly transmit the first preset power to the power receiving module.

[0015] Optionally, performing a preset operation on the external interface includes:

[0016] Performing a preset operation on the external interface based on a mechanical structure connected to the external interface; and / or sending preset information to the external interface, wherein the external interface is a communication interface; and / or performing a preset operation on the external interface based on a human-computer interaction device connected to the external interface.

[0017] Optionally, the transmitting end further includes a first NFC module, and the receiving end further includes a second NFC module; when it is determined that the battery pack is in a depleted state, the control method further includes:

[0018] Identity information is provided via the second NFC module;

[0019] The first NFC module is controlled to be in card reader mode, the identity information is read and the identity information is authenticated. If the authentication is successful, the receiver and the transmitter are determined to be compatible, and the transmitter control module controls the power transmission module to wirelessly transmit the first preset power to the power receiver module.

[0020] Optionally, after the power transmitting module is controlled by the transmitting end control module to wirelessly transmit a first preset power to the power receiving module, causing the power transmitting module to output auxiliary power, the control method further includes:

[0021] The transmitting end control module controls the first NFC module to switch its working mode to point-to-point mode, and the receiving end control module controls the second NFC module to switch its working mode to point-to-point mode, so that the first NFC module and the second NFC module establish wireless communication.

[0022] Optionally, obtaining the current operating state of the battery pack includes:

[0023] The current operating status of the battery pack is obtained through the receiving end control module.

[0024] Optionally, obtaining the current operating status of the battery pack through the receiving end control module includes:

[0025] The current operating status is obtained through the battery management system of the battery pack, and the current operating status is provided to the receiving control module.

[0026] Optionally, the receiving end control module and the battery pack are electrically coupled to a device controller; obtaining the current operating status of the battery pack through the receiving end control module includes:

[0027] The device controller detects the current operating status of the battery pack and provides the current operating status to the receiving control module.

[0028] Optionally, the step of controlling the transmitting wireless communication module to establish wireless communication with the receiving wireless communication module includes:

[0029] The receiving end control module controls the receiving end wireless communication module to establish wireless communication with the transmitting end wireless communication module; and

[0030] The transmitter control module controls the transmitter wireless communication module to establish wireless communication with the receiver wireless communication module.

[0031] Optionally, the receiver and the battery pack are mounted on a device to be charged.

[0032] According to another aspect of the present invention, a wireless charging system is provided for providing power to a battery pack. The wireless charging system includes a transmitter and a receiver. The transmitter includes a power transmitting module, a transmitter control module, and a transmitter wireless communication module. The receiver includes a power receiving module, a receiver control module, and a receiver wireless communication module. The transmitter control module is electrically connected between the power transmitting module and the transmitter wireless communication module. The receiver control module is electrically connected between the power receiving module and the receiver wireless communication module. The battery pack is electrically connected to the power receiving module.

[0033] The transmitting control module is configured to: control the power transmitting module to wirelessly transmit a first preset power to the power receiving module when the battery pack is in a depleted state, thereby establishing wireless communication between the transmitting and receiving wireless communication modules; and, after establishing wireless communication between the transmitting and receiving wireless communication modules, control the power transmitting module to wirelessly transmit a first charging signal of a second preset power to the power receiving module, thereby charging the battery pack with a first preset current; and when the battery pack returns to a normal charging state, control the power transmitting module to wirelessly transmit a second charging signal of a third preset power to the power receiving module, thereby charging the battery pack with a second preset current; wherein the first preset power is less than the second preset power; the second preset power is less than the third preset power; and the second preset current is greater than the first preset current.

[0034] Optionally, the transmitting end control module is further configured to control the power transmitting module to stop transmitting the first charging signal when the power receiving module charges the battery pack with the first preset current for a first preset time and the battery pack has not returned to normal charging state.

[0035] Optionally, the wireless charging system further includes an external interface electrically connected to the transmitter control module. After performing a preset operation on the external interface, the transmitter control module controls the power transmitting module to wirelessly transmit a first preset power to the power receiving module.

[0036] Optionally, performing a preset operation on the external interface includes: performing a preset operation on the external interface based on a mechanical structure connected to the external interface; and / or sending preset information to the external interface, wherein the external interface is a communication interface; and / or performing a preset operation on the external interface based on a human-computer interaction device connected to the external interface.

[0037] Optionally, the transmitting end further includes a first NFC module, and the receiving end further includes a second NFC module, the second NFC module being used to provide identity information when the battery pack is in a depleted state;

[0038] The first NFC module is used to operate in card reader mode when the battery pack is in a depleted state, read the identity information and authenticate the identity information, and when the authentication is successful, determine that the receiving end and the transmitting end are compatible, so that the transmitting end control module controls the power transmitting module to wirelessly transmit a first preset power to the power receiving module.

[0039] Optionally, the first NFC module is further configured to control the power transmitting module to wirelessly transmit a first preset power to the power receiving module under the control of the transmitting end control module, so that after the power transmitting module outputs auxiliary power, the working mode is switched to point-to-point mode and wireless communication is established with the second NFC module.

[0040] The second NFC module is also used to control the power transmitting module to wirelessly transmit a first preset power to the power receiving module under the control of the transmitting end control module, so that after the power transmitting module outputs auxiliary power, it switches the working mode to point-to-point mode and establishes wireless communication with the first NFC module.

[0041] Optionally, the receiving end control module is used to obtain the current operating state of the battery pack before determining whether the battery pack has returned to normal charging state.

[0042] Optionally, the receiving end control module obtains the current operating status of the battery pack through the battery management system of the battery pack.

[0043] Optionally, the receiving end control module and the battery pack are electrically coupled to a device controller, and the receiving end control module obtains the current working state through the device controller.

[0044] Optionally, the transmitting end control module is further configured to control the transmitting end wireless communication module to establish wireless communication with the receiving end wireless communication module; the receiving end control module is further configured to control the receiving end wireless communication module to establish wireless communication with the transmitting end wireless communication module.

[0045] Optionally, the receiver and the battery pack are mounted on a device to be charged.

[0046] The advantages of this invention compared to the prior art are as follows:

[0047] The wireless charging system and control method provided by this invention enable the establishment of auxiliary power supply for the receiver when the battery pack in the device to be charged is over-discharged, i.e., unable to establish auxiliary power supply for the receiver. This facilitates wireless communication between the receiver and the transmitter, enabling normal wireless power transmission between the transmitter and receiver, and allowing the battery pack in the device to be charged to be wirelessly charged. Attached Figure Description

[0048] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0049] Figure 1 This is a schematic diagram of the structure of a wireless charging system disclosed in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of a control method for a wireless charging system disclosed in an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of a control method for a wireless charging system disclosed in another embodiment of the present invention;

[0052] Figure 4 This is a schematic diagram of a control method for a wireless charging system disclosed in another embodiment of the present invention;

[0053] Figure 5 This is a schematic diagram of the structure of a wireless charging system disclosed in another embodiment of the present invention;

[0054] Figure 6 This is a schematic diagram of a control method for a wireless charging system disclosed in another embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram of a control method for a wireless charging system disclosed in another embodiment of the present invention;

[0056] Figure 8 This is a schematic diagram of the structure of a device to be charged in a wireless charging system disclosed in another embodiment of the present invention. Detailed Implementation

[0057] Example embodiments will now be described more fully with reference to the accompanying drawings. However, these example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of the specific details described, or other methods, materials, apparatus, etc., can be employed. In other instances, well-known technical solutions are not shown or described in detail to avoid obscuring aspects of this disclosure. The same reference numerals in the figures denote the same or similar structures, and therefore their detailed descriptions are omitted.

[0058] The terms “a,” “one,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “including,” “having,” and “have” are used to indicate an open-ended inclusion meaning and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0059] One embodiment of the present invention discloses a control method for a wireless charging system. For example... Figure 1 As shown, the wireless charging system includes a transmitter 1 and a receiver 2. The transmitter 1 includes a power transmitting module 11, a transmitter control module 12, and a transmitter wireless communication module 13. The receiver 2 includes a power receiving module 21, a receiver control module 22, and a receiver wireless communication module 23. The transmitter control module 12 is electrically connected between the power transmitting module 11 and the transmitter wireless communication module 13. The receiver control module 22 is electrically connected between the power receiving module 21 and the receiver wireless communication module 23. The power receiving module 21 is electrically connected to the battery pack 24. The wireless charging system can be used to provide power to the battery pack 24. Optionally, the battery pack 24 and the receiver 2 of the wireless charging system can be located in the device to be charged 25; that is, the power receiving module 21, the receiver control module 22, the receiver wireless communication module 23, and the battery pack 24 can all be located in the device to be charged 25. The power receiving module 21 is electrically connected to the battery pack 24 on the device to be charged 25. It can convert the received radio electromagnetic energy into electrical energy and transmit it to the battery pack 24 to achieve charging. At the same time, when the battery pack 24 is working, it can also provide auxiliary power to the receiver 2.

[0060] In this embodiment, as Figure 2 As shown, the control method applied to the above wireless charging system includes the following steps:

[0061] S110, when the battery pack 24 is in a low-power state, the transmitter control module 12 controls the power transmitter module 11 to wirelessly transmit the first preset power to the power receiver module 21, so that the power transmitter module 11 outputs auxiliary power to the power receiver module 21.

[0062] S120, when the power receiving module 21 receives auxiliary power, it controls the transmitting wireless communication module 13 to establish wireless communication with the receiving wireless communication module 23. Optionally, in a specific implementation, the receiving control module 22 controls the receiving wireless communication module 23 to establish wireless communication with the transmitting wireless communication module 13. The transmitting control module 12 controls the transmitting wireless communication module 13 to establish wireless communication with the receiving wireless communication module 23.

[0063] S130, after the wireless communication is established, the transmitting end control module 12 controls the power transmitting module 11 to wirelessly transmit the first charging signal of the second preset power to the power receiving module 21, so that the power receiving module 21 charges the battery pack 24 with the first preset current.

[0064] S140: Obtain the current operating state of battery pack 24 and determine whether battery pack 24 has returned to normal charging state; if so, proceed to step S150.

[0065] S150, after determining that the battery pack 24 has returned to normal charging state, the transmitter control module 12 controls the power transmitter module 11 to wirelessly transmit a second charging signal with a third preset power to the power receiver module 21, so that the power receiver module 21 charges the battery pack 24 with a second preset current.

[0066] The first preset power is less than the second preset power. The second preset power is less than the third preset power, and the second preset current is greater than the first preset current.

[0067] Specifically, when the battery pack 24 on the device to be charged 25 is in a depleted state, the transmitting control module 12 controls the power transmitting module 11 to wirelessly transmit a small amount of energy to the power receiving module 21, thereby establishing auxiliary power supply at the end where the device to be charged 25 is located. After the auxiliary power supply to the device to be charged 25 is established, that is, when the power receiving module 21 in the receiving end 2 receives the auxiliary power supply, the receiving end 2 establishes wireless communication with the transmitting end 1. Then the transmitting end 1 transmits slightly higher power wireless energy to the receiving end 2 and charges the battery pack 24 with a small first preset current value, causing the battery pack 24 of the device to be charged 25 to enter the "depleted battery recovery" mode.

[0068] The current operating state of the battery pack 24 is detected. When it is determined that the battery pack 24 has returned to a normal charging state, the battery pack 24 is charged with a larger second preset current.

[0069] In this way, this application enables the above-mentioned control method provided by this application to provide and establish auxiliary power supply for the receiver 2 when the battery pack 24, which is electrically connected to the wireless charging system, is over-discharged, that is, when the battery pack 24 is unable to establish auxiliary power supply for the receiver. This allows the receiver 2 to establish wireless communication with the transmitter 1, and enables normal wireless power transmission between the transmitter 1 and the receiver 2, thereby realizing wireless charging of the battery pack 24 on the device to be charged 25.

[0070] Optionally, such as Figure 3 As shown, the above control method also includes:

[0071] If the battery pack 24 does not return to normal charging state, then step S160 is executed: determine whether the power receiving module 21 has charged the battery pack 24 with the first preset current for a duration that has reached the first preset time.

[0072] When the battery pack 24 has not returned to normal charging state, and the power receiving module 21 charges the battery pack 24 with the first preset current for a period of time that reaches the first preset time, then step S170 is executed: it is determined that the battery pack 24 is damaged, and the transmitting end control module 12 controls the power transmitting module 11 to stop transmitting the first charging signal.

[0073] If the battery pack 24 does not return to normal charging state, and the power receiving module 21 charges the battery pack 24 with the first preset current for less than the first preset time, then step S140 is repeated.

[0074] Optionally, in Figure 1 and Figure 2 Based on the corresponding embodiments, such as Figure 4 As shown, in step S110, when it is determined that the battery pack 24 is in a depleted state, a preset operation is performed on the external interface electrically connected to the transmitter control module 12, so that the transmitter control module 12 controls the power transmission module 11 to wirelessly transmit the first preset power to the power receiving module 21. That is, after the preset operation is performed on the external interface electrically connected to the transmitter control module 12, the transmitter control module 12 is triggered to execute step S110, which controls the power transmission module 11 to wirelessly transmit the first preset power to the power receiving module 21. In other words, after the preset operation is performed on the external interface electrically connected to the transmitter control module 12, the transmitter control module 12 can know that the next task is to "enter a certain working state to restore the depleted battery", and thus begin to wirelessly transmit weak energy to the receiver 2 to enable the receiver 2 to establish auxiliary power supply.

[0075] The aforementioned preset operation performed on the external interface electrically connected to the transmitter control module 12 can be implemented through the following methods:

[0076] Performing a preset operation on the external interface based on a mechanical structure connected to the external interface (e.g., pressing a preset button continuously for a certain period of time); and / or sending preset information to the external interface, wherein the external interface is a communication interface (e.g., Ethernet, CAN-Bus, etc.); and / or performing a preset operation on the external interface based on a human-machine interaction device connected to the external interface. This application does not impose any limitations on this.

[0077] Optionally, such as Figure 5 As shown, the wireless charging system may also include multiple Near Field Communication (NFC) modules. Specifically, the transmitter 1 may also include a first NFC module 14, which may be electrically connected to the transmitter control module 12, for example. The receiver 2 may also include a second NFC module 26, which may be electrically connected to the receiver control module 22, for example. In step S110, when the battery pack 24 is in a depleted state, the second NFC module 26 operates in card emulator mode. The second NFC module 26 in card emulator mode does not require power and can provide its identity information. Figure 2 Based on the corresponding embodiments, such as Figure 6 As shown, in this embodiment, when the battery pack 24 is in a depleted state, step S110 further includes:

[0078] Identity information is provided through the second NFC module 26.

[0079] The first NFC module 14 is controlled to be in card reader mode, read the above identity information and authenticate the above identity information. If the authentication is successful, the transmitter control module 12 controls the power transmitter module 11 to wirelessly transmit the first preset power to the power receiver module 21, so that the power transmitter module 11 outputs auxiliary power to the power receiver module 21.

[0080] Specifically, if the identification is successful, it is determined that receiver 2 and transmitter 1 are compatible. Only when receiver 2 and transmitter 1 are compatible can transmitter control module 12 control the power transmission module 11 to wirelessly transmit a first preset power to power receiver module 21, so that power transmission module 11 outputs auxiliary power to power receiver module 21.

[0081] Optionally, in Figure 6 Based on the corresponding embodiments, such as Figure 7 As shown, step S120 may further include:

[0082] After the power receiving module 21 receives auxiliary power, it controls the first NFC module 14 to switch to point-to-point mode and the second NFC module 26 to switch to point-to-point mode, enabling wireless communication between the first NFC module 14 and the second NFC module 26. Once wireless communication is established between the first NFC module 14 and the second NFC module 26, the transmitting control module 12 controls the power transmitting module 11 to wirelessly transmit a first charging signal with a second preset power to the power receiving module 21, thereby initiating normal wireless power transmission between the transmitting end 1 and the receiving end 2.

[0083] Optionally, the first NFC module 14 and the transmitting wireless communication module 13 can be combined into one module; and / or, the second NFC module 26 and the receiving wireless communication module 23 can be combined into another module, which is not limited in this application. That is, the first NFC module 14 implements the function of the transmitting wireless communication module 13, and / or the second NFC module 26 implements the function of the receiving wireless communication module 23. In this case, near-field communication between the two NFC modules is used to realize wireless communication between the transmitting end and the receiving end.

[0084] Optionally, step S140 includes: obtaining the current working state of the battery pack 24 through the receiver control module 22, and determining whether the battery pack 24 has returned to normal charging state based on the current working state.

[0085] A specific implementation method for obtaining the current operating status of the battery pack 24 through the receiving end control module 22 can be as follows: the receiving end control module 22 obtains the current operating status of the battery pack 24 through the battery management system of the battery pack 24. Alternatively, as... Figure 8 As shown, the device to be charged 25 is also equipped with a device controller 27, and both the receiving end control module 22 and the battery pack 24 are electrically coupled to the device controller 27. The device controller 27 detects the current operating state of the battery pack 24 and provides the current operating state to the receiving end control module 22. The connection between the device controller 27 and the receiving end control module 22 can be a communication interface (such as CAN-Bus) or a general digital signal port. Correspondingly, the device controller 27 sends the detected current operating state of the battery pack 24 to the receiving end control module 22 of the receiving end 2, which can be achieved through a preset message in the communication interface or through a preset level state of the digital signal.

[0086] Optionally, it can also be determined whether the battery pack 24 has returned to normal charging state by detecting the operating voltage of the battery pack 24 through the receiver control module 22, and determining whether the operating voltage has returned to a preset value. If the operating voltage of the battery pack 24 returns to the preset value, it is determined that the battery pack 24 has returned to normal charging state.

[0087] The present invention also provides a wireless charging system for providing power to a battery pack 24 and which can be operated using the control methods described in the above embodiments. Detailed structural features and advantages of this wireless charging system can be found in the description of the above embodiments, and will not be repeated here.

[0088] In summary, the wireless charging system and control method of the present invention have at least the following advantages:

[0089] The wireless charging system and control method disclosed in this application enable the establishment of auxiliary power supply for the receiver when the battery pack electrically connected to the wireless charging system is over-discharged, i.e., when the battery pack cannot establish auxiliary power supply for the receiver. This facilitates wireless communication between the receiver and the transmitter, enabling normal wireless power transmission between the transmitter and the receiver to wirelessly charge the battery pack on the device to be charged.

[0090] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A control method for a wireless charging system, characterized in that, The wireless charging system includes a transmitter and a receiver. The transmitter includes a power transmission module, a transmitter control module, and a transmitter wireless communication module. The receiver includes a power receiving module, a receiver control module, and a receiver wireless communication module. The wireless charging system is used to provide power to a battery pack. The control method includes: When the battery pack is in a depleted state, the transmitter control module controls the power transmitter module to wirelessly transmit a first preset power to the power receiver module, so that the power transmitter module outputs auxiliary power to the power receiver module. When the power receiving module receives the auxiliary power, it controls the transmitting wireless communication module to establish wireless communication with the receiving wireless communication module. Once the wireless communication is established, the transmitting end control module controls the power transmitting module to wirelessly transmit a first charging signal with a second preset power to the power receiving module, causing the power receiving module to charge the battery pack with a first preset current; and The current working state of the battery pack is obtained and it is determined whether the battery pack has returned to normal charging state. When it is determined that the battery pack has returned to normal charging state, the transmitting end control module controls the power transmitting module to wirelessly transmit a second charging signal with a third preset power to the power receiving module, so that the power receiving module charges the battery pack with a second preset current. Wherein, the first preset power is less than the second preset power; the second preset power is less than the third preset power; and the second preset current is greater than the first preset current.

2. The control method for the wireless charging system as described in claim 1, characterized in that, The control method further includes: When it is determined that the battery pack has not returned to normal charging state, and the power receiving module charges the battery pack with a first preset current for a duration of a first preset time, it is determined that the battery pack is damaged, and the transmitting end control module controls the power transmitting module to stop transmitting the first charging signal.

3. The control method for the wireless charging system as described in claim 1, characterized in that, The wireless charging system further includes an external interface electrically connected to the transmitter control module; when the battery pack is in a depleted state, the control method further includes: A preset operation is performed on the external interface so that the transmitter control module controls the power transmission module to wirelessly transmit the first preset power to the power receiving module.

4. The control method for the wireless charging system as described in claim 3, characterized in that, The preset operation performed on the external interface includes: Performing a preset operation on the external interface based on a mechanical structure connected to the external interface; and / or sending preset information to the external interface, wherein the external interface is a communication interface; and / or performing a preset operation on the external interface based on a human-computer interaction device connected to the external interface.

5. The control method for the wireless charging system as described in claim 1, characterized in that, The transmitting end further includes a first NFC module, and the receiving end further includes a second NFC module; when it is determined that the battery pack is in a depleted state, the control method further includes: Identity information is provided via the second NFC module; The first NFC module is controlled to be in card reader mode, read the identity information and authenticate the identity information. If the authentication is successful, it is determined that the receiving end and the transmitting end are compatible, so that the transmitting end control module controls the power transmitting module to wirelessly transmit the first preset power to the power receiving module.

6. The control method for the wireless charging system as described in claim 5, characterized in that, After the transmitting end control module controls the power transmitting module to wirelessly transmit a first preset power to the power receiving module, causing the power transmitting module to output auxiliary power to the power receiving module, the control method further includes: The transmitting end control module controls the first NFC module to switch its working mode to point-to-point mode, and the receiving end control module controls the second NFC module to switch its working mode to point-to-point mode, so that the first NFC module and the second NFC module establish wireless communication.

7. The control method for the wireless charging system as described in claim 1, characterized in that, The step of obtaining the current operating status of the battery pack includes: The current operating status of the battery pack is obtained through the receiving end control module.

8. The control method for the wireless charging system as described in claim 7, characterized in that, The step of obtaining the current operating status of the battery pack through the receiving end control module includes: The current operating status is obtained through the battery management system of the battery pack, and the current operating status is provided to the receiving control module.

9. The control method for the wireless charging system as described in claim 7, characterized in that, The receiving end control module and the battery pack are electrically coupled to a device controller. The step of obtaining the current operating status of the battery pack through the receiving end control module includes: The device controller detects the current operating status of the battery pack and provides the current operating status to the receiving control module.

10. The control method for the wireless charging system as described in claim 1, characterized in that, The step of controlling the transmitting wireless communication module to establish wireless communication with the receiving wireless communication module includes: The receiving end control module controls the receiving end wireless communication module to establish wireless communication with the transmitting end wireless communication module; and The transmitter control module controls the transmitter wireless communication module to establish wireless communication with the receiver wireless communication module.

11. The control method for the wireless charging system as described in claim 1, characterized in that, The receiver and the battery pack are mounted on a device to be charged.

12. A wireless charging system for providing power to a battery pack, characterized in that, The wireless charging system includes a transmitter and a receiver. The transmitter includes a power transmitting module, a transmitter control module, and a transmitter wireless communication module. The receiver includes a power receiving module, a receiver control module, and a receiver wireless communication module. The transmitter control module is electrically connected between the power transmitting module and the transmitter wireless communication module. The receiver control module is electrically connected between the power receiving module and the receiver wireless communication module. The battery pack is electrically connected to the power receiving module. The transmitting control module is configured to: control the power transmitting module to wirelessly transmit a first preset power to the power receiving module when the battery pack is in a depleted state, thereby establishing wireless communication between the transmitting and receiving wireless communication modules; and, after establishing wireless communication between the transmitting and receiving wireless communication modules, control the power transmitting module to wirelessly transmit a first charging signal of a second preset power to the power receiving module, thereby charging the battery pack with a first preset current; and when the battery pack returns to a normal charging state, control the power transmitting module to wirelessly transmit a second charging signal of a third preset power to the power receiving module, thereby charging the battery pack with a second preset current; wherein the first preset power is less than the second preset power; the second preset power is less than the third preset power; and the second preset current is greater than the first preset current.

13. The wireless charging system as described in claim 12, characterized in that, The transmitter control module is further configured to control the power transmitter module to stop transmitting the first charging signal when the power receiver module charges the battery pack with a first preset current for a first preset time and the battery pack has not returned to normal charging state.

14. The wireless charging system as described in claim 12, characterized in that, The wireless charging system also includes an external interface, which is electrically connected to the transmitter control module. After performing a preset operation on the external interface, the transmitter control module controls the power transmitting module to wirelessly transmit a first preset power to the power receiving module.

15. The wireless charging system as described in claim 14, characterized in that, The preset operation performed on the external interface includes: performing the preset operation on the external interface based on a mechanical structure connected to the external interface; and / or sending preset information to the external interface, wherein the external interface is a communication interface; and / or performing the preset operation on the external interface based on a human-computer interaction device connected to the external interface.

16. The wireless charging system as described in claim 12, characterized in that, The transmitting end includes a first NFC module, and the receiving end includes a second NFC module. The second NFC module is used to provide identity information when the battery pack is in a depleted state. The first NFC module is used to operate in card reader mode when the battery pack is in a depleted state, read the identity information and authenticate the identity information, and when the authentication is successful, determine that the receiving end is compatible with the transmitting end, so that the transmitting end control module controls the power transmitting module to wirelessly transmit a first preset power to the power receiving module.

17. The wireless charging system as described in claim 16, characterized in that, The first NFC module is also used to control the power transmitting module to wirelessly transmit a first preset power to the power receiving module under the control of the transmitting end control module, so that after the power transmitting module outputs auxiliary power, it switches the working mode to point-to-point mode and establishes wireless communication with the second NFC module. The second NFC module is also used to control the power transmitting module to wirelessly transmit a first preset power to the power receiving module under the control of the transmitting end control module, so that after the power transmitting module outputs auxiliary power, it switches the working mode to point-to-point mode and establishes wireless communication with the first NFC module.

18. The wireless charging system as described in claim 12, characterized in that, The receiving end control module is used to obtain the current working state of the battery pack before determining whether the battery pack has returned to normal charging state.

19. The wireless charging system as described in claim 18, characterized in that, The receiving end control module obtains the current operating status of the battery pack through the battery management system of the battery pack.

20. The wireless charging system as described in claim 18, characterized in that, The receiving end control module and the battery pack are electrically coupled to a device controller, and the receiving end control module obtains the current working status through the device controller.

21. The wireless charging system as described in claim 12, characterized in that, The transmitting end control module is also used to control the transmitting end wireless communication module to establish wireless communication with the receiving end wireless communication module; the receiving end control module is also used to control the receiving end wireless communication module to establish wireless communication with the transmitting end wireless communication module.

22. The wireless charging system as described in claim 12, characterized in that, The receiver and the battery pack are mounted on a device to be charged.

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