Wireless charging method and wireless charging device

Abstract

The present application provides a wireless charging method for providing power to a power receiving device, including performing a wireless charging function and a wireless communication function, wherein the wireless charging function includes a first detection operation of transmitting a detection signal to detect the power receiving device, and the wireless communication function includes a second detection operation of detecting a wireless communication tag, wherein the first detection operation includes periodically transmitting a first group and a second group of detection signals each including a plurality of detection signals, and no other detection signals are transmitted between the operation of transmitting the first group of detection signals and the operation of transmitting the second group of detection signals, and the method performs the second detection operation between transmitting the first group of detection signals and transmitting the second group of detection signals. The present application also provides a wireless charging device for performing the wireless charging method.

Description

Technical Field

[0001] The present application relates to the field of wireless charging, and in particular, to a wireless charging method for providing power to a power receiving device and a wireless charging device for performing the wireless charging method. Background Art

[0002] After more than ten years of development, wireless charging technology has become increasingly mature and widely used, especially in-vehicle wireless charging, which is favored by more and more car manufacturers. However, as more and more car manufacturers use wireless communication tags, such as NFC cards (Near Field Communication cards), RFID tags (Radio Frequency Identification tags) or other electronic tags as car keys, in order to protect NFC cards such as car keys from being damaged by in-vehicle wireless charging devices, in-vehicle wireless charging devices are often required to have the function of detecting NFC cards.

[0003] In the current NFC application scenarios, power receiving devices with NFC functions (such as mobile phones) can simulate NFC cards. The application of such simulated cards frees up physical NFC cards. Therefore, the detection function of wireless charging devices for NFC cards should also include the differentiation between physical NFC cards and simulated cards. Currently, there are related technologies that can correctly distinguish between the two, avoiding the loss of wireless charging function due to simulated cards.

[0004] In addition, although some power receiving devices such as mobile phones have integrated the detection function of NFC cards, the cost of the power receiving device has been greatly increased, and if the mobile phone also integrates an analog card with NFC function, it may also affect the application of the analog card. Therefore, there are still a large number of power receiving devices on the market that do not have this function. Integrating the detection function of NFC cards into wireless charging devices is no longer limited by the type of power receiving devices, and can achieve effective detection and protection of wireless communication tags.

[0005] At present, the wireless charging function for the power receiving device and the wireless communication function for communicating with the wireless communication tag in the wireless charging device are both synchronized and parallel. Since the wireless charging function and the wireless communication function are coupled outside the function, relatively independent and have no information and status interaction, the detection timing for the wireless communication tag in the wireless communication function and the charging timing of the wireless charging function are not defined, and in space, the communication coil for the wireless communication function and the charging coil for the wireless charging function are parallel and overlapped, so there are the following defects:

[0006] (1) When wireless charging is in progress, strong electromagnetic interference will cause the detection of wireless communication tags to fail, making it impossible to determine whether there are wireless communication tags in the wireless charging field.

[0007] (2) Since there is no macroscopic order in the execution of the wireless charging function and the wireless communication function, and the timing of placing the wireless communication tag is random and completely asynchronous with the control logic, there is a blind spot in the detection of the wireless communication tag.

[0008] (3) If the wireless charging function is forcibly terminated to detect the wireless communication tag, the charging process will obviously be interrupted, seriously affecting the user experience.

[0009] As the output power of wireless charging increases from 5W to 15W, and will continue to increase to 40W and above in the future, the risk posed to wireless communication tags by the energy transmitted by the charging coil through the electromagnetic field will become increasingly greater.

[0010] Therefore, there is an urgent need for an improved wireless charging method and wireless charging device that can solve at least some problems in the current wireless charging technology. Summary of the invention

[0011] The purpose of this application is to solve the problem that wireless communication tags cannot be effectively detected and protected when performing wireless charging functions.

[0012] According to one aspect of the present application, a wireless charging method for providing power to a power receiving device is described, comprising: a wireless charging function, comprising a first detection operation of transmitting a detection signal to detect whether a power receiving device exists in a wireless charging field; a wireless communication function, comprising a second detection operation of detecting whether a wireless communication tag exists in the wireless charging field; wherein the first detection operation comprises periodically transmitting a first group of detection signals and periodically transmitting a second group of detection signals, wherein no other detection signals are transmitted between the operation of transmitting the first group of detection signals and the operation of transmitting the second group of detection signals, the first group of detection signals and the second group of detection signals respectively comprise a plurality of the detection signals, and the wireless charging method further comprises performing the second detection operation between transmitting the first group of detection signals and transmitting the second group of detection signals.

[0013] Optionally, according to some embodiments of the wireless charging method, the number of the detection signals included in the first group of detection signals is the same as the number of the detection signals included in the second group of detection signals.

[0014] Optionally, according to some embodiments of the wireless charging method, the number of the detection signals included in the first group of detection signals is different from the number of the detection signals included in the second group of detection signals.

[0015] Optionally, according to some embodiments of the wireless charging method, the wireless charging method includes performing the following operations: when the second detection operation detects the wireless communication tag, terminating the wireless charging function until the wireless communication tag is removed.

[0016] Optionally, according to some embodiments of the wireless charging method, the wireless charging function further includes: an identification operation, identifying the feedback information of the power receiving device in response to the detection signal and the status information of the wireless charging device; a registration operation, registering the power receiving device; and a charging operation, providing power to the power receiving device.

[0017] Optionally, according to some embodiments of the wireless charging method, when the first detection operation detects the power receiving device, the wireless charging method further includes performing the following operations: terminating the wireless charging function and performing the second detection operation; when the wireless communication tag is not detected, restarting the wireless charging function to perform the identification operation, the registration operation and the charging operation; and when the wireless communication tag is detected, continuously terminating the wireless charging function until the wireless communication tag is removed.

[0018] Optionally, according to some embodiments of the wireless charging method, when the first detection operation detects the power receiving device, the wireless charging method further includes performing the following operations: performing the identification operation to identify the first information; terminating the wireless charging function and performing the second detection operation; when the wireless communication tag is not detected in the wireless charging field, restarting the wireless charging function, and performing the identification operation to identify the second information; when the first information and the second information are the same, performing the registration operation and the charging operation; when the first information and the second information are different, terminating the wireless charging function and performing the second detection operation.

[0019] Optionally, according to some embodiments of the wireless charging method, the wireless charging function further includes: a third detection operation, detecting the state of the power receiving device during the period of providing power to the power receiving device, and determining whether the power receiving device has changed and / or the power receiving device has been removed based on the state of the power receiving device.

[0020] Optionally, according to some embodiments of the wireless charging method, when the third detection operation detects that the power receiving device has changed, the wireless charging method further includes performing the following operations: terminating the wireless charging function; and performing the second detection operation.

[0021] Optionally, according to some embodiments of the wireless charging method, when the third detection operation detects that the power receiving device is removed, the wireless charging method further includes performing the following operations: re-performing the first detection operation.

[0022] Optionally, according to some embodiments of the wireless charging method, the state of the power receiving device is at least one of the following items: the position of the power receiving device in the wireless charging field; the communication state of the power receiving device; the timing state of the power receiving device; and the charging efficiency of the power receiving device.

[0023] According to another aspect of the present application, a wireless charging device is described, comprising a power transmission unit, a wireless communication unit and a control unit, wherein the control unit is used to control the power transmission unit to perform a wireless charging function, and to control the wireless communication unit to perform a wireless communication function; wherein the wireless charging function comprises a first detection operation of transmitting a detection signal to detect whether a power receiving device exists in a wireless charging field; the wireless communication function comprises a second detection operation of detecting whether a wireless communication tag exists in the wireless charging field; the first detection operation comprises periodically transmitting a first group of detection signals and periodically transmitting a second group of detection signals, wherein no other detection signals are transmitted between the operation of transmitting the first group of detection signals and the operation of transmitting the second group of detection signals, and the first group of detection signals and the second group of detection signals respectively comprise a plurality of the detection signals; and the control unit controls the wireless communication unit to perform the second detection operation between controlling the power transmission unit to transmit the first group of detection signals and transmitting the second group of detection signals.

[0024] Optionally, according to some embodiments of the wireless charging device, when the wireless communication tag is detected in the second detection step, the control unit is used to control the power transmission unit to terminate the wireless charging function until the wireless communication tag is removed.

[0025] Optionally, according to some embodiments of the wireless charging device, the wireless charging function further includes: an identification operation, identifying, by the power transmission unit, feedback information of the power receiving device in response to the detection signal and status information of the wireless charging device; a registration operation, registering the power receiving device to the power transmission unit; and a charging operation, providing power to the power receiving device through the power transmission unit.

[0026] Optionally, according to some embodiments of the wireless charging device, when the first detection operation detects the power receiving device, the control unit is further used to: control the power transmission unit to suspend the wireless charging function, and control the wireless communication unit to perform the second detection operation; when the second detection operation does not detect the wireless communication tag, control the power transmission unit to restart the wireless charging function to perform the identification operation, the registration operation and the charging operation; and when the second detection operation detects the wireless communication tag, control the power transmission unit to continuously suspend the wireless charging function until the wireless communication tag is removed.

[0027] Optionally, according to some embodiments of the wireless charging device, when the first detection operation detects the power receiving device, the control unit is further used to: control the power transmission unit to perform the identification operation to identify the first information; control the power transmission unit to terminate the wireless charging function, and control the wireless communication unit to perform the second detection operation; when the second detection operation does not detect the wireless communication tag, control the power transmission unit to restart the wireless charging function and perform the identification operation to identify the second information; when the first information and the second information are the same, control the power transmission unit to perform the registration operation and the charging operation; when the first information and the second information are different, control the power transmission unit to terminate the wireless charging function, and control the wireless communication unit to perform the second detection operation.

[0028] Optionally, according to some embodiments of the wireless charging device, the wireless charging function further includes: a third detection operation, detecting the state of the power receiving device during the period of providing power to the power receiving device, and determining whether the power receiving device has changed and / or the power receiving device has been removed based on the state of the power receiving device.

[0029] Optionally, according to some embodiments of the wireless charging device, when the third detection operation detects that the power receiving device has changed, the control unit is used to: control the power transmission unit to terminate the wireless charging function, and control the wireless communication unit to perform the second detection operation.

[0030] Optionally, according to some embodiments of the wireless charging apparatus, when the third detection operation detects that the power receiving device is removed, the control unit is used to: control the power transmission unit to re-execute the first detection operation.

[0031] Optionally, according to some embodiments of the wireless charging apparatus, the state of the power receiving device is at least one of the following items: the position of the power receiving device in the wireless charging field; the communication state of the power receiving device; the timing state of the power receiving device; and the charging efficiency of the power receiving device.

[0032] The present invention redesigns the execution timing of the wireless charging function and the wireless communication function based on the existing software architecture to detect the presence of the wireless communication tag in the time gap (idle time) of the normal execution of the wireless charging function, and ensures that high-power transmission is started only after there is no wireless communication tag in the wireless charging field to charge the power receiving device. This effectively protects the wireless communication tag without reducing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0034] Figure 1 A timing diagram of a wireless charging method according to an embodiment of the present application is shown.

[0035] Figure 2 A timing diagram of a wireless charging method according to another embodiment of the present application is shown.

[0036] Figure 3 Shows Figure 2 The defects of wireless charging method.

[0037] Figure 4A A timing diagram of a wireless charging method according to another embodiment of the present application is shown.

[0038] Figure 4B Shows Figure 4A Flow chart of a wireless charging method.

[0039] Figure 4C Shows Figure 4A Flow chart of a wireless charging method.

[0040] Figure 5A A timing diagram of a wireless charging method according to another embodiment of the present application is shown.

[0041] Figure 5B Shows Figure 5A Flow chart of a wireless charging method.

[0042] Fig. 6A and Figure 6B A schematic diagram of a wireless charging device according to an embodiment of the present application is shown.

[0043] Figure 7Shows Fig. 6A and Figure 6B Structural block diagram of a wireless charging device. DETAILED DESCRIPTION

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0045] When introducing the elements / components / etc. described and / or illustrated herein, the terms "a", "an", "the", "said", and "at least one" are used to indicate that there are one or more elements / components / etc. The terms "comprising", "including", and "having" are used to indicate an open-ended inclusive meaning and mean that there may be additional elements / components / etc. in addition to the listed elements / components / etc. In addition, the terms "first", "second", etc. in the claims are used only as labels and are not numerical limitations of their objects.

[0046] The term "wireless charging function" used throughout this application includes a series of operations from detecting whether a power receiving device exists to wirelessly charging the power receiving device. For example, the wireless charging function may include a detection operation for detecting whether a power receiving device such as a mobile phone exists in a wireless charging field, an identification operation for identifying feedback information sent by the power receiving device after being awakened and the state logic of the wireless charging device, a registration operation for communication handshake between the power receiving device and the wireless charging device, and a charging operation for transmitting power to the power receiving device at high power. In addition, the term "terminating the wireless charging function" used throughout this application refers to no longer performing various operations in the wireless charging function, except for operations that have already been performed. For example, when the wireless charging function is terminated after the detection operation in the wireless charging function has been performed, the detection operation will no longer continue to be performed, and additional identification operations, registration operations, and charging operations will no longer be performed, but the detection operations that have already been performed will not be affected. In addition, the term "restarting the wireless charging function" used throughout this application refers to continuing to perform various operations in the wireless charging function as needed. For example, after the detection operation is performed, the wireless charging function is terminated, and then after the wireless charging function is restarted, if the detection operation that has been performed did not detect the power receiving device, the wireless charging function can continue to perform the detection operation after restarting; if the detection operation that has been performed has detected the power receiving device, the wireless charging function can continue to perform the original operation after the detection operation after restarting, such as performing identification, registration or charging operations; if the charging operation that has been performed detects a change in the state of the power receiving device and terminates the wireless charging function, the detection operation or identification operation can be re-executed after the wireless charging function is restarted.

[0047] The term "wireless communication function" used throughout this application includes a series of operations from detecting whether a wireless communication tag is present to communicating with the wireless communication tag. For example, the wireless communication function may include a detection operation for detecting whether a wireless communication tag such as an NFC card is present in a wireless charging field, and a communication operation for controlling a wireless communication unit to communicate with the wireless communication tag.

[0048] The core idea of ​​the present application is to decompose all relevant operations of the wireless charging function, and insert the execution of the wireless communication function (such as the operation of detecting wireless communication tags and the operation of communicating with wireless communication tags in the wireless communication function) during the gaps between the execution of various operations of the wireless charging function, so as to ensure that the wireless charging function is not allowed to start high-power energy transmission to charge the power receiving device until the wireless communication tag is detected in the wireless charging field.

[0049] Figure 1 FIG. 1 shows a timing diagram of a wireless charging method according to an embodiment of the present application. Figure 1As shown, during the standby period of the wireless charging device, the wireless charging device performs a detection step in the wireless charging function, that is, by periodically sending a detection signal to detect whether there is a power receiving device such as a mobile phone in the wireless charging field.

[0050] In some embodiments of the present application, the detection signal for detecting whether the power receiving device is present in the wireless charging field may be a digital Ping detection signal based on the Qi protocol. The duration of the digital Ping is usually more than 65 milliseconds and less than 70 milliseconds, so the duration of the digital Ping can provide energy to wake up the power receiving device. When the power receiving device is awakened, the power receiving device will transmit an ASK signal as feedback information to the wireless charging device, and the feedback information contains basic information of the power receiving device.

[0051] Specifically, Figure 1 As shown in , in the wireless charging method provided by the present application, the wireless charging device periodically transmits digital Ping at times t1, t3, t5, etc. to detect whether there is a power receiving device in the wireless charging field, and performs a detection operation of a wireless communication tag (such as an NFC card) between two adjacent operations of transmitting digital Ping (for example, at time t2 between time t1 and time t3, or at time t4 between time t3 and time t5). The operation of transmitting digital Ping performed at time t1 and time t3 is an operation of transmitting digital Ping twice adjacent to each other, that is, no other digital Ping is transmitted between time t1 and time t3. In this way, since the detection operation of the wireless communication tag is performed after each digital Ping is completely transmitted, it is possible to avoid the detection operation of the wireless communication tag being interfered by the transmitted digital Ping, resulting in invalid wireless communication tag detection.

[0052] Further Figure 1As shown, if the NFC card is detected in the wireless charging field during the wireless communication tag detection operation performed at time t7, the subsequent operation of the wireless charging function can be temporarily suspended. For example, the operation of transmitting the digital Ping to detect the power receiving device can be stopped, but the wireless communication tag detection operation is repeatedly performed at a certain time interval, such as the t8 period, until the NFC card is removed. During this period, the continued execution of the wireless charging function is always suspended. Only when the NFC card is removed, such as at time t9, the wireless charging function is restarted to continue to alternately perform the operation of transmitting the digital Ping and the wireless communication tag detection operation, as shown at time t9 to t11. After the transmitted digital Ping detects the power receiving device, for example, after the digital Ping transmitted at time t11 detects the power receiving device, the subsequent operation of the wireless charging function is performed, and then the high-power energy transmission is started in the subsequent t12 period to charge the detected power receiving device.

[0053] Although Figure 1 It is shown that after the power receiving device is detected at time t11, the charging operation is performed in the t12 period. However, it should be understood that other operations in the wireless charging function can also be performed from time t11 to the beginning of the t12 period. For example, as described above, the transmitted digital Ping can wake up the power receiving device, and after the power receiving device is awakened, it will transmit an ASK signal (feedback information) containing basic information of the power receiving device to the outside world. Therefore, from time t11 to time t12, the wireless charging function can further perform an identification operation for identifying information, which includes feedback information of the power receiving device and the state logic of the wireless charging device, and a registration operation for establishing a communication handshake between the power receiving device and the wireless charging device based on the identified information (including the feedback information and the state logic), and only after the power receiving device is registered with the wireless charging device, energy transmission is started in the t12 period to perform the charging operation.

[0054] However, with the development of multi-channel and multi-coil wireless charging technology, if a wireless communication tag detection operation is added in the interval between the digital Pings emitted by each charging coil, since the wireless communication tag detection operation always takes time, if no wireless communication tag is found, it will cause the cycle of transmitting the digital Ping to detect the power receiving device to be lengthened, which will affect the time for the wireless charging device to discover the power receiving device, directly affecting the user experience.

[0055] In this regard, compared with Figure 1 The scheme of alternately performing the power receiving device detection operation and the wireless communication tag detection operation is shown. Another embodiment of the present application provides a scheme of grouping the detection signals and performing the wireless communication tag detection operation within the time interval of two consecutive groups of detection signals, such as Figure 2 In the timing diagram of the wireless charging method according to another embodiment shown, a group of digital Pings are periodically transmitted at a certain time interval in time periods such as t1, t3, and t5 to detect whether there is a power receiving device in the wireless charging field, and a detection operation of a wireless communication tag (such as an NFC card) is performed between two adjacent operations of transmitting a group of digital Pings (for example, at time t2 between time period t1 and time period t3, or at time t4 between time period t3 and time period t5). For example, in time period t1, the wireless charging device performs the operation of transmitting digital Pings multiple times to transmit a group of digital Pings containing multiple digital Pings in time period t1, and in time period t3, the wireless charging device also performs the operation of transmitting digital Pings multiple times to transmit another group of digital Pings containing multiple digital Pings in time period t3. The operations of transmitting a group of digital Pings performed in time periods t1 and t3 are two adjacent transmission operations, that is, no other digital Pings are transmitted between time periods t1 and t3. In this way, the detection step of the wireless communication tag is performed only after the digital Ping is completely transmitted, which can avoid the detection operation of the wireless communication tag being interfered by the transmitted digital Ping and causing invalid wireless communication tag detection. In addition, since the detection operation of the wireless communication tag is interspersed between the operations of transmitting grouped digital Pings, the time it takes for the wireless charging device to discover the power receiving device can be shortened, avoiding the detection time interval of the wireless charging device being too long due to the insertion of the wireless communication tag detection.

[0056] In this embodiment, the number of digital Pings included in each group of digital Pings transmitted may be the same or different. For example, the number of digital Pings in the first group of digital Pings transmitted in the t1 period may be the same as the number of digital Pings in the second group of digital Pings transmitted in the t3 period, or the number of digital Pings in the first group of digital Pings transmitted in the t1 period may be different from the number of digital Pings in the second group of digital Pings transmitted in the t3 period. In addition, the number of digital Pings in each group of digital Pings may depend on the number of charging coils and / or the number of channels of the wireless charging device. For example, if the number of coils in each charging channel of the wireless charging device is 8, each group of digital Pings may include 8 digital Pings. For another example, if the wireless charging device includes two charging channels and the total number of charging coils is 18, each group of digital Pings may include 18 / 2=9 digital Pings. However, the number of digital Pings in multiple groups of digital Pings is not necessarily exactly the same, and the present application is not limited to this. The purpose of this application is to flexibly allocate the detection timing of the wireless charging device by grouping digital Pings, so as to avoid the degradation of user experience caused by the long wireless charging detection time interval due to the insertion of NFC detection.

[0057] Further Figure 2 As shown, for example, in the wireless communication tag detection operation performed at time t7, it is detected that the NFC card exists in the wireless charging field. At this time, the subsequent operation of the wireless charging function can be temporarily suspended. For example, the operation of transmitting a group of digital Pings to detect the power receiving device can no longer be continued, but the operation of communicating with the NFC card in the wireless communication function can be repeated in the subsequent t8 period to detect whether the NFC card exists in the wireless charging field. In addition, the continued execution of the wireless charging function can be always suspended before the wireless communication tag (NFC card) is removed. Only when the NFC card is removed, for example, in the t9 period, the wireless charging function is restarted to continue to alternately perform the operation of transmitting a group of digital Pings and the detection operation of the wireless communication tag, as shown in the period (or time) t9 to t11. After a digital Ping in the transmitted group of digital Pings detects the power receiving device, for example, after a digital Ping in the group of digital Pings transmitted in the t11 period detects the power receiving device, the charging operation of the wireless charging function is performed in the subsequent t12 period, that is, high-power energy transmission is started to charge the detected power receiving device. It should also be understood that other operations in the wireless charging function may also be performed during the time period from time t11 to time t12, such as the identification operation and registration operation described above.

[0058] However, Figure 2 The scheme of alternately performing the operation of transmitting group digital Ping and the operation of detecting wireless communication tags still has a detection blind spot of wireless communication tags. Figure 3 As shown, if the wireless communication tag detection operation performed at time t10 does not detect the NFC card, and then a group of digital Pings are transmitted during time period t11, if at this time a power receiving device such as a mobile phone and the NFC card are placed in the wireless charging field at the same time, then the digital Ping transmitted during time period t11 will detect the presence of the mobile phone, and then the subsequent wireless communication tag detection operation will no longer be performed, but the wireless charging function will be directly started to provide power to the mobile phone. At this time, the energy provided by the wireless charging device will damage the NFC card.

[0059] Figure 4A A timing diagram of a wireless charging method according to yet another embodiment of the present application is shown to avoid the detection blind area discussed above. Figure 4B Shows Figure 4A Flow chart of a wireless charging method.

[0060] Figure 4A The wireless charging method shown is Figure 2The difference of the wireless charging method shown is that after the power receiving device is detected by the transmitted digital Ping, the wireless charging function is not immediately started to directly supply power to the power receiving device, but the wireless charging function is temporarily suspended (that is, the transmission of energy to the power receiving device and other pre-operations required before the transmission of energy are suspended). After the wireless charging function is suspended, a wireless communication tag detection operation is additionally performed. When the wireless communication tag detection operation performed detects a wireless communication tag in the wireless charging field, the wireless charging function can be directly terminated, and other operations for communicating with the wireless communication tag can be performed instead. Additionally or alternatively, the wireless charging function can also be temporarily suspended, and information indicating that the wireless communication tag is detected is transmitted to the user so as to restart the suspended wireless charging function when the wireless communication tag is removed. When the wireless communication tag detection operation performed does not detect a wireless communication tag in the wireless charging field, the subsequent operation of the wireless charging function is started to supply power to the power receiving device.

[0061] Combination Figure 4A and Figure 4B The wireless charging method described herein starts at step S100. In step S100, an initialization operation of the wireless charging device is performed to perform state initialization, variable initialization, timing initialization and other operations of the wireless charging device.

[0062] Next, in step S102, the power receiving device detection operation and the wireless communication tag detection operation are periodically performed alternately. Figure 4A As shown in the time period (or time) t1 to t5 in step S102, a group of digital Pings is periodically transmitted to detect whether there is a power receiving device in the wireless charging field, and a wireless communication tag detection operation is performed between two consecutive operations of transmitting a group of digital Pings. If no power receiving device and wireless communication tag are detected in the power receiving device detection operation and the wireless communication tag detection operation performed in step S102, step S102 is continuously performed.

[0063] If a wireless communication tag is detected in step S102, step S104 is executed to suspend the wireless charging function, that is, the digital Ping is no longer transmitted, and then step S106 can be executed to communicate with the detected wireless communication tag. At this time, it is determined whether the wireless communication tag is removed. If the wireless communication tag is not removed, the wireless charging function is suspended and communication with the wireless communication tag is continued to monitor whether the wireless communication tag exists in the wireless charging field; if the wireless communication tag is removed, the wireless charging function is restarted and the process returns to step S102 to continue to periodically perform the power receiving device detection operation and the wireless communication tag detection operation alternately.

[0064] For example, in Figure 4A In the wireless charging field, when the NFC card is detected in the wireless communication tag detection operation performed at time t7, the subsequent operation of the wireless charging function is temporarily suspended (step S104). For example, the operation of transmitting a group of digital Pings to detect the power receiving device may no longer be performed, and the wireless communication tag detection operation is repeatedly performed by communicating with the wireless communication tag in the subsequent t8 period, waiting for the wireless communication tag (NFC card) to be removed, and before the NFC card is removed, the continued execution of the wireless charging function is always suspended. Only when the NFC card is removed, for example, in the t9 period, the wireless charging function is restarted to continue to alternately perform the operation of transmitting a group of digital Pings and the wireless communication tag detection operation (step S102).

[0065] If a power receiving device is detected in step S102, then the wireless charging function is temporarily suspended in step S108, and the detection operation of the wireless communication tag is performed again in step S110. When a wireless communication tag is detected in step S110, the process jumps to step S106, the wireless charging function is continuously suspended, and the wireless communication tag is communicated with to confirm whether the wireless communication tag is removed; when no wireless communication tag is detected in step S110, the wireless charging function is restarted in S112 to perform the subsequent operation of the wireless charging function, so as to charge the detected power receiving device in step S114.

[0066] For example, in Figure 4A In the embodiment, when a digital Ping in the group of digital Pings in the t11 period detects the power receiving device, at the subsequent t12 time, the execution of the wireless charging function is temporarily suspended (step S108), and the wireless communication tag detection operation is performed again (step S110). Only when no wireless communication tag is detected in the wireless communication tag detection operation performed at the t12 time, the wireless charging function is restarted in the subsequent t13 period (step S112) to perform the subsequent operation of the wireless charging function, thereby starting energy transmission to charge the power receiving device (step S114).

[0067] It should be noted that in some embodiments of the present application, after the wireless charging function is restarted in step S112, the wireless charging function can identify the feedback information sent by the power receiving device after being awakened and the state logic of the wireless charging device before energy transmission, and establish a communication handshake between the power receiving device and the wireless charging device based on the feedback information and / or the state logic, such as Figure 4CAfter the power receiving device is registered with the wireless charging device, the detected power receiving device is charged in step S114.

[0068] Figure 5A A timing diagram of a wireless charging method according to another embodiment of the present application is shown. Figure 5B Shows Figure 5A Flow chart of a wireless charging method.

[0069] in Figure 5B Steps S200, S202, S204, S206, S208, S210, S212 and S214 and Figure 4B Steps S100, S102, S104, S106, S108, S110, S112 and S114 are the same and will not be described in detail.

[0070] like Figure 5B As shown, after the power receiving device is detected in step S202 and before the wireless charging function is terminated in step S208, the first feedback information and the first state logic of the wireless charging device are identified in step S207 using the digital Ping transmitted by the wireless charging device after the power receiving device is awakened (the first feedback information and the first state logic are collectively referred to as the first information), and the first information may contain various data about the power receiving device. In addition, when the wireless communication tag is not detected in step S210 and the wireless charging function is restarted in step S212, the digital Ping is transmitted again in step S213, and the second feedback information of the power receiving device in response to the digital Ping and the second state logic of the wireless charging device are identified again based on the digital Ping (the second feedback information and the second state logic are collectively referred to as the second information). Then, the first information identified in step S207 and the second information identified in step S213 are compared, and only when the first information and the second information are consistent, the power receiving device is charged in step S214. Otherwise, if they are inconsistent, it can be considered that the power receiving device detected before and after the wireless communication tag detection operation performed in step S210 has changed. At this time, in order to further ensure that the wireless communication tag does not exist in the wireless charging field, return to step S207, replace the latest identified second information with the first information, and terminate the wireless charging function again to detect the wireless communication tag, that is, repeat steps S208 to S213.

[0071] For example, in Figure 5AIn the process, when a certain digital Ping in the group of digital Pings in the t11 period detects the power receiving device, the first information is identified (step S207). At the subsequent t12 moment, the execution of the wireless charging function is temporarily suspended (step S208), and the wireless communication tag detection operation is performed again (step S210). Only when the wireless communication tag is not detected in the wireless communication tag detection operation performed at the t12 moment, the wireless charging function is restarted in the subsequent t13 period (step S212), and the digital Ping is transmitted again to identify the second information (step S213), and then, the first signal identified at the t11 moment and the second signal identified at the t13 moment are compared. Only when the first signal and the second signal are consistent, the energy transmission is started at the t14 moment to charge the power receiving device (step S214).

[0072] Figure 5A and 5B Another benefit of the wireless charging method is that if the second information is not recognized in step S213, it is considered that the previously detected power receiving device is removed. At this time, the method returns to step S202 to re-alternately execute the power receiving device detection operation and the wireless communication tag detection operation, thereby avoiding false start of energy transmission.

[0073] According to some embodiments that can be combined with the embodiments of the present application, during the charging operation of the wireless charging function, the power receiving device can communicate with the wireless charging device, so that the power receiving device can send status data to the wireless charging device in real time, and the wireless charging device can determine the current charging state of the power receiving device based on the status data received from the power receiving device.

[0074] For example, according to some embodiments of the present application, the charging status data sent by the power receiving device may include the position of the power receiving device in the wireless charging field (i.e., the relative position of the power receiving device and the charging coil), the communication status between the power receiving device and the wireless charging device, the timing status between the power receiving device and the wireless charging device, and the power demand and charging efficiency of the power receiving device, etc., and the charging status may include a to-be-discovered state, a waiting-to-charge state, a charging state, an unchargeable state, a removed state, etc.

[0075] The detection operation for detecting the state data of the power receiving device based on the wireless charging function can enable the wireless charging device to switch between different charging states or maintain the current charging state, and determine the subsequent operation of the wireless charging function based on the current charging state.

[0076] For example, when Figure 5BAfter the wireless charging function is restarted in step 212, the charging state at this time can be defined as a waiting state. At this time, as discussed above, the wireless charging device can obtain the feedback information of the power receiving device and the state logic of the wireless charging device again, and compare the feedback information and the state logic with the previous feedback information and the previous state logic obtained before the wireless charging function is restarted. If the two are inconsistent, the charging state is switched to a unable to charge state; if the two are consistent, it is switched to a waiting to charge state; if no feedback information is received, it is switched to a removed state.

[0077] For example, if the current state is to be charged, the wireless charging function can obtain feedback information of the power receiving device, such as the communication state between the power receiving device and the wireless charging device and / or the timing state between the power receiving device and the wireless charging device, to determine whether the current power receiving device can be charged. If it can be charged, it switches to the charging state; if it cannot be charged, it switches to the unchargeable state.

[0078] For example, if the current state is charging, the wireless charging function can obtain feedback information of the power receiving device, such as the communication state between the power receiving device and the wireless charging device, and / or feedback information of the timing state between the power receiving device and the wireless charging device, to determine whether the current power receiving device can be charged. If the current power receiving device can be charged, the current state is maintained; if there is a power receiving device but it cannot be charged, it is switched to a state where it cannot be charged; if it cannot be charged and cannot communicate with the power receiving device, it is switched to a removed state.

[0079] For example, if the current state is that the charging cannot be performed, the wireless charging function can obtain feedback information from the power receiving device, such as the communication state between the power receiving device and the wireless charging device, the timing state between the power receiving device and the wireless charging device, and / or the position of the power receiving device in the wireless charging field, to determine the reason for the deterioration of charging quality. If it is because it is impossible to communicate with the power receiving device, it switches to the removed state; if the power receiving device can continue to charge, it switches to the charging state; if it is because the power receiving device changes and cannot be charged, it can return to the Figure 4B , Figure 4C Step S108 or Figure 5B Step S208 is performed to suspend the wireless charging function before charging the changed power receiving device, and a detection operation of the wireless communication tag is performed to ensure that the wireless communication tag does not exist in the wireless charging field before resuming charging.

[0080] For example, if the current state is removed, you can return Figure 4B , Figure 4C Step S102 or Figure 5BIn step S202, the power receiving device detection operation and the wireless communication tag detection operation are re-periodically and alternately performed.

[0081] The above describes a method for switching the charging state in real time according to the state of the power receiving device based on one charging channel. Optionally, when the wireless charging device has multiple charging channels, the states of the power receiving devices obtained by each charging channel can be integrated to perform the switching of the charging state.

[0082] Fig. 6A and Figure 6B A schematic diagram of a wireless charging device 10 according to an embodiment of the present application is shown. Figure 7 A structural block diagram of a wireless charging device 10 is shown.

[0083] exist Fig. 6A , Figure 6B and Figure 7 In the wireless charging device 10, a power transmission unit 110, a wireless communication unit 120 and a control unit 130 are coupled to the power transmission unit 110 and the wireless communication unit 120 respectively, and the control unit 130 can be used to control the power transmission unit 110 to perform the above-mentioned wireless charging function, and to control the wireless communication unit 120 to perform the above-mentioned wireless communication function. Among them, the power transmission unit 110 includes a charging coil 111, and can transmit a detection signal via the charging coil 111 to detect the presence of a power receiving device 20 (for example, a mobile phone) in the wireless charging field, and wirelessly transmit power to the receiving coil 21 of the power receiving device 20. The wireless communication unit 120 includes a communication coil 121, and the communication coil 121 can communicate with a wireless communication tag 30 (for example, an NFC card or an RFID card) in the charging field to detect the presence of the wireless communication tag 30 in the charging field. Specifically, the wireless communication tag 30 includes a communication coil 31, and the communication coil 121 of the wireless communication unit 120 can be magnetically coupled with the communication coil 31 of the wireless communication tag 30 to perform information transmission. The charging coil 111 and the communication coil 121 at least partially overlap, for example Fig. 6A As shown, the wireless charging device 10 has two charging coils 111 and one communication coil 121, and the communication coil 121 is placed above the charging coils 111 and overlaps with the two charging coils 111, or as shown in FIG. Figure 6B As shown, the wireless charging device 10 has two charging coils 111 and two communication coils 121 . Each of the two communication coils 121 is respectively placed above a corresponding charging coil 111 of the two charging coils 111 and overlaps with the corresponding charging coil 111 .

[0084] In some embodiments, the control unit 130 may have a processor and a memory storing instructions or programs, and when the processor executes the instructions or programs on the memory, the processor may control the power transmission unit 110 and the wireless communication unit 120 to perform specific operations.

[0085] According to some embodiments of the present application, the control unit 130 may control the power transmission unit 110 and the charging coil 111 of the power transmission unit 110 to perform the above combination. Figures 1 to 5B The various operations of the wireless charging function in the various wireless charging methods described, such as performing a detection operation of whether a power receiving device 20 such as a mobile phone is present in the wireless charging field, an identification operation of identifying feedback information sent after the power receiving device is awakened and information in the state logic of the wireless charging device, a registration operation of detecting a communication handshake between the power receiving device and the wireless charging device, a charging operation of transmitting power to the power receiving device at high power, a detection operation of obtaining the state of the power receiving device in real time, and an operation of switching the charging state according to the state of the power receiving device, etc., are not repeated here.

[0086] According to some embodiments of the present application, the control unit 130 may control the wireless communication unit 120 and the communication coil 121 of the wireless communication unit 120 to perform the above combination. Figures 1 to 5B Various operations of the wireless communication function in the various wireless charging methods described, such as performing detection operations such as controlling the wireless communication unit 120 and the wireless communication tag 30 to communicate to confirm whether the wireless communication tag is present in the wireless charging field, etc., are not repeated here.

[0087] In summary, the present application decomposes all relevant operations of the wireless charging function, and inserts the detection operation of the wireless communication tag during the intervals between the wireless charging function executing various operations, so as to ensure that the wireless charging function is not detected in the wireless charging field before allowing the wireless charging function to start high-power energy transmission to charge the power receiving device. In addition, the present application shortens the time for the wireless charging device to find the power receiving device and improves the user experience by performing wireless communication tag detection interspersed between the emission of grouped detection signals. In addition, after detecting the power receiving device, the present application does not immediately start the wireless charging function to directly supply power to the power receiving device, but temporarily suspends the wireless charging function and additionally performs the wireless communication tag detection operation. Only when the wireless communication tag detection operation performed does not detect the wireless communication tag in the wireless charging field, the wireless charging function is started to supply power to the power receiving device, thereby avoiding the blind spot of the wireless communication tag detection.

[0088] While the foregoing is directed to embodiments of the present disclosure, other and further embodiments of the disclosure may be devised without departing from the basic scope thereof, and the scope of the disclosure is determined by the claims that follow.

Claims

1. A wireless charging method for providing power to a power receiving device, comprising: The wireless charging function includes a first detection operation of transmitting a detection signal to detect whether a power receiving device exists in the wireless charging field, an identification operation of identifying feedback information of the power receiving device in response to the detection signal and status information of the wireless charging device, and a registration operation of registering the power receiving device; and a charging operation of supplying electric power to the power receiving device; The wireless communication function includes a second detection operation for detecting whether a wireless communication tag exists in the wireless charging field, wherein The first detection operation includes periodically transmitting a first group of detection signals and periodically transmitting a second group of detection signals, wherein no other detection signals are transmitted between the operation of transmitting the first group of detection signals and the operation of transmitting the second group of detection signals, and the first group of detection signals and the second group of detection signals respectively include a plurality of the detection signals, and The wireless charging method further comprises performing the second detection operation between transmitting the first group of detection signals and transmitting the second group of detection signals, wherein When the first detection operation detects the power receiving device, the wireless charging method further includes performing the following operations: Performing the identification operation to identify the first information; terminating the wireless charging function and performing the second detection operation; When the wireless communication tag is not detected in the wireless charging field, restarting the wireless charging function and performing the identification operation to identify second information; When the first information and the second information are the same, performing the registration operation and the charging operation; When the first information and the second information are different, the wireless charging function is terminated and the second detection operation is performed. 2 . The wireless charging method according to claim 1 , wherein the number of the detection signals included in the first group of detection signals is the same as the number of the detection signals included in the second group of detection signals.

3. The wireless charging method according to claim 1, wherein: The number of the detection signals included in the first group of detection signals is different from the number of the detection signals included in the second group of detection signals.

4. The wireless charging method according to claim 1, wherein the wireless charging method comprises performing the following operations: When the wireless communication tag is detected by the second detection operation performed between transmitting the first group of detection signals and transmitting the second group of detection signals, the wireless charging function is suspended until the wireless communication tag is removed.

5. The wireless charging method according to claim 1, wherein: The wireless charging function further includes: A third detection operation is to detect the state of the power receiving device during power supply to the power receiving device, and determine whether the power receiving device has been changed and / or removed according to the state of the power receiving device.

6. The wireless charging method according to claim 5, wherein: When the third detection operation detects that the power receiving device has changed, the wireless charging method further includes performing the following operations: terminating the wireless charging function; and The second detection operation is performed.

7. The wireless charging method according to claim 5, wherein when the third detection operation detects that the power receiving device is removed, the wireless charging method further comprises performing the following operations: The first detection operation is performed again.

8. The wireless charging method according to claim 5, wherein the state of the power receiving device is at least one of the following: the position of the power receiving device in the wireless charging field; a communication status of the power receiving device; The timing status of the power receiving device; and the charging efficiency of the power receiving device.

9. A wireless charging device, comprising a power transmission unit, a wireless communication unit and a control unit, wherein the control unit is used to control the power transmission unit to perform a wireless charging function and to control the wireless communication unit to perform a wireless communication function; wherein: The wireless charging function includes a first detection operation of transmitting a detection signal to detect whether a power receiving device exists in a wireless charging field, an identification operation of identifying feedback information of the power receiving device in response to the detection signal and status information of the wireless charging device through the power transmission unit, a registration operation of registering the power receiving device to the power transmission unit, and a charging operation of providing power to the power receiving device through the power transmission unit; The wireless communication function includes a second detection operation of detecting whether a wireless communication tag exists in the wireless charging field; The first detection operation includes periodically transmitting a first group of detection signals and periodically transmitting a second group of detection signals, wherein no other detection signals are transmitted between the operation of transmitting the first group of detection signals and the operation of transmitting the second group of detection signals, and the first group of detection signals and the second group of detection signals respectively include a plurality of the detection signals; and The control unit controls the wireless communication unit to perform the second detection operation between controlling the power transmission unit to transmit the first group of detection signals and transmitting the second group of detection signals, When the first detection operation detects the power receiving device, the control unit is further configured to: controlling the power transmission unit to perform the identification operation to identify first information; Controlling the power transmission unit to stop the wireless charging function, and controlling the wireless communication unit to perform the second detection operation; When the wireless communication tag is not detected by the second detection operation, controlling the power transmission unit to restart the wireless charging function and performing the identification operation to identify second information; When the first information and the second information are the same, controlling the power transmission unit to perform the registration operation and the charging operation; When the first information and the second information are different, the power transmission unit is controlled to suspend the wireless charging function, and the wireless communication unit is controlled to perform the second detection operation.

10. The wireless charging device according to claim 9, wherein When the wireless communication tag is detected by the second detection operation performed between transmitting the first group of detection signals and transmitting the second group of detection signals, the control unit is used to control the power transmission unit to suspend the wireless charging function until the wireless communication tag is removed.

11. The wireless charging device according to claim 9, wherein: The wireless charging function further includes: A third detection operation is to detect the state of the power receiving device during power supply to the power receiving device, and determine whether the power receiving device has been changed and / or removed according to the state of the power receiving device.

12. The wireless charging device according to claim 11, wherein: When the third detection operation detects that the power receiving device has changed, the control unit is configured to: The power transmission unit is controlled to suspend the wireless charging function, and the wireless communication unit is controlled to perform the second detection operation.

13. The wireless charging apparatus according to claim 11, wherein when the third detection operation detects that the power receiving device is removed, the control unit is configured to: The power transmission unit is controlled to re-perform the first detection operation.

14. The wireless charging apparatus according to claim 11, wherein the state of the power receiving device is at least one of the following: the position of the power receiving device in the wireless charging field; a communication status of the power receiving device; The timing status of the power receiving device; and the charging efficiency of the power receiving device.

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