Wireless charging system, clock synchronization method and device thereof, and electronic device

Abstract

The application provides a wireless charging system and a clock synchronization method, device and electronic equipment thereof, relates to the technical field of wireless charging, and is used for clock synchronization of wireless charging. The clock synchronization method comprises the following steps: adjusting the period of an original signal of a wireless charging transmitting device based on a preset period adjustment signal to obtain a composite signal, wherein the original signal comprises a fundamental wave signal and a modulation wave signal with different period values; obtaining average period values in a plurality of sampling periods based on the composite signal received by a wireless charging receiving device; and determining a sampling clock synchronization moment of the wireless charging receiving device according to the variation of the average period values in adjacent two sampling periods, wherein the sampling clock synchronization moment is a period variation moment of the fundamental wave signal and the modulation wave signal. The application can improve the transmission rate of a wireless transmission signal.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and in particular to a wireless charging system and its clock synchronization method, apparatus and electronic device. Background Technology

[0002] With the development of wireless charging technology, increasing the wireless transmission rate while keeping costs and power consumption within the existing limits has become a future trend.

[0003] In related technologies, the wireless charging transmitter sends signal waves to the wireless charging receiver for data exchange. To reduce errors and noise, the wireless charging receiver needs to collect a sufficient number of signal cycles and perform averaging. However, since the wireless charging communication protocol is an asynchronous communication method without clock synchronization, the sampling timing of the wireless charging receiver and the signal modulation timing of the wireless charging transmitter are inconsistent. This requires the wireless charging receiver to increase the number of samplings to improve data transmission accuracy, which increases the sampling time of the wireless charging receiver and affects the wireless charging data transmission rate.

[0004] While increasing the modulation depth of the transmitted signal and using auxiliary transmission methods such as Bluetooth can mitigate this, increasing the modulation depth affects wireless transmission power, reduces charging efficiency, and in severe cases, can lead to unbalanced charging power control. Using auxiliary transmission methods like Bluetooth increases cost and complexity.

[0005] Therefore, how to improve the wireless charging data transmission rate without affecting the charging transmission power or increasing costs is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] In view of this, the purpose of this application is to provide a wireless charging system and its clock synchronization method, device and electronic device, which can specifically solve the existing problems.

[0007] Based on the above objectives, in a first aspect, this application proposes a clock synchronization method for wireless charging, comprising: adjusting the period of an original signal from a wireless charging transmitting device based on a preset period adjustment signal to obtain a composite signal, wherein the original signal includes a fundamental wave signal and a modulation wave signal with different period values; obtaining an average period value within multiple sampling periods based on the composite signal received by a wireless charging receiving device; and determining a sampling clock synchronization time of the wireless charging receiving device based on the change in the average period value within two adjacent sampling periods, wherein the sampling clock synchronization time is the period change time of the fundamental wave signal and the modulation wave signal.

[0008] Optionally, the preset period adjustment signal includes a preset number of period value superposition amounts, the preset number being obtained based on the number of original signal periods contained in one sampling period, and each period value superposition amount matching one original signal period; adjusting the period of the original signal of the wireless charging transmitter based on the preset period adjustment signal includes: superimposing each period value superposition amount with its corresponding original signal period to obtain the composite signal; wherein, for the superimposed composite signal, its fundamental wave signal period average value within one sampling period is equal to the fundamental wave signal period average value of the original signal, and its modulation wave signal period average value within one sampling period is equal to the modulation wave signal period average value of the original signal.

[0009] Optionally, before adjusting the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal, the method includes: determining the superposition amount of the period value of the period adjustment signal according to an increasing or decreasing value selection method.

[0010] Optionally, determining the sampling clock synchronization time of the wireless charging receiving device based on the change in the average period value within two adjacent sampling periods includes: determining the moment when the change in the average period value within two adjacent sampling periods changes abruptly as the sampling clock synchronization time of the wireless charging receiving device.

[0011] Secondly, a clock synchronization device for wireless charging is also provided. The device includes: a period adjustment module for adjusting the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal to obtain a composite signal, wherein the original signal includes a fundamental wave signal and a modulation wave signal with different period values; a calculation module for obtaining an average period value within multiple sampling periods based on the composite signal received by the wireless charging receiver; and a clock synchronization module for determining the sampling clock synchronization time of the wireless charging receiver based on the change in the average period value within two adjacent sampling periods, wherein the sampling clock synchronization time is the period change time of the fundamental wave signal and the modulation wave signal.

[0012] Thirdly, a wireless charging system is also provided, the system comprising: a control unit, a wireless charging transmitter, and a wireless charging receiver; the control unit is configured to execute the clock synchronization method for wireless charging as described in any of the first aspects, and to control the wireless charging transmitter to transmit a composite signal; the wireless charging receiver is configured to receive the composite signal and demodulate the composite signal.

[0013] Optionally, the wireless charging transmitter includes: a cycle controller and a PWM generator; the cycle controller is connected to the control unit and the PWM generator through different interfaces respectively; the cycle controller is used to receive a cycle table sent by the control unit, the cycle table containing the period value of the composite signal; the cycle controller is used to send the period value of the composite signal to the PWM generator according to the cycle table; the PWM generator is used to issue a PWM control signal according to the period value of the composite signal.

[0014] Optionally, the cycle controller includes a cycle periodic table cache module, a cycle counter, and a parameter scheduler; the input of the cycle periodic table cache module is connected to the control unit, and the output of the cycle periodic table cache module is connected to the first terminal of the parameter scheduler; the cycle counter is connected to the second terminal of the parameter scheduler; the parameter scheduler sends the period value of the composite signal to the PWM generator through a third terminal, and the parameter scheduler receives the trigger signal sent by the PWM generator through a fourth terminal.

[0015] Optionally, the wireless charging receiving device includes: a clock synchronizer and a detector module; the clock synchronizer is used to send a reset signal to the detector module when a sampling clock synchronization moment is detected; the detector module is used to output an average period value based on the reset signal for signal demodulation.

[0016] Fourthly, an electronic device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method described in the first aspect.

[0017] Fifthly, a computer-readable storage medium is also provided, on which a computer program is stored, the program being executed by a processor to implement the method described in any one of the first aspects.

[0018] In summary, this application has at least the following beneficial effects:

[0019] The embodiments of this application adjust the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal to obtain a composite signal. Based on the composite signal received by the wireless charging receiver, the average period value within multiple sampling periods is obtained. According to the change in the average period value within two adjacent sampling periods, the sampling clock synchronization time of the wireless charging receiver is determined. By superimposing the period adjustment signal on the fundamental wave signal period and the modulation wave signal period of the TX device, the period value measured within a time period changes abruptly, thereby improving the period resolution capability of the RX device and enabling the RX device to achieve clock synchronization with the transmitter signal, thereby improving the FSK communication rate. Attached Figure Description

[0020] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0021] Figure 1 This diagram illustrates the periodic detection results provided in an embodiment of this application.

[0022] Figure 2 This illustrates another schematic diagram of the periodic detection results provided in an embodiment of this application;

[0023] Figure 3 This illustration shows a flowchart of the steps of a clock synchronization method for wireless charging provided in an embodiment of this application;

[0024] Figure 4 This illustration shows a schematic diagram of a raw signal and its period provided in an embodiment of this application;

[0025] Figure 5 This application provides a schematic diagram of a composite signal with superimposed periodic values ​​and its period, as illustrated in an embodiment of the present application.

[0026] Figure 6 This illustration shows a schematic diagram of a clock synchronization device for wireless charging provided in an embodiment of this application;

[0027] Figure 7 This diagram illustrates the structure of a wireless charging system according to an embodiment of this application.

[0028] Figure 8 This diagram illustrates the structure of a wireless charging transmitter according to an embodiment of this application.

[0029] Figure 9 This diagram illustrates the structure of a wireless charging receiver device according to an embodiment of this application.

[0030] Figure 10 This illustration shows a structural schematic diagram of an electronic device provided in an embodiment of this application;

[0031] Figure 11 A schematic diagram of a storage medium provided in one embodiment of this application is shown. Detailed Implementation

[0032] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the application. Furthermore, it should be noted that, for ease of description, only the parts relevant to the application are shown in the accompanying drawings.

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains.

[0035] Frequency-shift keying (FSK) is one of the earliest modulation methods used in information transmission. Because it is relatively easy to implement and has good noise and attenuation resistance, it has been widely used in medium and low speed data transmission.

[0036] In the field of wireless charging, continuous communication is required between the wireless power transmitter (TX device) and the wireless power receiver (RX device). The communication data sent from the TX device to the RX device generally uses FSK modulation. Since FSK communication can affect wireless power transmission, the FSK modulation depth needs to be as small as possible to reduce power loss. The FSK modulation depth is the difference between the fundamental frequency of the signal transmitted by the TX device and the frequency of the modulated signal. However, blindly increasing the FSK modulation depth will significantly reduce charging efficiency and, in severe cases, lead to imbalances in charging power control.

[0037] However, a smaller FSK modulation depth requires the RX device to have a higher resolution for the received frequency. Current RX devices generally use MCU cycle counting for frequency discrimination. The selection of the FSK modulation depth parameter in current wireless transmission protocols is designed based on the minimum resolution cycle of an MCU of approximately 32MHz. At this point, due to the small range of cycle variation, the resolution accuracy requirements for the RX device are high. Measurement errors and noise interference are difficult to avoid during wireless charging; therefore, a sufficient number of fundamental frequency cycles need to be measured, and the RX device's MCU needs to perform digital filtering or averaging to output an accurate FSK demodulated signal. Simultaneously, because the wireless charging communication protocol uses asynchronous communication without clock synchronization, the FSK modulation timing of the TX device and the sampling timing of the RX device are uncertain. The RX device struggles to capture and align the first frequency cycle change of the FSK. Therefore, the RX device often needs to continuously acquire, count, and process waveform data within a certain time window. The RX device typically needs to acquire a sufficient number of FSK cycles and calculate the average to avoid misjudgments, which limits further increases in FSK communication speed.

[0038] Since most existing wireless charging products include functions such as information exchange, power negotiation, and encryption authentication, involving a large amount of data, a failure to improve the FSK communication rate will degrade the user experience. Although some products use Bluetooth or other auxiliary data transmission methods to speed up data transmission, this also increases cost and complexity.

[0039] Therefore, how to improve the wireless charging data transmission rate without increasing power loss or cost while ensuring wireless data transmission performance is an urgent problem to be solved.

[0040] In view of the above problems, this application proposes a wireless charging system and its clock synchronization method, device and electronic device. By coupling a period adjustment signal on the basis of the fundamental wave signal and the modulation wave signal of the TX device, the RX device can realize clock synchronization with the signal of the transmitting end, thereby improving the period resolution capability of the RX device and improving the FSK communication rate.

[0041] In one embodiment of this application, the fundamental frequency corresponding to the fundamental signal is f. oP The corresponding fundamental period is T0, and the FSK modulation frequency is f. mod The corresponding modulation period is T1. The number of modulations in FSK communication is N, which means that N fundamental frequency periods are used as one modulation period (forming one bit). N is usually 512.

[0042] The MCU of the RX device distinguishes between the fundamental wave period T0 and the modulation wave period T1 by measuring the average period duration of a fixed number of wireless transmission signals. If the RX device's MCU samples once every modulation cycle, that is, the RX device calculates the average every N fundamental wave cycles, then the following result will be obtained: Figure 1 The periodic detection results are shown.

[0043] Figure 1 This diagram illustrates the periodic detection results provided in an embodiment of this application. Figure 1 Taking N=6 as an example, such as Figure 1 As shown, the first row represents the period of the fundamental and modulated signals transmitted by the TX device; the second row represents the average period calculated by the RX device when the clocks of the RX and TX devices are synchronized; and the third row represents the average period calculated by the RX device when the clocks of the RX and TX devices are not synchronized.

[0044] The frequency switching time of the TX device's transmitted signal is the time when the fundamental wave period and the modulation wave period change, with the period value changing from T0 to T1, as referenced. Figure 1 When the frequency switching time of the TX device's transmission signal is synchronized with the clock time of the RX device's acquisition, the RX device can accurately calculate and distinguish the mean values. In this case, the mean value of the fundamental period is T0, and the mean value of the modulation period is T1. When the frequency switching time of the TX device's transmission signal is not synchronized with the clock time of the RX device's acquisition, the mean value calculated by the RX device is... Between T0 and T1, and with all the mean values ​​being equal, it is impossible to distinguish between the fundamental period and the modulation period.

[0045] Figure 2 This illustration shows another schematic diagram of the period detection result provided in an embodiment of this application. When the MCU of the RX device acquires data twice every one modulation cycle, that is, the RX device calculates the average value once every N / 2 fundamental frequency cycles, the result will be as follows: Figure 2 The periodic detection results are shown.

[0046] like Figure 2 As shown, the first row represents the period of the fundamental and modulated wave signals transmitted by the TX device; the second row represents the average period calculated by the RX device when the clocks of the RX and TX devices are synchronized; the third row represents the average period calculated by the RX device when the clock of the RX device lags behind the clock of the TX device; and the fourth row represents the average period calculated by the RX device when the clock of the RX device leads the clock of the TX device.

[0047] refer to Figure 2When the frequency switching time of the TX device's transmission signal is synchronized with the clock time of the RX device's acquisition, the RX device can accurately calculate and distinguish the mean values. In this case, the mean value of the fundamental period is T0, and the mean value of the modulation period is T1. When the frequency switching time of the TX device's transmission signal is not synchronized with the clock time of the RX device's acquisition, and the frequency switching time of the TX device's transmission signal falls within the sampling time period of the RX device, the mean value calculated by the RX device is... or Between T0 and T1, when the frequency switching time of the TX device's transmitted signal does not fall within the sampling time period of the RX device, the RX device can distinguish between the fundamental wave period and the modulation wave period.

[0048] Depend on Figure 1 and Figure 2 It is known that the RX device needs to change the number of acquisitions within one modulation cycle and acquire more cycle data in order to determine the average cycle duration within a certain time period, which will affect the FSK communication rate between the RX device and the TX device.

[0049] The wireless charging system and clock synchronization method provided in this embodiment aim to reduce the number of periodic acquisitions by the RX device. By superimposing a periodic adjustment signal on the fundamental wave signal period and the modulation wave signal period of the TX device, a sudden change in the measured period value occurs within a time period, thereby improving the period resolution capability of the RX device. This enables the RX device to achieve clock synchronization with the transmitting end signal, thereby improving the FSK communication rate.

[0050] The clock synchronization method provided in this application embodiment is applicable to all scenarios using FSK, or other wireless communication application scenarios. For ease of explanation, this embodiment takes the wireless charging field, which involves data interaction between a wireless power transmitter and a wireless power receiver, as an example.

[0051] The embodiments of this application are described in detail below.

[0052] Example 1

[0053] Figure 3 This illustration shows a flowchart of a clock synchronization method for wireless charging provided in an embodiment of this application. The clock synchronization method for wireless charging in this embodiment of the application can be executed by a controller, MCU, or integrated circuit chip with processing functions.

[0054] Please refer to Figure 3 The clock synchronization method for wireless charging provided in this application includes the following steps S301 to S303:

[0055] S301. Adjust the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal to obtain a composite signal.

[0056] In the embodiments of this application, the original signal includes a fundamental wave signal and a modulated wave signal with different period values, such as... Figure 2 The period of the fundamental wave signal is T0, and the period of the modulated wave signal is T1.

[0057] It is understandable that, in order not to affect the signal recognition of the RX device, the adjusted composite signal still needs to meet the wireless charging Qi protocol specification. Therefore, in the embodiments of this application, the period adjustment signal needs to be set within a preset range so that the average period of the adjusted composite signal remains unchanged.

[0058] In this embodiment of the application, the preset period adjustment signal includes a preset number of period value superpositions. The preset number is obtained based on the number of original signal periods contained in a sampling period, and each period value superposition is matched with an original signal period.

[0059] In this embodiment of the application, a sampling period can be one modulation period, that is, a sampling period contains N fundamental frequency periods. Then, the number of period values ​​superimposed in a period adjustment signal includes N. When the original signal is a fundamental frequency signal, N period values ​​superimposed that match the N fundamental frequency periods can be obtained. When the original signal is a modulation frequency signal, N period values ​​superimposed that match the N modulation frequency periods can be obtained.

[0060] It should be noted that, in order to comply with the Qi wireless charging protocol specification and not affect the signal recognition of the RX device, the period value superposition amount in this embodiment is kept as small as possible. This allows for fine-tuning of the period value of the original signal to obtain the adjusted composite signal. In one example, a larger period value superposition amount makes it easier for the RX device to recognize the signal. The specific period value superposition amount can be calculated based on the core frequency of the RX device's MCU to ensure that the composite signal can be recognized by the RX device while achieving clock alignment. Since different MCUs have different frequencies, the period value superposition amount is not unique and can vary with the core frequency of the MCU.

[0061] In this embodiment of the application, the period of the original signal of the wireless charging transmitter is adjusted based on a preset period adjustment signal, including: superimposing each period value with its corresponding original signal period to obtain a composite signal, wherein, for the composite signal, the average value of the fundamental wave signal period within one sampling period is equal to the average value of the fundamental wave signal period of the original signal, and the average value of the modulation wave signal period within one sampling period is equal to the average value of the modulation wave signal period of the original signal.

[0062] The clock synchronization method for wireless charging provided in this application embodiment is achieved by fine-tuning the original signal without changing the average value of the original signal period. Although the average period value of the adjusted composite signal remains unchanged, its extreme values ​​and variance change. These extreme values ​​and variance affect the signal recognition stability of the RX device. Therefore, to improve the recognition stability of the composite signal by the RX device, this embodiment further includes, before adjusting the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal, determining the superposition amount of the period value of the period adjustment signal according to an increasing or decreasing value selection method. This ensures that the superposition amounts of adjacent period values ​​of the period adjustment signal have the same numerical variation pattern, and also improves the transmission stability of the composite signal after coupling the period adjustment signal.

[0063] The incrementing or decrementing methods include, but are not limited to, linear or discrete methods. For example, using a linear method, multiple periodic values ​​with a linear relationship can be superimposed, facilitating development and design. Similarly, using a parabolic method, multiple parabolic periodic values ​​can be superimposed, resulting in a smaller variance in the average periodic value of the adjusted composite signal and better compatibility with RX devices. Another example is taking several discrete values ​​that satisfy incrementing or decrementing rules without a functional pattern.

[0064] In one example, the superposition of period values ​​can be represented as "-x...-2, -1, +1, +2...+x", and the fundamental wave period obtained based on this superposition can be represented as "T0-x", "T0-2", "T0-1", "T0+1", "T0+2", "T0+x". Similarly, the modulation wave period can be represented as "T1-x", "T1-2", "T1-1", "T1+1", "T1+2", "T1+x".

[0065] S302. Based on the composite signal received by the wireless charging receiver, obtain the average period value within multiple sampling periods.

[0066] The sampling period in this embodiment can be the modulation period described above, that is, one sampling period includes N fundamental wave signals with a period of T0 or N modulated wave signals with a period of T1.

[0067] S303. Determine the sampling clock synchronization time of the wireless charging receiver based on the change in the average period value within two adjacent sampling periods.

[0068] In this embodiment, determining the sampling clock synchronization time of the wireless charging receiver based on the change in the average period value within two adjacent sampling periods includes: determining the moment when the change in the average period value within two adjacent sampling periods abruptly occurs as the sampling clock synchronization time of the wireless charging receiver. The sampling clock synchronization time is the time of periodic change of the fundamental wave signal and the modulated wave signal.

[0069] To better illustrate the embodiments of this application, a comparative example is given below. Figure 4 This application provides a schematic diagram of a raw signal and its period, as shown in the embodiments of the present application. Figure 5 A schematic diagram of a composite signal with superimposed periodic values ​​and its period provided in an embodiment of this application.

[0070] like Figure 4 The FSK original signal shown includes a fundamental frequency signal and a modulating frequency signal. Within one modulation period, it contains N fundamental frequency signals with a period of T0, and within one modulation period, it contains N modulating frequency signals with a period of T1. The fundamental frequency is f... op The frequency of the modulated wave is f mod It can be seen that the period values ​​corresponding to different frequencies are also different, that is, T0 and T1 are different.

[0071] like Figure 5 The period of the composite signal shown is relative to Figure 4 The period time of the original signal changes, and the period time of the composite signal is based on the period time of the original signal by adding a period value. In this embodiment, taking N=4 as an example, the period values ​​of the four fundamental wave periods in the original signal are T0, T0, T0, T0, and the period values ​​of the four modulating wave periods are T1, T1, T1, T1, T1, while the period values ​​of the four fundamental wave periods in the composite signal are "T0-2", "T0-1", "T0+1", "T0+2", and the period values ​​of the four modulating wave periods are "T1-2", "T1-1", "T1+1", "T1+2".

[0072] In the embodiments of this application, assuming the RX device cannot align with the clock and the initial acquisition period is "T0+2", the four acquired period values ​​are "T0+2", "T1-2", "T1-1", and "T1+1" respectively. The average value of these four periods is... Assuming the initial data collection period is "T1-2", the four collected period values ​​are "T1-2", "T1-1", "T1+1", and "T1+2", with the average of these four periods being T1. Assuming the initial data collection period is "T1-1", the four collected period values ​​are "T1-1", "T1+1", "T1+2", and "T0-2", with the average of these four periods being T1. Therefore, it can be concluded that the average value collected will change from The sudden change at T1, which is the moment when the fundamental period and the modulation period change, allows the MCU of the RX device to accurately determine the moment of this "period value change". This moment can be used as the sampling clock synchronization moment, and the sampling clock synchronization moment of the RX device can be aligned in terms of clock and phase.

[0073] In another example, the sampling clock synchronization time can also be determined based on the amount of change in each cycle. For example, if the collected cycle values ​​are “T0+2”, “T1-2”, “T1-1”, “T1+1”, “T1+2”, and “T0-2”, then the change between two adjacent cycles is 1, while the change from “T0+2” to “T0-2” is 4. That is, the change from “T0+2” to “T0-2” can be considered as one sampling cycle. Therefore, the change time between “T0+2” and “T1-2”, or the change time between “T1+2” and “T0-2”, can be regarded as the moment of abrupt change in the amount of change, and thus the sampling clock synchronization time can be obtained.

[0074] In the embodiments of this application, the average value of “T0-2”, “T0-1”, “T0+1”, and “T0+2” is still T0, and the average value of “T1-2”, “T1-1”, “T1+1”, and “T1+2” is still T1. On a larger time scale of a modulation period, the periodic mean of the FSK signal remains unchanged, and the FSK frequency does not change. Therefore, it can still comply with the Qi protocol specification and does not affect the recognition of the original RX device, demonstrating high compatibility.

[0075] The above is a clock synchronization method for wireless charging provided in this embodiment. The period of the original signal of the wireless charging transmitting device is adjusted based on a preset period adjustment signal to obtain a composite signal. Based on the composite signal received by the wireless charging receiving device, the average period value within multiple sampling periods is obtained. The sampling clock synchronization time of the wireless charging receiving device is determined according to the change in the average period value within two adjacent sampling periods. By superimposing the period adjustment signal on the fundamental wave signal period and the modulation wave signal period of the TX device, the period value measured within a time period changes abruptly, thereby improving the period resolution capability of the RX device and enabling the RX device to achieve clock synchronization with the transmitting end signal, thereby improving the FSK communication rate.

[0076] Example 2

[0077] Based on the same concept as the clock synchronization method for wireless charging described above, this embodiment also provides a clock synchronization device for wireless charging, referencing... Figure 6 The clock synchronization device 600 for wireless charging includes:

[0078] The period adjustment module 601 is used to adjust the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal to obtain a composite signal, wherein the original signal includes a fundamental wave signal and a modulated wave signal with different period values.

[0079] The calculation module 602 is used to obtain the average period value over multiple sampling periods based on the composite signal received by the wireless charging receiving device.

[0080] The clock synchronization module 603 is used to determine the sampling clock synchronization time of the wireless charging receiving device based on the change in the average period value within two adjacent sampling periods. The sampling clock synchronization time is the period change time of the fundamental wave signal and the modulation wave signal.

[0081] In an optional example, the preset period adjustment signal includes a preset number of period value superpositions, the preset number being obtained based on the number of original signal periods contained in one sampling period, with each period value superposition matching one original signal period. The period adjustment module 601 is further configured to superimpose each period value superposition with its corresponding original signal period to obtain the composite signal; wherein, for the superimposed composite signal, its fundamental signal period average value within one sampling period is equal to the fundamental signal period average value of the original signal, and its modulation wave signal period average value within one sampling period is equal to the modulation wave signal period average value of the original signal.

[0082] In an optional example, the period adjustment module 601 is further configured to determine the amount of period value superposition of the period adjustment signal according to an incrementing or decrementing method before adjusting the period of the original signal of the wireless charging transmitter based on the preset period adjustment signal.

[0083] In an optional example, the clock synchronization module 603 is further configured to determine the moment when the change in the average period value within two adjacent sampling periods abruptly occurs as the sampling clock synchronization moment of the wireless charging receiver.

[0084] The clock synchronization device for wireless charging provided in this embodiment is based on the same concept as the clock synchronization method for wireless charging described above. Therefore, it can at least achieve the beneficial effects that the clock synchronization method for wireless charging described above can achieve. Furthermore, any implementation of the clock synchronization method for wireless charging described above can be applied to the wireless charging device provided in this embodiment, and will not be described in detail here.

[0085] Example 3

[0086] Based on the same concept as the clock synchronization method for wireless charging described above, this embodiment also provides a wireless charging system, referencing... Figure 7The wireless charging system 700 of this embodiment includes: a control unit 701, a wireless charging transmitter 702, and a wireless charging receiver 703.

[0087] The control unit 701 is used to execute the clock synchronization method for wireless charging described above, and to control the wireless charging transmitter 702 to send a composite signal. The wireless charging receiver 703 is used to receive the composite signal and demodulate the composite signal.

[0088] Figure 8 A schematic diagram of a wireless charging transmitter is shown, such as... Figure 8 As shown, the wireless charging transmitter includes a cycle controller and a PWM generator. The cycle controller is connected to the control unit and the PWM generator through different interfaces. The cycle controller is used to receive the cycle table sent by the control unit. The cycle controller is used to send the period value of the composite signal to the PWM generator according to the cycle table. The PWM generator is used to issue a PWM control signal according to the period value of the composite signal.

[0089] In this embodiment, the cycle period table includes the period value of the composite signal. The composite signal is the composite signal obtained by adjusting the period of the original signal of the wireless charging transmitter based on the preset period adjustment signal in Embodiment 1.

[0090] In this embodiment of the application, the cycle table is shown in Table 1:

[0091] 0 <![CDATA[T0-x]]> <![CDATA[T1-x]]> 1 <![CDATA[T0-(x-1)]]> <![CDATA[T1-(x-1)]]> …… …… …… n-2 <![CDATA[T0+(x-1)]]> <![CDATA[T1+(x-1) <!-- 8 -->]]> n-1 <![CDATA[T0+x]]> <![CDATA[T1+x]]>

[0092] The cycle count values ​​range from 0 to n-1, with a total of n values. The value of n can be determined based on the value of N. For example, if a modulation cycle consists of 512 fundamental cycles, n can be a common divisor of 512, such as 8, 16, or 32. x can be calculated based on the core frequency of the MCU in the RX device.

[0093] It is understandable that the period value of the fine-tuned composite signal is constantly changing. If the PWM generator of the existing RX device is used to generate the PWM signal, the MCU of the RX device needs to be constantly adjusted, which consumes a lot of resources. Therefore, the wireless charging transmitter proposed in this embodiment includes a periodic loop controller.

[0094] refer to Figure 8 The cycle controller in this embodiment includes a cycle periodic table cache module, a cycle counter, and a parameter scheduler. The input of the cycle periodic table cache module is connected to the control unit, the output of the cycle periodic table cache module is connected to the first terminal of the parameter scheduler, the cycle counter is connected to the second terminal of the parameter scheduler, the parameter scheduler sends the period value of the composite signal to the PWM generator through the third terminal, and the parameter scheduler receives the trigger signal sent by the PWM generator through the fourth terminal.

[0095] In the embodiments of this application, the PWM generator includes a PWM period register, a PWM output unit, and a clock counter. The parameter scheduler sends the period value of the composite signal to the PWM period register through a third terminal, and the PWM output unit sends a trigger signal to the clock counter and the parameter scheduler, and outputs a PWM waveform.

[0096] In the wireless charging transmitter device of this embodiment, after the cycle table buffer module stores the input cycle table, the parameter scheduler reads the cycle table. Each time the PWM output unit outputs a PWM signal, it generates a trigger signal and sends the trigger signal to the parameter scheduler. Each time the parameter scheduler receives a trigger signal, it increments the cycle count value of the cycle counter by 1 and looks up the corresponding cycle value in the cycle table according to the current cycle count value. The parameter scheduler outputs the cycle value to the PWM cycle register. The PWM output unit compares the clock counter with the value of the PWM cycle register. When the two values ​​are equal, it outputs a PWM signal and generates a trigger signal to reset the clock counter, thereby controlling the next PWM cycle. This cycle repeats, and a stable PWM signal can be output. The frequency of the output PWM signal is the clock source frequency divided by the parameter value of the PWM cycle register. Thus, frequency modulation can be achieved by modifying the value of the PWM cycle register, and further, FSK control can be realized.

[0097] It is understood that the cycle table cache module and cycle counter in this embodiment can be implemented using the hardware or software design of the MCU of the RX device itself, while the parameter scheduler can use the MCU's DMA peripheral. The cycle counter stores the data address corresponding to the cycle table, and the DMA directly moves the data at the corresponding address to the PWM cycle register of the PWM generator. This does not increase hardware costs, is highly efficient and convenient, and saves software resources.

[0098] In one example, the aforementioned cycle controller can also be implemented using a digital logic unit with hardware handling capabilities.

[0099] Figure 9 This diagram illustrates the structure of a wireless charging receiver device according to an embodiment of this application. (Refer to...) Figure 9 The wireless charging receiver includes a clock synchronizer and a detector module. The clock synchronizer sends a reset signal to the detector module when the sampling clock synchronization moment is detected. The detector module outputs an average period value based on the reset signal for signal demodulation.

[0100] This embodiment incorporates a clock synchronizer, which enables the identification of the sampling clock synchronization moment. The clock synchronizer can determine the moment when the change in the average period value within two adjacent sampling periods abruptly occurs based on the collected period value changes, thus identifying the sampling clock synchronization moment of the wireless charging receiver. Once the sampling clock synchronization moment is determined, a reset signal is generated.

[0101] In this embodiment, the detection module includes a period value buffer module, a period count counter, and an average calculation unit. The period value buffer module buffers the period values ​​of the composite signal acquired by the RX device. The period value buffer module is connected to a clock synchronizer. Each time the clock synchronizer generates a reset signal, the period count counter increments by 1. When it reaches a set value, an overflow signal is generated, and the value is reset to zero. The overflow signal triggers the average calculation unit to perform an average calculation on the period values ​​in the period value buffer module, and then the period value buffer module is cleared. In this way, average calculation can be performed within each sampling period. Furthermore, due to the addition of the clock synchronizer, the sampling time can be synchronized with the clock of the FSK signal sent by the TX device, thereby improving the transmission rate of the FSK signal.

[0102] The wireless charging system provided in this embodiment is based on the same concept as the clock synchronization method for wireless charging described above. Therefore, it can at least achieve the beneficial effects that the clock synchronization method for wireless charging described above can achieve. Furthermore, any implementation of the clock synchronization method for wireless charging described above can be applied to the wireless charging system provided in this embodiment, and will not be described in detail here.

[0103] Example 4

[0104] Based on the same concept as the clock synchronization method for wireless charging described above, this application also provides an electronic device, please refer to... Figure 10 This illustrates a schematic diagram of an electronic device provided by some embodiments of this application. For example... Figure 10 As shown, the electronic device 20 includes: a processor 200, a memory 201, a bus 202, and a communication interface 203. The processor 200, the communication interface 203, and the memory 201 are connected via the bus 202. The memory 201 stores a computer program that can run on the processor 200. When the processor 200 runs the computer program, it executes the method provided in any of the foregoing embodiments of this application.

[0105] The memory 201 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 203 (which can be wired or wireless), such as the Internet, wide area network, local area network, or metropolitan area network.

[0106] Bus 202 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory 201 is used to store programs. After receiving an execution instruction, the processor 200 executes the program. The clock synchronization method for wireless charging disclosed in any of the foregoing embodiments of this application can be applied to the processor 200, or implemented by the processor 200.

[0107] The processor 200 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of the processor 200 or by instructions in software form. The processor 200 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 201. The processor 200 reads the information in memory 201 and, in conjunction with its hardware, completes the steps of the above method.

[0108] The electronic device provided in this application embodiment and the clock synchronization method for wireless charging provided in this application embodiment are based on the same application concept and have the same beneficial effects as the methods they adopt, operate or implement.

[0109] Example 5

[0110] This application also provides a computer-readable storage medium corresponding to the clock synchronization method for wireless charging provided in the foregoing embodiments.

[0111] Please refer to Figure 11 The computer-readable storage medium shown is an optical disc 30, on which a computer program (i.e., a program product) is stored. When the computer program is run by a processor, it executes the clock synchronization method for wireless charging provided in any of the foregoing embodiments.

[0112] It should be noted that examples of the computer-readable storage medium may also include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other optical and magnetic storage media, which will not be elaborated here.

[0113] The computer-readable storage medium provided in the above embodiments of this application and the clock synchronization method for wireless charging provided in the embodiments of this application are based on the same application concept and have the same beneficial effects as the methods adopted, run or implemented by the applications stored therein.

[0114] It should be noted that:

[0115] In the foregoing text, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0116] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0117] The embodiments of this application have been described above with reference to the accompanying drawings. These are merely specific implementations of this application, but this application is not limited to the specific implementations described above. The specific implementations described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A clock synchronization method for wireless charging, characterized in that, include: The period of the original signal of the wireless charging transmitter is adjusted based on a preset period adjustment signal to obtain a composite signal. The original signal includes a fundamental wave signal and a modulated wave signal with different period values. The preset period adjustment signal includes a preset number of period value superpositions. The preset number is obtained based on the number of original signal periods contained in one sampling period. Each period value superposition is matched with one original signal period. Based on the composite signal received by the wireless charging receiving device, the average period value within multiple sampling periods is obtained; The sampling clock synchronization time of the wireless charging receiving device is determined based on the change in the average period value within two adjacent sampling periods. The sampling clock synchronization time is the period change time of the fundamental wave signal and the modulation wave signal. The moment when the change in the average period value within two adjacent sampling periods abruptly occurs is determined as the sampling clock synchronization moment of the wireless charging receiver.

2. The method of claim 1, wherein, The adjustment of the period of the original signal of the wireless charging transmitter based on the preset period adjustment signal includes: The composite signal is obtained by superimposing the sum of the values ​​of each period with the corresponding original signal period; Specifically, for the superimposed composite signal, the average value of its fundamental wave signal period within one sampling period is equal to the average value of the fundamental wave signal period of the original signal, and the average value of its modulated wave signal period within one sampling period is equal to the average value of the modulated wave signal period of the original signal.

3. The method according to claim 1 or 2, characterized in that, Before adjusting the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal, the method includes: The period value superposition amount of the period adjustment signal is determined according to the increment or decrement method.

4. A clock synchronization device for wireless charging, characterized in that, The device includes: The period adjustment module is used to adjust the period of the original signal of the wireless charging transmitter based on a preset period adjustment signal to obtain a composite signal. The original signal includes a fundamental wave signal and a modulated wave signal with different period values. The preset period adjustment signal includes a preset number of period value superpositions, which are obtained based on the number of original signal periods contained in one sampling period. Each period value superposition is matched with one original signal period. The calculation module is used to obtain the average period value over multiple sampling periods based on the composite signal received by the wireless charging receiving device. The clock synchronization module is used to determine the sampling clock synchronization time of the wireless charging receiving device based on the change in the average period value within two adjacent sampling periods, wherein the sampling clock synchronization time is the time of period change of the fundamental wave signal and the modulation wave signal; and to determine the time when the change in the average period value within two adjacent sampling periods changes abruptly as the sampling clock synchronization time of the wireless charging receiving device.

5. A wireless charging system, characterized by, The system includes: a control unit, a wireless charging transmitter, and a wireless charging receiver; The control unit is used to execute the clock synchronization method for wireless charging as described in any one of claims 1-3, and to control the wireless charging transmitting device to send a composite signal; The wireless charging receiver is used to receive the composite signal and demodulate the composite signal.

6. The system according to claim 5, characterized in that, The wireless charging transmitter includes: a cycle controller and a PWM generator; The cycle controller is connected to the control unit and the PWM generator through different interfaces. The cycle controller is used to receive a cycle table sent by the control unit. The cycle table contains the period value of the composite signal. The cycle controller is used to send the period value of the composite signal to the PWM generator according to the cycle period table; The PWM generator is used to generate a PWM control signal based on the period value of the composite signal.

7. The system of claim 6, wherein, The cycle controller includes a cycle table cache module, a cycle counter, and a parameter scheduler; The input of the periodic table cache module is connected to the control unit, and the output of the periodic table cache module is connected to the first end of the parameter scheduler. The loop counter is connected to the second end of the parameter scheduler; The parameter scheduler sends the period value of the composite signal to the PWM generator through the third terminal, and the parameter scheduler receives the trigger signal sent by the PWM generator through the fourth terminal.

8. The system of claim 7, wherein, The wireless charging receiver includes: a clock synchronizer and a detector module; The clock synchronizer is used to send a clear signal to the detection module when the sampling clock synchronization moment is detected; The detection module is used to output an average period value based on the zeroing signal for signal demodulation.

9. An electronic device, characterized in that, The method includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method as claimed in any one of claims 1-3.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by a processor to implement the method as described in any one of claims 1-3.

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