A wireless charging method, an electronic device, and a charging system

Abstract

A wireless charging method, an electronic device and a charging system. In this method, a first electronic device transmits a first wireless charging signal to a second electronic device at a charging frequency of a first frequency and an output voltage of a first voltage. When the second electronic device instructs the first electronic device to increase the transmission power, the first electronic device decreases the charging frequency to increase the transmission power. When the charging frequency is adjusted to the minimum value and the second electronic device still instructs the first electronic device to increase the transmission power, the first electronic device increases the output voltage to increase the transmission power. Implementing this technical solution improves the flexibility of adjusting the wireless charging power.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and in particular, to a wireless charging method, an electronic device, and a charging system. Background Art

[0002] In recent years, the application of wireless charge technology in electronic devices has become increasingly widespread. The wireless charge technology can be applied to the scenario where a charging base charges an electronic device, and can also be used in the scenario where a wireless charging device such as a mobile phone charges other electronic devices in reverse. In the reverse charging scenario, a wireless charging device such as a mobile phone can wirelessly transmit the electric energy in its own battery to a wireless power receiving device such as a Bluetooth headset.

[0003] Currently, most wireless charging technologies use electromagnetic induction to achieve power transmission. When performing wireless charging, a wireless charging device converts the electric energy in its own battery into alternating current and uses a charging coil to generate a magnetic field. This magnetic field is coupled to a power receiving coil in a wireless power receiving device that is very close, and the power receiving coil generates electric energy. This electric energy can be supplied for use by the wireless power receiving device.

[0004] However, when performing reverse charging, the power output by the wireless charging device may be too large, thus damaging the chip in the wireless power receiving device. Summary of the Invention

[0005] Embodiments of this application provide a wireless charging method, an electronic device, and a charging system, which reduce the situation where the chip of the wireless power receiving device is damaged due to excessive power during reverse charging, and improve the convenience of reverse charging.

[0006] In a first aspect, the present application provides a wireless charging method, which includes: a first electronic device transmits a first wireless charging signal to a second electronic device in a wireless manner, the frequency of the first wireless charging signal is a first frequency, and the voltage of the first wireless charging signal is a first voltage; when the first electronic device transmits the first wireless charging signal to the second electronic device in a wireless manner, in response to a first power adjustment signal from the second electronic device, the first power adjustment signal is used to indicate increasing the power of the wireless charging signal, the first electronic device transmits a second wireless charging signal to the second electronic device in a wireless manner, the frequency of the second wireless charging signal is a second frequency, the voltage of the second wireless charging signal is the first voltage, and the second frequency is less than the first frequency; when the first electronic device transmits the second wireless charging signal to the second electronic device in a wireless manner, the second frequency matches a first frequency threshold, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner, the voltage of the third wireless charging signal is a second voltage, and the second voltage is greater than the first voltage.

[0007] When implementing the method provided in the first aspect, the first electronic device can adjust the charging frequency according to the requirements from the second electronic device to adjust the transmission power. In addition, the first electronic device can also adjust the output voltage according to the current charging frequency to adjust the transmission power. In this way, by adjusting the charging frequency and the output voltage, the power adjustment range of the first electronic device is increased. The first electronic device can timely adjust the parameters of power transmission, reduce the situation of damaging the chip of the second electronic device during reverse charging, and improve the convenience of reverse charging.

[0008] Among them, the second frequency matching the first frequency threshold means that the second frequency is less than or equal to the first frequency threshold.

[0009] The following introduces two methods for determining that the second frequency is less than or equal to the first frequency threshold: (1) When the current charging frequency (the second frequency) is continuously less than or equal to the first frequency threshold (i.e., the minimum value of the frequency) within a first set time, the second frequency is less than or equal to the first frequency threshold. (2) When the average value of the current charging frequency within a first set time is less than or equal to the first frequency threshold, the second frequency is less than or equal to the first frequency threshold.

[0010] In the embodiments of the present application, the first frequency threshold and the second frequency threshold can be sent by a processor in the first electronic device to a wireless charging circuit. Specifically, when the first electronic device receives a user operation for starting reverse charging, the processor in the first electronic device can wake up the wireless charging circuit and send initialization parameters to the wireless charging circuit.

[0011] In some embodiments, the first frequency threshold is 110KHz and the second frequency threshold is 135KHz.

[0012] Wherein, the second electronic device may periodically transmit a power adjustment signal to the first electronic device, for example, transmitting a power adjustment signal every 150 ms. The power adjustment signal may indicate increasing the transmission power, decreasing the transmission power, or not changing the transmission power.

[0013] In combination with the first aspect, in some embodiments, the method further includes: when the first electronic device wirelessly transmits the first wireless charging signal to the second electronic device, in response to a third power adjustment signal from the second electronic device, the third power adjustment signal is used to indicate reducing the power of the wireless charging signal, the first electronic device wirelessly transmits a fourth wireless charging signal to the second electronic device, the fourth wireless charging signal has a third frequency, the voltage of the fourth wireless charging signal is the first voltage, and the third frequency is greater than the first frequency.

[0014] In combination with the first aspect, in some embodiments, the method further includes: when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the third frequency matches the second frequency threshold, in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate reducing the power of the wireless charging signal, the first electronic device wirelessly transmits a fifth wireless charging signal to the second electronic device, the voltage of the fifth wireless charging signal is the third voltage, the third voltage is less than the first voltage, and the second frequency threshold is greater than the first frequency threshold.

[0015] In combination with the first aspect, in some embodiments, the first electronic device includes a power supply circuit and a wireless charging circuit, and the power supply circuit provides a voltage to the wireless charging circuit; when the first electronic device wirelessly transmits the first wireless charging signal, the second wireless charging signal, or the fourth wireless charging signal to the second electronic device, the power supply circuit inputs the first voltage to the wireless charging circuit; when the first electronic device wirelessly transmits the third wireless charging signal to the second electronic device, the power supply circuit inputs the second voltage to the wireless charging circuit; when the first electronic device wirelessly transmits the fifth wireless charging signal to the second electronic device, the power supply circuit inputs the third voltage to the wireless charging circuit.

[0016] Wherein, the power supply circuit is further configured to boost the voltage output by the battery. The power supply circuit can be implemented by a boost circuit.

[0017] Among them, the wireless charging circuit can also convert the direct current received from the power supply circuit into alternating current. For example, the wireless charging circuit can include a DC-AC circuit for converting the direct current output by the power supply circuit into alternating current. The wireless charging circuit can include one or more of the following circuits for realizing the conversion of direct current to alternating current: full-bridge inverter circuit, half-bridge inverter circuit. The wireless charging circuit can include other inverter circuits for realizing the conversion of direct current to alternating current, which are not limited in the embodiments of the present application.

[0018] Combined with the first aspect, in some embodiments, when the first electronic device transmits the second wireless charging signal to the second electronic device in a wireless manner, the second frequency matches the first frequency threshold, and in response to the second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner, including: when the first electronic device transmits the second wireless charging signal to the second electronic device in a wireless manner, the second frequency matches the first frequency threshold, the current input by the power supply circuit to the wireless charging circuit matches the first current threshold, and in response to the second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner.

[0019] Wherein, the current input by the power supply circuit to the wireless charging circuit matching the first current threshold means that the current input by the power supply circuit to the wireless charging circuit is greater than or equal to the first current threshold.

[0020] The following introduces two methods for determining that the current is greater than or equal to the first current threshold: (1) The current input by the power supply circuit to the wireless charging circuit continuously remains greater than or equal to the first current threshold within the second set time. (2) The average value of the current input by the power supply circuit to the wireless charging circuit within the second set time is greater than or equal to the first current threshold.

[0021] In combination with the first aspect, in some embodiments, when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the third frequency matches the second frequency threshold. In response to the fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate reducing the power of the wireless charging signal. The first electronic device wirelessly transmits the fifth wireless charging signal to the second electronic device, including: when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the third frequency matches the second frequency threshold, the current input by the power supply circuit to the wireless charging circuit matches the second current threshold. In response to the fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate reducing the power of the wireless charging signal. The first electronic device wirelessly transmits the fifth wireless charging signal to the second electronic device.

[0022] Wherein, the current input by the power supply circuit to the wireless charging circuit matching the second current threshold means that the current input by the power supply circuit to the wireless charging circuit is less than or equal to the second current threshold.

[0023] In the embodiments of the present application, the first current threshold and the second current threshold may also be carried in the initialization parameters and sent by the processor in the first electronic device to the wireless charging circuit. When different output voltage values are involved, the values of the first current threshold and the second current threshold may be different. Exemplarily, when the output voltage is 6.8V, the first current threshold is 0.8A and the second current threshold is 0.4A. When the output voltage is 5V, the first current threshold is 0.7A. When the output voltage is 9.9V, the second current threshold is 0.5A.

[0024] In combination with the first aspect, in some embodiments, the duty cycle of the second wireless charging signal is a first duty cycle. When the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matches a first frequency threshold. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device wirelessly transmits a third wireless charging signal to the second electronic device, including: when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matches a first frequency threshold. In response to a fifth power adjustment signal from the second electronic device, the fifth power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device wirelessly transmits a sixth wireless charging signal to the second electronic device, and the duty cycle of the sixth wireless charging signal is a second duty cycle, and the second duty cycle is greater than the first duty cycle; when the first electronic device wirelessly transmits the sixth wireless charging signal to the second electronic device, the second duty cycle matches a duty cycle threshold. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device wirelessly transmits a third wireless charging signal to the second electronic device.

[0025] Wherein, the second duty cycle matching the duty cycle threshold means that the second duty cycle is greater than or equal to the duty cycle threshold.

[0026] Wherein, the duty cycle threshold is the maximum value of the duty cycle. In the embodiments of the present application, the initialization parameter may further include the value range of the duty cycle of the alternating current. The value range of the duty cycle may include the maximum value and the minimum value of the duty cycle.

[0027] In other embodiments, when the charging frequency does not reach the minimum value and the transmission power needs to be increased, the wireless charging circuit may decrease the charging frequency to increase the transmission power. When the charging frequency is the minimum value and the power adjustment signal indicates that the transmission power needs to be increased, the wireless charging circuit increases the duty cycle of the alternating current. When the charging frequency does not reach the maximum value and the transmission power needs to be decreased, the wireless charging circuit may increase the charging frequency to decrease the transmission power. When the charging frequency is the maximum value and the power adjustment signal indicates that the transmission power needs to be decreased, the wireless charging circuit decreases the duty cycle of the alternating current.

[0028] In another possible embodiment, when the charging frequency is the minimum value, the duty cycle of the alternating current is the maximum value, and the current input by the power supply circuit to the wireless charging circuit is the maximum input current, the first electronic device increases the output voltage. When the charging frequency is the maximum value, the duty cycle of the alternating current is the minimum value, and the current input by the power supply circuit to the wireless charging circuit is the minimum input current, the first electronic device decreases the output voltage.

[0029] In combination with the first aspect, in some embodiments, the first power adjustment signal and the second power adjustment signal are transmitted through in-band communication, or the first power adjustment signal and the second power adjustment signal are Bluetooth signals from the second electronic device.

[0030] Specifically, in the in-band communication scenario, the first power adjustment signal and the second power adjustment signal may be amplitude-modulated signals with a frequency of 2KHz received by the wireless charging circuit. In the Bluetooth communication scenario, both the first electronic device and the second electronic device include Bluetooth modules, and the Bluetooth module of the second electronic device transmits the first power adjustment signal and the second power adjustment signal.

[0031] Among them, the power adjustment signal may include an 8-bit signed number, and this signed number can be used to indicate an increase or decrease in the transmission power. Exemplarily, if the signed number is positive, it indicates that the transmission power needs to be increased, indicating that the transmission power required by the second electronic device is greater than the current transmission power. If the signed number is negative, it indicates that the transmission power needs to be decreased, indicating that the transmission power required by the second electronic device is less than the current transmission power. If the signed number is 0, it indicates that the current transmission power needs to be maintained, indicating that the transmission power required by the second electronic device is equal to the current transmission power.

[0032] During the charging process, when the power of the first electronic device itself is lower than a set threshold (for example, lower than 30% of the remaining power), the processor in the first electronic device may instruct to reduce the transmission power. The wireless charging circuit may also increase the charging frequency according to the instruction, and the power supply circuit may also reduce the output voltage according to the instruction to reduce the transmission power. In this way, during reverse charging, the situation that the wireless charging device 11 outputs too much power and affects the use is reduced, and the convenience of reverse charging is improved.

[0033] In other embodiments, during the charging process, when the proportion of the power output by the first electronic device in the total power is lower than a set threshold (for example, lower than 30%), the processor in the first electronic device may instruct to reduce the transmission power. The wireless charging circuit may also increase the charging frequency according to the instruction, and the power supply circuit may also reduce the output voltage according to the instruction to reduce the transmission power. Among them, the proportion of the output power in the total power may be stored by the first electronic device in response to a user operation.

[0034] Second aspect, the present application provides an electronic device, which is a first electronic device. The first electronic device includes: one or more processors, a battery, a power supply circuit, a wireless charging circuit, and a charging coil; the battery supplies power to the wireless charging circuit through the power supply circuit, and the wireless charging circuit transmits a wireless charging signal through the charging coil; the processor is respectively connected to the power supply circuit and the wireless charging circuit; wherein: the wireless charging circuit is configured to transmit a first wireless charging signal to a second electronic device through the charging coil according to a first voltage provided by the power supply circuit, and the frequency of the first wireless charging signal is a first frequency; the wireless charging circuit is further configured to, when transmitting the first wireless charging signal to the second electronic device through the charging coil, in response to a first power adjustment signal from the second electronic device, transmit a second wireless charging signal to the second electronic device through the charging coil, the frequency of the second wireless charging signal is a second frequency, the voltage of the second wireless charging signal is the first voltage, and the second frequency is less than the first frequency; the processor is configured to obtain the second frequency; when the second frequency matches a first frequency threshold, the processor is further configured to instruct the power supply circuit to provide a second voltage to the wireless charging circuit, and the second voltage is greater than the first voltage; the wireless charging circuit is further configured to transmit a third wireless charging signal to the second electronic device through the charging coil according to the second voltage provided by the power supply circuit.

[0035] The electronic device provided in the second aspect is a first electronic device, and the first electronic device can adjust the charging frequency to adjust the transmission power according to the requirements from the second electronic device. In addition, the first electronic device can also adjust the output voltage according to the current charging frequency to adjust the transmission power. In this way, by adjusting the charging frequency and the output voltage, the power adjustment range of the first electronic device is increased. The first electronic device can timely adjust the parameters of power transmission, reduce the situation of damaging the chip of the second electronic device during reverse charging, and improve the convenience of reverse charging.

[0036] In combination with the second aspect, in some embodiments, the wireless charging circuit is further configured to, when transmitting the first wireless charging signal to the second electronic device through the charging coil, in response to a third power adjustment signal from the second electronic device, the third power adjustment signal is used to indicate reducing the power of the wireless charging signal, transmit a fourth wireless charging signal to the second electronic device through the charging coil, the frequency of the fourth wireless charging signal is a third frequency, the voltage of the fourth wireless charging signal is the first voltage, and the third frequency is greater than the first frequency.

[0037] In combination with the second aspect, in some embodiments, when the wireless charging circuit transmits the fourth wireless charging signal to the second electronic device through the charging coil, the third frequency matches the second frequency threshold. In response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate reducing the power of the wireless charging signal. The fifth wireless charging signal is transmitted to the second electronic device through the charging coil. The voltage of the fifth wireless charging signal is the third voltage, and the third voltage is less than the first voltage. The second frequency threshold is greater than the first frequency threshold.

[0038] In combination with the second aspect, in some embodiments, when the wireless charging circuit transmits the first wireless charging signal, the second wireless charging signal, or the fourth wireless charging signal to the second electronic device through the charging coil, the power supply circuit inputs the first voltage to the wireless charging circuit; when the wireless charging circuit transmits the third wireless charging signal to the second electronic device through the charging coil, the power supply circuit inputs the second voltage to the wireless charging circuit; when the wireless charging circuit transmits the fifth wireless charging signal to the second electronic device through the charging coil, the power supply circuit inputs the third voltage to the wireless charging circuit.

[0039] In combination with the second aspect, in some embodiments, the wireless charging circuit is specifically configured to: when transmitting the second wireless charging signal to the second electronic device through the charging coil, the second frequency matches the first frequency threshold, and the current input by the power supply circuit to the wireless charging circuit matches the first current threshold. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, and the third wireless charging signal is transmitted to the second electronic device through the charging coil.

[0040] In combination with the second aspect, in some embodiments, the wireless charging circuit is specifically configured to: when transmitting the fourth wireless charging signal to the second electronic device through the charging coil, the third frequency matches the second frequency threshold, and the current input by the power supply circuit to the wireless charging circuit matches the second current threshold. In response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate reducing the power of the wireless charging signal, and the fifth wireless charging signal is transmitted to the second electronic device through the charging coil.

[0041] In combination with the second aspect, in some embodiments, the first frequency threshold is 110 KHz, and the second frequency threshold is 135 KHz.

[0042] In combination with the second aspect, in some embodiments, the duty cycle of the second wireless charging signal is a first duty cycle. The wireless charging circuit is specifically configured to: when transmitting the second wireless charging signal to the second electronic device through the charging coil, if the second frequency matches a first frequency threshold, in response to a fifth power adjustment signal from the second electronic device, where the fifth power adjustment signal is used to indicate increasing the power of the wireless charging signal, transmit a sixth wireless charging signal to the second electronic device through the charging coil, and the duty cycle of the sixth wireless charging signal is a second duty cycle, and the second duty cycle is greater than the first duty cycle;

[0043] When transmitting the sixth wireless charging signal to the second electronic device through the charging coil, if the second duty cycle matches a duty cycle threshold, in response to a second power adjustment signal from the second electronic device, where the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, transmit a third wireless charging signal to the second electronic device through the charging coil.

[0044] In combination with the second aspect, in some embodiments, the first power adjustment signal and the second power adjustment signal are sent through in-band communication and are received by the wireless charging circuit, or the electronic device further includes a Bluetooth module, and the first power adjustment signal and the second power adjustment signal are Bluetooth signals from the second electronic device and are received by the Bluetooth module.

[0045] In a third aspect, the present application provides a charging system, which includes a first electronic device and a second electronic device, where: the first electronic device transmits a wireless charging signal to the second electronic device wirelessly; the second electronic device is configured to send a power adjustment signal to the first electronic device when receiving the wireless charging signal transmitted by the first electronic device wirelessly; the first electronic device is configured to execute the wireless charging method provided in the first aspect or any implementation manner of the first aspect.

[0046] In a fourth aspect, an embodiment of the present application provides a computer storage medium, including computer instructions, which, when running on an electronic device, cause the electronic device to execute the wireless charging method provided in the first aspect or any implementation manner of the first aspect of the embodiments of the present application.

[0047] In a fifth aspect, an embodiment of the present application provides a computer program product, which, when running on an electronic device, causes the electronic device to execute the wireless charging method provided in the first aspect or any implementation manner of the first aspect of the embodiments of the present application.

[0048] Understandably, the electronic device provided in the second aspect, the charging system provided in the third aspect, the computer storage medium provided in the fourth aspect, and the computer program product provided in the fifth aspect are all used to execute the wireless charging method provided in the first aspect. Therefore, the beneficial effects they can achieve can refer to the beneficial effects in the wireless charging method provided in the first aspect, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 FIG. is a schematic diagram of a reverse charging system provided by an embodiment of the present application;

[0050] Figure 2 FIG. is a schematic structural diagram of a wireless charging device 11 and a wireless power receiving device 12;

[0051] Figure 3 FIG. is a schematic diagram of an equivalent circuit structure of a charging system provided by an embodiment of the present application;

[0052] Figure 4 FIG. is a schematic diagram of the relationship between the transmission power and the charging frequency provided by an embodiment of the present application;

[0053] Figure 5 FIG. is a schematic flowchart of a wireless charging method provided by an embodiment of the present application;

[0054] Figure 6 FIG. is a schematic flowchart of a wireless charging method provided by an embodiment of the present application;

[0055] Figure 7 FIG. is a schematic diagram of parameters for adjusting power transmission provided by an embodiment of the present application;

[0056] Figure 8 FIG. is a schematic diagram of parameters for adjusting power transmission provided by an embodiment of the present application;

[0057] Figure 9 FIG. is a schematic diagram of parameters for adjusting power transmission provided by an embodiment of the present application;

[0058] Figure 10 FIG. is a schematic structural diagram of an electronic device 100 provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] The technical solutions in the embodiments of the present application will be clearly and elaborately described below with reference to the accompanying drawings. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may represent A or B; "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

[0060] Hereinafter, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as implying or suggesting relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality" is two or more than two.

[0061] First, the reverse charging scenario involved in the embodiments of the present application will be introduced. Please refer to Figure 1 , Figure 1 which is a schematic diagram of the reverse charging system provided by the embodiments of the present application. As Figure 1 shown, the reverse charging system may include a wireless charging device 11 and a wireless power receiving device 12. The wireless charging device 11 can charge the wireless power receiving device 12. Specifically, the wireless charging device 11 can convert the electrical energy in its own battery into alternating current and generate a magnetic field using a coil. This magnetic field is coupled to the coil in the wireless power receiving device 12 that is very close, and the coil generates electrical energy.

[0062] Among them, the area 102 on the outer shell of the wireless charging device 11 is the induction area for reverse charging, and the charging coil of the wireless charging device 11 is arranged inside the body corresponding to the area 102. Corresponding to the wireless charging device 11, the power receiving coil in the wireless power receiving device 12 is arranged opposite to the charging coil. During reverse charging, the power receiving coil of the wireless power receiving device 12 approaches the area 102. For example, the wireless power receiving device 12 contacts the area 102 on the outer shell of the wireless charging device 11. The magnetic field generated by the charging coil of the wireless charging device 11 is coupled to the power receiving coil, thereby realizing reverse charging from the wireless charging device 11 to the wireless power receiving device 12.

[0063] It can be understood that the embodiments of the present application are not limited to wireless charging by the above electromagnetic induction method, and other methods can also be used to achieve wireless charging, such as energy transmission in the wireless charging process through forms such as electromagnetic waves and microwaves. The embodiments of the present application do not limit this. In addition, the embodiments of the present application are not limited to being applied to the above reverse charging scenario, and can also be applied to scenarios where a charging base (wireless charger) charges a power receiving device such as a mobile phone.

[0064] In the embodiments of the present application, the wireless charging device 11 may be an electronic device such as a mobile phone, a tablet computer, a wireless charger, a handheld computer, a wearable device, a vehicle-mounted device, a virtual reality device, a smart home device, etc., or may also be a functional module installed on or running on the above-mentioned electronic devices. The wireless power receiving device 12 may be a mobile phone, a cordless phone, a smart watch, wireless earphones, a wearable device, a tablet device, a handheld device with wireless communication function, a computing device, a virtual reality device, a vehicle-mounted communication module, a smart meter, or other processing devices connected to a wireless modem, etc., or may also be a functional module installed on or running on the above-mentioned devices.

[0065] Next, in combination with the structural schematic diagram of the device, the principle of the wireless charging device 11 charging the wireless power receiving device 12 in reverse will be introduced. Please refer to Figure 2 , Figure 2 which is the structural schematic diagram of the wireless charging device 11 and the wireless power receiving device 12. Next, the internal modules and functions of the wireless charging device 11 and the wireless power receiving device 12 will be introduced respectively in combination with Figure 2 .

[0066] (1) Wireless charging device 11

[0067] As Figure 2 shown, the wireless charging device 11 may include a processor 201, a charging coil 202, a wireless charging chip 203, a power supply chip 204, and a battery 205. Among them:

[0068] The processor 201 can be used to wake up the power supply chip 204 and the wireless charging chip 203 from the sleep state to the powered-on state in response to a user operation for starting reverse charging. The processor 201 can also send initialization parameters to the wireless charging chip 203. The initialization parameters may include a charging frequency value range. The charging frequency is the frequency of the alternating current output by the wireless charging chip 203. In addition, the initialization parameters may also include over current protection (OCP), overvoltage protection (OVP), the time interval for sending a packet internet groper (ping) signal, the duration of sending the ping signal, etc.

[0069] The processor 201 may also store multiple output voltage values, such as: 5V, 6.8V, and 9.9V. The voltage value output by the power supply chip 204 controlled by the processor 201 can be any one of the multiple output voltage values, for example: the output voltage value is 6.8V. The processor 201 also stores the charging frequency threshold of the wireless charging chip 203 corresponding to any output voltage value, and the current threshold input by the power supply chip 204 to the wireless charging chip 203 corresponding to any output voltage value. As shown in Table 1 below. The charging frequency threshold includes at least the maximum charging frequency value or the minimum charging frequency value. The current threshold input by the power supply chip 204 to the wireless charging chip 203 includes at least the maximum input current value or the minimum input current value.

[0070] When the power supply chip 204 outputs a first voltage value (such as 6.8V) to the wireless charging chip 203, and the processor 201 monitors that the charging frequency of the wireless charging chip 203 reaches the maximum charging frequency value corresponding to the first voltage value, and the current input by the power supply chip 204 to the wireless charging chip 203 is less than or equal to the minimum input current value corresponding to the first voltage value, the processor 201 may notify the power supply chip 204 to reduce the output voltage value.

[0071] Similarly, when the power supply chip 204 outputs a first voltage value (such as 6.8V) to the wireless charging chip 203, and the processor 201 monitors that the charging frequency of the wireless charging chip 203 reaches the minimum charging frequency value corresponding to the first voltage value, and the current input by the power supply chip 204 to the wireless charging chip 203 is greater than or equal to the maximum input current value corresponding to the first voltage value, the processor 201 may notify the power supply chip 204 to increase the output voltage value.

[0072] The processor 201 may include one or more processing units. For example: the processor 201 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a processor, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0073] After power-on, the power supply chip 204 can output the electrical energy of the battery 205 to the wireless charging chip 203. The power supply chip 204 is also used to boost the voltage output by the battery 205. The power supply chip 204 can be controlled by the processor 201 to increase or decrease the output voltage of the power supply chip 204. The processor 201 can control the power supply chip 204 to increase or decrease the output voltage of the power supply chip 204. For example, the processor 201 can control the power supply chip 204 to increase the output voltage of the power supply chip 204 from 5V to 6.8V. The processor 201 can also control the power supply chip 204 to decrease the output voltage of the power supply chip 204 from 6.8V to 5V. Among them, the power supply chip 204 can be implemented by a boost circuit.

[0074] The wireless charging chip 203 can send a detection signal (such as a ping signal) via the charging coil 202 according to the initialization parameters issued by the processor 201. When the distance between the wireless power receiving device 12 and the charging coil 202 is close enough, the wireless power receiving device 12 receives the detection signal. The wireless power receiving device 12 feeds back a response signal to the wireless charging chip 203, so that the wireless charging device 11 and the wireless power receiving device 12 successfully shake hands and start transmitting the electrical energy of the battery 205 to the wireless power receiving device 12. For example, the initialization parameters can include a voltage value of 5V, and the charging frequency value range is 110 - 135KHz. Then, the processor 201 can notify the power supply chip 204 to adjust the output voltage to 5V. Then, the wireless charging chip 203 sends a ping signal via the charging coil 202. The ping signal can be an AC energy signal with a frequency of 135KHz, and the frequency of the ping signal is within the charging frequency value range.

[0075] The response signal fed back by the wireless power receiving device 12 can be an amplitude-modulated signal with a frequency of 2KHz sent through in-band communication. The response signal fed back by the wireless power receiving device can also be a response signal fed back through other short-range wireless communication methods. The embodiments of the present application do not limit the communication method for feeding back the response signal.

[0076] The wireless charging chip 203 can also convert the direct current received from the power supply chip 204 into alternating current. The wireless charging chip 203 can also adjust the charging frequency. The wireless charging chip 203 can receive a power adjustment signal from the wireless power receiving device 12 via the charging coil 202 and adjust the charging frequency according to the power adjustment signal to adjust the transmission power.

[0077] Among them, the wireless charging chip 203 may include a direct current - alternating current (DC - AC) circuit for converting the direct current output by the power supply chip 204 into alternating current. The wireless charging chip 203 may include one or more of the following circuits for realizing the conversion of direct current to alternating current: full - bridge inverter circuit, half - bridge inverter circuit. The wireless charging chip 203 may include other inverter circuits for realizing the conversion of direct current to alternating current, which is not limited in the embodiments of the present application.

[0078] The charging coil 202 is used to generate a magnetic field by using the alternating current output from the wireless charging chip 203 to transmit energy. When the power - receiving coil 301 in the wireless power - receiving device 12 is in this magnetic field, the magnetic field can be coupled into the power - receiving coil 301, and the energy in the magnetic field is converted into electric energy for the wireless power - receiving device 12 to use. The coupling of the magnetic field to the power - receiving coil 301 can utilize the principle of electromagnetic induction.

[0079] Optionally, the wireless charging chip 203 and the power supply chip 204 can be integrated on one chip, which can be called a transmitting chip in the embodiments of the present application.

[0080] The above - mentioned processor 201, wireless charging coil 202, wireless charging chip 203, power supply chip 204, and battery 205 can be separately implemented as multiple circuits, or can be combined with each other to form one chip. The present application does not limit the combined structure of each functional module in the wireless charging device. In the embodiments of the present application, the wireless charging chip 203 and the power supply chip 204 can be collectively referred to as a transmitting chip.

[0081] (2) Wireless power - receiving device 12

[0082] As Figure 2 shown, the wireless power - receiving device 12 may include a power - receiving coil 301, a wireless power - receiving chip 302, a processor 303, and a battery 304. Among them:

[0083] When the wireless power - receiving device 12 approaches the induction area 102 of the wireless charging device 11, for example, the wireless power - receiving device 12 is placed on the wireless charging device 11 and contacts through the induction area 102, the magnetic field generated by the charging coil 202 can be coupled into the power - receiving coil 301. The power - receiving coil 301 can generate electric energy.

[0084] The wireless power - receiving chip 302 can be used to receive the electric energy generated by the power - receiving coil 301 and process it, such as converting alternating current to direct current, rectifying, and stabilizing voltage, etc. The electric energy output by the wireless power - receiving chip 302 can charge the battery 304.

[0085] The battery 304 can be used to receive electrical energy from the wireless power receiving chip 302 and store it, and can also supply power to the power-consuming devices in the wireless power receiving device 12.

[0086] When the wireless power receiving device 12 is placed on the induction area 102 of the wireless charging device 11, the magnetic field generated by the charging coil 202 is coupled to the power receiving coil 301. The wireless power receiving chip 302 can receive the ping signal via the power receiving coil 301. The wireless power receiving chip 302 can feedback a response signal to the wireless charging device 11 through in-band communication. The response signal is, for example, an amplitude-modulated signal with a frequency of 2KHz. For the principle of in-band communication, reference can be made to the description later.

[0087] The wireless power receiving device 12 is not limited to feedback the response signal through the above-mentioned in-band communication method, and can also feedback the response signal through other short-distance wireless communication methods. For example, both the wireless power receiving device 12 and the wireless charging device 11 can include a Bluetooth module, and the Bluetooth module is used to transmit the response signal and the power adjustment signal through Bluetooth communication. For another example, both the wireless power receiving device 12 and the wireless charging device 11 can include a Wi-Fi module, and the Wi-Fi module is used to transmit the response signal and the power adjustment signal through Wi-Fi communication.

[0088] It should be understood that the wireless charging device 11 and the wireless power receiving device 12 can have more or fewer components than those shown in the figure, two or more components can be combined, or different component configurations can be adopted. The various components shown in the figure can be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application-specific integrated circuits.

[0089] The following combines Figure 2 to introduce the principle of adjusting the transmission power and the communication principle involved in the embodiments of the present application.

[0090] (1) The transmission power of the wireless charging device 11

[0091] In the embodiments of the present application, the transmission power of the wireless charging device 11 refers to the power output by the wireless charging chip 203. The greater the transmission power of the wireless charging device 11, the faster the charging speed of the wireless power receiving device 12. Among them, the transmission power of the wireless charging device 11 needs to be adjusted according to the power adjustment signal from the wireless power receiving device 12. The parameters related to the transmission power can include the output voltage, the charging frequency, the input current, and the duty cycle of the alternating current. The wireless charging device 11 can adjust the transmission power by adjusting the output voltage and the charging frequency. The output voltage, the charging frequency, the input current, and the duty cycle of the alternating current are introduced separately below.

[0092] (a) Output voltage

[0093] The output voltage of the wireless charging device 11 is the DC voltage output at the output terminal of the power supply chip 204. The transmission power is positively correlated with the output voltage of the wireless charging device 11. After the power supply chip 204 boosts the output voltage of the battery 205, the output voltage is the output voltage. For example, the output voltage of the battery 205 is any voltage value in the range of 3.5 to 4.4V. This voltage value is input to the power supply chip 204, and the output voltage after boosting is 5V or 6.8V.

[0094] (b) Charging frequency

[0095] The charging frequency of the wireless charging device 11 is the frequency of the alternating current output by the wireless charging chip 203. In the embodiment of the present application, a capacitor may be connected in series with the charging coil 202 in the wireless charging device 11 to form an oscillation circuit. The frequency of the alternating current output by the wireless charging chip 203 (i.e., the charging frequency) when the charging coil 202 in the wireless charging device 11 resonates with the capacitor is the resonance frequency. At this resonance frequency, the equivalent resistance of the wireless charging device 11 is the smallest. This equivalent resistance can refer to Figure 3 the Rp in the described example. From the relationship between the equivalent impedance Rp and the transmission power P = U 2 / Rp, it can be seen that the equivalent impedance Rp is the smallest at the resonance frequency. Therefore, the transmission power of the wireless charging device 11 is the largest at this resonance frequency.

[0096] Please refer to Figure 3 , Figure 3 which is a schematic diagram of the equivalent circuit structure of a charging system provided by an embodiment of the present application. Figure 3 It can be Figure 2 the schematic diagram of the equivalent circuit structure of the shown structure diagram. Figure 2 In the shown structure, the capacitor connected in series with the charging coil 202 and the capacitor connected in series with the power receiving coil 301 are not shown.

[0097] As Figure 3 shown, on the wireless charging device 11 side, the input electric energy of the input oscillation circuit is the electric energy output by the wireless charging chip 203. The current of the input oscillation circuit is I1, and I1 is the current output by the wireless charging chip 203. The self-inductance value of the charging coil 202 is Lp, the capacitance value of the capacitor connected in series with the charging coil 202 is Cp, and the equivalent resistance of the wireless charging device 11 is Rp.

[0098] On the wireless power receiving device 12 side, the self-inductance value of the power receiving coil 301 is Ls, the capacitance value of the capacitor connected in series with the power receiving coil 301 is Cs, and the equivalent resistance is Rs. The impedance of the load is R load .

[0099] Figure 3In the charging system shown, the frequency of the alternating current output by the wireless charging chip 203 when the charging coil 202 resonates with the capacitor is the resonance frequency. This resonance frequency is related to Lp and Cp. This resonance frequency is the same as the resonance frequency of the oscillation circuit in the wireless power receiving device 12. The resonance frequency of the oscillation circuit in the wireless power receiving device 12 is related to Ls and Cs.

[0100] Exemplarily, the resonance frequency of the wireless charging device 11 can be 110 KHz. When the charging frequency is equal to the resonance frequency, the equivalent impedance Rp is the smallest. From the relationship between the equivalent impedance Rp and the transmitted power P = U 2 / Rp, it can be seen that when the charging frequency is equal to the resonance frequency of 110 KHz, the equivalent impedance Rp is the smallest and the transmitted power is the largest.

[0101] Please refer to Figure 4 , Figure 4 which is a schematic diagram showing the relationship between the transmitted power and the charging frequency provided by an embodiment of the present application. As Figure 4 shown, the resonance frequency of the wireless charging device 11 is 110 KHz. When the charging frequency is equal to the resonance frequency of 110 KHz, the transmitted power is the largest. The farther the charging frequency is from the resonance frequency of 110 KHz, the larger the equivalent resistance Rp of the wireless charging device 11 is and the smaller the transmitted power is. That is, as Figure 4 shown, within the interval [110 KHz, 135 KHz], the transmitted power of the wireless charging device 11 is inversely related to the charging frequency.

[0102] In the wireless charging device 11, the processor 201 can control the charging frequency and the output voltage to adjust the transmitted power.

[0103] (c) Input current

[0104] Among them, the input current of the wireless charging device 11 can be the current input by the power supply chip 204 to the wireless charging chip 203, and this input current can be the current output by the power supply chip 204 to the wireless charging chip 203. Taking the resonance frequency of the wireless charging device 11 being 110 KHz as an example, when the charging frequency is increased within the interval [110 KHz, +∞], the input current will decrease. When the charging frequency is decreased, the input current will increase.

[0105] The processor 201 can monitor the input current and the charging frequency. When it is necessary to increase the transmitted power and the charging frequency has reached the minimum value, the input current can also reach the maximum value. If the processor 201 determines based on the monitored charging frequency reaching the minimum value and the input current reaching the maximum value, then the processor 201 controls the power supply chip 204 to increase the output voltage to increase the transmitted power.

[0106] (d) Duty cycle of the alternating current

[0107] In the embodiments of the present application, the duty cycle of the alternating current refers to the duty cycle of the alternating current output by the wireless charging chip 203. The larger the duty cycle, the greater the transmission power.

[0108] The wireless charging chip 203 can adjust the duty cycle of the alternating current according to the power adjustment signal. When the power adjustment signal indicates that the transmission power needs to be increased, the wireless charging chip 203 can increase the duty cycle to increase the transmission power. When the power adjustment signal indicates that the transmission power needs to be decreased, the wireless charging chip 203 can decrease the duty cycle to increase the transmission power.

[0109] (2) In-band communication

[0110] In the embodiments of the present application, the wireless charging device 11 and the wireless power receiving device 12 can interact through in-band communication. For example, after receiving the ping signal, the wireless power receiving device 12 feeds back a response signal to the wireless charging device 11 through in-band communication. The response signal can be an amplitude-modulated signal with a frequency of 2KHz. During the process of the wireless charging device 11 transmitting electrical energy to the wireless power receiving device 12, the wireless power receiving device 12 can also transmit a power adjustment signal to the wireless charging device 11 through in-band communication. In the in-band communication scenario, the power adjustment signal is also an amplitude-modulated signal with a frequency of 2KHz, which can be used to adjust parameters such as the transmission power and charging frequency of the wireless charging device 11. The principle of in-band communication is introduced below.

[0111] During the process of the wireless power receiving device 12 transmitting a communication signal to the wireless charging device 11, the wireless power receiving device 12 loads the communication signal on the energy signal, and the wireless charging device 11 can demodulate the communication signal from the energy signal. Specifically, in the wireless power receiving device 12, the wireless charging chip 203 can perform load modulation by switching a modulation resistor or a modulation capacitor to adjust the size of the load. The load therein can refer to the R in the example described in Figure 3 load . For example, a resistor or a capacitor is connected to the wireless charging chip 203 through a switch to change the size of the load R load . Since the load of the wireless power receiving device 12 changes, the amplitude of the voltage or current on the charging coil 202 of the wireless charging device 11 changes, and the amplitude of the voltage on the capacitor connected in series with the charging coil 202 also changes. The processor 201 can obtain the change value of the current amplitude through digital demodulation technology. Specifically, the voltage value on the capacitor can be detected through an RC circuit, and the voltage amplitude change can be obtained through an analog-to-digital converter (ADC), and the current amplitude change can be calculated. Therefore, the transmitted communication signal can be called an amplitude-modulated signal, and the frequency of the amplitude-modulated signal can be 2KHz. The change in the current amplitude can represent the transmitted communication signal. In this way, the signal can be transmitted from the wireless power receiving device 12 to the wireless charging device 11.​

[0112] In the embodiments of the present application, the above in-band communication complies with the regulations of various wireless charging protocols. Among them, the wireless charging protocol regulations include the Qi standard, the Power Matters Alliance (PMA) standard, the A4WP standard, etc.

[0113] In the embodiments of the present application, the wireless charging device 11 transmits signals to the wireless power receiving device 12 not limited to in-band communication, but also through other short-distance wireless communication methods, such as Bluetooth, Wi-Fi, Zigbee, etc. The wireless power receiving device 12 can broadcast the response signal or the power adjustment signal in the form of a Bluetooth broadcast. The Bluetooth module in the wireless charging device 11 can receive the Bluetooth broadcast and recognize the response signal or the power adjustment signal. Not limited to Bluetooth broadcast, it can also be Wi-Fi broadcast or other types of broadcasts. The embodiments of the present application do not limit this.

[0114] In order to reduce the situation that the chip of the wireless power receiving device is damaged due to excessive power during reverse charging and improve the convenience of reverse charging, the embodiments of the present application provide a method for wireless charging. The wireless charging device 11 can adjust the parameters of power transmission (including charging frequency, output voltage, duty cycle of alternating current) in a closed loop according to the power adjustment signal from the wireless power receiving device 12 to adjust the transmission power. A closed loop means that the wireless power receiving device 12 feeds back the power adjustment signal, the wireless charging device 11 adjusts the parameters of power transmission, and the wireless power receiving device 12 then feeds back according to the transmission power after adjusting the parameters. The following takes adjusting the charging frequency and output voltage as an example for introduction.

[0115] Specifically, the wireless charging device 11 performs reverse charging on the wireless power receiving device 12 with the charging frequency being the first frequency and the output voltage being the first voltage. When the wireless power receiving device 12 instructs the wireless charging device 12 to adjust the transmission power, the wireless charging device 11 adjusts the charging frequency to the extreme value to adjust the transmission power. The wireless charging device 11 can also adjust the charging voltage according to the input current and the current charging frequency being the extreme value.

[0116] Process of increasing the transmission power: When the power adjustment signal from the wireless power receiving device 12 indicates that the transmission power needs to be increased, the wireless charging device 11 can reduce the charging frequency to increase the transmission power. When the charging frequency is adjusted to the minimum value through closed-loop regulation and the input current is monitored to be the maximum value, the wireless charging device 11 increases the output voltage to increase the transmission power.

[0117] Process of reducing transmission power: When the power adjustment signal from the wireless power receiving device 12 indicates that the transmission power needs to be reduced, the wireless charging device 11 can increase the charging frequency to reduce the transmission power. When the charging frequency is adjusted to the maximum value through closed-loop regulation and the input current is monitored to be the minimum value, the wireless charging device 11 reduces the output voltage to reduce the transmission power.

[0118] In the wireless charging method provided by the embodiments of the present application, when the wireless power receiving device 12 requires a greater transmission power, the charging frequency and the output voltage can be adjusted through closed-loop regulation to increase the transmission power of the wireless charging device 11 and improve the speed of reverse charging. Conversely, when the wireless power receiving device 12 requires a smaller transmission power, the charging frequency and the output voltage can also be adjusted through closed-loop regulation to reduce the transmission power of the wireless charging device 11. In this way, the situation where the chip of the wireless power receiving device is damaged due to excessive power during reverse charging can be reduced, and the convenience of reverse charging is improved.

[0119] Based on Figure 2 the described system architecture and the above principle overview, the wireless charging method involved in the embodiments of the present application is introduced below. During the wireless charging process, first, the wireless charging device 11 and the wireless power receiving device 12 perform a handshake confirmation, and then the wireless charging device 11 and the wireless power receiving device 12 perform energy transfer. During the energy transfer process, the wireless charging device 11 can adjust the parameters of power transmission according to the power adjustment signal from the wireless power receiving device. The above two processes are introduced separately below.

[0120] (1) Process of handshake confirmation

[0121] Please refer to Figure 5 , Figure 5 which is a schematic flowchart of a wireless charging method provided by the embodiments of the present application. As Figure 5 shown, the wireless charging method provided by the embodiments of the present application may include steps S401 to S407.

[0122] S401: When reverse charging has not started, the power supply chip 204 and the wireless charging chip 203 in the wireless charging device 11 are in a sleep state.

[0123] Among them, when the power supply chip 204 and the wireless charging chip 203 are in a sleep state, the electric energy of the battery 205 is not supplied to the charging coil 202.

[0124] S402: The wireless charging device 11 receives a first user operation for starting reverse charging. In response to the first user operation, the processor 201 in the wireless charging device 11 wakes up the power supply chip 204 and the wireless charging chip 203.

[0125] The first user operation can be a user operation acting on the control displayed on the wireless charging device 11, or a pressing operation on a physical button. Among them, the above control can be located in the drop-down menu interface, or in the system settings interface, or in the negative first screen interface. Not limited to the first user operation, the signal triggering the processor to execute step S403 can also be a voice signal, a gesture signal, etc., which is not limited in the embodiments of the present application.

[0126] S403: The processor 201 controls the voltage output by the power supply chip 204 to be the set voltage.

[0127] In the embodiments of the present application, the power supply chip 204 can output voltage values including 5V, 6.8V, etc. according to the control of the processor 201.

[0128] S404: The processor 201 sends initialization parameters to the wireless charging chip 203.

[0129] Among them, the initialization parameters can include the charging frequency value range. In addition, the initialization parameters can also include OCP, OVP, the time interval for sending the ping signal, the duration for sending the ping signal, etc.

[0130] The wireless charging chip 203 can adjust the charging frequency according to the charging frequency value range to adjust the transmission power. For example, the charging frequency value range is the interval [110KHz, 135KHz]. The resonance frequency is 110KHz. When it is necessary to increase the transmission power, the wireless charging chip 203 can reduce the charging frequency within the value range. When it is necessary to reduce the transmission power, the wireless charging chip 203 can increase the charging frequency within the value range. The process of adjusting the charging frequency can refer to Figure 6 the described example.

[0131] In step S405, the wireless charging chip 203 can also use the time interval and duration of the ping signal in the initialization parameters to send the ping signal. For example, the duration of the ping signal is 120 seconds, and no more ping signals are sent after exceeding this duration. Return to the state of step S401. The time interval for sending the ping signal is 90 milliseconds.

[0132] S405: The wireless charging chip 203 sends a ping signal via the charging coil 202.

[0133] In the embodiments of the present application, the ping signal can be an energy signal with a fixed frequency. When the receiving coil 301 in the wireless power receiving device 12 is close enough to the charging coil 202, the energy of the ping signal received by the wireless power receiving device 12 is large enough, and the wireless power receiving device 12 can execute step S406 to feedback a response signal.

[0134] S406: In response to receiving a ping signal, the wireless power receiving device 12 feeds back a response signal.

[0135] In the embodiment of the present application, the wireless power receiving device 12 can feed back a response signal to the wireless charging device 11 through in-band communication. The response signal can be an amplitude-modulated signal with a frequency of 2KHz. Not limited to in-band communication, the response signal can also be transmitted through other short-range wireless communications. For example, the response signal is a broadcast signal sent through Bluetooth, Wi-Fi, etc.

[0136] S407: The wireless charging chip 203 transmits energy to the wireless power receiving device 12 via the charging coil 202.

[0137] (2) Process of adjusting parameters of power transmission

[0138] The principle of adjusting the parameters of power transmission to adjust the transmission power is outlined below with examples. Among them, the power transmission parameters can include the output voltage and the charging frequency. The charging frequency is inversely related to the transmission power, and the voltage is directly related to the transmission power.

[0139] For example, in the initialization parameters, the value range of the charging frequency is [110KHz, 135KHz]. The process of increasing the transmission power and the process of decreasing the transmission power are introduced separately.

[0140] (1) Process of increasing the transmission power

[0141] The current output voltage is the first voltage (for example, 5V), and the charging frequency is, for example, 135KHz. The wireless charging chip 203 receives a power adjustment signal via the charging coil 202. When the power adjustment signal indicates that the transmission power needs to be increased, the wireless charging chip 203 can decrease the charging frequency to increase the transmission power. After the wireless charging chip 203 adjusts the charging frequency, it also receives a power adjustment signal from the wireless power receiving device 12. If the power adjustment signal indicates that the adjusted transmission power still needs to be increased, the wireless charging chip 203 continues to decrease the charging frequency. In this way, the wireless power receiving device 12 feeds back a power adjustment signal, the wireless charging device 11 adjusts the parameters of power transmission, and the wireless power receiving device 12 feeds back according to the transmission power after adjusting the parameters. Through such a closed-loop regulation between the wireless charging device 11 and the wireless power receiving device 12, the transmission power of the wireless charging device 11 can meet the requirements of the wireless power receiving device 12.

[0142] The processor 201 can monitor the wireless charging chip 203 to obtain the current charging frequency of the wireless charging chip 203 and the current input from the power supply chip 204 to the wireless charging chip 203. In a possible implementation, the power supply chip 204 outputs a first voltage value to the wireless charging chip 203, the charging frequency of the wireless charging chip 203 reaches the minimum charging frequency corresponding to the first voltage value, and the current input from the power supply chip 204 to the wireless charging chip 203 reaches the maximum input current value corresponding to the first voltage value. If the wireless power receiving device 12 instructs the wireless charging device 11 to continue increasing the transmission power, the processor 201 can monitor that the charging frequency of the wireless charging chip 203 reaches the minimum charging frequency corresponding to the first voltage value, and the current input from the power supply chip to the wireless charging chip reaches the maximum input current value corresponding to the first voltage value. Then the processor 201 can control the power supply chip 204 to increase the charging voltage, for example, increase the charging voltage from the first voltage (5V) to the second voltage (for example, 6.8V), to increase the transmission power. After that, the wireless charging chip 203 continues to adjust the charging frequency according to the power adjustment signal from the wireless power receiving device 12 to adjust the transmission power.

[0143] (2) The process of reducing the transmission power

[0144] For example, the current charging voltage is the second voltage (for example, 6.8V), and the charging frequency is, for example, 130KHz. When the power adjustment signal indicates that the transmission power needs to be reduced, the wireless charging chip 203 can increase the charging frequency to reduce the transmission power.

[0145] In a possible implementation, the wireless charging device 11 needs to continue reducing the transmission power. After the wireless charging chip 203 adjusts the charging frequency to the maximum value of 135KHz, the received power adjustment signal can still indicate that the transmission power needs to be reduced. The processor 201 can monitor that the charging frequency is the maximum value of 135KHz, and the current input from the power supply chip 204 to the wireless charging chip 203 reaches the minimum input minimum value (for example, 0.4A) corresponding to the first voltage value. Then the processor 201 can control the power supply chip 204 to reduce the charging voltage, for example, reduce the charging voltage from the second voltage (6.8V) to the first voltage (for example, 5V), to reduce the transmission power. After that, the wireless charging chip 203 continues to adjust the charging frequency according to the power adjustment signal from the wireless power receiving device 12 to adjust the transmission power.

[0146] The process by which the processor 201 monitors and controls the adjustment of the output voltage is specifically introduced below. The processor 201 can store multiple output voltage values of the output voltage. The processor 201 also stores the charging frequency threshold of the wireless charging chip 203 corresponding to any output voltage value, and the current threshold input by the power supply chip 204 to the wireless charging chip 203 corresponding to any output voltage value. When it is monitored that at this voltage value, the charging frequency of the wireless charging chip 203 is the maximum value, and the current input by the power supply chip 204 to the wireless charging chip 203 is less than or equal to the minimum input current value corresponding to this voltage value, the processor 201 can notify the power supply chip 204 to decrease the voltage value of the output voltage. Similarly, when it is monitored that at this voltage value, the charging frequency is the minimum value, and the current input by the power supply chip 204 to the wireless charging chip 203 is greater than or equal to the maximum input current value corresponding to this voltage value, the processor 201 can notify the power supply chip 204 to increase the voltage value of the output voltage.

[0147] Exemplarily, the voltage values of the output voltage, the maximum and minimum values of the charging frequency, and the maximum and minimum values of the current input by the power supply chip 204 to the wireless charging chip 203 stored by the processor 201 can be referred to in Table 1. Table 1 is an example of the voltage values of the output voltage, the maximum and minimum values of the charging frequency, and the maximum and minimum values of the input current provided by the embodiments of the present application.

[0148] Table 1. Example of the voltage values of the output voltage, the maximum and minimum values of the charging frequency, and the maximum and minimum values of the input current

[0149]

[0150] As shown in Table 1, the processor 201 can store the maximum and minimum values of the charging frequency and the maximum and minimum values of the input current when the output voltages are 5V, 6.8V, and 9.9V respectively, and the voltage values at which the processor 201 controls the power supply chip 204 to switch under the corresponding parameters. Specifically, the processor 201 can poll the actual charging frequency value of the wireless charging chip 203 and the current value input by the power supply chip 204 to the wireless charging chip 203 every 100 milliseconds. When the output voltage value is 5V, when the processor 201 monitors that the actual frequency value is less than or equal to the minimum value of 110KHz shown in Table 1, and the actual current value is greater than or equal to the maximum input current value of 0.7A corresponding to 5V, the processor 201 can control the power supply chip 204 to adjust the output voltage from 5V to 6.8V.

[0151] When the output voltage value is 6.8V, when the processor 201 monitors that the actual frequency value is less than or equal to the minimum value of 110KHz shown in Table 1, and the current value input by the actual power supply chip 204 to the wireless charging chip 203 is greater than or equal to the maximum input current value of 0.8A corresponding to 6.8V, then the processor 201 can control the power supply chip 204 to adjust the output voltage from 6.8V to 9.9V. When the output voltage value is 6.8V, when the processor 201 monitors that the actual frequency value is greater than or equal to the maximum value of 135KHz shown in Table 1, and the current value input by the actual power supply chip 204 to the wireless charging chip 203 is less than or equal to the minimum input current value of 0.4A corresponding to 6.8V, then the processor 201 can control the power supply chip 204 to adjust the output voltage from 6.8V to 5V.

[0152] When the output voltage value is 9.9V, when the processor 201 monitors that the actual frequency value is greater than or equal to the maximum value of 135KHz shown in Table 1, and the actual current value is less than or equal to the minimum input current value of 0.5A corresponding to 9.9V, then the processor 201 can control the power supply chip 204 to adjust the output voltage from 9.9V to 6.8V.

[0153] In the embodiments of the present application, the maximum and minimum values of the charging frequency are the endpoints of the charging frequency value range in the initialization parameters. As shown in the example in Table 1, the charging frequency value range is [110KHz, 135KHz], that is, the maximum value of the charging frequency is 135KHz and the minimum value is 110KHz. After the initialization parameters are sent to the wireless charging chip 203, the wireless charging chip 203 can adjust the charging frequency within the range of [110KHz, 135KHz] to adjust the transmission power.

[0154] It can be understood that the values of the output voltage, charging frequency, and input current involved in the embodiments of the present application are only used to explain the embodiments of the present application and should not constitute a limitation. The output voltage, charging frequency, and input current can also be other values, and the embodiments of the present application do not limit this.

[0155] Based on the above parameter adjustment principle, the process of adjusting the parameters of power transmission to adjust the transmission power is introduced below with examples. Please refer to Figure 6 , Figure 6 is a flowchart of a wireless charging method provided by an embodiment of the present application. After the handshake confirmation process shown in Figure 5 is completed, energy transmission can be carried out between the wireless charging device 11 and the wireless power receiving device 12, and the transmission parameters can be adjusted. Figure 6 The process of adjusting the transmission parameters is shown in Figure 6 As shown in

[0156] S501: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the first power transmission parameter.

[0157] Among them, the first power transmission parameter includes the charging frequency F0, the output voltage V0, and the transmission power P0.

[0158] S502: The wireless power receiving device 12 sends a power adjustment signal to the wireless charging device 11, and the power adjustment signal indicates that the transmission power needs to be increased.

[0159] In the embodiment of the present application, the wireless power receiving device 12 can periodically send a power adjustment signal to the wireless charging device 11. For example, the wireless power receiving device 12 can send a power adjustment signal to the wireless charging device 11 every 150 ms.

[0160] S503: The wireless charging device 11 adjusts the power transmission parameter to the second power transmission parameter according to the power adjustment signal.

[0161] Among them, the second power parameter includes the charging frequency F1, the output voltage V0, and the transmission power P1. Among them, F1 < F0, P1 > P0. Please refer to Figure 7 , Figure 7 is a schematic diagram of adjusting the power transmission parameter provided by the embodiment of the present application. As Figure 7 shown, the horizontal and vertical coordinates are the output voltage U and the charging frequency F respectively. Point A represents that the power transmission parameter is the first power transmission parameter. When the power adjustment signal indicates that the transmission power needs to be increased, the wireless charging device 11 reduces the charging frequency. In the closed-loop adjustment process, the wireless charging device 11 can adjust the charging frequency to the minimum value F1, that is, the power transmission parameter represented by point B as shown in Figure 7 shown. The minimum value F1 of this charging frequency is the minimum value in the value range of the charging frequency stored in the wireless charging chip 203. As Figure 7 shown, the arrow from A to B represents the closed-loop adjustment process of the wireless charging device 11 adjusting the first power transmission parameter to the second power transmission parameter.

[0162] S504: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the second power transmission parameter.

[0163] S505: The wireless power receiving device 12 sends a power adjustment signal to the wireless charging device 11, and the power adjustment signal indicates that the transmission power needs to be increased.

[0164] S506: The wireless charging device 11 adjusts the power transmission parameter to the third power transmission parameter according to the power adjustment signal and the input current.

[0165] Among them, the third power parameter includes a charging frequency F1, an output voltage V1, and a transmission power P2. Among them, V1 > V0 and P2 > P1.

[0166] In the embodiment of the present application, step S506 is not limited to adjusting the power transmission parameter according to the power adjustment signal and the input current. When the charging frequency is less than or equal to the minimum value, the wireless charging device 11 can also adjust the power transmission parameter to the third power transmission parameter according to the power adjustment signal.

[0167] When the processor 201 in the wireless charging device 11 monitors that the charging frequency F1 is the minimum value and the current input by the power supply chip 204 to the wireless charging chip 203 is the maximum input current, the processor 201 can control the power supply chip 204 to increase the output voltage value from V0 to V1, and the corresponding power transmission parameter is the third power transmission parameter, that is, Figure 7 the power transmission parameter represented by point C shown in the figure. The arrow from B to C represents the closed-loop adjustment process of the wireless charging device 11 adjusting the second power transmission parameter to the third power transmission parameter.

[0168] S507: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the third power transmission parameter.

[0169] In the embodiment of the present application, after the parameter of power transmission is adjusted to the third power transmission parameter, if the received power adjustment signal indicates that there is no need to adjust the transmission power, the parameter is no longer adjusted currently. In another possible embodiment, after the parameter of power transmission is adjusted to the third power transmission parameter, the received power adjustment signal indicates that the transmission power needs to be reduced, then step S508 is executed.

[0170] S508: The wireless power receiving device 12 sends a power adjustment signal to the wireless charging device 11, and the power adjustment signal indicates that the transmission power needs to be reduced.

[0171] S509: The wireless charging device 11 adjusts the parameter of power transmission to the fourth power transmission parameter according to the power adjustment signal.

[0172] Among them, the fourth power parameter includes a charging frequency F2, an output voltage V1, and a transmission power P3. Among them, F2 > F1 and P3 < P2. As Figure 7 shown by point D representing the fourth power parameter. The arrow from C to D represents the closed-loop adjustment process of the wireless charging device 11 adjusting the third power transmission parameter to the fourth power transmission parameter.

[0173] S510: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the fourth power transmission parameter.

[0174] In the embodiment of the present application, at the initial stage of reverse charging, when the power in the wireless power receiving device 12 is low (for example, the power is less than 10%), the transmission power of the wireless charging device 11 can be increased through the process of steps S501 - S510 (or S501 - S507) to increase the speed of reverse charging.

[0175] In the embodiment of the present application, the first electronic device is the wireless charging device 11, and the second electronic device is the wireless power receiving device 12. The power supply circuit is the power supply chip 204, and the wireless charging circuit is the wireless charging chip 203.

[0176] In the embodiment of the present application, the first electronic device transmits a first wireless charging signal to the second electronic device in a wireless manner. The frequency of the first wireless charging signal is the first frequency, and the voltage of the first wireless charging signal is the first voltage. When the first electronic device transmits the first wireless charging signal to the second electronic device in a wireless manner, in response to a first power adjustment signal from the second electronic device, the first power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device transmits a second wireless charging signal to the second electronic device in a wireless manner. The frequency of the second wireless charging signal is the second frequency, the voltage of the second wireless charging signal is the first voltage, and the second frequency is less than the first frequency. When the first electronic device transmits the second wireless charging signal to the second electronic device in a wireless manner, the second frequency matches a first frequency threshold. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner. The voltage of the third wireless charging signal is the second voltage, and the second voltage is greater than the first voltage.

[0177] In the embodiment of the present application, in step S501, the energy signal output by the charging coil 202 is the first wireless charging signal. At this time, the output power is P0, the output voltage V0 is the first voltage, and the charging frequency P0 is the first frequency. The power adjustment signal in step S502 is the first power adjustment signal.

[0178] In response to the received first power adjustment signal, in step S503 above, the energy signal output by the charging coil 202 is the second wireless charging signal, and the charging frequency F1 in the second power transmission parameter is the second frequency.

[0179] In the embodiment of the present application, the fact that the second frequency matches the first frequency threshold means that the second frequency is less than or equal to the first frequency threshold. The first frequency threshold is the minimum value of the charging frequency, that is, the minimum value in the value range of the charging frequency.

[0180] In the embodiments of the present application, the frequency of the third wireless charging signal may be equal to the second frequency or may not be equal to the second frequency (for example, greater than the second frequency). The second power adjustment signal may include the power adjustment signal in step S505, indicating to increase the power of the wireless charging signal. In a possible implementation, the frequency of the third wireless charging signal may be equal to the second frequency, that is, the charging frequency F1, and the third wireless charging signal may include the energy signal output by the charging coil 202 in step S507. In another possible implementation, the frequency of the third wireless charging signal may be greater than the second frequency, and the third wireless charging signal may include the energy signal output by the charging coil 202 in step S510. In the embodiments of the present application, when the first electronic device transmits the first wireless charging signal and the second wireless charging signal to the second electronic device wirelessly, the power supply circuit inputs a first voltage to the wireless charging circuit. When the first electronic device transmits the third wireless charging signal to the second electronic device wirelessly, the power supply circuit inputs a second voltage to the wireless charging circuit.

[0181] Taking the start from the first power transmission parameter (V0, F0, P0) as an example, the process of reducing the transmission power is introduced below.

[0182] S511: The wireless power receiving device 12 sends a power adjustment signal to the wireless charging device 11, and the power adjustment signal indicates that the transmission power needs to be reduced.

[0183] S512: The wireless charging device 11 adjusts the parameters of the power transmission to the fifth power transmission parameter according to the power adjustment signal.

[0184] Among them, the fifth power parameter includes the charging frequency F3, the output voltage V0, and the transmission power P4. Among them, F3 > F0, P4 < P0. Please refer to Figure 8 , Figure 8 which is a schematic diagram of adjusting the parameters of power transmission provided by the embodiments of the present application. As Figure 8 shown, the horizontal and vertical coordinates are the output voltage U and the charging frequency F respectively. Point A represents that the parameters of the power transmission are the first power transmission parameter. When the power adjustment signal indicates that the transmission power needs to be reduced, the wireless charging device 11 increases the charging frequency. In the closed-loop adjustment process, the wireless charging device 11 can adjust the charging frequency to the maximum value F3, that is, the power transmission parameter represented by point E as Figure 8 shown. The maximum value F3 of this charging frequency is the maximum value in the value range of the charging frequency stored in the wireless charging chip 203. As Figure 8 shown, the arrow from A to E represents the closed-loop adjustment process of the wireless charging device 11 adjusting the first power transmission parameter to the fifth power transmission parameter.

[0185] S513: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the fifth power transmission parameter.

[0186] S514: The wireless power receiving device 12 sends a power adjustment signal to the wireless charging device 11, and the power adjustment signal indicates that the transmission power needs to be reduced.

[0187] S515: The wireless charging device 11 adjusts the parameters of power transmission to the sixth power transmission parameters according to the power adjustment signal and the input current.

[0188] Among them, the sixth power parameter includes the charging frequency F3, the output voltage V2, and the transmission power P5. Among them, V2 < V0, P5 < P4.

[0189] When the processor 201 in the wireless charging device 11 monitors that the charging frequency of the wireless charging chip 203 reaches the maximum value F3 and the current input by the power supply chip 204 to the wireless charging chip 203 reaches the minimum value, the wireless charging device 11 can adjust the output voltage from V0 to V2, and the corresponding power transmission parameter is the sixth power transmission parameter, that is Figure 8 The power transmission parameter represented by the F point shown. The arrow from E to F represents the closed-loop adjustment process of the wireless charging device 11 adjusting the fifth power transmission parameter to the sixth power transmission parameter.

[0190] In the embodiment of the present application, step S515 is not limited to adjusting the power transmission parameter according to the power adjustment signal and the input current. When the charging frequency is greater than or equal to the maximum value, the wireless charging device 11 can also adjust the power transmission parameter to the sixth power transmission parameter according to the power adjustment signal.

[0191] S516: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the sixth power transmission parameter.

[0192] In the embodiment of the present application, after adjusting the parameter of power transmission to the sixth power transmission parameter, if the received power adjustment signal indicates that the transmission power does not need to be adjusted, the parameter is no longer adjusted currently. In another possible embodiment, after adjusting the parameter of power transmission to the sixth power transmission parameter, the received power adjustment signal indicates that the transmission power needs to be increased, then step S517 is executed.

[0193] S517: The wireless power receiving device 12 sends a power adjustment signal to the wireless charging device 11, and the power adjustment signal indicates that the transmission power needs to be increased.

[0194] S518: The wireless charging device 11 adjusts the parameter of power transmission to the seventh power transmission parameter according to the power adjustment signal.

[0195] Among them, the seventh power parameter includes the charging frequency F4, the output voltage V2, and the transmission power P6. Among them, F4 < F3, P6 > P5. As Figure 8The seventh power parameter represented by the G point shown. The arrow from F to G represents the closed-loop regulation process in which the wireless charging device 11 adjusts the sixth power transmission parameter to the seventh power transmission parameter.

[0196] S519: The wireless charging device 11 transmits energy to the wireless power receiving device 12 with the seventh power transmission parameter.

[0197] In the embodiment of the present application, in the stage when the reverse charging is nearly finished, at this time the power in the wireless power receiving device 12 is higher than the set threshold (for example, the power is higher than 90%), the transmission power of the wireless charging device 11 can be reduced through the process of steps S511 to S519 (or S511 to S516).

[0198] During the wireless charging process, the wireless power receiving device 12 can periodically send a power adjustment signal to the wireless charging device 11. When the power adjustment signal indicates that there is no need to adjust the transmission power, the wireless charging device 11 can maintain the current power parameter.

[0199] In the embodiment of the present application, the wireless charging device 11 can adjust the charging frequency according to the demand from the wireless power receiving device 12 to adjust the transmission power. In addition, the wireless charging device 11 can also adjust the output voltage according to whether the current charging frequency and the current input from the power supply chip 204 to the wireless charging chip 203 both reach the maximum value, so as to adjust the transmission power. In this way, through the adjustment of the charging frequency and the output voltage, the power adjustment range of the wireless charging device 11 is increased. The wireless charging device 11 can timely adjust the parameters of power transmission, reduce the situation of damaging the chip of the wireless power receiving device 12 during reverse charging, and improve the convenience of reverse charging.

[0200] In the embodiment of the present application, the power adjustment signal in step S511 is the third power adjustment signal. In response to the received third power adjustment signal, in the above step S512, the energy signal output by the charging coil 202 is the fourth wireless charging signal, and the charging frequency F3 in the fifth power transmission parameter is the third frequency.

[0201] In the embodiment of the present application, the matching of the third frequency with the second frequency threshold means that the third frequency is greater than or equal to the second frequency threshold. The second frequency threshold is the maximum value of the charging frequency, that is, the maximum value in the value range of the charging frequency.

[0202] In the embodiments of the present application, the frequency of the fifth wireless charging signal may be equal to the third frequency or may not be equal to the third frequency (for example, less than the third frequency). The fourth power adjustment signal may include the power adjustment signal in step S514. In a possible implementation, the frequency of the fifth wireless charging signal may be equal to the third frequency, that is, the charging frequency F3, and the fifth wireless charging signal may include the energy signal output by the charging coil 202 in step S516. In another possible implementation, the frequency of the fifth wireless charging signal may be less than the third frequency, and the fifth wireless charging signal may include the energy signal output by the charging coil 202 in step S519.

[0203] When the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the power supply circuit inputs a first voltage to the wireless charging circuit. When the first electronic device wirelessly transmits the fifth wireless charging signal to the second electronic device, the power supply circuit inputs a third voltage to the wireless charging circuit.

[0204] In the embodiments of the present application, when the output voltage of the power supply chip 204 is a certain voltage value, the charging frequency is the minimum value (i.e., the first frequency threshold, for example, 110 KHz), and the current input by the power supply chip 204 to the wireless charging chip 203 is greater than or equal to the maximum current value corresponding to this voltage value, then the processor 201 increases the output voltage of the power supply chip 204 to increase the transmission power. Here, the maximum current value is the first current threshold. The current input by the power supply chip 204 to the wireless charging chip 203 matching the first current threshold means that the current input by the power supply chip 204 to the wireless charging chip 203 is greater than or equal to the first current threshold corresponding to this voltage value.

[0205] Similarly, when the output voltage of the power supply chip 204 is a certain voltage value, the charging frequency is the maximum value (i.e., the second frequency threshold, for example, 135 KHz), and the current input by the power supply chip 204 to the wireless charging chip 203 is less than or equal to the minimum current value corresponding to this voltage value, then the processor 201 decreases the output voltage of the power supply chip 204 to decrease the transmission power. Here, the minimum current value is the second current threshold. The current input by the power supply chip 204 to the wireless charging chip 203 matching the second current threshold means that the current input by the power supply chip 204 to the wireless charging chip 203 is less than or equal to the second current threshold corresponding to this voltage value.

[0206] In some other embodiments, during the reverse charging process, when the power of the wireless charging device 11 itself is lower than a set threshold (for example, lower than 30% of the remaining power), the processor 201 in the wireless charging device 11 may instruct to reduce the transmission power. By analogy with steps S511 - S519, the wireless charging chip 203 may also increase the charging frequency according to the instruction, and the power supply chip 204 may also reduce the output voltage according to the instruction to reduce the transmission power. In this way, during reverse charging, the situation where the wireless charging device 11 outputs too much power and affects the use is reduced, and the convenience of reverse charging is improved.

[0207] In some other embodiments, during the reverse charging process, when the proportion of the power output by the wireless charging device 11 in the total power is lower than a set threshold (for example, lower than 30%), the processor 201 in the wireless charging device 11 may instruct to reduce the transmission power. By analogy with steps S511 - S519, the wireless charging chip 203 may also increase the charging frequency according to the instruction, and the power supply chip 204 may also reduce the output voltage according to the instruction to reduce the transmission power. Among them, the proportion of the output power in the total power may be stored by the wireless charging device 11 in response to a user operation.

[0208] In some other embodiments of the present application, when the power adjustment signal indicates that the transmission power needs to be increased or decreased, the wireless charging chip 203 may also adjust the duty cycle of the alternating current. The value range of the duty cycle may also be sent by the processor 201 to the wireless charging chip 203. For example, when the transmission power needs to be increased, the wireless charging chip 203 may increase the duty cycle of the alternating current to increase the transmission power. When the transmission power needs to be decreased, the wireless charging chip 203 may decrease the duty cycle of the alternating current to decrease the transmission power.

[0209] In another possible embodiment, when the charging frequency has not reached the minimum value and the transmission power needs to be increased, the wireless charging chip 203 may reduce the charging frequency to increase the transmission power. When the charging frequency is at the minimum value and the power adjustment signal indicates that the transmission power needs to be increased, the wireless charging chip 203 increases the duty cycle of the alternating current. When the charging frequency has not reached the maximum value and the transmission power needs to be decreased, the wireless charging chip 203 may increase the charging frequency to decrease the transmission power. When the charging frequency is at the maximum value and the power adjustment signal indicates that the transmission power needs to be decreased, the wireless charging chip 203 decreases the duty cycle of the alternating current.

[0210] In another possible embodiment, a second wireless charging signal is transmitted between the wireless charging device 11 and the wireless power receiving device 12, and the duty cycle of the second wireless charging signal is a first duty cycle. The charging frequency (e.g., the second frequency) of the second wireless charging signal matches (i.e., is less than or equal to) the first frequency threshold (the minimum value). In response to a fifth power adjustment signal from the wireless power receiving device 12, which is used to indicate increasing the power of the wireless charging signal, the wireless charging device 11 transmits a sixth wireless charging signal to the second electronic device. The duty cycle of the sixth wireless charging signal is a second duty cycle, and the second duty cycle is greater than the first duty cycle. When the first electronic device wirelessly transmits the sixth wireless charging signal to the second electronic device, the second duty cycle matches the duty cycle threshold. In response to a second power adjustment signal from the second electronic device, which is used to indicate increasing the power of the wireless charging signal, the first electronic device transmits a third wireless charging signal to the second electronic device.

[0211] In the embodiments of the present application, the matching of the second duty cycle with the duty cycle threshold means that the second duty cycle is greater than or equal to the duty cycle threshold, and the duty cycle threshold is the maximum value of the duty cycle. In the embodiments of the present application, the initialization parameters may further include the value range of the duty cycle of the alternating current.

[0212] As can be seen from the above solution, when the wireless charging device 11 adjusts the power transmission parameters (charging frequency, duty cycle, and output voltage) to increase the transmission power, it first reduces the charging frequency to increase the transmission power. When the charging frequency is less than or equal to the minimum charging frequency value, the wireless charging device 11 increases the duty cycle of the alternating current to increase the transmission power. When the duty cycle of the alternating current is greater than or equal to the maximum duty cycle (i.e., the duty cycle threshold), the wireless charging device 11 increases the output voltage to increase the transmission power. In this way, when the wireless power receiving device 12 needs a greater transmission power, the charging frequency, the duty cycle of the alternating current, and the output voltage can be adjusted through closed-loop regulation to increase the transmission power of the wireless charging device 11 and improve the speed of reverse charging.

[0213] Conversely, when the wireless power receiving device 12 needs a smaller transmission power, the charging frequency, the duty cycle of the alternating current, and the output voltage can also be adjusted in sequence through closed-loop regulation to reduce the transmission power of the wireless charging device 11. In this way, the situation where the chip of the wireless power receiving device is damaged due to excessive power during reverse charging can be reduced, and the convenience of reverse charging is improved.

[0214] In another possible embodiment, the wireless charging device 11 increases the output voltage only when the charging frequency is at the minimum value, the duty cycle of the alternating current is at the maximum value, and the current input from the power supply chip 204 to the wireless charging chip 203 is at the maximum input current value. The wireless charging device 11 decreases the output voltage only when the charging frequency is at the maximum value, the duty cycle of the alternating current is at the minimum value, and the current input from the power supply chip 204 to the wireless charging chip 203 is at the minimum input current value.

[0215] In the embodiments of the present application, adjusting the transmission power may include two cases: one is that the power adjustment signal from the wireless power receiving device 12 indicates that the transmission power needs to be adjusted. The other is that the processor 201 in the wireless charging device 11 instructs the wireless charging chip to adjust the transmission power.

[0216] In the embodiments of the present application, the power adjustment signal can be sent through in-band communication or other short-range wireless communication methods. Among them, the power adjustment signal may include an 8-bit signed number, which can be used to indicate an increase or decrease in the transmission power. Exemplarily, if the signed number is positive, it indicates that the transmission power needs to be increased, indicating that the transmission power required by the wireless power receiving device 12 is greater than the current transmission power. If the signed number is negative, it indicates that the transmission power needs to be decreased, indicating that the transmission power required by the wireless power receiving device 12 is less than the current transmission power. If the signed number is 0, it indicates that the current transmission power needs to be maintained unchanged, indicating that the transmission power required by the wireless power receiving device 12 is equal to the current transmission power.

[0217] In the embodiments of the present application, during the process that the processor 201 monitors the charging frequency and input current of the wireless charging chip 203, when the duration that the charging frequency is less than or equal to the minimum value (for example, 110 KHz) exceeds the set threshold, the processor 201 can determine that the charging frequency is at the minimum value. Similarly, when the duration that the current input from the power supply chip 204 to the wireless charging chip 203 is greater than or equal to the minimum input current corresponding to the voltage (for example, 0.7 A) exceeds the set threshold (for example, 1 second), the processor 201 can determine that the input current is the maximum input current corresponding to the voltage. The processor 201 can control the power supply chip 204 to increase the charging voltage according to the monitored charging frequency of 110 KHz at the minimum value and the input current at the maximum value (for example, 0.7 A).

[0218] Similarly, for the charging frequency at the maximum value, the processor 201 can also determine it by monitoring that the duration greater than or equal to the maximum value exceeds the set threshold. For the input current at the minimum value, the processor 201 can also determine it by monitoring that the duration less than or equal to the minimum value corresponding to the output voltage exceeds the set threshold. Among them, the set thresholds corresponding to the charging frequency and the input current are not limited to 1 second, and can also be other values, which can be the same or different.

[0219] In another possible implementation, the processor 201 can determine whether the charging frequency and the input current reach the maximum or minimum values using the average value within a set time. Specifically, when it is monitored that the average value of the charging frequency within a set time (e.g., 1 second) is less than or equal to the minimum value (e.g., 110 KHz), the processor 201 can determine that the charging frequency is the minimum value. When it is monitored that the average value of the current input from the power supply chip 204 to the wireless charging chip 203 within a set time (e.g., 1 second) is greater than or equal to the maximum value of the input current (e.g., 0.7 A), the processor 201 can determine that the input current is the maximum value. Similarly, the maximum value of the charging frequency and the minimum value of the input current can be determined by the average value within a set time exceeding a set threshold.

[0220] Taking the charging voltage of the wireless charging device 11 having three different values as an example, the principle of adjusting the transmission power during reverse charging will be specifically described below.

[0221] Please refer to Figure 9 , Figure 9 which is a schematic diagram of parameters for adjusting power transmission provided by an embodiment of the present application. First, in combination with Figure 9 the process of increasing the transmission power according to the power adjustment signal from the wireless power receiving device 12 will be introduced. The process of increasing the transmission power is divided into the process of reducing the charging frequency to increase the transmission power and the process of increasing the output voltage to increase the transmission power, which will be introduced separately below.

[0222] (1) Process of reducing the charging frequency to increase the transmission power

[0223] The process of reducing the charging frequency to increase the transmission power can be analogized to Figure 6 the steps S501 - S502 in the described embodiment. As Figure 9 shown, the current power transmission parameters of the wireless charging device 11 are the charging frequency F0, the output voltage V0, and the transmission power P0. As Figure 9 shown, point A represents the current power transmission parameters of the wireless charging device 11. The power adjustment signal from the wireless power receiving device 12 indicates that the transmission power needs to be increased. The wireless charging chip 203 can reduce the charging frequency to increase the transmission power. After the wireless charging chip 203 adjusts the charging frequency, it also receives the power adjustment signal from the wireless power receiving device 12. If the power adjustment signal indicates that the adjusted transmission power still needs to be increased, the wireless charging chip 203 continues to reduce the charging frequency.

[0224] In this way, the wireless power receiving device 12 feeds back a power adjustment signal, the wireless charging device 11 adjusts the parameters of power transmission, and the wireless power receiving device 12 then feeds back according to the transmitted power after adjusting the parameters. Through such a closed-loop regulation between the wireless charging device 11 and the wireless power receiving device 12, the transmitted power is increased. Until the wireless charging chip 203 reduces the charging frequency to the minimum value F5, the processor 201 can monitor that the charging frequency is this minimum value F5.

[0225] As Figure 9 shown, the H point represents the power transmission parameters of the wireless charging device 11 when the charging frequency reaches the minimum value, and the transmitted power is P7. Among them, F5 < F0 and P7 > P0. After that, the wireless charging device 11 can increase the output voltage to increase the transmitted power. The arrow from A to H represents the closed-loop regulation process in which the wireless charging device 11 adjusts the power transmission parameters (F0, V0, P0) to the power transmission parameters (F5, V0, P7).

[0226] (2) Process of increasing the output voltage to increase the transmitted power

[0227] The processor 201 can monitor that the charging frequency is the minimum value F5, and the current input by the power supply chip 204 to the wireless charging chip 203 is the maximum value of the input current corresponding to V0. Then the processor 201 can control the power supply chip 204 to increase the charging voltage, for example, increase the charging voltage from V0 to V3 to increase the transmitted power.

[0228] As Figure 9 shown, the I point represents the power transmission parameters of the wireless charging device 11 when the charging voltage is increased to V3, and the transmitted power is P8. Among them, V3 > V0 and P8 > P7. The arrow from H to I represents the adjustment process in which the wireless charging device 11 adjusts the power transmission parameters (F5, V0, P7) to the power transmission parameters (F5, V3, P8).

[0229] When the power transmission parameters are in the situation of the I point, when the wireless charging chip 203 receives a power adjustment signal indicating that the transmitted power needs to be reduced, the wireless charging chip 203 increases the charging frequency to reduce the transmitted power. This process can refer to Figure 6 the steps S508 - S509 in the described embodiment. As Figure 9 shown, the arrow from I to J represents the closed-loop regulation process in which the wireless charging device 11 increases the charging frequency of the power transmission parameters (F5, V3, P8) to reduce the transmitted power.

[0230] When the parameters of power transmission are at point I, when the processor 201 monitors that the charging frequency is F5 and the input current from the power supply chip 204 to the wireless charging chip 203 is the maximum input current corresponding to V3, the processor 201 can notify the power supply chip 204 to increase the voltage value of the output voltage. The power supply chip 204 can increase the output voltage from V3 to V4. As Figure 9 shown, point K represents the parameters of power transmission of the wireless charging device 11 when the charging voltage is increased to V4, and the transmission power is P9. Among them, V4 > V3 and P9 > P8. The arrow from I to K represents the adjustment process of the wireless charging device 11 to adjust the power transmission parameters (F5, V3, P8) to the power transmission parameters (F5, V4, P9).

[0231] Combined with Figure 9 the described embodiments, the wireless charging signal transmitted according to the charging parameter represented by point A is the first wireless charging signal. The wireless charging signal transmitted according to the charging parameter represented by point H is the second wireless charging signal. In one case, the wireless charging signal transmitted according to the charging parameter represented by point I is the third wireless charging signal. In another case, the wireless charging signal transmitted according to the charging parameter represented by point K is the third wireless charging signal.

[0232] Secondly, combined with Figure 9 introduce the process of reducing the transmission power according to the power adjustment signal from the wireless power receiving device 12. The process of reducing the transmission power is divided into the process of increasing the charging frequency to reduce the transmission power and the process of reducing the output voltage to reduce the transmission power, which will be introduced separately below.

[0233] (1) The process of increasing the charging frequency to reduce the transmission power

[0234] The process of increasing the charging frequency to reduce the transmission power can be analogous to Figure 6 steps S511 - S512 in the described embodiments. As Figure 9 shown, the current power transmission parameters of the wireless charging device 11 are (F5, V4, P9). The power adjustment signal from the wireless power receiving device 12 indicates that the transmission power needs to be increased. The wireless charging chip 203 can increase the charging frequency to reduce the transmission power. After the wireless charging chip 203 increases the charging frequency, it also receives the power adjustment signal from the wireless power receiving device 12. If the power adjustment signal indicates that the adjusted transmission power still needs to be reduced, the wireless charging chip 203 continues to increase the charging frequency.

[0235] In this way, the wireless power receiving device 12 feeds back a power adjustment signal, and the wireless charging device 11 adjusts the parameters of power transmission. Then, the wireless power receiving device 12 feeds back according to the transmitted power after the adjustment of the parameters. Through such a closed-loop regulation between the wireless charging device 11 and the wireless power receiving device 12, the transmitted power is reduced until the wireless charging chip 203 increases the charging frequency to the maximum value F6, and the processor 201 can monitor that the charging frequency is this maximum value F6.

[0236] As Figure 9 shown, point O represents the power transmission parameters of the wireless charging device 11 when the charging frequency reaches the maximum value, and the transmitted power is P10. Among them, F6 > F5 and P10 < P9. After that, the wireless charging device 11 can reduce the output voltage to reduce the transmitted power. The arrow from K to O represents the closed-loop regulation process in which the wireless charging device 11 adjusts the power transmission parameters (F0, V4, P9) to the power transmission parameters (F6, V4, P10).

[0237] (2) Process of reducing the output voltage to reduce the transmitted power

[0238] The processor 201 can monitor that the charging frequency is the maximum value F6, and the current input by the power supply chip 204 to the wireless charging chip 203 is the minimum input current corresponding to V4. Then, the processor 201 can control the power supply chip 204 to reduce the charging voltage, for example, reduce the charging voltage from V4 to V3, to adjust and reduce the transmitted power.

[0239] As Figure 9 shown, point P represents the power transmission parameters of the wireless charging device 11 when the charging voltage is reduced to V3, and the transmitted power is P11. Among them, V3 < V4 and P11 < P10. The arrow from O to P represents the closed-loop regulation process in which the wireless charging device 11 adjusts the power transmission parameters (F6, V4, P10) to the power transmission parameters (F6, V3, P11).

[0240] When the power transmission parameters are in the situation of point P, when the wireless charging chip 203 receives a power adjustment signal indicating that the transmitted power needs to be increased, the wireless charging chip 203 reduces the charging frequency to increase the transmitted power. This process can refer to steps S517 - S518 in the embodiment described in Figure 6 and the arrow from F to G described in Figure 8 As Figure 9 shown, the arrow from P to Q represents the closed-loop regulation process in which the wireless charging device 11 reduces the charging frequency of the power transmission parameters (F6, V3, P11) to increase the transmitted power.

[0241] For the parameters of power transmission in the case of point P, when the processor 201 monitors that the charging frequency is the maximum value F6 and the current input by the power supply chip 204 to the wireless charging chip 203 is the minimum input current corresponding to V3, the processor 201 can notify the power supply chip 204 to reduce the voltage value of the output voltage. The power supply chip 204 can reduce the output voltage from V3 to V0. As Figure 9 shown, point R represents the parameters of power transmission of the wireless charging device 11 when the charging voltage is reduced to V0, and the transmitted power is P12. Among them, V0 < V3, P12 < P11. The arrow from P to R represents the closed-loop adjustment process of the wireless charging device 11 to adjust the power transmission parameters (F6, V3, P11) to the power transmission parameters (F6, V0, P12).

[0242] The above Figure 9 In the described transmitted power adjustment process, the wireless charging device 11 can adjust the charging frequency within the charging frequency value range [F5, F6] according to the requirements from the wireless power receiving device 12 to adjust the transmitted power. In addition, the wireless charging device 11 can also adjust the output voltage among the three values of V0, V3, and V4 according to whether the current charging frequency and the input current both reach the maximum or minimum values, so as to adjust the transmitted power. In this way, by adjusting the charging frequency and the output voltage, the power adjustment range of the wireless charging device 11 is increased. The wireless charging device 11 can timely adjust the parameters of power transmission, reduce the situation of damaging the chip of the wireless power receiving device 12 during reverse charging, and improve the convenience of reverse charging.

[0243] It can be understood that in the embodiments of the present application, the charging voltage having two or three different values is taken as an example for introduction, but the embodiments of the present application do not limit the number of values of the charging voltage. The embodiments of the present application are equally applicable to wireless charging devices with more than three values of the charging voltage.

[0244] It can be understood that the embodiments of the present application are introduced by taking reverse charging as an example, but the embodiments of the present application are not limited to the scenario of reverse charging, and other scenarios can also be used, for example, the scenario where a charging dock performs wireless charging for an electronic device. That is, in the embodiments of the present application, the charging dock is the wireless charging device 11, and the electronic device is the wireless power receiving device 12. In addition, not limited to wireless charging, the embodiments of the present application can also be applicable to the scenario where the wireless charging device 11 performs wired charging for the wireless power receiving device 12.

[0245] Next, an exemplary electronic device provided in the embodiments of the present application is introduced. This electronic device can be the wireless charging device 11 in the embodiments of the present application.

[0246] Figure 10 The structural schematic diagram of the electronic device 100 is shown.

[0247] The following takes the electronic device 100 as an example to specifically illustrate the embodiments. It should be understood that the structure schematically shown in the embodiments of the present invention does not constitute a specific limitation on the electronic device 100. The electronic device 100 may have more or fewer components than those shown in the figure, may combine two or more components, or may have different component configurations. The various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and / or application specific integrated circuits.

[0248] The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an indicator 192, and a display screen 194.

[0249] The electronic device 100 may further include a power supply chip 204, a wireless charging chip 203, and a charging coil 202.

[0250] The processor 110 may include one or more processing units. For example, the processor 110 may include an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0251] Among them, the controller may be the nerve center and command center of the electronic device 100. The controller may generate operation control signals according to the instruction operation code and timing signal to complete the control of fetching and executing instructions.

[0252] A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. This memory may save the instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can directly call it from the memory. This avoids repeated accesses, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0253] In some embodiments, the processor 110 may include one or more interfaces. The interfaces may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0254] In the embodiments of the present application, the processor 110 can be used to implement Figure 2 the functions of the processor 201 in the described embodiments.

[0255] It can be understood that the interface connection relationships between the modules illustrated in the embodiments of the present application are only illustrative descriptions and do not constitute a structural limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0256] The charging management module 140 can be used to receive a charging input from a charger. Among them, the charger can be a wireless charger or a wired charger. In some embodiments of wired charging, the charging management module 140 can receive the charging input of the wired charger through the USB interface 130. In some embodiments of wireless charging, the charging management module 140 can receive the wireless charging input through the wireless charging coil of the electronic device 100. While charging the battery 142, the charging management module 140 can also supply power to the electronic device through the power management module 141.

[0257] The charging management module 140 can also be used to output the electrical energy of the battery 142 to other electronic devices. For example, the electrical energy of the battery 142 can be used to charge the wireless power receiving device 12 reversely. Among them, the charging management module 140 can charge the power receiving device reversely in a wired or wireless manner. In the wired manner, the charging management module 140 can output electrical energy to the power receiving device through the USB interface 130. In the wireless manner, the charging management module 140 can also be connected to the power supply chip 204, and the power supply chip 204, the wireless charging chip 203, and the charging coil 202 are connected in sequence (refer to Figure 2 the described example). The wireless charging device 11 realizes the transmission of energy to the wireless power receiving device 12 through the path of the battery 142, the charging management module 140, the power supply chip 204, the wireless charging chip 203, and the charging coil 202.

[0258] In the embodiment of the present application, the battery 142 can be used to implement Figure 2 the functions of the battery 205 in the described embodiment.

[0259] The power management module 141 is used to connect the battery 142, the charging management module 140, and the processor 110. The power management module 141 receives the inputs of the battery 142 and / or the charging management module 140 and supplies power to the processor 110, the internal memory 121, the external memory, the display screen 194, the camera 193, the wireless communication module 160, etc. The power management module 141 can also be used to monitor parameters such as the battery capacity, the number of battery cycles, and the battery health status (leakage, impedance). In some other embodiments, the power management module 141 can also be set in the processor 110. In some other embodiments, the power management module 141 and the charging management module 140 can also be set in the same device.

[0260] The display screen 194 is used to display images, videos, etc. The display screen 194 includes a display panel. The display panel can adopt a liquid crystal display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (AMOLED), a flexible light-emitting diode (FLED), a Miniled, a MicroLed, a Micro-oLed, a quantum dot light-emitting diode (QLED), etc. In some embodiments, the electronic device 100 may include one or N display screens 194, where N is a positive integer greater than 1. The indicator 192 can be an indicator light, which can be used to indicate the charging state, the change in battery power, and can also be used to indicate messages, missed calls, notifications, etc.

[0261] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement the data storage function. For example, files such as music and videos are saved in the external memory card.

[0262] The internal memory 121 can be used to store computer-executable program code, and the executable program code includes instructions. The processor 110 executes various functional applications and data processing of the electronic device 100 by running the instructions stored in the internal memory 121. The internal memory 121 can include a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as a sound playback function, an image playback function, etc.). The data storage area can store data created during the use of the electronic device 100 (such as audio data, a phone book, etc.). In addition, the internal memory 121 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0263] The above has introduced the solution provided by the embodiments of the present application from the perspective of the method implemented by the electronic device. It can be understood that in order to implement the above functions, each network element, such as an electronic device, a processor, etc., includes the corresponding hardware structure and / or software module for executing each function. Those skilled in the art should easily realize that, in combination with the network elements and algorithm steps of each example described in the embodiments disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the way of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described function for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0264] The embodiments of the present application can perform the division of function modules on electronic devices, imaging devices, etc. according to the above method examples. For example, each function module can be divided corresponding to each function, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware or in the form of a software function module. It should be noted that the division of modules in the embodiments of the present application is illustrative, only a logical function division, and there can be other division methods in actual implementation.

[0265] The embodiments of the present application also provide a computer-readable storage medium. All or part of the processes in the above method embodiments can be completed by a computer program instructing relevant hardware. This program can be stored in the above computer storage medium. When this program is executed, it can include the processes of the above method embodiments. The computer-readable storage medium includes various media that can store program codes, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0266] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk (SSD)), etc.

[0267] The steps in the method embodiments of the present application can be adjusted, combined, and deleted according to actual needs.

[0268] The modules in the device embodiments of the present application can be combined, divided, and deleted according to actual needs.

[0269] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wireless charging method, characterized in that, the method includes: The first electronic device transmits a first wireless charging signal to the second electronic device wirelessly. The frequency of the first wireless charging signal is a first frequency, and the voltage of the first wireless charging signal is a first voltage; When the first electronic device transmits the first wireless charging signal to the second electronic device wirelessly, in response to a first power adjustment signal from the second electronic device, the first power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device transmits a second wireless charging signal to the second electronic device wirelessly. The frequency of the second wireless charging signal is a second frequency, the voltage of the second wireless charging signal is the first voltage, and the second frequency is less than the first frequency; When the first electronic device transmits the second wireless charging signal to the second electronic device wirelessly, the second frequency matches a first frequency threshold, the first frequency threshold is the minimum charging frequency corresponding to the first voltage. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device transmits a third wireless charging signal to the second electronic device wirelessly. The voltage of the third wireless charging signal is a second voltage, and the second voltage is greater than the first voltage.

2. The method according to claim 1, characterized in that, the method further includes: When the first electronic device transmits the first wireless charging signal to the second electronic device wirelessly, in response to a third power adjustment signal from the second electronic device, the third power adjustment signal is used to indicate decreasing the power of the wireless charging signal. The first electronic device transmits a fourth wireless charging signal to the second electronic device wirelessly. The frequency of the fourth wireless charging signal is a third frequency, the voltage of the fourth wireless charging signal is the first voltage, and the third frequency is greater than the first frequency.

3. The method according to claim 2, characterized in that, the method further includes: When the first electronic device transmits the fourth wireless charging signal to the second electronic device wirelessly, the third frequency matches a second frequency threshold. In response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate decreasing the power of the wireless charging signal. The first electronic device transmits a fifth wireless charging signal to the second electronic device wirelessly. The voltage of the fifth wireless charging signal is a third voltage, and the third voltage is less than the first voltage. The second frequency threshold is greater than the first frequency threshold.

4. The method according to claim 3, characterized in that, The first electronic device includes a power supply circuit and a wireless charging circuit, and the power supply circuit provides voltage to the wireless charging circuit; When the first electronic device wirelessly transmits the first wireless charging signal, the second wireless charging signal, or the fourth wireless charging signal to the second electronic device, the power supply circuit inputs the first voltage to the wireless charging circuit; When the first electronic device wirelessly transmits the third wireless charging signal to the second electronic device, the power supply circuit inputs the second voltage to the wireless charging circuit; When the first electronic device wirelessly transmits the fifth wireless charging signal to the second electronic device, the power supply circuit inputs the third voltage to the wireless charging circuit.

5. The method according to claim 4, wherein, when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matches a first frequency threshold, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal being used to indicate increasing the power of the wireless charging signal, the first electronic device wirelessly transmitting the third wireless charging signal to the second electronic device, includes: when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matches a first frequency threshold, the current input by the power supply circuit to the wireless charging circuit matches a first current threshold, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal being used to indicate increasing the power of the wireless charging signal, the first electronic device wirelessly transmitting the third wireless charging signal to the second electronic device.

6. The method according to claim 4, wherein, when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the third frequency matches a second frequency threshold, in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal being used to indicate decreasing the power of the wireless charging signal, the first electronic device wirelessly transmitting the fifth wireless charging signal to the second electronic device, includes: when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the third frequency matches a second frequency threshold, the current input by the power supply circuit to the wireless charging circuit matches a second current threshold, in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal being used to indicate decreasing the power of the wireless charging signal, the first electronic device wirelessly transmitting the fifth wireless charging signal to the second electronic device.

7. The method according to claim 3, wherein, the first frequency threshold is 110 KHz, and the second frequency threshold is 135 KHz.

8. The method according to any one of claims 1 to 3, wherein, The duty cycle of the second wireless charging signal is a first duty cycle. When the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matches a first frequency threshold. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device wirelessly transmits a third wireless charging signal to the second electronic device, including: When the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matches a first frequency threshold. In response to a fifth power adjustment signal from the second electronic device, the fifth power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device wirelessly transmits a sixth wireless charging signal to the second electronic device, and the duty cycle of the sixth wireless charging signal is a second duty cycle, and the second duty cycle is greater than the first duty cycle; When the first electronic device wirelessly transmits the sixth wireless charging signal to the second electronic device, the second duty cycle matches a duty cycle threshold. In response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal. The first electronic device wirelessly transmits a third wireless charging signal to the second electronic device.

9. The method according to any one of claims 1 to 3, characterized in that the first power adjustment signal and the second power adjustment signal are sent through in-band communication, or the first power adjustment signal and the second power adjustment signal are Bluetooth signals from the second electronic device.

10. An electronic device, characterized in that the electronic device is a first electronic device, and the first electronic device includes: one or more processors, a battery, a power supply circuit, a wireless charging circuit, and a charging coil; the battery supplies power to the wireless charging circuit through the power supply circuit, and the wireless charging circuit emits a wireless charging signal through the charging coil; the processor is respectively connected to the power supply circuit and the wireless charging circuit; wherein: the wireless charging circuit is configured to transmit a first wireless charging signal to a second electronic device through the charging coil according to a first voltage provided by the power supply circuit, and the frequency of the first wireless charging signal is a first frequency; the wireless charging circuit is further configured to, when transmitting the first wireless charging signal to the second electronic device through the charging coil, in response to a first power adjustment signal from the second electronic device, transmit a second wireless charging signal to the second electronic device through the charging coil, the frequency of the second wireless charging signal is a second frequency, the voltage of the second wireless charging signal is the first voltage, and the second frequency is less than the first frequency; the processor is configured to obtain the second frequency; When the second frequency matches the first frequency threshold, where the first frequency threshold is the minimum charging frequency corresponding to the first voltage, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal being used to indicate increasing the power of the wireless charging signal, the processor is further configured to instruct the power supply circuit to provide a second voltage to the wireless charging circuit, the second voltage being greater than the first voltage; The wireless charging circuit is further configured to transmit a third wireless charging signal to the second electronic device through the charging coil according to the second voltage provided by the power supply circuit.

11. The electronic device according to claim 10, wherein, The wireless charging circuit is further configured to, when transmitting the first wireless charging signal to the second electronic device through the charging coil, in response to a third power adjustment signal from the second electronic device, the third power adjustment signal being used to indicate decreasing the power of the wireless charging signal, transmit a fourth wireless charging signal to the second electronic device through the charging coil, the fourth wireless charging signal having a frequency of a third frequency, the fourth wireless charging signal having a voltage of the first voltage, and the third frequency being greater than the first frequency.

12. The electronic device according to claim 11, wherein, The wireless charging circuit is further configured to, when transmitting the fourth wireless charging signal to the second electronic device through the charging coil, the third frequency matching a second frequency threshold, in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal being used to indicate decreasing the power of the wireless charging signal, transmit a fifth wireless charging signal to the second electronic device through the charging coil, the fifth wireless charging signal having a voltage of a third voltage, the third voltage being less than the first voltage, and the second frequency threshold being greater than the first frequency threshold.

13. The electronic device according to claim 12, wherein, When the wireless charging circuit transmits the first wireless charging signal, the second wireless charging signal, or the fourth wireless charging signal to the second electronic device through the charging coil, the power supply circuit inputs the first voltage to the wireless charging circuit; When the wireless charging circuit transmits the third wireless charging signal to the second electronic device through the charging coil, the power supply circuit inputs the second voltage to the wireless charging circuit; When the wireless charging circuit transmits the fifth wireless charging signal to the second electronic device through the charging coil, the power supply circuit inputs the third voltage to the wireless charging circuit.

14. The electronic device according to claim 13, wherein, The wireless charging circuit is specifically configured to: When transmitting the second wireless charging signal to the second electronic device through the charging coil, the second frequency matches a first frequency threshold, the current input by the power supply circuit to the wireless charging circuit matches a first current threshold, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, and a third wireless charging signal is transmitted to the second electronic device through the charging coil.

15. The electronic device according to claim 13, wherein, the wireless charging circuit is specifically configured to: when transmitting the fourth wireless charging signal to the second electronic device through the charging coil, the third frequency matches a second frequency threshold, the current input by the power supply circuit to the wireless charging circuit matches a second current threshold, in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to indicate decreasing the power of the wireless charging signal, and a fifth wireless charging signal is transmitted to the second electronic device through the charging coil.

16. The electronic device according to claim 12, wherein, the first frequency threshold is 110KHz, and the second frequency threshold is 135KHz.

17. The electronic device according to any one of claims 10 to 12, wherein, the duty cycle of the second wireless charging signal is a first duty cycle, and the wireless charging circuit is specifically configured to: when transmitting the second wireless charging signal to the second electronic device through the charging coil, the second frequency matches the first frequency threshold, in response to a fifth power adjustment signal from the second electronic device, the fifth power adjustment signal is used to indicate increasing the power of the wireless charging signal, and a sixth wireless charging signal is transmitted to the second electronic device through the charging coil, the duty cycle of the sixth wireless charging signal is a second duty cycle, and the second duty cycle is greater than the first duty cycle; when transmitting the sixth wireless charging signal to the second electronic device through the charging coil, the second duty cycle matches a duty cycle threshold, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal is used to indicate increasing the power of the wireless charging signal, and a third wireless charging signal is transmitted to the second electronic device through the charging coil.

18. The electronic device according to any one of claims 10 to 12, wherein, the first power adjustment signal and the second power adjustment signal are sent through in-band communication and are received by the wireless charging circuit, or the electronic device further includes a Bluetooth module, the first power adjustment signal and the second power adjustment signal are Bluetooth signals from the second electronic device, and the first power adjustment signal and the second power adjustment signal are received by the Bluetooth module.

19. A charging system, wherein, the charging system includes a first electronic device and a second electronic device, wherein: The first electronic device wirelessly transmits a wireless charging signal to the second electronic device; The second electronic device is configured to send a power adjustment signal to the first electronic device when receiving the wireless charging signal transmitted by the first electronic device wirelessly; The first electronic device is configured to perform the wireless charging method according to any one of claims 1 to 9.

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