CN113328478A

CN113328478A - Wireless charging method, electronic equipment and charging system

Info

Publication number: CN113328478A
Application number: CN202010132421.5A
Authority: CN
Inventors: 袁兵; 郑志勇; 崔瑞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-02-29
Filing date: 2020-02-29
Publication date: 2021-08-31

Abstract

A wireless charging method, an electronic device and a charging system are provided. In the method, a first electronic device transmits a first wireless charging signal to a second electronic device with a charging frequency as a first frequency and an output voltage as a first voltage. When the second electronic device instructs the first electronic device to turn up the transmission power, the first electronic device decreases the charging frequency to turn up 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. By implementing the technical scheme, the flexibility of adjusting the wireless charging power is improved.

Description

Wireless charging method, electronic equipment and charging system

Technical Field

The present disclosure relates to the field of electronic technologies, and in particular, to a wireless charging method, an electronic device, and a charging system.

Background

In recent years, wireless charging technology (wireless charge technology) has become widely used in electronic devices. The wireless charging technology can be applied to a scene that the charging base charges the electronic equipment, and can also be applied to a scene that the wireless charging equipment such as a mobile phone reversely charges other electronic equipment. Under the reverse charging scene, wireless charging equipment such as cell-phone can transmit the electric energy in self battery to wireless powered device such as bluetooth headset through wireless mode.

Currently, most wireless charging technologies utilize electromagnetic induction to achieve power transmission. When wireless charging is carried out, the wireless charging equipment converts electric energy in a battery of the wireless charging equipment into alternating current and generates a magnetic field by using a charging coil. The magnetic field couples to a power receiving coil in a close-proximity wireless power receiving device, which generates electrical energy. The power can be supplied to the wireless power receiving device.

However, when reverse charging is performed, the power output by the wireless charging device may be excessive, damaging the chip in the wireless powered device.

Disclosure of Invention

The embodiment of the application provides a wireless charging method, electronic equipment and a charging system, so that the situation that a chip of wireless powered equipment is damaged due to overlarge power in reverse charging is reduced, and the convenience of reverse charging is improved.

In a first aspect, the present application provides a wireless charging method, including: the method comprises the steps that a first electronic device transmits a first wireless charging signal to a second electronic device in a wireless mode, wherein 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, responding to a first power adjusting signal from the second electronic device, wherein the first power adjusting signal is used for indicating to increase the power of a 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 smaller than the first frequency; when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency is matched with the first frequency threshold, the second power adjustment signal is used for indicating to increase the power of the wireless charging signal in response to the second power adjustment signal from the second electronic device, the first electronic device wirelessly transmits a third wireless charging signal to the second electronic device, the voltage of the third wireless charging signal is a second voltage, and the second voltage is greater than the first voltage.

Implementing the method provided in the first aspect, the first electronic device may adjust the transmission power by adjusting the charging frequency according to a demand 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 transmitting power. In this way, the power adjustment range of the first electronic device is increased by the adjustment of the charging frequency and the output voltage. The first electronic equipment can adjust the power transmission parameters in time, the condition that a chip of the second electronic equipment is damaged during reverse charging is reduced, and the convenience of reverse charging is improved.

The second frequency is matched with the first frequency threshold, which means that the second frequency is less than or equal to the first frequency threshold.

Two methods of determining that the second frequency is less than or equal to the first frequency threshold are described below: (1) when the current charging frequency (second frequency) is continuously less than or equal to the first frequency threshold (i.e. the minimum value of the frequency) within the 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 in the first set time is smaller than or equal to the first frequency threshold, the second frequency is smaller than or equal to the first frequency threshold.

In this embodiment, the first frequency threshold and the second frequency threshold may be sent to the wireless charging circuit by a processor in the first electronic device. Specifically, when the first electronic device receives a user operation for starting reverse charging, the processor in the first electronic device may wake up the wireless charging circuit and issue the initialization parameter to the wireless charging circuit.

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

Wherein the second electronic device may periodically transmit the power adjustment signal to the first electronic device, for example, once every 150 ms. The power adjustment signal may indicate to increase the transmit power, decrease the transmit power, or not change the transmit power.

In combination with the first aspect, in some embodiments, the method further comprises: when the first electronic device transmits the first wireless charging signal to the second electronic device in a wireless manner, responding to a third power adjustment signal from the second electronic device, wherein the third power adjustment signal is used for indicating to reduce the power of the wireless charging signal, the first electronic device transmits a fourth wireless charging signal to the second electronic device in a wireless manner, 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.

In combination with the first aspect, in some embodiments, the method further comprises: when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the third frequency is matched with a second frequency threshold, the fourth power adjustment signal is used for instructing to reduce the power of the wireless charging signal in response to a fourth power adjustment signal from the second electronic device, 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 a third voltage, the third voltage is smaller than the first voltage, and the second frequency threshold is larger than the first frequency threshold.

With reference to the first aspect, in some embodiments, the first electronic device includes a power supply circuit and a wireless charging circuit, the power supply circuit providing a voltage to the wireless charging circuit; when the first electronic device transmits the first wireless charging signal, the second wireless charging signal or the fourth wireless charging signal to the second electronic device in a wireless mode, the power supply circuit inputs the first voltage to the wireless charging circuit; when the first electronic device transmits the third wireless charging signal to the second electronic device in a wireless mode, the power supply circuit inputs the second voltage to the wireless charging circuit; when the first electronic device transmits the fifth wireless charging signal to the second electronic device in a wireless manner, the power supply circuit inputs the third voltage to the wireless charging circuit.

The power supply circuit is also used for boosting the voltage output by the battery. The power supply circuit may be implemented by a boost circuit.

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 may include a DC-AC circuit for converting direct current output by the power supply circuit into alternating current. The wireless charging circuit may include one or more of the following circuits that enable dc to ac conversion: full-bridge inverter circuit, half-bridge inverter circuit. The wireless charging circuit may include other inverter circuits for converting direct current into alternating current, which is not limited in the embodiments of the present application.

In combination with the first aspect, in some embodiments, the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency matching the first frequency threshold, in response to a second power adjustment signal from the second electronic device, the second power adjustment signal indicating to increase 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 transmits the second wireless charging signal to the second electronic device in a wireless manner, the second frequency is matched with the first frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with the first current threshold, the second power adjusting signal is used for indicating to increase the power of the wireless charging signal in response to the second power adjusting signal from the second electronic device, and the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner.

The current input by the power supply circuit to the wireless charging circuit is matched with the first current threshold, which 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.

Two methods of determining that the current is greater than or equal to the first current threshold are described below: (1) the current input to the wireless charging circuit by the power supply circuit is continuously greater than or equal to the first current threshold value within a second set time. (2) The average value of the current input to the wireless charging circuit by the power supply circuit in the second set time is greater than or equal to the first current threshold.

With reference to 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, and in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used to instruct to reduce the power of the wireless charging signal, the first electronic device wirelessly transmits a fifth wireless charging signal to the second electronic device, including: when the first electronic device transmits the fourth wireless charging signal to the second electronic device in a wireless manner, the third frequency is matched with the second frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with the second current threshold, in response to a fourth power adjusting signal from the second electronic device, the fourth power adjusting signal is used for indicating to reduce the power of the wireless charging signal, and the first electronic device transmits a fifth wireless charging signal to the second electronic device in a wireless manner.

The current input by the power supply circuit to the wireless charging circuit is matched with the second current threshold, which 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.

In this embodiment of the application, the first current threshold and the second current threshold may also be carried in the initialization parameter, and sent to the wireless charging circuit by the processor in the first electronic device. The values of the first current threshold and the second current threshold may be different when the output voltage is different. Illustratively, 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.

With reference to the first aspect, in some embodiments, the duty cycle of the second wireless charging signal is a first duty cycle, 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 instruct to increase the power of the wireless charging signal, and 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, where the second frequency is matched with the 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 instruct to increase the power of the wireless charging signal, the first electronic device wirelessly transmits a sixth wireless charging signal to the second electronic device, where a 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 transmits the sixth wireless charging signal to the second electronic device in a wireless manner, the second duty cycle is matched with the duty cycle threshold, the second electronic device responds to a second power adjustment signal from the second electronic device, the second power adjustment signal is used for indicating to increase the power of the wireless charging signal, and the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner.

The second duty cycle is matched with the duty cycle threshold, which means that the second duty cycle is greater than or equal to the duty cycle threshold.

Wherein the duty cycle threshold is a maximum value of the duty cycle. In this embodiment, the initialization parameter may further include a value interval of a duty ratio of the alternating current. The value interval of the duty ratio can comprise the maximum value and the minimum value of the duty ratio.

In other embodiments, the wireless charging circuit may decrease the charging frequency to increase the transmit power when the charging frequency has not reached a minimum value and the transmit power needs to be increased. When the charging frequency is the minimum value and the power adjusting signal indicates that the transmitting power needs to be increased, the wireless charging circuit increases the duty ratio of the alternating current. When the charging frequency does not reach the maximum value and the transmission power needs to be reduced, the wireless charging circuit can increase the charging frequency to turn down the transmission power. When the charging frequency is at a maximum value and the power adjustment signal indicates that the transmission power needs to be reduced, the wireless charging circuit reduces the duty ratio of the alternating current.

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

With reference to the first aspect, in some embodiments, the first power adjustment signal, the second power adjustment signal are transmitted via in-band communication, or the first power adjustment signal, the second power adjustment signal are bluetooth signals from the second electronic device.

Specifically, in an in-band communication scenario, the first power adjustment signal and the second power adjustment signal may be amplitude modulation signals with a frequency of 2KHz received by the wireless charging circuit. Under the bluetooth communication scene, first electronic equipment and second electronic equipment all contain bluetooth module, and this first power adjustment signal, second power adjustment signal are sent to the bluetooth module of second electronic equipment.

The power adjustment signal may include an 8-bit symbol number, which may be used to indicate an increase or decrease in transmit power. Illustratively, a positive number of the symbols 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. A negative sign number indicates that the transmission power needs to be reduced, indicating that the transmission power required by the second electronic device is less than the current transmission power. A symbol number of 0 indicates that the current transmit power needs to be maintained, indicating that the transmit power required by the second electronic device is equal to the current transmit power.

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 remaining power), the processor in the first electronic device may instruct to reduce the transmission power. The wireless charging circuit can also increase the charging frequency according to the instruction, and the power supply circuit can also reduce the output voltage according to the instruction so as to reduce the transmitting power. Thus, when the wireless charging device 11 is reversely charged, the situation that the use is influenced by the output of excessive electric quantity of the wireless charging device is reduced, and the convenience of reverse charging is improved.

In other embodiments, during the charging process, when the ratio of the amount of power output by the first electronic device to the total amount of power is lower than a set threshold (e.g., lower than 30%), the processor in the first electronic device may instruct to reduce the transmission power. The wireless charging circuit can also increase the charging frequency according to the instruction, and the power supply circuit can also reduce the output voltage according to the instruction so as to reduce the transmitting power. Wherein the proportion of the output power to the total power may be stored by the first electronic device in response to a user operation.

In a second aspect, the present application provides an electronic device, which is a first electronic device, including: one or more processors, a battery, power supply circuitry, wireless charging circuitry, 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 with the power supply circuit and the wireless charging circuit; wherein: the wireless charging circuit is used for transmitting a first wireless charging signal to the second electronic equipment through the charging coil according to the 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 transmit a second 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 when the first wireless charging signal is transmitted to the second electronic device through the charging coil, where a frequency of the second wireless charging signal is a second frequency, a voltage of the second wireless charging signal is the first voltage, and the second frequency is smaller than the first frequency; the processor is configured to obtain the second frequency; when the second frequency matches the first frequency threshold, the processor is further configured to instruct the power supply circuit to provide a second voltage to the wireless charging circuit, where the second voltage is greater than the first voltage; the wireless charging circuit is further used for transmitting 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.

The electronic device provided by the second aspect is a first electronic device, and the first electronic device may adjust the transmission power by adjusting a charging frequency according to a demand from a second electronic device. In addition, the first electronic device can also adjust the output voltage according to the current charging frequency to adjust the transmitting power. In this way, the power adjustment range of the first electronic device is increased by the adjustment of the charging frequency and the output voltage. The first electronic equipment can adjust the power transmission parameters in time, the condition that a chip of the second electronic equipment is damaged during reverse charging is reduced, and the convenience of reverse charging is improved.

With reference to the second aspect, in some embodiments, the wireless charging circuit is further configured to transmit a fourth wireless charging signal to the second electronic device through the charging coil, where the fourth wireless charging signal has a third frequency and the fourth wireless charging signal has the first voltage, and the third frequency is greater than the first frequency, in response to a third power adjustment signal from the second electronic device when the first wireless charging signal is transmitted to the second electronic device through the charging coil.

In combination with the second aspect, in some embodiments, the wireless charging circuit is further configured to, when the fourth wireless charging signal is transmitted to the second electronic device through the charging coil, match the third frequency with 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 instruct to reduce the power of the wireless charging signal, transmit a fifth wireless charging signal to the second electronic device through the charging coil, the voltage of the fifth wireless charging signal is a third voltage, the third voltage is smaller than the first voltage, and the second frequency threshold is larger than the first frequency threshold.

With reference to 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.

With reference to the second aspect, in some embodiments, the wireless charging circuit is specifically configured to: when the second wireless charging signal is transmitted to the second electronic device through the charging coil, the second frequency is matched with the first frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with the first current threshold, the second power adjustment signal is used for indicating the power of the wireless charging signal to be increased in response to the second power adjustment signal from the second electronic device, and the third wireless charging signal is transmitted to the second electronic device through the charging coil.

With reference to the second aspect, in some embodiments, the wireless charging circuit is specifically configured to: when the fourth wireless charging signal is transmitted to the second electronic device through the charging coil, the third frequency is matched with a second frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with a second current threshold, a fourth power adjusting signal from the second electronic device is responded, the fourth power adjusting signal is used for indicating that the power of the wireless charging signal is reduced, and a fifth wireless charging signal is transmitted to the second electronic device through the charging coil.

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

With reference to the second aspect, in some embodiments, the duty cycle of the second wireless charging signal is a first duty cycle, and the wireless charging circuit is specifically configured to: when the second wireless charging signal is transmitted to the second electronic device through the charging coil, the second frequency is matched with a first frequency threshold, a fifth power adjustment signal is responded to from the second electronic device, the fifth power adjustment signal is used for indicating to increase the power of the wireless charging signal, a sixth wireless charging signal is transmitted to the second electronic device through the charging coil, the duty ratio of the sixth wireless charging signal is a second duty ratio, and the second duty ratio is larger than the first duty ratio;

when the sixth wireless charging signal is transmitted to the second electronic device through the charging coil, the second duty cycle is matched with the duty cycle threshold, the second power adjustment signal is used for indicating to increase the power of the wireless charging signal in response to a second power adjustment signal from the second electronic device, and a third wireless charging signal is transmitted to the second electronic device through the charging coil.

In some embodiments, in combination with the second aspect, the first power adjustment signal and the second power adjustment signal are transmitted via in-band communication, and the first power adjustment signal and the second power adjustment signal 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 the first power adjustment signal and the second power adjustment signal are received by the bluetooth module.

In a third aspect, the present application provides a charging system comprising a first electronic device and a second electronic device, wherein: the first electronic equipment transmits a wireless charging signal to the second electronic equipment in a wireless mode; the second electronic device is used for sending a power adjusting signal to the first electronic device when receiving a wireless charging signal transmitted by the first electronic device in a wireless mode; the first electronic device is configured to execute the first aspect or the wireless charging method provided by any implementation manner of the first aspect.

In a fourth aspect, an embodiment of the present application provides a computer storage medium, which includes computer instructions, and when the computer instructions are run on an electronic device, the electronic device is caused to execute the wireless charging method provided in the first aspect of the embodiment of the present application or any implementation manner of the first aspect.

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

It is to be understood that the electronic device provided by the second aspect, the charging system provided by the third aspect, the computer storage medium provided by the fourth aspect, and the computer program product provided by the fifth aspect are all configured to execute the wireless charging method provided by the first aspect, and therefore, the beneficial effects achieved by the electronic device provided by the second aspect can refer to the beneficial effects in the wireless charging method provided by the first aspect, and are not described herein again.

Drawings

Fig. 1 is a schematic diagram of a reverse charging system provided in an embodiment of the present application;

fig. 2 is a schematic structural diagram of the wireless charging apparatus 11 and the wireless power receiving apparatus 12;

fig. 3 is a schematic diagram of an equivalent circuit structure of a charging system according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating a relationship between a transmission power and a charging frequency according to an embodiment of the present application;

fig. 5 is a schematic flowchart of a wireless charging method according to an embodiment of the present disclosure;

fig. 6 is a schematic flowchart of a wireless charging method according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of adjusting a parameter of power transmission according to an embodiment of the present application;

fig. 8 is a schematic diagram of adjusting a parameter of power transmission according to an embodiment of the present application;

fig. 9 is a schematic diagram of adjusting a parameter of power transmission according to an embodiment of the present application;

fig. 10 is a schematic structural diagram of an electronic device 100 according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described in detail and clearly with reference to the accompanying drawings. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" in the text is only an association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: three cases of a alone, a and B both, and B alone exist, and in addition, "a plurality" means two or more than two in the description of the embodiments of the present application.

In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of embodiments of the application, unless stated otherwise, "plurality" means two or more.

First, a reverse charging scenario according to an embodiment of the present application will be described. Referring to fig. 1, fig. 1 is a schematic diagram of a reverse charging system according to an embodiment of the present disclosure. As shown in fig. 1, the reverse charging system may include a wireless charging device 11 and a wireless powered device 12. The wireless charging apparatus 11 can charge the wireless powered apparatus 12. Specifically, the wireless charging apparatus 11 may convert electric energy in its own battery into alternating current and generate a magnetic field using a coil. The magnetic field couples to a coil in the wireless powered device 12 in close proximity, which generates electrical energy.

The area 102 on the housing of the wireless charging device 11 is an 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 apparatus 11, the power receiving coil in the wireless power receiving apparatus 12 is disposed opposite to the charging coil. When reverse charging is performed, the power receiving coil of the wireless power receiving apparatus 12 approaches the area 102. For example, the wireless power receiving apparatus 12 is in contact with the area 102 on the housing of the wireless charging apparatus 11. The magnetic field generated by the charging coil of the wireless charging device 11 couples to the power receiving coil, thereby realizing that the wireless charging device 11 performs reverse charging to the wireless power receiving device 12.

It can be understood that, the embodiment of the present application is not limited to the wireless charging by the above-mentioned electromagnetic induction, but may also implement the wireless charging by other manners, for example, energy transmission in the wireless charging process is implemented by electromagnetic waves, microwaves, and the like, which is not limited in the embodiment of the present application. In addition, the embodiment of the present application is not limited to the above-described reverse charging scenario, and may also be applied to a scenario in which a charging base (wireless charger) charges a power receiving device such as a mobile phone.

In this embodiment of the 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, an in-vehicle device, a virtual reality device, and an intelligent home device, and may also be a functional module installed on or running on the electronic device. The wireless powered device 12 may be a mobile phone, a cordless phone, a smart watch, a wireless headset, 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 device connected to a wireless modem, and may also be a functional module installed or operated on the above-mentioned device.

The principle of the wireless charging device 11 charging the wireless powered device 12 reversely is described below with reference to the schematic structural diagram of the device. Referring to fig. 2, fig. 2 is a schematic structural diagram of the wireless charging apparatus 11 and the wireless powered apparatus 12. The internal modules and functions of the wireless charging device 11 and the wireless power receiving device 12 are described below with reference to fig. 2.

(1) Wireless charging device 11

As shown in fig. 2, 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. Wherein:

the processor 201 is operable to wake up the power supply chip 204 and the wireless charging chip 203 from a sleep state to a power-on state in response to a user operation for starting reverse charging. The processor 201 may also issue an initialization parameter to the wireless charging chip 203, where the initialization parameter may include a charging frequency range. The charging frequency is the frequency of the alternating current output by the wireless charging chip 203. In addition, the initialization parameters may further include an Over Current Protection (OCP), an Over Voltage Protection (OVP), a time interval of sending a packet explorer (ping) signal, a duration of sending a ping signal, and the like.

The processor 201 may also store a plurality of output voltage values, such as: 5V, 6.8V and 9.9V. The voltage value that the processor 201 controls the power supply chip 204 to output may be any one of the plurality of output voltage values, for example: the output voltage value is 6.8V. The processor 201 also stores a charging frequency threshold of the wireless charging chip 203 corresponding to any output voltage value and a current threshold input to the wireless charging chip 203 by the power supply chip 204 corresponding to any output voltage value. As shown in table one below. The charging frequency threshold value comprises at least a maximum charging frequency value or a minimum charging frequency value. The current threshold value input by the power supply chip 204 to the wireless charging chip 203 at least includes a maximum input current value or a minimum input current value.

When the power supply chip 204 outputs a first voltage value (e.g., 6.8V) to the wireless charging chip 203, the processor 201 monitors that the charging frequency of the wireless charging chip 203 reaches a 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 a minimum input current value corresponding to the first voltage value, the processor 201 may notify the power supply chip 204 to decrease the voltage value of the output voltage.

Similarly, when the power supply chip 204 outputs a first voltage value (e.g., 6.8V) to the wireless charging chip 203, the processor 201 monitors that the charging frequency of the wireless charging chip 203 reaches a 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 a maximum input current value corresponding to the first voltage value, the processor 201 may notify the power supply chip 204 to increase the voltage value of the output voltage.

The processor 201 may include one or more processing units, such as: 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. The different processing units may be separate devices or may be integrated into one or more processors.

The power supply chip 204 may output the power of the battery 205 to the wireless charging chip 203 after powering on. The power supply chip 204 is also used for boosting the voltage output by the battery 205. The power supply chip 204 may be controlled by the processor 201 to increase or decrease the output voltage of the power supply chip 204. The processor 201 may control the power supply chip 204 to increase or decrease the output voltage of the power supply chip 204. For example, the processor 201 may 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 may also control the power supply chip 204 to reduce the output voltage of the power supply chip 204 from 6.8V to 5V. The power supply chip 204 may be implemented by a boost (boost) circuit.

The wireless charging chip 203 can send a probing signal (e.g., ping signal) via the charging coil 202 according to the initialization parameters issued by the processor 201. When the distance between the wireless powered device 12 and the charging coil 202 is close enough, the wireless powered device 12 receives the sounding signal. The wireless powered device 12 feeds back a response signal to the wireless charging chip 203, so that the wireless charging device 11 successfully handshakes with the wireless powered device 12 and starts to transmit the power of the battery 205 to the wireless powered device 12. For example, the initialization parameter may include a voltage value of 5V and a charging frequency interval of 110-. The processor 201 may 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, where the ping signal may be an ac energy signal with a frequency of 135KHz, where the frequency of the ping signal is within the charging frequency span.

The response signal fed back by wireless powered device 12 may be an amplitude modulated signal transmitted by in-band communication at a frequency of 2 KHz. The response signal fed back by the wireless power receiving device may also be a response signal fed back by another short-range wireless communication method, and the communication method for feeding back the response signal is not limited in the embodiments of the present application.

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 may receive a power adjustment signal from the wireless powered device 12 via the charging coil 202 and adjust a charging frequency according to the power adjustment signal to adjust the transmission power.

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

The charging coil 202 is used to generate a magnetic field using 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 the magnetic field, the magnetic field may couple into the power receiving coil 301, converting the energy in the magnetic field into electrical energy for use by the wireless power receiving device 12. The magnetic field coupling to the power receiving coil 301 may utilize the principle of electromagnetic induction.

Alternatively, the wireless charging chip 203 and the power supply chip 204 may be integrated on one chip, which may be referred to as a transmitting chip in this embodiment of the application.

The processor 201, the wireless charging coil 202, the wireless charging chip 203, the power supply chip 204 and the battery 205 may be implemented separately as a plurality of circuits, or may be combined together to form a chip, and the present application does not limit the combination structure of each functional module in the wireless charging device. In the embodiment of the present application, the wireless charging chip 203 and the power supply chip 204 may be collectively referred to as a transmitting chip.

(2) Wireless power receiving apparatus 12

As shown in fig. 2, the wireless powered device 12 may include a power receiving coil 301, a wireless power receiving chip 302, a processor 303, and a battery 304. Wherein:

when the wireless powered device 12 approaches the inductive region 102 of the wireless charging device 11, for example, the wireless powered device 12 is placed on the wireless charging device 11 and is contacted by the inductive region 102, the magnetic field generated by the charging coil 202 may couple into the power receiving coil 301. The power receiving coil 301 may generate electric energy.

The wireless power receiving chip 302 is configured to receive the electric energy generated by the power receiving coil 301 and perform processing, such as ac-to-dc conversion, rectification, and voltage stabilization. The battery 304 may be charged with the power output by the wireless power receiving chip 302.

The battery 304 may be used to receive and store power from the wireless power receiving chip 302 and may also supply power to the power consumers in the wireless power receiving device 12.

When the wireless powered device 12 is placed on the inductive region 102 of the wireless charging device 11, the magnetic field generated by the charging coil 202 couples to the power receiving coil 301. The wireless power receiving chip 302 may receive the ping signal via the power receiving coil 301. The wireless power receiving chip 302 may feed back a response signal to the wireless charging apparatus 11 through in-band communication. The response signal is for example an amplitude modulated signal with a frequency of 2 KHz. Reference is made to the following description regarding the principles of in-band communication.

The response signal is not limited to being fed back by the in-band communication described above, and the wireless power receiving apparatus 12 may also feed back the response signal by other short-range wireless communication methods. For example, the wireless powered device 12 and the wireless charging device 11 may each include a bluetooth module for transmitting the response signal and the power adjustment signal through bluetooth communication. As another example, the wireless powered device 12 and the wireless charging device 11 may each include a Wi-Fi module configured to transmit the response signal and the power adjustment signal via Wi-Fi communication.

It should be understood that the wireless charging device 11 and the wireless powered device 12 may have more or fewer components than those shown in the figures, may combine two or more components, or may have different configurations of components. The various components shown in the figures 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.

The principle of adjusting the transmission power and the communication principle according to the embodiment of the present application will be described with reference to fig. 2.

(1) Transmission power of wireless charging device 11

In the embodiment 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 larger the transmission power of the wireless charging apparatus 11, the faster the charging speed of the wireless powered apparatus 12. The transmission power of the wireless charging apparatus 11 is adjusted according to the power adjustment signal from the wireless powered apparatus 12. The parameters related to the transmitted power may include output voltage, charging frequency, input current, and duty cycle of the alternating current. The wireless charging apparatus 11 may 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 described below.

(a) Output voltage

The output voltage of the wireless charging device 11 is a dc voltage output by the output terminal of the power supply chip 204. The transmission power is positively correlated with the output voltage of the wireless charging apparatus 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 within the range of 3.5 to 4.4V. The voltage value is input to the power supply chip 204, and the output voltage after boosting is 5V or 6.8V.

(b) Frequency of charging

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, the charging coil 202 in the wireless charging device 11 may be connected in series with a capacitor to form an oscillating circuit. When the charging coil 202 in the wireless charging device 11 resonates with the capacitor, the frequency of the alternating current output by the wireless charging chip 203 (i.e., the charging frequency) is the resonant frequency. At this resonance frequency, the equivalent resistance of the wireless charging device 11 is minimum. The equivalent resistance may refer to Rp in the example described in fig. 3. The relation P ═ U between the equivalent impedance Rp and the transmitting power²As can be seen from/Rp, the equivalent impedance Rp is the smallest at the resonant frequency, and therefore the transmission power of the wireless charging device 11 is the largest at this resonant frequency.

Referring to fig. 3, fig. 3 is a schematic diagram of an equivalent circuit structure of a charging system according to an embodiment of the present disclosure. Fig. 3 may be an equivalent circuit structure diagram of the structure diagram shown in fig. 2. The capacitance in series with the charging coil 202 and the capacitance in series with the receiving coil 301 in the configuration shown in fig. 2 are not shown.

As shown in fig. 3, on the wireless charging device 11 side, the input power of the input oscillation circuit is the power output by the wireless charging chip 203. The current input to the oscillation circuit is I1, and I1 is the current output by the wireless charging chip 203. The self-inductance of the charging coil 202 is Lp, the capacitance in series with the charging coil 202 is Cp, and the equivalent resistance of the wireless charging device 11 is Rp.

On the wireless power receiving device 12 side, the self-inductance value of the power receiving coil 301 is Ls, the capacitance value in series with the power receiving coil 301 is Cs, and the equivalent resistance is Rs. The impedance of the load is R_load。

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

Illustratively, the resonant frequency of the wireless charging device 11 may be 110 KHz. When the charging frequency is equal to the resonance frequency, the equivalent impedance Rp is minimal. The relation P ═ U between the equivalent impedance Rp and the transmitting power²and/Rp shows that when the charging frequency is equal to the resonant frequency of 110KHz, the equivalent impedance Rp is minimum, and the transmitting power is maximum.

Referring to fig. 4, fig. 4 is a schematic diagram illustrating a relationship between a transmission power and a charging frequency according to an embodiment of the present disclosure. As shown in fig. 4, the resonant frequency of the wireless charging device 11 is 110 KHz. The transmission power is maximum when the charging frequency is equal to the resonant frequency of 110 KHz. The farther the charging frequency is from the resonance frequency of 110KHz, the larger the equivalent resistance Rp of the wireless charging apparatus 11 is, and the smaller the transmission power is. That is, as shown in fig. 4, the transmission power of the wireless charging device 11 is inversely related to the charging frequency in the interval [110KHz, 135KHz ].

In the wireless charging device 11, the processor 201 may control the charging frequency and the output voltage to adjust the transmission power.

(c) Input current

The input current of the wireless charging device 11 may be a current input by the power supply chip 204 to the wireless charging chip 203, and the input current may be a current output by the power supply chip 204 to the wireless charging chip 203. The resonant frequency of the wireless charging device 11 is 110KHz as an example, and when the charging frequency is adjusted to be large in the interval [110KHz, + ∞ ], the input current decreases. When the charging frequency is adjusted small, the input current increases.

The processor 201 may monitor the input current and the charging frequency. The input current may also reach a maximum value when the transmit power needs to be increased and the charging frequency has reached a minimum value. The processor 201 may control the power supply chip 204 to increase the output voltage to increase the transmitting power when the monitored charging frequency reaches the minimum value and the input current reaches the maximum value.

(d) Duty ratio of alternating current

In the embodiment of the present application, the duty ratio of the alternating current refers to the duty ratio of the alternating current output by the wireless charging chip 203. The larger the duty cycle, the larger the transmit power.

The wireless charging chip 203 can adjust the duty ratio of the alternating current according to the power adjustment signal. When the power adjustment signal indicates that the transmit power needs to be increased, the wireless charging chip 203 may adjust the duty cycle to increase the transmit power. When the power adjustment signal indicates that the transmit power needs to be reduced, the wireless charging chip 203 may decrease the duty cycle to increase the transmit power.

(2) In-band communication

In the embodiment of the present application, the wireless charging apparatus 11 and the wireless powered apparatus 12 may interact through in-band communication. For example, the wireless powered device 12 feeds back a response signal to the wireless charging device 11 through in-band communication after receiving the ping signal. The response signal may be an amplitude modulated signal having a frequency of 2 KHz. In the process of the wireless charging apparatus 11 transmitting power to the wireless powered apparatus 12, the wireless powered apparatus 12 may also transmit a power adjustment signal to the wireless charging apparatus 11 through in-band communication. In the in-band communication scenario, the power adjustment signal is also an amplitude modulation signal with a frequency of 2KHz, and may be used to adjust parameters such as the transmission power and the charging frequency of the wireless charging device 11. The principle of in-band communication is described below.

During the transmission of the communication signal from the wireless powered device 12 to the wireless charging device 11, the wireless powered device 12 loads the communication signal on the energy signal, and the wireless charging device 11 may demodulate the communication signal from the energy signal. Specifically, in the wireless powered device 12, the wireless charging chip 203 may perform load modulation by switching a modulation resistor or a modulation capacitor to adjust the size of the load. Wherein the load may refer to R of the example depicted in FIG. 3_load. For example, a resistor or a capacitor is switched into the wireless charging chip 302 through a switch to change the load R_loadThe size of (2). As the load of the wireless powered device 12 changes, the amplitude of the voltage or current on the charging coil 202 of the wireless charging device 11 changes, as does the amplitude of the voltage on the capacitor in series with the charging coil 202. The processor 201 may obtain the value of the change in the amplitude of the current through a digital demodulation technique. Specifically, the voltage value on the capacitor can be detected through the RC circuit, and the voltage amplitude change is obtained through an analog-to-digital converter (ADC), and the current amplitude change is calculated. The communication signal thus transmitted may be referred to as an amplitude modulated signal, which may be at a frequency of 2 KHz. The change in the current amplitude may be indicative of the transmitted communication signal. In this way, transmission of a signal from the wireless powered device 12 to the wireless charging device 11 can be achieved.

In the embodiment of the present application, the in-band communication conforms to the specifications of each wireless charging protocol. The wireless charging protocol specification includes Qi standard, power association (PMA) standard, A4WP standard, and the like.

In this embodiment, the signal transmitted by the wireless charging device 11 to the wireless powered device 12 is not limited to in-band communication, but may also be transmitted in other short-range wireless communication modes, such as bluetooth, Wi-Fi, and Zigbee. The wireless powered device 12 may broadcast the response signal or the power adjustment signal in the form of a bluetooth broadcast, and the bluetooth module in the wireless charging device 11 may receive the bluetooth broadcast and recognize the response signal or the power adjustment signal. The method is not limited to bluetooth broadcast, and may also be Wi-Fi broadcast or other types of broadcast, which is not limited in this application.

In order to reduce the situation that a chip of a wireless powered device is damaged due to excessive power during reverse charging and improve the convenience of reverse charging, the embodiment of the application provides a wireless charging method. The wireless charging apparatus 11 may adjust parameters of power transmission (including charging frequency, output voltage, duty ratio of alternating current) in a closed loop according to the power adjustment signal from the wireless powered apparatus 12 to adjust the transmission power. The closed loop refers to a process in which the wireless powered device 12 feeds back a power adjustment signal, the wireless charging device 11 adjusts a parameter of power transmission, and the wireless powered device 12 feeds back the transmission power after adjusting the parameter. The following description will take the adjustment of the charging frequency and the output voltage as an example.

Specifically, the wireless charging device 11 performs reverse charging on the wireless power receiving device 12 with the charging frequency as the first frequency and the output voltage as the first voltage. When the wireless powered device 12 indicates that the wireless charging device 12 needs to adjust the transmission power, the wireless charging device 11 adjusts the charging frequency to the maximum value to adjust the transmission power. The wireless charging device 11 may also adjust the charging voltage according to the input current and the charging frequency that are currently the most significant.

Procedure for increasing the transmit power: when the power adjustment signal from the wireless powered device 12 indicates that the transmission power needs to be adjusted up, the wireless charging device 11 may adjust the charging frequency down to increase the transmission power. When the charging frequency is adjusted to the minimum value by the closed-loop adjustment 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.

Procedure for reducing the transmission power: when the power adjustment signal from the wireless powered device 12 indicates that the transmission power needs to be reduced, the wireless charging device 11 may adjust the charging frequency up to reduce the transmission power. When the charging frequency is adjusted to the maximum value by the closed-loop adjustment and the input current is monitored to be the minimum value, the wireless charging device 11 decreases the output voltage to decrease the transmission power.

According to the wireless charging method provided by the embodiment of the application, when the wireless powered device 12 needs a larger transmission power, the charging frequency and the output voltage can be adjusted through closed-loop adjustment, so that the transmission power of the wireless charging device 11 is increased, and the reverse charging speed is increased. Conversely, when the wireless powered device 12 requires less transmission power, the charging frequency and the output voltage may also be adjusted by closed-loop adjustment to reduce the transmission power of the wireless charging device 11. Therefore, the situation that the chip of the wireless power receiving equipment is damaged due to overlarge power in reverse charging can be reduced, and the convenience of reverse charging is improved.

Based on the system architecture described in fig. 2 and the above principle overview, the following describes a wireless charging method according to an embodiment of the present application. In the wireless charging process, first, the wireless charging apparatus 11 and the wireless powered apparatus 12 perform handshake confirmation, and then the wireless charging apparatus 11 and the wireless powered apparatus 12 perform energy transmission. During the energy transmission process, the wireless charging device 11 may adjust a parameter of the power transmission according to a power adjustment signal from the wireless powered device. The above two processes are described separately below.

Process for handshake acknowledgement

Referring to fig. 5, fig. 5 is a schematic flowchart illustrating a wireless charging method according to an embodiment of the present disclosure. As shown in fig. 5, the wireless charging method provided in the embodiment of the present application may include steps S401 to S407.

S401: when the reverse charging is not started, the power supply chip 204 and the wireless charging chip 203 in the wireless charging device 11 are in a sleep state.

When the power supply chip 204 and the wireless charging chip 203 are in a sleep state, the power of the battery 205 is not supplied to the charging coil 202.

S402: the wireless charging apparatus 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.

The first user operation may be a user operation acting on a control displayed by the wireless charging apparatus 11, and may also be a pressing operation of a physical key. The control can be located on a pull-down menu interface, can also be located on a system setting interface, and can also be located on a negative one-screen interface. The signal triggering the processor to execute step S403 may also be a voice signal, a gesture signal, and the like, which is not limited in this embodiment of the application.

S403: the processor 201 controls the voltage output by the power supply chip 204 to be a set voltage.

In the embodiment of the present application, the power supply chip 204 may include 5V, 6.8V, and the like according to the control of the processor 201.

S404: the processor 201 issues initialization parameters to the wireless charging chip 203.

The initialization parameter may include a charging frequency range. In addition, the initialization parameters may also include OCP, OVP, time interval of ping signal transmission, duration of ping signal transmission, and the like.

The wireless charging chip 203 can adjust the charging frequency according to the charging frequency value interval to adjust the transmitting power. For example, the charging frequency interval is [110KHz, 135KHz ]. The resonance frequency is 110 KHz. When the transmission power needs to be increased, the wireless charging chip 203 can reduce the charging frequency in the value range. When the transmission power needs to be reduced, the wireless charging chip 203 can increase the charging frequency in the value interval. The process of adjusting the charging frequency may be exemplified as described with reference to fig. 6.

In step S405, the wireless charging chip 203 may also transmit a ping signal using the time interval and duration of the ping signal in the initialization parameters. E.g. a ping signal of 120 seconds duration, beyond which no further ping signal is transmitted. The state returns to step S401. The time interval for the ping signal transmission is 90 milliseconds.

S405: the wireless charging chip 203 sends a ping signal via the charging coil 202.

In the embodiment of the present application, the ping signal may be an energy signal with a fixed frequency. When the power receiving coil 301 in the wireless powered device 12 is close enough to the charging coil 202 and the energy of the ping signal received by the wireless powered device 12 is large enough, the wireless powered device 12 may execute step S406 to feed back the response signal.

S406: in response to receiving the ping signal, the wireless powered device 12 feeds back a response signal.

In the embodiment of the present application, the wireless powered device 12 may feed back a response signal to the wireless charging device 11 through in-band communication, where the response signal may be an amplitude modulation signal with a frequency of 2 KHz. The response signal is not limited to in-band communication, but may also be transmitted by other short-range wireless communication, for example, the response signal is a broadcast signal transmitted by bluetooth, Wi-Fi, or the like.

S407: the wireless charging chip 203 transmits energy to the wireless powered device 12 via the charging coil 202.

(II) procedure for adjusting parameters of Power Transmission

The principle of adjusting parameters of power transmission to adjust the transmit power is outlined below in connection with an example. The power transfer parameters may include output voltage and charging frequency, among others. The charging frequency is inversely related to the transmission power, and the voltage is positively related to the transmission power.

For example, the charging frequency in the initialization parameter has a value interval of [110KHz, 135KHz ]. A procedure of adjusting the transmission power to be large and a procedure of adjusting the transmission power to be small are separately described.

(1) Procedure for adjusting the transmission power up

The present output voltage is a first voltage (e.g., 5V) and the charging frequency is, for example, 135 KHz. The wireless charging chip 203 receives the 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 may decrease the charging frequency to increase the transmission power. The wireless charging chip 203 also receives a power adjustment signal from the wireless powered device 12 after adjusting the charging frequency. 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 powered device 12 feeds back the power adjustment signal, the wireless charging device 11 adjusts the parameter of power transmission, and the wireless powered device 12 feeds back the transmission power according to the adjusted parameter, so that the transmission power of the wireless charging device 11 can meet the requirement of the wireless powered device 12 through such closed-loop adjustment between the wireless charging device 11 and the wireless powered device 12.

The processor 201 may monitor the wireless charging chip 203 to obtain the charging frequency of the wireless charging chip 203 and the current input by the power supply chip 204 to the wireless charging chip 203. In a possible implementation manner, 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 a minimum charging frequency corresponding to the first voltage value, and the current input by the power supply chip 204 to the wireless charging chip 203 reaches a maximum input current value corresponding to the first voltage value. If the wireless powered device 12 instructs the wireless charging device 11 to increase the transmission power continuously, the processor 201 may 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 by the power supply chip to the wireless charging chip reaches the maximum input current value corresponding to the first voltage value. The processor 201 may control the power supply chip 204 to increase the charging voltage, for example, from a first voltage (5V) to a second voltage (e.g., 6.8V), to turn up the transmission power. Thereafter, the wireless charging chip 203 continues to adjust the charging frequency according to the power adjustment signal from the wireless powered device 12 to adjust the transmission power.

(2) Procedure for reducing transmission power

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

In one possible implementation, the wireless charging device 11 needs to turn down the transmission power continuously. After the wireless charging chip 203 adjusts the charging frequency to the maximum value of 135KHz, the received power adjustment signal may still indicate that the transmission power needs to be reduced. The processor 201 may monitor that the charging frequency is at a maximum of 135KHz, and the current input from the power supply chip 204 to the wireless charging chip 203 reaches a minimum input minimum value (e.g., 0.4A) corresponding to the first voltage value. The processor 201 may control the power supply chip 204 to decrease the charging voltage, for example, from the second voltage (6.8V) to the first voltage (e.g., 5V), so as to turn down the transmission power. Thereafter, the wireless charging chip 203 continues to adjust the charging frequency according to the power adjustment signal from the wireless powered device 12 to adjust the transmission power.

The process by which the processor 201 monitors and controls the regulated output voltage is described in detail below. The processor 201 may store a plurality of output voltage values of the output voltage. The processor 201 also stores a charging frequency threshold of the wireless charging chip 203 corresponding to any output voltage value and a current threshold input to the wireless charging chip 203 by the power supply chip 204 corresponding to any output voltage value. . When it is monitored that 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 value of the input current corresponding to the voltage value, the processor 201 may notify the power supply chip 204 to decrease the voltage value of the output voltage. Similarly, when it is detected that the charging frequency is the minimum value under the 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 value of the input current corresponding to the voltage value, the processor 201 may notify the power supply chip 204 to increase the voltage value of the output voltage.

For example, the voltage value of the output voltage stored by the processor 201, the maximum value of the charging frequency, and the maximum value of the current input by the power supply chip 204 to the wireless charging chip 203 may refer to table one. The table is an example of a voltage value of an output voltage, a maximum value of a charging frequency, and a maximum value of an input current provided by the embodiment of the application.

TABLE I example of voltage value of output voltage, maximum value of charging frequency, and maximum value of input current

As shown in table one, the processor 201 can store the most value of the charging frequency and the most value of the input current at the output voltages of 5V, 6.8V and 9.9V, respectively, and the voltage value switched by the processor 201 to control the power supply chip 204 under the corresponding parameters. Specifically, the processor 201 may poll the wireless charging chip 203 for the actual charging frequency value and the current value input by the power supply chip 204 to the wireless charging chip 203 every 100 milliseconds. Under the condition that 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 110KHz shown in table one, and the actual current value is greater than or equal to the maximum value 0.7A of the input current corresponding to 5V, the processor 201 may control the power supply chip 204 to adjust the output voltage from 5V to 6.8V.

Under the condition that 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 110KHz shown in table one, 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 value 0.8A of the input current corresponding to 6.8V, the processor 201 may control the power supply chip 204 to adjust the output voltage from 6.8V to 9.9V. Under the condition that 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 135KHz shown in table one, 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 input current minimum value 0.4A corresponding to 6.8V, the processor 201 may control the power supply chip 204 to adjust the output voltage from 6.8V to 5V.

Under the condition that 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 135KHz shown in table one, and the actual current value is less than or equal to the minimum value 0.5A of the input current corresponding to 9.9V, the processor 201 can control the power supply chip 204 to adjust the output voltage from 9.9V to 6.8V.

In the embodiment of the present application, the most significant value of the charging frequency is an endpoint of the charging frequency value interval in the initialization parameter. As shown in the first table, the charging frequency interval is [110KHz, 135KHz ], i.e., the maximum value of the charging frequency is 135KHz, and the minimum value is 110 KHz. After the initialization parameter is sent to the wireless charging chip 203, the wireless charging chip 203 may adjust the charging frequency in a charging frequency range [110KHz, 135KHz ] according to the charging frequency range, so as to adjust the transmitting power.

It should be understood that the values of the output voltage, the charging frequency, and the input current according to the embodiments of the present application are only used for explaining the embodiments of the present application, and should not be construed as limiting. The output voltage, the charging frequency, and the input current may also be other values, which is not limited in the embodiment of the present application.

Based on the adjustment principle of the above parameters, the procedure of adjusting the parameters of power transmission to adjust the transmission power is described below with reference to an example. Referring to fig. 6, fig. 6 is a schematic flowchart illustrating a wireless charging method according to an embodiment of the present disclosure. After the handshake confirmation process shown in fig. 5 is completed, energy can be transmitted between the wireless charging device 11 and the wireless powered device 12, and the transmission parameters are adjusted, and fig. 6 shows an adjustment process of the transmission parameters. The wireless charging method may include steps S501 to S519 as shown in fig. 6.

S501: the wireless charging device 11 transfers energy to the wireless powered device 12 at a first power transfer parameter.

The first power transmission parameter includes a charging frequency F0, an output voltage V0, and a transmitting power P0.

S502: the wireless power receiving apparatus 12 transmits a power adjustment signal indicating that the transmission power needs to be increased to the wireless charging apparatus 11.

In the embodiment of the present application, the wireless powered device 12 may periodically transmit the power adjustment signal to the wireless charging device 11. For example, the wireless powered device 12 may transmit the power adjustment signal to the wireless charging device 11 once every 150 ms.

S503: the wireless charging device 11 adjusts the parameter of the power transmission to the second power transmission parameter according to the power adjustment signal.

The second power parameter includes a charging frequency F1, an output voltage V0, and a transmitting power P1. Wherein F1 is less than F0, and P1 is more than P0. Referring to fig. 7, fig. 7 is a schematic diagram illustrating adjusting a parameter of power transmission according to an embodiment of the present disclosure. As shown in fig. 7, the abscissa and ordinate are the output voltage U and the charging frequency F, respectively. The parameter representing power transmission at point a 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 decreases the charging frequency. Closed loop adjustment process the wireless charging device 11 may adjust the charging frequency to a minimum value F1, i.e., the power transfer parameter represented by point B as shown in fig. 7. The minimum value F1 of the charging frequency is the minimum value in the range of values of the charging frequency stored in the wireless charging chip 203. As shown in fig. 7, the arrow from a to B represents a closed loop adjustment process of the wireless charging device 11 to adjust the first power transmission parameter to the second power transmission parameter.

S504: the wireless charging device 11 transmits energy to the wireless powered device 12 at the second power transmission parameter.

S505: the wireless power receiving apparatus 12 transmits a power adjustment signal indicating that the transmission power needs to be increased to the wireless charging apparatus 11.

S506: the wireless charging device 11 adjusts the parameter of power transmission to a third power transmission parameter according to the power adjustment signal and the input current.

The third power parameter includes a charging frequency F1, an output voltage V1, and a transmitting power P2. Wherein V1 is more than V0, and P2 is more than P1.

In this embodiment, step S506 is not limited to adjusting the power transmission parameter according to the power adjustment signal and the input current, and when the charging frequency is less than or equal to the minimum value, the wireless charging device 11 may also adjust the power transmission parameter to be the third power transmission parameter according to the power adjustment signal.

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 value of the input current, the processor 201 may control the power supply chip 204 to increase the output voltage value from V0 to V1, where the corresponding power transmission parameter is the third power transmission parameter, that is, the power transmission parameter represented by point C shown in fig. 7. The arrow from B to C represents a closed loop adjustment process of the wireless charging device 11 to adjust the second power transfer parameter to the third power transfer parameter.

S507: the wireless charging device 11 transmits energy to the wireless powered device 12 at the third power transmission parameter.

In the embodiment of the present application, after the parameter of the power transmission is adjusted to the third power transmission parameter, if the received power adjustment signal indicates that the transmission power does not need to be adjusted, the parameter is not adjusted at present. In another possible embodiment, after adjusting the parameter of the power transmission to the third power transmission parameter, the received power adjustment signal indicates that the transmission power needs to be reduced, and step S508 is executed.

S508: the wireless powered device 12 transmits a power adjustment signal to the wireless charging device 11, the power adjustment signal indicating that the transmission power needs to be reduced.

S509: the wireless charging device 11 adjusts the parameter of power transmission to a fourth power transmission parameter according to the power adjustment signal.

The fourth power parameter includes a charging frequency F2, an output voltage V1, and a transmitting power P3. Wherein F2 is more than F1, and P3 is less than P2. A fourth power parameter represented by point D in fig. 7. The arrow from C to D represents a closed loop adjustment process of the wireless charging device 11 to adjust the third power transfer parameter to the fourth power transfer parameter.

S510: the wireless charging device 11 transmits energy to the wireless powered device 12 at the fourth power transmission parameter.

In the embodiment of the present application, in the initial stage of the reverse charging, when the power level in the wireless power receiving device 12 is low (for example, the power level is lower than 10%), the transmission power of the wireless charging device 11 may be increased through the processes of steps S501 to S510 (or steps S501 to S507), so as to increase the speed of the reverse charging.

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

In an embodiment of the present application, a first electronic device wirelessly transmits a first wireless charging signal to a second electronic device, where a frequency of the first wireless charging signal is a first frequency, and a 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, responding to a first power adjustment signal from the second electronic device, wherein the first power adjustment signal is used for indicating to increase the power of a 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 smaller than the first frequency. When the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency is matched with the first frequency threshold, the second power adjustment signal is used for indicating to increase the power of the wireless charging signal in response to the second power adjustment signal from the second electronic device, the first electronic device wirelessly transmits a third wireless charging signal to the second electronic device, the voltage of the third wireless charging signal is a second voltage, and the second voltage is greater than the first voltage.

In this embodiment, 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.

In response to the received first power adjustment signal, in step S503, 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.

In the embodiment of the present application, the matching of the second frequency and 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, namely the minimum value in the charging frequency value range.

In this embodiment of the 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 (e.g., greater than the second frequency). The second power adjustment signal may include the power adjustment signal in step S505, which indicates to increase the power of the wireless charging signal. In one possible implementation, the frequency of the third wireless charging signal may be equal to the second frequency, i.e., 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 embodiment of the application, when the first electronic device wirelessly transmits the first wireless charging signal and the second 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 transmits the third wireless charging signal to the second electronic device in a wireless mode, the power supply circuit inputs a second voltage to the wireless charging circuit.

The procedure for reducing the transmit power is described below, taking as an example the start from the first power transmission parameter (V0, F0, P0).

S511: the wireless powered device 12 transmits a power adjustment signal to the wireless charging device 11, the power adjustment signal indicating that the transmission power needs to be reduced.

S512: the wireless charging device 11 adjusts the parameter of power transmission to a fifth power transmission parameter according to the power adjustment signal.

The fifth power parameter includes a charging frequency F3, an output voltage V0, and a transmitting power P4. Wherein F3 is more than F0, and P4 is less than P0. Referring to fig. 8, fig. 8 is a schematic diagram illustrating adjusting a parameter of power transmission according to an embodiment of the present application. As shown in fig. 8, the abscissa and ordinate are the output voltage U and the charging frequency F, respectively. The parameter representing power transmission at point a is the first power transmission parameter. When the power adjustment signal indicates that the transmission power needs to be decreased, the wireless charging device 11 increases the charging frequency. Closed loop adjustment process the wireless charging device 11 may adjust the charging frequency to a maximum value F3, i.e., the power transfer parameter represented by point E as shown in fig. 8. The maximum value F3 of the charging frequency is the maximum value in the range of the charging frequency stored in the wireless charging chip 203. As shown in fig. 8, the arrow from a to E represents a closed loop adjustment process of the wireless charging device 11 to adjust the first power transmission parameter to the fifth power transmission parameter.

S513: the wireless charging device 11 transmits energy to the wireless powered device 12 at the fifth power transmission parameter.

S514: the wireless powered device 12 transmits a power adjustment signal to the wireless charging device 11, the power adjustment signal indicating that the transmission power needs to be reduced.

S515: the wireless charging device 11 adjusts the parameter of power transmission to a sixth power transmission parameter according to the power adjustment signal and the input current.

The sixth power parameter includes a charging frequency F3, an output voltage V2, and a transmitting power P5. Wherein V2 is less than V0, and P5 is less than P4.

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 may decrease the output voltage from V0 to V2, where the corresponding power transmission parameter is the sixth power transmission parameter, that is, the power transmission parameter represented by point F shown in fig. 8. The arrow from E to F represents a closed loop adjustment process of the wireless charging device 11 to adjust the fifth power transmission parameter to the sixth power transmission parameter.

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, and when the charging frequency is greater than or equal to the maximum value, the wireless charging device 11 may also adjust the power transmission parameter to be the sixth power transmission parameter according to the power adjustment signal.

S516: the wireless charging device 11 transmits energy to the wireless powered device 12 at the sixth power transmission parameter.

In this embodiment of the present application, after the parameter of power transmission is adjusted 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 not adjusted at present. In another possible embodiment, after the parameter of the power transmission is adjusted to the sixth power transmission parameter, and the received power adjustment signal indicates that the transmission power needs to be increased, step S517 is performed.

S517: the wireless power receiving apparatus 12 transmits a power adjustment signal indicating that the transmission power needs to be increased to the wireless charging apparatus 11.

S518: the wireless charging device 11 adjusts the parameter of power transmission to a seventh power transmission parameter according to the power adjustment signal.

The seventh power parameter includes a charging frequency F4, an output voltage V2, and a transmitting power P6. Wherein F4 is less than F3, and P6 is more than P5. The seventh power parameter represented by point G in fig. 8. The arrow from F to G represents a closed loop adjustment process of the wireless charging device 11 to adjust the sixth power transfer parameter to the seventh power transfer parameter.

S519: the wireless charging device 11 transmits energy to the wireless powered device 12 at the seventh power transmission parameter.

In the embodiment of the present application, in the phase near the end of the reverse charging when the power level in the wireless powered device 12 is higher than the set threshold (for example, the power level is higher than 90%), the transmission power of the wireless charging device 11 may be reduced through the processes of steps S511 to S519 (or S511 to S516).

During the wireless charging process, the wireless powered device 12 may periodically send a power adjustment signal to the wireless charging device 11, and when the power adjustment signal indicates that the transmission power does not need to be adjusted, the wireless charging device 11 may maintain the current power parameter.

In the embodiment of the present application, the wireless charging device 11 may adjust the charging frequency to adjust the transmission power according to the requirement from the wireless powered device 12. In addition, the wireless charging device 11 may further adjust the output voltage according to whether the current charging frequency and the current input by 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, the power adjustment range of the wireless charging apparatus 11 is increased by adjustment of the charging frequency and the output voltage. The wireless charging device 11 can adjust the power transmission parameters in time, thereby reducing the damage to the chip of the wireless powered device 12 during reverse charging and improving the convenience of reverse charging.

In this embodiment, the power adjustment signal in step S511 is the third power adjustment signal. In response to the received third power adjustment signal, in 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.

In the embodiment of the present application, the matching of the third frequency and 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 charging frequency value range.

In this embodiment of the 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 (e.g., less than the third frequency). The fourth power adjustment signal may comprise the power adjustment signal in step S514. In one possible implementation, the frequency of the fifth wireless charging signal may be equal to the third frequency, i.e., 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 smaller than the third frequency, and the fifth wireless charging signal may include the energy signal output by the charging coil 202 in step S519.

When the first electronic device transmits a fourth wireless charging signal to the second electronic device in a wireless mode, the power supply circuit inputs a first voltage to the wireless charging circuit. When the first electronic device transmits the fifth wireless charging signal to the second electronic device in a wireless mode, the power supply circuit inputs a third voltage to the wireless charging circuit.

In this embodiment, 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 is, for example, 110KHz), 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 the voltage value, then the processor 201 increases the output voltage of the power supply chip 204 to increase the transmission power. Here, the current maximum value is a first current threshold value. The matching between the current input by the power supply chip 204 to the wireless charging chip 203 and 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 the voltage value.

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

In other embodiments, during the reverse charging process, when the power of the wireless charging device 11 itself is lower than a set threshold (e.g., lower than 30% of the remaining power), the processor 201 in the wireless charging device 11 may instruct to decrease the transmission power. In analogy with steps S511 to S519, the wireless charging chip 203 may further increase the charging frequency according to the instruction, and the power supply chip 204 may further decrease the output voltage according to the instruction to decrease the transmission power. Thus, when the wireless charging device 11 is reversely charged, the situation that the use is influenced by the output of excessive electric quantity of the wireless charging device is reduced, and the convenience of reverse charging is improved.

In other embodiments, during the reverse charging, when the ratio of the power output by the wireless charging device 11 to the total power is lower than a set threshold (e.g., lower than 30%), the processor 201 in the wireless charging device 11 may instruct to decrease the transmission power. In analogy with steps S511 to S519, the wireless charging chip 203 may further increase the charging frequency according to the instruction, and the power supply chip 204 may further decrease the output voltage according to the instruction to decrease the transmission power. Wherein the ratio of the output power to the total power may be stored by the wireless charging device 11 in response to a user operation.

In other embodiments of the present application, the wireless charging chip 203 may further adjust the duty cycle of the alternating current when the power adjustment signal indicates that the transmission power needs to be increased or decreased. The value interval of the duty ratio may also be issued 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 ratio of the alternating current to increase the transmission power. When the transmission power needs to be reduced, the wireless charging chip 203 may reduce the duty cycle of the alternating current to reduce the transmission power.

In another possible embodiment, when the charging frequency does not reach the minimum value and the transmission power needs to be increased, the wireless charging chip 203 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 chip 203 increases the duty ratio of the alternating current. When the charging frequency does not reach the maximum value and the transmission power needs to be reduced, the wireless charging chip 203 may increase the charging frequency to turn down 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 reduced, the wireless charging chip 203 reduces the duty ratio of the alternating current.

In another possible embodiment, a second wireless charging signal is transmitted between the wireless charging device 11 and the wireless powered device 12, and the duty cycle of the second wireless charging signal is the 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 (minimum), and the wireless charging device 11 transmits a sixth wireless charging signal to the second electronic device in response to a fifth power adjustment signal from the wireless powered device 12, the fifth power adjustment signal being used to instruct the power of the wireless charging signal to be increased. 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 transmits a sixth wireless charging signal to the second electronic device in a wireless manner, the second duty cycle is matched with the duty cycle threshold, and the second electronic device responds to a second power adjustment signal from the second electronic device, wherein the second power adjustment signal is used for indicating that the power of the wireless charging signal is increased. The first electronic device transmits a third wireless charging signal to the second electronic device.

In this embodiment of the application, the matching of the second duty ratio with the duty ratio threshold means that the second duty ratio is greater than or equal to the duty ratio threshold, and the duty ratio threshold is the maximum value of the duty ratio. In this embodiment, the initialization parameter may further include a value interval of a duty ratio of the alternating current.

As can be seen from the above, when the wireless charging device 11 adjusts the power transmission parameters (the charging frequency, the duty ratio, and the output voltage) to increase the transmission power, the charging frequency is first adjusted to decrease 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 ratio of the alternating current to increase the transmission power. When the duty ratio of the alternating current is greater than or equal to the maximum duty ratio (i.e., the duty ratio threshold), the wireless charging apparatus 11 increases the output voltage to increase the transmission power. In this way, when the wireless powered device 12 needs more transmission power, the charging frequency, the ac duty cycle, and the output voltage can be adjusted by closed-loop adjustment to increase the transmission power of the wireless charging device 11 and increase the speed of reverse charging.

Conversely, when the wireless powered device 12 needs smaller transmission power, the charging frequency, the duty ratio of the alternating current, and the output voltage may also be adjusted in sequence by closed-loop adjustment to reduce the transmission power of the wireless charging device 11. Therefore, the situation that the chip of the wireless power receiving equipment is damaged due to overlarge power in reverse charging can be reduced, and the convenience of reverse charging is improved.

In another possible embodiment, the wireless charging device 11 increases the output voltage when the charging frequency is the minimum value, the duty ratio of the alternating current is the maximum value, and the current input by the power supply chip 204 to the wireless charging chip 203 is the maximum value of the input current. When the charging frequency is the maximum value, the duty ratio of the alternating current is the minimum value, and the current input by the power supply chip 204 to the wireless charging chip 203 is the minimum value of the input current, the wireless charging device 11 decreases the output voltage.

In the embodiment of the present application, the need to adjust the transmission power may include two cases: one is that the power adjustment signal from the wireless powered device 12 indicates that the transmit 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.

In the embodiment of the present application, the power adjustment signal may be transmitted through in-band communication, or may be transmitted through other short-range wireless communication methods. The power adjustment signal may include an 8-bit symbol number, which may be used to indicate an increase or decrease in transmit power. Illustratively, a positive number of the symbols indicates that the transmit power needs to be increased, indicating that the transmit power required by the wireless powered device 12 is greater than the current transmit power. A negative sign indicates that the transmit power needs to be reduced, indicating that the transmit power required by the wireless powered device 12 is less than the current transmit power. A symbol number of 0 indicates that the current transmit power needs to be maintained, indicating that the transmit power required by the wireless powered device 12 is equal to the current transmit power.

In this embodiment, in the process of monitoring the charging frequency and the input current of the wireless charging chip 201, the processor 201 may determine that the charging frequency is the minimum value when the duration of the charging frequency being less than or equal to the minimum value (e.g., 110KHz) exceeds a set threshold. Similarly, when it is detected that the duration of the current input by the power supply chip 204 to the wireless charging chip 203 is greater than or equal to the minimum input current value (e.g., 0.7A) corresponding to the voltage exceeds a set threshold (e.g., 1 second), the processor 201 may determine that the input current is the maximum input current value corresponding to the voltage. The processor 201 may control the power supply chip 204 to increase the charging voltage according to the monitored charging frequency being a minimum value of 110KHz and the input current being a maximum value (e.g., 0.7A).

Similarly, for a maximum charging frequency, the processor 201 may also determine by monitoring that the duration of time greater than or equal to the maximum value exceeds a set threshold. For a minimum value of the input current, the processor 201 may also determine that the duration of time less than or equal to the corresponding minimum value of the output voltage exceeds a set threshold. The setting threshold corresponding to the charging frequency and the input current is not limited to 1 second, and may be other values, the same value or different values.

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

In the following, taking three different values of the charging voltage of the wireless charging device 11 as an example, the adjustment principle of the transmission power in the reverse charging process is specifically described.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating adjusting a parameter of power transmission according to an embodiment of the present disclosure. First, a process of increasing the transmission power according to the power adjustment signal from the wireless powered device 12 will be described with reference to fig. 9. The process of increasing the transmission power is divided into a process of decreasing the charging frequency to increase the transmission power and a process of increasing the output voltage to increase the transmission power, which are separately described below.

(1) Reducing charging frequency to increase transmit power process

The process of decreasing the charging frequency to increase the transmission power can be similar to the steps S501-S502 in the embodiment described in FIG. 6. As shown in fig. 9, the power transfer parameters of the present wireless charging device 11 are a charging frequency F0, an output voltage V0, and a transmission power P0. As shown in fig. 9, point a represents the power transmission parameter of the present wireless charging apparatus 11. The wireless charging chip 203 may adjust the charging frequency smaller to increase the transmission power according to the power adjustment signal from the wireless powered device 12 indicating that the transmission power needs to be increased. The wireless charging chip 203 also receives a power adjustment signal from the wireless powered device 12 after adjusting the charging frequency. 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 powered device 12 feeds back the power adjustment signal, the wireless charging device 11 adjusts the parameter of power transmission, and the wireless powered device 12 increases the transmission power through such closed-loop adjustment between the wireless charging device 11 and the wireless powered device 12 according to the transmission power feedback after the parameter adjustment. Until the wireless charging chip 203 reduces the charging frequency to the minimum value F5, the processor 201 may monitor that the charging frequency is the minimum value F5.

As shown in fig. 9, point H represents the power transmission parameter of the wireless charging device 11 when the charging frequency reaches the minimum value, and the transmission power is P7. Wherein F5 is less than F0, and P7 is more than P0. The wireless charging device 11 may then increase the output voltage to increase the transmit power. The arrows from a to H represent a closed-loop regulation process of the wireless charging device 11 to adjust the power transfer parameters (F0, V0, P0) to the power transfer parameters (F5, V0, P7).

(2) Procedure for increasing output voltage to increase transmission power

The processor 201 may detect 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, and the processor 201 may control the power supply chip 204 to increase the charging voltage, for example, from V0 to V3, so as to increase the transmission power.

As shown in fig. 9, point I represents a parameter of power transmission of the wireless charging device 11 when the charging voltage is increased to V3, and the transmission power is P8. Wherein V3 is more than V0, and P8 is more than P7. The arrow from H to I represents an adjustment process of the wireless charging apparatus 11 to adjust the power transfer parameters (F5, V0, P7) to the power transfer parameters (F5, V3, P8).

In the case of the power transmission parameter at point I, when the power adjustment signal received by the wireless charging chip 203 indicates that the transmission power needs to be reduced, the wireless charging chip 203 increases the charging frequency to reduce the transmission power. The process may refer to steps S508 to S509 in the embodiment described in fig. 6. As shown in fig. 9, the arrow from I to J represents a closed loop adjustment process in which the wireless charging device 11 adjusts the power transmission parameter (F5, V3, P8) to increase the charging frequency to reduce the transmission power.

In the case of the power transmission parameter at point I, when the processor 201 detects that the charging frequency is 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 V3, the processor 201 may notify the power supply chip 204 to increase the voltage value of the output voltage. The power chip 204 may increase the output voltage from V3 to V4. As shown in fig. 9, point K represents a parameter of power transmission of the wireless charging device 11 when the charging voltage is increased to V4, and the transmission power is P9. Wherein V4 is more than V3, and P9 is more than P8. The arrows from I to K represent the adjustment process of the wireless charging apparatus 11 to adjust the power transfer parameters (F5, V3, P8) to the power transfer parameters (F5, V4, P9).

In the embodiment described in conjunction with fig. 9, the wireless charging signal transmitted according to the charging parameter indicated by point a is the first wireless charging signal. And the wireless charging signal transmitted according to the charging parameter represented by the point H is a second wireless charging signal. In one case, the wireless charging signal transmitted according to the charging parameter indicated by the point I is the third wireless charging signal. In another case, the wireless charging signal transmitted according to the charging parameter represented by the point K is a third wireless charging signal.

Next, a process of reducing the transmission power according to the power adjustment signal from the wireless powered device 12 will be described with reference to fig. 9. The process of reducing the transmission power is divided into a process of increasing the charging frequency to reduce the transmission power and a process of decreasing the output voltage to reduce the transmission power, which are separately described below.

(1) Increasing charging frequency to reduce transmit power process

The procedure of increasing the charging frequency to reduce the transmission power can be similar to the steps S511-S512 in the embodiment described in FIG. 6. As shown in fig. 9, the power transmission parameters of the current wireless charging apparatus 11 are (F5, V4, P9). The power adjustment signal from the wireless powered device 12 indicates that the transmission power needs to be increased, and the wireless charging chip 203 may increase the charging frequency to turn down the transmission power. The wireless charging chip 203 also receives a power adjustment signal from the wireless powered device 12 after the charging frequency is adjusted up. If the power adjustment signal indicates that the adjusted transmission power still needs to be adjusted small, the wireless charging chip 203 continues to adjust the charging frequency large.

In this way, the wireless powered device 12 feeds back the power adjustment signal, the wireless charging device 11 adjusts the parameters of power transmission, and the wireless powered device 12 reduces the transmission power through such closed-loop adjustment between the wireless charging device 11 and the wireless powered device 12 according to the transmission power feedback after the parameters are adjusted. Until the wireless charging chip 203 increases the charging frequency to the maximum value F6, the processor 201 may monitor that the charging frequency is the maximum value F6.

As shown in fig. 9, point O represents the power transmission parameter of the wireless charging device 11 when the charging frequency reaches the maximum value, and the transmission power is P10. Wherein F6 is more than F5, and P10 is less than P9. The wireless charging device 11 may then reduce the output voltage to reduce the transmit power. The arrows from K to O represent a closed loop regulation process of the wireless charging device 11 to adjust the power transfer parameters (F0, V4, P9) to the power transfer parameters (F6, V4, P10).

(2) Process for reducing output voltage to reduce transmission power

The processor 201 may 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 value of the input current corresponding to V4, and the processor 201 may control the power supply chip 204 to decrease the charging voltage, for example, from V4 to V3, so as to reduce the transmitting power.

As shown in fig. 9, point P represents a parameter of power transmission of the wireless charging device 11 when the charging voltage is reduced to V3, and the transmission power is P11. Wherein V3 is less than V4, and P11 is less than P10. The arrows from O to P represent a closed loop regulation process of the wireless charging device 11 to adjust the power transfer parameters (F6, V4, P10) to the power transfer parameters (F6, V3, P11).

In the case of the power transmission parameter at point P, when the power adjustment signal received by the wireless charging chip 203 indicates that the transmission power needs to be increased, the wireless charging chip 203 decreases the charging frequency to increase the transmission power. The process may refer to steps S517-S518 in the embodiment described in fig. 6 and the arrow from F to G described in fig. 8. As shown in fig. 9, the arrows from P to Q represent a closed loop adjustment process in which the wireless charging device 11 adjusts the power transfer parameters (F6, V3, P11) to decrease the charging frequency to increase the transmission power.

In the case of the power transmission parameter at point P, when the processor 201 detects 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 value of the input current corresponding to V3, the processor 201 may notify the power supply chip 204 to decrease the voltage value of the output voltage. The power chip 204 may reduce the output voltage from V3 to V0. As shown in fig. 9, point R represents a parameter of power transmission of the wireless charging device 11 when the charging voltage is reduced to V0, and the transmission power is P12. Wherein V0 < V3, P12 < P11 the arrows from P to R represent a closed loop regulation procedure of the wireless charging device 11 adjusting the power transmission parameters (F6, V3, P11) to the power transmission parameters (F6, V0, P12).

In the transmission power adjustment process described in fig. 9, the wireless charging device 11 may adjust the transmission power by adjusting the charging frequency between the charging frequency intervals [ F5, F6] according to the requirement from the wireless powered device 12. In addition, the wireless charging device 11 may further adjust the output voltage among three values of V0, V3, and V4 according to whether the current charging frequency and the input current both reach the maximum value, so as to adjust the transmission power. In this way, the power adjustment range of the wireless charging apparatus 11 is increased by adjustment of the charging frequency and the output voltage. The wireless charging device 11 can adjust the power transmission parameters in time, thereby reducing the damage to the chip of the wireless powered device 12 during reverse charging and improving the convenience of reverse charging.

It can be understood that, in the embodiment of the present application, the charging voltage has two or three different values as an example for description, but the number of values of the charging voltage is not limited in the embodiment of the present application. The embodiment of the application is also applicable to the wireless charging equipment with more than three values of the charging voltage.

It can be understood that, the embodiment of the present application is described by taking reverse charging as an example, but the embodiment of the present application is not limited to a reverse charging scenario, and other scenarios may also be used, for example, a charging base performs wireless charging on an electronic device. In this embodiment, the charging base is the wireless charging device 11, and the electronic device is the wireless powered device 12. In addition, the present embodiment is not limited to wireless charging, and may also be applied to a scenario in which the wireless charging apparatus 11 performs wired charging for the wireless powered apparatus 12.

Next, an exemplary electronic device provided in the embodiment of the present application is described. The electronic device may be the wireless charging device 11 in the embodiment of the present application.

Fig. 10 shows a schematic structural diagram of the electronic device 100.

The following describes an embodiment specifically by taking the electronic device 100 as an example. It should be understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation to the electronic apparatus 100, and the electronic apparatus 100 may have more or less components than those shown in the drawings, may combine two or more components, or may have a different configuration of components. The various components shown in the figures 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.

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 charge management module 140, a power management module 141, a battery 142, an indicator 192, and a display screen 194.

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

Processor 110 may include one or more processing units, such as: 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. The different processing units may be separate devices or may be integrated into one or more processors.

The controller may be, among other things, a neural center and a command center of the electronic device 100. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (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.

In the embodiment of the present application, the processor 110 may be used to implement the functions of the processor 201 in the embodiment described in fig. 2.

It should be understood that the interface connection relationship between the modules illustrated in the embodiments of the present application is only an illustration, and does not limit the structure of the electronic device 100. In other embodiments of the present application, the electronic device 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charge management module 140 may be used to receive charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the electronic device 100. The charging management module 140 may also supply power to the electronic device through the power management module 141 while charging the battery 142.

The charging management module 140 may also be used to output the power of the battery 142 to other electronic devices, for example, to reversely charge the wireless powered device 12 with the power of the battery 142. The charging management module 140 may reversely charge the powered device in a wired or wireless manner. In the wired mode, the charging management module 140 may output power to the powered device through the USB interface 130. In a wireless manner, the charging management module 140 may further be connected to the power supply chip 204, and the power supply chip 204 and the wireless charging chip 203 are sequentially connected to the charging coil 202 (for example, described with reference to fig. 2). The wireless charging device 11 realizes energy transmission to the wireless powered device 12 through the path of the battery 142, the charging management module 140, the power supply chip 204, the wireless charging chip 205 and the charging coil 202.

In the embodiment of the present application, the battery 142 may be used to implement the functions of the battery 205 in the embodiment described in fig. 2.

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 input from the battery 142 and/or the charge management module 140 and provides power to the processor 110, the internal memory 121, the external memory, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be used to monitor parameters such as battery capacity, battery cycle count, battery state of health (leakage, impedance), etc. In some other embodiments, the power management module 141 may also be disposed in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be disposed in the same device.

The display screen 194 is used to display images, video, and the like. The display screen 194 includes a display panel. The display panel may adopt a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED), a flexible light-emitting diode (FLED), a miniature, a Micro-oeld, a quantum dot light-emitting diode (QLED), and the like. In some embodiments, the electronic device 100 may include 1 or N display screens 194, with N being a positive integer greater than 1. Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the memory capability of the electronic device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card.

The internal memory 121 may be used to store computer-executable program code, which includes instructions. The processor 110 executes various functional applications of the electronic device 100 and data processing by executing instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, phone book, etc.) created during use of the electronic device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

The above description mainly introduces the solutions provided in the embodiments of the present application from the perspective of the method implemented by the electronic device. It is to be understood that each network element, such as an electronic device, a processor, etc., comprises corresponding hardware structures and/or software modules for performing each function in order to realize the functions described above. Those of skill in the art would readily appreciate that the present application is capable of being implemented as hardware or a combination of hardware and computer software for performing the exemplary network elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, the electronic device, the image capturing device, and the like may be divided into the functional modules according to the above method examples, for example, each functional module may be divided for each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

The embodiment of the application also provides a computer readable storage medium. All or part of the processes in the above method embodiments may be performed by relevant hardware instructed by a computer program, which may be stored in the above computer storage medium, and when executed, may include the processes in the above method embodiments. The computer-readable storage medium includes: various media that can store program codes, such as a read-only memory (ROM) or a Random Access Memory (RAM), a magnetic disk, or an optical disk.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in or transmitted over a 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, a data center, etc., that incorporates one or more of the available media. The usable medium may 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)), among others.

The steps in the method of the embodiment of the application can be sequentially adjusted, combined and deleted according to actual needs.

The modules in the device can be merged, divided and deleted according to actual needs.

The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wireless charging method, the method comprising:

the method comprises the steps that a first electronic device transmits a first wireless charging signal to a second electronic device in a wireless mode, wherein 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 wirelessly transmits the first wireless charging signal to the second electronic device, responding to a first power adjustment signal from the second electronic device, wherein the first power adjustment signal is used for indicating to increase the power of a wireless charging signal, the first electronic device wirelessly transmits a second wireless charging signal to the second electronic device, 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 smaller than the first frequency;

when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, the second frequency is matched with a first frequency threshold, a second power adjustment signal is responded to from the second electronic device, the second power adjustment signal is used for indicating to increase the power of the wireless charging signal, the first electronic device wirelessly transmits a third wireless charging signal to the second electronic device, 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 of claim 1, further comprising:

when the first electronic device transmits the first wireless charging signal to the second electronic device in a wireless manner, responding to a third power adjustment signal from the second electronic device, where the third power adjustment signal is used to instruct to reduce the power of the wireless charging signal, and the first electronic device transmits a fourth wireless charging signal to the second electronic device in a wireless manner, where 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 of claim 2, further comprising:

when the first electronic device transmits the fourth wireless charging signal to the second electronic device in a wireless manner, the third frequency is matched with a second frequency threshold, and in response to a fourth power adjustment signal from the second electronic device, the fourth power adjustment signal is used for instructing to reduce the power of the wireless charging signal, the first electronic device transmits a fifth wireless charging signal to the second electronic device in a wireless manner, the voltage of the fifth wireless charging signal is a third voltage, the third voltage is smaller than the first voltage, and the second frequency threshold is larger than the first frequency threshold.

4. The method of any one of claims 1 to 3, wherein the first electronic device comprises a power supply circuit and a wireless charging circuit, the power supply circuit providing 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 transmits the third wireless charging signal to the second electronic device in a wireless manner, the power supply circuit inputs the second voltage to the wireless charging circuit;

when the first electronic device transmits the fifth wireless charging signal to the second electronic device in a wireless manner, the power supply circuit inputs the third voltage to the wireless charging circuit.

5. The method of claim 4,

when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, where the second frequency matches the first frequency threshold, and in response to a second power adjustment signal from the second electronic device, where the second power adjustment signal is used to instruct to increase 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 transmits the second wireless charging signal to the second electronic device in a wireless mode, the second frequency is matched with the first frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with the first current threshold, a second power adjusting signal from the second electronic device is responded, the second power adjusting signal is used for indicating to increase the power of the wireless charging signal, and the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless mode.

6. The method of claim 4,

the wirelessly transmitting, by the first electronic device to the second electronic device, a fifth wireless charging signal by the first electronic device in response to a fourth power adjustment signal from the second electronic device, the fourth frequency being matched to a second frequency threshold when the first electronic device wirelessly transmits the fourth wireless charging signal to the second electronic device, the fourth power adjustment signal being used to instruct power down of the wireless charging signal, includes:

when the first electronic device transmits the fourth wireless charging signal to the second electronic device in a wireless manner, the third frequency is matched with the second frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with the second current threshold, a fourth power adjusting signal from the second electronic device is responded, the fourth power adjusting signal is used for indicating to reduce the power of the wireless charging signal, and the first electronic device transmits a fifth wireless charging signal to the second electronic device in a wireless manner.

7. The method of any of claims 1 to 6, wherein the first frequency threshold is 110KHz and the second frequency threshold is 135 KHz.

8. The method of any one of claims 1 to 7, wherein the duty cycle of the second wireless charging signal is a first duty cycle, and when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, and the second frequency matches a first frequency threshold, the second power adjustment signal is used to instruct to increase the power of the wireless charging signal in response to a second power adjustment signal from the second electronic device, and the first electronic device wirelessly transmits a third wireless charging signal to the second electronic device, the method comprising:

when the first electronic device wirelessly transmits the second wireless charging signal to the second electronic device, where the second frequency matches a first frequency threshold, responding to a fifth power adjustment signal from the second electronic device, where the fifth power adjustment signal is used to instruct to increase the power of the wireless charging signal, and the first electronic device wirelessly transmits a sixth wireless charging signal to the second electronic device, where a 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 transmits the sixth wireless charging signal to the second electronic device in a wireless manner, and the second duty cycle is matched with the duty cycle threshold, responding to a second power adjustment signal from the second electronic device, wherein the second power adjustment signal is used for indicating to increase the power of the wireless charging signal, and the first electronic device transmits a third wireless charging signal to the second electronic device in a wireless manner.

9. The method of any of claims 1-8, wherein the first power adjustment signal, the second power adjustment signal are transmitted via in-band communication, or wherein the first power adjustment signal, the second power adjustment signal are Bluetooth signals from the second electronic device.

10. An electronic device, wherein the electronic device is a first electronic device, the first electronic device comprising: one or more processors, a battery, power supply circuitry, wireless charging circuitry, 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 with the power supply circuit and the wireless charging circuit; wherein:

the wireless charging circuit is used for transmitting a first wireless charging signal to second electronic equipment 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 transmit a second 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 when the first wireless charging signal is transmitted to the second electronic device through the charging coil, where a frequency of the second wireless charging signal is a second frequency, a voltage of the second wireless charging signal is the first voltage, and the second frequency is smaller 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, 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 of claim 10,

the wireless charging circuit is further configured to respond to a third power adjustment signal from the second electronic device when the first wireless charging signal is transmitted to the second electronic device through the charging coil, where the third power adjustment signal is used to instruct to reduce the power of the wireless charging signal, and transmit a fourth wireless charging signal to the second electronic device through the charging coil, where 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.

12. The electronic device of claim 11,

the wireless charging circuit is further configured to, when the fourth wireless charging signal is transmitted to the second electronic device through the charging coil, match the third frequency with a second frequency threshold, respond to a fourth power adjustment signal from the second electronic device, where the fourth power adjustment signal is used to instruct to decrease the power of the wireless charging signal, and transmit a fifth wireless charging signal to the second electronic device through the charging coil, where a voltage of the fifth wireless charging signal is a third voltage, the third voltage is smaller than the first voltage, and the second frequency threshold is greater than the first frequency threshold.

13. The electronic device of any of claims 10-12,

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 of claim 13, wherein the wireless charging circuit is specifically configured to:

when the second wireless charging signal is transmitted to the second electronic device through the charging coil, the second frequency is matched with the first frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with the first current threshold, a second power adjusting signal from the second electronic device is responded, the second power adjusting signal is used for indicating that the power of the wireless charging signal is increased, and a third wireless charging signal is transmitted to the second electronic device through the charging coil.

15. The electronic device of claim 13, wherein the wireless charging circuit is specifically configured to:

when the fourth wireless charging signal is transmitted to the second electronic device through the charging coil, the third frequency is matched with a second frequency threshold, the current input by the power supply circuit to the wireless charging circuit is matched with a second current threshold, a fourth power adjusting signal from the second electronic device is responded, the fourth power adjusting signal is used for indicating that the power of the wireless charging signal is reduced, and a fifth wireless charging signal is transmitted to the second electronic device through the charging coil.

16. The electronic device of any of claims 10-15, wherein the first frequency threshold is 110KHz and the second frequency threshold is 135 KHz.

17. The electronic device according to any one of claims 10 to 16, wherein a duty cycle of the second wireless charging signal is a first duty cycle, and the wireless charging circuit is specifically configured to:

when the second wireless charging signal is transmitted to the second electronic device through the charging coil, the second frequency is matched with a first frequency threshold, a fifth power adjustment signal is responded to from the second electronic device, the fifth power adjustment signal is used for indicating to increase the power of the wireless charging signal, a sixth wireless charging signal is transmitted to the second electronic device through the charging coil, the duty ratio of the sixth wireless charging signal is a second duty ratio, and the second duty ratio is larger than the first duty ratio;

when the sixth wireless charging signal is transmitted to the second electronic device through the charging coil, the second duty cycle is matched with a duty cycle threshold, a second power adjustment signal from the second electronic device is responded, the second power adjustment signal is used for indicating that the power of the wireless charging signal is increased, and a third wireless charging signal is transmitted to the second electronic device through the charging coil.

18. The electronic device of any of claims 10-17, wherein the first power adjustment signal and the second power adjustment signal are transmitted via in-band communication, and wherein the first power adjustment signal and the second power adjustment signal are received by the wireless charging circuit, or wherein

The electronic device further comprises 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, comprising a first electronic device and a second electronic device, wherein:

the first electronic equipment transmits a wireless charging signal to the second electronic equipment in a wireless mode;

the second electronic device is used for sending a power adjusting signal to the first electronic device when receiving a wireless charging signal transmitted by the first electronic device in a wireless mode;

the first electronic device configured to perform the wireless charging method according to any one of claims 1 to 9.