A wireless charging circuit, device, method and computer-readable storage medium

Abstract

The present application provides a wireless charging circuit, device, method and computer-readable storage medium, which relate to the field of terminal technology. The wireless charging circuit includes a power management module, a switch, a capacitor, and a plurality of inductors. The capacitor is coupled to the plurality of inductors through the switch, and the capacitor and each of the plurality of inductors respectively form a plurality of resonant circuits. Different resonant circuits share capacitors, which can reduce volume and manufacturing costs. The switch is used to conduct the connection between the capacitor and one of the plurality of inductors. The power management module is connected to each resonant circuit respectively, and outputs an alternating current whose operating frequency matches the resonant frequency of the target resonant circuit, so that the target resonant circuit starts to oscillate, realizing wireless charging of the powered device, and the connection between the capacitor and the inductor in the target resonant circuit is conducted. The inductor in each resonant circuit can be designed according to actual needs, so that the structure of the wireless charging circuit has high flexibility.

Description

Technical Field

[0001] The present application relates to the field of terminal technology, and in particular to a wireless charging circuit, device, method and computer-readable storage medium. Background Art

[0002] With the development of wireless power transmission technology, wireless charging technology has emerged. Since wireless charging technology can charge in a non-contact manner, it has higher safety, reliability and service life.

[0003] The common charging method in wireless charging devices is resonance. Specifically, the wireless charging device can output an AC current with an operating frequency, so that the resonant circuit composed of a capacitor and an inductor starts to oscillate to achieve wireless charging. However, since the wireless charging device can only output an AC current with an operating frequency, when the wireless charging device includes multiple resonant circuits, there is a problem that the hardware structure of the resonant circuit is limited by the required output AC current operating frequency, which further leads to the problem of high manufacturing cost of the wireless charging device. Summary of the invention

[0004] In view of this, the present application provides a wireless charging circuit, device, method and computer-readable storage medium, which can avoid the hardware structure of the resonant circuit of the wireless charging device being limited by the required output AC current operating frequency.

[0005] In a first aspect, the present application provides a wireless charging circuit, the wireless charging circuit comprising a power management module, a switch, a capacitor, and a plurality of inductors;

[0006] The capacitor is coupled to the plurality of inductors through a switch, and the capacitor and each of the plurality of inductors respectively form a plurality of resonant circuits; the switch is used to conduct the connection between the capacitor and one of the plurality of inductors;

[0007] A power management module is connected to each resonant circuit, and the power management module is used to output an alternating current whose operating frequency matches the resonant frequency of the target resonant circuit; and the connection between the capacitor and the inductor in the target resonant circuit is turned on.

[0008] In the above implementation, the capacitor is coupled to multiple inductors respectively through switches to form multiple resonant circuits. When the switch is in different conduction states, the connection between the capacitor and different inductors is turned on, and the corresponding resonant circuit is turned on. At this time, the power management module can output an AC current that matches the resonant frequency of the turned-on target resonant circuit, so that the target resonant circuit can start to oscillate to achieve wireless charging.

[0009] Furthermore, since only one capacitor is provided in the wireless charging circuit, it can be coupled with different inductors to form different resonant circuits, thereby realizing wireless charging of powered devices of different specifications. Therefore, in the wireless charging circuit that can realize wireless charging of powered devices of different specifications, the manufacturing cost of the wireless charging circuit can be reduced, and the volume of the wireless charging circuit can be reduced.

[0010] In addition, since the operating frequency of the AC current output by the power management module matches the resonant frequency of the target resonant circuit, it can be ensured that the charging efficiency of the wireless charging circuit remains at a high level when each resonant circuit is turned on. Moreover, since the power management module can output an AC current whose operating frequency matches the resonant frequency of the target resonant circuit, when the inductor is limited by space, it can also be ensured that the wireless charging circuit can achieve efficient wireless charging of the powered device.

[0011] In a possible implementation of the first aspect, at least two of the multiple inductors have different inductance values. When multiple inductors are respectively combined with a capacitor to form multiple resonant circuits, the magnetic flux density generated by the inductors with different inductance values ​​is different, so the induced voltage is also different. For example, the magnetic flux density generated by the inductor with a large inductance value is higher, and the induced voltage generated is higher. In this way, when the inductance values ​​of at least two of the multiple inductors are different, it can be ensured that the wireless charging circuit can generate different charging voltages to meet the charging requirements of different powered devices.

[0012] In a possible implementation of the first aspect, among the multiple resonant circuits, the resonant frequencies of at least two resonant circuits are different. When the multiple resonant circuits share the same capacitor, the resonant circuits of at least two resonant circuits are different, indicating that the inductance values ​​of at least two inductors are different. In this way, it can be ensured that the wireless charging circuit can meet the charging requirements of different powered devices.

[0013] In a possible implementation manner of the first aspect, the power management module includes a control port, where the control port is connected to the switch and is used to output a control signal for controlling a conducting state of the switch.

[0014] The on-state of the switch refers to the on-state between the switch-connected capacitor and the inductor. When the connection between the capacitor connected to the switch and the inductor is in the on-state, the switch can be considered to be in the on-state. Since there are multiple inductors in the wireless charging circuit, each inductor is connected to the capacitor through a switch, the switch has multiple on-states. And the number of on-states of the switch is related to the number of inductors. For example, when the switch is in one on-state, the connection between the capacitor connected to the switch and an inductor is in the on-state, and when the switch is in another on-state, the connection between the capacitor connected to the switch and another inductor is in the on-state.

[0015] In the above implementation, the power management module can directly output a control signal for controlling the switch to the switch through the control port to control the conduction state of different resonant circuits. When the power management module controls the switch to make one of the multiple resonant circuits in the conduction state, the wireless charging circuit can wirelessly charge the powered device in the charging area corresponding to the resonant circuit.

[0016] In a second aspect, the present application provides a wireless charging device, the wireless charging device comprising the wireless charging circuit as described in the first aspect and any possible design thereof, a plurality of charging areas, and a powered device detection module;

[0017] The powered device detection module is connected to the power management module in the wireless charging circuit and is used to detect the presence of powered devices in multiple charging areas;

[0018] A power management module, used to determine the target resonant circuit corresponding to the target charging area according to the presence status, and output an AC current whose operating frequency matches the resonant frequency of the target resonant circuit; the target charging area is a charging area where a powered device is present;

[0019] The target resonant circuit is used to generate oscillation based on the AC current to power the powered device.

[0020] In the above implementation, since the operating frequency of the AC current output by the power management module matches the resonant frequency of the target resonant circuit, it can be ensured that the charging efficiency of the wireless charging device remains at a high level when each resonant circuit is turned on. In addition, since the power management module can output an AC current whose operating frequency matches the resonant frequency of the target resonant circuit, when the inductor in the wireless charging circuit is limited by space, it can also be ensured that the wireless charging device can achieve efficient wireless charging of the powered device.

[0021] In addition, since the power management module can output an AC current whose operating frequency matches the resonant frequency of the target resonant circuit, all resonant circuits in the wireless charging circuit of the wireless charging device can share the same capacitor, which can reduce the manufacturing cost of the wireless charging circuit and reduce the volume of the wireless charging circuit. Moreover, the inductor in each resonant circuit can be designed according to the actual space, ensuring that the wireless charging device can generate different charging voltages to meet the charging needs of different powered devices while meeting the hardware space requirements.

[0022] In a possible implementation manner of the second aspect, the wireless charging device further includes a processor, the processor includes a control port, the control port is connected to the switch, and is used to output a control signal that controls a conducting state of the switch.

[0023] In the above implementation process, the wireless charging device can control the conduction state of different resonant circuits through the control signal of the switch conduction state controlled by the processor. Each conduction state of the switch corresponds to the conduction state of a resonant circuit. For example, when the switch is in one conduction state, one resonant circuit is in the conduction state, and when the switch is in another conduction state, another resonant circuit is in the conduction state.

[0024] In a third aspect, the present application provides a wireless charging method, which is applied to a wireless charging device, wherein the wireless charging device includes a plurality of charging areas that can charge a plurality of powered devices, and each charging area is provided with a resonant circuit;

[0025] Wireless charging methods include:

[0026] In response to the presence of a powered device in the target charging area, the resonant frequency of the resonant circuit in the target charging area is determined. The presence of the powered device means that the powered device can be wirelessly charged in the target charging area. The target charging area refers to the charging area where the powered device is in place, and the wireless charging device includes multiple charging areas. An alternating current whose operating frequency matches the resonant frequency is output to the resonant circuit in the target charging area. Each target charging area corresponds to a resonant circuit, and when an alternating current whose operating frequency matches the resonant frequency is input into the resonant circuit, the resonant circuit can start to oscillate to achieve wireless charging.

[0027] In the above implementation, when there is a powered device in the target charging area, the resonant frequency of the resonant circuit in the target charging area can be determined, and based on the resonant frequency, an alternating current whose operating frequency matches the resonant frequency can be output to the resonant circuit corresponding to the target charging area to ensure that the charging efficiency of the resonant circuit corresponding to the target charging area is at a high level.

[0028] In addition, the structure design of the wireless charging device using the wireless charging method is more flexible, which is convenient for reducing manufacturing costs. Moreover, the wireless charging method provided by the embodiment of the present application can make the volume of the wireless charging device smaller.

[0029] In a possible implementation of the third aspect, the method further includes: detecting the presence of powered devices in multiple charging areas. Determining a target charging area from the multiple charging areas based on the presence. By detecting the presence of powered devices in each charging area, the target charging area can be determined when the powered device is in place, so as to control the output of AC current to the resonant circuit corresponding to the target charging area, so as to avoid outputting AC current to the resonant circuit corresponding to the charging area where no powered device is in place, thereby avoiding waste of electric energy.

[0030] In a possible implementation manner of the third aspect, a target charging area is determined from multiple charging areas based on the presence status, including: when there is a charging area with a powered device in place among the multiple charging areas, a charging area is determined as the target charging area; when there are multiple charging areas with powered devices in place among the multiple charging areas, the target charging area is determined from the multiple charging areas according to a preset rule.

[0031] In the above implementation, when there are multiple charging areas with powered devices, in order to ensure normal charging, a target charging area can be determined from the multiple charging areas with powered devices, and it can be ensured that AC current can be output to the resonant circuit corresponding to the target charging area, so that the powered devices in the target charging area are normal.

[0032] In a possible implementation manner of the third aspect, the preset rules include but are not limited to: determining each charging area in multiple charging areas as a target charging area in sequence according to a preset time interval; or determining the charging area corresponding to the powered device with the least remaining power as the target charging area.

[0033] In the above implementation process, the target charging area can be determined by a preset rule, so that when multiple powered devices are in place at the same time, one powered device can be selected from the multiple powered devices for wireless charging.

[0034] In a fourth aspect, the present application provides a wireless charging device, which includes a memory and one or more processors; the memory and the processor are coupled; the memory is used to store computer program code, and the computer program code includes computer instructions; when the processor executes the computer instructions, the wireless charging device executes the method described in the third aspect and any possible design method thereof.

[0035] In a fifth aspect, the present application provides a computer-readable storage medium, comprising computer instructions. When the computer instructions are executed on a wireless charging device, the wireless charging device executes the method described in the third aspect above and any possible design thereof.

[0036] In a sixth aspect, the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, enables the wireless charging device to perform the method described in the third aspect above and any possible design thereof.

[0037] In a seventh aspect, the present application provides a device, which is included in a wireless charging device, and the device has the function of implementing the behavior of the wireless charging device in any of the above aspects and possible implementation methods. The function can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes at least one module or unit corresponding to the above function. For example, a detection module or unit, a scanning module or unit, a recovery module or unit, a moving module or unit, and a storage module or unit, etc.

[0038] In an eighth aspect, an embodiment of the present application provides a chip system, which includes a processor and may also include a memory, for implementing any one of the methods provided in the third to fifth aspects above. The chip system may be composed of a chip, or may include a chip and other discrete devices.

[0039] It can be understood that the wireless charging device described in the second aspect and any possible design thereof provided above, the computer-readable storage medium described in the fifth aspect, and the computer program product described in the sixth aspect are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a tablet computer provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of a wireless charging device structure provided in an embodiment of the present application Figure 1 ;

[0042] Figure 3 A schematic diagram of a wireless charging device structure provided in an embodiment of the present application Figure 2 ;

[0043] Figure 4 A schematic diagram of a circuit topology structure of a wireless charging device provided in an embodiment of the present application;

[0044] Figure 5A schematic diagram of a flow chart of a wireless charging method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0045] In the following, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this embodiment, "at least one" refers to one or more, and "plurality" refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0046] In the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0047] Before introducing the embodiments of the present application, the technologies involved in the embodiments of the present application are first introduced in detail.

[0048] 1. Wireless power transmission, also known as wireless power transmission or contactless power transmission, refers to the process of converting electrical energy into other forms of relay energy such as electromagnetic field energy, laser, microwave and mechanical waves through a transmitter. After the relay energy is transmitted over a certain distance, it is converted back into electrical energy by the receiver, thereby realizing wireless power transmission.

[0049] 2. Wireless charging technology originates from wireless power transmission technology and is a technology that uses wireless power transmission to realize the charging process. Coils are set in both the wireless charging device and the power receiving device. When the wireless charging device starts charging, the coil in the wireless charging device can convert electrical energy into electromagnetic field energy. Afterwards, the coil set in the power receiving device can receive the electromagnetic field energy and convert the electromagnetic field energy into electrical energy. In this way, electrical energy is transmitted from the wireless charging device to the power receiving device, and the power receiving device stores or uses the electrical energy, thereby realizing wireless charging.

[0050] In some embodiments, multiple coils may be provided in the wireless charging device to realize charging of multiple powered devices with different charging specifications. For example, in some scenarios, the wireless charging device is a tablet computer, and the powered device is a stylus pen, a wireless keyboard and other peripherals. The tablet computer is provided with a wireless charging device, and the wireless charging device forms a charging area on the outer shell of the tablet computer. The stylus pen, wireless keyboard and other peripherals can be adsorbed on the wireless charging area on the outer shell of the tablet computer by means of magnetism, snaps, etc., so that the tablet computer can wirelessly charge the stylus pen, wireless keyboard and other peripherals.

[0051] like Figure 1 As shown, a display screen is provided on the front of the tablet computer. A first coil for charging a wireless keyboard in a wireless charging device is provided on the back of the tablet computer. The first coil can form a first charging area 101 on the back shell of the tablet computer. In addition, a magnetic area 102 for adsorbing the wireless keyboard is provided on the back shell of the tablet computer. Correspondingly, a magnetic area with a polarity opposite to that of the magnetic area 102 is also provided on the wireless keyboard. In this way, the wireless keyboard can be adsorbed on the first charging area 101 on the back shell of the tablet computer by magnetic attraction, and the first charging area 101 of the tablet computer can charge the wireless keyboard. A second coil for charging a stylus in a wireless charging device is provided on the side of the tablet computer. The second coil can form a second charging area 103 on the side shell of the tablet computer. In addition, a magnetic area 104 for adsorbing the stylus is also provided on the side shell of the tablet computer. Correspondingly, a magnetic area with a polarity opposite to that of the magnetic area 104 is also provided on the stylus. In this way, the stylus can be adsorbed on the second charging area 103 on the side shell of the tablet computer by magnetic attraction, and the second charging area 103 of the tablet computer can charge the stylus.

[0052] Wireless charging technology can use resonant devices to achieve wireless charging.

[0053] In some embodiments, each charging area corresponds to a resonant circuit, each resonant circuit corresponds to a powered device, and each resonant circuit includes at least a capacitor and an inductor.

[0054] In the resonant circuit, in order to ensure the highest charging efficiency of the resonant circuit and avoid energy waste, it is necessary to ensure that the operating frequency of the alternating current output by the power output module is equal to or close to the resonant frequency of the resonant circuit composed of capacitors and inductors. If the operating frequency of the alternating current output by the power output module is equal to the resonant frequency of the resonant circuit composed of capacitors and inductors, the current value in the circuit will be the largest, and there may be a problem of circuit damage. Therefore, in actual applications, the difference between the operating frequency of the alternating current output by the power output module and the resonant frequency of the resonant circuit composed of capacitors and inductors is greater than zero and less than a preset threshold.

[0055] Furthermore, the wireless keyboard can contact a larger area with the tablet computer, while the stylus can contact a smaller area with the tablet computer. Figure 1 As shown in FIG. 1 , the area of ​​the first charging area 101 for charging the wireless keyboard is larger than the area of ​​the second charging area 103 for charging the stylus. In other words, the volume of the inductor corresponding to the first charging area 101 is larger than the volume of the inductor corresponding to the second charging area 103, and thus, the inductance value of the inductor corresponding to the first charging area 101 is larger than the inductance value of the inductor corresponding to the second charging area 103.

[0056] It can be seen that if the wireless charging device needs to charge powered devices with different charging specifications, the wireless charging device needs to be equipped with inductors of different sizes.

[0057] Furthermore, the power output module can only output an alternating current with one operating frequency, and the difference between the operating frequency of the alternating current output by the power output module and the resonant frequency of the resonant circuit composed of the capacitor and the inductor is greater than zero and less than a preset threshold value, so as to ensure a high charging efficiency. Then, in the case where inductors of different sizes are provided in the wireless charging device, in order to ensure that the charging efficiency of the resonant circuit where each inductor is located is the highest, the resonant frequency that needs to be set for the resonant circuit is determined according to the operating frequency of the alternating current output by the power output module, and then the capacitance value of the capacitor in each resonant circuit is determined based on the inductance value and resonant frequency of the inductor in each resonant circuit. In this way, it can be ensured that when the power output module outputs an alternating current with one operating frequency, the wireless charging device can power receiving devices of different specifications.

[0058] The resonant frequency of a resonant circuit is related to the capacitance of the capacitor and the inductance of the inductor, which is an inherent characteristic of the resonant circuit. The specific formula for calculating the resonant frequency is as follows:

[0059]

[0060] in, represents the resonant frequency, L represents the inductance value, C represents the capacitance value,

[0061] For example, when the inductance value of the inductor in the resonant circuit corresponding to the stylus pen is 20Uh, the inductance value of the inductor in the resonant circuit corresponding to the wireless keyboard is 10Uh, and the operating frequency of the AC current output by the power output module is 103KHz. According to the resonant frequency calculation formula, it can be calculated that when the capacitance value of the capacitor in the resonant circuit corresponding to the stylus pen is 113nF, the resonant frequency of the resonant circuit corresponding to the stylus pen is 105KHz. At this time, the charging efficiency of the stylus pen can be guaranteed to be high. According to the resonant frequency calculation formula, it can be calculated that when the capacitance value of the capacitor in the resonant circuit corresponding to the wireless keyboard is 247nF, the resonant frequency of the resonant circuit corresponding to the wireless keyboard is 101KHz. At this time, the charging efficiency of the wireless keyboard can be guaranteed to be high.

[0062] That is to say, in the above wireless charging scheme, in order to ensure that the wireless charging device can power receiving devices of different specifications, it is necessary to set the size of the inductor according to the volume of the wireless charging device and the receiving device. Then, a capacitor is configured according to the inductor set in each resonant circuit. In this way, the wireless charging scheme is limited by hardware and cannot be configured flexibly. Moreover, each resonant circuit needs to be configured with capacitors of different sizes according to the size of the inductor, resulting in a high manufacturing cost of the wireless charging device. In addition, the wireless charging device needs to provide accommodation space for the hardware in the resonant circuit, which makes it difficult to further reduce the volume of the wireless charging device.

[0063] To this end, the present application provides a wireless charging method, which can detect the presence of a powered device in the charging area to determine the resonant frequency of the resonant circuit corresponding to the target charging area where the powered device is located, and then output an alternating current whose operating frequency matches the resonant frequency, so that the charging efficiency of each target charging area can be guaranteed to be at a high level. In addition, the hardware structure of the wireless charging device using the wireless charging method is not limited by the operating frequency of the alternating current, so the design of the hardware structure can be more flexible, and the manufacturing cost and the volume of the wireless charging device can be reduced according to actual needs.

[0064] The wireless charging method provided in the embodiment of the present application can be applied to wireless charging devices. The wireless charging device can specifically be a wireless charger, a mobile phone, a tablet computer, a smart screen, a laptop computer, a vehicle-mounted device, a wearable device (such as a smart watch), an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an artificial intelligence (artificial intelligence) device, and other devices with wireless charging and power supply functions. The application embodiment does not limit the specific type of the wireless charging device 100. In addition, when an operating system is installed in the wireless charging device, there is no limitation on the operating system installed in the wireless charging device.

[0065] The following is an introduction to wireless charging equipment.

[0066] like Figure 2 As shown, in the case where the wireless charging device is a wireless charger, the wireless charger may include a power management module, multiple resonant circuits, and a powered device detection module. A powered device detection module is provided in the charging area corresponding to each resonant circuit, and the powered device detection module may detect whether there is a powered device in the charging area. When the powered device detection module detects that there is a powered device in a certain charging area, the power management module may output a corresponding current. The operating frequency of the current output by the power management module corresponds to the resonant frequency of the resonant circuit corresponding to the charging area where the powered device is located.

[0067] In some examples, the powered device detection module may be a magnetic sensor. For example, the magnetic sensor may detect whether the powered device is in place by determining whether the powered device is adsorbed in the charging area.

[0068] Among them, matching the operating frequency of the current output by the power management module with the resonant frequency of the resonant circuit corresponding to the charging area where the powered device is located means that the difference between the operating frequency of the current output by the power management module and the resonant frequency of the resonant circuit corresponding to the charging area where the powered device is located is greater than zero and less than a preset threshold.

[0069] When the wireless charging device is a terminal device such as a mobile phone, tablet computer, smart screen, laptop computer, or vehicle-mounted device, Figure 3As shown, the wireless charging device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a sensor module 180, an indicator 192, a camera, a display screen, etc.

[0070] It is understood that the structure illustrated in the embodiment of the present invention does not constitute a specific limitation on the wireless charging device 100. In other embodiments of the present application, the wireless charging device 100 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0071] The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (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. Different processing units may be independent devices or integrated into one or more processors.

[0072] The controller may be the nerve center and command center of the wireless charging device 100. The controller may generate an operation control signal according to the instruction operation code and the timing signal to complete the control of fetching and executing instructions.

[0073] The processor 110 may also be provided with a memory for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may store instructions or data that the processor 110 has just used or cyclically used. If the processor 110 needs to use the instruction or data again, it may be directly called from the memory. This avoids repeated access, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0074] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the wireless charging device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function.

[0075] The internal memory 121 can be used to store computer executable program codes, which include instructions. The processor 110 executes various functional applications and data processing of the wireless charging device 100 by running the instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area can store data created during the use of the wireless charging device 100 (such as audio data, a phone book, etc.), etc. In addition, the internal memory 121 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, a universal flash storage (UFS), etc.

[0076] In some embodiments, the processor 110 may include one or more interfaces. The interface may include an inter-integrated circuit (I2C) interface, an inter-integrated circuit sound (I2S) interface, a pulse code modulation (PCM) interface, a universal asynchronous receiver / transmitter (UART) interface, a mobile industry processor interface (MIPI), a general-purpose input / output (GPIO) interface, a subscriber identity module (SIM) interface, and / or a universal serial bus (USB) interface, etc.

[0077] The USB interface 130 is an interface that complies with USB standard specifications, and may be a Mini USB interface, a Micro USB interface, a USB Type C interface, etc. The USB interface 130 may be used to connect a charger to charge the wireless charging device 100, and may also be used to transmit data between the wireless charging device 100 and peripheral devices.

[0078] It is understandable that the interface connection relationship between the modules illustrated in the embodiment of the present invention is only a schematic illustration and does not constitute a structural limitation on the wireless charging device 100. In other embodiments of the present application, the wireless charging device 100 may also adopt different interface connection methods in the above embodiments, or a combination of multiple interface connection methods.

[0079] The charging management module 140 is 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 through the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive wireless charging input through a wireless charging coil of the wireless charging device 100. While the charging management module 140 is charging the battery 142, it may also power the wireless charging device 100 itself through the power management module 141.

[0080] The power management module 141 is used to connect to the battery 142. The power management module 141 receives input from the battery 142 and / or the charging management module 140 to power the processor 110, the internal memory 121, the external memory, the display screen, the camera, and the wireless communication module 160. The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc. In some other embodiments, the power management module 141 can also be set in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 can also be set in the same device.

[0081] In some wireless power supply embodiments, the charging management module 140 can send power through the wireless power supply coil of the wireless charging device 100 to power other powered devices. In the embodiment of the present application, the power management module 141 can output currents of multiple operating frequencies.

[0082] The sensor module 180 can detect whether there is a powered device in the charging area of ​​the wireless charging device 100. When the sensor module 180 detects that there is a powered device in a charging area, the power management module 141 can output an AC current accordingly. The operating frequency of the current output by the power management module 141 matches the resonant frequency of the resonant circuit corresponding to the charging area where the powered device is located.

[0083] The sensor module 180 may be a magnetic sensor 180D. The magnetic sensor 180D includes a Hall sensor. The wireless charging device 100 may use the magnetic sensor 180D to detect whether there is a powered device in the charging area.

[0084] Indicator 192 may be an indicator light, which may be used to indicate charging status, power changes, messages, missed calls, notifications, etc.

[0085] In the embodiment of the present application, the wireless communication function of the wireless charging device 100 can be implemented through antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, modulation and demodulation processor and baseband processor. The display function of the wireless charging device 100 can be implemented by GPU, display screen, and application processor. The audio function of the wireless charging device 100 can be implemented by audio module 170, speaker, receiver, microphone, headphone jack, and application processor. For details, please refer to the relevant technology, which will not be repeated here.

[0086] The following introduces a wireless charging circuit provided in an embodiment of the present application.

[0087] The present application embodiment still takes the wireless charging device as a tablet computer, and the tablet computer can power the stylus and the wireless keyboard through wireless charging as an example for explanation. Figure 4 The wireless charging circuit shown includes a power management module, a single-pole double-throw switch K, a capacitor C, a first inductor L1 and a second inductor L2. The power management module can output alternating currents of different operating frequencies.

[0088] When the terminals 1 and 2 of the single-pole double-throw switch K are connected, the tablet computer can charge the stylus. The power management module can output an alternating current I1 with a first operating frequency, and the resonant circuit composed of the capacitor C and the first inductor L1 starts to oscillate. The first inductor L1 can convert electrical energy into electromagnetic field energy, so an electromagnetic field is generated around the first inductor L1. At this time, if a stylus is adsorbed on the charging area corresponding to the first inductor L1, the electromagnetic field energy converted by the first inductor L1 will be converted into electrical energy by the stylus and stored in the energy storage battery in the stylus.

[0089] When the terminals 1 and 3 of the single-pole double-throw switch K are connected, the tablet computer can charge the wireless keyboard. The power management module can output an AC current I2 with a second frequency, and the resonant circuit composed of the capacitor C and the second inductor L2 starts to oscillate. The second inductor L2 can convert electrical energy into electromagnetic field energy, so an electromagnetic field is generated around the second inductor L2. At this time, if a wireless keyboard is adsorbed on the charging area corresponding to the second inductor L2, the electromagnetic field energy converted by the second inductor L2 will be converted into electrical energy by the wireless keyboard and stored in the energy storage battery in the wireless keyboard.

[0090] It can be understood that the wireless charging circuit may include multiple resonant circuits, wherein the resonant frequencies of at least two resonant circuits may be different.

[0091] Accordingly, in the case where a plurality of resonant circuits are included in the wireless charging circuit, the wireless charging circuit includes a switch for turning on one of the plurality of resonant circuits.

[0092] In some embodiments, the power management module may include a control port for controlling a switch, and the control port is connected to the switch, so that the power management module can control the switch through the control port. For example, when the power management module detects that a powered device is in the charging area corresponding to the resonant circuit A, the power management module can control the switch through the control port so that the resonant circuit A is in a conducting state.

[0093] In the above embodiment, the control port can output a control signal for controlling the conduction state of the switch. The conduction state of the switch refers to the state in which the switch connects the capacitor and the target inductor. The conduction state of the switch corresponds to the number of resonant circuits or the number of inductors. For example, a switch connects a capacitor and multiple inductors. When the switch is in the first conduction state, the connection between the capacitor and the first inductor among the multiple inductors is conducted, the connection between the capacitor and the other inductors is disconnected, and the first resonant circuit composed of the capacitor and the first inductor is in the conduction state. When the switch is in the second conduction state, the connection between the capacitor and the second inductor among the multiple inductors is conducted, the connection between the capacitor and the other inductors is disconnected, and the second resonant circuit composed of the capacitor and the second inductor is in the conduction state. When the switch is in the Nth conduction state, the connection between the capacitor and the Nth inductor among the multiple inductors is conducted, the connection between the capacitor and the other inductors is disconnected, and the Nth resonant circuit composed of the capacitor and the Nth inductor is in the conduction state.

[0094] In some examples, the switch may include a control terminal, an input terminal, and multiple output terminals. The control terminal is connected to a device for controlling the on-state of the switch. The input terminal of the switch is connected to a capacitor, and each output terminal of the switch is connected to an inductor. For example, in the case where the power management module controls the switch through a control port, the control port of the power management module is connected to the control terminal of the switch. In addition, the output terminal of the power management module for outputting alternating current is connected to the input terminal of the switch through a capacitor, and each output terminal of the switch is connected to the input terminal of the power management module through an inductor. The number of the switch output terminals is the same as the number of the inductors.

[0095] In some other examples, the wireless charging circuit may also include a switch control module for controlling the switch. When a powered device is in the charging area corresponding to the resonant circuit, the switch control module may control the switch so that the resonant circuit corresponding to the charging area where the powered device is in place is turned on. In addition, at this time, the power management module may output an alternating current whose operating frequency matches the resonant frequency of the resonant circuit. Exemplarily, when the switch has a control end, the switch control module may be connected to the control end of the switch to achieve control of the switch.

[0096] In some embodiments, the wireless charging circuit may further include a powered device detection module, which may detect whether a powered device is present in the charging area corresponding to each resonant circuit. The powered device detection module is connected to the power management module, and the powered device detection module may send the detection result of whether a powered device is present in the charging area corresponding to each resonant circuit to the power management module, so that the power management module may control the resonant circuit to be in a conducting state according to the detection result of whether a powered device is present in the charging area corresponding to each resonant circuit.

[0097] When the inductance value of the first inductor L1 is different from the inductance value of the second inductor L2, as Figure 4 The resonant frequency of the resonant circuit composed of the first inductor L1 and the capacitor C shown is also different from the resonant frequency of the resonant circuit composed of the second inductor L2 and the capacitor C. However, since the power management module can output AC currents of different operating frequencies, when the tablet computer is charging a stylus, the power management module can output an AC current with an operating frequency close to the resonant frequency of the resonant circuit composed of the first inductor L1 and the capacitor C; when the tablet computer is charging a wireless keyboard, the power management module can output an AC current with an operating frequency close to the resonant frequency of the resonant circuit composed of the second inductor L2 and the capacitor C. In this way, two different resonant circuits can share a capacitor in the wireless charging circuit, thereby reducing the manufacturing cost of the wireless charging circuit.

[0098] The following combination Figure 5 The wireless charging method provided in the embodiment of the present application is introduced.

[0099] Figure 5 A flow chart of a wireless charging method provided in an embodiment of the present application, the method is performed by a wireless charging device, and includes the following steps:

[0100] S501, detecting the presence of powered devices in all charging areas.

[0101] Wireless charging equipment can detect the presence of powered devices in the charging area through wireless induction. Figure 2 The powered device detection module in Figure 3 The sensor modules 180 in the embodiment can detect the powered device.

[0102] S502: Determine the resonant frequency of the resonant circuit corresponding to the target charging area where the powered device is currently located.

[0103] In some embodiments, the wireless charging device pre-stores the resonant frequency of the resonant circuit corresponding to each charging area, so the wireless charging device can directly obtain the resonant frequency of the resonant circuit corresponding to the target charging area by querying.

[0104] It can be understood that when the wireless charging device has been manufactured, the charging area of ​​the wireless charging device has been determined, and the hardware structure of the resonant circuit of each charging area has also been determined. According to the resonant frequency calculation formula, the resonant frequency of the resonant circuit corresponding to the target charging area has also been determined. Therefore, the wireless charging device can know the resonant frequency of the resonant circuit corresponding to each charging area before leaving the factory, and store it in the built-in memory.

[0105] S503: Outputting an alternating current whose operating frequency matches the resonant frequency to the resonant circuit corresponding to the target charging area.

[0106] The alternating current whose operating frequency matches the resonant frequency refers to an alternating current whose difference between the operating frequency and the resonant frequency is greater than zero and less than a preset threshold.

[0107] The preset threshold can be determined based on actual application experience. For example, through a large number of tests, developers have found that when the difference between the operating frequency and the resonant frequency is greater than zero and less than 10KHz, the wireless charging efficiency can be maintained at a high level. In this case, the preset threshold here is 10KHz.

[0108] In some examples, the wireless charging device can also update the preset threshold value that has been set according to the latest update data released by the developer. For example, when the tablet computer is first shipped, the stored preset threshold value is 10KHz. After that, after the latest update data is downloaded and installed in the tablet computer, the preset threshold value updated in the tablet computer is 5KHz.

[0109] In some embodiments, when the wireless charging device executes S503, it can calculate the operating frequency range of the AC current to be output according to the preset threshold and the resonant frequency, and then control the operating frequency of the output AC current based on the calculated operating frequency. For example, the tablet computer calculates that the operating frequency of the AC current to be output is 103KHz-105KHz according to the preset threshold and the resonant frequency, then when the tablet computer outputs the AC current, it can be known that the operating frequency of the AC current can be kept within 103KHz-105KHz.

[0110] In other embodiments, when the wireless charging device can output multiple AC currents with different determined operating frequencies, the wireless charging device can select a suitable operating frequency from the multiple operating frequencies according to the resonant frequency of the resonant circuit corresponding to the target charging area, and output the AC current. For example, the wireless charging device can output AC currents of 50KHz, 80KHz, and 100KHz. If the resonant frequency of the resonant circuit corresponding to the target charging area is 55KHz, and the difference between 55KHz and 50KHz is the smallest, then the wireless charging device can determine 50KHz as the appropriate operating frequency and output an AC current with an operating frequency of 50KHz.

[0111] Among them, the wireless charging device can output different operating frequencies by switching. For example, as in the above example, the wireless charging device determines that the resonant frequency of the resonant circuit corresponding to the target charging area is 55 KHz, and selects 50KHz as the appropriate operating frequency. Then, the wireless charging device can inform the power management module for outputting AC current to switch the output to the 50KHz output port. In some examples, the power management module can obtain instructions for switching the operating frequency through the IO port.

[0112] In some embodiments, since the wireless charging method can output an alternating current whose operating frequency matches the resonant frequency, thereby causing the resonant circuit to start oscillating, the resonant frequency of the resonant circuit in the wireless charging device can be determined according to actual needs, without having to determine the size of the resonant frequency based on the operating frequency of the alternating current.

[0113] Furthermore, since the resonant frequency of the resonant circuit is determined by the inductance value of the inductor and the capacitance value of the capacitor, the inductance value of the inductor and the capacitance value of the capacitor can be determined according to actual needs. In this way, the inductor and capacitor of the resonant circuit in the wireless charging device can be set according to actual needs, and the charging efficiency of each resonant circuit is ensured to be at a high level, without the need to select the inductor and capacitor used to form the resonant circuit according to the determined resonant frequency.

[0114] In some examples, when each resonant circuit of the tablet computer includes a capacitor and an inductor, since the power management module can output AC currents of multiple operating frequencies, the resonant frequencies of each resonant circuit may be different or dissimilar. Dissimilar means that the difference between the resonant frequencies of the two resonant circuits may be greater than a preset threshold.

[0115] For example, the inductance value of the inductor in the resonant circuit corresponding to the stylus pen is 20Uh, and the inductance value of the inductor in the resonant circuit corresponding to the wireless keyboard is 10Uh. Then, the capacitance value of the capacitor in the resonant circuit corresponding to the stylus pen and the capacitance value of the capacitor in the resonant circuit corresponding to the wireless keyboard can be set arbitrarily.

[0116] Furthermore, the inductors in each resonant circuit in the wireless charging device may also share the same capacitor. Figure 4 As shown, the specific content can be found in the above introduction and will not be repeated here.

[0117] Thus, the wireless charging method provided in the embodiment of the present application can make the structural design of the wireless charging circuit more flexible, which is convenient for reducing the manufacturing cost. In addition, the wireless charging method provided in the embodiment of the present application can make the volume of the wireless charging device smaller.

[0118] In the above embodiment, after the wireless charging device executes S501, the following two situations may occur.

[0119] In one case of the above embodiment, the wireless charging device may determine that there is only one charging area with a powered device currently located. In this case, the wireless charging device can directly use the charging area with the powered device as the target charging area and execute the above S502 and S503.

[0120] In some examples, the tablet computer can charge a stylus pen and a wireless keyboard, and the tablet computer detects that the stylus pen is attached to the corresponding charging area, and the wireless keyboard is not attached to the corresponding area. Then the tablet computer can use the charging area where the stylus pen is located as the target charging area, and determine the resonant frequency of the resonant circuit corresponding to the target charging area where the stylus pen is located. After that, the tablet computer can output an AC current whose operating frequency matches the resonant frequency. For example, if the resonant frequency of the resonant circuit corresponding to the target charging area where the stylus pen is located is 88KHz, then the tablet computer can output an AC current with an operating frequency of 90KHz.

[0121] Similarly, when the tablet computer detects that the wireless keyboard is attached to the corresponding charging area, and the stylus is not attached to the corresponding area, the tablet computer can use the charging area where the wireless keyboard is located as the target charging area, and determine the resonant frequency of the resonant circuit corresponding to the target charging area where the wireless keyboard is located. After that, the tablet computer can output an AC current whose operating frequency matches the resonant frequency. For example, if the resonant frequency of the resonant circuit corresponding to the target charging area where the wireless keyboard is located is 110KHz, then the tablet computer can output an AC current with an operating frequency of 108KHz.

[0122] In one case of the above embodiment, the wireless charging device may determine that there are multiple charging areas where each of the charging areas has a powered device. In this case, the wireless charging device may determine a target charging area from the multiple charging areas where the powered device is located according to a preset rule, and then execute the above S502 and S503.

[0123] The preset rules include but are not limited to any one of the following: time division multiplexing rules, power-based rules, etc.

[0124] In the following, taking the scenario where a tablet computer can charge a stylus pen and a wireless keyboard, and the tablet computer detects that both the stylus pen and the wireless keyboard are attached to the charging area as an example, the specific implementation of the wireless charging device determining a target charging area from multiple charging areas where powered devices are located according to preset rules is introduced.

[0125] In some embodiments, the tablet computer may determine the target charging area using a time division multiplexing rule, that is, the tablet computer may determine each charging area in the charging areas corresponding to the stylus pen and the wireless keyboard as the target charging area in turn according to a preset time interval. For example, the tablet computer may select the charging area corresponding to the stylus pen as the target charging area in the first time period, select the charging area corresponding to the wireless keyboard as the target charging area in the second time period, and then alternately select the charging area corresponding to the stylus pen and the wireless keyboard as the target charging area in each subsequent time period.

[0126] In other embodiments, the tablet computer may determine the target charging area using a rule based on power. Exemplarily, the tablet computer may determine the charging area corresponding to the powered device with the least remaining power as the target charging area. For example, the tablet computer may obtain the current power of the stylus pen and the current power of the wireless keyboard. When the current power of the stylus pen is lower than the current power of the wireless keyboard, the tablet computer selects the charging area corresponding to the stylus pen as the target charging area; when the current power of the wireless keyboard is lower than the current power of the stylus pen, the tablet computer selects the charging area corresponding to the wireless keyboard as the target charging area.

[0127] In some cases, when the number of powered devices with the least remaining power is at least two, the wireless charging device can select any one of the powered devices with the least remaining power and the corresponding charging area as the target charging area. Alternatively, the wireless charging device can select the charging area corresponding to the powered device with a higher charging priority from the powered devices with the least remaining power as the target charging area. The charging priority can be pre-set or set by the user according to his or her own needs. For example, the developer found out based on the user's usage demand survey that the user uses the stylus for a long time, so the charging priority of the stylus can be set to be higher than the charging priority of the wireless keyboard. For another example, in the wireless charging device interface displayed on the tablet computer, the user can select the option to give priority to charging the wireless keyboard. At this time, the charging priority of the wireless keyboard is set to be higher than the charging priority of the stylus.

[0128] In the above embodiment, after the wireless charging device determines a target charging area from multiple charging areas, it can control the resonant circuit corresponding to the target charging area to be in a conducting state. Figure 3 The processor 110 of the electronic device shown includes a control port, which is connected to the switch and is used to output a control signal for controlling the conduction state of the switch.

[0129] In some embodiments, Figure 4 As shown, when the tablet computer determines that the wireless keyboard is the target charging area, the tablet computer can connect the terminal 1 and the terminal 3 of the single-pole double-throw switch K, so that the resonant circuit corresponding to the wireless keyboard is in a conducting state. The control connection between the tablet computer and the single-pole double-throw switch K is not shown.

[0130] Through the above scheme, the wireless charging device can be flexibly designed according to actual needs. In addition, the inductor in each resonant circuit in the wireless charging device can share the same capacitor, so that the manufacturing cost of the wireless charging device can be reduced. Furthermore, since the wireless charging device that performs the above wireless charging method does not have high hardware requirements, the space required to accommodate the hardware in the resonant circuit in the wireless charging device can be further reduced, so that the volume of the wireless charging device can be further reduced.

[0131] An embodiment of the present application also provides a computer-readable storage medium, which includes computer instructions. When the computer instructions are executed on the above-mentioned wireless charging device, the wireless charging device executes each function or step in the above-mentioned method embodiment.

[0132] The embodiment of the present application also provides a computer program product, including a computer program. When the computer program is executed on an electronic device, the wireless charging device executes each function or step in the above method embodiment.

[0133] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0134] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0135] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0136] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0137] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0138] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A wireless charging circuit, characterized in that: The wireless charging circuit includes a power management module, a switch, a capacitor, and a plurality of inductors; The capacitor is coupled to the plurality of inductors through the switch, and the capacitor and each of the plurality of inductors respectively form a plurality of resonant circuits; the switch is used to conduct the connection between the capacitor and one of the plurality of inductors; The power management module is connected to each resonant circuit, and the power management module is used to output an alternating current whose operating frequency matches the resonant frequency of the target resonant circuit; the connection between the capacitor and the inductor in the target resonant circuit is turned on; Wherein, the multiple inductors include a first inductor and a second inductor; when the switch turns on the first inductor and the capacitor, the capacitor and the first inductor form a first resonant circuit, and the power management module outputs an AC current of a first operating frequency; when the switch turns on the second inductor and the capacitor, the capacitor and the second inductor form a second resonant circuit, and the power management module outputs an AC current of a second operating frequency; the resonant frequency of the first resonant circuit is different from the resonant frequency of the second resonant circuit, and the first operating frequency is different from the second operating frequency.

2. The wireless charging circuit according to claim 1, characterized in that: At least two of the plurality of inductors have different inductance values.

3. The wireless charging circuit according to claim 1 or 2, characterized in that: Among the multiple resonant circuits, resonant frequencies of at least two of the resonant circuits are different.

4. The wireless charging circuit according to claim 1 or 2, characterized in that: The power management module includes a control port, which is connected to the switch and is used to output a control signal for controlling the conduction state of the switch.

5. A wireless charging device, characterized in that: The wireless charging device comprises a wireless charging circuit according to any one of claims 1 to 4, a plurality of charging areas, and a powered device detection module; The powered device detection module is connected to the power management module in the wireless charging circuit, and is used to detect the presence of powered devices in the multiple charging areas; The power management module is used to determine the target resonant circuit corresponding to the target charging area according to the presence status, and output an alternating current whose operating frequency matches the resonant frequency of the target resonant circuit; the target charging area is a charging area where a powered device is present; The target resonant circuit is used to generate oscillation based on the alternating current to power a powered device.

6. The wireless charging device according to claim 5, characterized in that: The device further includes a processor, wherein the processor includes a control port, wherein the control port is connected to the switch and is used to output a control signal for controlling the conduction state of the switch.

7. A wireless charging method, characterized in that: Applied to a wireless charging device, the wireless charging device comprises a plurality of charging areas capable of charging a plurality of powered devices, each of the charging areas being provided with a resonant circuit; The wireless charging method comprises: In response to a powered device being present in a target charging area, determining a resonant frequency of a resonant circuit in the target charging area; Outputting an alternating current having an operating frequency matching the resonant frequency to a resonant circuit in the target charging area; The resonant circuit includes a first resonant circuit and a second resonant circuit, and the resonant frequency of the first resonant circuit is different from the resonant frequency of the second resonant circuit; the wireless charging device also includes a switch, and the switch is used to turn on the first resonant circuit or the second resonant circuit; The step of outputting an alternating current having an operating frequency matching the resonant frequency to the resonant circuit of the target charging area includes: When the switch turns on the first resonant circuit, an alternating current of a first operating frequency is output to the first resonant circuit; When the switch turns on the second resonant circuit, an alternating current of a second operating frequency is output to the second resonant circuit; The first operating frequency is different from the second operating frequency.

8. The method according to claim 7, characterized in that The method further comprises: Detecting the presence of powered devices in the multiple charging areas; A target charging area is determined from among the plurality of charging areas based on the presence status.

9. The method according to claim 8, characterized in that The determining a target charging area from the plurality of charging areas based on the presence status includes: If there is a charging area with a powered device in place among the multiple charging areas, determining the charging area as a target charging area; In the case that there are multiple charging areas with powered devices in the multiple charging areas, a target charging area is determined from the multiple charging areas according to a preset rule.

10. The method according to claim 9, characterized in that The preset rules include but are not limited to: sequentially determining each of the plurality of charging areas as a target charging area at a preset time interval; Alternatively, the charging area corresponding to the powered device with the least remaining power is determined as the target charging area.

11. A wireless charging device, characterized in that: The wireless charging device includes a memory and one or more processors; the memory and the processor are coupled; the memory is used to store computer program code, and the computer program code includes computer instructions; when the processor executes the computer instructions, the wireless charging device executes the method described in any one of claims 7-10.

12. A computer-readable storage medium, characterized in that: The method comprises computer instructions, and when the computer instructions are executed on a wireless charging device, the wireless charging device is caused to execute the method according to any one of claims 7 to 10.

13. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the wireless charging device is caused to perform the method according to any one of claims 7 to 10.

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