Wireless transmitter chip, wireless charging circuit, electronic equipment and system

Abstract

This application provides a wireless transmitting chip, a wireless charging circuit, an electronic device, and a system that can save circuit board area. The circuit includes: a second transmitting coil; and a wireless transmitting chip including a processing circuit, a first MOS switch, and a second MOS switch; wherein the processing circuit is used to acquire the battery voltage of a first electronic device and generate an AC voltage based on the battery voltage; the processing circuit is connected to the first transmitting coil via the first MOS switch, and the processing circuit is connected to the second transmitting coil via the second MOS switch; wherein, when the first MOS switch is on and the second MOS switch is off, the first transmitting coil is used to wirelessly charge the second electronic device based on the AC voltage; and when the second MOS switch is on and the first MOS switch is off, the second transmitting coil is used to wirelessly charge a third electronic device based on the AC voltage.

Description

Technical Field

[0001] This application relates to the field of electronic equipment technology, and in particular to a wireless transmitting chip, a wireless charging circuit, an electronic device, and a system. Background Technology

[0002] To enhance the user experience, some electronic devices are often used in conjunction with other devices. For example, tablet computers can be equipped with various accessories, such as wireless keyboards and electronic styluses, to enable different forms of input.

[0003] For ease of use, electronic devices can wirelessly charge their accessories. Currently, the wireless charging circuitry for various electronic devices is located on the device's circuit board. However, as electronic devices become thinner and lighter, reducing the area of ​​the circuit board has become a pressing issue. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a wireless transmitting chip, a wireless charging circuit, an electronic device, and a system. These features can reduce the circuit board area and improve the thinness and lightness of the electronic device.

[0005] In a first aspect, this application provides a wireless charging circuit, characterized in that the wireless charging circuit is applied to a first electronic device, and the wireless charging circuit includes: a first transmitting coil; a second transmitting coil; and a wireless transmitting chip. The wireless transmitting chip includes a processing circuit, a first MOS switch, and a second MOS switch. The processing circuit is used to acquire the battery voltage of the first electronic device and generate an AC voltage based on the battery voltage. The processing circuit is connected to the first transmitting coil via the first MOS switch. The processing circuit is also connected to the second transmitting coil via the second MOS switch. When the first MOS switch is turned on and the second MOS switch is turned off, the first transmitting coil is used to wirelessly charge the second electronic device based on the AC voltage. When the second MOS switch is turned on and the first MOS switch is turned off, the second transmitting coil is used to wirelessly charge a third electronic device based on the AC voltage.

[0006] This wireless charging circuit integrates the first PMOS transistor Q11 and the second PMOS transistor Q12 within the TX chip, eliminating the need for separate MOS transistors on the outside of the TX chip. This simplifies the external circuit design and saves PCB board space. Furthermore, the integration density of the circuitry inside the TX chip is higher than that on the PCB board, further reducing the PCB board area and saving costs.

[0007] For example, the electronic device can be a first electronic device that performs wireless charging at a first power, i.e., an electronic device that performs wireless charging at a low power. Compared to a second electronic device that performs wireless charging at a second power, the first power is less than the second power. For example, the first power can be 1~5W. For example, the first electronic device can be an electronic device that wirelessly charges accessories, such as a tablet computer, an earphone case, etc.

[0008] For example, the processing circuit may include an inverter circuit 231. Optionally, the inverter circuit may be an inverter full bridge composed of multiple MOS switches connected together.

[0009] For example, the first transmitting coil may be a first transmitting coil L11, and the second transmitting coil may be a second transmitting coil L12. The first transmitting coil may correspond to the first receiving coil in the second electronic device, and the second transmitting coil may correspond to the second receiving coil in the third electronic device.

[0010] Specifically, one end of the first transmitting coil can be connected to the first output terminal of the processing circuit via a first capacitor, and the other end of the first transmitting coil can be connected to the second output terminal of the processing circuit via a first MOS switch. One end of the second transmitting coil can be connected to the first output terminal of the processing circuit via a second capacitor, and the other end of the second transmitting coil can be connected to the second output terminal of the processing circuit via a second MOS switch.

[0011] The first transmitting coil, the first capacitor, and the first MOS switch can be set on the same wireless charging path (or resonant circuit), and the first MOS switch is used to control the conduction or disconnection of the wireless charging path.

[0012] The second transmitting coil, the second capacitor, and the second MOS switch can be set on the same wireless charging path (or resonant circuit), and the second MOS switch is used to control the conduction or disconnection of the wireless charging path.

[0013] For example, the first MOS switch and the second MOS switch can be a first PMOS transistor Q11 and a second PMOS transistor Q12, or the second MOS switch and the second MOS can be a first NMOS transistor Q31 and a second NMOS transistor Q32 respectively.

[0014] For example, the wireless transmitter chip can be a TX chip, such as TX chip 230.

[0015] For example, the wireless charging circuit may also include a third transmitting coil, and the wireless transmitting chip may also include a third MOS switch. The connection method of the third MOS switch is similar to that of the first MOS switch, and you can refer to the relevant description of the first MOS switch.

[0016] For example, the first transmitting coil, the second transmitting coil, and the wireless transmitting chip can be disposed on the PCB circuit board of the first electronic device.

[0017] For example, the first electronic device can wirelessly charge the second and third electronic devices in turn. Accordingly, when the first MOS switch is on, the second MOS switch needs to be off. When the second MOS switch is on, the first MOS switch needs to be off.

[0018] For example, the first MOS switch and the second MOS switch can be controlled by a first controller in the wireless transmitter chip, or by a second controller in the first electronic device but outside the wireless transmitter chip.

[0019] According to the first aspect, the first MOS switch and the second MOS switch are PMOS transistors.

[0020] The wireless transmitter chip includes a first controller, which is configured to: in a first control phase, output a first control signal to the control terminal of a first MOS switch to control the first MOS switch to turn on; and in a second control phase, output a first control signal to the control terminal of a second MOS switch to control the second MOS switch to turn on.

[0021] In this way, the first controller can achieve time-sharing charging control of the second and third electronic devices by controlling the switching processes of the first and second MOS switches, thus improving the control accuracy of the one-to-two wireless charging solution. Furthermore, since the first controller is integrated within the wireless transmitter chip, the wireless transmitter chip can wirelessly utilize other controllers to achieve one-to-two wireless charging control capability.

[0022] For example, the first controller can be an MCU. The first control signal can be a low-level signal, and the first control signal has a first level value. The first level value is lower than or equal to the source voltage of the MOS switch, or the difference between the first level value and the source voltage is less than a preset voltage threshold.

[0023] For example, the first electronic device may enter the first control phase when it needs to charge the second electronic device, and enter the second control phase when it needs to charge the third electronic device. For instance, the first electronic device may alternately enter the first control phase and the second control phase.

[0024] According to the first aspect, or any implementation of the first aspect above, the first MOS switch and the second MOS switch are NMOS transistors; the wireless transmitter chip includes a first controller and a bootstrap circuit, the bootstrap circuit being used to raise the first control signal output by the first controller from a first level value to a second level value; the first controller is used to: in a first control phase, output a first control signal of the second level value to the control terminal of the first MOS switch to control the first MOS switch to turn on; and in a second control phase, output a first control signal of the second level value to the control terminal of the second MOS switch to control the second MOS switch to turn on.

[0025] In this way, the drive voltage required by the NMOS transistor can be generated through the bootstrap circuit. Due to the smaller size of the NMOS transistor compared to the PMOS transistor, the area of ​​the PCB board can be further saved.

[0026] For example, the first controller may be an MCU inside the wireless transmitter chip. Optionally, the MCU may control the inverter circuit.

[0027] For example, the bootstrap circuit can be an existing circuit of the wireless transmitter chip, such as a bootstrap circuit used to generate the control voltage of the MOS transistor in the inverter circuit, without limitation. For example, the bootstrap circuit can be a bootstrap capacitor, etc., without limitation. In one example, if a 5V voltage (first level value) is applied to the first connection terminal of the NMOS transistor, the bootstrap circuit can raise it to 10V, thereby controlling the NMOS transistor to conduct.

[0028] According to the first aspect, or any implementation of the first aspect above, the wireless charging circuit further includes a second controller, the second controller being configured to acquire a first detection signal sent by a first detection sensor and acquire a second detection signal sent by a second detection sensor; and, in response to the first detection signal and the second detection signal, when it is determined that a first MOS switch is turned on, to send a notification signal to the first controller, the notification signal being configured to notify the first controller to turn on the first MOS switch; and, when it is determined that a second MOS switch is turned on, to send a notification signal to the first controller, the notification signal being configured to notify the first controller to turn on the second MOS switch; wherein the first detection signal indicates that a second electronic device is placed at a first preset position of the first electronic device, and the second detection signal indicates that a third electronic device is placed at a second preset position of the first electronic device.

[0029] In this way, a step can be added to the charging process to notify the first controller, thereby enabling accurate control of the wireless charging process through communication and interaction between the first and second controllers.

[0030] For example, the second controller can be an access point (AP). The AP controller can control the wireless charging process, such as determining the gating strategy.

[0031] According to the first aspect, or any implementation thereof, the wireless transmitting chip includes: a first output port, which is connected to one end of a first transmitting coil and one end of a second transmitting coil, wherein the first output port is connected to a first output terminal of a processing circuit, and a second output terminal of the processing circuit is connected to a first connection terminal of a first MOS switch and a first connection terminal of a second MOS switch; a second output port, which is connected to the other end of the first transmitting coil, wherein the second output port is connected to a second connection terminal of the first MOS switch; and a third output port, which is connected to the other end of the second transmitting coil, wherein the third output port is connected to a second connection terminal of the second MOS switch.

[0032] In this way, the wireless transmitter chip can control two wireless charging circuits through three output ports, improving control accuracy and ease of use.

[0033] For example, the first output port to the third output port can be the first output port AC1 to the third output port AC3, where the first output port AC1 is a common connection terminal, and the second output port AC2 and the third output port AC3 are non-common terminals.

[0034] According to the first aspect, or any implementation of the first aspect above, the wireless charging circuit further includes a second controller, the second controller being configured to: in a first control phase, output a first control signal to the control terminal of the first MOS switch to control the first MOS switch to turn on; and in a second control phase, output a first control signal to the control terminal of the second MOS switch to control the second MOS switch to turn on.

[0035] In this way, the entire charging process can be controlled as a whole through the second controller, which improves the convenience and accuracy of control.

[0036] According to the first aspect, or any implementation of the first aspect above, the wireless transmitting chip further includes: a first control port, the first control port being connected to a first output terminal of the second controller, wherein the first control port is connected to the control terminal of the first MOS switch; and a second control port, the second control port being connected to a second output terminal of the second controller, wherein the second control port is connected to the control terminal of the second MOS switch.

[0037] In this way, through the first control port and the second control port, the second controller located outside the wireless transmitter chip can control the MOS switch inside the wireless transmitter chip, thereby enabling the wireless transmitter chip and the external controller to work together to achieve one-to-two or one-to-many wireless charging control functions.

[0038] For example, the second controller may be an existing controller in the first electronic device.

[0039] According to the first aspect, or any implementation of the first aspect above, the first electronic device is used to wirelessly charge the second electronic device and the third electronic device with a first power, wherein the first power is less than a preset power threshold.

[0040] Thus, due to the high charging power of high-power charging electronic devices, the switching transistors may overheat due to the high charging power, affecting the device's safety and lifespan. In high-power charging electronic devices, the heat generated by MOSFETs is often lower due to the lower impedance of larger MOSFETs. Therefore, larger switching transistors are used in high-power charging electronic devices to reduce the heat generated by the MOSFETs by lowering their impedance. However, larger MOSFETs cannot be integrated inside the TX chip, so the MOSFETs in high-power charging electronic devices need to be placed on the PCB circuit board, occupying a large area of ​​the circuit board. In the embodiments of this application, devices such as tablet computers are low-power charging devices. Due to the lower charging power, the heat generated by the MOSFETs is less significant. Therefore, the impedance requirements of the MOSFETs are not high. Thus, in low-power charging devices, smaller MOSFETs can be integrated inside the TX chip, reducing the PCB circuit board area while ensuring the heat dissipation safety of the electronic device.

[0041] For example, the preset power threshold is the charging power of high-power charging devices such as mobile phones and wireless charging docks.

[0042] According to the first aspect, or any implementation of the first aspect above, the value range of the first power is [1W, 5W].

[0043] In this way, the solution provided in the embodiments of this application can be applied to low-power wireless charging devices.

[0044] According to the first aspect, or any implementation of the first aspect above, the second electronic device and the third electronic device are accessories to the first electronic device.

[0045] In this way, the first electronic device can wirelessly charge multiple accessories without requiring separate chargers for each accessory, or the need to charge one accessory fully before switching to another. By placing multiple accessories corresponding to the first electronic device, the device can actively charge all accessories, thus improving charging convenience.

[0046] According to the first aspect, or any implementation of the first aspect above, when the first electronic device includes a tablet computer, the second electronic device is an electronic stylus, and the third electronic device is a wireless keyboard.

[0047] This improves the ease of use and charging of tablets. Furthermore, the smaller batteries in styluses and wireless keyboards allow for the integration of MOSFETs into the wireless transmitter chip, reducing PCB area while maintaining charging safety and enhancing the user experience. Additionally, it further improves the thinness and lightness of tablets, aligning with the development and improvement trends of tablets.

[0048] In the case where the first electronic device includes an earphone case, the second electronic device is the left earphone, and the third electronic device is the right earphone.

[0049] This improves the convenience of charging wireless earbuds and enhances the user experience. Furthermore, it allows for further improvements in the size of wireless earbuds, aligning with the current development and improvement trends in the field.

[0050] Secondly, embodiments of this application provide a wireless charging circuit applied to a first electronic device. The wireless charging circuit includes: a first transmitting coil; a second transmitting coil; a first MOS switch connected to the first transmitting coil; a second MOS switch connected to the second transmitting coil, wherein the first and second MOS switches are NMOS transistors; and a wireless transmitting chip. The wireless transmitting chip includes a processing circuit, a bootstrap circuit, and a first controller. The processing circuit is used to acquire the battery voltage of the first electronic device and generate an AC voltage based on the battery voltage. The processing circuit is connected to the first transmitting coil via the first MOS switch and to the second transmitting coil via the second MOS switch. The bootstrap circuit is used to raise a first control signal output by the first controller from a first level value to a second level value. The first controller is used to control the first MOS switch or the second MOS switch to turn on using the first control signal at the second level value. When the first MOS switch is on and the second MOS switch is off, the first transmitting coil wirelessly charges the second electronic device based on the AC voltage; when the second MOS switch is on and the first MOS switch is off, the second transmitting coil wirelessly charges a third electronic device based on the AC voltage.

[0051] This wireless charging circuit, through a bootstrap circuit built into the wireless transmitter chip, can boost the output voltage to the drive voltage of the NMOS transistor. Since the NMOS transistor's volume (or size, or area occupied on the wireless transmitter chip) is smaller than that of a PMOS transistor, the area of ​​the wireless transmitter chip and the PCB circuit board can be further reduced. Optionally, the bootstrap circuit can be an existing bootstrap circuit within the wireless transmitter chip, thereby further improving the integration of the wireless transmitter chip and ensuring precise control of the charging process.

[0052] The second aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects corresponding to the second aspect and any implementation thereof are similar to those corresponding to the first aspect and any implementation thereof, and will not be repeated here.

[0053] Thirdly, embodiments of this application provide a wireless transmitting chip applied to a first electronic device. The wireless transmitting chip includes: a processing circuit for acquiring the battery voltage of the first electronic device and generating an AC voltage based on the battery voltage; a first MOS switch, with a first connection terminal connected to the processing circuit and a second connection terminal connected to a first transmitting coil of the first electronic device; and a second MOS switch, with a first connection terminal connected to the processing circuit and a second connection terminal connected to a second transmitting coil of the first electronic device. When the first MOS switch is on and the second MOS switch is off, the first transmitting coil is used to wirelessly charge the second electronic device based on the AC voltage; when the second MOS switch is on and the first MOS switch is off, the second transmitting coil is used to wirelessly charge a third electronic device based on the AC voltage.

[0054] According to the third aspect, the first MOS switch and the second MOS switch are PMOS transistors; the wireless transmitter chip includes a first controller, which is configured to: in a first control phase, output a first control signal to the control terminal of the first MOS switch to control the first MOS switch to turn on; and in a second control phase, output a first control signal to the control terminal of the second MOS switch to control the second MOS switch to turn on.

[0055] According to the third aspect, or any implementation of the third aspect above, the first MOS switch and the second MOS switch are NMOS transistors; the wireless transmitter chip includes a first controller and a bootstrap circuit, the bootstrap circuit being used to raise the first control signal output by the first controller from a first level value to a second level value; the first controller is used to: in a first control phase, output a first control signal of the second level value to the control terminal of the first MOS switch to control the first MOS switch to turn on; and in a second control phase, output a first control signal of the second level value to the control terminal of the second MOS switch to control the second MOS switch to turn on.

[0056] The third aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects corresponding to the third aspect and any implementation thereof are similar to those corresponding to the first aspect and any implementation thereof, and will not be repeated here.

[0057] Fourthly, this application provides an electronic device, characterized in that it includes: a wireless charging circuit in the first aspect or any possible implementation of the first aspect, or a wireless charging circuit in the second aspect or any possible implementation of the second aspect.

[0058] The fourth aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the fourth aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here.

[0059] Fifthly, this application provides a wireless charging system, comprising: a first electronic device, which includes a wireless charging circuit as described in the first aspect or any possible implementation of the first aspect, or a wireless charging circuit as described in the second aspect or any possible implementation of the second aspect; a second electronic device, which includes a first receiving coil, a first charging control circuit, and a first battery; the first receiving coil is correspondingly disposed with a first transmitting coil, the first receiving coil being used to receive a first magnetic field signal transmitted by the first transmitting coil, and to generate a first alternating current based on the first magnetic field signal; the first charging control circuit being used to charge the first battery based on the first alternating current; and a third electronic device, which includes a second receiving coil, a second charging control circuit, and a second battery; the second receiving coil is correspondingly disposed with a second transmitting coil, the second receiving coil being used to receive a second magnetic field signal transmitted by the second transmitting coil, and to generate a second alternating current based on the second magnetic field signal; the second charging control circuit being used to charge the second battery based on the second alternating current.

[0060] According to the fifth aspect, the second electronic device and the third electronic device are accessories to the first electronic device; wherein, when the first electronic device includes a tablet computer, the second electronic device is an electronic stylus and the third electronic device is a wireless keyboard; and when the first electronic device includes an earphone case, the second electronic device is a left earphone and the third electronic device is a right earphone.

[0061] The fifth aspect and any implementation thereof correspond to the first aspect and any implementation thereof, respectively. The technical effects of the fifth aspect and any implementation thereof are similar to those of the first aspect and any implementation thereof, and will not be repeated here. Attached Figure Description

[0062] Figure 1 A schematic diagram of a tablet computer accessory system is shown;

[0063] Figure 2 A schematic diagram illustrating the use of a tablet computer with a wireless accessory is shown.

[0064] Figure 3 A top view of the wireless keyboard after it has been snapped shut is shown;

[0065] Figure 4 This illustration shows a schematic diagram of a tablet computer accessory system before the wireless keyboard is attached, according to an embodiment of this application.

[0066] Figure 5 This illustration shows a schematic diagram of a tablet computer accessory system before the electronic stylus is attached, according to an embodiment of this application.

[0067] Figure 6 This paper shows a schematic diagram of the structure of an earphone assembly provided in an embodiment of this application;

[0068] Figure 7 A system architecture diagram of a wireless charging system is shown.

[0069] Figure 8 This paper illustrates a system architecture diagram of a wireless charging system provided in an embodiment of this application.

[0070] Figure 9 This illustration shows a structural schematic diagram of a tablet computer provided in an embodiment of this application;

[0071] Figure 10 A schematic diagram of an exemplary inverter circuit provided in an embodiment of this application is shown;

[0072] Figure 11 A schematic diagram of a wireless charging process provided in an embodiment of this application is shown;

[0073] Figure 12 This paper illustrates a system architecture diagram of another wireless charging system provided in an embodiment of this application;

[0074] Figure 13 This paper shows a schematic diagram of a bootstrap circuit provided in an embodiment of the present application;

[0075] Figure 14 This paper illustrates a system architecture diagram of yet another wireless charging system provided in an embodiment of this application.

[0076] Figure 15 This paper illustrates a system architecture diagram of another wireless charging system provided in an embodiment of this application.

[0077] Figure 16 This paper illustrates a system architecture diagram of a multi-device wireless charging system provided in an embodiment of this application.

[0078] Figure 17 A flowchart illustrating a wireless charging control method provided in an embodiment of this application is shown.

[0079] Figure 18 A flowchart illustrating another wireless charging control method provided in an embodiment of this application is shown;

[0080] Figure 19 A schematic block diagram of an apparatus according to an embodiment of this application is shown. Detailed Implementation

[0081] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0082] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0083] The terms "first" and "second," etc., used in the specification and claims of this application are used to distinguish different objects, not to describe a specific order of objects. For example, "first target object" and "second target object," etc., are used to distinguish different target objects, not to describe a specific order of target objects.

[0084] In the embodiments of this application, directional terms such as "up," "down," "left," and "right" may include, but are not limited to, the orientation relative to the schematic placement of the components in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly based on the orientation of the components in the accompanying drawings.

[0085] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or a connection through an intermediate medium. Furthermore, the term "coupled" can refer to an electrical connection method for achieving signal transmission.

[0086] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0087] In the description of the embodiments in this application, unless otherwise stated, "multiple" means two or more. For example, multiple processing units means two or more processing units; multiple systems means two or more systems.

[0088] Furthermore, in the embodiments of this application, the control terminal of each transistor is the gate of the transistor, the first connection terminal is one of the source and drain of the transistor, and the second connection terminal is the other of the source and drain of the transistor. Since the source and drain of the transistor can be symmetrical in structure, their source and drain can be structurally indistinguishable.

[0089] To facilitate the use of electronic devices, these devices often come with accessories. For example, to enable diverse input methods for tablets, they can be equipped with wireless accessories such as wireless keyboards and styluses. To improve user convenience and charging, tablets and other electronic devices are often used to charge these wireless accessories.

[0090] For example, Figure 1 A schematic diagram of a tablet computer accessory system is shown. Figure 1 As shown, the tablet computer's supporting system may include a tablet computer 10, a wireless keyboard 20, and an electronic stylus 30.

[0091] The wireless keyboard 20 includes a keyboard body 21, a tablet stand 22, and a connecting part 23. The tablet stand 22 is used to hold a tablet computer 10. When the tablet computer 10 is in use, the keyboard body 21 and the tablet stand form a certain angle. The connecting part 23 connects the keyboard body 21 and the tablet stand 22. The connecting part 23 can be made of a flexible material or a hinge. The connecting part 23 has a storage cavity 231 with an opening 232 at one end. The storage cavity 231 is used to store an electronic stylus 30.

[0092] Figure 2 A schematic diagram illustrating the use of a tablet computer with a wireless accessory is shown. (For example...) Figure 2 As shown, the keyboard body 21 and the tablet stand 22 can rotate relative to each other around the connecting part in direction ①. Furthermore, the electronic stylus 30 can be retracted into the storage cavity 231 through the opening 232 in direction ②.

[0093] In this embodiment, the tablet computer 10 can wirelessly charge the wireless keyboard 20 and the electronic stylus 30, which is a "one-to-many" wireless charging solution. The structure of this wireless charging solution will be described below through two embodiments.

[0094] In one embodiment, Figure 3 A top view of the wireless keyboard after it has been snapped shut is shown. Figure 3 As shown, the first wireless receiving coil (not shown) of the wireless keyboard 20 can be disposed within the keyboard body 21, so that when the keyboard body 21 is fastened to the tablet stand 22, a wireless charging signal is sent to the wireless keyboard 20 via the first wireless transmitting coil (not shown) of the tablet computer 10 to charge the wireless keyboard. Furthermore, the second wireless transmitting coil of the tablet computer 20 can be disposed on the side near the storage cavity 231, so that the tablet computer 10 can wirelessly charge the stylus 30 after it is retracted into the storage cavity 231.

[0095] In another implementation, Figure 4 This illustration shows a schematic diagram of a tablet computer accessory system before the wireless keyboard is magnetically attached, according to an embodiment of this application. Figure 4 As shown, a first wireless receiving coil 221 is provided inside the tablet stand 22 of the wireless keyboard 20, and a first wireless transmitting coil 11 is provided inside the tablet computer 10. The first wireless transmitting coil 11 and the first wireless receiving coil 221 are correspondingly arranged. When the tablet computer 10 is placed on the tablet stand 22, the first wireless transmitting coil 11 and the first wireless receiving coil 221 are coupled. The tablet computer 10 transmits a wireless charging signal to the wireless keyboard 20 through the coupled first wireless transmitting coil 11 and the first wireless receiving coil 221 to wirelessly charge the wireless keyboard 20.

[0096] as well as, Figure 5 This illustration shows a schematic diagram of a tablet computer accessory system before the electronic stylus is attached, according to an embodiment of this application. Figure 5 As shown, the tablet computer 10 has a second wireless transmitting coil 12, and the electronic stylus 30 has a second wireless receiving coil 31. The second wireless transmitting coil 12 and the second wireless receiving coil 31 are correspondingly arranged. When the electronic stylus 30 is magnetically attached to the side of the tablet computer 10 where the second wireless transmitting coil 12 is located, the second wireless transmitting coil 12 and the second wireless receiving coil 31 are coupled. The tablet computer 10 then sends a wireless charging signal to the electronic stylus 30 through the coupled second wireless transmitting coil 12 and the second wireless receiving coil 31 to charge the electronic stylus 30.

[0097] It should be noted that the above embodiments only show feasible wireless charging solutions. In actual applications, other feasible wireless charging methods can also be used to enable the tablet computer 10 to wirelessly charge the wireless keyboard 20 and the electronic stylus 30. This application embodiment does not limit this.

[0098] Furthermore, it is understood that the above description only schematically illustrates some of the components included in the tablet computer 10, wireless keyboard 20, and electronic stylus 30. In reality, the tablet computer 10, wireless keyboard 20, and electronic stylus 30 may have more or fewer components than described above, or combine some components, or separate some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0099] For example, Figure 6 A schematic diagram of the structure of an earphone assembly provided in an embodiment of this application is shown. Figure 6 As shown, the headphone assembly 40 may include a headphone case 41, a left earbud 42, and a right earbud 43.

[0100] The earphone case 41 includes an earphone storage slot 411, a third wireless transmitting coil 412, and a fourth wireless transmitting coil 413. A third wireless receiving coil 421 is disposed inside the left earbud 42, corresponding to the third wireless transmitting coil 412. A fourth wireless receiving coil 431 is disposed inside the right earbud 43, corresponding to the fourth wireless transmitting coil 413.

[0101] When the left earbud 42 and the right earbud 43 are placed in the earphone storage slot 411, the third wireless receiving coil 421 is coupled to the third wireless transmitting coil 412, and the fourth wireless receiving coil 431 is coupled to the fourth wireless transmitting coil 413. The earphone case 41 sends a wireless charging signal to the left earbud 42 through the coupled third wireless receiving coil 421 and the third wireless transmitting coil 412, and sends a wireless charging signal to the right earbud 43 through the coupled fourth wireless receiving coil 431 and the fourth wireless transmitting coil 413, so as to wirelessly charge the left earbud 42 and the right earbud 43.

[0102] Having illustrated the scenario of wireless charging of accessories by electronic devices through the above examples, the circuit structure of the wireless charging system will now be explained.

[0103] Figure 7 A system architecture diagram of a wireless charging system is shown. Figure 7 As shown, the wireless charging system 100 may include an electronic device 110 and an accessory 120. The electronic device 110 may include a device battery 111 (i.e., the battery of the electronic device), a direct current converter (DCDC) circuit 112, a power transmission (TX) chip 113, a resonant capacitor C1, and a resonant transmitting coil L1.

[0104] Accessory 120 may include accessory battery 121, charging chip 122, power receiving (RX) chip 123, and receiving coil L2.

[0105] During wireless charging, battery 111 outputs a first DC power to DC-DC circuit 112, and after voltage conversion by DC-DC circuit 112, a second DC power is obtained. DC-DC circuit 112 provides the second DC power to TX chip 113, and TX chip 113 converts the second DC power into a first AC power and provides it to transmitting coil L1. Transmitting coil L1 generates an alternating electromagnetic field in response to the first AC power.

[0106] Furthermore, the receiving coil L2 generates a second alternating current after sensing the alternating electromagnetic field, and provides the second alternating current to the RX chip 123. The RX chip 123 converts the second alternating current into a third direct current and provides the third direct current to the charging chip 122. The charging chip 122 uses the third direct current to charge the battery 121.

[0107] The inventors discovered through research that if a separate charging circuit is set up for the electronic stylus and wireless keyboard in electronic devices (i.e., a one-to-one wireless charging solution), the charging circuits will be relatively scattered and have low integration.

[0108] Furthermore, the inventors discovered through research that electronic devices such as the aforementioned tablet computer 10 and earphone case 41, taking the tablet computer 10 as an example, typically have a charging power of only around 1W when charging accessories such as the wireless keyboard 20 and electronic stylus 30. Correspondingly, these electronic devices can wirelessly charge accessories at low power, such as within the range of 1-5W. It should also be noted that charging docks (such as vertical charging docks) often have a charging power of 50W or 80W. This means that for high-power charging electronic devices such as mobile phones, laptops, and charging docks, the charging power is much higher, potentially reaching hundreds of watts (e.g., up to 500W). In other words, the charging power of electronic devices such as the tablet computer 10 in this application embodiment for accessories is far lower than the charging power of high-power charging electronic devices.

[0109] Furthermore, taking tablet computers as an example, they are constantly evolving towards thinner and lighter designs. Therefore, how to improve the thinner and lighter design of tablet computers and other devices has become an urgent technical problem to be solved.

[0110] Based on the above, this application provides a one-to-many wireless charging solution, meaning that an electronic device can wirelessly charge multiple accessories. It should be noted that this application is applicable to electronic devices that wirelessly charge accessories at low power, such as tablets and headphone cases. The low power range can be 1~5W, for example, 1W, 1.25W, 1.5W, 1.75W, 2W, 2.25W, 2.5W, 2.75W, 3W, 3.25W, 3.5W, 3.75W, 4W, 4.25W, 4.5W, 4.75W, and 5W. Furthermore, the electronic device in this application can be an electronic device designed for thinner and lighter designs.

[0111] For clarity, the wireless charging solution described below will be illustrated using a tablet computer 200 as the electronic device and multiple accessories including an electronic stylus 300 and a wireless keyboard 400 as an example. The tablet computer 200 can be implemented as described above. Figures 1-5 The tablet computer 10 and the electronic stylus 300 can achieve the above-mentioned functionality. Figures 1-5 The electronic stylus 30 and wireless keyboard 400 mentioned above can achieve the above-mentioned functionality. Figures 1-5 Wireless keyboard 20.

[0112] Figure 8 A system architecture diagram of a wireless charging system provided in an embodiment of this application is shown. Figure 8 As shown, the wireless charging system may include a tablet computer 200, an electronic stylus 300, and a wireless keyboard 400. In this embodiment, the tablet computer 200 wirelessly charges the accessories at low power.

[0113] The tablet computer 200 may include a tablet battery 210, a DC-DC circuit 220, a TX chip 230 (i.e., a wireless transmitting chip), a first capacitor C11, a second capacitor C12, a first transmitting coil L11, and a second transmitting coil L12. For example, the tablet battery 210, DC-DC circuit 220, TX chip 230, first capacitor C11, second capacitor C12, first transmitting coil L11, and second transmitting coil L12, etc., can all be disposed on the printed circuit board (PCB) of the tablet computer 200. It should also be noted that the aforementioned TX chip 230, first capacitor C11, second capacitor C12, first transmitting coil L11, and second transmitting coil L12 may belong to the wireless charging circuit of the tablet computer 200.

[0114] Regarding the connection relationships of the above functional devices, as follows: Figure 8 As shown, the output terminal of the flat battery 210 is connected to one end of the DC-DC circuit 220, and the other end of the DC-DC circuit 220 is connected to the input terminal of the TX chip 230. The first output port AC1 of the TX chip 230 is connected to one end of the first capacitor C11 and one end of the second capacitor C12. The other end of the first capacitor C11 is connected to one end of the first transmitting coil L11, and the other end of the first transmitting coil L11 is connected to the second output port AC2 of the TX chip 230. The other end of the second capacitor C12 is connected to one end of the second transmitting coil L12, and the other end of the second transmitting coil L12 is connected to the second output port AC2 of the TX chip 230. The first output port AC1 is a common connection terminal, while the second output port AC2 and the third output port AC3 are non-common terminals.

[0115] Among them, the tablet battery 210 can be the battery of the tablet computer 200, used to power the various components in the tablet computer 200, and can also provide power to the external accessories of the electronic device.

[0116] Furthermore, the DC-DC circuit 220 can be implemented as a boost converter. For example, Figure 9 A schematic diagram of the structure of an exemplary tablet computer provided in an embodiment of this application is shown. Figure 9As shown, the DC-DC circuit 220 can be implemented as a BOOST converter 221. The BOOST converter 221 can be implemented as a BOOST circuit or a BOOST chip, etc., without specific limitations. Furthermore, it is understood that in practice, the DC-DC circuit 220 can also be configured as a buck converter, a buck-boost converter, or other circuits or functional devices that regulate voltage through boosting and / or bucking, without specific limitations.

[0117] Furthermore, the first capacitor C11 and the first transmitting coil L11 can belong to the first resonant circuit (or wireless charging path 1), and the second capacitor C12 and the second transmitting coil L12 can belong to the second resonant circuit (or wireless charging path 2). The first capacitor C11 compensates for the AC current in the first resonant circuit, and the second capacitor C12 compensates for the AC current in the second resonant circuit. It should be noted that in the embodiments of this application, other devices with AC current compensation functions, such as compensation inductors, can also be provided on the first and second resonant circuits, without specific limitations.

[0118] Furthermore, the TX chip 230 can be used to convert direct current to alternating current. See also, in some embodiments, [further details omitted]. Figure 9 The TX chip 230 may include an inverter circuit 231 (i.e., a processing circuit), a microcontroller (MCU) 232, a first PMOS transistor Q11 (i.e., a first MOS switch) and a second PMOS transistor Q12 (i.e., a second MOS switch).

[0119] The inverter circuit 231 is used to convert the DC power output from the BOOST converter 221 into AC power. Specifically, as shown... Figure 9 As shown, the input terminal of the inverter circuit 231 is connected to the input terminal of the BOOST converter 221, and the first output terminal of the inverter circuit 231 is connected to the first output port AC1 of the TX chip 230. In one embodiment, the inverter circuit 231 can be implemented as a full-bridge inverter circuit. For example, Figure 10 A schematic diagram of an exemplary inverter circuit provided in an embodiment of this application is shown. Figure 10As shown, the inverter circuit 231 may include a first switch Q21, a second switch Q22, a third switch Q23, and a fourth switch Q24. The first connection terminals of the first switch Q21 and the second switch Q22 can be connected together to the first output terminal of the BOOST converter 221. The second connection terminals of the first switch Q21 and the third switch Q23 are connected together, and the second connection terminals of the second switch Q22 and the fourth switch Q24 are connected together. The second connection terminals of the third switch Q23 and the fourth switch Q24 can be connected together to the second output terminal of the BOOST converter 221. The BOOST converter 221 can output DC current Uin to the inverter through the first and second output terminals. Furthermore, there is a node A between the second connection terminals of the first switch Q21 and the first connection terminals of the third switch Q23, and node A can serve as the first output terminal of the inverter circuit 231. Furthermore, a node B is located between the second connection terminal of the second switch Q22 and the first connection terminal of the fourth switch Q24, and node B can serve as the second output terminal of the inverter circuit 231. By controlling the on / off state of the first switch Q21 to the fourth switch Q24, the inverter circuit 231 can convert direct current into alternating current. It should be noted that, in the embodiments of this application, the inverter circuit 231 can also be implemented as other circuits or devices with DC-AC conversion functions, and no specific limitations are imposed on this.

[0120] Furthermore, the MCU232 can serve as the internal controller of the TX chip 230, enabling it to control the on / off state of the MOSFETs within the TX chip. See also... Figure 10 The MCU232 has a first control terminal and a second control terminal. The first control terminal can be connected to the control terminal of the first PMOS transistor Q11, and the second control terminal can be connected to the control terminal of the second PMOS transistor Q12 to control the first PMOS transistor Q11 and the second PMOS transistor Q12 to be turned on or off. In this embodiment, when either the first PMOS transistor Q11 or the second PMOS transistor Q12 is in the on state, the other PMOS transistor Q11 or the second PMOS transistor Q12 is in the off state. Furthermore, in this embodiment, the MCU232 is the original controller in the TX chip, for example, it can control the inverter circuit 231. It should be noted that in this embodiment, the MCU232 can also be implemented as other controllers with control functions, and no specific limitations are imposed.

[0121] Furthermore, the first PMOS transistor Q11 can be used to control whether the first transmitting coil L11 operates. When the first PMOS transistor Q11 is turned on, the first transmitting coil L11 can convert the alternating current output from the inverter circuit into an alternating magnetic field, thereby transferring electrical energy to the first receiving coil L21 of the electronic stylus 300 in the form of an alternating magnetic field to charge the electronic stylus. Conversely, when the first PMOS transistor Q11 is turned off, the first transmitting coil L11 cannot generate an alternating magnetic field. For details, please refer to [link to documentation]. Figure 9 The first terminal of the first PMOS transistor Q11 can be connected to the second output terminal of the inverter circuit 231, and the second terminal of the first PMOS transistor Q11 can be connected to the second output port AC2 of the TX chip, so as to connect to the other end of the first transmitting coil L11 through the second output port AC2.

[0122] Furthermore, the second PMOS transistor Q12 can be used to control whether the second transmitting coil L12 operates. The specific control method is similar to the control of the first transmitting coil L11 by the first PMOS transistor Q11, and will not be repeated here. For details, please refer to [link to relevant documentation]. Figure 9 The first connection terminal of the second PMOS transistor Q12 can be connected to the second output terminal of the inverter circuit 231, and the second connection terminal of the second PMOS transistor Q12 can be connected to the third output port AC3 of the TX chip, so as to connect to the other end of the second transmitting coil L12 through the third output port AC3.

[0123] After introducing the specific structure of the tablet computer 200, we will now continue to explain the specific structure of the electronic stylus 300.

[0124] The electronic stylus 300 may include a first receiving coil L21, a stylus RX chip 310 (i.e., the stylus's RX chip, used to convert the alternating current induced by the first receiving coil L21 into direct current), a stylus charging chip 320 (i.e., the stylus's charging chip, used to charge the stylus battery 330), and a stylus battery 330 (i.e., the stylus's battery, used to power the internal components of the electronic stylus). The first receiving coil L21 is correspondingly configured with a first transmitting coil L11. One end of the first receiving coil L21 is connected to the first input port of the stylus RX chip 310, and the other end of the first receiving coil L21 is connected to the second input port of the stylus RX chip 310. The output terminal of the stylus RX chip 310 is connected to the input terminal of the stylus charging chip 320, and the output terminal of the stylus charging chip 320 is connected to the stylus battery 330. The stylus battery 330, also known as the battery of the electronic stylus 300, is used to power the various components of the electronic stylus 300 and can also receive and store electrical energy input from the outside of the electronic stylus 300.

[0125] After describing the electronic stylus 300, we will now proceed to explain the wireless keyboard 400.

[0126] The wireless keyboard 400 may include a second receiving coil L22, a keyboard RX chip 410 (i.e., the RX chip of the wireless keyboard, used to convert the AC power induced by the second receiving coil L22 into DC power), a keyboard charging chip 420 (i.e., the charging chip of the wireless keyboard, used to charge the wireless keyboard battery 430), and a keyboard battery 430 (i.e., the battery of the wireless keyboard, used to power the internal components of the wireless keyboard). The second receiving coil L22 is correspondingly configured with the second transmitting coil L12. One end of the second receiving coil L22 is connected to the first input port of the keyboard RX chip 410, and the other end of the second receiving coil L22 is connected to the second input port of the keyboard RX chip 410. The output terminal of the keyboard RX chip 410 is connected to the input terminal of the keyboard charging chip 420, and the output terminal of the keyboard charging chip 420 is connected to the keyboard battery 430. The keyboard battery 430, i.e., the battery of the wireless keyboard 400, is used to power the various components of the wireless keyboard 400, and can also receive and store electrical energy input from external sources.

[0127] After describing the structure of the tablet computer 200, the electronic stylus 300, and the wireless keyboard 400, the wireless charging process of the wireless charging system will be described next.

[0128] In this embodiment, both the electronic stylus 300 and the wireless keyboard 400 are magnetically attached to the tablet computer 200 (e.g., both are placed in a preset charging position or area, for example, the electronic stylus 300 is retracted into the tablet computer). Figure 3 The storage cavity 231 shown is in which the tablet computer 200 is placed. Figure 4 After the tablet stand 22 shown, the first transmitting coil L11 is coupled to the first receiving coil L21, and the second transmitting coil L12 is coupled to the second receiving coil L22. At this time, the tablet 200 can perform a "one-to-two" charging process for the electronic stylus 300 and the wireless keyboard 400.

[0129] In a one-to-two wireless charging process, the tablet 200 can charge the stylus 300 and the wireless keyboard 400 in a time-sharing manner. For example, Figure 11 A schematic diagram of a wireless charging process provided in an embodiment of this application is shown. Figure 11As shown, in the first time period t1, the tablet computer 200 performs the first round of wireless charging for the stylus 300; in the second time period t2, the tablet computer 200 performs the first round of wireless charging for the wireless keyboard 400; in the third time period t3, the tablet computer 200 performs the second round of wireless charging for the stylus 300; and in the fourth time period t4, the tablet computer 200 performs the second round of wireless charging for the wireless keyboard 400; ...; the tablet computer 200 charges the stylus 300 and the wireless keyboard 400 alternately until charging is complete. It should be noted that the lengths of the above time periods can be the same or different, and can be determined by the AP based on the specific charging situation; there are no specific restrictions on this.

[0130] Specifically, during the charging process of the tablet computer 200 to the electronic stylus 300 (such as the first time period t1 and the third time period t3 mentioned above), the MCU 232 provides a first level to the first PMOS transistor Q11, turning on the first PMOS transistor Q11 and turning off the second PMOS transistor Q12. The first level can be a low level, such as 0V, as described in this embodiment, to ensure the turn-on voltage V... GS (That is, the voltage between the gate and the source) is less than 0 and less than a negative value of a preset voltage threshold. Furthermore, after the first PMOS transistor Q11 is turned on, the first transmitting coil L11 can convert the AC power provided by the inverter circuit 231 into an alternating magnetic field. The first receiving coil L21 of the electronic stylus 300 senses this alternating magnetic field and generates AC power. The stylus RX chip 310 can convert the AC power induced by the first receiving coil L21 into DC power, and the stylus charging chip 320 uses the converted DC power to charge the stylus battery 330.

[0131] Furthermore, during the charging process of the tablet computer 200 to the wireless keyboard 400 (e.g., the second time period t2 and the fourth time period t4 mentioned above), the MCU 232 provides a first level to the second PMOS transistor Q12, turning on the second PMOS transistor Q12 and turning off the first PMOS transistor Q11. After the second PMOS transistor Q12 turns on, the second transmitting coil L12 can convert the AC power provided by the inverter circuit 231 into an alternating magnetic field. The second receiving coil L22 of the wireless keyboard 400 senses this alternating magnetic field and generates AC power. The keyboard RX chip 410 can convert the AC power induced by the second receiving coil L22 into DC power, and the keyboard charging chip 420 uses the converted DC power to charge the keyboard battery 430.

[0132] In the circuit provided in this application embodiment, the TX chip 230 can achieve dual charging of the electronic stylus and wireless keyboard. Compared with the single-to-one charging solution, the technical solution provided in this application embodiment improves the integration of the wireless charging circuit in the tablet computer. It should be noted that the solution in this application embodiment can also be applied to other low-power electronic devices besides tablet computers, and no specific limitations are imposed. Furthermore, the electronic device can also wirelessly charge two or more accessories with low power consumption, other than the electronic stylus and wireless keyboard, in a dual-to-multiple manner.

[0133] Furthermore, since the first PMOS transistor Q11 and the second PMOS transistor Q12 are integrated inside the TX chip, there is no need to set discrete MOS transistors outside the TX chip, simplifying the peripheral circuit design and saving PCB board area. Also, the integration density of the circuitry inside the TX chip (such as the aforementioned PMOS transistors) is higher than that of the circuitry on the PCB board, thereby reducing the PCB board area and saving costs. Finally, as tablet computers are trending towards thinner and lighter designs, reducing the PCB area further enhances the thinness and lightness of the tablet computer.

[0134] Furthermore, compared to high-power charging electronic devices, the higher charging power of these devices can lead to overheating of the switching transistors, affecting device safety and lifespan. In high-power charging electronic devices, larger MOSFETs often have lower impedance, thus reducing overheating by lowering their impedance. However, larger MOSFETs cannot be integrated into the TX chip, requiring them to be placed on the PCB, occupying a significant area. In this application, the inventors discovered that devices such as tablets are low-power charging devices. Due to the lower charging power, the overheating of MOSFETs is less noticeable, and impedance requirements are lower. Therefore, smaller MOSFETs can be integrated into the TX chip in low-power charging devices, reducing PCB area while ensuring the thermal safety of the electronic device.

[0135] This application also provides another wireless charging system. Figure 12 A system architecture diagram of another wireless charging system provided in an embodiment of this application is shown. It should be noted that... Figure 12 and Figure 8 The electronic stylus 300 and wireless keyboard 400 have the same structure. Figure 12 Only the structure of the tablet computer 200 is shown in the text.

[0136] Figure 12 The tablet computer 200 shown is... Figure 8 The difference shown in the tablet computer 200 is that, Figure 12 The TX chip 230 also includes a bootstrap circuit 233, a first NMOS transistor Q31, and a second NMOS transistor Q32.

[0137] The bootstrap circuit 233 is used to increase the drive voltage of the NMOS transistor. In some embodiments, to further reduce the PCB board area, the bootstrap circuit 233 can be an existing bootstrap circuit in the TX chip, such as the bootstrap circuit in the inverter bridge 231. Alternatively, the bootstrap circuit 233 can be a newly added circuit. Exemplarily, the bootstrap circuit in this embodiment can implement a bootstrap capacitor. Exemplarily, Figure 13 A schematic diagram of a bootstrap circuit provided in an embodiment of this application is shown. Figure 13 As shown, the bootstrap circuit 233 may include a bootstrap capacitor Ca. Taking the first NMOS transistor Q31 as an example, one end a1 of the bootstrap capacitor Ca is connected to the first connection terminal of the first NMOS transistor Q31, and the other end a2 of the bootstrap capacitor Ca is connected to the control terminal of the second NMOS transistor Q31. According to the characteristics of the bootstrap capacitor, when a voltage Va is applied to the first connection terminal of the first NMOS transistor Q31, the voltage at one end a1 of the bootstrap capacitor Ca increases, thereby increasing the voltage at the other end a2 of the bootstrap capacitor Ca, thus enabling the first NMOS transistor Q31 to conduct. For example, if the voltage at the first connection terminal (assumed to be the source) of the first NMOS transistor Q31 is 5V, the bootstrap circuit 232 can increase the voltage at the control terminal of the first NMOS transistor Q31 to 10V, and the conduction voltage Va... GS When the voltage between the gate and the source reaches 5V (greater than the preset voltage threshold), the first NMOS transistor Q31 is turned on.

[0138] It should be noted that the connection method between the bootstrap capacitor Ca and the second NMOS transistor Q32, as well as the control method of the second NMOS transistor Q32, are similar to those of the first NMOS transistor Q31. Please refer to the relevant descriptions above; they will not be repeated here. Furthermore, it should be noted that the bootstrap circuit 233 can also be implemented as other circuits capable of increasing the NMOS transistor drive voltage, such as a combination circuit of a bootstrap capacitor and a bootstrap resistor, etc., without specific limitations.

[0139] The connection relationship and control method of the first NMOS transistor Q31 and the second NMOS transistor Q32 can be found in the above description of the first PMOS transistor Q11 and the second PMOS transistor Q12 in the embodiments of this application, and no specific limitations are made thereto.

[0140] Since the MCU232 itself cannot provide the drive voltage for the NMOS transistor, in this embodiment, a bootstrap circuit built into the TX chip can be used to boost the voltage output by the MCU to the drive voltage of the NMOS transistor. Because the volume (or size, or area occupied on the TX chip) of the NMOS transistor is smaller than that of the PMOS transistor, the area of ​​the TX chip and the PCB circuit board can be further reduced. Optionally, the bootstrap circuit can be an existing bootstrap circuit within the TX chip, thereby further improving the integration of the TX chip and ensuring precise control of the charging process by the TX chip.

[0141] This application also provides yet another wireless charging system. Figure 14 This paper illustrates a system architecture diagram of another wireless charging system provided in an embodiment of this application.

[0142] Figure 14 and Figure 13 The difference between the tablet computer 200 and the TX chip 230 is that the TX chip 230 includes a first output port AC1 to a fourth output port AC4, and the first NMOS transistor Q31 and the second NMOS transistor Q32 are disposed outside the TX chip 230, that is, the first NMOS transistor Q31 and the second NMOS transistor Q32 are disposed on the PCB circuit board. The connection method of the first output port AC1 and the second output port AC2 is different from... Figure 8 The connection method of the two ports in the tablet computer shown is the same, so it will not be described again. The third output port AC3 is connected to the gate of the first NMOS transistor Q31, and the fourth output port AC4 is connected to the gate of the second NMOS transistor Q32.

[0143] Since the controller cannot provide the drive voltage for the NMOS transistor, a conventional solution for a one-to-two circuit setup would place a PMOS transistor on the PCB board. However, in the wireless charging system provided in this embodiment, the bootstrap circuit 233 can output the drive voltage for the NMOS transistor, thus allowing the PMOS transistor on the PCB board to be replaced with an NMOS transistor. Because the NMOS transistor is smaller than the PMOS transistor, PCB board area is saved, further improving the thinness and lightness of the tablet. Furthermore, when the bootstrap circuit is the original circuit of the TX chip, no additional circuitry is needed to control the NMOS transistor, further saving PCB board area.

[0144] This application also provides another wireless charging system. Figure 15 A system architecture diagram of another wireless charging system provided in an embodiment of this application is shown.

[0145] Figure 15 and Figure 10The difference in the tablet computer 200 shown is that the controller for the first PMOS transistor Q11 and the second PMOS transistor Q12 is replaced by an application processor (AP) 240 instead of an MCU 232. Specifically, as shown... Figure 15 As shown, the tablet computer 200 also includes an AP240, and the TX chip 230 also includes a first switch control pin P1 and a second switch control pin P2.

[0146] AP240 is used to control the on / off state of the first PMOS transistor Q11 and the second PMOS transistor Q12. When charging the electronic stylus 300, AP240 drives the first PMOS transistor Q11 to turn on and the second PMOS transistor Q12 to turn off via the first switch control pin P1. When charging the wireless keyboard 400, AP240 drives the second PMOS transistor Q12 to turn on and the first PMOS transistor Q11 to turn off via the second switch control pin P2.

[0147] It should be noted that, in the embodiments of this application, other controllers besides the AP that have control functions over the wireless charging process may also be used, and there are no specific limitations on this.

[0148] Furthermore, it should be noted that the above embodiments illustrate the technical solution of the present application embodiments using a one-to-two wireless charging solution as an example. It should be understood that the above embodiments of the present application can also realize a one-to-many (one electronic device wirelessly charges three or more accessories) wireless charging solution.

[0149] Figure 16 This diagram illustrates a system architecture diagram of a multi-device wireless charging system provided in an embodiment of this application. The following section will combine... Figure 16 ,right Figure 8 The illustrated wireless charging system will be used to describe a multi-device wireless charging system. It should be noted that the wireless charging solutions shown in other embodiments can also be implemented as multi-device wireless charging systems, and their implementation schemes are similar. Figure 16 Similarly, I will not elaborate further on this.

[0150] like Figure 16 As shown, the tablet computer 200 includes: a first output port AC1 to an Nth output port CAN, a first capacitor C11 to an Nth capacitor C1N, a first transmitting coil L11 to an Nth transmitting coil L1N, and a TX chip 230. The TX chip 230 may include a first PMOS transistor Q11 to an Nth PMOS transistor Q1N and an MCU 232. The MCU 232 includes a first control terminal to an Nth control terminal, where N is any positive integer greater than or equal to 3.

[0151] In this circuit, one end of the i-th capacitor C1i is connected to the first output port AC1, and the other end of the i-th capacitor C1i is connected to one end of the i-th transmitting coil L1i. The other end of the i-th transmitting coil L1i is connected to the second connection terminal of the i-th PMOS transistor Q1i through the i-th output port AC1. The first connection terminal of the i-th PMOS transistor Q1i is connected to the second output terminal of the inverter circuit 231, and the control terminal of the i-th PMOS transistor Q1i is connected to the i-th control terminal of the MCU 232. Here, i is any positive integer greater than or equal to 1 and less than or equal to N.

[0152] In this embodiment, the i-th capacitor C1i and the i-th transmitting coil L1i constitute a wireless charging path i. The i-th PMOS transistor Q1i is used to control whether the wireless charging path i is working. When the wireless charging path i is working, the tablet computer 200 can wirelessly charge the i-th accessory. Specifically, the MCU 232 controls one of the PMOS transistors from the first to the Nth PMOS transistor Q1N to be turned on at any time to perform time-sharing wireless charging for N accessories.

[0153] Through this embodiment, by integrating more MOSFETs, a single TX chip can integrate a one-to-N charging function, enabling the TX chip to be applied to one-to-N application scenarios for tablet computers. Optionally, for the solution provided in this application embodiment, the TX chip can be applied to various different one-to-many charging scenarios through the flexible connection of the transmitting coils. For example, when any two transmitting coils are connected, the TX chip can be applied to a one-to-two charging scenario; when N transmitting coils are connected, the TX chip can be applied to a one-to-N charging scenario.

[0154] In addition, it should be noted that, besides Figure 16 Following the MOSFET integration scheme shown, in a one-to-N charging scheme, the N MOSFETs can be turned on in turn (the specific turn-on order remains unchanged) through MOSFET multiplexing. For example, if the first output of the inverter circuit can be connected to the first output port to the M1th output port through M1 MOSFETs, and the second output of the inverter circuit can be connected to the M+1th output port to the M1+M2th output port through M2 MOSFETs, then up to M1×M2 wireless charging paths can be independently controlled through the first output port to the M1+M2th output port, meaning that time-sharing charging control can be performed on M1×M2 accessories. It should be noted that one-to-N wireless charging control can also be achieved through other MOSFET multiplexing methods within the TX chip, without specific limitations.

[0155] In some embodiments, where the aforementioned MOS transistors (first PMOS transistor Q11 and second PMOS transistor Q12, or first NMOS transistor Q31 and second NMOS transistor Q32) are disposed inside the TX chip 230, the TX chip 230 further includes a thermally conductive layer. A portion of the thermally conductive layer covers the MOS transistors, and another portion contacts a cooler region within the TX chip (i.e., a region with lower heat dissipation performance or temperature than the MOS transistors), thereby transferring heat dissipated by the MOS transistors to the cooler region through the thermally conductive layer. Exemplarily, the material of the thermally conductive layer can also be graphite or other materials with good thermal conductivity; there is no specific limitation.

[0156] It should be noted that when the aforementioned MOSFET is integrated into the TX chip, the TX chip has a higher integration density compared to the peripheral circuitry. Consequently, the size of the MOSFET is reduced due to integration. This reduction in MOSFET size can lead to increased MOSFET impedance, causing overheating and affecting the lifespan and safety of the electronic device. The aforementioned thermal conductive layer addresses this issue by saving PCB board space while ensuring the safety of the electronic device.

[0157] Having described the wireless charging solution provided by the embodiments of this application through the above examples, the wireless charging control logic of the embodiments of this application will be described next.

[0158] Figure 17 A flowchart illustrating a wireless charging control method provided in an embodiment of this application is shown. Wherein, Figure 17 The wireless charging method shown can be applied to the wireless charging system where the MOSFET is controlled by an MCU, for example, in the above-described combination Figures 8 to 16 The wireless charging system shown in any embodiment.

[0159] like Figure 17 As shown, the wireless charging method may include the following steps S1701 to S1711.

[0160] S1701, when the electronic stylus is attached (i.e., attached to or stored in the tablet computer), the first sensor detects the first detection signal.

[0161] In step S1701, a first detection signal sensor can be provided on the side of the electronic stylus, and a first detection signal transmitter can be provided at a first preset position on the tablet computer. When the electronic stylus is attached to the first preset position, the first detection signal transmitted by the first detection signal transmitter can be collected by the first detection signal sensor. At this time, the electronic stylus can transmit the detected first detection signal to the tablet computer via a communication module. After receiving the first detection signal via the communication module, the tablet computer transmits it to the AP. The first detection signal can be a sensing signal such as an electrical signal, magnetic signal, optical signal, or pressure signal. For example, the signal sensor provided on the electronic stylus can be a Hall sensor, a compass, or other sensor with magnetic signal sensing capability. A magnet or other device with magnetic signal emission capability can be provided at the first preset position on the tablet computer. The first detection signal can be a magnetic signal.

[0162] It should be noted that, in this embodiment of the application, the first detection signal sensor can also be set on the tablet computer and the first detection signal transmitter can be set on the electronic stylus, depending on the actual situation. In this case, the first detection signal sensor can send the detected first detection signal to the AP.

[0163] In this embodiment, the tablet computer can also detect whether the electronic stylus is attached to the first preset position by means of Q-value detection circuit. Specifically, the tablet computer detects the Q-value of the first transmitting coil L11. If the detected Q-value is greater than or equal to a preset Q-value threshold, it is determined that the electronic stylus is attached to the first preset position. For example, the Q-value of the first transmitting coil L11 can be calculated based on the inductance, AC impedance, and resonant frequency of the transmitting coil. This embodiment does not limit the method of Q-value detection. It should be noted that other methods can also be used to detect whether the electronic stylus is attached (or in place) in this embodiment, and no specific limitation is made.

[0164] S1702, the first detection signal sensor sends the first detection signal to the AP.

[0165] S1703, the second detection signal sensor detects the second detection signal when the wireless keyboard is attached.

[0166] In some embodiments, a second detection signal sensor can be set on the wireless keyboard, and a second detection signal transmitter can be set at a second preset position on the tablet computer. In other embodiments, a second detection signal transmitter can be set on the wireless keyboard, and a second detection signal sensor can be set at a second preset position on the tablet computer; the specific setting positions are not limited. It should be noted that the detection methods of the first detection signal and the second detection signal are similar, and can be found in the relevant description of S1701, which will not be repeated here.

[0167] S1704, the second detection signal sensor sends the second detection signal to the AP.

[0168] In step S1705, upon receiving the first and second detection signals, the AP determines a gating strategy based on various charging information (such as remaining battery power and the order of battery adsorption). This gating strategy refers to the strategy for turning the first and second MOS switches on and off at different time periods. In some embodiments, the first MOS switch can be a first PMOS transistor Q11, and the second MOS switch can be a second PMOS transistor Q12. In other embodiments, the first MOS switch can be a first NMOS transistor Q31, and the second MOS switch can be a second NMOS transistor Q32.

[0169] For example, the AP can determine the sequential turn-on order of the first MOS switch and the second MOS switch, i.e., the charging order of the stylus and the wireless keyboard. For instance, the stylus with lower remaining battery power is charged first, or the stylus that was first attached is charged first. Optionally, the selection strategy may also include the turn-on duration of the first and second MOS switches, i.e., the charging duration of the stylus and the wireless keyboard. Optionally, the selection strategy may also include control information that can affect the charging process, such as charging power, without specific limitations.

[0170] S1706, AP determines whether the first MOS switch needs to be turned on according to the gating strategy. If the determination result is yes, then jump to step S1707; if the determination result is no, then jump to step S1710.

[0171] For example, continue with Figure 11 For example, the gating strategy may include: in the first time period t1, selecting the first MOS switch to be turned on; in the second time period t2, selecting the second MOS switch to be turned on; and so on. In the first time period t1, the AP can determine that the first MOS switch needs to be turned on according to the gating strategy, and accordingly, continue to execute step S1707. And, in the second time period t2, if the AP determines that the second MOS switch needs to be turned on according to the gating strategy, then step S1710 can be adjusted.

[0172] S1707, if the AP determines that the first MOS switch needs to be turned on, it sends a notification message to the MCU. In some embodiments, the AP and the MCU can be connected via a communication bus such as I2C.

[0173] The notification information is used to instruct the MCU to control the first MOS switch to turn on and the second MOS switch to turn off. For example, the notification information may include a gating strategy, information detected by the MCU, etc.

[0174] In some embodiments, the AP can send a notification message to the MCU when the on / off state of the first MOS switch and the second MOS switch changes. For example, a notification message is sent when the first MOS switch is on; a notification message is sent again when the second MOS switch is on; and so on.

[0175] In other embodiments, the AP can send a notification message to the MCU during the first switch control. After receiving the gating strategy in the notification message, the MCU controls the first MOS switch and the second MOS switch to turn on and off according to the gating strategy.

[0176] S1708, the MCU receives the notification information and controls the first MOS switch to turn on and the second MOS switch to turn off.

[0177] The wireless charging path 1 can be turned on by the control in S1708, so that the electronic stylus can be charged through the wireless charging path 1.

[0178] In step S1709, AP determines whether the second MOS switch needs to be turned on based on the gating strategy. If the determination result is yes, it jumps to step S1710; if the determination result is no, it returns to step S1705.

[0179] The specific content of S1709 is similar to that of S1705. Please refer to the relevant description of S1705 in the above part of the embodiments of this application, and it will not be repeated here.

[0180] S1710, if the AP determines that the second MOS switch needs to be turned on, it sends a notification message to the MCU.

[0181] The content of S1710 is similar to that of S1707. Please refer to the relevant description of S1706 in the above part of the embodiments of this application, and it will not be repeated here.

[0182] In S1711, the MCU receives the notification information and controls the first MOS switch to turn off and the second MOS switch to turn on. The content of S1711 is similar to that of S1707; please refer to the description of S1707 in the above section of the embodiments of this application, and it will not be repeated here.

[0183] The wireless charging path 2 can be turned on by the control in S1711, so that the wireless keyboard can be charged through the wireless charging path 2.

[0184] Through steps S1701 to S1711 described above, the tablet computer can precisely control the wireless charging process for one device to two devices, improving charging accuracy. It is understood that the wireless charging process for one device to N devices is similar to the above process, except that after S1711, it includes steps such as the AP determining whether to turn on the third MOS switch, whether to notify the MCU to turn on the third MOS switch, and turning off the other N-1 MOS switches; ... until the AP determines whether to turn on the Nth MOS switch, whether to notify the MCU to turn on the Nth MOS switch, and turning off the other N-1 MOS switches. These steps will not be elaborated further.

[0185] Since the first MOS switch and the second MOS switch can also be controlled by the AP to switch on and off, this application embodiment also provides another wireless charging control method. Figure 18 A flowchart illustrating another wireless charging control method provided in an embodiment of this application is shown. Wherein, Figure 18 Another wireless charging control method shown may include S1801 to S1809.

[0186] Since each of the 18 MOS switches is controlled by the AP, correspondingly, in comparison... Figure 17 and Figure 18 As can be seen, the difference between the two is that, as shown in steps S1806-S1809, when it is determined that the first MOS switch needs to be turned on, the AP can directly control the first MOS switch to be turned on and the second MOS switch to be turned off. And, when it is determined that the second MOS switch needs to be turned on, the AP can directly control the first MOS switch to be turned off and the second MOS switch to be turned on.

[0187] in, Figure 18 For further details regarding the steps of the alternative wireless charging control method shown, please refer to the above-mentioned parts of the embodiments of this application. Figure 17 The relevant descriptions of each step of the wireless charging control method shown are not repeated here.

[0188] In some embodiments, the wireless charging control method described above may further include steps D1-D3.

[0189] Step D1: The temperature detection module detects the switching temperature data of the target MOS switch.

[0190] The target MOS switch can be either the first MOS switch or the second MOS switch that is in the ON state. Specifically, when the first MOS switch is ON and the second MOS switch is OFF, the temperature detection module can detect the switching temperature data of the first MOS switch. And, when the first MOS switch is OFF and the second MOS switch is ON, the temperature detection module can detect the switching temperature data of the second MOS switch.

[0191] Switch temperature data, i.e. data related to switch temperature, such as switch temperature value and / or temperature rise rate.

[0192] Step D2: If the switch temperature data exceeds the normal range of temperature data, the AP or MCU (i.e., the controller of the target MOS switch) turns off the target MOS switch.

[0193] In some embodiments, when the switch temperature data includes a switch temperature value, the AP or MCU can turn off the target MOS switch if the switch temperature value exceeds the temperature range. In other embodiments, when the switch temperature data includes a temperature rise rate, the AP or MCU can turn off the target MOS switch if the temperature rise rate exceeds the rise rate range. In still other embodiments, when the switch temperature data includes both the temperature rise rate and the switch temperature value, the AP or MCU can determine a switch temperature threshold (i.e., the upper limit of the temperature range) corresponding to the temperature rise rate, where a higher temperature rise rate corresponds to a lower switch temperature threshold. This allows for earlier and more timely shutdown of the target MOS switch when the temperature rise rate is fast, ensuring charging safety.

[0194] Step D3: After a preset time interval, the AP or MCU turns on the target MOS switch. Alternatively, the temperature detection module can re-detect the switching temperature data of the target MOS switch at preset time intervals. If the switching temperature data is within the normal range, the AP or MCU turns on the target MOS switch.

[0195] In some embodiments, the AP or MCU can pre-set a correspondence between switch temperature data and cooling time values. After acquiring the switch temperature data, the corresponding cooling time value can be determined, and then the target MOS switch is re-activated after an interval of this cooling time value. The higher the switch temperature data, the longer the corresponding cooling time value, allowing for flexible adjustment of the cooling time value based on the overheating level of the target MOS switch. This balances charging efficiency and tablet safety.

[0196] In some embodiments, when the switch temperature data exceeds a first data threshold but is less than a second data threshold (in which case an over-temperature fault can be determined in the target MOS switch), the AP or MCU can generate a pulsed control signal to control the target MOS switch to conduct intermittently. Conversely, when the switch temperature data exceeds the second temperature threshold (in which case an over-temperature fault can be determined in the target MOS switch), the AP or MCU can control the target MOS switch to deactivate. Thus, when the temperature of the target MOS switch is high, the problem can be mitigated by intermittently turning the target MOS switch on while maintaining charging efficiency; and if this method fails to effectively cool the switch, the target MOS switch can be turned off to rapidly cool it down.

[0197] Optionally, the duty cycle of the pulse control signal can be a fixed value, or it can be adjusted accordingly based on the switch temperature data. For example, the higher the switch temperature data, the lower the duty cycle of the pulse control signal, so as to increase the switch off time as the switch temperature rises. For instance, when the switch temperature data is a first temperature data, the pulse control signal has a first duty cycle; when the switch temperature data is a second temperature data, the pulse control signal has a second duty cycle, where the first temperature data is less than the second temperature data, and the first duty cycle is greater than the second duty cycle.

[0198] Considering that the integration of MOS switches would increase the heat generation of the MOS transistor, the applicant, through steps D1 to D3 above, can adjust the wireless charging process in real time according to the heat generation of the MOS transistor, thus balancing charging efficiency and device safety.

[0199] It is understood that electronic devices such as tablet computers include hardware and / or software modules that perform the respective functions in order to achieve the above-mentioned functions. Based on the algorithmic steps of the examples described in conjunction with the embodiments disclosed herein, this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in conjunction with the embodiments, but such implementation should not be considered beyond the scope of this application.

[0200] In one example, Figure 19 A schematic block diagram of an apparatus 1900 according to an embodiment of this application is shown. The apparatus 1900 may include a processor 1901 and a transceiver / transceiver pin 1902, and optionally, a memory 1903.

[0201] The various components of device 1900 are coupled together via bus 1904, which includes a data bus, a power bus, a control bus, and a status signal bus. However, for clarity, all buses are referred to as bus 1904 in the figure.

[0202] Optionally, the memory 1903 can be used for the instructions in the foregoing method embodiments. The processor 1901 can be used to execute the instructions in the memory 1903, control the receive pin to receive signals, and control the transmit pin to transmit signals.

[0203] Device 1900 may be an electronic device or a chip of an electronic device in the above method embodiments.

[0204] All relevant content of each step involved in the above method embodiments can be referenced from the functional description of the corresponding functional module, and will not be repeated here.

[0205] The steps performed by the tablet computer in the wireless charging control method provided in the above-described embodiments of this application can also be performed by a chip system included in the tablet computer. This chip system may include a processor and a Bluetooth chip. The chip system may be coupled to a memory, enabling it to call a computer program stored in the memory during runtime to implement the steps performed by the tablet computer. The processor in the chip system can be an application processor or a non-application processor.

[0206] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A wireless charging circuit, characterized in that, The wireless charging circuit is applied to the first electronic device, and the wireless charging circuit includes: First transmitting coil; Second transmitting coil; A wireless transmitting chip includes a processing circuit, a first MOS switch, and a second MOS switch; wherein the processing circuit is used to acquire the battery voltage of the first electronic device and generate an AC voltage based on the battery voltage; the processing circuit is connected to the first transmitting coil through the first MOS switch, and the processing circuit is connected to the second transmitting coil through the second MOS switch; Specifically, when the first MOS switch is on and the second MOS switch is off, the first transmitting coil is used to wirelessly charge the second electronic device according to the AC voltage; when the second MOS switch is on and the first MOS switch is off, the second transmitting coil is used to wirelessly charge the third electronic device according to the AC voltage. The first electronic device is used to wirelessly charge the second and third electronic devices with a first power, where the first power is less than a preset power threshold, and the preset power threshold is the charging power of a high-power charging device. The second electronic device and the third electronic device are accessories to the first electronic device; The wireless charging circuit also includes a temperature detection module and a first controller; wherein... The temperature detection module is used to detect the switching temperature data of the target MOS switch, which is the switch that is in the on state between the first MOS switch and the second MOS switch; The first controller is configured to generate a pulsed control signal to control the target MOS switch to be intermittently turned on when the switch temperature data is greater than a first data threshold and less than or equal to a second data threshold; and to control the target MOS switch to be turned off when the switch temperature data is greater than the second data threshold. Furthermore, the processing circuit includes an inverter circuit, and the inverter circuit includes a bootstrap circuit. The bootstrap circuit is used to generate the drive voltage of the MOS transistor in the inverter circuit, and is also used to raise the first control signal output by the first controller from a first level value to a second level value; the first controller is used to control the first MOS switch and the second MOS switch to be turned on or off using the first control signal of the second level value, wherein the first MOS switch and the second MOS switch are NMOS switches; The wireless transmitter chip also includes a heat-conducting layer. A first portion of the heat-conducting layer covers the first MOS switch and the second MOS switch, and a second portion of the heat-conducting layer covers a first region of the wireless transmitter chip. The temperature of the first region is lower than the temperature of the second region of the wireless transmitter chip. The second region is the area where the first MOS switch and the second MOS switch are located.

2. The wireless charging circuit according to claim 1, characterized in that, The first controller is configured to: in a first control phase, output a first control signal with the second level value to the control terminal of the first MOS switch to control the first MOS switch to be turned on; Furthermore, in the second control phase, a first control signal with the second level value is output to the control terminal of the second MOS switch to control the second MOS switch to turn on.

3. The wireless charging circuit according to claim 1 or 2, characterized in that, The wireless charging circuit also includes a second controller. The second controller is used to acquire a first detection signal sent by the first detection sensor and to acquire a second detection signal sent by the second detection sensor; In response to the first detection signal and the second detection signal, when it is determined that the first MOS switch is turned on, a notification signal is sent to the first controller, the notification signal being used to notify the first controller to control the first MOS switch to turn on; and when it is determined that the second MOS switch is turned on, a notification signal is sent to the first controller, the notification signal being used to notify the first controller to control the second MOS switch to turn on. Wherein, the first detection signal indicates that the second electronic device is placed at a first preset position of the first electronic device, and the second detection signal indicates that the third electronic device is placed at a second preset position of the first electronic device.

4. The wireless charging circuit according to claim 1 or 2, characterized in that, The wireless transmitting chip includes: The first output port is connected to one end of the first transmitting coil and one end of the second transmitting coil, respectively. The first output port is connected to the first output terminal of the processing circuit, and the second output terminal of the processing circuit is connected to the first connection terminal of the first MOS switch and the first connection terminal of the second MOS switch, respectively. The second output port is connected to the other end of the first transmitting coil, wherein the second output port is connected to the second connection terminal of the first MOS switch; The third output port is connected to the other end of the second transmitting coil, wherein the third output port is connected to the second connection terminal of the second MOS switch.

5. The wireless charging circuit according to claim 1, characterized in that, The wireless charging circuit further includes a second controller, which is configured to: in a first control phase, output a first control signal to the control terminal of the first MOS switch to control the first MOS switch to turn on; and in a second control phase, output the first control signal to the control terminal of the second MOS switch to control the second MOS switch to turn on.

6. The wireless charging circuit according to claim 5, characterized in that, The wireless transmitter chip also includes: A first control port is connected to a first output terminal of the second controller, wherein the first control port is connected to the control terminal of the first MOS switch; The second control port is connected to the second output terminal of the second controller, wherein the second control port is connected to the control terminal of the second MOS switch.

7. The wireless charging circuit according to claim 1, characterized in that, The first electronic device is used to wirelessly charge the second and third electronic devices at a first power, wherein the first power is less than a preset power threshold.

8. The wireless charging circuit according to claim 7, characterized in that, The value range of the first power is [1W, 5W].

9. The wireless charging circuit according to claim 1, characterized in that, The second electronic device and the third electronic device are accessories of the first electronic device; In the case where the first electronic device includes a tablet computer, the second electronic device is an electronic stylus, and the third electronic device is a wireless keyboard; In the case where the first electronic device includes an earphone case, the second electronic device is the left earphone, and the third electronic device is the right earphone.

10. A wireless charging circuit, characterized in that, The wireless charging circuit is applied to the first electronic device, and the wireless charging circuit includes: First transmitting coil; Second transmitting coil; A first MOS switch is connected to the first transmitting coil; The second MOS switch is connected to the second transmitting coil, wherein the first MOS switch and the second MOS switch are NMOS transistors; A wireless transmitting chip includes a processing circuit, a bootstrap circuit, and a first controller; wherein, the processing circuit is used to acquire the battery voltage of the first electronic device and generate an AC voltage based on the battery voltage; the processing circuit is connected to the first transmitting coil through a first MOS switch, and the processing circuit is connected to the second transmitting coil through a second MOS switch; the bootstrap circuit is used to amplify a first control signal output by the first controller from a first level value to a second level value; the first controller is used to control the first MOS switch or the second MOS switch to turn on using the first control signal at the second level value; Specifically, when the first MOS switch is on and the second MOS switch is off, the first transmitting coil is used to wirelessly charge the second electronic device according to the AC voltage; when the second MOS switch is on and the first MOS switch is off, the second transmitting coil is used to wirelessly charge the third electronic device according to the AC voltage. The first electronic device is used to wirelessly charge the second and third electronic devices with a first power, where the first power is less than a preset power threshold, and the preset power threshold is the charging power of a high-power charging device. The second electronic device and the third electronic device are accessories to the first electronic device; The wireless charging circuit also includes a temperature detection module; wherein... The temperature detection module is used to detect the switching temperature data of the target MOS switch, which is the switch that is in the on state between the first MOS switch and the second MOS switch; The first controller is configured to generate a pulsed control signal to control the target MOS switch to be intermittently turned on when the switch temperature data is greater than a first data threshold and less than or equal to a second data threshold; and to control the target MOS switch to be turned off when the switch temperature data is greater than the second data threshold. The wireless transmitter chip also includes a heat-conducting layer. A first portion of the heat-conducting layer covers the first MOS switch and the second MOS switch, and a second portion of the heat-conducting layer covers a first region of the wireless transmitter chip. The temperature of the first region is lower than the temperature of the second region of the wireless transmitter chip. The second region is the area where the first MOS switch and the second MOS switch are located.

11. A wireless transmitting chip, characterized in that, The wireless transmitting chip, used in a first electronic device, comprises: A processing circuit is used to acquire the battery voltage of the first electronic device and generate an AC voltage based on the battery voltage; A first MOS switch, the first connection terminal of the first MOS switch is connected to the processing circuit, and the second connection terminal of the first MOS switch is used to connect to the first transmitting coil of the first electronic device; A second MOS switch, the first connection terminal of the second MOS switch is connected to the processing circuit, and the second connection terminal of the second MOS switch is used to connect to the second transmitting coil of the first electronic device; Specifically, when the first MOS switch is on and the second MOS switch is off, the first transmitting coil is used to wirelessly charge the second electronic device according to the AC voltage; when the second MOS switch is on and the first MOS switch is off, the second transmitting coil is used to wirelessly charge the third electronic device according to the AC voltage. The first electronic device is used to wirelessly charge the second and third electronic devices with a first power, where the first power is less than a preset power threshold, and the preset power threshold is the charging power of a high-power charging device. The second electronic device and the third electronic device are accessories to the first electronic device; The wireless transmission chip also includes a temperature detection module and a first controller; wherein... The temperature detection module is used to detect the switching temperature data of the target MOS switch, which is the switch that is in the on state between the first MOS switch and the second MOS switch; The first controller is configured to generate a pulsed control signal to control the target MOS switch to be intermittently turned on when the switch temperature data is greater than a first data threshold and less than a second data threshold; and to control the target MOS switch to be turned off when the switch temperature data is greater than the second data threshold. Furthermore, the processing circuit includes an inverter circuit, and the inverter circuit includes a bootstrap circuit. The bootstrap circuit is used to generate the drive voltage of the MOS transistor in the inverter circuit, and is also used to raise the first control signal output by the first controller from a first level value to a second level value; the first controller is used to control the first MOS switch and the second MOS switch to be turned on or off using the first control signal of the second level value, wherein the first MOS switch and the second MOS switch are NMOS switches; The wireless transmitter chip also includes a heat-conducting layer. A first portion of the heat-conducting layer covers the first MOS switch and the second MOS switch, and a second portion of the heat-conducting layer covers a first region of the wireless transmitter chip. The temperature of the first region is lower than the temperature of the second region of the wireless transmitter chip. The second region is the area where the first MOS switch and the second MOS switch are located.

12. The wireless transmitting chip according to claim 11, characterized in that, The first controller is configured to: in a first control phase, output a first control signal with the second level value to the control terminal of the first MOS switch to control the first MOS switch to be turned on; Furthermore, in the second control phase, a first control signal with the second level value is output to the control terminal of the second MOS switch to control the second MOS switch to turn on.

13. An electronic device, characterized in that, include: The wireless charging circuit as described in any one of claims 1-9, or the wireless charging circuit as described in claim 10.

14. A wireless charging system, characterized in that, include: A first electronic device, the first electronic device comprising a wireless charging circuit as described in any one of claims 1-9 or a wireless charging circuit as described in claim 10; The second electronic device includes a first receiving coil, a first charging control circuit, and a first battery; The first receiving coil is configured to correspond to the first transmitting coil. The first receiving coil is used to receive the first magnetic field signal sent by the first transmitting coil and to generate a first alternating current based on the first magnetic field signal. The first charging control circuit is used to charge the first battery based on the first alternating current. The third electronic device includes a second receiving coil, a second charging control circuit, and a second battery. The second receiving coil is correspondingly arranged with the second transmitting coil. The second receiving coil is used to receive a second magnetic field signal sent by the second transmitting coil and to generate a second alternating current based on the second magnetic field signal. The second charging control circuit is used to charge the second battery based on the second alternating current.

15. The wireless charging system according to claim 14, characterized in that, The second electronic device and the third electronic device are accessories of the first electronic device; Wherein, if the first electronic device includes a tablet computer, the second electronic device is an electronic stylus, and the third electronic device is a wireless keyboard; In the case where the first electronic device includes an earphone case, the second electronic device is the left earphone, and the third electronic device is the right earphone.

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