Wireless charging module, control circuit and electronic device

Abstract

This application relates to the field of wireless charging technology, and more particularly to a wireless charging module, control circuit, and electronic device. The wireless charging module includes a control circuit, a charging coil, an adjustable capacitor module, and a converter circuit. The converter circuit includes at least one of a rectifier circuit or an inverter circuit. The adjustable capacitor module is connected in series between the charging coil and the converter circuit. The adjustable capacitor module includes multiple capacitors and at least one controllable switch. The control circuit can control the at least one controllable switch to turn on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module. The equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value. Using the embodiments of this application, the wireless charging module can be compatible with constant voltage frequency modulation charging mode while also charging in a more efficient operating mode, thus improving the applicability and practicality of wireless charging technology.

Description

Technical Field

[0001] This application relates to the field of wireless charging technology, and in particular to a wireless charging module, control circuit, and electronic device. Background Technology

[0002] With the increasing prevalence of electrical devices and the continuous development of electromagnetic technology, wireless charging technology has gradually become a reality. To achieve compatibility with both conventional constant-voltage frequency modulation charging modes and proprietary fast charging modes, existing wireless charging technologies design the resonant capacitors of both the wireless charging receiver and transmitter devices to support the constant-voltage frequency modulation charging mode. This results in lower efficiency for both the wireless charging transmitter and receiver devices, significant charging losses and temperature rise in proprietary fast charging modes, and a tendency to trigger overheating and power descent, thus limiting the improvement of average charging speed. Summary of the Invention

[0003] To address the aforementioned issues, this application provides a wireless charging module, control circuit, and electronic device, which can improve the applicability and practicality of wireless charging technology.

[0004] In a first aspect, embodiments of this application provide a wireless charging module, which includes a control circuit, a charging coil, an adjustable capacitor module, and a converter circuit. The converter circuit includes at least one of a rectifier circuit or an inverter circuit. The adjustable capacitor module is connected in series between the charging coil and the converter circuit, and includes multiple capacitors and at least one controllable switch. The control circuit is used to control the at least one controllable switch to turn on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module, wherein the equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value.

[0005] The wireless charging module and its control circuit provided in this application can control the equivalent capacitance value of the adjustable capacitor module through at least one controllable switch. This allows the wireless charging module to adapt to different working scenarios by changing the equivalent capacitance value of the adjustable capacitor module 22. It can operate in a biased inductive state under conventional constant voltage frequency modulation charging mode to ensure compatibility with this mode, and also operate in a resonant or near-resonant state with high charging efficiency to reduce charging losses and improve charging efficiency. Therefore, the wireless charging module 20 provided in this application is compatible with constant voltage frequency modulation charging mode while also enabling charging in a more efficient working mode, significantly improving the applicability and practicality of wireless charging technology.

[0006] In conjunction with the first aspect, in one possible implementation, the adjustable capacitor module includes a first capacitor, at least one parallel capacitor, and at least one controllable switch. The first capacitor is connected in series between the charging coil and the converter circuit. The at least one parallel capacitor is connected in parallel with the first capacitor through at least one controllable switch. In response to the shutdown of one or more of the at least one controllable switch, the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance. In response to the full activation of at least one controllable switch, the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance.

[0007] In this embodiment, the adjustable capacitor module comprises a first capacitor, at least one parallel capacitor, and at least one controllable switch connected in series with each of the at least one parallel capacitor. The adjustable capacitor module of the wireless charging module provided in this embodiment has a simple structure and low cost, ensuring the compatibility of the charging modes of the wireless charging module without significantly increasing the cost of the wireless charging module.

[0008] In conjunction with the first aspect, in one possible implementation, the adjustable capacitor module includes a first capacitor, at least one series capacitor, and at least one controllable switch. The first capacitor and the at least one series capacitor are connected in series between the charging coil and the converter circuit. The at least one controllable switch is connected in parallel with each of the at least one series capacitor. In response to the shutdown of one or more of the at least one controllable switch, the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance value. In response to the full activation of all at least one controllable switch, the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance value.

[0009] In this embodiment, the adjustable capacitor module comprises a first capacitor, at least one series capacitor, and at least one controllable switch, with one series capacitor connected in parallel with one controllable switch. The adjustable capacitor module in the wireless charging module provided in this embodiment withstands low voltage stress, enabling the wireless charging module to be applied to high-voltage, low-current wireless charging scenarios, thus improving the applicability of the wireless charging module.

[0010] In conjunction with the first aspect, in one possible implementation, the wireless charging module generates an alternating magnetic field, the inverter circuit converts direct current (DC) to alternating current (AC), and the charging coil receives the AC and generates the alternating magnetic field. The inverter circuit can operate in either a fixed-frequency voltage regulation mode or a fixed-voltage frequency regulation mode. In response to the inverter circuit operating in the fixed-frequency voltage regulation mode, the control circuit can control one or more controllable switches of the adjustable capacitor module to turn off. In response to the inverter circuit operating in the fixed-voltage frequency regulation mode, the control circuit controls all controllable switches of the adjustable capacitor module to turn on.

[0011] In this embodiment, the wireless charging module can adjust the equivalent capacitance of the adjustable capacitor module according to the operating mode of the included inverter circuit, so that the resonant frequency of the adjustable capacitor module and the charging coil is equal to the operating frequency of the inverter circuit. This allows the wireless charging module to operate in a resonant or near-resonant state with high charging efficiency, thereby reducing charging losses. Alternatively, the resonant frequency of the adjustable capacitor module and the charging coil can be made less than the minimum operating frequency of the inverter circuit, enabling it to operate in a biased inductive state under conventional constant voltage frequency modulation charging mode, thus ensuring compatibility with conventional constant voltage frequency modulation charging mode.

[0012] In conjunction with the first aspect, in one possible implementation, the control circuit controls one or more of at least one controllable switch to turn off, such that the resonant frequency of the adjustable capacitor module and the charging coil is equal to the operating frequency of the inverter circuit. Alternatively, the control circuit controls all at least one controllable switch to turn on, such that the resonant frequency of the adjustable capacitor module and the charging coil is less than the minimum operating frequency of the inverter circuit.

[0013] In conjunction with the first aspect, in one possible implementation, the aforementioned wireless charging module may further include a DC / DC converter circuit. This DC / DC converter circuit is connected to a DC source, an inverter circuit, and a control circuit. In actual operation, under the control of the control circuit, the DC / DC converter circuit can convert the DC power supplied by the DC source into DC power with the target voltage required by the inverter circuit, and output this DC power to the inverter circuit.

[0014] In this embodiment, the wireless charging module further includes a DC / DC conversion circuit. The wireless charging module converts the DC power supplied by the DC source into DC power with the voltage required by the inverter circuit through the DC / DC conversion circuit, which can improve the adaptability of the wireless charging module to the DC source.

[0015] In conjunction with the first aspect, in one possible implementation, the aforementioned wireless charging module is used to receive an alternating magnetic field, the charging coil is used to receive the alternating magnetic field generated by the wireless power supply device and output AC power, and the rectifier circuit is used to convert the AC power to DC power. Specifically: in response to the wireless power supply device operating in a fixed-frequency voltage regulation mode, the control circuit controls the shutdown of one or more of at least one controllable switches. Alternatively, in response to the wireless power supply device operating in a fixed-voltage frequency regulation mode, the control circuit controls all at least one controllable switch to be turned on. The control circuit is also used to control the rectifier circuit to operate in a half-bridge voltage doubler rectification mode or a full-bridge rectification mode based on the induced voltage of the charging coil.

[0016] In this embodiment, the wireless charging module adjusts the equivalent capacitance of the adjustable capacitor module according to the working mode of the wireless power supply device, so that the resonant frequency of the adjustable capacitor module and the charging coil is equal to the working frequency of the alternating magnetic field provided by the wireless power supply device, or less than the minimum working frequency of the alternating magnetic field provided by the wireless power supply device. This allows the wireless charging module to work in a resonant or near-resonant state with high charging efficiency, as well as in a biased inductive state under the conventional constant voltage frequency modulation charging mode.

[0017] In conjunction with the first aspect, in one possible implementation, the rectifier circuit includes a first half-bridge and a second half-bridge connected in parallel. The controller, in response to the induced voltage of the charging coil being less than or equal to a preset voltage, controls the upper and lower arms of the first half-bridge to alternately turn on or off, and the upper arm of the second half-bridge to turn on and the lower arm to turn off, or vice versa, so that the rectifier circuit operates in a half-bridge voltage multiplier rectification mode. In response to the induced voltage of the charging coil being greater than the preset voltage, the controller controls the upper arm of the first half-bridge and the lower arm of the second half-bridge, and vice versa, to alternately turn on or off, so that the rectifier circuit operates in a full-bridge rectification mode.

[0018] In this embodiment, the control circuit is also used to control the rectifier circuit to operate in half-bridge voltage doubler rectification mode or full-bridge rectification mode according to the induced voltage of the charging coil, thereby controlling the magnitude of the DC voltage provided by the rectifier circuit to the load. This can improve the adaptability of the wireless charging module to the load and wireless power supply equipment.

[0019] In conjunction with the first aspect, in one possible implementation, the control circuit controls the shutdown of one or more controllable switches of at least one adjustable capacitor module, such that the resonant frequency of the adjustable capacitor module and the charging coil is equal to a preset frequency or the operating frequency of the alternating magnetic field provided by the wireless power supply device. Alternatively, the control circuit controls all at least one controllable switch to be turned on, such that the resonant frequency of the adjustable capacitor module and the charging coil is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device.

[0020] In conjunction with the first aspect, in one possible implementation, the wireless charging module further includes a DC / DC converter connected to a rectifier circuit, a load, and a control circuit. In actual operation, under the control of the control circuit, the DC / DC converter can convert the DC power output from the rectifier circuit into DC power at a preset target voltage and output this DC power to the load.

[0021] In this embodiment, the wireless charging module also includes a DC / DC converter circuit. The wireless charging module converts the DC power output from the rectifier circuit into DC power with a preset voltage through the DC / DC converter circuit. This can further expand the adjustment range of the output voltage of the wireless charging module, thereby improving the adaptability of the wireless charging module to the load.

[0022] Secondly, this application provides a control circuit for a wireless charging module, applicable to scenarios where the wireless charging module receives DC power and emits an alternating magnetic field. The wireless charging module includes a control circuit, a charging coil, an adjustable capacitor module, and an inverter circuit. The adjustable capacitor module is connected in series between the charging coil and the inverter circuit. The adjustable capacitor module includes multiple capacitors and at least one controllable switch. The control circuit controls the at least one controllable switch to be turned on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module. The equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value. The control circuit controls the operation of the inverter circuit in a fixed-frequency voltage regulation mode or a fixed-voltage frequency regulation mode, and is used to: in response to the inverter circuit operating in a fixed-frequency voltage regulation mode, control the equivalent capacitance value of the adjustable capacitor module to be equal to the first capacitance value; or, in response to the inverter circuit operating in a fixed-voltage frequency regulation mode, control the equivalent capacitance value of the adjustable capacitor module to be equal to the second capacitance value.

[0023] In conjunction with the second aspect, in one possible implementation, the adjustable capacitor module includes a first capacitor, at least one parallel capacitor, and the at least one controllable switch. The first capacitor is connected in series between the charging coil and the converter circuit. The at least one parallel capacitor is connected in parallel with the first capacitor through at least one controllable switch. Specifically: the control circuit controls one or more of the at least one controllable switches to turn off, such that the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance. Alternatively, the control circuit controls all at least one controllable switch to turn on, such that the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance.

[0024] In conjunction with the second aspect, in one possible implementation, the adjustable capacitor module includes a first capacitor, at least one series capacitor, and at least one controllable switch. The first capacitor and the at least one series capacitor are connected in series between the charging coil and the converter circuit. The at least one controllable switch is connected in parallel with each of the at least one series capacitor. Specifically: the control circuit controls one or more of the at least one controllable switches to turn off, such that the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance value. Alternatively, the control circuit controls all at least one controllable switch to turn on, such that the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance value.

[0025] Thirdly, this application provides a control circuit for a wireless charging module, applicable to scenarios where the wireless charging module receives an alternating magnetic field and outputs direct current. The wireless charging module includes a control circuit, a charging coil, an adjustable capacitor module, and a rectifier circuit. The charging coil receives the alternating magnetic field. The adjustable capacitor module is connected in series between the charging coil and the rectifier circuit. The adjustable capacitor module includes multiple capacitors and at least one controllable switch. The control circuit controls the at least one controllable switch to be turned on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module. The equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value. The control circuit is configured to: in response to the wireless power supply device operating in a constant voltage frequency modulation mode, control the equivalent capacitance value of the adjustable capacitor module to be equal to the first capacitance value; or, in response to the wireless power supply device operating in a constant frequency voltage modulation mode, control the equivalent capacitance value of the adjustable capacitor module to be equal to or less than the second capacitance value and greater than the first capacitance value. The rectifier circuit is controlled to operate in either half-bridge voltage doubler rectification mode or full-bridge rectification mode based on the induced voltage of the charging coil.

[0026] In conjunction with the third aspect, in one possible implementation, the controller is configured to: control the rectifier circuit to operate in the half-bridge voltage doubler rectification mode in response to the induced voltage of the charging coil being less than or equal to a preset voltage; and control the bridge rectifier circuit to operate in the full-bridge rectification mode in response to the induced voltage of the charging coil being greater than the preset voltage.

[0027] In conjunction with the third aspect, in one possible implementation, the rectifier circuit includes a first half-bridge and a second half-bridge connected in parallel. The controller is configured to: control the upper and lower arms of the first half-bridge to alternately turn on or off, and the upper arm of the second half-bridge to turn on and the lower arm to turn off, or vice versa, so that the rectifier circuit operates in the half-bridge voltage multiplier rectification mode. Alternatively, the controller can control the upper arm of the first half-bridge and the lower arm of the second half-bridge, and vice versa, to alternately turn on or off, so that the rectifier circuit operates in the full-bridge rectification mode.

[0028] Fourthly, this application provides an electronic device, including the wireless charging module described in the first aspect or any possible implementation thereof, or the control circuit described in the second aspect, the third aspect, or any possible implementation thereof.

[0029] The solutions provided in the second to fourth aspects above are used to implement or cooperate with the implementation of the wireless charging module provided in any of the first aspects above, and therefore can achieve the same or corresponding beneficial effects as the first aspect, which will not be elaborated here.

[0030] In summary, by implementing the embodiments of this application, the wireless charging module can be compatible with the conventional constant voltage frequency modulation charging mode while also being able to charge in a more efficient working mode, thereby improving the applicability and practicality of wireless charging technology. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of an electronic device provided in this application;

[0032] Figure 2 This is yet another structural schematic diagram of an electronic device provided in this application;

[0033] Figure 3 This is yet another structural schematic diagram of an electronic device provided in this application;

[0034] Figure 4 This is a schematic diagram of the structure of the wireless charging module provided in this application;

[0035] Figure 5 This is another structural schematic diagram of the wireless charging module provided in this application;

[0036] Figure 6 This is another structural schematic diagram of the wireless charging module provided in this application;

[0037] Figure 7 This is a schematic diagram illustrating one application scenario of the electronic device provided in this application;

[0038] Figure 8 This is another structural schematic diagram of the wireless charging module provided in this application;

[0039] Figure 9 This is another structural schematic diagram of the wireless charging module provided in this application;

[0040] Figure 10 This is a schematic diagram illustrating another application scenario of the electronic device provided in this application;

[0041] Figure 11 This is another structural schematic diagram of the wireless charging module provided in this application;

[0042] Figure 12 This is another structural schematic diagram of the wireless charging module provided in this application;

[0043] Figure 13 This is another structural schematic diagram of the wireless charging module provided in this application. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0045] It is understood that the connection relationships described in this application refer to direct or indirect connections. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components. For instance, A can be directly connected to C, and C can be directly connected to B, thus achieving a connection between A and B through C. It is also understood that the "A connects to B" described in this application can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0046] In the description of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. In the description of this application, the words "first," "second," etc., are only used to distinguish different objects and do not limit the quantity or order of execution, nor do they necessarily imply that they are different. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0047] Existing wireless charging technologies suffer from limitations in their resonant capacitor design to achieve compatibility with both conventional constant-voltage frequency modulation charging modes and proprietary fast charging modes. This leads to low efficiency for both the wireless charging transmitter and receiver, significant power loss and temperature rise in proprietary fast charging modes, and a tendency to trigger over-temperature power derating, thus limiting the improvement of average charging speed. Therefore, the technical problem this application aims to solve is: how to improve the charging efficiency of wireless charging while maintaining compatibility with conventional constant-voltage frequency modulation charging modes, thereby enhancing the applicability and practicality of wireless charging technology.

[0048] To address the aforementioned issues, this application provides a wireless charging module, a control circuit, and an electronic device. In the wireless charging module, an adjustable capacitor module with a variable capacitance value is used as a compensation capacitor. The equivalent capacitance value of the adjustable capacitor module is adjusted according to different operating scenarios, allowing the wireless charging module to operate in both a high-efficiency resonant or near-resonant state and a slightly inductive state in a constant-voltage frequency modulation charging mode. In this embodiment, the slightly inductive state refers to the state where the resonant frequency between the charging coil and the adjustable capacitor module in the wireless charging module is less than the minimum operating frequency of the inverter circuit or alternating magnetic field. The wireless charging module provided by this application is compatible with the constant-voltage frequency modulation charging mode while also enabling charging in a more efficient operating mode, significantly improving the applicability and practicality of wireless charging technology.

[0049] Figure 1 This is a schematic diagram of the structure of an electronic device provided in this application.Figure 1 As shown, the electronic device 10 may include a wireless charging module 20 and a load 30. The wireless charging module 20 includes a rectifier circuit. The electronic device 10 is used to receive the alternating magnetic field provided by the wireless power supply device 40 and provide DC power Ud1 ​​to the load 30. Alternatively, the electronic device 10 operates as a wireless charging receiver. Specifically, the wireless charging module 20 is used to receive the alternating magnetic field generated by the wireless power supply device 40 and generate a corresponding DC power Ud1. The wireless charging module 20 outputs DC power Ud1 ​​to power the load 30. In this embodiment, the electronic device 10 may be a wireless charging-enabled mobile phone, laptop, computer case, electric vehicle, smart speaker, smartwatch, or wearable device, etc.

[0050] Figure 2 This is yet another structural schematic diagram of an electronic device provided in this application. For example... Figure 2 As shown, the electronic device 10 may include a wireless charging module 20. The wireless charging module 20 may include a rectifier circuit. The electronic device 10 is used to receive the alternating magnetic field provided by the wireless power supply device 40 and provide DC power Ud1 ​​to the load 30. Specifically, the wireless charging module 20 is used to receive the alternating magnetic field provided by the wireless power supply device 40 and generate DC power Ud1. The electronic device 10 outputs DC power Ud1 ​​to power the load 30. In this embodiment, the electronic device 10 may be a power module or adapter for a wireless charging-enabled device such as a mobile phone, laptop, computer case, electric vehicle, smart speaker, smartwatch, or wearable device.

[0051] Figure 3 This is yet another structural schematic diagram of an electronic device provided in this application. For example... Figure 3 As shown, the electronic device 10 may include a wireless charging module 20. The wireless charging module 20 may include an inverter circuit. The electronic device 10 can act as a wireless charging transmitter to provide an alternating magnetic field to its corresponding wireless charging receiver 60. Specifically, the wireless charging module 20 can receive DC power Ud2 provided by a DC source 50, convert the DC power Ud2 into an alternating magnetic field, and transmit the alternating magnetic field to the wireless charging receiver 60. In this embodiment, the electronic device 10 may be a wireless charging adapter, a wireless charging pile, a wireless charging base, a wireless charging transmitter placed on or under the ground, or other devices that support wireless charging.

[0052] In this embodiment, the adapter may also be referred to as a charger, charging head, switch power supply, or power converter, etc. In this embodiment, the wireless charging receiver device 60 can be any type of device capable of receiving alternating magnetic fields and generating corresponding direct current.

[0053] In this embodiment, the electronic device 10 can act as a wireless charging transmitter to provide an alternating magnetic field to other devices, and also as a wireless charging receiver to obtain an alternating magnetic field from a wireless power supply and provide the required DC power to the load. Specifically, the wireless charging module 20 of the electronic device 10 can include a rectifier circuit and an inverter circuit. In one embodiment, the rectifier circuit and inverter circuit of the wireless charging module 20 can also be bridge circuits. Exemplarily, a bridge circuit can implement rectification or inversion.

[0054] In this application, the DC source 50 can be a device of different forms capable of providing the required DC power to the wireless charging module 20. The load 30 of the electronic device 10 can include one or more of a power-consuming device, an energy storage device, or an external device. In one embodiment, the load 30 can be a power-consuming device of the electronic device 10. For example, the load 30 can be a processor, a display, etc. In one embodiment, the load 30 can also be an energy storage device of the electronic device 10. For example, the load 30 can be a battery. In one embodiment, the load 30 can also be an external device of the electronic device 10. For example, the load 30 can be a display, a keyboard, etc.

[0055] The following will combine Figures 4 to 13 This application provides a detailed description of the structure and function of the wireless charging module 20 and the control circuit used in the wireless charging module 20.

[0056] Figure 4 This is a structural schematic diagram of the wireless charging module provided in this application. Figure 4 As shown, the wireless charging module 20 includes a charging coil 21, an adjustable capacitor module 22, a converter circuit 23, and a control circuit 24. The converter circuit 23 includes at least one of a rectifier circuit 231 and an inverter circuit 232. Specifically, the converter circuit 23 includes both a rectifier circuit 231 and an inverter circuit 232. Alternatively, the converter circuit 23 includes only a rectifier circuit 231. Alternatively, the converter circuit 23 includes only an inverter circuit 232. The adjustable capacitor module 22 is connected in series between the charging coil 21 and the converter circuit 23.

[0057] The adjustable capacitor module 22 includes multiple capacitors and at least one controllable switch. In embodiments of this application, the equivalent capacitance value of the adjustable capacitor module 22 includes multiple selectable capacitance values. In one embodiment, the equivalent capacitance value of the adjustable capacitor module 22 includes at least a first capacitance value c1 and a second capacitance value c2. The second capacitance value c2 is greater than the first capacitance value c1.

[0058] The control circuit 24 is used to control the equivalent capacitance value of the adjustable capacitor module 22. Specifically, the control circuit 24 is used to control at least one controllable switch of the adjustable capacitor module 22 to be turned on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module 22.

[0059] In one embodiment, when the wireless charging module 20 receives the alternating magnetic field provided by the wireless power supply device 40 and outputs DC current Ud1, the control circuit 24 controls the equivalent capacitance of the adjustable capacitor module 22 to a first capacitance value c1. The resonant frequency of the charging coil 21 and the adjustable capacitor module 22 is equal to the operating frequency or a preset frequency of the alternating magnetic field provided by the wireless power supply device 40. Accordingly, the wireless charging module 20 operates in a resonant or near-resonant state, thereby improving the charging efficiency of the wireless charging module 20 and reducing its charging loss. In this embodiment, the preset frequency is selected by comprehensively considering factors such as charging efficiency and EMC within the allowable frequency range. From the perspective of charging efficiency, the wireless charging module 20 has the lowest charging loss at the preset frequency.

[0060] In one embodiment, when the wireless charging module 20 receives the alternating magnetic field provided by the wireless power supply device 40 and outputs DC current Ud1, the control circuit 24 controls the equivalent capacitance of the adjustable capacitor module 22 to a second capacitance value c2. The resonant frequency of the charging coil 21 and the adjustable capacitor module 22 is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device 40. Accordingly, the wireless charging module 20 operates in a biased inductive state.

[0061] In one embodiment, when the wireless charging module 20 receives DC power Ud2 and emits an alternating magnetic field, the control circuit 24 controls the equivalent capacitance of the adjustable capacitor module 22 to a first capacitance value c1. The resonant frequency of the charging coil 21 and the adjustable capacitor module 22 is equal to the operating frequency of the inverter circuit 232 of the wireless charging module 20. Accordingly, the wireless charging module 20 operates in a resonant or near-resonant state, thereby improving the charging efficiency of the wireless charging module 20 and reducing its charging loss.

[0062] In one embodiment, when the wireless charging module 20 receives DC power Ud2 and emits an alternating magnetic field, the control circuit 24 controls the equivalent capacitance of the adjustable capacitor module 22 to a second capacitance value c2. The resonant frequency of the charging coil 21 and the adjustable capacitor module 22 is less than the minimum operating frequency of the inverter circuit 232. Accordingly, the wireless charging module 20 operates in a biased inductive state.

[0063] The wireless charging module 20 and its control circuit 24 provided in this application embodiment can control the equivalent capacitance value of the adjustable capacitor module 22 through at least one controllable switch of the adjustable capacitor module 22, so that the wireless charging module 20 can adapt to different working scenarios by changing the equivalent capacitance value of the adjustable capacitor module 22. The wireless charging module 20 can operate in a biased inductive state to ensure compatibility with the conventional constant voltage frequency modulation charging mode, and can also operate in a resonant or near-resonant state with high charging efficiency to reduce charging loss, thereby improving charging efficiency. Therefore, the wireless charging module 20 provided in this application can charge in a more efficient working mode while being compatible with the constant voltage frequency modulation charging mode, which can improve the applicability and practicality of wireless charging technology.

[0064] Figure 5 This is another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 5 As shown, the adjustable capacitor module 22 of the wireless charging module 20 includes multiple capacitors and at least one controllable switch. The multiple capacitors include a first capacitor Cp1 and at least one parallel capacitor. The first capacitor Cp1 is connected in series between the charging coil 21 and the converter circuit 23. Each of the at least one parallel capacitor is connected in parallel with the first capacitor Cp1 via at least one controllable switch. Alternatively, each of the at least one parallel capacitors is connected in series with one of the at least one controllable switches, and also in series with the first capacitor Cp1.

[0065] For example, at least one parallel capacitor includes parallel capacitors Cp2, Cp3, and Cp4. For example, at least one controllable switch includes controllable switch S1, controllable switch S2, and controllable switch S3. Figure 5 As shown, parallel capacitor Cp2 is connected in series with controllable switch S1, and the two are connected in parallel across the first capacitor Cp1. Parallel capacitor Cp3 is connected in series with controllable switch S2, and the two are connected in parallel across the first capacitor Cp1. Parallel capacitor Cp4 is connected in series with controllable switch S3, and the two are connected in parallel across the first capacitor Cp1.

[0066] In this embodiment, the control circuit 24 is used to control one or more controllable switches of the adjustable capacitor module 22 to be turned on or off. In one embodiment, the control circuit 24 controls one or more controllable switches of the adjustable capacitor module 22 to be turned off, and the equivalent capacitance of the adjustable capacitor module 22 is a first capacitance value c1. Alternatively, the control circuit 24 controls all at least one controllable switch of the adjustable capacitor module 22 to be turned on, and the equivalent capacitance of the adjustable capacitor module 22 is a second capacitance value c2.

[0067] like Figure 5 As shown, the capacitance of the first capacitor Cp1 is equal to the first capacitance value c1. When the first capacitor Cp1 is connected in parallel with parallel capacitors Cp2, Cp3, and Cp4, the capacitance is equal to the second capacitance value c2. For example, control circuit 24 controls all controllable switches S1, S2, and S3 to be off, and the equivalent capacitance of the adjustable capacitor module 22 is at its minimum value. Control circuit 24 controls all controllable switches S1, S2, and S3 to be on, and the equivalent capacitance of the adjustable capacitor module 22 is at its maximum value. Control circuit 24 controls one or more of controllable switches S1, S2, and S3 to be on, which can control the equivalent capacitance of the adjustable capacitor module 22 to change between the minimum and maximum values.

[0068] In this embodiment, the adjustable capacitor module 22 comprises a first capacitor Cp1, at least one parallel capacitor, and at least one controllable switch connected in series with each of the at least one parallel capacitor. The adjustable capacitor module 22 of the wireless charging module 20 provided in this embodiment has a simple structure and low cost, which not only ensures the compatibility of the charging modes of the wireless charging module 20, but also does not significantly increase the cost of the wireless charging module 20.

[0069] Figure 6 This is another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 6 As shown, the adjustable capacitor module 22 of the wireless charging module 20 may include multiple capacitors and at least one controllable switch. The multiple capacitors include a first capacitor Cp1 and at least one series capacitor. The first capacitor Cp1 and the at least one series capacitor are connected in series between the charging coil 21 and the converter circuit 23. The at least one series capacitor is connected in parallel with at least one controllable switch. Alternatively, each of the at least one controllable switch is connected in parallel with one of the at least one series capacitors.

[0070] For example, at least one series capacitor includes series capacitors Cp5, Cp6, and Cp7. For example, at least one controllable switch includes controllable switch S1, controllable switch S2, and controllable switch S3. Figure 6As shown, the first capacitor Cp1 is connected in series with series capacitors Cp5, Cp6 and Cp7, and the controllable switch S1 is connected in parallel with series capacitor Cp5, the controllable switch S2 is connected in parallel with series capacitor Cp6, and the controllable switch S3 is connected in parallel with series capacitor Cp7.

[0071] In this embodiment, the control circuit 24 is used to control one or more of the at least one controllable switches to be turned off or on. In one embodiment, the control circuit 24 controls one or more of the at least one controllable switch of the adjustable capacitor module 22 to be turned off, and the equivalent capacitance of the adjustable capacitor module 22 is a first capacitance value c1. Alternatively, the control circuit 24 controls all at least one controllable switch of the adjustable capacitor module 22 to be turned on, and the equivalent capacitance of the adjustable capacitor module 22 is a second capacitance value c2.

[0072] like Figure 6 As shown, the capacitance of the first capacitor Cp1 is equal to the second capacitance c2. The capacitance of the first capacitor Cp1 connected in series with capacitors Cp5, Cp6, and Cp7 is equal to the first capacitance c1. Control circuit 24 controls all controllable switches S1, S2, and S3 to be off, and the equivalent capacitance of the adjustable capacitor module 22 is at its minimum value. Control circuit 24 controls all controllable switches S1, S2, and S3 to be on, and the equivalent capacitance of the adjustable capacitor module 22 is at its maximum value. Control circuit 24 controls one or more of controllable switches S1, S2, and S3 to be on, which can control the equivalent capacitance of the adjustable capacitor module 22 to change between the minimum and maximum values.

[0073] In this embodiment, the adjustable capacitor module 22 consists of a first capacitor Cp1, at least one series capacitor, and at least one controllable switch, with one series capacitor connected in parallel with one controllable switch. The adjustable capacitor module 22 of the wireless charging module 20 provided in this embodiment withstands low voltage stress, enabling the wireless charging module 20 to be applied to high-voltage, low-current wireless charging scenarios, thereby improving the applicability of the wireless charging module 20.

[0074] The electronic device 10 provided in this application embodiment can be applied to different scenarios. It can serve as a wireless charging transmitter, a wireless charging receiver, or simultaneously possess the functions of both. The structure and function of the wireless charging module 20 will be further described below in conjunction with different application scenarios of the electronic device 10.

[0075] Application Scenario 1:

[0076] Figure 7 This is a schematic diagram illustrating one application scenario of the electronic device provided in this application. For example... Figure 7As shown, electronic device 10 operates as a wireless charging transmitter. The wireless charging module 20 receives DC power Ud2 from DC source 50 and transmits an alternating magnetic field to wireless charging receiver 60. The converter circuit 23 includes an inverter circuit 232. The inverter circuit 232 has at least two operating modes. Exemplarily, the inverter circuit 232 can operate in a fixed-frequency voltage regulation mode and a fixed-voltage frequency regulation mode. In this embodiment, the fixed-frequency voltage regulation mode refers to controlling the operating frequency of the inverter circuit 232 to be fixed at a certain frequency, and adjusting the output power of the inverter circuit 232 by changing the input voltage of the inverter circuit 232. In this embodiment, the fixed-voltage frequency regulation mode refers to controlling the input voltage of the inverter circuit 232 to remain constant, and adjusting the output power of the inverter circuit 232 by changing the operating frequency of the inverter circuit 232.

[0077] In this embodiment, in response to the inverter circuit 232 operating in a fixed-frequency voltage regulation mode, the control circuit 24 controls one or more controllable switches of at least one controllable switch of the adjustable capacitor module 22 to turn off. In response to the inverter circuit 232 operating in a fixed-voltage frequency regulation mode, the control circuit 24 controls all at least one controllable switch of the adjustable capacitor module 22 to turn on. The control circuit 24 is used to determine that the operating mode of the inverter circuit 232 is a fixed-frequency voltage regulation mode, and controls a portion of the controllable switches of at least one controllable switch of the adjustable capacitor module 22 to turn on, while the other portion of controllable switches are turned off. The equivalent capacitance of the adjustable capacitor module 22 is a first capacitance value c1. The resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the inverter circuit 232, and the wireless charging module 20 operates in a charging mode with high charging efficiency and low charging loss. The control circuit 24 is used to determine that the operating mode of the inverter circuit 232 is a fixed-voltage frequency regulation mode, and controls all at least one controllable switch of the adjustable capacitor module 22 to turn on. The equivalent capacitance of the adjustable capacitor module 22 is the second capacitance value c2, and the wireless charging module 20 operates in a conventional constant voltage frequency modulation charging mode. In this embodiment, the inverter circuit 232 is used to receive the DC power Ud2 provided by the DC source 50, convert the DC power Ud2 into the corresponding AC power Ua1, and provide the AC power Ua1 to the charging coil 21. The charging coil 21 and the adjustable capacitor module 22 can be combined to convert the AC power Ua1 into a corresponding alternating magnetic field and transmit the corresponding alternating magnetic field to the wireless charging receiver device 60.

[0078] For example, at least one controllable switch includes a controllable switch S1, and at least one parallel capacitor includes a parallel capacitor Cp2. The value of the first capacitor Cp1 is equal to the first capacitance value c1, and the capacitance value of the first capacitor Cp1 and the parallel capacitor Cp2 connected in series is equal to the second capacitance value c2. The control circuit 24 is used to determine that the inverter circuit 232 is operating in a constant frequency voltage regulation mode and to control the controllable switch S1 to be open. The equivalent capacitance value of the adjustable capacitor module 22 is the first capacitance value c1, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the inverter circuit 232. The control circuit 24 is used to determine that the inverter circuit 232 is operating in a constant voltage frequency regulation mode and to control the controllable switch S1 to be turned on. The equivalent capacitance value of the adjustable capacitor module 22 is the second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of the inverter circuit 232.

[0079] For example, at least one controllable switch includes controllable switch S1, controllable switch S2, and controllable switch S3. At least one parallel circuit includes parallel capacitors Cp2, Cp3, and Cp4. Control circuit 24 determines that inverter circuit 232 operates in fixed-frequency voltage regulation mode and controls one or more of controllable switches S1, S2, and S3 to turn on or off to search for a first capacitance value c1. The control circuit 24 may employ a perturbation-observation method to search for the first capacitance value c1.

[0080] like Figure 5 or Figure 6 As shown, the control circuit 24 continuously reduces the equivalent capacitance value of the adjustable capacitor module 22 by continuously turning on or off one or more of the controllable switches S1, S2, and S3. After each reduction in the equivalent capacitance value of the adjustable capacitor module 22, the wireless power transmission efficiency of the wireless charging module 20 is obtained, and it is determined whether the obtained wireless power transmission efficiency has improved. Specifically, the control circuit 24 can obtain the transmission power of the wireless charging module 20 and the corresponding reception power of the wireless charging receiver device 60, and calculate the wireless power transmission efficiency of the wireless charging module 20 based on the obtained transmission and reception power. If the control circuit 24 determines that the equivalent capacitance value of the adjustable capacitor module 22 is a certain capacitance value, and the wireless power transmission efficiency of the wireless charging module 20 reaches its peak value, then this capacitance value is determined as the first capacitance value c1.

[0081] For example, control circuit 24 controls controllable switch S1 to turn off and controllable switches S2 and S3 to turn on, and obtains the first wireless power transmission efficiency of wireless charging module 20. Further, control circuit 24 controls controllable switches S1 and S2 to turn off and controls controllable switch S3 to turn on to reduce the equivalent capacitance of adjustable capacitor module 22, and obtains the second wireless power transmission efficiency of wireless charging module 20. Further, control circuit 24 determines whether the wireless power transmission efficiency of wireless charging module 20 has improved based on the first and second wireless power transmission efficiencies. If control circuit 24 determines that the second wireless power transmission efficiency has not improved relative to the first wireless power transmission efficiency, then it determines the first capacitance value c1 to be the capacitance value after the first capacitor Cp1 and the parallel capacitor Cp4 are connected in parallel. If the control circuit 24 determines that the second wireless power transmission efficiency is improved relative to the first wireless power transmission efficiency, it will continue to reduce the equivalent capacitance value of the adjustable capacitor module 22 and continue to determine whether the wireless power transmission efficiency of the wireless charging module 20 will improve, until the control circuit 24 determines that reducing the equivalent capacitance value of the adjustable capacitor module 22 will no longer improve the wireless power transmission efficiency of the wireless charging module 20, then it will no longer reduce the equivalent capacitance value of the adjustable capacitor module 22.

[0082] The control circuit 24 is used to determine that the inverter circuit 232 operates in constant voltage frequency modulation mode, and to control all controllable switches S1, S2 and S3 to be turned on. The equivalent capacitance of the adjustable capacitor module 22 is the second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of the inverter circuit 232.

[0083] For example, at least one controllable switch includes a controllable switch S1, and at least one series capacitor includes a series capacitor Cp5. The capacitance of the first capacitor Cp1 and the series capacitor Cp5 connected in series is equal to the first capacitance value c1, and the capacitance of the first capacitor Cp1 is the second capacitance value c2. The control circuit 24 is used to determine that the inverter circuit 232 is operating in a constant frequency voltage regulation mode and to control the controllable switch S1 to be open. The equivalent capacitance of the adjustable capacitor module 22 is the first capacitance value c1, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the inverter circuit 232. The control circuit 24 is used to determine that the inverter circuit 232 is operating in a constant voltage frequency regulation mode and to control the controllable switch S1 to be on. The equivalent capacitance of the adjustable capacitor module 22 is the second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 can be less than the minimum operating frequency of the inverter circuit 232.

[0084] For example, at least one controllable switch includes controllable switch S1, controllable switch S2, and controllable switch S3, and at least one series capacitor includes series capacitor Cp5, series capacitor Cp6, and series capacitor Cp7. Control circuit 24 is used to determine that inverter circuit 232 operates in constant frequency voltage regulation mode, and controls one or more of the controllable switches S1, S2, and S3 to turn on or off to search for a first capacitance value c1 such that the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of inverter circuit 232. For example, control circuit 24 can use a perturbation observation method to search for the first capacitance value c1. Control circuit 24 is used to determine that inverter circuit 232 operates in constant voltage frequency regulation mode, and controls all controllable switches S1, S2, and S3 to turn on. The equivalent capacitance value of adjustable capacitor module 22 is a second capacitance value c2, and the resonant frequency of adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of inverter circuit 232.

[0085] In this embodiment, the wireless charging module 20 adjusts the equivalent capacitance of the adjustable capacitor module 22 according to the operating mode of the inverter circuit 232, so that the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the inverter circuit 232. This allows the wireless charging module 20 to operate in a resonant or near-resonant state with high charging efficiency, thereby reducing charging losses. Alternatively, the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 can be made less than the minimum operating frequency of the inverter circuit 232, enabling it to operate in a biased inductive state under conventional constant voltage frequency modulation charging mode, thus ensuring compatibility with conventional constant voltage frequency modulation charging mode.

[0086] Figure 8 This is yet another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 8 As shown, the inverter circuit 232 includes four switching transistors and one capacitor Cp8. The four switching transistors are T1, T2, T3, and T4. Switches T1 and T3 form the first half-bridge of the inverter circuit 232, with T1 as the upper arm and T3 as the lower arm. Switches T2 and T4 form the second half-bridge of the inverter circuit 232, with T2 as the upper arm and T4 as the lower arm. The capacitor Cp8 is connected in parallel across the first half-bridge. One end of the charging coil 21 is connected to the first half-bridge, and the other end is connected to the second half-bridge.

[0087] In one embodiment, the control circuit 24 is used to determine that the operating mode of the inverter circuit 232 is a fixed-frequency voltage regulation mode, and to fix the drive signals of the switches T1, T2, T3, and T4 at a preset operating frequency. These fixed-frequency drive signals are used to control the upper arm of the first half-bridge and the lower arm of the second half-bridge, as well as the upper arm of the second half-bridge, to alternately conduct or turn off, thereby achieving the inverter function. In one embodiment, the control circuit 24 is also used to control the DC source 50 to provide the DC voltage Ud2 according to the output power required by the wireless charging receiver device 60, thereby adjusting the output power of the inverter circuit 232.

[0088] In one embodiment, the control circuit 24 is used to determine that the operating mode of the inverter circuit 232 is constant voltage frequency modulation mode, keeping the voltage of the DC power Ud2 provided by the DC source 50 constant, and using a variable frequency drive signal to control the upper arm of the first half-bridge, the lower arm of the second half-bridge, and the upper arm of the second half-bridge to alternately conduct or turn off, so as to realize the inverter function. In one embodiment, the control circuit 24 is also used to adjust the frequency of the drive signal of each arm according to the output power required by the wireless charging receiver device 60, so as to adjust the output power of the inverter circuit 232.

[0089] In the embodiments of this application, the switching transistors included in the inverter circuit 232 can specifically be power transistors, power MOSFETs, etc., and this application does not impose specific limitations on the type of switching transistors. In addition, the description of the structure of the inverter circuit 232 is only exemplary, and the inverter circuit 232 can also adopt other possible circuit structures, which this application does not limit.

[0090] Figure 9 This is yet another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 9 As shown, the wireless charging module 20 also includes a DC / DC converter circuit 25. The DC / DC converter circuit 25 is connected to the DC source 50, the inverter circuit 232, and the control circuit 24. The control circuit 24 is also used to control the DC / DC converter circuit 25 to convert the DC power Ud2 provided by the DC source 50 into a DC power Ud4 with the target voltage required by the inverter circuit 232, and to output the DC power Ud4 to the inverter circuit 232. Exemplarily, the DC / DC converter circuit 25 may include an asymmetrical half-bridge (AHB) converter circuit, an active clamp flyback (ACF) converter circuit, a Buck circuit, a Buck-Boost circuit, etc. This application does not specifically limit the type of DC / DC converter circuit 25.

[0091] In this application example, the wireless charging module 20 also includes a DC / DC conversion circuit 25. The wireless charging module 20 converts the DC power Ud2 provided by the DC source 50 into DC power Ud4 with the voltage required by the inverter circuit 232 through the DC / DC conversion circuit 25, which can improve the adaptability of the wireless charging module 20 to the DC source 50.

[0092] Application Scenario 2

[0093] Figure 10 This is a schematic diagram illustrating another application scenario of the electronic device provided in this application. For example... Figure 10 As shown, electronic device 10 operates as a wireless charging receiver. The wireless charging module 20 receives the alternating magnetic field provided by the wireless power supply device 40 and provides DC power Ud1 ​​to the load 30. The converter circuit 23 includes a rectifier circuit 231. The wireless power supply device 40 can operate in a fixed-frequency voltage regulation mode or a fixed-voltage frequency regulation mode. Alternatively, the inverter circuit of the wireless power supply device 40 can operate in a fixed-frequency voltage regulation mode or a fixed-voltage frequency regulation mode.

[0094] In this embodiment, in response to the wireless power supply device 40 operating in a fixed-frequency voltage regulation mode, the control circuit 24 controls one or more controllable switches of at least one controllable switch in the adjustable capacitor module 22 to turn off. In response to the wireless power supply device 40 operating in a fixed-voltage frequency regulation mode, the control circuit 24 controls all at least one controllable switch in the adjustable capacitor module 22 to turn on. In one embodiment, the control circuit 24 is used to determine that the operating mode of the inverter circuit of the wireless power supply device 40 is a fixed-frequency voltage regulation mode, and controls a portion of the controllable switches of at least one controllable switch in the adjustable capacitor module 22 to turn on, and another portion of the controllable switches to turn off. The equivalent capacitance of the adjustable capacitor module 22 is a first capacitance value c1, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the alternating magnetic field provided by the wireless power supply device 40 or a preset frequency. In one embodiment, the control circuit 24 is used to determine that the operating mode of the inverter circuit of the wireless power supply device 40 is a fixed-voltage frequency regulation mode, and controls all at least one controllable switch in the adjustable capacitor module 22 to turn on. The equivalent capacitance of the adjustable capacitor module 22 is the second capacitance value c2. The resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device 40. The charging coil 21 and the adjustable capacitor module 22 can be combined to convert the alternating magnetic field provided by the wireless power supply device 40 into a corresponding AC current Ua1, and output AC current Ua1 to the rectifier circuit 231. The control circuit 24 is used to control the rectifier circuit 231 to convert AC current Ua2 into a corresponding DC current Ud1, and provide DC current Ud1 to the load 30.

[0095] For example, at least one controllable switch includes a controllable switch S1, and at least one parallel capacitor includes a parallel capacitor Cp2. The value of the first capacitor Cp1 is equal to a first capacitance value c1, and the capacitance of the first capacitor Cp1 and the parallel capacitor Cp2 connected in parallel is a second capacitance value c2. The control circuit 24 is used to determine that the wireless power supply device 40 is operating in a fixed-frequency voltage regulation mode and to control the controllable switch S1 to open. The equivalent capacitance value of the adjustable capacitor module 22 is the first capacitance value c1, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the alternating magnetic field provided by the wireless power supply device 40 or a preset frequency. The control circuit 24 is used to determine that the wireless power supply device 40 is operating in a fixed-voltage frequency regulation mode and to control the controllable switch S1 to turn on. The equivalent capacitance value of the adjustable capacitor module 22 is the second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device 40.

[0096] For example, at least one controllable switch includes controllable switch S1, controllable switch S2, and controllable switch S3, and at least one parallel capacitor includes parallel capacitor Cp2, parallel capacitor Cp3, and parallel capacitor Cp4. Control circuit 24 is used to determine when the wireless power supply device 40 is operating in fixed-frequency voltage regulation mode, and to control one or more of the controllable switches S1, S2, and S3 to turn off, in order to search for a first capacitance value c1 such that the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency or a preset frequency of the alternating magnetic field provided by the wireless power supply device 40. The control circuit 24 may use a perturbation observation method to search for the first capacitance value c1.

[0097] like Figure 5 or Figure 6 As shown, the control circuit 24 can continuously reduce the equivalent capacitance value of the adjustable capacitor module 22 by continuously turning one or more of the controllable switches S1, S2, and S3 on or off. After each reduction in the equivalent capacitance value of the adjustable capacitor module 22, the wireless power transmission efficiency of the wireless charging module 20 is obtained, and it is determined whether the obtained wireless power transmission efficiency has improved. Specifically, the control circuit 24 can obtain the transmit power of the wireless power supply device 40 and the receive power of the wireless charging module 20, and calculate the wireless power transmission efficiency based on the transmit and receive power. If the control circuit 24 determines that the equivalent capacitance value of the adjustable capacitor module 22 is a certain capacitance value and the wireless power transmission efficiency of the wireless charging module 20 reaches its peak value, then this capacitance value is determined as the first capacitance value c1.

[0098] For example, control circuit 24 controls controllable switch S1 to turn off, and controllable switches S2 and S3 to turn on, and obtains the first wireless power transmission efficiency of wireless charging module 20. Further, control circuit 24 controls controllable switches S1 and S2 to turn off, and controls controllable switch S3 to turn on to reduce the equivalent capacitance of adjustable capacitor module 22, and obtains the second wireless power transmission efficiency of wireless charging module 20. Further, control circuit 24 determines whether the wireless power transmission efficiency of wireless charging module 20 has improved based on the first and second wireless power transmission efficiencies. If control circuit 24 determines that the second wireless power transmission efficiency has not improved relative to the first wireless power transmission efficiency, then it determines the first capacitance value c1 to be the capacitance value of the first capacitor Cp1 connected in parallel with the parallel capacitor Cp4. If the control circuit 24 determines that the second wireless power transmission efficiency is improved compared to the first wireless power transmission efficiency, it will continue to reduce the equivalent capacitance value of the adjustable capacitor module 22 and continue to determine whether the wireless power transmission efficiency of the wireless charging module 20 is improved, until the control circuit 24 determines that the equivalent capacitance value of the adjustable capacitor module 22 is reduced. If the wireless power transmission efficiency of the wireless charging module 20 is no longer improved, the equivalent capacitance value of the adjustable capacitor module 22 will no longer be reduced.

[0099] The control circuit 24 is used to determine when the wireless power supply device 40 is operating in constant voltage frequency modulation mode, and to control all controllable switches S1, S2 and S3 to be turned on. The equivalent capacitance of the adjustable capacitor module 22 is the second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device 40.

[0100] For example, at least one controllable switch includes a controllable switch S1, and at least one series capacitor includes a series capacitor Cp5. The capacitance of the first capacitor Cp1 and the series capacitor Cp5 connected in series is equal to the first capacitance value c1, and the capacitance of the first capacitor Cp1 is the second capacitance value c2. The control circuit 24 is used to determine that the wireless power supply device 40 is operating in a fixed-frequency voltage regulation mode and to control the controllable switch S1 to open. The equivalent capacitance of the adjustable capacitor module 22 is the first capacitance value c1, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the alternating magnetic field provided by the wireless power supply device 40 or a preset frequency. The control circuit 24 is used to determine that the wireless power supply device 40 is operating in a fixed-voltage frequency regulation mode and to control the controllable switch S1 to turn on. The equivalent capacitance of the adjustable capacitor module 22 is the second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device 40.

[0101] For example, at least one controllable switch includes controllable switch S1, controllable switch S2, and controllable switch S3, and at least one series capacitor includes series capacitor Cp5, series capacitor Cp6, and series capacitor Cp7. Control circuit 24 is used to determine that the wireless power supply device 40 is operating in a fixed-frequency voltage regulation mode, and to control one or more of the controllable switches S1, S2, and S3 to be turned on or off, in order to search for a first capacitance value c1 such that the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the operating frequency of the alternating magnetic field provided by the wireless power supply device 40 or a preset frequency. Control circuit 24 is used to determine that the wireless power supply device 40 is operating in a fixed-voltage frequency regulation mode, and to control all of these controllable switches to be turned on. The equivalent capacitance value of the adjustable capacitor module 22 is a second capacitance value c2, and the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 can be less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device 40.

[0102] In this embodiment, the wireless charging module 20 adjusts the equivalent capacitance of the adjustable capacitor module 22 according to the working mode of the wireless power supply device 40, so that the resonant frequency of the adjustable capacitor module 22 and the charging coil 21 is equal to the working frequency of the alternating magnetic field provided by the wireless power supply device 40, or less than the minimum working frequency of the alternating magnetic field provided by the wireless power supply device 40. This allows the wireless charging module 20 to work in a resonant or near-resonant state with high charging efficiency, as well as in a biased inductive state under the conventional constant voltage frequency modulation charging mode.

[0103] In one embodiment, the rectifier circuit 231 is a bridge rectifier circuit. The control circuit 24 is further configured to control the rectifier circuit 231 to operate in a half-bridge voltage doubler rectification mode or a full-bridge rectification mode based on the induced voltage of the charging coil 21. Specifically, in response to the induced voltage of the charging coil 21 being less than or equal to a preset voltage, the control circuit 24 controls the rectifier circuit 231 to operate in a half-bridge voltage doubler rectification mode, which allows the DC voltage Ud1 output by the rectifier circuit 231 to be greater than the induced voltage of the charging coil 21, thereby achieving boost rectification. In response to the induced voltage of the charging coil 21 being greater than the preset voltage, the control circuit 24 controls the rectifier circuit 231 to operate in a full-bridge rectification mode, which allows the DC voltage Ud1 output by the rectifier circuit 231 to be maintained at the magnitude of the induced voltage of the charging coil 21, thereby achieving 1x voltage rectification.

[0104] In this embodiment, the control circuit 24 is also used to control the rectifier circuit 231 to operate in half-bridge voltage doubler rectification mode or full-bridge rectification mode according to the induced voltage of the charging coil 21, thereby controlling the magnitude of the DC power Ud1 ​​provided by the rectifier circuit 231 to the load 30. This can improve the adaptability of the wireless charging module 20 to the load 30 and the wireless power supply device 40.

[0105] Figure 11 This is another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 11 As shown, rectifier circuit 231 is a full-bridge controllable rectifier circuit. Rectifier circuit 231 may include four switching transistors: T5, T6, T7, and T8. Switches T5 and T6 form the first half-bridge of rectifier circuit 231, with T5 as the upper arm and T6 as the lower arm. Switches T7 and T8 form the second half-bridge of rectifier circuit 231, with T7 as the upper arm and T8 as the lower arm. One end of the wireless charging coil 21 is connected to the first half-bridge, and the other end is connected to the second half-bridge. The control terminals of switches T5, T6, T7, and T8 are connected to control circuit 24.

[0106] In this embodiment, the control circuit 24 determines that the induced voltage of the charging coil 21 is less than or equal to a preset voltage, and controls the upper and lower arms of the first half-bridge of the rectifier circuit 231 to alternately turn on or off, and controls the upper arm of the second half-bridge of the rectifier circuit 231 to turn on and the lower arm to turn off, or vice versa, thereby enabling the rectifier circuit 231 to operate in a half-bridge voltage multiplier rectification mode. For example, the control circuit 24 controls switch T5 to turn on and switch T6 to turn off at time t1, and controls switch T5 to turn off and switch T6 to turn on at time t2 after time t1, alternating in this manner. Simultaneously, it controls switch T7 to remain on and switch T8 to remain off, thus enabling the rectifier circuit 231 to operate in a half-bridge voltage multiplier rectification mode. The control circuit 24 determines that the induced voltage of the charging coil 21 is greater than a preset voltage, and controls the upper arm of the first half-bridge and the lower arm of the second half-bridge of the rectifier circuit 231 to alternately turn on or off, so that the rectifier circuit 231 operates in full-bridge rectification mode. For example, the control circuit 24 controls switches T5 and T8 to turn on and switches T6 and T7 to turn off at time t1, and controls switches T5 and T8 to turn off and switches T6 and T7 to turn on at time t2 after time t1, alternating in this manner, thus enabling the rectifier circuit 231 to operate in full-bridge rectification mode.

[0107] In this embodiment, the rectifier circuit 231 can also be a bridge half-controlled or single-arm controllable rectifier circuit, and two or three arms of the rectifier circuit 231 can be composed of uncontrollable diodes. The control circuit 24 is used to control the switching transistors of the remaining arms to make the rectifier circuit 231 operate in half-bridge voltage doubler rectification mode or full-bridge rectification mode.

[0108] In this embodiment, the switching transistor of the rectifier circuit 231 can be a turn-off thyristor, a power transistor, a power MOSFET, etc. This application does not impose specific restrictions on the type of switching transistor.

[0109] In this embodiment, the rectifier circuit 231 of the wireless charging module 20 is a full-bridge controllable rectifier circuit or a half-bridge controllable rectifier circuit, which reduces the complexity of its structure and control.

[0110] Figure 12 This is another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 12 As shown, the wireless charging module 20 also includes a DC / DC converter circuit 26. The DC / DC converter circuit 26 is connected to the rectifier circuit 231, the load 30, and the control circuit 24. The control circuit 24 controls the DC / DC converter circuit 26 to convert the DC current Ud1 output from the rectifier circuit 231 into a DC current Ud3 with a preset target voltage, and outputs the DC current Ud3 to the load 30. For example, the DC / DC converter circuit 26 may include an asymmetrical half-bridge (AHB) converter circuit, an active clamp flyback (ACF) converter circuit, a Buck circuit, a Buck-Boost circuit, etc. This application does not specifically limit the type of DC / DC converter circuit 26.

[0111] In this embodiment, the wireless charging module 20 also includes a DC / DC conversion circuit 26. The wireless charging module 20 converts the DC power Ud1 ​​output by the rectifier circuit 231 into a DC power Ud3 with a preset voltage through the DC / DC conversion circuit 26. This can further expand the adjustment range of the output voltage of the wireless charging module 20, thereby improving the adaptability of the wireless charging module 20 to the load 30.

[0112] Application Scenario 3

[0113] The electronic device 10 can function as either a wireless charging receiver or a wireless charging transmitter, and its operating mode can be controlled according to actual needs. Figure 13 This is another structural schematic diagram of the wireless charging module provided in this application. For example... Figure 13As shown, the converter circuit 23 of the wireless charging module 20 includes a rectifier circuit 231 and an inverter circuit 232. When the electronic device 10 operates as a wireless charging receiver, the control circuit 24 can activate the rectifier circuit 231. With the control circuit 24 activating the rectifier circuit 231, the structure and function of the wireless charging module 20 are the same as those described in application scenario two. To avoid repetition, this will not be repeated here. Similarly, when the electronic device 10 operates as a wireless charging transmitter, the control circuit 24 can activate the inverter circuit 232. With the control circuit 24 activating the inverter circuit 232, the specific structure and function of the wireless charging module 20 are the same as those described in application scenario one. To avoid repetition, this will not be repeated here.

[0114] In this embodiment, the controllable switch included in the wireless charging module 20 can be a mechanical switch, a controllable switching transistor, or other electronic devices that can be controlled to be turned on or off by the control circuit 24. This application does not limit the specific type of controllable switch. For example, the controllable switching transistor can be a turn-off thyristor, a power transistor, a power MOSFET, etc.

[0115] In the embodiments of this application, the control circuit 24 can be any type of device with data processing and control functions, such as CPU, general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, transistor logic devices, hardware components or any combination thereof.

[0116] In the embodiments of this application, different feasible implementations can be combined with each other. For example, combining Figure 8 The implementation scheme of the described inverter circuit 232 and Figure 9 The wireless charging module 20 shown can be implemented in various ways. For example, Figure 11 The description of rectifier circuit 231 can also be compared with... Figure 12 or Figure 13 The wireless charging module 20 shown is implemented in various ways. These different combinations of implementations should also be considered within the scope of protection of this application.

[0117] This application embodiment also provides a control circuit. This control circuit is applicable to a wireless charging module 20 operating as a wireless charging transmitter device in a scenario where the electronic device 10 is used. It can be a control circuit 24. This control circuit is used to control the coordinated operation of the various functional units of the wireless charging module 20, enabling the wireless charging module 20 to receive direct current and emit an alternating magnetic field.

[0118] This application embodiment also provides a control circuit. This control circuit is applicable to a wireless charging module 20 operating as a wireless charging receiver in a scenario where the electronic device 10 functions as such, and it can be a control circuit 24. This control circuit controls the coordinated operation of the various functional units of the wireless charging module 20, enabling the wireless charging module 20 to receive alternating magnetic fields and output direct current.

[0119] This application embodiment also provides a control circuit applicable to wireless charging modules 20 in scenarios where the electronic device 10 can function as both a wireless charging receiver and a wireless charging transmitter. This control circuit can be a control circuit 24. The control circuit controls the coordinated operation of the various functional units of the wireless charging module 20, enabling the wireless charging module 20 to receive alternating magnetic fields and output direct current, or to receive direct current and emit alternating magnetic fields.

[0120] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, or methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0121] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0122] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solution of this application should be included within the scope of protection of this application.

Claims

1. A wireless charging module, characterized in that, The device includes a control circuit, a charging coil, an adjustable capacitor module, and a converter circuit. The converter circuit includes at least one of a rectifier circuit or an inverter circuit. The adjustable capacitor module is connected in series between the charging coil and the converter circuit. The adjustable capacitor module includes multiple capacitors and at least one controllable switch. The control circuit is used to control the at least one controllable switch to be turned on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module. The equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value. In response to the wireless charging module operating in a fixed-frequency voltage regulation mode, the control circuit controls one or more of the controllable switches of the adjustable capacitor module to turn off. In response to the wireless power supply device powering the wireless charging module operating in constant voltage frequency modulation mode, the control circuit controls all at least one controllable switch to be turned on. Wherein, when the converter circuit includes an inverter circuit, the control circuit controls one or more of the at least one controllable switches to turn off, such that the resonant frequency of the adjustable capacitor module and the charging coil is equal to the operating frequency of the inverter circuit; or, the control circuit controls all at least one controllable switch to turn on, such that the resonant frequency of the adjustable capacitor module and the charging coil is less than the minimum operating frequency of the inverter circuit. Alternatively, if the converter circuit includes a rectifier circuit, the control circuit controls one or more of the at least one controllable switches of the adjustable capacitor module to turn off, such that the resonant frequency of the adjustable capacitor module and the charging coil is equal to a preset frequency or the operating frequency of the alternating magnetic field provided by the wireless power supply device. Or, the control circuit controls all at least one controllable switch to turn on, such that the resonant frequency of the adjustable capacitor module and the charging coil is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device. The charging coil is used to receive the alternating magnetic field generated by the wireless power supply device and output AC power.

2. The wireless charging module according to claim 1, characterized in that, The adjustable capacitor module includes a first capacitor, at least one parallel capacitor, and at least one controllable switch. The first capacitor is connected in series between the charging coil and the converter circuit. The at least one parallel capacitor is connected in parallel with the first capacitor through at least one controllable switch, wherein: In response to the shutdown of one or more of the at least one controllable switch, the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance. In response to all of the at least one controllable switch being turned on, the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance.

3. The wireless charging module according to claim 1, characterized in that, The adjustable capacitor module includes a first capacitor, at least one series capacitor, and at least one controllable switch. The first capacitor and the at least one series capacitor are connected in series between the charging coil and the converter circuit. The at least one controllable switch is connected in parallel with each of the at least one series capacitors. In response to the shutdown of one or more of the at least one controllable switch, the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance. In response to all of the at least one controllable switch being turned on, the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance.

4. The wireless charging module according to any one of claims 1-3, characterized in that, The wireless charging module generates an alternating magnetic field, the inverter circuit converts direct current (DC) to alternating current (AC), and the charging coil receives the AC and generates the alternating magnetic field. The inverter circuit operates in either a constant frequency voltage regulation mode or a constant voltage frequency regulation mode, wherein: In response to the inverter circuit operating in a fixed-frequency voltage regulation mode, the control circuit controls one or more of the controllable switches of the adjustable capacitor module to turn off. In response to the inverter circuit operating in constant voltage frequency modulation mode, the control circuit controls all the controllable switches of the adjustable capacitor module to be turned on.

5. The wireless charging module according to any one of claims 1-3, characterized in that, The wireless charging module is used to receive an alternating magnetic field, the charging coil is used to receive the alternating magnetic field generated by the wireless power supply device and output AC power, and the rectifier circuit is used to convert the AC power into DC power, wherein: In response to the wireless power supply device operating in a constant frequency voltage regulation mode, the control circuit controls one or more of the at least one controllable switches to turn off; or, in response to the wireless power supply device operating in a constant voltage frequency regulation mode, the control circuit controls all of the at least one controllable switches to turn on. The control circuit is also used to control the rectifier circuit to operate in half-bridge voltage doubler rectification mode or full-bridge rectification mode according to the induced voltage of the charging coil.

6. The control circuit according to claim 5, characterized in that, The rectifier circuit includes a first half-bridge and a second half-bridge connected in parallel, and the control circuit is used for: In response to the induced voltage of the charging coil being less than or equal to a preset voltage, the control causes the upper and lower arms of the first half-bridge to alternately turn on or off, and the upper arm of the second half-bridge to turn on and the lower arm to turn off, or the upper arm of the second half-bridge to turn off and the lower arm to turn on, so that the rectifier circuit operates in the half-bridge voltage multiplier rectification mode. In response to the induced voltage of the charging coil being greater than the preset voltage, the upper arm of the first half-bridge and the lower arm of the second half-bridge, and the lower arm of the first half-bridge and the upper arm of the second half-bridge, are controlled to alternately turn on or off, so that the rectifier circuit operates in the full-bridge rectification mode.

7. A control circuit for a wireless charging module, characterized in that, The wireless charging module includes a control circuit, a charging coil, an adjustable capacitor module, and an inverter circuit. The adjustable capacitor module is connected in series between the charging coil and the inverter circuit. The adjustable capacitor module includes multiple capacitors and at least one controllable switch. The control circuit is used to control the at least one controllable switch to turn on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module. The equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value. The control circuit is used to control the operation of the inverter circuit in a fixed-frequency voltage regulation mode or a fixed-voltage frequency regulation mode, and is used for: In response to the inverter circuit operating in a fixed-frequency voltage regulation mode, the equivalent capacitance value of the adjustable capacitor module is controlled to be equal to the first capacitance value. In response to the inverter circuit operating in constant voltage frequency modulation mode, the equivalent capacitance value of the adjustable capacitor module is controlled to be equal to the second capacitance value; The control circuit controls one or more of the at least one controllable switches to turn off, such that the resonant frequency of the adjustable capacitor module and the charging coil is equal to the operating frequency of the inverter circuit; or, the control circuit controls all at least one controllable switch to turn on, such that the resonant frequency of the adjustable capacitor module and the charging coil is less than the minimum operating frequency of the inverter circuit.

8. The control circuit according to claim 7, characterized in that, The adjustable capacitor module includes a first capacitor, at least one parallel capacitor, and at least one controllable switch. The first capacitor is connected in series between the charging coil and the converter circuit. The at least one parallel capacitor is connected in parallel with the first capacitor through at least one controllable switch, wherein: The control circuit controls the at least one or more controllable switches to turn off, so that the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance. The control circuit controls all at least one controllable switch to be turned on, so that the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance.

9. The control circuit according to claim 7, characterized in that, The adjustable capacitor module includes a first capacitor, at least one series capacitor, and at least one controllable switch. The first capacitor and the at least one series capacitor are connected in series between the charging coil and the converter circuit. The at least one controllable switch is connected in parallel with each of the at least one series capacitors. The control circuit controls the at least one or more controllable switches to turn off, so that the equivalent capacitance of the adjustable capacitor module is equal to the first capacitance. The control circuit controls all at least one controllable switch to be turned on, so that the equivalent capacitance of the adjustable capacitor module is equal to the second capacitance.

10. A control circuit for a wireless charging module, characterized in that, A wireless charging module is used to receive an alternating magnetic field provided by a wireless power supply device. The wireless charging module includes a control circuit, a charging coil, an adjustable capacitor module, and a rectifier circuit. The charging coil receives the alternating magnetic field. The adjustable capacitor module is connected in series between the charging coil and the rectifier circuit. The adjustable capacitor module includes multiple capacitors and at least one controllable switch. The control circuit controls the at least one controllable switch to turn on or off, thereby controlling the equivalent capacitance value of the adjustable capacitor module. The equivalent capacitance value of the adjustable capacitor module includes at least a first capacitance value and a second capacitance value. The control circuit is used to: In response to the wireless power supply device operating in a fixed-frequency voltage regulation mode, the equivalent capacitance value of the adjustable capacitor module is controlled to be equal to the first capacitance value; or, in response to the wireless power supply device operating in a fixed-voltage frequency regulation mode, the equivalent capacitance value of the adjustable capacitor module is controlled to be equal to or less than the second capacitance value and greater than the first capacitance value. The rectifier circuit is controlled to operate in half-bridge voltage doubler rectification mode or full-bridge rectification mode based on the induced voltage of the charging coil. The control circuit controls one or more of the at least one controllable switches of the adjustable capacitor module to turn off, such that the resonant frequency of the adjustable capacitor module and the charging coil is equal to a preset frequency or the operating frequency of the alternating magnetic field provided by the wireless power supply device; or, the control circuit controls all at least one controllable switch to turn on, such that the resonant frequency of the adjustable capacitor module and the charging coil is less than the minimum operating frequency of the alternating magnetic field provided by the wireless power supply device.

11. The control circuit according to claim 10, characterized in that, The control circuit is used for: In response to the induced voltage of the charging coil being less than or equal to a preset voltage, the rectifier circuit is controlled to operate in the half-bridge voltage doubler rectification mode; In response to the induced voltage of the charging coil being greater than a preset voltage, the rectifier circuit is controlled to operate in the full-bridge rectification mode.

12. The control circuit according to claim 11, characterized in that, The rectifier circuit includes a first half-bridge and a second half-bridge connected in parallel, and the control circuit is used for: The control causes the upper and lower arms of the first half-bridge to be alternately turned on or off, and the upper arm of the second half-bridge to be turned on and the lower arm to be turned off, or the upper arm of the second half-bridge to be turned off and the lower arm to be turned on, so that the rectifier circuit operates in the half-bridge voltage multiplier rectifier mode. Alternatively, the control can cause the upper arm of the first half-bridge and the lower arm of the second half-bridge to be alternately turned on or off, so that the rectifier circuit operates in the full-bridge rectification mode.

13. An electronic device, characterized in that, The electronic device includes a wireless charging module as described in any one of claims 1-6 or a control circuit for a wireless charging module as described in any one of claims 7-12.

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