Wireless charging receiver, electronic device, and wireless charging system

Abstract

The embodiment of the present application provides a wireless charging receiving device, an electronic device and a wireless charging system, the wireless charging receiving device comprises: a first receiving circuit and a second receiving circuit which are arranged in parallel, and the first receiving circuit and the second receiving circuit are used for charging a load; the first receiving circuit comprises a first series resonant circuit, a capacitor circuit and a first rectifier; the first output end and the second output end of the first series resonant circuit are coupled to the first input end and the second input end of the first rectifier respectively; the capacitor circuit comprises a plurality of capacitor branches, the plurality of capacitor branches are coupled in parallel between the first output end and the second output end of the first series resonant circuit, and each capacitor branch in the plurality of capacitor branches comprises at least one capacitor and at least one switch, and the wireless charging receiving device provided by the present application can realize the output of high-power electric energy by using fewer devices.

Description

Technical Field

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

[0002] With the development of electronic technology, the performance of mobile devices has been continuously improved. More and more users prefer to use mobile devices to complete various tasks, which leads to excessive power consumption and the need for timely charging. To improve the convenience of charging mobile devices, wireless charging technology has emerged and is widely used. When using wireless charging technology to charge mobile devices, there is no need to connect the mobile device to the power adapter through wires; simply place the mobile device on the charging base to complete the charging process.

[0003] In wireless charging technology, electromagnetic coupling is typically used to transfer electrical energy from the coil in the charging base to the coil in the mobile device, thus charging the device. To achieve high-power output, the industry has proposed setting up multiple independent charging systems at both the power transmitter and receiver. This results in high costs for wireless charging devices, making mass production difficult. Consequently, current technology has not yet solved the problem of low output power in charging devices. Summary of the Invention

[0004] By employing the wireless charging receiver, electronic device, and wireless charging system shown in this application, high-power electrical energy output can be achieved using fewer components.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, embodiments of this application provide a wireless charging receiving device, which includes a first receiving circuit and a second receiving circuit connected in parallel, the first receiving circuit and the second receiving circuit being used to charge a load; the first receiving circuit includes a first series resonant circuit, a capacitor circuit and a first rectifier; the first output terminal and the second output terminal of the first series resonant circuit are respectively coupled to the first input terminal and the second input terminal of the first rectifier; the capacitor circuit includes a plurality of capacitor branches, the plurality of capacitor branches being coupled in parallel between the first output terminal and the second output terminal of the first series resonant circuit, each of the plurality of capacitor branches including at least one capacitor and at least one switch, the at least one capacitor being coupled between the first output terminal and the second output terminal of the first series resonant circuit through the at least one switch; the second receiving circuit includes a second series resonant circuit and a second rectifier; the first output terminal and the second output terminal of the second series resonant circuit are respectively coupled to the first input terminal and the second input terminal of the second rectifier.

[0007] The first receiving circuit and the second receiving circuit described in the embodiments of this application can be, for example, as follows: Figure 4 The receiving circuits 022 and 021 shown; the first series resonant circuit, capacitor circuit, and first rectifier described in the embodiments of this application can, for example, be respectively Figure 4 The series resonant circuit LC2, capacitor circuit 4, and rectifier R2 described in the present application; the second series resonant circuit and the second rectifier described in the embodiments of this application may be, for example, the series resonant circuit LC1 and the rectifier R1 respectively.

[0008] The wireless charging receiver device shown in this embodiment can achieve output current adjustment and high current output without changing the existing structure of the transmitter or by adding only a small number of coils to the transmitter. Only a small number of capacitors and switches are needed in the first receiving circuit. Compared with traditional wireless charging technology, it can simplify circuit design and reduce the production cost of wireless charging system.

[0009] Based on the first aspect, in one possible implementation, each of the plurality of capacitor branches includes a first capacitor and a first switch; a first terminal of the first capacitor is coupled to a first output terminal of the first series resonant circuit, a second terminal of the first capacitor is coupled to a first terminal of the first switch, and a second terminal of the first switch is coupled to a second output terminal of the first series resonant circuit. In this possible implementation, the first rectifier is a half-wave rectifier.

[0010] Based on the first aspect, in one possible implementation, each of the plurality of capacitor branches includes a first capacitor, a second capacitor, a first switch, and a second switch; a first terminal of the first capacitor is coupled to a first output terminal of the first series resonant circuit, a second terminal of the first capacitor is coupled to a first terminal of the first switch, and a second terminal of the first switch is coupled to a common ground; a first terminal of the second capacitor is coupled to a second output terminal of the first series resonant circuit, a second terminal of the second capacitor is coupled to a first terminal of the second switch, and a second terminal of the second switch is coupled to a common ground. In this possible implementation, the first rectifier is a full-wave rectifier.

[0011] Based on the first aspect, in one possible implementation, the first series resonant circuit includes a first coil and a third capacitor; a first end of the first coil is coupled to a first input terminal of the first rectifier through the third capacitor; and a second end of the first coil is coupled to a second input terminal of the first rectifier.

[0012] Based on the first aspect, in one possible implementation, the second series resonant circuit includes a second coil and a fourth capacitor; a first end of the second coil is coupled to a first input terminal of the second rectifier through the fourth capacitor; and a second end of the second coil is coupled to a second input terminal of the second rectifier.

[0013] Based on the first aspect, in one possible implementation, the wireless charging device further includes a receiver controller; the receiver controller is used to acquire the output electrical parameters of the first receiving circuit and the second receiving circuit, and based on the electrical parameters, control the switch in the capacitor circuit to be turned on or off; the electrical parameters include at least one of the following: voltage, current and power.

[0014] This application embodiment uses a receiver controller to control the switching on or off of the switch in the capacitor circuit, so that the magnitude of the current output by the first receiving circuit can be controlled by the controller. This decouples the communication between the first receiving circuit and the transmitter in the wireless charging system. Changes in the output power of the first receiving circuit do not require control by the transmitter. When the load power consumption is too high and the output voltage drops, it can quickly respond to output current to the output terminal, thereby improving the reliability of the electronic device.

[0015] Based on the first aspect, in one possible implementation, the receiver controller is configured to: detect the current battery level of the electronic device, and when the current battery level of the electronic device is lower than a first preset threshold, control the switch in the capacitor circuit to turn off.

[0016] Based on the first aspect, in one possible implementation, the receiver controller is further configured to: detect whether the current output by the second receiving circuit reaches a preset current value when the current power of the electronic device is greater than or equal to a first preset threshold and less than a second preset threshold; and control at least some switches in the capacitor circuit to be turned on when the current output by the second receiving circuit reaches the preset current value.

[0017] Based on the first aspect, in one possible implementation, the receiver controller is further configured to: control the switch in the capacitor circuit to turn off when the current battery level of the electronic device is greater than or equal to a second preset threshold.

[0018] Based on the first aspect, in one possible implementation, the receiver controller is further configured to: in response to detecting a first instruction sent by a user, control the second receiving circuit to transmit a first electromagnetic induction signal to the wireless charging transmitter, wherein the first instruction is used to indicate charging in a fast charging mode, and the first electromagnetic induction signal is used to indicate charging in a fast charging mode. In response to detecting a second instruction sent by a user, control the second receiving circuit to transmit a second electromagnetic induction signal to the wireless charging transmitter, wherein the second instruction is used to indicate charging in a slow charging mode, and the second electromagnetic induction signal is used to indicate charging in a slow charging mode.

[0019] Based on the first aspect, in one possible implementation, the receiver controller is further configured to: when the current output by the second receiving circuit does not reach a preset current value, control the second receiving circuit to transmit a third electromagnetic induction signal to the wireless charging transmitter, the third electromagnetic induction signal being used to instruct the wireless charging transmitter to increase or decrease the induced current.

[0020] Based on the first aspect, in one possible implementation, the first receiving circuit further includes a first DC-DC conversion circuit; the first DC-DC conversion circuit is used to convert the first voltage output by the first rectifier to generate a second voltage and provide it to the output terminal of the first receiving circuit.

[0021] Based on the first aspect, in one possible implementation, the second receiving circuit further includes a second DC-DC conversion circuit; the second DC-DC conversion circuit is used to convert the third voltage output by the second rectifier to generate a fourth voltage and provide it to the output terminal of the second receiving circuit.

[0022] By incorporating a DC-DC conversion circuit, the output voltage of the wireless charging receiver can be made more stable and flexibly adjustable. This DC-DC conversion circuit can include, but is not limited to, voltage conversion circuits such as buck converters, boost converters, or boost-buck converters. For example, in a specific scenario, reducing the output voltage of the first and second rectifiers can reduce the induced current supplied to the transmitter, thereby reducing power loss. However, reducing the output voltage of the first and second rectifiers might lead to insufficient voltage supplied to the load, causing abnormal load operation. By incorporating a DC-DC conversion circuit, the output voltage of the first and second rectifiers can be further boosted, improving power supply stability and thus contributing to stable load operation.

[0023] In a second aspect, embodiments of this application provide an electronic device, which includes a load and a wireless charging receiving device as described in the first aspect; the output terminals of a first receiving circuit and a second receiving circuit in the wireless charging receiving device are coupled to the load; the first receiving circuit and the second receiving circuit are used to charge the load.

[0024] Thirdly, embodiments of this application provide a wireless charging system, which includes a wireless charging transmitter and a wireless charging receiver as described in the first aspect; the wireless charging transmitter is used to output an induced current to the wireless charging receiver.

[0025] Based on the third aspect, in one possible implementation, the wireless charging transmitting device includes at least one coil; the at least one coil is coupled to a first coil and a second coil in the wireless charging receiving device.

[0026] Based on the third aspect, in one possible implementation, the wireless charging transmitter further includes an inverter circuit, the wireless charging transmitter including a third coil and a fourth coil, the third coil and the fourth coil being connected in parallel at the output terminal of the inverter circuit.

[0027] Based on the third aspect, in one possible implementation, the wireless charging transmitter further includes a third switch and a fourth switch; the third coil is coupled to the output terminal of the inverter circuit through the third switch; the fourth coil is coupled to the output terminal of the inverter circuit through the fourth switch; the wireless charging transmitter further includes a transmitter controller, which is used to detect the electrical parameters of the third coil and the fourth coil, and control the third switch and the fourth switch to be turned on or off according to the electrical parameters of the third coil and the fourth coil;

[0028] The electrical parameters of the third coil and the fourth coil include at least one of the following: voltage, current, or power.

[0029] Based on the third aspect, in one possible implementation, the transmitter controller is configured to: periodically control the third switch to be turned on or off; and when the third switch is turned on, maintain the third switch in the on state in response to detecting an induced current from the third coil.

[0030] Based on the third aspect, in one possible implementation, the transmitter controller is configured to: periodically control the fourth switch to be turned on or off; when the fourth switch is turned on, in response to detecting an induced current from the fourth coil, maintain the fourth switch in the on state.

[0031] Based on the third aspect, in one possible implementation, the transmitter controller is further configured to: receive a first electromagnetic induction signal from the wireless charging receiver, the first electromagnetic induction signal being used to indicate charging in a fast charging mode; and control the third switch and the fourth switch to close based on the first electromagnetic induction signal.

[0032] Based on the third aspect, in one possible implementation, the transmitter controller is further configured to: receive a second electromagnetic induction signal from the wireless charging receiver, the second electromagnetic induction signal being used to indicate charging in a slow charging mode; and based on the second electromagnetic induction signal, control one of the third and fourth switches to close.

[0033] It should be understood that the second and third aspects of this application are consistent with the technical solutions of the first aspect of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, so they will not be described again. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram illustrating an application scenario of the wireless charging system provided in this application embodiment;

[0036] Figures 2A-2D , Figure 2G This is yet another schematic diagram illustrating an application scenario of the wireless charging system provided in this application embodiment;

[0037] Figures 2E-2F , Figure 2H This is a schematic diagram of a wireless charging management interface presented in a mobile phone according to an embodiment of this application;

[0038] Figure 3 This is a schematic diagram of the wireless charging system provided in this application being connected to other components;

[0039] Figure 4 This is a schematic diagram of a wireless charging system provided in an embodiment of this application;

[0040] Figure 5 This is an equivalent circuit diagram of the transmitter and receiver circuit 022 coupled together according to an embodiment of this application;

[0041] Figures 6A-6CThis is an output voltage-capacitance characteristic curve provided in an embodiment of this application;

[0042] Figure 7 This is a schematic diagram of the receiving circuit 022 provided in an embodiment of this application;

[0043] Figure 8 This is another structural schematic diagram of the wireless charging system provided in the embodiments of this application;

[0044] Figure 9 The embodiments provided in this application are as follows Figure 8 The waveform diagrams of each port in the wireless charging system are shown below.

[0045] Figure 10 This is yet another structural schematic diagram of the receiving circuit 022 provided in the embodiments of this application;

[0046] Figure 11 This application provides embodiments for controlling, such as Figure 10 The control timing of the receiving circuit 022 is shown, along with the output voltage and current waveforms of the output terminal o2 under various states.

[0047] Figure 12A This is yet another structural schematic diagram of the receiving circuit 022 provided in the embodiments of this application;

[0048] Figure 12B This is yet another structural schematic diagram of the receiving circuit 022 provided in the embodiments of this application;

[0049] Figure 13 This is another structural schematic diagram of the receiver 02 provided in the embodiments of this application;

[0050] Figure 14 This is another structural schematic diagram of the receiver 02 provided in the embodiments of this application;

[0051] Figure 15 This is another structural schematic diagram of the wireless charging system provided in the embodiments of this application;

[0052] Figure 16 This is a flowchart of a wireless charging method provided in an embodiment of this application. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] The terms "first," "second," and similar terms used in this article do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one" and similar terms do not indicate a quantity limitation, but rather indicate the existence of at least one. Terms such as "connection" or "coupling" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect, equivalent to connectivity in a broad sense.

[0055] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more. For example, multiple capacitor branches refer to two or more capacitor branches.

[0056] The wireless charging system described in this application can be applied to electronic devices to charge loads such as batteries and electronic components within those devices. These electronic devices may include, but are not limited to, mobile phones, wearable devices, electric toothbrushes, and tablets. The wireless charging system can include a wireless charging transmitter and a wireless charging receiver, where the transmitter can also be referred to as a transmitter end, and the receiver as a receiver end. In this application, the wireless charging transmitter is referred to as the transmitter end, and the receiver as the receiver end. The receiver end can be located within the electronic device, and the transmitter end can be located within a charging base. The transmitter and receiver ends in the wireless charging system can be manufactured and sold independently. For example, the transmitter end and power adapter can be sold as part of a charging base, while the receiver end can be sold as part of an electronic device.

[0057] The following uses a mobile phone as an example to illustrate the application scenarios of the wireless charging system described in this application. Please refer to... Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of the wireless charging system provided in an embodiment of this application. Figure 1The image shows a mobile phone 100 and a charging base 101. The wireless charging system includes a transmitter 01 and a receiver 02. The transmitter 01 is disposed in the charging base 101, and the receiver 02 is disposed in the mobile phone 100. The transmitter 01 includes coils L11 and L12, and the receiver 02 includes coils L21 and L22. Preferably, coils L11 and L12 are connected in parallel in the same plane of the charging base 101, and coils L21 and L22 are connected in parallel in the same plane of the mobile phone 100. In operation, based on the principle of electromagnetic induction, the transmitter 01 provides an induced current to the receiver 02 through at least one of coils L11 and L12. The receiver 02 supplies power to the load in the mobile phone based on the induced current received by at least one of coils L21 and L22.

[0058] based on Figure 1 As shown in the scenario, in this embodiment of the application, multiple charging modes can be used to charge the mobile phone, such as fast charging mode and slow charging mode. This embodiment of the application provides multiple methods for switching between fast charging mode and slow charging mode. The methods for switching between fast charging mode and slow charging mode are described below.

[0059] In the first possible implementation, the fast charging mode and slow charging mode can be switched by adjusting the relative positions of the coil in the transmitter 01 and the coil in the receiver 02. In practice, the user can adjust the relative positions of the mobile phone 100 and the charging base 101 to adjust the relative positions of the coil in the transmitter 01 and the coil in the receiver 02. When the user places the mobile phone 100 vertically on the charging base 101, that is, when the long side of the mobile phone 100 and the long side of the charging base 101 extend in the same direction, such as... Figure 2A As shown, the phone is being charged using fast charging mode. Figure 2A In the scenario shown, coil L11 in charging base 101 is coupled to coil L21 in the mobile phone, and coil L12 in charging base 101 is coupled to coil L22 in the mobile phone. Figure 2B As shown. In Figure 2B In the process, coils L11 and L12 provide induced current to coils L21 and L22 respectively, and receiver 02 charges the load in the mobile phone based on the induced current in coils L21 and L22.

[0060] When the user places the phone 100 horizontally on the charging base 101, that is, the short side of the phone 100 and the long side of the charging base 101 extend in the same direction, such as... Figure 2C As shown, the phone is being charged in slow charging mode. Figure 2C In the scenario shown, coil L12 in the charging base 101 is coupled to coil L21 in the mobile phone, as follows: Figure 2D As shown. In Figure 2D In the process, coil L12 provides induced current to coil L21, and receiver 02 charges the load in the mobile phone based on the induced current in coil L21.

[0061] In the second possible implementation, the number of coils used for current transmission in the transmitter 01 can be adjusted to switch between fast charging and slow charging modes. In this possible implementation, regardless of whether the user selects fast charging or slow charging mode, the phone 100 can be placed vertically on the charging base 101; that is, the relative positional relationship between the phone 100 and the charging base 101 is as follows: Figure 2A As shown. Furthermore, the phone 100 can also have an application installed for wireless charging management. This application offers two charging modes for the user to choose from: fast charging mode and slow charging mode, such as... Figure 2E As shown, Figure 2E The diagram schematically illustrates the interactive interface presented by the application for wireless charging management. Users can select the wireless charging mode through the interactive interface presented by the application for wireless charging management on mobile phone 100. When the user selects the fast charging mode through the interactive interface, both coils L11 and L12 in transmitter 01 are connected to the current transmission path. The relative positional relationship between the coils in transmitter 01 and the coil in receiver 02 is as follows: Figure 2B As shown, details will not be elaborated further. When the user selects the slow charging mode through the interactive interface, coil L11 or coil L12 in transmitter 01 is connected to the current transmission path. Which coil is connected to the current transmission path can be preset at the factory or selected by the user. When this application embodiment provides the user with the option to choose which coil to use for current transmission, after the user selects the slow charging mode through the interactive interface, the application for wireless charging management can further present an interactive interface for selecting the current transmission of coil L11 or coil L12, such as... Figure 2F As shown. Assuming the user chooses to connect coil L12 into the current transmission path, the relationship between coil L12 in transmitter 01 (used to transmit induced current) and coils L21 and L22 in receiver 02 (used to receive induced current) is as follows: Figure 2G As shown.

[0062] It should be noted that the embodiments of this application can use either the first possible implementation method or the second possible implementation method to set the charging mode, and can also provide the user with both possible methods for setting the charging mode. When the user is provided with both possible implementation methods for selection, the application for wireless charging management presents as follows: Figure 2E Before the page shown, you can also present something like... Figure 2HThe interactive page shown. Figure 2H The interactive page shown presents two options: "Adjust the relative positions of the transmitter and receiver to change the charging mode" and "Adjust the number of coils used to transmit current in the transmitter" to set the charging mode. These two options correspond to the first and second possible implementations mentioned above, respectively.

[0063] based on Figures 1-2H The application scenarios shown below, combined with Figure 3 ,right Figures 1-2H The connection relationships between the transmitter 01 and receiver 02 shown and other devices are explained. The wireless charging system 10 includes two parts: the transmitter 01 and the receiver 02. The transmitter 01 can be coupled to a power supply 20. The power supply 20 can be a voltage source that provides DC power. In specific application scenarios, the power supply 20 can include a home network and a voltage conversion circuit (e.g., a power adapter), and the transmitter 01 is coupled to the home network through the voltage conversion circuit. The voltage conversion circuit converts the AC power provided by the home network into DC power and provides it to the transmitter 01 to power the transmitter 01. In addition, the power supply 20 can also include a battery, which can also directly provide DC power to the transmitter 01. The receiver 02 includes a receiving circuit 021 and a receiving circuit 022. The receiving circuits 021 and 022 are connected in parallel, and the output terminals o1 of the receiving circuit 021 and o2 of the receiving circuit 022 are both coupled to the load 30. Figure 1 The coil L21 shown is located in the receiving circuit 021. Figure 1 The coil L22 shown is disposed in the receiving circuit 022. The receiving circuit 021 can charge the load 30 independently, or it can charge the load 30 together with the receiving circuit 022. The load 30 can be, but is not limited to: a battery, various processors or other types of devices that drive electronic devices, such as a graphics processing unit (GPU), a central processing unit (CPU), an accelerator, or various digital and analog circuits; the load 30 can also be various integrated circuit chips, including but not limited to artificial intelligence chips, image processing chips, etc.

[0064] In traditional wireless charging systems, to improve charging speed for electronic devices, two independent current transmission channels are typically set up at the transmitter and receiver. That is, the transmitter has two independent inverter circuits, each equipped with an inverter and a coil; similarly, the receiver has two independent receiving paths, each equipped with a coil and a rectifier, and each rectifier is isolated from the load by a separate switch. Furthermore, Bluetooth controllers and antennas are located at both the transmitter and receiver, communicating via these devices. Consequently, traditional wireless charging systems are complex and costly to implement.

[0065] The wireless charging system shown in this embodiment can achieve output current regulation and high current output without changing the existing structure of the transmitter or by adding only a small number of coils to the transmitter. The receiver circuit 022 only requires a small number of capacitors and switches. Compared with traditional wireless charging technology, this simplifies circuit design and reduces the production cost of the wireless charging system. Furthermore, since the receiver circuit 022 and the transmitter 01 are decoupled in communication in this embodiment, changes in the output power of the receiver circuit 022 do not require control from the transmitter 01. When excessive load power consumption causes a drop in output voltage, the system can quickly respond by outputting current to the output terminal, improving the reliability of the electronic device.

[0066] based on Figures 1-2H The application scenarios shown Figure 3 The connection relationship between the wireless charging system 10 and the other components shown below is explained in conjunction with... Figures 4-16 The embodiments shown herein provide a detailed description of the wireless charging system described in the present application.

[0067] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of the wireless charging system 10 provided in an embodiment of this application. Figure 4As shown, the transmitter 01 includes an inverter I, coil L11, and coil L12. Coil L11 and coil L12 are coupled to the output terminal of inverter I, that is, coil L11 and coil L12 are connected in parallel at the output terminal of inverter I. In a first possible implementation, coil L11 and coil L12 can be separate independent coils; in a second possible implementation, coil L11 and coil L12 can be two sets of coils formed by multiple taps drawn from the same coil, which is not specifically limited in this embodiment. In addition, in a possible implementation, coil L11 can also be coupled to the output terminal of inverter I through switch k11, and coil L12 can also be coupled to the output terminal of inverter I through switch k12. By setting switches k11 and k12, the number of turns of the coil coupled to the output terminal of inverter I can be changed to change the output power, thereby changing the charging speed of mobile phone 100. For example, when using fast charging mode (corresponding to...) Figure 2B When charging a mobile phone in the scenario shown, transmitter 01 outputs higher power, which can close both switches k11 and k12, and coils L11 and L12 are both coupled to the output of inverter I; when using the first slow charging mode (corresponding to Figure 2D When charging a mobile phone in the scenario shown, transmitter 01 outputs a low power, which can turn off switch k11 and close switch k12. At this time, only coil L12 is coupled to the output of inverter I. When the second slow charging mode (corresponding to...) is used... Figure 2G In the scenario shown, when charging a mobile phone, the transmitter 01 outputs a low power. Based on factory settings or user selection, one of switches k11 and k12 can be closed while the other is turned off. This means that a coil in the transmitter 01 provides an induced current to the receiver 02. Figure 4 In this circuit, transmitter 01 also includes capacitor C1, which is connected in series between the output of inverter I and coil L11, or in other words, between the output of inverter I and coil L12. Capacitor C1 and coil L11 form a series resonant circuit, and similarly, capacitor C1 and coil L12 also form a series resonant circuit. Furthermore, transmitter 01 includes other components, such as transmitter controller 04 and capacitor C5 coupled to the input of inverter I. Transmitter controller 04 includes control terminals CL4 and CL5. Control terminal CL4 is coupled to switch k11 to control the switching of switch k11 on or off, and control terminal CL5 is coupled to switch k12 to control the switching of switch k12 on or off.

[0068] The following is a detailed description of the control of switches k11 and k12 by the transmitter controller 04.

[0069] In such Figure 1Before the mobile phone 100 is placed on the charging base 101, the transmitter controller 04 can periodically control switch k11 to be turned on or off; similarly, it can also periodically control switch k12 to be turned on or off. The periods during which switches k11 and k12 are turned on and off can be the same or different. For example, in period T1, switch k11 is on and switch k12 is off; in period T2, switch k11 is off and switch k12 is on. When switch k11 is on, the transmitter controller 04 can detect whether there is an induced current in coil L11; similarly, when switch k12 is on, the transmitter controller 04 can also detect whether there is an induced current in coil L12.

[0070] In the embodiments of this application, such as Figures 2A-2H As described in the scenario, the charging mode can be switched by adjusting the relative positions of the coil in the transmitter 01 and the coil in the receiver 02.

[0071] When Figure 2A When the mobile phone 100 is placed vertically on the charging base 101, it can be charged in fast charging mode. At this time, coils L11 and L21 are coupled. When switch k11 is turned on, an induced current exists in coil L11. The transmitter controller 04 detects this induced current and keeps switch k11 in the on state. Similarly, coils L12 and L22 are coupled. When switch k12 is turned on, an induced current exists in coil L12. The transmitter controller 04 detects this induced current and keeps switch k12 in the on state.

[0072] When Figure 2C When the mobile phone 100 is placed horizontally on the charging base 101, it can be charged in slow charging mode. Coil L12 and coil L21 are coupled. When switch k12 is turned on, an induced current exists in coil L12. The transmitter controller 04 detects this induced current from coil L11 and keeps switch k12 in the on state. At this time, since there is no coil coupling between the mobile phone 100 and coil L11, the transmitter controller 04 cannot detect the induced current from coil L11. Therefore, the transmitter controller 04 controls switch k11 to turn off.

[0073] In the embodiments of this application, such as Figures 2A-2H As described in the scenario, the charging mode can also be switched by adjusting the relative positions of the coil in the transmitter 01 and the coil in the receiver 02.

[0074] When Figure 2AWhen the mobile phone 100 is placed vertically on the charging base 101, coils L11 and L21 are coupled. When switch k11 is turned on, an induced current exists in coil L11. After the transmitter controller 04 detects this induced current, it keeps switch k11 in the on state. Similarly, coils L12 and L22 are coupled. When switch k12 is turned on, an induced current exists in coil L12. After the transmitter controller 04 detects this induced current, it keeps switch k12 in the on state.

[0075] When users access such as Figure 2E The interactive interface shown shows the receiver controller used to control the various devices in receiver 02 when the phone is charged in fast charging mode. (For a detailed description of the receiver controller, please refer to...) Figure 13 (In the embodiment shown) Based on the user input command, the receiving circuit 021 is controlled to transmit a first electromagnetic induction signal to the transmitting end 01. The first electromagnetic induction signal is used to indicate charging in fast charging mode. After the transmitting end controller 04 detects the first electromagnetic induction signal, it keeps switches k11 and k12 in the on state.

[0076] When users access such as Figure 2E When the user interface shows the option to charge the phone in slow charging mode, the controller in receiver 02, based on the user's input, controls receiver circuit 021 to transmit a second electromagnetic induction signal to transmitter 01. This second electromagnetic induction signal indicates that slow charging mode should be used. After detecting the second electromagnetic induction signal, transmitter controller 04 randomly selects or, based on factory settings, closes one of switches k11 and k12 while the other is open. Furthermore, when the user selects the option to charge the phone in slow charging mode, the controller in receiver 02 controls the receiving circuit 02 to transmit a second electromagnetic induction signal to transmitter 01. Figure 2F When the interactive interface shown selects to charge using coil L12 in slow charging mode, the aforementioned second electromagnetic induction signal is used to indicate that coil L12 is used to transmit induced current to receiver 02; after the transmitter controller 04 detects the second electromagnetic induction signal, it controls switch k12 to turn on and control switch k11 to turn off.

[0077] Furthermore, in this embodiment, when using fast charging mode, after both switches k11 and k12 are closed, if the battery level of the mobile phone 100 is lower than the first preset threshold, the mobile phone 100 needs to use trickle charging. The control terminal 04 receives an indication signal from the receiving terminal 02 to turn off switch k12. Based on this indication signal, the control terminal 04 controls switch k11 to turn off, and the transmitting terminal 01 transmits induced current through coil L11. When the battery level of the mobile phone 100 is greater than or equal to the first preset threshold and lower than the second preset threshold, the mobile phone 100 can use high-current charging. The control terminal 04 receives an indication signal from the receiving terminal 02 to turn on switch k12. Based on this indication signal, the control terminal 04 controls switch k11 to close, and the transmitting terminal 01 outputs induced current to the receiving terminal 02 through coils L11 and L12. When the battery level of mobile phone 100 is greater than or equal to the second preset threshold, the control terminal 04 receives an indication signal from the receiving terminal 02 to indicate the shutdown switch k12. Based on the indication signal, the control terminal 04 controls the switch k11 to turn off. At this time, the transmitting terminal 01 transmits induced current through the coil L11.

[0078] Furthermore, the state of each switch in the transmitter 01 can be dynamically adjusted based on the feedback signal from the receiver circuit 021, which indicates whether the induced current is increased or decreased. For example, when the feedback signal indicates an increase in the induced current, both switches k11 and k12 are closed; when the feedback signal indicates a decrease in the induced current, switch k12 is open.

[0079] It should be noted that, Figures 1-4 The diagram shows two coils, L11 and L12, connected in parallel in the transmitter 01. Other possible implementations include... Figures 1-4 The transmitter 01 shown can have only one coil, which is coupled to both coils L21 and L22 in the receiver 02. When the transmitter 01 has only one coil, switches k11 and k12 are not required. In this case, the transmitter 01 can simultaneously provide induced current to both coils L21 and L22 through this single coil.

[0080] Continue to refer to Figure 4 , Figure 4The receiving circuit 021 shown includes a series resonant circuit LC1 and a rectifier R1, and the receiving circuit 022 includes a series resonant circuit LC2 and a rectifier R2. The series resonant circuit LC1 includes a coil L21, and the series resonant circuit LC2 includes a coil L22. In a first possible implementation, coils L21 and L22 are independent coils; in a second possible implementation, coils L21 and L22 can be two sets of coils formed by multiple taps from the same coil, which is not specifically limited in this embodiment. The series resonant circuit LC1 also includes a capacitor C2. The first end of capacitor C2 is coupled to the first end of coil L21, the second end of capacitor C2 is coupled to the input terminal a1 of rectifier R1, and the second end of coil L21 is coupled to the input terminal a2 of rectifier R2. The series resonant circuit LC2 also includes capacitor C3. The first end of capacitor C3 is coupled to the first end of coil L22, and the second end of capacitor C3 is coupled to the input terminal a3 of rectifier R2. The second end of coil L22 is coupled to the input terminal a4 of rectifier R2. Figure 4 In this embodiment, the output terminal of rectifier R1 is coupled to the output terminal out of receiver 02 as the output terminal o1 of receiver circuit 021; the output terminal of rectifier R2 is coupled to the output terminal out of receiver 02 as the output terminal o2 of receiver circuit 022, and the output terminal out of receiver 02 is coupled to load 30. In this embodiment, current can be output to load 30 through rectifier R1 alone, or current can be output to load 30 through both rectifier R1 and rectifier R2. Receiver 02 also includes other devices, such as capacitor C6 coupled between the output terminal o1 of rectifier R1 and common ground Gnd, and capacitor C7 coupled between the output terminal o2 of rectifier R2 and common ground Gnd.

[0081] exist Figure 4 In the above-mentioned components, the receiving circuit 022 also includes a capacitor circuit 4. The capacitor circuit 4 is coupled between the series resonant circuit LC2 and the rectifier R2. The capacitor circuit 4 includes n capacitor branches, each of which is connected in parallel between the output terminals olc1 and olc2 of the series resonant circuit LC2 (or, each capacitor branch is connected in parallel between the input terminals a3 and a4 of the rectifier R2), where n is an integer greater than or equal to 2. Figure 4 The diagram schematically illustrates three capacitor branches S1, S2, and S3. Each capacitor branch includes at least one capacitor. Figure 4 The diagram schematically illustrates the case where each capacitor branch includes one capacitor. Figure 4In the series resonant circuit LC2, capacitor branches S1, S2, and S3 respectively include capacitors C41, C42, and C43. Capacitors C41, C42, and C43 are connected in parallel between the output terminals olc1 and olc2 of the LC2 series resonant circuit (or, in other words, capacitors C41, C42, and C43 are connected in parallel between the input terminals a3 and a4 of the rectifier R2). Specifically, the first terminals of capacitors C41, C42, and C43 are coupled to the second terminal of capacitor C3 and the input terminal a3 of the rectifier R2; the second terminals of capacitors C41, C42, and C43 are coupled to the second terminal of coil L22 and the input terminal a4 of the rectifier R2. In the receiving circuit 022, coil L22 and the multiple parallel capacitors in capacitor circuit 4 form a parallel resonant circuit. Furthermore, in this embodiment, each capacitor branch is also equipped with a switch, such as... Figure 4 The diagram shows switches k41, k42, and k43, and capacitors C41, C42, and C43 coupled to the output terminal of the series resonant circuit LC2 via switches k41, k42, and k43, respectively. Specifically, in a first possible implementation, the first terminals of capacitors C41, C42, and C43 are coupled to the input terminal a3 of rectifier R2 via switches k41, k42, and k43, respectively; in a second possible implementation, the second terminals of capacitors C41, C42, and C43 are coupled to the input terminal a4 of rectifier R2 via switches k41, k42, and k43, respectively. Figure 4 The diagram schematically illustrates a second possible implementation. In this embodiment, the power output of the receiving circuit 022's output terminal o2 is adjusted by changing the number of capacitors coupled to the two ends of the series resonant circuit LC2 in the capacitor circuit 4. For example, when the receiving circuit 022 requires a higher output power, i.e., a larger capacitor is needed coupled to the two ends of the series resonant circuit LC2, the number of capacitors coupled to the two ends of the series resonant circuit LC2 can be increased; when the receiving circuit 022 requires a lower output power, the number of capacitors coupled to the two ends of the series resonant circuit LC2 can be decreased. By setting a switch in each capacitor branch, the connection between the capacitor of that branch and the output terminal of the series resonant circuit LC2 can be controlled to either be connected or disconnected, thereby controlling the number of capacitors connected to the two ends of the series resonant circuit LC2 and thus controlling the power output of the receiving circuit 022. The receiving circuit 02 described in this embodiment also includes a transmitter controller, which is used to control the switches k41, k42, and k43 to be turned on or off. A detailed description of the transmitter controller is provided below. Figure 15 The relevant description of the illustrated embodiment.

[0082] The above introduces Figure 4 The structure of the wireless charging system 10 shown below will be explained in detail below. Figure 4 The working principle of the wireless charging system 10 shown is described below. In this embodiment, the transmitter 01 and the receiver 021 can communicate based on the Qi protocol introduced by the Wireless Power Consortium (WPC). This communication includes, but is not limited to: authentication between the transmitter 01 and the receiver 021 before transmitting the induced current; the receiver 021 transmitting an indication signal to the transmitter 01 to indicate whether to use a fast charging mode or a slow charging mode; and the receiver 021 providing a feedback signal to the transmitter 01 to indicate whether to increase or decrease the induced current. The receiver 022 does not communicate with the transmitter 01 as described above. The working principle of the wireless charging system 10 will be further explained below using the fast charging mode (i.e., both switches k11 and k12 are closed) as an example.

[0083] Assume that initially, switches k11 and k12 in transmitter 01 are both closed, while switches k41, k42, and k43 in receiver 022 are all open. Inverter I obtains DC power from the power source and converts it into AC power for output. The series resonant circuits formed by coil L11 and capacitor C1, and coil L12 and capacitor C1, respectively obtain AC power from inverter I. Based on the principle of electromagnetic induction, coils L11 and L12 provide induced current to receiver 021 and receiver 022, respectively. The series resonant circuit LC1, composed of coil L21 and capacitor C2 in receiver 021, provides the induced current to rectifier R1. Rectifier R1 rectifies the received current and outputs DC power suitable for the load voltage to charge the load. At this time, since switches k41, k42, and k43 in the receiving circuit 022 are all open, the receiving circuit 022 generates a weak current. The voltage output by rectifier R2 is lower than the voltage output by rectifier R1. The voltage at the output terminal o2 of the receiving circuit 022 is clamped, and the receiving circuit 022 has no current output.

[0084] Assuming that the power output of the receiving circuit 02 is insufficient due to excessive load power consumption, the voltage at the output of rectifier R1 drops. At this time, at least some of the switches k41, k42, and k43 are turned on. The receiving circuit 022 transmits a feedback signal to the transmitting end 01 based on in-band carrier communication. This feedback signal instructs the transmitting end 01 to increase the induced current. The transmitting end 01 increases the induced current output by changing the switching frequency of each switch in inverter I. The receiving circuit 021 provides the obtained induced current to rectifier R1. Rectifier R1 rectifies the received current and outputs a first DC current to the output terminal out of the receiving end 02. The coil L22 and the capacitor in capacitor circuit 4 form a parallel resonant circuit, generating a higher induced current input to rectifier R2. Rectifier R2 rectifies the received current and outputs a second DC current to the output terminal out of the receiving end 02. At this time, the DC output to the load is the sum of the first DC and the second DC. Compared with using only the receiving circuit 021, this greatly increases the power output to the load, thereby improving the charging speed of the electronic device. In this application, the size of the capacitor connected to the two ends of the series resonant circuit LC2 can be controlled by controlling the number of switches k41, k42, and k43 that are turned on, thereby controlling the current and voltage output of the rectifier R2, that is, controlling the output power.

[0085] from Figure 4 As can be seen from the circuit shown, by setting up a receiving circuit 022 and a capacitor circuit 4 in the receiving circuit 022, the power output to the load can be changed by changing the number of capacitors connected in the receiving circuit 022 without changing the communication method between the transmitting circuit and the receiving circuit specified in the original protocol, thereby improving the charging flexibility of the charging device.

[0086] In this embodiment, the total capacitance of the capacitors in capacitor circuit 4 can be determined based on the output voltage-capacitance characteristic curve under various variable parameters in receiving circuit 022. The following example uses coil L12 connected to the current transmission path in transmitting terminal 01. Figures 5-6C The specific example shown illustrates the method for determining the capacitance value in capacitor circuit 4 of this application embodiment. Please refer to... Figure 5 , Figure 5 yes Figure 4 The diagram shows the equivalent circuit diagram of the power transmission between the transmitting end 01 (with coil L12 connected) and the receiving circuit 022. Figure 5In the diagram, Lk is the equivalent leakage inductance of the magnetic coupling system. The magnitude of this equivalent leakage inductance Lk is related to the relative positions of coil L12 in transmitter 01 and coil L22 in receiver circuit 022, the number of turns in coil L12, and the number of turns in coil L22. Lk can be equivalently represented in transmitter 01, receiver circuit 022, or both sides of the circuit. The diagram schematically shows the equivalent leakage inductance Lk on the receiver circuit 022 side. Rp is the equivalent resistance in transmitter 01; Rs is the equivalent resistance in receiver circuit 022; Cd is the equivalent capacitance of the sum of all capacitances in capacitor circuit 4; RL is the load; and the remaining components are... Figure 4 The components shown are the same. For example... Figure 5 The variable parameters in the circuit shown include the switching frequency of inverter I in transmitter 01, the equivalent leakage inductance Lk, and the load RL. By keeping two of these parameters constant and changing the value of one of them, the characteristic curves of the output voltage V of receiver circuit 022 and the capacitance value Cd under different values ​​of this variable parameter can be obtained. Please continue reading. Figures 6A-6C , Figure 6A These are multiple characteristic curves between the output voltage V and the capacitance value Cd obtained when the equivalent leakage inductance Lk is kept constant at 7uH and the load RL is constant at 10Ω, and the switching frequencies of inverter I are selected as 140KHz, 145KHz and 150KHz respectively. Figure 6B These are multiple characteristic curves between the output voltage V and the capacitance value Cd obtained when the switching frequency of inverter I is kept at 145KHz and the load value RL is fixed at 10Ω, and the equivalent leakage inductance Lk is selected as 3uH, 5uH and 7uH respectively; Figure 6C These are multiple characteristic curves between the output voltage V and the capacitance value Cd, obtained when the switching frequency of inverter I is kept at 145kHz and the equivalent leakage inductance Lk is fixed at 7uH, and the load RL is selected as 10Ω, 15Ω, and 20Ω respectively. From... Figures 6A-6C As can be seen, the output voltage V does not increase indefinitely with the increase of capacitor Cd. When capacitor Cd increases to a certain extent, the output voltage V reaches its maximum value. When capacitor Cd continues to increase, the output voltage V gradually decreases. Based on this, in this embodiment, the capacitor value that causes the voltage to reach its maximum value first among the above multiple output voltage V-capacitance Cd characteristic curves is taken as the total capacitance of the capacitor circuit 4. (Comparison) Figures 6A-6CAs shown in the multiple output voltage V-capacitance Cd characteristic curves, with the increase of capacitance, the output voltage reaches its maximum value in the V-capacitance Cd characteristic curves corresponding to a switching frequency of 150kHz, an equivalent leakage inductance Lk of 7uH in the magnetic coupling system, and a load RL of 10Ω. At this point, the capacitance value is 70nF. That is to say, the maximum capacitance of the capacitor in switching unit 4 is 70nF, and the adjustable range of the capacitor coupled to the output terminal of the series resonant circuit LC2 is 0~70nF. Figure 4 Taking the switch unit 4 shown as an example with three capacitor branches, the capacitance of capacitors C41, C42, and C43 in these three branches can gradually increase. For example, the capacitance of capacitor C42 can be twice that of capacitor C41, and the capacitance of capacitor C43 can be twice that of capacitor C42. When the adjustable range of the capacitors in capacitor circuit 4 is 0–70 nF, the capacitance of capacitor C41 can be 10 nF, the capacitance of capacitor C42 can be 20 nF, and the capacitance of capacitor C43 can be 40 nF. When… Figure 4 When switches k41, k42, and k43 are all off, the capacitance coupled to the output of the series resonant circuit LC2 is 0; when... Figure 4 When switches k41, k42, and k43 are all turned on, the capacitance coupled to the output of the series resonant circuit LC2 is 70nF. It should be noted that... Figure 4 The number of capacitor branches included in the capacitor circuit 4 and the size of the capacitor in each branch are only illustrative. The number of capacitor branches and the size of the capacitor in each branch can be set according to the needs of the scenario, as long as the total capacitance coupled to the output terminal of the series resonant circuit LC2 is 70nF when the switch is fully closed. For example, when more precise adjustment of the output power is required, more capacitor branches can be set to make the capacitance adjustment more precise; when the adjustment of the output power does not need to be too precise, fewer capacitor branches can be set.

[0087] It should be noted that, Figures 6A-6C The output voltage-capacitance characteristic curve shown is only illustrative. Measurements are taken based on the application scenario, the load size, the equivalent leakage inductance of the magnetic coupling system, and the switching frequency of inverter I. Multiple output voltage-capacitance characteristic curves are generated based on the measurement results. Finally, the maximum capacitance in capacitor circuit 4 is selected based on these multiple output voltage-capacitance characteristic curves. It should also be noted that the method for determining the maximum capacitance of capacitor circuit 4, the number of capacitors used in capacitor circuit 4, and the size of each capacitor can be preset at the factory. When a user uses the wireless charging system described in this application embodiment to charge electronic devices, the number of capacitors in capacitor circuit 4 and the size of each capacitor generally cannot be changed.

[0088] In this embodiment, the series resonant circuit LC2 composed of coil L22 and capacitor C3 in the receiving circuit 022 outputs alternating current. Figure 4 In the capacitor circuit 4 shown, each capacitor branch is configured with a capacitor and a switch, as follows: Figure 4 The receiver circuit 022 shown can perform half-wave rectification. When the receiver circuit 022 performs half-wave rectification, the rectifier R2 in the receiver circuit 022 is a half-wave rectifier. Please refer to... Figure 7 , Figure 7 As provided in the embodiments of this application Figure 4 The diagram shows a specific structural schematic of the receiving circuit 022. Figure 7 In the receiving circuit 022, the components of the series resonant circuit LC2 and the capacitor circuit 4, as well as the connections between these components, are related to... Figure 4 The series resonant circuit LC2 shown is the same as capacitor circuit 4; please refer to the relevant descriptions for details, which will not be repeated here. Figure 7 In this circuit, rectifier R2 performs half-wave rectification. Rectifier R2 includes transistors M5 and M6. The first terminal of transistor M5 is coupled to the output terminal O2 of receiver circuit O22, and the second terminal of transistor M5 is coupled to the first terminal of transistor M6. The second terminal of transistor M6 is coupled to common ground Gnd. The second terminal of transistor M5 (or the first terminal of transistor M6) is the input terminal A3 of rectifier R2. The second terminal of transistor M6 is the input terminal A4 of rectifier R2. The gates of transistors M5 and M6 are coupled to the controller. For a detailed description of the controller, please refer to the following text. Figure 15 The description of the receiver controller 03 shown is as follows. Figure 7 Transistors M5 and M6 shown can be either Nmos-type or Pmos-type field-effect transistors, and this application does not limit them. When transistors M5 and M6 are Nmos transistors, the first terminal can be the drain and the second terminal can be the source; when transistors M5 and M6 are Pmos transistors, the first terminal can be the source and the second terminal can be the drain.

[0089] like Figure 4 and Figure 7The receiving circuit 022 shown can achieve half-wave rectification. In this embodiment, the receiving circuit 022 can also achieve full-wave rectification. When the receiving circuit 022 achieves full-wave rectification, each branch of the capacitor circuit 4 can be provided with multiple capacitors. Some of these multiple capacitors are coupled between the output terminal olc1 of the series resonant circuit LC2 and the common ground Gnd, and the remaining multiple capacitors are coupled between the output terminal olc2 of the series resonant circuit LC2 and the common ground Gnd. The capacitors coupled between the output terminal olc1 of the series resonant circuit LC2 and the common ground Gnd are the same as those coupled between the output terminal olc2 of the series resonant circuit LC2 and the common ground Gnd. The sameness here can include, but is not limited to, the same number of capacitors and the same capacitance. The following example uses a capacitor circuit 4 with three capacitor branches, each of which is provided with two capacitors, as an example. Figure 8 The structure of capacitor circuit 4 in this possible implementation is described.

[0090] Figure 8 This illustration shows yet another structural schematic diagram of the wireless charging system 10 provided in an embodiment of this application. Figure 8 In the wireless charging system 10, there are a transmitter 01 and a receiver 02. The receiver 02 includes a receiver circuit 021 and a receiver circuit 022. The specific structure of the transmitter 01 and the receiver circuit 021, the connection relationship between the components, and the working principle are described below. Figure 4 The transmitter 01 and receiver circuit 021 in the wireless charging system 10 shown are the same; see reference for details. Figure 4The relevant descriptions in the illustrated embodiments will not be repeated. Unlike the embodiments above, the capacitor circuit 4 in the receiving circuit 022 includes three capacitor branches S1, S2, and S3. Capacitor branch S1 includes capacitors C411 and C412, capacitor branch S2 includes capacitors C421 and C422, and capacitor branch S3 includes capacitors C431 and C432. The first terminals of capacitors C411, C421, and C431 are all coupled to the output terminal olc1 of the series resonant circuit LC2, and the second terminals of capacitors C411, C421, and C431 are all coupled to the common ground Gnd. Similarly, the first terminals of capacitors C412, C422, and C432 are all coupled to the output terminal olc2 of the series resonant circuit LC2, and the second terminals of capacitors C412, C422, and C432 are all coupled to the common ground Gnd. Capacitors C411 and C412 are identical, as are capacitors C421 and C422, and capacitors C431 and C432. Each capacitor branch S1, S2, and S3 also includes two switches: one switch controls whether one capacitor in that branch is connected to or disconnected from the common ground Gnd, and the other switch controls whether the other capacitor in that branch is connected to or disconnected from the common ground Gnd. For example... Figure 8 As shown, capacitor branch S1 also includes switches k411 and k412. Switch k411 is coupled between the second terminal of capacitor C411 and the common ground Gnd, and switch k412 is coupled between the second terminal of capacitor C412 and the common ground Gnd. Capacitor branch S2 also includes switches k421 and k422. Switch k421 is coupled between the second terminal of capacitor C421 and the common ground Gnd, and switch k422 is coupled between the second terminal of capacitor C422 and the common ground Gnd. Capacitor branch S3 also includes switches k431 and k432. Switch k431 is coupled between the second terminal of capacitor C431 and the common ground Gnd, and switch k432 is coupled between the second terminal of capacitor C432 and the common ground Gnd. Figure 8 In the implementation shown, two switches located in the same capacitor branch are simultaneously turned on or simultaneously turned off. Figure 8 The receiving circuit 022 shown includes, in addition to capacitor circuit 4, coil L22, capacitor C3, rectifier R2, and capacitor C7. The structure of coil L22, capacitor C3, rectifier R2, and capacitor C7, as well as their connections to other components, are described below. Figure 4 The coil L22, capacitor C3, rectifier R2, and capacitor C7 shown are the same; please refer to the following for details. Figure 4 The relevant descriptions in the illustrated embodiments will not be repeated here.

[0091] based on Figure 8The structure shown illustrates the following waveforms over time when the switch in capacitor circuit 4 is closed, allowing the capacitor to be connected to the circuit: the voltage V1 output from inverter I, the voltage V2 input to rectifier R2 in receiving circuit 022, the current i1 output from inverter I, the current i2 input to capacitor circuit 4, and the current i3 output from capacitor circuit 4. Figure 9 As shown. In Figure 9 In the graph, the horizontal axis represents time, and the vertical axis represents amplitude. From... Figure 9 As can be seen, after inverter I outputs current i1, coil L22 receives a weak induced current. The capacitor connected in parallel across coil L22 forms a current loop with coil L22, causing the current i3 output from capacitor circuit 4 to rise instantaneously. Due to the presence of series resonant circuit LC2, the rise in current i3 causes the voltage V2 at the input of rectifier R2 to rise rapidly to its maximum value, which also causes a voltage surge at the input of capacitor circuit 4. Figure 5 The sinusoidal current i2 shown keeps voltage V2 at its maximum value until current i3 reverses phase. The reversed current i3 causes voltage V2 to reach its reverse maximum value, and this cycle repeats. The increased voltage can turn on the transistor or diode in rectifier R2, thus outputting current. When no capacitor is provided across coil L22, a closed current loop cannot be formed in receiving circuit 02, so the voltage V2 at the input of rectifier R2 cannot reach its maximum value, and therefore rectifier R2 cannot be triggered to work; that is, receiving circuit 02 cannot output current.

[0092] based on Figure 8 In one possible implementation of the receiver circuit 022 shown, the switches in each of the capacitor branches S1, S2, and S3 can be implemented using field-effect transistors (FETs). These FETs can be either PMOS transistors or NMOS transistors, such as... Figure 10 As shown, Figure 10 This schematically illustrates the case where each of the multiple capacitor branches includes an Nmos transistor as the switch. Figure 10 In this configuration, the drain of transistor k411 is coupled to the second terminal of capacitor C411, and the source of transistor k411 is coupled to the common ground Gnd. Similarly, the drain of transistor k412 is coupled to the second terminal of capacitor C412, and the source of transistor k412 is coupled to the common ground Gnd. The gates of transistors k411 and k412 are coupled to the control terminal of the controller. For a detailed description of the controller, please refer to the following text. Figure 15 The relevant description of the illustrated embodiment is as follows. The connection relationships between transistors k421 and k431 and other components are similar to those between transistor k411 and other components, and the connection relationships between transistors k422 and k432 and other components are similar to those between transistor k412 and other components, and will not be repeated here.

[0093] The following is based on Figure 10 Taking the receiver circuit 022 shown as an example, and the capacitors C411, C421, and C431 in capacitor circuit 4 gradually increasing, combined with... Figure 11 The switch states shown, the current output at output terminal o2 of receiving circuit 022, and the voltage at output terminal o2 of receiving circuit 022 are used to describe the power output at output terminal o2. Figure 11 In this diagram, control signal CL1 is used to control transistors k411 and k412 to turn on or off, control signal CL2 is used to control transistors k421 and k422 to turn on or off, and control signal CL3 is used to control transistors k431 and k432 to turn on or off. The control signals CL1, CL2, and CL3 can be as follows: Figure 13 The outputs of the receiver controller 03 shown are CL1, CL2, and CL3. Because... Figure 10 All transistors shown are NMOS transistors. A high-level signal is applied to the gate of each transistor, and the transistor is turned on; a low-level signal is applied to the gate, and the transistor is turned off. Figure 11 In the middle, a preset voltage is applied to the output terminal o2 of the receiving circuit 022. Figure 11 The diagram shows an 8V voltage applied and maintained constant. When control signals CL1, CL2, and CL3 are all low, transistors k411 through k432 are all off, and the output current is close to 0. When control signal CL1 is high and control signals CL2 and CL3 are low, transistors k411 and k412 are on, the remaining transistors are off, and capacitors C411 and C412 are coupled to the input of rectifier R2, increasing the output current to 0.1A. When control signal CL2 is high and control signals CL1 and CL3 are low, transistors k421 and k422 are on, the remaining transistors are off, and capacitors C421 and C422 are coupled to the input of rectifier R2, increasing the output current to 0.2A. Figure 11 As can be seen, with the increase of the capacitance coupled in parallel at the input of rectifier R2, the current output at output terminal O2 of receiver circuit 022 gradually increases. Since the voltage at output terminal O2 remains constant, the power output of receiver circuit 022 gradually increases. When control signals CL1, CL2, and CL3 output high-level signals, causing transistors k411 to k432 to all conduct, the capacitance coupled across rectifier R2 reaches its maximum value. At this time, the current output at output terminal O2 of receiver circuit 022 reaches its maximum value, and the power output of receiver circuit 022 reaches its maximum value. Figure 11As can be seen from the embodiments of this application, the output power of the receiving circuit 022 can be changed by changing the size of the capacitor coupled in parallel at the input terminal of the rectifier R2.

[0094] Figure 8 and Figure 10 In any of the receiver circuits 022 shown, rectifier R2 can be a full-wave rectifier, which can be implemented in various ways. In one possible implementation, the bridge arm of rectifier R2 is a transistor, such as... Figure 12A As shown. Rectifier R2 includes transistors M5, M6, M7, and M8. The first terminals of transistors M5 and M6 are coupled to the output terminal o2 of rectifier R2; the second terminals of transistors M5 and M7 are coupled to the input terminal a3 of rectifier R2; the second terminals of transistors M6 and M8 are coupled to the input terminal a4 of rectifier R2; and the second terminals of transistors M7 and M8 are coupled to the common ground Gnd. Transistors M5, M6, M7, and M8 can be NMOS type field-effect transistors or PMOS type field-effect transistors; this embodiment does not limit the choice. When the transistors are NMOS transistors, the first terminal can be the drain and the second terminal can be the source; when the transistors are PMOS transistors, the first terminal can be the source and the second terminal can be the drain. In another possible implementation, the bridge arms of rectifier R2 can be diodes, such as... Figure 12B As shown. Rectifier R2 includes diodes D1, D2, D3, and D4. The anode of diode D1 and the cathode of diode D2 are coupled to the input terminal a3 of rectifier R2. The anode of diode D3 and the cathode of diode D4 are coupled to the input terminal a4 of rectifier R2. The cathodes of diode D1 and D3 are coupled to the output terminal o2 of rectifier R2. The anodes of diode D2 and D4 are coupled to the common ground Gnd.

[0095] based on Figure 4 , Figure 7 , Figure 8 , Figure 10 , Figures 12A-12B The structure of the receiver 02 shown in this embodiment of the application is as follows: Figure 4 , Figure 7 , Figure 8 , Figure 10 , Figures 12A-12B Based on the circuit structure included in the receiver 02 shown in any embodiment, the receiver 02 further includes a receiver controller 03, such as... Figure 13As shown. The receiver controller 03 is used to configure the electrical parameters output by the receiver circuit 021, the electrical parameters output by the receiver circuit 022, and the electrical parameters output to the load. These electrical parameters may include, but are not limited to, voltage, current, and power. The receiver controller 03 is also used to control the receiver circuit 021 to provide feedback information to the transmitter 01, instructing the transmitter 01 to increase or decrease the induced current. Furthermore, the transmitter controller 03 is also used to output control signals to each switch in the capacitor circuit 4 of the receiver circuit 022 based on the electrical parameters output by the receiver circuit 021, the electrical parameters output by the receiver circuit 022, and the electrical parameters provided to the load, to control the switches to be turned on or off. The receiver controller 03 described in this embodiment can be an integrated controller. In specific implementations, the controller 104 can be various digital logic devices or circuits, including but not limited to: central processing units, microcontrollers, microprocessors, or digital signal processors (DSPs). The receiver controller 03 can be controlled via I... 2 The C bus is coupled to the output terminals (out) of rectifiers R1 and R2, and receiver circuit O2, to obtain the aforementioned electrical parameters. The transmitter controller also includes multiple output terminals, which are respectively coupled to... Figure 4 , Figure 7 , Figure 8 , Figure 10 , Figures 12A-12B The switches in the multiple capacitor branches included in the receiver circuit 022 shown are correspondingly coupled. For example, the receiver controller 03 includes output terminals CL1, CL2, and CL3, and the control terminals CL1, CL2, and CL3 in the receiver controller 03 can respectively output... Figure 10 The control signals CL1, CL2, and CL3 are shown. When the capacitor branch in capacitor circuit 4 is... Figure 8 In the capacitor branch structure shown, output terminal CL1 is coupled to the control terminal of switch k41, output terminal CL2 is coupled to the control terminal of switch k42, and output terminal CL3 is coupled to the control terminal of switch k43; when the capacitor branch in capacitor circuit 4 is Figure 8 In the capacitor branch structure shown, output terminal CL1 is coupled to the control terminals of switches k411 and k412, output terminal CL2 is coupled to switches k421 and k422, and output terminal CL3 is coupled to switches k431 and k432; when the switches in capacitor circuit 4 are as follows... Figure 10 When the transistors are shown, the control terminal CL1 of the receiver controller 03 is coupled to the gates of transistors k411 and k412, the control terminal CL2 is coupled to the gates of transistors k421 and k422, and the control terminal CL3 is coupled to the gates of transistors k431 and k432. Furthermore, when the rectifier R2 in the embodiments of this application has the following structure... Figure 12AIn the structure shown, the receiver controller 03 is also coupled to the gate of each transistor included in the rectifier R2 to control the transistor to turn on or off in order to achieve rectification. Figure 13 This schematically illustrates what happens when the receiving circuit 022 is as follows: Figure 8 The structure shown, and the receiving circuit 021 are Figure 4 The diagram shown illustrates the coupling relationship between the receiver controller 03 and the components in each receiver circuit. Furthermore, in... Figure 13 The diagram also schematically illustrates the circuit structure of transmitter 01, which is similar to... Figure 4 The circuit structure of transmitter 01 shown is the same and will not be described again.

[0096] In this embodiment, to make the voltage output by the output terminal OUT of the receiver 02 more stable and flexibly adjustable, in one possible implementation, based on the circuit structure included in the receiver 02 shown in any of the above embodiments, at least one of the output terminals of rectifier R1 and rectifier R2 is provided with a DC-DC conversion circuit between the output terminal and the load. For example, a DC-DC conversion circuit is provided between the output terminal OUT1 of rectifier R1 and the load 30; or a DC-DC conversion circuit is provided between the output terminal OUT2 of rectifier R2 and the load 30; or DC-DC conversion circuits are provided between the output terminal OUT1 of rectifier R1 and the load 30, and also between the output terminal OUT2 of rectifier R2 and the load 30. Figure 14 This illustration shows a scenario where a DC-DC conversion circuit 1 is provided between the output terminal o1 of rectifier R1 and the load 30, and DC-DC conversion circuits 2 are provided between the output terminal o2 of rectifier R2 and the load 30. The DC-DC conversion circuits may include, but are not limited to, voltage conversion circuits such as buck circuits, boost circuits, or boost-buck circuits. This embodiment does not specifically limit the DC-DC conversion circuits used. Figure 14 The structure of the receiver 02 shown, for example in a specific scenario, reduces the induced current provided by the transmitter 01 by reducing the output voltage of rectifier R1 and rectifier R2, thereby reducing power loss. Reducing the output voltage of rectifier R1 and rectifier R2 may result in insufficient voltage supplied to the load 30, causing abnormal operation of the load 30. By setting a DC-DC conversion circuit, the output voltage of rectifier R1 and rectifier R2 can be further boosted to improve power supply stability, which is beneficial to the stable operation of the load 30.

[0097] like Figures 4-14In the wireless charging system 10 shown, the receiver 02 includes two receiving circuits: receiving circuit 021 and receiving circuit 022. In other possible implementations of this application, the receiver 02 may include more receiving circuits, such as 3 or 4 circuits. This application does not specifically limit the number of receiving circuits. The following example uses a receiver 02 with three circuits. Figure 15 The case where receiver 02 includes more receiving circuits is described further. Figure 15 In this circuit, receiving circuit 02 includes receiving circuit 021, receiving circuit 022, and receiving circuit 023. Receiving circuit 021 can act as the main receiving circuit, providing feedback signals to transmitting end 01 according to the Qi protocol. Each of receiving circuits 022 and 023 includes a series resonant circuit, a capacitor unit, and a rectifier, respectively. The structure of any one of receiving circuits 022 and 023 is similar to... Figure 4 , Figure 7 , Figure 8 , Figure 10 , Figures 12A-14 The receiving circuit 022 described in any embodiment has the same structure; please refer to the following for details. Figure 4 , Figure 7 , Figure 8 , Figure 10 , Figures 12A-14 The description of the receiving circuit 022 shown in any embodiment will not be repeated here.

[0098] The above has been approved. Figures 4-15 The illustrated embodiments describe the structure and working principle of the wireless charging system 10 described in this application. In this application, the wireless charging system 10 can charge electronic devices through multiple charging stages, including trickle charging and constant current charging. The following example, using a user selecting a fast charging mode, demonstrates this. Figure 13 The circuit shown and Figure 16 The flowchart shown describes the control of each switch in the capacitor circuit 4 by the receiver controller 03 according to the embodiments of this application, as well as the operating mode of the receiver 02. Figure 16 The process shown is applied to Figure 13 The receiver controller 03 is shown. When the user sets the charging mode to fast charging mode through the electronic device and the electronic device is placed on the charging base, switches k11 and k12 in the transmitter 01 are closed, and switches k411 to k432 in the capacitor circuit 4 are open.

[0099] Step 1601: Authentication is performed between the receiving circuit 021 and the transmitting end 01 before induced current transmission. After the receiving circuit 021 and the transmitting end 01 are authenticated and a connection is established, step 1602 is executed.

[0100] Step 1602: Detect the current battery level of the electronic device and determine whether the current battery level is lower than the first preset threshold. If the current battery level is lower than the first preset threshold, trickle charging is used, and step 1603 is executed. If the current battery level is greater than or equal to the first preset threshold, constant current charging is used, and step 1604 is executed.

[0101] When the current battery level of an electronic device is lower than the first preset threshold, it indicates that the voltage of the electronic device is too low. In order to protect the load such as the battery and CPU in the electronic device, trickle charging is used at this time. When the current battery level of the electronic device is greater than or equal to the first preset threshold, constant current charging can be used. Constant current charging can also be called high current charging.

[0102] In step 1603, switches k411 to k432 in the control capacitor circuit 4 are all turned off. At this time, receiver 02 charges the load through receiver circuit 021. In trickle charging mode, receiver controller 03 continuously monitors the battery level of the electronic device. When the battery level of the electronic device is detected to be greater than or equal to the first preset threshold, constant current charging is used, and step 1604 is executed.

[0103] Step 1604: Detect whether the current output from the output terminal o1 of the receiving circuit 021 reaches the first preset current value. If the first preset current value is not reached, proceed to step 1605; if the first preset current value is reached, proceed to step 1606.

[0104] The receiver controller 03 can pre-store the total current output from the output terminal OUT of receiver 02 under constant current charging scenarios, as well as the current distribution relationship between the output currents of receiver circuits 021 and 022. For example, assuming the total current output from the output terminal OUT of receiver 02 under constant current charging scenarios is 1A, and the current distribution relationship between receiver circuits 021 and 022 is 1:1, then the current output by receiver circuit 021 is 0.5A, and the current output by receiver circuit 022 is 0.5A. At this time, the aforementioned first preset current value is 0.5A, and the receiver controller 03 detects whether the current output by receiver circuit 021 reaches 0.5A. When the current output by receiver circuit 021 does not reach 0.5A, step 1605 is executed; when the current output by receiver circuit 021 reaches 0.5A, step 1606 is executed.

[0105] Step 1605: Keep switches k411 to k432 in the open state, and control the receiving circuit 021 to send a signal to the transmitting end 01 indicating an increase in the induced current.

[0106] Repeat steps 1604 and 1605 until the current output from the output terminal o1 of the receiving circuit 021 reaches the first preset current value, then execute step 1606.

[0107] Step 1606, based on such Figure 11 The relationship between the switch states shown and the output current at the output terminal o2 of the receiving circuit 022 is used to adjust the on / off state of each switch in switches k411 to k432.

[0108] Step 1607: After the current output from the output terminal o1 of the receiving circuit 021 stabilizes, check whether the current output from the output terminal o2 of the receiving circuit 022 reaches the second preset current value. If it is detected that the current output from the output terminal o2 has not reached the preset current value, repeat steps 1606 and 1607 until the current output from the output terminal o2 reaches the second preset current value; if it is detected that the current output from the output terminal o2 has reached the second preset current value, execute step 1608.

[0109] The stable current output at output terminal o1 mentioned in step 1607 means that the current output at output terminal o1 remains stable at a first preset current value. Typically, each adjustment of the on / off state of switches k411-k432 in step 1606 affects the current output at output terminal o1 of receiving circuit 021. For example, when adjusting the on / off state of switches k411-k432 increases the current output at output terminal o2 of receiving circuit 022, with the magnitude of the induced current transmitted by transmitting end 01 remaining constant, more current is diverted to receiving circuit 022, causing the current output at output terminal o1 of receiving end 021 to decrease, i.e., fall below the first preset current value. When receiving end controller 03 detects that the current output at output terminal o1 is lower than the first preset current value, it controls receiving circuit 021 to send a signal to transmitting end 01 instructing an increase in the induced current. After the induced current transmitted by transmitting end 01 increases, the current output at output terminal o1 of receiving end 021 rises. Once the receiving end controller 03 detects that the current output by the output terminal o1 reaches the first preset current value and remains unchanged within a preset time period, it can further detect whether the current output by the output terminal o2 of the receiving circuit 022 reaches the second preset current value.

[0110] The following example provides a more detailed explanation of steps 1606 and 1607. Assume the second preset current value is 0.5A, and the receiver controller 03 controls switches k21 and k22 to be turned on, while the other switches are turned off. (See attached example.) Figure 11 The diagram shows the relationship between the on / off state of the switches and the output current at output terminal O2. At this point, the output current at output terminal O2 is 0.2A, less than 0.5A. The receiver controller 03 controls switches K11, K12, 21, and 22 to be on, while the remaining switches are off. The receiver controller 03 then detects the output current at output terminal O1. After the output current at output terminal O1 stabilizes (e.g., remains unchanged within a preset time interval), the receiver controller 03 detects the output current at output terminal O2 and compares it with the output current at output terminal O2. Figure 11 The relationship between the on / off state of the switch and the output current of the output terminal o2 is shown. At this time, the output current of the output terminal o2 is 0.5A, which has reached the preset current value.

[0111] After repeatedly executing steps 1606 to 1607, receiver 02 charges the load through receiver circuits 021 and 022. Step 1608: Detect the battery level of the electronic device.

[0112] Step 1609: Determine whether the battery level of the electronic device is greater than the second preset threshold. If the battery level of the electronic device is greater than the second preset threshold, proceed to step 1610; if the battery level of the electronic device is less than or equal to the second preset threshold, proceed to step 1608.

[0113] Step 1610: Switches k411 to k432 in the control capacitor circuit 4 are all turned off.

[0114] When the battery level of the electronic device exceeds the second preset threshold (e.g., 80%), high-current charging may overcharge the battery and damage it. In this case, receiver 02 charges the load through receiver circuit 021. Therefore, switches k411 to k432 in control capacitor circuit 4 are all disconnected.

[0115] Step 1611: The battery level of the electronic device is detected to have reached its maximum value. The control receiving circuit 021 sends a signal to the transmitting end 01 to stop charging.

[0116] The above describes a charging method for the wireless charging system 10 provided in the embodiments of this application. In one possible implementation of the embodiments of this application, during the constant current charging stage shown in steps 1604 to 1607, when the receiver controller 03 detects an abnormal temperature of the electronic device (e.g., the temperature of coil L21, coil L22, or battery is detected to be too high by a temperature sensor), the controller 103 can control k411 to k432 to be turned off, and control the receiving circuit 021 to feed back a signal to the transmitting end 01 indicating a reduction in the induced current.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A wireless charging receiver, characterized in that, It includes a first receiving circuit and a second receiving circuit connected in parallel, which are used to charge the load. The first receiving circuit includes a first series resonant circuit, a capacitor circuit, and a first rectifier; The first output terminal and the second output terminal of the first series resonant circuit are respectively coupled to the first input terminal and the second input terminal of the first rectifier. The capacitor circuit includes multiple capacitor branches, which are connected in parallel between the first output terminal and the second output terminal of the first series resonant circuit. Each capacitor branch includes at least one capacitor and at least one switch. The at least one capacitor is coupled between the first output terminal and the second output terminal of the first series resonant circuit through the at least one switch. The second receiving circuit includes a second series resonant circuit and a second rectifier; The first and second output terminals of the second series resonant circuit are respectively coupled to the first and second input terminals of the second rectifier.

2. The wireless charging receiver according to claim 1, characterized in that, Each of the plurality of capacitor branches includes a first capacitor and a first switch; The first end of the first capacitor is coupled to the first output terminal of the first series resonant circuit, the second end of the first capacitor is coupled to the first terminal of the first switch, and the second end of the first switch is coupled to the second output terminal of the first series resonant circuit.

3. The wireless charging receiver according to claim 2, characterized in that, The first rectifier is a half-wave rectifier.

4. The wireless charging receiver according to claim 1, characterized in that, Each of the plurality of capacitor branches includes a first capacitor, a second capacitor, a first switch, and a second switch. The first end of the first capacitor is coupled to the first output terminal of the first series resonant circuit, the second end of the first capacitor is coupled to the first end of the first switch, and the second end of the first switch is coupled to the common ground. The first end of the second capacitor is coupled to the second output terminal of the first series resonant circuit, the second end of the second capacitor is coupled to the first end of the second switch, and the second end of the second switch is coupled to the common ground.

5. The wireless charging receiver according to claim 4, characterized in that, The first rectifier is a full-wave rectifier.

6. The wireless charging receiver according to claim 1, characterized in that, The first series resonant circuit includes a first coil and a third capacitor; The first end of the first coil is coupled to the first input end of the first rectifier through the third capacitor; The second end of the first coil is coupled to the second input end of the first rectifier.

7. The wireless charging receiver according to claim 1, characterized in that, The second series resonant circuit includes a second coil and a fourth capacitor; The first end of the second coil is coupled to the first input end of the second rectifier through the fourth capacitor; The second end of the second coil is coupled to the second input terminal of the second rectifier.

8. The wireless charging receiver according to any one of claims 1-7, characterized in that, The wireless charging device also includes a receiver controller; The receiver controller is used to acquire the electrical parameters of the output terminals of the first and second receiving circuits; Based on the electrical parameters, control the switch in the capacitor circuit to be turned on or off; The electrical parameters include at least one of the following: voltage, current, and power.

9. The wireless charging receiver according to claim 8, characterized in that, The receiver controller is used for: The current battery level of the electronic device is detected, and when the current battery level of the electronic device is lower than a first preset threshold, the switch in the capacitor circuit is controlled to turn off.

10. The wireless charging receiver according to claim 9, characterized in that, The receiver controller is also used for: When the current battery level of the electronic device is greater than or equal to a first preset threshold and less than a second preset threshold, it is detected whether the current output by the second receiving circuit reaches a preset current value. When the current output by the second receiving circuit reaches a preset current value, at least some switches in the capacitor circuit are turned on.

11. The wireless charging receiver according to claim 9 or 10, characterized in that, The receiver controller is also used for: When the current battery level of the electronic device is greater than or equal to a second preset threshold, the switch in the capacitor circuit is turned off.

12. The wireless charging receiver according to claim 8, characterized in that, The receiver controller is also used for: In response to detecting a first instruction sent by a user, the second receiving circuit is controlled to transmit a first electromagnetic induction signal to the wireless charging transmitting device. The first instruction is used to indicate charging in a fast charging mode, and the first electromagnetic induction signal is used to indicate charging in a fast charging mode.

13. The wireless charging receiver according to claim 8, characterized in that, The receiver controller is also used for: In response to detecting a second command sent by the user, the second receiving circuit is controlled to transmit a second electromagnetic induction signal to the wireless charging transmitting device. The second command is used to indicate charging in a slow charging mode, and the second electromagnetic induction signal is used to indicate charging in a slow charging mode.

14. The wireless charging receiver according to claim 10, characterized in that, The receiver controller is also used for: If the detected current output by the second receiving circuit does not reach the preset current value, the second receiving circuit is controlled to transmit a third electromagnetic induction signal to the wireless charging transmitter. The third electromagnetic induction signal is used to instruct the wireless charging transmitter to increase or decrease the induced current.

15. The wireless charging receiving device according to any one of claims 1-7, 9-10, and 12-14, characterized in that, The first receiving circuit further includes a first DC-DC conversion circuit; The first DC-DC converter circuit is used to convert the first voltage output by the first rectifier to generate a second voltage and provide it to the output terminal of the first receiving circuit.

16. The wireless charging receiving device according to any one of claims 1-7, 9-10, and 12-14, characterized in that, The second receiving circuit also includes a second DC-DC conversion circuit; The second DC-DC converter circuit is used to convert the third voltage output by the second rectifier to generate a fourth voltage, which is then supplied to the output of the second receiving circuit.

17. An electronic device, characterized in that, Includes a load and a wireless charging receiver as described in any one of claims 1-16; The output terminals of the first receiving circuit and the second receiving circuit are coupled to the load; The first receiving circuit and the second receiving circuit are used to charge the load.

18. A wireless charging system, characterized in that, Includes a wireless charging transmitter and a wireless charging receiver as described in any one of claims 1-16; The wireless charging transmitter is used to output an induced current to the wireless charging receiver.

19. The wireless charging system according to claim 18, characterized in that, The wireless charging transmitter includes at least one coil; The at least one coil is coupled to the first and second coils in the wireless charging receiver.

20. The wireless charging system according to claim 19, characterized in that, The wireless charging transmitter includes a third coil and a fourth coil, and also includes an inverter circuit. The third coil and the fourth coil are connected in parallel at the output terminal of the inverter circuit.

21. The wireless charging system according to claim 20, characterized in that, The wireless charging transmitter also includes a third switch and a fourth switch; The third coil is coupled to the output terminal of the inverter circuit via the third switch; The fourth coil is coupled to the output terminal of the inverter circuit via the fourth switch; The wireless charging transmitter also includes a transmitter controller, which is used to detect the electrical parameters of the third coil and the fourth coil, and control the third switch and the fourth switch to be turned on or off according to the electrical parameters of the third coil and the fourth coil. The electrical parameters of the third coil and the fourth coil include at least one of the following: voltage, current, or power.

22. The wireless charging system according to claim 21, characterized in that, The transmitter controller is used for: The third switch is periodically turned on or off. When the third switch is turned on, the third switch is kept in the on state in response to the detection of induced current from the third coil.

23. The wireless charging system according to claim 21, characterized in that, The transmitter controller is used for: The fourth switch is periodically turned on or off. When the fourth switch is turned on, the fourth switch is kept in the on state in response to the detection of induced current from the fourth coil.

24. The wireless charging system according to claim 22 or 23, characterized in that, The transmitter controller is also used for: The wireless charging receiver receives a first electromagnetic induction signal, which is used to indicate charging in fast charging mode. Based on the first electromagnetic induction signal, the third switch and the fourth switch are controlled to close.

25. The wireless charging system according to claim 22 or 23, characterized in that, The transmitter controller is also used for: The wireless charging receiver receives a second electromagnetic induction signal, which is used to indicate charging in slow charging mode. Based on the second electromagnetic induction signal, one of the third switch and the fourth switch is controlled to close.

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