Controller of wireless charging device, and power module and electronic device

Abstract

A controller applied to a wireless charging device. The controller is used for measuring a first power loss, wherein the first power loss is a coupling loss between a standard coil and a reception coil of an electronic device when the electronic device is at a preset position on the standard coil. The controller is further used for converting, on the basis of a parameter relationship between the standard coil and a transmission coil and the relationship between the preset position and the actual position of the electronic device on the transmission coil, the first power loss into the actual coupling loss between the transmission coil and the reception coil when the electronic device is at the actual position on the transmission coil. The controller is further used for performing foreign object detection on the basis of the actual coupling loss. The embodiments of the present application define a method for calculating a wireless charging coupling loss, more accurately compile statistics on the overall power consumption during transmission, and improve the precision of foreign object detection.

Description

Controllers, power modules and electronic devices for wireless charging devices Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a quality factor detection circuit, detection method and electronic device based on an oscillation circuit. Background Technology

[0002] With the popularization of wireless charging technology, many wireless charging products have emerged in the market, among which mobile phone transmitters based on the Wireless Power Consortium (WPC) Qi standard have the largest market share.

[0003] In wireless charging applications, these products typically operate in an open environment. For example, a wirelessly charging phone is charged using an accessory charger, with the phone and charger being independent and detachable products. The transmitting (TX) device in the accessory needs to detect and identify the receiving (RX) device (usually installed inside the wirelessly charging-enabled electronic device like the phone) in real time. Once the receiving device is detected, charging begins to complete the power transfer. Simultaneously, it's crucial to detect any foreign objects between the transmitting and receiving devices. Inaccurate detection of foreign objects can lead to damage during charging (e.g., bank cards, ID cards), severely hindering the development of the wireless charging industry. Therefore, foreign object detection is a primary safety concern in wireless charging and a major pain point for the industry.

[0004] Currently, wireless charging foreign object detection capabilities are limited, with a small coverage area, leaving many foreign objects undetected. This seriously threatens the safety of wireless charging and is extremely detrimental to the further development of the industry. The primary foreign object detection method currently used is the quality factor (Q) value detection method. The principle of the Q value detection method is that when a foreign object exists between the transmitting and receiving devices, it affects the parameters of the inductor coil of the transmitting device, thus affecting the Q value of the inductor coil. Therefore, detecting the Q value of the inductor coil can indicate the presence of a foreign object. Improving the detection accuracy and speed of the Q value can improve the accuracy of foreign object detection; therefore, how to detect the Q value with high precision has become a problem that needs to be solved.

[0005] Summary of the Invention

[0006] In a first aspect, this application provides a controller for a wireless charging device, the wireless charging device being used to wirelessly charge electronic devices, the wireless charging device comprising: a resonant network, an inverter circuit, and the controller; the resonant network comprising a resonant capacitor and a transmitting coil; the input terminal of the inverter circuit being connected to a DC power supply, and the output terminal of the inverter circuit being connected to the resonant network;

[0007] The controller is used to measure a first power loss, which is the coupling loss between the standard coil and the receiving coil of the electronic device when the electronic device is in a preset position on the standard coil.

[0008] The controller is further configured to convert the first power loss into the actual coupling loss between the transmitting coil and the receiving coil when the electronic device is in its actual position on the transmitting coil, based on the parameter relationship between the standard coil and the transmitting coil, and the relationship between the preset position and the actual position of the electronic device on the transmitting coil.

[0009] The controller is also used to perform foreign object detection based on the actual coupling loss.

[0010] For example, a standard power transmitter, such as MP-A2, can be defined, and its coordinates (x, y, h) can be specified. The electronic device can then be placed at the specified location to measure the loss. Based on the direct conversion function between the standard power transmitter and the actual power transmitter, the loss measured in the previous step is converted to obtain the actual coupling loss.

[0011] This application defines a method for calculating wireless charging coupling loss, which more accurately calculates the overall power consumption during transmission and improves the accuracy of foreign object detection.

[0012] In one possible implementation, the controller is further configured to acquire a second power loss and a third power loss; the second power loss is the power loss of the resonant circuit and the inverter circuit itself, the first power loss is the coupling loss between the transmitting coil and the receiving coil in the electronic device, and the third power loss is the power loss of the resonant circuit and the rectifier circuit itself in the electronic device.

[0013] When the controller performs foreign object detection based on the actual coupling loss, it is specifically used for:

[0014] Based on the second power loss, the actual coupling loss, and the third power loss, the dissipation power of the foreign object between the wireless charging device and the electronic device is determined; based on the dissipation power, foreign object detection is performed.

[0015] For example, it can be calculated using the following formula:

[0016] Where Pi is the input power of the power transmitter, P0 is the output power of the power receiver, pt is the second power loss, pr is the third power loss, and pt&r is the actual coupling loss;

[0017] In one possible implementation, the coupling loss includes the power loss of the ferrite in the transmitting coil that limits the magnetic field.

[0018] In one possible implementation, the coupling loss includes the power loss of the ferrite in the receiving coil that limits the magnetic field.

[0019] In one possible implementation, the coupling loss includes power loss in the metal components of the transmitting coil exposed to the magnetic field.

[0020] In one possible implementation, the coupling loss includes power loss in the metal components of the receiving coil exposed to the magnetic field.

[0021] In one possible implementation, the preset position and the actual position are specifically three-dimensional positions including the height direction.

[0022] Secondly, this application provides a control method applied to a wireless charging device, the wireless charging device being used to wirelessly charge electronic devices, the wireless charging device comprising: a resonant network, an inverter circuit, and a controller; the resonant network comprising a transmitting coil; the input terminal of the inverter circuit being connected to a DC power supply, and the output terminal of the inverter circuit being connected to the resonant network;

[0023] The method includes:

[0024] Measure the first power loss, which is the coupling loss between the standard coil and the receiving coil of the electronic device when the electronic device is in a preset position on the standard coil;

[0025] Based on the parameter relationship between the standard coil and the transmitting coil, and the relationship between the preset position and the actual position of the electronic device on the transmitting coil, the first power loss is converted into the actual coupling loss between the transmitting coil and the receiving coil when the electronic device is actually positioned on the transmitting coil;

[0026] Foreign object detection is performed based on the actual coupling loss.

[0027] In one possible implementation, the method further includes:

[0028] The second power loss and the third power loss are obtained; the second power loss is the power loss of the resonant circuit and the inverter circuit itself, the first power loss is the coupling loss between the transmitting coil and the receiving coil in the electronic device, and the third power loss is the power loss of the resonant circuit and the rectifier circuit in the electronic device itself.

[0029] The foreign object detection based on the actual coupling loss includes:

[0030] Based on the second power loss, the actual coupling loss, and the third power loss, the dissipation power of the foreign object between the wireless charging device and the electronic device is determined; based on the dissipation power, foreign object detection is performed.

[0031] In one possible implementation, the coupling loss includes the power loss of the ferrite in the transmitting coil that limits the magnetic field.

[0032] In one possible implementation, the coupling loss includes the power loss of the ferrite in the receiving coil that limits the magnetic field.

[0033] In one possible implementation, the coupling loss includes power loss in the metal components of the transmitting coil exposed to the magnetic field.

[0034] In one possible implementation, the coupling loss includes power loss in the metal components of the receiving coil exposed to the magnetic field.

[0035] In one possible implementation, the preset position and the actual position are specifically three-dimensional positions including the height direction.

[0036] Thirdly, this application provides a power supply module, including a resonant network, an inverter circuit, and a controller as described in any one of the first aspects; the resonant network includes a transmitting coil; the input terminal of the inverter circuit is used to connect to a DC power supply, and the output terminal of the inverter circuit is used to connect to the resonant network.

[0037] Fourthly, this application provides an electronic device including a controller as described in any of the first aspects of this application.

[0038] Fifthly, this application provides an electronic device including a power module as described in any of the third aspects of this application. Attached Figure Description

[0039] Figure 1 is a schematic diagram of an electronic device provided in this application;

[0040] Figure 2 is another schematic diagram of an electronic device provided in this application;

[0041] Figure 3 is a schematic diagram of a power module provided in an embodiment of this application;

[0042] Figure 4 is a schematic diagram of a foreign object detection process provided in an embodiment of this application;

[0043] Figure 5 is a schematic diagram of a foreign object detection process provided in an embodiment of this application. Detailed Implementation

[0044] The embodiments of the present invention will now be described with reference to the accompanying drawings. The terminology used in the embodiments section is for illustrative purposes only and is not intended to limit the scope of the invention.

[0045] The embodiments of this application will now be described with reference to the accompanying drawings. Those skilled in the art will recognize that, with technological advancements and the emergence of new scenarios, the technical solutions provided in the embodiments of this application are equally applicable to similar technical problems.

[0046] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0047] The terms “substantially,” “about,” and similar terms used herein are used as approximations rather than as terms of degree, and are intended to take into account the inherent biases of measurements or calculations known to those skilled in the art. Furthermore, the use of “may” in describing embodiments of the invention refers to “one or more possible embodiments.” The terms “use,” “using,” and “used” used herein are to be considered synonymous with the terms “utilize,” “utilizing,” and “utilized,” respectively. Additionally, the term “exemplary” is intended to refer to an instance or illustration.

[0048] The embodiments of this application are applied to a wireless charging system, which includes an electronic device 01 and a charger 02 as shown in FIG1, wherein the charger 02 acts as a transmitter and the electronic device 01 acts as a receiver. The electronic device includes mobile phones, tablets, computers with wireless transceiver capabilities, smart wearable products (e.g., smartwatches, smart bracelets), virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, and other wireless devices. The aforementioned electronic device can also be a wirelessly charging electric vehicle, a wirelessly charging small household appliance (e.g., a soymilk maker, a robot vacuum cleaner), a drone, and other electronic products. The embodiments of this application do not impose special limitations on the specific form of the aforementioned electronic device. For ease of explanation, the following description uses a mobile phone as shown in FIG1 as an example for electronic device 01.

[0049] To wirelessly charge the aforementioned electronic device 01, as shown in FIG1, the electronic device 01 includes a wireless charging receiver circuit 20 and a battery 50 connected to the wireless charging receiver circuit 20. For example, as shown in FIG2, the electronic device 01 mainly includes a display panel (DP) 10. The display panel 10 can be a liquid crystal display (LCD) screen or an organic light emitting diode (OLED) screen. This application does not limit this. The aforementioned electronic device 01 also includes a mid-frame 11 and a housing 12 as shown in FIG2. The display panel 10 and the housing 12 are located on opposite sides of the mid-frame 11, with the back of the display panel 10 facing the housing 12, and the display panel 10 and the housing 12 are connected through the mid-frame 11. The aforementioned wireless charging receiver circuit 20 and the battery 50 can be disposed on the surface of the mid-frame 11 facing the housing 12.

[0050] The charger 02 includes a wireless charging circuit 30 disposed within the charger 02 as shown in FIG. 1, and a power supply 40 connected to the wireless charging circuit 30. The power supply 40 is used to provide charging power. In some embodiments of this application, the power supply 40 can be a power adapter. The power supply 40 is capable of converting 220V AC power into DC power (e.g., 5V or 10V) according to the charging power requirements, and transmitting the DC power to the wireless charging circuit 30.

[0051] When the side of the electronic device 01 containing the housing 12 is placed on the charger 02, the wireless charging circuit 30, as shown in FIG3, includes a voltage converter 301 and an TX oscillation circuit 302 for wireless charging of the electronic device 01. The voltage converter 301 can be a direct current (DC) to alternating current (AC) converter, i.e., DC / AC. The wireless charging receiving circuit 20 also includes an RX oscillation circuit 201 and a rectifier circuit 202.

[0052] Based on this, voltage converter 301 is connected to power supply 40, and can convert the DC power output by power supply 40 into AC power. Furthermore, TX oscillation circuit 302 is connected to voltage converter 301. After receiving the AC power output by voltage converter 301, TX oscillation circuit 302 can generate an alternating magnetic field. RX oscillation circuit 201 receives the aforementioned alternating magnetic field and outputs AC power, thereby enabling the power of TX oscillation circuit 301 to be transferred to RX oscillation circuit 201.

[0053] Furthermore, the RX oscillation circuit 201 is connected to the rectifier circuit 202, which rectifies the AC power output to generate a rectified voltage Vrect. Based on this, the wireless charging receiver 20 also includes at least one voltage conversion circuit 203 connected to the rectifier circuit 202. This voltage conversion circuit 203 converts the rectified voltage Vrect into a charging voltage (e.g., 3.7V) for the battery 20. After this charging voltage is applied to both ends of the battery 50, the current output by the voltage conversion circuit 203 can charge the battery 50.

[0054] In some embodiments of this application, the voltage conversion circuit 203 includes a DC / DC conversion circuit. This DC / DC conversion circuit can be a buck converter or a switched capacitor (SC) circuit. The input-output voltage ratio of the buck converter can be flexibly adjusted; for example, the input-output voltage ratio can be set to a decimal. The input-output voltage ratio of the SC circuit is an integer, but the SC circuit can withstand a higher input-output voltage difference and has higher voltage conversion efficiency.

[0055] Furthermore, to control the charging process, wireless charging circuit 30 and wireless charging receiving circuit 20 can establish wireless communication. In this case, as shown in Figure 3, wireless charging circuit 30 may include a transmitter (TX) communication circuit 303, and wireless charging receiving circuit 20 may include a receiver (RX) communication circuit 204. The TX communication circuit 303 and RX communication circuit 204 can achieve wireless connection via Bluetooth, wireless-fidelity (WiFi), Zigbee, radio frequency identification (RFID), long-range (Lora) wireless technology, and near-field communication (NFC) technology, enabling wireless communication between wireless charging circuit 30 and wireless charging receiving circuit 20. In this way, TX communication circuit 303 and RX communication circuit 204 can transmit control signals or charging data. This charging data can be used to indicate the charging type. For example, the charging data can be a charging protocol, such as the Qi wireless charging standard launched by the Wireless Power Consortium (WPC), the BPP (basic power profile) protocol, or the EPP (extended power profile) protocol, etc.

[0056] This application provides a controller for a wireless charging device used to wirelessly charge electronic devices. The wireless charging device includes a resonant network, an inverter circuit, and the controller. The resonant network includes a resonant capacitor and a transmitting coil. The input terminal of the inverter circuit is connected to a DC power supply, and the output terminal of the inverter circuit is connected to the resonant network.

[0057] Referring to Figure 4, the controller is used for:

[0058] 01. Measure the first power loss, which is the coupling loss between the standard coil and the receiving coil of the electronic device when the electronic device is in a preset position on the standard coil;

[0059] In one possible implementation, the coupling loss includes the power loss of the ferrite in the transmitting coil that limits the magnetic field.

[0060] In one possible implementation, the coupling loss includes the power loss of the ferrite in the receiving coil that limits the magnetic field.

[0061] In one possible implementation, the coupling loss includes power loss in the metal components of the transmitting coil exposed to the magnetic field.

[0062] In one possible implementation, the coupling loss includes power loss in the metal components of the receiving coil exposed to the magnetic field.

[0063] In one possible implementation, the preset position and the actual position are specifically three-dimensional positions including the height direction.

[0064] The power loss of the power transmitter can include: power loss in the resonant circuit, power loss in the inverter, power loss in the ferrite that confines the magnetic field, and power loss in the metal components exposed to the magnetic field.

[0065] The power loss of the power receiver can include: power loss in the resonant circuit, power loss in the rectifier, power loss in the ferrite that confines the magnetic field, and power loss in the metal components exposed to the magnetic field.

[0066] 02. Based on the parameter relationship between the standard coil and the transmitting coil, and the relationship between the preset position and the actual position of the electronic device on the transmitting coil, the first power loss is converted into the actual coupling loss between the transmitting coil and the receiving coil when the electronic device is actually positioned on the transmitting coil;

[0067] 03. Based on the actual coupling loss, perform foreign object detection.

[0068] For example, a standard power transmitter, such as MP-A2, can be defined, and its coordinates (x, y, h) can be specified. The electronic device can then be placed at the specified location to measure the loss. Based on the direct conversion function between the standard power transmitter and the actual power transmitter, the loss measured in the previous step is converted to obtain the actual coupling loss.

[0069] This application defines a method for calculating wireless charging coupling loss, which more accurately calculates the overall power consumption during transmission and improves the accuracy of foreign object detection.

[0070] In one possible implementation, the controller is further configured to acquire a second power loss and a third power loss; the second power loss is the power loss of the resonant circuit and the inverter circuit itself, the first power loss is the coupling loss between the transmitting coil and the receiving coil in the electronic device, and the third power loss is the power loss of the resonant circuit and the rectifier circuit itself in the electronic device.

[0071] When the controller performs foreign object detection based on the actual coupling loss, it is specifically used for:

[0072] Based on the second power loss, the actual coupling loss, and the third power loss, the dissipation power of the foreign object between the wireless charging device and the electronic device is determined; based on the dissipation power, foreign object detection is performed.

[0073] For example, it can be calculated using the following formula:

[0074] Where Pi is the input power of the power transmitter, P0 is the output power of the power receiver, pt is the second power loss, pr is the third power loss, and pt&r is the actual coupling loss;

[0075] Referring to Figure 5, which is a flowchart of foreign object detection.

[0076] This application also provides an electronic device, including a controller as provided in any embodiment of this application, or including a power module as provided in any embodiment of this application.

[0077] In the foregoing embodiments, the method executed by the controller provided in the embodiments of this application has been described. To implement the functions of the methods provided in the embodiments of this application, the controller, as the execution subject, may include hardware structures and / or software modules, implementing the above functions in the form of hardware structures, software modules, or a combination of hardware structures and software modules. Whether a particular function is executed in the form of hardware structures, software modules, or a combination of hardware structures and software modules depends on the specific application and design constraints of the technical solution. It should be noted that the division of the various modules in the above device is merely a logical functional division; in actual implementation, they can be fully or partially integrated into a single physical entity, or physically separated. Furthermore, these modules can all be implemented in software through processing element calls; they can all be implemented in hardware; or some modules can be implemented in software through processing element calls, and some modules can be implemented in hardware. A separate processing element can be established, or it can be integrated into a chip in the above device. Alternatively, it can be stored in the memory of the above device as program code, and called and executed by a processing element of the above device. The implementation of other modules is similar. In addition, all or part of these modules can be integrated together, or they can be implemented independently. The processing element described herein can be an integrated circuit with signal processing capabilities. In implementation, each step or module of the above method can be completed through integrated logic circuits in the hardware of the processor element or through software instructions. For example, these modules can be one or more integrated circuits configured to implement the above method, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), or one or more field-programmable gate arrays (FPGAs). Furthermore, when a module is implemented through processing element scheduler code, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor capable of calling program code. Additionally, these modules can be integrated together as a system-on-a-chip (SOC).

[0078] In the above embodiments, the steps performed by the controller can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state disks (SSDs)).

[0079] This application also provides a computer-readable storage medium storing computer instructions that, when executed, can be used to perform any of the methods executed by a controller as described in the foregoing embodiments of this application.

[0080] This application also provides a chip for executing instructions, the chip being used to perform any of the methods executed by a controller as described above in this application.

[0081] This application also provides a computer program product, which includes a computer program stored in a storage medium. At least one processor can read the computer program from the storage medium, and when the at least one processor executes the computer program, it can implement any of the methods executed by the controller as described above in this application.

[0082] Those skilled in the art will understand that all or part of the steps of the above embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments; and the aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disk, or optical disk.

[0083] Those skilled in the art will understand that, for the purpose of illustrating the technical solution of this application, the embodiments of this application are described separately by functional modules, and the circuit devices in each module may partially or completely overlap, which is not intended to limit the scope of protection of this application.

[0084] 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 controller for use in wireless charging devices, characterized in that, The wireless charging device is used to wirelessly charge electronic devices. The wireless charging device includes: a resonant network, an inverter circuit, and a controller; the resonant network includes a resonant capacitor and a transmitting coil; the input terminal of the inverter circuit is used to connect to a DC power supply, and the output terminal of the inverter circuit is used to connect to the resonant network. The controller is used to measure a first power loss, which is the coupling loss between the standard coil and the receiving coil of the electronic device when the electronic device is in a preset position on the standard coil. The controller is further configured to convert the first power loss into the actual coupling loss between the transmitting coil and the receiving coil when the electronic device is in its actual position on the transmitting coil, based on the parameter relationship between the standard coil and the transmitting coil, and the relationship between the preset position and the actual position of the electronic device on the transmitting coil. The controller is also used to perform foreign object detection based on the actual coupling loss.

2. The controller according to claim 1, characterized in that, The controller is also used to acquire a second power loss and a third power loss; the second power loss is the power loss of the resonant circuit and the inverter circuit itself, the first power loss is the coupling loss between the transmitting coil and the receiving coil in the electronic device, and the third power loss is the power loss of the resonant circuit and the rectifier circuit itself in the electronic device. When the controller performs foreign object detection based on the actual coupling loss, it is specifically used for: Based on the second power loss, the actual coupling loss, and the third power loss, the dissipation power of the foreign object between the wireless charging device and the electronic device is determined; based on the dissipation power, foreign object detection is performed.

3. The controller according to claim 1 or 2, characterized in that, The coupling loss includes the power loss of the ferrite in the transmitting coil that limits the magnetic field.

4. The controller according to any one of claims 1 to 3, characterized in that, The coupling loss includes the power loss of the ferrite in the receiving coil that limits the magnetic field.

5. The controller according to any one of claims 1 to 4, characterized in that, The coupling loss includes the power loss in the metal components of the transmitting coil that are exposed to the magnetic field.

6. The controller according to any one of claims 1 to 5, characterized in that, The coupling loss includes the power loss in the metal components of the receiving coil that are exposed to the magnetic field.

7. The controller according to any one of claims 1 to 6, characterized in that, The preset position and the actual position are specifically three-dimensional positions including the height direction.

8. A control method, characterized in that, An application is provided in a wireless charging device for wirelessly charging electronic devices. The wireless charging device includes a resonant network, an inverter circuit, and a controller. The resonant network includes a transmitting coil. The input terminal of the inverter circuit is connected to a DC power supply, and the output terminal of the inverter circuit is connected to the resonant network. The method includes: Measure the first power loss, which is the coupling loss between the standard coil and the receiving coil of the electronic device when the electronic device is in a preset position on the standard coil; Based on the parameter relationship between the standard coil and the transmitting coil, and the relationship between the preset position and the actual position of the electronic device on the transmitting coil, the first power loss is converted into the actual coupling loss between the transmitting coil and the receiving coil when the electronic device is actually positioned on the transmitting coil; Foreign object detection is performed based on the actual coupling loss.

9. The method according to claim 8, characterized in that, The method further includes: Obtain the second power loss and the third power loss; the second power loss is the power loss of the resonant circuit and the inverter circuit itself, the first power loss is the coupling loss between the transmitting coil and the receiving coil in the electronic device, and the third power loss... The loss refers to the power loss of the resonant circuit and rectifier circuit in the electronic device itself. The foreign object detection based on the actual coupling loss includes: Based on the second power loss, the actual coupling loss, and the third power loss, the dissipation power of the foreign object between the wireless charging device and the electronic device is determined; based on the dissipation power, foreign object detection is performed.

10. The method according to claim 8 or 9, characterized in that, The coupling loss includes the power loss of the ferrite in the receiving coil that limits the magnetic field; or, the coupling loss includes the power loss of the ferrite in the receiving coil that limits the magnetic field.

11. The method according to any one of claims 8 to 10, characterized in that, The coupling loss includes the power loss in the metal components of the transmitting coil that are exposed to the magnetic field.

12. The method according to any one of claims 8 to 11, characterized in that, The coupling loss includes the power loss in the metal components of the receiving coil that are exposed to the magnetic field.

13. The method according to any one of claims 8 to 12, characterized in that, The preset position and the actual position are specifically three-dimensional positions including the height direction.

14. A power supply module, characterized in that, It includes a resonant network, an inverter circuit, and a controller according to any one of claims 1-7; the resonant network includes a transmitting coil; The input terminal of the inverter circuit is used to connect to a DC power supply, and the output terminal of the inverter circuit is used to connect to the resonant network.

15. An electronic device comprising a controller as claimed in any one of claims 1-7, or comprising a power module as claimed in claim 14.

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