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

Abstract

A controller applied to a wireless charging device. The controller is configured to measure a target parameter of a transmitting coil, wherein the target parameter is used for indicating the change of the relative position between an electronic device and the wireless charging device. The controller is further configured to stop power transmission to the electronic device and perform foreign object detection when the target parameter indicates that the relative position between the electronic device and the wireless charging device changes. The controller is further configured to resume power transmission to the electronic device when it is determined, by means of the foreign object detection, that there is no foreign object. By means of embodiments of the present application, the wireless charging device can be compatible with position movement and foreign object detection functions during power transmission, thereby ensuring the termination of power transmission due to position movement rather than the presence of a foreign object (in the present application, the power transmission is only temporarily interrupted and can be resumed).

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, wherein the resonant network includes a resonant capacitor and a transmitting coil;

[0007] 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.

[0008] The controller is configured to measure target parameters of the transmitting coil, the target parameters being used to indicate changes in the relative position between the electronic device and the wireless charging device;

[0009] The controller is further configured to stop power transmission to the electronic device and perform foreign object detection when the target parameter indicates a change in the relative position between the electronic device and the wireless charging device;

[0010] The controller is also configured to resume power transmission to the electronic device when the foreign object detection determines that there is no foreign object.

[0011] The embodiments of this application enable wireless charging devices to be compatible with position movement and foreign object detection functions during power transmission, ensuring that power transmission is not interrupted due to position movement rather than the presence of foreign objects (this application only requires a brief interruption and can be resumed).

[0012] Foreign object detection can be Q-value detection.

[0013] This application defines a high-precision Q-value detection process in power transmission, ensuring that power transmission is not affected by position changes, and more accurately calculates the Q-value before power transmission, thus improving the accuracy of foreign object detection.

[0014] In one possible implementation, the target parameter is a PLOSS parameter (e.g., input current and voltage) or an equivalent capacitance value.

[0015] In one possible implementation, the controller is further configured to continue power transmission to the electronic device when the updated quality factor meets the preset condition.

[0016] In one possible implementation, the controller, when resuming power transmission to the electronic device, is specifically configured to: update the transmission parameters and resume power transmission to the electronic device based on the updated transmission parameters.

[0017] In one possible implementation, the transmission parameters are the parameters of the calibration curve.

[0018] The calibration curve of the power transmitter is only valid when the position of the power receiver product remains unchanged within the working area. However, when the position or environment changes, the parameter curve needs to be refreshed.

[0019] In one possible implementation, the controller is further configured to: stop power transmission to the electronic device when the presence of a foreign object is determined by the foreign object detection.

[0020] 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 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;

[0021] The method includes:

[0022] The controller measures target parameters of the transmitting coil, which are used to indicate changes in the relative position between the electronic device and the wireless charging device.

[0023] When the target parameter indicates a change in the relative position between the electronic device and the wireless charging device, power transmission to the electronic device is stopped, and foreign object detection is performed.

[0024] Once the foreign object detection determines that there is no foreign object, power transmission to the electronic device is resumed.

[0025] In one possible implementation, the restoration of power transfer to the electronic device includes:

[0026] Update the transmission parameters and resume power transmission to the electronic device based on the updated transmission parameters.

[0027] In one possible implementation, the continued power transfer to the electronic device includes:

[0028] It determines whether the relative position between the transmitting coil and the receiving coil of the electronic device has changed, and updates the transmission parameters when a change occurs, and continues to transmit power to the electronic device according to the updated transmission parameters.

[0029] In one possible implementation, the transmission parameters are the parameters of the calibration curve.

[0030] In one possible implementation, the method further includes:

[0031] When the controller determines the presence of a foreign object through the foreign object detection, it stops transmitting power to the electronic device.

[0032] 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.

[0033] Fourthly, this application provides an electronic device including a controller as described in any of the first aspects of this application.

[0034] 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

[0035] Figure 1 is a schematic diagram of an electronic device provided in this application;

[0036] Figure 2 is another schematic diagram of an electronic device provided in this application;

[0037] Figure 3 is a schematic diagram of a power module provided in an embodiment of this application;

[0038] Figure 4 is a schematic diagram of a foreign object detection process provided in an embodiment of this application;

[0039] Figure 5 is a schematic diagram of the change in relative position;

[0040] Figure 6 is a schematic diagram of a foreign object detection process provided in an embodiment of this application. Detailed Implementation

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] Regarding Q-value detection (QFOD):

[0054] Q-value detection is a pre-power transmission process in the Qi standard. The Q-value is a measure of resonant cavity losses, defined as the ratio of the energy stored in the coil to the energy lost per cycle. In wireless charging systems, a small amount of energy is injected into the resonant cavity to generate a resonant current, and the Q-value is calculated by measuring the attenuation of this current. If a metallic foreign object exists between the transmitter (TX) and receiver (RX), the resonant cavity will absorb energy, resulting in a significantly lower measured Q-value (Qm) than the Q-value (Qr) reported by RX. By comparing Qm and Qr, the presence of a foreign object in the system can be determined.

[0055] Qi standard testing procedure: (1) Measure the reference value f of the resonant frequency and quality factor of the power transmitter (charging base). t and Q t (2) Measure the resonant frequency and quality factor f′ of the power receiver mobile phone. t and Q′ t(It needs to be placed together with the power transmitter (charging dock) for testing), (3) Measure the overall resonant frequency and quality factor reference value of the power receiver mobile phone and the power transmitter (charging dock). and (Note: The Qi standard does not specify the x, y, z positions of the phone when placed on the charging dock), (4) Simulate Ping to detect the presence of the Q value and calculate (5) Determine whether ΔQ is greater than the set threshold ΔQ(thr), and determine whether there is a foreign object based on the judgment result to decide whether to transmit power.

[0056] Regarding power loss detection (PLOSS FOD):

[0057] Power loss detection is a procedure in the Qi standard for power transmission. It involves measuring the input power (PIn) at the transmitter and the output power (POut) at the receiver to calculate the power loss (PLoss). The presence of metallic foreign objects in the transmission magnetic field will cause additional losses. The presence of foreign objects can be determined by comparing the actual measured PLoss value with a preset threshold.

[0058] Qi standard testing process: PLoss FOD continuously monitors power transmission and is applicable to BPP (Baseline Power Profile) and EPP standards. (1) Calculate internal losses and measure power losses in the power transmitter resonant circuit and inverter. Simultaneously measure the power loss in the power receiver resonant circuit and rectifier. (2) Calculate the power dissipated by the foreign object. P i P represents the input power of the power transmitter. o The output power of the power receiver (3) will be P FO With the set power loss threshold ΔP r Comparison to determine the presence of foreign objects (Note: threshold ΔP) r The magnitude of the main Ploss or capacitance change is used to determine this.

[0059] The current wireless charging WPC Qi standard is only suitable for charging power below 15W. At higher power levels, it is inaccurate in detecting foreign objects, posing a safety risk. During power transmission, if the receiver's position changes or a foreign object enters, charging will be interrupted, affecting the user experience. Furthermore, the calibration curve of the power transmitter is only effective if the receiver's position remains unchanged during charging; otherwise, charging will fail when the position or environment changes.

[0060] To address the aforementioned issues, this application provides a controller for a wireless charging device. The wireless charging device is used to wirelessly charge electronic devices and 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.

[0061] Referring to Figure 4, the controller is used for:

[0062] 1. By measuring the target parameters of the transmitting coil, the target parameters are used to indicate the change in the relative position between the electronic device and the wireless charging device;

[0063] 2. When the target parameter indicates a change in the relative position between the electronic device and the wireless charging device, power transmission to the electronic device is stopped, and foreign object detection is performed;

[0064] 3. Once the foreign object detection confirms the absence of foreign objects, power transmission to the electronic device is resumed.

[0065] The embodiments of this application enable wireless charging devices to be compatible with position movement and foreign object detection functions during power transmission, ensuring that power transmission is not interrupted due to position movement rather than the presence of foreign objects (this application only requires a brief interruption and can be resumed).

[0066] Foreign object detection can be Q-value detection.

[0067] This application defines a high-precision Q-value detection process in power transmission, ensuring that power transmission is not affected by position changes, and more accurately calculates the Q-value before power transmission, thus improving the accuracy of foreign object detection.

[0068] In one possible implementation, the target parameter is a PLOSS parameter (e.g., input current and voltage) or an equivalent capacitance value.

[0069] In one possible implementation, the controller is further configured to continue power transmission to the electronic device when the updated quality factor meets the preset condition.

[0070] In one possible implementation, the controller, when resuming power transmission to the electronic device, is specifically configured to: update the transmission parameters and resume power transmission to the electronic device based on the updated transmission parameters.

[0071] In one possible implementation, the transmission parameters are the parameters of the calibration curve.

[0072] The calibration curve of the power transmitter is only valid when the position of the power receiver product remains unchanged within the working area. However, when the position or environment changes, the parameter curve needs to be refreshed.

[0073] In one possible implementation, the controller is further configured to: stop power transmission to the electronic device when the presence of a foreign object is determined by the foreign object detection.

[0074] Refer to Figure 5, which illustrates the change in position.

[0075] Referring to Figure 6, which is a flowchart of foreign object detection.

[0076] This application also provides an electronic device, including a controller 114 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 114 provided in this application embodiment has been described. To implement the functions of the methods provided in the above embodiments, the controller 114, 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, while others are 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 as program code in the memory of the above device, and called and executed by a processing element of the above device. The implementation of other modules is similar. Furthermore, these modules can be integrated, either wholly or partially, or implemented independently. The processing element described here can be an integrated circuit with signal processing capabilities. During implementation, each step of the above method or each of the above modules 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), etc. As another example, 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. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0078] In the above embodiments, the steps performed by the controller 114 can be implemented, in whole or in part, by software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as 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 the controller 114 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 the controller 114 as described above.

[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. When the at least one processor executes the computer program, it can implement any of the methods executed by the controller 114 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, and 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 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 configured to measure target parameters of the transmitting coil, the target parameters being used to indicate changes in the relative position between the electronic device and the wireless charging device; The controller is further configured to stop power transmission to the electronic device and perform foreign object detection when the target parameter indicates a change in the relative position between the electronic device and the wireless charging device; The controller is also configured to resume power transmission to the electronic device when the foreign object detection determines that there is no foreign object.

2. The controller according to claim 1, characterized in that, The target parameter is the PLOSS parameter or an equivalent capacity value.

3. The controller according to claim 1 or 2, characterized in that, When resuming power transmission to the electronic device, the controller is specifically configured to: update the transmission parameters and resume power transmission to the electronic device based on the updated transmission parameters.

4. The controller according to any one of claims 1 to 3, characterized in that, The transmission parameters are those of the calibration curve.

5. The controller according to any one of claims 1 to 4, characterized in that, The controller is further configured to: stop power transmission to the electronic device when the presence of a foreign object is determined by the foreign object detection.

6. 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 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. The method includes: The controller measures target parameters of the transmitting coil, which are used to indicate changes in the relative position between the electronic device and the wireless charging device. When the target parameter indicates a change in the relative position between the electronic device and the wireless charging device, power transmission to the electronic device is stopped, and foreign object detection is performed. Once the foreign object detection determines that there is no foreign object, power transmission to the electronic device is resumed.

7. The method according to claim 6, characterized in that, The restoration of power transmission to the electronic device includes: Update the transmission parameters and resume power transmission to the electronic device based on the updated transmission parameters.

8. The method according to claim 6 or 7, characterized in that, The transmission parameters are those of the calibration curve.

9. The method according to any one of claims 6 to 8, characterized in that, The method further includes: When the controller determines the presence of a foreign object through the foreign object detection, it stops transmitting power to the electronic device.

10. A power supply module, characterized in that, It includes a resonant network, an inverter circuit, and a controller according to any one of claims 1-5; 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.

11. An electronic device comprising a controller as described in any one of claims 1-5, or comprising a power module as described in claim 10.

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