Wireless charging method and system for detecting foreign matter during wireless charging

Abstract

Wireless charging methods and systems are provided that detect a foreign object by measuring a Q factor based on a predefined packet and transmission sequence while a wireless charging transmitting device transmits power. An electronic device includes a battery, a coil, a wireless charging reception circuit, a power management module configured to control a state of charge of the battery using a voltage supplied from the wireless charging reception circuit, and a processor configured to receive power from a wireless charging transmitting device through the coil, determine whether a predetermined condition is satisfied while charging the battery using the received power, and transmit a foreign object detection request packet to the wireless charging transmitting device in response to determining that the predetermined condition is satisfied.

Description

Technical Field

[0001] This disclosure generally relates to a wireless charging method and system for detecting foreign objects during wireless charging, and more specifically, to a wireless charging method and system for detecting foreign objects by measuring the Q-factor (quality factor) based on predefined groups and transmission sequences when a wireless charging transmission device is transmitting power. Background Technology

[0002] Wireless charging technology, or contactless charging technology, has been developed and applied to various electronic devices.

[0003] Wireless charging technology is used to charge electronic devices without a physical connection between the battery and a wired charger. For example, wireless charging can charge a battery by placing a smartphone or wearable device on a charging pad or charging tray. Summary of the Invention

[0004] Technical issues

[0005] However, when using wireless charging technology, foreign objects may exist between the wireless power transmitter (Tx) device and the wireless power receiver (Rx) device, which can reduce the efficiency of wireless charging and may generate heat, which can be dangerous, for example, by starting a fire or burning the user.

[0006] Therefore, conventional wireless charging technology should be improved to accurately detect foreign objects during wireless charging.

[0007] Solution to the problem

[0008] This disclosure is made to at least address the aforementioned disadvantages and to provide at least the advantages described below.

[0009] One aspect of the present invention is to provide a wireless charging method and system for accurately detecting the presence of foreign objects during wireless charging.

[0010] Another aspect of the present invention is to provide a wireless charging method and system that prevents safety hazards by accurately detecting foreign objects during wireless charging.

[0011] Another aspect of this disclosure is to provide a wireless charging method and system that maintains the wireless power receiving device charging the battery even during foreign object detection operations, thereby increasing user peace of mind and convenience.

[0012] According to an aspect of this disclosure, an electronic device is provided. The electronic device includes: a battery; a coil; a wireless charging receiving circuit; a power management module configured to control the charging state of the battery using a voltage supplied from the wireless charging receiving circuit; and a processor configured to: receive power from a wireless charging transmitter via the coil; determine whether the predetermined conditions are met when using the received power to charge the battery; and, in response to determining that the predetermined conditions are met, transmit a foreign object detection request packet to the wireless charging transmitter.

[0013] According to another aspect of this disclosure, an apparatus for performing wireless charging transmission is provided. The apparatus includes: a transmitting coil; a wireless charging transmitting circuit; and a controller configured to: configure charging based on exchanging at least one predetermined packet with a detected wireless charging receiver; transmit power to the detected wireless charging receiver based on the configured charging; temporarily stop transmitting power in response to receiving a foreign object detection request packet from the wireless charging receiver while transmitting the power; detect the presence of a foreign object based on the resonant characteristics of the transmitting coil while temporarily stopping the power transmission; completely stop transmitting the power in response to detecting the presence of a foreign object; and restart the power transmission in response to detecting the absence of a foreign object.

[0014] According to another aspect of this disclosure, a method for performing wireless charging by an electronic device is provided. The method includes: receiving power from a wireless charging transmitter; determining whether predetermined conditions are met when using the received power to charge a battery; and transmitting a foreign object detection request packet to the wireless charging transmitter in response to determining that the predetermined conditions are met.

[0015] Advantages of the invention

[0016] According to various embodiments of this disclosure, a wireless charging method and system for accurately detecting the presence of foreign objects during wireless charging are provided.

[0017] According to various embodiments of this disclosure, a wireless charging method and system are provided to prevent safety hazards by accurately detecting foreign objects during wireless charging.

[0018] According to various embodiments of this disclosure, a wireless charging method and system are provided that maintains the wireless power receiving device charging the battery even during operations involving foreign object detection, thereby increasing user peace of mind and convenience. Attached Figure Description

[0019] The above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the accompanying drawings and the following detailed description, wherein:

[0020] Figure 1 An electronic device in a network environment according to an embodiment is shown;

[0021] Figure 2 A power management module and a battery according to an embodiment are shown;

[0022] Figure 3 A wireless charging system according to an embodiment is shown;

[0023] Figure 4 A wireless charging system according to an embodiment is shown;

[0024] Figure 5A This is a diagram illustrating the operation of a wireless charging system according to an embodiment;

[0025] Figure 5B This is a diagram illustrating the operation of a wireless charging system according to an embodiment;

[0026] Figure 6 This is a flowchart illustrating the operation of the Tx device according to an embodiment;

[0027] Figure 7 This is a flowchart illustrating the operation of the Rx device according to an embodiment;

[0028] Figure 8 This is a graph showing the voltage supplied to the power management integrated circuit (PMIC) of the Rx device during wireless charging according to an embodiment;

[0029] Figure 9 This is a graph showing the Q value of the transmitting coil obtained before the Tx device transmits power according to an embodiment;

[0030] Figure 10 This is a graph showing the Q value of the transmitting coil when the Tx device is emitting power and there are no foreign objects, according to an embodiment; and

[0031] Figure 11 This is a graph showing the Q value of the transmitting coil when the Tx device is transmitting power and a foreign object is present, according to an embodiment. Detailed Implementation

[0032] Various embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. In the following description, only specific details such as detailed configurations and components are provided to aid in a comprehensive understanding of these embodiments. Therefore, it will be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Furthermore, for clarity and brevity, descriptions of well-known functions and constructions have been omitted.

[0033] Figure 1This is a block diagram illustrating an electronic device 101 in a network environment 100 according to various embodiments.

[0034] Reference Figure 1 In network environment 100, electronic device 101 can communicate with electronic device 102 via a first network 198 (e.g., a short-range wireless communication network), or with electronic device 104 or server 108 via a second network 199 (e.g., a long-range wireless communication network). According to an embodiment, electronic device 101 can communicate with electronic device 104 via server 108. According to an embodiment, electronic device 101 may include a processor 120, memory 130, input module 150, sound output module 155, display module 160, audio module 170, sensor module 176, interface 177, connection terminal 178, haptic module 179, camera module 180, power management module 188, battery 189, communication module 190, user identification module (SIM) 196, or antenna module 197. In some embodiments, at least one of these components (e.g., connection terminal 178) may be omitted from electronic device 101, or one or more other components may be added to electronic device 101. In some embodiments, some components (e.g., sensor module 176, camera module 180, antenna module 197) may be implemented as a single component (display module 160).

[0035] Processor 120 may run software (e.g., program 140) to control at least one other component (e.g., hardware or software component) of electronic device 101 connected to processor 120, and may perform various data processing or calculations. According to one embodiment, as at least part of the data processing or calculation, processor 120 may store commands or data received from another component (e.g., sensor module 176 or communication module 190) in volatile memory 132, process the commands or data stored in volatile memory 132, and store the result data in non-volatile memory 134. According to an embodiment, processor 120 may include a main processor 121 (e.g., central processing unit (CPU) or application processor (AP)) and auxiliary processors 123 (e.g., graphics processing unit (GPU), neural processing unit (NPU), image signal processor (ISP), sensor central processor, or communication processor (CP)) that are operationally independent of or combined with the main processor 121. For example, when electronic device 101 includes a main processor 121 and an auxiliary processor 123, the auxiliary processor 123 may be adapted to consume less power than the main processor 121, or to be specifically used for a designated function. The auxiliary processor 123 may be implemented separately from the main processor 121, or may be implemented as part of the main processor 121.

[0036] When the main processor 121 is inactive (e.g., in sleep mode), the auxiliary processor 123 (rather than the main processor 121) can control at least some of the functions or states associated with at least one component of the electronic device 101 (e.g., display module 160, sensor module 176, or communication module 190), or when the main processor 121 is active (e.g., running an application), the auxiliary processor 123 can work with the main processor 121 to control at least some of the functions or states associated with at least one component of the electronic device 101 (e.g., display module 160, sensor module 176, or communication module 190). According to embodiments, the auxiliary processor 123 (e.g., an image signal processor or a communication processor) can be implemented as part of another component (e.g., camera module 180 or communication module 190) functionally associated with the auxiliary processor 123.

[0037] According to an embodiment, the auxiliary processor 123 (e.g., a neural processing unit) may include hardware structures specified for processing an artificial intelligence model. The artificial intelligence model can be generated through machine learning. This learning may be performed, for example, by an electronic device 101 performing artificial intelligence or via a separate server (e.g., server 108). The learning algorithm may include, but is not limited to, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning. The artificial intelligence model may include multiple layers of artificial neural networks. The artificial neural networks may be, but are not limited to, deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted Boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), deep Q-networks, or combinations of two or more of these. In addition to the hardware structures, the artificial intelligence model may additionally or alternatively include software structures.

[0038] Memory 130 may store various data used by at least one component of electronic device 101 (e.g., processor 120 or sensor module 176). The various data may include, for example, software (e.g., program 140) and input or output data for commands associated with it. Memory 130 may include volatile memory 132 or non-volatile memory 134.

[0039] The program 140 may be stored as software in the memory 130, and the program 140 may include, for example, an operating system (OS) 142, middleware 144, or application 146.

[0040] Input device 150 can receive commands or data from outside electronic device 101 (e.g., a user) that will be used by other components of electronic device 101 (e.g., processor 120). Input device 150 may include, for example, a microphone, mouse, keyboard, keys (e.g., buttons), or digital pen (e.g., stylus).

[0041] The sound output module 155 can output sound signals to the outside of the electronic device 101. The sound output module 155 may include, for example, a speaker or a receiver. The speaker can be used for general purposes such as playing multimedia or playing records, and the receiver can be used for incoming calls. According to an embodiment, the receiver may be implemented separately from the speaker or as part of the speaker.

[0042] Display module 160 can visually provide information to the outside of electronic device 101 (e.g., to a user). Display device 160 may include, for example, a display, a holographic device, or a projector, and control circuitry for controlling a respective one of the display, holographic device, and projector. According to an embodiment, display module 160 may include touch circuitry adapted to detect touch or a pressure sensor adapted to measure the intensity of the force caused by touch.

[0043] The audio module 170 can convert sound into electrical signals and vice versa. According to an embodiment, the audio module 170 can obtain sound via the input module 150, or output sound via the sound output module 155 or headphones of an external electronic device (e.g., electronic device 102) that is directly (e.g., wired) or wirelessly connected to the electronic device 101.

[0044] Sensor module 176 can detect the operating state of electronic device 101 (e.g., power or temperature) or the environmental state outside electronic device 101 (e.g., user state), and then generate an electrical signal or data value corresponding to the detected state. According to embodiments, sensor module 176 may include, for example, a gesture sensor, gyroscope sensor, atmospheric pressure sensor, magnetic sensor, accelerometer, grip sensor, proximity sensor, color sensor, infrared (IR) sensor, biometric sensor, temperature sensor, humidity sensor, or illuminance sensor.

[0045] Interface 177 may support one or more specific protocols used to enable electronic device 101 to connect directly (e.g., wired) or wirelessly to external electronic devices (e.g., electronic device 102). According to embodiments, interface 177 may include, for example, a High Definition Multimedia Interface (HDMI), a Universal Serial Bus (USB) interface, a Secure Digital Card (SD) interface, or an audio interface.

[0046] Connection end 178 may include a connector, through which electronic device 101 can be physically connected to an external electronic device (e.g., electronic device 102). According to embodiments, connection end 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0047] The tactile module 179 can convert electrical signals into mechanical stimuli (e.g., vibration or motion) or electrical stimuli that can be recognized by a user through his touch or kinesthesia. According to embodiments, the tactile module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulator.

[0048] Camera module 180 can capture still or moving images. According to an embodiment, camera module 180 may include one or more lenses, an image sensor, an image signal processor, or a flash.

[0049] The power management module 188 manages the power supply to the electronic device 101. According to an embodiment, the power management module 188 may be implemented as at least part of, for example, a power management integrated circuit (PMIC).

[0050] Battery 189 can power at least one component of electronic device 101. According to an embodiment, battery 189 may include, for example, a non-rechargeable primary battery, a rechargeable rechargeable battery, or a fuel cell.

[0051] Communication module 190 can support the establishment of a direct (e.g., wired) or wireless communication channel between electronic device 101 and external electronic devices (e.g., electronic device 102, electronic device 104, or server 108), and perform communication via the established communication channel. Communication module 190 may include one or more communication processors capable of operating independently of processor 120 (e.g., application processor (AP)) and support direct (e.g., wired) or wireless communication. According to embodiments, communication module 190 may include wireless communication module 192 (e.g., cellular communication module, short-range wireless communication module, or Global Navigation Satellite System (GNSS) communication module) or wired communication module 194 (e.g., local area network (LAN) communication module or power line communication (PLC) module). One of these communication modules can communicate with an external electronic device via a first network 198 (e.g., a short-range communication network such as Bluetooth, Wi-Fi Direct, or Infrared Data Association (IrDA)) or a second network 199 (e.g., a long-range communication network such as a traditional cellular network, 5G network, next-generation communication network, the Internet, or a computer network (e.g., a LAN or a wide area network (WAN))). These various types of communication modules can be implemented as a single component (e.g., a single chip) or as multiple components (e.g., multiple chips) that are separate from each other. The wireless communication module 192 can identify and verify the electronic device 101 in the communication network (such as the first network 198 or the second network 199) using user information (e.g., the International Mobile Subscriber Identity (IMSI)) stored in the user identification module 196.

[0052] Wireless communication module 192 can support 5G networks and next-generation communication technologies beyond fourth-generation (4G) networks, such as new radio (NR) access technologies. NR access technologies can support enhanced mobile broadband (eMBB), massive machine-type communications (mMTC), or ultra-reliable low-latency communications (URLLC). Wireless communication module 192 can support high-frequency bands (e.g., millimeter-wave bands) to achieve, for example, high data transmission rates. Wireless communication module 192 can support various technologies used to ensure performance in high-frequency bands, such as, for example, beamforming, massive MIMO, full-dimensional (FD)-MIMO, array antennas, analog beamforming, or massive MIMO. Wireless communication module 192 can support various requirements specified in electronic device 101, external electronic devices (e.g., electronic device 104), or network systems (e.g., second network 199). According to an embodiment, the wireless communication module 192 may support peak data rates (e.g., 20 Gbps or higher) for implementing eMBB, lost coverage (e.g., 164 dB or less) for implementing mMTC, or U-plane latency (e.g., 0.5 ms or less for each of the downlink (DL) and uplink (UL), or 1 ms or less for the round trip) for implementing URLLC.

[0053] Antenna module 197 can transmit or receive signals or power to or from the exterior of electronic device 101 (e.g., external electronic device). According to an embodiment, antenna module 197 may include an antenna comprising a radiating element formed of a conductive material or conductive pattern formed in or on a substrate (e.g., a PCB). According to an embodiment, antenna module 197 may include multiple antennas (e.g., an array antenna). In this case, at least one antenna suitable for a communication scheme used in a communication network (such as a first network 198 or a second network 199) can be selected from the multiple antennas by, for example, communication module 190 (e.g., wireless communication module 192). Signals or power can then be transmitted or received between communication module 190 and the external electronic device via the selected at least one antenna. According to an embodiment, additional components besides the radiating element (e.g., a radio frequency integrated circuit (RFIC)) may be additionally incorporated into antenna module 197.

[0054] According to various embodiments, antenna module 197 may form a millimeter-wave antenna module. According to embodiments, the millimeter-wave antenna module may include a printed circuit board, an RFIC disposed on or adjacent to a first surface (e.g., bottom surface) of the printed circuit board and capable of supporting a specified high-frequency band (e.g., millimeter-wave band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., top surface or side surface) of the printed circuit board and capable of transmitting or receiving signals in the specified high-frequency band.

[0055] At least some of the aforementioned components can be interconnected and communicate signals (e.g., commands or data) between them via an inter-peripheral communication scheme (e.g., bus, general purpose input / output (GPIO), serial peripheral interface (SPI), or mobile industrial processor interface (MIPI)).

[0056] According to an embodiment, commands or data can be sent or received between electronic device 101 and external electronic device 104 via server 108 connected to a second network 199. Each of electronic device 102 and electronic device 104 can be a device of the same type as electronic device 101, or a device of a different type. According to an embodiment, all or some operations that would be performed on electronic device 101 can be performed on one or more of external electronic devices 102, external electronic devices 104, or server 108. For example, if electronic device 101 is required to automatically perform a function or service, or is required to perform a function or service in response to a request from a user or another device, electronic device 101 may request the one or more external electronic devices to perform at least a portion of the function or service, instead of running the function or service, or electronic device 101 may request the one or more external electronic devices to perform at least a portion of the function or service in addition to running the function or service. Upon receiving the request, the one or more external electronic devices may perform at least a portion of the requested function or service, or perform additional functions or services related to the request, and transmit the result of the execution to electronic device 101. Electronic device 101 may provide the result as at least a partial response to the request, with or without further processing. For this purpose, technologies such as cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing may be used. Electronic device 101 may use, for example, distributed computing or mobile edge computing to provide ultra-low latency services. In another embodiment, external electronic device 104 may include an Internet of Things (IoT) device. Server 108 may be an intelligent server using machine learning and / or neural networks. According to an embodiment, external electronic device 104 or server 108 may be included in a second network 199. Electronic device 101 may be applied to intelligent services based on 5G communication technology or IoT-related technologies (e.g., smart homes, smart cities, smart cars, or healthcare).

[0057] The electronic device according to various embodiments can be one of a variety of types of electronic devices. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. According to embodiments of this disclosure, the electronic device is not limited to those described above.

[0058] It should be understood that the various embodiments of this disclosure and the terminology used therein are not intended to limit the technical features set forth herein to the specific embodiments, but rather to include various changes, equivalents, or substitutions to the respective embodiments. In the description of the drawings, similar reference numerals may be used to refer to similar or related elements. It will be understood that nouns in the singular form corresponding to terms may include one or more things unless the relevant context clearly indicates otherwise. As used herein, each of the phrases such as “A or B,” “at least one of A and B,” “at least one of A or B,” “A, B, or C,” “at least one of A, B, and C,” and “at least one of A, B, or C” may include any one or all possible combinations of the items enumerated together with the corresponding phrase among the plurality of phrases. As used herein, terms such as “first” and “second” or “first” and “second” may be used to simply distinguish the respective component from another component and do not limit the component in other respects (e.g., importance or order). It will be understood that, whether the terms “operably” or “communically” are used or not, if an element (e.g., a first element) is referred to as “combined with another element (e.g., a second element),” “combined to another element (e.g., a second element),” “connected to another element (e.g., a second element),” or “attached to another element (e.g., a second element)”, it means that the first element can be directly (e.g., wiredly) connected to the second element, wirelessly connected to the second element, or connected to the second element via a third element.

[0059] As used herein, the term "module" can include a unit implemented in hardware, software, or firmware, and is used interchangeably with other terms (e.g., "logic," "logic block," "part," or "circuit"). A module can be a single integrated component adapted to perform one or more functions, or the smallest unit or part of such a single integrated component. For example, according to an embodiment, a module can be implemented in the form of an application-specific integrated circuit (ASIC).

[0060] The various embodiments set forth herein can be implemented as software (e.g., program 140) containing one or more instructions readable by a machine (e.g., electronic device 101) stored in a storage medium (e.g., internal memory 136 or external memory 138). For example, under the control of a processor, the processor (e.g., processor 120) of the machine (e.g., electronic device 101) can invoke and execute at least one of the one or more instructions stored in the storage medium, with or without the use of one or more other components. This enables the machine to operate to perform at least one function according to the invoked at least one instruction. The one or more instructions may include code generated by a compiler or code executable by an interpreter. Machine-readable storage media may be provided in the form of non-transitory storage media. The term "non-transitory" means only that the storage medium is a tangible device and does not include signals (e.g., electromagnetic waves), but this term does not distinguish between data being stored semi-permanently in the storage medium and data being temporarily stored in the storage medium.

[0061] According to embodiments, methods according to various embodiments of this disclosure may be included and provided in a computer program product. The computer program product can be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disk read-only memory (CD-ROM)) or via an app store (e.g., the Play Store). TM The computer program product may be published online (e.g., downloaded or uploaded), or may be distributed directly between two user devices (e.g., smartphones) (e.g., downloaded or uploaded). If published online, at least a portion of the computer program product may be temporarily generated, or at least a portion of the computer program product may be temporarily stored in a machine-readable storage medium (such as the memory of a manufacturer's server, an app store's server, or a forwarding server).

[0062] According to various embodiments, each of the above-described components (e.g., a module or program) may include a single entity or multiple entities. According to various embodiments, one or more of the above-described components may be omitted, or one or more other components may be added. Optionally or additionally, multiple components (e.g., modules or programs) may be integrated into a single component. In this case, according to various embodiments, the integrated component may still perform the one or more functions of each of the multiple components in the same or similar manner as the corresponding component of the multiple components performed one or more functions prior to integration. According to various embodiments, the operations performed by a module, program, or other component may be performed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be run in a different order or omitted, or one or more other operations may be added.

[0063] Figure 2 The diagram illustrates a power management module and battery according to various embodiments.

[0064] Reference Figure 2 Power management module (such as) Figure 1 The power management module 188 may include a charging circuit 210, a power regulator 220, or a power meter 230. The charging circuit 210 can charge the battery (e.g., using power supplied from an external power source outside the electronic device 101) by using power from an external power source. Figure 1 The battery 189 is charged. According to an embodiment, the charging circuit 210 can select a charging scheme (e.g., normal charging or fast charging) based at least in part on the type of external power source (e.g., power outlet, USB, or wireless charging), the power value that the external power source can provide (e.g., approximately 20 watts or more), or the properties of the battery 189, and can use the selected charging scheme to charge the battery 189. The external power source can be directly connected to the electronic device 101, for example, via connection terminal 178 or wirelessly connected to the electronic device 101 via antenna module 197.

[0065] Power regulator 220 can generate various electrical powers with different voltage or current levels by adjusting the voltage or current level of the power supplied from an external power source or battery 189. Power regulator 220 can regulate the voltage or current level of the power supplied from the external power source or battery 189 to different voltage or current levels suitable for each of the components included in electronic device 101. According to embodiments, power regulator 220 can be implemented in the form of a low-dropout (LDO) regulator or a switching regulator. Power meter 230 can measure usage status information about battery 189 (e.g., battery capacity, number of charge or discharge cycles, voltage, or temperature).

[0066] The power management module 188 may use, for example, a charging circuit 210, a power regulator 220, or a power meter 230, to determine charging status information (e.g., lifespan, overvoltage, undervoltage, overcurrent, overcharge, overdischarge, overheating, short circuit, or swelling) related to the charging of the battery 189, at least in part based on measured usage status information about the battery 189. The power management module 188 may determine whether the state of the battery 189 is normal or abnormal based at least in part on the determined charging status information. If the state of the battery 189 is determined to be abnormal, the power management module 188 may regulate the charging of the battery 189 (e.g., reduce the charging current or voltage, or stop charging). According to embodiments, at least some of the functions of the power management module 188 may be performed by an external control device (e.g., a processor 120).

[0067] According to an embodiment, battery 189 may include a protection circuit module (PCM) 240. PCM 240 may perform one or more functions (e.g., pre-cut-off function) to prevent performance degradation or damage to battery 189. Additionally or alternatively, PCM 240 may be configured as at least part of a battery management system (BMS), wherein the BMS is capable of performing various functions including cell balancing, battery capacity measurement, charge or discharge count, temperature measurement, or voltage measurement.

[0068] According to embodiments, at least a portion of the charging status information or usage status information of the battery 189 can be measured using a corresponding sensor of the sensor module 176 (e.g., a temperature sensor), the power meter 230, or the power management module 188. According to embodiments, the corresponding sensor of the sensor module 176 (e.g., a temperature sensor) may be included as part of the PCM 240 or may be arranged as a separate device near the battery 189.

[0069] Figure 3 A wireless charging system according to an embodiment is shown.

[0070] refer to Figure 3 The wireless charging system includes a Tx device 302 and an Rx device 301.

[0071] Tx device 302 may be a charging board for transmitting wireless power based on power supplied from a charger (e.g., a travel adapter (TA)), or it may be an electronic device with wireless power transmission capabilities.

[0072] Rx device 301 can be an electronic device such as a smartphone or wearable device.

[0073] Figure 4 A wireless charging system according to an embodiment is shown.

[0074] refer to Figure 4 The wireless charging system includes a Tx device 302 and an Rx device 301. When the Rx device 301 is placed on the Tx device 302, the Tx device 302 can wirelessly supply power to the Rx device 301.

[0075] The Tx device 302 includes a power transmission circuit 311, a control circuit 312, a communication circuit 313, and a sensing circuit 314.

[0076] The power transmission circuit 311 includes: a power adapter 311a for receiving power (or electricity) from an external source and appropriately converting the voltage of the input power source; a power generation circuit 311b for generating electricity; and a matching circuit 311c for maximizing the efficiency between the transmitting coil 311L and the receiving coil 321L.

[0077] The power transmission circuit 311 may include multiple power adapters 311a, power generation circuit 311b, transmitting coil 311L and / or matching circuit 311c to transmit power to multiple Rx devices.

[0078] Control circuit 312 can perform overall control of Tx device 302, generate various messages for wireless power transmission, and transmit these messages to communication circuit 313. Control circuit 312 can calculate the power (or electrical force) to be transmitted to Rx device 301 based on the information received from communication circuit 313. Control circuit 312 can control power transmission circuit 311 so that the power generated by transmission coil 311L is transmitted to Rx device 301.

[0079] The communication circuit 313 includes a first communication circuit 313a and a second communication circuit 313b. The first communication circuit 313a can communicate with the first communication circuit 323a of the Rx device 301 via a frequency that is the same as or adjacent to the frequency used by the transmitting coil 311L for power transmission (e.g., in-band).

[0080] The first communication circuit 313a can communicate with the first communication circuit 323a of the Rx device 301 using the transmitting coil 311L. The transmitting coil 311L can be used to transmit data (or communication signals) generated by the first communication signal 313a. The first communication circuit 313a can transmit data to the Rx device 301 using a frequency shift keying (FSK) modulation scheme. The first communication circuit 313a can communicate with the first communication circuit 323a of the Rx device 301 by changing the frequency of the power signal transmitted through the transmitting coil 311L. Alternatively, the first communication circuit 313a can communicate with the first communication circuit 323a of the Rx device 301 by inserting data into the power signal generated by the power generation circuit 311b. For example, the first communication circuit 313a can express data by increasing or decreasing the frequency of the power transmission signal.

[0081] The second communication circuit 313b can communicate with the second communication circuit 323b of the Rx device 301 via a frequency different from the frequency used by the transmitting coil 311L for power transmission (e.g., out-of-band). The second communication circuit 313b can obtain information related to the charging state (e.g., voltage value after rectifier, rectified voltage value (Vrect) information, or information about the current (Iout) flowing in the coil 321L or rectifier circuit 321b, various packets and / or messages) from the second communication circuit 323b via various short-range communication schemes such as Bluetooth, Bluetooth Low Energy (BLE), Wi-Fi and Near Field Communication (NFC).

[0082] The sensing circuit 314 may include one or more sensors, and one or more sensors may be used to detect at least one state of the power transmitting device 301.

[0083] The sensing circuit 314 may include at least one of a temperature sensor, a motion sensor, or a current (or voltage) sensor. The temperature sensor detects the temperature of the Tx device 302, the motion sensor detects the motion state of the Tx device 302, and the current (or voltage) sensor detects the state of the output signal of the Tx device 302, such as the magnitude of the current, the magnitude of the voltage, or the magnitude of the power.

[0084] A current (or voltage) sensor can measure signals in the power transmitting circuit 311. The current (or voltage) sensor can measure signals in at least some areas of the matching circuit 311c or the power generating circuit 311b. The current (or voltage) sensor may include circuitry for measuring signals at the front end of the coil 311L.

[0085] The sensing circuit 314 can detect foreign objects (e.g., perform foreign object detection (FOD)).

[0086] Rx device 301 includes a power receiving circuit 321, a processor 322, a communication circuit 323, at least one sensor 324, a display 325, and a sensing circuit 326. Descriptions of the components of Rx device 301 corresponding to those of Tx device 302 are omitted.

[0087] The power receiving circuit 321 includes a receiving coil 321L for wirelessly receiving power from the Tx device 302, an Rx IC 327, a charging circuit 321d (e.g., a PMIC, switched capacitor, or voltage divider), and a battery 321e. The Rx IC 327 includes a matching circuit 321a connected to the receiving coil 321L, a rectifier circuit 321b for rectifying the received AC power into DC power, and an adjustment circuit 321c (e.g., an LDO) for adjusting the charging voltage.

[0088] The processor 322 can perform overall control of the Rx device 301, generate various messages required for wireless power reception, and transmit wireless power to the communication circuit 323.

[0089] The communication circuit 323 includes a first communication circuit 323a and a second communication circuit 323b. The first communication circuit 323a can communicate with the Tx device 302 through the receiving coil 321L.

[0090] The first communication circuit 323a can communicate with the first communication circuit 313a via the receiving coil 321L. Data (or communication signals) generated by the first communication circuit 323a can be transmitted via the receiving coil 321L. The first communication circuit 323a can transmit data to the Tx device 302 via an amplitude shift keying (ASK) modulation scheme.

[0091] The second communication circuit 323b can communicate with the Tx device 302 via one of various short-range communication schemes such as Bluetooth, BLE, Wi-Fi and NFC.

[0092] Packets, information, or data transmitted and received by Tx device 302 and Rx device 301 may use at least one of the first communication circuit 323a or the second communication circuit 323b.

[0093] At least one sensor 324 may include a current / voltage sensor, a temperature sensor, an illuminance sensor, and / or an acceleration sensor.

[0094] The display 325 can display various information for wireless power transmission and reception.

[0095] The sensing circuit 326 can detect the Tx device 302 by detecting a search signal or power received from the Tx device 302. The sensing circuit 326 can detect changes in the signal at the input / output terminals of the coil 321L, the matching circuit 321a, or the rectifier circuit 321b by detecting a signal generated by the coil 321L from the signal output from the Tx device 302. Alternatively, the sensing circuit 326 may be included in the receiving circuit 321.

[0096] According to an embodiment, the electronic device may include a battery, a coil, a wireless charging receiver circuit electrically connected to the coil, a power management module configured to control the charging state of the battery using a voltage supplied from the wireless charging receiver circuit, and a processor operatively connected to the wireless charging receiver circuit and the power management module, wherein the processor may be configured to receive power from a wireless charging transmitter via the coil, determine whether predetermined conditions are met when using the received power to charge the battery, and transmit a foreign object detection request packet to the wireless charging transmitter when the predetermined conditions are met.

[0097] The processor can adjust the power supply load from the wireless charging circuit to the power management module before transmitting a foreign object detection (FOD) request packet. The processor can reduce the power supply current from the wireless charging circuit to the power management module before transmitting the FOD request packet. Even if the wireless charging transmitter stops transmitting power in response to the FOD request packet, the processor can maintain the battery's state of charge. The processor can transmit FOD request packets at predetermined intervals. When the temperature of at least one component of the electronic device 301 rises, the processor can shorten the predetermined interval. When the temperature of at least one component of the electronic device rises above a threshold, the processor can transmit a FOD request packet. The processor can transmit a FOD request packet in response to a request from the wireless charging transmitter.

[0098] According to an embodiment, the wireless charging transmitter may include a transmitting coil, a wireless charging transmitting circuit electrically connected to the transmitting coil, and a controller operatively connected to the wireless charging transmitting circuit. The controller may be configured to, upon detecting a wireless charging receiver, set up charging by exchanging at least one predetermined packet with the wireless charging receiver; transmit power to the wireless charging receiver based on the set charging; temporarily stop transmitting power when receiving a foreign object detection request packet from the wireless charging receiver while transmitting power; detect the presence of a foreign object based on the resonant characteristics of the transmitting coil while power transmission is stopped; stop transmitting power if a foreign object is present; and restart power transmission if no foreign object is present.

[0099] The controller can measure a first Q value, which is the electrical characteristic of the transmitting coil, by generating a first Q ping before detecting a wireless charging receiver, measure a second Q value, which is the electrical characteristic of the transmitting coil, by generating a second Q ping before transmitting power, measure a third Q value, which is the electrical characteristic of the transmitting coil, when power transmission stops, and determine the presence of a foreign object when the third Q value meets a predetermined condition.

[0100] The controller can determine the presence of a foreign object when the third Q value is below a threshold, when the third Q value is less than or equal to a predetermined ratio of the second Q value, or when the third Q value is less than or equal to a predetermined ratio of the first Q value.

[0101] The controller may stop transmitting power after a predetermined delay period following the receipt of a foreign object detection request packet. The controller may also receive a control error packet (CEP) from the wireless charging receiver after receiving the foreign object detection request packet, and stop transmitting power after a predetermined delay period following the receipt of the CEP.

[0102] According to an embodiment, a method for performing wireless charging by an electronic device may include: receiving power from a wireless charging transmitter via a coil and a wireless charging receiving circuit, determining whether predetermined conditions are met when using the received power to charge a battery, and when the predetermined conditions are met, transmitting a foreign object detection request packet to the wireless charging transmitter.

[0103] The method may further include: adjusting the power supply load from the wireless charging receiver circuit to the power management module before transmitting a foreign object detection request packet. The method may further include: maintaining the battery's charging state even if the wireless charging transmitter stops transmitting power in response to the foreign object detection request packet. The method may further include: transmitting foreign object detection request packets at predetermined intervals. The method may further include: transmitting a foreign object detection request packet when the temperature of at least one component of the electronic device rises above a threshold.

[0104] Figure 5A The operation of a wireless charging system according to an embodiment is shown, and Figure 5B The operation of a wireless charging system according to an embodiment is illustrated. For example, Figure 5A This demonstrates the operation when no foreign object is detected during wireless charging, while Figure 5B This illustrates the action taken when a foreign object is detected during wireless charging.

[0105] refer to Figure 5A and Figure 5B The Tx device generates a simulated ping (A-ping) (e.g., the first ping) at time t1 and detects whether a specific object (e.g., the Rx device or metallic material) is located on the interface surface (e.g., the active area). The Tx device can generate the simulated ping at a predetermined period, such as 400ms.

[0106] When the simulated ping detects a specific object on the interface surface at time t2, the Tx device generates a digital ping (D-ping) (e.g., a second ping). A digital ping lasting tens of microseconds can be generated. The digital ping activates the wireless charging circuitry of the Rx device. Upon receiving a Signal Strength Packet (SSP) from the Rx device, the Tx device can determine that the specific object detected on the interface surface is the Rx device. Figure 5A and Figure 5B In the above, the specific object detected at time t2 is not an Rx device.

[0107] At time t3, the Tx device generates a Q ping (e.g., the third ping). The Q ping can be used to measure the Q value of the transmitting coil via the Tx device. The Q value can be data based on the current (or voltage) measured in the transmitting coil or the change in current (or voltage) after the Q ping is generated. The Q value measured by the Tx device before the Rx device is detected (e.g., during standby mode) can be defined as Q0. 待机 .exist Figure 5A and Figure 5B In this context, the Rx device is placed on the Tx device 302 at time t4.

[0108] At time t5, the Rx device transmits an SSP511 in response to a digital ping generated by the Tx device. The Tx device determines, based on the received SSP511, that a specific object detected on the interface surface is the Rx device.

[0109] When an Rx device is detected, the Tx device can stop generating additional simulated pings.

[0110] At time t6, the Tx device generates Qping and measures the Q value of the transmitting coil. The Q value measured by the Tx device before transmitting power to the Rx device can be defined as Q. bpt .

[0111] Wireless charging can be configured when the Tx device transmits and receives predetermined packets from the Rx device at time points t7 to t10. For example, the predetermined packets include SSP 512, identification packet 513, configuration packet 514, and FOD status packet 516.

[0112] Once wireless charging is configured, the Tx device can transmit power to the transmitting coil. The Rx device can then use the received power to charge the battery.

[0113] The Rx device determines that a foreign object (FOD) has been detected when it wirelessly receives power at time t11. For example, as indicated by reference numeral 517, the Rx device determines that it is transmitting a FOD request packet 518 while charging a battery using the received power. The FOD request packet 518 may be referred to as a request Q-measurement packet (RQP) 518. For the RQP 518, proprietary packets or auxiliary data control packets that may be used according to the Wireless Power Union (WPC) standard may be defined and used for the purposes of the corresponding function.

[0114] The Rx device may determine to transmit RQP 518 based on predetermined conditions (or predetermined events), as indicated by reference numeral 517 in the accompanying drawings. For example, the Rx device may transmit RQP 518 in the following circumstances: 1) at a predetermined period, 2) when an abnormal state is detected, 3) in response to a request received from the Tx device, or 4) in response to a combination of at least two of conditions 1-3.

[0115] The Rx device can launch RQP 518 at predetermined intervals.

[0116] The Rx device can transmit RQP 518 at a faster cycle during fast wireless charging. For example, the Rx device can transmit RQP 518 in a first cycle when charging the battery by receiving a first power from the Tx device 302, and can transmit RQP 518 in a second cycle with a shorter timeframe when charging the battery by receiving a second power from the Tx device that is higher than the first power.

[0117] The Rx device can be configured to have a shorter firing cycle for the RQP 518 as the temperature of at least one component of the Rx device increases.

[0118] When there is no problem completely stopping the power transmission from the Tx device, the Rx device can configure the transmission period of the RQP 518 to gradually increase, even if the RQP 518 is transmitted a certain number of times (e.g., a predetermined number of times).

[0119] The Rx device can charge the battery in a constant current-constant voltage (CC-CV) manner and configure the emission period of the RQP 518 to be shorter in the CC interval. For example, the Rx device can emit the RQP 518 in the CC interval in the third cycle and emit the RQP 518 in the CV interval in a fourth cycle that is longer than the third cycle.

[0120] When an abnormal state is detected, such as when the temperature in at least one component of the Rx device rises above a threshold, the Rx device may emit an RQP 518.

[0121] The Rx device can transmit an RQP 518 in response to a request received from the Tx device.

[0122] At time point t12 before transmitting RQP 518, the Rx device can adjust the load of the supply power (or output power) from the Rx IC to the PMI C. For example, the AP of the Rx device can reduce the supply power current to the PMI C before transmitting RQP 518. Even if the Tx device that receives RQP 518 stops transmitting power, the Rx device can prevent charging from stopping by adjusting the load of the supply power to the PMI C before transmitting RQP 518. The following will refer to... Figure 8 Detailed description of how adjustments to the power supply load prevent the Rx device from stopping battery charging.

[0123] The Rx device transmits RQP 518 to the Tx device at time t13, and the Tx device may temporarily stop power transmission in response to RQP 518 (e.g., for less than about 200 μs).

[0124] The Tx device can detect foreign objects at time t14 when power transmission stops. The Tx device can measure the Q value of the transmitting coil based on the freewheeling characteristics of the voltage and current in the transmitting coil when power transmission stops. At this time, the measured Q value can be defined as Q0. dpt .

[0125] The Tx device can be based on the measured Q. dpt Determine if a foreign object is present.

[0126] The Tx device can restart or stop power transmission based on the results of the foreign object detection operation.

[0127] The Tx device can restart power transmission when it is determined that a foreign object is present, and can maintain or stop power transmission based on the determination of the presence of a foreign object.

[0128] like Figure 5A As shown, when no foreign object is detected, the Tx device restarts power transmission, and the Rx device can continue to charge the battery by restarting power transmission from the Tx device.

[0129] However, reference Figure 5B Reference numeral 519 indicates that the Tx device stops power transmission when a foreign object is detected. Furthermore, as... Figure 5B As shown by reference numeral 520 in the attached figure, by stopping the power transmission from the Tx device 519, the low power (Rx load power) supplied from the Rx device to the PMI C is reduced to below a threshold (Vth), and the Rx device can stop battery charging.

[0130] Figure 6 This is a flowchart illustrating the operation of the Tx device according to an embodiment.

[0131] refer to Figure 6In step 610, the Tx device is in a standby state, where the Rx device is not placed on the Tx device. The Tx device can periodically generate analog pings in the standby state. When a specific object (such as the Rx device or metallic material) is detected on the interface surface via the analog ping, the Tx device can generate digital pings and Q-pings. The Tx device can measure the Q value of the transmitting coil via the Q-ping. 待机 Alternatively, the Tx device can omit the generation of Q ping and measure Q via digital ping. 待机 .

[0132] In step 620, the Tx device detects the Rx device based on the SSP received from the Rx device. The Tx device can determine, based on the received SSP, that a specific object detected on the interface surface is an Rx device.

[0133] The Tx device can generate Q ping before sending power to the Rx device, and can measure Q as the Q value of the transmitting coil. bpt .

[0134] In step 630, the Tx device configures wireless charging when transmitting a predetermined packet to and receiving a predetermined packet from the Rx device. For example, the predetermined packet may include an SSP, an identification packet, a configuration packet, and / or a FOD status packet. The FOD status packet may include Q, which is the Q value of the receiving coil. 报告 Therefore, the Tx device can obtain the Q value of the receiving coil based on the SSP. 报告 Tx devices can be based on Q bpt (Q value of the transmitting coil) and Q 报告 The Q value of the receiving coil determines whether a metallic foreign object is present.

[0135] In step 640, when the wireless charging configuration is complete, the Tx device transmits power through the transmitting coil.

[0136] In step 650, the Tx device receives an RQP from the Rx device when transmitting power through the transmitting coil. The RQP can be a packet transmitted by the Rx device based on predetermined conditions, for example, as referenced above. Figure 5A and Figure 5B As described.

[0137] In step 660, the Tx device stops power transmission and acquires the Q factor in response to the receipt of RQP. The Tx device may temporarily stop power transmission in response to RQP.

[0138] For example, to synchronize the charging stop operation between the Rx device and the Tx device, the Tx device may receive an RQP and stop power transmission after a predetermined delay (e.g., 3ms) after receiving the RQP, or the Tx device may receive a CEP from the Rx device after receiving the RQP and stop power transmission after a predetermined delay (e.g., 3ms) after receiving the CEP.

[0139] The Tx device can obtain the Q value of the transmitting coil based on the freewheeling characteristics of the voltage and current of the transmitting coil when power transmission is stopped. dpt .

[0140] In step 670, the Tx device is based on Q dpt Determine if a foreign object has been detected.

[0141] For example, when the measured Q dpt The value is less than or equal to the threshold (e.g., Q). dpt When <15), the measured Q dpt The value is less than or equal to Q bpt The predetermined ratio of the value (e.g., Q) dpt bpt *30%) and / or when the measured Q dpt The value is less than or equal to Q obtained in standby mode. 待机 The predetermined ratio (e.g., Q) dpt 待机 When the concentration of metal foreign matter is 10%, the Tx device 302 determines that a metallic foreign matter is present.

[0142] The Tx device can also determine the presence of foreign objects using other methods and the examples described above. For instance, the Tx device can measure the Q... dpt The value and Q, which is the Q value of the receiving coil 报告 The comparison is performed, and the presence of foreign objects is determined based on the comparison results.

[0143] The Tx device can restart power transmission when performing foreign object detection, and can maintain or stop restarting power transmission based on the determination of the presence of foreign object.

[0144] In step 680, when a foreign object is detected in step 670, the Tx device stops transmitting power.

[0145] However, if no foreign object is detected in step 670, the Tx device restarts power transmission in step 640.

[0146] Figure 7 This is a flowchart illustrating the operation of Rx according to an embodiment.

[0147] refer to Figure 7 ​​In step 710, after placing the Rx device on the Tx device, the Rx device is configured for wireless charging. Wireless charging can be configured when the Rx device transmits predetermined packets to and receives predetermined packets from the Tx device. For example, the predetermined packets may include SSP, identification packets, configuration packets, and / or FOD status packets.

[0148] In step 720, the Rx device receives power from the Tx device and charges the battery based on the received power.

[0149] In step 730, the Rx device determines whether a predetermined condition (or predetermined event) is met when charging the battery based on the received power. The predetermined condition may be a trigger condition for transmitting the RQP to the Tx device, for example, as referenced above. Figure 5A and Figure 5B As described.

[0150] When a predetermined condition is met in step 730, the Rx device adjusts the load of the input power (or supply power) supplied to the charging circuit in step 740. For example, the AP of the Rx device can reduce the current of the supply power supplied to the PMI C before transmitting the RQP. Even if the Tx device that receives the RQP stops transmitting power, the Rx device can prevent battery charging from stopping by adjusting the load of the supply power supplied to the PMI C before transmitting the RQP.

[0151] If the predetermined conditions are not met in step 730, the Rx device charges the battery in step 720.

[0152] In step 750, the Rx device transmits the RQP to the Tx device.

[0153] In step 760, the Tx device re-transmits or stops power transmission based on whether a foreign object is detected, and therefore, the Rx device can restart or stop power reception.

[0154] Figure 8 This is a graph showing the voltage supplied to the PMI C of the Rx device during wireless charging according to an embodiment.

[0155] refer to Figure 8 Time period 801 corresponds to Figure 5A and Figure 5B The time interval from t10 to t13, time period 802 corresponds to Figure 5A and Figure 5B The time interval from t13 to t14, and time interval 803 corresponds to Figure 5A and Figure 5B The interval after time t14.

[0156] Figure 810 shows the supply voltage (e.g., the voltage supplied to PMI C), where the power supply to PMI C is regulated to 500mA by the Rx device based on the fulfillment of predetermined conditions.

[0157] Figure 820 shows the supply voltage according to the comparative example, where the supply power load is kept at 1A without any adjustment.

[0158] Referring to time period 802 in Figure 810, the voltage supplied from the Rx device to the PMI C experiences a voltage drop due to the Tx device temporarily ceasing to transmit power signals. However, the voltage supplied to the PMI C does not fall below the threshold Vth because the power load supplied to the PMI C has decreased before the Rx device transmits the RQP. By preventing the voltage supplied to the PMI C from dropping below the threshold Vth, the Rx device can maintain the battery's state of charge when the Tx device determines the presence of a foreign object. The threshold Vth (e.g., undervoltage lockout (UVLO) of the PMI C) is a reference value for the Rx device to determine whether to stop charging the battery. If the voltage supplied to the PMI C drops below the threshold Vth, the Rx device can stop charging the battery.

[0159] Referring to time period 802 of Figure 820, the voltage supplied from the Rx device according to the comparative example to PMI C may decrease due to the temporary cessation of power signal transmission from the Tx device. However, the voltage supplied to PMI C according to the comparative example decreases rapidly and therefore may not fall below the threshold Vth because the power supply load to PMI C is not reduced before the Rx device transmits RQP.

[0160] When the voltage supplied to PMI C drops below the threshold Vth, the Rx device according to the comparative example can stop charging the battery.

[0161] Referring to reference numeral 821 in Figure 820, even if the Tx device 302 determines that no foreign object is present and restarts power transmission, the Rx device may not immediately begin charging the battery. For example, the Rx device may restart charging the battery after performing the configuration wireless charging process according to the simulated ping steps. Therefore, while the comparative example according to Figure 820 has the problem of stopping charging the battery in the Rx device when a foreign object is detected, the embodiment according to Figure 810 may not stop charging the battery in the Rx device.

[0162] Therefore, by pre-adjusting the power supply load to PMI C before the Rx device emits RQP, battery charging interruption can be prevented, as shown by reference numeral 821 in Figure 820.

[0163] Figure 9This is a graph showing the Q value of the transmitting coil obtained before the Tx device transmits power according to an embodiment. Figure 10 This is a graph showing the Q value of the transmitting coil obtained when the Tx device is transmitting power in the absence of foreign objects, according to an embodiment. Figure 11 This is a graph showing the Q value of the transmitting coil obtained when the Tx device transmits power in the presence of a foreign object, according to an embodiment.

[0164] exist Figures 10 to 11 In the middle, time period 801 corresponds to Figure 5A and Figure 5B The time interval 802 corresponds to the period from t10 to t13. Figure 5A and Figure 5B The time interval is from t13 to t14, and time interval 803 occurs during this period. Figure 5A and Figure 5B After time t14.

[0165] refer to Figure 9 The Tx device can generate Qping before power transmission and measure Q corresponding to changes in voltage or current of the transmitting coil. bpt Q bpt The peak value of the load waveform that can be defined to freewheel in the transmitting coil has a first slope of 902.

[0166] refer to Figure 10 The Tx device can temporarily stop transmitting power after receiving RQP from the Rx device, and Q, which is the Q value of the transmitting coil, can be measured by resonance based on the freewheeling characteristics of the voltage and current of the transmitting coil. dpt For example, Q dpt It can be defined as a change with a second slope of 1002.

[0167] When there is no foreign object between the Tx device and the Rx device, the change of the second slope 1002 can be similar to that of Q. bpt of Figure 9 The change in the first slope 902 may be within a predetermined error range. When the change in the second slope 1002 is similar to Q... bpt When the first slope 902 changes or is within the predetermined error range, the Tx device can determine that there is no foreign object between the Tx device and the Rx device.

[0168] refer to Figure 11 When there is a foreign object between the Tx device and the Rx device, Q dpt It has a change with a third slope of 1102, and the change with Q... bpt of Figure 9 The change in the first slope 902 can vary by a different amount and exceed the error range. Q dptIt can have a change in the third slope 1102, and when the change in the third slope 1102 is related to Q bpt of Figure 9 When the difference between the changes in the first slope 902 is greater than the error range, the Tx device can determine that there is a foreign object between the Tx device and the Rx device.

[0169] While this disclosure has been shown and described with reference to certain embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made in this disclosure without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. An electronic device comprising: Battery; coil; Wireless charging receiver circuit; A power management module is configured to control the charging state of the battery using the voltage supplied from the wireless charging receiver circuit. as well as Processor, the processor being configured to: Power is received from the wireless charging transmitter via the coil. Determine whether predetermined conditions are met when using the received power to charge the battery, and In response to determining that the predetermined conditions are met, the power supply load from the wireless charging receiver circuit to the power management module is adjusted by reducing the current supplied from the wireless charging receiver circuit to the power management module, and a foreign object detection request packet is sent to the wireless charging transmitter.

2. The electronic device according to claim 1, wherein, The processor is further configured to maintain the battery's charging state even if the wireless charging transmitter stops transmitting power in response to the foreign object detection request packet.

3. The electronic device according to claim 1, wherein, The processor is further configured to send the foreign object detection request packets at predetermined intervals.

4. The electronic device according to claim 3, wherein, The processor is further configured to reduce the predetermined cycle when the temperature of at least one component of the electronic device rises.

5. The electronic device according to claim 1, wherein, The processor is further configured to send the foreign object detection request packet when the temperature of at least one component of the electronic device rises above a threshold.

6. The electronic device according to claim 1, wherein, The processor is further configured to transmit the foreign object detection request packet in response to a request from the wireless charging transmitter.

7. A device for performing wireless charging transmission, the device comprising: Transmitting coil; Wireless charging transmitter circuit; as well as The controller is configured to: Charging is configured based on exchanging at least one predetermined packet with the detected wireless charging receiver. Based on the configured charging, power is transmitted to the detected wireless charging receiver. The power transmission is temporarily stopped in response to receiving a foreign object detection request packet from the wireless charging receiver, wherein the wireless charging receiver includes a wireless charging receiving circuit and a power management module, and is configured to: adjust the power load supplied from the wireless charging receiving circuit to the power management module by reducing the current supplied from the wireless charging receiving circuit to the power management module before transmitting the foreign object detection request packet to the device. When the power transmission is temporarily stopped, the presence of foreign objects is detected based on the resonant characteristics of the transmitting coil. In response to the detection of a foreign object, the transmission of power is completely stopped, and The power transmission is restarted in response to the detection of the absence of foreign objects.

8. The device according to claim 7, wherein, The controller is further configured to: The first Q value of the transmitting coil is measured by generating a first Q ping before the wireless charging receiver is detected. The second Q value of the transmitting coil is measured by generating a second Q ping before transmitting the power. The third Q value of the transmitting coil was measured while the power transmission was temporarily stopped, and When the third Q value meets the predetermined conditions, it is determined that a foreign object exists.

9. The device according to claim 8, wherein, The controller is further configured to determine the presence of the foreign object when the third Q value is less than a threshold.

10. The device according to claim 8, wherein, The controller is further configured to determine the presence of the foreign object when the third Q value is less than or equal to a predetermined ratio of the second Q value.

11. The device according to claim 8, wherein, The controller is further configured to determine the presence of the foreign object when the third Q value is less than or equal to a predetermined ratio of the first Q value.

12. The device according to claim 7, wherein, The controller is further configured to stop transmitting power when a predetermined delay period has elapsed after receiving a foreign object detection request packet.

13. The device according to claim 7, wherein, The controller is further configured to: After receiving the foreign object detection request packet, a control error packet (CEP) is received from the wireless charging receiver, and Power transmission will cease after a predetermined delay period following receipt of the CEP.

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