Wireless power transmitting apparatus, method for operating wireless power transmitting apparatus, and non-transitory storage medium

Abstract

The invention relates to a wireless power transmitting apparatus, a method for operating the wireless power transmitting apparatus, and a non-transitory storage medium. According to an embodiment, a controller of a wireless power transmission apparatus may be configured to: control a power supply circuit to apply a first power to a transmission coil in a first ping operation; detecting first information related to the first ping operation when the first ping operation is executed, and storing the first information in the memory; identifying an external object placed in a charging area of a housing of the wireless power transmitting apparatus based on the first information and the reference information; detecting second information related to the first ping operation by re-performing the first ping operation, and identifying a movement of the external object based on a difference between the first information and the second information; in a second ping operation, controlling the power supply circuit to apply a second power for communicating with the object to the transmission coil; and performing an operation for foreign object detection (FOD) and an operation for transmitting power for wireless charging to an external object based on recognizing that a response is received from the object while the second ping operation is performed. Other embodiments are also possible.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a wireless power transmitting device for detecting foreign objects, a method for operating the wireless power transmitting device, and a non-transitory storage medium. Background Technology

[0002] Wireless power transmission technology using magnetic induction is a method of transmitting electricity by using an electromagnetic field induced in a coil. The wireless power transmitting device applies current to the transmission coil to generate an electromagnetic field, and the induced electromotive force is formed in the receiving coil of the wireless power receiving device through the generated electromagnetic field, so that electricity can be transmitted wirelessly.

[0003] A wireless power receiver can wirelessly receive power from a wireless power transmitter and can perform in-band communication. The wireless power receiver can provide information to the wireless power transmitter by performing in-band communication. For example, the wireless power receiver can perform in-band communication based on an amplitude shift keying (ASK) modulation method. At least one additional element can be selectively connected to the resonant circuit of the wireless power receiver via a switch, and the wireless power receiver can perform modulation by controlling the on / off state of the switch. Depending on the modulation in the wireless power receiver, the amplitude of the current and / or voltage applied to the transmitting coil of the wireless power transmitter can be changed. The wireless transmitter and receiver can demodulate and / or decode information about the amplitude of the current and / or voltage applied to the transmitting coil, thereby identifying the information provided by the wireless power receiver. Summary of the Invention

[0004] Technical solution

[0005] If a foreign object is present in a wireless power transmitter, the transmitter's efficiency may be reduced or the transmitter may be damaged. Therefore, foreign objects can be detected using a foreign object detection (FOD) method. This detection method can be based on whether electrical signals (e.g., ping signals) are transmitted to identify the presence of an external object and whether a response is received from the external object.

[0006] However, when a foldable electronic device, including a hinge structure made of metal, is identified as an external object, if the electronic device with the hinge structure is placed on a wireless power transmitter for wireless charging of the electronic device, the metal of the hinge structure may cause false detection of the foreign object, and thus may perform erroneous foreign object detection (FOD).

[0007] The technical objectives to be achieved in this disclosure are not limited to those described above, and other technical objectives not mentioned will be clearly understood by those skilled in the art from the following description.

[0008] According to embodiments of this disclosure, a wireless power transmission device may include a transmitting coil, a power supply circuit, a memory, and a controller electrically connected to the transmitting coil, the power supply circuit, and the memory.

[0009] According to an embodiment, the controller can be configured to control the power supply circuit to apply a first power to the transmitting coil during the first ping operation.

[0010] According to an embodiment, the controller can be configured to detect first information related to the first ping operation when performing the first ping operation, and store the first information in a memory.

[0011] According to an embodiment, the controller can be configured to identify an external object placed on the charging area of ​​the housing of the wireless power transmitter based on first information and reference information.

[0012] According to an embodiment, the controller can be configured to detect second information related to the first ping operation by re-executing the first ping operation, and to identify the movement of an external object based on the difference between the first information and the second information.

[0013] According to an embodiment, the controller can be configured to control the power supply circuit to apply a second power to the transmitting coil for communicating with an external object during a second ping operation.

[0014] According to an embodiment, the controller can be configured to perform foreign object detection (FOD) operations and / or send power to an external object for wireless charging based on the recognition that a response from an object is received during the execution of a second ping operation.

[0015] According to an embodiment, a method of operating a wireless power transmitter may include applying a first power to the transmitting coil of the wireless power transmitter via a power supply circuit of the wireless power transmitter during a first ping operation.

[0016] According to an embodiment, the method may include detecting first information when performing a first ping operation and storing the first information in a memory.

[0017] According to an embodiment, the method may include identifying an external object placed on the charging area of ​​the housing of the wireless power transmitter based on first information and reference information.

[0018] According to an embodiment, the method may include detecting second information related to the first ping operation by re-performing the first ping operation, and identifying the movement of an external object based on the difference between the first information and the second information.

[0019] According to an embodiment, the method may include: in a second ping operation, applying a second power for communicating with an object to a transmitting coil via a power supply circuit.

[0020] According to an embodiment, the method may include: performing foreign object detection (FOD) based on the recognition that a response from an object is received during the execution of a second ping operation, and sending power to the external object for wireless charging.

[0021] According to an embodiment, in a non-transitory storage medium storing a program, the program, when executed by a processor of the wireless power transmitter, may include instructions that cause the wireless power transmitter to perform: in a first ping operation, applying a first power to the transmitting coil of the wireless power transmitter via a power supply circuit of the wireless power transmitter; during the execution of the first ping operation, detecting first information related to the first ping operation and storing the first information in a memory; identifying an external object placed on a charging area of ​​the housing of the wireless power transmitter based on the first information and reference information; detecting second information related to the first ping operation by re-executing the first ping operation, and identifying the movement of the external object based on the difference between the first information and the second information; in a second ping operation, applying a second power for communicating with the object to the transmitting coil via a power supply circuit, and performing foreign object detection (FOD) and sending power for wireless charging to the external object based on the identification that a response from the object was received during the execution of the second ping operation. Attached Figure Description

[0022] Figure 1 This is a block diagram illustrating an electronic device in a network environment according to various embodiments.

[0023] Figure 2 This is a diagram illustrating a wireless power transmitting device and a wireless power receiving device according to an embodiment.

[0024] Figure 3 This is a diagram illustrating a wireless power transmitting device and a wireless power receiving device according to an embodiment.

[0025] Figure 4 This is a diagram illustrating an example of an operation method of a wireless power transmission device according to an embodiment.

[0026] Figure 5 This is a diagram illustrating an example of an operation method of a wireless power transmission device according to an embodiment.

[0027] Figure 6a and Figure 6b This is a diagram illustrating an example of an operation method of a wireless power transmission device according to an embodiment.

[0028] Regarding the description of the accompanying drawings, the same or similar reference numerals may be used to refer to the same or similar elements. Detailed Implementation

[0029] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement the embodiments. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Regarding the description of the drawings, the same or similar reference numerals may be used to refer to the same or similar elements. Additionally, descriptions of well-known functions and configurations may be omitted in the drawings and related descriptions for clarity and brevity. As used in this disclosure, the term "user" may refer to a person using an electronic device or a device using an electronic device (e.g., an artificial intelligence electronic device).

[0030] Figure 1 This is a block diagram illustrating an electronic device 101 in a network environment 100 according to various embodiments. (Refer to...) 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 at least one of 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 the above 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 of the components described above (e.g., sensor module 176, camera module 180, or antenna module 197) may be implemented as a single integrated component (e.g., display module 160).

[0031] 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 an 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)) or an auxiliary processor 123 (e.g., graphics processing unit (GPU), neural processing unit (NPU), image signal processor (ISP), sensor central processor, or communication processor (CP)) that is 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 dedicated to a specific 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.

[0032] When the main processor 121 is inactive (e.g., in sleep) state, 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) may be implemented as part of another component (e.g., camera module 180 or communication module 190) functionally associated with the auxiliary processor 123. According to embodiments, the auxiliary processor 123 (e.g., a neural processing unit) may include hardware architecture dedicated to artificial intelligence model processing. Artificial intelligence models can be generated through machine learning. For example, such learning can be performed via electronic device 101 where artificial intelligence is performed 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 network may be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), or a deep Q-network, or a combination of two or more thereof, but is not limited thereto. Additionally or optionally, the artificial intelligence model may include software structures in addition to hardware structures.

[0033] 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.

[0034] 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.

[0035] The input module 150 can receive commands or data from outside the electronic device 101 (e.g., a user) that will be used by other components of the electronic device 101 (e.g., processor 120). The input module 150 may include, for example, a microphone, mouse, keyboard, keys (e.g., buttons), or digital pen (e.g., stylus).

[0036] 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. The receiver can be used to receive incoming calls. According to an embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0037] 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 a touch sensor adapted to detect touch or a pressure sensor adapted to measure the intensity of the force caused by touch.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Connection 178 may include a connector, through which electronic device 101 may be physically connected to an external electronic device (e.g., electronic device 102). According to embodiments, connection 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

[0042] The haptic 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 an embodiment, the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulator.

[0043] 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.

[0044] 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).

[0045] 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.

[0046] 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 separate from each other (e.g., multiple chips). 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.

[0047] Wireless communication module 192 can support 5G networks following 4G networks and next-generation communication technologies (such as new radio (NR) access technologies). NR access technologies can support enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), or ultra-reliable low-latency communication (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 MIMO (FD-MIMO), array antennas, analog beamforming, or massive antennas. 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 greater) 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 round trip) for implementing URLLC.

[0048] 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 printed circuit board (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.

[0049] 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, a radio frequency integrated circuit (RFIC), and multiple antennas (e.g., an array antenna), wherein the RFIC is disposed on or adjacent to a first surface (e.g., a bottom surface) of the printed circuit board and is capable of supporting a specified high-frequency band (e.g., a millimeter-wave band), and the multiple antennas are disposed on or adjacent to a second surface (e.g., a top surface or a side surface) of the printed circuit board and are capable of transmitting or receiving signals in the specified high-frequency band.

[0050] 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)).

[0051] 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 or 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, 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 of the result. 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 embodiments, 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).

[0052] Figure 2 This is a diagram illustrating a wireless power transmitting device and a wireless power receiving device according to an embodiment.

[0053] Reference Figure 2 The wireless power transmission device 201 according to the embodiment (e.g., Figure 1 The electronic device 102 can wirelessly transmit data to the wireless power receiving device 101 (e.g., Figure 1The electronic device 101 transmits power. The wireless power transmitting device 201 can receive information from the wireless power receiving device 101. In the example, the wireless power transmitting device 201 can transmit power according to an inductive method. When the wireless power transmitting device 201 is configured to operate in an inductive method, the wireless power transmitting device 201 may include at least one of, for example, a power source, a DC-DC conversion circuit (e.g., a DC / DC converter), a DC-AC conversion circuit (e.g., an inverter), an amplifier circuit, an impedance matching circuit, at least one capacitor, at least one coil, or a communication modulation circuit. The at least one capacitor may also form a resonant circuit together with at least one coil. The wireless power transmitting device 201 may implement at least a portion of the method defined in the Wireless Power Consortium (WPC) Qi standard. The wireless power transmitting device 201 may include a coil capable of generating an induced magnetic field when current flows, according to the inductive method. The process by which the wireless power transmitting device 201 generates an induced magnetic field can be represented as the wireless power transmitting device 201 wirelessly transmitting power. Additionally, according to the resonance method or the induction method, an induced electromotive force (or current, voltage, and / or power) can be generated in the coil of the wireless power receiving device 101 through the magnetic field generated in the surrounding area. The process of generating an induced electromotive force through the coil can be represented as the wireless power receiving device 101 wirelessly receiving power.

[0054] The wireless power transmitting device 201 according to the embodiment can communicate with the wireless power receiving device 101. For example, the wireless power transmitting device 201 can communicate with the wireless power receiving device 101 according to an in-band method. The wireless power transmitting device 201 can modulate the data to be transmitted, for example, according to a frequency shift keying (FSK) modulation method, and the wireless power receiving device 101 can modulate the data according to an amplitude shift keying (ASK) modulation method, thereby providing information. The wireless power transmitting device 201 can identify the information provided by the wireless power receiving device 101 based on the amplitude of the current and / or voltage applied to the transmitting coil. Although Figure 2 The description shows the wireless power receiving device 101 as directly transmitting information to the wireless power transmitting device 201, but this is only for ease of understanding, and those skilled in the art will understand that the wireless power receiving device 101 only controls the on / off state of at least one internal switch. The operation of modulation based on ASK modulation methods and / or FSK modulation methods can be understood as the operation of transmitting data (or packets) according to in-band communication methods, and the operation of demodulation based on ASK demodulation methods and / or FSK demodulation methods can be understood as the operation of receiving data (or packets) according to in-band communication methods.

[0055] In this disclosure, the fact that the wireless power transmitting device 201 or the wireless power receiving device 101 performs a specific operation may mean that various hardware components included in the wireless power transmitting device 201 or the wireless power receiving device 101, such as controllers (e.g., microcontroller units (MCUs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), microprocessors, or application processors (APs)), perform the specific operation. Optionally, the fact that the wireless power transmitting device 201 or the wireless power receiving device 101 performs a specific operation may mean that the controller controls other hardware to perform the specific operation. Optionally, the fact that the wireless power transmitting device 201 or the wireless power receiving device 101 performs a specific operation may mean that at least one instruction for performing the specific operation stored in the storage circuitry (e.g., memory) of the wireless power transmitting device 201 or the wireless power receiving device 101 is executed, thereby causing the controller or other hardware to perform the specific operation.

[0056] In this disclosure, the wireless power receiving device 101 may be a foldable or flip-type electronic device in which a portion of the housing is folded, and may include a hinge structure made of metal placed on the portion in which the housing is folded. In embodiments of this disclosure, when the wireless power receiving device 101 is placed on the charging area 203, the wireless power transmitting device 201 may prevent erroneous foreign object detection (FOD) due to the metal of the hinge structure being mistakenly identified as a foreign object (FO) before a response (e.g., a signal strength packet (SSP)) is received from the wireless power receiving device 101.

[0057] In this disclosure, the wireless power transmitting device 201 can perform ping, identification and configuration, FOD determination negotiation, and power transmission steps to transmit power to the wireless power receiving device 101 in accordance with the methods defined in the Qi standard of the Wireless Power Union (WPC).

[0058] Figure 3This diagram illustrates a wireless power transmitting device and a wireless power receiving device according to an embodiment. The wireless power transmitting device 201 according to an embodiment may include at least one of a power supply 211, an inverter 218 including a plurality of switches (Q1, Q2, Q3, and Q4), a capacitor 212, a transmitting coil 213, a demodulation circuit 214, a controller 215, or a DC / DC converter 217. According to an embodiment, the power supplied by the power supply 211 may be provided to the DC / DC converter 217. The power supply 211 may include at least one of an interface to be connected to an external travel adapter (TA), a battery (not shown) of the wireless power transmitting device 201, a charger (not shown), or a power management integrated circuit (PMIC) (not shown). The power supply 211 may, for example, provide DC power to the DC / DC converter 217, but the form of the power to be provided is not limited. The DC / DC converter 217 may convert the voltage of the received power and apply the converted voltage to the inverter 218. DC / DC converter 217 can change the voltage of the applied DC power and supply DC power with the changed voltage (or drive voltage VDD) to inverter 218. DC / DC converter 217 can, for example, perform buck conversion and / or boost conversion, and can be implemented as a 3-level converter, for example, but those skilled in the art will understand that there is no limitation on the type.

[0059] The inverter 218 according to the embodiment can output AC power using the drive voltage VDD provided from the DC / DC converter 217. Multiple switches Q1, Q2, Q3, and Q4 can be configured, for example, as a full-bridge circuit, but the number of switches or the type of bridge circuit is not limited. For example, in the case of a full-bridge circuit configuration, one end of the transmitting coil 213 can be connected to the connection point between switches Q1 and Q2 via capacitor 212, and the other end of the transmitting coil 213 can be connected to the connection point between switches Q3 and Q4. Multiple switches Q1, Q2, Q3, and Q4 can be controlled to be in an on or off state. For example, to generate AC power, the controller 215 can control the first switch Q1 and the third switch Q3 to be on and the second switch Q2 and the fourth switch Q4 to be off for a first duration, and during a second duration, the controller 215 can control the first switch Q1 and the third switch Q3 to be off and the second switch Q2 and the fourth switch Q4 to be on, and can repeat the above control operations. The controller 215 can provide control signals Q1_DRV, Q2_DRV, Q3_DRV, and Q4_DRV to multiple switches Q1, Q2, Q3, and Q4 for generating the aforementioned AC power. Here, not only outputting control signals but also suppressing output control signals can be referred to as control by the controller 215. For example, the fact that the controller 215 outputs a first control signal to the inverter 218 for generating AC power with a first frequency can mean that the controller 215 outputs control signals Q1_DRV and Q3_DRV to control switches Q1 and Q3 to be in the ON state for a first duration corresponding to the first frequency, and then outputs control signals Q2_DRV and Q4_DRV to control switches Q2 and Q4 to be in the ON state for a second duration corresponding to the first frequency, and repeats the above output operation. The fact that controller 215 outputs a second control signal to inverter 218 for generating AC power with a second frequency means that controller 215 outputs control signals Q1_DRV and Q3_DRV to control switches Q1 and Q3 to be on for a first duration corresponding to the second frequency, and then outputs control signals Q2_DRV and Q4_DRV to control switches Q2 and Q4 to be on for a second duration corresponding to the second frequency, and repeats the above output operation. In this case, the first and second durations corresponding to the second frequency may differ from the first and second durations corresponding to the first frequency. At least one of DC / DC converter 217 or inverter 218 can be designated as a power supply circuit. Controller 215 can control the power supply circuit (e.g., at least one of DC / DC converter 217 or inverter 218) to apply power to transmitting coil 213.

[0060] According to an embodiment, AC power generated by inverter 218 can be applied to transmitting coil 213. Inverter 212 can be configured with a resonant circuit together with transmitting coil 213. Transmitting coil 213 can generate a magnetic field based on the applied AC power. A portion of the magnetic field (or magnetic flux) generated by transmitting coil 213 can pass through the cross-section of receiving coil 221 of wireless power receiving device 101. As the magnetic field passing through the cross-section of receiving coil 221 changes over time, an induced electromotive force (e.g., current, voltage, or electrical current) can be generated in receiving coil 221.

[0061] According to an embodiment, the demodulation circuit 214 can demodulate the signal applied to the transmitting coil 213 (e.g., the voltage 219 applied across the transmitting coil 213) and can output a demodulated signal (V). demod The demodulation circuit 214 can output a demodulated signal (V) by down-converting the signal applied to, for example, the transmitting coil 213 (e.g., the voltage 219 across its terminals) to the frequency of AC power (e.g., 100kHz to 210kHz). demod For example, demodulation circuit 214 may include mixer and / or multiplier circuitry for removing the carrier component (e.g., 100 kHz to 210 kHz as the frequency of AC power) used for wireless power transmission. Since a waveform in which the component resulting from modulation by wireless power receiving device 101 and the AC power component resulting from wireless power transmitting device 201 are mixed can be applied to the ends of coil 213 of wireless power transmitting device 201, the frequency component of AC power (e.g., 100 kHz to 210 kHz) is referred to as the carrier component, and those skilled in the art will understand that wireless power receiving device 101 does not actually generate electromagnetic waves in which the modulated data is mixed with the carrier. Therefore, the carrier component (e.g., a frequency of 100 kHz to 210 kHz as the frequency of AC power) can be removed from the voltage 219 at the ends of transmitting coil 213. Demodulation circuit 214 may further modify the demodulated signal (V... demod The demodulation circuit 214 may also include a low-pass filter. Alternatively, the demodulation circuit 214 may filter the voltage 219 at both ends of the transmitting coil 213 and then down-convert the filtered voltage to the frequency of AC power (e.g., 100kHz to 210kHz) to generate a demodulated signal (V). demod The amplitude of the voltage 219 at both ends of the transmitting coil 213 can be changed according to the ASK modulation of the wireless power receiving device 101. According to an embodiment, the controller 215 can be based on the demodulated signal (V) output by the demodulation circuit 214. demodThe controller 215 can identify information provided by the wireless power receiving device 101. For example, it can demodulate signals (V...) demod The controller 215 performs analog-to-digital conversion (ADC). It can decode the digital value obtained as an ADC result and identify information provided by the wireless power receiving device 101 based on the decoding result. Those skilled in the art will understand that the decoding method can be based on, for example, the Qi standard, but is not limited thereto. In the above embodiments, it has been described that the demodulation circuit 214 performs frequency down-conversion (e.g., carrier removal) and / or low-pass filtering, and the controller 215 performs analog-to-digital conversion (ADC) and / or decoding, but this is merely exemplary. Those skilled in the art will understand that the demodulation circuit 214 can be implemented to also perform at least one of ADC or decoding, and the controller 215 can be implemented to also perform frequency down-conversion (e.g., carrier removal) and / or low-pass filtering.

[0062] According to an embodiment, the wireless power receiving device 101 may include at least one of the following: a receiving coil 221; a capacitor 222; a capacitor 223; a rectifier circuit 255; a controller 250; a plurality of capacitors 261, 262, 263 and 264; a plurality of switches 231, 232, 233 and 234; a capacitor 241; a regulator 242; a capacitor 243; or a charger 244.

[0063] According to an embodiment, the receiving coil 221, capacitor 222, and capacitor 223 can be configured as a resonant circuit. One end of capacitor 222 can be connected to the receiving coil 221, and the other end of capacitor 222 can be connected to one end of capacitor 223 and one end of rectifier circuit 255. One end of capacitor 223 can be connected to the other end of capacitor 222, and the other end of capacitor 223 can be connected to the other end of receiving coil 221. In other words, capacitor 223 can be connected in parallel to a circuit in which receiving coil 221 and capacitor 222 are connected in series. The other end of capacitor 223 can be connected to the other end of rectifier circuit 255.

[0064] According to an embodiment, the rectifier circuit 255 may include multiple switches S1, S2, S3, and S4 configured as a full-bridge circuit. One end of the resonant circuit may be connected to the connection point between switches S1 and S2, and the other end of the resonant circuit may be connected to the connection point between switches S3 and S4. The rectifier circuit 255 can convert AC power received through the receiving coil 221 into DC power. The controller 250 can control the on / off states of the multiple switches S1, S2, S3, and S4, so that AC power can be converted into DC power.

[0065] According to an embodiment, capacitor 241 and voltage regulator 242 can be connected to rectifier circuit 255. One end of capacitor 241 can be grounded. Voltage regulator 242 can convert (e.g., buck conversion and / or boost conversion) and / or regulate the voltage of rectified power output from power conversion circuit.

[0066] According to an embodiment, charger 244 can charge a battery (not shown) using power converted and / or regulated by voltage regulator 242. According to an embodiment, charger 244 can control the voltage and / or current used to charge the battery according to the battery's charging mode (e.g., constant current (CC) mode, constant voltage (CV) mode, or fast charging mode). According to an embodiment, a PMIC (not shown) may be connected to voltage regulator 242 instead of charger 244.

[0067] According to an embodiment, controller 250 can perform modulation corresponding to the information to be provided. Controller 250 can determine which of a plurality of capacitors 261, 262, 263, and 264 will be used for modulation. Depending on the capacitor used for modulation, the difference in amplitude of voltage 219 sensed by wireless power transmitter 201 can be changed. For example, when modulation is performed only through one capacitor 261, it is assumed that the difference in amplitude of voltage 219 sensed by wireless power transmitter 201 (e.g., the difference between the maximum amplitude of voltage 219 during the time switch 231 is in the ON state and the maximum amplitude of voltage 219 during the time switch 231 is in the OFF state) is a first value. In this case, since capacitors 262, 263, and 264 are not used for modulation, switches 232, 233, and 234 can remain in the OFF state. When modulation is performed via capacitors 261 and 262, the difference in amplitude of voltage 219 sensed by wireless power transmitting device 201 (e.g., the difference between the maximum amplitude of voltage 219 during the time switches 231 and 232 are on and the maximum amplitude of voltage 219 during the time switches 231 and 232 are off) can be a second value, and the second value can be greater than the first value. In this case, since capacitors 263 and 264 are not used for modulation, switches 233 and 234 can remain in the off state. Wireless power receiving device 101 can adjust the modulation depth (or modulation intensity) by adjusting the capacitors to be modulated among the plurality of capacitors 261, 262, 263, and 264. As described above, while performing modulation using the determined capacitors, controller 250 can output or suppress at least some of the output control signals (CMA1, CMA2, CMB1, and CMB2) such that the switch corresponding to the undetermined capacitor remains in the off state. For example, the capacitance of capacitor 262 can be smaller than that of capacitor 261, and the capacitance of capacitor 264 can be smaller than that of capacitor 263. However, this is just an example, and there is no limit to the size of the capacitance, and the capacitance can be the same.

[0068] The above Figure 3 The controller 215 described herein may be referred to as a control circuit and may be a microcontroller unit (MCU), a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), at least one processor, or an application processor (AP). The controller 250 may be referred to as a control circuit and may be a microcontroller unit (MCU), a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), at least one processor, or an application processor (AP).

[0069] Refer again Figure 2According to an embodiment, the controller 215 of the wireless power transmitter 201 can recognize when an external object is placed (e.g., arranged or attached) on or removed from the charging area 203, and can perform a first ping operation (e.g., a Q ping operation) during the ping phase to determine the presence of a foreign object (e.g., distinguishing between objects capable of receiving wireless power and foreign objects). During the first ping operation, the controller 215 can determine whether the external object has moved to prevent the object from being incorrectly identified as a foreign object (Q-FOD) during the ping phase, even if it is a device capable of receiving wireless power and being charged (e.g., the wireless power receiver 101). Here, the charging area 203 of the wireless power transmitter 201 can be configured as part of the housing of the wireless power transmitter 201 (e.g., a surface opposite to a surface placed on a bottom or top surface). The first ping operation can be an operation of outputting a first ping signal (e.g., applying first power) to the transmitting coil 213 for a specified time by applying a first current output from the converter 217 to the inverter 218. Here, the first ping signal can be a Q ping signal and can be named "first power".

[0070] According to an embodiment, controller 215 may perform an operation (e.g., a preparation step or an initial Q ping operation) within a specified time period (e.g., 1.5 s) after wireless power transmitter 201 is turned on (e.g., powered on or Tx started) to obtain (e.g., detect, measure, or receive) reference information, and store or update the reference information in the memory of wireless power transmitter 201. Here, the reference information may include at least one of the following: voltage and / or current detected by the first ping operation when an object is not placed on charging area 203, a reference quality (Q) factor value, a reference frequency, and a reference L / R value (e.g., a value related to the calculation of Q value (Q = 2πf L / R)).

[0071] According to an embodiment, controller 215 can control inverter 218, included in the power supply circuit, to output a first ping signal (e.g., apply first power) to transmitting coil 213 during a specified ping period (e.g., 550ms) when performing a first ping operation. Here, the first power may be power transmitted through transmitting coil 213 at a first frequency to identify whether an external object is detected (e.g., present, detected, or identified) in charging region 203 during the first ping operation. According to an embodiment, controller 215 can detect information (e.g., first information) related to the first ping operation when performing the first ping operation (e.g., applying first power) to transmitting coil 213. Here, the information related to the first ping operation may include at least one of a quality factor (Q factor) value, resonant frequency, or L / R value detected when performing the first ping operation.

[0072] According to an embodiment, controller 215 can identify whether an external object is placed on charging region 203 based on information and reference information obtained related to the first ping operation. Controller 215 can identify whether an external object is placed on the charging region based on the difference between a Q-factor value included in the information related to the first ping operation and a reference factor value, and / or the difference between a resonant frequency included in the information related to the first ping operation and a reference frequency. When the reference factor value is greater than the detected Q-factor value and the detected resonant frequency is different from the reference frequency, controller 215 can identify that an external object is placed on charging region 203. When an external object is placed on charging region 203, the Q-factor may change (e.g., decrease), therefore, when the comparison result between the detected Q-factor value and the reference factor value has a difference outside the tolerance range, controller 215 can identify that an external object is placed on charging region 203. If the reference factor value is not greater than the detected Q factor value and the detected resonant frequency is the same as the reference frequency, the controller 215 can determine that there is no external object, continue to perform the first ping operation, and detect information related to the first ping operation during the execution of the first ping operation (e.g., within a specified time). Thereafter, the controller 215 can again identify whether an external object exists.

[0073] According to an embodiment, when an external object is detected on the charging area 203, the controller 215 can identify whether the external object has moved. For example, the controller 215 can identify (e.g., monitor) whether the external object has moved within a predetermined time period (e.g., a ping period). The controller 215 can compare a previously detected Q-factor value with the currently detected Q-factor value (or Q-factor value + tolerance), identify changes in the Q-factor value (e.g., obtain the amount of change), and if the previously detected Q-factor value is different from the currently detected Q-factor value (or Q-factor value + tolerance) and there is a change (or difference) in the Q-factor value, then the controller 215 can identify that there is movement of the external object. If the previously detected Q-factor value and the currently detected Q-factor value (or Q-factor value + tolerance) are the same, then the controller 215 can identify that there is no movement of the external object.

[0074] According to an embodiment, when the controller 215 detects that an external object has moved, the controller 215 may not perform a foreign object (FO) determination operation relative to the external object, and may perform a second ping operation to output a second ping signal for communication with the external object to the transmitting coil 213. Here, the second ping operation may be an operation of outputting a second ping signal to the transmitting coil 213 for a specified time by applying a second current output from the converter 217 to the inverter 218 (e.g., applying second power). Here, the second ping signal may be a digital (D) ping signal and may be named "second power". Here, the second power may be power transmitted by the transmitting coil 213 at a second frequency (e.g., a digital ping frequency of 127.7 kHz) for communication with the external object. According to an embodiment, when performing the second ping operation of outputting a second ping signal to the transmitting coil 213, if the external object is an object capable of receiving wireless power (e.g., wireless power receiving device 101) and not a foreign object, the wireless power transmitting device 201 may receive a response to the second ping operation (e.g., SSP) from the external object. The wireless power transmitter 201 and the wireless power receiver 101 can perform in-band communication, and the wireless power transmitter 201 can receive a response (e.g., valid data based on SSP or demodulation results) from the wireless power receiver 101 via in-band communication.

[0075] According to an embodiment, if no response is received during the second ping operation, the controller 215 can perform the Q-ping operation again when it is identified that the object has moved, without being certain of the presence of the foreign object, in order to prevent false foreign object detection (FOD) in which the external object is actually an object capable of receiving wireless power but is mistakenly identified as a foreign object.

[0076] According to an embodiment, when a response to a second ping operation is received during the execution of the second ping operation (e.g., applying a second ping signal), the controller 215 can identify an external object as an object capable of receiving wireless power (e.g., wireless power receiver 101), and can perform at least one operation corresponding to the identification phase and configuration phase with the external object. The corresponding operation may follow, for example, the Qi standard, but is not limited thereto. After performing the configuration phase, the controller 215 can perform a negotiation phase and a power transmission phase. The controller 215 can perform a foreign object detection (FOD) operation during the negotiation and power transmission phases using the Q factor obtained in the Q ping phase (e.g., the Q factor obtained before (or immediately before) receiving the response). If no foreign object is detected, the controller 215 can continue to transmit power (e.g., third power) for wireless charging to the object capable of receiving wireless power identified in the power transmission step (e.g., wireless power receiver 101). If a foreign object is detected, the controller 215 can stop transmitting power for wireless charging.

[0077] According to an embodiment, during the second ping operation (e.g., outputting the second ping signal (D ping signal) during the ping phase, the controller 215 of the wireless power transmitting device 201 can identify that an external object (e.g., the wireless power receiving device 101) is placed on the charging area. Since the controller 215 does not detect information such as the Q factor and resonant frequency during the second ping operation, it can compare the reference information stored in its memory with the information related to the first ping operation obtained in the previous first ping operation. If, as a result of the comparison, there is no difference between the reference information and the information related to the first ping operation, the controller 215 can identify that an external object was placed on the charging area during the second ping operation. Therefore, the controller 215 can perform the first ping operation (Q ping operation) again.

[0078] Therefore, in the above embodiments, it has been described that... Figure 2 and Figure 3 The main component of the wireless power transmission device 201. However, in various embodiments, not Figure 2 and Figure 3 All components shown are necessary, and the wireless power transmission device 201 can be implemented with more or fewer components than those shown. Furthermore, the above... Figure 2 and Figure 3 The positions of the main components of the described wireless power transmission device 201 can be varied according to various embodiments.

[0079] According to an embodiment, a wireless power transmission device (e.g., Figure 2 and Figure 3 The wireless power transmission device 201 may include a transmitting coil 213, a power supply circuit, a memory, and a controller 215 electrically connected to the transmitting coil, the power supply circuit, and the memory.

[0080] According to an embodiment, the controller can be configured to control the power supply circuit to apply a first power to the transmitting coil during the first ping operation.

[0081] According to an embodiment, the controller can be configured to detect first information related to the first ping operation when performing the first ping operation, and store the first information in a memory.

[0082] According to an embodiment, the controller can be configured to identify an external object placed on the charging area 203 of the housing of the wireless power transmitter based on first information and reference information.

[0083] According to an embodiment, the controller can be configured to detect second information related to the first ping operation by re-executing the first ping operation, and to identify the movement of an external object based on the difference between the first information and the second information.

[0084] According to an embodiment, the controller can be configured to control the power supply circuit to apply a second power to the transmitting coil for communicating with an external object during a second ping operation.

[0085] According to an embodiment, the controller can be configured to perform foreign object detection (FOD) operations and / or send power to an external object for wireless charging based on the recognition that a response from an object is received during the execution of a second ping operation.

[0086] According to an embodiment, the controller can be configured to re-execute the first ping operation based on the recognition that a response from an external object was not received when the second ping operation was performed.

[0087] According to an embodiment, the information associated with the first ping operation may include at least one of the Q factor of the first ping operation or the resonant frequency of the first ping operation.

[0088] According to an embodiment, the controller can be configured to, when performing a first ping operation, detect the resonant frequency based on the voltage corresponding to the first power detected at the transmitting coil, and identify that an external object is placed on the charging area based on the difference between the Q factor and the reference factor included in the reference information and / or the difference between the resonant frequency and the reference frequency.

[0089] According to an embodiment, the controller can be configured to identify that an external object is placed on the charging area based on a reference factor greater than the Q factor and a resonant frequency different from the reference frequency.

[0090] According to an embodiment, the reference factor is a Q factor detected when performing the first ping operation with no external object placed on the charging area, and can be previously stored in the memory of the wireless power transmission device.

[0091] According to an embodiment, the reference frequency is the resonant frequency detected when the first ping operation is performed with no external object placed on the charging area, and is previously stored in the memory.

[0092] According to an embodiment, the controller can be configured to identify that an object is not placed on the charging area based on a reference factor not greater than the Q factor and a resonant frequency corresponding to the reference frequency, and to re-execute the first ping operation.

[0093] According to an embodiment, the controller can be configured to identify that the currently detected Q factor has not changed by comparing the previously detected Q factor with the currently detected Q factor, thereby identifying that the external object has not moved, and perform the operation of determining whether there is a foreign object on the charging area.

[0094] According to an embodiment, the controller can be configured to, after re-performing the first ping operation, perform an operation to determine whether there is a foreign object on the charging area and perform a second ping operation based on the recognition that the external object has not moved.

[0095] According to an embodiment, the controller can be configured to identify the external object as a wireless power receiver based on a response received from the external object, and control the power supply circuit to apply a third power for wireless charging of the wireless power receiver to the transmitting coil.

[0096] Figure 4 This is a diagram illustrating an example of an operation method of a wireless power transmission device according to an embodiment, and Figure 5 This is a diagram illustrating an example of an operation method of a wireless power transmission apparatus according to an embodiment. In the following embodiments, each operation may be performed sequentially, but not necessarily sequentially. For example, the order of the operations may be changed, and at least two operations may be performed in parallel.

[0097] Reference Figure 4 and Figure 5 Before performing operation 401, the wireless power transmission device 201 according to the embodiment (e.g., Figure 2 and Figure 3The wireless power transmitter 201 can be activated after the wireless power transmitter 201 is turned on (e.g., powered on or Tx-activated) and before an external object is placed (e.g., in the event of...). Figure 5 When the first ping signal is output during the t1 period, information related to the first ping operation is obtained (e.g., detected, measured, or received), and the obtained information related to the first ping operation can be stored or updated as reference information in the memory of the wireless power transmitting device 201. The reference information may include information provided that an external object 101 is not placed in the charging area (e.g., when the first ping signal is output). Figure 2 In the state of the charging region 203), at least one of the following is detected by a first ping operation (e.g., Q ping): a reference quality (Q) factor value, a reference frequency (F) value, or a reference L / R value.

[0098] Refer again Figure 4 and Figure 5 In operation 401, the wireless power transmitting device according to the embodiment can perform a first ping operation. For example, the first ping operation can be an operation of outputting a first ping signal 501 (e.g., applying first power) from a power supply circuit (e.g., a first current output from a converter is applied to an inverter) to the transmitting coil 213. Here, the first ping signal 501 is a Q ping signal and can be referred to as "first power". In the embodiment, a first ping operation and a second ping operation can be performed. For example, the first ping signal 501 can be an analog ping or a Q ping signal and can be transmitted with "first power", and the second ping signal 503 can be a digital ping or a D ping signal and can be transmitted with "second power". In operation 403, the wireless power transmitting device 201 can obtain information 511 related to the first ping operation (e.g., Q detection). For example, the information 511 related to the first ping operation can include at least one of a quality factor (Q factor) value, a resonant frequency, or an L / R value detected during the first ping operation.

[0099] In operation 405, the wireless power transmitter 201 can compare the acquired information 511 related to the first ping operation with reference information to identify whether an external object 101 has been detected. If, as a result of the detection, the external object 101 is detected, the wireless power transmitter 201 can identify, based on the information 511 related to the first ping operation and the reference information, that the external object 101 (e.g., the wireless power receiver 101) is placed in the charging area of ​​the housing of the wireless power transmitter 201 (e.g., ...). Figure 2 On the charging area 203), operation 407 can then be performed. In such a case... Figure 5During time period t2 of the ping phase shown, the wireless power transmitter 201 can identify that an external object 101 is placed on the charging area. As a result of the identification in operation 405, if the external object is not identified, the wireless power transmitter 201 can identify that no external object is placed on the charging area, and can then repeat operation 401. According to an embodiment, the wireless power transmitter 201 can identify whether the external object 101 is placed on the charging area based on the difference between the Q factor value (Q_Value) included in the information 511 related to the first ping operation and the reference factor value included in the reference information, and / or the difference between the resonant frequency (F_Value) included in the information 511 related to the first ping operation and the reference frequency. If the reference factor value is greater than the detected Q factor value and the detected resonant frequency is different from the reference resonant frequency, the wireless power transmitter 201 can identify that the external object is placed on the charging area. When an external object 101 is placed on the charging area, the Q factor can change (e.g., decrease), and therefore, if the comparison between the detected Q factor value and the reference factor value has a difference outside the tolerance range, the wireless power transmitter 201 can identify that an external object 101 is placed on the charging area. If the reference factor value is not greater than the detected Q factor value and the detected resonant frequency is the same as the reference resonant frequency, the wireless power transmitter 201 can determine that no external object 101 exists and can continue to perform the first ping operation in operation 401.

[0100] In operation 407, the wireless power transmitting device 201 can identify whether the external object 101 has moved based on changes in information related to the first ping operation. According to an embodiment, the wireless power transmitting device 201 can compare a previously detected Q-factor value (e.g., the Q-factor value of the first ping operation related information 512) with the currently detected Q-factor value (or Q-factor value + tolerance) to identify changes in the Q-factor value (e.g., obtain the amount of change).

[0101] As a result of the identification in operation 407, if it is identified that the external object 101 has been moved due to a change in information related to the first ping operation (operation 407 = Yes), the wireless power transmitter 201 can execute operation 415. For example, when the user moves the external object 101 to the center of the charging area to correctly place the external object 101 on the charging area (because the external object 101 was incorrectly placed at the edge of the charging area), the wireless power transmitter 201 can obtain information 512 related to the changed first ping operation. Here, the wireless power transmitter 201 can compare the previously obtained information 511 related to the first ping operation with the currently obtained information 512 related to the first ping operation, and if the currently obtained information 512 related to the first ping operation has changed (e.g., the currently detected Q factor value is lower than the previously detected Q factor value), the wireless power transmitter 201 can identify that the external object 101 has been moved. Here, the external object 101 whose movement is identified can be an object capable of receiving power (e.g., Figure 1 , Figure 2 , Figure 3 and Figure 5 (e.g., wireless power receiving device 101). For example, such as... Figure 5 As shown, the t2 time period of the ping phase can be a specified ping time period (e.g., 550ms), and operations 401 to 407 can be performed during the t2 and t3 time periods of the ping phase to obtain information 511 and 512 related to the first ping operation, to identify the external object 101, and to identify whether the external object 101 has been moved. According to an embodiment, if the previously detected Q factor value (e.g., the Q factor value included in the information 511 related to the first ping operation) and the currently detected Q factor value (or Q factor value + tolerance) (e.g., the Q factor value included in the information 512 related to the first ping operation (or Q factor value + tolerance)) are different and there is a change (or difference) in the Q factor value (e.g., in Figure 5 If the detected Q factor value is low during the t3 and / or t4 time periods, then the wireless power transmitting device 201 can identify the presence of movement of the external object 101.

[0102] As a result of the identification in operation 407, if it is identified that the external object 101 has not been moved (operation 407 = No), the wireless power transmitting device 201 can execute operation 409. According to an embodiment, if the previously detected Q factor value (e.g., the Q factor value included in the information 511 related to the first ping operation) is the same as the currently detected Q factor value (or Q factor value + tolerance) (e.g., the Q factor value included in the information 512 related to the first ping operation (or Q factor value + tolerance)), the wireless power transmitting device 201 can identify that the external object 101 is in a state of no movement.

[0103] In operation 409, the wireless power transmitting device 201 can identify whether a foreign object is present on the external object 101 placed on the charging area based on information 512 related to the first ping operation. Here, the operation of identifying the presence of a foreign object can be based on... Figure 5 The foreign object detection (FOD) operation performed during the t5 period is an operation that preliminarily identifies the presence of foreign objects in the charging area by obtaining (or detecting) information related to the first ping operation during the ping phase (511 to 513).

[0104] As a result of the identification in operation 409, if a foreign object is identified (operation 409 - Yes), then in operation 411, the wireless power transmitter 201 can configure information indicating the presence of a foreign object. After performing operation 411, the wireless power transmitter 201 can perform operation 415. According to an embodiment, if the last detected Q factor value (Q_Last) (e.g., the detected Q factor value included in information 512 or 513 related to the first ping operation) is less than the threshold factor value (thr_Q1) and the last detected resonant frequency (F_Last) (e.g., the resonant frequency included in information 512 related to the first ping operation) is greater than the threshold frequency (thr_F1), then the wireless power transmitter 201 can identify the presence of a foreign object (FO) in the external object 101. Here, the information indicating the presence of a foreign object may include a foreign object flag value (e.g., FO flag = 1), a last resonant frequency value (e.g., F_Last), and a last Q factor value (e.g., Q_Last).

[0105] As a result of the identification in operation 409, if no foreign object is identified (operation 409 - No), then in operation 413, the wireless power transmitter 201 can configure information indicating the absence of a foreign object. After performing operation 413, the wireless power transmitter 201 can perform operation 415. According to an embodiment, if the Q factor value (e.g., the last detected Q factor value (Q_Last)) included in the information 512 related to the first ping operation is not less than a threshold factor value, and the resonant frequency (e.g., the last detected resonant frequency (F_Last)) included in the information 512 related to the first ping operation is not greater than a threshold frequency, then the wireless power transmitter 201 can identify the absence of a foreign object. Here, the information indicating the absence of a foreign object may include a foreign object flag value (e.g., FO flag = 0), a previously detected resonant frequency value (e.g., F_value), and a previously detected Q factor value (e.g., Q_value).

[0106] In operation 415, the wireless power transmitter 201 can perform a second ping operation, for outputting a second ping signal (D ping signal) 503 from the power supply circuit to the transmitting coil for communication with an external object 101 (e.g., in...). Figure 5 In the third time period, a D ping signal is output. Here, the second ping operation can be an operation of outputting a second ping signal 503 to the transmitting coil 213 for a specified time by applying a second current output from converter 217 to inverter 218 (e.g., applying a second power). Here, the second ping signal 503 can be a digital (D) ping signal and can be named "second power supply". Here, the second power can be power transmitted by transmitting coil 213 at a second frequency (e.g., a digital ping frequency of 127.7 kHz) for communication with external object 101.

[0107] In operation 417, the wireless power transmitting device 201 can identify whether a response to the second ping operation is received from the external object 101 when the second ping operation is performed.

[0108] As a result of the identification in operation 417, if no response is received (operation 417 - No), the wireless power transmitting device can again perform the first ping operation in operation 401, which outputs the first ping signal (e.g., in...). Figure 5During the fourth time period, a Q-ping signal is output, and information 513 related to the first ping operation can be obtained. According to an embodiment, the wireless power transmitting device 201 can repeatedly perform the above operations 403 to 407 to identify the external object 101 and determine whether the external object 101 has been moved. If no response is received during the second ping operation, the wireless power transmitting device 201 according to the embodiment can perform the Q-ping operation of operation 401 again when it is identified that the external object 101 has been moved, without identifying the presence of a foreign object in operation 409, to prevent false foreign object detection (FOD) in which the external object 101 is actually an object capable of receiving wireless power but is mistakenly identified as a foreign object.

[0109] As a result of the identification in operation 417, if a response is received (operation 417 - Yes), the wireless power transmitting device 201 can perform operation 419.

[0110] In operation 419, the wireless power transmitting device 201 can perform a foreign object detection (FOD) operation (e.g., Figure 5The wireless power transmitting device 201 can identify an external object 101 as an object capable of receiving wireless power (e.g., a wireless power receiving device 101) when a response to a second ping operation (e.g., a signal strength packet (SSP)) (521) is received during the second ping operation (e.g., applying a second ping signal 503), and can perform at least one operation corresponding to the identification phase and the configuration phase with the external object 101, and the corresponding operation may follow, for example, the Qi standard, but is not limited thereto. After performing the configuration phase, the controller 215 can perform a negotiation phase 523 and a power transmission phase (e.g., the t5 period). According to an embodiment, the wireless power transmitting device 201 can perform foreign object detection (FOD) operations 531 and 532 in the negotiation phase 523 and the power transmission phase (e.g., the t5 period) by using a Q factor (e.g., a Q factor obtained in the Q ping phase (e.g., a Q factor obtained before (or immediately before) receiving a response)). According to an embodiment, if no foreign object is detected, the wireless power transmitter 201 can continue transmitting power (e.g., third power) for wireless charging to an external object 101 (e.g., wireless power receiver 101) identified as capable of receiving wireless power during the power transmission step (e.g., the t5 interval). If a foreign object is detected by the foreign object detection (FOD) operation, the wireless power transmitter 201 can stop transmitting power for wireless charging. If a foreign object is detected by the foreign object detection (FOD) operation, the wireless power transmitter 201 can configure the transmitted power for wireless charging to low.

[0111] Figure 6a and Figure 6b This is a diagram illustrating an example of an operation method of a wireless power transmission device according to an embodiment.

[0112] Reference Figure 6a According to the embodiment, the wireless power transmitting device 201 can identify that a foreign object is first placed during time period t2 (605), and can perform a second ping operation (e.g., in the ping phase) for outputting a second ping signal (D ping signal) 603 (e.g., in Figure 6aDuring the t4 period, when the D ping signal 603 is output, it is identified that an external object 101 (e.g., a wireless power receiving device 101) is placed on the charging area. During the t4 period, the wireless power transmitting device 201 can receive a response signal (e.g., SSP). If there is no difference between the reference information stored in the memory and the information (612) related to the first ping operation obtained according to the previous first ping operation (e.g., the Q ping operation of outputting the Q ping signal 601), the wireless power transmitting device 201 can identify that the external object 101 was placed on the charging area during the second ping operation. The wireless power transmitting device 201 can perform the first ping operation (Q ping operation) again to identify the movement of the external object 101, identify the movement, and identify the presence of a foreign object (FO). Since the wireless power transmitter 201 has detected a foreign object attachment 605, it can perform Q-factor Foreign Object Detection (Q-FOD) operation 621 during the configuration or negotiation phase, and then determine to stop Tx transmission 622 before entering the power transmission phase (e.g., time period t5). In an embodiment, the power transmitter 201 can identify the power loss state based on power information received from the external object 101 (Received Power Packet (RPP) and Signal Strength Packet (SSP)), and can determine to stop Tx transmission 622 based on whether a foreign object has been detected. Here, the external object 101 can be a wireless receiver capable of receiving power and can operate under an Extended Power Profile (EPP).

[0113] Reference Figure 6a According to the embodiment, the wireless power transmitting device 201 can identify foreign object (FO) and external object 101 being placed (e.g., attached) on the edge (607) of the charging area during time period t2, and can perform a first ping operation (Q ping operation) to identify the movement of foreign object (FO) and / or external object 101 and to identify the presence of foreign object (FO). Upon performing a second ping operation (e.g., during...), Figure 6aWhen the external object 101 (e.g., a wireless power receiver 101) outputs a D ping signal 603 during time periods t3 and t4, it can be identified as being placed on the charging area. During time periods t3 and / or t4, the wireless power transmitter 201 can receive a response signal (e.g., an SSP). When the foreign object (FO) and the external object 101 are attached together, the wireless power transmitter 201 can perform Q-factor foreign object detection (Q-FOD) operation 621 during the configuration or negotiation phase, and can stop Tx transmission 632 during the power transfer phase 630. In an embodiment, the power transmitter 201 can identify a power loss state based on power information received from the external object 101 (Received Power Packet (RPP) and Signal Strength Packet (SSP)), and can determine to stop Tx transmission 622 based on whether the foreign object is identified. Here, the external object 101 can be a wireless receiver capable of receiving power and can operate under an Extended Power Profile (EPP).

[0114] Reference Figure 6b According to the embodiment, the wireless power transmitting device 201 can identify that a foreign object is first placed during time period t2 (605), and can perform a second ping operation (e.g., in the ping phase) for outputting a second ping signal (D ping signal) 603 (e.g., in Figure 6a During the t4 period, when the D ping signal 603 is output, it is identified that an external object 101 (e.g., a wireless power receiving device 101) is placed on the charging area. During the t4 period, the wireless power transmitting device 201 can receive a response signal (e.g., an SSP). The wireless power transmitting device 201 can perform a first ping operation (Q ping operation) to identify the movement of the external object 101, identify the movement, and identify the presence of a foreign object (FO). Since the wireless power transmitting device 201 has identified the foreign object attachment 605, it can perform a Q-factor foreign object detection (Q-FOD) operation 631 in the power transmission phase 630, and then can stop Tx transmission 632. In an embodiment, the power transmitting device 201 can identify the power loss state based on the power information received from the external object 101 (received power packets (RPP) and signal strength packets (SSP)), and can determine to stop Tx transmission 622 based on whether the foreign object has been identified. Here, the external object 101 can be a wireless receiver capable of receiving power and can operate under a Base Power Profile (BPP).

[0115] Reference Figure 6bAccording to the embodiment, the wireless power transmitting device 201 can identify during time period t2 that both a foreign object (FO) and an external object 101 are placed (e.g., attached) on the edge (609) of the charging area, and can perform a first ping operation (Q ping operation) to identify the movement of the external object 101 and to identify the presence of a foreign object (FO). Upon performing a second ping operation (e.g., during...), Figure 6b When the D ping signal 603 is output during time periods t3 and t4, the external object 101 (e.g., wireless power receiving device 101) can be identified as being placed on the charging area. During time periods t3 and / or t4, the wireless power transmitting device 201 can receive a response signal (e.g., SSP). When the foreign object (FO) and the external object 101 are attached together, the wireless power transmitting device 201 can perform Q-factor foreign object detection (Q-FOD) operation 621 during the negotiation phase, perform power loss foreign object detection (power loss FOD) operation 633 during the power transmission phase 630, and stop Tx transmission 634 during the power transmission phase 630. In an embodiment, the power transmitting device 201 can identify the power loss state based on power information received from the external object 101 (received power packets (RPP) and signal strength packets (SSP)), and can determine to stop Tx transmission 622 based on whether the foreign object is identified. Here, the external object 101 can be a wireless receiver capable of receiving power and can operate under both Extended Power Profile (EPP) and Basic Power Profile (BPP).

[0116] According to an embodiment, the wireless power transmission device (e.g., Figure 2 and Figure 3 The method of the wireless power transmitting device 201 may include applying a first power to the transmitting coil 213 of the wireless power transmitting device through the power supply circuit of the wireless power transmitting device during the first ping operation.

[0117] According to an embodiment, the method may include detecting first information related to the first ping operation when performing the first ping operation, and storing the first information in a memory.

[0118] According to an embodiment, the method may include identifying an external object placed on the charging area 203 of the housing of the wireless power transmitting device based on first information and reference information.

[0119] According to an embodiment, the method may include detecting second information related to the first ping operation by re-performing the first ping operation, and identifying the movement of an external object based on the difference between the first information and the second information.

[0120] According to an embodiment, the method may include, in a second ping operation, applying a second power supply to the transmitting coil via a power supply circuit for communicating with an object.

[0121] According to an embodiment, the method may include performing foreign object detection (FOD) and sending power to the external object for wireless charging based on the recognition that a response from an object is received during the execution of a second ping operation.

[0122] According to an embodiment, the method may further include re-performing the first ping operation based on the recognition that a response from an external object was not received when the second ping operation was performed.

[0123] According to an embodiment, the information associated with the first ping operation may include at least one of the Q factor of the first ping operation or the resonant frequency of the first ping operation.

[0124] According to an embodiment, detecting information related to the first ping operation may include detecting the resonant frequency based on the voltage corresponding to the first power detected at the transmitting coil when the first ping operation is performed.

[0125] According to an embodiment, identifying an external object may include identifying that the external object is placed on the charging area based on the difference between the Q factor and the reference factor included in the reference information and / or the difference between the resonant frequency and the reference frequency.

[0126] According to an embodiment, identifying an external object may include identifying that the external object is placed on the charging area based on a reference factor greater than the Q factor and a resonant frequency different from the reference frequency.

[0127] According to an embodiment, the reference factor is a Q factor detected when performing the first ping operation with no external object placed on the charging area, and can be previously stored in the memory of the wireless power transmission device.

[0128] According to an embodiment, the reference frequency is the frequency detected when the first ping operation is performed while the external object is not placed on the charging area, and it can be previously stored in memory.

[0129] According to an embodiment, the method may further include identifying that an external object is not placed on the charging area based on a reference factor not greater than the Q factor and a resonant frequency corresponding to the reference frequency, and re-performing the first ping operation.

[0130] According to an embodiment, the method may further include identifying that the currently detected Q factor has not changed by comparing the previously detected Q factor with the currently detected Q factor, identifying that the external object has not moved, and determining whether there is a foreign object on the charging area.

[0131] According to an embodiment, the method may further include determining whether there is a foreign object on the charging area after re-performing the first ping operation, based on the identification that the external object has not moved.

[0132] According to an embodiment, sending power to an external object for wireless charging may include identifying the external object as a wireless power receiving device based on a response received from the external object, and applying a third power for wireless charging of the wireless power receiving device to the transmitting coil through a power supply circuit.

[0133] According to an embodiment, in a non-transitory storage medium storing a program, when executed by a processor of the wireless power transmitter, the program may include instructions that cause the wireless power transmitter to perform: applying a first power to the transmitting coil 213 of the wireless power transmitter via the power supply circuit of the wireless power transmitter during a first ping operation; detecting first information related to the first ping operation during execution of the first ping operation and storing the first information in a memory; identifying an external object placed on the charging area 203 of the housing of the wireless power transmitter based on the first information and reference information; detecting second information related to the first ping operation by re-executing the first ping operation; identifying the movement of the external object based on the difference between the first information and the second information; applying a second power for communicating with the object to the transmitting coil via the power supply circuit during a second ping operation; and performing foreign object detection (FOD) and sending power for wireless charging to the external object based on the received response from the object during the execution of the second ping operation.

[0134] In this disclosure, when the wireless power receiving device capable of wireless charging is moved outside the central area of ​​the charging area, the wireless power transmitting device can prevent erroneous detection of foreign objects included in the wireless power receiving device by mistakenly identifying them. Foreign objects (e.g., metallic foreign objects) can be clearly detected through the operating method of the wireless power transmitting device, and problems caused by temperature rise due to foreign objects can be prevented. In addition to the above, various effects that can be directly or indirectly identified by this disclosure can be provided. The effects obtainable according to this disclosure are not limited to the above-described effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

[0135] Furthermore, the embodiments disclosed herein are provided for the purpose of describing and understanding the technical content and are not intended to limit the scope of the technology described herein. Therefore, the scope of this disclosure should be interpreted to include all modifications or various other embodiments based on the technical ideas of this disclosure.

[0136] 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.

[0137] 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 “connected to another element (e.g., a second element)”, it means that the element can be directly (e.g., wiredly) connected to the other element, wirelessly connected to the other element, or connected to the other element via a third element.

[0138] As used in connection with various embodiments of this disclosure, the term "module" may include a unit implemented in hardware, software, or firmware, and may be used interchangeably with other terms such as "logic," "logic block," "part," or "circuit." A module may 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 embodiments, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

[0139] 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" simply means 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.

[0140] 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).

[0141] According to various embodiments, each of the above-described components (e.g., a module or program) may include a single entity or multiple entities, and some of the multiple entities may be separately disposed in different components. 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 before 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.

Claims

1. A wireless power transmitting device (201), comprising: a transmitting coil (213); a power supply circuit; a memory; and a controller (215) electrically connected to the transmitting coil, the power supply circuit, and the memory; wherein the controller is configured to: control the power supply circuit to apply first power to the transmitting coil in a first ping operation; detect first information related to the first ping operation while the first ping operation is performed, and store the first information in the memory; identify an external object placed on a charging area (203) of a housing of the wireless power transmitting device based on the first information and reference information; detect second information related to the first ping operation by re-performing the first ping operation, and identify a movement of the external object based on a difference between the first information and the second information; control the power supply circuit to apply second power for communication with the external object to the transmitting coil in a second ping operation; and based on identifying that a response from the external object is received while the second ping operation is performed, perform an operation of foreign object detection (FOD) and / or an operation of transmitting power for wireless charging to the external object. the controller is configured to: 2.The wireless power transmitting device of claim 1, wherein, based on identifying that the response from the external object is not received while the second ping operation is performed, re-perform the first ping operation. 3.The wireless power transmitting device of claim 1 or claim 2, the information related to the first ping operation includes at least one of a Q-factor of the first ping operation or a resonance frequency of the first ping operation, wherein, wherein the controller is configured to: detect the resonance frequency based on a voltage corresponding to the first power that is detected at the transmitting coil while the first ping operation is performed; identify that the external object is placed on the charging area based on a difference between the Q-factor and a reference factor included in the reference information and / or a difference between the resonance frequency and a reference frequency; identify that the external object is placed on the charging area based on the reference factor being greater than the Q-factor and the resonance frequency being different from the reference frequency; and identify that the external object is not placed on the charging area based on the reference factor not being greater than the Q-factor and the resonance frequency corresponding to the reference frequency, and re-perform the first ping operation, wherein the reference factor is the Q-factor detected while the first ping operation is performed in a state in which the external object is not placed on the charging area, and is previously stored in the memory of the wireless power transmitting device, and wherein the reference frequency is the resonance frequency detected while the first ping operation is performed in a state in which the external object is not placed on the charging area, and is previously stored in the memory. the controller is configured to:

4. The wireless power transmitting device of any one of claims 1 to 3, wherein, based on identifying that a currently detected Q-factor is not changed by comparing the previously detected Q-factor with the currently detected Q-factor, identify that the external object is not moved, and perform an operation of determining whether a foreign object is present on the charging area; and after re-performing the first ping operation, based on identifying that the external object is not moved, perform the operation of determining whether the foreign object is present on the charging area and perform the second ping operation. the controller is configured to: 5.The wireless power transmitting device of any one of claims 1 to 4, wherein, ​ identifying the external object as a wireless power receiver based on receiving a response from the external object; and controlling the power supply circuit to apply third power for wireless charging of the wireless power receiver to the transmission coil. 6.A method of operating a wireless power transmission device (201), comprising: applying, by a power supply circuit of the wireless power transmission device, first power to a transmission coil (213) of the wireless power transmission device in a first ping operation; detecting first information related to the first ping operation while the first ping operation is performed, and storing the first information in a memory; identifying an external object placed on a charging area (203) of a housing of the wireless power transmission device based on the first information and reference information; detecting second information related to the first ping operation by re-performing the first ping operation, and identifying movement of the external object based on a difference between the first information and the second information; applying, by the power supply circuit, second power for communication with the object to the transmission coil in a second ping operation; and based on identifying that a response from the object is received while the second ping operation is performed, performing a foreign object detection (FOD) and transmitting power for wireless charging to the external object. 7.The method of claim 6, further comprising re-performing the first ping operation based on identifying that the response from the external object is not received while the second ping operation is performed. 8.The method of claim 6 or claim 7, the information related to the first ping operation includes at least one of a Q factor of the first ping operation or a resonance frequency of the first ping operation, wherein wherein detecting the information related to the first ping operation includes detecting the resonance frequency based on a voltage corresponding to the first power detected at the transmission coil while the first ping operation is performed, and wherein identifying the external object includes identifying that the external object is placed on the charging area based on a difference between the Q factor and a reference factor included in the reference information and / or a difference between the resonance frequency and a reference frequency. 9.The method of any one of claims 6 to 8, identifying the external object includes identifying that the external object is placed on the charging area based on the reference factor being greater than the Q factor and the resonance frequency being different from the reference frequency, wherein wherein the reference factor is the Q factor detected while the first ping operation is performed in a state that the external object is not placed on the charging area, and is previously stored in a memory of the wireless power transmission device, and wherein the reference frequency is a frequency detected while the first ping operation is performed in the state that the external object is not placed on the charging area, and is previously stored in the memory. 10.The method of any one of claims 6 to 9, further comprising identifying that the external object is not placed on the charging area based on the reference factor not being greater than the Q factor and the resonance frequency corresponding to the reference frequency, and re-performing the first ping operation. ​ 11.The method of any one of claims 6-10, further comprising identifying, based on identifying that the currently detected Q-factor has not changed by comparing the previously detected Q-factor to the currently detected Q-factor, that the foreign object has not moved, and determining whether a foreign object is present on the charging area. 12.The method of any one of claims 6-11, further comprising determining, based on identifying that the foreign object has not moved, whether a foreign object is present on the charging area after re-performing the first ping operation. 13.The method of any one of claims 6-12, wherein, transmitting power for wireless charging to the foreign object comprises: identifying, based on receiving a response from the foreign object, that the foreign object is a wireless power reception device; and applying, by the power supply circuit, third power for wireless charging of the wireless power reception device to the transmit coil.

14. A non-transitory storage medium storing a program, wherein, The program, when executed by at least one processor (215) of a wireless power transmission device (201), includes instructions that cause the wireless power transmission device to perform: applying, by a power supply circuit of the wireless power transmission device, first power to a transmit coil (213) of the wireless power transmission device in a first ping operation; detecting first information related to the first ping operation while performing the first ping operation, and storing the first information in a memory; identifying, based on the first information and reference information, a foreign object placed on a charging area (203) of a housing of the wireless power transmission device; detecting second information related to the first ping operation by re-performing the first ping operation, and identifying movement of the foreign object based on a difference between the first information and the second information; applying, by the power supply circuit, second power for communication with the object to the transmit coil in a second ping operation; and based on identifying that a response from the object is received while performing the second ping operation, performing a foreign object detection (FOD) and transmitting power for wireless charging to the foreign object.

15. The non-transitory storage medium of claim 14, wherein, The program, when executed by a processor of the wireless power transmission device, includes instructions that cause the wireless power transmission device to further perform re-performing the first ping operation based on identifying that a response from the foreign object is not received while performing the second ping operation.

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