KR102698751B1 - Wireless power transmitting device and method - Google Patents

Abstract

Various embodiments relate to a wireless power transmission device and method for transmitting wireless power.
To this end, the present disclosure provides a wireless power transmission device, comprising: a communication circuit; a charging coil; and at least one processor electrically or operably connected to the communication circuit and the charging coil, wherein the at least one processor may be configured to control the charging coil to transmit wireless power to a wireless power receiving device, stop transmitting the wireless power based on a state of the wireless power receiving device, identify whether a period of time during which the transmission of the wireless power has been stopped exceeds a threshold period, and retransmit wireless power to the wireless power receiving device based on the period of time during which the transmission of the wireless power has been stopped exceeding the threshold period. Other embodiments may also be possible.

Description

{WIRELESS POWER TRANSMITTING DEVICE AND METHOD}

Various embodiments relate to a wireless power transmission device and method for transmitting wireless power.

As wireless charging technology has recently developed, research is being conducted on methods of supplying power to charge various electronic devices using a single charging device.

This wireless charging technology uses wireless power transmission and reception, and is a system that allows, for example, an electronic device to automatically charge its battery simply by placing it on a charging pad without having to connect it to a separate charging connector.

These wireless charging technologies are largely divided into the electromagnetic induction method using coils, the resonance method using resonance, and the radio wave radiation (RF/Micro Wave Radiation) method that converts electrical energy into microwaves and transmits it.

The method of transmitting power by wireless charging is a method of transmitting power between the first coil of the transmitter and the second coil of the receiver. A magnetic field is generated at the transmitter, and energy is generated by inducing or resonating current according to the change in the magnetic field at the receiver.

Recently, wireless charging technology using electromagnetic induction or magnetic resonance has been popularized, especially for electronic devices such as smartphones. When a power transmitting unit (PTU) (e.g., wireless charging pad, smartphone) and a power receiving unit (PRU) (e.g., watch, smartphone) come into contact or approach within a certain distance, the battery of the power receiving unit can be charged by electromagnetic induction or electromagnetic resonance between the transmitting coil of the power transmitting unit and the receiving coil of the power receiving unit.

During wireless charging between a wireless power transmitter and a wireless power receiver, a signal for controlling wireless charging may not be transmitted due to insufficient performance of the wireless power transmitter. For example, if the wireless power transmitter has poor performance in demodulating a signal transmitted by the wireless power receiver, even though the wireless power receiver transmits a signal to the wireless power transmitter for releasing a wireless power transmission interruption mode, the wireless power transmitter may not receive the signal. Accordingly, the wireless power transmitter remains in a state in which the wireless power transmission interruption mode is not released, and does not retransmit power to the wireless power receiver, so that the wireless power receiver may not be able to fully charge a battery due to not receiving wireless power.

Therefore, even if the performance of demodulating the signal transmitted from the wireless power receiving device is poor, there is a need to retransmit power to the wireless power receiving device so that the wireless power receiving device can fully charge the battery.

According to various embodiments, the wireless power transmitting device can fully charge the battery of the wireless power receiving device.

A wireless power transmission device according to various embodiments includes a communication circuit, a charging coil, and at least one processor electrically or operably connected to the communication circuit, and the communication circuit and the charging coil, wherein the at least one processor may be configured to control the charging coil to transmit wireless power to a wireless power receiving device, to stop transmission of the wireless power based on a state of the wireless power receiving device, to identify whether a period of time during which the transmission of the wireless power was stopped exceeds a threshold period, and to retransmit wireless power to the wireless power receiving device based on the period of time during which the transmission of the wireless power was stopped exceeding the threshold period.

According to various embodiments, a method of a wireless power transmitting device transmitting power may include transmitting wireless power to a wireless power receiving device, stopping transmission of the wireless power based on a state of the wireless power receiving device, identifying whether a period of time during which the wireless power transmission was stopped exceeds a threshold period, and retransmitting wireless power to the wireless power receiving device based on the period of time during which the wireless power transmission was stopped exceeding the threshold period.

According to various embodiments, a wireless power receiving device includes a communication circuit, a battery, a charging coil, and at least one processor electrically connected to the communication circuit, the battery, and the charging coil, wherein the at least one processor is configured to control the charging coil to receive wireless power from a wireless power transmitting device, charge the battery with the received wireless power, transmit a signal indicating a state of the wireless power receiving device to the wireless power transmitting device, and charge the battery with the wireless power retransmitted from the wireless power transmitting device after transmission of the wireless power is interrupted for a threshold period based on transmission of the signal.

While a wireless power transmitter transmits wireless power to a wireless power receiver, there may be a case where the wireless power transmitter operates in a power hold mode based on a state of the wireless power receiver, and thus wireless power is not provided to the wireless power receiver. In this case, even if a signal for releasing the power hold mode is not received from the wireless power receiver, when a predetermined period of time has passed, the wireless power transmitter retransmits wireless power to the wireless power receiver, thereby fully charging the battery of the wireless power receiver.

FIG. 1 is a block diagram of an electronic device within a network environment according to various embodiments.
FIG. 2 is a block diagram of a power management module and a battery according to various embodiments.
FIG. 3 is a basic conceptual diagram for wirelessly sharing power between a wireless power transmitter and a wireless power receiver according to various embodiments.
FIG. 4 is a conceptual diagram for explaining the concept of a charging circuit in a wireless power transmission device according to various embodiments.
FIG. 5 is a block diagram of a wireless power receiving device according to various embodiments.
FIG. 6 is an exemplary diagram showing a circuit diagram of a wireless charging IC of a wireless power receiving device according to various embodiments.
FIG. 7 is an exemplary diagram of a mounting structure of a wireless power transmission device according to various embodiments.
FIG. 8 is a flowchart illustrating operations of a wireless power transmitting device wirelessly transmitting power to a wireless power receiving device according to various embodiments.
FIG. 9 is a flowchart illustrating operations of a wireless power transmitting device wirelessly transmitting power to a wireless power receiving device according to various embodiments.
FIG. 10 is a flowchart illustrating operations of a wireless power receiving device wirelessly receiving power and charging according to various embodiments.
FIG. 11 is a flowchart showing the operation of wireless power transmission and reception between a wireless power transmitting device and a wireless power receiving device according to various embodiments.
FIG. 12 is a diagram showing changes in signal strength before and after receiving a wireless power hold release signal in a wireless power transmission device according to various embodiments.
FIG. 13a is an example diagram showing wireless charging when the wireless charging receiving device is a watch and the wireless charging transmitting device is a smartphone.
Figure 13b is an example diagram showing wireless charging when the wireless charging receiving device and the wireless charging transmitting device are smartphones.

FIG. 1 is a block diagram of an electronic device (101) within a network environment (100) according to various embodiments.

Referring to FIG. 1, in a network environment (100), an electronic device (101) may communicate with an electronic device (102) through a first network (198) (e.g., a short-range wireless communication network), or may communicate with an electronic device (104) or a server (108) through a second network (199) (e.g., a long-range wireless communication network). According to one embodiment, the electronic device (101) may communicate with the electronic device (104) through the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input device (150), an audio output device (155), a display device (160), an audio module (170), a sensor module (176), an interface (177), a haptic module (179), a camera module (180), a power management module (188), a battery (189), a communication module (190), a subscriber identification module (196), or an antenna module (197). In some embodiments, the electronic device (101) may omit at least one of these components (e.g., the display device (160) or the camera module (180)), or may include one or more other components. In some embodiments, some of these components may be implemented as a single integrated circuit. For example, a sensor module (176) (e.g., a fingerprint sensor, an iris sensor, or a light sensor) may be implemented embedded in a display device (160) (e.g., a display).

The processor (120) may control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) by executing, for example, software (e.g., a program (140)), and may perform various data processing or calculations. According to one embodiment, as at least a part of the data processing or calculations, the processor (120) may load a command or data received from another component (e.g., a sensor module (176) or a communication module (190)) into a volatile memory (132), process the command or data stored in the volatile memory (132), and store result data in a non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., a central processing unit or an application processor), and an auxiliary processor (123) (e.g., a graphic processing unit, an image signal processor, a sensor hub processor, or a communication processor) that may operate independently or together therewith. Additionally or alternatively, the auxiliary processor (123) may be configured to use less power than the main processor (121), or to be specialized for a given function. The auxiliary processor (123) may be implemented separately from the main processor (121), or as a part thereof.

The auxiliary processor (123) may control at least a portion of functions or states associated with at least one of the components of the electronic device (101) (e.g., the display device (160), the sensor module (176), or the communication module (190)), for example, on behalf of the main processor (121) while the main processor (121) is in an inactive (e.g., sleep) state, or together with the main processor (121) while the main processor (121) is in an active (e.g., application execution) state. According to one embodiment, the auxiliary processor (123) (e.g., an image signal processor or a communication processor) may be implemented as a part of another functionally related component (e.g., a camera module (180) or a communication module (190)).

The memory (130) can store various data used by at least one component (e.g., processor (120) or sensor module (176)) of the electronic device (101). The data can include, for example, software (e.g., program (140)) and input data or output data for commands related thereto. The memory (130) can include volatile memory (132) or nonvolatile memory (134).

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

The input device (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., processor (120)) from an external source (e.g., a user) of the electronic device (101). The input device (150) can include, for example, a microphone, a mouse, a keyboard, or a digital pen (e.g., a stylus pen).

The audio output device (155) can output an audio signal to the outside of the electronic device (101). The audio output device (155) can include, for example, a speaker or a receiver. The speaker can be used for general purposes such as multimedia playback or recording playback, and the receiver can be used to receive an incoming call. According to one embodiment, the receiver can be implemented separately from the speaker or as a part thereof.

The display device (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display device (160) can include, for example, a display, a holographic device, or a projector and a control circuit for controlling the device. According to one embodiment, the display device (160) can include touch circuitry configured to detect a touch, or a sensor circuitry configured to measure a strength of a force generated by the touch (e.g., a pressure sensor).

The audio module (170) can convert sound into an electric signal, or vice versa, convert an electric signal into sound. According to one embodiment, the audio module (170) can obtain sound through an input device (150), or output sound through an audio output device (155), or an external electronic device (e.g., an electronic device (102)) (e.g., a speaker or a headphone) directly or wirelessly connected to the electronic device (101).

The sensor module (176) can detect an operating state (e.g., power or temperature) of the electronic device (101) or an external environmental state (e.g., user state) and generate an electric signal or data value corresponding to the detected state. According to one embodiment, the sensor module (176) can include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

The interface (177) may support one or more designated protocols that may be used to directly or wirelessly connect the electronic device (101) with an external electronic device (e.g., the electronic device (102)). In one embodiment, the interface (177) may include, for example, a high definition multimedia interface (HDMI), a universal serial bus (USB) interface, an SD card interface, or an audio interface.

The connection terminal (178) may include a connector through which the electronic device (101) may be physically connected to an external electronic device (e.g., the electronic device (102)). According to one embodiment, the connection terminal (178) may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (e.g., a headphone connector).

The haptic module (179) can convert an electrical signal into a mechanical stimulus (e.g., vibration or movement) or an electrical stimulus that a user can perceive through a tactile or kinesthetic sense. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

The camera module (180) can capture still images and moving images. According to one embodiment, the camera module (180) can include one or more lenses, image sensors, image signal processors, or flashes.

The power management module (188) can manage power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented as, for example, at least a part of a power management integrated circuit (PMIC).

The battery (189) can power at least one component of the electronic device (101). In one embodiment, the battery (189) can include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

The communication module (190) may support establishment of a direct (e.g., wired) communication channel or a wireless communication channel between the electronic device (101) and an external electronic device (e.g., the electronic device (102), the electronic device (104), or the server (108)), and performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., the application processor) and may include one or more communication processors that support direct (e.g., wired) communication or wireless communication. According to one embodiment, the communication module (190) may include a wireless communication module (192) (e.g., a cellular communication module, a short-range wireless communication module, or a GNSS (global navigation satellite system) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module or a power line communication module). Any of these communication modules may communicate with an external electronic device via a first network (198) (e.g., a short-range communication network such as Bluetooth, WiFi direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a cellular network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules may be integrated into a single component (e.g., a single chip) or implemented as multiple separate components (e.g., multiple chips). The wireless communication module (192) may use subscriber information stored in the subscriber identification module (196) (e.g., an international mobile subscriber identity (IMSI)) to identify and authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199).

The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). According to one embodiment, the antenna module can include one antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). According to one embodiment, the antenna module (197) can include a plurality of antennas. In this case, at least one antenna suitable for a communication method used in a communication network, such as the first network (198) or the second network (199), can be selected from the plurality of antennas by, for example, the communication module (190). A signal or power can be transmitted or received between the communication module (190) and the external electronic device via the selected at least one antenna. According to some embodiments, in addition to the radiator, another component (e.g., an RFIC) can be additionally formed as a part of the antenna module (197).

At least some of the above components may be connected to each other and exchange signals (e.g., commands or data) with each other via a communication method between peripheral devices (e.g., a bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)).

According to one embodiment, a command or data may be transmitted or received between the electronic device (101) and an external electronic device (104) via a server (108) connected to a second network (199). Each of the electronic devices (102, 104) may be the same or a different type of device as the electronic device (101). According to one embodiment, all or part of the operations executed in the electronic device (101) may be executed in one or more of the external electronic devices (102, 104, or 108). For example, when the electronic device (101) is to perform a certain function or service automatically or in response to a request from a user or another device, the electronic device (101) may, instead of executing the function or service by itself or in addition, request one or more external electronic devices to perform at least a part of the function or service. One or more external electronic devices that have received the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit the result of the execution to the electronic device (101). The electronic device (101) may process the result as is or additionally and provide it as at least a part of a response to the request. For this purpose, for example, cloud computing, distributed computing, or client-server computing technology may be used.

FIG. 2 is a block diagram (200) of a power management module (188) and a battery (189) according to various embodiments.

Referring to FIG. 2, the power management module (188) may include a charging circuit (210), a power regulator (220), or a power gauge (230). The charging circuit (210) may charge the battery (189) using power supplied from an external power source for the electronic device (101). According to one embodiment, the charging circuit (210) may select a charging method (e.g., normal charging or rapid charging) based on at least some of the type of the external power source (e.g., power adapter, USB, or wireless charging), the amount of power that can be supplied from the external power source (e.g., about 20 watts or more), or the properties of the battery (189), and may charge the battery (189) using the selected charging method. The external power source may be connected to the electronic device (101) by a wire, for example, through a connection terminal (178), or may be connected wirelessly through an antenna module (197).

The power regulator (220) can generate a plurality of powers having different voltages or different current levels by adjusting, for example, the voltage level or current level of the power supplied from the external power source or the battery (189). The power regulator (220) can adjust the power of the external power source or the battery (189) to a voltage or current level suitable for each of the components included in the electronic device (101). According to one embodiment, the power regulator (220) can be implemented in the form of an LDO (low drop out) regulator or a switching regulator. The power gauge (230) can measure usage status information for the battery (189) (e.g., capacity, number of charge/discharge cycles, voltage, or temperature of the battery (189).

The power management module (188) can determine charging state information (e.g., life, overvoltage, undervoltage, overcurrent, overcharge, over discharge, overheat, short circuit, or swelling) related to charging of the battery (189) based at least in part on the measured usage state information, for example, by using the charging circuit (210), the voltage regulator (220), or the power gauge (230). The power management module (188) can determine whether the battery (189) is normal or abnormal based at least in part on the determined charging state information. If the state of the battery (189) is determined to be abnormal, the power management module (188) can adjust charging for the battery (189) (e.g., reducing the charging current or voltage, or stopping charging). According to one embodiment, at least some of the functions of the power management module (188) can be performed by an external control device (e.g., the processor (120)).

The battery (189) may, according to one embodiment, include a battery protection circuit module (PCM) (240). The battery protection circuit (240) may perform one or more of various functions (e.g., a pre-cut function) to prevent performance degradation or damage to the battery (189). The battery protection circuit (240) may additionally or alternatively be configured as at least a part of a battery management system (BMS) that may perform various functions including cell balancing, capacity measurement of the battery, charge/discharge cycle measurement, temperature measurement, or voltage measurement.

According to one embodiment, at least a part of the usage status information or the charging status information of the battery (189) may be measured using a corresponding sensor (e.g., a temperature sensor) among the sensor modules (276), a power gauge (230), or a power management module (188). According to one embodiment, the corresponding sensor (e.g., a temperature sensor) among the sensor modules (176) may be included as a part of the battery protection circuit (140), or may be placed near the battery (189) as a separate device.

Electronic devices according to various embodiments disclosed in this document may be devices of various forms. The 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 appliance devices. Electronic devices according to embodiments of this document are not limited to the above-described devices.

The various embodiments of this document and the terminology used herein are not intended to limit the technical features described in this document to specific embodiments, but should be understood to include various modifications, equivalents, or substitutes of the embodiments. In connection with the description of the drawings, similar reference numerals may be used for similar or related components. The singular form of a noun corresponding to an item may include one or more of the items, unless the context clearly indicates otherwise. In this document, each of the phrases "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" can include any one of the items listed together in the corresponding phrase, or all possible combinations thereof. Terms such as "first", "second", or "first" or "second" may be used merely to distinguish one component from another, and do not limit the components in any other respect (e.g., importance or order). When a component (e.g., a first) is referred to as "coupled" or "connected" to another (e.g., a second) component, with or without the terms "functionally" or "communicatively," it means that the component can be connected to the other component directly (e.g., wired), wirelessly, or through a third component.

The term "module" as used in this document may include a unit implemented in hardware, software or firmware, and may be used interchangeably with terms such as logic, logic block, component, or circuit. A module may be an integrally configured component or a minimum unit of the component or a part thereof that performs one or more functions. For example, according to one embodiment, a module may be implemented in the form of an application-specific integrated circuit (ASIC).

Various embodiments of the present document may be implemented as software (e.g., a program (140)) including one or more commands stored in a storage medium (e.g., an internal memory (136) or an external memory (138)) readable by a machine (e.g., an electronic device (101)). For example, a processor (e.g., a processor (120)) of the machine (e.g., an electronic device (101)) may call at least one command among the one or more commands stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the called at least one command. The one or more commands may include code generated by a compiler or code executable by an interpreter. The machine-readable storage medium may be provided in the form of a non-transitory storage medium. Here, ‘non-transitory’ simply means that the storage medium is a tangible device and does not contain signals (e.g. electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently or temporarily on the storage medium.

According to one embodiment, the method according to the various embodiments disclosed in the present document may be provided as included in a computer program product. The computer program product may be traded between a seller and a buyer as a commodity. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., a compact disc read only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) via an application store (e.g., Play Store ^TM ) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a part of the computer program product may be at least temporarily stored or temporarily generated in a machine-readable storage medium, such as a memory of a manufacturer's server, a server of an application store, or an intermediary server.

According to various embodiments, each component (e.g., a module or a program) of the above-described components may include a single or multiple entities. According to various embodiments, one or more of the components or operations of the above-described components may be omitted, or one or more other components or operations may be added. Alternatively or additionally, a plurality of components (e.g., a module or a program) may be integrated into a single component. In such a case, the integrated component may perform one or more functions of each of the components of the plurality of components identically or similarly to those performed by the corresponding component of the plurality of components prior to the integration. According to various embodiments, the operations performed by the module, program or other component may be executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations may be executed in a different order, omitted, or one or more other operations may be added.

FIG. 3 is a basic conceptual diagram for wirelessly sharing power between a wireless power transmitter and a wireless power receiver according to various embodiments.

Referring to FIG. 3, the wireless power transmitter (101) and the wireless power receiver (301) are both capable of wireless power transmission/reception and can transmit and receive power, or one of the two devices may be an electronic device capable of only wireless power reception. For example, if either the wireless power transmitter (101) or the wireless power receiver (301) is a wearable device or an existing electronic device, it can be considered that only wireless power reception is possible. In this document, the description is based on the wireless power transmitter (101), but the wireless power receiver (301) may have the same configuration as the wireless power transmitter (101) or may be a device from which only the wireless power transmission function is removed. The wireless power transmitter (101) and the wireless power receiver (301) may each be supplied with power through a USB (302, 303) terminal.

The wireless power transmission device (101) may include a power transmission circuit (310) and an external connection terminal (e.g., USB, TA) (330). The power transmission circuit (310) may include a coil (e.g., charging coil) (314), a wireless charging IC (313), a PMIC (power management IC) (312), a battery (189), and a processor (311).

The above battery (189) can supply power from the PMIC (312). The above battery (189) may be a built-in battery that cannot be separated from the wireless power transmitter (101), or may be a detachable battery that can be separated or replaced.

The above coil (314) may be configured as a spiral-shaped conductive pattern on a flexible printed circuit board (FPCB). The coil (314) may transmit a power signal from a wireless power transmission device (101). For example, when a wireless power reception device (301) is placed on a wireless power transmission device (101), current flows through the coil (314).

The above PMIC (312) may include a charger function that charges wired and wireless input power into a battery (189), a function for communicating with an external power device (USB (universal serial bus) and an external power device (Travel adapter, etc.) through an external connection terminal (330) (USB battery charging spec. USB Power Delivery communication, AFC communication, Quick Charge communication, etc.), a function for supplying power required by the system and supplying power appropriate for the voltage level required by each element, and a function for supplying power to a wireless charging IC (313) in a wireless power transmission mode. The function for communicating with an external power device (USB battery charging spec. USB Power Delivery communication, AFC communication, Quick Charge communication, etc.) through the external connection terminal (330) may be performed by another component separated from the PMIC (312). The above system means a system that supplies power to each module or component of the wireless power transmission device (101). The above PMIC (312) can convert the voltage (e.g., 3 V to 5 V) output from the battery (189) into rectified power and transmit it to the wireless power receiving device (301) through the wireless charging IC (313) and coil (314).

The wireless charging IC (313) may include a full bridge circuit. The wireless charging IC (313) may control the full bridge circuit to be driven by an inverter (DC → AC) in a wireless power transmission operation, and may control the full bridge circuit to be driven by a rectifier (AC → DC) in a wireless power reception operation. The wireless charging IC (313) may exchange signals required for wireless power transmission through in-band communication with a counterpart electronic device (e.g., a wireless power receiving device (301)) according to the WPC (wireless power consortium) standard. The in-band communication is a method in which data can be exchanged between the coil (314) of the wireless power transmitting device (101) and the coil (324) of the wireless power receiving device (301) through frequency or amplitude modulation of a wireless power transmission signal during wireless power transmission.

The above external connection terminal (330) is a terminal that follows the USB standard and can provide interfaces such as USB charging and OTG (on-the-go) power supply.

The processor (311) can comprehensively control functions such as wired/wireless charging, USB communication with external electronic devices, and communication with external power devices (USB PD, BC1.2, AFC, QC, etc.) according to the status of the wireless power transmission device (101). The processor (311) can determine whether the wireless power reception device (301) is in proximity. For example, the processor (311) can identify whether the coil (314) of the wireless power transmission device (101) and the coil (324) of the wireless power reception device (301) are positioned to correspond to each other. The processor (311) can determine whether the wireless power reception device (301) is in proximity through an in-band communication method. The in-band communication method is a method in which the wireless power transmission device (101) and the wireless power reception device (301) can communicate at the same frequency as the frequency used for wireless power transmission. For example, the above-mentioned in-band communication method exchanges information through a wireless communication module (192), and in the magnetic induction method, the proximity of two coils can be detected (selected) through a change in the current induced in the coil, and ping signal identification and configuration-power transfer operations can be performed.

The wireless power transmitter (101) can perform communication (e.g., data communication) with the wireless power receiver (301) in an in-band communication manner using electromagnetic waves generated by the coil (314). The wireless power transmitter (101) can transmit at least one signal for controlling power transmission to the wireless power receiver (301) based on the in-band communication manner with the wireless power receiver (301), or can receive at least one signal indicating the status of the wireless power receiver (301) from the wireless power receiver (301). The signal may include at least one of charging setting information related to the state of the battery (189) of the wireless power receiving device (301), power amount control information related to adjusting the amount of power transmitted to the wireless power receiving device (301), environmental information related to the charging environment of the wireless power receiving device (301), information indicating the start of wireless power transmission, information indicating the stop of wireless power transmission, information about the period during which the wireless power transmission will be stopped, information indicating the release of the stop of wireless power transmission, or time information of the wireless power receiving device (301). The wireless power may be transmitted to the coil (324) of the wireless power receiving device (301) through the coil (314) via the PMIC (312) and the wireless charging IC (313).

The above charging setting information may include information related to the state of the battery (325) of the wireless power receiving device (301) at the time of wireless charging between the wireless power transmitting device (101) and the wireless power receiving device (301). For example, the charging setting information may include at least one of the total capacity of the battery (325) of the wireless power receiving device (301), the remaining amount of the battery (325), the number of charging cycles, the usage amount of the battery (325), the charging mode, the charging method, or the wireless reception frequency band. The power amount control information may include information for controlling the amount of initial power transmitted according to a change in the amount of power charged to the wireless power receiving device (301) during wireless charging between the wireless power transmitting device (101) and the wireless power receiving device (301). The above environmental information is information measuring the charging environment of the wireless power receiving device (301), and may include, for example, at least one of temperature data including at least one of the internal temperature or external temperature of the wireless power receiving device (301), illuminance data indicating illuminance (brightness) around the wireless power receiving device (301), or sound data indicating sound (noise) around the wireless power receiving device (301). The information about the period during which the wireless power transmission is to be interrupted is information about the period during which the wireless power transmission is to be interrupted can be identified through a timer operated by the wireless power transmitting device (101). The wireless power transmitting device (101) can identify the period during which the wireless power transmission is to be interrupted through the timer.

According to one embodiment, the wireless charging receiving device (301) can transmit at least one of its PRMC (power receiver manufacturer codes) or unique identifiers to the wireless charging transmitting device (101). The wireless charging transmitting device (101) can adjust the period setting of the timer for the power hold mode using at least one of the PRMC or the unique identifier received from the wireless charging receiving device (301). For example, if the wireless charging receiving device (301) is recognized as a wearable device, the period can be set to 1 minute, and if the wireless charging receiving device (301) is recognized as a watch, the period can be set to 2 minutes. The set period (e.g., 1 minute or 2 minutes) is adjustable.

According to one embodiment, a demodulation circuit capable of demodulating a control signal received from the wireless power receiving device (301) may be included in the wireless charging IC (313) of the wireless power transmitting device (101). The wireless charging IC (313) (e.g., demodulation circuit) may demodulate a control signal received from the wireless power receiving device (301) and transmit it to the processor (311).

According to various embodiments, the wireless power transmitter (101) may operate in a power transmission mode that transmits wireless power using power from a battery (189), and when an external power source is connected, the external power source may be used in the power transmission mode and the remaining power may be charged to the battery (189). Each of the wireless power transmitter (101) and the wireless power receiver (301) may correspond to the electronic device (101) illustrated in FIG. 1. The wireless power transmitter (101) and the wireless power receiver (301) may wirelessly transmit and receive power using an in-band communication method.

According to one embodiment, the wireless power receiving device (301) may include a power receiving circuit (320) and an external connection terminal (e.g., USB, TA) (340). The power receiving circuit (320) may include a coil (e.g., charging coil) (324), a wireless charging IC (323), a PMIC (power management IC) (322), a battery (325), and a processor (321). The coil (324) may receive a power signal from the coil (314) of the wireless power transmitting device (101) and provide it to the wireless charging IC (323). The wireless charging IC (323) may convert the power signal obtained through the coil (314) into electric energy and provide the converted electric energy to the PMIC (322). The PMIC (322) may receive wireless power from the wireless power transmitting device (101) and charge the battery (325). The PMIC (130) monitors the current and voltage values supplied to the battery (325), and when the battery (325) is fully charged, it can provide information that the battery (325) is fully charged to the processor (321). Here, being fully charged may include a case where it is physically fully charged, and a case where it is charged to a certain level (e.g., 99.5%) or more compared to the total battery capacity and can be considered substantially fully charged. The battery (325) can receive power from the PMIC (322). The battery (325) may be a built-in battery that cannot be separated from the wireless power receiving device (301), or may be a detachable battery that can be separated or replaced.

The wireless charging IC (323) may further include a ping detector for detecting a ping signal transmitted from the wireless power transmitter (101), and the ping detector is described in detail with reference to FIGS. 5 and 6. Each component of the wireless power receiver (301) may correspond to each component of the wireless power transmitter (101). The wireless power receiver (301) may receive power by using electromotive force formed in the coil (314) of the wireless power transmitter (101) and the coil (324) of the wireless power receiver (301). Each of the coils (314, 324) may include at least one conductive pattern.

FIG. 4 is a conceptual diagram for explaining the concept of a charging circuit in a wireless power transmission device according to various embodiments.

Referring to FIG. 4, a wireless power transmission device (101) according to various embodiments may include a battery (189), a wired interface (421), a wireless interface (425), and a charging circuit (210).

The above battery (189) may be mounted within the housing of the wireless power transmitter (101) and may be rechargeable. The battery (189) may include, for example, a rechargeable battery and/or a solar battery.

The above-described wired interface (421) and the above-described wireless interface (425) may be mounted on a part of the housing of the wireless power transmission device (101), and may be respectively connectable to an external device. The above-described wired interface (421) may be provided with a connector (421-1) such as a USB (universal serial bus), and may be wired-connected to a first external electronic device (401) (e.g., the electronic device (102) of FIG. 1) through the connector (421-1). The above-described wireless interface (425) may be provided with a coil (314) (also referred to as a 'conductive pattern') and a wireless charging IC (313). The above-described wireless charging IC (313) may include a TX IC (transmit integrated chip) capable of wirelessly transmitting power, and an RX IC (receive integrated chip) capable of wirelessly receiving power. The wireless power transmission device (101) can wirelessly transmit or receive power to or from a second external electronic device (402) through the coil (314) and the wireless charging IC (313). According to one embodiment, the wireless power transmission device (101) can simultaneously transmit and receive wireless power to or from a second external electronic device (402) through the coil (314) and the wireless charging IC (313). The wireless power can be transmitted and received using a magnetic inductive coupling method. According to one embodiment, the coil (314) can include a first coil for transmitting wireless power and a second coil for receiving wireless power.

The first external electronic device (401) is an external electronic device that can be connected in a wired manner, and may be a wired power supply device, a wired power reception device, or an OTG (On The Go) device. The OTG device may be a device that performs an OTG function by being connected to other electronic devices, such as a personal digital assistant, an MP3 player, a mobile phone, a mouse, a keyboard, a USB memory, and a healthcare accessory, to exchange data. The wired power supply device may be a device that is connected in a wired manner and supplies power to the electronic device, such as a TA (travel adapter). The wired power reception device may be a device that is connected in a wired manner and can receive power from the electronic device and charge another battery provided in the wired power reception device. According to one embodiment, the first external electronic device (401) connected to the wireless power transmission device (101) through the wired interface (421) may include a wired HV (high voltage) device (for example, a device that supports AFC (adaptive fast charge)). When the above wired HV device is connected to the connector (421-1), power of a higher voltage (e.g., 9v, 12v, 20v, etc.) than the voltage supplied from the battery (189) (e.g., 5v) can be supplied to or received by the wired HV device.

The charging circuit (210) may be electrically connected to the battery (189), and may be configured to electrically connect between the battery (189) and the wired interface (421), and between the battery (410) and the wireless interface (425), respectively. The charging circuit (210) may be electrically connected to the battery (189) and the coil (314), and may be configured to wirelessly transmit power to a second external electronic device (402) (e.g., a wireless power receiving device (301)), and may be configured to wirelessly transmit power to the outside while electrically connecting the battery (189) and a connector to transmit power to a first external electronic device (401) (e.g., a wired power receiving device) by wire. For example, the charging circuit (210) can change the first power generated by the battery (189) into a second power higher than the first power and transmit at least a portion of the second power, which is a third power, to a second external electronic device (402) (e.g., a wireless power receiving device (301)) through the coil (314), and transmit at least another portion of the second power, which is a fourth power, to an OTG device or a wired power receiving device through the connector.

According to one embodiment, the charging circuit (210) may include an interface controller (429), a first switch (431), a second switch (432), a processor (311), a switch group (433), and a charging switch (434).

The above interface controller (429) can determine the type of the first external electronic device (401) connected to the wired interface (421), and can determine whether fast charging is supported through digital (USB power delivery, Quick charge ^TM , adaptive fast charge, etc.) communication with the first external electronic device (401). According to one embodiment, the interface controller (429) may include a MUIC (micro USB interface IC) or an AFC (adaptive fast charge), USB PD (power delivery) interface. For example, the MUIC can determine whether the first external electronic device (401) connected to the wired interface (421) is a wired power supply device, a wired power reception device, or an OTG device according to the USB battery charging spec.

The first switch (431) may include at least one switch, and may control power output to an electronic device, such as an OTG device or a wired power receiving device, and power input from a wired power supply device, which is connected via a wired interface (421), for example, a connector (421-1). For example, the first switch (431) may be operated in an on state to enable power output to the OTG device or the wired power receiving device and power input from the wired power supply device, or may be operated in an off state to prevent power transmission to the OTG device or the wired power receiving device and power input from the wired power supply device.

The second switch (432) may include at least one switch, and may control power transmission and/or reception from the wireless power transmitter (101) and the wireless power receiver (301), etc., through the wireless interface (425), for example, the coil (314) and the wireless charging IC (313). For example, the second switch (432) may be operated in an on state to enable power transmission and reception from the wireless power transmitter or the wireless power receiver, or may be operated in an off state to prevent power transmission and reception from the wireless power transmitter or the wireless power receiver.

At least one of the first switch (431) or the second switch (432) can be operated to cut off power when power exceeding the allowable voltage/current flows.

The processor (311) can control to convert power input from at least one of the first switch (431) and the second switch (432) into a charging voltage and a charging current suitable for charging the battery (189), can control to convert power from the battery (189) into a charging voltage and a charging current suitable for charging another battery of an external device connected to each of the first switch (431) and the second switch (432), and can control to convert power from the battery (189) into a voltage and a current suitable for use in an external electronic device. The processor (311) can perform a Charging Current Sensing function, a Charging Cut off function, a CC loop (constant current loop) function, a CV loop (constant voltage loop) function, a Termination Current loop function, a Recharging loop function, and a Battery to System FET Loop function. The Charging Current Sensing function can be a function for detecting the amount of charging current. The Charging Cut off function can be a function for stopping charging of the battery (189) in the event of overcharging or overheating. The CC loop function may be a function that controls a CC (constant current) section in which the charging current is maintained constant. The CV loop function may be a function that controls a CV (constant voltage) section in which the charging voltage is maintained constant. The termination current loop function may be a function that controls the termination of charging. The recharging loop function may be a function that controls recharge. The battery to system FET loop function may be a function that controls the voltage and current between the battery (189) and the system.

According to one embodiment, the processor (311) may control the charging circuit (210) to selectively transmit power from the battery (189) to the outside, either wirelessly or wiredly. In addition, the processor (311) may control the charging circuit (210) to transmit power to the first external electronic device (401) and/or the second external electronic device (402), or to receive power from the first external electronic device (401) and/or the second external electronic device (402).

The above switch group (433) may provide a constant current to the system (420) (e.g., a system that supplies power to each module of the wireless power transmitter (101)), boost (↑) or buck (↓) the voltage of the battery (189) to provide a constant current to a connected external electronic device, or boost (↑) or buck (↓) the charging voltage provided to provide a constant charging current to the battery (189). According to one embodiment, the switch group (433) may include a Buck/Boost converter.

The above charging switch (434) can detect the charging current amount and block charging of the battery (189) in case of overcharging or overheating.

According to one embodiment, the wireless power transmission device (101) can display a user interface configured to control at least a part of the charging circuit (210) on the display device (160). The display device (160) can receive a user input for transmitting power from the battery (189) to an external device wirelessly or by wire. The display device (160) can display at least one external electronic device connected to the wireless power transmission device (101), can display a battery remaining amount of the connected external device, or can display whether power is being supplied to the connected external device or power is being received from the connected external device. According to one embodiment, the display device (160) can display various information that requires a user input for transmitting and receiving power between the wireless power transmission device (101) and the wireless power reception device (301), and can display information corresponding thereto when an error or obstacle occurs in the transmission and reception of the power.

FIG. 5 is a block diagram of a wireless power receiving device according to various embodiments, and FIG. 6 is an exemplary diagram showing a circuit diagram of a wireless charging IC of a wireless power receiving device according to various embodiments.

Referring to FIGS. 5 and 6, each of the PMIC (322), the wireless charging IC (323), the battery (325), and the processor (321) of the wireless power receiving device (301) may correspond to each of the PMIC (322), the wireless charging IC (323), the battery (325), and the processor (321) of the wireless power receiving device (301) in FIG. 3. According to one embodiment, when the wireless power receiving device (301) is a wearable device, it may include at least one component included in FIG. 1. According to one embodiment, the wireless charging IC (313) of the wireless power transmitting device (101) may correspond to the wireless charging IC (313) of FIG. 3.

The wireless power receiving device (301) may include a ping detector (510). The ping detector (510) may be included in the wireless charging IC (323).

The ping detector (510) can detect at least one ping signal transmitted from the wireless power transmitter (101) when the wireless power transmitter (101) stops transmitting wireless power (e.g., when the wireless power transmitter (101) enters a power hold mode (PHM)). The ping signal can perform a function for determining whether the wireless power receiver (301) is present on one side (e.g., the rear or the front) of the wireless power transmitter (101). In the power hold mode, the wireless power transmitter (101) can be switched to a standby state and transmit a ping signal to the wireless power receiver (301) at regular intervals, and the wireless power receiver (301) can be switched to a wireless charging IC (e.g., RX IC) (323) to a disabled state. According to one embodiment, the wireless power receiving device (301) may enable the ping detector (510) in the power hold mode and switch the remaining portion of the wireless charging IC (e.g., RX IC) (323) excluding the ping detector (510) to a disabled state. When a ping signal of 5 V is received, the ping detector (510) of the wireless power receiving device (301) switches the MO switch (601) to ON, and the processor (321) may identify that the ping signal has been received according to a change in a pull-up signal resulting from the switching. In the power hold mode, even though the wireless power receiving device (301) is positioned on one surface of the wireless power transmitting device (101), the wireless power transmitting device (101) may not transmit power, and may only transmit a certain signal to detect the presence of the wireless power receiving device (301) and to restart wireless charging. Accordingly, the wireless power receiving device (301) can recognize the ping signal of the wireless power transmitting device (101) through the ping detector (510) rather than the wireless charging IC (e.g., Rx IC) (323). Through this, the wireless power transmitting device (101) can determine whether the wireless power receiving device (301) is located on one side of the wireless power transmitting device (101) and display the charging control and user interface accordingly on the display device (160). The wireless power receiving device (301) can determine whether the power hold mode is maintained through the ping detector (510). For example, when the wireless power receiving device (301) wants to terminate the power hold mode, the wireless power receiving device (301) can enable the wireless charging IC (e.g., Rx IC) (323) and transmit a signal to terminate the power hold mode to the wireless power transmitting device (101). The wireless power transmission device (101) that receives the above signal can wirelessly transfer power to the wireless power reception device (301) through a normal power transmission process. The wireless power reception device (301) can detect the ping signal transmitted from the wireless power transmission device (101), thereby confirming whether there is contact with the wireless power transmission device (101) during the power hold mode operation, and transmit the signal.

FIG. 7 is an exemplary diagram of a mounting structure of a wireless power transmission device according to various embodiments.

According to various embodiments, the wireless power transmitter (101) may include a back plate (704), a protective film (701) disposed under the back plate (704), a coil (314) disposed under the protective film (701), a magnetic field shielding layer (702) disposed under the coil (314), and an adhesive (703) disposed under the magnetic field shielding layer (702).

The coil (314) of the wireless power transmitter (101) may be configured in a spiral pattern in the form of a flexible printed circuit board (FPCB) and may be placed on the rear surface. A magnetic field shielding layer (shielding sheet and graphite sheet) (702) may be formed on one surface of the coil (314). The magnetic field shielding layer (702) concentrates the direction of the magnetic field toward the rear surface of the wireless power transmitter (101) and suppresses the formation of a magnetic field inside the wireless power transmitter (101), thereby preventing abnormal operation of other components inside the wireless power transmitter (101).

According to various embodiments, a wireless power transmission device (101) includes a communication circuit (e.g., a wireless charging IC (313)), a charging coil (e.g., a coil (314)), and at least one processor (311) electrically connected to the communication circuit (e.g., the wireless charging IC (313)) and the charging coil (e.g., the coil (311)), wherein the at least one processor (311) may be configured to control the charging coil (314) to transmit wireless power to a wireless power reception device (301), stop transmission of the wireless power based on a state of the wireless power reception device, identify whether a period of time during which the transmission of the wireless power has been stopped exceeds a threshold period, and retransmit wireless power to the wireless power reception device (301) based on the period of time during which the transmission of the wireless power has been stopped exceeding the threshold period.

According to one embodiment, the at least one processor (311) is configured to receive a signal for stopping transmission of the wireless power from the wireless power receiving device (301), and to stop transmission of the wireless power to the wireless power receiving device (301) based on the received signal, wherein the signal for stopping transmission of the wireless power may include at least one of information on a temperature generated in the wireless power receiving device (301) or information on a period during which transmission of the wireless power is to be stopped.

According to one embodiment, the at least one processor (311) may be configured to drive a timer when the transmission of the wireless power is interrupted, identify the period during which the transmission of the wireless power is interrupted based on the driven timer, and compare the identified period with the threshold period.

According to one embodiment, the at least one processor (311) may be configured to identify a temperature generated in the wireless power receiving device (301) if the period of suspension of the transmission of the wireless power exceeds the threshold period, and if the identified temperature exceeds the threshold temperature, maintain the suspension of the transmission of the wireless power, and if the identified temperature does not exceed the threshold temperature, release the suspension of the transmission of the wireless power and retransmit the wireless power to the wireless power receiving device.

According to one embodiment, the period during which the wireless power transmission is to be interrupted is set in the wireless power receiving device, and may be set differently depending on the type of the wireless power receiving device.

According to one embodiment, the at least one processor (311) may be configured to identify whether a signal for releasing the wireless power interruption is received from the wireless power receiving device (301) through the communication circuit (e.g., wireless charging IC (313)), demodulate the received signal to release the wireless power interruption, and retransmit the wireless power to the wireless power receiving device (301).

According to one embodiment, the at least one processor (311) may be configured to identify a temperature generated in the wireless power receiving device (301) after releasing the wireless power interruption, and if the identified temperature exceeds a threshold temperature, maintain the interruption of the transmission of the wireless power, and if the identified temperature does not exceed the threshold temperature, release the interruption of the transmission of the wireless power and retransmit the wireless power to the wireless power receiving device (301).

According to one embodiment, the at least one processor (311) may be configured to release the suspension of the transmission of the wireless power and retransmit the wireless power to the wireless power receiving device (301) when a signal for releasing the suspension of the wireless power is received from the wireless power receiving device (301) while the period of the suspension of the transmission of the wireless power does not exceed the threshold period.

According to one embodiment, the at least one processor (311) may be configured to, when the signal for releasing the interruption of the wireless power is received from the wireless power receiving device (301), identify whether a temperature generated in the wireless power receiving device (301) exceeds a threshold temperature, and, if the temperature generated in the wireless power receiving device (301) exceeds the threshold temperature, maintain the interruption of the transmission of the wireless power, and, if the temperature generated in the wireless power receiving device (301) does not exceed the threshold temperature, release the interruption of the transmission of the wireless power and retransmit the wireless power to the wireless power receiving device (301).

According to one embodiment, the signal for releasing the wireless power interruption may be received from the wireless power receiving device (301) in an in-band manner based on a ping signal transmitted to the wireless power receiving device (301).

According to various embodiments, a wireless power receiving device (301) includes a communication circuit (e.g., a wireless charging IC (323)), a battery (325), a charging coil (e.g., a coil (324)), and at least one processor (321) electrically connected to the communication circuit (e.g., the wireless charging IC (323)), the battery (325), and the charging coil (e.g., the coil (324)), wherein the at least one processor (321) controls the charging coil to receive wireless power from a wireless power transmitting device (101), so as to charge the battery with the received wireless power, transmit a signal indicating a status of the wireless power receiving device to the wireless power transmitting device, and, based on transmission of the signal, charge the battery with the wireless power retransmitted from the wireless power transmitting device after transmission of the wireless power is interrupted for a threshold period of time.

FIG. 8 is a flowchart illustrating operations of a wireless power transmitting device wirelessly transmitting power to a wireless power receiving device according to various embodiments.

The wireless power transmission device (101) and the wireless power reception device (301) may be referred to as a wireless power transmission device (101) depending on whether they transmit power, and may be referred to as a wireless power reception device (301) depending on whether they receive power. According to one embodiment, the wireless power transmission device (101) may be a wireless power reception device (301), and the wireless power reception device (301) may be a wireless power transmission device (101). Each of the wireless power transmission device (101) and the wireless power reception device (301) may include each of the components disclosed in FIGS. 1 to 5, and may perform operations performed by each of the components disclosed in FIGS. 1 to 5. In one embodiment, at least one of operations 802 to 822 may be omitted, some of the operations may be performed simultaneously and in parallel, the order of some of the operations may be changed, or other operations may be added.

In operation 802, according to one embodiment, the wireless power transmitter (101) may transmit a wireless power signal (e.g., a ping signal) to the wireless power receiver (301) for searching for the wireless power receiver (301), which is a device receiving power. The wireless power transmitter (101) may transmit a signal for searching for the wireless power receiver (301). When power is applied to the wireless power transmitter (101), the wireless power transmitter (101) may configure an environment and enter a basic mode (or state) for inductive charging. For example, the wireless power transmitter (101) may periodically apply a power beacon in the basic mode for inductive charging. For example, the wireless power signal may include power for activating the wireless power receiver (301) or at least one component included in the wireless power receiver (301). The wireless power signal may be, for example, a signal generated by applying a power signal of a selected operating point for a selected time period. The operating point may be defined by the frequency, duty cycle, or amplitude of the voltage applied to the power transmission circuit (310).

According to one embodiment, the wireless power transmitter (101) can detect a change in at least one of the frequency, current, or voltage of the wireless charging IC (313), thereby identifying the wireless power receiver (301). For example, when transmitting power according to an inductive coupling method, the wireless power transmitter (101) can detect a position of the wireless power receiver (301) placed on one surface (e.g., the rear or front) of the wireless power transmitter (101). For example, the wireless power transmitter (101) can detect the position of the wireless power receiver (301) by applying current to the wireless charging IC (313) and measuring the impedance of the coil (314) (e.g., a conductive pattern).

In operation 804, according to one embodiment, the wireless power receiving device (301) may transmit a response signal to the wireless power signal (e.g., a ping signal) to the wireless power transmitting device (101). For example, the wireless power receiving device (301) may transmit the strength of the power signal received or the power transmission termination signal in response to the search signal to the wireless power transmitting device (101). The strength of the power signal may indicate the degree of inductive coupling for power transmission between the wireless power transmitting device (101) and the wireless power receiving device (301). For example, when the power received by the wireless power receiving device (301) is lower than the power transmitted by the wireless power transmitting device (101), the wireless power receiving device (301) may determine that the degree of coupling is low. The wireless power transmission device (101) may determine that it has not discovered the wireless power reception device (301), for example, if there is no response to a power signal transmitted externally. If a response signal is received from the wireless power reception device (301), a connection may be formed between the wireless power transmission device (101) and the wireless power reception device (301).

In operation 806, according to an embodiment, the wireless power transmission device (101) may request identification information of the wireless power reception device (301) and/or setting information related to wireless charging. According to an embodiment, the wireless power transmission device (101) may request identification information of the wireless power reception device (301), receive a response thereto from the wireless power reception device (301), and then request setting information related to wireless charging from the wireless power reception device (301). According to an embodiment, the identification information may include at least one of version information, a manufacturing code, or a basic device identifier. According to an embodiment, the setting information may include at least one of a wireless charging frequency, a maximum chargeable power, a charging required power amount, or an average transmission power amount. Alternatively, the setting information may include at least one of voltage, current, status or temperature information of the wireless power reception device (301).

In operation 808, according to one embodiment, the wireless power receiver (301) may transmit identification information and/or configuration information to the wireless power transmitter (101). The wireless power transmitter (101) may generate a power transfer contract used for power charging with the wireless power receiver (301) based at least in part on the received identification information and/or configuration information. For example, the power transfer contract may include limits of parameters that determine power transfer characteristics in a power transfer state. The limits may include at least one of version information of the power transfer contract, identification information of the wireless power receiver (301) or a manufacturer, power class, expected maximum power information, option settings, time information for average received power, or a method for determining current of a main cell of the wireless power transmitter (101).

In operation 810, according to one embodiment, the wireless power transmitter (101) may transmit a charging control signal to perform wireless charging to the wireless power receiver (301). When identification and setting information is received in operation 808, the wireless power transmitter (101) may enter a wireless power transmission mode and transmit a control signal (e.g., a PRU (power receiving unit) control signal) to cause the wireless power receiver (301) to perform charging. In the wireless power transmission mode, the wireless power transmitter (101) may transmit wireless power. The command signal (e.g., a PRU control signal) transmitted by the wireless power transmitter (101) may include information for enabling/disabling charging of the wireless power receiver (301) and permission information. For example, the command signal may be transmitted whenever a charging state is changed. For example, the control signal may be transmitted every 250 ms.

In operation 812, according to one embodiment, the wireless power receiving device (301) may transmit information indicating the status of the wireless power receiving device (301) for the command signal. The wireless power receiving device (301) may change a setting according to the control signal and transmit information (e.g., a PRU dynamic signal) indicating the status of the wireless power receiving device (301) to the wireless power transmitting device (101). The PRU dynamic signal may include at least one of voltage, current, wireless power receiver status, and temperature information. The wireless power transmitting device (101) may calculate a transmission loss of wireless power transmitted to the wireless power receiving device (101) based on the information.

In operation 814, according to one embodiment, the wireless power transmitter (101) may transmit power to the wireless power receiver (301). The wireless power transmitter (101) may change the first power generated by the battery (189) into a second power higher than the first power through the charging circuit (210) and transmit the second power to the wireless power receiver (301) through the coil (314). For example, the wireless power transmitter (101) may transmit power to the wireless power receiver (301) based on a power transfer agreement. For example, if the wireless power transmitter (101) monitors parameters within the power transfer agreement and determines that power transmission with the wireless power receiver (301) violates limitations included in the power transfer agreement, the wireless power transmitter (101) may cancel the power transmission.

In operation 816, according to one embodiment, the wireless power receiving device (301) may receive wireless power transmitted from the wireless power transmitting device (101) and charge the battery (325). According to one embodiment, the wireless power receiving device (301) may change the second power received through the coil (324) into first power lower than the second power and charge the battery (325). The wireless power receiving device (301) may wirelessly receive power from the wireless power transmitting device (101) through the coil (324) based on an inductive method, and may charge the battery (325) by adjusting the received power through the wireless charging IC (323) and the PMIC (322). The wireless power receiving device (301) may adjust the voltage level or current level of the received power and charge the battery (325) with the adjusted power. According to one embodiment, the wireless power receiving device (301) can request adjustment of voltage or current of wireless power output from the wireless power transmitting device (101), and the wireless power transmitting device (101) can adjust the amount of power transmitted based on the request.

In operation 818, according to an embodiment, the wireless power receiving device (301) may transmit a control signal to the wireless power transmitting device (101) during wireless charging. The control signal may include, for example, at least one of a control error signal, a received power signal, a charge status signal, time information to be set in a timer, or a power hold mode start signal. For example, when a temperature generated in the wireless power receiving device (301) during wireless charging exceeds a threshold temperature (e.g., 40 ^o C), a power hold mode start signal for causing the wireless power transmitting device (101) to stop power transmission may be transmitted to the wireless power transmitting device (101) via in-band communication to request the stop of wireless power transmission. According to an embodiment, the power hold mode start signal may include time information to be set in a timer driven by the wireless power transmitting device (101). The time information to be set in the above timer is information about a period during which the wireless power transmission is interrupted by the timer driven by the wireless power transmission device (101). The wireless power transmission device (101) can identify a period during which the wireless power transmission is interrupted by the timer. The period can be set to a different value depending on the type or state of the wireless power reception device (301). The wireless power reception device (301) can drive the timer based on the transmission of the power hold mode start signal and not receive wireless power from the wireless power transmission device (101) for a predetermined period (e.g., 3 minutes). When the predetermined time (e.g., 3 minutes) has elapsed, or when it is determined that the temperature generated from the wireless power receiving device (301) during wireless charging does not exceed a threshold temperature (e.g., 38 ^o C), the wireless power receiving device (301) may transmit a signal to the wireless power transmitting device (101) via in-band communication to release the power transmission interruption, thereby allowing the wireless power transmitting device (101) to retransmit wireless power to the wireless power receiving device (301).

In operation 820, according to one embodiment, the wireless power receiving device (301) may transmit a wireless power hold mode release signal. The wireless power receiving device (301) may identify a temperature generated by the wireless power receiving device (301), and if the identified temperature exceeds a threshold temperature (e.g., 38° C.), the wireless power hold mode release signal may be transmitted to the wireless power transmitting device (101). The temperature may be generated by at least some of charging, internal components of the wireless power receiving device (301), or external influences of the wireless power receiving device (301). When the wireless power receiving device (301) wishes to release the wireless power hold mode, the wireless power transmitting device (101) may transmit the wireless power hold mode release signal to the wireless power transmitting device (101) through the wireless charging IC (324). The wireless power hold mode release signal may be lost (or an error) depending on a communication state with the wireless power transmitting device (101). Even if such a loss (or error) occurs, the wireless power hold mode of the wireless power transmission device (101) can be released when a critical period of time has elapsed since the timer is operated in the wireless power transmission device (101). The wireless power hold mode release signal can be transmitted to the wireless power reception device (301) based on the ping signal received from the wireless power transmission device (101). The wireless power hold mode release signal can be transmitted at least once.

In operation 822, according to one embodiment, the wireless power receiving device (301) may continue to receive power received from the wireless power transmitting device (101) based on the signal for releasing the transmitted power transmission interruption. The wireless power transmitting device (101) may release the wireless power hold mode and switch to a charging mode based on the wireless power hold mode release signal received from the wireless power receiving device (301), and may restart transmitting wireless power to the wireless power receiving device (301). The wireless power transmitting device (101) may periodically identify a temperature generated in the wireless power receiving device (301) through a sensor that detects a temperature included in the sensor module (176) to determine whether to transmit wireless power. According to one embodiment, the wireless power receiving device (301) may also periodically identify the temperature generated to determine whether to transmit a signal for stopping the power transmission or a signal for releasing the power transmission interruption.

FIG. 9 is a flowchart illustrating operations of a wireless power transmitting device wirelessly transmitting power to a wireless power receiving device according to various embodiments.

A method for wireless power transmission may include operations 902 to 908. The method for wireless power transmission may be performed by at least one of a wireless power transmission device (e.g., the wireless power transmission device (101)), or at least one circuit or processor (e.g., the processor (311)) of the wireless power transmission device. In one embodiment, the method may omit at least one of operations 902 to 908, perform some operations in parallel at the same time, change the order of some operations, or add other operations.

In operation 902, according to one embodiment, the wireless power transmitter (101) (e.g., the processor (311)) may transmit wireless power to the wireless power receiver (301). The wireless power transmitter (101) may detect a change in at least one of the frequency, current, or voltage of the charging circuit (210) to identify the wireless power receiver (301). The wireless power transmitter (101) may identify the wireless power receiver (301) by applying a power beacon at a predetermined cycle in a basic mode (or state) for inductive charging. The wireless power transmitter (101) may detect the wireless power receiver (301) by applying current to the charging circuit (210) and measuring the impedance of the coil (314) (e.g., a conductive pattern). The wireless power transmission device (101) can detect the wireless power reception device (301) through the operations disclosed in FIG. 8 and wirelessly transmit power to the detected wireless power reception device (301). The wireless power transmission device (101) (e.g., processor (311)) can change the first power generated by the battery (189) into second power higher than the first power and transmit third power, which is at least a portion of the second power, to the wireless power reception device (301) through the coil (314).

In operation 904, according to one embodiment, the wireless power transmission device (101) (e.g., the processor (311)) may stop wireless power transmission based on the state of the wireless power reception device (301). The wireless power transmission device (101) may receive a signal indicating the state of the wireless power reception device (301) from the wireless power reception device (301). The signal may include time information for setting an operation period of a timer driven in the wireless power transmission device (101). The wireless power transmission device (101) may drive the timer based on the received signal and stop transmission of the wireless power to the wireless power reception device (301). According to one embodiment, the signal indicating the state of the wireless power reception device (301) may include information on a temperature generated in the wireless power reception device, information on a period during which transmission of the wireless power will be stopped, or information on at least one of complete charging. According to one embodiment, the signal may include information indicating that charging of the battery of the wireless power receiving device (301) is complete.

According to one embodiment, the wireless power transmitter (101) may enter a power hold mode based on the received signal and stop transmitting the wireless power to the wireless power receiver (301). According to one embodiment, based on the entry into the power hold mode, the wireless power transmitter (101) may drive a timer. According to one embodiment, the wireless power receiver (301) may enter the power hold mode based on the transmission of the signal. Although the power hold mode is a wireless power transmission mode, the wireless power transmitter (101) may internally operate as if it has been changed to a mode for transmitting a ping signal. The wireless power receiver (301) may enable only some components (e.g., a ping detector (510)) and disable the remaining components. In this case, when the wireless power transmission device (101) transmits a ping signal to the wireless power reception device (301), the ping detector (510) of the wireless power reception device (301) can transmit a response to the received ping signal to the wireless power transmission device (101). Through this, the wireless power transmission device (101) and the wireless power reception device (301) can determine whether to start, maintain, or release the power hold mode. The wireless power reception device (301) can identify the ping signal transmitted by the wireless power transmission device (101) through the ping detector (510), and when it wants to release the power hold mode, it can transmit a signal for releasing the power hold mode to the wireless power transmission device (101) through the wireless charging IC (323).

In one embodiment, if a response to the ping signal is lost (or erroneous) a predetermined number of times (e.g., twice) or more, the wireless power transmission device (101) may identify that the wireless power reception device (301) is detached and may stop the power transmission mode. In one embodiment, at least one of the wireless power transmission device (101) or the wireless power reception device (301) may release the power hold mode based on a signal for releasing the power hold mode. The wireless power transmission device (101) may receive a signal for releasing the power hold mode from the wireless power reception device (301) and release the power hold mode.

According to one embodiment, at least one of the wireless power transmitter (101) (e.g., the processor (311)) or the wireless power receiver (301) (e.g., the processor (321)) may drive a timer for measuring a time for which the wireless power transmission and reception is interrupted when the wireless power transmission and reception is interrupted. The wireless power transmitter (101) may identify a period for which the wireless power transmission is interrupted based on the driven timer, and compare the identified period with a threshold period (e.g., 3 minutes). According to one embodiment, the wireless power transmitter (101) may set (or identify) a maximum maintenance time of the power hold mode through the timer. The period of the timer may be adjusted using at least one state (e.g., temperature) of the wireless power transmitter (101) or the wireless power receiver (301), at least one of a PRMC or a unique identifier received from the wireless charging receiver (301), and may be set differently depending on the state. Alternatively, the period of the timer may be set differently depending on the type of the wireless power receiving device (301). For example, if the wireless charging receiving device (301) is a wearable device, the period may be set to 1 minute, and if the wireless power receiving device (301) is a watch, the period may be set to 2 minutes. The set period (e.g., 1 minute or 2 minutes) may be adjusted. According to one embodiment, when the temperature is high, the timer may be set to a relatively longer time than when the temperature is low. Alternatively, when the temperature is close to the heat generation control temperature, the timer may be set to a relatively short time. The wireless power transmission device (101) may identify the temperature generated in the wireless power receiving device (301) through a response signal to the ping signal transmitted to the wireless power receiving device (301). The threshold period set to the timer may be variably adjusted. According to one embodiment, the threshold period may vary depending on whether at least one of the wireless power transmitter (101) or the wireless power receiver (301) is being used. For example, if the user is using either of the two devices, the threshold period of the timer may be set shorter than otherwise. Whether the user is using the device may be identified by a combination of at least some of the following: whether the acceleration sensor included in the sensor module (176) moves, whether the screen displayed on the display device (160) is active, or whether the processor (120) is active.

According to one embodiment, when the power hold mode is released in the wireless power transmitter (101), the wireless power transmitter (101) may re-enter the power hold mode based on a request from the wireless power receiver (301). According to one embodiment, when the timer is set to a threshold period (e.g., 3 minutes), the power hold mode may be released regardless of whether a signal for releasing the power hold mode is received.

In operation 906, according to one embodiment, the wireless power transmission device (101) (e.g., the processor (120)) can identify whether the period of interruption of the transmission of the wireless power exceeds a threshold period. If the period of interruption of the transmission of the wireless power exceeds the threshold period (e.g., 3 minutes), the wireless power transmission device (101) can identify the temperature generated in the wireless power reception device (301) through the sensor module (176). According to one embodiment, the wireless power transmission device (101) can periodically receive information indicating the status of the wireless power reception device (301) from the wireless power reception device (301) while transmitting wireless power to the wireless power reception device (301). The wireless power transmission device (101) can identify the current temperature generated in the wireless power reception device (301) based on the periodically received information.

According to one embodiment, the wireless power transmitter (101) can identify whether the identified temperature exceeds a first threshold temperature (e.g., 40°C). The first threshold temperature (e.g., 40°C) is a temperature preset so that no failure or error occurs when at least one function operable in the wireless power receiver (301) that receives wireless power operates normally while the wireless power receiver (301) receives wireless power. The threshold temperature can be variably adjusted. If the identified temperature exceeds the threshold temperature, the wireless power transmitter (101) can maintain the suspension of the transmission of the wireless power. If the identified temperature exceeds the threshold temperature, the wireless power transmitter (101) can determine that the wireless power receiver (301) is currently in an overheated state due to charging and can stop the transmission of the wireless power. After the wireless power transmission is stopped, if time passes and the identified temperature does not exceed the second threshold temperature (e.g., 38°C), the wireless power transmission device (101) may release the wireless power transmission mode and retransmit the wireless power to the wireless power reception device (301). For example, if the identified temperature exceeds the second threshold temperature (e.g., 38°C), the stoppage of the wireless power transmission may be maintained.

According to one embodiment, the wireless power transmitter (101) can identify whether a signal for releasing the wireless power interruption is received from the wireless power receiver (301) through a communication circuit (e.g., a wireless charging IC (313)). The signal for releasing the wireless power interruption can be received from the wireless power receiver (301) in an in-band manner based on a ping signal that the wireless power transmitter (101) transmits to the wireless power receiver (301). The wireless charging IC (313) can include a demodulation circuit for demodulating the ping signal. According to one embodiment, the wireless power transmitter (101) can demodulate the received signal through the demodulation circuit to release the wireless power interruption. After releasing the wireless power interruption, the wireless power transmitter (101) can identify a temperature generated in the wireless power receiver. According to one embodiment, the wireless power transmitter (101) can release the wireless power interruption if the temperature generated from the wireless power receiver (301) does not exceed a second threshold temperature (e.g., 38°C). If the identified temperature exceeds a first threshold temperature (e.g., 40°C), the wireless power transmitter (101) can maintain the interruption of the transmission of the wireless power. According to one embodiment, if the identified temperature does not exceed a second threshold temperature (e.g., 38°C), the wireless power can be retransmitted to the wireless power receiver (301).

In operation 908, according to one embodiment, the wireless power transmitter (101) (e.g., the processor (311)) may retransmit wireless power to the wireless power receiver (301). If the period of suspension of the transmission of the wireless power exceeds the threshold period, the wireless power transmitter (101) may release the suspension of the wireless power transmission and retransmit the wireless power to the wireless power receiver (301). According to one embodiment, if the period of suspension of the transmission of the wireless power does not exceed the threshold period, and a signal for releasing the suspension of the wireless power is received from the wireless power receiver (301), the suspension of the wireless power transmission may be released and the wireless power transmitter (101) may retransmit the wireless power to the wireless power receiver (301).

According to one embodiment, when the signal for releasing the interruption of the wireless power is received from the wireless power receiving device (301), the wireless power transmitting device (101) can identify whether the temperature generated from the wireless power receiving device (301) exceeds a second threshold temperature (e.g., 38° C.). The temperature can be identified by the wireless power transmitting device (101) through the sensing circuit (320), or can be identified through information indicating the status of the wireless power receiving device (301) transmitted from the wireless power receiving device (301). According to one embodiment, when the temperature generated from the wireless power receiving device (301) exceeds the second threshold temperature, the wireless power transmitting device (101) can maintain the interruption of the transmission of the wireless power. According to one embodiment, if the temperature generated from the wireless power receiving device (301) does not exceed a second threshold temperature (e.g., 38° C.), the suspension of wireless power transmission is released, and the wireless power transmitting device (101) can retransmit wireless power to the wireless power receiving device (301).

FIG. 10 is a flowchart illustrating operations of a wireless power receiving device wirelessly receiving power and charging according to various embodiments.

A method for wirelessly receiving and charging power may include operations 1002 to 1006. The method for wirelessly receiving and charging power may be performed by at least one of a wireless power receiving device (e.g., the wireless power receiving device (301)), or at least one circuit or processor (e.g., the processor (321)) of the wireless power receiving device. In one embodiment, the method may omit at least one of operations 1002 to 1006, perform some operations simultaneously and in parallel, change the order of some operations, or add other operations.

In operation 1002, according to one embodiment, the wireless power receiving device (301) (e.g., the processor (321)) may receive wireless power from the wireless power transmitting device (101) and charge the battery (325). The wireless power receiving device (301) may wirelessly receive power from the wireless power transmitting device (101) through the coil (324) based on an inductive method. The wireless power receiving device (301) may adjust a voltage level or a current level of the received power through the wireless charging IC (323) and the PMIC (322), and charge the battery (325) with the adjusted power. According to one embodiment, the wireless power receiving device (301) may change the second power received through the coil (324) into first power lower than the second power and charge the battery (325).

In operation 1004, according to one embodiment, the wireless power receiving device (301) (e.g., the processor 321) may transmit a signal indicating a status of the wireless power receiving device (301) to the wireless power transmitting device (101). The control signal may include, for example, at least one of a control error signal, a reception power signal, a charging status signal, time information to be set in a timer, a power hold mode start signal (e.g., a power transmission stop signal), or a power hold mode release signal (e.g., a power transmission stop release signal). The power hold mode start signal may include time information to be set in a timer driven by the wireless power transmitting device (101). The time information to be set in the timer is information about a period during which the wireless power transmission is stopped through the timer driven by the wireless power transmitting device (101). The wireless power transmitting device (101) may identify a period during which the wireless power transmission is stopped through the timer. According to one embodiment, when the temperature generated from the wireless power receiving device (301) during wireless charging exceeds a first threshold temperature (e.g., 40°C), the wireless power transmitting device (101) may transmit a power transmission interruption signal to the wireless power transmitting device (101) via in-band communication to interrupt power transmission. The power transmission interruption signal may include information about a time set in a timer. For example, the temperature generated from the wireless power receiving device (301) may be periodically identified to determine whether to transmit the power transmission interruption release signal. For example, when the temperature does not exceed a second threshold temperature (e.g., 38°C) after a threshold period (e.g., 3 minutes), the wireless power receiving device (301) may transmit a power transmission interruption release signal to the wireless power transmitting device (101) via in-band communication, thereby causing the wireless power transmitting device (101) to retransmit wireless power to the wireless power receiving device (301).

In operation 1006, according to one embodiment, the wireless power receiving device (301) (e.g., the processor (321)) can recharge the battery (325) with wireless power retransmitted from the wireless power transmitting device (101) after the transmission of wireless power has been interrupted for a critical period of time based on the transmission of the signal. The wireless power receiving device (301) can receive power from the wireless power transmitting device (101) based on the transmitted power transmission interruption release signal.

FIG. 11 is a flowchart showing the operation of wireless power transmission and reception between a wireless power transmitting device and a wireless power receiving device according to various embodiments.

A method for wireless power transmission and reception may include operations 1102 to 1136. The method for wireless power transmission and reception may be performed by at least one of a wireless power transmitting device (e.g., a wireless power transmitting device (101)), or at least one circuit or processor (e.g., a processor (311)) of the wireless power transmitting device, and at least one of a wireless power receiving device (e.g., a wireless power receiving device (301)), or at least one circuit or processor (e.g., a processor (321)) of the wireless power receiving device. In one embodiment, the method may omit at least one of operations 1102 to 1136, perform some operations in parallel at the same time, change the order of some operations, or add other operations.

In operation 1102, according to one embodiment, a wireless power transmitter (101) may transmit wireless power to a wireless power receiver (101). The wireless power transmitter (101) may transmit wireless power to the wireless power transmitter (101) through a coil (314) based on an inductive method. The wireless power transmitter (101) may change first power generated by a battery (189) into second power higher than the first power through a charging circuit (210) and transmit the second power to the wireless power receiver (301) through the coil (314). The transmission of the wireless power may be initiated based on at least one operation disclosed in FIG. 8.

In operation 1104, according to one embodiment, the wireless power receiving device (301) can charge the battery (325) with the received wireless power. The wireless power receiving device (101) can adjust a voltage level or a current level of the received wireless power and charge the adjusted battery to the battery (325). According to one embodiment, the wireless power receiving device (301) can change the second power received through the coil (324) into a first power lower than the second power and charge the battery (325).

In operation 1106, according to one embodiment, the wireless power receiving device (301) can identify the temperature generated in the wireless power receiving device (301). The wireless power receiving device (301) can periodically identify the temperature generated in the wireless power receiving device (301). The wireless power receiving device (301) can periodically identify the temperature generated in the wireless power receiving device (301) in order to identify whether wireless power transmitted from the wireless power transmitting device (101) is received.

In operation 1108, according to one embodiment, the wireless power receiving device (301) can identify whether the identified temperature exceeds a first threshold temperature (e.g., 40°C). The wireless power receiving device (301) can identify whether the generated temperature exceeds the first threshold temperature (e.g., 40°C), thereby identifying whether wireless power transmitted from the wireless power transmitting device (101) is received. The wireless power receiving device (301) can perform operation 1116 if the identified generated temperature exceeds the first threshold temperature, and can perform operation 1110 if the identified generated temperature does not exceed the first threshold temperature.

In operation 1110, according to one embodiment, the wireless power receiving device (301) can identify whether charging is completed. If the generated temperature does not exceed the threshold temperature (e.g., 40° C.), the wireless power receiving device (301) can identify whether charging is completed based on the wireless power that is continuously received. For example, if the charging is not completed, the wireless power receiving device (301) can repeatedly perform the operations performed in operations 1102 to 1108. If charging is completed, the wireless power receiving device (301) can perform operation 1112, and if charging is not completed, can perform operation 1104.

In operation 1112, according to one embodiment, the wireless power receiving device (301) can transmit a charging completion signal to the wireless power transmitting device (101). When the charging is completed, the wireless power receiving device (301) can transmit a signal indicating that the charging is completed to the wireless power transmitting device (101). After transmitting the signal indicating that the charging is completed to the wireless power transmitting device (101), the wireless power receiving device (301) can release the charging mode.

In operation 1114, according to one embodiment, the wireless power transmission device (101) can terminate wireless power transmission. The wireless power transmission device (101) can terminate transmission of wireless power transmitted to the wireless power reception device (301) and release the charging mode based on a signal indicating that charging is completed received from the wireless power reception device (301).

In operation 1116, according to one embodiment, if the identified heating temperature exceeds the first threshold temperature (e.g., 40° C.), the wireless power receiving device (301) may operate in a wireless power hold mode and detect a ping signal transmitted from the wireless power transmitting device (101). In operation 1108, if the identified heating temperature exceeds the first threshold temperature, the wireless power receiving device (301) may operate in a power hold mode by keeping a component of a ping detector (510) capable of detecting the ping signal transmitted from the wireless power transmitting device (101) in an enabled state. Alternatively, the wireless power receiving device (301) may identify that the wireless power receiving device (301) is currently operating in the power hold mode by detecting the ping signal. Alternatively, the wireless power receiving device (301) may be operated in a power hold mode by keeping at least one other component (e.g., wireless charging IC (323), PMIC (322), etc.) that receives wireless power and charges in a disabled state.

In operation 1118, according to an embodiment, the wireless power receiving device (301) may transmit a signal requesting the start of the wireless power hold mode to the wireless power transmitting device (101). According to an embodiment, the wireless power receiving device (301) may transmit a signal requesting the start of the wireless power hold mode to the wireless power transmitting device (101) in response to detection of the ping signal. The wireless power receiving device (301) may transmit the signal requesting the start of the wireless power hold mode to the wireless power transmitting device (101) at least once. The signal requesting the start of the wireless power hold mode may include time information to be set in a timer driven by the wireless power transmitting device (101). The time information to be set in the timer is information on a period during which the wireless power transmission is interrupted can be identified through the timer driven by the wireless power transmitting device (101). The wireless power transmission device (101) can identify the period during which the wireless power transmission is interrupted through the timer. The period during which the wireless power transmission is interrupted is set in the wireless power reception device (101), and may be set differently depending on the type of the wireless power reception device (101). For example, if the wireless charging reception device (301) is a wearable device, the period may be set to 1 minute, and if the wireless power reception device (301) is a watch, the period may be set to 2 minutes.

In operation 1120, according to one embodiment, the wireless power transmission device (101) can operate in a wireless power hold mode based on the received signal. The wireless power transmission device (101) can switch a charging mode to a wireless power hold mode based on the received signal. When the charging mode is switched to the wireless power hold mode, the wireless power transmission device (101) can stop transmitting wireless power.

In operation 1122, according to one embodiment, when the wireless power hold mode is operated, the wireless power transmission device (101) may drive a timer. The wireless power transmission device (101) may drive the timer based on a set period of the timer included in a signal requesting the start of the wireless power hold mode. When the wireless power hold mode is operated, the wireless power transmission device (101) may drive a timer to identify a period during which the wireless power hold mode is maintained. According to one embodiment, the wireless power transmission device (101) may set (or identify) a maximum maintenance time of the power hold mode through the timer. The time of the timer may be set differently depending on a state (e.g., temperature) of at least one of the wireless power transmission device (101) or the wireless power reception device (301).

In operation 1124, according to one embodiment, the wireless power receiving device (301) can identify a temperature being generated and determine whether the identified temperature exceeds a second threshold temperature (e.g., 38°C). The wireless power receiving device (301) can transmit a signal requesting initiation of the wireless power hold mode to the wireless power transmitting device (101), identify a temperature being generated in the wireless power receiving device (301), and determine whether the identified temperature does not exceed the second threshold temperature (e.g., 38°C). According to one embodiment, the wireless power receiving device (301) can periodically determine whether the temperature does not exceed the second threshold temperature. The wireless power receiving device (301) can transmit a signal to the wireless power transmitting device (101) to release the wireless power hold mode by periodically identifying whether the temperature does not exceed the threshold temperature, even if the timer driven by the wireless power transmitting device (101) does not exceed the threshold period. The wireless power receiving device (301) can perform operation 1126 if the identified heating temperature does not exceed the second threshold temperature, and can perform operation 1124 again after a predetermined time elapses if the identified heating temperature exceeds the second threshold temperature.

In operation 1126, according to one embodiment, if the identified temperature does not exceed the second threshold temperature, the wireless power receiving device (301) may transmit a signal for releasing the wireless power hold mode to the wireless power transmitting device (101). If the wireless power receiving device (301) wishes to release the wireless power hold mode, the wireless power receiving device (301) may transmit the wireless power hold mode release signal to the wireless power transmitting device (101) through the wireless charging IC (324). The wireless power hold mode release signal may be lost (or erroneous) depending on the communication status with the wireless power transmitting device (101). Even if such a loss (or error) occurs, since a timer is operated in the wireless power transmitting device (101), the wireless power hold mode in the wireless power transmitting device (101) may be released when a threshold period has elapsed. The wireless power hold mode release signal may be transmitted to the wireless power receiving device (301) based on the ping signal received from the wireless power transmitting device (101). The wireless power hold mode release signal may be transmitted at least once periodically.

In operation 1128, according to one embodiment, the wireless power transmitter (101) can identify whether the wireless power hold release signal is received. If the wireless power hold release signal is received, the wireless power transmitter (101) can release the wireless power hold mode in operation 1130 and retransmit the wireless power to the wireless power receiver (301) as in operation 1002. According to one embodiment, the wireless power transmitter (101) can identify a period during which the wireless power hold is maintained through the driven timer, and even if the identified period does not exceed a threshold period (e.g., 3 minutes), if the wireless power hold release signal is received, release the wireless power hold mode in operation 1130 and retransmit the wireless power to the wireless power receiver (301) as in operation 1102. The wireless power transmission device (101) may perform operation 1134 when a wireless power hold release signal is received, and may perform operation 1132 when the wireless power hold release signal is not received. According to one embodiment, the wireless power transmission device (101) may perform operation 1130 to release the wireless power hold mode when a wireless power hold release signal is received.

In operation 1132, according to one embodiment, when the wireless power hold release signal is received, the wireless power transmission device (101) may identify whether a period during which the wireless power hold is maintained exceeds a threshold period based on the driven timer. If the identified period does not exceed the threshold period (e.g., 1 minute or 3 minutes), it may periodically identify whether the wireless power hold release signal is received, as in operation 1128. The threshold period may be adjusted according to the type or charging state of the wireless power reception device (301) (e.g., a state in which the wireless power reception device (301) is placed on the wireless power transmission device (101).

In operation 1132, according to one embodiment, if the period during which the wireless power hold is maintained is identified as exceeding the threshold period, the wireless power transmitter (101) may identify a temperature generated in the wireless power receiver (301). If the period during which the wireless power hold is maintained is identified as exceeding the threshold period, the wireless power transmitter (101) may identify a temperature generated in the wireless power receiver (301) through a temperature sensor provided in the sensor module (176) of the wireless power transmitter (101) in operation 1134. If the wireless power hold period exceeds the threshold period, the wireless power transmitter (301) may perform operation 1134, and if the wireless power hold period does not exceed the threshold period, the wireless power transmitter (301) may perform operation 1128.

In operation 1136, according to one embodiment, if the identified temperature does not exceed the second threshold temperature (e.g., 38°C), the wireless power transmitter (101) may release the wireless power hold mode and transmit wireless power to the wireless power receiver (301). If the identified temperature does not exceed the second threshold temperature, the wireless power transmitter (101) may release the wireless power hold mode in operation 1130 and transmit wireless power to the wireless power receiver (301) as in operation 1102. If the identified temperature exceeds the second threshold temperature (e.g., 38°C), the wireless power transmitter (101) may re-identify the temperature generated in the wireless power receiver (301) after a predetermined period of time has elapsed. According to one embodiment, if the identified temperature exceeds the second threshold temperature, the wireless power transmission device (101) may periodically re-identify the temperature generated from the wireless power reception device (301) through the sensor module (176). In operation 1136, if the identified generation temperature does not exceed the threshold period, the wireless power transmission device (301) may perform operation 1130, and if the identified generation temperature exceeds the threshold period, the wireless power transmission device (301) may perform operation 1134.

According to various embodiments, a method of a wireless power transmitting device transmitting power may include transmitting wireless power to a wireless power receiving device, stopping transmission of the wireless power based on a state of the wireless power receiving device, identifying whether a period of time during which the wireless power transmission was stopped exceeds a threshold period, and retransmitting wireless power to the wireless power receiving device based on the period of time during which the wireless power transmission was stopped exceeding the threshold period.

According to one embodiment, the method further includes receiving a signal for stopping transmission of the wireless power from the wireless power receiving device, and stopping transmission of the wireless power to the wireless power receiving device based on the received signal, wherein the signal for stopping transmission of the wireless power may include at least one of information on a temperature generated in the wireless power receiving device or information on a period during which transmission of the wireless power is to be stopped.

According to one embodiment, when the transmission of the wireless power is interrupted, the method may further include the actions of driving a timer, identifying the period during which the transmission of the wireless power is interrupted based on the driven timer, and comparing the identified period with the threshold period.

According to one embodiment, the method may further include: identifying a temperature generated in the wireless power receiving device if the period for which the wireless power transmission has been suspended exceeds the threshold period; maintaining the suspension of the wireless power transmission if the identified temperature exceeds the threshold temperature; and releasing the suspension of the wireless power transmission and retransmitting the wireless power to the wireless power receiving device if the identified temperature does not exceed the threshold temperature.

According to one embodiment, the period during which the wireless power transmission is to be interrupted is set in the wireless power receiving device, and may be set differently depending on the type of the wireless power receiving device.

According to one embodiment, the method may further include an operation of identifying whether a signal for releasing the wireless power interruption is received from the wireless power receiving device through a communication circuit of the wireless power transmitting device, an operation of demodulating the received signal to release the wireless power interruption, and an operation of retransmitting the wireless power to the wireless power receiving device.

According to one embodiment, the method may further include an operation of identifying a temperature generated in the wireless power receiving device after releasing the wireless power interruption, and if the identified temperature exceeds a threshold temperature, maintaining the interruption of the transmission of the wireless power, and if the identified temperature does not exceed the threshold temperature, releasing the interruption of the transmission of the wireless power and retransmitting the wireless power to the wireless power receiving device.

According to one embodiment, when a signal for releasing the wireless power interruption is received from the wireless power receiving device while the period of time for which the wireless power transmission was suspended does not exceed the threshold period, the method may further include releasing the interruption of the wireless power transmission and retransmitting the wireless power to the wireless power receiving device.

According to one embodiment, when the signal for releasing the interruption of the wireless power is received from the wireless power receiving device, the method may further include: identifying whether a temperature generated from the wireless power receiving device exceeds a threshold temperature; and, if the temperature generated from the wireless power receiving device exceeds the threshold temperature, maintaining the interruption of the transmission of the wireless power, and if the temperature generated from the wireless power reception does not exceed the threshold temperature, releasing the interruption of the transmission of the wireless power and retransmitting the wireless power to the wireless power receiving device.

FIG. 12 is a diagram showing changes in signal strength before and after receiving a wireless power hold release signal in a wireless power transmission device according to various embodiments.

In the graph shown in Figure 12, the horizontal axis represents the time axis and the vertical axis represents the voltage intensity.

Referring to FIG. 12, the first section (1201) represents a voltage level when the wireless power transmitter (101) transmits wireless power to the wireless power receiver (301). In addition, the second section (1202) represents a voltage level when a wireless power hold start signal is received from the wireless power receiver (301). When the wireless power transmitter (101) receives the wireless power hold start signal through the first section (1201) and the second section (1202), it can be seen that the voltage level is lowered because the wireless power transmitter (101) does not transmit power to the wireless power receiver (301). The wireless power transmitter (101) can periodically transmit a ping signal to the wireless power receiver (301) in the second section (1202). Thereafter, when a wireless power hold release signal is received from the wireless power receiving device (301), the wireless power transmitting device (101) transmits power to the wireless power receiving device (301), and thus, it can be seen that the voltage in the third section (1203) increases more than the voltage in the second section (1202). The voltage magnitude in the third section (1203) may be a voltage of the same magnitude or similar magnitude to the voltage magnitude in the first section (1201).

FIG. 13a is an example diagram showing wireless charging when the wireless charging receiving device is a watch and the wireless charging transmitting device is a smartphone, and FIG. 13b is an example diagram showing wireless charging when the wireless charging receiving device and the wireless charging transmitting device are smartphones.

Referring to FIGS. 13A and 13B , a wireless charging receiving device (e.g., a watch) (301) may be placed on one side (e.g., the back or front) of a wireless charging transmitting device (e.g., a smart phone) (101) and receive wireless power transmitted from the wireless charging transmitting device (e.g., the smart phone) (101) to charge a battery (325) of the wireless charging receiving device (301). Similarly, a wireless charging receiving device (e.g., a smart phone) (1201) may be placed on one side (e.g., the back or rear) of a wireless charging transmitting device (e.g., a smart phone) (101) and receive wireless power transmitted from the wireless charging transmitting device (e.g., the smart phone) (101) to charge a battery (325) of the wireless charging receiving device (301).

The wireless power transmission device (101) can detect that the wireless power reception device (301, or 1301) is placed on the wireless charging transmission device (101) through the sensor module (176). For example, the wireless power transmission device (101) can determine whether the front of the wireless power transmission device (101) is facing the sky or the ground using the gyro sensor in the sensor module (176). When the wireless power transmission device (101) recognizes the wireless charging reception device (301), the wireless power transmission device (101) transmits wireless power to the wireless charging reception device (301, or 1301) through the operations disclosed in FIGS. 8 to 11, and the wireless charging reception device (301, or 1301) can charge the battery (325) of the wireless charging reception device (301) with the wireless power transmitted from the wireless power transmission device (101).

101: Wireless power transmission device 311: Processor
189: Battery 310: Power Transmission Circuit
312: PMIC 313: Wireless Charging IC
314: Coil 301: Wireless power receiving device
320: Power receiving circuit 321: Processor
322: PMIC 323: Wireless Charging IC
324: Coil 325: Battery

Claims (20)

In a wireless power transmission device,
communication circuit;
charging coil; and
comprising at least one processor electrically or operably connected to the communication circuit and the charging coil;
At least one processor of the above,
Controlling the charging coil to transmit wireless power to a wireless power receiving device,
Stop transmitting the wireless power based on the state of the wireless power receiving device,
Identify whether the period of interruption of the above wireless power transmission exceeds a critical period,
The wireless power is set to be retransmitted to the wireless power receiving device based on the period of time during which the wireless power transmission was stopped exceeding the threshold period,
At least one processor of the above,
Identifying whether a signal for releasing the interruption of the transmission of the wireless power is received from the wireless power receiving device through the communication circuit;
By demodulating the received signal, the interruption of the transmission of the wireless power is lifted,
An electronic device configured to retransmit said wireless power to said wireless power receiving device.
In the first paragraph,
At least one processor of the above,
Receive a signal for stopping transmission of the wireless power from the wireless power receiving device,
is set to stop transmitting the wireless power to the wireless power receiving device based on the received signal;
An electronic device in which the signal for stopping the transmission of the wireless power includes at least one of information on the temperature generated in the wireless power receiving device or information on the period for which the transmission of the wireless power is to be stopped.
In the first paragraph,
At least one processor of the above,
When the above wireless power transmission is stopped, the timer is started,
Identifying the period during which the transmission of the wireless power is interrupted based on the timer driven above,
An electronic device configured to compare the identified period with the threshold period.
In the first paragraph,
At least one processor of the above,
If the period of time during which the transmission of the wireless power is interrupted exceeds the threshold period, the temperature generated in the wireless power receiving device is identified,
If the identified temperature exceeds the threshold temperature, the transmission of the wireless power is maintained at a halt,
An electronic device configured to release the interruption to the transmission of said wireless power and retransmit said wireless power to said wireless power receiving device if said identified temperature does not exceed said threshold temperature.
In the second paragraph,
The period during which the above wireless power transmission is interrupted is:
An electronic device set in the wireless power receiving device, characterized in that it is set differently depending on the type of the wireless power receiving device.
delete In the first paragraph,
At least one processor of the above,
When a signal for releasing the wireless power interruption is received, the temperature generated by the wireless power receiving device is identified,
If the identified temperature exceeds the threshold temperature, the transmission of the wireless power is maintained at a halt,
An electronic device configured to release the interruption to the transmission of said wireless power and retransmit said wireless power to said wireless power receiving device if said identified temperature does not exceed said threshold temperature.
In a wireless power transmission device,
communication circuit;
charging coil; and
comprising at least one processor electrically or operably connected to the communication circuit and the charging coil;
At least one processor of the above,
Controlling the charging coil to transmit wireless power to a wireless power receiving device,
Stop transmitting the wireless power based on the state of the wireless power receiving device,
Identify whether the period of interruption of the above wireless power transmission exceeds a critical period,
The wireless power is set to be retransmitted to the wireless power receiving device based on the period of time during which the wireless power transmission was stopped exceeding the threshold period,
At least one processor of the above,
An electronic device configured to release the suspension of the transmission of the wireless power and retransmit the wireless power to the wireless power receiving device when a signal for releasing the suspension of the transmission of the wireless power is received from the wireless power receiving device while the period of the suspension of the transmission of the wireless power does not exceed the threshold period.
In Article 8,
At least one processor of the above,
When the signal for releasing the interruption of the transmission of the wireless power is received from the wireless power receiving device, it is identified whether the temperature generated from the wireless power receiving device exceeds a threshold temperature,
When the temperature generated from the wireless power receiving device exceeds the threshold temperature, the transmission of the wireless power is stopped,
An electronic device configured to release the interruption of transmission of the wireless power and retransmit the wireless power to the wireless power receiving device if the temperature generated from the wireless power receiving device does not exceed the threshold temperature.
In Article 8,
An electronic device characterized in that a signal for releasing the suspension of the wireless power transmission is received from the wireless power receiving device in an in-band manner based on a ping signal transmitted to the wireless power receiving device.
In a method for transmitting power by a wireless power transmission device,
An act of transmitting wireless power to a wireless power receiving device;
An action of stopping transmission of the wireless power based on the state of the wireless power receiving device;
An operation for identifying whether the period of interruption of the transmission of said wireless power exceeds a threshold period; and
The method comprises an operation of retransmitting wireless power to the wireless power receiving device based on the period of time during which the wireless power transmission has been suspended exceeding the threshold period,
An operation of identifying whether a signal for releasing the suspension of transmission of wireless power is received from the wireless power receiving device through the communication circuit of the wireless power transmitting device;
An operation of demodulating the received signal to release the interruption in the transmission of the wireless power; and
A method further comprising the action of retransmitting said wireless power to said wireless power receiving device. delete delete delete delete delete delete delete delete delete

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