Electronic device for wireless communication and communication method

Abstract

This electronic device comprises: a coil configured to wirelessly receive AC power from an external electronic device; a rectifier circuit configured to rectify the AC power received through the coil and output DC power; and a communication circuit that includes an inductor and a switch connected to the inductor and is configured to modulate AC power according to the on / off state of the switch, wherein the communication circuit includes a synchronized data signal generation circuit configured to synchronize a data signal such that the data signal transitions at the center of the square pulse of the AC power, and control the on / off state of the switch by applying the synchronized data signal to the switch.

Description

Electronic devices and methods for wireless communication

[0001] The present disclosure relates to an electronic device and a communication method thereof, and more particularly, to an electronic device that performs communication with a wireless charging device and a communication method thereof.

[0002] Wireless charging is a method of charging external devices without using wires to transfer power. Wireless charging is used to charge various electronic devices, including smartphones, wearable devices, tablets, and earphones. Users can charge their devices' batteries simply by placing them on a charging pad.

[0003] As the number of electronic devices supporting fast charging increases to improve usability, issues regarding the communication circuit between wireless charging devices and electronic devices during fast charging are emerging.

[0004] According to at least one embodiment of the present disclosure, an electronic device includes a coil configured to wirelessly receive AC power from an external electronic device, a rectifier circuit configured to rectify the AC power received through the coil and output DC power, an inductor, and a switch connected to the inductor, and a communication circuit configured to modulate the AC power according to an on / off state of the switch, wherein the communication circuit includes a synchronization data signal generation circuit configured to synchronize a data signal to transition at the center of a rectangular pulse of the AC power and to apply the synchronized data signal to the switch to control the on / off state of the switch.

[0005] According to at least one embodiment of the present disclosure, the switch is turned on during an on period of the synchronization data signal and turned off during an off period of the synchronization data signal, and the on point of the synchronization data corresponds to the center of a rectangular pulse of the AC power.

[0006] According to at least one embodiment of the present disclosure, the synchronization data signal generating circuit is configured to generate the synchronization data signal by synchronizing the on point of the data signal to the center of the rectangular pulse of the AC power.

[0007] According to at least one embodiment of the present disclosure, the synchronization data signal generating circuit is configured to convert the AC power having the rectangular pulse into a triangular pulse signal, generate a signal corresponding to half of a peak voltage of the triangular pulse signal and a center of the rectangular pulse of the AC power based on the triangular pulse signal, and generate the synchronization data signal based on the generated signal and the data signal.

[0008] According to at least one embodiment of the present disclosure, the communication circuit is configured to modulate the synchronization data signal using inductive ASK modulation.

[0009] According to at least one embodiment of the present disclosure, the switch comprises an electronic device that is a back to back switch.

[0010] According to at least one embodiment of the present disclosure, the electronic device includes an AC signal having a frequency of 360 kHz.

[0011] According to at least one embodiment of the present disclosure, a communication method of an electronic device including an inductor and a switch turned on / off based on a synchronization data signal, the communication method includes an operation of wirelessly receiving AC power for obtaining power from an external electronic device through a coil, an operation of applying the synchronization data signal, which is shifted at the center of a rectangular pulse of the AC power, to the switch, and an operation of modulating the AC power according to a state of the switch turned on / off based on the synchronization data signal, and transmitting the modulated AC power to the external electronic device through the coil.

[0012] FIG. 1 is a block diagram of an electronic device within a network environment according to one embodiment.

[0013] FIG. 2 is a drawing for explaining a wireless charging environment according to one embodiment.

[0014] FIG. 3 is a block diagram illustrating a specific configuration of an electronic device according to one embodiment.

[0015] FIG. 4 is a diagram for explaining a synchronization data signal according to one embodiment.

[0016] FIG. 5 is a diagram for explaining a current waveform of an inductor according to a synchronization data signal according to one embodiment.

[0017] FIG. 6 is a drawing for explaining the voltage applied to the receiving coil (320) according to the current of the inductor according to one embodiment.

[0018] FIGS. 7 to 9 are drawings for explaining a method for generating a synchronization data signal according to one embodiment.

[0019] FIG. 10 is a diagram for explaining a synchronization data signal according to one embodiment.

[0020] FIG. 11 is a drawing for more specifically explaining a communication circuit (330) of an electronic device (202) according to one embodiment.

[0021] FIG. 12 and FIG. 13 are diagrams showing the current flowing in the inductor (327) according to the signal applied to the switch (326) according to one embodiment.

[0022] FIG. 14 and FIG. 15 are diagrams showing the characteristics of a signal modulated according to a modulation technique according to one embodiment.

[0023] FIG. 16 is a flowchart illustrating an electronic device communication method according to one embodiment.

[0024] 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 the network environment (100), the electronic device (101) may communicate with the electronic device (102) via a first network (198) (e.g., a short-range wireless communication network), or may communicate with at least one of the electronic device (104) or the server (108) via a second network (199) (e.g., a long-range wireless communication network). In one embodiment, the electronic device (101) may communicate with the electronic device (104) via the server (108). According to one embodiment, the electronic device (101) may include a processor (120), a memory (130), an input module (150), an audio output module (155), a display module (160), an audio module (170), a sensor module (176), an interface (177), a connection terminal (178), 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 connection terminal (178)), or may have one or more other components added. In some embodiments, some of these components (e.g., the sensor module (176), the camera module (180), or the antenna module (197)) may be integrated into one component (e.g., the display module (160)).

[0025] The processor (120) may, for example, execute software (e.g., a program (140)) to control at least one other component (e.g., a hardware or software component) of the electronic device (101) connected to the processor (120) and perform various data processing or operations. According to one embodiment, as at least a part of the data processing or operations, the processor (120) may store commands or data received from other components (e.g., a sensor module (176) or a communication module (190)) in a volatile memory (132), process the commands 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) or an auxiliary processor (123) (e.g., a graphics processing unit, a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor) that can operate independently or together with the main processor (121). For example, when the electronic device (101) includes the main processor (121) and the auxiliary processor (123), 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.

[0026] The auxiliary processor (123) may control at least a portion of functions or states associated with at least one component (e.g., a display module (160), a sensor module (176), or a communication module (190)) of the electronic device (101), 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. In 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)). In one embodiment, the auxiliary processor (123) (e.g., a neural network processing unit) may include a hardware structure specialized for processing artificial intelligence models. The artificial intelligence models may be generated through machine learning. This learning can be performed, for example, on the electronic device (101) itself where the artificial intelligence model is executed, or can be performed through a separate server (e.g., server (108)). The learning algorithm can include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but is not limited to the examples described above. The artificial intelligence model can include multiple artificial neural network layers.The artificial neural network may be one of a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), a deep Q-network, or a combination of two or more of the above, but is not limited to the examples described above. In addition to, or alternatively to, a hardware structure, an artificial intelligence model may include a software structure.

[0027] 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 non-volatile memory (134).

[0028] The program (140) may be stored as software in the memory (130) and may include, for example, an operating system (142), middleware (144), or an application (146).

[0029] The input module (150) can receive commands or data to be used in a component of the electronic device (101) (e.g., a processor (120)) from an external source (e.g., a user) of the electronic device (101). The input module (150) can include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0030] The audio output module (155) can output audio signals to the outside of the electronic device (101). The audio output module (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. The receiver can be used to receive incoming calls. In one embodiment, the receiver can be implemented separately from the speaker or as part of the speaker.

[0031] The display module (160) can visually provide information to an external party (e.g., a user) of the electronic device (101). The display module (160) may 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 module (160) may include a touch sensor configured to detect a touch, or a pressure sensor configured to measure the intensity of a force generated by the touch.

[0032] The audio module (170) can convert sound into an electrical signal, or vice versa, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150), output sound through the sound output module (155), or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphone) directly or wirelessly connected to the electronic device (101).

[0033] The sensor module (176) can detect the operating status (e.g., power or temperature) of the electronic device (101) or the external environmental status (e.g., user status) and generate an electrical signal or data value corresponding to the detected status. 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.

[0034] 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.

[0035] 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., 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).

[0036] The haptic module (179) can convert electrical signals into mechanical stimuli (e.g., vibration or movement) or electrical stimuli that a user can perceive through tactile or kinesthetic sensations. According to one embodiment, the haptic module (179) can include, for example, a motor, a piezoelectric element, or an electrical stimulation device.

[0037] The camera module (180) can capture still images and videos. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0038] 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).

[0039] A battery (189) may power at least one component of the electronic device (101). In one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0040] The communication module (190) may support the 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., electronic device (102), electronic device (104), or server (108)), and the performance of communication through the established communication channel. The communication module (190) may operate independently from the processor (120) (e.g., 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 global navigation satellite system (GNSS) communication module) or a wired communication module (194) (e.g., a local area network (LAN) communication module, or a power line communication module). Among these communication modules, the corresponding communication module can communicate with an external electronic device (104) via a first network (198) (e.g., a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network (199) (e.g., a long-range communication network such as a legacy cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (e.g., a LAN or WAN)). These various types of communication modules can 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) can verify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) by using subscriber information (e.g., an international mobile subscriber identity (IMSI)) stored in the subscriber identification module (196).

[0041] The wireless communication module (192) can support 5G networks and next-generation communication technologies following the 4G network, such as NR access technology (new radio access technology). The NR access technology can support high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and connection of multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency communications)). The wireless communication module (192) can support, for example, a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate. The wireless communication module (192) can support various technologies for securing performance in a high-frequency band, such as beamforming, massive multiple-input and multiple-output (MIMO), full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, or large scale antenna. The wireless communication module (192) can support various requirements specified in the electronic device (101), an external electronic device (e.g., the electronic device (104)), or a network system (e.g., the second network (199)). According to one embodiment, the wireless communication module (192) can support a peak data rate (e.g., 20 Gbps or more) for eMBB realization, a loss coverage (e.g., 164 dB or less) for mMTC realization, or a U-plane latency (e.g., 0.5 ms or less for downlink (DL) and uplink (UL), or 1 ms or less for round trip) for URLLC realization.

[0042] The antenna module (197) can transmit or receive signals or power to or from an external device (e.g., an external electronic device). In one embodiment, the antenna module (197) may include an antenna including a radiator formed of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). In one embodiment, the antenna module (197) may include a plurality of antennas (e.g., an array antenna). 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), may be selected from the plurality of antennas, for example, by the communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device via the at least one selected antenna. In some embodiments, in addition to the radiator, another component (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as a part of the antenna module (197).

[0043] According to various embodiments, the antenna module (197) may form a mmWave antenna module. In one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent a first side (e.g., a bottom side) of the printed circuit board and capable of supporting a designated high-frequency band (e.g., a mmWave band), and a plurality of antennas (e.g., an array antenna) disposed on or adjacent a second side (e.g., a top side or a side side) of the printed circuit board and capable of transmitting or receiving signals in the designated high-frequency band.

[0044] At least some of the above components can be interconnected 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)).

[0045] According to one embodiment, commands 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 external electronic devices (102 or 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 or in addition to executing the function or service itself, request one or more external electronic devices to perform the function or at least a part of the service. One or more external electronic devices that receive the request may execute at least a portion 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 portion of a response to the request. For this purpose, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used, for example. The electronic device (101) may provide an ultra-low latency service by using distributed computing or mobile edge computing, for example. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server utilizing machine learning and / or a neural network. According to one embodiment, the external electronic device (104) or the server (108) may be included in the second network (199).The electronic device (101) can be applied to intelligent services (e.g., smart home, smart city, smart car, or healthcare) based on 5G communication technology and IoT-related technology.

[0046] Electronic devices according to the various embodiments disclosed in this document may take various forms. Electronic devices may include, for example, portable communication devices (e.g., smartphones), computer devices, portable multimedia devices, portable medical devices, cameras, wearable devices, or home appliances. Electronic devices according to the embodiments of this document are not limited to the aforementioned devices.

[0047] The various embodiments of this document and the terminology used therein 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 among those phrases, 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 component) 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.

[0048] The term "module" used in various embodiments of 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 integral component, or a minimum unit or part of such a component 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).

[0049] Various embodiments of the present document may be implemented as software (e.g., a program (140)) including one or more instructions 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 instruction among the one or more instructions stored from the storage medium and execute it. This enables the machine to operate to perform at least one function according to the at least one called instruction. The one or more instructions 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.

[0050] According to one embodiment, the method according to various embodiments disclosed in this document may be provided as included in a computer program product. The computer program product may be traded as a product between a seller and a buyer. The computer program product may be distributed in the form of a machine-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or may be distributed online (e.g., downloaded or uploaded) through an application store (e.g., Play Store) or directly between two user devices (e.g., smart phones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or an intermediary server.

[0051] According to various embodiments, each component (e.g., a module or a program) of the above-described components may include one or more entities, and some of the entities may be separated and placed in other components. According to various embodiments, one or more components or operations of the aforementioned 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 plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. According to various embodiments, the operations performed by a module, program, or other component may be executed sequentially, in parallel, iteratively, 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.

[0052] FIG. 2 is a drawing for explaining a wireless charging environment according to one embodiment.

[0053] Referring to FIG. 2, an external electronic device (201) (e.g., the electronic device (102) of FIG. 1) can wirelessly supply power to an electronic device (202) (e.g., the electronic device (101) of FIG. 1). The external electronic device (201) may be an electronic device operating in a power transmission mode. The external electronic device (201) may be a power transmission device. For example, the external electronic device (201) may be a wireless charging device that supports high-speed wireless charging of 15 W or more. The frequency of an AC (alternating current) signal used for wireless charging may be 360 ​​kHz. However, the present disclosure is not limited thereto, and the external electronic device (201) may transmit power corresponding to 5 W, 8 W, 12 W, 15 W or more, or a combination thereof. The frequency of the AC power may be in a variety of ranges, such as 128 kHz, 87 to 205 kHz, etc.

[0054] The external electronic device (201) may be provided in various forms, such as a pad type, a stand type, a multi-device type, or a built-in type, and is not limited to the above-described forms and may be designed according to the user's usage environment and convenience. For example, the external electronic device (201) may be expressed by various names, such as a wireless charger, a wireless charging pad, a power transmitter, an inductive charger, or a power transmission device.

[0055] The electronic device (202) can wirelessly receive power from an external electronic device (201). The electronic device (202) may be an electronic device operating in a power receiving mode. The electronic device (202) may be a power receiving device. For example, the electronic device (202) may be a user terminal device, a smartphone, a wearable device, a ring device, a tablet PC, a wireless earphone, or the like, but is not limited to a specific type.

[0056] According to one example, the external electronic device (201) may include a power transmission circuit (211), a control circuit (212), and a communication circuit (213).

[0057] According to one example, the power transmission circuit (211) may include a power adapter (211a) that receives power (or electric power) from the outside and appropriately converts the voltage of the input power, a power generation circuit (211b) that generates power, or a matching circuit (211c) that maximizes efficiency between a transmission coil (211L) and a reception coil (221L).

[0058] According to one example, the power transmission circuit (211) may include at least a plurality of power adapters (211a), power generation circuits (211b), transmission coils (211L), or matching circuits (211c) to enable power transmission to a plurality of power receiving devices.

[0059] According to an example, the power transmission circuit (211) may supply battery power or external power supplied to the power adapter (211a) to the power generation circuit (211b) using the power adapter (211a). For example, the battery power may be a signal for obtaining power input to the power adapter (211a) from a battery (not shown) of an external electronic device (201). For example, the external power may be a signal for obtaining power input to the power adapter (211a) from another external electronic device (not shown, e.g., a travel adapter or a power supply). The power adapter (211a) may include a converter circuit. For example, the power adapter (211a) may include a DC / DC converter circuit such as a buck, buck-boost, or boost circuit. The power adapter (211a) may further include an AC / DC converter when the external power is alternating current.

[0060] According to one example, the power transmission circuit (211) can generate a signal for supplying power to the electronic device (202) using the power generation circuit (211b). The generated signal can be transmitted to the transmission coil (221L).

[0061] According to one example, the power transmission circuit (211) can generate a first signal of a first frequency for providing a first power to a first external electronic device and a second signal of a second frequency for providing a second power to a second external electronic device using the power generation circuit (211b). The first signal of the first frequency and the second signal of the second frequency can be generated when the transmission coil (211L) has a multi-coil structure.

[0062] According to one example, the control circuit (212) can perform overall control of the external electronic device (201). For example, the control circuit (212) can determine the power (or amount of power) to be transmitted to the electronic device (202) based on information received from the communication circuit (213). For example, the information can include information for efficiently charging the electronic device (202), such as the battery charging mode of the electronic device (201), the remaining battery capacity, the charging power, the charging status, and the temperature information of the electronic device (202). The control circuit (212) can control the power transmission circuit (211) so that the power generated by the transmission coil (211L) is transmitted to the electronic device (202).

[0063] According to one example, the control circuit (212) may control the power generation circuit (211b) to generate a first signal of a first frequency for providing first power to a first external electronic device and a second signal of a second frequency for providing second power to a second external electronic device when transmitting power to each of a plurality of power receiving devices. To this end, the transmitting coil (211L) may have a multi-coil structure.

[0064] In one example, the communication circuit (213) can communicate with the electronic device (202). For example, the communication circuit (213) can communicate with the communication circuit (223) of the electronic device (202) using a frequency that is the same as or adjacent to the frequency used for power transmission in the transmitting coil (211L). In one example, the communication circuit (213) can communicate with the communication circuit (223) of the electronic device (202) using the transmitting coil (211L).

[0065] For example, data (or communication signal) generated by the communication circuit (213) can be transmitted using the transmission coil (211L). The communication circuit (213) can transmit a signal modulated using various modulation techniques to the electronic device (202) through the transmission coil (211L). For example, the communication circuit (213) can transmit data to the electronic device (202) using the frequency shift keying (FSK) modulation technique. According to one example, the communication circuit (213) can communicate with the communication circuit (223) of the electronic device (202) by changing the frequency of the power signal transmitted through the transmission coil (211L). For example, the communication circuit (213) can express data by increasing or decreasing the frequency of the power transmission signal.

[0066] For example, the communication circuit (213) can receive a signal generated by the communication circuit (223) of the electronic device (202) using the transmission coil (211L). The communication circuit (213) can demodulate a modulated signal received from the electronic device (202) using various demodulation techniques. Here, demodulation may mean a process of extracting an original information signal from the modulated signal. For example, the power transmission device (201) can demodulate a signal received from the electronic device (202). The communication circuit (213) can demodulate a data signal received from the electronic device (202) using any one of Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), or Quadrature Amplitude Modulation (QAM) techniques, or a combination thereof.

[0067] For example, the communication circuit (213) can receive a signal modulated using the Amplitude Shift Keying (ASK) modulation technique in the communication circuit (223) of the electronic device (202). The communication circuit (213) can demodulate the signal by detecting the amplitude of the modulated signal. However, the present invention is not limited thereto, and the communication circuit (213) can also demodulate the signal by detecting not only the amplitude of the modulated signal but also the phase.

[0068] The electronic device (202) may include a receiving coil (221L), a power receiving circuit (221), a control circuit (222) (e.g., a processor (120) of FIG. 1), and a communication circuit (223).

[0069] According to an example, the power receiving circuit (221) may include a receiving coil (221L, 320 in FIG. 3) that wirelessly receives power from an external electronic device (201), a matching circuit (221a, 325 in FIG. 3), or a rectifier circuit (221b, 335 in FIG. 3) that rectifies the received AC power (or AC signal) into DC (Direct Current) power (or DC signal).

[0070] According to one example, the control circuit (222) can perform overall control of the electronic device (202). For example, the control circuit (222) can generate various messages required for wireless power transmission and transmit them to the communication circuit (223). The control circuit (222) can control the operation of the electronic device (202) using the power received by the receiving coil (221L). Controlling the operation of the electronic device (202) may include supplying power to various components of the electronic device (202) using the received power or charging the battery of the electronic device (202) using the received power.

[0071] According to one example, the communication circuit (223) can communicate with the communication circuit (213) of the power transmission device (201) using the receiving coil (221L). Data (or communication signal) generated by the communication circuit (223) can be transmitted using the receiving coil (221L). For example, the communication circuit (223) can transmit data to the external electronic device (201) using an ASK (amplitude shift keying) modulation technique.

[0072] According to an example, the communication circuit (223) may include an inductor (223a), a switch (223b), and a synchronization data signal generation circuit (223c). The communication circuit (223) may transmit data to an external electronic device (201) using an inductive ASK modulation technique. For example, the amplitude or phase of a signal received through a receiving coil (221L, 320 in FIG. 3) may be changed based on the on / off operation of the switch (223b, 326 in FIG. 3) and the current of the inductor (223a, 327 in FIG. 3). Based on the change in the amplitude or phase of the signal, a change in the electromagnetic field between the receiving coil (221L, 320 in FIG. 3) and the transmitting coil (211L, 315 in FIG. 3) may occur. An external electronic device (201) can demodulate data transmitted by an electronic device (202) through changes in an electromagnetic field.

[0073] In one example, the receiving coil (221L) can receive AC power for obtaining power from an external electronic device (201). For example, the external electronic device (201) can transmit AC power for wirelessly providing power to the electronic device (202) through the transmitting coil (211L) using the power transmitting circuit (211). The receiving coil (221L) can receive the AC power.

[0074] In one example, the power receiving circuit (221) can receive AC power through the receiving coil (221L). In one example, the rectifier circuit (221b) can be electrically connected to the receiving coil (221L) through the matching circuit (221a). The rectifier circuit (221b) can receive AC power received by the coil (221L) through the matching circuit (221a) and convert the received AC power into DC power. The DC signal can be provided to the load (224). The load (224) can include various components of the electronic device (202) or a battery (or a battery charging circuit). Depending on the embodiment, the voltage of the DC signal can be adjusted to an appropriate size and provided to the load (224).

[0075] FIG. 3 is a schematic diagram of a circuit diagram of an electronic device and an external electronic device of FIG. 2 according to one embodiment.

[0076] Referring to FIG. 3, an external electronic device (201) (e.g., the external electronic device (201) of FIG. 2) may include an inverter (305), a coil (310), and a transmitting coil (315).

[0077] According to one example, the inverter (305) may be a circuit that receives DC power from an external power source and converts it into AC power. For example, the inverter (305) may include four switching elements (301 to 304) having a full-bridge structure. For example, the switching elements may include MOSFETs. However, the switching elements may be composed of not only MOSFETs but also BJTs (Bipolar Junction Transistors), IGBTs (Insulated-Gate Bipolar Transistors), diodes, MOSFETs, or a combination thereof. For example, a control circuit (e.g., 212 of FIG. 2) may control each of the four switching elements (301 to 304) based on a PWM signal to convert DC power into AC power.

[0078] The AC power converted by the inverter (305) can be transmitted to the electronic device (202) (e.g., the electronic device (202) of FIG. 2) through the transmission coil (315).

[0079] According to an example, the electronic device (202) may include a receiving coil (320), a matching circuit (325), a switch (326), an inductor (327), a synchronization data signal generation circuit (350), a rectifier circuit (335), and a load (340).

[0080] According to one example, the receiving coil (320) can receive AC power from an external electronic device (201). The AC power received through the receiving coil (320) can be input to a rectifier circuit (335).

[0081] According to an example, the rectifier circuit (335) may be a circuit that converts AC power into DC power. For example, the rectifier circuit (335) may include four switching elements (331 to 334) having a full bridge structure. For example, the switching elements may include MOSFETs. However, the switching elements may be composed of not only MOSFETs but also BJTs (Bipolar Junction Transistors), IGBTs (Insulated-Gate Bipolar Transistors), diodes, MOSFETs, or a combination thereof. For example, a control circuit (e.g., 222 of FIG. 2) may control each of the four switching elements (331 to 334) based on a PWM signal to convert AC power into DC power.

[0082] According to one example, the synchronization data generation circuit (350) may generate a synchronization data signal under the control of a control circuit (e.g., 222 of FIG. 2) and apply the synchronization data signal to the switch (326). The synchronization data signal may include a signal in which data transmitted to an external electronic device (201) is encoded. For example, the data may include information about the remaining battery capacity of the electronic device (202), the temperature of the electronic device (202), the amount of power input to the battery, etc. The synchronization data signal may be a signal for transmission to the external electronic device (201). The switch (326) may be controlled based on the synchronization data signal. The synchronization data signal may include at least one piece of information from among CEP (Control Error Packet), Power control, ID (Identification), Configuration (Reference Power), and EPT (End Power Transfer).

[0083] The synchronization data generation circuit (350) may be a switch (326) control circuit for ASK modulation. The synchronization data generation circuit (350) may apply a switch (326) On / Off control signal according to the frequency characteristics applied to the coil. According to one example, the synchronization data signal is applied to the switch (326) and may control the on / off of the switch (326). For example, the switch (326) may be in an on state during an on period of the synchronization data signal, and the switch (326) may be in an off state during an off period of the synchronization data signal. The current flowing in the inductor (327) may change depending on the on / off of the switch (326). When the switch (326) is on, current may flow in the inductor (327), and when the switch (326) is off, current may not flow in the inductor (327). The amplitude or phase of the signal received through the receiving coil (320) may change depending on the current of the inductor (327). Based on the change in the amplitude or phase of the signal, a change in the electromagnetic field between the receiving coil (320) and the transmitting coil (315) may occur. Data may be transmitted to an external electronic device (201) by the change in the electromagnetic field. For example, the external electronic device (201) may demodulate a signal transmitted by the electronic device (202) by the change in the electromagnetic field.

[0084] FIG. 4 is a diagram for explaining a synchronization data signal according to one embodiment.

[0085] According to one example, the synchronization data signal may be a signal including data transmitted to an external electronic device (201). For example, the synchronization data signal may be composed of values ​​of 0 and 1. For example, the on period of the synchronization data signal may be replaced with an expression such as a high level or an expression such as a period indicating a 1 state. The off period of the synchronization data signal may be replaced with an expression such as a low level or an expression such as a period indicating a 0 state.

[0086] In one example, the point at which the synchronization data signal transitions may be determined based on AC power. The AC power may be AC ​​power applied to the rectifier circuit (335).

[0087] A transition may include a point in time when a signal changes from one state to another. For example, a transition of a synchronization data signal may include a transition when the synchronization data signal changes from off to on. For example, the point in time when the synchronization data signal changes from off to on may correspond to the center of a rectangular pulse of AC power. The communication circuit (330) may turn on the switch (326) at the transition point of the synchronization data signal. The point in time when the synchronization data signal turns on may correspond to the center of the rectangular pulse of AC power.

[0088] However, this is not limited to the point where the synchronization data signal changes from off to on, and can be controlled by a signal corresponding to the center of a rectangular pulse of AC power.

[0089] Referring to FIG. 4, the synchronization data signal (410) may be turned on at the center (430) of the rectangular pulse (420) of AC power. For example, the cycle of the rectangular pulse (420) of AC power may include a positive half-cycle (t1) and a negative half-cycle (t2). The center (430) of the positive half-cycle (t1) may be a time point (430) corresponding to the center of the rectangular pulse of AC power. The synchronization data signal (410) may be turned on at the center (430-1 to 430-n) of the rectangular pulse of AC power. In one example, the time point at which the synchronization data signal (410) is turned off may be the center of the rectangular pulse of AC power or another time point. The synchronization data signal (410) may be turned off at any time within a range in which the control circuit (222) can recognize the signal value (0 or 1) of the corresponding cycle. Here, the corresponding cycle may mean a time corresponding to one bit of a digital signal.

[0090] FIG. 5 is a diagram for explaining a current waveform of an inductor (e.g., inductor (327) of FIG. 3) according to a synchronization data signal according to one embodiment.

[0091] The current waveform of the inductor (327) may be determined based on the synchronization data signal. For example, the switch (326) may be in the on state during the on period of the synchronization data signal, and the switch (326) may be in the off state during the off period of the synchronization data signal. Referring to FIG. 5, when the switch (326) is in the off state, no current may flow through the inductor (327). When the synchronization data signal changes from off to on, the switch (326) is turned on, and while the switch (326) is in the on state, current may flow through the inductor (327) based on the AC power.

[0092] The electronic device (202) can modulate a synchronization data signal based on the current flowing in the inductor (327) depending on the on / off state of the switch (326). A method of modulating the synchronization data signal based on the current flowing in the inductor (327) is described in detail below in FIG. 6.

[0093] FIG. 6 is a diagram for explaining the voltage applied to the receiving coil (320) according to the current of the inductor according to one embodiment.

[0094] According to one example, a modulated synchronization data signal may be applied to the receiving coil (320) based on the current of the inductor (327). The modulated synchronization data signal may correspond to a change in the amplitude or phase of the voltage applied to the receiving coil (320). For example, referring to FIG. 6, the amplitude of the voltage applied to the receiving coil (320) by the current flowing through the inductor (327) during a time period (620) in which the switch (326) is turned on may be greater than the amplitude of the voltage applied to the receiving coil (320) during a time period (610, 630) in which the switch (326) is turned off. In addition, the phase of the voltage applied to the receiving coil (320) may change depending on the current in the inductor (327). The external electronic device (202) may receive the modulated data signal from the electronic device (201) through the transmitting coil (315) and demodulate the received signal. For example, the external electronic device (202) can demodulate a synchronization data signal based on changes in the amplitude or phase of the voltage received through the transmitting coil (315).

[0095] FIGS. 7 to 9 are drawings for explaining a method for generating a synchronization data signal according to one embodiment.

[0096] FIG. 7 is a diagram for explaining a synchronization data signal generation circuit according to one embodiment.

[0097] According to FIG. 7, the synchronization data signal generation circuit (705) may be a circuit that generates a synchronization data signal (740) based on a data signal (745) and a rectifier circuit input voltage (700).

[0098] According to an example, the data signal (745) may be a signal containing information to be transmitted from the electronic device (202) to the external electronic device (201). The data signal may be a signal input from the control circuit (222) to the communication circuit (223). The data signal (745) may be a digital signal, meaning a signal that expresses information in the form of binary numbers 0 and 1.

[0099] In one example, the data signal may not be turned on / off at the center of a square pulse of AC power input to the rectifier circuit (335). Specifically, the on / off of the data signal may be independent of the AC power input to the rectifier circuit (335).

[0100] For example, the synchronization data signal may be generated by synchronizing the transition point of the data signal to the center of the AC power (hereinafter referred to as “AC power”) input to the rectifier circuit (335). Synchronizing the transition point of the data signal to the center of the AC power may mean converting the data signal so that the data signal transitions at the center of the AC power. For example, to identify the center of the AC power and / or synchronize the transition point of the data signal to the center of the AC power, a square wave may be generated from the AC power through a square pulse generation circuit (710). A triangle wave may be generated in a triangle wave conversion circuit (715) based on the square wave signal, and a transition point may be determined based on a point at which a designated voltage of the triangle wave is reached. At this time, the transition point of the synchronization data signal may be controlled to be near the center of the AC power. For another example, if the slope of the triangle wave is controlled differently or a designated voltage reference to be compared with the triangle wave is changed, the transition point of the triangle wave conversion circuit may vary.

[0101] According to an example, the synchronization data signal generation circuit (705) may include a square wave generation circuit (710), a triangle wave conversion circuit (715), a peak detector circuit (720), a 1 / 2 output circuit of peak voltage (725), a comparator circuit (730), and a D flip-flop circuit (735).

[0102] According to one example, the square pulse generation circuit (710) can input AC power to an operational amplifier to obtain an output value of the operational amplifier, and input the output value of the operational amplifier to a comparator to generate a square pulse (e.g., signal 1 of FIG. 9). The AC power may be AC ​​power input to a rectifier circuit (335). The square pulse generation circuit (710) can perform a function of removing noise from the AC power. Accordingly, the period of the square pulse, the point in time when it changes from a high level to a low level, or the point in time when it changes from a low level to a high level may be the same as the AC power input to the rectifier circuit (335).

[0103] According to an example, the triangle wave conversion circuit (715) may be a circuit that receives the square pulse and outputs a triangle wave (e.g., signal 2 of FIG. 9).

[0104] For example, the triangle wave conversion circuit (715) can generate a triangle wave by outputting a linearly increasing value while the square pulse is at a high level and outputting 0 [V] while the square pulse is at a low level. The period of the triangle wave can be the same as the period of the square pulse. For example, the triangle wave conversion circuit (715) can include an integrator circuit.

[0105] According to an example, the peak detector circuit (720) may be a circuit that extracts a peak value of an input signal and outputs a signal (e.g., signal 3 of FIG. 9) that maintains the extracted peak value. For example, the peak detector circuit (720) may receive a triangle wave from a triangle wave conversion circuit (715), extract a peak value of the triangle wave, and output the extracted peak value.

[0106] The 1 / 2 peak voltage output circuit (725) (e.g., the 1 / 2 peak voltage output circuit (825) of FIG. 8) can output a signal (e.g., signal 4 of FIG. 9) that maintains a value corresponding to 1 / 2 of the triangle wave peak value received from the peak detector circuit (720).

[0107] For example, the comparator circuit (730) may receive two signals (e.g., a first signal and a second signal) and output a signal (e.g., signal 4 of FIG. 9) corresponding to the center of a rectangular pulse. For example, the comparator circuit (730) may compare the voltage magnitude of the first signal with the voltage magnitude of the second signal, and output a high level if the voltage magnitude of the first signal is greater than the second signal, and output a low level if the voltage magnitude of the first signal is less than the second signal. For example, the first signal may be a triangle wave (e.g., signal 2 of FIG. 9), and the second signal may be a signal corresponding to half of the peak value of the triangle wave. The comparator circuit (730) may output a signal (e.g., signal 5 of FIG. 9) corresponding to the center of the pulse by using the triangle wave (e.g., signal 2 of FIG. 9) and the signal corresponding to half of the peak value of the triangle wave (e.g., signal 4 of FIG. 9). The comparator circuit (730) can output a high level when the voltage of the triangle wave is greater than the voltage of the signal corresponding to half the peak value of the triangle wave, and can output a low level when the voltage of the triangle wave is less than the voltage of the signal corresponding to half the peak value of the triangle wave. The point where the voltage of the signal corresponding to half the peak value of the triangle wave and the voltage of the triangle wave are equal can be the center of the square pulse.

[0108] According to an example, the D flip-flop circuit (735) can generate a synchronization data signal (e.g., signal 7 of FIG. 9) using a signal corresponding to the pulse center (e.g., signal 5 of FIG. 9) and a data signal (e.g., signal 6 of FIG. 9). The data signal can be provided by a control circuit (e.g., 222 of FIG. 2).

[0109] For example, the D flip-flop circuit (735) may be a circuit that outputs a data signal value at the point in time when a signal corresponding to the pulse center rises from a low state to a high state. The D flip-flop circuit (735) may be a circuit that outputs a data signal at the center of a rectangular pulse.

[0110] Referring to FIG. 9, when the data signal is turned on / off, the synchronization data signal can be turned on / off at the center of the AC power closest to the on / off point. For example, when the data signal is turned on at t1, the center point of the spherical pulse of the AC power closest to the point in time t1 can be t2. Therefore, the synchronization data signal can be turned on at the point in time (t2) when the signal (5) corresponding to the pulse center is turned on. When the data signal is turned off at t3, the center point of the spherical pulse of the AC power closest to the point in time t3 can be t4. Therefore, the synchronization data signal can be turned off at the point in time (t4) when the signal (5) corresponding to the pulse center is turned on.

[0111] FIG. 8 is a diagram showing a logic circuit of a synchronization data generation circuit according to one embodiment.

[0112] According to one example, the synchronization data generation circuit may include a square pulse generation circuit (810) (e.g., the square pulse generation circuit (710) of FIG. 7), a triangle wave conversion circuit (815) (e.g., the triangle wave conversion circuit (815) of FIG. 7), a peak detector circuit (820) (e.g., the peak detector circuit (720) of FIG. 7), a half peak voltage output circuit (825) (e.g., the half peak voltage output circuit (825) of FIG. 7), a comparator circuit (830) (e.g., the comparator circuit (730) of FIG. 7), or a D flip-flop circuit (835) (e.g., the D flip-flop circuit (735) of FIG. 7).

[0113] Since the description of each circuit has been described above, a detailed description will be omitted. Meanwhile, the logic circuit illustrated in Fig. 8 is merely one embodiment of a synchronization data signal generation circuit and is not limited to the configuration described above.

[0114] FIG. 10 is a diagram for explaining a synchronization data signal according to one embodiment.

[0115] According to FIG. 10, AC power (1010) may be a signal input to a rectifier circuit (335). A pulse center signal (1020) may be a signal that turns on at the center of the AC power (1010) and turns off at the off point of the AC power (1010). A data signal (1030) may be a signal that includes information to be transmitted to an external electronic device (201).

[0116] In one example, a synchronization data signal (1030) can be generated based on AC power (1010) and a data signal (1030).

[0117] The synchronization data signal (1040) can be turned on / off at the center point of the AC power (1010). The center point of the AC power (1010) can be the point at which the pulse center signal (1020) is turned on.

[0118] For example, since the data signal (1030) is in a low state at the first center point (1050-1) of the AC power (1010), the synchronization data signal (1040) may be in a low state. When the data signal (1030) is turned on between the first center point (1050-1) and the second center point (1050-2), the synchronization data signal (1040) may be turned on at the center of the AC power (1010) closest to the point where the data signal (1030) is turned on, i.e., the second center point (1050-2). Since the data signal (1030) is in a high state at the third center point (1050-3) of the AC power (1010), the synchronization data signal (1040) may remain in a high state. Additionally, when the data signal (1030) is turned off between the fourth time point (1050-4) and the fifth time point, the synchronization data signal (1040) may be turned off at the fifth time point (1050-5).

[0119] FIG. 11 is a drawing for more specifically explaining a communication circuit (330) of an electronic device (202) according to one embodiment.

[0120] According to FIG. 11, the communication circuit (330) may be composed of a switch (1110) (e.g., switch (326) of FIG. 2), an inductor (1120) (e.g., inductor (327) of FIG. 2), and a synchronization data signal generation circuit (350).

[0121] The communication circuit (330) can control the current applied to the inductor (1120) by turning the switch (1110) on / off in accordance with the on / off of the synchronization data signal.

[0122] The switch (1110) of the communication circuit (330) may be composed of two MOSFETs. The two MOSFETs may be configured in a back-to-back structure. In this case, the switch may be designed to eliminate a body diode formed inside the MOSFETs. When the synchronization data signal corresponds to on, the two MOSFETs are turned on, allowing current to flow freely. On the other hand, when the synchronization signal corresponds to off, the two MOSFETs are turned off, preventing current from flowing.

[0123] The inductor (1120) may be connected in series with the switch. Additionally, the inductor (1120) may be a multi-layer type that includes multiple coil layers in a single structure.

[0124] FIGS. 12 and 13 are diagrams showing current flowing in an inductor according to a signal applied to a switch according to one embodiment.

[0125] The current flowing through the inductor can be determined based on the state of the switch. The state of the switch can be determined based on the signal applied to the switch. For example, the switch can be turned on during the on period of the signal applied to the switch, and turned off during the off period of the signal applied to the switch.

[0126] A data signal may be a signal that does not originate from the AC power grid. A data signal is a digital signal, meaning a signal that represents information in the form of binary digits 0 and 1. In this case, 0 and 1 can correspond to low and high states, respectively.

[0127] Figure 12 illustrates the current flowing in an inductor when a data signal is applied to a switch according to one embodiment. The switch may be turned on at a point other than the center of the AC power. At this time, excessive current may flow in the inductor, resulting in overshoot (1210).

[0128] Fig. 13 shows the current flowing in the inductor according to the synchronization data signal according to one embodiment.

[0129] The synchronization data signal may be a signal that turns on at the center point of the AC power. Depending on the synchronization data signal, excessive current may not flow in the inductor at the time the switch turns on (1310).

[0130] The synchronization data signal does not overshoot at the switch-on point, preventing damage to the inductor.

[0131] FIG. 14 and FIG. 15 are diagrams showing the characteristics of a signal modulated according to a modulation technique according to one embodiment.

[0132] Figure 14 shows the phase difference according to the modulation technique and load according to one embodiment.

[0133] Load modulation can be a modulation method that modulates a signal by varying the load current. Inductive ASK modulation can be a modulation method that modulates a signal by varying the amplitude size using an inductor as a load.

[0134] The phase difference may refer to the phase difference between the phase of the signal applied to the transmitting coil and the modulated signal obtained based on the phase of the signal applied to the transmitting coil to transmit power to the electronic device. The control circuit of the external electronic device may obtain the phase difference between the signal applied to the transmitting coil of the external electronic device and the phase difference between the modulated signal applied to the receiving coil of the power transmitting device. For example, when the modulated signal is 0, a phase difference between the signal applied to the transmitting coil and the signal applied to the receiving coil may not occur. When the modulated signal is 1, a phase difference between the signal applied to the transmitting coil and the signal applied to the receiving coil may occur.

[0135] An external electronic device can demodulate the modulated signal based on the phase difference between the signal applied to the transmitting coil and the signal applied to the receiving coil.

[0136] The control circuit of the external electronic device can identify a phase difference between the signal applied to the transmitting coil and the signal applied to the receiving coil as 1, and a phase difference of no phase difference as 0. In this case, the greater the phase difference between the signal applied to the transmitting coil and the signal applied to the receiving coil, the greater the reliability and accuracy of the demodulated signal.

[0137] According to Figure 14, both the Load modulation technique and the Inductive ASK modulation technique can reduce the phase difference as the load resistance value decreases. The load resistance value can decrease as the amount of power transmitted from the external electronic device to the electronic device increases.

[0138] Meanwhile, the phase difference of the Inductive ASK modulation technique may be higher than that of the Load modulation technique. Furthermore, the phase difference of the Inductive ASK modulation technique under Heavy Load (10Ω) can be approximately 4.5°. Heavy Load (10Ω) can refer to a state in which the amount of power transmitted between an external electronic device and the electronic device increases as the amount of power required by the electronic device increases.

[0139] Figure 15 shows the amplitude difference according to the modulation technique and load according to one embodiment.

[0140] Load modulation technique and inductive ASK modulation technique can transmit a modulated signal to an external electronic device by controlling the amplitude of the voltage applied to the receiving coil (320).

[0141] The Load modulation technique can maintain the amplitude difference at approximately 2V regardless of the load resistance value. In addition, the Inductive ASK modulation technique can maintain the amplitude difference at approximately 2V regardless of the load resistance value. In other words, both the Load modulation technique and the Inductive ASK modulation technique can maintain a similar amplitude difference of approximately 2V regardless of the load.

[0142] In one embodiment of the electronic device as described above, the electronic device includes a coil configured to wirelessly receive AC power from an external electronic device, a rectifier circuit configured to rectify the AC power received through the coil and output DC power, an inductor, and a switch connected to the inductor, and a communication circuit configured to modulate the AC power according to an on / off state of the switch, wherein the communication circuit may include a synchronization data signal generation circuit configured to synchronize a data signal to transition at the center of a rectangular pulse of the AC power and to apply the synchronized data signal to the switch to control the on / off state of the switch. For example, the switch may be turned on in an on period of the synchronization data signal and turned off in an off period of the synchronization data signal, and the on time point of the synchronization data signal may correspond to the center of the rectangular pulse of the AC power.

[0143] For example, the synchronization data signal generation circuit may be configured to generate the synchronization data signal by synchronizing the on point of the data signal to the center of the rectangular pulse of the AC power.

[0144] For example, the synchronization data signal generating circuit may be configured to convert the AC power having the rectangular pulse into a triangular pulse signal, generate a signal corresponding to half of the peak voltage of the triangular pulse signal and the center of the rectangular pulse of the AC power based on the triangular pulse signal, and generate the synchronization data signal based on the generated signal and the data signal.

[0145] For example, the communication circuit may be configured to modulate the AC power using inductive ASK modulation.

[0146] For example, the switch may be a back to back switch and the frequency of the AC signal may be 360 ​​kHz.

[0147] A communication method of an electronic device including an inductor and a switch that is turned on / off based on a synchronization data signal according to one embodiment comprises: an operation of wirelessly receiving AC power for obtaining power from an external electronic device through a coil; an operation of applying a synchronization data signal that is shifted at the center of a square pulse of AC power to the switch; and

[0148] It may include an operation of modulating AC power according to the state of a switch that is turned on / off based on a synchronization data signal, and transmitting the modulated AC power to an external electronic device through a coil.

[0149] For example, the switch may be turned on in the on period of the synchronization data signal and turned off in the off period of the synchronization data signal, and the on point of the synchronization data signal may correspond to the center of a square pulse of the AC power signal.

[0150] For example, the communication method may further include an operation of generating the synchronization data signal by synchronizing the on time of the data signal to the center of the rectangular pulse of the AC power signal. For example, the generating operation may include an operation of converting the AC power signal having the rectangular pulse into a triangular pulse signal, an operation of generating a signal corresponding to the center of the rectangular pulse of the AC power signal based on half of the peak voltage of the triangular pulse signal and the triangular pulse signal, and an operation of generating the synchronization data signal based on the generated signal and the data signal.

[0151] For example, the AC power can be modulated based on inductive ASK modulation.

[0152] For example, the switch (223b) may be a back-to-back switch and the frequency of the AC signal may be 360 ​​kHz.

[0153] FIG. 16 is a flowchart illustrating an electronic device communication method according to one embodiment.

[0154] According to FIG. 16, an electronic device (202) may include an inductor and a switch that is turned on / off based on a synchronization data signal. The electronic device (202) may wirelessly receive AC power for obtaining power from an external electronic device through a coil (S1610). The electronic device (202) may apply a synchronization data signal that transitions at the center of a rectangular pulse of AC power to the switch (S1620). The electronic device (202) may modulate the synchronization data signal based on a current flowing through the inductor by the switch that is turned on / off based on the synchronization data signal (S1630), and may transmit the modulated synchronization data signal to the external electronic device through the coil (S1640).

[0155] The switch (326) is turned on in the on period of the synchronization data signal and turned off in the off period of the synchronization data signal, and the on point of the synchronization data can correspond to the center of the square pulse of the AC power.

[0156] The communication method of the electronic device (202) may further include an operation of generating a synchronization data signal by synchronizing the on point of the data signal to the center of the square pulse of the AC power.

[0157] The operation of generating a synchronization data signal comprises the operation of converting AC power having a rectangular pulse into a triangular pulse signal, the operation of generating a signal corresponding to the center of the rectangular pulse of the AC power based on half the peak voltage of the triangular pulse signal and the triangular pulse signal, and

[0158] It may include an operation of generating a synchronization data signal based on the generated signal and data signal.

[0159] The synchronization data signal can be modulated based on inductive ASK modulation.

[0160] The above switch is a back to back switch and the frequency of the AC signal can be 360 ​​kHz.

[0161] Although various embodiments have been described above, each embodiment is not necessarily implemented individually, and may be implemented together in a single product by being combined in whole or in part with at least one other embodiment.

[0162] Each of the components (e.g., modules or programs) according to the various embodiments described above may be composed of one or more entities, and some of the sub-components described above may be omitted, or other sub-components may be further included in various embodiments. Alternatively or additionally, some components (e.g., modules or programs) may be integrated into a single entity, which may perform the same or similar functions as those performed by each of the respective components prior to integration. Operations performed by modules, programs or other components according to various embodiments may be executed sequentially, in parallel, iteratively or heuristically, or at least some operations may be executed in a different order, omitted, or other operations may be added.

[0163] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present disclosure pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be understood individually from the technical idea of ​​the present disclosure.

Claims

1. In an electronic device (202), A coil (221L) configured to wirelessly receive AC power from an external electronic device (201); A rectifier circuit (221b) configured to rectify the AC power received through the coil (221L) and output DC power; and A communication circuit (223) including an inductor (223a) and a switch (223b) connected to the inductor, and configured to modulate the AC power according to the on / off state of the switch (223b); The above communication circuit (223) An electronic device (202) comprising a synchronization data signal generation circuit (223c) configured to synchronize a data signal to transition at the center of a square pulse of the AC power and to apply the synchronized data signal to the switch to control the on / off state of the switch.

2. In paragraph 1, The above switch (223b) is turned on in the on period of the synchronization data signal and turned off in the off period of the synchronization data signal. The on point of the above synchronization data signal corresponds to the center of the square pulse of the AC power, the electronic device (202).

3. In either paragraph 1 or paragraph 2, The above synchronization data signal generation circuit (223c) is An electronic device (202) configured to generate the synchronization data signal by synchronizing the on point of the data signal to the center of the rectangular pulse of the AC power.

4. In any one of paragraphs 1 to 3, The above synchronization data signal generation circuit (223c) is Converting the AC power having the above-mentioned square pulse into a triangular pulse signal, Generating a signal corresponding to half of the peak voltage of the triangular pulse signal and the center of the rectangular pulse of the AC power based on the triangular pulse signal, An electronic device (202) configured to generate the synchronization data signal based on the generated signal and the data signal.

5. In any one of paragraphs 1 to 4, The above communication circuit (223) is an electronic device (202) configured to modulate the synchronization data signal using inductive ASK modulation.

6. In any one of paragraphs 1 to 5, The above switch (223b) is An electronic device (202) which is a back to back switch.

7. In any one of paragraphs 1 to 6, Electronic device (202) wherein the frequency of the AC power is 360 kHz.

8. A communication method of an electronic device (202) including an inductor (223a) and a switch (223b) that is turned on / off based on a synchronization data signal, An operation of wirelessly receiving AC power through a coil (221L) to obtain power from an external electronic device (201); An operation of applying the synchronization data signal transitioning from the center of the square pulse of the AC power to the switch (223b); and A communication method comprising: an operation of modulating the AC power according to the state of a switch (223b) that is turned on / off based on the synchronization data signal, and transmitting the modulated AC power to the external electronic device (201) through the coil (221L); 9. In paragraph 8, The above switch (223b) is turned on in the on period of the synchronization data signal and turned off in the off period of the synchronization data signal. A communication method wherein the on point of the above synchronization data signal corresponds to the center of the square pulse of the AC power.

10. In either of paragraphs 8 or 9, A communication method further comprising: generating the synchronization data signal by synchronizing the on point of the data signal to the center of the rectangular pulse of the AC power; 11. In any one of paragraphs 8 to 10, The above generating action is, An operation of converting the AC power having the above-mentioned square pulse into a triangular pulse signal; An operation of generating a signal corresponding to half of the peak voltage of the triangular pulse signal and the center of the rectangular pulse of the AC power based on the triangular pulse signal; and A communication method, comprising: an operation of generating the synchronization data signal based on the generated signal and the data signal; 12. In any one of paragraphs 8 to 11, A communication method wherein the above synchronization data signal is modulated based on inductive ASK modulation.

13. In any one of paragraphs 8 to 12, The above switch (223b) is A communication method that is a back-to-back switch.

14. In any one of paragraphs 8 to 13, A communication method wherein the frequency of the above AC power is 360 kHz.

Images