Power reception device and method to control charging of power reception device

Abstract

The apparatus comprises a power receiver, a communication circuit, a modulation depth monitoring circuit, and a processor electrically connected to the power receiver, the communication circuit, and the modulation depth monitoring circuit, wherein the power receiver includes a receiving circuit that receives power from a wireless power transmitter and includes a coil and a first capacitor, and a rectifying circuit that rectifies the power received from the receiving circuit and converts it into DC power, and the communication circuit includes a plurality of detuning switching units that include a second capacitor and a switch and change the voltage of the power received by the coil, and a modulation circuit for turning the switch on or off based on a control signal received from the processor, and the modulation depth monitoring circuit monitors the voltage of the rectified DC power to measure the modulation depth and provides it to the processor, and the processor identifies a detuning switching unit among the plurality of detuning switching units to perform data modulation based on the modulation depth, and controls the modulation circuit so that data is modulated through the identified detuning switching unit to limit the modulation depth so that the modulation depth falls within a specified range, and the A power receiving device is disclosed that controls the modulation circuit based on the data to be transmitted to a wireless power transmitter. In addition to this, various embodiments identified through the specification are possible.

Description

Technology Field

[0001] The various embodiments disclosed in this document relate to a power receiving device and a method for controlling the charging of the power receiving device. Background Technology

[0002] The electronic device can be charged by connecting it to a charging device. In this document, the electronic device may be collectively referred to as a power receiving device. In this document, the charging device may be collectively referred to as a power transmitting device. The power transmitting device can wirelessly transmit power to the power receiving device. The power receiving device can receive power from the power transmitting device. The power receiving device and the power transmitting device can constitute a wireless charging system established as an international standard by the Wireless Power Consortium (WPC).

[0003] The power receiving device and power transmitting device included in the wireless charging system established as an international standard by the WPC can perform in-band communication to transmit and receive power wirelessly. When performing in-band communication, the power receiving device can vary the capacitance value of the capacitor placed in front of the rectifier. The power receiving device can modulate the signal for in-band communication by varying the capacitance value of the capacitor placed in front of the rectifier. The problem to be solved

[0004] When performing in-band communication, the power receiving device may close or open a switch connected to a capacitor to vary the capacitance value of the capacitor placed in front of the rectifier. When the switch connected to the capacitor is closed, signal modulation may be enabled. When the switch connected to the capacitor is opened, signal modulation may be disabled.

[0005] The capacitance value of the capacitor placed in front of the rectifier can be predetermined. The rectified voltage of the electronic device may change when the switch connected to the capacitor is closed or opened. The rectified voltage of the electronic device may change when signal modulation is enabled and when signal modulation is disabled.

[0006] The difference between the magnitude of the rectified voltage of an electronic device when signal modulation is enabled and the magnitude of the rectified voltage of an electronic device when signal modulation is disabled can be collectively referred to as the modulation depth. When the modulation depth increases, audible noise may occur when modulating the signal.

[0007] The various embodiments disclosed in this document aim to provide a method for reducing audible noise generated when modulating a signal while charging a power receiving device wirelessly, and an electronic device to which the method is applied. means of solving the problem

[0008] A power receiving device according to one embodiment disclosed in this document comprises a power receiving unit, a communication circuit, a modulation depth monitoring circuit, and a processor electrically connected to the power receiving unit, the communication circuit, and the modulation depth monitoring circuit. The power receiving unit includes a receiving circuit that receives power from a wireless power transmitter and includes a coil and a first capacitor, and a rectifying circuit that rectifies the power received from the receiving circuit and converts it into DC power. The communication circuit includes a plurality of detuning switching units that change the voltage of the power received by the coil and include a second capacitor and a switch, and a modulation circuit for turning the switch on or off based on a control signal received from the processor. The modulation depth monitoring circuit monitors the voltage of the rectified DC power to measure the modulation depth and provides it to the processor. The processor identifies a detuning switching unit among the plurality of detuning switching units to perform data modulation based on the modulation depth, and controls the modulation circuit so that data is modulated through the identified detuning switching unit, thereby specifying the modulation depth. The modulation depth can be limited to fall within a range, and the modulation circuit can be controlled based on the data to be transmitted to the wireless power transmitter.

[0009] Additionally, a method for controlling the charging of a power receiving device according to an embodiment disclosed in this document may include: receiving power from a wireless power transmitter; rectifying the received power to convert it into DC power; monitoring the voltage of the rectified DC power to measure the modulation depth; identifying a detuning switching unit to perform data modulation based on the modulation depth; controlling a modulation circuit to modulate data through the identified detuning switching unit to limit the modulation depth so that the modulation depth falls within a specified range; and controlling the modulation circuit based on the data to be transmitted to the wireless power transmitter. Effects of the invention

[0010] According to the various embodiments disclosed in this document, when a power receiving device modulates a signal for in-band communication, the modulation depth can be limited to within a specified range. Accordingly, audible noise generated when modulating the signal can be reduced.

[0011] In addition, according to the various embodiments disclosed in this document, audible noise can be reduced as the maximum threshold value of a specified range limiting the modulation depth is set lower.

[0012] In addition, various effects that can be identified directly or indirectly through this document may be provided. Brief explanation of the drawing

[0013] FIG. 1 is a block diagram of an electronic device in 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 block diagram showing a system including a power transmitting device and a power receiving device according to one embodiment. Figure 4 is a diagram showing in-band communication of a wireless charging system established as an international standard by WPC. Figure 5 is a diagram showing a wireless charging system established as an international standard by the WPC. FIG. 6a is a block diagram showing a power receiving device according to one embodiment. FIG. 6b is a block diagram showing a power receiving device according to another embodiment. FIG. 6c is a flowchart illustrating a method for controlling the charging of a power receiving device according to one embodiment. FIG. 7 is a table showing a modulation control table according to one embodiment. FIG. 8 is a graph showing the calculation of the average value of the modulation depth according to one embodiment. FIG. 9 is a graph showing the calculation of the average value of the modulation depth according to another embodiment. FIG. 10a is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 10b is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 10c is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 10d is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 11a is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 11b is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 11c is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 11d is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 12 is a flowchart illustrating a method for controlling modulation depth according to one embodiment. In relation to the description of the drawings, the same or similar reference numerals may be used for identical or similar components. Specific details for implementing the invention

[0014] Hereinafter, various embodiments of the present invention are described with reference to the accompanying drawings. However, this is not intended to limit the present invention to specific embodiments and should be understood to include various modifications, equivalents, and / or alternatives of the embodiments of the present invention.

[0016] FIG. 1 is a block diagram of an electronic device (101) in a network environment (100) according to various embodiments. Referring to FIG. 1, in the network environment (100), the electronic device (101) may communicate with an electronic device (102) through a first network (198) (e.g., a short-range wireless communication network) or 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 a server (108). According to one embodiment, the electronic device (101) may include a processor (120), memory (130), input module (150), sound output module (155), display module (160), audio module (170), sensor module (176), interface (177), connection terminal (178), haptic module (179), camera module (180), power management module (188), battery (189), communication module (190), subscriber identification module (196), or antenna module (197). In some embodiments, at least one of these components (e.g., connection terminal (178)) may be omitted from the electronic device (101), or one or more other components may be added. In some embodiments, some of these components (e.g., sensor module (176), camera module (180), or antenna module (197)) may be integrated into a single component (e.g., display module (160)).

[0017] The processor (120) can control at least one other component (e.g., hardware or software component) of the electronic device (101) connected to the processor (120) by executing software (e.g., program (140)), for example, and can perform various data processing or operations. According to one embodiment, as at least part of the data processing or operations, the processor (120) can store commands or data received from other components (e.g., sensor module (176) or communication module (190)) in volatile memory (132), process the commands or data stored in volatile memory (132), and store the resulting data in non-volatile memory (134). According to one embodiment, the processor (120) may include a main processor (121) (e.g., central processing unit or application processor) or an auxiliary processor (123) that can operate independently or together with it (e.g., graphics processing unit, neural processing unit (NPU), image signal processor, sensor hub processor, or communication processor). For example, if the electronic device (101) includes a main processor (121) and an 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 designated function. The auxiliary processor (123) may be implemented separately from the main processor (121) or as part thereof.

[0018] The auxiliary processor (123) may control at least some of the functions or states associated with at least one component of the electronic device (101) (e.g., display module (160), sensor module (176), or communication module (190)) 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., image signal processor or communication processor) may be implemented as part of another functionally related component (e.g., camera module (180) or communication module (190)). According to one embodiment, the auxiliary processor (123) (e.g., neural network processing unit) may include a hardware structure specialized for processing an artificial intelligence model. The artificial intelligence model may be generated through machine learning. Such learning may be performed, for example, on the electronic device (101) itself where the artificial intelligence is performed, or through a separate server (e.g., server (108)). The learning algorithm may 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 may include a plurality of artificial neural network layers.An artificial neural network may be a deep neural network (DNN), a convolutional neural network (CNN), a recurrent neural network (RNN), a restricted Boltzmann machine (RBM), a deep belief network (DBN), a bidirectional recurrent deep neural network (BRDNN), 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 the hardware structure, the artificial intelligence model may include a software structure, either additionally or substantially.

[0019] The memory (130) can store various data used by at least one component of the electronic device (101) (e.g., processor (120) or sensor module (176)). The data may include, for example, input data or output data for software (e.g., program (140)) and related commands. The memory (130) may include volatile memory (132) or non-volatile memory (134).

[0020] 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).

[0021] The input module (150) can receive commands or data to be used for a component of the electronic device (101) (e.g., processor (120)) from outside the electronic device (101) (e.g., user). The input module (150) may include, for example, a microphone, a mouse, a keyboard, a key (e.g., a button), or a digital pen (e.g., a stylus pen).

[0022] The sound output module (155) can output a sound signal to the outside of the electronic device (101). The sound output module (155) may include, for example, a speaker or a receiver. The speaker may be used for general purposes, such as multimedia playback or recording playback. The receiver may be used to receive incoming calls. According to one embodiment, the receiver may be implemented separately from the speaker or as part thereof.

[0023] The display module (160) can visually provide information to an external (e.g., 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 said 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 the force generated by said touch.

[0024] The audio module (170) can convert sound into an electrical signal or, conversely, convert an electrical signal into sound. According to one embodiment, the audio module (170) can acquire sound through the input module (150) or output sound through the sound output module (155) or an external electronic device (e.g., electronic device (102)) (e.g., speaker or headphones) connected directly or wirelessly to the electronic device (101).

[0025] The sensor module (176) can detect the operating state of the electronic device (101) (e.g., power or temperature) or the external environmental state (e.g., user state) and generate an electrical signal or data value corresponding to the detected state. According to one embodiment, the sensor module (176) may include, for example, a gesture sensor, a gyroscope sensor, a barometric pressure sensor, a magnetic sensor, an accelerometer sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biosensor, a temperature sensor, a humidity sensor, or an illuminance sensor.

[0026] The interface (177) may support one or more specified protocols that can be used for the electronic device (101) to be connected directly or wirelessly to an external electronic device (e.g., electronic device (102)). According to 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.

[0027] The connection terminal (178) may include a connector through which the electronic device (101) can 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).

[0028] The haptic module (179) can convert an electrical signal into a mechanical stimulus (e.g., vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic senses. According to one embodiment, the haptic module (179) may include, for example, a motor, a piezoelectric element, or an electric stimulation device.

[0029] The camera module (180) can capture still images and video. According to one embodiment, the camera module (180) may include one or more lenses, image sensors, image signal processors, or flashes.

[0030] The power management module (188) can manage the power supplied to the electronic device (101). According to one embodiment, the power management module (188) can be implemented, for example, as at least part of a power management integrated circuit (PMIC).

[0031] The battery (189) can supply power to at least one component of the electronic device (101). According to one embodiment, the battery (189) may include, for example, a non-rechargeable primary battery, a rechargeable secondary battery, or a fuel cell.

[0032] The communication module (190) can support the establishment of a direct (e.g., wired) communication channel or a wireless communication channel between an 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 include one or more communication processors that operate independently of the processor (120) (e.g., application processor) and 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., cellular communication module, short-range wireless communication module, or GNSS (global navigation satellite system) communication module) or a wired communication module (194) (e.g., LAN (local area network) communication module, or power line communication module). The corresponding communication module among these communication modules can communicate with an external electronic device (104) through a first network (198) (e.g., a short-range communication network such as Bluetooth, WiFi (wireless fidelity) direct, or IrDA (infrared data association)) or a second network (199) (e.g., 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 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) can identify or authenticate the electronic device (101) within a communication network such as the first network (198) or the second network (199) using subscriber information (e.g., International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module (196).

[0033] The wireless communication module (192) can support 5G networks and next-generation communication technologies following 4G networks, for example, new radio access technology. NR access technology can support high-speed transmission of high-capacity data (enhanced mobile broadband (eMBB)), minimization of terminal power and connection of multiple terminals (massive machine type communications (mMTC)), or high reliability and low latency (ultra-reliable and low-latency communications (URLLC)). The wireless communication module (192) can support a high-frequency band (e.g., mmWave band) to achieve a high data transmission rate, for example. The wireless communication module (192) can support various technologies for securing performance in the high-frequency band, such as beamforming, massive MIMO (multiple-input and multiple-output), 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), external electronic device (e.g., electronic device (104)), or network system (e.g., 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 realizing eMBB, loss coverage (e.g., 164 dB or less) for realizing mMTC, or U-plane latency (e.g., downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less) for realizing URLLC.

[0034] An antenna module (197) can transmit a signal or power to or from an external source (e.g., an external electronic device). According to one embodiment, the antenna module (197) may include an antenna comprising a radiator made of a conductor or a conductive pattern formed on a substrate (e.g., a PCB). According to 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 a first network (198) or a second network (199), may be selected from the plurality of antennas, for example, by a communication module (190). A signal or power may be transmitted or received between the communication module (190) and an external electronic device through the selected at least one antenna. According to some embodiments, in addition to the radiator, other components (e.g., a radio frequency integrated circuit (RFIC)) may be additionally formed as part of the antenna module (197).

[0035] According to various embodiments, the antenna module (197) may form a mmWave antenna module. According to one embodiment, the mmWave antenna module may include a printed circuit board, an RFIC disposed on or adjacent to a first surface (e.g., bottom surface) of the printed circuit board and capable of supporting a specified high frequency band (e.g., mmWave band), and a plurality of antennas (e.g., array antennas) disposed on or adjacent to a second surface (e.g., top surface or side surface) of the printed circuit board and capable of transmitting or receiving a signal of the specified high frequency band.

[0036] At least some of the above components can be connected to each other via a communication method between peripheral devices (e.g., bus, GPIO (general purpose input and output), SPI (serial peripheral interface), or MIPI (mobile industry processor interface)) and exchange signals (e.g., commands or data) with each other.

[0037] According to one embodiment, commands or data may be transmitted or received between the electronic device (101) and an external electronic device (104) through a server (108) connected to a second network (199). Each of the external electronic devices (102, or 104) may be the same or different type of device as the electronic device (101). According to one embodiment, all or part of the operations performed on the electronic device (101) may be performed on one or more of the external electronic devices (102, 104, or 108). For example, if the electronic device (101) needs to perform a function or service automatically or in response to a request from a user or another device, the electronic device (101) may request one or more external electronic devices to perform at least part of the function or service instead of performing the function or service itself or additionally. One or more external electronic devices that receive the above request may execute at least part of the requested function or service, or 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 provide the result as is or additionally processed as at least part of the response to the request. For this purpose, for example, cloud computing, distributed computing, mobile edge computing (MEC), or client-server computing technology may be used. The electronic device (101) may provide ultra-low latency services using, for example, distributed computing or mobile edge computing. In another embodiment, the external electronic device (104) may include an Internet of Things (IoT) device. The server (108) may be an intelligent server using machine learning and / or neural networks. According to one embodiment, the external electronic device (104) or the server (108) may be included within a 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.

[0039] 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 fast charging) based on at least some of the type of 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 attributes of the battery (189), and may charge the battery (189) using the selected charging method. The external power source can be wired to the electronic device (101), for example, through a connection terminal (178), or wirelessly through an antenna module (197).

[0040] The power regulator (220) can generate multiple powers having different voltage or different current levels by adjusting the voltage level or current level of the power supplied from, for example, an external power source or a battery (189). The power regulator (220) can adjust the power of the external power source or 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) may be implemented in the form of a low drop-out (LDO) regulator or a switching regulator. The power gauge (230) can measure usage status information for the battery (189) (e.g., capacity of the battery (189), number of charge / discharge cycles, voltage, or temperature).

[0041] The power management module (188) can determine charge state information related to the charging of the battery (189) (e.g., lifespan, overvoltage, undervoltage, overcurrent, overcharge, overdischarge, overheating, short circuit, or swelling) based at least part of the measured usage state information, using, for example, a charging circuit (210), a voltage regulator (220), or a power gauge (230). The power management module (188) can determine whether the battery (189) is normal or abnormal based at least part of the determined charge state information. If the state of the battery (189) is determined to be abnormal, the power management module (188) can adjust the charging of the battery (189) (e.g., reducing the charging current or voltage, or stopping the charging). According to one embodiment, at least some of the functions of the power management module (188) may be performed by an external control device (e.g., a processor (120)).

[0042] According to one embodiment, the battery (189) may 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-shutdown function) to prevent performance degradation or burnout of the battery (189). The battery protection circuit (240) may additionally or substantially be configured as at least part of a battery management system (BMS) capable of performing various functions including cell balancing, measuring battery capacity, measuring charge / discharge cycles, measuring temperature, or measuring voltage.

[0043] According to one embodiment, at least a portion of the usage status information or charge status information of the battery (189) may be measured using a corresponding sensor (e.g., 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., temperature sensor) among the sensor modules (176) may be included as part of the battery protection circuit (140) or may be placed near the battery (189) as a separate device.

[0045] FIG. 3 is a block diagram showing a system (300) including a power transmitting device (310) and a power receiving device (320) according to one embodiment. FIG. 3 illustrates a case where power is transmitted in an inductive manner. However, it is not limited thereto, and the system (300) according to the present invention may also be applied to a case where power is transmitted in a resonant manner.

[0046] In one embodiment, the power transmitting device (310) may be a power supply or a charging device. The power receiving device (320) may be an electronic device (e.g., the electronic device (101) of FIG. 1). For example, the power receiving device (320) may be a portable electronic device or a wearable electronic device. The power transmitting device (310) may wirelessly transmit power to the power receiving device (320). The power receiving device (320) may be wirelessly charged by the power transmitting device (310). In one embodiment, the power transmitting device (310) may be a portable electronic device or a wearable electronic device similar to the power receiving device (320).

[0047] In one embodiment, the power transmission device (310) may include a power supply unit (311), a converter (312), an inverter (313), a first matching unit (314), a transmission coil (315), a control unit (316), and a first communication circuit (317).

[0048] In one embodiment, the power supply unit (311) may receive power from an external source. The power supply unit (311) may transmit an input voltage (Vin) and an input current (Iin) to the converter (312).

[0049] In one embodiment, the converter (312) may receive an input voltage (Vin) and an input current (Iin) from the power supply (311). The converter (312) may generate an inverter voltage (Vinv) and an inverter current (Iinv) based on the input voltage (Vin) and the input current (Iin). The converter (312) may transmit the inverter voltage (Vinv) and the inverter current (Iinv) to the inverter (313). The converter (312) may be a DC-DC converter.

[0050] In one embodiment, the inverter (313) may receive the inverter voltage (Vinv) and inverter current (Iinv) from the converter (312). The inverter (313) may invert the inverter voltage (Vinv) and inverter current (Iinv) and transmit them to the first matching unit (314). The inverter (313) may further include a power amplifier (PA) or be replaced by a power amplifier.

[0051] In one embodiment, the first matching unit (314) may receive the inverter voltage (Vinv) and inverter current (Iinv) from the inverter (313). The inverter (313) may output the inverter voltage (Vinv) and inverter current (Iinv) converted into alternating current (AC). The first matching unit (314) may transmit the inverter voltage (Vinv) and inverter current (Iinv) converted into alternating current (AC) to the transmitting coil (315). The first matching unit (314) may compensate for or adjust the input impedance of the transmitting end of the transmitting coil (315). The first matching unit (314) may be an impedance matching network (IMN).

[0052] In one embodiment, the transmitting coil (315) may receive the inverted inverter voltage (Vinv) and inverter current (Iinv) from the first matching unit (314). The transmitting coil (315) may transmit power wirelessly based on the inverted inverter voltage (Vinv) and inverter current (Iinv).

[0053] In one embodiment, the control unit (316) can control the duty of the converter (312). The duty may refer to the ratio of the length of the time that is turned on during a switching operation that controls the turn-on and turn-off of the converter (312) during a specified time interval. By changing the duty, the magnitude of the inverter voltage (Vinv) or the ratio of the magnitude of the inverter voltage (Vinv) compared with the input voltage (Vin) can be controlled. The duty may be referred to as a duty cycle or a duty ratio. The control unit (316) can control the frequency of the inverter (313). The frequency of the inverter (313) may be the operating frequency of the power transmission device (310). By changing the operating frequency, the input impedance of the system (300) can be changed. Accordingly, the operating frequency can be changed to control the inverter current (Iinv) output from the inverter (313) and the inverter power (Pinv) output from the inverter (313). The control unit (316) may be a microprocessor.

[0054] In one embodiment, the first communication circuit (317) can perform wireless communication with the second communication circuit (325) of the power receiving device (320). The first communication circuit (317) can receive information related to the charging status of the power receiving device (320). The first communication circuit (317) can receive information related to the voltage, current, and / or power of the power receiving device (320). The first communication circuit (317) can transmit information related to the voltage, current, and / or power of the power receiving device (320) to the control unit (316).

[0055] In one embodiment, the power receiving device (320) may include a processor (120), a receiving coil (321), a second matching unit (322), a rectifier (323), a regulator (324), a battery (189), a second communication circuit (325) (e.g., the wireless communication module (192) of FIG. 1), and a sensing circuit (326).

[0056] In one embodiment, the receiving coil (321) can receive power transmitted wirelessly from the transmitting coil (315). The receiving coil (321) can transmit the received power to the second matching unit (322).

[0057] In one embodiment, the second matching unit (322) may receive power from the receiving coil (321). The second matching unit (322) may transfer power to a rectifier (323). The second matching unit (322) may adjust or compensate for the input impedance visible from the receiving coil (321) of the power receiving device (320) to the load terminal (e.g., battery (189)). The second matching unit (322) may be an impedance matching network.

[0058] In one embodiment, the rectifier (323) may receive power from the second matching unit (322). The rectifier (323) may generate a rectified voltage (Vrect) and a rectified current (Irect) based on the received power. The rectifier (323) may transmit the rectified voltage (Vrect) and the rectified current (Irect) to the regulator (324).

[0059] In one embodiment, the regulator (324) may receive a rectified voltage (Vrect) and a rectified current (Irect) from the rectifier (323). The regulator (324) may generate an output voltage (Vout) and an output current (Iout) based on the received rectified voltage (Vrect) and rectified current (Irect). The regulator (324) may charge the battery (189) by delivering the output voltage (Vout) and the output current (Iout) to the battery (189). The battery (189) may serve as a load.

[0060] In one embodiment, the second communication circuit (325) can receive data regarding the rectified voltage (Vrect), rectified current (Irect), output voltage (Vout), and output current (Iout). The second communication circuit (325) can perform wireless communication with the power transmission device (310).

[0061] In one embodiment, the wireless communication performed by the power receiving device (320) and the power transmitting device (310) may be in-band or out-of-band communication. According to various embodiments, when the power receiving device (320) uses in-band communication, it may send a data signal embedded in a power signal. When the power receiving device (320) uses in-band communication, the second communication circuit (325) may communicate with the power transmitting device (310) using a frequency that is the same as or adjacent to the frequency used by the power transmitting device (310) for power transmission. For example, among international standard specifications, the Wireless Power Consortium (WPC) may transmit power using a frequency band of about 100 kHz or more to about 200 kHz or less, and communicate using a modulation signal of about 1.5 kHz or more to about 2.5 kHz or less. Data (or communication signals) generated by the second communication circuit (325) can be transmitted using the receiving coil (321). The second communication circuit (325) can transmit data to the power transmitting device (310) using an ASK (amplitude shift keying) or FSK (frequency shift keying) modulation technique. For example, in the WPC among international standards, data can be transmitted from the power receiving device (320) to the power transmitting device (310) using an ASK method based on load modulation. As another example, the second communication circuit (325) can communicate with the power transmitting device (310) by changing the frequency of the power signal transmitted through the receiving coil (321). Specifically, the second communication circuit (325) can express data by raising or lowering the frequency of the power receiving signal.

[0062] According to various embodiments, when the power receiving device (320) uses out-of-band communication, the second communication circuit (325) may communicate with the first communication circuit (317) of the power transmitting device (310) using a frequency different from the frequency used for power transmission in the power transmitting device (310). For example, the communication circuit (325) may obtain information related to the charging state (e.g., voltage value after rectifier, rectified voltage value (e.g., Vrect) information, current flowing from the receiving coil (321) or rectifier (323), various packets, and / or messages) from the first communication circuit (317) using any one of various short-range communication methods such as Bluetooth, BLE (Bluetooth low energy), Wi-Fi, and / or NFC (near field communication). The second communication circuit (325) can transmit data regarding the rectified voltage (Vrect), rectified current (Irect), output voltage (Vout), and output current (Iout) to the first communication circuit (317) via wireless communication.

[0063] In one embodiment, the sensing circuit (326) can detect an input voltage (Vin), an input current (Iin), an inverter voltage (Vinv), an inverter current (Iinv), a rectified voltage (Vrect), a rectified current (Irect), an output voltage (Vout), and an output current (Iout). The sensing circuit (326) can transmit the detected input voltage (Vin) and input current (Iin) to a control unit (316) or a micro controller unit (MCU).

[0064] In one embodiment, a control unit (316) or MCU that receives input voltage (Vin) and input current (Iin) can calculate the transmission power of the power transmission device (310). For example, the control unit (316) or MCU can calculate the transmission power of the power transmission device (310) by multiplying the value of the input voltage (Vin) and the value of the input current (Iin). A sensing circuit (326) can transmit a signal containing data regarding output voltage (Vout) and output current (Iout) to the control unit (316) or MCU. The control unit (316) or MCU can calculate the reception power of the power reception device (320) by demodulating the signal. The control unit (316) or MCU can measure the power transmission efficiency of the system (300) by calculating the ratio of the transmission power and the reception power.

[0066] Figure 4 is a diagram (400) showing in-band communication of a wireless charging system set as an international standard by WPC.

[0067] The power receiving device (320) of the wireless charging system set to an international standard can control the capacitance value of the line transmitting alternating current power within the power receiving device (320) to perform in-band communication in the wireless charging system. A capacitor (421) may be placed in the line transmitting alternating current power within the power receiving device (320).

[0068] A power receiving device (320) of a wireless charging system configured according to international standards can change the voltage of the transmitting coil (315) of a power transmitting device (310) by changing the capacitance value of the line transmitting AC power. For example, the power receiving device (320) can perform the operation of turning on and off a switch (422) connected to a capacitor (421). The power receiving device (320) can change the capacitance value of the line transmitting AC power by turning on and off the switch (422). As another example, the capacitor (421) of the power receiving device (320) may be a variable capacitor capable of changing the capacitance value. The power receiving device (320) can change the voltage of the transmitting coil (315) of the power transmitting device (310) by changing the capacitance value of the line transmitting AC power.

[0069] A power receiving device (320) of a wireless charging system configured according to international standards can transmit a signal (423) to a power transmitting device (310). The modulation unit (420) of the power receiving device (320) can transmit the signal (423) by modulating it into a binary code. For example, the signal (423) can be modulated using a clock of approximately 2KHz. The signal (423) may include information related to changes in the voltage and capacitance values ​​of the load of the power receiving device (320) measured by the power receiving device (320). The power transmitting device (310) can detect the signal (423) from the transmitting coil (315). The demodulation unit (430) of the power transmitting device (310) can demodulate the signal (423). The power transmission device (310) can control the power control unit (410) according to changes in the voltage and capacitance values ​​of the load of the power receiving device (320) included in the signal (423). The power transmission device (310) can perform a power transmission operation requested by the power receiving device (320).

[0071] Figure 5 is a drawing (500) showing a wireless charging system established as an international standard by WPC.

[0072] The modulation section (420) of the power receiving device (320) of the wireless charging system established as an international standard by WPC may include a modulation circuit (520). The modulation circuit (520) can measure the rectified voltage (e.g., Vrect in FIG. 3) supplied to the regulator (324) at the measurement point (521). The rectified voltage may refer to a DC voltage converted through a rectification stage from an AC voltage received from a coil (e.g., receiving coil (321) in FIG. 3) at the receiver. The modulation circuit (520) can compare the rectified voltage with a target rectified voltage. The modulation circuit (520) may be connected to lines that transmit AC power.

[0073] Modulation capacitors (531, 532, 533, 534) may be placed in each of the lines transmitting AC power of a wireless charging system established as an international standard by WPC. The modulation capacitors (531, 532, 533, 534) may be connected in parallel with each other. The modulation capacitors (531, 532, 533, 534) may change the capacitance value of the lines transmitting AC power. For example, each of the modulation capacitors (531, 532, 533, 534) may be connected to switches (535, 536, 537, 538). The rectified voltage that changes due to the operation of the switches (535, 536, 537, 538) may be defined as the modulation voltage. Each of the switches (535, 536, 537, 538) can be implemented as a MOSFET. The modulation capacitors (531, 532, 533, 534) and the switches (535, 536, 537, 538) can form a capacitor switch network.

[0074] In one embodiment, each of the switches (535, 536, 537, 538) included in the capacitor switch network can be turned on or off according to a control signal to change the connection state between the modulation circuit (520) and the modulation capacitors (531, 532, 533, 534). As each of the switches (535, 536, 537, 538) is turned on or off, the capacitance value of the lines transmitting AC power can be changed. As another example, each of the modulation capacitors (531, 532, 533, 534) can be made of a variable capacitor. If each of the modulation capacitors (531, 532, 533, 534) is a variable capacitor, the capacitance value of each of the modulation capacitors (531, 532, 533, 534) can be changed according to the control of the MCU (micro controller unit) of the power receiving device (320) (e.g., the processor (120) of FIG. 3).

[0075] When modulating a signal for in-band communication, the rectified voltage may change if the capacitance value formed by the modulation capacitors (531, 532, 533, 534) changes. The change in rectified voltage may be determined by at least one of the following factors: the characteristics of the transmitting coil (315) of the power transmitting device (310), the characteristics of the receiving coil (321) of the power receiving device (320), the change in correlation according to the alignment of the transmitting coil (315) and the receiving coil (321), the resonance setting of the transmitting coil (315) and the receiving coil (321), the output current of the power receiving device (320) (e.g., output current (Iout) of FIG. 3), and the inverter voltage of the inverter (e.g., inverter (313) of FIG. 3) of the power transmitting device (310) (e.g., inverter voltage (Vinv) of FIG. 3).

[0077] FIG. 6a is a block diagram showing a power receiving device (320) according to one embodiment. The power receiving device (320) may include a power receiving unit (610), a communication circuit (620) (e.g., the second communication circuit (325) of FIG. 3), a modulation depth monitoring circuit (630), and a processor (120).

[0078] In one embodiment, the power receiving unit (610) may receive power from a wireless power transmitter (e.g., the power transmitting device (310) of FIGS. 3 to 5) and rectify the received power to convert it into DC power. The power receiving unit (610) may include a receiving circuit (611) and a rectifying circuit (612) (e.g., the rectifier (323) of FIG. 3).

[0079] In one embodiment, the receiving circuit (611) can receive power from the wireless power transmitter (310). The receiving circuit (611) may include a coil (e.g., the receiving coil (321) of FIG. 3) and a first capacitor (e.g., the second matching part (322) of FIG. 3). The coil (321) can receive power wirelessly. The first capacitor can match the input impedance and internal impedance of the receiving circuit (611).

[0080] In one embodiment, the rectifier circuit (612) can rectify the power received from the receiving circuit (611). The rectifier circuit (612) can convert the power received from the receiving circuit (611) into direct current power.

[0081] In one embodiment, the communication circuit (620) can perform modulation to change the voltage of the power received by the coil (321). The communication circuit (620) can turn the modulation on or off based on a received control signal. The communication circuit (620) may include a first detuning switching unit (621), a second detuning switching unit (622), and a modulation circuit (623). FIG. 6a illustrates a case where two detuning switching units (621, 622) exist. However, it is not limited thereto, and the communication circuit (620) may include a plurality of detuning switching units (621, 622).

[0082] In one embodiment, the first detuning switching unit (621) and the second detuning switching unit (622) may each include a second capacitor and a switch. The first detuning switching unit (621) and the second detuning switching unit (622) may each change the voltage of the power received by the coil (321).

[0083] In one embodiment, the modulation circuit (623) can turn the switch on or off based on a control signal received from the processor (120).

[0084] In one embodiment, the modulation depth monitoring circuit (630) can monitor the rectified DC power. The modulation depth monitoring circuit (630) can monitor the voltage of the rectified DC power. The modulation depth monitoring circuit (630) can measure the modulation depth based on the monitored voltage. The modulation depth monitoring circuit (630) can provide the measured modulation depth to the processor (120).

[0085] In one embodiment, the processor (120) may receive a modulation depth from a modulation depth monitoring circuit (630). Based on the modulation depth, the processor (120) may identify a detuning switching unit among a plurality of detuning switching units (621, 622) to perform data modulation. For example, if the modulation depth corresponds to a modulation depth range that utilizes the first detuning switching unit (621), the processor (120) may determine the first detuning switching unit (621) as the detuning switching unit to perform data modulation.

[0086] In one embodiment, the processor (120) can control the modulation circuit (623) so that data is modulated through the identified detuning switching unit. The processor (120) can limit the modulation depth so that the modulation depth falls within a specified range. The processor (120) can transmit a control signal to the modulation circuit (623). The control signal can turn on or off the switch of each of the plurality of detuning switching units (621, 622). For example, if the first detuning switching unit (621) is determined to be the detuning switching unit to perform data modulation, the processor (120) can transmit a control signal to the modulation circuit (623) to turn on the switch of the first detuning switching unit (621) and turn off the switch of the second detuning switching unit (622).

[0087] In one embodiment, the processor (120) can control the modulation circuit (623) based on data to be transmitted to the wireless power transmitter (310).

[0089] FIG. 6b is a block diagram showing a power receiving device (320) according to another embodiment. The power receiving device (320) may include a power receiving unit (610), a communication circuit (620), a voltage sensing circuit (640), and a processor (120). The power receiving unit (610) and the communication circuit (620) of the power receiving device (320) according to FIG. 6b may be substantially the same as the power receiving unit (610) and the communication circuit (620) of the power receiving device (320) according to FIG. 6a.

[0090] In one embodiment, the voltage sensing circuit (640) can sense the DC power rectified by the rectifier circuit (612). The voltage sensing circuit (640) can sense the voltage of the rectified DC power. The voltage sensing circuit (640) can provide the sensed voltage information to the processor (120).

[0091] In one embodiment, the processor (120) can receive voltage information sensed by the voltage sensing circuit (640). The processor (120) can calculate the modulation depth based on the received voltage information. Based on the modulation depth, the processor (120) can identify a detuning switching unit among a plurality of detuning switching units (621, 622) to perform data modulation. The processor (120) can control the modulation circuit (623) so that data is modulated through the identified detuning switching unit. The processor (120) can limit the modulation depth so that the modulation depth falls within a specified range.

[0093] FIG. 6c is a flowchart illustrating a method for controlling the charging of a power receiving device (320) according to one embodiment.

[0094] A power receiving device (320) according to one embodiment can receive power from a wireless power transmitter (e.g., a power transmitting device (310) of FIGS. 3 to 5) in operation 691.

[0095] A power receiving device (320) according to one embodiment can rectify the received power and convert it into direct current power in operation 692.

[0096] In one embodiment, the power receiving device (320) can perform in-band communication to modulate the switching circuit. For example, the switching circuit may include switches included in the capacitor switch network shown in FIG. 5. The processor (120) of the power receiving device (320) can open or close the switches included in the switching circuit. As another example, if the modulation capacitors (531, 532, 533, 534) included in the capacitor switch network shown in FIG. 5 are variable capacitors, the switching circuit can change the capacitance value of the variable capacitor. The processor (120) of the power receiving device (320) can control the switching circuit to change the capacitance value of the variable capacitor. The switching circuit can modulate a signal for in-band communication by varying the capacitance value of the front end of the rectifier (e.g., the rectifier (323) of FIG. 3).

[0097] A power receiving device (320) according to one embodiment can measure the modulation depth by monitoring the voltage of the rectified DC power source in operation 693.

[0098] In one embodiment, the power receiving device (320) can monitor the modulation depth, which is the difference between the magnitude of the rectified voltage when the switching circuit turns on the modulation and the magnitude of the rectified voltage when the modulation is turned off. The modulation depth may be changed by various factors. For example, the modulation depth is due to the mutual inductance between the transmitting coil (e.g., the transmitting coil (315) in FIG. 3) and the receiving coil (e.g., the receiving coil (321) in FIG. 3) where wireless charging takes place, the coupling k value between the transmitting coil (315) and the receiving coil (321), the load current of the power receiver (e.g., the power receiver (610) in FIG. 6a and / or FIG. 6b), the operating frequency of the receiving coil (321), the resonant capacitance of the wireless power transmitter (e.g., the power transmission device (310) in FIG. 3 to 5), the inductance of the transmitting coil (315), the resonant capacitance of the power receiver (610), the inductance of the receiving coil (321), and / or the inverter of the wireless power transmitter (310) (e.g., the inverter (313) in FIG. 3). The modulation direction and / or modulation magnitude can be changed by the applied voltage. There may be a difference between the rectified voltage when the switching circuit turns on modulation and the rectified voltage when the switching circuit turns off modulation. The difference between the magnitude of the rectified voltage when the switching circuit turns on modulation and the magnitude of the rectified voltage when the switching circuit turns off modulation can be defined as the modulation depth.

[0099] For example, to change the capacitance value of the front end of the rectifier (323) of the power receiving device (320), the switching circuit may turn on modulation when the switching circuit closes the switch connected to the capacitor. In this way, the modulation of the signal may be enabled when the switching circuit turns on the modulation. As another example, the switching circuit may turn off modulation when the switch connected to the capacitor opens. In this way, the modulation of the signal may be disabled when the switching circuit turns off the modulation.

[0100] When the modulation depth increases, audible noise may occur during signal modulation. The greater the change in the capacitance value formed by the modulation capacitors (e.g., the modulation capacitors (531, 532, 533, 534) of FIG. 5), the greater the range of change in the rectified voltage at the front end of the rectifier (323) of the power receiving device (320). For example, as the range of change in the rectified voltage at the front end of the rectifier (323) of the power receiving device (320) increases, noise in the audible frequency band of 2KHz, which is the frequency band used for modulation, may occur.

[0101] In one embodiment, the power receiving device (320) can identify a detuning switching unit that performs data modulation based on the modulation depth in operation 694.

[0102] In one embodiment, the power receiving device (320) can control the modulation circuit so that data is modulated through the identified detuning switching unit in operation 695, thereby limiting the modulation depth so that the modulation depth falls within a specified range.

[0103] In one embodiment, the power receiving device (320) may select one of a plurality of capacitance values ​​such that the modulation depth falls within a specified range. The processor (120) of the power receiving device (320) may control the capacitance value formed by the modulation capacitors (531, 532, 533, 534). The processor (120) may dynamically vary the capacitance value to control the rectified voltage such that the difference value in the magnitude of the rectified voltage falls within a specified range when the modulation is turned on and off.

[0104] A power receiving device (320) according to one embodiment may configure a feedback system that controls the modulation depth, which is the difference between the modulation on / off of the rectified voltage of the power receiving device (320) due to a change in capacitance during modulation for wireless charging, to within a specified range. Accordingly, the processor (120) can reduce the audible noise generated at the front end of the rectifier (323) during modulation for in-band communication.

[0105] A power receiving device (320) according to one embodiment may be prepared to implement a plurality of selectable capacitance values ​​to dynamically vary the capacitance value. For example, the power receiving device (320) may store the plurality of selectable capacitance values ​​in a memory (e.g., memory (130) of FIG. 1) in the form of a look-up table (LUT). As another example, the power receiving device (320) may store in the memory (130) a method for controlling a switching circuit to implement a capacitance value to be selected among the plurality of capacitance values. The plurality of selectable capacitance values ​​in the form of a look-up table stored in the memory (130) or the method for controlling the switching circuit may be referred to as a modulation control table.

[0106] In one embodiment, the power receiving device (320) can control a modulation circuit (e.g., the modulation circuit (623) of FIG. 6a and / or FIG. 6b) based on data to be transmitted to the wireless power transmitter (310) in operation 696.

[0108] FIG. 7 is a table (700) showing a modulation control table according to one embodiment.

[0109] In one embodiment, the modulation control table may include information regarding the capacitance value of each of the modulation capacitors (531, 532, 533, 534), a plurality of modes depending on whether each of the modulation capacitors (531, 532, 533, 534) is used, and the total capacitance value formed by the modulation capacitors (531, 532, 533, 534).

[0110] In one embodiment, the capacitance value of each of the modulation capacitors (531, 532, 533, 534) can be set to a value capable of implementing a plurality of capacitance values ​​to be implemented. For example, when implementing a plurality of capacitance values ​​having a value of 22 or more and 191 or less as exemplified in FIG. 7, among the modulation capacitors (531, 532, 533, 534), the first capacitor (531) may have a value of 100 Ω, the second capacitor (532) may have a value of 47 Ω, the third capacitor (533) may have a value of 22 Ω, and the fourth capacitor (534) may have a value of 22 Ω. The capacitance value may have a value of 1 Ω or more and 1 μF or less. For example, the plurality of capacitance values ​​exemplified in FIG. 7 may be 22 Ω or more and 191 Ω or less.

[0111] In one embodiment, when the number of modulation capacitors (531, 532, 533, 534) is n (n is a natural number), there may be a total of 2^n modes depending on whether each of the modulation capacitors (531, 532, 533, 534) is used. For example, when the number of modulation capacitors (531, 532, 533, 534) is 4, there may be a total of 16 modes depending on whether each of the modulation capacitors (531, 532, 533, 534) is used. Whether each of the modulation capacitors (531, 532, 533, 534) is used may be whether the switch connected to each of the modulation capacitors (531, 532, 533, 534) is turned on or off. In FIG. 7, the case where the switch connected to each of the modulation capacitors (531, 532, 533, 534) is turned on is indicated as 1, and the case where it is turned off is indicated as 0.

[0112] In one embodiment, the total capacitance value may be the capacitance value formed by the capacitors with the connected switches turned on among the modulation capacitors (531, 532, 533, 534). For example, in an off mode (710), when the switch connected to the first capacitor (531), the switch connected to the second capacitor (532), the switch connected to the third capacitor (533), and the switch connected to the fourth capacitor (534) are all turned off, the total capacitance value may be 0. As another example, in a default mode (720), when the switch connected to the first capacitor (531) is turned on and the switch connected to the second capacitor (532), the switch connected to the third capacitor (533), and the switch connected to the fourth capacitor (534) are turned off, the total capacitance value may be 100. As another example, when the switch connected to the second capacitor (532) and the switch connected to the third capacitor (533) are turned on, and the switch connected to the first capacitor (531) and the switch connected to the fourth capacitor (534) are turned off, the total capacitance value may be 69.

[0113] In one embodiment, the modulation control table may be configured such that the capacitance value that changes during modulation increases as the upper value is changed. The setting to increase the capacitance value may correspond to the operation of adjusting the modulation setting value to an upper value. In FIGS. 8 to 12 below, the increase in the capacitance value may correspond to the operation of adjusting the modulation setting value (e.g., mode setting value) to an upper value. For example, when changing whether to use the second capacitor (532), which has an upper value than the third capacitor (533), the capacitance value that changes during modulation may increase from 22 to 47. As another example, when changing whether to use the first capacitor (531), which has an upper value than the second capacitor (532), the capacitance value that changes during modulation may increase from 47 to 100.

[0115] FIG. 8 is a graph (800) showing the calculation of an average value of the modulation depth according to one embodiment. That is, the rectified voltage includes both the modulation off voltage and the modulation voltage described in this specification, and the modulation voltage refers only to the modulation voltage excluding the modulation off voltage.

[0116] In one embodiment, the processor (120) of the power receiving device (320) can calculate the average value of the modulation depth in packet units. A packet may refer to a unit in which communication data is transmitted. The processor (120) can calculate the magnitude of the modulation voltage for each first packet (810), second packet (820), and third packet (830).

[0117] The rectified voltage may include a modulation off voltage (840), an average modulation voltage (850), a maximum modulation voltage (851), and a minimum modulation voltage (852). The modulation voltage may include the average modulation voltage (850), the maximum modulation voltage (851), and the minimum modulation voltage (852), excluding the modulation off voltage (840).

[0118] In one embodiment, the processor (120) can calculate the average value of the modulation depth per packet unit. The processor (120) can calculate the magnitude of the average modulation voltage (850) based on the modulation off voltage (840), which is the modulation voltage when all switches are turned off.

[0119] In one embodiment, the processor (120) can determine whether the magnitude of the average modulation voltage (850) falls within a range between the maximum modulation voltage (851) and the minimum modulation voltage (852). The maximum modulation voltage (851) and the minimum modulation voltage (852) may be preset voltage values. In one embodiment, the maximum modulation voltage (851) and the minimum modulation voltage (852) may be values ​​set according to the application. For example, the maximum modulation voltage (851) and the minimum modulation voltage (852) may be preset values ​​according to the function performed by the application. The processor (120) can control the modulation voltage so that the magnitude of the average modulation voltage (850) falls within a range between the maximum modulation voltage (851) and the minimum modulation voltage (852).

[0120] In one embodiment, the processor (120) can calculate an average value by measuring the modulation depth for each packet when wireless charging starts and packet modulation occurs. The processor (120) can calculate the average value of the modulation depth by taking the average of the sum of the values ​​measured for each packet.

[0122] FIG. 9 is a graph (900) showing the calculation of the average value of the modulation depth according to another embodiment.

[0123] In another embodiment, the processor (120) of the power receiving device (320) can calculate the magnitude of the modulation voltage for each of the first packet (810), the second packet (820), and the third packet (830).

[0124] In another embodiment, the processor (120) can calculate the average value of the modulation depth per packet unit. The processor (120) can calculate the magnitude of the average modulation voltage (850) based on the modulation off voltage (840), which is the modulation voltage when all switches are off.

[0125] In another embodiment, the processor (120) may use a modulation voltage having a value between an upper threshold range (911) and a lower threshold range (912) when calculating the average modulation voltage (850). The processor (120) may exclude modulation voltages that fall outside the upper threshold range (911) and the lower threshold range (912) when calculating the average modulation voltage (850). For example, the upper threshold range (911) and the lower threshold range (912) may be set within a specified range (or ratio).

[0126] In one embodiment, the processor (120) can calculate an average value by measuring the modulation depth for each packet when wireless charging starts and packet modulation occurs. The processor (120) can calculate the average value of the modulation depth by taking the average value for the remaining samples, excluding a certain upper percentage and a certain lower percentage of the total sample values ​​to be averaged. Accordingly, the processor (120) can improve the accuracy of the average value of the modulation depth.

[0128] FIG. 10a is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 10b is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 10c is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment. FIG. 10d is a graph showing the change in modulation voltage when controlling the modulation depth according to one embodiment.

[0129] In one embodiment, the processor (120) of the power receiving device (320) can control the magnitude of the modulation voltage for each of the first packet (810), the second packet (820), the third packet (830), the fourth packet (841), the fifth packet (855), and the sixth packet (860). The processor (120) can control the magnitude of the modulation voltage by comparing it with the magnitude of the modulation off voltage (840).

[0130] In one embodiment, controlling the modulation depth in FIG. 10a, FIG. 10b, FIG. 10c, and FIG. 10d can be done independently.

[0131] In one embodiment, FIG. 10a shows a case where the modulation voltage is controlled once when the modulation voltage is greater than or equal to the first threshold voltage (1011) to control the modulation voltage to be less than or equal to the first threshold voltage (1011).

[0132] In one embodiment, the processor (120) may reduce the modulation voltage of the next packet by adjusting the modulation setting value to a lower value when the magnitude of the modulation voltage during any one packet for rising modulation is greater than or equal to the first threshold voltage (1011) when the modulation voltage is higher than the modulation off voltage (840). The first threshold voltage (1011) may be a value higher than the modulation off voltage (840) by a specified value. For example, the first threshold voltage (1011) may be a value about 100 mV higher than the modulation off voltage (840). For example, the processor (120) may reduce the magnitude of the modulation voltage of the second packet (820) to less than or equal to the first threshold voltage (1011) by adjusting the modulation setting value to a lower value because the magnitude of the modulation voltage of the first packet (810) is greater than or equal to the first threshold voltage (1011).

[0133] In one embodiment, FIG. 10b illustrates a case where the modulation voltage is controlled twice to control the modulation voltage to be below the first threshold voltage (1011) when the modulation voltage is above the first threshold voltage (1011).

[0134] In one embodiment, the processor (120) may reduce the modulation voltage of the next packet by adjusting the modulation setting value to a lower value when the magnitude of the modulation voltage during any one packet for rising modulation is greater than or equal to the first threshold voltage (1011) when the modulation voltage is higher than the modulation off voltage (840). The first threshold voltage (1011) may be a value higher than the modulation off voltage (840) by a specified value. For example, the first threshold voltage (1011) may be a value about 100 mV higher than the modulation off voltage (840). For example, the processor (120) may reduce the magnitude of the modulation voltage of the second packet (820) by adjusting the modulation setting value to a lower value because the magnitude of the modulation voltage of the first packet (810) is greater than or equal to the first threshold voltage (1011).

[0135] In one embodiment, when the modulation voltage magnitude is greater than or equal to the first threshold voltage (1011) and the modulation voltage continues to increase, the processor (120) may further adjust the modulation setting value to reduce the modulation voltage magnitude of the next packet (e.g., the third packet (830)) to less than or equal to the first threshold voltage (1011). For example, when the modulation voltage magnitude of the second packet (820) is greater than or equal to the first threshold voltage (1011) and the modulation voltage continues to increase, the processor (120) may further adjust the modulation setting value to an upper value to reduce the modulation voltage magnitude of the third packet (830) to less than or equal to the first threshold voltage (1011).

[0136] In one embodiment, FIG. 10c shows a case where the modulation voltage is controlled once when the modulation voltage is below the second threshold voltage (1012) to control the modulation voltage to above the second threshold voltage (1012).

[0137] In one embodiment, the processor (120) may increase the modulation voltage of the next packet by adjusting the modulation setting value to an upper value when the magnitude of the modulation voltage during any one packet is less than or equal to the second threshold voltage (1012). For example, the processor (120) may increase the modulation voltage of the next packet to an upper value when the magnitude of the modulation voltage of the fourth packet (841) is less than or equal to the second threshold voltage (1012).

[0138] In one embodiment, FIG. 10d shows a case where the modulation voltage is controlled twice to raise the modulation voltage to a level greater than or equal to the second threshold voltage (1012) when the modulation voltage is lower than or equal to the second threshold voltage (1012).

[0139] In one embodiment, the processor (120) may adjust the modulation setting value to an upper value to increase the modulation voltage of the next packet to an upper value when the magnitude of the modulation voltage during any packet for down-modulation is lower than the modulation off voltage (840) and is less than or equal to the second threshold voltage (1012). The second threshold voltage (1012) may be a value lower than the modulation off voltage (840) by a specified amount. For example, the second threshold voltage (1012) may be a value about 100 mV lower than the modulation off voltage (840). For example, since the magnitude of the modulation voltage of the fourth packet (841) is less than or equal to the second threshold voltage (1012), the processor (120) may adjust the modulation setting value to an upper value to increase the magnitude of the modulation voltage of the fifth packet (855) to an upper value.

[0140] In one embodiment, if the modulation voltage magnitude is below the second threshold voltage (1012) and the modulation voltage continues to decrease, the processor (120) may further adjust the modulation setting value to increase the magnitude of the next modulation voltage. For example, the processor (120) may detect that the modulation voltage magnitude of the fifth packet (855) is below the second threshold voltage (1012) and the modulation voltage continues to decrease. If the processor (120) sets the modulation setting value to an upper value to raise the level of the fourth packet (841) above the second threshold voltage, but the level of the fifth packet (855) instead drops further below the second threshold voltage, the processor may further adjust the modulation setting value to a lower value to increase the magnitude of the modulation voltage of the sixth packet (860) above the second threshold voltage (1012).

[0141] In one embodiment, the processor (120) can perform a modulation depth control operation. The processor (120) can maintain the average value of the modulation depth for a plurality of packets within a specified range. The processor (120) can set a modulation control table value to maintain the average value of the modulation depth within a specified range.

[0143] FIG. 11a is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 11b is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 11c is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment. FIG. 11d is a flowchart illustrating a method for controlling a modulated voltage by controlling the modulation depth according to one embodiment.

[0144] In one embodiment, controlling the modulation depth in FIG. 11a, FIG. 11b, FIG. 11c, and FIG. 11d can be done independently.

[0145] In one embodiment, FIG. 11a illustrates a case where the modulation voltage is controlled once to lower the modulation voltage to the first threshold voltage (1011) when the modulation voltage is greater than or equal to the first threshold voltage (1011). FIG. 11a may correspond to FIG. 10a.

[0146] A processor (e.g., processor (120) of FIG. 3) of a power receiving device (320) according to one embodiment may, in operation 1111, adjust a modulation setting value to a lower value when the modulation voltage is greater than or equal to a first threshold voltage. The processor (120) may change a mode setting value to one lower value when the average modulation voltage value of any packet is greater than or equal to the first threshold voltage. When the average modulation voltage value of any packet is greater than or equal to the first threshold voltage, the processor (120) may set a modulation control table to one lower mode and select a value one lower than a previously selected value among a plurality of capacitance values. The processor (120) may reduce the set capacitance value by changing the selected mode to a lower mode.

[0147] A processor (120) according to one embodiment can confirm in operation 1113 that the modulation voltage in the next packet is below the first threshold voltage. The processor (120) can confirm that the modulation voltage has changed to fall within a specified range as the modulation setting value is adjusted.

[0148] A processor (120) according to one embodiment can maintain a modulation setting value in operation 1115. The processor (120) can verify that the adjustment of the modulation setting value has been made in the correct direction and can perform modulation using the adjusted modulation setting value.

[0150] In one embodiment, FIG. 11b illustrates a case where the modulation voltage is controlled twice to control the modulation voltage to be below the first threshold voltage (1011) when the modulation voltage is above the first threshold voltage (1011). FIG. 11b may correspond to FIG. 10b.

[0151] A processor of a power receiving device (320) according to one embodiment (e.g., processor (120) of FIG. 3) can adjust a modulation setting value to a lower value when the modulation voltage is greater than or equal to a first threshold voltage in operation 1121.

[0152] A processor (120) according to one embodiment can check whether the modulation voltage has increased compared to the previous packet in operation 1123 if the modulation voltage in the next packet is continuously above the first threshold voltage.

[0153] In one embodiment, it can be checked whether a case occurs in which the modulation voltage is above a first threshold voltage and the modulation voltage increases compared to the previous packet (e.g., continuously above the first threshold voltage). The processor (120) can control the modulation voltage so that the modulation voltage does not exceed a specified range when the modulation voltage is above the first threshold voltage and the modulation voltage increases compared to the previous packet. The direction and magnitude of the change in the modulation voltage may vary depending on a combination of various factors. For example, unlike the direction in which the modulation voltage generally changes during modulation in a load section, the direction in which the modulation voltage changes may be reversed under a specific load.

[0154] In one embodiment, the processor (120) can read the average value of the modulation voltage of a plurality of packets to increase the reliability of the measurement value referenced for adjusting the modulation setting value. For example, the processor (120) can read the average value of the modulation voltage of the next three packets. If the average value of the modulation voltage of the next three packets is higher than the average value of the modulation voltage previously read, the processor (120) can change the mode setting value to one higher value. The processor (120) can set the modulation control table to one higher mode and select a value one higher than the previously selected value among the plurality of capacitance values. The processor (120) can increase the set capacitance value by changing the selected mode to the higher mode.

[0155] In operation 1125, the processor (120) according to one embodiment may adjust the modulation setting value to an upper value when the modulation voltage is greater than or equal to a first threshold voltage and the modulation voltage has increased compared to the previous packet. The processor (120) may set the modulation control table to one upper mode and select a value one upper than the previously selected value among a plurality of capacitance values. The processor (120) may increase the set capacitance value by changing the selected mode to an upper mode.

[0156] A processor (120) according to one embodiment can confirm in operation 1127 that the modulation voltage in the next packet is below the first threshold voltage. The processor (120) can confirm that the modulation voltage has changed to fall within a specified range as the modulation setting value is adjusted.

[0157] A processor (120) according to one embodiment can maintain a modulation setting value in operation 1129. The processor (120) can verify that the adjustment of the modulation setting value has been made in the correct direction and can perform modulation using the adjusted modulation setting value.

[0159] In one embodiment, FIG. 11c illustrates a case where the modulation voltage is controlled once to raise the modulation voltage to a second threshold voltage (1012) or higher when the modulation voltage is lower than or equal to the second threshold voltage (1012). FIG. 11c may correspond to FIG. 10c.

[0160] A processor of a power receiving device (320) according to one embodiment (e.g., processor (120) of FIG. 3) can adjust a modulation setting value to an upper value when the modulation voltage is lower than or equal to a second threshold voltage in operation 1131.

[0161] A processor (120) according to one embodiment can confirm in operation 1133 that the modulation voltage in the next packet is greater than or equal to the second threshold voltage. The processor (120) can confirm that the modulation voltage has changed to fall within a specified range as the modulation setting value is adjusted.

[0162] A processor (120) according to one embodiment can maintain a modulation setting value in operation 1135. The processor (120) can verify that the adjustment of the modulation setting value has been made in the correct direction and can perform modulation using the adjusted modulation setting value.

[0164] In one embodiment, FIG. 11d illustrates a case where the modulation voltage is controlled twice to raise the modulation voltage to a level greater than or equal to the second threshold voltage (1012) when the modulation voltage is lower than or equal to the second threshold voltage (1012). FIG. 11d may correspond to FIG. 10d.

[0165] A processor of a power receiving device (320) according to one embodiment (e.g., processor (120) of FIG. 3) can adjust a modulation setting value to an upper value when the modulation voltage is lower than or equal to a second threshold voltage in operation 1141.

[0166] A processor (120) according to one embodiment can check in operation 1143 whether the modulation voltage in the next packet has been reduced compared to the previous packet if the modulation voltage is continuously below the second threshold voltage.

[0167] In one embodiment, the processor (120) may adjust the modulation setting value to a lower value if the modulation voltage decreases compared to the previous packet in operation 1145. The processor (120) may control the modulation voltage so that the modulation voltage does not exceed a specified range if the modulation voltage decreases in the next packet. For example, the processor (120) may read the average value of the modulation voltage of the next three packets. If the average value of the modulation voltage of the next three packets is lower than the average value of the modulation voltage previously read, the processor (120) may change the mode setting value to one lower value. The processor (120) may set the modulation control table to one lower mode to set the modulation setting value to the modulation setting value prior to being adjusted to an upper value in operation 1141. The processor (120) may increase the set capacitance value by changing the selected mode to a lower mode.

[0168] In one embodiment, the processor (120) can confirm in operation 1147 that the modulation voltage in the next packet is greater than or equal to the second threshold voltage. The processor (120) can confirm that the modulation voltage has changed to fall within a specified range as the modulation setting value is adjusted.

[0169] A processor (120) according to one embodiment can maintain a modulation setting value in operation 1149. The processor (120) can verify that the adjustment of the modulation setting value has been made in the correct direction and can perform modulation using the adjusted modulation setting value.

[0170] A processor (120) according to one embodiment can control the rectified voltage such that the modulation depth falls within a specified range while repeating operations 1111 to 1149 described in FIGS. 11a to 11d. The processor (120) can repeat operations 1111 to 1149. The processor (120) can control the rectified voltage to be below a first threshold voltage and above a second threshold voltage.

[0172] FIG. 12 is a flowchart (1200) showing a method for controlling modulation depth according to one embodiment.

[0173] A power transmission device (310) according to one embodiment can start power transmission in operation 1205. The power transmission device (310) can transmit power wirelessly using a transmission coil (e.g., a transmission coil (315) of FIG. 3).

[0174] A processor of a power receiving device (320) according to one embodiment (e.g., processor (120) of FIG. 3) can set a modulation voltage in operation 1210. The processor (120) can set the modulation voltage to a value within a specified range.

[0175] A processor (120) according to one embodiment can modulate packets in operation 1215. The processor (120) can initiate packet modulation when performing in-band communication related to wireless power transmission. The processor (120) can modulate the signal transmitted to the charging device (310) in the in-band communication in packet units.

[0176] A processor (120) according to one embodiment can count packets in operation 1220. The processor (120) can measure the number of packets of a signal while modulating a signal for in-band communication. The processor (120) can number the current packet to determine which packet it is. The processor (120) can number the packets by increasing the number by one when moving to the next packet.

[0177] A processor (120) according to one embodiment may determine in operation 1225 whether a specified count has been reached. The specified count may be a unit for adjusting the modulation voltage. For example, if the modulation voltage is adjusted every three packets, the processor (120) may determine whether the count is 3. If the processor (120) reaches the specified count (operation 1225 - YES), it may proceed to operation 1230. If the processor (120) has a count smaller than the specified count (operation 1225 - NO), it may return to operation 1215.

[0178] A processor (120) according to one embodiment may determine whether the modulation voltage is greater than or equal to a first threshold voltage in operation 1230. If the modulation voltage is greater than or equal to the first threshold voltage (operation 1230 - YES), the processor (120) may proceed to operation 1235. If the modulation voltage is less than the first threshold voltage (operation 1230 - NO), the processor (120) may proceed to operation 1240.

[0179] A processor (120) according to one embodiment can adjust a modulation setting value to a lower value in operation 1235. The processor (120) can decrease the value of a mode that selects one of a plurality of capacitance values ​​by one. The processor (120) can decrease the selected capacitance value among a plurality of capacitance values.

[0180] A processor (120) according to one embodiment may determine in operation 1240 whether the modulation voltage is below a second threshold voltage. If the modulation voltage is below the second threshold voltage (operation 1240 - YES), the processor (120) may proceed to operation 1245. If the modulation voltage is greater than the second threshold voltage (operation 1240 - NO), the processor (120) may return to operation 1210.

[0181] A processor (120) according to one embodiment can adjust a modulation setting value to an upper value in operation 1245. The processor (120) can increase the value of a mode that selects one of a plurality of capacitance values ​​by one. The processor (120) can increase the selected capacitance value among a plurality of capacitance values.

[0182] A processor (120) according to one embodiment can check in operation 1250 whether the modulation voltage is greater than or equal to a first threshold value and whether the modulation voltage is increasing. If the modulation voltage is greater than or equal to the first threshold value and the modulation voltage is increasing (operation 1250 - YES), the processor (120) can proceed to operation 1255. If the modulation voltage is less than the first threshold value or the modulation voltage is decreasing (operation 1235 - NO), the processor (120) can return to operation 1215. For example, whether the modulation voltage is increasing or decreasing may be based on the result of comparing the modulation voltage of a currently specified number (e.g., 3) of packets (e.g., packet numbers N to N+2) with the modulation voltage of a previously specified number (e.g., 3) of packets (e.g., N-3 to N-1).

[0183] A processor (120) according to one embodiment can adjust a modulation setting value to an upper value in operation 1255. The processor (120) can increase the value of a mode that selects one of a plurality of capacitance values ​​by one. The processor (120) can increase the selected capacitance value among a plurality of capacitance values.

[0184] A processor (120) according to one embodiment can determine in operation 1260 whether the modulation voltage is below a second threshold value and whether the modulation voltage is decreasing. If the modulation voltage is below the second threshold value and the modulation voltage is decreasing (operation 1260 - YES), the processor (120) can proceed to operation 1265. If the modulation voltage is greater than the second threshold value or the modulation voltage is increasing (operation 1260 - NO), the processor (120) can return to operation 1215.

[0185] A processor (120) according to one embodiment can adjust a modulation setting value to a lower value in operation 1265. The processor (120) can decrease the value of a mode that selects one of a plurality of capacitance values ​​by one. The processor (120) can decrease the selected capacitance value among a plurality of capacitance values.

[0186] A processor (120) according to one embodiment can maintain the modulation depth within a specified range through operations 1235, 1245, 1255, and 1265. The processor (120) can maintain the modulation depth within a specified range by performing at least one of operations 1235, 1245, 1255, and 1265 at least once. The processor (120) can repeatedly perform the same operation in response to a failure to control the modulation voltage in the intended direction when at least one of operations 1235, 1245, 1255, and 1265 is performed once. The processor (120) can select and perform at least one of operations 1235, 1245, 1255, and 1265 so that the modulation voltage is controlled in the intended direction. The processor (120) can maintain the modulation depth within a specified range while modulating the signal transmitted to the charging device (310) in in-band communication.

[0187] When applying the technique for modulating the signal of in-band communication described in this document, the modulation depth of the rectified voltage can be limited to within a set range. For example, the maximum modulation depth can be reduced from the existing 1.2V to 0.8V by dynamically controlling the modulation depth of the rectified voltage.

[0188] When the in-band communication signal modulation technique described in this document is applied to an actual system, it can have the effect of limiting the maximum modulation depth. The lower the threshold value of the specified range of modulation depth is set, the greater the effect of reducing audible noise may be.

[0190] A power receiving device according to various embodiments (e.g., power receiving device (320) of FIG. 6a) comprises a power receiving unit (e.g., power receiving unit (610) of FIG. 6a), a communication circuit (e.g., communication circuit (620) of FIG. 6a), a modulation depth monitoring circuit (e.g., modulation depth monitoring circuit (630) of FIG. 6a), and a processor (e.g., processor (120) of FIG. 6a) electrically connected to the power receiving unit (610), the communication circuit (620), and the modulation depth monitoring circuit (630), wherein the power receiving unit (610) receives power from a wireless power transmitter (e.g., power transmitting device (310) of FIG. 3) and a receiving circuit (e.g., receiving circuit (611) of FIG. 6a) comprising a coil (e.g., receiving coil (321) of FIG. 3) and a first capacitor (e.g., capacitor (421) of FIG. 4) and the power received by the receiving circuit (611). It includes a rectifier circuit that rectifies power and converts it into DC power (e.g., the rectifier circuit (612) of FIG. 6a), and the communication circuit (620) includes a second capacitor (e.g., the modulation capacitors (531, 532, 533, 543) of FIG. 5) and a switch (e.g., the switches (535, 536, 537, 538) of FIG. 5), a plurality of detuning switching units (e.g., the first detuning switching unit (621) and the second detuning switching unit (622) of FIG. 6a) that change the voltage of the power received by the coil (321), and a modulation circuit (e.g., the modulation circuit (623) of FIG. 6a) for turning the switches (535, 536, 537, 538) on or off based on a control signal received from the processor (120), and the modulation depth monitoring The circuit (630) monitors the voltage of the rectified DC power to measure the modulation depth and provides it to the processor (120), and the processor (120) identifies the detuning switching unit among the plurality of detuning switching units (621, 622) to perform data modulation based on the modulation depth, andThe modulation circuit (623) can be controlled so that data is modulated through the confirmed detuning switching unit to limit the modulation depth so that the modulation depth falls within a specified range, and the modulation circuit (623) can be controlled based on the data to be transmitted to the wireless power transmitter (310).

[0191] In one embodiment, the modulation depth monitoring circuit (630) may obtain a voltage of the rectified DC power as a first voltage when the modulation circuit (630) turns on the switch (535, 536, 537, 538) for each of the plurality of packets received by the communication circuit (620), obtain a voltage of the rectified DC power as a second voltage when the modulation circuit (623) turns off the switch (535, 536, 537, 538) for each of the plurality of packets, and calculate the average value of the difference values ​​between the first voltage and the second voltage for each of the plurality of packets as the modulation depth.

[0192] In one embodiment, the processor (120) can dynamically select the detuning switching unit to perform the data modulation and control the modulation depth to fall within the specified range.

[0193] In one embodiment, the processor (120) can select the detuning switching unit to perform the data modulation and select a capacitance value associated with the data modulation.

[0194] In one embodiment, the processor (120) can implement a capacitance value related to data modulation by changing the capacitance value of the second capacitors (531, 532, 533, 534) when the second capacitors (531, 532, 533, 534) are variable capacitors.

[0195] In one embodiment, a memory (e.g., memory (130) of FIG. 1) that stores a plurality of capacitance values ​​related to the data modulation in the form of a modulation control table is further included, and the processor (120) can select any one mode that implements any one of the capacitance values ​​among a plurality of modes according to usage included in the modulation control table.

[0196] In one embodiment, the modulation control table may be configured such that the capacitance value that changes during data modulation increases as the upper value is changed.

[0197] In one embodiment, the processor (120) may be configured to measure the modulation depth for each packet and calculate an average value when wireless charging starts and packet modulation occurs.

[0198] In one embodiment, the processor (120) may be configured to calculate the average value of the modulation depth by taking the average value of the remaining samples excluding a certain upper ratio and a certain lower ratio among all sample values ​​to be averaged.

[0199] In one embodiment, the processor (120) may be configured to increase the modulation voltage of the next packet when the magnitude of the modulation voltage during any one packet for rising modulation is greater than or equal to a first threshold voltage (e.g., the first threshold voltage (1011) of FIG. 10a).

[0200] In one embodiment, the processor (120) may be configured to reduce the magnitude of the next modulation voltage to below the first threshold voltage (1011) when the magnitude of the modulation voltage is greater than or equal to the first threshold voltage (1011) and the modulation voltage continues to increase.

[0201] In one embodiment, the processor (120) may be configured to reduce the modulation voltage of the next packet to a second threshold voltage (e.g., second threshold voltage (1012) of FIG. 10c) or lower through a voltage lower than the modulation off voltage (e.g., modulation off voltage (840) of FIG. 8) when the magnitude of the modulation voltage during any one packet for down-modulation is lower than the first threshold voltage (1011).

[0202] In one embodiment, the processor (120) may be configured to increase the magnitude of the next modulation voltage when the magnitude of the modulation voltage is less than or equal to the second threshold voltage (1012).

[0203] In one embodiment, the processor (120) may be configured to adjust the modulation setting value to a lower value when the modulation voltage is greater than or equal to the first threshold voltage (1011) and less than or equal to the maximum modulation voltage (e.g., the maximum modulation voltage (851) of FIG. 8).

[0204] In one embodiment, the processor (120) may be configured to adjust the modulation setting value to an upper value when the modulation voltage increases in the next packet.

[0205] In one embodiment, the processor (120) may be configured to adjust the modulation setting value to an upper value when the modulation voltage is greater than or equal to the second threshold voltage (1012) or the minimum modulation voltage (e.g., the minimum modulation voltage (852) of FIG. 8).

[0206] In one embodiment, the processor (120) may be configured to adjust the modulation setting value to a lower value when the modulation voltage decreases in the next packet.

[0207] A method for controlling the charging of a power receiving device (320) according to various embodiments may include: receiving power from a wireless power transmitter (310); rectifying the received power to convert it into DC power; monitoring the voltage of the rectified DC power to measure the modulation depth; identifying a detuning switching unit to perform data modulation based on the modulation depth; controlling a modulation circuit (623) to modulate data through the identified detuning switching unit to limit the modulation depth so that the modulation depth falls within a specified range; and controlling the modulation circuit (623) based on the data to be transmitted to the wireless power transmitter.

[0208] In one embodiment, the operation of measuring the modulation depth may include the operation of obtaining a first voltage of the rectified DC power when the modulation circuit (623) turns on the switch (535, 536, 537, 538) for each of the plurality of packets received by the communication circuit (620), the operation of obtaining a second voltage of the rectified DC power when the modulation circuit (623) turns off the switch (535, 536, 537, 538) for each of the plurality of packets, and the operation of calculating the average value of the difference between the first voltage and the second voltage for each of the plurality of packets as the modulation depth.

[0209] In one embodiment, the operation of limiting the modulation depth may include dynamically selecting the detuning switching unit to perform the data modulation and controlling the modulation depth to fall within the specified range.

[0211] The electronic device according to the various embodiments disclosed in this document may be of various forms. The electronic device may include, for example, a portable communication device (e.g., a smartphone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a consumer electronics device. The electronic device according to the embodiments of this document is not limited to the devices described above.

[0212] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said 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 said items unless the relevant context clearly indicates otherwise. In this document, phrases such as "A or B," "at least one of A and B," "at least one of A or B," "A, B or C," "at least one of A, B and C," and "at least one of A, B, or C" may each 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 simply to distinguish said components from other said components and do not limit said components in any other aspect (e.g., importance or order). Where any (e.g., 1st) component is referred to as “coupled” or “connected” to another (e.g., 2nd) component, with or without the terms “functionally” or “communicationly,” it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0213] The term “module” as used in the 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, for example. A module may be a component formed integrally, or a minimum unit of said 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).

[0214] Various embodiments of the present document may be implemented as software (e.g., program (140)) comprising one or more instructions stored in a storage medium (e.g., internal memory (136) or external memory (138)) readable by a machine (e.g., electronic device (101)). For example, a processor (e.g., processor (120)) of the machine (e.g., electronic device (101)) may call at least one of the one or more instructions stored in the storage medium and execute it. This enables the machine to be operated 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 that can be executed by an interpreter. The storage medium readable by the machine may be provided in the form of a non-transitory storage medium. Here, 'non-temporary' simply means that the storage medium is a tangible device and does not contain a signal (e.g., electromagnetic waves), and the term does not distinguish between cases where data is stored semi-permanently and cases where it is stored temporarily.

[0215] According to one embodiment, the method according to the various embodiments disclosed herein 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 product. The computer program product may be distributed in the form of a device-readable storage medium (e.g., compact disc read-only memory (CD-ROM)), or distributed online (e.g., download or upload) through an application store (e.g., Play Store™) or directly between two user devices (e.g., smartphones). In the case of online distribution, at least a portion of the computer program product may be temporarily stored or temporarily created on a device-readable storage medium, such as the memory of a manufacturer's server, an application store's server, or a relay server.

[0216] According to various embodiments, each component (e.g., module or program) of the components described above may include a singular or multiple entities, and some of the multiple entities may be separated and placed in other components. According to various embodiments, one or more of the components or operations of the aforementioned components may be omitted, or one or more other components or operations may be added. Generally or additionally, multiple components (e.g., module or program) may be integrated into a single component. In this case, the integrated component may perform one or more functions of each of the multiple components in the same or similar manner as those performed by the corresponding component among the multiple components prior to integration. According to various embodiments, operations performed by the module, program, or other components 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.

Claims

Claim 1 A power receiving device comprises: a power receiving unit; a communication circuit; a modulation depth monitoring circuit; and a processor electrically connected to the power receiving unit, the communication circuit, and the modulation depth monitoring circuit, wherein the power receiving unit comprises: a receiving circuit that receives power from a wireless power transmitter and includes a coil and a first capacitor; and a rectifying circuit that rectifies the power received from the receiving circuit and converts it into DC power, and the communication circuit comprises a plurality of detuning switching units that change the voltage of the power received by the coil, and a second capacitor and a switch. A power receiving device comprising a modulation circuit for turning the switch on or off based on a control signal received from the processor, wherein the modulation depth monitoring circuit monitors the voltage of the rectified DC power to measure the modulation depth and provides it to the processor, wherein the processor identifies a detuning switching unit among the plurality of detuning switching units to perform data modulation based on the modulation depth, controls the modulation circuit to modulate data through the identified detuning switching unit to limit the modulation depth so that the modulation depth falls within a specified range, and controls the modulation circuit based on the data to be transmitted to the wireless power transmitter. Claim 2 A power receiving device according to claim 1, wherein the modulation depth monitoring circuit obtains, for each of a plurality of packets received by the communication circuit, a voltage of the rectified DC power when the modulation circuit turns on the switch as a first voltage, obtains, for each of the plurality of packets, a voltage of the rectified DC power when the modulation circuit turns off the switch as a second voltage, and calculates the average value of the difference values ​​between the first voltage and the second voltage for each of the plurality of packets as the modulation depth. Claim 3 A power receiving device according to claim 1, wherein the processor dynamically selects the detuning switching unit to perform the data modulation and controls the modulation depth to fall within the specified range. Claim 4 In claim 1, the processor is a power receiving device that selects a detuning switching unit to perform data modulation and selects a capacitance value associated with the data modulation. Claim 5 A power receiving device according to claim 1, wherein the processor, when the second capacitor is a variable capacitor, changes the capacitance value of the second capacitor to implement a capacitance value related to the data modulation. Claim 6 A power receiving device according to claim 1, further comprising a memory that stores a plurality of capacitance values ​​related to data modulation in the form of a modulation control table, wherein the processor selects one mode that implements one of the plurality of capacitance values ​​among a plurality of modes according to usage included in the modulation control table. Claim 7 A power receiving device according to claim 6, wherein the modulation control table is configured such that the capacitance value changing during data modulation increases as the upper value is changed. Claim 8 A power receiving device according to claim 1, wherein the processor is configured to measure the modulation depth for each packet and calculate an average value when wireless charging starts and packet modulation occurs. Claim 9 A power receiving device according to claim 8, wherein the processor is configured to calculate the average value of the modulation depth by taking the average value of the remaining samples excluding a certain upper ratio and a certain lower ratio among all sample values ​​to be averaged. Claim 10 A power receiving device according to claim 1, wherein the processor is configured to increase the modulation voltage of the next packet for rise modulation when the magnitude of the modulation voltage during any one packet is greater than or equal to a first threshold voltage. Claim 11 A power receiving device according to claim 10, wherein the processor is configured to reduce the magnitude of the next modulation voltage to below the first threshold voltage when the magnitude of the modulation voltage is above the first threshold voltage and the modulation voltage continues to increase. Claim 12 A power receiving device according to claim 10, wherein the processor is configured to reduce the modulation voltage of the next packet to a second threshold voltage or lower through a voltage lower than the modulation off voltage when the magnitude of the modulation voltage during any one packet for down-modulation is lower than the first threshold voltage. Claim 13 In claim 12, the processor is a power receiving device configured to increase the magnitude of the next modulation voltage when the magnitude of the modulation voltage is less than or equal to the second threshold voltage. Claim 14 In claim 12, the processor is a power receiving device configured to adjust a modulation setting value to a lower value when the modulation voltage is greater than or equal to a first threshold voltage and less than or equal to a maximum modulation voltage. Claim 15 In claim 14, the processor is a power receiving device configured to adjust the modulation setting value to an upper value when the modulation voltage increases in the next packet. Claim 16 In claim 12, the processor is a power receiving device configured to adjust a modulation setting value to an upper value when the modulation voltage is greater than or equal to the second threshold voltage or lower than the minimum modulation voltage. Claim 17 In claim 12, the processor is a power receiving device configured to adjust a modulation setting value to a lower value when the modulation voltage decreases in the next packet. Claim 18 A method for controlling the charging of a power receiving device comprises: receiving power from a wireless power transmitter; rectifying the received power to convert it into direct current power; monitoring the voltage of the rectified direct current power to measure the modulation depth; identifying a detuning switching unit to perform data modulation based on the modulation depth; controlling a modulation circuit to modulate data through the identified detuning switching unit to limit the modulation depth so that the modulation depth falls within a specified range; and controlling the modulation circuit based on the data to be transmitted to the wireless power transmitter. Claim 19 A method according to claim 18, wherein the operation of measuring the modulation depth comprises: an operation of obtaining a first voltage of the rectified DC power when the modulation circuit turns on the switch for each of the plurality of packets received by the communication circuit; an operation of obtaining a second voltage of the rectified DC power when the modulation circuit turns off the switch for each of the plurality of packets; and an operation of calculating the average value of the difference values ​​between the first voltage and the second voltage for each of the plurality of packets as the modulation depth. Claim 20 A method according to claim 18, wherein the operation of limiting the modulation depth includes dynamically selecting the detuning switching unit to perform the data modulation and controlling the modulation depth to fall within the specified range.

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