WO2022114615A1 - Dispositif de transmission de puissance et procédé de suivi de point de fonctionnement à efficacité maximale d'un système comprenant ledit dispositif de transmission de puissance et un dispositif de réception de puissance - Google Patents

Dispositif de transmission de puissance et procédé de suivi de point de fonctionnement à efficacité maximale d'un système comprenant ledit dispositif de transmission de puissance et un dispositif de réception de puissance Download PDF

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Publication number
WO2022114615A1
WO2022114615A1 PCT/KR2021/016369 KR2021016369W WO2022114615A1 WO 2022114615 A1 WO2022114615 A1 WO 2022114615A1 KR 2021016369 W KR2021016369 W KR 2021016369W WO 2022114615 A1 WO2022114615 A1 WO 2022114615A1
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WIPO (PCT)
Prior art keywords
parameter
power transmission
power
change
inverter
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PCT/KR2021/016369
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English (en)
Korean (ko)
Inventor
김도현
조치현
최영복
Original Assignee
삼성전자 주식회사
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Publication of WO2022114615A1 publication Critical patent/WO2022114615A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer

Definitions

  • Various embodiments disclosed in this document relate to a power transmitting apparatus, and a method for tracking a maximum efficiency operating point of a system including the power transmitting apparatus and the power receiving apparatus.
  • a power transmitting device such as a power supply device or a charging device may wirelessly transmit power to a power receiving device such as a portable electronic device or a wearable electronic device.
  • a portable electronic device or a wearable electronic device may be charged wirelessly.
  • wireless power transmission efficiency may be affected by various factors such as load impedance, operating frequency, and/or transmission distance.
  • the minimum power input point can be tracked while changing the inverter voltage output of the power transmitting device.
  • An optimal load impedance may be tracked using a change in the input impedance of the converter of the power receiving device.
  • the communication method for switching the switch connected to the rectifier and the communication method between the power transmitter and the power receiver are different. may be duplicated.
  • the communication methods overlap, it may not be easy to apply the switching for adjusting the output voltage of the rectifier to the rectifier because it collides with a load modulation operation of in-band communication.
  • the operating point at which the efficiency of the power transmitting apparatus is maximized may be different from the operating point at which the efficiency of the entire system including the power transmitting apparatus and the power receiving apparatus is maximized.
  • Various embodiments disclosed in this document provide a method and system for increasing power transmission efficiency of a system by tracking maximum efficiency point tracking (MEPT) of a system while maintaining a rectified voltage of a power receiving device want to
  • a power transmission apparatus may include a power supply unit, a converter, an inverter, a transmission coil, and a control unit.
  • the control unit obtains a rectified voltage transferred from the rectifier to the regulator, changes a first parameter among a plurality of parameters related to power transmission of the transmitting coil, and the difference value between the rectified voltage and the target rectified voltage is check whether it is equal to or greater than a threshold value, and if the difference value is equal to or greater than the threshold value, adjust a second parameter among the plurality of parameters based on a change in the first parameter so that the rectified voltage is maintained, and the first parameter and calculating the power transmission efficiency of the system after the second parameter is changed, maintaining the change direction of the first parameter when the power transmission efficiency increases, and changing the direction of the first parameter when the power transmission efficiency decreases may be set to be reversed, and the first parameter may be changed every first period to track a maximum efficiency operating point at which the power transmission efficiency of the system is maximized.
  • the maximum efficiency operating point tracking method of a system including a power transmitting device and a power receiving device includes an operation of obtaining a rectified voltage transmitted from a rectifier to a regulator, the rectified voltage and a target Checking whether the difference value between the rectified voltages is equal to or greater than a threshold value, when the difference value is equal to or greater than the threshold value, changing a first parameter among a plurality of parameters related to power transmission of a transmitting coil, the rectified voltage is adjusting a second parameter of the plurality of parameters based on a change in the first parameter to be maintained, calculating the power transmission efficiency of the system after the first parameter and the second parameter change; Maintaining the change direction of the first parameter when the power transmission efficiency increases, and reversely setting the change direction of the first parameter when the power transmission efficiency decreases, and changing the first parameter every first period and tracking a maximum efficiency operating point at which the power transmission efficiency of the system is maximized.
  • the power transmitting device when the power transmitting device transmits power to the power receiving device having a predetermined impedance at the input terminal of the rectifier under the condition of maintaining a specific rectifier circuit output voltage, the power transmitting device and the power receiving device are The maximum efficiency operating point at which the power transmission efficiency of the including system is maximized may be tracked.
  • FIG. 1 is a block diagram of an electronic device in a network environment according to various embodiments of the present disclosure
  • FIG. 2 is a block diagram of a power management module and a battery according to various embodiments of the present disclosure
  • FIG. 3 is a block diagram illustrating a system including a power transmitter and a power receiver according to an embodiment.
  • FIG. 4 is a flowchart illustrating a method for tracking a maximum efficiency operating point using a system according to an embodiment.
  • FIG. 5 is a flowchart illustrating a method for tracking a maximum efficiency operating point using a system according to an embodiment.
  • FIG. 6 is a flowchart illustrating a method for tracking a maximum efficiency operating point using a system according to an exemplary embodiment.
  • FIG. 7 is a graph showing constant maintenance of an inverter voltage variation according to a comparative example.
  • FIG. 8 is a graph illustrating adjustment of an inverter voltage change amount based on system efficiency according to an exemplary embodiment.
  • FIG. 9 is a graph illustrating adjusting the maximum efficiency operating point tracking period based on the efficiency of the system according to an exemplary embodiment.
  • FIG. 10 is a graph illustrating adjustment of an inverter voltage change amount and a maximum efficiency operating point tracking period based on system efficiency according to an exemplary embodiment.
  • FIG. 1 is a block diagram of an electronic device 101 in a network environment 100 according to various embodiments.
  • an electronic device 101 communicates with an electronic device 102 through a first network 198 (eg, a short-range wireless communication network) or a second network 199 . It may communicate with the electronic device 104 or the server 108 through (eg, a long-distance wireless communication network). According to an embodiment, the electronic device 101 may communicate with the electronic device 104 through the server 108 .
  • a first network 198 eg, a short-range wireless communication network
  • a second network 199 e.g., a second network 199
  • the electronic device 101 may communicate with the electronic device 104 through the server 108 .
  • the electronic device 101 includes a processor 120 , a memory 130 , an input module 150 , a sound output module 155 , a display module 160 , an audio module 170 , and a 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 an antenna module 197 may be included.
  • at least one of these components eg, the connection terminal 178
  • may be omitted or one or more other components may be added to the electronic device 101 .
  • some of these components are integrated into one component (eg, display module 160 ). can be
  • the processor 120 for example, executes software (eg, a program 140) to execute at least one other component (eg, a hardware or software component) of the electronic device 101 connected to the processor 120 . It can control and perform various data processing or operations. According to one embodiment, as at least part of data processing or operation, the processor 120 converts commands or data received from other components (eg, the sensor module 176 or the communication module 190 ) to the volatile memory 132 . may be stored in the volatile memory 132 , and may process commands or data stored in the volatile memory 132 , and store the result data in the non-volatile memory 134 .
  • software eg, a program 140
  • the processor 120 converts commands or data received from other components (eg, the sensor module 176 or the communication module 190 ) to the volatile memory 132 .
  • the volatile memory 132 may be stored in the volatile memory 132 , and may process commands or data stored in the volatile memory 132 , and store the result data in the non-volatile memory 134 .
  • the processor 120 is the main processor 121 (eg, a central processing unit or an application processor) or a secondary processor 123 (eg, a graphic processing unit, a neural network processing unit) a neural processing unit (NPU), an image signal processor, a sensor hub processor, or a communication processor).
  • the main processor 121 e.g, a central processing unit or an application processor
  • a secondary processor 123 eg, a graphic processing unit, a neural network processing unit
  • NPU neural processing unit
  • an image signal processor e.g., a sensor hub processor, or a communication processor.
  • the main processor 121 e.g, a central processing unit or an application processor
  • a secondary processor 123 eg, a graphic processing unit, a neural network processing unit
  • NPU neural processing unit
  • an image signal processor e.g., a sensor hub processor, or a communication processor.
  • the main processor 121 e.g, a central processing unit or an application processor
  • a secondary processor 123
  • the auxiliary processor 123 is, for example, on behalf of the main processor 121 while the main processor 121 is in an inactive (eg, sleep) state, or the main processor 121 is active (eg, executing an application). ), together with the main processor 121, at least one of the components of the electronic device 101 (eg, the display module 160, the sensor module 176, or the communication module 190) It is possible to control at least some of the related functions or states.
  • the co-processor 123 eg, an image signal processor or a communication processor
  • may be implemented as part of another functionally related component eg, the camera module 180 or the communication module 190. have.
  • the auxiliary processor 123 may include a hardware structure specialized for processing an artificial intelligence model.
  • Artificial intelligence models can be created through machine learning. Such learning may be performed, for example, in the electronic device 101 itself on which artificial intelligence is performed, or may be performed through a separate server (eg, the server 108).
  • the learning algorithm may include, for example, supervised learning, unsupervised learning, semi-supervised learning, or reinforcement learning, but in the above example not limited
  • the artificial intelligence model may include a plurality of artificial neural network layers.
  • Artificial neural networks include deep neural networks (DNNs), convolutional neural networks (CNNs), recurrent neural networks (RNNs), restricted boltzmann machines (RBMs), deep belief networks (DBNs), bidirectional recurrent deep neural networks (BRDNNs), It may be one of deep Q-networks or a combination of two or more of the above, but is not limited to the above example.
  • the artificial intelligence model may include, in addition to, or alternatively, a software structure in addition to the hardware structure.
  • the memory 130 may store various data used by at least one component of the electronic device 101 (eg, the processor 120 or the sensor module 176 ).
  • the data may include, for example, input data or output data for software (eg, the program 140 ) and instructions related thereto.
  • the memory 130 may include a volatile memory 132 or a non-volatile memory 134 .
  • the program 140 may be stored as software in the memory 130 , and may include, for example, an operating system 142 , middleware 144 , or an application 146 .
  • the input module 150 may receive a command or data to be used in a component (eg, the processor 120 ) of the electronic device 101 from the outside (eg, a user) of the electronic device 101 .
  • the input module 150 may include, for example, a microphone, a mouse, a keyboard, a key (eg, a button), or a digital pen (eg, a stylus pen).
  • the sound output module 155 may 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 can be used for general purposes such as multimedia playback or recording playback.
  • the receiver may be used to receive an incoming call. According to one embodiment, the receiver may be implemented separately from or as part of the speaker.
  • the display module 160 may visually provide information to the outside (eg, a user) of the electronic device 101 .
  • the display module 160 may include, for example, a control circuit for controlling a display, a hologram device, or a projector and a corresponding device.
  • the display module 160 may include a touch sensor configured to sense a touch or a pressure sensor configured to measure the intensity of a force generated by the touch.
  • the audio module 170 may convert a sound into an electric signal or, conversely, convert an electric signal into a sound. According to an embodiment, the audio module 170 acquires a sound through the input module 150 , or an external electronic device (eg, a sound output module 155 ) connected directly or wirelessly with the electronic device 101 . A sound may be output through the electronic device 102 (eg, a speaker or headphones).
  • an external electronic device eg, a sound output module 155
  • a sound may be output through the electronic device 102 (eg, a speaker or headphones).
  • the sensor module 176 detects an operating state (eg, power or temperature) of the electronic device 101 or an external environmental state (eg, user state), and generates an electrical signal or data value corresponding to the sensed state. can do.
  • the sensor module 176 may include, for example, a gesture sensor, a gyro sensor, a barometric pressure sensor, a magnetic sensor, an acceleration sensor, a grip sensor, a proximity sensor, a color sensor, an IR (infrared) sensor, a biometric sensor, It may include a temperature sensor, a humidity sensor, or an illuminance sensor.
  • the interface 177 may support one or more designated protocols that may be used by the electronic device 101 to directly or wirelessly connect with an external electronic device (eg, the electronic device 102 ).
  • 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.
  • HDMI high definition multimedia interface
  • USB universal serial bus
  • SD card interface Secure Digital Card
  • the connection terminal 178 may include a connector through which the electronic device 101 can be physically connected to an external electronic device (eg, the electronic device 102 ).
  • the connection terminal 178 may include, for example, an HDMI connector, a USB connector, an SD card connector, or an audio connector (eg, a headphone connector).
  • the haptic module 179 may convert an electrical signal into a mechanical stimulus (eg, vibration or movement) or an electrical stimulus that the user can perceive through tactile or kinesthetic sense.
  • the haptic module 179 may include, for example, a motor, a piezoelectric element, or an electrical stimulation device.
  • the camera module 180 may capture still images and moving images. According to an embodiment, the camera module 180 may include one or more lenses, image sensors, image signal processors, or flashes.
  • the power management module 188 may manage power supplied to the electronic device 101 .
  • the power management module 188 may be implemented as, for example, at least a part of a power management integrated circuit (PMIC).
  • PMIC power management integrated circuit
  • the battery 189 may supply power to at least one component of the electronic device 101 .
  • battery 189 may include, for example, a non-rechargeable primary cell, a rechargeable secondary cell, or a fuel cell.
  • the communication module 190 is a direct (eg, wired) communication channel or a wireless communication channel between the electronic device 101 and an external electronic device (eg, the electronic device 102, the electronic device 104, or the server 108). It can support establishment and communication performance through the established communication channel.
  • the communication module 190 may include one or more communication processors that operate independently of the processor 120 (eg, an application processor) and support direct (eg, wired) communication or wireless communication.
  • the communication module 190 is a wireless communication module 192 (eg, a cellular communication module, a short-range wireless communication module, or a global navigation satellite system (GNSS) communication module) or a wired communication module 194 (eg, : It may include a LAN (local area network) communication module, or a power line communication module).
  • GNSS global navigation satellite system
  • a corresponding communication module among these communication modules is a first network 198 (eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)) or a second network 199 (eg, legacy It may communicate with the external electronic device 104 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (eg, a telecommunication network such as a LAN or a WAN).
  • a first network 198 eg, a short-range communication network such as Bluetooth, wireless fidelity (WiFi) direct, or infrared data association (IrDA)
  • a second network 199 eg, legacy It may communicate with the external electronic device 104 through a cellular network, a 5G network, a next-generation communication network, the Internet, or a computer network (eg, a telecommunication network such as a LAN or a WAN).
  • a telecommunication network
  • the wireless communication module 192 uses the subscriber information (eg, International Mobile Subscriber Identifier (IMSI)) stored in the subscriber identification module 196 within a communication network such as the first network 198 or the second network 199 .
  • the electronic device 101 may be identified or authenticated.
  • the wireless communication module 192 may support a 5G network after a 4G network and a next-generation communication technology, for example, a new radio access technology (NR).
  • NR access technology includes high-speed transmission of high-capacity data (eMBB (enhanced mobile broadband)), minimization of terminal power and access to multiple terminals (mMTC (massive machine type communications)), or high reliability and low latency (URLLC (ultra-reliable and low-latency) -latency communications)).
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communications
  • URLLC ultra-reliable and low-latency
  • the wireless communication module 192 may support a high frequency band (eg, mmWave band) to achieve a high data rate, for example.
  • a high frequency band eg, mmWave band
  • the wireless communication module 192 includes various technologies for securing performance in a high-frequency band, for example, beamforming, massive multiple-input and multiple-output (MIMO), all-dimensional multiplexing. It may support technologies such as full dimensional MIMO (FD-MIMO), an array antenna, analog beam-forming, or a large scale antenna.
  • the wireless communication module 192 may support various requirements specified in the electronic device 101 , an external electronic device (eg, the electronic device 104 ), or a network system (eg, the second network 199 ).
  • the wireless communication module 192 may include a peak data rate (eg, 20 Gbps or more) for realizing eMBB, loss coverage (eg, 164 dB or less) for realizing mMTC, or U-plane latency for realizing URLLC ( Example: downlink (DL) and uplink (UL) each 0.5 ms or less, or round trip 1 ms or less).
  • a peak data rate eg, 20 Gbps or more
  • loss coverage eg, 164 dB or less
  • U-plane latency for realizing URLLC
  • the antenna module 197 may transmit or receive a signal or power to the outside (eg, an external electronic device).
  • the antenna module 197 may include an antenna including a conductor formed on a substrate (eg, a PCB) or a radiator formed of a conductive pattern.
  • the antenna module 197 may include a plurality of antennas (eg, an array antenna). In this case, at least one antenna suitable for a communication method used in a communication network such as the first network 198 or the second network 199 is connected from the plurality of antennas by, for example, the communication module 190 . can be selected. 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.
  • other components eg, a radio frequency integrated circuit (RFIC)
  • RFIC radio frequency integrated circuit
  • the antenna module 197 may form a mmWave antenna module.
  • the mmWave antenna module comprises a printed circuit board, an RFIC disposed on or adjacent to a first side (eg, bottom side) of the printed circuit board and capable of supporting a designated high frequency band (eg, mmWave band); and a plurality of antennas (eg, an array antenna) disposed on or adjacent to a second side (eg, top or side) of the printed circuit board and capable of transmitting or receiving signals of the designated high frequency band. can do.
  • peripheral devices eg, a bus, general purpose input and output (GPIO), serial peripheral interface (SPI), or mobile industry processor interface (MIPI)
  • GPIO general purpose input and output
  • SPI serial peripheral interface
  • MIPI mobile industry processor interface
  • the command or data may be transmitted or received between the electronic device 101 and the external electronic device 104 through the server 108 connected to the second network 199 .
  • Each of the external electronic devices 102 or 104 may be the same as or different from the electronic device 101 .
  • all or a part of operations executed in the electronic device 101 may be executed in one or more external electronic devices 102 , 104 , or 108 .
  • the electronic device 101 may perform the function or service itself instead of executing the function or service itself.
  • one or more external electronic devices may be requested to perform at least a part of the function or the service.
  • One or more external electronic devices that have received the request may execute at least a part of the requested function or service, or an additional function or service related to the request, and transmit a result of the execution to the electronic device 101 .
  • the electronic device 101 may process the result as it is or additionally and provide it as at least a part of a response to the request.
  • cloud computing distributed computing, mobile edge computing (MEC), or client-server computing technology may be used.
  • the electronic device 101 may provide an ultra-low latency service using, for example, distributed computing or mobile edge computing.
  • the external electronic device 104 may include an Internet of things (IoT) device.
  • Server 108 may be an intelligent server using machine learning and/or neural networks.
  • the external electronic device 104 or the server 108 may be included in the second network 199 .
  • the electronic device 101 may be applied to an intelligent service (eg, smart home, smart city, smart car, or health care) based on 5G communication technology and IoT-related technology.
  • 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 .
  • the charging circuit 210 may include a type of external power source (eg, a power adapter, USB or wireless charging), a size of power that can be supplied from the external power source (eg, about 20 watts or more), or a battery 189 ), a charging method (eg, normal charging or fast charging) may be selected based on at least some of the properties, and the battery 189 may be charged using the selected charging method.
  • the external power source may be connected to the electronic device 101 by wire through, for example, the connection terminal 178 or wirelessly through the antenna module 197 .
  • the power regulator 220 may generate a plurality of powers having different voltages or different current levels by, for example, adjusting a voltage level or a current level of power supplied from an external power source or battery 189 .
  • the power regulator 220 may adjust the external power source or the power of the battery 189 to a voltage or current level suitable for each of some of the components included in the electronic device 101 .
  • 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 may measure usage state information about the battery 189 (eg, the capacity of the battery 189 , the number of times of charging and discharging, a voltage, or a temperature).
  • the power management module 188 may, for example, use the charging circuit 210 , the voltage regulator 220 , or the power gauge 230 , to control the battery 189 based at least in part on the measured usage state information. It is possible to determine charge-related state of charge information (eg, lifespan, overvoltage, undervoltage, overcurrent, overcharge, overdischarge, overheating, short circuit, or swelling). The power management module 188 may determine whether the battery 189 is normal or abnormal based at least in part on the determined state of charge information. When it is determined that the state of the battery 189 is abnormal, the power management module 188 may adjust charging of the battery 189 (eg, decrease charging current or voltage, or stop charging). According to an embodiment, at least some of the functions of the power management module 188 may be performed by an external control device (eg, the processor 120 ).
  • an external control device eg, the processor 120 .
  • the battery 189 may include a battery protection circuit module (PCM) 240 , according to one embodiment.
  • the battery protection circuit 240 may perform one or more of various functions (eg, a pre-blocking function) to prevent deterioration or burnout of the battery 189 .
  • the battery protection circuit 240 is additionally or alternatively, a battery management system (battery management system) capable of performing various functions including cell balancing, capacity measurement of the battery, number of times of charge/discharge measurement, temperature measurement, or voltage measurement. BMS))).
  • At least a portion of the use state information or the charge state information of the battery 189 is a corresponding sensor (eg, a temperature sensor), a power gauge 230 , or a power management module among the sensor modules 276 . (188) can be used.
  • the corresponding sensor (eg, a temperature sensor) of the sensor module 176 is included as a part of the battery protection circuit 140 , or is a separate device to be disposed near the battery 189 . can
  • FIG. 3 is a block diagram illustrating a system 300 including a power transmission device 310 and a power reception device 320 according to an embodiment. 3 illustrates a case in which power is transmitted in an inductive manner.
  • the present invention is not limited thereto, and the system 300 according to the present invention may be applied even when power is transmitted in a resonance manner.
  • the power transmission device 310 may be a power supply device or a charging device.
  • the power receiving device 320 may be a portable electronic device or a wearable electronic device.
  • the power transmitter 310 may wirelessly transmit power to the power receiver 320 .
  • the power receiving device 320 may be wirelessly charged by the power transmitting device 310 .
  • the power transmitting device 310 may be a portable electronic device or a wearable electronic device similar to the power receiving device 320 .
  • the power transmission device 310 includes a power supply unit 311 , a converter 312 , an inverter 313 , a first matching unit 314 , a transmission coil 315 , It may include a control unit 316 , and a first communication circuit 317 .
  • the power supply unit 311 may receive power from the outside.
  • the power supply unit 311 may transfer the input voltage Vin and the input current Iin to the converter 312 .
  • the converter 312 may receive the input voltage Vin and the input current Iin from the power source 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.
  • the inverter 313 may receive the inverter voltage Vinv and the inverter current Iinv from the converter 312 .
  • the inverter 313 may invert the inverter voltage Vinv and the inverter current Iinv to transmit the inverted value to the first matching unit 314 .
  • the inverter 313 may further include a power amplifier (PA) or be replaced with a power amplifier.
  • PA power amplifier
  • the first matching unit 314 may receive the inverter voltage Vinv and the inverter current Iinv from the inverter 313 .
  • the inverter 313 may output an inverter voltage Vinv and an inverter current Iinv converted into alternating current (AC).
  • the first matching unit 314 may transfer the inverter voltage Vinv and the inverter current Iinv converted into alternating current (AC) to the transmitting coil 315 .
  • the first matching unit 314 may compensate 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).
  • INN impedance matching network
  • the transmitting coil 315 may receive an inverted inverter voltage Vinv and an inverter current Iinv from the first matching unit 314 .
  • the transmitting coil 315 may wirelessly transmit power based on the inverted inverter voltage Vinv and the inverter current Iinv.
  • the controller 316 may control the duty of the converter 312 .
  • the duty may mean a ratio of a length of time turned on during a switching operation for controlling turn-on and turn-off of the converter 312 during a specified time period. .
  • Duty may be referred to as a duty cycle (cycle) or a duty ratio (ratio).
  • the controller 316 may control the frequency of the inverter 313 .
  • the frequency of the inverter 313 may be the operating frequency of the power transmission device 310 .
  • the input impedance of the system 300 may be changed. Accordingly, the inverter current Iinv output from the inverter 313 and the inverter power Pinv output from the inverter 313 may be controlled by changing the operating frequency.
  • the controller 316 may be a microprocessor.
  • the first communication circuit 317 may perform wireless communication with the second communication circuit 325 of the power receiving device 320 .
  • the first communication circuit 317 may receive information related to the charging state of the power receiving device 320 .
  • the first communication circuit 317 may receive information related to voltage, current, and/or power of the power receiving device 320 .
  • the first communication circuit 317 may transmit information related to the voltage, current, and/or power of the power receiving device 320 to the controller 316 .
  • the power receiving device 320 includes a receiving coil 321 , a second matching unit 322 , a rectifier 323 , a regulator 324 , a battery 189 , and a second communication unit. It may include a circuit 325 (eg, the wireless communication module 192 of FIG. 1 ), and a sensing circuit 326 .
  • the receiving coil 321 may receive power wirelessly transmitted from the transmitting coil 315 .
  • the receiving coil 321 may transmit the received power to the second matching unit 322 .
  • the second matching unit 322 may receive power from the receiving coil 321 .
  • the second matching unit 322 may transmit power to the rectifier 323 .
  • the second matching unit 322 may adjust or compensate the input impedance seen from the receiving coil 321 of the power receiving device 320 to the load terminal (eg, the battery 189).
  • the second matching unit 322 may be an impedance matching network.
  • 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 transfer the rectified voltage Vrect and the rectified current Irect to the regulator 324 .
  • the regulator 324 may receive the rectified voltage Vrect and the rectified current Irect from the rectifier 323 .
  • the regulator 324 may generate the output voltage Vout and the output current Iout based on the received rectified voltage Vrect and the rectified current Irect.
  • the regulator 324 may transfer the output voltage Vout and the output current Iout to the battery 189 to charge the battery 189 .
  • the battery 189 may serve as a load.
  • the second communication circuit 325 may receive data regarding the rectified voltage Vrect, the rectified current Irect, the output voltage Vout, and the output current Iout.
  • the second communication circuit 325 may perform wireless communication with the power transmission device 310 .
  • 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.
  • a data signal may be transmitted in a power signal.
  • the second communication circuit 325 uses a frequency that is the same as or adjacent to the frequency used for power transmission by the power transmitting device 310 . to communicate with the power transmitter 310 .
  • WPC transmits power using a frequency band of about 100 kHz or more and about 200 kHz or less, and uses a modulation signal of about 1.5 kHz or more and about 2.5 kHz or less to communicate. .
  • Data (or communication signal) generated by the second communication circuit 325 may be transmitted using the receiving coil 321 .
  • the second communication circuit 325 may transmit data to the power transmitter 310 using an amplitude shift keying (ASK) or a frequency shift keying (FSK) modulation technique.
  • ASK amplitude shift keying
  • FSK frequency shift keying
  • data may be transmitted from the power receiving device 320 to the power transmitting device 310 in an ASK method based on load modulation.
  • the second communication circuit 325 may communicate with the power transmitter 310 by changing the frequency of the power signal transmitted through the receiving coil 321 .
  • the second communication circuit 325 may express data by increasing or decreasing the frequency of the power reception signal.
  • the second communication circuit 325 uses a frequency used for power transmission by the power transmitting device 310 . It is possible to communicate with the first communication circuit 317 of the power transmission device 310 using a frequency different from .
  • the communication circuit 325 uses any one of various short-distance communication methods such as Bluetooth (Bluetooth), Bluetooth low energy (BLE), Wi-Fi, and/or near field communication (NFC) for the first communication
  • Information related to the state of charge to the circuit 317 eg, voltage value after rectifier, rectified voltage value (eg, Vrect) information, current information flowing from the receiving coil 321 or the rectifier 323 , various packets, and/or message
  • the second communication circuit 325 may transmit data regarding the rectified voltage Vrect, the rectified current Irect, the output voltage Vout, and the output current Iout to the first communication circuit 317 through wireless communication. have.
  • the sensing circuit 326 includes an input voltage Vin, an input current Iin, an inverter voltage Vinv, an inverter current Iinv, a rectified voltage Vrect, a rectified current Irect, and an output voltage ( Vout), and the output current Iout can be sensed.
  • the sensing circuit 326 may transmit the sensed input voltage Vin and input current Iin to the controller 316 or a micro controller unit (MCU).
  • MCU micro controller unit
  • the control unit 316 or the MCU receiving the input voltage Vin and the input current Iin may calculate the transmission power of the power transmission device 310 .
  • the controller 316 or the MCU may calculate the transmit power of the power transmitter 310 by multiplying the value of the input voltage Vin and the value of the input current Iin.
  • the sensing circuit 326 may transmit a signal including data regarding the output voltage Vout and the output current Iout to the controller 316 or the MCU.
  • the controller 316 or the MCU may calculate the received power of the power receiving device 320 by demodulating the signal.
  • the controller 316 or the MCU may measure the power transmission efficiency of the system 300 by calculating a ratio of the transmission power and the reception power.
  • FIG. 4 is a flowchart 400 illustrating a method for tracking a maximum efficiency operating point using a system (eg, the system 300 of FIG. 3 ) according to an embodiment.
  • the control unit (eg, the control unit 316 of FIG. 3 ) of the system 300 transmits a rectified voltage (eg, the power reception device 320 of FIG. 3 ) transmitted from the power receiving device (eg, the power receiving device 320 of FIG. 3 ).
  • Vrect of FIG. 3 can be obtained.
  • the control unit 316 is a transmitting coil that communicates with a receiving coil (eg, the receiving coil 321 of FIG. 3 )
  • Example: Data regarding the rectified voltage Vrect may be obtained from the transmission coil 315 of FIG. 3 .
  • the control unit 316 communicates with a second communication circuit (eg, the second communication circuit 325 of FIG. 3 ). Data regarding the rectified voltage Vrect may be obtained from the first communication circuit 317 . Since information of the power receiving device 320 can be known through out-of-band communication, it can be applied even when power is transmitted in a resonance method.
  • the controller 316 may determine whether a difference value between the rectified voltage Vrect and the target rectified voltage is equal to or greater than a threshold value.
  • the controller 316 may check whether a difference value between the obtained rectified voltage Vrect of the power receiver 320 and a target rectified voltage to be output from the power receiver 320 is equal to or greater than a threshold value.
  • the controller 316 may determine that the output of the power receiving device 320 is stabilized.
  • the controller 316 may change a first parameter among a plurality of parameters related to power transmission of a transmission coil (eg, the transmission coil 315 of FIG. 3 ).
  • a plurality of parameters related to power transmission may change power transmission efficiency of the transmitting coil 315 .
  • the plurality of parameters related to power transmission may include an inverter voltage (eg, an inverter voltage Vinv of FIG. 3 ), an operating frequency, and a duty cycle.
  • the controller 316 may adjust a second parameter among a plurality of parameters based on a change in the first parameter so that the rectified voltage Vrect is maintained.
  • the rectified voltage Vrect may have a size specified according to a type of a power receiving device (eg, the power receiving device 320 of FIG. 3 ), a rated voltage standard, and/or an international standard for wireless power transmission.
  • the wireless power transmission international standard may be a wireless power consortium (WPC).
  • WPC wireless power consortium
  • the present invention is not limited thereto, and the international standard for wireless power transmission may be a wireless power transmission scheme for transmitting power while maintaining a constant rectified voltage (Vrect).
  • the controller 316 may adjust the second parameter so that the level of the rectified voltage Vrect is maintained despite the change of the first parameter.
  • the controller 316 may calculate the power transmission efficiency of the system 300 after the first parameter and the second parameter are changed. For example, the controller 316 may calculate the power transmission efficiency based on the transmitted power by changing the first parameter and the second parameter and the rectified voltage Vrect received from the power receiving device.
  • control unit 316 may maintain a change direction of the first parameter when the power transmission efficiency increases, and reverse the change direction of the first parameter when the power transmission efficiency decreases.
  • the controller 316 may change the first parameter every first period to track the maximum efficiency point tracking (MEPT) at which the power transmission efficiency is maximized.
  • MEPT maximum efficiency point tracking
  • FIG. 5 is a flowchart 500 illustrating a method for tracking a maximum efficiency operating point using a system (eg, the system 300 of FIG. 3 ) according to an embodiment.
  • the control unit (eg, the control unit 316 of FIG. 3 ) of the system 300 may start with a default inverter voltage value (Start with default Vinv value).
  • the controller 316 may control the inverter (eg, the inverter 313 of FIG. 3 ) to start driving with the initial inverter voltage Vinv.
  • the controller 316 may perform frequency adjustment for target Vrect.
  • the controller 316 may track the operating frequency for the target rectified voltage Vrect through feedback-loop control. When the magnitude of the rectified voltage Vrect increases, the operating frequency may increase.
  • the controller 316 may sense the transmission efficiency. Transmission efficiency may be referred to as rail power (Prail) or received power packet (RPP).
  • Rail power rail power
  • RPP received power packet
  • the controller 316 may measure and store the efficiency.
  • the output may be stabilized.
  • a CEP packet related to wireless power transfer data may be less than or equal to a specific value on a wireless power transfer international standard (WPC) system.
  • WPC wireless power transfer international standard
  • the controller 316 may change the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv.
  • the controller 316 may increase or decrease the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv.
  • the controller 316 may initially increase the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv.
  • the controller 316 may perform frequency adjustment for target Vrect.
  • the controller 316 may adjust the operating frequency so that the rectified voltage Vrect is constantly maintained even when the inverter voltage Vinv changes by the inverter voltage change amount ⁇ Vinv.
  • 5 illustrates a case in which the first parameter among the plurality of parameters is the inverter voltage Vint and the second parameter is the operating frequency.
  • the control unit 316 may detect transmission efficiency in operation 560 .
  • the control unit 316 determines the transmission efficiency Eff_previous before the inverter voltage Vinv changes and the transmission efficiency Eff after the inverter voltage Vinv changes by the inverter voltage change amount ⁇ Vinv. ) can be compared.
  • the transmission efficiency Eff is higher than the transmission efficiency Eff_previous before the inverter voltage Vinv changes (operation 570 - Yes) ) may proceed to operation 540 .
  • the transmission efficiency Eff is lower than the transmission efficiency Eff_previous before the inverter voltage Vinv changes (operation 570 - No ) may proceed to operation 580 .
  • the controller 316 may change the control direction in operation 580 .
  • the controller 316 may add 1 to the value of the factor n that determines the control direction. After changing the factor n that determines the control direction, the controller 316 may proceed to operation 540 .
  • the control unit 316 may maintain the change direction of the inverter voltage Vinv when the transmission efficiency Eff increases compared to the conventional one after the inverter voltage Vinv changes by the inverter voltage change amount ⁇ Vinv. .
  • the control unit 316 increases the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv when the transmission efficiency Eff increases compared to the conventional one after the inverter voltage Vinv changes by the inverter voltage change amount ⁇ Vinv. .
  • the control unit 316 may reverse the change direction of the inverter voltage Vinv when the transmission efficiency Eff decreases compared to the conventional one after the inverter voltage Vinv changes by the inverter voltage change amount ⁇ Vinv.
  • the control unit 316 may reduce the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv when the transmission efficiency Eff decreases compared to the conventional one after the inverter voltage Vinv changes by the inverter voltage change amount ⁇ Vinv. .
  • the controller 316 may change the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv every first period to track the maximum efficiency operating point at which the transmission efficiency is maximized.
  • the controller 316 may repeatedly perform an operation of changing the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv every first period.
  • the controller 316 may track the maximum maximum efficiency operating point while performing an operation of changing the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv for an infinite number of times every first period. For example, when the inverter voltage Vinv at an ideal maximum efficiency operating point is 10.05V, that is, when the inverter voltage Vinv is 10.05V, it may be assumed that the inverter has the maximum efficiency. Also, it may be assumed that the inverter voltage change amount ⁇ Vinv is 0.1V.
  • the inverter voltage Vinv has a value of 10.0V and a value of 10.1V can be repeated indefinitely.
  • the controller 316 may end the operation of changing the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv every first period.
  • the control unit 316 performs an operation of changing the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv every first period, and when the difference value from the inverter voltage Vinv value at the maximum efficiency operating point is less than a threshold value, the inverter The operation of changing the voltage Vinv may be terminated.
  • the inverter voltage Vinv value at the maximum efficiency operating point The threshold value of the difference value can be set to 0.05V.
  • the inverter voltage Vinv starts at 9.0V at the initial time point and reaches a value of 10.0V
  • the operation of changing the inverter voltage Vinv may be terminated.
  • the inverter voltage Vinv starts at 11.0 V at the initial time point and reaches a value of 10.1 V
  • the operation of changing the inverter voltage Vinv may be terminated.
  • the controller 316 may set the direction in which the inverter voltage Vinv changes according to whether the efficiency is increased for each first cycle.
  • the control unit 316 decreases the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv at the time when the next first cycle elapses. have.
  • the controller 316 may decrease the inverter voltage Vinv again when the next first period elapses.
  • the controller 316 may increase the inverter voltage Vinv when the next first period elapses.
  • the inverter voltage Vinv may repeatedly have between two values. In this case, it can be determined that the inverter voltage at the maximum efficiency operating point is between two values.
  • the control unit 316 tracks the maximum efficiency operating point while performing the operation of changing the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv every first period for an infinite number of times, the control unit 316 controls the inverter voltage Vinv It is possible to control to have two values interposed between the inverter voltage Vinv at this maximum efficiency operating point while repeating infinitely.
  • the inverter voltage change amount ⁇ Vinv is to be controlled.
  • the control unit 316 knows two values sandwiching the inverter voltage Vinv at the maximum efficiency operating point, it is close to the inverter voltage Vinv at the maximum efficiency operating point while reducing the magnitude of the inverter voltage change amount ⁇ Vinv. value can be tracked.
  • FIG. 6 is a flowchart 600 illustrating a method for tracking a maximum efficiency operating point using a system (eg, the system 300 of FIG. 3 ) according to an embodiment.
  • the control unit (eg, the control unit 316 of FIG. 3 ) of the system 300 may start with a reference frequency value (Start with default Freq value).
  • the controller 316 may control the inverter (eg, the inverter 313 of FIG. 3 ) to start driving at the initial driving frequency Freq.
  • the controller 316 may adjust the inverter voltage Vinv for the target rectified voltage (Vinv adjustment for target Vrect).
  • the controller 316 may track the inverter voltage Vinv for the target rectified voltage Vrect through feedback-loop control. When the magnitude of the rectified voltage Vrect increases, the inverter voltage Vinv may increase.
  • the controller 316 may sense a sensing efficiency.
  • Efficiency may be transmission efficiency. Transmission efficiency may be referred to as rail power (Prail) or RPP.
  • Rail power Rail power
  • the controller 316 may measure and store the efficiency.
  • the output may be stabilized.
  • a CEP packet related to wireless power transfer data may be less than or equal to a specific value on a wireless power transfer international standard (WPC) system.
  • WPC wireless power transfer international standard
  • the controller 316 may change the driving frequency Freq by the driving frequency change amount ⁇ Freq.
  • the controller 316 may increase or decrease the driving frequency Freq by the driving frequency change amount ⁇ Freq.
  • the controller 316 may adjust the inverter voltage Vinv for the target rectified voltage (Vinv adjustment for target Vrect).
  • the controller 316 may adjust the inverter voltage Vinv so that the rectified voltage Vrect is maintained constant even when the driving frequency Freq is changed by the driving frequency change amount ⁇ Freq. 6 illustrates a case in which a first parameter among a plurality of parameters is an operating frequency and a second parameter is an inverter voltage Vint.
  • the control unit 316 may detect the efficiency in operation 660 .
  • the control unit 316 controls the transmission efficiency Eff_previous before the driving frequency Freq is changed and the transmission efficiency Eff after the driving frequency Freq is changed by the driving frequency variation ⁇ Freq. ) can be compared.
  • the driving frequency Freq changes by the driving frequency change amount ⁇ Freq the transmission efficiency Eff is higher than the transmission efficiency Eff_previous before the driving frequency Freq changes (operation 670 - Yes ) may proceed to operation 640 .
  • the driving frequency Freq is changed by the driving frequency change amount ⁇ Freq and the transmission efficiency Eff is lower than the transmission efficiency Eff_previous before the driving frequency Freq is changed (operation 670 - No ) may proceed to operation 680 .
  • the controller 316 may change the control direction in operation 680 .
  • the controller 316 may add 1 to the value of the factor n that determines the control direction. After changing the factor n that determines the control direction, the controller 316 may proceed to operation 640 .
  • the control unit 316 may maintain the change direction of the driving frequency Freq when the transmission efficiency Eff increases compared to the conventional one after the driving frequency Freq changes by the driving frequency change amount ⁇ Freq. .
  • the controller 316 may increase the driving frequency change amount ⁇ Freq by the driving frequency change amount ⁇ Freq when the transmission efficiency Eff increases compared to the existing one after the driving frequency Freq changes by the driving frequency change amount ⁇ Freq.
  • the controller 316 may reverse the change direction of the driving frequency Freq when the transmission efficiency Eff is reduced compared to the existing one after the driving frequency Freq is changed by the driving frequency change amount ⁇ Freq.
  • the control unit 316 may reduce the driving frequency Freq by the driving frequency change amount ⁇ Freq when the transmission efficiency Eff decreases compared to the conventional one after the driving frequency Freq changes by the driving frequency change amount ⁇ Freq. .
  • the control unit 316 may change the driving frequency Freq by the driving frequency change amount ⁇ Freq every first period to track the maximum efficiency operating point at which the transmission efficiency is maximized.
  • the controller 316 may repeatedly perform an operation of changing the driving frequency Freq by the driving frequency change amount ⁇ Freq every first period.
  • the control unit 316 may track the maximum maximum efficiency operating point while performing the operation of changing the driving frequency Freq by the driving frequency change amount ⁇ Freq for an infinite number of times every first period. For example, when the driving frequency Freq at the ideal maximum efficiency operating point is 150.05 KHz, that is, when the driving frequency Freq is 150.05 KHz, it may be assumed to have the maximum efficiency. Also, it may be assumed that the driving frequency change amount ⁇ Freq is 0.1 KHz.
  • the driving frequency Freq is a value of 150.0KHz and a value of 150.1KHz can be repeated indefinitely.
  • the controller 316 may end the operation of changing the driving frequency Freq by the driving frequency change amount ⁇ Freq every first period.
  • the control unit 316 performs an operation of changing the driving frequency Freq by the driving frequency change amount ⁇ Freq every first period, and drives when the difference value from the driving frequency Freq value at the maximum efficiency operating point is less than or equal to a threshold value
  • the operation of changing the frequency Freq may be terminated.
  • the driving frequency Freq is 150.05 KHz, the maximum efficiency is achieved and the driving frequency change amount ⁇ Freq is 0.1 KHz
  • the threshold value of the difference value can be set to 0.05KHz.
  • the operation of changing the driving frequency Freq may be terminated.
  • the driving frequency Freq starts at 140 KHz at the initial time point and reaches a value of 150.0 KHz
  • the operation of changing the driving frequency Freq may be terminated.
  • the driving frequency Freq starts at 160 KHz at the initial time point and reaches a value of 150.1 KHz
  • the operation of changing the driving frequency Freq may be terminated.
  • the controller 316 may set the direction in which the driving frequency Freq changes according to whether the efficiency is increased in each first cycle.
  • the control unit 316 may decrease the driving frequency Freq by the driving frequency change amount ⁇ Freq at the time when the next first period elapses. have.
  • the controller 316 may decrease the driving frequency Freq again when the next first period elapses.
  • the controller 316 may increase the driving frequency Freq when the next first period elapses.
  • the driving frequency Freq may repeatedly have between two values. In this case, it can be determined that the driving frequency at the maximum efficiency operating point is between two values.
  • the control unit 316 tracks the maximum efficiency operating point while performing the operation of changing the driving frequency Freq by the driving frequency change amount ⁇ Freq every first period for an infinite number of times, the control unit 316 controls the driving frequency Freq It is possible to control so that two values with the driving frequency Freq at the maximum efficiency operating point therebetween are repeated infinitely.
  • the driving frequency change amount ⁇ Freq is to be controlled.
  • the control unit 316 knows two values interposed between the driving frequency Freq at the maximum efficiency operating point, the control unit 316 is close to the driving frequency Freq at the maximum efficiency operating point while reducing the magnitude of the driving frequency change ⁇ Freq. value can be tracked.
  • FIG. 7 is a graph 700 illustrating that an inverter voltage change amount (eg, an inverter voltage change amount ⁇ Vinv of FIG. 5 ) is constantly maintained according to a comparative example.
  • an inverter voltage change amount eg, an inverter voltage change amount ⁇ Vinv of FIG. 5
  • the first graph 710 may represent an inverter voltage Vinv(V) over time.
  • the inverter voltage Vinv(V) may change by the inverter voltage change amount ⁇ Vinv having a constant magnitude for each first period.
  • the second graph 720 may represent the power transmission efficiency (%) of a system (eg, the system 300 of FIG. 3 ) over time.
  • the power transfer efficiency (%) of the system 300 may have a maximum efficiency operating point 730 .
  • the first voltage level 711 that is the magnitude of the inverter voltage Vinv(V) at the maximum efficiency operating point 730 may be calculated.
  • the number of changes and the time it takes to track the maximum efficiency operating point 730 may increase.
  • the inverter voltage (Vinv(V)) is changed by the inverter voltage change amount ( ⁇ Vinv), which is a constant magnitude for each first cycle, the maximum efficiency operating point 730 can be tracked through 15 iteration changes. have.
  • FIG. 8 is a graph 800 illustrating adjustment of an inverter voltage change amount ⁇ Vinv based on the efficiency of a system (eg, the system 300 of FIG. 3 ) according to an exemplary embodiment.
  • the first graph 810 may represent an inverter voltage Vinv(V) over time.
  • the inverter voltage Vinv(V) may change by the inverter voltage change amount ⁇ Vinv for each first period.
  • the second graph 820 may represent the power transmission efficiency (%) of a system (eg, the system 300 of FIG. 3 ) over time.
  • the power transfer efficiency (%) of the system 300 may have a maximum efficiency operating point 830 .
  • the first voltage level 811 that is the magnitude of the inverter voltage Vinv(V) at the maximum efficiency operating point 830 may be calculated.
  • control unit eg, the control unit 316 of FIG. 3
  • the control unit 316 is configured to compare the power transfer efficiency ( %), the ratio ( ⁇ / ⁇ Vinv) of the change amount ( ⁇ ) can be calculated.
  • the control unit 316 may calculate the ratio ( ⁇ / ⁇ Vinv) of the inverter voltage change amount ( ⁇ Vinv) at the time of measurement and the change amount ( ⁇ ) of the power transmission efficiency (%) of the system 300 .
  • the controller 316 may calculate the ratio ( ⁇ / ⁇ Vinv) of the inverter voltage change amount ( ⁇ Vinv) and the change amount ( ⁇ ) of the power transmission efficiency (%) of the system 300 in real time.
  • the control unit 316 calculates the ratio ( ⁇ / ⁇ Vinv) of the change amount ( ⁇ ) of the power transfer efficiency (%) of the system 300 compared to the inverter voltage change amount ( ⁇ Vinv) in the first time range 801 in the first ratio ( A1) can be calculated.
  • the first ratio A1 may be about 2.
  • the control unit 316 calculates the ratio ( ⁇ / ⁇ Vinv) of the change amount ( ⁇ ) of the power transfer efficiency (%) of the system 300 compared to the inverter voltage change amount ( ⁇ Vinv) in the second time range (802) in the second ratio ( A2) can be calculated.
  • the second ratio A2 may be about 1.5.
  • the control unit 316 calculates the ratio ( ⁇ / ⁇ Vinv) of the change amount ( ⁇ ) of the power transfer efficiency (%) of the system 300 with the inverter voltage change amount ( ⁇ Vinv) in the third time range 803 in the third ratio ( A3) can be calculated.
  • the third ratio A3 may be about 1.
  • the control unit 316 may determine whether the ratio ( ⁇ / ⁇ Vinv) of the calculated inverter voltage change amount ⁇ Vinv and the change amount ⁇ of the power transmission efficiency (%) of the system 300 corresponds to a specific value.
  • the control unit 316 may determine whether the ratio ( ⁇ / ⁇ Vinv) of the calculated inverter voltage change amount ⁇ Vinv and the change amount ⁇ of the power transmission efficiency (%) of the system 300 is within a specific range.
  • the control unit 316 multiplies each of the calculated ratios A1, A2, and A3 by the reference inverter voltage change amount ⁇ Vdefault in each of the plurality of time ranges 801, 802, and 803, the inverter voltage It can be set as the amount of change ( ⁇ Vinv).
  • the controller 316 may set a value obtained by multiplying the reference inverter voltage variation ⁇ Vdefault by the first ratio A1 in the first time range 801 as the inverter voltage variation ⁇ Vinv.
  • the controller 316 may set a value obtained by multiplying the reference inverter voltage variation ⁇ Vdefault by the second ratio A2 in the second time range 802 as the inverter voltage variation ⁇ Vinv.
  • the controller 316 may set a value obtained by multiplying the reference inverter voltage variation ⁇ Vdefault by the third ratio A3 in the third time range 803 as the inverter voltage variation ⁇ Vinv.
  • the inverter voltage Vinv(V) when the inverter voltage Vinv(V) is changed by the inverter voltage change amount ⁇ Vinv having a magnitude that is dynamically changed every first period, it takes until the number of changes and the maximum efficiency operating point 830 are tracked time may be reduced.
  • the inverter voltage (Vinv(V)) is changed by the inverter voltage change amount ( ⁇ Vinv) having a magnitude that is dynamically changed every first period
  • the maximum efficiency operating point 830 through 9 iteration changes. can be tracked.
  • the inverter voltage Vinv(V) is set to have a dynamically changing magnitude in FIG. 8
  • the present invention is not limited thereto, and the driving frequency may be set to have a dynamically changing magnitude.
  • FIG. 9 is a graph 900 illustrating adjustment of maximum efficiency operating point tracking periods T1 and T2 based on the efficiency of a system (eg, the system 300 of FIG. 3 ) according to an exemplary embodiment.
  • the first graph 910 may represent an inverter voltage Vinv(V) over time.
  • the inverter voltage Vinv(V) may change by the inverter voltage change amount ⁇ Vinv having a constant magnitude for each maximum efficiency operating point tracking period T1 and T2.
  • the second graph 920 may represent the power transmission efficiency (%) of the system 300 over time.
  • the power transfer efficiency (%) of the system 300 may have a maximum efficiency operating point 930 .
  • the first voltage level 911 that is the magnitude of the inverter voltage Vinv(V) at the maximum efficiency operating point 930 may be calculated.
  • the control unit determines the change amount ⁇ of the power transmission efficiency (%) of the system 300 over time in each of the plurality of time ranges 901 and 902 . can be calculated.
  • the controller 316 may calculate the maximum efficiency operating point tracking period T1 and T2 according to the change amount ⁇ of the power transmission efficiency (%) of the system 300 according to time.
  • the control unit 316 sets the maximum efficiency operating point tracking period as the first period T1 based on the change amount ⁇ of the power transmission efficiency (%) of the system 300 over time in the first time range 901 .
  • the first period T1 may be about 50 ms.
  • the control unit 316 sets the maximum efficiency operating point tracking period to the second period T2 based on the change amount ⁇ of the power transmission efficiency (%) of the system 300 over time in the second time range 902 .
  • the second period T2 may be about 100 ms.
  • the controller 316 changes the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv for each maximum efficiency operating point tracking period T1 and T2 set in each of the plurality of time ranges 901 and 902 . can do it
  • the controller 316 may change the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv for each first period T1 in the first time range 901 .
  • the controller 316 may change the inverter voltage Vinv by the inverter voltage change amount ⁇ Vinv every second period T2 in the second time range 902 .
  • the time required to track the maximum efficiency operating point 930 may be reduced.
  • the maximum efficiency operating point tracking period (T1, T2) that changes the inverter voltage (Vinv(V)) is dynamically changed, 15 iteration changes are performed faster to achieve the maximum efficiency operating point (930). ) can be traced.
  • the period for changing the inverter voltage Vinv(V) is dynamically set in FIG. 9 , but the present invention is not limited thereto, and the period for changing the driving frequency may be dynamically set.
  • 10 is a graph showing adjusting the inverter voltage change amount ( ⁇ Vinv) and the maximum efficiency operating point tracking period (T1, T2) based on the efficiency of the system (eg, the system 300 of FIG. 3 ) according to an embodiment ( 1000).
  • the first graph 1010 may represent an inverter voltage Vinv(V) over time.
  • the inverter voltage Vinv(V) may change by the inverter voltage change amount ⁇ Vinv for each first period.
  • the second graph 1020 may represent the power transmission efficiency (%) of a system (eg, the system 300 of FIG. 3 ) over time.
  • the power transfer efficiency (%) of the system 300 may have a maximum efficiency operating point 1030 .
  • the first voltage level 1011 that is the magnitude of the inverter voltage Vinv(V) at the maximum efficiency operating point 1030 may be calculated.
  • control unit eg, the control unit 316 in FIG. 3
  • the control unit 316 in FIG. 3 is configured to compare the power transfer efficiency ( %), calculating the ratio ( ⁇ / ⁇ Vinv) of the change ( ⁇ ) of the maximum efficiency operating point tracking period (T1 , T2) can be calculated
  • the control unit 316 is a plurality of time ranges ( 1001 , 1002 , 1003 ) the ratio of the change amount ( ⁇ ) of the power transfer efficiency (%) of the system 300 compared to the inverter voltage change amount ( ⁇ Vinv) ( While varying the magnitude of the inverter voltage change amount ⁇ Vinv according to ⁇ / ⁇ Vinv), at the same time, the maximum efficiency operating point tracking period T1 according to the change amount ⁇ of the power transfer efficiency (%) of the system 300 over time , T2) can be changed.
  • the controller 316 may simultaneously change the magnitude of the inverter voltage variation ⁇ Vinv and the maximum efficiency operating point tracking periods T1 and T2 to more quickly track the maximum efficiency operating point 1030 .
  • the power transmission device 310 includes a power supply unit (eg, the power supply unit 311 of FIG. 3 ), a converter (eg, the converter 312 of FIG. 3 ), and an inverter (eg, the inverter 313 of FIG. 3 ). , a transmission coil (eg, the transmission coil 315 of FIG. 3 ), and a control unit (eg, the control unit 316 of FIG. 3 ).
  • the control unit 316 obtains a rectified voltage (eg, the rectified voltage Vrect of FIG. 3 ) from the power receiving device (eg, the power receiving device 320 of FIG. 3 ), and is related to power transmission of the transmitting coil 315 .
  • Change the first parameter among the plurality of parameters check whether a difference value between the rectified voltage Vrect and the target rectified voltage is greater than or equal to a threshold value, and maintain the rectified voltage Vrect when the difference value is greater than or equal to the threshold value
  • Adjusts a second parameter among a plurality of parameters based on the change of the first parameter calculates the power transmission efficiency of the system 300 after the first parameter and the second parameter change, and when the power transmission efficiency increases, the second parameter
  • the plurality of parameters may include an inverter voltage (eg, an inverter voltage Vinv of FIG. 3 ), an operating frequency (eg, an operating frequency Freq of FIG. 5 ), and a duty cycle.
  • an inverter voltage eg, an inverter voltage Vinv of FIG. 3
  • an operating frequency eg, an operating frequency Freq of FIG. 5
  • a duty cycle e.g., a duty cycle
  • the first parameter may be an inverter voltage Vinv
  • the second parameter may be an operating frequency Freq.
  • the first parameter may be an operating frequency Freq
  • the second parameter may be an inverter voltage Vinv.
  • the controller 316 may dynamically change the amount of change of the first parameter in each of a plurality of time ranges (eg, a plurality of time ranges 801 , 802 , and 803 of FIG. 8 ).
  • control unit 316 controls ratios of the amount of change in the power transmission efficiency of the system 300 compared to the amount of change of the first parameter in each of the plurality of time ranges 801 , 802 , and 803 (eg, FIG. calculate each of the first rate (A1), the second rate (A2), and/or the third rate (A3) of 8, and the reference amount of change in each of the plurality of time ranges 801, 802, 803 (eg : A value obtained by multiplying the reference inverter voltage variation (Vdefault) of FIG. 8 by each of the calculated ratios A1, A2, and A3 may be set as the variation amount of the first parameter.
  • Vdefault reference inverter voltage variation
  • control unit 316 controls the first period (eg, the first period T1 of FIG. 9 ) over a plurality of time ranges (eg, a plurality of time ranges 901 and 902 of FIG. 9 )). Each can be changed dynamically.
  • the controller 316 calculates a change in the power transmission efficiency of the system 300 over time in each of the plurality of time ranges 901 and 902 , and the power transmission efficiency of the system 300 over time
  • the maximum efficiency operating point tracking period is calculated as the first period T1 or a second period different from the first period T1 (eg, the second period T2 in FIG. 9 ) according to the amount of change of , and a plurality of times
  • the first parameter may be changed by the first parameter change amount for each first period T1 or second period T2 set in each of the ranges 901 and 902 .
  • it further includes a communication circuit (eg, the first communication circuit 317 of FIG. 2 ) for wirelessly communicating in-band or out-of-band, wherein the control unit 315 is It may be configured to acquire data regarding the rectified voltage Vrect.
  • a communication circuit eg, the first communication circuit 317 of FIG. 2
  • the control unit 315 may be configured to acquire data regarding the rectified voltage Vrect.
  • the rectified voltage Vrect may have a size specified according to the type of the power receiving device 320 , a rated voltage standard, and/or an international standard for wireless power transmission.
  • the maximum efficiency operating point tracking method using the system 300 including the power transmitting device 310 and the power receiving device 320 includes obtaining a rectified voltage Vrect from the power receiving device 320 .
  • An operation eg, operation 410 of FIG. 4
  • an operation of determining whether a difference value between the rectified voltage Vrect and the target rectified voltage is equal to or greater than a threshold value eg, operation 420 of FIG. 4
  • an operation of determining whether the difference value is greater than or equal to the threshold value In the case of an operation of changing a first parameter among a plurality of parameters related to power transmission of the transmitting coil 315 (eg, operation 430 of FIG.
  • An operation of adjusting the second parameter among the parameters of eg, operation 440 of FIG. 4
  • an operation of calculating the power transmission efficiency of the system 300 after the first parameter and the second parameter are changed eg, operation 440 of FIG. 4 ) operation 450
  • maintaining the change direction of the first parameter when the power transmission efficiency increases eg, operation 460 of FIG. 4
  • reversely setting the change direction of the first parameter when the power transmission efficiency decreases eg, operation 460 of FIG. 4
  • the first It may include an operation (eg, operation 470 of FIG. 4 ) of tracking a maximum efficiency operating point at which power transmission efficiency is maximized by changing a parameter every first period.
  • the operation of tracking the maximum efficiency operating point may include an operation of dynamically changing the amount of change of the first parameter in each of the plurality of time ranges 801 , 802 , and 803 .
  • the operation of tracking the maximum efficiency operating point is a measure of the power transfer efficiency of the system 300 compared to the amount of change of the first parameter in each of the plurality of time ranges 801 , 802 , 803 .
  • An operation of calculating each of the rates of change A1, A2, and A3, and each of the rates A1, A2, and A3 calculated for the reference change amount Vdefault in each of the plurality of time ranges 801, 802, and 803 It may include an operation of setting the multiplied value by the change amount of the first parameter.
  • the operation of tracking the maximum efficiency operating point may include dynamically changing the first period in each of the plurality of time ranges 901 and 902 .
  • the operation of tracking the maximum efficiency operating point is an operation of calculating the amount of change in the power transmission efficiency of the system 300 over time in each of the plurality of time ranges 901 and 902 , in time Calculating the maximum efficiency operating point tracking period as a first period (T1) or a second period (T2) different from the first period (T1) according to the amount of change in the power transmission efficiency of the system 300 according to an operation, and a plurality of times
  • the operation may include changing the first parameter by the amount of change of the first parameter for each first period T1 or second period T2 set in each of the ranges 901 and 902 .
  • the operation of obtaining the rectified voltage Vrect includes obtaining data regarding the rectified voltage Vrect from the communication circuit 317 for wirelessly communicating in-band or out-of-band.
  • the electronic device may have various types of devices.
  • the electronic device may include, for example, a portable communication device (eg, a smart phone), a computer device, a portable multimedia device, a portable medical device, a camera, a wearable device, or a home appliance device.
  • a portable communication device eg, a smart phone
  • a computer device e.g., a smart phone
  • a portable multimedia device e.g., a portable medical device
  • a camera e.g., a portable medical device
  • a camera e.g., a portable medical device
  • a camera e.g., a portable medical device
  • a wearable device e.g., a smart bracelet
  • a home appliance device e.g., a home appliance
  • first, second, or first or second may be used simply to distinguish the element from other elements in question, and may refer to elements in other aspects (e.g., importance or order) is not limited. It is said that one (eg, first) component is “coupled” or “connected” to another (eg, second) component, with or without the terms “functionally” or “communicatively”. When referenced, it means that one component can be connected to the other component directly (eg by wire), wirelessly, or through a third component.
  • module used in various embodiments of this document may include a unit implemented in hardware, software, or firmware, and is interchangeable with terms such as, for example, logic, logic block, component, or circuit.
  • a module may be an integrally formed part or a minimum unit or a part of the part that performs one or more functions.
  • the module may be implemented in the form of an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • one or more instructions stored in a storage medium may be implemented as software (eg, the program 140) including
  • a processor eg, processor 120
  • a device eg, electronic device 101
  • the one or more instructions may include code generated by a compiler or code executable by an interpreter.
  • the device-readable storage medium may be provided in the form of a non-transitory storage medium.
  • 'non-transitory' only means that the storage medium is a tangible device and does not contain a signal (eg, electromagnetic wave), and this term refers to the case where data is semi-permanently stored in the storage medium and It does not distinguish between temporary storage cases.
  • a signal eg, electromagnetic wave
  • the method according to various embodiments disclosed in this document may be provided as included in a computer program product.
  • Computer program products may be traded between sellers and buyers as commodities.
  • the computer program product is distributed in the form of a machine-readable storage medium (eg compact disc read only memory (CD-ROM)), or via an application store (eg Play StoreTM) or on two user devices ( It can be distributed online (eg download or upload), directly between smartphones (eg smartphones).
  • a part of the computer program product may be temporarily stored or temporarily generated in a machine-readable storage medium such as a memory of a server of a manufacturer, a server of an application store, or a relay server.
  • each component (eg, module or program) of the above-described components may include a singular or a plurality of entities, and some of the plurality of entities may be separately disposed in other components. have.
  • one or more components or operations among the above-described corresponding components may be omitted, or one or more other components or operations may be added.
  • a plurality of components eg, a module or a program
  • the integrated component may perform one or more functions of each component of the plurality of components identically or similarly to those performed by the corresponding component among the plurality of components prior to the integration. .
  • operations performed by a module, program, or other component are executed sequentially, in parallel, repeatedly, or heuristically, or one or more of the operations are executed in a different order, or omitted. or one or more other operations may be added.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Un dispositif de transmission de puissance peut être divulgué. Le dispositif de transmission de puissance peut comprendre : une unité d'alimentation ; un convertisseur ; un onduleur ; une bobine de transmission ; et une unité de commande. L'unité de commande peut être conçue pour obtenir une tension redressée transférée d'un redresseur à un régulateur, modifier un premier paramètre parmi une pluralité de paramètres liés à la transmission de puissance de la bobine de transmission, déterminer si une valeur de différence entre la tension redressée et une tension redressée cible est supérieure ou égale à une valeur seuil, ajuster un second paramètre parmi la pluralité de paramètres sur la base d'un changement dans le premier paramètre de telle sorte que la tension redressée est maintenue lorsque la valeur de différence est supérieure ou égale à la valeur seuil, calculer l'efficacité de transmission de puissance d'un système après que le premier paramètre et le second paramètre ont changé, maintenir une direction de changement du premier paramètre lorsque l'efficacité de transmission de puissance augmente, régler la direction de changement du premier paramètre à l'inverse lorsque l'efficacité de transmission de puissance diminue, et suivre un point de fonctionnement à efficacité maximale auquel l'efficacité de transmission de puissance du système est maximisée en changeant le premier paramètre à chaque première période. Divers autres modes de réalisation identifiés dans la description sont possibles.
PCT/KR2021/016369 2020-11-25 2021-11-10 Dispositif de transmission de puissance et procédé de suivi de point de fonctionnement à efficacité maximale d'un système comprenant ledit dispositif de transmission de puissance et un dispositif de réception de puissance WO2022114615A1 (fr)

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WO2023243817A1 (fr) * 2022-06-15 2023-12-21 삼성전자주식회사 Dispositif de transmission d'énergie sans fil, dispositif de réception d'énergie sans fil et procédé de fonctionnement associé
WO2024063430A1 (fr) * 2022-09-22 2024-03-28 삼성전자 주식회사 Dispositif électronique pour déterminer une tension de sortie d'un convertisseur et transmettre sans fil de l'énergie, et son procédé de fonctionnement
KR20240102479A (ko) * 2022-12-26 2024-07-03 주식회사 반프 무선전력 송수신 시스템 및 무선전력 송수신 방법

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