WO2024070004A1 - Système de transmission d'énergie sans fil, système de transmission d'énergie, système de réception d'énergie, dispositif de transmission d'énergie, dispositif de réception d'énergie, et satellite de production d'énergie solaire dans l'espace - Google Patents

Système de transmission d'énergie sans fil, système de transmission d'énergie, système de réception d'énergie, dispositif de transmission d'énergie, dispositif de réception d'énergie, et satellite de production d'énergie solaire dans l'espace Download PDF

Info

Publication number
WO2024070004A1
WO2024070004A1 PCT/JP2023/005518 JP2023005518W WO2024070004A1 WO 2024070004 A1 WO2024070004 A1 WO 2024070004A1 JP 2023005518 W JP2023005518 W JP 2023005518W WO 2024070004 A1 WO2024070004 A1 WO 2024070004A1
Authority
WO
WIPO (PCT)
Prior art keywords
power
transmission
power transmission
wireless power
frequency
Prior art date
Application number
PCT/JP2023/005518
Other languages
English (en)
Japanese (ja)
Inventor
直輝 長谷川
悠太 中本
昂 平川
Original Assignee
ソフトバンク株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ソフトバンク株式会社 filed Critical ソフトバンク株式会社
Publication of WO2024070004A1 publication Critical patent/WO2024070004A1/fr

Links

Images

Classifications

    • 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
    • H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • 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
    • H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems

Definitions

  • the present invention relates to wireless power transmission (WPT).
  • Patent Document 1 discloses a power supply system that includes a power transmission system (power transmission device) in space that transmits electrical energy as a microwave beam, and a power receiving system (power receiving device) on the ground that receives the microwave beam transmitted from the power transmission system.
  • a power transmission system power transmission device
  • a power receiving system power receiving device
  • the system according to the first aspect of the present invention is a system for wireless power transmission.
  • This system is mounted on a floating body located at a predetermined altitude and includes a plurality of power transmitting devices that transmit transmission signals for wireless power transmission via electromagnetic waves of a predetermined frequency, and one or more power receiving devices that output electric power by phase-combining a plurality of received signals that receive the plurality of transmission signals transmitted from the plurality of power transmitting devices.
  • the power receiving device may transmit a pilot signal to the power transmitting devices, and the power transmitting devices may be time-synchronized with each other, and may determine the transmission timing of the transmission signal for wireless power transmission based on the reception result of the pilot signal received from the power receiving device so that the transmission signals for wireless power transmission transmitted from the power transmitting devices reach the power receiving device in phase.
  • the frequency of the electromagnetic waves may be 300 GHz or less.
  • the electromagnetic waves may be microwaves.
  • the electromagnetic waves may be beam-shaped electromagnetic waves formed to have a directionality from the power transmitting device to the power receiving device.
  • the float may be a HAPS, a balloon, or a drone located in the stratosphere.
  • the power receiving device may be located on land, sea or lake, or in space at a lower altitude than the power transmitting device.
  • the power transmission device is a power transmission device for wireless power transmission.
  • This power transmission device is mounted on a levitation body located at a predetermined altitude, and includes a transmission unit that transmits a transmission signal for wireless power transmission via electromagnetic waves of a predetermined frequency.
  • the power transmission device may include a synchronization processing unit that performs time synchronization with other power transmission devices that have a common power transmission target, and the transmission unit may determine the transmission timing of the transmission signal for wireless power transmission based on the reception result of a pilot signal received from the power receiving device so that the transmission signals for wireless power transmission transmitted from the multiple power transmission devices arrive at the power receiving device in the same phase.
  • the power transmission system includes a plurality of the power transmission devices.
  • the power receiving device is a power receiving device for wireless power transmission.
  • This power receiving device includes a receiving unit that receives transmission signals for wireless power transmission via electromagnetic waves of a predetermined frequency from a plurality of power transmitting devices each mounted on a levitation body located at a predetermined altitude, and a combining unit that combines a plurality of received signals in phase that have received the plurality of transmission signals.
  • the power receiving device may include a transmission unit that transmits pilot signals to the multiple power transmitting devices.
  • the system according to the second aspect of the present invention is a system for wireless power transmission.
  • This system includes a power transmitting device mounted on a floating body located at a predetermined altitude, which receives a transmission signal for wireless power transmission from an external device via electromagnetic waves of a first frequency, converts the frequency of the transmission signal for wireless power transmission to a second frequency lower than the first frequency, and transmits the transmission signal for wireless power transmission via electromagnetic waves of the second frequency, and a power receiving device which receives the transmission signal transmitted from the power transmitting device and outputs electric power.
  • the electromagnetic wave of the first frequency may be a millimeter wave, a terahertz wave, or a light wave
  • the electromagnetic wave of the second frequency may be a microwave
  • the electromagnetic waves of the first frequency may be beam-shaped electromagnetic waves formed to have a directivity from an external device toward the power transmitting device
  • the electromagnetic waves of the second frequency may be beam-shaped electromagnetic waves formed to have a directivity from the power transmitting device toward the power receiving device.
  • the external device may be a space solar power satellite located in space outside the atmosphere, and the floating body may be a HAPS, a balloon, or a drone located in the stratosphere.
  • the power receiving device may be located on land, sea or lake, or in space at a lower altitude than the power transmitting device.
  • the power transmission device is a power transmission device for wireless power transmission.
  • This power transmission device is mounted on a floating body located at a predetermined altitude, and includes a receiving unit that receives a transmission signal for wireless power transmission via electromagnetic waves of a first frequency, a converting unit that converts the frequency of the transmission signal for wireless power transmission to a second frequency that is lower than the first frequency, and a transmitting unit that transmits the transmission signal for wireless power transmission via electromagnetic waves of the second frequency.
  • the system according to the third aspect of the present invention is a system for wireless power transmission.
  • This system includes a space solar power generation satellite located at an altitude higher than the atmosphere and transmitting multiple wireless power transmission transmission signals in multiple beams via electromagnetic waves of a predetermined frequency, and multiple power receiving devices mounted on multiple floating bodies located at a predetermined altitude lower than the space solar power generation satellite and receiving each of the multiple wireless power transmission transmission signals transmitted in multiple beams from the space solar power generation satellite.
  • the electromagnetic waves may be millimeter waves, terahertz waves, or light waves.
  • the float may be a HAPS, a balloon, or a drone located in the stratosphere.
  • the space solar power satellite according to the third aspect of the present invention is located at an altitude higher than the atmosphere and includes a transmitter that transmits multiple transmission signals for wireless power transmission in multiple beams via electromagnetic waves of a predetermined frequency to multiple power receiving devices mounted on multiple floating bodies located at a predetermined altitude lower than the space solar power satellite.
  • the power receiving device is a power receiving device for wireless power transmission.
  • This power receiving device is mounted on each of a plurality of floating bodies located at a predetermined altitude lower than the space solar power generation satellite, and includes a receiving unit that receives a transmission signal for wireless power transmission transmitted from the space solar power generation satellite via electromagnetic waves of a predetermined frequency.
  • the wireless power transmission power receiving system includes a plurality of the power receiving devices.
  • the present invention enables stable wireless power transmission from a power transmitting device located at a high altitude to a power receiving device.
  • FIG. 1 is an explanatory diagram illustrating an example of a schematic configuration of a system according to a first embodiment.
  • FIG. 2 is a block diagram showing an example of a main configuration of a HAPS and a base station that configure the wireless power transmission (WPT) system of the first embodiment.
  • FIG. 3A is a graph showing a composite signal when the phase between the received signals at the base station due to the respective transmitted signals from multiple HAPSs is not aligned.
  • FIG. 3B is a graph showing a combined signal when the phases between the signals received at the base station due to the respective transmission signals from multiple HAPSs are matched (when phase combined).
  • FIG. 4 is an explanatory diagram showing an example of a method for combining phases so that the phases of a plurality of received signals are matched.
  • FIG. 5 is an explanatory diagram illustrating an example of a schematic configuration of a system according to the second embodiment.
  • FIG. 6 is a block diagram showing an example of a main configuration of a HAPS and a base station that configure a wireless power transmission (WPT) system according to the second embodiment.
  • FIG. 7 is an explanatory diagram illustrating an example of a schematic configuration of a system according to the third embodiment.
  • FIG. 8 is a block diagram showing an example of a main configuration of a HAPS constituting a wireless power transmission (WPT) system according to the third embodiment.
  • a wireless power transmission (WPT) system is a large-space distributed power supply system capable of stably supplying power from multiple power transmitting devices mounted on multiple floating bodies (e.g., HAPS, balloons, drones) located in a distributed manner in the stratosphere or other locations in the sky to power receiving devices located on the ground, sea, lakes, etc., or to power receiving devices mounted on drones located in low-altitude space.
  • multiple floating bodies e.g., HAPS, balloons, drones
  • FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a system according to the first embodiment.
  • the system of the first embodiment is a system for wireless power transmission (WPT), and includes a plurality of power transmitting devices mounted on levitating bodies located at a predetermined altitude, and one or more power receiving devices. Each of the plurality of power transmitting devices transmits a transmission signal for wireless power transmission via electromagnetic waves of a predetermined frequency.
  • the one or more power receiving devices output power by phase-combining a plurality of received signals that are received from the plurality of power transmitting devices mounted on the respective levitating bodies.
  • the floating body is, for example, a HAPS, a balloon, or a drone.
  • a high-altitude platform station HAPS (also called a "high-altitude pseudo satellite") 10
  • HAPS 10 is equipped with a communication relay device, is located in an airspace at a predetermined altitude, and forms a three-dimensional cell (three-dimensional area) in a cell formation target airspace at the predetermined altitude.
  • the airspace in which HAPS 10 is located is, for example, a stratospheric airspace with an altitude of 11 km or more and 50 km or less.
  • This airspace may be an airspace with an altitude of 15 km or more and 25 km or less where the weather conditions are relatively stable, and may particularly be an airspace with an altitude of approximately 20 km.
  • the cell formation target airspace may be above the sea, a river, or a lake.
  • the relay communication device of HAPS10 forms a beam toward the ground for wireless communication with a terminal device, which is a mobile station.
  • the terminal device may be a communication terminal module built into a drone, which is an aircraft such as a small remote-controlled helicopter, or it may be a user device used by a user inside an airplane (aircraft).
  • the relay communication device of HAPS10 is connected to the core network of the mobile communication network via a feeder station, which is a relay station located on land, sea, or lake. Communication between HAPS10 and the feeder station may be performed by wireless communication using radio waves such as microwaves, or by optical communication using laser light, etc.
  • HAPS10 may autonomously control its own flight movement and processing at the relay communication station by executing a control program with a control unit configured as an internally built computer or the like. For example, HAPS10 may acquire its own current position information (e.g., GPS (Global Positioning System) position information), pre-stored position control information (e.g., flight schedule information), position information of other HAPS located in the vicinity, and the like, and autonomously control its flight movement and processing at the relay communication device based on that information.
  • GPS Global Positioning System
  • the flight movement of HAPS10 and the processing by the relay communication device may be controlled by a remote control device acting as a management device provided in a communication center of a mobile communication network or the like.
  • Communication between HAPS10 and the remote control device is performed by a HAPS control communication station which is a facility on land or sea.
  • the HAPS control communication station preferably uses an omnidirectional antenna so that it can accommodate multiple HAPS10, but a directional antenna may also be used.
  • a GCS Gate Control System
  • ground control station may be used as such a HAPS control communication station.
  • the wireless communication between HAPS10 and the HAPS control communication station requires high reliability and low latency, since it includes communication for controlling the flight movement of HAPS10 and cell optimization. Therefore, it is preferable to use a frequency band for the wireless communication between HAPS10 and the HAPS control communication station that is lower than the frequency band used for wireless communication via the feeder link of mobile communication between HAPS10 and the feeder station. For example, if a gigahertz (GHz) frequency band is used for the wireless communication between HAPS10 and the feeder station, a megahertz (MHz) frequency band is used for the wireless communication between HAPS10 and the HAPS control communication station.
  • GHz gigahertz
  • MHz megahertz
  • HAPS10 may incorporate a control communication terminal device (e.g., a mobile communication module) so that it can receive control information from the remote control device, and may be assigned terminal identification information (e.g., an IP address, a telephone number, etc.) so that it can be identified by the remote control device.
  • terminal identification information e.g., an IP address, a telephone number, etc.
  • the MAC address of the communication interface may be used to identify the control communication terminal device.
  • HAPS10 may also transmit information such as information regarding the flight movement of itself or surrounding HAPS, processing by relay communication devices, and observation data acquired by various sensors, etc., to a specified destination such as a remote control device.
  • the power receiving device is a power supply target that is supplied with power by wireless power transmission (WPT) from a power transmitting device on HAPS10, and is not particularly limited.
  • WPT wireless power transmission
  • it is a power receiving device located on the ground, sea or lake (e.g., a mobile communication base station, mobile station, or other facility device), or a power receiving device located in space at a low altitude lower than the position of HAPS10 (e.g., another HAPS, a balloon, a drone, an airplane (aircraft), or other floating object).
  • This embodiment is an example in which a mobile communication base station 20 installed on the ground is used as the power receiving device.
  • the base station 20 is equipped with, for example, multiple array antennas 210 having many antenna elements, and can communicate with multiple terminal devices (for example, UEs (mobile stations) for mobile communication and IoT devices, hereinafter also referred to as "UEs 20") using a massive MIMO (hereinafter also referred to as "mMIMO") transmission method.
  • mMIMO is a wireless transmission technology that realizes large-capacity, high-speed communication by transmitting and receiving data using the array antennas 210.
  • communication can be performed using a MU (Multi User)-MIMO transmission method that performs beamforming, which forms beams for each of the multiple UEs 20 in a time-division or simultaneous manner.
  • MU Multi User
  • communication can be performed by directing an appropriate beam to each UE 20 according to the communication environment of each UE 20, thereby improving the communication quality of the entire cell.
  • communication with multiple UEs 20 can be performed using the same wireless resources (time and frequency resources), thereby expanding the system capacity.
  • FIG. 2 is a block diagram showing an example of the main configuration of the HAPS 10 and the base station 20 that constitute the wireless power transmission (WPT) system of the first embodiment.
  • the HAPS 10 includes a communication relay device 100 as a power transmitting device and an antenna 110.
  • the antenna 110 is, for example, an array antenna having a large number of antenna elements. There may be a single antenna 110 or multiple antennas 110. For example, multiple antennas 110 may be arranged corresponding to multiple sector cells.
  • the communication relay device 100 includes a communication signal processing unit 120, a wireless processing unit 130, a power transmission control unit 140, and a NW communication unit 150.
  • the communication signal processing unit 120 processes signals such as control information transmitted and received between the base station 20.
  • the wireless processing unit 130 transmits a transmission signal generated by the communication signal processing unit 120 from the antenna 110 to the base station 20, and outputs a received signal received from the base station 20 via the antenna 110 to the communication signal processing unit 120.
  • the power transmission control unit 140 sends control information from the base station 20 to the communication signal processing unit 120, and generates a control signal (BF control signal) for wireless power transmission beamforming (WPT beamforming) of the array antenna 110 based on the control information and sends it to the wireless processing unit 130.
  • the communication signal processing unit 120 generates a downlink (DL) transmission signal including a WPT signal based on the control information received from the power transmission control unit 140 and sends it to the wireless processing unit 130.
  • DL downlink
  • the power transmission control unit 140 may transfer information received from the base station 20 to the NW communication unit 150, receive control information generated by the external platform 55 based on that information from the NW communication unit 150, and generate a downlink (DL) transmission signal including a WPT signal and a BF control signal based on the control information.
  • DL downlink
  • the NW communication unit 150 is connected to the communication network 50 via a wireless communication line, and can communicate with a cloud system, a server, etc. of the external platform 55.
  • the NW communication unit 150 can transmit communication data or information received from the base station 20 to the communication network 50 side, and can also receive communication data or information to be transmitted to the base station 20 from the communication network 50 side.
  • the NW communication unit 150 is a communication unit that communicates with, for example, a feeder station located on the ground.
  • HAPS10 may perform beamforming (BF) control to form individual beams for each base station 20 or for each target area to which multiple base stations 20 belong during downlink communication with the base stations 20, and may perform wireless power transmission for each base station 20 or for each target area.
  • the BF control for each base station 20 or for each target area may be performed by digital BF control in the frequency domain in the communication signal processing unit 120, or may be performed by analog BF control in the wireless processing unit 130.
  • the base station 20 includes an antenna 210, a wireless processing unit 220, a communication signal processing unit 230, a power output unit 240, and a battery 250.
  • the antenna 210 is, for example, composed of a plurality of array antennas having a large number of antenna elements.
  • the wireless processing unit 220 transmits information and transmission signals generated by the communication signal processing unit 230 from the antenna 210 to the HAPS 10, and outputs received signals received from the HAPS 10 via the antenna 210 to the communication signal processing unit 230.
  • the wireless processing unit 220 receives a transmission signal for wireless power transmission transmitted from HAPS10.
  • the power output unit 240 has, for example, a rectifier, and outputs the power of the received signal that receives the transmission signal for wireless power transmission from HAPS10 as received power for charging the battery.
  • the battery 250 can be charged by the received power output from the power output unit 240.
  • the wireless processing unit 220 may have a function to measure or acquire information related to power reception, such as power reception beam information (e.g., information on the direction and width of the power reception beam) and information on the direction of arrival of the WPT radio waves.
  • the power output unit 240 may have a function to measure the received power. At least one of the information related to power reception, such as power reception beam information, information on the direction of arrival of the WPT radio waves, information on the received power, and control information, can be included in the information to the HAPS 10.
  • the frequency of the electromagnetic waves of the transmission signal for wireless power transmission sent from HAPS 10 to base station 20 is preferably 300 GHz or less, and is more preferably microwaves.
  • electromagnetic waves, particularly microwaves, which are less susceptible to the influence of the atmosphere, are preferred.
  • the system obtains power (total power) from a composite signal that combines received signals generated at the base station 20 with transmission signals for wireless power transmission from multiple HAPS 10.
  • FIG. 4 is an explanatory diagram showing an example of a method for combining phases so that the phases of a plurality of received signals are matched.
  • Examples of methods for synthesizing phases so that the phases of multiple received signals are a method for adjusting the phase of a transmission signal for wireless power transmission transmitted from multiple HAPS 10-0, 10-1, ..., 10-n, and a method for adjusting the phase of multiple received signals received by the base station 20.
  • the latter phase adjustment method requires equipment changes and setting changes to existing base stations 20 that are not compatible with this system, and when phase adjustment is performed at the power-receiving base station 20, the transmission power is reduced by the amount of power consumption required for the phase adjustment, so the former phase adjustment method is preferable.
  • the former phase adjustment method is adopted, which adjusts the phase of the transmission signal for wireless power transmission transmitted from multiple HAPS 10-0, 10-1, ... 10-n.
  • input phases ⁇ 1, ⁇ 2, ... ⁇ n that compensate for the transmission signal path difference between multiple HAPS 10-0, 10-1, ... 10-n are added to the transmission signals of HAPS 10-1, ... 10-n other than the reference HAPS 10-0, so that the received signals at the base station 20 are in phase.
  • a specific phase adjustment method may, for example, adjust the phase of a transmission signal for wireless power transmission transmitted from multiple HAPS 10-0, 10-1, ... 10-n based on feedback information regarding wireless power transmission from base station 20.
  • multiple HAPS 10-0, 10-1, ... 10-n receive and acquire feedback information regarding wireless power transmission from base station 20 via a communication UL established between each HAPS and base station 20.
  • the feedback information may include, for example, power receiving device information regarding power reception at base station 20 (also referred to as "WPT power receiving information,” "WPT terminal information,” or "WPT information").
  • the power receiving device information may include, for example, at least one of the following information: request information requesting wireless power transmission (WPT request), identification information for identifying the base station 20, location information of the base station 20, received power information at the base station 20, power receiving beam information at the base station 20 (e.g., information on the direction, width, etc. of the power receiving beam), information on the direction of arrival of the WPT radio waves at the base station 20, remaining battery charge information in the base station 20, and approval information approving wireless power transmission.
  • WPT request request information requesting wireless power transmission
  • identification information for identifying the base station 20 location information of the base station 20, received power information at the base station 20, power receiving beam information at the base station 20 (e.g., information on the direction, width, etc. of the power receiving beam), information on the direction of arrival of the WPT radio waves at the base station 20, remaining battery charge information in the base station 20, and approval information approving wireless power transmission.
  • Feedback information (FB information) from the base station 20 received by the array antenna 110 of HAPS10 is sent to the communication control unit 115 of the communication relay device 100.
  • the communication control unit 115 generates control information based on the feedback information from the base station 20, and based on the control information, generates a downlink (DL) transmission signal including a wireless power transmission signal (WPT signal) and a control signal (BF control signal) for wireless power transmission beamforming (WPT beamforming) of the array antenna 110 of HAPS10, and sends them to the array antenna 110.
  • DL downlink
  • WPT signal wireless power transmission signal
  • BF control signal control signal for wireless power transmission beamforming
  • the array antenna 110 forms a wireless power transmission beam (WPT beam) in the direction of the base station 20 based on the BF control signal, and transmits a downlink (DL) transmission signal (phase-adjusted transmission signal) including a WPT signal via a portion of the wireless resources of the downlink (DL).
  • WPT beam wireless power transmission beam
  • DL downlink
  • DL downlink
  • the communication control unit 115 of HAPS10 may transfer feedback information received from the base station 20 to a cloud system or server of the external platform 55, receive control information generated by the external platform 55 based on the feedback information, and generate a downlink (DL) transmission signal including a WPT signal and a BF control signal based on the control information.
  • DL downlink
  • the feedback information regarding wireless power transmission from the base station 20 may be control information that specifies the phase of the transmission signal for each HAPS 10. In this case, however, the base station 20 executes a process for determining the phase of the transmission signal transmitted from each HAPS 10.
  • a pilot signal is transmitted from the base station 20 to multiple HAPS 10-0, 10-1, ... 10-n that are time-synchronized with each other, and the multiple HAPS 10-0, 10-1, ... 10-n determine the transmission timing of the transmission signal based on the reception result of the pilot signal from the base station 20 so that the transmission signals for wireless power transmission arrive at the base station 20 in the same phase.
  • the power transmission control unit 140 functions as a synchronization processing unit that performs time synchronization with other HAPSs that share the same power transmission target (base station 20), and performs time synchronization using, for example, PTP (Precision Time Protocol) or the like. Furthermore, the power transmission control unit 140, together with the wireless processing unit 130 and antenna 110, etc., constitutes a transmission unit that transmits a transmission signal for wireless power transmission via electromagnetic waves of a predetermined frequency.
  • the power transmission control unit 140 can ascertain the difference in transmission signal path length from the reference HAPS10-0 based on the reception time of the pilot signal, and therefore determines input phases ⁇ 1, ⁇ 2, ..., ⁇ n to compensate for this difference, and sends control information for the transmission timing of the transmission signal to which the determined input phases have been added to the wireless processing unit 130.
  • the wireless processing unit 130 transmits a transmission signal for wireless power transmission (a transmission signal after phase adjustment) from the antenna 110 to the base station 20 with a transmission timing based on that control information.
  • the transmission signals P In e j ⁇ , P In e j ⁇ - ⁇ 1 , ..., P In e j ⁇ - ⁇ n input to the antennas 110 of the multiple HAPS 10-0, 10-1, ..., 10-n have the same phase P r e j ⁇ when received by the base station 20. Therefore, as shown in Fig. 3B, the phase-combined received signal (combined signal) P rInc is maximized, and highly efficient and stable wireless power transmission (WPT) is realized.
  • WPT wireless power transmission
  • a wireless power transmission (WPT) system is a large-space distributed power supply system capable of stably supplying power from a Space Solar Power Satellite (SSPS) to a power receiving device located on the ground, sea, lake, etc., or a power receiving device mounted on a drone located in low-altitude space, by relaying power from the Space Solar Power Satellite (SSPS) through a plurality of power transmitting devices mounted on a plurality of floating bodies (e.g., HAPS, balloons, drones) located in a distributed manner in the stratosphere, etc.
  • SSPS Space Solar Power Satellite
  • FIG. 5 is an explanatory diagram showing an example of a schematic configuration of a system according to the second embodiment.
  • the system of the second embodiment is a system for wireless power transmission (WPT), and includes one or more power transmitting devices mounted on a levitation body located at a predetermined altitude, and a power receiving device that receives a transmission signal transmitted from the power transmitting device and outputs electric power.
  • the one or more power transmitting devices receive a transmission signal for wireless power transmission transmitted from an external device via electromagnetic waves of a first frequency, convert the frequency of the transmission signal for wireless power transmission to a second frequency lower than the first frequency, and transmit the transmission signal for wireless power transmission via the electromagnetic waves of the second frequency.
  • the floating body is an example of HAPS10 located in the stratosphere, but may be a balloon or a drone, as in the above-mentioned embodiment 1.
  • the receiving device is also an example of a terrestrial base station 20, as in the above-mentioned embodiment 1.
  • the transmission signal for wireless power transmission transmitted by HAPS10 in this embodiment 2 to the base station 20 is a transmission signal for wireless power transmission transmitted from an external device, the frequency of which is converted to a lower frequency.
  • this external device include a power transmission device mounted on another floating body (e.g., another HAPS), a power transmission device located on the ground, sea or lake, and a power transmission device located at a higher altitude than HAPS10 (e.g., a space solar power generation satellite).
  • the external device is an example of a space solar power generation satellite 30 located at an altitude higher than the atmosphere.
  • the space solar power generation satellite 30 is equipped with a solar power generation device, and transmits power output from the solar power generation device to a HAPS 10 in the stratosphere via wireless power transmission, and the power is then transmitted from the HAPS 10 to a ground base station 20, which is a power receiving device, via wireless power transmission.
  • FIG. 6 is a block diagram showing an example of the main configuration of the HAPS 10 and the base station 20 that constitute the wireless power transmission (WPT) system of the second embodiment.
  • the HAPS 10 includes an antenna 111 as a receiving unit that receives a transmission signal for wireless power transmission from the space solar power satellite 30 transmitted via electromagnetic waves of a first frequency, and a frequency conversion unit 160 as a conversion unit that converts the frequency of the transmission signal for wireless power transmission received by the antenna 111 to a lower second frequency.
  • the antenna 111 is, for example, an array antenna having a large number of antenna elements. There may be a single antenna 111 or multiple antennas.
  • the frequency conversion unit 160 provided in the communication relay device 100 of the HAPS 10 converts the frequency (first frequency) of the transmission signal for wireless power transmission received from the space solar power generation satellite 30 via the antenna 111 to a lower second frequency, and sends the frequency-converted transmission signal to the wireless processing unit 130.
  • the wireless processing unit 130 transmits the transmission signal for wireless power transmission sent from the frequency conversion unit 160 from the antenna 110 to the base station 20.
  • the frequency of the electromagnetic waves of the transmission signal for wireless power transmission transmitted from the space solar power generation satellite 30 to the HAPS 10 is preferably higher than microwaves, and more preferably millimeter waves, terahertz waves, or light waves. Since the influence of the atmosphere is small between the space solar power generation satellite 30, which is located at an altitude higher than the atmosphere, and the HAPS 10, which is located in the stratosphere, the electromagnetic waves of the transmission signal for wireless power transmission are preferably high-frequency, particularly millimeter waves, terahertz waves, or light waves.
  • the transmission signal for wireless power transmission transmitted from the HAPS 10, which is located in the stratosphere, to the ground base station 20 is greatly influenced by the atmosphere, so as described above, it is preferable that the electromagnetic waves, particularly microwaves, are less influenced by the atmosphere.
  • wireless power transmission when transmitting power generated by a space solar power generation satellite 30 to a ground base station 20 wirelessly, wireless power transmission (WPT) is achieved by passing the power through a HAPS 10 located in the stratosphere. That is, in areas with little atmospheric influence, the transmission signal for wireless power transmission is transmitted via higher frequency electromagnetic waves, and in areas with great atmospheric influence, the transmission signal for wireless power transmission is transmitted via lower frequency electromagnetic waves, thereby achieving highly efficient and stable wireless power transmission (WPT).
  • WPT wireless power transmission
  • the electromagnetic waves of the transmission signal for wireless power transmission sent from the space solar power satellite 30 to the HAPS 10 are electromagnetic waves in a beam shape formed to have directivity from the space solar power satellite 30 toward the HAPS 10. This makes it possible to achieve more efficient wireless power transmission.
  • electromagnetic waves for example, electromagnetic waves whose beam shape has been shaped by beamforming technology can be used.
  • the space solar power satellite 30 transmits transmission signals for wireless power transmission to multiple HAPS 10, it is preferable to transmit the multiple transmission signals to each HAPS 10 in a multi-beam manner. This makes it possible to achieve more efficient wireless power transmission to each HAPS 10.
  • wireless power transmission is performed from multiple HAPS 10 to the base station 20. Therefore, as in the above-described embodiment 1, it is preferable to adopt a configuration that performs phase synthesis so that the phases of multiple received signals received from the transmission signals for wireless power transmission sent from the multiple HAPS 10 are consistent. However, in this embodiment 2, it is not necessarily necessary to adopt this configuration.
  • a wireless power transmission (WPT) system is a large-space distributed power supply system capable of stably supplying power from a space solar power satellite (SSPS) to a plurality of floating bodies (e.g., HAPS, balloons, drones) located in a distributed manner in the stratosphere or the like.
  • SSPS space solar power satellite
  • FIG. 7 is an explanatory diagram showing an example of a schematic configuration of a system according to the third embodiment.
  • the system of the third embodiment is a system for wireless power transmission (WPT), and includes a space solar power generation satellite 30 located at an altitude higher than the atmosphere, and a plurality of power receiving devices mounted on each of a plurality of floating bodies located at a predetermined altitude lower than the space solar power generation satellite.
  • the space solar power generation satellite 30 transmits a plurality of transmission signals for wireless power transmission in multiple beams via electromagnetic waves of a predetermined frequency.
  • the multiple power receiving devices receive each of the plurality of transmission signals for wireless power transmission transmitted in multiple beams from the space solar power generation satellite 30.
  • the space solar power satellite 30 is located at an altitude higher than the atmosphere, is equipped with a solar power generation device, and transmits power output from the solar power generation device to the HAPS 10 in the stratosphere by wireless power transmission.
  • the receiving device in this embodiment 3 is the HAPS 10, which is a floating body, and the power transmission target of this system is the HAPS 10. Therefore, the HAPS 10 in this embodiment 3 does not have a function (such as the power transmission control unit 140) for wireless power transmission to the terrestrial base station 20, but may have a function for wireless power transmission to the terrestrial base station 20.
  • the floating body on which the power receiving device to be transmitted is mounted is an example of a HAPS10 located in the stratosphere, but it may also be a balloon or drone located in the stratosphere, as in the first and second embodiments described above.
  • FIG. 8 is a block diagram showing an example of a main configuration of a HAPS 10 constituting a wireless power transmission (WPT) system according to the third embodiment.
  • the HAPS 10 of the present embodiment 3 differs from the above-mentioned embodiment 2 in that it does not include functions (such as a power transmission control unit 140 and a frequency conversion unit 160) for wirelessly transmitting power to a ground base station 20.
  • the HAPS 10 of the present embodiment 3 also differs from the above-mentioned embodiment 2 in that it includes a wireless processing unit 170, a power output unit 180, and a battery 190.
  • the wireless processing unit 170 receives the transmission signal for wireless power transmission transmitted from the space solar power satellite 30 via the antenna 111 and sends it to the power output unit 180.
  • the power output unit 180 has, for example, a rectifier, and outputs the power of the received signal that receives the transmission signal for wireless power transmission from the space solar power satellite 30 as received power for charging the battery.
  • the battery 190 can be charged by the received power output from the power output unit 180.
  • the frequency of the electromagnetic waves of the transmission signal for wireless power transmission transmitted from the space solar power generation satellite 30 to the HAPS 10 is preferably higher than microwaves, and more preferably millimeter waves, terahertz waves, or light waves. Since the influence of the atmosphere is small between the space solar power generation satellite 30, which is located at an altitude higher than the atmosphere, and the HAPS 10, which is located in the stratosphere, the electromagnetic waves of the transmission signal for wireless power transmission are preferably high-frequency, particularly millimeter waves, terahertz waves, or light waves.
  • the space solar power satellite 30 transmits transmission signals for wireless power transmission to multiple HAPS 10
  • the multiple transmission signals are transmitted to each HAPS 10 as multiple beams. This allows for more efficient wireless power transmission to each HAPS 10.
  • Such multiple beams can be realized, for example, by forming the beam shape using beam forming technology.
  • multiple transmission signals for wireless power transmission are transmitted in multiple beams from the space solar power generation satellite 30, and the multiple transmission signals transmitted in multiple beams are received by multiple HAPS 10s located in different locations in the stratosphere, etc. This makes it possible to realize highly efficient and stable wireless power transmission (WPT).
  • WPT wireless power transmission
  • the present invention can stabilize wireless power transmission from a transmission device located at a high altitude to a receiving device located on the ground, sea, lake, or in space at a low altitude, thereby contributing to the achievement of Goal 9 of the Sustainable Development Goals (SDGs), which is to "build resilient infrastructure, promote industry, innovation and infrastructure.”
  • SDGs Sustainable Development Goals
  • processing steps described in this specification and components of the wireless power transmission system, power transmission system, power receiving system, power transmitting device, power receiving device, levitation body, terminal device, space solar power satellite, etc. can be implemented by various means.
  • these steps and components may be implemented by hardware, firmware, software, or a combination thereof.
  • the processing units and other means used to realize the above steps and components in an entity may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processors (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein, computers, or combinations thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processors
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • processors controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein, computers, or combinations thereof.
  • the means such as processing units used to realize the above components may be implemented with programs (e.g., code such as procedures, functions, modules, instructions, etc.) that perform the functions described herein.
  • programs e.g., code such as procedures, functions, modules, instructions, etc.
  • any computer/processor readable medium tangibly embodying firmware and/or software code may be used to implement the means such as processing units used to realize the above steps and components described herein.
  • the firmware and/or software code may be stored in a memory and executed by a computer or processor, for example in a control device.
  • the memory may be implemented inside the computer or processor or external to the processor.
  • the firmware and/or software code may also be stored in a computer or processor readable medium, such as, for example, random access memory (RAM), read only memory (ROM), non-volatile random access memory (NVRAM), programmable read only memory (PROM), electrically erasable programmable read only memory (EEPROM), flash memory, floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage device, etc.
  • RAM random access memory
  • ROM read only memory
  • NVRAM non-volatile random access memory
  • PROM programmable read only memory
  • EEPROM electrically erasable programmable read only memory
  • flash memory floppy disk, compact disk (CD), digital versatile disk (DVD), magnetic or optical data storage device, etc.
  • CD compact disk
  • DVD digital versatile disk
  • magnetic or optical data storage device etc.
  • the code may be executed by one or more computers or processors and may cause the computers or processors to perform certain aspects of the functionality described herein.
  • the medium may also be a non-transitory recording medium.
  • the program code may be in any format as long as it can be read and executed by a computer, processor, or other device or machine, and the format is not limited to a specific format.
  • the program code may be any of source code, object code, and binary code, or may be a mixture of two or more of these codes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système permettant de transmettre de l'énergie, sans fil et de façon stable, d'un dispositif de transmission d'énergie positionné à une altitude élevée à un dispositif de réception d'énergie. Le système comprend : une pluralité de dispositifs de transmission d'énergie (100) montés sur des corps flottants (10) positionnés à des altitudes prédéterminées et transmettant des signaux de transmission pour une transmission sans fil d'énergie, par l'intermédiaire d'une onde électromagnétique de fréquence prédéterminée ; et au moins un dispositif de réception d'énergie (20) combinant une pluralité de signaux de réception en phase, lesdits signaux de réception étant obtenus par réception de la pluralité de signaux de transmission transmis par la pluralité de dispositifs de transmission d'énergie, et émettant en sortie l'énergie. La fréquence de l'onde électromagnétique peut être inférieure ou égale à 300 [GHz], et l'onde électromagnétique peut être une micro-onde. L'onde électromagnétique peut présenter une forme de faisceau dont la directivité est dirigée vers le dispositif de réception d'énergie à partir du dispositif de transmission d'énergie. Les corps flottants peuvent être des plateformes à haute altitude (PHA) positionnées dans la stratosphère, des ballons ou des drones. Le dispositif de réception d'énergie peut être positionné au sol, sur la mer ou sur un lac, ou peut être positionné dans un espace dont l'altitude est inférieure à celle du dispositif de transmission d'énergie.
PCT/JP2023/005518 2022-09-30 2023-02-16 Système de transmission d'énergie sans fil, système de transmission d'énergie, système de réception d'énergie, dispositif de transmission d'énergie, dispositif de réception d'énergie, et satellite de production d'énergie solaire dans l'espace WO2024070004A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022158858A JP7369844B1 (ja) 2022-09-30 2022-09-30 無線電力伝送システム、送電システム、受電システム、送電装置、受電装置及び宇宙太陽光発電衛星
JP2022-158858 2022-09-30

Publications (1)

Publication Number Publication Date
WO2024070004A1 true WO2024070004A1 (fr) 2024-04-04

Family

ID=88418643

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/005518 WO2024070004A1 (fr) 2022-09-30 2023-02-16 Système de transmission d'énergie sans fil, système de transmission d'énergie, système de réception d'énergie, dispositif de transmission d'énergie, dispositif de réception d'énergie, et satellite de production d'énergie solaire dans l'espace

Country Status (2)

Country Link
JP (1) JP7369844B1 (fr)
WO (1) WO2024070004A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004266929A (ja) * 2003-02-28 2004-09-24 Mitsubishi Electric Corp 太陽光エネルギー収集伝送システム
JP2005319853A (ja) * 2004-05-07 2005-11-17 Mitsubishi Electric Corp 衛星、地球局
JP2011142708A (ja) * 2010-01-05 2011-07-21 Mitsubishi Electric Corp 無線電力伝送システム、電力送信装置及びレクテナ基地局

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022058853A (ja) * 2022-02-02 2022-04-12 克弥 西沢 空中構造物

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004266929A (ja) * 2003-02-28 2004-09-24 Mitsubishi Electric Corp 太陽光エネルギー収集伝送システム
JP2005319853A (ja) * 2004-05-07 2005-11-17 Mitsubishi Electric Corp 衛星、地球局
JP2011142708A (ja) * 2010-01-05 2011-07-21 Mitsubishi Electric Corp 無線電力伝送システム、電力送信装置及びレクテナ基地局

Also Published As

Publication number Publication date
JP7369844B1 (ja) 2023-10-26
JP2024052265A (ja) 2024-04-11

Similar Documents

Publication Publication Date Title
US11962390B2 (en) Methods, apparatus and system for extended wireless communications
US9571180B2 (en) Unmanned aerial vehicle (UAV) beam forming and pointing toward ground coverage area cells for broadband access
US10530429B2 (en) Process and apparatus for communicating with a user antenna
WO2020202817A1 (fr) Configuration de multiples liaisons de connexion dans un système de communication haps, et commande associée
US10135510B2 (en) Means of improving data transfer
JP7372179B2 (ja) 回転翼航空機における広帯域アンテナシステムのコンポーネント
US20220069449A1 (en) Unmanned aerial vehicle antenna configurations
WO2019012894A1 (fr) Antenne optique directionnelle compatible 3d
Miura et al. Preliminary flight test program on telecom and broadcasting using high altitude platform stations
WO2019235324A1 (fr) Utilisation efficace d'une ressource d'onde radio utilisée pour une liaison de connexion pour des haps, et optimisation de cellule pour des haps
US10659146B2 (en) Methods and apparatus for airborne synthetic antennas
Tuzi et al. Satellite swarm-based antenna arrays for 6G direct-to-cell connectivity
WO2019135369A1 (fr) Correction de retard de transmission/propagation de site à site pendant l'application d'une diversité de site dans une liaison de connexion haps
WO2021084592A1 (fr) Dispositif de traitement d'informations, dispositif de communication, procédé de traitement d'informations, procédé de communication, programme de traitement d'informations, et programme de communication
WO2019235329A1 (fr) Optimisation de cellule utilisant une commande à distance sur un circuit de communication de commande de vol pour des haps
WO2019151055A1 (fr) Système de fourniture d'énergie sans fil à un véhicule aérien
US11876293B1 (en) Array wall slot antenna for phased array calibration
WO2020195270A1 (fr) Détection d'interférence entre des liaisons multialimentations dans un système de communication de type haps
WO2024070004A1 (fr) Système de transmission d'énergie sans fil, système de transmission d'énergie, système de réception d'énergie, dispositif de transmission d'énergie, dispositif de réception d'énergie, et satellite de production d'énergie solaire dans l'espace
WO2021002044A1 (fr) Procédé de détection et d'inhibition d'interférences de communication de liaison aller dans une liaison montante de système de communication type plateforme à haute altitude
US12040555B1 (en) Peripheral antenna placement for calibration for a phased array antenna
US11641067B1 (en) Passive antenna elements used to fill gaps in a paneltzed phased array antenna
US11296409B1 (en) Embedded antenna for calibration for a phased array antenna
Albagory An adaptive bidirectional multibeam high-altitude platforms aeronautical telecommunication network using dual concentric conical arrays
JP2017092814A (ja) アンテナ・アレイ、基地局、無線通信システム及び通信装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23871253

Country of ref document: EP

Kind code of ref document: A1