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CN-115149665-B - Wireless power transmission device and power transmission system for transmitting power to aerial mobile body

CN115149665BCN 115149665 BCN115149665 BCN 115149665BCN-115149665-B

Abstract

In a wireless power transmission device and a power transmission system for transmitting power to an airborne mobile unit, radio waves cannot be radiated with high accuracy in a direction in which the airborne mobile unit exists, and efficiency of wireless power transmission is lowered. A wireless power transmission device (1A) is provided with a power transmission antenna (30), a radiation direction determination unit (208), a pointing direction change unit (209), and a transmission signal generation unit (23). The power transmission antenna is a phased array antenna, and has a plurality of element antennas (27) for radiating radio waves (2), and a plurality of element modules (24, 26) having a phase shifter (28) for changing the phase of a transmission signal and an amplifier (29) for amplifying the transmission signal. The phase shift value set in the phase shifter provided in each element module is obtained by an REV method using an aerial mobile body (3J) that is stationary above a power transmission antenna and that is equipped with a measurement antenna (14) for receiving radio waves and a radio wave measuring unit (15) for measuring received radio wave data including the amplitude of the radio waves received by the measurement antenna.

Inventors

  • HOMMA Yukihiro
  • SATO MAHO
  • Zexue

Assignees

  • 三菱电机株式会社
  • 三菱电机株式会社

Dates

Publication Date
20260421
Application Date
20180410
Priority Date
20180410

Claims (20)

  1. 1. A wireless power transmission apparatus, comprising: A power transmission antenna that transmits electric power by using the radiated electric wave and is capable of changing the direction of the power transmission antenna; a radiation direction determining unit that determines a radiation direction, which is a direction in which an aerial mobile object, which is a transmission target, exists; a direction changing unit for changing the direction of the power transmission antenna to the radiation direction, and A transmission signal generation unit that generates a transmission signal to be transmitted as the radio wave from the power transmission antenna, The power transmission antenna is a phased array antenna having the following components: A plurality of element antennas for radiating the electric wave, and A plurality of element modules having a phase shifter for changing the phase of the transmission signal and an amplifier for amplifying the transmission signal, The pointing direction changing unit controls the phase shift amount of the phase shifter, The phase shift value of each of the phase shifters is obtained by an REV method using an airborne mobile unit that is stationary above the power transmission antenna and is equipped with a measuring antenna that receives the radio wave and a radio wave measuring unit that measures received radio wave data including the amplitude of the radio wave received by the measuring antenna.
  2. 2. The wireless power transmission apparatus of claim 1, wherein, A mobile body time device which outputs time data which is synchronized with a ground time device provided on the ground, a received radio wave data time adding unit which adds time data outputted from the mobile body time device at a time point when the received radio wave data is measured to the received radio wave data, thereby generating band time received radio wave data, The phase shift value is obtained based on REV-method-execution-time wave data, which is the wave data received from the band time measured by the wave measuring unit during REV method execution, by radiating the wave whose phase is changed by a part of the phase shifters according to time data output from the ground time device.
  3. 3. A wireless power transmission apparatus according to claim 1 or 2, wherein, The power transmission antenna includes a plurality of power transmission units each having a plurality of element antennas, a secondary module which is the element module provided for each of the determined number of element antennas, and a primary module which is the element module for uniformly changing phases of the transmission signals input to the plurality of element antennas, In the phase shifter provided in the secondary module, a phase shift value is determined so that the element antennas corresponding to the secondary modules can radiate the electric waves of the same phase in the case where the same phase command value is provided to the secondary modules, The phase shift value of the phase shifter provided in the primary module is set based on a phase difference of the electric wave radiated from each of the power transmission units.
  4. 4. A power transmission system for transmitting power to an airborne mobile unit, comprising: a wireless power transmission apparatus, the wireless power transmission apparatus comprising: A power transmission antenna that transmits electric power by using the radiated electric wave and is capable of changing the direction of the power transmission antenna; a radiation direction determining unit that determines a radiation direction, which is a direction in which an aerial mobile object, which is a transmission target, exists; a direction changing unit for changing the direction of the power transmission antenna to the radiation direction, and A transmission signal generation unit that generates a transmission signal to be transmitted as the radio wave from the power transmission antenna, The power transmission antenna is a phased array antenna having the following components: A plurality of element antennas for radiating the electric wave, and A plurality of element modules having a phase shifter provided for each of the determined number of element antennas and configured to change a phase of the transmission signal and an amplifier configured to amplify the transmission signal, The pointing direction changing unit controls the phase shift amount of the phase shifter; A power transmission control device that controls the wireless power transmission device; the ground time device is arranged on the ground and outputs time data; an aerial mobile body mounted with a measurement antenna, a radio wave measuring unit, a mobile body time device, a radio wave data reception time adding unit, and a mobile body communication unit; the measuring antenna for receiving the radio wave radiated by the radio transmission device; a radio wave measuring unit that measures received radio wave data including an electric field intensity, which is an amplitude of the radio wave received by the measuring antenna; The moving body time device outputs time data which is kept synchronous with the ground time device; A received radio wave data time adding unit that adds time data output by the mobile unit time device at a time point when the received radio wave data is measured to the received radio wave data, thereby generating band time received radio wave data; The mobile communication unit which communicates with the power transmission control device, and A REV method analysis unit that obtains an element electric field phase for each of the element modules based on REV method execution time wave data, which is the band time received wave data measured by the wave measurement unit during execution of the REV method scheme, and on the basis of REV method scheme that specifies a phase operation mode in which a phase shift amount of an operation phase shifter, which is a phase shifter, is changed repeatedly in a state in which at least a part of the element antennas radiate the wave in order to execute the REV method, the REV method obtains a phase of an element electric field vector generated at a position of the measurement antenna by the wave radiated by the element antenna to which the transmission signal outputted by one of the element modules is supplied, The power transmission control device includes a power transmission control communication unit that communicates with the mobile communication unit, and a REV method execution unit that controls the wireless power transmission device based on the REV method scheme, The pointing direction changing unit is configured to orient the pointing direction to the radiation direction in a state where the reference of the phase of the element module is made uniform based on the element electric field phase of each of the element modules.
  5. 5. The power transmission system for transmitting power to an airborne mobile unit according to claim 4, The wireless power transmission device further includes a power receiving antenna mounted on the aerial mobile body on which the measuring antenna is mounted, and configured to receive the radio wave radiated by the wireless power transmission device.
  6. 6. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, The transmission control device has the REV method analysis unit, The transmission control communication section transmits a data acquisition command for instructing to acquire electric field change data generated based on electric wave data at the time of execution of the REV method to the mobile communication section, receives the electric field change data transmitted by the mobile communication section in accordance with the data acquisition command, The REV method analysis unit obtains the element electric field phase for each element module based on the electric field change data and the REV method scheme.
  7. 7. The power transmission system for transmitting power to an airborne mobile unit according to claim 6, The electric field change data is electric wave data at the time of execution of the REV method, The REV method analysis unit includes a measurement data analysis unit that analyzes radio wave data at the time of execution of the REV method based on the REV method scheme, detects a phase shift amount detection time for each of the operation phase shifters, a phase shift amount acquisition unit that obtains an operation phase shift amount, which is a phase shift amount of the operation phase shifter at the phase shift amount detection time, based on the REV method scheme, and an element electric field phase calculation unit that calculates the element electric field phase based on the operation phase shift amount.
  8. 8. The power transmission system for transmitting power to an airborne mobile unit according to claim 6, A measurement data analysis unit mounted on the aerial mobile body, the measurement data analysis unit analyzing radio wave data at the time of execution of the REV method for each of a plurality of analysis periods notified by the data acquisition command, detecting a phase shift amount detection timing for each of the analysis periods, The electric field variation data is the phase shift amount detection timing, The REV method analysis unit includes a phase shift amount acquisition unit that obtains an operation phase shift amount, which is the phase shift amount of the operation phase shifter at the phase shift amount detection timing, based on the REV method scheme, and an element electric field phase calculation unit that calculates the element electric field phase based on the operation phase shift amount.
  9. 9. The power transmission system for transmitting power to an airborne mobile unit according to claim 6, In the REV method scheme, the phase operation mode is represented by one or more reference phenomena at a specified time, and a non-reference phenomenon in which a time is represented by a relative time from any of the reference phenomena, The aerial mobile body is provided with: a data storage device for storing the REV method scheme, and A measurement data analysis unit that analyzes the radiowave data at the time of execution of the REV method for each of a plurality of analysis periods set based on the REV method scheme and at the time of the reference phenomenon notified by the data acquisition command, detects a phase shift amount detection time for each of the analysis periods, The electric field variation data is the phase shift amount detection timing, The REV method analysis unit includes a phase shift amount acquisition unit that obtains an operation phase shift amount, which is the phase shift amount of the operation phase shifter at the phase shift amount detection timing, based on the REV method scheme, and an element electric field phase calculation unit that calculates the element electric field phase based on the operation phase shift amount.
  10. 10. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in any one of claims 7 to 9, The power transmission control device has a phase operation recording unit that records phase operation data that is a time change in the phase shift amount of the operation phase shifter during execution of the REV method scheme, The phase shift amount acquisition unit refers to the phase operation data at the phase shift amount detection timing to determine the operation phase shift amount.
  11. 11. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in any one of claims 7 to 9, In the REV method scheme, the phase operation mode is represented by one or more reference phenomena at a specified time, and a non-reference phenomenon in which a time is represented by a relative time from any of the reference phenomena, The phase shift amount acquisition unit obtains the operation phase shift amount based on the timing of the reference phenomenon, the REV method scheme, and the phase shift amount detection timing.
  12. 12. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, In the REV method scheme, the phase operation mode is represented by one or more reference phenomena at a specified time, and a non-reference phenomenon in which a time is represented by a relative time from any of the reference phenomena, The power transmission control communication unit transmits an electric field calculation command for obtaining the element electric field phase to the mobile communication unit, receives the element electric field phase transmitted from the mobile communication unit based on the electric field calculation command, The aerial mobile body is provided with: a data storage device that stores the REV scheme; A measurement data analysis unit that analyzes radio wave data at the time of execution of the REV method based on the timing of the reference phenomenon notified by the electric field calculation command and the REV method scheme, and detects a phase shift amount detection timing for each of the operation phase shifters; A phase shift amount acquisition unit that obtains an operation phase shift amount, which is a phase shift amount of the operation phase shifter at the phase shift amount detection timing, based on the timing of the reference phenomenon and the REV method scheme, and The REV method analysis unit obtains the element electric field phase from the operation phase shift amount.
  13. 13. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, The phase operation mode is defined such that a plurality of different phasors of the operating phase shifter are obtained respectively above the decided duration.
  14. 14. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, The REV method execution unit executes the REV method scheme after the radiation direction determination unit determines the radiation direction.
  15. 15. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, The REV method is configured to change a phase shift amount of a part of the phase shifter in a state where at least a part of the element antennas radiate the radio wave by using a small power less than half of a rated power and a normal power more than half of the rated power, The REV method execution unit executes the normal power portion in the REV method scheme in a state where the reference of the phase of the element module is made uniform, based on the element electric field phase of each of the element modules obtained by executing the low power portion in the REV method scheme.
  16. 16. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, And a direction signal transmitting/receiving unit for transmitting and receiving a direction signal from the aerial mobile body in order to notify a presence direction, which is a presence direction of the aerial mobile body as seen from the power transmission antenna, And selecting one of the direction signal transmitting/receiving unit and the mobile body communication unit to transmit electric field change data generated based on the REV method-performed radio wave data from the aerial mobile body.
  17. 17. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 4 or 5, characterized in that, Setting a phase shift value of each of the phase shifters based on the element electric field phase of each of the element modules.
  18. 18. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 16, characterized in that, The mobile communication unit uses a measurement communication system that is a communication system different from a mobile communication system for controlling the airborne mobile unit.
  19. 19. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 16, characterized in that, The mobile communication unit uses a mobile communication system for controlling the aerial mobile.
  20. 20. An electric power transmission system for transmitting electric power to an airborne mobile unit as claimed in claim 16, characterized in that, The mobile communication unit uses a measurement communication system which is a communication system different from the mobile communication system for controlling the airborne mobile unit, And selecting one of the direction signal transmitting/receiving unit, the mobile communication system, and the measurement communication system to transmit the electric field change data from the airborne mobile unit.

Description

Wireless power transmission device and power transmission system for transmitting power to aerial mobile body The application is a divisional application of application number 201880034108.9, with application number of "2018, 4, 10 days" and entitled "radio wave measurement System". Technical Field The present invention relates to a wireless power transmission device that wirelessly transmits electric power by radio waves, and a power transmission system that transmits electric power to an airborne mobile unit. Background A system for controlling the direction of a power transmission microwave beam by controlling microwaves radiated from a plurality of element antennas and transmitting power has been developed (see non-patent document 1). The system has been developed with a view to transmitting electric power to a remote place using radio waves of a frequency band such as microwaves. In this system, an amplitude single pulse Method and an element electric field Vector rotation Method (Rotating ELEMENT ELECTRIC FIELD Vector (REV) Method, REV Method) are used for beam control. By using the amplitude monopulse method and the REV method, efficient wireless power transmission using microwaves is achieved. A pilot signal for guiding the transmission direction of the transmission microwaves from the power receiving side is transmitted, the arrival direction of the pilot signal is detected by each transmission pulse according to the amplitude single pulse method, and the microwaves are radiated in the direction. According to the REV method, the optical path length corresponding to the difference in height between the power transmission pulses is detected and corrected. The beam direction and radiation pattern of the transmitted microwaves are measured by mounting a monitor antenna on a two-dimensionally movable XY scanner to scan the area irradiated with the radio waves. As a power supply system for supplying power to a mobile body in an underwater environment, there has been proposed a system in which the mobile body to be supplied with power is guided in a direction in which electromagnetic field energy becomes large and is induced to a power supply position where wireless power supply is received (see patent literature 1). Patent document 1 proposes to use an antenna for power transmission also for communication. Fig. 11 of patent document 1 shows that a communication function 150 is present in the transmitting antenna 11-1, and fig. 12 shows that a communication function 250 is present in the receiving antenna 21-1. However, patent document 1 does not describe a specific configuration in which an antenna for power transmission is also used for communication. Prior art literature Patent literature Patent document 1 Japanese patent laid-open publication 2016-127678 Non-patent literature Non-patent document 1, murrak province, "development of high-precision microwave beam direction control device for SSPS implementation and technical verification test", electronic information communication society report, SANE2015-22, pp.37-42, june 2015. Disclosure of Invention Technical problem to be solved by the invention In the environment of the reflected radio wave, there is an influence of multipath. Therefore, it is difficult to measure the radiation pattern of the antenna with high accuracy. In addition, in the case of measuring a high-precision antenna radiation pattern, measurement is performed in an anechoic chamber environment where radio waves are difficult to reflect. However, even in the environment of an anechoic chamber, the influence of multipath is small. Therefore, measurement with a required accuracy may not be possible. Further, in a wireless power transmission device that transmits power to an airborne mobile unit, there is a problem in that radio waves cannot be radiated with high accuracy in a direction in which the airborne mobile unit exists, and efficiency of wireless power transmission is lowered. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a wireless power transmission device that controls a radio wave radiated from an antenna that transmits power to an airborne mobile unit with higher accuracy than in the past, and a power transmission system that transmits power to the airborne mobile unit. Technical proposal adopted for solving the technical problems The wireless power transmission device includes a power transmission antenna that transmits power by using a radio wave that is radiated and is capable of changing a direction of the power transmission, a radiation direction determination unit that determines a radiation direction that is a direction in which an airborne mobile object that is a power transmission object exists, a direction change unit that directs the direction of the power transmission antenna to the radiation direction, and a transmission signal generation unit that generates a transmission signal