WO2023223857A1 - Dispositif de réception d'énergie, dispositif d'alimentation en énergie, système d'alimentation en énergie optique, procédé de réception d'énergie, procédé d'alimentation en énergie et procédé d'alimentation en énergie optique - Google Patents

Dispositif de réception d'énergie, dispositif d'alimentation en énergie, système d'alimentation en énergie optique, procédé de réception d'énergie, procédé d'alimentation en énergie et procédé d'alimentation en énergie optique Download PDF

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Publication number
WO2023223857A1
WO2023223857A1 PCT/JP2023/017234 JP2023017234W WO2023223857A1 WO 2023223857 A1 WO2023223857 A1 WO 2023223857A1 JP 2023017234 W JP2023017234 W JP 2023017234W WO 2023223857 A1 WO2023223857 A1 WO 2023223857A1
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WIPO (PCT)
Prior art keywords
power
wavelength
light
power supply
feeding
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PCT/JP2023/017234
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English (en)
Japanese (ja)
Inventor
真司 津田
俊 岩▲崎▼
良之 木村
隆裕 石井
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京セラ株式会社
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Publication of WO2023223857A1 publication Critical patent/WO2023223857A1/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
    • H02J50/30—Circuit arrangements or systems for wireless supply or distribution of electric power using light, e.g. lasers
    • 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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water

Definitions

  • the present disclosure relates to a power receiving device, a power feeding device, an optical power feeding system, a power receiving method, a power feeding method, and an optical power feeding method.
  • Japanese Unexamined Patent Publication No. 2010-135989 discloses an optical transmitter that transmits signal light modulated by an electrical signal and feeding light for supplying power, a core that transmits the signal light, and an optical transmitter that transmits the signal light, and an optical transmitter formed around the core.
  • An optical communication device comprising: an optical receiver that operates using power obtained by converting the feeding light transmitted through the optical fiber core, and converts the signal light transmitted through the core of the optical fiber into the electrical signal.
  • the power receiving device includes: a light receiving unit that converts the incident power supply light into electric power; a demodulator that extracts information included in the feeding light; The information is inserted into the feeding light by wavelength modulation in which the wavelength of the feeding light changes into at least a first wavelength and a second wavelength, The light receiving section has different sensitivity at least at the first wavelength and at the second wavelength, The demodulator extracts the information based on the magnitude of the power converted by the light receiver.
  • the power supply device includes: a light emitting unit that outputs power supply light and can change the wavelength of the power supply light to at least a first wavelength and a second wavelength; a modulation unit that inserts information into the feeding light by wavelength modulation that changes the wavelength of the feeding light into at least the first wavelength and the second wavelength; Equipped with The light emitting unit outputs the power supply light having a power according to a predetermined condition at least during a period in which the modulation unit inserts information into the power supply light.
  • the optical power feeding system includes: Comprising a power feeding device and a power receiving device,
  • the power supply device includes: a light emitting unit that outputs power supply light and can change the wavelength of the power supply light to at least a first wavelength and a second wavelength; a modulator that includes information in the feeding light by wavelength modulation that changes the wavelength of the feeding light into at least the first wavelength and the second wavelength; has
  • the power receiving device includes: a light receiving unit that converts the incident power supply light into electric power; a demodulator that extracts information included in the power supply light;
  • the light receiving section has different sensitivity at least at the first wavelength and at the second wavelength, The demodulator extracts the information based on the magnitude of the power converted by the light receiver.
  • the power receiving method is as follows: The power supply light into which information has been inserted by wavelength modulation is received by a light receiving section whose spectral sensitivity is not constant, thereby converting the power supply light into electric power, and further converting the power supply light into electric power, which changes in accordance with the change in the wavelength of the power supply light. Extracting the information based on size.
  • the power supply method is Information is inserted by wavelength modulation into the feeding light whose power is in accordance with predetermined conditions, and the feeding light into which the information has been inserted is sent out.
  • the optical power feeding method includes: While transmitting power by sending out power light with information inserted through wavelength modulation, The power supply light is received by a light receiving unit with non-uniform spectral sensitivity, the power reception is performed by converting the power supply light into electric power, and further, the power is received based on the magnitude of the power that changes in response to a change in the wavelength of the power supply light. and extract the information.
  • FIG. 1 is a configuration diagram of an optical power feeding system according to a first embodiment of the present disclosure.
  • FIG. 2 is a configuration diagram of an optical power feeding system according to a second embodiment of the present disclosure.
  • FIG. 2 is a configuration diagram of an optical power supply system according to a second embodiment of the present disclosure, illustrating optical connectors and the like.
  • FIG. 2 is a configuration diagram of an optical power supply system according to another embodiment of the present disclosure.
  • FIG. 2 is a configuration diagram of an optical power feeding system according to another embodiment of the present disclosure.
  • FIG. 2 is a configuration diagram of an optical power supply system according to another embodiment of the present disclosure.
  • FIG. 7 is a configuration diagram showing an optical power supply system according to a third embodiment to which a configuration for transmitting power and information via power supply light is applied.
  • FIG. 7 is a configuration diagram showing an optical power supply system according to a fourth embodiment to which a configuration for transmitting power and information via power supply light is applied. It is a flowchart which shows an example of the transmission process performed in 4th Embodiment.
  • the optical power supply system 1A of this embodiment includes a power supply device (PSE: Power Sourcing Equipment) 110, an optical fiber cable 200A, and a power receiving device (PD: Powered Device) 310. Since the optical power supply system 1A transmits power supply light via the optical fiber 250A, it may also be referred to as an optical fiber power supply (PoF: Power over Fiber) system.
  • the power feeding device in the present disclosure is a device that converts electric power into optical energy and supplies the same, and the power receiving device is a device that receives optical energy and converts the optical energy into electric power.
  • the power supply device 110 includes a semiconductor laser 111 for power supply.
  • the optical fiber cable 200A includes an optical fiber 250A that forms a transmission path for power supply light.
  • Power receiving device 310 includes a photoelectric conversion element 311.
  • the power supply device 110 is connected to a power source, and the power supply semiconductor laser 111 and the like are electrically driven.
  • the power supply semiconductor laser 111 oscillates with power from the power source and outputs power supply light 112 .
  • the optical fiber cable 200A has one end 201A connectable to the power supply device 110 and the other end 202A connectable to the power reception device 310, and transmits the power supply light 112.
  • Power feeding light 112 from the power feeding device 110 is input to one end 201A of the optical fiber cable 200A, the power feeding light 112 propagates through the optical fiber 250A, and is output from the other end 202A to the power receiving device 310.
  • the photoelectric conversion element 311 converts the power supply light 112 transmitted through the optical fiber cable 200A into electric power.
  • the power converted by the photoelectric conversion element 311 is used as driving power required within the power receiving device 310. Further, the power receiving device 310 can output the power converted by the photoelectric conversion element 311 for external equipment.
  • the semiconductor material constituting the semiconductor region of the power feeding semiconductor laser 111 and the photoelectric conversion element 311 that performs the optical-to-electrical conversion effect is a semiconductor having a short laser wavelength of 500 nm or less.
  • a semiconductor with a short laser wavelength has a large band gap and high photoelectric conversion efficiency, so the photoelectric conversion efficiency on the power generation side and the power receiving side of optical power supply is improved, and the optical power supply efficiency is improved.
  • a semiconductor material of a laser medium having a laser wavelength (fundamental wave) of 200 to 500 nm, such as diamond, gallium oxide, aluminum nitride, or GaN, may be used as the semiconductor material.
  • a semiconductor having a band gap of 2.4 eV or more is applied as the semiconductor material.
  • a semiconductor material of the laser medium with a band gap of 2.4 to 6.2 eV such as diamond, gallium oxide, aluminum nitride, or GaN, may be used.
  • a semiconductor material of the laser medium with a laser wavelength (fundamental wave) greater than 500 nm may be used.
  • a semiconductor material of a laser medium having a laser wavelength (fundamental wave) smaller than 200 nm may be used.
  • the optical power supply system 1 of this embodiment includes a power over fiber (PoF) system and an optical communication system, and includes a power supply equipment (PSE) 110.
  • the power supply device 110 includes a semiconductor laser 111 for power supply.
  • the first data communication device 100 includes a power supply device 110, a transmitter 120 that performs data communication, and a receiver 130.
  • the first data communication device 100 corresponds to a data terminal equipment (DTE), a repeater, or the like.
  • the transmitter 120 includes a signal semiconductor laser 121 and a modulator 122.
  • the receiving section 130 includes a signal photodiode 131.
  • the optical fiber cable 200 includes an optical fiber 250 having a core 210 that forms a transmission path for signal light, and a cladding 220 that is arranged around the outer periphery of the core 210 and forms a transmission path for power feeding light.
  • Power receiving device 310 includes a photoelectric conversion element 311.
  • Second data communication device 300 includes a power receiving device 310, a transmitting section 320, a receiving section 330, and a data processing unit 340.
  • the second data communication device 300 is a power end station. etc.
  • the transmitter 320 includes a signal semiconductor laser 321 and a modulator 322.
  • the receiving section 330 includes a signal photodiode 331.
  • Data processing unit 340 is a unit that processes received signals.
  • the second data communication device 300 is a node in the power supply network. Alternatively, the second data communication device 300 may be a node that communicates with other nodes.
  • the first data communication device 100 is connected to a power source, and a power supply semiconductor laser 111, a signal semiconductor laser 121, a modulator 122, a signal photodiode 131, and the like are electrically driven. Further, the first data communication device 100 is a node in a power supply network. Alternatively, the first data communication device 100 may be a node that communicates with other nodes.
  • the power supply semiconductor laser 111 oscillates with power from the power source and outputs power supply light 112 .
  • the photoelectric conversion element 311 converts the power supply light 112 transmitted through the optical fiber cable 200 into electric power.
  • the power converted by the photoelectric conversion element 311 is used as the driving power for the transmitting section 320, the receiving section 330, and the data processing unit 340, and the driving power necessary for other parts within the second data communication device 300.
  • the second data communication device 300 may be capable of outputting the power converted by the photoelectric conversion element 311 for external equipment.
  • the modulator 122 of the transmitter 120 modulates the laser beam 123 from the signal semiconductor laser 121 based on the transmission data 124 and outputs it as signal light 125.
  • the signal photodiode 331 of the receiving section 330 demodulates the signal light 125 transmitted through the optical fiber cable 200 into an electrical signal and outputs it to the data processing unit 340.
  • the data processing unit 340 transmits data based on the electrical signal to the node, while receiving data from the node and outputting it to the modulator 322 as transmission data 324.
  • the modulator 322 of the transmitter 320 modulates the laser light 323 from the signal semiconductor laser 321 based on the transmission data 324 and outputs it as signal light 325.
  • the signal photodiode 131 of the receiving unit 130 demodulates the signal light 325 transmitted through the optical fiber cable 200 into an electrical signal and outputs the electrical signal. Data based on the electrical signal is transmitted to the node, and data from the node is used as transmission data 124.
  • a power supply light 112 and a signal light 125 from the first data communication device 100 are input to one end 201 of an optical fiber cable 200, the power supply light 112 propagates through a cladding 220, the signal light 125 propagates through a core 210, and the other end 202 and is output to the second data communication device 300.
  • Signal light 325 from the second data communication device 300 is input to the other end 202 of the optical fiber cable 200, propagates through the core 210, and is output from the one end 201 to the first data communication device 100.
  • the first data communication device 100 is provided with an optical input/output section 140 and an optical connector 141 attached thereto.
  • the second data communication device 300 is provided with an optical input/output section 350 and an optical connector 351 attached thereto.
  • An optical connector 230 provided at one end 201 of the optical fiber cable 200 connects to the optical connector 141.
  • An optical connector 240 provided at the other end 202 of the optical fiber cable 200 connects to an optical connector 351.
  • the optical input/output section 140 guides the feeding light 112 to the cladding 220 , the signal light 125 to the core 210 , and the signal light 325 to the receiving section 130 .
  • the optical input/output unit 350 guides the power supply light 112 to the power receiving device 310 , the signal light 125 to the receiving unit 330 , and the signal light 325 to the core 210 .
  • the optical fiber cable 200 has one end 201 connectable to the first data communication device 100 and the other end 202 connectable to the second data communication device 300, and transmits the power supply light 112. Furthermore, in this embodiment, the optical fiber cable 200 bidirectionally transmits the signal lights 125 and 325.
  • the same semiconductor materials as in the first embodiment are used as the semiconductor materials constituting the semiconductor regions of the power feeding semiconductor laser 111 and the photoelectric conversion element 311 that perform the optical-to-electrical conversion effect, and high optical power feeding efficiency is achieved. .
  • optical fiber 260 that transmits the signal light and the optical fiber 270 that transmits the power feeding light may be provided separately.
  • the optical fiber cable 200B may also be composed of a plurality of cables.
  • the optical power supply system 1C may transmit the power supply light 112 through space.
  • Such an optical power feeding system is called PoA (Power over Air).
  • the power feeding device 110 may include a collimator lens 115, and may send out the power feeding light 112 emitted from the power feeding semiconductor laser 111 into space via the collimator lens 115.
  • the collimator lens 115 may not be provided if the spread of the feeding light 112 is small.
  • the power receiving device 310 may include a lens 313 such as a condensing lens or a diffusing lens, and the power feeding light 112 may be incident on the photoelectric conversion element 311 via the lens 313. Further, the power receiving device 310 may not include the lens 313 and the power feeding light 112 may be directly incident on the photoelectric conversion element 311.
  • the optical power supply system 1D may transmit the power supply light 112 via the optical fiber 270D in a part of the section 501, and may transmit it through space in another part of the section 502. .
  • the collimator lens 281 may be located at the starting end of the section 502, or the collimator lens 281 may not be provided.
  • a lens 282 such as a condensing lens or a diffusing lens may be located at the end of the section 502, or the lens 282 may not be provided.
  • FIG. 7 is a configuration diagram showing an optical power supply system 1E according to a third embodiment to which a configuration for transmitting power and information via power supply light 112 is applied.
  • FIG. 8 is a graph showing the spectral sensitivity of the photoelectric conversion element.
  • the optical power feeding system 1E of the third embodiment includes a power feeding device 110E and a power receiving device 310E.
  • the power supply device 110E includes a light emitting section 111E that outputs the power supply light 112 and a modulation section 150 that inserts information into the power supply light 112.
  • the light emitting unit 111E has a function of changing the wavelength of the power supply light 112 to at least a first wavelength ⁇ 1 and a second wavelength ⁇ 2.
  • the light emitting unit 111E may be configured to be able to discretely change the wavelength of the power supply light 112 from the first wavelength ⁇ 1 to the nth wavelength ⁇ n (n is an integer of 2 or more), or may change the wavelength of the feeding light 112 from the first wavelength ⁇ 1 to the nth wavelength ⁇ n (n is an integer of 2 or more).
  • the configuration may be such that it can be changed continuously over n wavelengths ⁇ n.
  • the light emitting unit 111E may be one power supply semiconductor laser having a variable wavelength structure, or may include a plurality of power supply semiconductor lasers having different oscillation wavelengths, and may switch between power supply semiconductor lasers that emit the power supply light 112.
  • the configuration may be such that it is possible.
  • the light emitting unit 111E outputs the power supply light 112 with power according to predetermined conditions, at least during the period in which information is inserted into the power supply light 112.
  • the power feeding device 110E may include a power control section that controls the power of the light emitting section 111E, and the light emitting section 111E may emit the feeding light 112 with the above power under the control of the power control section.
  • Power according to predetermined conditions is, for example, constant power.
  • power according to predetermined conditions is not limited to a constant power.
  • power according to predetermined conditions may be power that changes according to various conditions, such as power that changes according to time or power that changes according to a request from power receiving device 310E. That is, the power of the power feeding light 112 output by the light emitting unit 111E may be determined in advance as long as conditions for determining the power are determined in advance so that the power receiving device 310E can know the power of the feeding light 112 in advance.
  • the modulation unit 150 inserts information into the power supply light 112 by performing wavelength modulation to change the wavelength of the power supply light 112 output from the light emitting unit 111E into at least a first wavelength ⁇ 1 and a second wavelength ⁇ 2.
  • the wavelength modulation may be modulation that discretely changes the wavelength of the feeding light 112 from the first wavelength ⁇ 1 to the nth wavelength ⁇ n (n is an integer of 2 or more), or may be a modulation that discretely changes the wavelength of the feeding light 112 from the first wavelength ⁇ 1 to the nth wavelength ⁇ n.
  • the modulation may be such that the wavelength of the power feeding light 112 is continuously changed in a region including the region.
  • the wavelength modulation method may be digital modulation or analog modulation.
  • the modulator 150 may insert information into the feeding light 112 using a modulation method that combines changes in wavelength and changes in elements other than wavelength and power.
  • the power receiving device 310E includes a light receiving section 311E and a demodulating section 370.
  • the light receiving unit 311E converts the power supply light 112 into electric power.
  • the power converted by the light receiving unit 311E is supplied to a subsequent load (an electric circuit, an electric device, etc.), and the load operates with the power.
  • the light receiving section 311E is a photoelectric conversion element that has different sensitivity at least at the first wavelength ⁇ 1 and the second wavelength ⁇ 2.
  • the light receiving section 311E may be a photoelectric conversion element having characteristics in which the sensitivities from the first wavelength ⁇ 1 to the nth wavelength ⁇ n are all different, or from the first wavelength ⁇ 1 to the nth wavelength ⁇ n.
  • the photoelectric conversion element may have a characteristic that the sensitivity changes continuously with a gradient in the same direction over the n-th wavelength ⁇ n.
  • sensitivity means the amount of power converted when the feeding light 112 of a single wavelength and unit power is incident.
  • the relative spectral response on the vertical axis indicates the relative value of the short-circuit current output from the photoelectric conversion element when light of a single wavelength is incident.
  • the light receiving section 311E may be the photoelectric conversion element 311 shown in Embodiment 1. Further, the light receiving section 311E may be a solar cell.
  • the sensitivity of solar cells may vary depending on the material, composition, crystal structure, and other forms. The type of solar cell to be employed may be selected by considering various technical circumstances such as its intended use and the characteristics of the semiconductor laser for power supply. For example, the following solar cells may be used.
  • solar cells are, for example, silicon-based solar cells such as single crystal silicon, polycrystalline silicon, or heterojunction type solar cells, or compound-based solar cells (e.g., GaN-based, GaAs-based, InGaP-based, InGaAs-based, or Ge-based solar cells, Alternatively, a tandem solar cell in which at least two or more solar cells of these types are joined together may be included, but is not limited thereto.
  • a large light-receiving surface can be realized at low cost.
  • efficient light reception is possible even if the power supply light 112 has a relatively large spread.
  • the magnitude of the power converted when the power supply light 112 with the first wavelength ⁇ 1 is incident at the first power is the same as the magnitude of the power supplied with the second wavelength ⁇ 2 at the same first power.
  • the magnitude of the power converted when the light 112 is incident is different from the magnitude of the power converted when the feeding light 112 with the same first power and the n-th wavelength ⁇ n is incident. That is, when the power of the feeding light 112 incident on the light receiving section 311E is constant, a difference in the wavelength of the feeding light 112 appears as a difference in the magnitude of the power converted by the light receiving section 311E.
  • the demodulator 370 detects the magnitude of the power converted by the light receiver 311E, and extracts information inserted into the power supply light 112 based on the detected magnitude of the power. That is, the wavelength of the feeding light 112 into which information has been inserted by wavelength modulation changes depending on the inserted information. The change in wavelength is converted into a change in power level in the light receiving section 311E. Therefore, the demodulator 370 can extract information by regarding the information inserted by wavelength modulation as information inserted by modulating the power magnitude and performing demodulation processing based on the power magnitude.
  • the demodulator 370 has data indicating the relationship between the sensitivity of the light receiver 311E and the wavelength, estimates the wavelength of the power supply light 112 from this data and the magnitude of the detected power, and adjusts the wavelength to the estimated wavelength. Processing to extract information based on the information may be performed.
  • the demodulator 370 detects the amount of power by detecting the current value supplied from the light receiver 311E to the load (when the voltage is constant, etc.), and by detecting the voltage value supplied from the light receiver 311E to the load (when the current is constant). It can be realized by various methods such as detecting both current value and voltage value.
  • the demodulator 370 can obtain the power value of the power supply light 112 according to predetermined conditions. If the value of the power can be obtained, it is possible to calculate the relationship between the magnitude of the converted power and the wavelength when the feeding light 112 of the power is incident. Then, the wavelength can be calculated based on this relationship and the magnitude of the power output from the light receiving section 311E. Therefore, even in this case, the demodulator 370 can extract the information inserted by wavelength modulation based on the magnitude of the power converted by the light receiver 311E.
  • information and power can be transmitted simultaneously using the power supply light 112 as a medium.
  • the power supply device 110E inserts information into the power supply light 112 by wavelength modulation, the power of the power supply light 112 changes due to the information, compared to a case where information is inserted into the power supply light 112 by pulse modulation, power modulation, etc. can be reduced. Therefore, the power supply device 110E can stably supply power while transmitting information. Furthermore, by employing a power feeding semiconductor laser having a wavelength variable structure as the light emitting portion 111E, the power feeding device 110E can be configured simply.
  • the power receiving device 310E has a light receiving section 311E with different sensitivity depending on the wavelength of the incident light, and the demodulating section 370 extracts information based on the magnitude of the power converted by the light receiving section 311E. Therefore, the power receiving device 310E can be simply configured without requiring a light receiving section dedicated to receiving information. Furthermore, the power receiving device 310E can be simply configured without requiring a configuration that performs spectroscopy according to wavelength.
  • the power supply device 110E and the power reception device 310E of the third embodiment may be applied to the optical power supply system 1A of FIG. 1 that transmits the power supply light 112 via the optical fiber cable 200A, or may have a data transmission function separately. It may be applied to the optical power feeding systems 1, 1B to 1D shown in FIGS. 2 to 6. That is, the power feeding device 110 in FIGS. 1 to 6 may be replaced by the power feeding device 110E, and the power receiving device 310 in FIGS. 1 to 6 may be replaced by the power receiving device 310E.
  • two systems of data transmission are performed: data transmission via the signal lights 125 and 325, and information transmission via the power supply light 112. It becomes possible.
  • FIG. 9 is a configuration diagram showing an optical power supply system 1F according to the fourth embodiment, to which a configuration for transmitting power and information via the power supply light 112 is applied.
  • the same components as in the third embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
  • the optical power feeding system 1F includes a power feeding device 110F and a power receiving device 310F.
  • the power supply device 110F includes a light emitting unit 111E that outputs the power supply light 112, a modulation unit 150 that inserts information into the power supply light 112, a power transmission control unit 160 that performs control regarding transmission of the power supply light 112 and information transmission, and a power receiving device. 310F.
  • the power receiving device 310F includes a light receiving unit 311E that converts the power supply light 112 into electric power, a demodulation unit 370 that extracts information included in the power supply light 112, and a power reception control unit 380 that performs control regarding information transmission via the power supply light 112. , and a transmitter 390 that transmits data 392 to the power supply device 110F.
  • the transmitting unit 390 and the receiving unit 170 are configured to transmit and receive data 392 using any medium such as signal light, feeding light 112 or reflected light of signal light, radio waves, wired electrical signals, etc. There may be.
  • the power transmission control unit 160 performs control to switch the wavelength region of the power feeding light 112 used by the modulation unit 150 and control to execute calibration processing by driving the light emitting unit 111E.
  • the power reception control unit 380 executes calibration processing and information transmission response processing.
  • the modulator 150 and the demodulator 370 can transmit information via the feed light 112 by wavelength modulating and demodulating the feed light 112.
  • Wavelength modulation can be performed using the first wavelength range 401 in FIG. 8 or the second wavelength range 402, and several choices are possible.
  • the power transmission control unit 160 switches the wavelength range used for wavelength modulation between at least the first wavelength range 401 and the second wavelength range 402, depending on the situation.
  • the wavelength region used for wavelength modulation means the region between the maximum value (maximum wavelength) and the minimum value (minimum wavelength) of the wavelength changed by wavelength modulation.
  • the first wavelength region 401 is a region that can be converted into electric power with high efficiency in the light receiving section 311E, but the region width is narrow. Therefore, when the first wavelength region 401 is selected, the efficiency of power transmission can be improved, but the amount of information that can be transmitted per unit time is relatively small.
  • the second wavelength region 402 has a wide region width, but includes a wavelength region in which the power conversion efficiency of the light receiving section 311E is relatively low. Therefore, when the second wavelength region 402 is selected, the amount of information that can be transmitted per unit time increases, but the efficiency of power transmission is relatively reduced.
  • the power transmission control unit 160 selects the first wavelength region 401 when the power to be transmitted is large, and selects the second wavelength region 402 when the power to be transmitted is small and the amount of information to be transmitted is large. You may. By selecting a wavelength range according to the situation by the power transmission control unit 160, transmission of power and information suitable for the situation can be realized.
  • the wavelength ranges that the power transmission control unit 160 switches depending on the situation may be three or more wavelength ranges, and the plurality of wavelength ranges may partially overlap or may not overlap.
  • the above-mentioned "situation" may include various situations such as a surplus amount of power in the power receiving device 310F, a change in the characteristics (for example, humidity) of the space in which the power feeding light 112 is transmitted, and the like.
  • the power reception device 310F cannot determine the switching. It takes time to do it. Then, it becomes difficult to transmit information during this time.
  • the power transmission control unit 160 and the power reception control unit 380 may perform the following calibration process in order to shorten the time during which it becomes difficult to transmit the information as described above.
  • the first element is the reference value of the power converted from the power feeding light 112 by the power receiving device 310F.
  • the reference value means the magnitude of power converted by the light receiving section 311E when the power supply light 112 of a predetermined wavelength is incident.
  • the predetermined wavelength for example, the maximum wavelength of the wavelength range used for wavelength modulation, the center wavelength of the wavelength range, the minimum wavelength, the i-th wavelength, etc. can be adopted.
  • the demodulation unit 370 compares the magnitude of the power converted by the light receiving unit 311E with the reference value, and determines how far the wavelength of the feeding light is from the wavelength of the reference value. 112 is incident. Therefore, even after the power of the feeding light 112 is switched, the demodulation unit 370 can quickly move on to the demodulation process by performing the calibration process.
  • the second element is a value that can identify the maximum wavelength and minimum wavelength in the wavelength range used in wavelength modulation. Specifically, the magnitude of the power converted by the light receiving unit 311E when the power supply light 112 with the maximum wavelength is incident (the first reference value of power), and the magnitude of the power converted by the light receiving unit 311E when the power supply light 112 with the minimum wavelength is incident. This is the magnitude of the power converted by the light receiving unit 311E (second reference value of power).
  • the demodulation unit 370 can calculate the wavelength range used in wavelength modulation by knowing the above-mentioned first reference value and second reference value. Therefore, the demodulation unit 370 can quickly shift to demodulation processing even after the wavelength region is switched.
  • FIG. 10 is a flowchart illustrating an example of transmission processing performed in the fourth embodiment.
  • a condition is applied that the power of the power supply light 112 is constant during the period in which information is inserted into the power supply light 112.
  • the power transmission control unit 160 When the transmission process starts, the power transmission control unit 160 first selects a first wavelength region 401 that can transmit power with high efficiency, or a second wavelength that can easily transmit a large amount of information, as a wavelength region to be used for wavelength modulation. Area 402 is selected (step S1). Here, the power transmission control unit 160 may select a wavelength region depending on the amount of information to be transmitted and the magnitude of power to be transmitted to the power receiving device 310F.
  • the power transmission control unit 160 and the power reception control unit 380 execute a calibration process (step S2). Specifically, the power transmission control unit 160 controls the light emitting unit 111E to perform a process of switching the wavelength of the power supply light 112 to the maximum wavelength and minimum wavelength of the wavelength range selected in step S1 in a predetermined pattern.
  • the power reception control unit 380 recognizes that the calibration process is being performed, sets the larger power as the first reference value, and sets the smaller power as the first reference value. Power is set as a second reference value.
  • the power reception control unit 380 After setting the first reference value and the second reference value, the power reception control unit 380 sends an acknowledgment (ACK) to the reception unit 170 via the transmission unit 390. Then, when the power transmission control unit 160 receives the confirmation response (YES in step S3), the calibration process ends.
  • ACK acknowledgment
  • the power transmission control unit 160 causes the modulation unit 150 to start modulation processing
  • the power reception control unit 380 causes the demodulation unit 370 to start demodulation processing, thereby executing the process of transmitting power and information via the power supply light 112. (Step S4).
  • step S6 when the transmission of information from the power supply device 110F is completed and the power reception control unit 380 sends an acknowledgment (ACK) to the reception unit 170 via the transmission unit 390 (YES in step S5), both the power and the information The process of simultaneously transmitting the two ends (step S6).
  • ACK acknowledgment
  • the power transmission control unit 160 sets the wavelength of the power supply light 112 to a wavelength at which the light receiving unit 311E has high sensitivity (a wavelength at which power conversion efficiency is high) by controlling the light emitting unit 111E (step S7). Then, the power transmission control unit 160 continues the power transmission process using the power supply light 112 (step S8).
  • the power transmission control unit 160 determines whether an information transmission request has occurred (step S9), and if NO, the transmission process in step S8 is continued, while if YES, Returning to step S4, the information transmission process is restarted. Alternatively, if the determination result in step S9 is YES, the power transmission control unit 160 may return to the process in step S1 and restart the process for transmitting information from the selection of the wavelength region.
  • the demodulator 370 of the power receiving device 310F converts the power supply light 112 based on the magnitude of the power converted by the light receiver 311E and the reference value of the power. Extract the information inserted into. Then, the power reception control unit 380 of the power reception device 310F executes a calibration process to determine the above reference value. Therefore, after at least one of the power and the wavelength range of the power supply light 112 is changed, the power reception control unit 380 quickly determines the above reference value through the calibration process, and the demodulation unit 370 promptly starts the demodulation process. can do.
  • the calibration process is not limited to the above example.
  • the power receiving control unit 380 controls the power of the power feeding light 112 based on the request.
  • a reference value may be determined.
  • the power receiving device 310F has a measuring device that measures the power of the incident power feeding light 112, and performs a calibration process to determine a reference value of power by temporarily measuring the power with the measuring device. Good too.
  • the power supply device 110F includes a power transmission control unit 160 that switches the wavelength range used in wavelength modulation of the power supply light 112. Therefore, the power supply device 110F uses a wavelength range suitable for various situations, such as when the power supply light 112 is required to transmit a large amount of information, or when the power to be transmitted is large or small. 112 allows power and information to be transmitted.
  • the power receiving device is a light receiving unit that converts the incident power supply light into electric power; a demodulator that extracts information included in the feeding light; The information is inserted into the feeding light by wavelength modulation in which the wavelength of the feeding light changes into at least a first wavelength and a second wavelength, The light receiving section has different sensitivity at least at the first wavelength and at the second wavelength, The demodulator extracts the information based on the magnitude of the power converted by the light receiver.
  • the demodulation unit extracts the information based on the reference value of the power magnitude and the power magnitude converted by the light receiving unit
  • the power reception control unit further includes a power reception control unit that performs a calibration process to determine the reference value.
  • the light receiving section is a solar cell.
  • the light receiving section is a photoelectric conversion element.
  • the power supply device is a light emitting unit that outputs power supply light and can change the wavelength of the power supply light to at least a first wavelength and a second wavelength; a modulation unit that inserts information into the feeding light by wavelength modulation that changes the wavelength of the feeding light into at least the first wavelength and the second wavelength; Equipped with The light emitting unit outputs the power supply light having a power according to a predetermined condition at least during a period in which the modulation unit inserts information into the power supply light.
  • the light emitting unit is capable of changing the wavelength of the feeding light into a plurality of wavelengths including at least a maximum wavelength and a minimum wavelength in a first wavelength region and a plurality of wavelengths including at least a maximum wavelength and a minimum wavelength in a second wavelength region. and The first wavelength region and the second wavelength region are different regions that partially overlap, or different regions that do not overlap,
  • the modulation unit is capable of wavelength modulation using the first wavelength region and wavelength modulation using the second wavelength region, Furthermore, a power transmission control section is provided that switches the modulation of the feeding light by the modulation section between wavelength modulation using the first wavelength region and wavelength modulation using the second wavelength region.
  • the optical power supply system is Comprising a power feeding device and a power receiving device
  • the power supply device includes: a light emitting unit that outputs power supply light and can change the wavelength of the power supply light to at least a first wavelength and a second wavelength; a modulator that includes information in the feeding light by wavelength modulation that changes the wavelength of the feeding light into at least the first wavelength and the second wavelength; has
  • the power receiving device includes: a light receiving unit that converts the incident power supply light into electric power; a demodulator that extracts information included in the power supply light;
  • the light receiving section has different sensitivity at least at the first wavelength and at the second wavelength, The demodulator extracts the information based on the magnitude of the power converted by the light receiver.
  • the power supply method is Information is inserted by wavelength modulation into the feeding light whose power is in accordance with predetermined conditions, and the feeding light into which the information has been inserted is sent out.
  • the optical power supply method is While transmitting power by sending out power light with information inserted through wavelength modulation,
  • the power supply light is received by a light-receiving unit whose sensitivity differs depending on the wavelength, the power reception is performed by converting the power supply light into electric power, and the magnitude of the power changes in response to a change in the wavelength of the power supply light.
  • the information is extracted based on.
  • the present disclosure can be used in a power receiving device, a power feeding device, an optical power feeding system, a power receiving method, a power feeding method, and an optical power feeding method.
  • Optical power supply system 110, 110E, 110F Power supply device 111 Power supply semiconductor laser 111E Light emitting unit 112 Power supply light 150 Modulation unit 160 Power transmission control unit 170 Receiving unit 200 Optical fiber cable 200A Optical fiber cable 200B Optical fiber cable 310, 310E, 310F Power receiving device 311 Photoelectric conversion element 311E Light receiving section 370 Demodulating section 380 Power receiving control section 390 Transmitting section 392 Data ⁇ 1 to ⁇ n First wavelength to nth wavelength 401 First wavelength region 402 Second wavelength region

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un dispositif de réception d'énergie, un dispositif d'alimentation en énergie, un système d'alimentation en énergie optique, un procédé de réception d'énergie, un procédé d'alimentation en énergie et un procédé d'alimentation en énergie optique, par lesquels l'énergie et les informations peuvent être transmises simultanément par l'intermédiaire d'une lumière d'alimentation. De l'énergie est transmise par distribution d'une lumière d'alimentation dans laquelle des informations sont insérées par modulation de longueur d'onde ; pendant ce temps, l'énergie est reçue de telle sorte que la lumière d'alimentation est reçue par une unité de réception de lumière ayant une sensibilité différente selon une longueur d'onde et la lumière d'alimentation est convertie en énergie, et des informations sont extraites sur la base de la quantité d'énergie qui change en fonction d'un changement de longueur d'onde de la lumière d'alimentation.
PCT/JP2023/017234 2022-05-20 2023-05-08 Dispositif de réception d'énergie, dispositif d'alimentation en énergie, système d'alimentation en énergie optique, procédé de réception d'énergie, procédé d'alimentation en énergie et procédé d'alimentation en énergie optique WO2023223857A1 (fr)

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JP2022082795A JP2023170776A (ja) 2022-05-20 2022-05-20 受電装置、給電装置、光給電システム、受電方法、給電方法及び光給電方法
JP2022-082795 2022-05-20

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WO2023223857A1 true WO2023223857A1 (fr) 2023-11-23

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06112904A (ja) * 1992-08-10 1994-04-22 Sharp Corp 空間光伝送装置
JP2021068935A (ja) * 2019-10-18 2021-04-30 京セラ株式会社 光給電システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06112904A (ja) * 1992-08-10 1994-04-22 Sharp Corp 空間光伝送装置
JP2021068935A (ja) * 2019-10-18 2021-04-30 京セラ株式会社 光給電システム

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