JP2022185714A - Reuse system for wireless power supply - Google Patents

Abstract

To provide a reuse system for wireless power supply that reuses electromagnetic waves deviated from an antenna of a power receiver as power when an electronic apparatus or the like is wirelessly supplied with power.SOLUTION: A reuse system 10 for wireless power supply includes: a power transmitter 1 connected with a power supply and having a power transmitting antenna for transmitting electromagnetic waves for power transmission; a power receiver 2 having a first power receiving antenna for receiving electromagnetic waves; an electromagnetic wave reflection structure 3 for reflecting electromagnetic waves which the power receiver 2 was not able to receive; a reuse device 4 having a second power receiving antenna for receiving the electromagnetic waves reflected by the electromagnetic wave reflection structure 3. The reuse system converts the electromagnetic waves received by the reuse device 4 into power and reuses it. The power transmitter 1 and the solar cell 13 are integrated to form a power transmitter-equipped solar cell 101.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a reuse system for wireless power supply.

In recent years, mobile devices such as portable information terminals represented by smart phones and tablet terminals, notebook PCs, and portable game machines have been actively developed. Furthermore, wearable devices such as smart glasses, smart bracelets, and smart watches are being actively developed. These electronic devices are often equipped with a secondary battery that can be repeatedly charged or discharged, but it is difficult to mount a large-capacity battery because there is a demand for miniaturization and weight reduction. Therefore, there has been a tendency that the continuous use time is limited.

Against this background, wireless power supply systems have been developed that wirelessly transmit power from a power transmission device to small electronic devices such as personal digital assistants and smart watches (for example, Patent Documents 1 and 2).

WO2020/230194 JP 2016-073196 A

When wirelessly transmitting power from a power transmitting device to a power receiver in a non-contact manner, electromagnetic waves may be generated that deviate from the antenna of the electronic device, resulting in power reception loss. In particular, small electronic devices such as mobile information terminals and wearable devices are required to be smaller and lighter, so it is necessary to reduce the size of the antenna. There is

The present disclosure is an invention that has been made in view of the above problems. The main purpose is to provide a system.

In order to achieve the above object, one embodiment of the present disclosure is a power transmitter having a power transmitting antenna that transmits an electromagnetic wave for power transmission, connected to a power supply, and a power receiver having a first power receiving antenna that receives the electromagnetic wave. and an electromagnetic wave reflecting structure for reflecting electromagnetic waves not received by the power receiver, and a recycler having a second power receiving antenna for receiving the electromagnetic waves reflected by the electromagnetic wave reflecting structure, wherein the reuse To provide a reuse system for wireless power supply, which reuses electromagnetic waves received by a device as electric power.

Another embodiment of the present disclosure includes: a power transmitter having a power transmitting antenna that transmits an electromagnetic wave for power transmission, a power receiver having a first power receiving antenna that receives the electromagnetic wave, and the power receiver receiving the electromagnetic wave. and an electromagnetic wave absorbing structure that absorbs electromagnetic waves not absorbed by the electromagnetic wave absorbing structure, and reuses the electromagnetic waves absorbed by the electromagnetic wave absorbing structure as electric power.

In the present disclosure, it is possible to provide a reuse system for wireless power supply that can reuse electromagnetic waves deviated from the antenna of the power receiver as power when wireless power is supplied to a power receiver such as an electronic device. Play.

1 is a schematic diagram illustrating a reuse system for wireless power supply according to a first embodiment of the present disclosure; FIG. 1 is a conceptual configuration example of a reuse system for wireless power supply according to a first embodiment of the present disclosure; 1 is a schematic cross-sectional view illustrating an electromagnetic wave reflecting structure according to the first embodiment of the present disclosure; FIG. FIG. 4 is a schematic cross-sectional view illustrating a second power receiving antenna of the recycler in the first embodiment of the present disclosure; 4 is a schematic cross-sectional view illustrating a first power receiving antenna of the power receiver in the first embodiment of the present disclosure; FIG. 1 is a schematic diagram illustrating a power receiver in the first embodiment of the present disclosure; FIG. FIG. 2 is a schematic diagram illustrating a reuse system for wireless power supply according to a second embodiment of the present disclosure; FIG. 2 is a conceptual configuration example of a reuse system for wireless power supply according to a second embodiment of the present disclosure; FIG. FIG. 2 is a circuit diagram illustrating a power receiving unit of a recycler in the reuse system for wireless power supply according to the first embodiment of the present disclosure;

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings and the like. However, the present disclosure can be embodied in many different modes and should not be construed as limited to the description of the embodiments exemplified below. In addition, in order to clarify the description, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the embodiment, but this is only an example, and the interpretation in the present disclosure is limited. not something to do. In addition, in this specification and each figure, the same reference numerals may be given to the same elements as those described above with respect to the existing figures, and detailed description thereof may be omitted as appropriate. Also, for convenience of explanation, the terms "upper" and "lower" may be used, but the up-down direction may be reversed.

Also, in this specification, there is no particular limitation when a configuration such as a member or a region is “above (or below)” another configuration such as another member or another region. So far, this includes not only when directly above (or directly below) other structures, but also when above (or below) other structures, i.e. above (or below) other structures and between other structures. Including cases where the constituent elements of are included.

A. Reuse system for wireless power supply (first embodiment)
A reuse system for wireless power supply according to this embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of a reuse system for wireless power supply according to this embodiment. In the reuse system 10 for wireless power supply shown in FIG. 1, the power transmitter 1 is attached to the ceiling and window frame of the factory. Also, people in the factory wear smart glasses as the power receivers 2 . An electromagnetic wave reflecting structure 3 is installed on the floor of the factory. Furthermore, a recycle device 4 is installed in the factory.
The power transmitter 1 transmits an electromagnetic wave W for power transmission to the power receiver 2 , and the power receiver 2 receives the electromagnetic wave W transmitted from the power transmitter 1 . Electromagnetic waves W not received by the power receiver 2 are reflected by the electromagnetic wave reflecting structure 3 . The recycle device 4 receives electromagnetic waves that are not received by the power receiver 2 . The electromagnetic waves received by the reuser 4 are reused as electric power. For example, the generated power is supplied to the power transmitter 1 and circulated and reused.
As shown in FIG. 1, the power transmitter 1 is preferably electrically connected to a solar cell 13 as a power source. 101 is preferably configured. In this specification, power supply using a radio signal is referred to as wireless power supply.

FIG. 2 shows a conceptual configuration example of the reuse system for wireless power supply according to this embodiment. A reuse system 10 for wireless power feeding shown in FIG. 2 includes a power transmitter 1 connected to a power source and having a power transmitting antenna 12a for transmitting an electromagnetic wave W for power transmission, and a power receiver having a first power receiving antenna 21a for receiving the electromagnetic wave. 2, an electromagnetic wave reflecting structure 3 that reflects electromagnetic waves not received by the power receiver, and a reuser 4 having a second power receiving antenna 41a that receives the electromagnetic waves reflected by the electromagnetic wave reflecting structure.

According to the wireless power supply reuse system of the present embodiment, when wirelessly powering a power receiver such as an electronic device, electromagnetic waves deviated from the antenna of the power receiver can be reused as power. Furthermore, electromagnetic waves that have deviated from the antenna of the power receiver are reflected in the surroundings, and interference with primary electromagnetic waves for power transmission and other information communication signals can be suppressed.

I. Electromagnetic Wave Reflecting Structure The electromagnetic wave reflecting structure reflects electromagnetic waves that have not been received by the power receiver, which is the destination of power transmission, toward the recycle device, which will be described later. Electromagnetic waves not received by the receiver are incident on the electromagnetic wave reflecting structure at a predetermined angle from a predetermined direction. It is preferable that the electromagnetic wave reflecting structure is designed to reflect the electromagnetic waves incident from the power transmitter at a predetermined angle so as to concentrate them on the recycle device.

FIG. 3 is a schematic cross-sectional view showing an example of the electromagnetic wave reflecting structure according to this embodiment. The electromagnetic wave reflecting structure 3 shown in FIG. 3 has a reflecting layer 31 configured by arranging a plurality of mirrors M. A cover material 32 is arranged above the reflecting layer 31, and a base material 33 is arranged below the reflecting layer 31. ing. The base material 33 is made of a material capable of supporting the electromagnetic wave reflecting structure 3 . Moreover, the cover material 32 is made of a material that allows transmission of electromagnetic waves transmitted from the power transmitter. Specific examples of such materials include any one or more of In, Sn, Cu, and Al. For example, an indium tin oxide film (ITO film) is preferable. The cover material may contain tin oxide SnO ₂ in order to ensure radio wave transmittance, and the content of tin oxide SnO ₂ may be 0% by mass or more and 20% by mass or less. The thickness of the cover material is, for example, 18 nm or more. Moreover, from the viewpoint of maintaining transparency, the thickness is preferably 100 nm or less. Since the film structure of the cover material 32 is an amorphous structure, it is possible to realize a characteristic of transmitting wavelengths in a desired range. The crystal form of the amorphous structure is composed of particles of about 100 nm.

A plurality of mirrors in the reflective layer are installed so that the tilt angle can be adjusted, and are installed in a posture that converges the reflected waves toward the recycle device. A plurality of mirrors in the reflective layer may have different tilt angles. Also, the mirror may have a planar shape or a curved shape. This is because the curved surface shape facilitates obtaining a light condensing function.

The mirror preferably has a metal film on its surface. The metal film is preferably a deposited film of metal such as silver, copper, gold and aluminum. The metal film may be a vapor deposition film formed by a vapor deposition method or a coat film formed by a coating method such as coating, but is preferably a vapor deposition film. In the case of a deposited film, it may be formed by one-time deposition or the like, or may be formed by multiple-time deposition, but the latter is preferred. This is because a high reflectance can be obtained.

Examples of such an electromagnetic wave reflecting structure include a mode using the above-described mirror, and a mode using a retroreflective structure that reflects an incident electromagnetic wave at an output angle that is the same as the incident angle of the incident electromagnetic wave. be able to.
In addition, when the electromagnetic wave reflecting structure is a mode using a retroreflecting structure, it is preferable that the recycler is arranged around the antenna of the power transmitter.

The electromagnetic wave reflecting structure described above is preferably arranged on the floor surface, wall surface, or the like of a building. Also, in the case of a clean room or the like, it may be arranged under the floor. When arranged under the floor, it is preferable that the floor material has high electromagnetic wave permeability to transmit electromagnetic waves transmitted from the power transmitter.

II. Recycler The recycler receives electromagnetic waves that are not received by the receiver but are reflected by the electromagnetic wave reflecting structure. As shown in FIG. 2 , the recycle device 4 has a power receiving section 41 having a second power receiving antenna 41 a that receives the electromagnetic waves reflected by the electromagnetic wave reflecting structure 3 . Moreover, the power receiving unit 41 may include a receiving circuit 41b (including, for example, a rectifying circuit). Furthermore, the recycle device 4 may include a control unit 42 and a storage battery 43 in addition to the power receiving unit 41 .

(1) Power Receiving Unit The second power receiving antenna 41 a receives electromagnetic waves that are not received by the power receiver 2 but are reflected by the electromagnetic wave reflecting structure 3 . The shape of the second power receiving antenna 41a can be determined according to the transmission method.

The number of antenna elements of the second power receiving antenna is not particularly limited, but may be one or may be composed of a plurality of antenna elements. When it is composed of a plurality of antenna elements, the plurality of antenna elements may be arranged in a straight line, or may form a planar or curved array antenna.

Specifically, a linear conductive film (for example, a dipole antenna as shown in FIG. 4A) or a flat conductive film (for example, a patch antenna as shown in FIG. 4B) is used as an antenna. can be used. For the second power receiving antenna 41a, the length and shape of the conductive film that functions as an antenna may be appropriately set in consideration of the wavelength of the electromagnetic wave.

For example, when designing the dipole antenna shown in FIG. 52 (10) can be set with a width of 0.52 mm and a pitch of 2 mm.

Also, when designing the patch antenna shown in FIG. can be set to have a width of 0.63 mm and a pitch of 2 mm. In FIG. 4, reference numeral 50 denotes a dielectric substrate (for example, PET substrate), and 51 denotes an antenna element.

The area of the second power receiving antenna of the recycler is not particularly limited, but may be 9 cm ² or more, preferably 900 cm ² or more. If it is less than the above value, the area of the second power receiving antenna becomes small, and electromagnetic waves deviating from the antenna of the power receiver cannot be sufficiently received. On the other hand, for example, it can be 1 m ² or less, and may be 3600 cm ² or less. In addition, the area of the second power receiving antenna 41a refers to the area of a region surrounded by the plurality of antenna elements when the second power receiving antenna 41a includes a plurality of antenna elements.

The receiving circuit 41b includes, for example, a capacitor, a resistor, a rectifying circuit, a resonance circuit, and the like.
The rectifier circuit converts the electromagnetic waves received by the second power receiving antenna 41a into DC power. FIG. 9 shows a circuit diagram illustrating the power receiving unit of the recycle device in this embodiment. In FIG. 9, the receiving circuit 41b is a rectifier circuit composed of four diodes and capacitors.

The generated power may be supplied to and stored in a storage battery 43, which will be described later, or may be stored in a storage battery other than the storage battery of the recycle device (for example, the storage battery 14 of the solar battery with power transmitter 101). Alternatively, the power may be supplied directly to the power transmitter 1 for cyclical use, for example, without being stored in a storage battery. From the viewpoint of suppressing energy loss, power transmission from the recycle device to the power transmitter side (the power transmitter or the storage battery of the solar cell with power transmitter) is preferably performed by wire.

The recycle device 4 in this embodiment may include, for example, a control unit 42 and a storage battery 43 in addition to the power receiving unit 41 .
The control unit 42 is means for controlling the recycle device 4, and is configured by, for example, a CPU (Central Processing Unit). The control unit can, for example, adjust the amount of power transmitted to the power transmitter. For example, it is preferable to set so that power is transmitted when the amount of charge in the storage battery reaches a predetermined amount. Further, in this embodiment, it is also possible to remotely control the recycle device 4 from a control unit such as a server installed outside the recycle device 4 .

The recycle device 4 in this embodiment may or may not have the storage battery 43 . If the recycle device does not have a storage battery, the cyclically reused power may be stored, for example, in a storage battery of a solar battery with a power transmitter.

In the reuse system for wireless power supply of this embodiment, the number of reuse devices may be one or plural.

Examples of the shape of the recycler include cylindrical, conical, rectangular parallelepiped, torch, plate, and flat plate shapes. Further, a rectangular parallelepiped shape is preferable for the power receiving antenna of the recycle device to efficiently receive reflected waves from the electromagnetic wave reflecting structure. Moreover, if it is flat, it is easy to install on furniture or the like.

The recycler is preferably fixed to a predetermined position such as a wall, floor, or underfloor of the building. This is because the design of the reflecting structure is easier than when the recycler is movable. In the case of fixing under the floor, there are fewer obstacles to the recycler than in the case of fixing on the floor. When fixed under the floor, it is preferable that the floor material has high permeability for electromagnetic waves transmitted from the power transmitter. Also in this case, the reflecting structure is preferably arranged under the floor.

III. Power Transmitter The power transmitter converts the electric power obtained from the power supply into radio waves and radiates them toward the power receiver, thereby performing wireless power feeding to the power receiver in a contactless manner.
As shown in FIG. 2, the power transmitter 1 usually has a power transmission section 12 including a power transmission antenna 12a, and the power transmission section 12 may further include a transmission circuit 12b. The transmitter 1 typically includes a mains connection 11 . The power transmitter 1 is preferably integrated with a solar cell 13 functioning as a power source to form a power transmitter-equipped solar cell 101 . In this case, the solar cell with power transmitter 101 preferably has a storage battery 14 . The power transmitter 1 or the power transmitter-equipped solar cell 101 may include other electronic elements such as the control unit 15 and the communication unit 16 .

The method of transmitting electromagnetic waves between the power transmitter 1 and the power receiver 2 is not particularly limited as long as it is a wireless power supply method, and may be any of a microwave method, a laser method, an electromagnetic induction method, and a magnetic resonance method. In the microwave discharge method, for example, radio waves in frequency bands such as 920 MHz band, 2.4 GHz band, 5.7 GHz band, and 24 GHz band may be used.

(1) Power Connection Portion The power connection portion 11 is connected to, for example, a power source that supplies power, and distributes the power supplied from the power source to each portion of the device. Alternating current power supplied from a power supply may be converted into direct current power by a rectifier. Also, the power supply connection section may step up or step down the voltage by a DC-DC converter. Examples of the power source include an external power source such as an outlet and a solar cell, with the solar cell being preferred.

A solar cell is a direct-current power source that receives sunlight to generate electricity, and the solar cell used is not particularly limited, and any solar cell such as a silicon-based, compound-based, or organic-based solar cell can be used. be able to. In the present disclosure, it is preferable to use commercially available silicon solar cells such as amorphous silicon type solar cells. Solar cells are used, for example, as solar panels installed on factory roofs and windows.

(2) Solar Cell with Power Transmitter In particular, in the present embodiment, it is preferable that the solar cell functioning as a power source and the power transmitter are integrated to form the solar cell with power transmitter 101 . By integrating the power transmitter with the solar cell, the circuit between the power transmitter and the solar cell can be shortened, and energy loss due to circuit resistance can be reduced.

In the present disclosure, the fact that the solar cell and the power transmitter are integrated means not only the state in which the power transmitter is arranged in the solar cell itself, but also the state in which the solar cell is arranged on the roof and the power transmitter is installed in the ceiling below. It also includes the case where they are electrically connected and arranged at a short distance, such as being arranged. Specifically, as long as they are placed in the same building and are electrically connected, the solar cell and the power transmitter are integrated in the present disclosure.

When a solar cell is used as a power source, the amount of power generated by the solar cell varies depending on the intensity of sunlight and the like. Therefore, it is preferable that the solar cell with power transmitter further includes a storage battery. This is because it is possible to steadily transmit power to the power receiver.

A storage battery can store electric power supplied from a power source. Examples of secondary batteries that can be used as storage batteries include lead-acid batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lithium ion batteries, lithium polymer batteries, and vanadium batteries.

(3) Power Transmission Unit The power transmission unit 12 has a power transmission antenna 12a and a transmission circuit 12b.
The transmission circuit 12b has a transmission signal processing function, and generates a signal in a predetermined frequency band from the power obtained by the power supply connection section 11, for example, based on the control of the control section 15. FIG. The transmission circuit 12b includes, for example, an inverter circuit.

The power transmission antenna 12a wirelessly transmits the signal generated by the transmission circuit 12b to the power receiver 2 as an electromagnetic wave. The shape of the antenna of the power transmission antenna 12a can be determined according to the transmission method. For example, in the microwave discharge method, a linear conductive film (eg, dipole antenna) or a flat conductive film (eg, patch antenna) can be used as an antenna. The length and shape of the conductive film functioning as an antenna may be set as appropriate in consideration of the wavelength of the electromagnetic wave. In order to utilize electromagnetic induction due to changes in electric field density, a ring-shaped conductive film (eg, loop antenna), a spiral conductive film (eg, spiral antenna), or the like can be used as an antenna. Note that the shape of the conductive film functioning as an antenna is not limited to these.

The number of antenna elements of the power transmission antenna is not particularly limited, but may be one or may be composed of a plurality of antenna elements. When it is composed of a plurality of antenna elements, the plurality of antenna elements may be arranged in a straight line, or may form a planar or curved array antenna. In order to increase power transmission efficiency, the power transmission antenna may have a function of controlling the phase of the radio waves by interlocking a plurality of antenna elements to give directionality to the power transmission of the radio waves. In addition, it may have a communication function with the power receiver in order to detect the position of the power receiver, detect the required amount of power, and efficiently transmit the required amount to the required position at the required time. .

(4) Other Electronic Elements The control section 15 is connected to each section constituting the power transmitter 1 . The control unit 15 is means for controlling the power transmitter 1, and is configured by, for example, a CPU (Central Processing Unit).

The communication unit 16 communicates with the power receiver 2 under the control of the control unit 15, for example. The power transmitter 1 may perform wireless communication using the power transmission antenna 12 a of the power transmission section 12 instead of the communication section 16 . The communication unit may transmit information related to wireless power transmission, such as a response to a wireless power transmission request, to the power receiver. Also, the communication unit may receive a request for wireless power transmission and information on wireless power transmission, such as a pilot signal that notifies the position of the wireless repeater, from the power receiver.

The power transmitter is preferably installed on the ceiling, window frame, or the like of a building such as a factory, a residence, or a commercial facility. The number of power transmitters arranged in the reuse system for wireless power supply of the present embodiment is not particularly limited, and may be one or plural. Preferably, a predetermined number of power transmitters are arranged at regular intervals.

IV. Power Receiver The power receiver in this embodiment is a device that receives electromagnetic waves from a power transmitter and operates using the generated power as a drive source.

As shown in FIG. 2 , the power receiver 2 has a power receiving section 21 having a first power receiving antenna 21 a that receives electromagnetic waves transmitted from the power transmitter 1 . Moreover, the power receiving unit 21 may include a receiving circuit 21b (including, for example, a rectifying circuit). Further, the power receiver 2 may have a drive section 22 and a communication section 23 that operate the power receiver. Moreover, it is preferable that the power receiver 2 is also provided with a storage battery.

Examples of the first power receiving antenna 21a of the power receiver 2 include the same types as the second power receiving antenna in "II. Recycler" and the power transmitting antenna in "III. Power transmitter" described above.

The area of the first power receiving antenna 21a of the power receiver 2 is not particularly limited, but may be 50 cm ² or less, preferably 9 cm ² or less. In the present embodiment, even in a power receiver with such a small antenna size (for example, a small electronic device), the electromagnetic waves deviated from the antenna can be reused as power, so that the energy utilization efficiency can be improved. can be done. On the other hand, it is, for example, 1 cm ² or more, and may be 3 cm ² or more.

The first power receiving antenna of the power receiver preferably has a prism body or lens for refracting and dispersing electromagnetic waves on the antenna element included in the first power receiving antenna. 5A and 5B are schematic cross-sectional views of the first power receiving antenna 21a having the prism body 55 on the antenna element 58. FIG. FIG. 5(c) is a schematic cross-sectional view of the first power receiving antenna 21a having a lens 57 on the antenna element 58. FIG. Any resin material can be used as the material of the prism body and the lens. The prism body and the lens should be configured so as to guide the traveling direction of the electromagnetic wave to the antenna element by utilizing the difference in refractive index. The shape of the prism body can be changed as appropriate, and may be triangular, semicircular, trapezoidal, columnar, or conical. A part of the prism body 55 may be a mirror 56 as shown in FIG. 5(b).

The receiving circuit 21b in the power receiving unit 21 is the same as the receiving circuit 41b described in the above-mentioned "II. Recycler", so the description is omitted here.

The communication unit 23 communicates with the power transmitter 1, for example. The power receiver 2 may perform wireless communication using the first power receiving antenna 21 a of the power receiving section 21 instead of the communication section 23 . The communication unit may transmit information related to wireless power transmission, such as a request for wireless power transmission and a pilot signal for notifying the position of the power receiver, to the power transmitter. The communication unit may also receive information on wireless power transmission, such as a response to a request for wireless power transmission, from the power transmitter.

In this embodiment, the power receiver is preferably a wirelessly powered compact electronic device. Furthermore, it is preferable that the wireless power supply type compact electronic device has a form in which a power receiving sheet having a power receiving portion is arranged in the small electronic device main body. FIG. 6 shows smart glasses as a power receiver in this embodiment. In the power receiver 2 shown in FIG. 6(a), a power receiving sheet S1 having a power receiving unit 21 is arranged on a smart glass main body (small electronic device main body) X. As shown in FIG.

Further, as shown in FIGS. 6B and 6C, the power receiving sheet S1 may be covered with a radio wave absorbing sheet S2. FIG. 6(c) is a plan view of the power receiver of FIG. 6(b) viewed from the power receiving sheet S1 side. This is because the radio wave absorption sheet S2 absorbs the electromagnetic waves that deviate from the power receiving sheet S1, thereby suppressing the irradiation of the peripheral devices and the human body. In FIGS. 6B and 6C, a radio wave absorbing sheet S2 having a size larger than that of the power receiving sheet S1 is placed between the power receiving sheet S1 and the smart glass main body (small electronic device main body) X, thereby It covers the periphery of the sheet S1. Examples of radio wave absorbing sheets include resin layers containing fine particles of ferrite, graphene, iron, and the like.

Small electronic devices are preferably devices that are always charged. Examples include smart glasses, smart bracelets, smart watches, face masks, wearable devices such as face shields, notebook PCs, tablet terminals, cameras, A sensor etc. are mentioned.

V. Others Since the wireless power supply reuse system of the present disclosure is a reuse system that uses reflected waves, it is preferably used indoors in buildings or in vehicles. Examples of buildings include factories, residences, commercial facilities, and the like. Vehicles include automobiles, trains, aircraft, and the like. Further, the reuse system for wireless power supply of the present disclosure may be used outdoors.

B. Reuse system for wireless power supply (second embodiment)
A second embodiment of a reuse system for wireless power supply according to the present disclosure includes a power transmitter having a power transmitting antenna that transmits an electromagnetic wave for power transmission, which is connected to a power supply, and a power receiver that has a first power receiving antenna that receives the electromagnetic wave. and an electromagnetic wave absorbing structure for absorbing electromagnetic waves not received by the power receiver, wherein the electromagnetic waves absorbed by the electromagnetic wave absorbing structure are reused as electric power.
A reuse system for wireless power feeding according to this embodiment will be described with reference to the drawings. FIG. 7 is a schematic diagram showing an example of a reuse system for wireless power supply according to this embodiment. In the reuse system 100 for wireless power supply shown in FIG. 7, the power transmitter 1 is attached to the ceiling and window frame of the factory. Also, people in the factory wear smart glasses as the power receivers 2 . Electromagnetic wave absorbing structures 5 are installed on the floor and walls of the factory. Further, a repeater 6 is installed on the outer wall of the factory.
The power transmitter 1 transmits an electromagnetic wave W for power transmission to the power receiver 2 , and the power receiver 2 receives the electromagnetic wave W transmitted from the power transmitter 1 . Electromagnetic waves not received by the power receiver 2 are absorbed by the electromagnetic wave absorbing structure 5 . The electromagnetic waves absorbed by the electromagnetic wave absorbing structure 5 are reused as electric power. For example, the power is stored as power in the repeater 6, supplied to the power transmitter 1, and cyclically reused.
As shown in FIG. 7, the power transmitter 1 is preferably electrically connected to a solar cell 13 as a power source. preferably constitutes 101

FIG. 8 shows a conceptual configuration example of the reuse system for wireless power supply according to this embodiment. A reuse system 100 for wireless power feeding shown in FIG. 8 includes a power transmitter 1 connected to a power source and having a power transmitting antenna 12a for transmitting an electromagnetic wave W for power transmission, and a power receiver having a first power receiving antenna 21a for receiving the electromagnetic wave. 2 and an electromagnetic wave absorbing structure 5 for absorbing electromagnetic waves not received by the receiver. Further, the reuse system 100 for wireless power feeding of the present embodiment may have the repeater 6 .

According to the wireless power supply reuse system of the present embodiment, when wireless power is supplied to a power receiver such as an electronic device, electromagnetic waves deviated from the antenna of the power receiver can be reused as electric power, so energy utilization efficiency is improved. improves. Furthermore, the electromagnetic waves deviating from the power receiver are reflected in the surroundings, and interference with the primary electromagnetic waves for power transmission and other information communication signals can be suppressed. In addition, since surplus energy can be suppressed from accumulating in the room, it is possible to suppress an increase in room temperature.

As the power transmitter and the power receiver in this embodiment, "A. Reuse system for wireless power supply (first embodiment) III. Power transmitter" and "A. IV.

I. Electromagnetic Wave Absorbing Structure The electromagnetic wave absorbing structure absorbs electromagnetic waves that are not received by the power receiver that is the destination of the power transmission. The electromagnetic waves absorbed by the electromagnetic wave absorbing structure are converted into electric power, transmitted to a power transmitter, and reused.

The electromagnetic wave absorbing structure has an electromagnetic wave absorber. The electromagnetic wave absorber is preferably a second power receiving antenna that receives electromagnetic waves. As will be described later, the electromagnetic wave absorbing structure is preferably arranged over a wide area on the floor and walls of the building, so the electromagnetic wave absorbing structure preferably has a configuration in which a plurality of second power receiving antennas are laid out. The second power receiving antenna is preferably composed of, for example, a metal such as silver, copper, gold, aluminum, or graphite, and may be covered with a resin layer so that the wiring is not visible.

As the electromagnetic wave absorbing structure, in addition to the above-mentioned second power receiving antenna, for example, a wall cover sheet, wallpaper, cloth, curtain, floor decoration sheet, rug, carpet, etc. may include a patterned layer that absorbs specific radio waves. and the like.

The electromagnetic wave absorbing structure is preferably arranged over a wide area on the floor and walls of the building. The electromagnetic wave absorbing structure may be transparent so as not to impair the design of the floor and walls. Further, the electromagnetic wave absorbing structure may have a colored layer such as a printed layer on its surface. This is because it can also be used as an indoor decoration. The colored layer is not particularly limited as long as it is transparent to the electromagnetic waves transmitted from the power transmitter, and may be composed of, for example, indium, tin, aluminum, or the like. For the purpose of ensuring transparency, it may be contained in the film in such a fine shape that it cannot be visually recognized.

II. Repeater It is preferable that the repeater can store electromagnetic waves absorbed by the electromagnetic wave absorbing structure as electric power. That is, it is preferable to have a storage battery. Moreover, it is preferable that the repeater has, for example, a receiving circuit, a rectifying circuit, etc., in addition to the storage battery. The location of the repeater is not particularly limited, and may be indoors or outdoors. From the viewpoint of suppressing energy loss, it is preferable that the repeater and the electromagnetic wave absorbing structure and the repeater and the power transmitter (or the power transmitter-equipped solar cell) are connected by wire.

III. Others The reuse system for wireless power supply in this embodiment can be linked with an air conditioner. That is, the generated power may be supplied to the power transmitter to be used for wireless power supply again, or may be supplied as driving power for the air conditioner. For example, in winter, the power can be supplied as drive power for heating equipment without being supplied to the power transmitter. Alternatively, the electromagnetic wave absorbing structure itself may be used as a heating element without being supplied to any of them.

The reuse system for wireless power supply of the present disclosure is preferably used indoors in buildings or in vehicles. Examples of buildings include factories, residences, commercial facilities, and the like. Vehicles include automobiles, trains, and the like. Further, the reuse system for wireless power supply of the present disclosure may be used outdoors.

Note that the present disclosure is not limited to the above embodiments. The above embodiment is an example, and any device that has substantially the same configuration as the technical idea described in the claims of the present disclosure and achieves the same effect is the present invention. It is included in the technical scope of the disclosure.

DESCRIPTION OF SYMBOLS 1... Power transmitter 2... Power receiver 3... Electromagnetic wave reflection structure 4... Recycler 5... Electromagnetic wave absorption structure 6... Repeater 10, 100... Reuse system for wireless power supply 13... Solar cell 101... Solar cell with transmitter

Claims (8)

a power transmitter having a power transmitting antenna for transmitting electromagnetic waves for power transmission, connected to a power source;
a power receiver having a first power receiving antenna that receives the electromagnetic wave;
an electromagnetic wave reflecting structure that reflects electromagnetic waves not received by the power receiver;
a reuser having a second power receiving antenna that receives the electromagnetic wave reflected by the electromagnetic wave reflecting structure;
A reuse system for wireless power supply, wherein the electromagnetic wave received by the reuser is reused as electric power. 2. The reuse system for wireless power supply according to claim 1, wherein said reuser has a storage battery. 3. The recycler for wireless power supply according to claim 1, wherein said electromagnetic wave reflecting structure is designed to reflect, toward said recycler, an electromagnetic wave incident from said power transmitter at a predetermined angle. system of use. 4. The electromagnetic wave reflecting structure according to any one of claims 1 to 3, wherein the electromagnetic wave reflecting structure is a retroreflecting structure, and the recycler is arranged around the power transmission antenna of the power transmitter. wireless power supply reuse system. a power transmitter having a power transmitting antenna for transmitting electromagnetic waves for power transmission, connected to a power source;
a power receiver having a first power receiving antenna that receives the electromagnetic wave;
an electromagnetic wave absorbing structure that absorbs electromagnetic waves not received by the power receiver;
A reuse system for wireless power supply, wherein the electromagnetic wave absorbed by the electromagnetic wave absorbing structure is reused as electric power. 6. The reuse system for wireless power supply according to claim 5, wherein said electromagnetic wave absorbing structure is transparent. 7. The reuse system for wireless power supply according to claim 5, wherein said electromagnetic wave absorbing structure has a second power receiving antenna for receiving said electromagnetic wave. 8. The reuse system for wireless power supply according to any one of claims 5 to 7, further comprising a repeater connected to said electromagnetic wave absorbing structure by wire, said repeater comprising a storage battery. .

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