WO2021111880A1 - Wireless power transmission unit, wireless power transmission system, installation method for wireless power transmission unit - Google Patents

Abstract

A wireless power transmission unit (1) that: is to be installed in a room (100) that has a wall (110), a ceiling (120), and a floor (130); and comprises light control glass (10), power reception coils (21), and power transmission coils (31) that wirelessly transmit power for driving the light control glass (10) to the power reception coils (21). The light control glass (10) is attached to the wall (110), the power reception coils (21) are installed in the wall (110), and all or a portion of the power transmission coils (31) are installed behind the ceiling (120) and/or under the floor (130).

Description

Installation method of wireless power transmission unit, wireless power transmission system, wireless power transmission unit

The present disclosure relates to a wireless power transmission unit and a wireless power transmission system that wirelessly transmit power for driving a dimming glass, and a method of installing the wireless power transmission unit.

A dimming glass that can change the light transmittance is known. Dimmable glass is used, for example, for windows of buildings and vehicles. In recent years, from the viewpoint of building green buildings and healthy construction, the number of buildings introducing dimming glass is increasing mainly in Europe and the United States. For example, by changing the dimming glass provided in the window of a building to be transparent in the daytime and opaque at night, it is possible to collect sunlight indoors in the daytime and protect privacy at night. Further, the rise in the indoor temperature can be suppressed by changing the dimming glass provided in the window of the building or the window of the automobile to be opaque to block the outside light.

The electrochromic method and the gas chromic method are known as methods for changing the light transmittance of the dimming glass. In the electrochromic type dimming glass, the light transmittance can be changed by sandwiching the electrochromic layer between a pair of transparent electrodes and applying a DC or AC voltage to the pair of transparent electrodes. For example, Patent Document 1 discloses an electrochromic dimming glass that serves as a dimming layer. On the other hand, in the gas chromic type light control glass, the light transmittance can be changed by oxidizing or reducing the light control layer.

Electrochromic dimming glass usually requires power supply by wiring. In this case, if it is a new building, the wiring can be routed inside the wall during construction, but if the dimming glass is installed later in the existing building that has already been constructed, do you crawl the wiring on the surface of the wall? , Wall wiring work is required. For example, as shown in FIG. 18, when the dimming glass 10 is installed in an existing building, it is conceivable that the power supply line 90X connecting the outlet and the dimming glass 10 crawls on the surface of the wall. However, in this case, since the power supply line 90X is exposed indoors, the appearance is deteriorated. On the other hand, it is conceivable to embed the power supply line 90Y inside the wall so as not to make it look bad. However, in this case, since wiring work is required to temporarily peel off the wall and embed the power supply line 90Y inside the wall, the construction period becomes long and the construction cost increases.

Japanese Unexamined Patent Publication No. 2012-165632

Therefore, wireless power supply that wirelessly transmits the power to drive the dimming glass is being considered. Generally, as a wireless power feeding method, an electromagnetic induction method (magnetic field coupling method), a magnetic resonance method, an electric field coupling method, a microwave method, or the like is known.

Currently, the most practical wireless power transfer method in consideration of safety to the human body is the magnetic resonance method, but when trying to transmit power of several meters by magnetic resonance wireless power transfer, it is extremely. Practical power transmission efficiency cannot be obtained unless the conditions are very limited, such as installing large coils facing each other.

For example, as shown in FIG. 19, when power is transmitted from an indoor outlet to the light control glass 10 by magnetic resonance type wireless power supply, the power receiving coil 21X is framed so as to surround the light control glass 10. However, there is a limit to the size of the power transmission coil 31X. It is also difficult to install the power receiving coil 21X and the power transmission coil 31X facing each other. For this reason, magnetic resonance wireless power transfer has no choice but to settle for impractical power transmission efficiency unless the outlet is close to a window or other favorable conditions.

Also, if a metal body is present in the magnetic field when transmitting a large amount of electric power, an eddy current may flow through the metal body and the metal body may generate heat. For this reason, even if it is possible to transmit power of several meters by magnetic resonance wireless power transfer, it is necessary to ensure that there is no metal body between the power transmission coil and the power reception coil in consideration of safety. ..

The present disclosure has been made to solve such a problem, and the power receiving coil and the power transmitting coil for wirelessly supplying power to the dimming glass can be easily installed at a relatively short distance. An object of the present invention is to provide a wireless power transmission unit, a wireless power transmission system, and the like.

One aspect of the wireless power transmission unit according to the present disclosure is a wireless power transmission unit installed in a room having a wall, a ceiling, and a floor for driving a dimming glass, a power receiving coil, and the dimming glass. The dimming glass is mounted on the wall, and a part or all of the power transmission coil is at least behind the ceiling and under the floor. It is installed on one side.

One aspect of the wireless power transmission system according to the present disclosure is a wireless power transmission system used in a room having a wall, a ceiling, and a floor, the dimming glass attached to the wall, a power receiving coil, and the dimming. A power transmission coil for wirelessly transmitting power for driving the glass to the power receiving coil is provided, and a part or all of the power transmission coil is installed at least one of the back of the ceiling and the bottom of the floor.

One aspect of the method of installing the wireless power transmission unit according to the present disclosure is to have a wall, a ceiling, a floor, a first side wall located on one side of the wall, and a second side wall located on the other side of the wall. It is a method of installing a wireless power transmission unit in which a wireless power transmission unit is installed in a room having the power transmission unit, wherein the wireless power transmission unit receives power for driving a dimming glass, a power receiving coil, and the dimming glass. The coil is provided with a power transmission coil for wireless transmission, and the method of installing the wireless power transmission unit includes a step of attaching the dimming glass to the wall and a step of installing the power transmission coil, and the power transmission coil is installed. In the step of arranging the power transmission coil behind the ceiling, one end of the power transmission coil is routed inside the first side wall and the other end of the power transmission coil is routed inside the second side wall. , One end and the other end of the power transmission coil are electrically connected under the floor.

The power receiving coil and power transmitting coil that wirelessly supply power to the dimming glass can be installed at a relatively short distance and easily. Therefore, it is possible to wirelessly supply power to the dimming glass with a power transmission efficiency within a safe and practical range.

FIG. 1 is a cross-sectional perspective view schematically showing a configuration of a wireless power transmission unit and a wireless power transmission system according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the configuration of the wireless power transmission unit and the wireless power transmission system according to the first embodiment. FIG. 3 is a diagram showing a configuration of a power transmission device according to a modified example. FIG. 4 is a cross-sectional view of the wireless power transmission unit and the wireless power transmission system according to the first modification of the first embodiment using the power transmission device according to the modified example. FIG. 5 is a diagram showing a configuration of a power transmission coil according to the first modification. FIG. 6 is a diagram showing a state when the power transmission coil of Comparative Example 1 is routed. FIG. 7 is a diagram showing a state when the power transmission coil of the first modification shown in FIG. 5 is routed. FIG. 8 is a diagram showing a state when a plurality of power transmission coils of Comparative Example 2 are wound. FIG. 9 is a diagram showing the configuration of the power transmission coil of the modified example 2. FIG. 10 is a diagram schematically showing the configuration of the wireless power transmission unit and the wireless power transmission system according to the second modification of the first embodiment. FIG. 11 is a cross-sectional perspective view schematically showing the configuration of the wireless power transmission unit and the wireless power transmission system according to the second embodiment. FIG. 12 is a cross-sectional view schematically showing the configuration of the wireless power transmission unit and the wireless power transmission system according to the second embodiment. FIG. 13 is a diagram schematically showing the configuration of the wireless power transmission unit and the wireless power transmission system according to the second embodiment when the dimming glass is viewed from the front. FIG. 14 is a diagram for explaining a step of installing a power transmission coil (before connecting the power transmission coil) in the method of installing the wireless power transmission unit according to the second embodiment. FIG. 15 is a diagram for explaining a step of installing a power transmission coil (after connecting the power transmission coil) in the method of installing the wireless power transmission unit according to the second embodiment. FIG. 16 is a diagram schematically showing a configuration of a wireless power transmission unit and a wireless power transmission system according to the first modification. FIG. 17 is a diagram schematically showing the configuration of the wireless power transmission unit and the wireless power transmission system according to the second modification. FIG. 18 is a diagram for explaining a conventional power supply method to the dimming glass by wire. FIG. 19 is a diagram for explaining a conventional power supply method to the dimming glass by radio.

Hereinafter, embodiments of the present disclosure will be described. It should be noted that all of the embodiments described below show a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, the arrangement positions of the components, the connection form, and the like shown in the following embodiments are examples and are not intended to limit the present disclosure. Therefore, among the components in the following embodiments, the components not described in the independent claims are described as arbitrary components.

Also, each figure is a schematic diagram and is not necessarily exactly illustrated. Therefore, the scales and the like do not always match in each figure. In each figure, substantially the same configuration is designated by the same reference numerals, and duplicate description will be omitted or simplified.

(Embodiment 1)
First, the wireless power transmission unit 1 and the wireless power transmission system 2 according to the first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional perspective view schematically showing the configurations of the wireless power transmission unit 1 and the wireless power transmission system 2 according to the first embodiment. FIG. 2 is a cross-sectional view schematically showing the configuration of the wireless power transmission unit 1 and the wireless power transmission system 2 according to the first embodiment. The broken line shown in FIG. 2 indicates the magnetic flux or magnetic field generated by the power transmission coil 31.

As shown in FIGS. 1 and 2, the wireless power transmission unit 1 according to the present embodiment includes a dimming glass 10, a power receiving device 20, a power transmission device 30, and a housing 40.

The dimming glass 10, the power receiving device 20, the power transmission device 30, and the housing 40 are installed as a wireless power transmission unit 1 in a room 100 having a wall 110, a ceiling 120, and a floor 130. That is, in the wireless power transmission unit 1, the dimming glass 10, the power receiving device 20, the power transmission device 30, and the housing 40 are planned to be installed in the room 100.

Further, the dimming glass 10, the power receiving device 20, the power transmission device 30, and the housing 40 are installed in the room 100 to be configured as the wireless power transmission system 2. That is, the wireless power transmission system 2 includes a room 100, a dimming glass 10, a power receiving device 20, a power transmission device 30, and a housing 40.

Room 100 is, for example, a space in a building partitioned by a wall 110, a ceiling 120, a floor 130, and the like. The building having the room 100 is, for example, a building or a public facility, but may be a general house.

The wall 110 is made of a wall board material such as gypsum board. The wall 110 is composed of an inner wall and an outer wall. Therefore, the inside of the wall 110 is the space between the inner wall and the outer wall. A window, a door, or the like is installed on the wall 110. In the present embodiment, the wall 110 is a mounting wall to which the dimming glass 10 is mounted. A cloth or the like may be attached to the inner wall surface of the wall 110.

The ceiling 120 is made of a ceiling board material such as gypsum board. Lighting equipment, air conditioning equipment, and the like are installed on the ceiling 120. Behind the ceiling 120 (behind the ceiling), there is a space having a certain height.

The floor 130 is made of a floor board material such as floor tiles or flooring. Furniture, furniture, and the like are installed on the floor 130. Below the floor 130 (under the floor), there is a space having a certain height. When the building is a building or the like, the space under the floor 130 is an OA floor, which is a space for storing cables such as network wiring or power supply lines and storing network equipment.

The ceiling 120 and the floor 130 are continuously provided on the wall 110. Specifically, the ceiling 120 is connected to the upper end of the wall 110, and the floor 130 is connected to the lower end of the wall 110.

Further, the room 100 has a first side wall 141 located on one side of the wall 110 in addition to the wall 110, the ceiling 120 and the floor 130. Although not shown, the room 100 may further have a second side wall located on the other lateral side of the wall 110. The second side wall exists at a position facing the first side wall 141. The first side wall 141 and the second side wall are made of a wall plate material such as gypsum board. Each of the first side wall 141 and the second side wall is composed of an inner wall and an outer wall. Therefore, the inside of each of the first side wall 141 and the second side wall is the space between the inner wall and the outer wall.

The dimming glass 10 is an optical device capable of controlling the amount of transmitted light by changing the light transmittance. The dimming glass 10 is, for example, an electrochromic thin panel capable of changing the light transmittance by controlling the on / off of the applied voltage.

In the present embodiment, the light transmittance of the light control glass 10 is lowered by applying a voltage. Specifically, the dimming glass 10 has a high transmittance when no voltage is applied (when no voltage is applied) and becomes transparent, and when a voltage is applied (when a voltage is applied), the transmittance is high. Is reduced to a light-shielded state. The light-shielding state of the dimming glass 10 may be an absorption state that absorbs incident light, a scattering state that scatters and transmits the incident light, or a reflection state that reflects the incident light. It may be. The reflection in the reflection state is specular reflection, but may be scattered reflection.

The dimming glass 10 has, for example, a pair of transparent substrates, a pair of transparent electrodes provided between the pair of transparent substrates, and an electrochromic layer provided between the pair of transparent electrodes. The pair of transparent substrates are composed of, for example, a glass plate or a transparent resin substrate. One of the pair of transparent electrodes is formed on the inner surface of one of the pair of transparent substrates, and the other of the pair of transparent electrodes is formed on the inner surface of the other of the pair of transparent substrates. The pair of transparent electrodes are made of a transparent metal oxide such as ITO (Indium Tin Oxide). The electrochromic layer contains, for example, an electrolytic solution containing an electrochromic material capable of transmitting light when the metal is contained as an ion and reflecting light when the metal is contained as a metal atom. ..

By applying a first voltage (for example, 10 W) to the pair of transparent electrodes, electric charges move in the electrochromic layer, and metal ions are deposited as a metal thin film on one of the pair of transparent electrodes. Since this metal thin film has light reflectivity, the dimming glass 10 is in a reflective state when a first voltage is applied to the pair of transparent electrodes. On the other hand, by not applying the first voltage to the pair of transparent electrodes or applying a second voltage different from the first voltage to the pair of transparent electrodes, the precipitated metal thin film can be dissolved and eliminated. .. In this case, the light control glass 10 has a high light transmittance and returns to the transparent state. The metal ion in the electrochromic layer is, for example, a silver (Ag) ion. In this case, as the electrochromic material, for example, a silver compound (silver nitrate or the like) which is a salt containing silver ions can be used. The electrochromic material used for the electrochromic layer may be _{tungsten oxide (WO 3).}

The dimming glass 10 configured in this way is attached to the wall 110 of the room 100. Specifically, the dimming glass 10 is used for the window of the room 100. In this case, the dimming glass 10 is attached to the window glass of the room 100 of the existing building that has already been constructed. The dimming glass 10 may be the window itself of the room 100. In this case, the dimming glass 10 itself becomes the window glass of the wall 110.

The power receiving device 20 and the power transmitting device 30 are wireless power transmission devices that transmit electric power wirelessly. That is, wireless power is supplied by the power transmitting device 30 and the power receiving device 20.

The power receiving device 20 receives electric power for driving the dimming glass 10 from the power transmitting device 30, and supplies the received electric power to the dimming glass 10. At this time, the power receiving device 20 may perform power conversion such as stepping down or stepping up the voltage as needed. The power receiving device 20 and the dimming glass 10 are electrically connected by wiring or the like.

The power receiving device 20 has a power receiving coil 21 and a power receiving circuit 22. The power receiving coil 21 and the power receiving circuit 22 are electrically connected.

The power receiving coil 21 wirelessly receives electric power for driving the light control glass 10 from the power transmitting coil 31. The power receiving coil 21 is installed on the wall 110 of the room 100. Specifically, the power receiving coil 21 is installed on the back side of the inner wall of the wall 110 so as not to be seen from the indoor side. Further, the power receiving coil 21 is installed at a position close to the light control glass 10.

In this embodiment, two power receiving devices 20 are installed. Therefore, two power receiving coils 21 are also installed. Specifically, the power receiving coil 21 includes a first power receiving coil 21a and a second power receiving coil 21b. Similarly, two power receiving circuits 22 are installed corresponding to the first power receiving coil 21a and the second power receiving coil 21b. The power receiving circuit 22 may be one circuit common to the first power receiving coil 21a and the second power receiving coil 21b.

One of the two power receiving devices 20 is installed between the dimming glass 10 on the wall 110 and the ceiling 120, and the other of the two power receiving devices 20 is the dimming glass 10 on the wall 110 and the floor 130. It is installed between. In this case, the first power receiving coil 21a of one of the power receiving devices 20 is installed between the dimming glass 10 on the wall 110 and the ceiling 120. Further, the second power receiving coil 21b of the other power receiving device 20 is installed between the dimming glass 10 and the floor 130 on the wall 110.

The power receiving circuit 22 connected to the power receiving coil 21 receives electric power for driving the light control glass 10 from the power transmitting device 30 via the power receiving coil 21. The power receiving circuit 22 receives AC power as power for driving the light control glass 10 from the power transmission device 30 via the power receiving coil 21, for example. Further, the power receiving circuit 22 supplies AC power or DC power to the light control glass 10 in order to apply a voltage to the light control glass 10. The power receiving circuit 22 is installed on the wall 110 of the room 100 together with the power receiving coil 21. Specifically, the power receiving circuit 22 is installed on the back side of the inner wall of the wall 110. The power receiving circuit 22 is installed at a position close to the light control glass 10 like the power receiving coil 21.

In the present embodiment, the power receiving device 20 is housed in the housing 40. That is, the power receiving coil 21 and the power receiving circuit 22 are housed in the housing 40 and installed on the wall 110. Specifically, the two power receiving devices 20 are housed in one housing 40. Therefore, the first power receiving coil 21a and the second power receiving coil 21b are housed in the housing 40.

The housing 40 is a rectangular frame-shaped tubular member that surrounds the dimming glass 10. Therefore, when the dimming glass 10 is attached to the window glass, the housing 40 is arranged so as to surround the window glass. The housing 40 is, for example, a member corresponding to a window sash. The housing 40 may be configured to hold the dimming glass 10. The outer shape of the housing 40 in a plan view is not limited to a rectangular shape, and may be another shape such as a triangle, a polygon, or a circle, but is the same as the outer shape of the dimming glass 10 in a plan view. It would be nice to have one. Further, the outer shape of the housing 40 in a plan view and the outer shape of the dimming glass 10 in a plan view may be different.

Further, the light control glass 10 may include a power receiving coil 21 and a power receiving circuit 22. That is, the light control glass 10 and the power receiving device 20 may be configured as one unit. In this case, the light control glass 10 and the housing 40 in which the power receiving device 20 is housed may be configured as one unit including the housing 40. Thereby, the dimming glass 10 and the housing 40 in which the power receiving device 20 is housed can be easily installed only by installing this unit on the wall 110.

The power transmission device 30 receives electric power for driving the light control glass 10 from an external power source, and supplies the received electric power to the power receiving device 20. At this time, the power transmission device 30 may perform power conversion such as stepping down or boosting the voltage of the external power source as necessary.

The power transmission device 30 has a power transmission coil 31 (power supply coil) and a power transmission circuit 32. The power transmission coil 31 and the power transmission circuit 32 are electrically connected.

The power transmission coil 31 wirelessly transmits power for driving the dimming glass 10 to the power receiving coil 21. The power transmission coil 31 exists at a position different from that of the light control glass 10 and the power receiving device 20. That is, the power transmission coil 31 is not installed on the wall 110 to which the dimming glass 10 is attached. Specifically, a part or all of the power transmission coil 31 is installed at least one of the back of the ceiling 120 and under the floor 130. In this embodiment, all of the power transmission coils 31 are installed behind the ceiling 120 and at least one under the floor 130.

In this embodiment, two power transmission devices 30 are installed. Therefore, two power transmission coils 31 are also installed. Specifically, the power transmission coil 31 includes a first power transmission coil 31a that wirelessly transmits power to the first power reception coil 21a and a second power transmission coil 31b that wirelessly transmits power to the second power reception coil 21b. There is.

One of the two power transmission devices 30 is installed behind the ceiling 120, and the other of the two power transmission devices 30 is installed under the floor 130. In this case, the first power transmission coil 31a of one power transmission device 30 is installed behind the ceiling 120. Further, the second power transmission coil 31b of the other power transmission device 30 is installed under the floor 130.

The power transmission circuit 32 connected to the power transmission coil 31 receives electric power for driving the dimming glass 10 from an AC or DC external power source. The power transmission circuit 32 receives AC power as power for driving the light control glass 10 from, for example, a commercial AC power source which is an external power source. Further, the power transmission circuit 32 sends AC power (for example, 3 to 5 W) to the power receiving device 20 via the power transmission coil 31. In the present embodiment, power is transmitted from the power transmission coil 31 to the power reception coil 21 when no voltage is applied to the light control glass 10. The power transmission circuit 32 is installed together with the power transmission coil 31 behind the ceiling 120 or under the floor 130.

The power receiving coil 21 of the power receiving device 20 and the power transmitting coil 31 of the power transmitting device 30 are installed at positions where they are electromagnetically coupled. In the present embodiment, the distance between the power receiving coil 21 and the power transmitting coil 31 is within 1 m. Further, the distance between the power receiving coil 21 and the power transmission coil 31 is preferably half or less of the coil diameter of the power receiving coil 21 or the power transmission coil 31. By reducing the distance between the power receiving coil 21 and the power transmitting coil 31 to 1 m or less or half or less of the coil diameter, it is possible to transmit several watts of power with a power transmission efficiency (for example, 80%) within a practical range. The wireless power feeding method in the present embodiment is a magnetic resonance method.

As described above, according to the wireless power transmission unit 1 and the wireless power transmission system 2 according to the present embodiment, the power receiving coil 21 is installed on the wall 110 to which the light control glass 10 is attached. Specifically, two power receiving coils 21 of the first power receiving coil 21a and the second power receiving coil 21b are used, and the first power receiving coil 21a is located between the dimming glass 10 on the wall 110 and the ceiling 120. The second power receiving coil 21b is installed between the dimming glass 10 and the floor 130 on the wall 110.

On the other hand, the power transmission coil 31 is installed at least one of the back of the ceiling 120 and under the floor 130. Specifically, the first power transmission coil 31a corresponding to the first power receiving coil 21a is installed behind the ceiling 120, and the second power transmission coil 31b corresponding to the second power receiving coil 21b is installed under the floor 130. To.

In this way, the power receiving coil 21 is installed on the wall 110 to which the light control glass 10 is attached, and the power transmitting coil 31 is installed behind the ceiling 120 continuous with the wall 110 or under the floor 130, so that the power receiving coil 21 can be installed. The power transmission coil 31 can be installed at a location close to the dimming glass 10 that serves as the installed window.

In this way, since the power transmission device 30 (power transmission coil 31) can be installed using the space behind the ceiling 120 and under the floor 130, the power transmission coil 31 can be installed without peeling off the wall. Therefore, even when the dimming glass 10 is retrofitted to an existing building, the power transmission coil 31 can be easily installed without requiring long-term and high-cost construction.

Moreover, by installing the power transmission coil 31 behind the ceiling 120 or under the floor 130 continuous with the wall 110 on which the power reception coil 21 is installed, the power reception coil 21 and the power transmission coil 31 are installed at relatively short distances. can do. For example, the power receiving coil 21 and the power transmitting coil 31 can be brought close to each other by several tens of centimeters. At least the power receiving coil 21 and the power transmitting coil 31 can be brought close to each other within 1 m. Therefore, it is possible to easily avoid the presence of a metal object between the power receiving coil 21 and the power transmitting coil 31 and heat generation, so that the wireless power transmission unit 1 and the wireless power transmission system 2 having excellent safety can be realized. it can. Further, by installing the power receiving coil 21 and the power transmitting coil 31 at relatively short distances, it is possible to easily realize a power transmission efficiency (for example, 80%) in a practical range.

Further, by installing the power receiving coil 21 on the wall 110 and the power transmitting coil 31 behind the ceiling 120 or under the floor 130, the power receiving coil 21, the power transmission coil 31, wiring and the like cannot be seen from inside the room 100. Can be installed. As a result, it is possible to prevent the power receiving coil 21, the power transmitting coil 31, the wiring, and the like from being exposed and spoiling the aesthetic appearance in the room 100.

From the viewpoint of easily installing the transmission coil 31, the existing building in which the dimming glass 10 is installed may be an office building or a public facility having an OA floor under the floor 130 of the room 100. Since the raised floor can be easily installed, the building may not have an raised floor. For example, by installing an OA floor, the power transmission coil 31 can be easily installed under the floor 130 (OA floor).

Further, as shown in FIG. 3, the power transmission device 30A may have a hinge structure 33 that connects the power transmission coil 31 and the power transmission circuit 32. The hinge structure 33 is, for example, a hinge metal fitting. By connecting the power transmission coil 31 and the power transmission circuit 32 by the hinge structure 33, the power transmission device 30A can be bent or unfolded around the hinge structure 33. For example, the bending angle θ formed by the coil surface of the power transmission coil 31 and the substrate surface of the power transmission circuit 32 can be changed within the range of 0 ° <θ <360 °.

As a result, the posture or form of the power transmission device 30A installed behind the ceiling 120 and under the floor 130 can be adjusted according to the size of the space area behind the ceiling 120 and under the floor 130. By adjusting the form or posture of the power transmission device 30A in this way, the direction of the power transmission coil 31 can be changed according to the situation of the space area behind the ceiling 120 and under the floor 130.

For example, the space under the floor 130 is generally narrow, and there is often no room for height. Specifically, in the case of an OA floor, the height of the space under the floor 130 is 50 mm or less. On the other hand, behind the ceiling 120, a space having a height of 50 cm or more is secured so that a normal worker can work, and there is often a margin in height. Therefore, if there is no room in the height, the power transmission device 30A is installed in a state close to flat (for example, 175 ° ≤ θ ≤ 180 °) without bending the power transmission device 30A. In this case, the thickness (height) of the power transmission device 30A is, for example, 1 to 2 cm. On the other hand, if there is a margin in height, the power transmission device 30A may be installed with the power transmission device 30A bent (for example, 90 ° ≦ θ ≦ 175 °).

Specifically, as shown in FIG. 4, when there is a margin in the height of the space behind the ceiling 120 and there is no margin in the height of the space under the floor 130, there is a margin in the height. The power transmission device 30A installed behind a certain ceiling 120 is installed by bending, and the power transmission device 30A installed under the floor 130, which has no room for height, is installed in a state close to flat without bending. be able to.

As described above, if there is a margin in the height of the space behind the ceiling 120 or under the floor 130, the power transmission device 30A can be bent to change the direction of the power transmission coil 31. In this case, the direction of the power transmission coil 31 may be changed so that the coil surface of the power transmission coil 31 faces the coil surface of the power reception coil 21. As a result, the power transmission efficiency between the power transmission coil 31 and the power reception coil 21 can be improved. That is, the orientation of the power transmission coil 31 may be adjusted so that the power transmission efficiency between the power transmission coil 31 and the power reception coil 21 approaches the maximum. The orientation of the power transmission coil 31 can be adjusted by an operator, for example, when the power transmission coil 31 is installed.

In addition, there may be obstacles such as electrical equipment or building structures behind the ceiling 120 and under the floor 130. In this case, it is not always possible to install the power transmission coil 31 in a desired form. Therefore, as shown in FIG. 5, the transmission coil 31 is attached to the flexible coil wire 311, the first connector 312 mechanically and electrically connected to one end of the coil wire 311 and the other end of the coil wire 311. It has a second connector 313 that is mechanically and electrically connected, and the first connector 312 and the second connector 313 can be detachably connected to each other. As an example, the first connector 312 is a female connector, the second connector 313 is a male connector, and by inserting the second connector 313 into the first connector 312, the first connector 312 and the second connector 313 are mechanically inserted. And can be electrically connected.

As a result, as shown in FIG. 6, in the power transmission coil 31Y of the comparative example in which the coil wire cannot be bent and the coil shape is constant, the power transmission coil 31Y and the obstacle 200 may overlap and interfere with each other. By using the power transmission coil 31 having the flexible coil wire 311 shown in 5, as shown in FIG. 7, the coil wire 311 can be routed while avoiding the obstacle 200. Further, the power transmission coil 31 can be easily installed by connecting the first connector 312 and the second connector 313 connected to both ends of the coil wire 311.

For the power transmission coil 31 shown in FIG. 5, it is preferable to prepare a lineup of a plurality of types having different lengths of the coil wires 311. As a result, the degree of freedom in routing the power transmission coil 31 is increased, so that even when a plurality of obstacles 200 are scattered behind the ceiling 120 and under the floor 130, the power transmission coil 31 avoids the plurality of obstacles 200. Can be easily routed.

Also, when a power transmission coil is configured with a cable, if the coil wire is a normal single wire, it will only be a one-turn power transmission coil. On the other hand, in order to earn the L value of the coil, as shown in FIG. 8, it is necessary to prepare a long power transmission coil 31Z and wind the power transmission coil 31Z many times at the installation site, and it takes time to install the power transmission coil 31Z. Is not practical because it becomes long or the predetermined L value cannot be obtained after all.

Therefore, it is preferable to use the power transmission coil 31A having the configuration shown in FIG. The transmission coil 31A shown in FIG. 9 includes a plurality of coil wires 311 and a first connector 312 mechanically and electrically connected to one end of each of the plurality of coil wires 311 and each of the plurality of coil wires 311. It has a second connector 313 that is mechanically and electrically connected to the other end of the coil wire, and by connecting the first connector 312 and the second connector 313, a plurality of coil wires 311 are wound in a plurality of windings. It becomes one winding coil. Further, the power transmission coil 31A has an insulating tube 314 for accommodating a plurality of bundled coil wires 311. In the power transmission coil 31A having such a configuration, the power transmission coil 31A composed of a plurality of winding winding coils can be obtained only by connecting the first connector 312 and the second connector 313.

By using the power transmission coil 31A having the configuration shown in FIG. 9, after the insulating tube 314 containing a plurality of coil wires 311 is routed at the installation site of the power transmission coil 31A, the first connector 312 and the second connector 313 are used. A power transmission coil 31A composed of a plurality of winding (plural turns) winding coils can be installed simply by connecting the two. Thereby, the power transmission coil 31A having a high L value of a plurality of turns can be easily installed.

Further, in the present embodiment, the light control glass 10 is an optical device whose light transmittance is lowered by applying a voltage. As an example, the dimming glass 10 is an electrochromic thin panel that is in a light-shielded state when a voltage is applied. In this case, when driving the light control glass 10 to reduce the light transmittance of the light control glass 10, for example, it is necessary to apply a voltage of about 10 W to the light control glass 10. On the other hand, it is assumed that the electric power transmitted from the power transmitting device 30 (transmission coil 31) to the power receiving device 20 (power receiving coil 21) is often smaller (about several watts) than the electric power for driving the dimming glass 10. .. Therefore, it is preferable to transmit electric power from the power transmitting coil 31 to the power receiving coil 21 when no voltage is applied to the light control glass 10.

Further, since the electrochromic type dimming glass 10 consumes a large amount of power only when the light transmittance is changed, the hurdle is high when trying to transmit the peak power. For example, if the electric power transmitted from the transmitting coil 31 to the receiving coil 21 is smaller than the electric power for driving the dimming glass 10, even if the light transmittance of the dimming glass 10 is changed, the instantaneous electric power is insufficient and the light is transmitted. It may not be possible to change the rate. Therefore, as shown in FIG. 10, it is preferable that the wireless power transmission unit 1A and the wireless power transmission system 2A include a storage battery 50 (secondary battery) for storing the electric power received by the power receiving coil 21. The storage battery 50 can be installed inside the wall 110 to which the dimming glass 10 is attached, for example. A plurality of the dimming glass 10 and the storage battery 50 may be installed. The storage battery 50 is housed in, for example, a housing 40.

By installing the storage battery 50 in this way, even if the power transmitted from the power transmission coil 31 to the power receiving coil 21 is small, the power can be stored in the storage battery 50 at any time when necessary. A voltage can be applied to the dimming glass 10 with. Further, at night, the dimming glass 10 may be kept in a transparent state without applying a voltage to the dimming glass 10. Therefore, it is preferable to charge the storage battery 50 by transmitting electric power from the power transmitting coil 31 to the power receiving coil 21 by using low-cost nighttime electric power at night when the voltage is not applied to the light control glass 10.

In the present embodiment, the power receiving device 20 is installed on both the upper and lower sides of the light control glass 10, but the present invention is not limited to this. For example, the power receiving device 20 may be installed only on either the upper or lower side of the light control glass 10. That is, the power receiving coil 21 may be installed only on either the upper or lower side of the light control glass 10. Further, the power receiving coil 21 may be installed on the left and right sides of the light control glass 10 as long as the power can be supplied to and from the power transmission coil 31. That is, the power receiving coil 21 may be installed at at least one place on the top, bottom, left, and right of the light control glass 10. In this case, the number and position of the power transmission coils 31 may be one or more according to the number and positions of the power receiving coils 21.

(Embodiment 2)
Next, the wireless power transmission unit 1B and the wireless power transmission system 2B according to the second embodiment will be described with reference to FIGS. 11, 12, and 13. FIG. 11 is a cross-sectional perspective view schematically showing the configurations of the wireless power transmission unit 1B and the wireless power transmission system 2B according to the second embodiment. FIG. 12 is a cross-sectional view schematically showing the configuration of the wireless power transmission unit 1B and the wireless power transmission system 2B according to the second embodiment. FIG. 13 is a diagram schematically showing the configurations of the wireless power transmission unit 1B and the wireless power transmission system 2B according to the second embodiment when the dimming glass 10 is viewed from the front. The broken line shown in FIG. 12 indicates the magnetic flux or magnetic field generated by the power transmission coil 31B.

As shown in FIGS. 11 to 13, the wireless power transmission unit 1B and the wireless power transmission system 2B in the present embodiment are the wireless power transmission unit 1 and the wireless power transmission in the above embodiment shown in FIGS. 1 and 2. The configuration of the power transmission device 30B is different from that of the system 2. Specifically, the configuration of the power transmission coil 31B of the power transmission device 30B is different.

Specifically, the power transmission coil 31 according to the first embodiment is entirely installed behind the ceiling 120 or under the floor 130, but the power transmission coil 31B according to the present embodiment is partially installed on the ceiling. It is installed behind the 120 and under the floor 130. More specifically, as shown in FIGS. 11 to 13, the power transmission coil 31B is installed behind the ceiling 120, inside the first side wall 141, under the floor 130, and inside the second side wall 142. .. That is, the power transmission coil 31B is formed in a rectangular frame shape so as to surround the indoor space of the room 100.

The first side wall 141 and the second side wall 142 are a pair of side walls facing each other. The first side wall 141 is located on one side of the wall 110 to which the dimming glass 10 is attached, and the second side wall 142 is located on the other side of the wall 110.

Further, in the present embodiment, there is only one power transmission coil 31B. On the other hand, there are two power receiving coils 21 as in the first embodiment. Therefore, in the present embodiment, one power transmitting coil 31B corresponds to two power receiving coils 21. That is, power is supplied to the two power receiving coils 21 at the same time by one power transmitting coil 31B.

Further, also in this embodiment, the power receiving coil 21 and the power transmitting coil 31B can be brought close to each other within 1 m. Specifically, the power receiving coil 21 and the power transmitting coil 31B can be brought close to each other by several tens of centimeters.

In the present embodiment, the configurations other than the power transmission coil 31B are the same as those in the first embodiment.

As described above, according to the wireless power transmission unit 1B and the wireless power transmission system 2B in the present embodiment, the power transmission coil 31B is used in the space behind the ceiling 120 and under the floor 130 as in the first embodiment. It is installed. As a result, the same effect as that of the first embodiment can be obtained in the present embodiment as well. That is, the power receiving coil 21 and the power transmitting coil 31B that wirelessly supply power to the light control glass 10 can be easily installed at a relatively short distance. Therefore, it is possible to wirelessly supply power to the dimming glass 10 with a power transmission efficiency within a safe and practical range.

Further, in the present embodiment, the power transmission coil 31B is installed behind the ceiling 120, inside the first side wall 141, under the floor 130, and inside the second side wall 142. As a result, the coil diameter of the power transmission coil 31B can be made larger than the coil diameter of the power transmission coil 31 in the first embodiment.

Next, the installation method of the wireless power transmission unit 1B in the present embodiment will be described with reference to FIGS. 14 and 15. 14 and 15 are diagrams for explaining a process of installing the power transmission coil 31B in the method of installing the wireless power transmission unit 1B according to the second embodiment. FIG. 14 shows a state when the power transmission coil 31B is arranged behind the ceiling 120 before connecting both ends of the power transmission coil 31B, and FIG. 15 shows a state of the power transmission coil 31B after connecting both ends. It is a figure.

The method of installing the wireless power transmission unit 1B in the present embodiment includes a step of attaching the dimming glass 10 to the wall 110, a step of installing the power receiving device 20 (power receiving coil 21) on the wall 110, and a power transmission device 30B (power transmission coil). 31B) includes the step of installing.

Then, in the process of installing the power transmission coil 31B, the worker first holds the power transmission coil 31B and goes up to the back of the ceiling 120, and arranges the power transmission coil 31B behind the ceiling 120 as shown in FIG. After that, the power transmission coil 31B is hung from the gap between the first side wall 141 and the second side wall 142, one end of the power transmission coil 31B is routed inside the first side wall 141, and the other end of the power transmission coil 31B is inside the second side wall 142. Route to. Then, both ends of the power transmission coil 31B are pulled under the floor 130 to electrically connect one end and the other end of the power transmission coil 31B under the floor 130, as shown in FIG.

At this time, it is preferable to use the power transmission coil 31B having the same structure as the power transmission coil 31 shown in FIG. Specifically, the power transmission coil 31B has a flexible coil wire 311 and a first connector 312 mechanically and electrically connected to one end of the coil wire 311 and mechanically and electrically to the other end of the coil wire 311. It has a second connector 313 connected to the object. Further, the first connector 312 and the second connector 313 can be detachably connected to each other.

As a result, after the power transmission coil 31B is routed under the floor 130 from the back of the ceiling 120 through the inside of the first side wall 141 and the second side wall 142, both ends of the power transmission coil 31B are mechanically and electrically operated under the floor 130. Can be easily connected. Therefore, even if the power transmission coil 31B has a large coil diameter, the power transmission coil 31B can be easily installed. Although not shown, the power transmission coil 31B is connected to the power transmission circuit 32 when or after connecting both ends of the power transmission coil 31B.

(Modification example)
The wireless power transmission unit, the wireless power transmission system, and the like according to the present disclosure have been described above based on the first and second embodiments, but the present disclosure is not limited to the first and second embodiments.

For example, as in the wireless power transmission unit 1C and the wireless power transmission system 2C shown in FIG. 16, the dimming glass 10 may be configured to slide. Specifically, in this modification, the housing 40 is used as the inner frame, and the outer frame 60 is further installed on the wall 110. The outer frame 60 has a rail that holds the housing 40 so that the housing 40 can move within the outer frame 60. As a result, the light control glass 10 can slide in the outer frame 60 together with the housing 40 in which the power receiving coil 21 is housed.

Further, in the above-described first and second embodiments, the power receiving coil 21 and the power receiving circuit 22 are housed in the housing 40, but the present invention is not limited to this. For example, as shown in FIG. 17, the power receiving coil 21 and the power receiving circuit 22 may be installed inside the wall 110 to which the light control glass 10 is attached.

Further, in the above-described first and second embodiments, the wireless power feeding method using the power receiving coil 21 and the power transmitting coil 31 is a magnetic resonance method, but the method is not limited to this. For example, the wireless power feeding method using the power receiving coil 21 and the power transmitting coil 31 may be an electromagnetic induction method.

Further, in the above-described first and second embodiments, the power receiving device 20 (power receiving coil 21) is arranged at a position above or below the light control glass 10, but the present invention is not limited to this. For example, the power receiving device 20 (power receiving coil 21) may be installed so as to surround the light control glass 10 when the wall 110 is viewed in a plane (that is, when the light control glass 10 is viewed in front). In this case, when a plurality of dimming glasses 10 are installed side by side, the power receiving coil 21 may be installed so as to surround the plurality of dimming glasses 10, or among the plurality of dimming glasses 10. It may be installed so as to surround one.

Further, in the above-described first and second embodiments, the case where the light control glass 10, the power receiving device 20 and the power transmitting device 30 are installed in the room 100 of the existing building that has already been constructed has been described, but the present invention is not limited to this. For example, the dimming glass 10, the power receiving device 20, and the power transmitting device 30 may be installed in the building to be constructed.

In addition, a form obtained by applying various modifications to the above-described embodiments and modifications that can be conceived by those skilled in the art, or components and functions in each of the above-described embodiments and modifications without departing from the spirit of the present disclosure. Also included in the present disclosure are forms realized by any combination of the above.

1, 1A, 1B wireless power transmission unit 2, 2A, 2B wireless power transmission system 10 dimming glass 20 power receiving device 21 power receiving coil 21a first power receiving coil 21b second power receiving coil 22 power receiving circuit 30, 30A, 30B power transmitting device 31, 31A, 31B Transmission coil 31a 1st transmission coil 31b 2nd transmission coil 32 Transmission circuit 33 Hinge structure 40 Housing 50 Storage battery 60 Outer frame 100 Room 110 Wall 120 Ceiling 130 Floor 141 1st side wall 142 2nd side wall 200 Obstacle 311 coil Wire 312 1st connector 313 2nd connector 314 Insulated tube

Claims (16)

1. A wireless power transmission unit installed in a room with walls, ceilings and floors.
   Dimmable glass and
   With the power receiving coil
   It is provided with a power transmission coil that wirelessly transmits power for driving the light control glass to the power receiving coil.
   The dimming glass is mounted on the wall and
   Part or all of the power transmission coil is installed behind the ceiling and at least one under the floor.
   Wireless power transmission unit.
2. The distance between the power receiving coil and the power transmission coil is within 1 m.
   The wireless power transmission unit according to claim 1.
3. The dimming glass is an electrochromic optical device.
   The wireless power transmission unit according to claim 1 or 2.
4. The light transmittance of the dimming glass decreases when a voltage is applied.
   When no voltage is applied to the light control glass, power is transmitted from the power transmission coil to the power receiving coil.
   The wireless power transmission unit according to any one of claims 1 to 3.
5. The power receiving coil includes a first power receiving coil and a second power receiving coil.
   The first power receiving coil is installed between the dimming glass and the ceiling on the wall.
   The second power receiving coil is installed between the dimming glass and the floor on the wall.
   The wireless power transmission unit according to any one of claims 1 to 4.
6. The power receiving coil is installed so as to surround the dimming glass when the wall is viewed in a plan view.
   The wireless power transmission unit according to any one of claims 1 to 4.
7. The power transmission coil includes a first power transmission coil that wirelessly transmits power to the first power receiving coil and a second power transmission coil that wirelessly transmits power to the second power receiving coil.
   The first power transmission coil is installed behind the ceiling.
   The first power receiving coil is installed under the floor.
   The wireless power transmission unit according to claim 5 or 6.
8. A power transmission circuit connected to the power transmission coil is provided.
   The power transmission coil and the power transmission circuit are connected by a hinge structure.
   The wireless power transmission unit according to claim 7.
9. The room further has a first side wall located on one side of the wall and a second side wall located on the other side of the wall.
   The power transmission coil is installed behind the ceiling, inside the first side wall, under the floor, and inside the second side wall.
   The wireless power transmission unit according to claim 5 or 6.
10. The power transmission coil has a flexible coil wire, a first connector mechanically and electrically connected to one end of the coil wire, and a second connector mechanically and electrically connected to the other end of the coil wire. Has a connector and
    The first connector and the second connector are detachably connected to each other.
    The wireless power transmission unit according to any one of claims 1 to 9.
11. The coil wire is plural,
    One end of each of the plurality of coil wires is connected to the first connector.
    The other end of each of the plurality of coil wires is connected to the second connector.
    By connecting the first connector and the second connector, a plurality of the coil wires become one winding coil having a plurality of turns.
    The wireless power transmission unit according to claim 10.
12. A housing for accommodating the power receiving coil is provided.
    The wireless power transmission unit according to any one of claims 1 to 11.
13. The power receiving coil is installed inside the wall to which the dimming glass is attached.
    The wireless power transmission unit according to any one of claims 1 to 11.
14. A storage battery for storing the electric power received by the power receiving coil is provided.
    The wireless power transmission unit according to any one of claims 1 to 13.
15. A wireless power transfer system used in rooms with walls, ceilings and floors.
    The dimming glass attached to the wall and
    With the power receiving coil
    It is provided with a power transmission coil that wirelessly transmits power for driving the light control glass to the power receiving coil.
    A part or all of the power transmission coil is installed at least one of the back of the ceiling and the bottom of the floor.
    Wireless power transmission system.
16. Installation of a wireless power transmission unit for installing a wireless power transmission unit in a room having a wall, a ceiling, a floor, a first side wall located on one side of the wall, and a second side wall located on the other side of the wall. It ’s a method,
    The wireless power transmission unit is
    Dimmable glass and
    With the power receiving coil
    It is provided with a power transmission coil that wirelessly transmits power for driving the light control glass to the power receiving coil.
    The method of installing the wireless power transmission unit is as follows.
    The process of attaching the dimming glass to the wall and
    Including the process of installing the power transmission coil
    In the process of installing the power transmission coil,
    The power transmission coil is placed behind the ceiling, one end of the power transmission coil is routed inside the first side wall, the other end of the power transmission coil is routed inside the second side wall, and then the floor. Below, one end and the other end of the power transmission coil are electrically connected.
    How to install the wireless power transmission unit.

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