WO2013065277A1 - Wireless power supply device and coil usage method - Google Patents

Wireless power supply device and coil usage method Download PDF

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Publication number
WO2013065277A1
WO2013065277A1 PCT/JP2012/006900 JP2012006900W WO2013065277A1 WO 2013065277 A1 WO2013065277 A1 WO 2013065277A1 JP 2012006900 W JP2012006900 W JP 2012006900W WO 2013065277 A1 WO2013065277 A1 WO 2013065277A1
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WIPO (PCT)
Prior art keywords
coil
array layer
coils
power
wireless power
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Application number
PCT/JP2012/006900
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French (fr)
Japanese (ja)
Inventor
塚越　常雄
小林　直樹
ヒョングン イム
真 高宮
貴康 桜井
Original Assignee
日本電気株式会社
国立大学法人 東京大学
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Application filed by 日本電気株式会社, 国立大学法人 東京大学 filed Critical 日本電気株式会社
Publication of WO2013065277A1 publication Critical patent/WO2013065277A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment

Definitions

  • the present invention relates to a wireless power feeding device (wireless power feeding device) that supplies power to a power receiving coil using a magnetic field resonance method and a method of using a coil included in the wireless power feeding device.
  • a technique related to magnetic field resonance type wireless power feeding (wireless power feeding), which is a power feeding method using magnetic field coupling between coils that resonate (resonate) at the same frequency, is disclosed (for example, Patent Document 1).
  • Many peripheral technologies related to magnetic field resonance type wireless power feeding have been developed.
  • the magnetic resonance type wireless power feeding has a feature that power can be fed with high efficiency even in a region where the distance between the transmitting and receiving coils is long as compared with the electromagnetic induction type wireless power feeding.
  • the magnetic field resonance type wireless power feeding has an advantage that the power feeding efficiency does not vary greatly even if the positional relationship between the coils slightly varies.
  • a resonance coil (hereinafter referred to as a repeater coil or a power relay coil) in which both ends of the coil are short-circuited on a concentric circle as shown in FIG.
  • An arrangement method is disclosed (Patent Document 2).
  • coils having the same resonance frequency are arranged on the same plane, one of them is used as a power transmission coil, and the other coil is short-circuited, that is, neither the power transmission circuit nor the power reception circuit is connected. Is used as a short-circuited repeater coil.
  • Non-Patent Document 2 a wireless power feeding apparatus in which repeater coils are arranged vertically and horizontally in a plane to realize a power feeding area having a two-dimensional spread.
  • Patent Document 3 discloses a non-contact power transmission device that realizes stable power transmission in a wider range by reducing the point where transmission is impossible.
  • a soft magnetic material is arranged on the back surface of a plurality of superimposed primary coils so as to improve output by improving magnetic coupling, and a power source is connected to each of the primary coils, and adjacent primary coils are connected.
  • the transmission efficiency is improved by flowing current with a specific phase difference.
  • Non-Patent Document 2 that further expands the power supply area using a repeater coil in magnetic resonance wireless power supply that is relatively resistant to positional deviation has a great advantage over other wireless power supply apparatuses. Have.
  • Non-Patent Document 2 in a position (position B) where the power transmission coil and the repeater coil are in contact with each other and a region surrounded by three repeater coils adjacent to the power transmission coil (position C) shown in FIG. As compared with the position (position A) immediately above the power transmission coil, there has been a problem that received power is greatly reduced.
  • the power transmission device of Patent Document 3 also has an effect of reducing the point where transmission is impossible in the plane direction, but uses electromagnetic induction power feeding, and the power feeding efficiency is drastically in a region where the distance between the transmitting and receiving coils is long. It has a big problem in that the position of the power receiving coil that is lowered and can be fed is limited.
  • an object of the present invention is to provide a magnetic resonance type wireless power feeding apparatus that maintains high power transmission / reception efficiency with respect to positional deviation between a power transmission coil and a power reception coil.
  • the wireless power supply apparatus of the present invention is a wireless power supply apparatus that supplies power to a power receiving coil using a magnetic field resonance method, and includes a first coil array layer including at least one power transmission coil connected to an oscillation circuit, and the power transmission And a second coil array layer including at least one power relay coil arranged across the coil.
  • the coil usage method of the present invention is a coil usage method in a wireless power feeder that supplies power to a power receiving coil using a magnetic field resonance method, and is a first in which a plurality of coils are periodically arranged in a two-dimensional manner.
  • a second coil array layer in which at least one coil is connected to an oscillation circuit to form a power transmission coil, and a plurality of coils are periodically arranged in a two-dimensional manner in a state of being stacked on the first coil array layer. In this case, both ends of the coil arranged in a state straddling the power transmission coil are short-circuited to form a power relay coil.
  • a magnetic resonance type wireless power feeding apparatus that maintains high power transmission / reception efficiency with respect to a positional deviation between a power transmission coil and a power reception coil.
  • FIG. 1 is a perspective view of a wireless power feeding apparatus 100 according to Embodiment 1.
  • FIG. 1 is a diagram showing a front view of a wireless power feeding apparatus 100 according to Embodiment 1.
  • FIG. 1 is a diagram showing a front view of a wireless power feeding apparatus 100 according to Embodiment 1.
  • FIG. 1 is a plan view of a wireless power supply apparatus 100 according to Embodiment 1.
  • FIG. 2 is a diagram illustrating a perspective view of a wireless power feeding apparatus 200 according to Embodiment 1.
  • FIG. 3 is a diagram illustrating a front view of a wireless power feeding apparatus 200 according to Embodiment 1.
  • FIG. 3 is a diagram illustrating a plan view of a wireless power feeding apparatus 200 according to Embodiment 1.
  • FIG. 3 is a diagram showing a first coil array layer of the wireless power feeding apparatus 300 according to Embodiment 1.
  • FIG. 3 is a diagram showing a second coil array layer of the wireless power feeding apparatus 300 according to Embodiment 1.
  • FIG. 3 is a diagram illustrating a front view of a wireless power feeding apparatus 300 according to Embodiment 1.
  • FIG. 1 is a plan view of a wireless power supply apparatus 100 according to Embodiment 1.
  • FIG. 2 is a diagram illustrating a perspective view of a wireless power feeding apparatus 200 according to Em
  • FIG. 3 is a diagram illustrating a plan view of a wireless power feeding apparatus 300 according to Embodiment 1.
  • FIG. 4 is a graph showing transmission efficiency around a power transmission coil in the wireless power feeder 300.
  • 6 is a diagram showing a first coil array layer of another form of wireless power supply apparatus 400 according to Embodiment 1.
  • FIG. 6 is a diagram showing a second coil array layer of wireless power supply apparatus 400 according to Embodiment 1.
  • FIG. 3 is a diagram showing a front view of wireless power supply apparatus 400 according to Embodiment 1.
  • FIG. 6 is a plan view of another embodiment of wireless power supply apparatus 400 according to Embodiment 1.
  • FIG. 6 is a diagram showing a first coil array layer of a wireless power feeding device of a modification according to Embodiment 1.
  • FIG. 6 is a diagram showing a second coil array layer of the wireless power feeding apparatus according to the modification according to the first embodiment.
  • FIG. 6 is a diagram showing a front view of a wireless power feeding device of a wireless power feeding device of a modification according to the first embodiment.
  • FIG. 10 is a diagram illustrating a plan view of a wireless power feeding device according to a modification example of the first embodiment.
  • 3 is a diagram illustrating a configuration of a wireless power feeding device according to another embodiment according to Embodiment 1.
  • FIG. 3 is a diagram illustrating a configuration of a wireless power feeding device according to another embodiment according to Embodiment 1.
  • FIG. 6 is a diagram showing a tile-shaped coil unit according to Embodiment 2.
  • FIG. 6 is a diagram showing a coil array layer that constitutes a wireless power feeding apparatus 500 according to Embodiment 2.
  • FIG. 6 is a diagram showing a second coil array layer included in a wireless power feeding apparatus 500 according to Embodiment 2.
  • FIG. 6 is a diagram illustrating a third coil array layer included in a wireless power feeding apparatus 500 according to Embodiment 2.
  • FIG. 6 is a diagram showing a fourth coil array layer included in wireless power feeding apparatus 500 according to Embodiment 2.
  • FIG. 6 is a diagram illustrating a front view of a wireless power feeding apparatus 500 according to Embodiment 2.
  • FIG. 6 is a left side view of a wireless power feeding apparatus 500 according to Embodiment 2.
  • 6 is a plan view of a wireless power feeding apparatus 500 according to Embodiment 2.
  • FIG. It is a figure explaining the structure of the radio
  • FIG. 1 is a block diagram showing a configuration of a coil unit 10 that is a main component of a wireless power feeding apparatus 100 using a magnetic field resonance method according to Embodiment 1 of the present invention.
  • the coil unit 10 includes a coil 11 and a function switching unit 12.
  • the coil 11 becomes a coil having a function of a power transmission coil, a repeater coil, or an open coil by function switching by the function switching unit 12.
  • the repeater coil is a coil that relays the power supplied from the power transmission coil in order to extend the power reception distance
  • the repeater coil may be referred to as a power relay coil in the following description.
  • the coil 11 can be formed by a printed circuit board technology.
  • a capacitor is connected in series with an octagonal coil pattern having a diameter of 40 mm and wound by 9 turns to have an inductance of 3.42 ⁇ H, and the total capacitance combined with the stray capacitance of the coil is 39 pF. Things can be used.
  • the function switching unit 12 selects the function of the coil 11 from any one of a power transmission coil, a repeater coil, and an open coil.
  • the function switching unit 12 includes a function switching circuit including an oscillation circuit 13 and a switch 14.
  • the oscillation circuit 13 is a circuit that outputs an AC signal having a constant frequency, and can be realized by a relatively simple circuit such as a clap type.
  • the clap type oscillation circuit includes a transistor, a capacitor, and an inductor.
  • the switch 14 is a switch for switching the function of the coil 11.
  • the switch 14 connects both ends of the coil 11 to the oscillation circuit 13 (the highest level in the figure).
  • the switch 14 connects both terminals of the coil 11 to the short-circuited position (the lowest level in the figure).
  • the switch 14 opens the coil 11 so that nothing is connected (center position in the figure).
  • FIG. 2A to 2D show equivalent circuits and abbreviated symbols for each coil.
  • FIG. 2A is a diagram illustrating an equivalent circuit and abbreviated symbols of the power transmission coil.
  • FIG. 2B is a diagram showing an equivalent circuit and abbreviated symbols of the power receiving coil.
  • FIG. 2C is a diagram showing an equivalent circuit and abbreviated symbols of the repeater coil.
  • FIG. 2D is a diagram showing an equivalent circuit and abbreviated symbols of the open coil. Note that the power receiving coil shown in FIG. 2B is used with a load connected to the same coil as the others.
  • a rectifier circuit and a regulator that convert electric power received as a load into DC are arranged at the tip of the load of the power receiving coil, and the electric power obtained through these is used as a power source on the power receiving side.
  • each coil having each function will be described using the abbreviations shown in FIG.
  • FIG. 3 is a diagram illustrating a configuration of the wireless power supply apparatus 100 according to the first embodiment.
  • 3A to 3C respectively show a perspective view, a front view, and a plan view of the wireless power feeding apparatus 100.
  • the magnetic field resonance power transmission coil is shown as “sending”, the repeater coil as “re”, and the power receiving coil as “receiving”.
  • the wireless power supply apparatus 100 includes two coil units 10. A coil 11 included in one coil unit 10 is set as a power transmission coil 110, and a coil 11 included in the other coil unit 10 is set as a repeater coil 120. In the following drawings, only the coil 11 is shown for convenience, and the function switching unit 12 is omitted.
  • the wireless power feeding apparatus 100 includes two coil layers, a first layer having a power transmission coil 110 connected to an oscillation circuit and a second layer having a power relay coil 120, which are stacked in parallel. Configured. Further, as can be seen from FIG. 3C, the power relay coil 120 included in the second layer is arranged so as to overlap a part of the power transmission coil 110 included in the first layer.
  • the repeater coil 120 straddles the power transmission coil 110, the magnetic flux density near the overlap of the power transmission coil 110 and the repeater coil 120 is improved, and even when the power reception coil is disposed immediately above the overlap, the received power Can be avoided.
  • FIG. 4 is a diagram illustrating a configuration of the wireless power feeding apparatus 200 when four repeater coils are arranged so as to straddle the power transmission coil.
  • 4A is a perspective view of the wireless power supply apparatus 200
  • FIG. 4B is a front view of the wireless power supply apparatus 200
  • FIG. 4C is a plan view of the wireless power supply apparatus 200.
  • the wireless power feeding apparatus 200 includes two coils, a first layer having a power transmission coil 110 connected to an oscillation circuit and a second layer having four power relay coils 120. Layers are stacked.
  • the four power relay coils 120 included in the second layer are arranged so as to overlap with a part of the power transmission coil 110 included in the first layer.
  • the sensitivity reduction region around the power transmission coil 110 can be further reduced by configuring the four repeater coils 120 to cross the power transmission coil 110 evenly.
  • FIG. 5 shows a configuration of a wireless power supply apparatus 300 that covers a power supply area two-dimensionally based on the coil arrangement in the wireless power supply apparatus shown in FIGS.
  • the wireless power supply apparatus 300 of the magnetic field resonance type has a first layer (first coil array layer) in which a plurality of coils 11 are arranged in an array and a plurality of coils 11 are arranged in an array. It has two layers, a second layer (second coil array layer), and these two layers are laminated in parallel.
  • 5A is a first coil array layer of the wireless power supply apparatus 300
  • FIG. 5B is a second coil array layer of the wireless power supply apparatus 300
  • FIG. 5C is a front view of the wireless power supply apparatus 300
  • FIG. 5D each coil 11 included in the second layer is indicated by a thick line for convenience, but the shape and size of the coil are the same as each coil 11 included in the first layer and have the same resonance frequency. .
  • the coils 11 of the coil units 10 are arranged with a periodic interval W without any gap.
  • the adjacent coils 11 are not in electrical contact with each other but are sufficiently packed.
  • nine coils 11 are arranged in the first layer, and one of the coils is set as the power transmission coil 110 according to the function switching by the function switching unit 12 connected to each coil, and the rest.
  • the coil is set as the open coil 130.
  • the function switching part 12 is not shown in the figure.
  • coils 11 of the same size are arranged with a periodic interval W that is the same as the periodic interval of the first layer without a gap. Again, the adjacent coils are not in electrical contact, but are fully packed. Specifically, 16 coils 11 are arranged and arranged in the second layer, four coils 11 straddling the power transmission coil 110 are set as repeater coils 120, and the rest are set as open coils 130.
  • the first layer and the second layer are stacked and arranged such that the coil centers are shifted in the horizontal and vertical directions by W / 2. Further, the four repeater coils 120 of the second layer are arranged so as to evenly straddle. Note that the positional relationship between the power transmission coil 110 and the repeater coil 120 in FIG. 5 is the same as the coil arrangement in the wireless power feeding apparatus 200 in FIG. 4. That is, a wireless power feeding apparatus 300 shown in FIG. 5 is obtained by incorporating the coil arrangement shown in FIG. 4 into the coil array shown in FIG. 5 and making all the remaining coils open.
  • FIG. 6 is a graph showing the transmission efficiency of the wireless power feeder 300 having the coil arrangement.
  • the graph of FIG. 6 shows 3 of the center (position A) of the feeding coil (power transmission coil), the boundary with the adjacent coil (position B), and the region between the four coils (position C) shown in FIG.
  • the transmission efficiency is shown when a power receiving coil is installed 15 mm directly above one point.
  • the solid line in the graph of FIG. 6 shows the transmission efficiency in the wireless power feeder 300 shown in FIG. Further, the dotted line in the graph of FIG. 6 indicates the transmission efficiency in the wireless power feeding apparatus according to the background art (Non-Patent Document 2) in which eight repeater coils are arranged in the same plane so as to surround the first-layer power transmission coil. Is shown.
  • a high transmission efficiency of 84% is obtained when the power transmission coil and the power reception coil face each other on the same axis (position A), but at the boundary position (position B) with the adjacent coil. In the region sandwiched between 42% and 4 coils (position C), it rapidly decreases to 1.5%.
  • the transmission efficiency is slightly reduced to 62% at the position A, but the same 60% level is maintained as 65% at the position B and 61% at the position C. It can be seen that high transmission efficiency is realized in a wide area.
  • the wireless power feeder according to the first embodiment is a wireless power feeder that supplies power to a power receiving coil using a magnetic field resonance method, and includes a power transmission coil connected to an oscillation circuit, and a power transmission coil. And a power relay coil that is stacked and overlapped with a portion.
  • the method of propagating the resonance state by overlapping the repeater coil on the power transmission coil can suppress power reception sensitivity unevenness and realize stable power transmission over a wide range, and the positional deviation between the power transmission coil and the power reception coil.
  • a magnetic resonance type wireless power feeding apparatus that maintains high power transmission / reception efficiency can be provided.
  • the wireless power feeding apparatus of the present invention uses a magnetic field resonance method
  • the coil arranged in a layered state with a part of the power transmission coil can function as a repeater coil that relays power, and covers a wide range. Good power supply efficiency can be realized.
  • the wireless power feeder includes at least one first coil array layer including at least one power transmission coil connected to the oscillation circuit, and at least one power relay coil arranged so as to overlap with a part of the power transmission coil.
  • a second coil array layer includes a plurality of coils periodically arranged in a two-dimensional shape, and the second coil array layer is decentered with respect to the plurality of coils included in the first coil array layer. It includes a plurality of coils periodically arranged in a two-dimensional state. At least one of the plurality of coils included in the first coil array layer is connected to the oscillation circuit to form a power transmission coil.
  • the coil adjacent to the power transmission coil is an open coil whose both ends are open, and among the plurality of coils included in the second coil array layer, the coil arranged in a state overlapping with a part of the power transmission coil has both ends This is a short-circuited power relay coil.
  • the function switching unit switches between the plurality of coils included in the first and second coil array layers by individually switching between connecting the two ends of the coil to the oscillation circuit, short-circuiting, or opening. Each is switched between a power transmission coil, a power relay coil, or an open coil.
  • a coil unit in which the coil and the function switching circuit are integrally formed is periodically arranged in the first and second coil array layers, whereby a wireless power feeding apparatus can be constructed.
  • the arrangement of the power transmission coil and the repeater coil (power relay coil) shown in FIG. 4 is used as a basic shape, which is incorporated into a planar two-layer coil array, and the other coils are open coils.
  • the present invention is not limited to this.
  • both ends of the coil adjacent to the power transmission coil may be short-circuited and set as a repeater coil.
  • FIG. 7A is a first coil array layer of the wireless power feeder 400
  • FIG. 7B is a second coil array layer of the wireless power feeder 400
  • FIG. 7C is a front view of the wireless power feeder 400
  • FIG. 7D is a plan view of the wireless power feeder 400.
  • the 16 coils 11 across the power transmission coil 110 and the repeater coil 120 in the first coil array layer are set as the repeater coil 120 in the second coil array layer.
  • the repeater coils are combined so as to cross over each other in the first coil array layer and the second coil array layer, so that the power transmission area is expanded around the power transmission coil 110.
  • the transmission efficiency decreases as the distance from the power transmission coil 110 increases. Therefore, the coil arrangement shown in FIG. 5 or the coil arrangement shown in FIG. 7 is selected by switching at the function switching unit according to the use situation or the like in the wireless power feeding apparatus using the magnetic field resonance method. Is preferred.
  • the eight coils surrounding the power transmission coil 110 are changed to the repeater coil 120 in the first coil array layer including the transmission coil. Absent.
  • a coil that is adjacent to the power transmission coil 110 and is located near the power receiving coil may be set as the repeater coil 120, and the other coil may be set as the open coil 130.
  • the eight coils surrounding the coil 110 may be set as the repeater coil 120, and the outer coil may be set as the open coil 130. This is to keep the resonance state from the power transmission coil 110 unnecessarily propagating outward and lowering the power supply efficiency to the reception coil within a certain range.
  • the function switching unit selects which coil is the transmission coil among the plurality of coils included in the wireless power feeding device based on the position of the power receiving coil. For example, the function switching unit switches a coil arranged at a position closest to the power receiving coil among a plurality of coils included in the first coil array layer as a power transmission coil and other coils as an open coil. . In addition, the function switching unit switches among the plurality of coils included in the second coil array layer, a coil arranged in a state straddling the power transmission coil as a power relay coil, and another coil as an open coil. You may comprise in this way.
  • the wireless power feeding apparatus may be configured to newly include a detection unit that detects the position of the power receiving coil or a specific unit that specifies the coil closest to the position of the power receiving coil.
  • the function switching unit may switch the coil closest to the position to the power transmission coil based on the position of the power receiving coil detected by the detection unit.
  • the closest coil can be the coil closest to the position of the power receiving coil among the coils included in the first coil array layer.
  • the existing various detection methods can be employ
  • FIG. 8 shows a modification in which two adjacent coils included in the first coil array layer are connected to an oscillation circuit to form a power transmission coil 110 and another coil adjacent to the two power transmission coils 110 is an open coil 130. It is a figure which shows an example.
  • FIG. 8A is a diagram showing a first coil array layer of the wireless power feeding apparatus of the modification according to Embodiment 1.
  • FIG. 8B is a diagram showing a second coil array layer of the wireless power feeding apparatus according to the modification according to Embodiment 1.
  • FIG. 8C is a diagram illustrating a front view of the wireless power feeding apparatus of the wireless power feeding apparatus according to the modification according to the first embodiment.
  • FIG. 8D is a diagram illustrating a plan view of a wireless power feeding apparatus according to a modification example of the first embodiment.
  • the second coil array layer six coils that overlap with a part of the two power transmission coils 110 are set as the repeater coil 120, and the other coils are set as the open coils 130.
  • the wireless power feeder shown in FIGS. 9 and 10 is a wireless power feeder having a wider area in the power feeding area, and five coils included in the first coil array layer function as power transmission coils.
  • the other coils included in the first coil array layer are set as open coils.
  • a coil that overlaps a part of the five power transmission coils is set as a repeater coil, and the other coils are set as open coils.
  • other coils included in the first coil array layer are set as repeater coils.
  • a coil that overlaps a part of the power transmission coil and the repeater coil is set as the repeater coil.
  • all the coils included in the second coil array layer straddle the power transmission coil or repeater coil included in the first coil array layer, all the coils are set as repeater coils.
  • a wireless power supply system that can cope with a case where a plurality of power receiving objects exist is provided. Further, by appropriately distributing the power transmission coils, it is possible to suppress a decrease in received power at a position far from the power transmission coils.
  • Embodiment 2 The second embodiment of the present invention will be described below with reference to the drawings.
  • the wireless power feeder according to Embodiment 2 of the present invention is characterized in that the size of the coil is smaller than that of the coil unit. Note that a part of the description already given in Embodiment 1 is omitted for the sake of clarity.
  • the size of the coil 11 is large up to the limit of the coil unit 10, and the coils in the adjacent coil units can be arranged sufficiently close to each other. Met.
  • a coil unit having a coil diameter D of W ⁇ D with respect to the distance W between the centers of the coils is used.
  • the coil diameter D is smaller than the distance W between the centers of adjacent coils due to mounting restrictions and the like.
  • a coil array is formed by laying tile-shaped coil units 210 having coils 11 at the center as shown in FIG.
  • the tile width and the coil center spacing W are the same length.
  • FIG. 12 is a diagram for explaining the relationship between the coil diameter and the inter-coil spacing and the relationship between the power transmission coil and the repeater coil.
  • FIG. 12A is a diagram showing the first coil array layer.
  • FIG. 12B is a diagram showing the second coil array layer.
  • FIG. 12C is a diagram illustrating a front view of the wireless power feeding apparatus according to the present embodiment.
  • FIG. 12D is a diagram illustrating a plan view of the wireless power feeding device according to the present embodiment.
  • FIG. 12C and FIG. 12D only the coils arranged on the tile are displayed for convenience.
  • a wireless power feeding apparatus capable of maintaining high power feeding efficiency in a wide area even when the relationship between the coil diameter D and the inter-coil center distance W is W ⁇ D ⁇ 2 is provided. It is an object.
  • FIG. 13 is a diagram for explaining a plurality of coil arrangements constituting the wireless power feeding apparatus 500 according to the second embodiment.
  • FIG. 13A is a first coil array layer included in the wireless power feeding apparatus 500
  • FIG. 13B is a wireless power feeding.
  • FIG. 13C shows a third coil array layer included in the wireless power feeding apparatus 500
  • FIG. 13D shows a fourth coil array layer included in the wireless power feeding apparatus 500, respectively.
  • the first coil array layer includes a power transmission coil, and the other coils are set as open coils.
  • the plurality of coils included in the second coil array layer are arranged such that the centers are shifted in the vertical direction by W / 2 with respect to the plurality of coils included in the first coil array layer.
  • a coil straddling the power transmission coil included in the first coil array layer is set as a repeater coil, and the other coils are set as open coils.
  • the plurality of coils included in the third coil array layer are arranged such that the center is laterally shifted by W / 2 with respect to the plurality of coils included in the first coil array layer.
  • a coil straddling the power transmission coil included in the first coil array layer is set as a repeater coil, and the other coils are set as open coils.
  • the plurality of coils included in the fourth coil array layer are arranged such that the centers are shifted by W / 2 in the vertical and horizontal directions with respect to the plurality of coils included in the first coil array layer.
  • W D ⁇ 2
  • FIG. 14A is a front view of the wireless power feeding apparatus 500
  • FIG. 14B is a left side view of the wireless power feeding apparatus 500
  • FIG. 14C is a plan view of the wireless power feeding apparatus 500.
  • the wireless power feeding apparatus 500 it is possible to straddle the power transmission coil 110 and the repeater coil 120 in the range of W ⁇ 2D, and when W ⁇ 2D, more coil array layers are added to the intermediate layer. Need to be arranged as.
  • a wireless power feeding apparatus may be configured by arranging a plurality of coil array layers for power relay as in the wireless power feeding apparatus 500.
  • the wireless power feeding device includes a first coil array layer including at least one power transmission coil, a second coil array layer including at least one repeater coil arranged in a state straddling the power transmission coil, and the repeater coil.
  • the third coil array layer includes at least one repeater coil arranged in a straddling state.
  • the repeater coil included in the third coil array layer straddles the repeater coil included in the second coil array layer, but does not overlap the power transmission coil included in the first coil array layer.
  • the wireless power feeding device of the present invention has a power reception sensitivity unevenness by propagating a resonance state by arranging a power relay coil and a power relay coil in a state of overlapping a part of the power transmission coil. And stable power transmission over a wide range can be realized.
  • a wireless power receiving apparatus 600 shown in FIG. 15 includes a power receiving coil 140 and a plurality of repeater coils 120 straddling it.
  • the configuration of the wireless power receiving apparatus can be a configuration of various types of wireless power receiving apparatuses in which the power transmitting coil is changed to the power receiving coil in each of the wireless power transmitting apparatuses described in the above embodiments.
  • a wireless power feeding apparatus that supplies power to a power receiving coil using a magnetic field resonance method, and is arranged so as to overlap a first coil array layer including at least one power transmitting coil connected to an oscillation circuit and a part of the power transmitting coil And a second coil array layer including at least one of the relayed power relay coils.
  • the first coil array layer includes a plurality of coils periodically arranged two-dimensionally, and the second coil array layer is centered with respect to the plurality of coils included in the first coil array layer.
  • the wireless power feeding apparatus includes a plurality of coils periodically arranged in a two-dimensional manner in a shifted state, and at least one of the plurality of coils included in the first coil array layer is connected to the oscillation circuit to form the power transmission coil
  • the wireless power feeding apparatus according to appendix 1, wherein: (Appendix 3) Among the plurality of coils included in the first coil array layer, the coil adjacent to the transmission coil is an open coil whose both ends are open, and among the plurality of coils included in the second coil array layer,
  • the wireless power feeding apparatus according to appendix 2, wherein the coil arranged in a state of being overlapped with a part of the transmission coil is a power relay coil with both ends short-circuited.
  • the coil adjacent to the transmission coil is a power relay coil with both ends short-circuited, and among the plurality of coils included in the second coil array layer
  • the coil disposed in a state of being overlapped with a part of the transmission coil or a part of the power relay coil adjacent to the transmission coil is a power relay coil whose both ends are short-circuited.
  • the wireless power feeding apparatus By switching individually the two ends of a plurality of coils included in the first coil array layer and the second coil array layer, respectively, connected to the oscillation circuit, short-circuited, or opened,
  • the wireless power feeding apparatus according to any one of appendices 2 to 4, further comprising a switching unit that switches between each of the plurality of coils as a transmission coil, a power relay coil, or an open coil.
  • the plurality of coils included in the first coil array layer are aligned with a gap W between the coil centers, and the plurality of coils included in the second coil array layer include the first coil array layer.
  • the wireless power feeding apparatus wherein the plurality of coils arranged in a line are arranged in a line with a gap W between the coil centers without gaps in a state shifted by a distance of W / 2 in the vertical and horizontal directions.
  • Appendix 7 Appendix 6 wherein the relationship between the diameter D of the plurality of coils included in each of the first coil array layer and the second coil array layer and the distance W between the coil centers is D ⁇ W ⁇ D ⁇ 2.
  • the wireless power supply arrangement described in 1. (Appendix 8) The switching unit switches a coil disposed at a position closest to the power receiving coil among the plurality of coils included in the first coil array layer as a transmission coil and other coils as an open coil.
  • the coil arranged in a state overlapping with a part of the power transmission coil among the plurality of coils included in the second coil array layer is switched to a power relay coil, and the other coil is switched to an open coil.
  • the wireless power feeder according to 5 to 7. (Appendix 9)
  • the switching unit is configured to switch a coil disposed at a position closest to the power receiving coil among the plurality of coils included in the first coil array layer as a transmitting coil and another coil as a power relay coil.
  • the wireless power feeding apparatus according to any one of appendices 5 to 7, wherein switching is performed so that the plurality of coils included in the second coil array layer are power relay coils.
  • the plurality of coils included in each of the four layers from the first coil array layer to the fourth coil array layer satisfy a relationship of a coil diameter D and a coil center interval W of D ⁇ 2 ⁇ W ⁇ 2D.
  • the plurality of coils arranged in alignment in the second coil array layer have a coil center distance W / 2 in the first direction with respect to the plurality of coils arranged in alignment in the first coil array layer.
  • the plurality of coils that are arranged in an offset manner and arranged in the third coil array layer have a coil center that is aligned with the plurality of coils that are arranged in alignment in the first coil array layer.
  • the plurality of coils that are arranged in the direction perpendicular to the first direction by a distance of W / 2 and arranged in the fourth coil array layer are arranged in the first coil array layer.
  • Appendix 13 is characterized in that the coil centers are aligned and shifted by W / 2 in the first direction and in the direction orthogonal to the first direction with respect to the plurality of coils. Described Line power supply device. (Appendix 15) Among the plurality of coils arranged in alignment in the second coil array layer, both ends of the coil that overlaps a part of the power transmission coil included in the first coil array layer are short-circuited to form a power relay coil, and others Coil that overlaps with a part of the power transmission coil included in the first coil array layer among the plurality of coils arranged in the third coil array layer by opening both ends of the coil.
  • the second coil array layer is the second coil array layer among the plurality of coils arranged in alignment with the fourth coil array layer.
  • both ends of the coil that overlaps a part of the power break coil included in the third coil array layer are short-circuited to form a power relay coil, and both ends of the other coils are opened and turned off.
  • the wireless power supply device Characterized by Punkoiru, the wireless power supply device according to Appendix 14.
  • Appendix 16 The wireless power feeding apparatus according to appendix 15, wherein the second coil array layer and the third coil array layer are replaced with one layer on the same plane including a plurality of adjacent coils.
  • Appendix 17 A wireless power feeding apparatus, wherein all of the open coils described in appendix 15 or 16 are replaced with repeater coils.
  • Appendix 20 A method of using a coil in a wireless power feeding apparatus that supplies power to a power receiving coil using a magnetic field resonance method, wherein a plurality of coils are periodically arranged in a two-dimensional manner, and at least one coil is In the second coil array layer in which a plurality of coils are periodically arranged in a two-dimensional manner in a state of being stacked on the first coil array layer in a state of being connected to the oscillation circuit to be a power transmission coil, it overlaps with a part of the power transmission coil.
  • the coil usage method which short-circuits the both ends of the coil laminated
  • a wireless power receiving apparatus that receives power wirelessly transmitted from a power transmission coil using a magnetic field resonance method, the first coil array layer including at least one power receiving coil connected to an oscillation circuit, and a part of the power receiving coil
  • a wireless power receiving apparatus comprising: a second coil array layer including at least one power relay coil arranged in an overlapping state.
  • Coil unit 11 Coil 12 Function switching part 13 Oscillation circuit 14 Switch 100 Wireless power feeding device 110 Power transmission coil 120 Power relay coil (repeater coil) 130 Open coil 140 Power receiving coil 600 Wireless power receiver

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Abstract

The purpose of the present invention is to provide a magnetic-resonance wireless power supply device for maintaining a high efficiency of power transmission/reception with respect to positional deviation between a power transmission coil and a power reception coil. This wireless power supply device (100) supplies power to a power-receiving coil by using a magnetic-resonance format, wherein the device has a first coil array layer comprising at least one power transmission coil (110) connected to an oscillation circuit (13), and a second coil array layer comprising at least one power relay coil (120) arranged in a state straddling the power transmission coil (110). Adopting this configuration makes it possible to supply power at high efficiency even when the power receiving coil is situated elsewhere than directly above the power transmission coil.

Description

無線給電装置、コイル使用方法Wireless power supply device, coil usage method
　本発明は、磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置（ワイヤレス給電装置）及び当該無線給電装置に含まれるコイルの使用方法に関する。 The present invention relates to a wireless power feeding device (wireless power feeding device) that supplies power to a power receiving coil using a magnetic field resonance method and a method of using a coil included in the wireless power feeding device.
　同一周波数で共振（共鳴）するコイル間の磁界結合を利用した給電方式である磁界共鳴型の無線給電（ワイヤレス給電）に関する技術が開示されている（例えば特許文献１）。また、磁界共鳴型無線給電に関する多くの周辺技術が開発されている。 A technique related to magnetic field resonance type wireless power feeding (wireless power feeding), which is a power feeding method using magnetic field coupling between coils that resonate (resonate) at the same frequency, is disclosed (for example, Patent Document 1). Many peripheral technologies related to magnetic field resonance type wireless power feeding have been developed.
　図１６のグラフに示すように、磁界共鳴型の無線給電は、電磁誘導型の無線給電と比べて送受コイル間の距離が長い領域においても高効率で給電できるという特長を持つ。また、磁界共鳴型無線給電は、コイル間の位置関係が多少変動しても給電効率が大きく変動しないという利点を有する。 As shown in the graph of FIG. 16, the magnetic resonance type wireless power feeding has a feature that power can be fed with high efficiency even in a region where the distance between the transmitting and receiving coils is long as compared with the electromagnetic induction type wireless power feeding. In addition, the magnetic field resonance type wireless power feeding has an advantage that the power feeding efficiency does not vary greatly even if the positional relationship between the coils slightly varies.
　このような特徴を有する磁界共鳴型無線給電において、受電距離を更に伸ばすために、コイルの両端を短絡した共振コイル（以下、リピータコイル又は電力中継コイルと呼ぶ）を図１７のように同心円上に配置する手法が開示されている（特許文献２）。 In the magnetic field resonance type wireless power feeding having such a feature, a resonance coil (hereinafter referred to as a repeater coil or a power relay coil) in which both ends of the coil are short-circuited on a concentric circle as shown in FIG. An arrangement method is disclosed (Patent Document 2).
　また、図１８に示すように同一平面上に同じ共振周波数のコイルを並べておき、そのうちの１つを送電コイルとして使用し、他のコイルをショート構造すなわち送電回路も受電回路も接続せずコイル両端を短絡したリピータコイルとして使用する方法が開示されている。このような構成とすることで、送電コイルの共振状態が周囲のコイルに伝播するため、周囲のリピータコイル上に受電コイルを配置した場合でも高い受電電力を得ることが出来ることが知られている（非特許文献１）。 In addition, as shown in FIG. 18, coils having the same resonance frequency are arranged on the same plane, one of them is used as a power transmission coil, and the other coil is short-circuited, that is, neither the power transmission circuit nor the power reception circuit is connected. Is used as a short-circuited repeater coil. With such a configuration, since the resonance state of the power transmission coil propagates to the surrounding coils, it is known that high received power can be obtained even when the power receiving coil is arranged on the surrounding repeater coil. (Non-Patent Document 1).
　また、図１９に示すように、平面内の縦横にリピータコイルを配置し、２次元的に広がりを持つ給電エリアを実現した無線給電装置が開示されている（非特許文献２）。 Further, as shown in FIG. 19, a wireless power feeding apparatus is disclosed in which repeater coils are arranged vertically and horizontally in a plane to realize a power feeding area having a two-dimensional spread (Non-Patent Document 2).
　また、特許文献３には、伝送不能な点を縮小等し、より広い範囲で安定した電力伝送を実現する非接触電力伝送装置が開示されている。当該装置では、重畳した複数の一次側コイルの背面に軟磁性材を配置することで磁気結合を向上させて出力向上を図ると共に、一次側コイルの夫々に電源を接続し、隣接する一次側コイルに特定の位相差で電流を流すことで、伝送効率の向上を実現している。 Further, Patent Document 3 discloses a non-contact power transmission device that realizes stable power transmission in a wider range by reducing the point where transmission is impossible. In the apparatus, a soft magnetic material is arranged on the back surface of a plurality of superimposed primary coils so as to improve output by improving magnetic coupling, and a power source is connected to each of the primary coils, and adjacent primary coils are connected. The transmission efficiency is improved by flowing current with a specific phase difference.
特表２００９－５０１５１０号公報Special table 2009-501510 米国特許出願公開第２０１０／０３２７６６０号明細書US Patent Application Publication No. 2010/0327660 特開２００９－２５２９７０号公報JP 2009-252970 A
　ワイヤレス給電においては、送受電コイルの位置ずれによる給電効率の低下が使用の上で最も大きな課題の一つとして認識されている。この点で、比較的位置ずれに強い磁界共鳴型無線給電においてリピータコイルを用いて給電エリアを更に拡大している非特許文献２の無線給電装置は、他の無線給電装置と比べて大きな利点を有している。 In wireless power supply, a decrease in power supply efficiency due to the displacement of the power transmission / reception coil is recognized as one of the biggest problems in use. In this respect, the wireless power supply apparatus of Non-Patent Document 2 that further expands the power supply area using a repeater coil in magnetic resonance wireless power supply that is relatively resistant to positional deviation has a great advantage over other wireless power supply apparatuses. Have.
　しかしながら、非特許文献２の無線給電装置では、図１９に示す、送電コイルとリピータコイルの接する位置（位置Ｂ）や、送電コイルと隣り合うリピータコイル３個に囲まれた領域（位置Ｃ）では、送電コイルの直上の位置（位置Ａ）と比べ、受電電力が大きく低下するという課題が存在していた。 However, in the wireless power feeding apparatus of Non-Patent Document 2, in a position (position B) where the power transmission coil and the repeater coil are in contact with each other and a region surrounded by three repeater coils adjacent to the power transmission coil (position C) shown in FIG. As compared with the position (position A) immediately above the power transmission coil, there has been a problem that received power is greatly reduced.
また、特許文献３の電力伝送装置においても平面方向に伝送不能な点を縮小する効果があるものの、電磁誘導型給電を利用しており、送受コイル間の距離が長い領域において給電効率が急激に低下し、給電可能な受電コイルの位置が限定されてしまう点で大きな課題を有していた。 The power transmission device of Patent Document 3 also has an effect of reducing the point where transmission is impossible in the plane direction, but uses electromagnetic induction power feeding, and the power feeding efficiency is drastically in a region where the distance between the transmitting and receiving coils is long. It has a big problem in that the position of the power receiving coil that is lowered and can be fed is limited.
　本発明は、上記課題を鑑み、送電コイルと受電コイルとの位置ずれに対して高い送受電効率を維持する磁界共鳴型の無線給電装置を提供することを目的とする。 In view of the above problems, an object of the present invention is to provide a magnetic resonance type wireless power feeding apparatus that maintains high power transmission / reception efficiency with respect to positional deviation between a power transmission coil and a power reception coil.
　本発明の無線給電装置は、磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置であって、発振回路に接続される送電コイルを少なくとも１つ含む第１コイルアレー層と、前記送電コイルに跨る状態で配置された電力中継コイルを少なくとも１つ含む第２コイルアレー層と、を有する。 The wireless power supply apparatus of the present invention is a wireless power supply apparatus that supplies power to a power receiving coil using a magnetic field resonance method, and includes a first coil array layer including at least one power transmission coil connected to an oscillation circuit, and the power transmission And a second coil array layer including at least one power relay coil arranged across the coil.
　また、本発明のコイル使用方法は、磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置におけるコイル使用方法であって、複数のコイルが２次元状に周期的に配列された第１コイルアレー層において、少なくとも１つのコイルを発振回路に接続して送電コイルとし、前記第１コイルアレー層に積層する状態で複数のコイルが２次元状に周期的に配列された第２コイルアレー層において、前記送電コイルに跨る状態で配置されたコイルの両端を短絡して電力中継コイルとすることを特徴とする。 The coil usage method of the present invention is a coil usage method in a wireless power feeder that supplies power to a power receiving coil using a magnetic field resonance method, and is a first in which a plurality of coils are periodically arranged in a two-dimensional manner. In the coil array layer, a second coil array layer in which at least one coil is connected to an oscillation circuit to form a power transmission coil, and a plurality of coils are periodically arranged in a two-dimensional manner in a state of being stacked on the first coil array layer. In this case, both ends of the coil arranged in a state straddling the power transmission coil are short-circuited to form a power relay coil.
　本発明によれば、送電コイルと受電コイルとの位置ずれに対して高い送受電効率を維持する磁界共鳴型の無線給電装置を提供することができる。 According to the present invention, it is possible to provide a magnetic resonance type wireless power feeding apparatus that maintains high power transmission / reception efficiency with respect to a positional deviation between a power transmission coil and a power reception coil.
本発明に係るコイルユニットの構成を示す図である。It is a figure which shows the structure of the coil unit which concerns on this invention. 本発明のコイルユニットに含まれる送電コイルの等価回路と略記号とを示す図である。It is a figure which shows the equivalent circuit and abbreviated symbol of the power transmission coil contained in the coil unit of this invention. 本発明のコイルユニットに含まれる受電コイルの等価回路と略記号とを示す図である。It is a figure which shows the equivalent circuit and abbreviated symbol of the receiving coil contained in the coil unit of this invention. 本発明のコイルユニットに含まれるリピータコイルの等価回路と略記号とを示す図である。It is a figure which shows the equivalent circuit and abbreviated symbol of the repeater coil contained in the coil unit of this invention. 本発明のコイルユニットに含まれるオープンコイルの等価回路と略記号とを示す図である。It is a figure which shows the equivalent circuit and abbreviated symbol of the open coil contained in the coil unit of this invention. 実施の形態１に係る無線給電装置１００の斜視図を示す図である。1 is a perspective view of a wireless power feeding apparatus 100 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置１００の正面図を示す図である。1 is a diagram showing a front view of a wireless power feeding apparatus 100 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置１００の平面図を示す図である。1 is a plan view of a wireless power supply apparatus 100 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置２００の斜視図を示す図である。2 is a diagram illustrating a perspective view of a wireless power feeding apparatus 200 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置２００の正面図を示す図である。3 is a diagram illustrating a front view of a wireless power feeding apparatus 200 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置２００の平面図を示す図である。3 is a diagram illustrating a plan view of a wireless power feeding apparatus 200 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置３００の第１コイルアレー層を示す図である。3 is a diagram showing a first coil array layer of the wireless power feeding apparatus 300 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置３００の第２コイルアレー層を示す図である。3 is a diagram showing a second coil array layer of the wireless power feeding apparatus 300 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置３００の正面図を示す図である。3 is a diagram illustrating a front view of a wireless power feeding apparatus 300 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置３００の平面図を示す図である。3 is a diagram illustrating a plan view of a wireless power feeding apparatus 300 according to Embodiment 1. FIG. 無線給電装置３００における送電コイル周辺での伝送効率を示すグラフである。4 is a graph showing transmission efficiency around a power transmission coil in the wireless power feeder 300. 実施の形態１に係る別形態の無線給電装置４００の第１コイルアレー層を示す図である。6 is a diagram showing a first coil array layer of another form of wireless power supply apparatus 400 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置４００の第２コイルアレー層を示す図である。6 is a diagram showing a second coil array layer of wireless power supply apparatus 400 according to Embodiment 1. FIG. 実施の形態１に係る無線給電装置４００の正面図を示す図である。3 is a diagram showing a front view of wireless power supply apparatus 400 according to Embodiment 1. FIG. 実施の形態１に係る別形態の無線給電装置４００の平面図を示す図である。6 is a plan view of another embodiment of wireless power supply apparatus 400 according to Embodiment 1. FIG. 実施の形態１に係る変形例の無線給電装置の第１コイルアレー層を示す図である。6 is a diagram showing a first coil array layer of a wireless power feeding device of a modification according to Embodiment 1. FIG. 実施の形態１に係る変形例の無線給電装置の第２コイルアレー層を示す図である。FIG. 6 is a diagram showing a second coil array layer of the wireless power feeding apparatus according to the modification according to the first embodiment. 実施の形態１に係る変形例の無線給電装置の無線給電装置の正面図を示す図である。FIG. 6 is a diagram showing a front view of a wireless power feeding device of a wireless power feeding device of a modification according to the first embodiment. 実施の形態１に係る変形例の無線給電装置の平面図を示す図である。FIG. 10 is a diagram illustrating a plan view of a wireless power feeding device according to a modification example of the first embodiment. 実施の形態１に係る別形態の無線給電装置の構成を説明する図である。3 is a diagram illustrating a configuration of a wireless power feeding device according to another embodiment according to Embodiment 1. FIG. 実施の形態１に係る別形態の無線給電装置の構成を説明する図である。3 is a diagram illustrating a configuration of a wireless power feeding device according to another embodiment according to Embodiment 1. FIG. 実施の形態２に係るタイル状のコイルユニットを示す図である。6 is a diagram showing a tile-shaped coil unit according to Embodiment 2. FIG. 第１コイルアレー層を示す図である。It is a figure which shows a 1st coil array layer. 第２コイルアレー層を示す図である。It is a figure which shows a 2nd coil array layer. 本実施の形態にかかる無線給電装置の正面図を示す図である。It is a figure which shows the front view of the wireless electric power feeder concerning this Embodiment. 本実施の形態にかかる無線給電装置の平面図を示す図である。It is a figure which shows the top view of the wireless electric power feeder concerning this Embodiment. 実施の形態２に係る無線給電装置５００を構成するコイルアレー層を示す図である。6 is a diagram showing a coil array layer that constitutes a wireless power feeding apparatus 500 according to Embodiment 2. FIG. 実施の形態２に係る無線給電装置５００に含まれる第２コイルアレー層を示す図である。6 is a diagram showing a second coil array layer included in a wireless power feeding apparatus 500 according to Embodiment 2. FIG. 実施の形態２に係る無線給電装置５００に含まれる第３コイルアレー層を示す図である。6 is a diagram illustrating a third coil array layer included in a wireless power feeding apparatus 500 according to Embodiment 2. FIG. 実施の形態２に係る無線給電装置５００に含まれる第４コイルアレー層を示す図である。6 is a diagram showing a fourth coil array layer included in wireless power feeding apparatus 500 according to Embodiment 2. FIG. 実施の形態２に係る無線給電装置５００の正面図を示す図である。6 is a diagram illustrating a front view of a wireless power feeding apparatus 500 according to Embodiment 2. FIG. 実施の形態２に係る無線給電装置５００の左側面図を示す図である。FIG. 6 is a left side view of a wireless power feeding apparatus 500 according to Embodiment 2. 実施の形態２に係る無線給電装置５００の平面図を示す図である。6 is a plan view of a wireless power feeding apparatus 500 according to Embodiment 2. FIG. 本発明に係る無線受電装置の構成を説明する図である。It is a figure explaining the structure of the radio | wireless power receiving apparatus which concerns on this invention. 背景技術に係る電磁誘導方式と磁界共鳴方式の電力到達距離を説明する図である。It is a figure explaining the electric power arrival distance of the electromagnetic induction system and magnetic field resonance system which concern on background art. 背景技術に係る電力到達距離を伸ばす磁界共鳴型無線給電方法を説明する図である。It is a figure explaining the magnetic field resonance type radio | wireless electric power feeding method which extends the electric power reachable distance which concerns on background art. 背景技術に係る位置ずれを許容する磁界共鳴型無線給電方法を説明する図である。It is a figure explaining the magnetic field resonance type radio | wireless electric power feeding method which accept | permits the position shift which concerns on background art. 背景技術に係る位置ずれに耐性を有する磁界共鳴型無線給電方法を説明する図である。It is a figure explaining the magnetic field resonance type | mold radio | wireless electric power feeding method which has tolerance to the position shift which concerns on background art.
　（実施の形態１）
　以下、図面を参照して本発明の実施の形態について説明する。図１は、本発明の実施の形態１に係る磁界共鳴方式を用いた無線給電装置１００の主要な構成要素であるコイルユニット１０の構成を示すブロック図である。コイルユニット１０は、コイル１１と、機能切換部１２と、を備える。 (Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a coil unit 10 that is a main component of a wireless power feeding apparatus 100 using a magnetic field resonance method according to Embodiment 1 of the present invention. The coil unit 10 includes a coil 11 and a function switching unit 12.
　コイル１１は、機能切換部１２による機能切り換えにより、送電コイル、リピータコイル、オープンコイルのいずれかの機能を有するコイルとなる。ここで、リピータコイルは、受電距離を延ばすために、送電コイルより供給される電力を中継するコイルであるため、以下の説明ではリピータコイルを電力中継コイルと称することがある。 The coil 11 becomes a coil having a function of a power transmission coil, a repeater coil, or an open coil by function switching by the function switching unit 12. Here, since the repeater coil is a coil that relays the power supplied from the power transmission coil in order to extend the power reception distance, the repeater coil may be referred to as a power relay coil in the following description.
　コイル１１は、プリント基板の技術により作成することが出来る。このようなコイルとしては、例えば、直径４０ｍｍの八角形のコイルパターンで９ターン巻いてインダクタンス３．４２μＨとしたものにキャパシタを直列に接続し、コイルの浮遊容量と合わせたトータル容量を３９ｐＦとしたものを用いることができる。この場合のコイル１１の共振周波数は、ｆ０＝１／２π√（ＬＣ）＝１３．７８ＭＨｚとなる。 The coil 11 can be formed by a printed circuit board technology. As such a coil, for example, a capacitor is connected in series with an octagonal coil pattern having a diameter of 40 mm and wound by 9 turns to have an inductance of 3.42 μH, and the total capacitance combined with the stray capacitance of the coil is 39 pF. Things can be used. In this case, the resonance frequency of the coil 11 is f 0 = ½π√ (LC) = 13.78 MHz.
　機能切換部１２は、コイル１１の機能を送電コイル、リピータコイル、オープンコイル、のいずれかから選択する。機能切換部１２は、具体的には、発振回路１３とスイッチ１４とを備える機能切換回路で構成される。 The function switching unit 12 selects the function of the coil 11 from any one of a power transmission coil, a repeater coil, and an open coil. Specifically, the function switching unit 12 includes a function switching circuit including an oscillation circuit 13 and a switch 14.
　発振回路１３は、一定の周波数を持つ交流信号を出力する回路であり、例えば、クラップ型など、比較的簡単な回路で実現できる。クラップ型発振回路は、トランジスタとキャパシタとインダクタとを備える。 The oscillation circuit 13 is a circuit that outputs an AC signal having a constant frequency, and can be realized by a relatively simple circuit such as a clap type. The clap type oscillation circuit includes a transistor, a capacitor, and an inductor.
　スイッチ１４は、コイル１１の機能を切り換えるスイッチである。スイッチ１４は、コイル１１を送電コイルとして用いる場合は、コイル１１の両端を発振回路１３に接続する（図中では最上位）。スイッチ１４は、コイル１１をリピータコイルとして用いる場合はコイル１１の両端子を短絡の位置に接続する（図中では最下位）。スイッチ１４は、コイル１１をオープンコイルとして用いる場合はコイル１１を開放し、何も接続されてない状態とする（図中では中央位置）。 The switch 14 is a switch for switching the function of the coil 11. When the coil 11 is used as a power transmission coil, the switch 14 connects both ends of the coil 11 to the oscillation circuit 13 (the highest level in the figure). When the coil 11 is used as a repeater coil, the switch 14 connects both terminals of the coil 11 to the short-circuited position (the lowest level in the figure). When the coil 11 is used as an open coil, the switch 14 opens the coil 11 so that nothing is connected (center position in the figure).
　図２Ａ～図２Ｄに各コイルの等価回路と略記号とを示す。図２Ａは、送電コイルの等価回路と略記号とを示す図である。図２Ｂは受電コイルの等価回路と略記号とを示す図である。図２Ｃは、リピータコイルの等価回路と略記号とを示す図である。図２Ｄはオープンコイルの等価回路と略記号とを示す図である。なお、図２Ｂに示す受電コイルは、他と同様のコイルに負荷を接続して用いる。受電コイルの負荷の先には、負荷として受電した電力をＤＣに変換する整流回路及びレギュレータが配置されており、これらを介して得られた電力が受電側の電力源として用いられる。なお、以下の説明では便宜上、各機能を有する各コイルについて図２に示す略記号を用いて説明する。 2A to 2D show equivalent circuits and abbreviated symbols for each coil. FIG. 2A is a diagram illustrating an equivalent circuit and abbreviated symbols of the power transmission coil. FIG. 2B is a diagram showing an equivalent circuit and abbreviated symbols of the power receiving coil. FIG. 2C is a diagram showing an equivalent circuit and abbreviated symbols of the repeater coil. FIG. 2D is a diagram showing an equivalent circuit and abbreviated symbols of the open coil. Note that the power receiving coil shown in FIG. 2B is used with a load connected to the same coil as the others. A rectifier circuit and a regulator that convert electric power received as a load into DC are arranged at the tip of the load of the power receiving coil, and the electric power obtained through these is used as a power source on the power receiving side. In the following description, for convenience, each coil having each function will be described using the abbreviations shown in FIG.
　図３は、実施の形態１に係る無線給電装置１００の構成を示す図である。図３Ａ～図３Ｃは、それぞれ無線給電装置１００の斜視図、正面図、平面図を示している。また、図中、図２の凡例に従って磁界共鳴の送電コイルを"送"、リピータコイルを"リ"、そして、受電コイルを"受"、とそれぞれ示している。 FIG. 3 is a diagram illustrating a configuration of the wireless power supply apparatus 100 according to the first embodiment. 3A to 3C respectively show a perspective view, a front view, and a plan view of the wireless power feeding apparatus 100. Further, in the figure, according to the legend of FIG. 2, the magnetic field resonance power transmission coil is shown as “sending”, the repeater coil as “re”, and the power receiving coil as “receiving”.
　無線給電装置１００は、２つのコイルユニット１０を備える。１つのコイルユニット１０に含まれるコイル１１が送電コイル１１０として、他方のコイルユニット１０に含まれるコイル１１がリピータコイル１２０として設定されている。以下の図では、便宜上コイル１１のみを図示し、機能切換部１２は省略している。 The wireless power supply apparatus 100 includes two coil units 10. A coil 11 included in one coil unit 10 is set as a power transmission coil 110, and a coil 11 included in the other coil unit 10 is set as a repeater coil 120. In the following drawings, only the coil 11 is shown for convenience, and the function switching unit 12 is omitted.
　図３Ｂからもわかるように、無線給電装置１００は、発振回路に接続された送電コイル１１０を有する第１層と、電力中継コイル１２０を有する第２層と、の２つのコイル層が平行に積層されて構成される。また、図３Ｃからもわかるように、第２層に含まれる電力中継コイル１２０は、第１層に含まれる送電コイル１１０の一部分と重なる状態で配置されている。 As can be seen from FIG. 3B, the wireless power feeding apparatus 100 includes two coil layers, a first layer having a power transmission coil 110 connected to an oscillation circuit and a second layer having a power relay coil 120, which are stacked in parallel. Configured. Further, as can be seen from FIG. 3C, the power relay coil 120 included in the second layer is arranged so as to overlap a part of the power transmission coil 110 included in the first layer.
　このように、リピータコイル１２０が送電コイル１１０を跨ぐことによって、送電コイル１１０とリピータコイル１２０の重なり付近の磁束密度が向上し、重なり付近の直上に受電コイルが配置された場合においても、受電電力の低下が避けられる。 Thus, when the repeater coil 120 straddles the power transmission coil 110, the magnetic flux density near the overlap of the power transmission coil 110 and the repeater coil 120 is improved, and even when the power reception coil is disposed immediately above the overlap, the received power Can be avoided.
　図４は、送電コイルに跨るように４つのリピータコイルを配置した場合の無線給電装置２００の構成を示す図である。それぞれ、図４Ａは無線給電装置２００の斜視図、図４Ｂは、無線給電装置２００の正面図、図４Ｃは、無線給電装置２００の平面図、を示している。図４Ｂ、図４Ｃからもわかるように、無線給電装置２００は、発振回路に接続された送電コイル１１０を有する第１層と、４つの電力中継コイル１２０を有する第２層と、の２つのコイル層が積層されて構成される。第２層に含まれる４つの電力中継コイル１２０は、第１層に含まれる送電コイル１１０の一部分と重なる状態で配置されている。 FIG. 4 is a diagram illustrating a configuration of the wireless power feeding apparatus 200 when four repeater coils are arranged so as to straddle the power transmission coil. 4A is a perspective view of the wireless power supply apparatus 200, FIG. 4B is a front view of the wireless power supply apparatus 200, and FIG. 4C is a plan view of the wireless power supply apparatus 200. As can be seen from FIGS. 4B and 4C, the wireless power feeding apparatus 200 includes two coils, a first layer having a power transmission coil 110 connected to an oscillation circuit and a second layer having four power relay coils 120. Layers are stacked. The four power relay coils 120 included in the second layer are arranged so as to overlap with a part of the power transmission coil 110 included in the first layer.
　このように、４つのリピータコイル１２０が送電コイル１１０を均等に跨ぐ構成とすることで送電コイル１１０の回りにおける感度低下領域を更に大きく低減することが出来る。 As described above, the sensitivity reduction region around the power transmission coil 110 can be further reduced by configuring the four repeater coils 120 to cross the power transmission coil 110 evenly.
　図３及び図４に示した無線給電装置におけるコイル配置を基本形として、２次元的に給電エリアをカバーした無線給電装置３００の構成を図５に示す。磁界共鳴型である無線給電装置３００は、複数のコイル１１がアレー状に整列して配置された第１層（第１コイルアレー層）と複数のコイル１１がアレー状に整列して配置された第２層（第２コイルアレー層）の２つの層を有し、これら２つの層が平行に積層されて構成される。図５Ａは、無線給電装置３００の第１コイルアレー層、図５Ｂは無線給電装置３００の第２コイルアレー層、図５Ｃは無線給電装置３００の正面図、図５Ｄは無線給電装置３００の平面図、をそれぞれ示している。なお、図５Ｄにおいて便宜上第２層に含まれる各コイル１１を太線で示しているが、コイルの形状や大きさは第１層に含まれる各コイル１１と同一であり、同一の共振周波数を有する。 FIG. 5 shows a configuration of a wireless power supply apparatus 300 that covers a power supply area two-dimensionally based on the coil arrangement in the wireless power supply apparatus shown in FIGS. The wireless power supply apparatus 300 of the magnetic field resonance type has a first layer (first coil array layer) in which a plurality of coils 11 are arranged in an array and a plurality of coils 11 are arranged in an array. It has two layers, a second layer (second coil array layer), and these two layers are laminated in parallel. 5A is a first coil array layer of the wireless power supply apparatus 300, FIG. 5B is a second coil array layer of the wireless power supply apparatus 300, FIG. 5C is a front view of the wireless power supply apparatus 300, and FIG. , Respectively. In FIG. 5D, each coil 11 included in the second layer is indicated by a thick line for convenience, but the shape and size of the coil are the same as each coil 11 included in the first layer and have the same resonance frequency. .
　第１層には、各コイルユニット１０のコイル１１が隙間なく周期間隔Ｗで整列して配置されている。なお、隣同士のコイル１１は電気的な接触はないが、充分に詰めて配置される。具体的には、第１層は９個のコイル１１が整列配置されており、各コイルに接続された機能切換部１２による機能切換に従って、そのうちの１つのコイルが送電コイル１１０に設定され、残りのコイルがオープンコイル１３０に設定されている。なお、略記号で表記している為、機能切換部１２は図中には示していない。 In the first layer, the coils 11 of the coil units 10 are arranged with a periodic interval W without any gap. The adjacent coils 11 are not in electrical contact with each other but are sufficiently packed. Specifically, nine coils 11 are arranged in the first layer, and one of the coils is set as the power transmission coil 110 according to the function switching by the function switching unit 12 connected to each coil, and the rest. The coil is set as the open coil 130. In addition, since it represents with the abbreviation symbol, the function switching part 12 is not shown in the figure.
　第２層には、第１層と同様に同サイズのコイル１１が隙間なく第１層の周期間隔と同一である周期間隔Ｗで整列して配置される。こちらも、隣同士のコイルは電気的な接触はないが、充分に詰めて配置されている。具体的には、第２層は１６個のコイル１１が整列配置されており、送電コイル１１０に跨る４つのコイル１１をリピータコイル１２０に設定され、残りはオープンコイル１３０に設定される。 In the second layer, similarly to the first layer, coils 11 of the same size are arranged with a periodic interval W that is the same as the periodic interval of the first layer without a gap. Again, the adjacent coils are not in electrical contact, but are fully packed. Specifically, 16 coils 11 are arranged and arranged in the second layer, four coils 11 straddling the power transmission coil 110 are set as repeater coils 120, and the rest are set as open coils 130.
　図５Ｄの平面図からもわかるように、第１層と第２層をコイル中心がＷ／２だけ縦横にずらした位置関係となるように積層配置することで、第１層の送電コイル１１０上に第２層の４つのリピータコイル１２０が均等に跨るように配置されている。なお、図５における送電コイル１１０及びリピータコイル１２０の位置関係は図４の無線給電装置２００におけるコイル配置と同一である。すなわち、図４のコイル配置を基本形として図５のコイルアレー中に組込み、残りのコイルを全てオープンにしたものが図５に示す無線給電装置３００である。 As can be seen from the plan view of FIG. 5D, the first layer and the second layer are stacked and arranged such that the coil centers are shifted in the horizontal and vertical directions by W / 2. Further, the four repeater coils 120 of the second layer are arranged so as to evenly straddle. Note that the positional relationship between the power transmission coil 110 and the repeater coil 120 in FIG. 5 is the same as the coil arrangement in the wireless power feeding apparatus 200 in FIG. 4. That is, a wireless power feeding apparatus 300 shown in FIG. 5 is obtained by incorporating the coil arrangement shown in FIG. 4 into the coil array shown in FIG. 5 and making all the remaining coils open.
　図６は、当該コイル配列を有する無線給電装置３００の伝送効率を示すグラフである。図６のグラフは、図１９で示した、給電コイル（送電コイル）の中心（位置Ａ）、隣のコイルとの境界（位置Ｂ）、４つのコイルの間の領域（位置Ｃ）、の３つの地点の直上１５ｍｍに受電コイルを設置した場合の伝送効率を示している。 FIG. 6 is a graph showing the transmission efficiency of the wireless power feeder 300 having the coil arrangement. The graph of FIG. 6 shows 3 of the center (position A) of the feeding coil (power transmission coil), the boundary with the adjacent coil (position B), and the region between the four coils (position C) shown in FIG. The transmission efficiency is shown when a power receiving coil is installed 15 mm directly above one point.
　図６のグラフにおける実線は、図５に示す無線給電装置３００における伝送効率を示している。また、図６のグラフにおける点線は、第１層の送電コイルの回りを取り囲むように同一平面内に８個のリピータコイルを配置した背景技術（非特許文献２）に係る無線給電装置における伝送効率を示している。 The solid line in the graph of FIG. 6 shows the transmission efficiency in the wireless power feeder 300 shown in FIG. Further, the dotted line in the graph of FIG. 6 indicates the transmission efficiency in the wireless power feeding apparatus according to the background art (Non-Patent Document 2) in which eight repeater coils are arranged in the same plane so as to surround the first-layer power transmission coil. Is shown.
　背景技術に係る無線給電装置では、送電コイルと受電コイルが同軸上で向き合っている場合（位置Ａ）では８４％という高い伝送効率が得られるが、隣のコイルとの境界位置（位置Ｂ）では４２％、４つのコイルに挟まれた領域（位置Ｃ）では１．５％と急激に低下している。一方、本実施の形態１の無線給電装置３００では、位置Ａでは６２％と伝送効率がわずかに低下するものの、位置Ｂで６５％、位置Ｃで６１％と同じ６０％台を保っており、高い伝送効率が広いエリアで実現されていることが分かる。 In the wireless power feeder according to the background art, a high transmission efficiency of 84% is obtained when the power transmission coil and the power reception coil face each other on the same axis (position A), but at the boundary position (position B) with the adjacent coil. In the region sandwiched between 42% and 4 coils (position C), it rapidly decreases to 1.5%. On the other hand, in the wireless power feeding apparatus 300 according to the first embodiment, the transmission efficiency is slightly reduced to 62% at the position A, but the same 60% level is maintained as 65% at the position B and 61% at the position C. It can be seen that high transmission efficiency is realized in a wide area.
　以上のように、本実施の形態１に係る無線給電装置は、磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置であって、発振回路に接続される送電コイルと、送電コイルの一部分と重なる状態で積層配置された電力中継コイルと、を備える。 As described above, the wireless power feeder according to the first embodiment is a wireless power feeder that supplies power to a power receiving coil using a magnetic field resonance method, and includes a power transmission coil connected to an oscillation circuit, and a power transmission coil. And a power relay coil that is stacked and overlapped with a portion.
　このように、送電コイルにリピータコイルを重ねて共振状態を伝播させる手法により、受電感度ムラを抑制し、広範囲な安定した電力伝送を実現することができ、送電コイルと受電コイルとの位置ずれに対して高い送受電効率を維持する磁界共鳴型の無線給電装置を提供することができる。 In this way, the method of propagating the resonance state by overlapping the repeater coil on the power transmission coil can suppress power reception sensitivity unevenness and realize stable power transmission over a wide range, and the positional deviation between the power transmission coil and the power reception coil. On the other hand, a magnetic resonance type wireless power feeding apparatus that maintains high power transmission / reception efficiency can be provided.
　このような構成を、電磁誘導方式を用いた給電装置で実現する場合、一部が跨る複数のコイルを配置した場合でも、それぞれのコイルに個別の電源回路が必要であり、当該配置したコイルに送信コイルからの電力を中継する効果は無く、返って送信コイルから供給される電力が吸収されてしまい、給電効率の低下を招くことになる。 When such a configuration is realized by a power feeding device using an electromagnetic induction method, even when a plurality of coils that are partially crossed are arranged, individual power supply circuits are necessary for each coil, and There is no effect of relaying the power from the transmission coil, and the power supplied from the transmission coil is absorbed and the power supply efficiency is reduced.
　一方、本発明の無線給電装置は、磁界共鳴方式を用いるため、送電コイルの一部と重なる状態で積層配置されたコイルが電力を中継するリピータコイルとして機能させることができ、広い範囲に渡って良好な給電効率を実現することができる。 On the other hand, since the wireless power feeding apparatus of the present invention uses a magnetic field resonance method, the coil arranged in a layered state with a part of the power transmission coil can function as a repeater coil that relays power, and covers a wide range. Good power supply efficiency can be realized.
　ここで、より好ましくは、無線給電装置は、発振回路に接続される送電コイルを少なくとも１つ含む第１コイルアレー層と、前記送電コイルの一部分と重なる状態で配置された電力中継コイルを少なくとも１つ含む第２コイルアレー層と、を有する。第１コイルアレー層は、２次元状に周期的に配列された複数のコイルを含み、第２コイルアレー層は、前記第１コイルアレー層に含まれる前記複数のコイルに対して中心がずれた状態で２次元状に周期的に配列された複数のコイルを含む。そして、第１コイルアレー層に含まれる複数のコイルの中の少なくとも一つが前記発振回路に接続されて送電コイルとなる。当該送電コイルに隣接するコイルは両端が開放されたオープンコイルであり、第２コイルアレー層に含まれる複数のコイルの中で、前記送電コイルの一部分と重なる状態で配置されているコイルは両端が短絡された電力中継コイルである。 More preferably, the wireless power feeder includes at least one first coil array layer including at least one power transmission coil connected to the oscillation circuit, and at least one power relay coil arranged so as to overlap with a part of the power transmission coil. A second coil array layer. The first coil array layer includes a plurality of coils periodically arranged in a two-dimensional shape, and the second coil array layer is decentered with respect to the plurality of coils included in the first coil array layer. It includes a plurality of coils periodically arranged in a two-dimensional state. At least one of the plurality of coils included in the first coil array layer is connected to the oscillation circuit to form a power transmission coil. The coil adjacent to the power transmission coil is an open coil whose both ends are open, and among the plurality of coils included in the second coil array layer, the coil arranged in a state overlapping with a part of the power transmission coil has both ends This is a short-circuited power relay coil.
　このような構成とすることで、２次元状の幅広い領域において送電コイルと受電コイルとの位置ずれに対して高い送受電効率を維持することができる。 With such a configuration, it is possible to maintain high power transmission / reception efficiency with respect to the positional deviation between the power transmission coil and the power reception coil in a wide two-dimensional region.
　なお、第１コイルアレー層及び前記第２コイルアレー層にそれぞれ含まれる複数のコイルが上述した送電コイル、電力中継コイル、オープンコイル、のいずれとして機能するかは、各コイルに接続された機能切換部（機能切換回路）によって実現される。すなわち、機能切換部は、コイルの両端を発振回路に接続するか、又は短絡するか、又は開放するか、を個別に切り換えることで、第１及び第２コイルアレー層に含まれる複数のコイルの各々を送電コイルとするか、又は電力中継コイルとするか、又はオープンコイルとするか、を切り換える。当該コイルと機能切換回路が一体として形成されたコイルユニットが第１、第２コイルアレー層にそれぞれ周期的に整列配置されることで、無線給電装置を構築することができる。 Note that whether the plurality of coils included in each of the first coil array layer and the second coil array layer functions as the above-described power transmission coil, power relay coil, or open coil is a function switching connected to each coil. Part (function switching circuit). That is, the function switching unit switches between the plurality of coils included in the first and second coil array layers by individually switching between connecting the two ends of the coil to the oscillation circuit, short-circuiting, or opening. Each is switched between a power transmission coil, a power relay coil, or an open coil. A coil unit in which the coil and the function switching circuit are integrally formed is periodically arranged in the first and second coil array layers, whereby a wireless power feeding apparatus can be constructed.
　なお、上記説明では、図４の送電コイルとリピータコイル（電力中継コイル）の配置を基本形として、それを平面状の２層のコイルアレーに対して組み込み、その他のコイルはオープンコイルとするコイル配置について説明したが、これに限るものではない。例えば位置ずれに対する許容エリアを更に拡大するために、送電コイルに隣接するコイルの両端を短絡してリピータコイルに設定しても良い。 In the above description, the arrangement of the power transmission coil and the repeater coil (power relay coil) shown in FIG. 4 is used as a basic shape, which is incorporated into a planar two-layer coil array, and the other coils are open coils. However, the present invention is not limited to this. For example, in order to further expand the permissible area for misalignment, both ends of the coil adjacent to the power transmission coil may be short-circuited and set as a repeater coil.
　図７に示す無線給電装置４００では、第１コイルアレー層に含まれる送電コイル１１０周囲の８個のオープンコイル１３０をリピータコイル１２０に変更している。図７Ａは、無線給電装置４００の第１コイルアレー層、図７Ｂは無線給電装置４００の第２コイルアレー層、図７Ｃは無線給電装置４００の正面図、図７Ｄは無線給電装置４００の平面図、をそれぞれ示している。当該変更に合わせて第２コイルアレー層において第１コイルアレー層における送電コイル１１０とリピータコイル１２０を跨ぐ１６個のコイル１１をリピータコイル１２０に設定している。 7, eight open coils 130 around the power transmission coil 110 included in the first coil array layer are changed to the repeater coil 120. 7A is a first coil array layer of the wireless power feeder 400, FIG. 7B is a second coil array layer of the wireless power feeder 400, FIG. 7C is a front view of the wireless power feeder 400, and FIG. 7D is a plan view of the wireless power feeder 400. , Respectively. In accordance with the change, the 16 coils 11 across the power transmission coil 110 and the repeater coil 120 in the first coil array layer are set as the repeater coil 120 in the second coil array layer.
　図７に示すコイル配置では、第１コイルアレー層及び第２コイルアレー層でリピータコイル同士が跨ぎあうように組み合わせているため、送電コイル１１０周囲に送電可能エリアが広がる。これは、多くのリピータコイル１２０が駆動されるため、リピータコイル１２０の等価直列抵抗などの損失成分が、トータルで大きく影響するためである。また、同じ理由により、送電コイル１１０から離れるほど伝送効率が低下する。従って、磁界共鳴方式を利用する無線給電装置におけるコイル配置として図５に示すコイル配置とするか図７に示すコイル配置とするかは、使用状況等に応じて機能切換部で切り換えて選択することが好ましい。 In the coil arrangement shown in FIG. 7, the repeater coils are combined so as to cross over each other in the first coil array layer and the second coil array layer, so that the power transmission area is expanded around the power transmission coil 110. This is because many repeater coils 120 are driven, so that loss components such as the equivalent series resistance of the repeater coil 120 greatly affect the total. For the same reason, the transmission efficiency decreases as the distance from the power transmission coil 110 increases. Therefore, the coil arrangement shown in FIG. 5 or the coil arrangement shown in FIG. 7 is selected by switching at the function switching unit according to the use situation or the like in the wireless power feeding apparatus using the magnetic field resonance method. Is preferred.
　なお、図７に示す無線給電装置４００では、送信コイルを含む第１コイルアレー層において、送電コイル１１０を囲む８個のコイルをリピータコイル１２０に変更する場合について説明したが、これに限るものではない。例えば、送電コイル１１０に隣接するコイルであって受電コイルに近い位置に配置されているコイルをリピータコイル１２０に設定し、その他のコイルをオープンコイル１３０に設定しても良い。また、第１コイルアレー層が３×３＝９個のコイルではなく、４×４＝１６個のコイル、又は更に多くのコイルを含む場合には、送信コイル１１０に隣接する４つのコイル又は送信コイル１１０を囲む８個のコイルをリピータコイル１２０に設定し、その外側のコイルをオープンコイル１３０に設定しても良い。送電コイル１１０からの共振状態が不必要に外側に向かって伝搬し、受信コイルへの給電効率が低下することを一定の範囲に留めるためである。 In the wireless power feeding apparatus 400 illustrated in FIG. 7, the case where the eight coils surrounding the power transmission coil 110 are changed to the repeater coil 120 in the first coil array layer including the transmission coil has been described. Absent. For example, a coil that is adjacent to the power transmission coil 110 and is located near the power receiving coil may be set as the repeater coil 120, and the other coil may be set as the open coil 130. Further, when the first coil array layer includes 4 × 4 = 16 coils or more coils instead of 3 × 3 = 9 coils, four coils adjacent to the transmission coil 110 or transmission The eight coils surrounding the coil 110 may be set as the repeater coil 120, and the outer coil may be set as the open coil 130. This is to keep the resonance state from the power transmission coil 110 unnecessarily propagating outward and lowering the power supply efficiency to the reception coil within a certain range.
　また、無線給電装置に含まれる複数のコイルの中で、どのコイルを送信コイルとするかは、受電コイルの位置に基づいて機能切換部が選択することが好ましい。例えば、機能切換部は、第１コイルアレー層に含まれる複数のコイルの中で、受電コイルに最も近い位置に配置されているコイルを送電コイルとし、その他のコイルをオープンコイルとする切り換えを行う。また、機能切換部は、第２コイルアレー層に含まれる複数のコイルの中で、送電コイルに跨る状態で配置されたコイルを電力中継コイルとし、その他のコイルをオープンコイルとする切り換えを行う。このように構成しても良い。また、この場合は無線給電装置に、受電コイルの位置を検出する検出部、又は、受電コイルの位置に最も近いコイルを特定する特定部が新たに設けられる構成であっても良い。この場合機能切換部は、検出部が検出した受電コイルの位置に基づいて、当該位置に最も近いコイルを送電コイルに切り換えても良い。ここで、最も近いコイルは第１コイルアレー層に含まれるコイルの中で最も受電コイルの位置に近いコイルとすることができる。なお、上記検出部における受電コイルの検出方法は既存の様々な検出方法を採用することが可能である。 In addition, it is preferable that the function switching unit selects which coil is the transmission coil among the plurality of coils included in the wireless power feeding device based on the position of the power receiving coil. For example, the function switching unit switches a coil arranged at a position closest to the power receiving coil among a plurality of coils included in the first coil array layer as a power transmission coil and other coils as an open coil. . In addition, the function switching unit switches among the plurality of coils included in the second coil array layer, a coil arranged in a state straddling the power transmission coil as a power relay coil, and another coil as an open coil. You may comprise in this way. Further, in this case, the wireless power feeding apparatus may be configured to newly include a detection unit that detects the position of the power receiving coil or a specific unit that specifies the coil closest to the position of the power receiving coil. In this case, the function switching unit may switch the coil closest to the position to the power transmission coil based on the position of the power receiving coil detected by the detection unit. Here, the closest coil can be the coil closest to the position of the power receiving coil among the coils included in the first coil array layer. In addition, the existing various detection methods can be employ | adopted for the detection method of the receiving coil in the said detection part.
　なお、上記説明では、送電コイルが１つである場合について説明したがこれに限るものではない。例えば、図８は第１コイルアレー層に含まれる隣接した２つのコイルをそれぞれ発振回路に接続して送電コイル１１０とし、当該２つの送電コイル１１０に隣接する他のコイルをオープンコイル１３０とした変形例を示す図である。図８Ａは、実施の形態１に係る変形例の無線給電装置の第１コイルアレー層を示す図である。図８Ｂは実施の形態１に係る変形例の無線給電装置の第２コイルアレー層を示す図である。図８Ｃは実施の形態１に係る変形例の無線給電装置の無線給電装置の正面図を示す図である。図８Ｄは実施の形態１に係る変形例の無線給電装置の平面図を示す図である。この場合、第２コイルアレー層において、当該２つの送電コイル１１０の一部分と重なる６個のコイルをリピータコイル１２０とし、その他のコイルをオープンコイル１３０に設定される。このように構成することで、１つの送電コイル１１０を用いて給電する場合と比較して、広い領域において高い伝送効率を実現することができる。 In the above description, the case where there is one power transmission coil has been described, but the present invention is not limited to this. For example, FIG. 8 shows a modification in which two adjacent coils included in the first coil array layer are connected to an oscillation circuit to form a power transmission coil 110 and another coil adjacent to the two power transmission coils 110 is an open coil 130. It is a figure which shows an example. FIG. 8A is a diagram showing a first coil array layer of the wireless power feeding apparatus of the modification according to Embodiment 1. FIG. 8B is a diagram showing a second coil array layer of the wireless power feeding apparatus according to the modification according to Embodiment 1. FIG. 8C is a diagram illustrating a front view of the wireless power feeding apparatus of the wireless power feeding apparatus according to the modification according to the first embodiment. FIG. 8D is a diagram illustrating a plan view of a wireless power feeding apparatus according to a modification example of the first embodiment. In this case, in the second coil array layer, six coils that overlap with a part of the two power transmission coils 110 are set as the repeater coil 120, and the other coils are set as the open coils 130. By configuring in this way, it is possible to realize high transmission efficiency in a wide region as compared with the case where power is supplied using one power transmission coil 110.
　その他、無線給電装置におけるコイル配置として、図９又は図１０のように配置することも可能である。図９及び図１０に示す無線給電装置では、より広いエリアを給電エリアにもつ無線給電装置であり、共に第１コイルアレー層に含まれる５つのコイルが送電コイルとして機能する。 In addition, as the coil arrangement in the wireless power feeding apparatus, it is possible to arrange as shown in FIG. 9 or FIG. The wireless power feeder shown in FIGS. 9 and 10 is a wireless power feeder having a wider area in the power feeding area, and five coils included in the first coil array layer function as power transmission coils.
　図９では、第１コイルアレー層に含まれる他のコイルはオープンコイルに設定される。第２コイルアレー層に含まれる複数のコイルの内、当該５つの送電コイルの一部分と重なるコイルがリピータコイルに、その他のコイルがオープンコイルに設定される。 In FIG. 9, the other coils included in the first coil array layer are set as open coils. Of the plurality of coils included in the second coil array layer, a coil that overlaps a part of the five power transmission coils is set as a repeater coil, and the other coils are set as open coils.
　図１０では、第１コイルアレー層に含まれる他のコイルがリピータコイルに設定される。第２コイルアレー層に含まれる複数のコイルの内、当該送電コイル及びリピータコイルの一部分と重なるコイルがリピータコイルに設定される。ここでは、第２コイルアレー層に含まれる全てのコイルが第１コイルアレー層に含まれる送電コイル又はリピータコイルに跨るため、全てのコイルがリピータコイルに設定されている。 In FIG. 10, other coils included in the first coil array layer are set as repeater coils. Of the plurality of coils included in the second coil array layer, a coil that overlaps a part of the power transmission coil and the repeater coil is set as the repeater coil. Here, since all the coils included in the second coil array layer straddle the power transmission coil or repeater coil included in the first coil array layer, all the coils are set as repeater coils.
　このように、無線給電装置内に給電ポイントを複数配置することで受電対象物が複数存在している場合に対応できる無線給電方式となる。また、送電コイルを適度に分散しておくことにより、送電コイルから遠くの位置で受電電力の減少を抑制することができる。 Thus, by providing a plurality of power supply points in the wireless power supply apparatus, a wireless power supply system that can cope with a case where a plurality of power receiving objects exist is provided. Further, by appropriately distributing the power transmission coils, it is possible to suppress a decrease in received power at a position far from the power transmission coils.
　（実施の形態２）
　以下、図面を参照して本発明の実施の形態２について説明する。本発明の実施の形態２に係る無線給電装置は、コイルのサイズがコイルユニットに比べて小さいことを特徴とする。なお、実施の形態１で既に説明した部分については、発明の明確化のために一部説明を省略する。 (Embodiment 2)
The second embodiment of the present invention will be described below with reference to the drawings. The wireless power feeder according to Embodiment 2 of the present invention is characterized in that the size of the coil is smaller than that of the coil unit. Note that a part of the description already given in Embodiment 1 is omitted for the sake of clarity.
　実施の形態１に係る無線給電装置では、図６等に示すように、コイル１１のサイズがコイルユニット１０ぎりぎりまで大きく配置されており、隣接するコイルユニットにおける各コイルが充分近接して配置できる構成であった。即ちコイルの中心間間隔Ｗに対してコイルの直径ＤがＷ≒Ｄというコイルユニットを用いて構成されていた。 In the wireless power feeding apparatus according to the first embodiment, as shown in FIG. 6 and the like, the size of the coil 11 is large up to the limit of the coil unit 10, and the coils in the adjacent coil units can be arranged sufficiently close to each other. Met. In other words, a coil unit having a coil diameter D of W≈D with respect to the distance W between the centers of the coils is used.
　しかしながら、実装の制約等により、隣接するコイルの中心間間隔Ｗに比較してコイル直径Ｄは小さくなる。例えば、図１１に示すような中心にコイル１１を有するタイル状のコイルユニット２１０を敷き詰めてコイルアレーを形成する場合が考えられる。当該タイルを隙間なく敷き詰めるためタイル幅とコイル中心間間隔Ｗは同一の長さである。 However, the coil diameter D is smaller than the distance W between the centers of adjacent coils due to mounting restrictions and the like. For example, a case where a coil array is formed by laying tile-shaped coil units 210 having coils 11 at the center as shown in FIG. In order to spread the tiles without gaps, the tile width and the coil center spacing W are the same length.
　ここで、コイルサイズがコイルユニットの外形より少し小さい場合（Ｗ＞Ｄ）であっても、第１層に配置された送電コイルと第２層に配置されたリピータコイルに重なりがあれば、本発明の効果が期待でき、広い範囲における高効率給電を維持することができる。 Here, even if the coil size is slightly smaller than the outer shape of the coil unit (W> D), if there is an overlap between the power transmission coil arranged in the first layer and the repeater coil arranged in the second layer, this The effect of the invention can be expected, and high-efficiency power supply in a wide range can be maintained.
　図１２は、コイル直径とコイル間間隔との関係と、送電コイルとリピータコイルとの関係とを説明する図である。図１２Ａは第１コイルアレー層を示す図である。図１２Ｂは第２コイルアレー層を示す図である。図１２Ｃは本実施の形態にかかる無線給電装置の正面図を示す図である。図１２Ｄは本実施の形態にかかる無線給電装置の平面図を示す図である。しかしながら、図１２に示すように、Ｗ＝Ｄ√２まで広がると、第１コイルアレー層と第２コイルアレー層にそれぞれ含まれるコイルの重なり部分が消失する。なお、図１２Ｃ、図１２Ｄでは、便宜上タイル上に配置されたコイルのみ表示している。図１２におけるコイル配置は、図１９の背景技術に関するコイル配置と同等であり、且つ隣接していないコイルがオープンになっているという点で伝送効率の点で不利である。そこで本実施の形態２では、コイルの直径Ｄとコイル間中心間隔Ｗとの関係がＷ≧Ｄ√２となるような場合でも、広いエリアで高い給電効率を維持できる無線給電装置を供給することを目的としている。 FIG. 12 is a diagram for explaining the relationship between the coil diameter and the inter-coil spacing and the relationship between the power transmission coil and the repeater coil. FIG. 12A is a diagram showing the first coil array layer. FIG. 12B is a diagram showing the second coil array layer. FIG. 12C is a diagram illustrating a front view of the wireless power feeding apparatus according to the present embodiment. FIG. 12D is a diagram illustrating a plan view of the wireless power feeding device according to the present embodiment. However, as shown in FIG. 12, when W = D√2 is widened, the overlapping portions of the coils included in the first coil array layer and the second coil array layer disappear. In FIG. 12C and FIG. 12D, only the coils arranged on the tile are displayed for convenience. The coil arrangement in FIG. 12 is equivalent to the coil arrangement relating to the background art of FIG. 19 and is disadvantageous in terms of transmission efficiency in that non-adjacent coils are open. Therefore, in the second embodiment, a wireless power feeding apparatus capable of maintaining high power feeding efficiency in a wide area even when the relationship between the coil diameter D and the inter-coil center distance W is W ≧ D√2 is provided. It is an object.
　図１３は、本実施の形態２に係る無線給電装置５００を構成する複数のコイル配置を説明する図であり、図１３Ａは無線給電装置５００に含まれる第１コイルアレー層、図１３Ｂは無線給電装置５００に含まれる第２コイルアレー層、図１３Ｃは無線給電装置５００に含まれる第３コイルアレー層、図１３Ｄは無線給電装置５００に含まれる第４コイルアレー層、をそれぞれ示している。無線給電装置５００は、図１１に示すＷ＝Ｄ√２であるタイル状のコイルユニット２１０が同一平面内に周期的に配置されたコイルアレー層が第１コイルアレー層から第４コイルアレー層の順に４層にわたって積層配置されている。 FIG. 13 is a diagram for explaining a plurality of coil arrangements constituting the wireless power feeding apparatus 500 according to the second embodiment. FIG. 13A is a first coil array layer included in the wireless power feeding apparatus 500, and FIG. 13B is a wireless power feeding. FIG. 13C shows a third coil array layer included in the wireless power feeding apparatus 500, and FIG. 13D shows a fourth coil array layer included in the wireless power feeding apparatus 500, respectively. In the wireless power feeding apparatus 500, the coil array layers in which the tile-shaped coil units 210 having W = D√2 shown in FIG. 11 are periodically arranged in the same plane are formed from the first coil array layer to the fourth coil array layer. The four layers are sequentially stacked.
　第１コイルアレー層には、送電コイルが含まれ、その他のコイルはオープンコイルに設定されている。 The first coil array layer includes a power transmission coil, and the other coils are set as open coils.
　第２コイルアレー層に含まれる複数のコイルは、第１コイルアレー層に含まれる複数のコイルに対して中心が縦方向にＷ／２ずれて配置されている。ここで、第２コイルアレー層に含まれる複数のコイルの内、第１コイルアレー層に含まれる送電コイルに跨るコイルがリピータコイルに、その他のコイルがオープンコイルに設定されている。 The plurality of coils included in the second coil array layer are arranged such that the centers are shifted in the vertical direction by W / 2 with respect to the plurality of coils included in the first coil array layer. Here, among the plurality of coils included in the second coil array layer, a coil straddling the power transmission coil included in the first coil array layer is set as a repeater coil, and the other coils are set as open coils.
　第３コイルアレー層に含まれる複数のコイルは、第１コイルアレー層に含まれる複数のコイルに対して中心が横方向にＷ／２ずれて配置されている。ここで、第３コイルアレー層に含まれる複数のコイルの内、第１コイルアレー層に含まれる送電コイルに跨るコイルがリピータコイルに、その他のコイルがオープンコイルに設定されている。 The plurality of coils included in the third coil array layer are arranged such that the center is laterally shifted by W / 2 with respect to the plurality of coils included in the first coil array layer. Here, among the plurality of coils included in the third coil array layer, a coil straddling the power transmission coil included in the first coil array layer is set as a repeater coil, and the other coils are set as open coils.
　第４コイルアレー層に含まれる複数のコイルは、第１コイルアレー層に含まれる複数のコイルに対して中心が縦方向と横方向にそれぞれＷ／２ずれて配置されている。ここで、Ｗ＝Ｄ√２であるため、第４コイルアレー層に含まれる複数のコイルの中で、第１コイルアレー層に含まれる送電コイルに跨るコイルは存在しない。そこで第４コイルアレー層に含まれる複数のコイルの内、第２コイルアレー層及び第３コイルアレー層に含まれるリピータコイルに跨るコイルがリピータコイルに、その他のコイルがオープンコイルに設定される。 The plurality of coils included in the fourth coil array layer are arranged such that the centers are shifted by W / 2 in the vertical and horizontal directions with respect to the plurality of coils included in the first coil array layer. Here, since W = D√2, there is no coil straddling the power transmission coil included in the first coil array layer among the plurality of coils included in the fourth coil array layer. Therefore, among the plurality of coils included in the fourth coil array layer, a coil straddling the repeater coils included in the second coil array layer and the third coil array layer is set as a repeater coil, and the other coils are set as open coils.
　図１４Ａは、無線給電装置５００の正面図、図１４Ｂは無線給電装置５００の左側面図、図１４Ｃは無線給電装置５００の平面図、をそれぞれ示している。このように送電コイルを含む第１コイルアレー層に加えて、リピータコイルを配置した第２～第４のコイルアレー層を組み合わせることで、送電コイルに跨ぐリピータを確保し、送電コイルの回りに受電電力の大きく低下する領域を作らない工夫がなされている。すなわち、送電コイルの縦方向及び横方向にＷ／２の位置を中心にもつコイルをリピータコイルとして機能させるために、第１コイルアレー層と第４コイルアレー層の中間に第２コイルアレー層と第３コイルアレー層を追加している。これら中間層に含まれるリピータコイルは、第１コイルアレー層の送電コイルと第４コイルアレー層のリピータコイルの両方に跨って電力を中継する。 14A is a front view of the wireless power feeding apparatus 500, FIG. 14B is a left side view of the wireless power feeding apparatus 500, and FIG. 14C is a plan view of the wireless power feeding apparatus 500. Thus, in addition to the first coil array layer including the power transmission coil, by combining the second to fourth coil array layers in which the repeater coils are arranged, a repeater across the power transmission coil is secured, and power is received around the power transmission coil. Ingenuity has been made not to create a region where power is greatly reduced. That is, in order to cause a coil having a W / 2 position in the longitudinal and lateral directions of the power transmission coil to function as a repeater coil, the second coil array layer is interposed between the first coil array layer and the fourth coil array layer. A third coil array layer is added. The repeater coils included in these intermediate layers relay power across both the power transmission coils of the first coil array layer and the repeater coils of the fourth coil array layer.
　このような構成とすることで、コイル間間隔がコイル直径よりも大きい場合においても広いエリアで高効率の給電を維持することができる。但し、上記無線給電装置５００において送電コイル１１０とリピータコイル１２０を跨がせることが出来るのはＷ＜２Ｄの範囲であり、Ｗ≧２Ｄとなる場合には、更に多くのコイルアレー層を中間層として配置する必要がある。 With such a configuration, high-efficiency power supply can be maintained in a wide area even when the inter-coil spacing is larger than the coil diameter. However, in the wireless power feeding apparatus 500, it is possible to straddle the power transmission coil 110 and the repeater coil 120 in the range of W <2D, and when W ≧ 2D, more coil array layers are added to the intermediate layer. Need to be arranged as.
　なお、上記無線給電装置５００では、コイル直径Ｄとコイル間間隔Ｗとの関係がＤ√２≦Ｗ＜２Ｄである場合について説明したがこれに限るものではなく、Ｄ≦Ｗ＜Ｄ√２の場合においても、無線給電装置５００のように複数の電力中継用のコイルアレー層を配置して無線給電装置を構成しても良い。 In the wireless power feeding apparatus 500, the case where the relationship between the coil diameter D and the inter-coil spacing W is D√2 ≦ W <2D is not limited to this, but D ≦ W <D√2 Even in such a case, a wireless power feeding apparatus may be configured by arranging a plurality of coil array layers for power relay as in the wireless power feeding apparatus 500.
　なお、上記説明では、第１コイルアレー層に含まれる送電コイルに跨るリピータコイルを含むコイルアレー層として、第２、第３の２つのコイルアレー層を備える場合について説明したが、これに限るものではなく、どちらかのコイルアレー層のみ備える構成としても良い。すなわち、無線給電装置５００における第３コイルアレー層の片方を取り除き、第４コイルアレー層を新たな第３コイルアレー層としても良い。この場合、無線給電装置は、送電コイルを少なくとも１つ含む第１コイルアレー層と、当該送電コイルに跨る状態で配置されたリピータコイルを少なくとも１つ含む第２コイルアレー層と、当該リピータコイルに跨る状態で配置されるリピータコイルを少なくとも１つ含む第３コイルアレー層を有する構成となる。ここで、第３コイルアレー層に含まれるリピータコイルは、第２コイルアレー層に含まれるリピータコイルに跨る一方、第１コイルアレー層に含まれる前記送電コイルと重ならない。 In the above description, the case where the second and third coil array layers are provided as the coil array layer including the repeater coil straddling the power transmission coil included in the first coil array layer has been described. Instead, only one of the coil array layers may be provided. That is, one of the third coil array layers in the wireless power feeding apparatus 500 may be removed, and the fourth coil array layer may be used as a new third coil array layer. In this case, the wireless power feeding device includes a first coil array layer including at least one power transmission coil, a second coil array layer including at least one repeater coil arranged in a state straddling the power transmission coil, and the repeater coil. The third coil array layer includes at least one repeater coil arranged in a straddling state. Here, the repeater coil included in the third coil array layer straddles the repeater coil included in the second coil array layer, but does not overlap the power transmission coil included in the first coil array layer.
　以上各実施の形態で説明したように、本発明の無線給電装置は、送電コイルと、送電コイルの一部分と重なる状態で電力中継コイルを積層配置して共振状態を伝搬させることで、受電感度ムラを抑制し、広範囲な安定した電力伝送を実現することができる。 As described above in each embodiment, the wireless power feeding device of the present invention has a power reception sensitivity unevenness by propagating a resonance state by arranging a power relay coil and a power relay coil in a state of overlapping a part of the power transmission coil. And stable power transmission over a wide range can be realized.
　なお、上記説明では送電系について、感度低下領域の低減を実現する手法を述べたが、受電系に関しても同様の工夫が適用可能である。例えば、図４で説明した送電コイルとそれに跨る４つのリピータコイルを配置した送電系の構成を図１５のように受電系に適用することが可能である。図１５に示す無線受電装置６００は、受電コイル１４０とそれに跨る複数のリピータコイル１２０で構成される。このように受電コイル１４０の一部と重なる形でリピータコイル１２０が積層配置された無線受電装置６００を用いることで、位置ずれに対する感度変動を抑制することが出来る。 In the above description, the technique for realizing the reduction of the sensitivity reduction region is described for the power transmission system, but the same device can be applied to the power receiving system. For example, the configuration of the power transmission system in which the power transmission coil described in FIG. 4 and four repeater coils straddling it can be applied to the power reception system as shown in FIG. A wireless power receiving apparatus 600 shown in FIG. 15 includes a power receiving coil 140 and a plurality of repeater coils 120 straddling it. By using the wireless power receiving apparatus 600 in which the repeater coil 120 is stacked and overlapped with a part of the power receiving coil 140 as described above, it is possible to suppress the sensitivity fluctuation with respect to the positional deviation.
　なお、上記無線受電装置の構成は、上記各実施の形態で説明した各無線送電装置において送電コイルを受電コイルに変更した様々な形態の無線受電装置の構成とすることができる。 Note that the configuration of the wireless power receiving apparatus can be a configuration of various types of wireless power receiving apparatuses in which the power transmitting coil is changed to the power receiving coil in each of the wireless power transmitting apparatuses described in the above embodiments.
　なお、本発明は上記実施の形態に限られたものではなく、趣旨を逸脱しない範囲で適宜変更することが可能である。例えば、以下の形態をとることがきる。 Note that the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the spirit of the present invention. For example, it can take the following forms.
（付記１）
　磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置であって、発振回路に接続される送電コイルを少なくとも１つ含む第１コイルアレー層と、前記送電コイルの一部分と重なる状態で配置された電力中継コイルを少なくとも１つ含む第２コイルアレー層と、を有する無線給電装置。
（付記２）
　前記第１コイルアレー層は、２次元状に周期的に配列された複数のコイルを含み、前記第２コイルアレー層は、前記第１コイルアレー層に含まれる前記複数のコイルに対して中心がずれた状態で２次元状に周期的に配列された複数のコイルを含み、前記第１コイルアレー層に含まれる複数のコイルの中の少なくとも一つが前記発振回路に接続されて前記送電コイルとなることを特徴とする、付記１に記載の無線給電装置。
（付記３）
　前記第１コイルアレー層に含まれる複数のコイルの中で、前記送信コイルに隣接するコイルは両端が開放されたオープンコイルであり、前記第２コイルアレー層に含まれる複数のコイルの中で、前記送信コイルの一部分と重なる状態で配置されているコイルは両端が短絡された電力中継コイルであることを特徴とする、付記２に記載の無線給電装置。
（付記４）
　前記第１コイルアレー層に含まれる複数のコイルの中で、前記送信コイルに隣接するコイルは両端が短絡された電力中継コイルであり、前記第２コイルアレー層に含まれる複数のコイルの中で、前記送信コイルの一部分又は前記送信コイルに隣接する前記電力中継コイルの一部分と重なる状態で配置されているコイルは両端が短絡された電力中継コイルであることを特徴とする、付記２に記載の無線給電装置。
（付記５）
　前記第１コイルアレー層及び前記第２コイルアレー層にそれぞれ含まれる複数のコイルの両端を、前記発振回路に接続するか、又は短絡するか、又は開放するか、を個別に切り換えることで、前記複数のコイルの各々を送信コイルとするか、又は電力中継コイルとするか、又はオープンコイルとするか、を切り換える切り換え部を更に備える、付記２乃至４のいずれかに記載の無線給電装置。
（付記６）
　前記第１コイルアレー層に含まれる前記複数のコイルは、コイル中心間間隔Ｗで隙間なく整列配置されており、前記第２コイルアレー層に含まれる前記複数のコイルは、前記第１コイルアレー層で整列配置されている前記複数のコイルに対して縦横Ｗ／２の距離分ずらした状態でコイル中心間間隔Ｗで隙間なく整列配置されている、付記５に記載の無線給電装置。
（付記７）
前記第１コイルアレー層及び前記第２コイルアレー層にそれぞれ含まれる前記複数のコイルの直径Ｄと前記コイル中心間間隔Ｗの関係がＤ＜Ｗ＜Ｄ√２であることを特徴とする付記６に記載の無線給電配置。
（付記８）
　前記切り換え部は、前記第１コイルアレー層に含まれる前記複数のコイルの中で、受電コイルに最も近い位置に配置されているコイルを送信コイルとし、その他のコイルをオープンコイルとする切り換えを行い、前記第２コイルアレー層に含まれる前記複数のコイルの中で、前記送電コイルの一部分と重なる状態で配置されたコイルを電力中継コイルとし、その他のコイルをオープンコイルとする切り換えを行う、付記５乃至７に記載の無線給電装置。
（付記９）
　前記切り換え部は、前記第１コイルアレー層に含まれる前記複数のコイルの中で、受電コイルに最も近い位置に配置されているコイルを送信コイルとし、その他のコイルを電力中継コイルとする切り換えを行い、前記第２コイルアレー層に含まれる前記複数のコイルを電力中継コイルとする切り換えを行う、付記５乃至７に記載の無線給電装置。
（付記１０）
　前記第２コイルアレー層に含まれる前記電力中継コイルの一部分と重なる状態で配置される電力中継コイルを少なくとも１つ含む第３コイルアレー層を更に有する、付記１乃至７のいずれかに記載の無線給電装置。
（付記１１）
　前記第３コイルアレー層に含まれる前記電力中継コイルは、前記第１コイルアレー層に含まれる前記送電コイルと重ならないことを特徴とする、付記８に記載の無線給電装置。
（付記１２）
　前記送電コイルの一部分と重なる状態で配置された電力中継コイルを少なくとも１つ含む第３コイルアレー層と、前記第２コイルアレー層及び前記第３コイルアレー層にそれぞれ含まれる前記電力中継コイルの一部分と重なる状態で配置される電力中継コイルを少なくとも１つ含む第４コイルアレー層と、を更に有する付記１乃至７のいずれかに記載の無線給電装置。
（付記１３）
　前記第１コイルアレー層から前記第４コイルアレー層の４つの層にそれぞれ含まれる前記複数のコイルは、コイル直径をＤとしてコイル中心間間隔ＷがＤ√２＜Ｗ＜２Ｄ の関係を満たすように２次元状に整列配置されていることを特徴とする、付記１２に記載の無線給電装置。
（付記１４）
　前記第２コイルアレー層で整列配置されている前記複数のコイルは、前記第１コイルアレー層で整列配置されている前記複数のコイルに対してコイル中心が第１の方向にＷ／２の距離分ずれて整列配置されており、前記第３コイルアレー層で整列配置されている前記複数のコイルは、前記第１コイルアレー層で整列配置されている前記複数のコイルに対してコイル中心が前記第１の方向に直交する方向にＷ／２の距離分ずれて整列配置されており、前記第４コイルアレー層で整列配置されている前記複数のコイルは、前記第１コイルアレー層で整列配置されている前記複数のコイルに対してコイル中心が前記第１の方向及び前記第１の方向に直交する方向にそれぞれＷ／２ずつずれて整列配置されていることを特徴とする、付記１３に記載の無線給電装置。
（付記１５）
　前記第２コイルアレー層で整列配置されている前記複数のコイルの中で、前記第１コイルアレー層に含まれる前記送電コイルの一部と重なるコイルの両端を短絡して電力中継コイルとし、その他のコイルの両端を開放してオープンコイルとし、前記第３コイルアレー層で整列配置されている前記複数のコイルの中で、前記第１コイルアレー層に含まれる前記送電コイルの一部と重なるコイルの両端を短絡して電力中継コイルとし、その他のコイルの両端を開放してオープンコイルとし、前記第４コイルアレー層で整列配置されている前記複数のコイルの中で、前記第２コイルアレー層又は前記第３コイルアレー層に含まれる前記電力休憩コイルの一部と重なるコイルの両端を短絡して電力中継コイルとし、その他のコイルの両端を開放してオープンコイルすることを特徴とする、付記１４に記載の無線給電装置。
（付記１６）
　前記第２コイルアレー層及び前記第３コイルアレー層が互いに隣接する複数のコイルを含む同一平面の一つの層に置き換わったことを特徴とする付記１５に記載の無線給電装置。
（付記１７）
付記１５または１６記載のオープンコイルが全てリピータコイルに置き換わったことを特徴とする無線給電装置。
（付記１８）
　前記第１コイルアレー層に含まれる複数のコイルの中で、隣り合う２個以上のコイルが送電コイルとなることを特徴とする付記１乃至１７のいずれかに記載の無線給電装置。
（付記１９）
　前記第１コイルアレー層及び第２コイルアレー層に含まれるコイルは、同一の共振周波数を有する同形のコイルである、付記１乃至１８のいずれかに記載の無線給電装置。
（付記２０）
　磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置におけるコイル使用方法であって、複数のコイルが２次元状に周期的に配列された第１コイルアレー層において、少なくとも１つのコイルを発振回路に接続して送電コイルとし、前記第１コイルアレー層に積層する状態で複数のコイルが２次元状に周期的に配列された第２コイルアレー層において、前記送電コイルの一部と重なる状態で積層配置されたコイルの両端を短絡して電力中継コイルとする、コイル使用方法。
（付記２１）
　磁界共鳴方式を用いて送電コイルより無線送電された電力を受電する無線受電装置であって、発振回路に接続される受電コイルを少なくとも１つ含む第１コイルアレー層と、前記受電コイルの一部分と重なる状態で配置された電力中継コイルを少なくとも１つ含む第２コイルアレー層と、を有する無線受電装置。 (Appendix 1)
A wireless power feeding apparatus that supplies power to a power receiving coil using a magnetic field resonance method, and is arranged so as to overlap a first coil array layer including at least one power transmitting coil connected to an oscillation circuit and a part of the power transmitting coil And a second coil array layer including at least one of the relayed power relay coils.
(Appendix 2)
The first coil array layer includes a plurality of coils periodically arranged two-dimensionally, and the second coil array layer is centered with respect to the plurality of coils included in the first coil array layer. It includes a plurality of coils periodically arranged in a two-dimensional manner in a shifted state, and at least one of the plurality of coils included in the first coil array layer is connected to the oscillation circuit to form the power transmission coil The wireless power feeding apparatus according to appendix 1, wherein:
(Appendix 3)
Among the plurality of coils included in the first coil array layer, the coil adjacent to the transmission coil is an open coil whose both ends are open, and among the plurality of coils included in the second coil array layer, The wireless power feeding apparatus according to appendix 2, wherein the coil arranged in a state of being overlapped with a part of the transmission coil is a power relay coil with both ends short-circuited.
(Appendix 4)
Among the plurality of coils included in the first coil array layer, the coil adjacent to the transmission coil is a power relay coil with both ends short-circuited, and among the plurality of coils included in the second coil array layer The coil disposed in a state of being overlapped with a part of the transmission coil or a part of the power relay coil adjacent to the transmission coil is a power relay coil whose both ends are short-circuited. Wireless power feeder.
(Appendix 5)
By switching individually the two ends of a plurality of coils included in the first coil array layer and the second coil array layer, respectively, connected to the oscillation circuit, short-circuited, or opened, The wireless power feeding apparatus according to any one of appendices 2 to 4, further comprising a switching unit that switches between each of the plurality of coils as a transmission coil, a power relay coil, or an open coil.
(Appendix 6)
The plurality of coils included in the first coil array layer are aligned with a gap W between the coil centers, and the plurality of coils included in the second coil array layer include the first coil array layer. The wireless power feeding apparatus according to appendix 5, wherein the plurality of coils arranged in a line are arranged in a line with a gap W between the coil centers without gaps in a state shifted by a distance of W / 2 in the vertical and horizontal directions.
(Appendix 7)
Appendix 6 wherein the relationship between the diameter D of the plurality of coils included in each of the first coil array layer and the second coil array layer and the distance W between the coil centers is D <W <D√2. The wireless power supply arrangement described in 1.
(Appendix 8)
The switching unit switches a coil disposed at a position closest to the power receiving coil among the plurality of coils included in the first coil array layer as a transmission coil and other coils as an open coil. The coil arranged in a state overlapping with a part of the power transmission coil among the plurality of coils included in the second coil array layer is switched to a power relay coil, and the other coil is switched to an open coil. The wireless power feeder according to 5 to 7.
(Appendix 9)
The switching unit is configured to switch a coil disposed at a position closest to the power receiving coil among the plurality of coils included in the first coil array layer as a transmitting coil and another coil as a power relay coil. The wireless power feeding apparatus according to any one of appendices 5 to 7, wherein switching is performed so that the plurality of coils included in the second coil array layer are power relay coils.
(Appendix 10)
The radio according to any one of appendices 1 to 7, further comprising a third coil array layer including at least one power relay coil arranged to overlap a part of the power relay coil included in the second coil array layer. Power supply device.
(Appendix 11)
The wireless power feeding apparatus according to appendix 8, wherein the power relay coil included in the third coil array layer does not overlap the power transmission coil included in the first coil array layer.
(Appendix 12)
A third coil array layer including at least one power relay coil arranged to overlap a part of the power transmission coil, and a part of the power relay coil included in each of the second coil array layer and the third coil array layer; The wireless power feeder according to any one of appendices 1 to 7, further comprising: a fourth coil array layer including at least one power relay coil arranged so as to overlap with the power relay coil.
(Appendix 13)
The plurality of coils included in each of the four layers from the first coil array layer to the fourth coil array layer satisfy a relationship of a coil diameter D and a coil center interval W of D√2 <W <2D. The wireless power feeder according to appendix 12, wherein the wireless power feeder is arranged in a two-dimensional manner.
(Appendix 14)
The plurality of coils arranged in alignment in the second coil array layer have a coil center distance W / 2 in the first direction with respect to the plurality of coils arranged in alignment in the first coil array layer. The plurality of coils that are arranged in an offset manner and arranged in the third coil array layer have a coil center that is aligned with the plurality of coils that are arranged in alignment in the first coil array layer. The plurality of coils that are arranged in the direction perpendicular to the first direction by a distance of W / 2 and arranged in the fourth coil array layer are arranged in the first coil array layer. Appendix 13 is characterized in that the coil centers are aligned and shifted by W / 2 in the first direction and in the direction orthogonal to the first direction with respect to the plurality of coils. Described Line power supply device.
(Appendix 15)
Among the plurality of coils arranged in alignment in the second coil array layer, both ends of the coil that overlaps a part of the power transmission coil included in the first coil array layer are short-circuited to form a power relay coil, and others Coil that overlaps with a part of the power transmission coil included in the first coil array layer among the plurality of coils arranged in the third coil array layer by opening both ends of the coil. The second coil array layer is the second coil array layer among the plurality of coils arranged in alignment with the fourth coil array layer. Alternatively, both ends of the coil that overlaps a part of the power break coil included in the third coil array layer are short-circuited to form a power relay coil, and both ends of the other coils are opened and turned off. Characterized by Punkoiru, the wireless power supply device according to Appendix 14.
(Appendix 16)
The wireless power feeding apparatus according to appendix 15, wherein the second coil array layer and the third coil array layer are replaced with one layer on the same plane including a plurality of adjacent coils.
(Appendix 17)
A wireless power feeding apparatus, wherein all of the open coils described in appendix 15 or 16 are replaced with repeater coils.
(Appendix 18)
The wireless power feeder according to any one of appendices 1 to 17, wherein among the plurality of coils included in the first coil array layer, two or more adjacent coils serve as a power transmission coil.
(Appendix 19)
The wireless power feeding device according to any one of appendices 1 to 18, wherein the coils included in the first coil array layer and the second coil array layer are identical coils having the same resonance frequency.
(Appendix 20)
A method of using a coil in a wireless power feeding apparatus that supplies power to a power receiving coil using a magnetic field resonance method, wherein a plurality of coils are periodically arranged in a two-dimensional manner, and at least one coil is In the second coil array layer in which a plurality of coils are periodically arranged in a two-dimensional manner in a state of being stacked on the first coil array layer in a state of being connected to the oscillation circuit to be a power transmission coil, it overlaps with a part of the power transmission coil. The coil usage method which short-circuits the both ends of the coil laminated | stacked by the state, and makes it a power relay coil.
(Appendix 21)
A wireless power receiving apparatus that receives power wirelessly transmitted from a power transmission coil using a magnetic field resonance method, the first coil array layer including at least one power receiving coil connected to an oscillation circuit, and a part of the power receiving coil A wireless power receiving apparatus comprising: a second coil array layer including at least one power relay coil arranged in an overlapping state.
　この出願は、２０１１年１０月３１日に出願された日本出願特願２０１１－２３９２６５を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority based on Japanese Patent Application No. 2011-239265 filed on Oct. 31, 2011, the entire disclosure of which is incorporated herein.
１０　コイルユニット　　　　　　　　　　　　
１１　コイル
１２　機能切換部　　　　　　　　　　　　　　
１３　発振回路
１４　スイッチ
１００　　無線給電装置　　　　　　　　　　　　
１１０　送電コイル
１２０　　電力中継コイル（リピータコイル）　　
１３０　オープンコイル
１４０　受電コイル　　　　　　　　　　　　
６００　無線受電装置 10 Coil unit
11 Coil 12 Function switching part
13 Oscillation circuit 14 Switch 100 Wireless power feeding device
110 Power transmission coil 120 Power relay coil (repeater coil)
130 Open coil 140 Power receiving coil
600 Wireless power receiver

Claims (10)

  1. 　磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置であって、
    　発振回路に接続される送電コイルを少なくとも１つ含む第１コイルアレー層と、
    　前記送電コイルに跨る状態で配置された電力中継コイルを少なくとも１つ含む第２コイルアレー層と、
    　を有する無線給電装置。     A wireless power feeder that supplies power to a power receiving coil using a magnetic field resonance method,
    A first coil array layer including at least one power transmission coil connected to the oscillation circuit;
    A second coil array layer including at least one power relay coil disposed across the power transmission coil;
    A wireless power supply apparatus having
  2. 　前記第１コイルアレー層は、２次元状に周期的に配列された複数のコイルを含み、
    　前記第２コイルアレー層は、前記第１コイルアレー層に含まれる前記複数のコイルに対してコイル中心がずれた状態で２次元状に周期的に配列された複数のコイルを含み、
    　前記第１コイルアレー層に含まれる複数のコイルの中の少なくとも一つが前記発振回路に接続されて前記送電コイルとなることを特徴とする、
    請求項１に記載の無線給電装置。     The first coil array layer includes a plurality of coils periodically arranged two-dimensionally,
    The second coil array layer includes a plurality of coils periodically arranged in a two-dimensional manner with a coil center shifted with respect to the plurality of coils included in the first coil array layer,
    At least one of a plurality of coils included in the first coil array layer is connected to the oscillation circuit to become the power transmission coil,
    The wireless power feeder according to claim 1.
  3. 　前記第１コイルアレー層に含まれる複数のコイルの中で、前記送電コイルに隣接するコイルは両端が開放されたオープンコイルであり、
    　前記第２コイルアレー層に含まれる複数のコイルの中で、前記送電コイルに跨る状態で配置されているコイルは両端が短絡された電力中継コイルであることを特徴とする、
    　請求項２に記載の無線給電装置。     Among the plurality of coils included in the first coil array layer, the coil adjacent to the power transmission coil is an open coil whose both ends are open,
    Among the plurality of coils included in the second coil array layer, the coil arranged in a state straddling the power transmission coil is a power relay coil in which both ends are short-circuited,
    The wireless power feeder according to claim 2.
  4. 　前記第１コイルアレー層に含まれる複数のコイルの中で、前記送電コイルに隣接するコイルは両端が短絡された電力中継コイルであり、
    　前記第２コイルアレー層に含まれる複数のコイルの中で、前記送電コイル又は前記送電コイルに隣接する前記電力中継コイルのいずれかに跨る状態で配置されているコイルは両端が短絡された電力中継コイルであることを特徴とする、
    　請求項２に記載の無線給電装置。     Among the plurality of coils included in the first coil array layer, the coil adjacent to the power transmission coil is a power relay coil with both ends short-circuited,
    Among the plurality of coils included in the second coil array layer, the coil arranged in a state straddling either the power transmission coil or the power relay coil adjacent to the power transmission coil is a power relay in which both ends are short-circuited It is a coil,
    The wireless power feeder according to claim 2.
  5. 　前記第１コイルアレー層及び前記第２コイルアレー層にそれぞれ含まれる複数のコイルの両端を、前記発振回路に接続するか、又は短絡するか、又は開放するか、を個別に切り換えることで、前記複数のコイルの各々を前記送電コイルとするか、又は前記電力中継コイルとするか、又は前記オープンコイルとするか、を切り換える切り換え部を更に備える、
    請求項２乃至４のいずれか１項に記載の無線給電装置。     By switching individually the two ends of a plurality of coils included in the first coil array layer and the second coil array layer, respectively, connected to the oscillation circuit, short-circuited, or opened, A switching unit that switches between each of the plurality of coils as the power transmission coil, the power relay coil, or the open coil;
    The wireless power feeder according to any one of claims 2 to 4.
  6. 　前記第１コイルアレー層に含まれる前記複数のコイルは、コイル中心間間隔Ｗで隙間なく整列配置されており、
    　前記第２コイルアレー層に含まれる前記複数のコイルは、前記第１コイルアレー層で整列配置されている前記複数のコイルに対して縦方向及び横方向にそれぞれＷ／２の距離分コイル中心をずらした状態でコイル中心間間隔Ｗで隙間なく整列配置されている、
    　請求項５に記載の無線給電装置。     The plurality of coils included in the first coil array layer are arranged in an aligned manner with a gap W between the coil centers,
    The plurality of coils included in the second coil array layer have a coil center by a distance of W / 2 in a longitudinal direction and a lateral direction with respect to the plurality of coils arranged in alignment in the first coil array layer. Arranged without gaps in the center W of the coil center in a shifted state,
    The wireless power feeder according to claim 5.
  7. 　前記切り換え部は、前記第１コイルアレー層に含まれる前記複数のコイルの中で、受電コイルに最も近い位置に配置されているコイルを送電コイルとし、その他のコイルをオープンコイルとする切り換えを行い、前記第２コイルアレー層に含まれる前記複数のコイルの中で、前記送電コイルに跨る状態で配置されたコイルを電力中継コイルとし、その他のコイルをオープンコイルとする切り換えを行う、
    　請求項５又は６に記載の無線給電装置。     The switching unit performs switching so that, among the plurality of coils included in the first coil array layer, a coil disposed at a position closest to the power receiving coil is a power transmission coil, and the other coils are open coils. In the plurality of coils included in the second coil array layer, a coil arranged in a state straddling the power transmission coil is set as a power relay coil, and other coils are switched as open coils.
    The wireless power feeder according to claim 5 or 6.
  8. 　　前記第２コイルアレー層に含まれる前記電力中継コイルの一部分と跨る状態で配置される電力中継コイルを少なくとも１つ含む第３コイルアレー層を更に有する、
    　請求項１乃至７のいずれか１項に記載の無線給電装置。     A third coil array layer including at least one power relay coil disposed in a state straddling a part of the power relay coil included in the second coil array layer;
    The wireless power feeder according to claim 1.
  9. 　前記第３コイルアレー層に含まれる前記電力中継コイルは、前記第１コイルアレー層に含まれる前記送電コイルに跨らないことを特徴とする、
    請求項８に記載の無線給電装置。     The power relay coil included in the third coil array layer does not straddle the power transmission coil included in the first coil array layer.
    The wireless power feeder according to claim 8.
  10. 　磁界共鳴方式を用いて受電コイルに電力を供給する無線給電装置におけるコイル使用方法であって、
    　複数のコイルが２次元状に周期的に配列された第１コイルアレー層において、少なくとも１つのコイルを発振回路に接続して送電コイルとし、
    　前記第１コイルアレー層に積層する状態で複数のコイルが２次元状に周期的に配列された第２コイルアレー層において、前記送電コイルに跨る状態で積層配置されたコイルの両端を短絡して電力中継コイルとする、
    　コイル使用方法。     A method of using a coil in a wireless power feeder that supplies power to a receiving coil using a magnetic field resonance method,
    In the first coil array layer in which a plurality of coils are periodically arranged in a two-dimensional manner, at least one coil is connected to an oscillation circuit as a power transmission coil,
    In a second coil array layer in which a plurality of coils are periodically arranged in a two-dimensional manner in a state of being laminated on the first coil array layer, both ends of the coils arranged in a layer straddling the power transmission coil are short-circuited. Power relay coil
    How to use the coil.
PCT/JP2012/006900 2011-10-31 2012-10-26 Wireless power supply device and coil usage method WO2013065277A1 (en)

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