WO2017086083A1 - Antenna device for power transmission, electronic device and power transmission system - Google Patents

Antenna device for power transmission, electronic device and power transmission system Download PDF

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Publication number
WO2017086083A1
WO2017086083A1 PCT/JP2016/081035 JP2016081035W WO2017086083A1 WO 2017086083 A1 WO2017086083 A1 WO 2017086083A1 JP 2016081035 W JP2016081035 W JP 2016081035W WO 2017086083 A1 WO2017086083 A1 WO 2017086083A1
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WO
WIPO (PCT)
Prior art keywords
coil
power transmission
coupling
coupling portion
power
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Application number
PCT/JP2016/081035
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French (fr)
Japanese (ja)
Inventor
山口佐利
市川敬一
Original Assignee
株式会社村田製作所
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Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2017551784A priority Critical patent/JP6544441B2/en
Publication of WO2017086083A1 publication Critical patent/WO2017086083A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • 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
    • 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

Definitions

  • the present invention relates to a system for transmitting power wirelessly, and more particularly, to a power transmission antenna device used in the system, an electric device including the antenna device, and a power transmission system including a power transmission device and a power receiving device.
  • Patent Document 1 that is an example of a wireless power transmission system (Wireless Power Transfer: WPT) discloses a magnetic field type power transmission system.
  • a relay LC resonance circuit including another inductor (coil) is provided between a power transmission coil and a power reception coil, so that power can be supplied to a more distant place.
  • the coupling coefficient between the power transmission coil and the power reception coil greatly affects the transmission efficiency of active power. Therefore, simply disposing another coil between the power transmission coil and the power reception coil may not allow efficient power transmission from the power transmission device having the power transmission coil to the power reception device having the power reception coil.
  • An object of the present invention is to provide a power transmission antenna device capable of efficiently transmitting power wirelessly, an electric device including the power transmission antenna device, and a power transmission system.
  • An antenna device for power transmission includes: A first coil to which a power transmission circuit or a power reception circuit of a wireless power transmission system is connected; A first coupling portion having a coiled conductor coupled to the first coil; A second coupling portion coupled to the second coil of the counterpart device and having a coiled conductor larger than the first coupling portion; A coil antenna having a connection portion connecting the first coupling portion and the second coupling portion; The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
  • the coupling coefficient between the first coil (the power transmission coil when the own apparatus is a power transmission apparatus, the power reception coil when the own apparatus is a power reception apparatus) and the first coupling unit and the second coil can also be increased. As a result, power transmission efficiency can be increased.
  • the first coupling portion overlaps with the coil opening of the second coupling portion, and the circulation direction of the current flowing through the first coupling portion and the second coupling portion
  • the first coupling portion and the second coupling portion are connected by the connection portion so that the circulation directions of the currents flowing through the first and second coupling portions are opposite to each other.
  • the magnetic flux generated by the current flowing through the first coupling portion and the magnetic flux generated by the current flowing through the second coupling portion in the vicinity of the connection portion connecting the first coupling portion and the second coupling portion are not offset. Therefore, the effective coil opening of the second coupling portion that contributes to the coupling with the second coil (coil antenna of the counterpart device) can be increased, and the coupling coefficient between the second coupling portion and the second coil can be increased.
  • the position of the first coupling portion is different from the position of the connection portion in the coil winding axis direction of the first coupling portion. That is, the first coupling portion and the connection portion are not on the same plane, and the first coupling portion and the connection portion are three-dimensionally formed.
  • the connecting portion becomes acute, the effective coil opening of the second coupling portion can be increased, and three-dimensionally, the connection portion between the first coupling portion and the second coupling portion.
  • the sharp bending of the connecting portion is eliminated, and disconnection of the connecting portion can be prevented.
  • the first coupling part in the plan view of the coil opening of the first coupling part, is disposed outside the coil opening of the second coupling part, and the current flows through the first coupling part.
  • the first coupling portion and the second coupling portion may be connected by the connection portion so that the circulation direction of the current and the circulation direction of the current flowing through the second coupling portion are opposite to each other.
  • the magnetic flux generated by the current flowing through the first coupling portion and the magnetic flux generated by the current flowing through the second coupling portion in the vicinity of the connection portion connecting the first coupling portion and the second coupling portion are not canceled out. Therefore, the effective coil opening of the second coupling portion that contributes to the coupling with the second coil (coil antenna of the counterpart device) can be increased, and the coupling coefficient between the second coupling portion and the second coil can be increased.
  • any one of the above (1) to (4) it is preferable that a capacitor connected to the first coil is provided. As a result, even if the coupling between the first coil and the first coupling portion and the coupling between the second coil and the second coupling portion are reduced, high-efficiency power transmission can be performed with a low driving voltage.
  • any one of (1) to (5) it is preferable that a capacitor connected to the first coupling portion is provided. As a result, even if the coupling between the first coil and the first coupling portion and the coupling between the second coil and the second coupling portion are reduced, high-efficiency power transmission can be performed with a low driving voltage.
  • any one of (1) to (6) it is preferable that a capacitor connected to the second coupling portion is provided. As a result, even if the coupling between the first coil and the first coupling portion and the coupling between the second coil and the second coupling portion are reduced, high-efficiency power transmission can be performed with a low driving voltage.
  • the electronic device of the present invention A power transmission circuit or a power reception circuit, and a power transmission antenna device to which the power transmission circuit or the power reception circuit is connected,
  • the power transmission antenna device includes: A first coil to which the power transmission circuit or the power reception circuit is connected; A first coupling part having a coiled conductor coupled to the first coil, a second coupling part coupled to the second coil of the counterpart device and having a coiled conductor having a larger formation area than the first coupling part; A coil antenna having a connection portion connecting the first coupling portion and the second coupling portion; The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
  • the above configuration constitutes an electronic device with high power transmission efficiency.
  • the power transmission system of the present invention includes: Including a power transmission device and a power reception device,
  • the power receiving device includes a power receiving circuit and a power transmission antenna device connected to the power receiving device.
  • the power transmission device includes a power transmission circuit and a second coil connected to the power transmission circuit,
  • the power transmission antenna device includes: A first coil to which the power receiving circuit is connected; A first coupling portion having a coiled conductor coupled to the first coil; a second coupling portion coupled to the second coil and having a coiled conductor having a larger formation area than the first coupling portion;
  • a coil antenna having a connecting portion for connecting the first connecting portion and the second connecting portion; The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
  • the above configuration constitutes a wireless power transmission system with high power transmission efficiency.
  • the power transmission system of the present invention includes: Including a power transmission device and a power reception device,
  • the power receiving device includes a power receiving circuit and a second coil connected to the power receiving circuit.
  • the power transmission device includes a power transmission circuit and a power transmission antenna device connected to the power transmission device.
  • the power transmission antenna device includes: A first coil to which the power transmission circuit is connected; A first coupling portion having a coiled conductor coupled to the first coil; a second coupling portion coupled to the second coil and having a coiled conductor having a larger formation area than the first coupling portion; A coil antenna having a connecting portion for connecting the first connecting portion and the second connecting portion; The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
  • the above configuration constitutes a wireless power transmission system with high power transmission efficiency.
  • a power transmission antenna device capable of efficiently transmitting power wirelessly, an electric device including the power transmission antenna device, and a power transmission system.
  • FIG. 1 is a diagram illustrating a configuration of a power transmission antenna device 101 and a power transmission system 201 according to the first embodiment.
  • FIG. 2 is a circuit diagram of the power transmission system 201.
  • FIG. 3 is a circuit diagram of the power transmission system 201 and shows the coil polarity.
  • FIG. 4A is a diagram illustrating a connection structure of the first coupling unit 31 and the second coupling unit 32 in the first embodiment
  • FIG. 4B is a first coupling in the power transmission antenna device of the comparative example.
  • FIG. 4 is a diagram showing a connection structure between a part 31 and a second coupling part 32.
  • FIG. 5 is a plan view of the antenna device 101 for power transmission.
  • FIG. 6A and 6B are views in which the power transmission antenna device 101 in the XY plane in FIG. 5 is viewed from the predetermined height on the Z axis in the Y axis direction.
  • 7A and 7B are views of the HH portion in FIG.
  • FIG. 8 is a diagram illustrating a configuration of the power transmission antenna device 102 and the power transmission system 202 according to the second embodiment.
  • FIG. 9 is a diagram illustrating a connection structure of the first coupling portion 31 and the second coupling portion 32 in the second embodiment.
  • FIG. 10 is a diagram illustrating a configuration of the power transmission antenna device 103 according to the third embodiment.
  • FIG. 11 is a diagram illustrating a configuration of a power transmission antenna device 104 and a power transmission system including the power transmission antenna device 104 according to the fourth embodiment.
  • FIG. 1 is a diagram illustrating a configuration of a power transmission antenna device and a power transmission system according to the first embodiment.
  • the power transmission system 201 includes a power receiving device 111 and a power transmitting device 121.
  • the power transmission device 121 includes a mounting table on which the power reception device 111 is mounted, and power transmission is performed in a state where the power reception device 111 is mounted on the mounting table of the power transmission device 121.
  • FIG. 1 is a schematic plan view in a state where the power receiving device 111 is mounted on the mounting table of the power transmitting device 121.
  • the power receiving device 111 includes a power transmission antenna device 101 and a power receiving circuit 10.
  • the power transmission device 121 includes a second coil 21 for power transmission and a power transmission circuit 20.
  • the power transmission antenna device 101 includes the first coil 11, the first coupling unit 31, the second coupling unit 32, and the connection unit 4 that connects the first coupling unit 31 and the second coupling unit 32.
  • the first coil 11 is a multi-turn or one-turn coil, and both ends thereof are connected to the power receiving circuit 10.
  • the first coupling portion 31 is a coil-shaped conductor having approximately one turn.
  • the first coupling portion 31 has substantially the same diameter as the first coil 11, and the coil opening surrounded by the coiled conductor of the first coupling portion 31 and the coil opening of the first coil 11 overlap. Further, the first coupling portion 31 is disposed concentrically with the first coil 11. That is, when the coil opening of the first coil 11 and the first coupling portion 31 is viewed in plan, the formation region of the first coil 11 (the coil conductor and the coil opening of the first coil 11) and the formation region of the first coupling portion 31 ( It overlaps with the coiled conductor and coil opening of the first coupling portion 31. Therefore, the first coil 11 and the first coupling portion 31 are magnetically coupled with a high coupling coefficient.
  • the second coupling part 32 has a coiled conductor larger than that of the first coupling part 31, and in this example, is a coiled conductor of almost one turn.
  • the second coupling unit 32 is magnetically coupled to the second coil 21 of the power transmission device 121.
  • the first coupling unit 31 and the second coupling unit 32 are connected via the connection unit 4.
  • the second coil 21 of the power transmission device 121 is a multi-turn coil in this example, and both ends thereof are connected to the power transmission circuit 20.
  • the second coil 21 is provided in the mounting table of the power transmission device 121.
  • the formation region of the second coil 21 including the coil conductor and the coil opening of the second coil 21 is larger than the formation region of the second coupling portion 32 of the power receiving device 111. That is, the coil opening of the second coil 21 is larger than the coil opening of the second coupling portion 32 of the power receiving device 111.
  • the second coupling part 32 enters the formation region of the second coil 21 in a state in which the power receiving device 111 is placed on the mounting table above the power transmitting device 121.
  • FIG. 2 is a circuit diagram of the power transmission system 201. As shown in FIG. 2, the first coil 11 and the first coupling portion 31 are magnetically coupled, and the second coupling portion 32 and the second coil 21 are magnetically coupled. The first coil 11 and the second coil 21 are directly magnetically coupled.
  • the power transmission circuit 20 energizes the second coil 21 with a high frequency current in the HF band such as 6.78 MHz (the lowest ISM band). As a result, a high frequency current is induced in the second coupling portion 32 and the first coupling portion 31. A high frequency current is induced in the first coil 11 by magnetic field coupling between the first coupling portion 31 and the first coil 11. A high frequency current is also induced in the first coil 11 by magnetic field coupling between the second coil 21 and the first coil 11.
  • the power receiving circuit 10 is provided with a rectifying / smoothing circuit and a DC-DC converter.
  • the high-frequency current induced in the first coil 11 is rectified and smoothed by the rectifying and smoothing circuit, and converted to a predetermined DC voltage by the DC-DC converter.
  • the first coil 11 and the first coupling portion 31 have concentric and substantially the same diameter of the coil openings, so that the coupling coefficient of both is the first coil 11 and the second coupling portion. Higher than 32 coupling coefficients.
  • the second coil 21 and the second coupling portion 32 have the same winding axis direction of the coil conductor of the first coil 11 and the winding axis direction of the coiled conductor of the first coupling portion 31. Since the ratio of the region where the formation region of 21 and the formation region of the second coupling portion 32 overlap each other is large, the coupling coefficient of both is higher than the coupling coefficient of the second coil 21 and the first coupling portion 31.
  • the coupling coefficient of both is the second coil 21 and the first coupling part 31. Higher than the coupling coefficient.
  • the first coil 11 is strongly coupled to the second coil 21 via the first coupling portion 31 and the second coupling portion 32.
  • FIG. 3 is a circuit diagram of the power transmission system 201, and shows the coil polarity with black circles.
  • the second coil 21 and the second coupling part 32, the first coil 11 and the second coil 21 have the same polarity, and the first coil 11 and the first coupling part 31 have the opposite polarity.
  • the direct magnetic field coupling between the first coil 11 and the second coil 21 enhances the coupling between the first coil 11 and the first coupling portion 31. Works. As a result, the coupling between the first coil 11 and the second coil 21 can be strengthened.
  • FIG. 4A is a diagram illustrating a connection structure of the first coupling portion 31 and the second coupling portion 32 in the present embodiment
  • FIG. 4B is a diagram illustrating the first coupling portion 31 in the power transmission antenna device of the comparative example.
  • FIG. 6 is a view showing a connection structure of the second coupling portion 32.
  • the first coupling unit 31 and the first coupling unit 31 and the first coupling unit 31 are arranged such that the circulation direction of the current flowing through the first coupling unit 31 and the circulation direction of the current flowing through the second coupling unit 32 are opposite to each other. Since the two coupling portions 32 are connected, the magnetic flux generated by the current flowing through the first coupling portion 31 in the vicinity of the connection portion connecting the first coupling portion 31 and the second coupling portion 32 and the second coupling portion. The magnetic flux generated by the current flowing through 32 is not canceled out. For this reason, it is possible to suppress the bias of the magnetic field generated around the coil conductor of the second coupling portion 32 as much as possible.
  • FIGS. 5, 6 ⁇ / b> A, 6 ⁇ / b> B, and 7 ⁇ / b> A, 7 ⁇ / b> B are diagrams illustrating the configuration of the connection unit 4.
  • 5 is a plan view of the power transmission antenna device 101
  • FIGS. 6A and 6B are views of the power transmission antenna device 101 in the XY plane in FIG. It is the figure which looked down at the direction.
  • 7A and 7B are views of the HH portion in FIG.
  • the power transmission antenna device shown in FIGS. 6 (A) and 7 (A) and the other power transmission antenna device shown in FIGS. 6 (B) and 7 (B) are both coil-wound in the first coupling portion 31.
  • the position of the first coupling portion 31 (the height in the Z-axis direction) is different from the position of the connection portion 4 (the height in the Z-axis direction).
  • the height of the first coupling portion 31 in the Z-axis direction is different from the height of the second coupling portion 32 in the Z-axis direction.
  • the first coil 11 is substantially at the same height as the first coupling portion 31.
  • the height of the first coupling portion 31 in the Z-axis direction and the height of the second coupling portion 32 in the Z-axis direction are substantially equal.
  • the first coil 11 is substantially at the same height as the first coupling portion 31 and the second coupling portion 32.
  • the position of the connecting portion (the height in the Z-axis direction) in the coil winding axis direction of the first coupling portion 31 is different from the position of the first coupling portion 31, so that there is no acute bending of the connecting portion 4.
  • disconnection of the connecting portion can be prevented.
  • the connection portion between the first coupling portion 31 and the second coupling portion 32 becomes acute, and the effective coil opening of the second coupling portion can be increased.
  • the first coupling part 31, the second coupling part 32, and the connection part 4 can be configured by a series of conductive wires such as Cu coated with insulation instead of the conductor pattern on the substrate, the first coupling part 31, The direct current resistance of the second coupling portion 32 and the connection portion 4 can be reduced, and as a result, an increase in loss due to the provision of the first coupling portion 31, the second coupling portion 32, and the connection portion 4 can be suppressed.
  • the first coil 11 and the second coupling portion 32 are separated from each other in the height direction (Z-axis direction). 2 Unnecessary coupling with the coupling portion 32 and the connection portion 4 is suppressed. In the example shown in FIG. 6B and FIG. 7B, the first coil 11 and the connection portion 4 are separated in the height direction (Z-axis direction). Unnecessary binding is suppressed. That is, in any case, cancellation due to unnecessary coupling is suppressed, and the effective coupling coefficient between the first coil 11 and the first coupling portion 31 is high.
  • Second Embodiment an example of a power transmission antenna device in which the shapes of the first coupling portion and the second coupling portion are different from those in the first embodiment is shown.
  • FIG. 8 is a diagram showing a configuration of the power transmission antenna device 102 and the power transmission system 202 according to the second embodiment.
  • the power transmission system 202 includes a power receiving device 112 and a power transmitting device 122.
  • the power receiving device 112 includes a power transmission antenna device 102 and a power receiving circuit 10.
  • the power transmission device 122 includes the second coil 21 for power transmission and the power transmission circuit 20.
  • the power transmission antenna device 102 includes the first coil 11, the first coupling unit 31, the second coupling unit 32, and the connection unit 4 that connects the first coupling unit 31 and the second coupling unit 32.
  • the first coil 11 is a multi-turn or one-turn coil, and both ends thereof are connected to the power receiving circuit 10.
  • the first coupling portion 31 is a coil-shaped conductor having approximately one turn.
  • the first coupling portion 31 has substantially the same diameter as the first coil 11 and is disposed concentrically with the first coil 11. That is, when the coil openings of the first coil 11 and the first coupling portion 31 are viewed in plan, the formation region of the first coil 11 and the formation region of the first coupling portion 31 overlap.
  • the first coupling part 31 is arranged outside the coil opening of the second coupling part 32, and the direction of the current flowing through the first coupling part 31 and the second coupling part 32.
  • the first coupling portion 31 and the second coupling portion 32 are connected by the connection portion 4 so that the circulation directions of the currents flowing through the first and second coupling portions are opposite to each other.
  • the second coupling part 32 has a coiled conductor larger than that of the first coupling part 31, and in this example, is a coiled conductor of almost one turn.
  • the second coupling unit 32 is magnetically coupled to the second coil 21 of the power transmission device 121.
  • the power transmission device 122 includes a mounting table on which the power receiving device 112 is mounted, and the second coil 21 is provided in the mounting table.
  • the coil opening of the second coil 21 is larger than the coil opening of the second coupling portion 32 of the power receiving device 112.
  • the second coupling portion 32 and the first coupling portion 31 enter the opening of the second coil 21 in a state where the power receiving device 112 is placed on the mounting table above the power transmitting device 122.
  • FIG. 9 is a diagram showing a connection structure of the first coupling portion 31 and the second coupling portion 32 in the present embodiment.
  • the magnetic field in the direction represented by the dot symbol and the cross symbol is generated. appear.
  • the direction of the magnetic field generated inside the second coupling unit 32 by the current flowing through the first coupling unit 31 is the same as the direction of the magnetic field generated inside the second coupling unit 32 by the current flowing through the second coupling unit 32 (dot symbol). It is.
  • the current flowing through the first coupling portion 31 and the current flowing through the second coupling portion 32 are not canceled by the coupling with the first coil 11. Therefore, the coupling between the first coil 11 and the first coupling unit 31 and the second coupling unit 32 can be enhanced, and the transmission efficiency is increased.
  • Third Embodiment an example of a power transmission antenna device having a connection structure between the first coupling unit and the second coupling unit is different from that of the second embodiment.
  • FIG. 10 is a diagram showing a configuration of the power transmission antenna device 103 according to the third embodiment.
  • the power transmission antenna device 103 includes the first coil 11, the first coupling unit 31, the second coupling unit 32, and the connection unit 4 that connects the first coupling unit 31 and the second coupling unit 32.
  • the first coil 11 is a multi-turn or one-turn coil, and both ends thereof are connected to the power receiving circuit.
  • the first coupling portion 31 is a coil-shaped conductor having approximately one turn.
  • the first coupling portion 31 has substantially the same diameter as the first coil 11 and is disposed concentrically with the first coil 11. That is, when the coil openings of the first coil 11 and the first coupling portion 31 are viewed in plan, the formation region of the first coil 11 and the formation region of the first coupling portion 31 overlap.
  • the first coupling part 31 is arranged outside the coil opening of the second coupling part 32, and the direction of the current flowing through the first coupling part 31 and the second coupling part 32.
  • the first coupling portion 31 and the second coupling portion 32 are connected by the connection portion 4 so that the direction of circulation of the current flowing through the first and second coupling portions is the same.
  • the second coupling part 32 has a coiled conductor larger than that of the first coupling part 31, and in this example, is a coiled conductor of almost one turn.
  • the second coupling unit 32 is magnetically coupled to the second coil 21 of the power transmission device.
  • the coupling coefficient between the first coil 11 and the first coupling unit 31 and the second coupling unit 32 can be increased.
  • FIG. 11 is a diagram illustrating a configuration of a power transmission antenna device 104 and a power transmission system including the power transmission antenna device 104 according to the fourth embodiment.
  • the power transmission antenna device 104 includes a first coil 11, a first coupling unit 31, a second coupling unit 32, and a connection unit that connects the first coupling unit 31 and the second coupling unit 32.
  • a power receiving circuit 10 is connected to the first coil 11.
  • the power transmission circuit 20 is connected to the second coil 21 of the power transmission device.
  • a resonance capacitor C1 is connected in series to the first coupling portion 31, and a resonance capacitor C2 is connected in series to the second coupling portion 32.
  • the resonance frequency of the LC circuit composed of the first coupling unit 31, the second coupling unit 32, and the resonance capacitors C1 and C2 is the combined inductance of the inductance of the first coupling unit 31 and the inductance of the second coupling unit 32, and It is determined by the capacitance of the resonance capacitor C1 and the combined capacitance of the resonance capacitor C2.
  • the resonance frequency of the combined LC circuit is preferably a frequency used for power transmission (for example, 6.78 MHz) or a frequency in the vicinity thereof.
  • the first coupling unit 31 and the resonance capacitor C1 are regarded as a first LC circuit
  • the second coupling unit 32 and the resonance capacitor C2 are regarded as a second LC circuit.
  • the resonance frequency determined by is preferably the resonance frequency of the synthesized LC circuit or a frequency in the vicinity thereof.
  • the capacitor C10 is connected in parallel to the first coil 11, and the capacitor C20 is connected in parallel to the second coil 21.
  • the resonance frequency of the LC resonance circuit including the first coil 11 and the capacitor C10 and the resonance frequency of the LC resonance circuit including the second coil 21 and the capacitor C20 are both frequencies used for power transmission (for example, 6.78 MHz) or frequencies in the vicinity thereof. It is preferable.
  • the example in which the power receiving circuit 10 is connected to the first coil 11 and the power transmitting circuit 20 is connected to the second coil 21 has been described, but this relationship may be reversed. That is, the first coil 11 may be a power transmission side coil, and the second coil 21 may be a power reception side coil. In that case, a power transmission circuit is connected to the first coil 11, a power transmission device is configured by the first coil 11 and the power transmission circuit, and a power reception circuit is connected to the second coil 21.
  • the second coil 21 and the power receiving circuit constitute a power receiving device.
  • each of the first coupling portion 31 and the second coupling portion 32 has a substantially one-turn coil shape, but one of the first coupling portion 31 and the second coupling portion 32 has a plurality of turns. It is good also as a coil shape. Moreover, it is good also considering both as a coil shape of multiple turns.
  • shaft was different. Also good.
  • the formation regions (preferably the respective coil openings) of the first coil 11 and the first coupling portion 31 may overlap.
  • the winding axis directions of the coil conductor of the first coil 11 and the coiled conductor of the first coupling portion 31 are the same, but the winding axis directions may be at an angle to each other. The angle formed by each winding axis is preferably within 45 degrees.
  • the coil opening of the first coil 11 and the coil opening of the first coupling portion 31 have substantially the same shape, but may be different. Since the coupling coefficient increases as the coil openings are the same, the area of one coil opening is preferably less than twice the area of the other coil opening.
  • bond part 31 are the coil conductors each formed in circular shape, polygons, such as an ellipse and a rectangle, Other shapes may be used. However, if the coil conductor is circular, even when the coil conductor is rotated with respect to each winding axis, the change in characteristics due to the difference in the rotated angle is small.
  • a magnetic material may be disposed to enhance the coupling between the first coil 11 and the first coupling portion 31 or to enhance the coupling between the second coil 21 and the second coupling portion 32.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

This antenna device (101) for power transmission comprises: a first coil (11) to which a power receiving circuit (10) is connected; a first coupling part (31) having a coil conductor that is coupled with the first coil (11); a second coupling part (32) which is coupled with a second coil (21) of a counterpart device and has a coil conductor that is larger than the coil conductor of the first coupling part (31); and a connection part (4) which connects the first coupling part (31) and the second coupling part (32) with each other. The formation area of the first coil (11) and the formation area of the first coupling part (31) overlap each other in the coil openings of the first coil (11) and the first coupling part (31) when viewed in plan.

Description

電力伝送用アンテナ装置、電子機器および電力伝送システムAntenna device for power transmission, electronic device and power transmission system
　本発明は、ワイヤレスで電力を伝送するシステムに関し、特に、そのシステムに用いられる電力伝送用アンテナ装置、それを備える電気機器、および電力伝送装置と電力受電装置とで構成される電力伝送システムに関する。 The present invention relates to a system for transmitting power wirelessly, and more particularly, to a power transmission antenna device used in the system, an electric device including the antenna device, and a power transmission system including a power transmission device and a power receiving device.
　ワイヤレス電力伝送システム（Wireless Power Transfer : WPT）の一例と言える特許文献１には、磁界型の電力伝送システムが開示されている。また、この特許文献１には、送電コイルと受電コイルとの間に別のインダクタ（コイル）を含んだ中継用のＬＣ共振回路を設け、より離れた場所への電力供給が可能としている。 Patent Document 1 that is an example of a wireless power transmission system (Wireless Power Transfer: WPT) discloses a magnetic field type power transmission system. In Patent Document 1, a relay LC resonance circuit including another inductor (coil) is provided between a power transmission coil and a power reception coil, so that power can be supplied to a more distant place.
国際公開第２０１３／１３３０２８号International Publication No. 2013/133028
　送電コイルと受電コイルとを磁界結合させて、すなわち磁界エネルギーを介して、電力を伝送する場合、送電コイルと受電コイルとの結合係数は、有効電力の伝送効率に大きな影響を与える。そのため、送電コイルと受電コイルとの間に、単に別のコイルを配置しただけでは、送電コイルを有する送電装置から受電コイルを有する受電装置へ効率よく電力伝送できない場合がある。 When the power transmission coil and the power reception coil are magnetically coupled, that is, when electric power is transmitted via magnetic field energy, the coupling coefficient between the power transmission coil and the power reception coil greatly affects the transmission efficiency of active power. Therefore, simply disposing another coil between the power transmission coil and the power reception coil may not allow efficient power transmission from the power transmission device having the power transmission coil to the power reception device having the power reception coil.
　本発明の目的は、ワイヤレスで効率よく電力伝送できる電力伝送用アンテナ装置、それを備える電気機器および電力伝送システムを提供することにある。 An object of the present invention is to provide a power transmission antenna device capable of efficiently transmitting power wirelessly, an electric device including the power transmission antenna device, and a power transmission system.
（１）本発明の電力伝送用アンテナ装置は、
　ワイヤレス電力伝送システムの電力送電回路または電力受電回路が接続される第１コイルと、
　前記第１コイルと結合するコイル状導体を有する第１結合部と、
　相手装置の第２コイルと結合し、前記第１結合部よりも大きいコイル状導体を有する第２結合部と、
　前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１コイルおよび前記第１結合部のコイル開口の平面視で重なる。 (1) An antenna device for power transmission according to the present invention includes:
A first coil to which a power transmission circuit or a power reception circuit of a wireless power transmission system is connected;
A first coupling portion having a coiled conductor coupled to the first coil;
A second coupling portion coupled to the second coil of the counterpart device and having a coiled conductor larger than the first coupling portion;
A coil antenna having a connection portion connecting the first coupling portion and the second coupling portion;
The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
　上記構成により、第１コイル（自装置が送電装置である場合は送電コイル、自装置が受電装置である場合には受電コイル）と第１結合部との結合係数を高めるとともに、第２コイル（相手装置が受電装置である場合は受電コイル、相手装置が送電装置である場合には送電コイル）と第２結合部との結合係数も高めることができる。そのことにより、電力伝送効率を高めることができる。 With the above configuration, the coupling coefficient between the first coil (the power transmission coil when the own apparatus is a power transmission apparatus, the power reception coil when the own apparatus is a power reception apparatus) and the first coupling unit and the second coil ( The coupling coefficient between the power receiving coil when the counterpart device is a power receiving device and the power transmission coil when the counterpart device is a power transmitting device and the second coupling unit can also be increased. As a result, power transmission efficiency can be increased.
（２）前記第１結合部のコイル開口の平面視で、前記第１結合部は前記第２結合部のコイル開口と重なり、前記第１結合部に流れる電流の周回方向と前記第２結合部に流れる電流の周回方向とが互いに逆となるように、前記第１結合部と前記第２結合部とは前記接続部で接続されていることが好ましい。これにより、第１結合部と第２結合部とを接続する接続部付近での、第１結合部に流れる電流によって生じる磁束と第２結合部に流れる電流によって生じる磁束とが相殺されない。そのため、第２コイル（相手装置のコイルアンテナ）との結合に寄与する、第２結合部の実効的なコイル開口を大きくでき、第２結合部と第２コイルとの結合係数を大きくできる。 (2) In a plan view of the coil opening of the first coupling portion, the first coupling portion overlaps with the coil opening of the second coupling portion, and the circulation direction of the current flowing through the first coupling portion and the second coupling portion It is preferable that the first coupling portion and the second coupling portion are connected by the connection portion so that the circulation directions of the currents flowing through the first and second coupling portions are opposite to each other. Thereby, the magnetic flux generated by the current flowing through the first coupling portion and the magnetic flux generated by the current flowing through the second coupling portion in the vicinity of the connection portion connecting the first coupling portion and the second coupling portion are not offset. Therefore, the effective coil opening of the second coupling portion that contributes to the coupling with the second coil (coil antenna of the counterpart device) can be increased, and the coupling coefficient between the second coupling portion and the second coil can be increased.
（３）上記（２）において、前記第１結合部のコイル巻回軸方向において、前記第１結合部の位置は前記接続部の位置と異なることが好ましい。すなわち第１結合部と接続部とは同一平面上にはなく、第１結合部と接続部とが立体的に形成される。このことにより、平面視では、接続部は鋭角的となって、第２結合部の実効的なコイル開口を大きくでき、且つ立体的には第１結合部と第２結合部との接続部での鋭角的な折れ曲がりがなくなって、接続部の断線が防止できる。 (3) In the above (2), it is preferable that the position of the first coupling portion is different from the position of the connection portion in the coil winding axis direction of the first coupling portion. That is, the first coupling portion and the connection portion are not on the same plane, and the first coupling portion and the connection portion are three-dimensionally formed. As a result, in plan view, the connecting portion becomes acute, the effective coil opening of the second coupling portion can be increased, and three-dimensionally, the connection portion between the first coupling portion and the second coupling portion. As a result, the sharp bending of the connecting portion is eliminated, and disconnection of the connecting portion can be prevented.
（４）上記（１）において、前記第１結合部のコイル開口の平面視で、前記第１結合部は前記第２結合部のコイル開口の外側に配置され、前記第１結合部に流れる電流の周回方向と前記第２結合部に流れる電流の周回方向とが互いに逆となるように、前記第１結合部と前記第２結合部とは前記接続部で接続されていてもよい。これにより、第１結合部と第２結合部とを接続する接続部付近での、第１結合部に流れる電流によって生じる磁束と第２結合部に流れる電流によって生じる磁束とは相殺されない。そのため、第２コイル（相手装置のコイルアンテナ）との結合に寄与する、第２結合部の実効的なコイル開口を大きくでき、第２結合部と第２コイルとの結合係数を大きくできる。 (4) In the above (1), in the plan view of the coil opening of the first coupling part, the first coupling part is disposed outside the coil opening of the second coupling part, and the current flows through the first coupling part. The first coupling portion and the second coupling portion may be connected by the connection portion so that the circulation direction of the current and the circulation direction of the current flowing through the second coupling portion are opposite to each other. Thereby, the magnetic flux generated by the current flowing through the first coupling portion and the magnetic flux generated by the current flowing through the second coupling portion in the vicinity of the connection portion connecting the first coupling portion and the second coupling portion are not canceled out. Therefore, the effective coil opening of the second coupling portion that contributes to the coupling with the second coil (coil antenna of the counterpart device) can be increased, and the coupling coefficient between the second coupling portion and the second coil can be increased.
（５）上記（１）から（４）のいずれかにおいて、前記第１コイルに接続されるキャパシタを備えることが好ましい。これにより、第１コイルと第１結合部との結合、第２コイルと第２結合部との結合が低下しても、低い駆動電圧で高効率の電力伝送が可能となる。 (5) In any one of the above (1) to (4), it is preferable that a capacitor connected to the first coil is provided. As a result, even if the coupling between the first coil and the first coupling portion and the coupling between the second coil and the second coupling portion are reduced, high-efficiency power transmission can be performed with a low driving voltage.
（６）上記（１）から（５）のいずれかにおいて、前記第１結合部に接続されるキャパシタを備えることが好ましい。これにより、第１コイルと第１結合部との結合、第２コイルと第２結合部との結合が低下しても、低い駆動電圧で高効率の電力伝送が可能となる。 (6) In any one of (1) to (5), it is preferable that a capacitor connected to the first coupling portion is provided. As a result, even if the coupling between the first coil and the first coupling portion and the coupling between the second coil and the second coupling portion are reduced, high-efficiency power transmission can be performed with a low driving voltage.
（７）上記（１）から（６）のいずれかにおいて、前記第２結合部に接続されるキャパシタを備えることが好ましい。これにより、第１コイルと第１結合部との結合、第２コイルと第２結合部との結合が低下しても、低い駆動電圧で高効率の電力伝送が可能となる。 (7) In any one of (1) to (6), it is preferable that a capacitor connected to the second coupling portion is provided. As a result, even if the coupling between the first coil and the first coupling portion and the coupling between the second coil and the second coupling portion are reduced, high-efficiency power transmission can be performed with a low driving voltage.
（８）本発明の電子機器は、
　電力送電回路または電力受電回路と、前記電力送電回路または前記電力受電回路が接続される電力伝送用アンテナ装置とを備え、
　前記電力伝送用アンテナ装置は、
　前記電力送電回路または前記電力受電回路が接続される第１コイルと、
　前記第１コイルと結合するコイル状導体を有する第１結合部と、相手装置の第２コイルと結合し、前記第１結合部よりも形成領域の大きなコイル状導体を有する第２結合部と、前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１コイルおよび前記第１結合部のコイル開口の平面視で重なる。 (8) The electronic device of the present invention
A power transmission circuit or a power reception circuit, and a power transmission antenna device to which the power transmission circuit or the power reception circuit is connected,
The power transmission antenna device includes:
A first coil to which the power transmission circuit or the power reception circuit is connected;
A first coupling part having a coiled conductor coupled to the first coil, a second coupling part coupled to the second coil of the counterpart device and having a coiled conductor having a larger formation area than the first coupling part; A coil antenna having a connection portion connecting the first coupling portion and the second coupling portion;
The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
　上記構成により、電力伝送効率の高い電子機器が構成される。 The above configuration constitutes an electronic device with high power transmission efficiency.
（９）本発明の電力伝送システムは、
　電力送電装置および電力受電装置を含み、
　前記電力受電装置は、電力受電回路と、当該電力受電装置に接続された電力伝送用アンテナ装置とを有し、
　前記電力送電装置は、電力送電回路と、当該電力送電回路に接続された第２コイルとを有し、
　前記電力伝送用アンテナ装置は、
　前記電力受電回路が接続される第１コイルと、
　前記第１コイルと結合するコイル状導体を有する第１結合部と、前記第２コイルと結合し、前記第１結合部よりも形成領域の大きなコイル状導体を有する第２結合部と、前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１コイルおよび前記第１結合部のコイル開口の平面視で重なる。 (9) The power transmission system of the present invention includes:
Including a power transmission device and a power reception device,
The power receiving device includes a power receiving circuit and a power transmission antenna device connected to the power receiving device.
The power transmission device includes a power transmission circuit and a second coil connected to the power transmission circuit,
The power transmission antenna device includes:
A first coil to which the power receiving circuit is connected;
A first coupling portion having a coiled conductor coupled to the first coil; a second coupling portion coupled to the second coil and having a coiled conductor having a larger formation area than the first coupling portion; A coil antenna having a connecting portion for connecting the first connecting portion and the second connecting portion;
The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
　上記構成により、電力伝送効率の高いワイヤレス電力伝送システムが構成される。 The above configuration constitutes a wireless power transmission system with high power transmission efficiency.
（１０）本発明の電力伝送システムは、
　電力送電装置および電力受電装置を含み、
　前記電力受電装置は、電力受電回路と、当該電力受電回路に接続された第２コイルとを有し、
　前記電力送電装置は、電力送電回路と、当該電力送電装置に接続された電力伝送用アンテナ装置とを有し、
　前記電力伝送用アンテナ装置は、
　前記電力送電回路が接続される第１コイルと、
　前記第１コイルと結合するコイル状導体を有する第１結合部と、前記第２コイルと結合し、前記第１結合部よりも形成領域の大きなコイル状導体を有する第２結合部と、前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１コイルおよび前記第１結合部のコイル開口の平面視で重なる。 (10) The power transmission system of the present invention includes:
Including a power transmission device and a power reception device,
The power receiving device includes a power receiving circuit and a second coil connected to the power receiving circuit.
The power transmission device includes a power transmission circuit and a power transmission antenna device connected to the power transmission device.
The power transmission antenna device includes:
A first coil to which the power transmission circuit is connected;
A first coupling portion having a coiled conductor coupled to the first coil; a second coupling portion coupled to the second coil and having a coiled conductor having a larger formation area than the first coupling portion; A coil antenna having a connecting portion for connecting the first connecting portion and the second connecting portion;
The formation area of the first coil and the formation area of the first coupling portion overlap in a plan view of the coil opening of the first coil and the first coupling portion.
　上記構成により、電力伝送効率の高いワイヤレス電力伝送システムが構成される。 The above configuration constitutes a wireless power transmission system with high power transmission efficiency.
　本発明によれば、ワイヤレスで効率よく電力伝送できる電力伝送用アンテナ装置、それを備える電気機器および電力伝送システムが得られる。 According to the present invention, it is possible to obtain a power transmission antenna device capable of efficiently transmitting power wirelessly, an electric device including the power transmission antenna device, and a power transmission system.
図１は第１の実施形態に係る電力伝送用アンテナ装置１０１および電力伝送システム２０１の構成を示す図である。FIG. 1 is a diagram illustrating a configuration of a power transmission antenna device 101 and a power transmission system 201 according to the first embodiment. 図２は電力伝送システム２０１の回路図である。FIG. 2 is a circuit diagram of the power transmission system 201. 図３は電力伝送システム２０１の回路図であり、コイル極性を示す図である。FIG. 3 is a circuit diagram of the power transmission system 201 and shows the coil polarity. 図４（Ａ）は第１の実施形態における第１結合部３１および第２結合部３２の接続構造を示す図であり、図４（Ｂ）は比較例の電力伝送用アンテナ装置における第１結合部３１および第２結合部３２の接続構造を示す図である。FIG. 4A is a diagram illustrating a connection structure of the first coupling unit 31 and the second coupling unit 32 in the first embodiment, and FIG. 4B is a first coupling in the power transmission antenna device of the comparative example. FIG. 4 is a diagram showing a connection structure between a part 31 and a second coupling part 32. 図５は電力伝送用アンテナ装置１０１の平面図である。FIG. 5 is a plan view of the antenna device 101 for power transmission. 図６（Ａ）（Ｂ）は、図５において、Ｘ－Ｙ平面にある電力伝送用アンテナ装置１０１をＺ軸上の所定高さからＹ軸方向に俯瞰した図である。6A and 6B are views in which the power transmission antenna device 101 in the XY plane in FIG. 5 is viewed from the predetermined height on the Z axis in the Y axis direction. 図７（Ａ）（Ｂ）は、図５におけるＨ－Ｈ部分を視た図である。7A and 7B are views of the HH portion in FIG. 図８は第２の実施形態に係る電力伝送用アンテナ装置１０２および電力伝送システム２０２の構成を示す図である。FIG. 8 is a diagram illustrating a configuration of the power transmission antenna device 102 and the power transmission system 202 according to the second embodiment. 図９は第２の実施形態における第１結合部３１および第２結合部３２の接続構造を示す図である。FIG. 9 is a diagram illustrating a connection structure of the first coupling portion 31 and the second coupling portion 32 in the second embodiment. 図１０は第３の実施形態に係る電力伝送用アンテナ装置１０３の構成を示す図である。FIG. 10 is a diagram illustrating a configuration of the power transmission antenna device 103 according to the third embodiment. 図１１は第４の実施形態に係る電力伝送用アンテナ装置１０４およびそれを備える電力伝送システムの構成を示す図である。FIG. 11 is a diagram illustrating a configuration of a power transmission antenna device 104 and a power transmission system including the power transmission antenna device 104 according to the fourth embodiment.
《第１の実施形態》
　図１は第１の実施形態に係る電力伝送用アンテナ装置および電力伝送システムの構成を示す図である。 << First Embodiment >>
FIG. 1 is a diagram illustrating a configuration of a power transmission antenna device and a power transmission system according to the first embodiment.
　この電力伝送システム２０１は、電力受電装置１１１と電力送電装置１２１とで構成される。電力送電装置１２１は電力受電装置１１１が載置される載置台を備え、この電力送電装置１２１の載置台に電力受電装置１１１が載置された状態で電力伝送が行われる。図１は、電力送電装置１２１の載置台に電力受電装置１１１が載置された状態での概略平面図である。 The power transmission system 201 includes a power receiving device 111 and a power transmitting device 121. The power transmission device 121 includes a mounting table on which the power reception device 111 is mounted, and power transmission is performed in a state where the power reception device 111 is mounted on the mounting table of the power transmission device 121. FIG. 1 is a schematic plan view in a state where the power receiving device 111 is mounted on the mounting table of the power transmitting device 121.
　電力受電装置１１１は、電力伝送用アンテナ装置１０１と電力受電回路１０とを備える。また、電力送電装置１２１は、電力送電用の第２コイル２１と電力送電回路２０とを備える。 The power receiving device 111 includes a power transmission antenna device 101 and a power receiving circuit 10. In addition, the power transmission device 121 includes a second coil 21 for power transmission and a power transmission circuit 20.
　電力伝送用アンテナ装置１０１は、第１コイル１１、第１結合部３１、第２結合部３２、および、第１結合部３１と第２結合部３２とを接続する接続部４で構成される。 The power transmission antenna device 101 includes the first coil 11, the first coupling unit 31, the second coupling unit 32, and the connection unit 4 that connects the first coupling unit 31 and the second coupling unit 32.
　第１コイル１１は複数ターンまたは１ターンのコイルであり、両端が電力受電回路１０に接続される。 The first coil 11 is a multi-turn or one-turn coil, and both ends thereof are connected to the power receiving circuit 10.
　第１結合部３１は、この例ではほぼ１ターンのコイル状導体である。第１結合部３１は、第１コイル１１とほぼ同径であり、第１結合部３１のコイル状導体に囲まれたコイル開口と第１コイル１１のコイル開口とは重なる。また、第１結合部３１は、第１コイル１１と同心位置に配置されている。すなわち、第１コイル１１および第１結合部３１のコイル開口を平面視して、第１コイル１１の形成領域（第１コイル１１のコイル導体およびコイル開口）と第１結合部３１の形成領域（第１結合部３１のコイル状導体およびコイル開口）とは重なる。そのため、第１コイル１１と第１結合部３１とは高い結合係数で磁界結合する。 In this example, the first coupling portion 31 is a coil-shaped conductor having approximately one turn. The first coupling portion 31 has substantially the same diameter as the first coil 11, and the coil opening surrounded by the coiled conductor of the first coupling portion 31 and the coil opening of the first coil 11 overlap. Further, the first coupling portion 31 is disposed concentrically with the first coil 11. That is, when the coil opening of the first coil 11 and the first coupling portion 31 is viewed in plan, the formation region of the first coil 11 (the coil conductor and the coil opening of the first coil 11) and the formation region of the first coupling portion 31 ( It overlaps with the coiled conductor and coil opening of the first coupling portion 31. Therefore, the first coil 11 and the first coupling portion 31 are magnetically coupled with a high coupling coefficient.
　第２結合部３２は、第１結合部３１よりも大きいコイル状導体を有し、この例ではほぼ１ターンのコイル状導体である。この第２結合部３２は電力送電装置１２１の第２コイル２１と磁界結合する。 The second coupling part 32 has a coiled conductor larger than that of the first coupling part 31, and in this example, is a coiled conductor of almost one turn. The second coupling unit 32 is magnetically coupled to the second coil 21 of the power transmission device 121.
　第１結合部３１と第２結合部３２とは接続部４を介して接続されている。 The first coupling unit 31 and the second coupling unit 32 are connected via the connection unit 4.
　電力送電装置１２１の第２コイル２１は、この例では複数ターンのコイルであり、その両端が電力送電回路２０に接続されている。 The second coil 21 of the power transmission device 121 is a multi-turn coil in this example, and both ends thereof are connected to the power transmission circuit 20.
　電力送電装置１２１の載置台内に第２コイル２１が設けられている。第２コイル２１のコイル導体およびコイル開口からなる第２コイル２１の形成領域は、電力受電装置１１１の第２結合部３２の形成領域より大きい。すなわち、第２コイル２１のコイル開口は、電力受電装置１１１の第２結合部３２のコイル開口より大きい。電力送電装置１２１の上記載置台に電力受電装置１１１が載置された状態で、第２結合部３２が第２コイル２１の形成領域内に入る。 The second coil 21 is provided in the mounting table of the power transmission device 121. The formation region of the second coil 21 including the coil conductor and the coil opening of the second coil 21 is larger than the formation region of the second coupling portion 32 of the power receiving device 111. That is, the coil opening of the second coil 21 is larger than the coil opening of the second coupling portion 32 of the power receiving device 111. The second coupling part 32 enters the formation region of the second coil 21 in a state in which the power receiving device 111 is placed on the mounting table above the power transmitting device 121.
　図２は電力伝送システム２０１の回路図である。図２に表れているように、第１コイル１１と第１結合部３１は磁界結合し、第２結合部３２と第２コイル２１は磁界結合する。また第１コイル１１と第２コイル２１とは直接的にも磁界結合する。 FIG. 2 is a circuit diagram of the power transmission system 201. As shown in FIG. 2, the first coil 11 and the first coupling portion 31 are magnetically coupled, and the second coupling portion 32 and the second coil 21 are magnetically coupled. The first coil 11 and the second coil 21 are directly magnetically coupled.
　電力送電回路２０は例えば6.78MHz（最も低いISM帯）等のHF帯の高周波電流を第２コイル２１に通電する。このことで、第２結合部３２および第１結合部３１に高周波電流が誘導される。第１結合部３１と第１コイル１１との磁界結合により、第１コイル１１に高周波電流が誘導される。また、第２コイル２１と第１コイル１１との磁界結合によっても、第１コイル１１に高周波電流が誘導される。 The power transmission circuit 20 energizes the second coil 21 with a high frequency current in the HF band such as 6.78 MHz (the lowest ISM band). As a result, a high frequency current is induced in the second coupling portion 32 and the first coupling portion 31. A high frequency current is induced in the first coil 11 by magnetic field coupling between the first coupling portion 31 and the first coil 11. A high frequency current is also induced in the first coil 11 by magnetic field coupling between the second coil 21 and the first coil 11.
　電力受電回路１０には整流平滑回路およびＤＣ－ＤＣコンバーが設けられている。第１コイル１１に誘導された高周波電流は上記整流平滑回路で整流平滑され、ＤＣ－ＤＣコンバータで所定の直流電圧に変換される。 The power receiving circuit 10 is provided with a rectifying / smoothing circuit and a DC-DC converter. The high-frequency current induced in the first coil 11 is rectified and smoothed by the rectifying and smoothing circuit, and converted to a predetermined DC voltage by the DC-DC converter.
　図１に表れているように、第１コイル１１と第１結合部３１とは、それらのコイル開口が同心且つほぼ同径であるので、両者の結合係数は第１コイル１１と第２結合部３２の結合係数より高い。また、第２コイル２１と第２結合部３２とは、第１コイル１１のコイル導体の巻回軸方向と第１結合部３１のコイル状導体の巻回軸方向が同じであり、第２コイル２１の形成領域と第２結合部３２の形成領域が互いに重なる領域の割合が大きいため、両者の結合係数は第２コイル２１と第１結合部３１の結合係数より高い。すなわち、第２コイル２１と第２結合部３２とは、それらのコイル開口が重なり、且つコイル開口の大きさが近似しているので、両者の結合係数は第２コイル２１と第１結合部３１の結合係数より高い。その結果、第１コイル１１は、第１結合部３１および第２結合部３２を介して第２コイル２１と強く結合する。 As shown in FIG. 1, the first coil 11 and the first coupling portion 31 have concentric and substantially the same diameter of the coil openings, so that the coupling coefficient of both is the first coil 11 and the second coupling portion. Higher than 32 coupling coefficients. The second coil 21 and the second coupling portion 32 have the same winding axis direction of the coil conductor of the first coil 11 and the winding axis direction of the coiled conductor of the first coupling portion 31. Since the ratio of the region where the formation region of 21 and the formation region of the second coupling portion 32 overlap each other is large, the coupling coefficient of both is higher than the coupling coefficient of the second coil 21 and the first coupling portion 31. That is, since the coil opening of the second coil 21 and the second coupling part 32 overlap and the size of the coil opening is approximate, the coupling coefficient of both is the second coil 21 and the first coupling part 31. Higher than the coupling coefficient. As a result, the first coil 11 is strongly coupled to the second coil 21 via the first coupling portion 31 and the second coupling portion 32.
　図３は電力伝送システム２０１の回路図であり、コイル極性を黒丸印で示す図である。図３に示すように第２コイル２１と第２結合部３２、第１コイル１１と第２コイル２１が、それぞれ同極性となり、第１コイル１１と第１結合部３１が逆極性となるように、コイル状導体の巻回方向を設計することで、第１コイル１１と第２コイル２１との直接的な磁界結合が、第１コイル１１と第１結合部３１との結合を強めあうように作用する。その結果、第１コイル１１と第２コイル２１との結合を強くすることができる。 FIG. 3 is a circuit diagram of the power transmission system 201, and shows the coil polarity with black circles. As shown in FIG. 3, the second coil 21 and the second coupling part 32, the first coil 11 and the second coil 21 have the same polarity, and the first coil 11 and the first coupling part 31 have the opposite polarity. By designing the winding direction of the coiled conductor, the direct magnetic field coupling between the first coil 11 and the second coil 21 enhances the coupling between the first coil 11 and the first coupling portion 31. Works. As a result, the coupling between the first coil 11 and the second coil 21 can be strengthened.
　図４（Ａ）は本実施形態における第１結合部３１および第２結合部３２の接続構造を示す図であり、図４（Ｂ）は比較例の電力伝送用アンテナ装置における第１結合部３１および第２結合部３２の接続構造を示す図である。 FIG. 4A is a diagram illustrating a connection structure of the first coupling portion 31 and the second coupling portion 32 in the present embodiment, and FIG. 4B is a diagram illustrating the first coupling portion 31 in the power transmission antenna device of the comparative example. FIG. 6 is a view showing a connection structure of the second coupling portion 32.
　比較例の場合、図４（Ｂ）に表れているように、第１結合部３１および第２結合部３２に矢印で示す電流が流れるとき、ドット記号とクロス記号で表されるような方向の磁界が発生する。第１結合部３１に流れる電流によって第１結合部３１の外側且つ第２結合部３２の内側に生じる磁界の方向と、第２結合部３２に流れる電流によって第２結合部３２の内側且つ第１結合部３１の外側に生じる磁界の方向は逆である。よって、第２結合部３２のコイル導体の周囲に生じる磁界に偏りが生じる。 In the case of the comparative example, as shown in FIG. 4B, when the current indicated by the arrows flows through the first coupling portion 31 and the second coupling portion 32, the direction of the direction represented by the dot symbol and the cross symbol. Magnetic field is generated. The direction of the magnetic field generated outside the first coupling part 31 and inside the second coupling part 32 by the current flowing through the first coupling part 31, and the inside of the second coupling part 32 and the first by the current flowing through the second coupling part 32. The direction of the magnetic field generated outside the coupling portion 31 is opposite. Therefore, the magnetic field generated around the coil conductor of the second coupling portion 32 is biased.
　これに対し、本実施形態においては、図４（Ａ）に表れているように、第１結合部３１および第２結合部３２に矢印で示す電流が流れるとき、ドット記号とクロス記号で表されるような方向の磁界が発生する。第１結合部３１に流れる電流によって第１結合部３１の外側且つ第２結合部３２の内側に生じる磁界の方向と、第２結合部３２に流れる電流によって第２結合部３２の内側且つ第１結合部３１の外側に生じる磁界の方向は同じ（ドット記号）である。 On the other hand, in the present embodiment, as shown in FIG. 4A, when currents indicated by arrows flow through the first coupling portion 31 and the second coupling portion 32, they are represented by dot symbols and cross symbols. A magnetic field in such a direction is generated. The direction of the magnetic field generated outside the first coupling part 31 and inside the second coupling part 32 by the current flowing through the first coupling part 31, and the inside of the second coupling part 32 and the first by the current flowing through the second coupling part 32. The direction of the magnetic field generated outside the coupling portion 31 is the same (dot symbol).
　このように本実施形態によれば、第１結合部３１に流れる電流の周回方向と第２結合部３２に流れる電流の周回方向とが互いに逆となるように、第１結合部３１と前記第２結合部３２とが接続されていることにより、第１結合部３１と第２結合部３２とを接続する接続部付近での、第１結合部３１に流れる電流によって生じる磁束と第２結合部３２に流れる電流によって生じる磁束とが相殺されない。そのため、第２結合部３２のコイル導体の周囲に生じる磁界の偏りを極力抑えることができる。 As described above, according to the present embodiment, the first coupling unit 31 and the first coupling unit 31 and the first coupling unit 31 are arranged such that the circulation direction of the current flowing through the first coupling unit 31 and the circulation direction of the current flowing through the second coupling unit 32 are opposite to each other. Since the two coupling portions 32 are connected, the magnetic flux generated by the current flowing through the first coupling portion 31 in the vicinity of the connection portion connecting the first coupling portion 31 and the second coupling portion 32 and the second coupling portion. The magnetic flux generated by the current flowing through 32 is not canceled out. For this reason, it is possible to suppress the bias of the magnetic field generated around the coil conductor of the second coupling portion 32 as much as possible.
　図５、図６（Ａ）（Ｂ）、図７（Ａ）（Ｂ）は、接続部４の構成を示す図である。図５は電力伝送用アンテナ装置１０１の平面図、図６（Ａ）（Ｂ）は、図５において、Ｘ－Ｙ平面にある電力伝送用アンテナ装置１０１をＺ軸上の所定高さからＹ軸方向に俯瞰した図である。また、図７（Ａ）（Ｂ）は、図５におけるＨ－Ｈ部分を視た図である。 FIGS. 5, 6 </ b> A, 6 </ b> B, and 7 </ b> A, 7 </ b> B are diagrams illustrating the configuration of the connection unit 4. 5 is a plan view of the power transmission antenna device 101, and FIGS. 6A and 6B are views of the power transmission antenna device 101 in the XY plane in FIG. It is the figure which looked down at the direction. 7A and 7B are views of the HH portion in FIG.
　図６（Ａ）、図７（Ａ）に示す電力伝送用アンテナ装置も、図６（Ｂ）、図７（Ｂ）に示す別の電力伝送用アンテナ装置も、第１結合部３１のコイル巻回軸方向において、第１結合部３１の位置（Ｚ軸方向の高さ）は接続部４の位置（Ｚ軸方向の高さ）とは異なる。 The power transmission antenna device shown in FIGS. 6 (A) and 7 (A) and the other power transmission antenna device shown in FIGS. 6 (B) and 7 (B) are both coil-wound in the first coupling portion 31. In the rotational axis direction, the position of the first coupling portion 31 (the height in the Z-axis direction) is different from the position of the connection portion 4 (the height in the Z-axis direction).
　図６（Ａ）、図７（Ａ）に示す例では、第１結合部３１のＺ軸方向の高さは第２結合部３２のＺ軸方向の高さと異なる。第１コイル１１は第１結合部３１とほぼ同一高さにある。 6A and 7A, the height of the first coupling portion 31 in the Z-axis direction is different from the height of the second coupling portion 32 in the Z-axis direction. The first coil 11 is substantially at the same height as the first coupling portion 31.
　図６（Ｂ）、図７（Ｂ）に示す例では、第１結合部３１のＺ軸方向の高さと第２結合部３２のＺ軸方向の高さとはほぼ等しい。第１コイル１１は第１結合部３１および第２結合部３２とほぼ同一高さにある。 6B and FIG. 7B, the height of the first coupling portion 31 in the Z-axis direction and the height of the second coupling portion 32 in the Z-axis direction are substantially equal. The first coil 11 is substantially at the same height as the first coupling portion 31 and the second coupling portion 32.
　このように、第１結合部３１のコイル巻回軸方向における接続部の位置（Ｚ軸方向の高さ）は第１結合部３１の位置と異なるので、接続部４の鋭角的な折れ曲がりがなくなって、接続部の断線が防止できる。また、平面視では、第１結合部３１と第２結合部３２との接続部は鋭角的となって、第２結合部の実効的なコイル開口を大きくできる。特に、第１結合部３１、第２結合部３２および接続部４は、基板上の導体パターンではなく、一連の絶縁被覆されたCu等の導電性ワイヤーで構成できるので、第１結合部３１、第２結合部３２および接続部４の直流抵抗を小さくでき、その結果、第１結合部３１、第２結合部３２および接続部４を設けることによる損失増加は抑制できる。 As described above, the position of the connecting portion (the height in the Z-axis direction) in the coil winding axis direction of the first coupling portion 31 is different from the position of the first coupling portion 31, so that there is no acute bending of the connecting portion 4. Thus, disconnection of the connecting portion can be prevented. Further, in plan view, the connection portion between the first coupling portion 31 and the second coupling portion 32 becomes acute, and the effective coil opening of the second coupling portion can be increased. In particular, since the first coupling part 31, the second coupling part 32, and the connection part 4 can be configured by a series of conductive wires such as Cu coated with insulation instead of the conductor pattern on the substrate, the first coupling part 31, The direct current resistance of the second coupling portion 32 and the connection portion 4 can be reduced, and as a result, an increase in loss due to the provision of the first coupling portion 31, the second coupling portion 32, and the connection portion 4 can be suppressed.
　また、図６（Ａ）、図７（Ａ）に示す例では、第１コイル１１と第２結合部３２とは高さ方向（Ｚ軸方向）に離れているので、第１コイル１１と第２結合部３２および接続部４との不要結合が抑制される。図６（Ｂ）、図７（Ｂ）に示す例では、第１コイル１１と接続部４とは高さ方向（Ｚ軸方向）に離れているので、第１コイル１１と接続部４との不要結合が抑制される。すなわち、いずれも不要結合による相殺が抑制されて、第１コイル１１と第１結合部３１との実効的な結合係数は高い。 In the example shown in FIGS. 6A and 7A, the first coil 11 and the second coupling portion 32 are separated from each other in the height direction (Z-axis direction). 2 Unnecessary coupling with the coupling portion 32 and the connection portion 4 is suppressed. In the example shown in FIG. 6B and FIG. 7B, the first coil 11 and the connection portion 4 are separated in the height direction (Z-axis direction). Unnecessary binding is suppressed. That is, in any case, cancellation due to unnecessary coupling is suppressed, and the effective coupling coefficient between the first coil 11 and the first coupling portion 31 is high.
《第２の実施形態》
　第２の実施形態では、第１の実施形態とは、第１結合部と第２結合部の形状が異なる電力伝送用アンテナ装置の例を示す。 << Second Embodiment >>
In the second embodiment, an example of a power transmission antenna device in which the shapes of the first coupling portion and the second coupling portion are different from those in the first embodiment is shown.
　図８は第２の実施形態に係る電力伝送用アンテナ装置１０２および電力伝送システム２０２の構成を示す図である。電力伝送システム２０２は、電力受電装置１１２と電力送電装置１２２とで構成される。電力受電装置１１２は、電力伝送用アンテナ装置１０２と電力受電回路１０とを備える。また、電力送電装置１２２は、電力送電用の第２コイル２１と電力送電回路２０とを備える。 FIG. 8 is a diagram showing a configuration of the power transmission antenna device 102 and the power transmission system 202 according to the second embodiment. The power transmission system 202 includes a power receiving device 112 and a power transmitting device 122. The power receiving device 112 includes a power transmission antenna device 102 and a power receiving circuit 10. The power transmission device 122 includes the second coil 21 for power transmission and the power transmission circuit 20.
　電力伝送用アンテナ装置１０２は、第１コイル１１、第１結合部３１、第２結合部３２、および、第１結合部３１と第２結合部３２とを接続する接続部４で構成される。 The power transmission antenna device 102 includes the first coil 11, the first coupling unit 31, the second coupling unit 32, and the connection unit 4 that connects the first coupling unit 31 and the second coupling unit 32.
　第１コイル１１は複数ターンまたは１ターンのコイルであり、両端が電力受電回路１０に接続される。 The first coil 11 is a multi-turn or one-turn coil, and both ends thereof are connected to the power receiving circuit 10.
　第１結合部３１は、この例ではほぼ１ターンのコイル状導体である。第１結合部３１は、第１コイル１１とほぼ同径であり、第１コイル１１と同心位置に配置されている。すなわち、第１コイル１１および第１結合部３１のコイル開口を平面視して、第１コイル１１の形成領域と第１結合部３１の形成領域とは重なる。 In this example, the first coupling portion 31 is a coil-shaped conductor having approximately one turn. The first coupling portion 31 has substantially the same diameter as the first coil 11 and is disposed concentrically with the first coil 11. That is, when the coil openings of the first coil 11 and the first coupling portion 31 are viewed in plan, the formation region of the first coil 11 and the formation region of the first coupling portion 31 overlap.
　第１結合部３１のコイル開口の平面視で、第１結合部３１は第２結合部３２のコイル開口の外側に配置され、第１結合部３１に流れる電流の周回方向と第２結合部３２に流れる電流の周回方向とが互いに逆となるように、第１結合部３１と第２結合部３２とは接続部４で接続されている。 In a plan view of the coil opening of the first coupling part 31, the first coupling part 31 is arranged outside the coil opening of the second coupling part 32, and the direction of the current flowing through the first coupling part 31 and the second coupling part 32. The first coupling portion 31 and the second coupling portion 32 are connected by the connection portion 4 so that the circulation directions of the currents flowing through the first and second coupling portions are opposite to each other.
　第２結合部３２は、第１結合部３１よりも大きいコイル状導体を有し、この例ではほぼ１ターンのコイル状導体である。この第２結合部３２は電力送電装置１２１の第２コイル２１と磁界結合する。 The second coupling part 32 has a coiled conductor larger than that of the first coupling part 31, and in this example, is a coiled conductor of almost one turn. The second coupling unit 32 is magnetically coupled to the second coil 21 of the power transmission device 121.
　電力送電装置１２２は、電力受電装置１１２が載置される載置台を備え、この載置台内に第２コイル２１が設けられている。第２コイル２１のコイル開口は、電力受電装置１１２の第２結合部３２のコイル開口より大きい。電力送電装置１２２の上記載置台に電力受電装置１１２が載置された状態で、第２結合部３２および第１結合部３１は第２コイル２１の開口内に入る。 The power transmission device 122 includes a mounting table on which the power receiving device 112 is mounted, and the second coil 21 is provided in the mounting table. The coil opening of the second coil 21 is larger than the coil opening of the second coupling portion 32 of the power receiving device 112. The second coupling portion 32 and the first coupling portion 31 enter the opening of the second coil 21 in a state where the power receiving device 112 is placed on the mounting table above the power transmitting device 122.
　図９は本実施形態における第１結合部３１および第２結合部３２の接続構造を示す図である。本実施形態においては、図９に表れているように、第１結合部３１および第２結合部３２に矢印で示す電流が流れるとき、ドット記号とクロス記号で表されるような方向の磁界が発生する。第１結合部３１に流れる電流によって第２結合部３２の内側に生じる磁界の方向と、第２結合部３２に流れる電流によって第２結合部３２の内側に生じる磁界の方向は同じ（ドット記号）である。 FIG. 9 is a diagram showing a connection structure of the first coupling portion 31 and the second coupling portion 32 in the present embodiment. In the present embodiment, as shown in FIG. 9, when the current indicated by the arrows flows through the first coupling portion 31 and the second coupling portion 32, the magnetic field in the direction represented by the dot symbol and the cross symbol is generated. appear. The direction of the magnetic field generated inside the second coupling unit 32 by the current flowing through the first coupling unit 31 is the same as the direction of the magnetic field generated inside the second coupling unit 32 by the current flowing through the second coupling unit 32 (dot symbol). It is.
　このように本実施形態によれば、第１コイル１１との結合により第１結合部３１に流れる電流と第２結合部３２に流れる電流とは相殺されない。そのため、第１コイル１１と、第１結合部３１および第２結合部３２との結合を高めることができ、伝送効率が上がる。 As described above, according to the present embodiment, the current flowing through the first coupling portion 31 and the current flowing through the second coupling portion 32 are not canceled by the coupling with the first coil 11. Therefore, the coupling between the first coil 11 and the first coupling unit 31 and the second coupling unit 32 can be enhanced, and the transmission efficiency is increased.
《第３の実施形態》
　第３の実施形態では、第２の実施形態とは、第１結合部と第２結合部との接続構造が異なる電力伝送用アンテナ装置の例を示す。 << Third Embodiment >>
In the third embodiment, an example of a power transmission antenna device having a connection structure between the first coupling unit and the second coupling unit is different from that of the second embodiment.
　図１０は第３の実施形態に係る電力伝送用アンテナ装置１０３の構成を示す図である。電力伝送用アンテナ装置１０３は、第１コイル１１、第１結合部３１、第２結合部３２、および、第１結合部３１と第２結合部３２とを接続する接続部４で構成される。 FIG. 10 is a diagram showing a configuration of the power transmission antenna device 103 according to the third embodiment. The power transmission antenna device 103 includes the first coil 11, the first coupling unit 31, the second coupling unit 32, and the connection unit 4 that connects the first coupling unit 31 and the second coupling unit 32.
　第１コイル１１は複数ターンまたは１ターンのコイルであり、両端が電力受電回路に接続される。 The first coil 11 is a multi-turn or one-turn coil, and both ends thereof are connected to the power receiving circuit.
　第１結合部３１は、この例ではほぼ１ターンのコイル状導体である。第１結合部３１は、第１コイル１１とほぼ同径であり、第１コイル１１と同心位置に配置されている。すなわち、第１コイル１１および第１結合部３１のコイル開口を平面視して、第１コイル１１の形成領域と第１結合部３１の形成領域とは重なる。 In this example, the first coupling portion 31 is a coil-shaped conductor having approximately one turn. The first coupling portion 31 has substantially the same diameter as the first coil 11 and is disposed concentrically with the first coil 11. That is, when the coil openings of the first coil 11 and the first coupling portion 31 are viewed in plan, the formation region of the first coil 11 and the formation region of the first coupling portion 31 overlap.
　第１結合部３１のコイル開口の平面視で、第１結合部３１は第２結合部３２のコイル開口の外側に配置され、第１結合部３１に流れる電流の周回方向と第２結合部３２に流れる電流の周回方向とが同方向となるように、第１結合部３１と第２結合部３２とは接続部４で接続されている。 In a plan view of the coil opening of the first coupling part 31, the first coupling part 31 is arranged outside the coil opening of the second coupling part 32, and the direction of the current flowing through the first coupling part 31 and the second coupling part 32. The first coupling portion 31 and the second coupling portion 32 are connected by the connection portion 4 so that the direction of circulation of the current flowing through the first and second coupling portions is the same.
　第２結合部３２は、第１結合部３１よりも大きいコイル状導体を有し、この例ではほぼ１ターンのコイル状導体である。この第２結合部３２は電力送電装置の第２コイル２１と磁界結合する。 The second coupling part 32 has a coiled conductor larger than that of the first coupling part 31, and in this example, is a coiled conductor of almost one turn. The second coupling unit 32 is magnetically coupled to the second coil 21 of the power transmission device.
　本実施形態によれば、第１結合部３１と第２結合部３２が接続部４を介して平面上で離れているので、第１コイル１１と第２結合部３２との不要結合が抑えられる。そのため、第１コイル１１と第１結合部３１および第２結合部３２との結合係数を大きくできる。 According to the present embodiment, since the first coupling portion 31 and the second coupling portion 32 are separated on the plane via the connection portion 4, unnecessary coupling between the first coil 11 and the second coupling portion 32 can be suppressed. . Therefore, the coupling coefficient between the first coil 11 and the first coupling unit 31 and the second coupling unit 32 can be increased.
《第４の実施形態》
　第４の実施形態では、共振用キャパシタを備える電力伝送用アンテナ装置の例を示す。 << Fourth Embodiment >>
In the fourth embodiment, an example of an antenna device for power transmission provided with a resonance capacitor is shown.
　図１１は第４の実施形態に係る電力伝送用アンテナ装置１０４およびそれを備える電力伝送システムの構成を示す図である。 FIG. 11 is a diagram illustrating a configuration of a power transmission antenna device 104 and a power transmission system including the power transmission antenna device 104 according to the fourth embodiment.
　電力伝送用アンテナ装置１０４は、第１コイル１１、第１結合部３１、第２結合部３２、および、第１結合部３１と第２結合部３２とを接続する接続部で構成される。 The power transmission antenna device 104 includes a first coil 11, a first coupling unit 31, a second coupling unit 32, and a connection unit that connects the first coupling unit 31 and the second coupling unit 32.
　第１コイル１１には電力受電回路１０が接続されている。また、電力送電装置の第２コイル２１には電力送電回路２０が接続されている。 A power receiving circuit 10 is connected to the first coil 11. The power transmission circuit 20 is connected to the second coil 21 of the power transmission device.
　第１結合部３１には共振用キャパシタＣ１が直列に接続されていて、第２結合部３２には共振用キャパシタＣ２が直列に接続されている。この第１結合部３１、第２結合部３２、および共振用キャパシタＣ１，Ｃ２による合成のＬＣ回路の共振周波数は、第１結合部３１のインダクタンスと第２結合部３２のインダクタンスによる合成インダクタンスと、共振用キャパシタＣ１のキャパシタンスと共振用キャパシタＣ２のキャパシタンスによる合成キャパシタンスとによって定まる。合成のＬＣ回路の共振周波数は、電力伝送で用いる周波数（例えば6.78MHz）またはその近傍の周波数であることが好ましい。 A resonance capacitor C1 is connected in series to the first coupling portion 31, and a resonance capacitor C2 is connected in series to the second coupling portion 32. The resonance frequency of the LC circuit composed of the first coupling unit 31, the second coupling unit 32, and the resonance capacitors C1 and C2 is the combined inductance of the inductance of the first coupling unit 31 and the inductance of the second coupling unit 32, and It is determined by the capacitance of the resonance capacitor C1 and the combined capacitance of the resonance capacitor C2. The resonance frequency of the combined LC circuit is preferably a frequency used for power transmission (for example, 6.78 MHz) or a frequency in the vicinity thereof.
　また、第１結合部３１と共振用キャパシタＣ１とで第１のＬＣ回路とみなし、第２結合部３２と共振用キャパシタＣ２とで第２のＬＣ回路とみなす。この場合、第１のＬＣ回路の第１結合部３１のインダクタンスと共振用キャパシタＣ１のキャパシタンスとで定まる共振周波数と、第２のＬＣ回路の第２結合部３２のインダクタンスと共振用キャパシタＣ２のキャパシタンスとで定まる共振周波数とは、合成のＬＣ回路の共振周波数またはその近傍の周波数であることが好ましい。これにより、第１結合部と第２結合部の一方または両方が、電界結合、磁界結合またはその両方により影響を受けることで、共振周波数が大きく変動することを抑制する。 The first coupling unit 31 and the resonance capacitor C1 are regarded as a first LC circuit, and the second coupling unit 32 and the resonance capacitor C2 are regarded as a second LC circuit. In this case, the resonance frequency determined by the inductance of the first coupling portion 31 of the first LC circuit and the capacitance of the resonance capacitor C1, the inductance of the second coupling portion 32 of the second LC circuit, and the capacitance of the resonance capacitor C2. The resonance frequency determined by is preferably the resonance frequency of the synthesized LC circuit or a frequency in the vicinity thereof. Thereby, one or both of the first coupling portion and the second coupling portion are affected by electric field coupling, magnetic field coupling, or both, thereby suppressing the resonance frequency from fluctuating greatly.
　なお、本実施形態では、第１コイル１１にキャパシタＣ１０が並列接続されていて、第２コイル２１にはキャパシタＣ２０が並列接続されている。第１コイル１１とキャパシタＣ１０によるＬＣ共振回路の共振周波数、第２コイル２１とキャパシタＣ２０によるＬＣ共振回路の共振周波数のいずれも、電力伝送で用いる周波数（例えば6.78MHz）またはその近傍の周波数であることが好ましい。 In the present embodiment, the capacitor C10 is connected in parallel to the first coil 11, and the capacitor C20 is connected in parallel to the second coil 21. The resonance frequency of the LC resonance circuit including the first coil 11 and the capacitor C10 and the resonance frequency of the LC resonance circuit including the second coil 21 and the capacitor C20 are both frequencies used for power transmission (for example, 6.78 MHz) or frequencies in the vicinity thereof. It is preferable.
　これにより、第１コイル１１と第１結合部３１との結合、および、第２コイル２１と第２結合部３２との結合が低下しても、低い駆動電圧で高効率な電力伝送が可能となる。 As a result, even if the coupling between the first coil 11 and the first coupling portion 31 and the coupling between the second coil 21 and the second coupling portion 32 are reduced, highly efficient power transmission can be performed with a low drive voltage. Become.
《第５の実施形態》
　以上に示した各実施形態では、第１コイル１１に電力受電回路１０を接続し、第２コイル２１に電力送電回路２０を接続した例を示したが、この関係は逆でもよい。すなわち、第１コイル１１を電力送電側のコイルとし、第２コイル２１を電力受電側のコイルとしてもよい。その場合には、第１コイル１１に電力送電回路を接続して、この第１コイル１１と電力送電回路とで電力送電装置を構成し、第２コイル２１に電力受電回路を接続して、この第２コイル２１と電力受電回路とで電力受電装置を構成する。 << Fifth Embodiment >>
In each of the embodiments described above, the example in which the power receiving circuit 10 is connected to the first coil 11 and the power transmitting circuit 20 is connected to the second coil 21 has been described, but this relationship may be reversed. That is, the first coil 11 may be a power transmission side coil, and the second coil 21 may be a power reception side coil. In that case, a power transmission circuit is connected to the first coil 11, a power transmission device is configured by the first coil 11 and the power transmission circuit, and a power reception circuit is connected to the second coil 21. The second coil 21 and the power receiving circuit constitute a power receiving device.
　なお、各実施形態で示した例では、第１結合部３１および第２結合部３２はそれぞれほぼ１ターンのコイル状としたが、第１結合部３１および第２結合部３２の一方を複数ターンのコイル状としてもよい。また、両方を複数ターンのコイル状としてもよい。 In the example shown in each embodiment, each of the first coupling portion 31 and the second coupling portion 32 has a substantially one-turn coil shape, but one of the first coupling portion 31 and the second coupling portion 32 has a plurality of turns. It is good also as a coil shape. Moreover, it is good also considering both as a coil shape of multiple turns.
　また、各実施形態で示した例では、第１コイル１１のコイル導体と第１結合部３１のコイル状導体は同心（共通の巻回軸）としたが、それぞれの巻回軸は異なっていてもよい。第１結合部３１のコイル開口を平面視したとき、第１コイル１１と第１結合部３１のそれぞれの形成領域（好ましくはそれぞれのコイル開口）が重なればよい。また、第１コイル１１のコイル導体と第１結合部３１のコイル状導体のそれぞれの巻回軸方向も同じであることが望ましいが、巻回軸方向が互いに角度をなしていてもよい。それぞれの巻回軸のなす角は４５度以内であることが好ましい。 Moreover, in the example shown by each embodiment, although the coil conductor of the 1st coil 11 and the coiled conductor of the 1st coupling | bond part 31 were concentric (common winding axis | shaft), each winding axis | shaft was different. Also good. When the coil opening of the first coupling portion 31 is viewed in plan, the formation regions (preferably the respective coil openings) of the first coil 11 and the first coupling portion 31 may overlap. Further, it is desirable that the winding axis directions of the coil conductor of the first coil 11 and the coiled conductor of the first coupling portion 31 are the same, but the winding axis directions may be at an angle to each other. The angle formed by each winding axis is preferably within 45 degrees.
　また、各実施形態で示した例では、第１コイル１１のコイル開口と第１結合部３１のコイル開口はほぼ同形状としたが、異なっていてもよい。コイル開口は同じであるほど結合係数が高くなるため、一方のコイル開口の面積が他方のコイル開口の面積の２倍未満であることが好ましい。 In the example shown in each embodiment, the coil opening of the first coil 11 and the coil opening of the first coupling portion 31 have substantially the same shape, but may be different. Since the coupling coefficient increases as the coil openings are the same, the area of one coil opening is preferably less than twice the area of the other coil opening.
　また、各実施形態で示した例では、第１コイル１１、第２コイル２１、第１結合部３１、はそれぞれ円形状に形成されたコイル導体であるが、楕円や矩形等の多角形など、他の形状でもよい。但し、コイル導体が円形であれば、それぞれの巻回軸に関して回転させた場合でも、回転させた角度の違いによる特性の変化は小さい。 Moreover, in the example shown by each embodiment, although the 1st coil 11, the 2nd coil 21, and the 1st coupling | bond part 31 are the coil conductors each formed in circular shape, polygons, such as an ellipse and a rectangle, Other shapes may be used. However, if the coil conductor is circular, even when the coil conductor is rotated with respect to each winding axis, the change in characteristics due to the difference in the rotated angle is small.
　また、各実施形態で、第１コイル１１と第１結合部３１との結合を高めるため、または第２コイル２１と第２結合部３２との結合を高めるため、磁性体を配置してもよい。 In each embodiment, a magnetic material may be disposed to enhance the coupling between the first coil 11 and the first coupling portion 31 or to enhance the coupling between the second coil 21 and the second coupling portion 32. .
　最後に、上述の実施形態の説明は、すべての点で例示であって、制限的なものではない。当業者にとって変形および変更が適宜可能である。本発明の範囲は、上述の実施形態ではなく、請求の範囲によって示される。さらに、本発明の範囲には、請求の範囲内と均等の範囲内での実施形態からの変更が含まれる。 Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention includes modifications from the embodiments within the scope equivalent to the claims.
Ｃ１，Ｃ２，Ｃ１０，Ｃ２０…共振用キャパシタ
４…接続部
１０…電力受電回路
１１…第１コイル
２０…電力送電回路
２１…第２コイル
３１…第１結合部
３２…第２結合部
１０１，１０２，１０３，１０４…電力伝送用アンテナ装置
１１１，１１２…電力受電装置
１２１，１２２…電力送電装置
２０１，２０２…電力伝送システム C1, C2, C10, C20 ... Resonant capacitor 4 ... Connection unit 10 ... Power receiving circuit 11 ... First coil 20 ... Power transmission circuit 21 ... Second coil 31 ... First coupling unit 32 ... Second coupling unit 101, 102 , 103, 104 ... power transmission antenna devices 111, 112 ... power reception devices 121, 122 ... power transmission devices 201, 202 ... power transmission system

Claims (10)

  1. 　ワイヤレス電力伝送システムの電力送電回路または電力受電回路の少なくとも何れかが接続される第１コイルと、
    　前記第１コイルと結合するコイル状導体を有する第１結合部と、
    　相手装置の第２コイルと結合し、前記第１結合部よりも大きいコイル状導体を有する第２結合部と、
    　前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
    　前記第１コイルの形成領域と前記第１結合部の形成領域とは、第１結合部のコイル開口の平面視で重なる、電力伝送用アンテナ装置。     A first coil to which at least one of a power transmission circuit or a power reception circuit of the wireless power transmission system is connected;
    A first coupling portion having a coiled conductor coupled to the first coil;
    A second coupling portion coupled to the second coil of the counterpart device and having a coiled conductor larger than the first coupling portion;
    A coil antenna having a connection portion connecting the first coupling portion and the second coupling portion;
    The power transmission antenna device, wherein the formation region of the first coil and the formation region of the first coupling portion overlap in a plan view of the coil opening of the first coupling portion.
  2. 　前記第１結合部のコイル開口の平面視で、前記第１結合部は前記第２結合部のコイル開口と重なり、前記第１結合部に流れる電流の周回方向と前記第２結合部に流れる電流の周回方向とが互いに逆となるように、前記第１結合部と前記第２結合部とは前記接続部で接続されている、請求項１に記載の電力伝送用アンテナ装置。 In plan view of the coil opening of the first coupling part, the first coupling part overlaps with the coil opening of the second coupling part, and the current flowing in the second coupling part and the current flowing in the second coupling part The power transmission antenna device according to claim 1, wherein the first coupling unit and the second coupling unit are connected by the connection unit such that the rotation directions of the first coupling unit and the second coupling unit are opposite to each other.
  3. 　前記第１結合部のコイル巻回軸方向において、前記第１結合部の位置は前記接続部の位置と異なる、請求項２に記載の電力伝送用アンテナ装置。 The power transmission antenna device according to claim 2, wherein a position of the first coupling portion is different from a position of the connection portion in a coil winding axis direction of the first coupling portion.
  4. 　前記第１結合部のコイル開口の平面視で、前記第１結合部は前記第２結合部のコイル開口の外側に配置され、前記第１結合部に流れる電流の周回方向と前記第２結合部に流れる電流の周回方向とが互いに逆となるように、前記第１結合部と前記第２結合部とは前記接続部で接続されている、請求項１に記載の電力伝送用アンテナ装置。 In a plan view of the coil opening of the first coupling part, the first coupling part is disposed outside the coil opening of the second coupling part, and the direction of the current flowing through the first coupling part and the second coupling part 2. The power transmission antenna device according to claim 1, wherein the first coupling portion and the second coupling portion are connected by the connection portion so that the circulation directions of currents flowing through the first and second coupling portions are opposite to each other.
  5. 　前記第１コイルに接続されるキャパシタを備える、請求項１から４のいずれかに記載の電力伝送用アンテナ装置。 The antenna device for power transmission according to any one of claims 1 to 4, further comprising a capacitor connected to the first coil.
  6. 　前記第１結合部に接続されるキャパシタを備える、請求項１から５のいずれかに記載の電力伝送用アンテナ装置。 The power transmission antenna device according to any one of claims 1 to 5, further comprising a capacitor connected to the first coupling portion.
  7. 　前記第２結合部に接続されるキャパシタを備える、請求項１から６のいずれかに記載の電力伝送用アンテナ装置。 The power transmission antenna device according to any one of claims 1 to 6, further comprising a capacitor connected to the second coupling portion.
  8. 　電力送電回路または電力受電回路と、前記電力送電回路または前記電力受電回路の少なくとも何れかが接続される電力伝送用アンテナ装置とを備える電子機器において、
    　前記電力伝送用アンテナ装置は、
    　前記電力送電回路または前記電力受電回路の少なくとも何れかが接続される第１コイルと、
    　前記第１コイルと結合するコイル状導体を有する第１結合部と、相手装置の第２コイルと結合し、前記第１結合部よりも形成領域の大きなコイル状導体を有する第２結合部と、前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
    　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１結合部のコイル開口の平面視で重なる、電子機器。     In an electronic device comprising a power transmission circuit or a power reception circuit and a power transmission antenna device to which at least one of the power transmission circuit or the power reception circuit is connected,
    The power transmission antenna device includes:
    A first coil to which at least one of the power transmission circuit or the power reception circuit is connected;
    A first coupling part having a coiled conductor coupled to the first coil, a second coupling part coupled to the second coil of the counterpart device and having a coiled conductor having a larger formation area than the first coupling part; A coil antenna having a connection portion connecting the first coupling portion and the second coupling portion;
    The electronic device in which the formation region of the first coil and the formation region of the first coupling portion overlap in a plan view of the coil opening of the first coupling portion.
  9. 　電力送電装置および電力受電装置を含む電力伝送システムにおいて、
    　前記電力受電装置は、電力受電回路と、当該電力受電装置に接続された電力伝送用アンテナ装置とを有し、
    　前記電力送電装置は、電力送電回路と、当該電力送電回路に接続された第２コイルとを有し、
    　前記電力伝送用アンテナ装置は、
    　前記電力受電回路が接続される第１コイルと、
    　前記第１コイルと結合するコイル状導体を有する第１結合部と、前記第２コイルと結合し、前記第１結合部よりも形成領域の大きなコイル状導体を有する第２結合部と、前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
    　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１結合部のコイル開口の平面視で重なる、電力伝送システム。     In a power transmission system including a power transmission device and a power reception device,
    The power receiving device includes a power receiving circuit and a power transmission antenna device connected to the power receiving device.
    The power transmission device includes a power transmission circuit and a second coil connected to the power transmission circuit,
    The power transmission antenna device includes:
    A first coil to which the power receiving circuit is connected;
    A first coupling portion having a coiled conductor coupled to the first coil; a second coupling portion coupled to the second coil and having a coiled conductor having a larger formation area than the first coupling portion; A coil antenna having a connecting portion for connecting the first connecting portion and the second connecting portion;
    The power transmission system, wherein the formation region of the first coil and the formation region of the first coupling portion overlap in a plan view of the coil opening of the first coupling portion.
  10. 　電力送電装置および電力受電装置を含む電力伝送システムにおいて、
    　前記電力受電装置は、電力受電回路と、当該電力受電回路に接続された第２コイルとを有し、
    　前記電力送電装置は、電力送電回路と、当該電力送電装置に接続された電力伝送用アンテナ装置とを有し、
    　前記電力伝送用アンテナ装置は、
    　前記電力送電回路が接続される第１コイルと、
    　前記第１コイルと結合するコイル状導体を有する第１結合部と、前記第２コイルと結合し、前記第１結合部よりも形成領域の大きなコイル状導体を有する第２結合部と、前記第１結合部と前記第２結合部とを接続する接続部と、を有するコイルアンテナを備え、
    　前記第１コイルの形成領域と前記第１結合部の形成領域とは、前記第１結合部のコイル開口の平面視で重なる、電力伝送システム。     In a power transmission system including a power transmission device and a power reception device,
    The power receiving device includes a power receiving circuit and a second coil connected to the power receiving circuit.
    The power transmission device includes a power transmission circuit and a power transmission antenna device connected to the power transmission device.
    The power transmission antenna device includes:
    A first coil to which the power transmission circuit is connected;
    A first coupling portion having a coiled conductor coupled to the first coil; a second coupling portion coupled to the second coil and having a coiled conductor having a larger formation area than the first coupling portion; A coil antenna having a connecting portion for connecting the first connecting portion and the second connecting portion;
    The power transmission system, wherein the formation region of the first coil and the formation region of the first coupling portion overlap in a plan view of the coil opening of the first coupling portion.
PCT/JP2016/081035 2015-11-19 2016-10-20 Antenna device for power transmission, electronic device and power transmission system WO2017086083A1 (en)

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WO2019026378A1 (en) * 2017-08-02 2019-02-07 矢崎総業株式会社 Antenna
JP2019208145A (en) * 2018-05-30 2019-12-05 矢崎総業株式会社 Antenna unit
CN115000690A (en) * 2021-03-02 2022-09-02 Tdk株式会社 Antenna device and antenna module provided with same

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JP2011234496A (en) * 2010-04-27 2011-11-17 Nippon Soken Inc Coil unit, non-contact power transmission device, non-contact power reception device, non-contact power supply system and vehicle
JP2013162611A (en) * 2012-02-03 2013-08-19 Seiko Instruments Inc Wireless power feeding device

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JP2011234496A (en) * 2010-04-27 2011-11-17 Nippon Soken Inc Coil unit, non-contact power transmission device, non-contact power reception device, non-contact power supply system and vehicle
JP2013162611A (en) * 2012-02-03 2013-08-19 Seiko Instruments Inc Wireless power feeding device

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WO2019026378A1 (en) * 2017-08-02 2019-02-07 矢崎総業株式会社 Antenna
JP2019029928A (en) * 2017-08-02 2019-02-21 矢崎総業株式会社 antenna
CN110998977A (en) * 2017-08-02 2020-04-10 矢崎总业株式会社 Antenna with a shield
CN110998977B (en) * 2017-08-02 2021-06-04 矢崎总业株式会社 Antenna with a shield
JP2019208145A (en) * 2018-05-30 2019-12-05 矢崎総業株式会社 Antenna unit
JP7031986B2 (en) 2018-05-30 2022-03-08 矢崎総業株式会社 Antenna unit
CN115000690A (en) * 2021-03-02 2022-09-02 Tdk株式会社 Antenna device and antenna module provided with same

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