Wireless power transmission device, wireless power receiving device, and wireless power supply system

Abstract

To provide a wireless power transmission device, a wireless power receiving device, and a wireless power supply system that have simple and lightweight configurations capable of being highly effective in reducing leakage magnetic fields, even at locations far from a power transmitting coil and a power receiving coil.SOLUTION: A wireless power transmission device that transmits power contactlessly includes: a power transmitting coil that transmits power; a driving induction coil provided around the power transmitting coil; and a canceling magnetic field generating coil connected in series to at least a portion of the driving induction coil so as to surround at least a portion of the power transmitting coil, in which a leakage magnetic field canceling coil is formed by the driving induction coil and the canceling magnetic field generating coil.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wireless power transmitting device, a wireless power receiving device, and a wireless power supply system.

[0002] More specifically, the present invention relates to a wireless power transmitting device, a wireless power receiving device, and a wireless power supply system that are suitable for use when supplying power to various power supply targets, such as batteries mounted on electric vehicles (EVs) and plug-in hybrid vehicles (PHVs). [Background technology]

[0003] Conventionally, wireless power supply systems (contactless power supply systems) that supply power to various power supply targets such as batteries mounted on electric vehicles and plug-in hybrid vehicles in a contactless manner have been known.

[0004] Such a wireless power supply system transmits power contactlessly from a wireless power transmitting device to a wireless power receiving device by utilizing the magnetic field resonance phenomenon between a resonant circuit on the power transmitting coil side of a wireless power transmitting device and a resonant circuit on the power receiving coil side of a wireless power receiving device.

[0005] However, with the emergence of large EVs, the demand for rapid power supply, and the realization of power supply while driving, it has been pointed out that leakage magnetic fields from the power transmission coil can cause magnetic noise and have a negative impact on the surrounding environment.

[0006] In light of these points, a method has been proposed for blocking leakage magnetic fields from a power transmission coil, such as a method using a wireless power supply system disclosed in Japanese Patent Application Laid-Open No. 2020-167753.

[0007] The method disclosed in JP 2020-167753 A involves placing a magnetic shielding member around the power transmission coil.

[0008] However, according to the method disclosed in JP 2020-167753 A, the structure of the power transmission coil side of the wireless power transmission device, which is generally installed on the ground when supplying power to electric vehicles or plug-in hybrid vehicles, is complex, large, and heavy, making installation cumbersome and causing various problems, such as getting in the way when people are walking.

[0009] Furthermore, the method disclosed in Patent Publication No. 2020-167753 only provides local magnetic shielding on the ground surface, which has the problem of being less effective in reducing leakage magnetic fields at positions away from the power transmission coil. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2020-167753 Summary of the Invention [Problem to be solved by the invention]

[0011] The present invention has been made in consideration of the various problems in the conventional technology as described above, and its object is to provide a wireless power transmitting device, a wireless power receiving device, and a wireless power supply system that are simple in configuration, lightweight, and highly effective in reducing leakage magnetic fields even at positions distant from the transmitting coil and the receiving coil. [Means for solving the problem]

[0012] In order to achieve the above object, the wireless power transmission device of the present invention arranges an induction coil around a power transmission coil, which is generally located on the ground side when supplying power to an electric vehicle or plug-in hybrid vehicle, and uses the induction coil as a drive coil and connects a cancellation magnetic field generating coil in series with the induction coil around at least a portion of the induction coil, thereby forming a leakage magnetic field canceling coil by the induction coil that serves as the drive coil (hereinafter in this specification and claims, the induction coil that serves as the drive coil will be referred to simply as a "drive induction coil" as appropriate) and the cancellation magnetic field generating coil, and this leakage magnetic field canceling coil reduces the leakage magnetic field from the power transmission coil.

[0013] In addition, the wireless power receiving device according to the present invention has a drive induction coil disposed around a receiving coil, which is generally positioned on the vehicle side when supplying power to an electric vehicle or plug-in hybrid vehicle, and a cancellation magnetic field generating coil connected in series to the driving induction coil around at least a portion of the periphery of the driving induction coil, thereby forming a leakage magnetic field canceling coil by the drive induction coil and the cancellation magnetic field generating coil, and this leakage magnetic field canceling coil reduces the leakage magnetic field from the receiving coil.

[0014] A wireless power supply system according to the present invention includes at least one of the above-described wireless power transmitting device according to the present invention and the wireless power receiving device according to the present invention.

[0015] That is, the wireless power transmission device according to the present invention is a wireless power transmission device that transmits power contactlessly, and has a power transmission coil that transmits power, a driving induction coil arranged around the power transmission coil, and a canceling magnetic field generating coil that surrounds at least a portion of the periphery of the power transmission coil and is connected in series to at least a portion of the driving induction coil, and the driving induction coil and the canceling magnetic field generating coil form a leakage magnetic field canceling coil.

[0016] Furthermore, the wireless power transmission device according to the present invention is the wireless power transmission device according to the present invention described above, wherein the driving induction coil is arranged to have one or more turns so as to surround almost the entire circumference of the power transmission coil, and the canceling magnetic field generating coil is arranged to have one or more turns so as to surround almost the entire circumference of the power transmission coil.

[0017] Furthermore, in the wireless power transmitting device according to the present invention, the driving induction coil has one turn, and the canceling magnetic field generating coil has one turn.

[0018] Furthermore, a wireless power transmitting device according to the present invention is the wireless power transmitting device according to the present invention described above, wherein magnetic materials are disposed in the driving induction coil and the canceling magnetic field generating coil.

[0019] Furthermore, the wireless power transmission device according to the present invention is the wireless power transmission device according to the present invention described above, wherein the canceling magnetic field generating coil is disposed at a height position equal to or higher than the height of the power transmission coil.

[0020] Furthermore, a wireless power transmission device according to the present invention is the wireless power transmission device according to the present invention described above, further comprising a height position adjustment mechanism that adjusts the height position when the canceling magnetic field generating coil is disposed.

[0021] Furthermore, a wireless power transmitting device according to the present invention is the wireless power transmitting device according to the present invention described above, wherein the driving induction coil and the canceling magnetic field generating coil are configured on a printed circuit board.

[0022] In addition, the wireless power receiving device according to the present invention is a wireless power receiving device that receives power contactlessly, and has a receiving coil that receives power, a driving induction coil arranged around the receiving coil, and a canceling magnetic field generating coil connected in series to at least a part of the driving induction coil so as to surround at least a part of the periphery of the receiving coil, and the driving induction coil and the canceling magnetic field generating coil form a leakage magnetic field canceling coil.

[0023] Furthermore, the wireless power receiving device of the present invention is the wireless power receiving device of the present invention described above, wherein the driving induction coil is arranged to have one or more turns distributed so as to surround almost the entire circumference of the power transmitting coil, and the canceling magnetic field generating coil is arranged to have one or more turns distributed so as to surround almost the entire circumference of the power transmitting coil.

[0024] Furthermore, in the wireless power receiving device according to the present invention, in the above-described wireless power receiving device according to the present invention, the driving induction coil has one turn, and the canceling magnetic field generating coil has one turn.

[0025] Furthermore, a wireless power receiving device according to the present invention is the wireless power receiving device according to the present invention described above, wherein magnetic materials are disposed in the driving induction coil and the canceling magnetic field generating coil.

[0026] Furthermore, a wireless power receiving device according to the present invention is the wireless power receiving device according to the present invention described above, in which the driving induction coil and the canceling magnetic field generating coil are configured on a printed circuit board.

[0027] Furthermore, a wireless power supply system according to the present invention is a wireless power supply system that transmits power contactlessly from a wireless power transmitter to a wireless power receiver, and includes the wireless power transmitter according to the present invention described above as the wireless power transmitter.

[0028] Furthermore, a wireless power supply system according to the present invention is a wireless power supply system that transmits power contactlessly from a wireless power transmitter to a wireless power receiver, and includes the wireless power receiver according to the present invention described above as the wireless power receiver.

[0029] Furthermore, a wireless power supply system according to the present invention is a wireless power supply system that transmits power contactlessly from a wireless power transmitting device to a wireless power receiving device, and includes the wireless power transmitting device according to the present invention described above as the wireless power transmitting device, and the wireless power receiving device according to the present invention described above as the wireless power receiving device.

[0030] Furthermore, a wireless power transmission device according to the present invention is a wireless power transmission device that transmits power contactlessly, and includes as a first wireless power transmission device the wireless power transmission device according to the present invention described above, and as a second wireless power transmission device the wireless power transmission device according to the present invention described above that is formed to have an opposite-phase magnetic field to that of the first wireless transmission device, the first wireless power transmission device and the second wireless power transmission device are arranged side by side, the canceling magnetic field generating coil is provided in an area opposite to the side where the power transmission coil and the driving induction coil are adjacent and facing each other in the first wireless power transmission device and the second wireless power transmission device arranged side by side, and the leakage magnetic field canceling coil is formed in each of the above areas.

[0031] Furthermore, a wireless power transmission device according to the present invention is a wireless power transmission device that transmits power contactlessly, and is configured by arranging multiple wireless power transmission devices according to the present invention described above in succession, and when arranging the wireless power transmission devices according to the present invention in succession, the center lines located between the first wireless power transmission device and the second wireless power transmission device are aligned, and the first wireless power transmission devices are in phase with each other, and the second wireless power transmission devices are in phase with each other.

[0032] Furthermore, a wireless power transmission device according to the present invention is a wireless power transmission device that transmits power contactlessly, comprising as a first wireless power transmission device the wireless power transmission device according to the present invention described above, and as a second wireless power transmission device the wireless power transmission device according to the present invention described above formed to have an opposite-phase magnetic field to that of the first wireless transmission device, the first wireless power transmission device and the second wireless power transmission device being arranged side by side, and a canceling magnetic field generating coil being provided in an area other than an area where the power transmission coil and the driving induction coil are adjacent and facing each other in the first wireless power transmission device and the second wireless power transmission device arranged side by side, and the leakage magnetic field canceling coil is formed in each of the other areas.

[0033] Furthermore, a wireless power transmission device according to the present invention is a wireless power transmission device that transmits power contactlessly, comprising: a first wireless power transmission device according to the present invention as described above; a second wireless power transmission device according to the present invention as described above; a third wireless power transmission device according to the present invention as described above; and a fourth wireless power transmission device according to the present invention as described above; wherein the first wireless power transmission device, the second wireless power transmission device, the third wireless power transmission device, and the fourth wireless power transmission device are adjacent to each other. The wireless power transmitting devices are arranged in a checkerboard pattern so that the magnetic fields generated by each device are opposite in phase to each other, and a canceling magnetic field generating coil is provided in an area other than an area where the power transmitting coil and the driving induction coil are adjacent in the first wireless power transmitting device, the second wireless power transmitting device, the third wireless power transmitting device, and the fourth wireless power transmitting device each have the leakage magnetic field canceling coil formed in the other area. [Effects of the Invention]

[0034] As the present invention is configured as described above, it has the excellent effect of being able to provide a wireless power transmitting device, a wireless power receiving device, and a wireless power supply system that are simple in configuration, lightweight, and highly effective in reducing leakage magnetic fields even at positions far from the transmitting coil and the receiving coil. [Brief explanation of the drawings]

[0035] [Figure 1] FIG. 1 is an explanatory diagram that schematically shows the configuration of a wireless power supply system according to an example of an embodiment of the present invention, and schematically shows the cross-sectional configuration taken along line AA in FIG. [Figure 2] FIG. 2 is an explanatory diagram schematically illustrating the configuration of a wireless power transmitting device according to an example of an embodiment of the present invention in the wireless power supply system shown in FIG. 1, and schematically illustrates the configuration in a plan view as viewed from the arrow B in FIG. [Figure 3] FIG. 3 is an explanatory diagram that schematically shows the configuration of a wireless power supply system according to another example of the embodiment of the present invention, and schematically shows the cross-sectional configuration taken along line FF in FIG. [Figure 4] FIG. 4 is an explanatory diagram schematically illustrating the configuration of a wireless power receiving device according to an example embodiment of the present invention in the wireless power supply system shown in FIG. 3, and schematically illustrates the configuration as viewed from the bottom as seen from arrow G in FIG. 3. [Figure 5] FIG. 5 is an explanatory diagram that schematically shows the configuration of a wireless power supply system according to still another example of the embodiment of the present invention, and schematically shows a cross-sectional configuration that corresponds to FIGS. 1 and 3. In FIG. [Figure 6] FIG. 6 is an explanatory diagram showing a schematic diagram of another example of the configuration of the leakage magnetic field canceling coil according to the present invention, and shows a schematic diagram of the configuration in a plan view corresponding to FIG. [Figure 7] FIG. 7 is an explanatory diagram showing a schematic diagram of another example of the configuration of the leakage magnetic field canceling coil according to the present invention, and shows a schematic diagram of the configuration in a plan view corresponding to FIG. [Figure 8]FIG. 8 is an explanatory diagram showing a schematic diagram of another example of the configuration of the leakage magnetic field canceling coil according to the present invention, and shows a schematic diagram of the configuration in a plan view corresponding to FIG. [Figure 9] 9(a), 9(b), and 9(c) are explanatory diagrams showing schematic diagrams of other configuration examples of leakage magnetic field canceling coils according to the present invention, and showing schematic cross-sectional configurations corresponding to those in FIGS. 1 and 3. In FIG. [Figure 10] FIG. 10 is an explanatory diagram that schematically shows another configuration example of a wireless power transmitting device according to the present invention, and schematically shows a cross-sectional configuration corresponding to FIG. [Figure 11] FIG. 11 is an explanatory diagram that schematically shows another configuration example of a wireless power transmitting device according to the present invention, and schematically shows a cross-sectional configuration corresponding to FIG. [Figure 12] FIG. 12 is an explanatory diagram showing a schematic diagram of another example of the configuration of the leakage magnetic field canceling coil according to the present invention, and shows a schematic diagram of the configuration in plan view corresponding to FIG. [Figure 13] 13(a) and 13(b) are explanatory diagrams schematically illustrating a conventional method for combining outputs by arranging two wireless power transmitting devices side by side on the ground so as to create opposite-phase magnetic fields. Note that Fig. 13(a) is an explanatory diagram corresponding to Fig. 2. Also, Fig. 13(b) is an explanatory diagram corresponding to Fig. 1. [Figure 14] FIG. 14 is a graph showing the measurement results of the leakage magnetic field when two wireless power transmission devices are arranged so as to form an in-phase magnetic field, and the leakage magnetic field in the wireless power transmission device shown in FIGS. 13(a) and 13(b). [Figure 15] 15(a) and 15(b) are explanatory diagrams schematically illustrating a wireless power transmitting device configured such that, when two wireless power transmitting devices according to the present invention are arranged side by side on the ground so as to form opposite-phase magnetic fields, a canceling magnetic field generating coil is provided in each region opposite to the side where the power transmitting coils and driving induction coils of the two wireless power transmitting devices according to the present invention arranged side by side face each other, thereby forming a leakage magnetic field canceling coil in that region. Note that Fig. 15(a) is an explanatory diagram corresponding to Fig. 2. Also, Fig. 15(b) is an explanatory diagram corresponding to Fig. 1. [Figure 16] FIG. 16 is a graph showing the measurement results of the leakage magnetic field when two wireless power transmission devices are arranged so as to form an in-phase magnetic field, and the leakage magnetic field in the wireless power transmission device shown in FIGS. 15(a) and 15(b). [Figure 17] Figures 17(a) and 17(b) are explanatory diagrams schematically illustrating a wireless power transmitting device in which a plurality of wireless power transmitting devices, each consisting of a pair of a first wireless power transmitting device and a second wireless power transmitting device that form the opposite-phase magnetic field shown in Figures 15(a) and 15(b), are arranged consecutively. Note that Figure 17(a) is an explanatory diagram corresponding to Figure 2. Also, Figure 17(b) is an explanatory diagram corresponding to Figure 1. [Figure 18] Fig. 18 is an explanatory diagram that schematically shows a wireless power transmitting device configured such that, when two wireless power transmitting devices are arranged side by side on the ground to form an opposite-phase magnetic field, cancellation magnetic field generating coils are provided in areas other than the areas where the power transmitting coils and driving induction coils of the two wireless power transmitting devices arranged side by side face each other, and leakage magnetic field canceling coils are formed in the other areas. Note that Fig. 18 is an explanatory diagram corresponding to Fig. 2. [Figure 19] Fig. 19 is an explanatory diagram that schematically shows a wireless power transmitting device configured such that, when four wireless power transmitting devices are arranged side by side on the ground, they are arranged in a checkerboard pattern so that the magnetic fields generated by adjacent devices are opposite in phase to each other, and cancellation magnetic field generating coils are provided in areas other than the areas where the power transmitting coils and driving induction coils of the four wireless power transmitting devices arranged side by side are adjacent, thereby forming leakage magnetic field canceling coils in these other areas. Note that Fig. 19 is an explanatory diagram corresponding to Fig. 2. DETAILED DESCRIPTION OF THE INVENTION

[0036] Hereinafter, examples of embodiments of a wireless power transmitting device, a wireless power receiving device, and a wireless power supply system according to the present invention will be described in detail with reference to the accompanying drawings.

[0037] In the following description of the "Form for implementing the invention," the same or corresponding configurations and functions will be denoted by the same reference numerals, and detailed descriptions of the configurations and functions will be omitted as appropriate.

[0038] (I) Description of the configuration and operation of a wireless power supply system according to an example embodiment of the present invention and a wireless power transmission device according to an example embodiment of the present invention

[0039] FIG. 1 is an explanatory diagram showing a schematic configuration of a wireless power supply system according to an example of an embodiment of the present invention, and shows a schematic cross-sectional configuration taken along line AA in FIG.

[0040] FIG. 2 is an explanatory diagram showing a schematic configuration of a wireless power transmission device according to an example of an embodiment of the present invention in the wireless power supply system shown in FIG. 1, and shows a schematic planar configuration as seen from the arrow B in FIG. 1.

[0041] A wireless power supply system 10 according to an example of an embodiment of the present invention includes a wireless power transmitting device 20 and a wireless power receiving device 30.

[0042] Here, the wireless power transmitting device 20 is disposed, for example, on a ground surface 40A or a ground surface 40B such as the surface of a parking lot, while the wireless power receiving device 30 is disposed, for example, on the bottom of a vehicle 50 such as an electric vehicle or a plug-in hybrid vehicle.

[0043] Next, the wireless power transmitting device 20 will be described in detail. The wireless power transmitting device 20 is configured to include a power transmitting coil 22 consisting of a planar coil arranged approximately parallel to the ground surface 40A or 40B, a magnetic material 24 such as ferrite arranged on the underside of the power transmitting coil 22 (the side opposite to the side facing the wireless power receiving device 30), a driving induction coil 26 consisting of a planar coil arranged approximately parallel to the ground surface 40A or 40B, and cancellation magnetic field generating coils 28a, 28b, 28c, 28d consisting of planar coils arranged approximately parallel to the ground surface 40A or 40B.

[0044] A capacitor (not shown), an AC power supply (not shown), and the like are connected to the power transmission coil 22. Also, a conductive plate such as an aluminum plate may be placed under the magnetic material 24 in some cases.

[0045] Here, the power transmission coil 22 is formed by being wound a plurality of times in a substantially rectangular shape so that the four corners of the rectangular shape are rounded in a plan view.

[0046] The driving induction coil 26 is arranged with one winding (one turn) of the coil so as to surround almost the entire circumference of the power transmission coil 22 along the outermost periphery of the power transmission coil 22 at a predetermined interval from the approximately rectangular long side portion 22a, long side portion 22b and short side portion 22c, short side portion 22d located at the outermost periphery of the power transmission coil 22 in a planar view, and the driving induction coil 26 is also formed in an approximately rectangular shape so that the four corners of the rectangle are rounded in a planar view.

[0047] The above-mentioned predetermined interval is an interval set so that an induced electromotive force is generated in the driving induction coil 26 due to the magnetic field of the current C flowing in the direction of the arrow C in the power transmission coil 22, causing a current D to flow in the driving induction coil 26 in the direction of the arrow D, which is opposite to the direction of the current C.

[0048] A one-turn cancellation magnetic field generating coil 28a, which is formed in a substantially rectangular shape with rounded corners in a plan view, is connected in series to a long side portion 26a of the drive induction coil 26 that faces the long side portion 22a of the power transmission coil 22 and extends along substantially the entire length of the long side portion 26a of the drive induction coil 26. Specifically, a substantially central portion of the long side portion 26a of the drive induction coil 26 is divided, and one end 28a-1 of the one-turn cancellation magnetic field generating coil 28a is connected to one end 26a-1 of the divided portion, and the other end 28a-2 of the one-turn cancellation magnetic field generating coil 28a is connected to the other end 26a-2 of the divided portion. In this way, the drive induction coil 26 and the cancellation magnetic field generating coil 28a are connected in series, and the drive induction coil 26 and the cancellation magnetic field generating coil 28a are connected in a substantially figure-8 shape with no intersections in a plan view.

[0049] Similarly, a one-turn cancellation magnetic field generating coil 28b, which is formed in a substantially rectangular shape with rounded corners in a plan view, is connected in series to a long-side portion 26b of the drive induction coil 26 that faces the long-side portion 22b of the power transmission coil 22 and extends along substantially the entire length of the long-side portion 26b of the drive induction coil 26. Specifically, a substantially central portion of the long-side portion 26b of the drive induction coil 26 is divided, and one end 28b-1 of the one-turn cancellation magnetic field generating coil 28b is connected to one end 26b-1 of the divided portion, and the other end 28b-2 of the one-turn cancellation magnetic field generating coil 28b is connected to the other end 26b-2 of the divided portion. In this way, the drive induction coil 26 and the cancellation magnetic field generating coil 28b are connected in series, and the drive induction coil 26 and the cancellation magnetic field generating coil 28b are connected in a substantially figure-8 shape with no intersections in a plan view.

[0050] Similarly, a one-turn cancellation magnetic field generating coil 28c, which is formed in a substantially rectangular shape with rounded corners in a plan view, is connected in series to a short-side portion 26c of the drive induction coil 26 that faces the short-side portion 22c of the power transmission coil 22 and extends substantially the entire length of the short-side portion 26c of the drive induction coil 26. Specifically, a substantially central portion of the short-side portion 26c of the drive induction coil 26 is divided, and one end 28c-1 of the one-turn cancellation magnetic field generating coil 28c is connected to one end 26c-1 of the divided portion, and the other end 28c-2 of the one-turn cancellation magnetic field generating coil 28c is connected to the other end 26c-2 of the divided portion. In this way, the drive induction coil 26 and the cancellation magnetic field generating coil 28c are connected in series, and the drive induction coil 26 and the cancellation magnetic field generating coil 28c are connected in a substantially figure-8 shape with no intersections in a plan view.

[0051] Similarly, a one-turn cancellation magnetic field generating coil 28d, which is formed in a substantially rectangular shape with rounded corners in a plan view, is connected in series to a short-side portion 26d of the drive induction coil 26 that faces the short-side portion 22d of the power transmission coil 22 and extends substantially the entire length of the short-side portion 26d of the drive induction coil 26. Specifically, a substantially central portion of the short-side portion 26d of the drive induction coil 26 is divided, and one end 28d-1 of the one-turn cancellation magnetic field generating coil 28d is connected to one end 26d-1 of the divided portion, and the other end 28d-2 of the one-turn cancellation magnetic field generating coil 28d is connected to the other end 26d-2 of the divided portion. In this way, the drive induction coil 26 and the cancellation magnetic field generating coil 28d are connected in series, and the drive induction coil 26 and the cancellation magnetic field generating coil 28d are connected in a substantially figure-8 shape with no intersections in a plan view.

[0052] As described above, by connecting one turn of the driving induction coil 26 in series with one turn of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d, respectively, one turn of the leakage magnetic field canceling coil 29 is formed, and the one turn of the leakage magnetic field canceling coil 29 surrounds almost the entire circumference of the power transmitting coil 22.

[0053] Next, the wireless power receiving device 30 will be described in detail. The wireless power receiving device 30 is configured to have a receiving coil 32 consisting of a planar coil arranged approximately parallel to the transmitting coil 22, and a magnetic material 34 such as ferrite arranged on the upper surface side of the receiving coil 32 (the surface opposite to the surface facing the wireless power transmitting device 20).

[0054] Here, the power receiving coil 32 is formed by winding a plurality of turns in a substantially rectangular shape so that the four corners of the rectangular shape are rounded in a plan view.

[0055] The power receiving coil 32 is connected to a rectifier (not shown), a battery (not shown) of the vehicle 50, and the like.

[0056] In the wireless power supply system 10 configured as described above, power can be supplied to the battery of the vehicle 50 by transmitting power from the wireless power transmitter 20 to the wireless power receiver 30 by magnetic field coupling.

[0057] As for the technology for transmitting power from the transmitting coil 22 of the wireless power transmitter 20 to the receiving coil 32 of the wireless power receiver 30 using a magnetic field coupling method to supply power to the battery of the vehicle 50, a conventionally known technology can be applied, so a detailed explanation of this technology will be omitted. Below, the effect of reducing the leakage magnetic field in the wireless power supply system 10 and the wireless power transmitter 20 will be described.

[0058] That is, in the wireless power supply system 10, the magnetic field of the current C flowing in the direction of the arrow C in the power transmission coil 22 of the wireless power transmission device 20 generates an induced electromotive force in the driving induction coil 26 of the leakage magnetic field canceling coil 29, and the current D flows in the direction of the arrow D, which is opposite to the direction of the current C, in the driving induction coil 26.

[0059] The current D flowing through this driving induction coil 26 flows to the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d that are each connected in series to the driving induction coil 26, so that in a planar view, a current E flows in the direction of arrow E, which is opposite to the current C flowing through the power transmission coil 22, in the outer peripheral portions 28a-3, 28b-3, 28c-3, and 28d-3 of the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d, respectively.

[0060] As described above, current E flows in the opposite direction to the current C flowing through the power transmission coil 22 through the outer peripheral portions 28a-3, 28b-3, 28c-3, and 28d-3 of the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d, respectively, and thereby an induced magnetic field is generated in the opposite direction to the induced magnetic field caused by the current C flowing through the power transmission coil 22.

[0061] As shown in Figure 1, the induced magnetic field generated by the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d in this manner, i.e., the induced magnetic field in the opposite direction to the induced magnetic field generated by the power transmission coil 22, cancels the leakage magnetic field of the power transmission coil 22, thereby effectively reducing the leakage magnetic field in a wide area around the power transmission coil 22.

[0062] Moreover, the above-mentioned wireless power transmitting device 20 can be constructed by adding a driving induction coil 26 and cancellation magnetic field generating coils 28a, 28b, 28c, and 28d connected in series to a conventional wireless power transmitting device, so that the configuration is simple and the increase in weight can be suppressed.

[0063] That is, the wireless power transmitter 20 described above has a simple and lightweight configuration, and can effectively reduce leakage magnetic fields even at a position distant from the power transmitting coil 22.

[0064] Furthermore, in the wireless power transmission device 20 described above, a one-turn leakage magnetic field canceling coil 29 is formed by connecting one turn of the driving induction coil 26 and one turn of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d in series. This allows the conductive parts of the leakage magnetic field canceling coil 29 to be structured so that they do not overlap. Therefore, when the leakage magnetic field canceling coil 29 is arranged horizontally or parallel to the ground surface 40A or 40B, it can be formed into a thin structure in the height direction (for example, the direction perpendicular to the horizontal plane or the ground surface), and no short circuit occurs even when pressure is applied in the height direction, making it possible to manufacture the device at low cost with a simple structure.

[0065] (II) Description of the configuration and operation of a wireless power supply system according to another example of an embodiment of the present invention and a wireless power receiving device according to an example of an embodiment of the present invention

[0066] FIG. 3 is an explanatory diagram that schematically shows the configuration of a wireless power supply system according to another embodiment of the present invention, and schematically shows the cross-sectional configuration taken along line FF in FIG.

[0067] FIG. 4 is an explanatory diagram showing a schematic configuration of a wireless power receiving device according to an example embodiment of the present invention in the wireless power supply system shown in FIG. 3, and shows a schematic bottom view of the configuration as seen from the arrow G in FIG. 3.

[0068] A wireless power supply system 100 according to another example of the embodiment of the present invention includes a wireless power transmitting device 120 and a wireless power receiving device 130.

[0069] Here, the wireless power transmitting device 120 is disposed, for example, on a ground surface 40A or a ground surface 40B such as the surface of a parking lot, while the wireless power receiving device 130 is disposed, for example, on the bottom of a vehicle 50 such as an electric vehicle or a plug-in hybrid vehicle.

[0070] Next, the wireless power transmitting device 120 will be described in detail. The wireless power transmitting device 120 is configured to have a power transmitting coil 122 consisting of a planar coil arranged approximately parallel to the ground surface 40A or the ground surface 40B, and a magnetic material 124 such as ferrite arranged on the underside of the power transmitting coil 122 (the surface opposite to the surface facing the wireless power receiving device 130).

[0071] Here, the power transmission coil 122 is formed by being wound multiple times in a substantially rectangular shape so that the four corners of the rectangular shape are rounded in a plan view.

[0072] A capacitor (not shown), an AC power supply (not shown), and the like are connected to the power transmitting coil 22. Also, a conductive plate such as an aluminum plate may be placed under the magnetic material 124 in some cases.

[0073] Next, the wireless power receiving device 130 will be described in detail. The wireless power receiving device 130 is configured to include a receiving coil 132 consisting of a planar coil arranged approximately parallel to the transmitting coil 122, a magnetic material 134 such as ferrite arranged on the upper surface of the receiving coil 132 (the surface opposite to the surface facing the wireless power transmitting device 120), a driving induction coil 136 consisting of a planar coil arranged approximately parallel to the transmitting coil 122, and cancellation magnetic field generating coils 138a, 138b, 138c, and 138d consisting of planar coils arranged approximately parallel to the transmitting coil 122.

[0074] The power receiving coil 132 is connected to a rectifier (not shown), a battery (not shown) of the vehicle 50, and the like.

[0075] Here, the power receiving coil 132 is formed by winding a plurality of turns in a substantially rectangular shape so that the four corners of the rectangular shape are rounded when viewed from the bottom.

[0076] The driving induction coil 136 is arranged with one winding (one turn) of the coil so as to surround almost the entire circumference of the receiving coil 132 along the outermost periphery of the receiving coil 132, with a predetermined distance from the approximately rectangular long side portion 132a, long side portion 132b and short side portion 132c, short side portion 132d located at the outermost periphery of the receiving coil 132 when viewed from the bottom, and the driving induction coil 136 is also formed in an approximately rectangular shape with rounded corners at the four corners of the rectangle when viewed from the bottom.

[0077] The above-mentioned predetermined interval is an interval set so that an induced electromotive force is generated in the driving induction coil 136 due to the magnetic field of the current H flowing in the direction of the arrow H in the receiving coil 132, causing a current I to flow in the driving induction coil 136 in the direction of the arrow I, which is opposite to the direction of the current H.

[0078] A one-turn cancellation magnetic field generating coil 138a, which is formed in a substantially rectangular shape with rounded corners in bottom view, is connected in series to a long-side portion 136a of the driving induction coil 136 that faces the long-side portion 132a of the power receiving coil 132, so as to extend over substantially the entire length of the long-side portion 136a of the driving induction coil 136. Specifically, a substantially central portion of the long-side portion 136a of the driving induction coil 136 is divided, and one end 138a-1 of the one-turn cancellation magnetic field generating coil 138a is connected to one end 136a-1 of the divided portion, and the other end 138a-2 of the one-turn cancellation magnetic field generating coil 138a is connected to the other end 136a-2 of the divided portion. In this way, the driving induction coil 136 and the cancellation magnetic field generating coil 138a are connected in series, and the driving induction coil 136 and the cancellation magnetic field generating coil 138a are connected in an approximately figure-8 shape with no intersections when viewed from the bottom.

[0079] Similarly, a cancel magnetic field generating coil 138b formed in a substantially rectangular shape with rounded corners in bottom view is connected in series for one turn to a long side portion 136b of the drive induction coil 136 that faces the long side portion 132b of the power receiving coil 132, so as to extend over substantially the entire length of the long side portion 136b of the drive induction coil 136. Specifically, a substantially central portion of the long side portion 136b of the drive induction coil 136 is divided, and one end 138b-1 of the one-turn cancel magnetic field generating coil 138b is connected to one end 136b-1 of the divided portion, and the other end 138b-2 of the one-turn cancel magnetic field generating coil 138b is connected to the other end 136b-2 of the divided portion. In this way, the driving induction coil 136 and the cancellation magnetic field generating coil 138b are connected in series, and the driving induction coil 136 and the cancellation magnetic field generating coil 138b are connected in an approximately figure-8 shape with no intersections when viewed from the bottom.

[0080] Similarly, a cancel magnetic field generating coil 138c formed in a substantially rectangular shape with rounded corners in bottom view is connected in series for one turn to a short side portion 136c of the drive induction coil 136 that faces the short side portion 132c of the power receiving coil 132, so as to extend over substantially the entire length of the short side portion 136c of the drive induction coil 136. Specifically, a substantially central portion of the short side portion 136c of the drive induction coil 136 is divided, and one end 138c-1 of the one-turn cancel magnetic field generating coil 138c is connected to one end 136c-1 of the divided portion, and the other end 138c-2 of the one-turn cancel magnetic field generating coil 138c is connected to the other end 136c-2 of the divided portion. In this way, the driving induction coil 136 and the cancellation magnetic field generating coil 138c are connected in series, and the driving induction coil 136 and the cancellation magnetic field generating coil 138c are connected in an approximately figure-8 shape with no intersections when viewed from the bottom.

[0081] Similarly, a cancel magnetic field generating coil 138d formed in a substantially rectangular shape with rounded corners in bottom view is connected in series for one turn to a short side portion 136d of the drive induction coil 136 that faces the short side portion 132d of the power receiving coil 132, so as to extend over substantially the entire length of the short side portion 136d of the drive induction coil 136. Specifically, a substantially central portion of the short side portion 136d of the drive induction coil 136 is divided, and one end 138d-1 of the one-turn cancel magnetic field generating coil 138d is connected to one end 136d-1 of the divided portion, and the other end 138d-2 of the one-turn cancel magnetic field generating coil 138d is connected to the other end 136d-2 of the divided portion. In this way, the driving induction coil 136 and the cancellation magnetic field generating coil 138d are connected in series, and the driving induction coil 136 and the cancellation magnetic field generating coil 138d are connected in an approximately figure-8 shape with no intersections when viewed from the bottom.

[0082] As described above, by connecting one turn of the driving induction coil 136 in series with one turn of the canceling magnetic field generating coils 138a, 138b, 138c, and 138d, respectively, a one turn of the leakage magnetic field canceling coil 139 is formed, and the one turn of the leakage magnetic field canceling coil 139 surrounds almost the entire periphery of the receiving coil 132.

[0083] In the wireless power supply system 100 configured as described above, power can be supplied to the battery of the vehicle 50 by transmitting power from the wireless power transmitter 120 to the wireless power receiver 130 by magnetic field coupling.

[0084] As for the technology for transmitting power from the transmitting coil 122 of the wireless power transmitting device 120 to the receiving coil 132 of the wireless power receiving device 130 using a magnetic field coupling method to supply power to the battery of the vehicle 50, a conventionally known technology can be applied, so a detailed explanation will be omitted. Below, the effect of reducing the leakage magnetic field in the wireless power supply system 10 and the wireless power receiving device 130 will be described.

[0085] That is, in the wireless power supply system 100, the magnetic field of the current H flowing in the receiving coil 132 of the wireless power receiving device 130 generates an induced electromotive force in the driving induction coil 136 of the leakage magnetic field canceling coil 139, and the current I flows in the direction of the arrow I, which is opposite to the current H, in the driving induction coil 136.

[0086] The current I flowing through this driving induction coil 136 flows to the cancellation magnetic field generating coils 138a, 138b, 138c, and 138d that are each connected in series to the driving induction coil 136, so that current J flows in the direction of arrow J, which is opposite to the current H flowing through the receiving coil 132, in the outer peripheral portions 138a-3, 138b-3, 138c-3, and 138d-3 of the cancellation magnetic field generating coils 138a, 138b, 138c, and 138d, respectively, when viewed from the bottom.

[0087] As described above, current J flows in the opposite direction to the current H flowing through the receiving coil 132 through the outer peripheral portions 138a-3, 138b-3, 138c-3, and 138d-3 of the canceling magnetic field generating coils 138a, 138b, 138c, and 138d, respectively, generating an induced magnetic field in the opposite direction to the induced magnetic field caused by the current H flowing through the receiving coil 132.

[0088] As shown in Figure 4, the induced magnetic field generated by the cancellation magnetic field generating coils 138a, 138b, 138c, and 138d in this manner, i.e., the induced magnetic field in the opposite direction to the induced magnetic field generated by the receiving coil 132, cancels the leakage magnetic field of the receiving coil 132, thereby effectively reducing the leakage magnetic field in a wide area around the receiving coil 132.

[0089] Moreover, the above-mentioned wireless power receiving device 130 can be constructed by adding a driving induction coil 136 and cancellation magnetic field generating coils 138a, 138b, 138c, and 138d connected in series to a conventional wireless power receiving device, so that the configuration is simple and the increase in weight can be suppressed.

[0090] That is, the wireless power receiving device 130 described above has a simple and lightweight configuration, and can effectively reduce leakage magnetic fields even at a position distant from the power receiving coil 132.

[0091] Furthermore, in the wireless power receiving device 130 described above, a one-turn leakage magnetic field canceling coil 139 is formed by connecting one turn of the driving induction coil 136 and one turn of the canceling magnetic field generating coils 138a, 138b, 138c, and 138d in series. This allows the conductive parts of the leakage magnetic field canceling coil 139 to be structured so that they do not overlap. Therefore, when the leakage magnetic field canceling coil 139 is arranged horizontally or parallel to the ground surface 40A or 40B, it can be formed into a thin structure in the height direction (for example, a direction perpendicular to the horizontal plane or the ground surface), and no short circuit occurs even when pressure is applied in the height direction, making it possible to manufacture the device at low cost with a simple structure.

[0092] (III) Description of the configuration and operation of a wireless power supply system according to yet another embodiment of the present invention

[0093] FIG. 5 is an explanatory diagram showing a schematic configuration of a wireless power supply system according to yet another embodiment of the present invention, and shows a schematic cross-sectional configuration corresponding to FIGS. 1 and 3.

[0094] A wireless power supply system 200 according to yet another example of the embodiment of the present invention includes the wireless power transmitting device 20 and the wireless power receiving device 130 described above.

[0095] That is, the wireless power supply system 200 includes a wireless power transmitting device 20 according to an example embodiment of the present invention in the wireless power supply system 10, and a wireless power receiving device 130 according to an example embodiment of the present invention in the wireless power supply system 100.

[0096] Therefore, the wireless power supply system 200 can provide a wireless power transmitting device that has a simple and lightweight configuration and is highly effective in reducing leakage magnetic fields even at a position distant from the power transmitting coil 22 and the power receiving coil 132.

[0097] (IV) Description of other embodiments and modifications

[0098] It should be noted that the above-described embodiment is merely an example, and the present invention can be embodied in various other forms. In other words, the present invention is not limited to the above-described embodiment, and various omissions, substitutions, and modifications can be made without departing from the spirit of the present invention.

[0099] For example, the above-described embodiment may be modified as shown in the following (IV-1) to (IV-11).

[0100] (IV-1) In the above-described embodiment, the power transmitting coil 22, the power transmitting coil 122, the power receiving coil 32, the power receiving coil 132, the drive induction coil 26, the drive induction coil 136, the cancellation magnetic field generating coils 28a, 28b, 28c, 28d, and the cancellation magnetic field generating coils 138a, 138b, 138c, 138d are described as planar coils, but this is of course not limiting. That is, the power transmitting coil 22, the power transmitting coil 122, the power receiving coil 32, the power receiving coil 132, the drive induction coil 26, the drive induction coil 136, the cancellation magnetic field generating coils 28a, 28b, 28c, 28d, and the cancellation magnetic field generating coils 138a, 138b, 138c, 138d may be planar coils including planar spiral coils, or may be coils of various other shapes such as spiral coils or solenoid coils.

[0101] (IV-2) In the above-described embodiment, the dividing points are the approximately central portions of the long side portion 26a, the long side portion 26b, the short side portion 26c, and the short side portion 26d of the driving induction coil 26, and the approximately central portions of the long side portion 136a, the long side portion 136b, the short side portion 136c, and the short side portion 136d of the driving induction coil 136, but it goes without saying that the dividing points are not limited to this. That is, the division points in the long side portions 26a, 26b, 26c, and 26d of the driving induction coil 26 may be, for example, the ends of the long side portions 26a, 26b, 26c, and 26d, and the division points in the long side portions 136a, 136b, 136c, and 136d of the driving induction coil 136 may be, for example, the ends of the long side portions 136a, 136b, 136c, and 136d of the long side portions 136a, 136b, 136c, and 136d.

[0102] (IV-3) In the above-described embodiment, one turn of the leakage magnetic field canceling coil 29 is formed by connecting one one-turn driving induction coil 26 in series with four one-turn cancellation magnetic field generating coils 28a, 28b, 28c, and 28d, and one turn of the leakage magnetic field canceling coil 139 is formed by connecting one one-turn driving induction coil 136 in series with four one-turn cancellation magnetic field generating coils 138a, 138b, 138c, and 138d, but it goes without saying that this is not limited to this. For example, one turn of the leakage magnetic field canceling coil may be formed by one one-turn driving induction coil and one one-turn cancellation magnetic field generating coil.

[0103] Here, Figure 6 shows an example of a wireless power transmission device in which a one-turn leakage magnetic field canceling coil is configured using one one-turn driving induction coil and one one-turn canceling magnetic field generating coil, which will be described in detail below.

[0104] In the wireless power transmitting device 300, one turn of the leakage magnetic field canceling coil 309 is formed by one turn of the driving induction coil 306 and one turn of the canceling magnetic field generating coil 308, and this leakage magnetic field canceling coil 309 is arranged so as to surround almost the entire outer periphery of the power transmitting coil 22.

[0105] The driving induction coil 306 is arranged with one winding (one turn) of the coil along the outermost periphery of the power transmission coil 22 at a predetermined interval from the long side portion 22a, the long side portion 22b and the short side portion 22c, the short side portion 22d of the approximately rectangular shape of the power transmission coil 22 in a planar view, and the driving induction coil 306 is also formed in an approximately rectangular shape so that the four corners of the rectangular shape are rounded in a planar view.

[0106] The canceling magnetic field generating coil 308 is arranged in a single stroke along the outer periphery of the driving induction coil 306 so as to surround the outer periphery.

[0107] Next, the connection relationship between the driving induction coil 306 and the cancellation magnetic field generating coil 308 will be explained. One end 306a-1 located approximately in the center of the long side portion 306a of the driving induction coil 306 facing the long side portion 22a is connected via the first connecting conductor 336 to one end 308a-1 located approximately in the center of the long side portion 308a of the cancellation magnetic field generating coil 308 that is adjacent to and faces the long side portion 306a.

[0108] On the other hand, the other end 306a-1 located at approximately the center of the long side portion 306a of the driving induction coil 306 facing the long side portion 22a is connected to the other end 308a-2 located at approximately the center of the long side portion 308a of the cancellation magnetic field generating coil 308 via the second connecting conductor 338.

[0109] The above-mentioned predetermined interval is an interval set so that an induced electromotive force is generated in the driving induction coil 306 due to the magnetic field of the current K flowing in the direction of the arrow K in the power transmission coil 22, causing a current L to flow in the driving induction coil 306 in the direction of the arrow L, which is opposite to the direction of the current K.

[0110] In the above configuration, the magnetic field of current K flowing in power transmission coil 302 of wireless power transmission device 300 generates an induced electromotive force in driving induction coil 306 in leakage magnetic field canceling coil 309, causing current L to flow in the driving induction coil 306 in the opposite direction to current K.

[0111] The current L flowing through this driving induction coil 306 flows to the cancellation magnetic field generating coil 308 connected in series to the driving induction coil 306, so that in a planar view, a current M flows through the cancellation magnetic field generating coil 308 in the direction of arrow M, which is opposite to the direction of the current K flowing through the power transmission coil 302.

[0112] As described above, when current M flows through the canceling magnetic field generating coil 308 in the opposite direction to the current K flowing through the transmitting coil 302, an induced magnetic field is generated in the opposite direction to the induced magnetic field caused by current K flowing through the transmitting coil 302.

[0113] The induced magnetic field generated by the cancellation magnetic field generating coil 308 in this manner, i.e., the induced magnetic field in the opposite direction to the induced magnetic field generated by the power transmission coil 22, cancels the leakage magnetic field of the power transmission coil 22, thereby effectively reducing the leakage magnetic field in a wide area around the power transmission coil 22.

[0114] Furthermore, according to the wireless power transmission device 300, since the entire periphery of the power transmission coil 22, including the four corners of the rectangular shape when viewed in a plane, is surrounded by the cancellation magnetic field generating coil 308, it is possible to effectively reduce the leakage magnetic field around the entire periphery of the power transmission coil 22, including the four corners of the rectangular shape when viewed in a plane.

[0115] Although the leakage magnetic field canceling coil 309 in the wireless power transmitting device 300 has been described above with reference to FIG. 6, it goes without saying that a leakage magnetic field canceling coil can also be formed in a wireless power receiving device in the same manner as the leakage magnetic field canceling coil 309 in the wireless power transmitting device 300.

[0116] (IV-4) In the above-described embodiment, the one-turn leakage magnetic field canceling coil 29 is formed by connecting in series one turn of the drive induction coil 26 and one turn of each of the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d, and the one-turn leakage magnetic field canceling coil 139 is formed by connecting in series one turn of the drive induction coil 136 and one turn of each of the cancellation magnetic field generating coils 138a, 138b, 138c, and 138d, but this is not of course limited to this. That is, the drive induction coil 26 and the drive induction coil 136 may each have two or more turns, and the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d and the cancellation magnetic field generating coils 138a, 138b, 138c, and 138d may each have two or more turns, thereby forming the leakage magnetic field canceling coil 29 and the leakage magnetic field canceling coil 139.

[0117] Here, Figure 7 shows an example of a wireless power transmission device 20 in which the driving induction heating coil 26 is configured with three turns, the cancellation magnetic field generating coil 28a and the cancellation magnetic field generating coil 28b connected in series to the opposing long side portions 26a and 26b of the driving induction heating coil 26 where the magnetic field cancellation strength is to be increased are each configured with three turns, and the cancellation magnetic field generating coil 28c and the cancellation magnetic field generating coil 28d connected in series to the opposing short side portions 26c and 26d of the driving induction heating coil 26 are each configured with two turns.

[0118] The strength of the canceling magnetic field can be increased by increasing the number of turns, i.e., the number of windings, of the driving induction heating coil 26 and the number of turns, i.e., the number of windings, of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d. Therefore, by appropriately selecting these numbers of turns (number of windings), it becomes possible to adjust the strength of the canceling magnetic field, and at the same time, it becomes possible to adjust the strength of the canceling magnetic field for each direction of the transmitting coil 22.

[0119] Note that, in the above, the driving induction heating coil 26 and the canceling magnetic field generating coils 28a, 28b, 28c, and 28d in the wireless power transmitting device 20 have been described with reference to FIG. 7, but it goes without saying that in the wireless power receiving device 130, as in the wireless power transmitting device 20, the canceling magnetic field strength can be adjusted by adjusting the number of turns, i.e., the number of windings, of the driving induction heating coil 136 and the number of turns, i.e., the number of windings, of the canceling magnetic field generating coils 138a, 138b, 138c, and 138d.

[0120] (IV-5) In the above-described embodiment, the power transmitting coil 22 and the power receiving coil 132 are surrounded almost entirely by the canceling magnetic field generating coils 28a, 28b, 28c, and 28d and the canceling magnetic field generating coils 138a, 138b, 138c, and 138d, respectively, but it goes without saying that the present invention is not limited to this.

[0121] For example, the magnetic field leakage strength is generally strong at short side portions 22c and 22d of power transmission coil 22 and short side portions 132c and 132d of power reception coil 132, which are located in the vehicle width direction of vehicle 50.

[0122] For this reason, for example, as shown in FIG. 8, canceling magnetic field generating coils 28c and 28d may be arranged only in areas facing short side portions 22c and 22d of power transmitting coil 22 in wireless power transmitting device 20.

[0123] That is, the canceling magnetic field generating coil does not necessarily have to be arranged so as to surround substantially the entire circumference of the power transmitting coil or power receiving coil, but may be selectively arranged only in a partial area where the magnetic field leakage strength is strong.

[0124] Although the above description has been given with reference to FIG. 8 regarding the wireless power transmitting device 20, it goes without saying that the wireless power receiving device 130 may also have the canceling magnetic field generating coil selectively arranged in only a partial area, similar to the wireless power transmitting device 20.

[0125] (IV-6) Although detailed explanations have been omitted in the above-described embodiments, in order to increase the canceling magnetic field strength (strengthen the canceling magnetic field strength) produced by the leakage magnetic field canceling coil 29 and the leakage magnetic field canceling coil 139, a magnetic material such as ferrite may be arranged adjacent to the leakage magnetic field canceling coil 29 and the leakage magnetic field canceling coil 139.

[0126] For example, as shown in FIG. 9(a), a magnetic material 400 such as ferrite may be disposed adjacent to the leakage magnetic field canceling coil 29 by disposing the magnetic material 400 such as ferrite on the underside of the power transmitting coil 22 (the side opposite to the side facing the wireless power receiving device 30) of the driving induction coil 26 and the canceling magnetic field generating coils 28a, 28b, 28c, 28d.

[0127] Furthermore, as shown in FIG. 9(b), by arranging a magnetic material 402 such as ferrite on the upper surface side (the surface opposite to the surface facing the wireless power transmitting device 20) of the power receiving coil 132 in the driving induction coil 136 and the cancellation magnetic field generating coils 138a, 138b, 138c, 138d, the magnetic material 402 such as ferrite may be arranged adjacent to the leakage magnetic field canceling coil 139.

[0128] Furthermore, as shown in FIG. 9(c), a magnetic material 400 such as ferrite may be arranged on the lower surface side (the surface opposite to the surface facing the wireless power receiving device 30) of the power transmitting coil 22 in the driving induction coil 26 and the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d, and a magnetic material 402 such as ferrite may be arranged on the upper surface side (the surface opposite to the surface facing the wireless power transmitting device 20) of the power receiving coil 132 in the driving induction coil 136 and the cancellation magnetic field generating coils 138a, 138b, 138c, and 138d, so that the magnetic material 400 such as ferrite is arranged adjacent to the leakage magnetic field canceling coil 29 and the magnetic material 402 such as ferrite is arranged adjacent to the leakage magnetic field canceling coil 139.

[0129] (IV-7) Although detailed explanation is omitted in the above-described embodiment, in the wireless power transmitting device 20 that is to be disposed on the ground surface 40A, such as the surface of a parking lot, the height positions of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d from the ground surface 40A when they are disposed may be changed as appropriate.

[0130] For example, as shown in FIG. 10, the height positions of the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d from the ground surface 40A may be set to a height H1 that is lower than the height position of the power transmission coil 22 from the ground surface 40A, or may be set to a height H2 that is higher than the height position of the power transmission coil 22 from the ground surface 40A.

[0131] That is, in the wireless power transmission device 20, the power transmission coil 22 may be installed so as to be buried in the ground, and in this case, it is preferable to place the cancellation magnetic field generating coils 28a, 28b, 28c, and 28d at a height above the power transmission coil 22 at the same height or higher to cancel the leakage magnetic field.

[0132] 10, for convenience of drawing, the height position of the drive induction coil 26 is shown at the same height position as the height positions of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d from the ground surface 40A. However, it goes without saying that the height position of the drive induction coil 26 does not necessarily have to be the same height position as the height positions of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d from the ground surface 40A.

[0133] (IV-8) Although detailed description has been omitted in the above-described embodiment, wireless power transmitting device 20 that will be disposed on ground surface 40A, such as the surface of a parking lot, may be provided with a height position adjustment mechanism for adjusting the height positions of cancellation magnetic field generating coils 28a, 28b, 28c, and 28d from ground surface 40A.

[0134] As a height position adjustment mechanism, for example, as shown in FIG. 11, the canceling magnetic field generating coils 28a, 28b, 28c, and 28d may be placed on a mounting base 504 of a height adjustment jig 500, which moves the height direction of the mounting base 504 up and down by rotating a screw 502, and the height direction of the mounting base 504 may be moved up and down by appropriately rotating the screw 502, thereby adjusting the height positions of the canceling magnetic field generating coils 28a, 28b, 28c, and 28d from the ground surface 40A.

[0135] In other words, the height position of the cancellation magnetic field generating coil has a large effect on canceling the leakage magnetic field. Therefore, by providing a height position adjustment mechanism for the cancellation magnetic field generating coil, the height of the cancellation magnetic field generating coil can be adjusted while measuring the leakage magnetic field strength.

[0136] (IV-9) Although detailed explanations have been omitted in the above-described embodiment, as shown in FIG. 12, the driving induction coil and the cancellation magnetic field generating coil may be configured on a printed circuit board, so that the leakage magnetic field canceling coil is also configured on a printed circuit board.

[0137] (IV-10) Although detailed explanations have been omitted in the above-described embodiment, the wireless power transmitting device 20, which is generally installed on the ground when supplying power to an electric vehicle or a plug-in hybrid vehicle, may be installed in multiple units instead of just one.

[0138] Specifically, for example, two wireless power transmitting devices 20 formed to have opposite-phase magnetic fields may be arranged side by side on the ground to combine their outputs.

[0139] When two wireless power transmitters 20 formed to have opposite phase magnetic fields are arranged side by side on the ground, for example, as will be described in detail later with reference to Figures 15(a) and 15(b), a cancellation magnetic field generating coil may be provided only on one side of each of the two wireless power transmitters 20 arranged side by side, which is the area opposite to the side where the power transmission coil 22 and the driving induction coil 26 are adjacent and facing each other, so that a leakage magnetic field canceling coil 29 is formed only on one side of that area.

[0140] Incidentally, a technique for combining outputs by arranging two wireless power transmission devices formed to have opposite-phase magnetic fields side by side on the ground has been known, for example, as shown in Japanese Patent Application Laid-Open No. 2016-5393.

[0141] Figures 13(a) and (b) are explanatory diagrams that show a schematic diagram of a conventional technique for combining outputs by arranging two wireless power transmission devices side by side on the ground so that they form opposite-phase magnetic fields.

[0142] That is, a wireless power transmitter 600 shown in FIGS. 13(a) and 13(b) includes a first wireless power transmitter 601 and a second wireless power transmitter 602, which are two wireless power transmitters that form opposite-phase magnetic fields.

[0143] The first wireless power transmitter 601 and the second wireless power transmitter 602 correspond to the wireless power transmitter 20 from which the driving induction coil 26 and the canceling magnetic field generating coils 28a, 28b, 28c, and 28d have been removed.

[0144] Above the first wireless power transmitting apparatus 601 and the second wireless power transmitting apparatus 602, wireless power receiving apparatuses 30 are disposed, respectively, to combine the outputs.

[0145] The magnetic field generated by current 601A flowing in the direction of arrow 601A in first wireless power transmitting device 601 and the magnetic field generated by current 602A flowing in the direction of arrow 602A in second wireless power transmitting device 602 are opposite in phase to each other.

[0146] That is, the first wireless power transmitting device 601 and the second wireless power transmitting device 602 are arranged adjacent to each other so as to have opposite phase magnetic fields.

[0147] Here, Figure 14 shows graphs illustrating the measurement results of the leakage magnetic field when two wireless power transmission devices are arranged so as to form an in-phase magnetic field, and the leakage magnetic field in the wireless power transmission device shown in Figures 13(a) and (b).

[0148] During the measurement, the center position between two wireless power transmitting devices arranged side by side, for example, in the case of wireless power transmitting device 600, the center position between first wireless power transmitting device 601 and second wireless power transmitting device 602, was set as the origin of the XYZ Cartesian coordinate system, and the leakage magnetic field was measured at a point 3 m away from the origin in both the x and y directions.

[0149] As shown in Figure 14, compared to when two wireless power transmission devices are arranged to create an in-phase magnetic field, the wireless power transmission device 600 in which the first wireless power transmission device 601 and the second wireless power transmission device 602 are arranged to create an out-of-phase magnetic field has reduced leakage magnetic fields in both the x and y directions.

[0150] However, even in the wireless power transmitting device 600 in which the first wireless power transmitting device 601 and the second wireless power transmitting device 602 are arranged so as to form an opposite-phase magnetic field, the reduction effect in the x direction is lower than that in the y direction, and it has been desired to further reduce the leakage magnetic field in the x direction.

[0151] 15(a) and 15(b) are explanatory diagrams that schematically show a wireless power transmission device 700 configured such that, when two wireless power transmission devices 20 formed to have an opposite-phase magnetic field are arranged side by side on the ground, a cancellation magnetic field generating coil is provided only on one side of each of the two wireless power transmission devices 20 arranged side by side, which is the area opposite to the side where the power transmission coil 22 and the driving induction coil 26 are adjacently facing each other, and a leakage magnetic field canceling coil 29 is formed only on one side of that area.

[0152] Specifically, the wireless power transmitting device 700 has a wireless power transmitting device 20 (hereinafter, for ease of explanation, referred to as the "first wireless power transmitting device 20-1") whose magnetic field direction is caused by a current 20A flowing in the direction of the arrow 20A, and a wireless power transmitting device 20 (hereinafter, for ease of explanation, referred to as the "second wireless power transmitting device 20-2") whose magnetic field direction is caused by a current 20B flowing in the direction of the arrow 20B, arranged side by side.

[0153] That is, the wireless power transmitter 700 includes two wireless power transmitters, a first wireless power transmitter 20-1 and a second wireless power transmitter 20-2, which form opposite-phase magnetic fields.

[0154] The first wireless power transmitter 20-1 and the second wireless power transmitter 20-2 are provided with a canceling magnetic field generating coil only on the side in the region opposite to the side where the power transmitting coil 22 and the driving induction coil 26 are adjacent and facing each other.

[0155] That is, referring to FIG. 2, the first wireless power transmitting device 20-1 has only the cancellation magnetic field generating coil 28a as the cancellation magnetic field generating coil, and the driving induction coil 26 and the cancellation magnetic field generating coil 28a form the leakage magnetic field canceling coil 29.

[0156] Similarly, referring to FIG. 2, the second wireless power transmitting device 20-2 has only the cancellation magnetic field generating coil 28b as the cancellation magnetic field generating coil, and the driving induction coil 26 and the cancellation magnetic field generating coil 28b form the leakage magnetic field canceling coil 29.

[0157] Here, FIG. 16 shows graphs illustrating the measurement results of the leakage magnetic field when two wireless power transmission devices 20 are arranged so as to form an in-phase magnetic field, and the leakage magnetic field in the wireless power transmission device 700 shown in FIGS. 15(a) and (b).

[0158] According to the measurement results shown in FIG. 16, compared to the measurement results shown in FIG. 14, the leakage magnetic field in the x direction is reduced by about 3 db.

[0159] During the measurement, as in the case of FIG. 14, the center position between two wireless power transmitters 20 arranged side by side, for example, in the case of wireless power transmitter 700, the center position between first wireless power transmitter 20-1 and second wireless power transmitter 20-2, was set as the origin of the XYZ Cartesian coordinate system, and the leakage magnetic field was measured at a point 3 m away from the origin in each of the x and y directions.

[0160] According to the measurement results shown in FIG. 14, the leakage magnetic field in the y direction is also reduced in the wireless power transmitting device 600, and therefore the reduction of the leakage magnetic field in the y direction is not taken into consideration for the wireless power transmitting device 700.

[0161] Next, Figures 17(a) and (b) show explanatory diagrams that schematically show a wireless power transmission device 800 in which multiple wireless power transmission devices 700 are arranged in succession, each of which is made up of a pair of a first wireless power transmission device 20-1 and a second wireless power transmission device 20-2 that form the opposite-phase magnetic field shown in Figures 15(a) and (b).

[0162] When multiple wireless power transmission devices 700 are arranged in succession, the wireless power transmission device 800 is arranged on the ground side so that the center line CL located between the wireless power transmission device 20-1 and the wireless power transmission device 20-2 is aligned, and the wireless power transmission devices 20-1 are in phase with each other and the wireless power transmission devices 20-2 are in phase with each other.

[0163] Such a wireless power transmitting device 800 has a configuration suitable for use when supplying power to an EV while it is running.

[0164] As described above, the wireless power transmitting device 800 has a number of wireless power transmitting devices 700 arranged consecutively on the ground side, each of which is made up of a pair of wireless power transmitting devices 20-1 and 20-2 that form opposite-phase magnetic fields as shown in Figures 15(a) and 15(b).

[0165] On the other hand, the wireless power receiving device 30 is disposed under the body of the vehicle 50 so as to face in the vertical direction the pair of wireless power transmitting devices 20-1 and 20-2 which form the opposite-phase magnetic fields shown in Figures 15(a) and (b).

[0166] Therefore, by having the vehicle 50 travel over the wireless power transmitting device 800 installed on the ground, power can be continuously supplied to the vehicle 50, and the leakage magnetic field around the EV can be reduced over a wide range.

[0167] Furthermore, Figure 18 shows an explanatory diagram that schematically illustrates a wireless power transmission device 900 configured in such a way that, unlike the configuration of the wireless power transmission device 700 shown in Figures 15(a) and (b), when two wireless power transmission devices 20 formed to have an opposite-phase magnetic field are arranged side by side on the ground, cancellation magnetic field generating coils are provided on three sides, i.e., areas on which the power transmission coil 22 and the driving induction coil 26 of the two wireless power transmission devices 20 arranged side by side are adjacent and facing each other, except for one side, i.e., an area on the side where the power transmission coil 22 and the driving induction coil 26 are adjacent and facing each other, and leakage magnetic field canceling coils 29 are formed on the three sides, i.e., other areas.

[0168] Specifically, the wireless power transmitting device 900 has a wireless power transmitting device 20 (hereinafter, for ease of explanation, referred to as the "first wireless power transmitting device 20-3") whose magnetic field direction is caused by a current 20C flowing in the direction of the arrow 20C, and a wireless power transmitting device 20 (hereinafter, for ease of explanation, referred to as the "second wireless power transmitting device 20-4") whose magnetic field direction is caused by a current 20D flowing in the direction of the arrow 20D, arranged side by side.

[0169] The first wireless power transmitting device 20-3 and the second wireless power transmitting device 20-4 do not have cancellation magnetic field generating coils on the sides of the area where their respective power transmitting coils 22 and driving induction coils 26 are adjacent and facing each other, but have cancellation magnetic field generating coils on three sides of the other area excluding that side area.

[0170] That is, referring to FIG. 2, the first wireless power transmitting device 20-3 is provided with cancellation magnetic field generating coils 28a, 28c, and 28d as cancellation magnetic field generating coils, and the driving induction coil 26 and the cancellation magnetic field generating coils 28a, 28c, and 28d form a leakage magnetic field canceling coil 29.

[0171] Similarly, referring to FIG. 2, the second wireless power transmitting device 20-4 is provided with cancellation magnetic field generating coils 28b, 28c, and 28d as cancellation magnetic field generating coils, and the driving induction coil 26 and the cancellation magnetic field generating coils 28b, 28c, and 28d form a leakage magnetic field canceling coil 29.

[0172] According to the wireless power transmitting device 900 configured in this manner, the effect of reducing the leakage magnetic field can be further strengthened not only in the x direction but also in the y direction.

[0173] Furthermore, Figure 19 shows an explanatory diagram that schematically shows a wireless power transmission device 1000 configured such that, when four wireless power transmission devices 20 are arranged side by side on the ground, they are arranged in a checkerboard pattern so that the magnetic fields generated by adjacent devices are opposite in phase to each other, and cancellation magnetic field generating coils are provided on two sides of the other areas except for the two sides where the power transmission coils 22 and driving induction coils 26 of the four wireless power transmission devices 20 arranged side by side are adjacent, and leakage magnetic field canceling coils 29 are formed on the two sides of the other areas.

[0174] Specifically, in the wireless power transmitting device 1000, a first wireless power transmitting device 20 (hereinafter, for convenience of explanation, referred to as "first wireless power transmitting device 20-5") is disposed in the upper left region constituting the checkered pattern in FIG. 19, where the direction of the magnetic field is due to a current 20E flowing in the direction of an arrow 20E, and a second wireless power transmitting device 20 (hereinafter, for convenience of explanation, referred to as "second wireless power transmitting device 20-6") is disposed in the upper right region constituting the checkered pattern in FIG. 19, where the direction of the magnetic field is due to a current 20F flowing in the direction of an arrow 20F. 19, a third wireless power transmitting device 20 (hereinafter, for convenience of explanation, referred to as "third wireless power transmitting device 20-7") whose magnetic field direction is caused by current 20G flowing in the direction of arrow 20G is arranged in the lower right region constituting the checkered pattern in FIG. 19, and a fourth wireless power transmitting device 20 (hereinafter, for convenience of explanation, referred to as "fourth wireless power transmitting device 20-8") whose magnetic field direction is caused by current 20H flowing in the direction of arrow 20H is arranged in the lower left region constituting the checkered pattern in FIG.

[0175] The first wireless power transmitter 20-5, the second wireless power transmitter 20-6, the third wireless power transmitter 20-7, and the fourth wireless power transmitter 20-8 are provided with canceling magnetic field generating coils on two sides other than the side adjacent to the power transmitting coil 22 and the driving induction coil 26.

[0176] That is, referring to FIG. 2, the first wireless power transmitting device 20-5 is provided with cancellation magnetic field generating coils 28a and 28d as cancellation magnetic field generating coils, and the driving induction coil 26 and the cancellation magnetic field generating coils 28a and 28d form a leakage magnetic field canceling coil 29.

[0177] Similarly, referring to FIG. 2, the second wireless power transmitting device 20-6 is provided with cancellation magnetic field generating coils 28b and 28d as cancellation magnetic field generating coils, and the driving induction coil 26 and the cancellation magnetic field generating coils 28b and 28d form a leakage magnetic field canceling coil 29.

[0178] Furthermore, referring to FIG. 2, the third wireless power transmitting device 20-7 is provided with cancellation magnetic field generating coils 28b and 28c as cancellation magnetic field generating coils, and the driving induction coil 26 and the cancellation magnetic field generating coils 28b and 28c form a leakage magnetic field canceling coil 29.

[0179] Furthermore, referring to FIG. 2, the fourth wireless power transmitting device 20-8 is provided with cancellation magnetic field generating coils 28a and 28c as cancellation magnetic field generating coils, and the driving induction coil 26 and the cancellation magnetic field generating coils 28ab and 28c form a leakage magnetic field canceling coil 29.

[0180] According to the wireless power transmitting device 1000 configured as described above, it is possible to reduce the leakage magnetic field in the x direction and the y direction over a wide range.

[0181] (IV-11) Of course, the above-described embodiments and the embodiments shown in (IV-1) to (IV-10) above may be combined as appropriate. [Industrial Applicability]

[0182] The present invention can be used to supply power to various power supply targets, such as batteries mounted on electric vehicles and plug-in hybrid vehicles. [Explanation of symbols]

[0183] 10 Wireless power supply system 20 Wireless power transmission device 20-1 First wireless power transmitter (first wireless power transmitter) 20-2 Second wireless power transmitter (second wireless power transmitter) 20-3 First wireless power transmitter (first wireless power transmitter) 20-4 Second wireless power transmitting device (second wireless power transmitting device) 20-5 First wireless power transmitter (first wireless power transmitter) 20-6 Second wireless power transmitting device (second wireless power transmitting device) 20-7 Third wireless power transmitting device (third wireless power transmitting device) 20-8 Fourth wireless power transmitter (fourth wireless power transmitter) 22 Transmission coil 22a, 22b Long side part 22c, 22d Short side area 24 Magnetic materials 26 Driving induction coil 26a Long side part 26a-1 One end 26a-2 The other end 26b Long side part 26b-1 One end 26b-2 The other end 26c Short side part 26c-1 One end 26c-2 The other end 26d Short side area 26d-1 One end 26d-2 The other end 28a Cancellation magnetic field generating coil 28a-1 One end 28a-2 The other end 28a-3 Outer area 28b Cancellation magnetic field generating coil 28b-1 One end 28b-2 The other end 28b-3 Outer area 28c Cancellation magnetic field generating coil 28c-1 One end 28c-2 The other end 28c-3 Outer area 28d Cancellation magnetic field generating coil 28d-1 One end 28d-2 Other end 28d-3 Peripheral part 29 Leakage magnetic field canceling coil 30 Wireless power receiving device 32 receiving coil 34 Magnetic materials 40A Ground surface 40B Ground surface 50 vehicles 100 Wireless Power Supply System 120 Wireless power transmission device 122 Transmission coil 124 Magnetic materials 130 Wireless power receiving device 132 receiving coil 132a, 132b Long side part 132c, 132d Short side area 134 Magnetic materials 136 Driving induction coil 136a Long side part 136a-1 One end 136a-2 The other end 136b Long side part 136b-1 One end 136b-2 Other end 136c Short side part 136c-1 One end 136c-2 Other end 136d Short side area 136d-1 One end 136d-2 Other end 138a Cancellation magnetic field generating coil 138a-1 One end 138a-2 The other end 138a-3 Peripheral part 138b Cancellation magnetic field generating coil 138b-1 One end 138b-2 Other end 138b-3 Peripheral part 138c Cancellation magnetic field generating coil 138c-1 One end 138c-2 Other end 138c-3 Outer area 138d Cancellation magnetic field generating coil 138d-1 One end 138d-2 Other end 138d-3 Peripheral part 139 Leakage magnetic field canceling coil 200 Wireless Power Supply System 300 Wireless Power Supply System 306 Driving induction coil 306a Long side part 306a-1 One end 306a-2 The other end 308 Cancellation magnetic field generating coil 308a Long side part 308a-1 One end 308a-2 The other end 309 Leakage magnetic field cancellation coil 336 First connecting conductor 338 Second connecting conductor 400 Magnetic material 402 Magnetic materials 500 Height adjustment jig 502 Screw 504 Mounting table 600 Wireless Power Transmission Device 601 First wireless power transmission device 602 Second wireless power transmitting device 700 Wireless Power Transmission Device 800 Wireless Power Transmission Device 900 Wireless Power Transmission Device 1000 Wireless Power Transmission Device

Claims

1. In a wireless power transmission device that transmits power contactlessly, a power transmission coil for transmitting power; a driving induction coil disposed around the power transmission coil; a canceling magnetic field generating coil connected in series to at least a part of the driving induction coil so as to surround at least a part of the periphery of the power transmitting coil; and The driving induction coil and the canceling magnetic field generating coil form a leakage magnetic field canceling coil. A wireless power transmission device characterized by:

2. The wireless power transmitting device according to claim 1 , The driving induction coil is provided with one or more turns so as to surround substantially the entire circumference of the power transmission coil, The canceling magnetic field generating coil is provided with one or more turns so as to surround substantially the entire circumference of the power transmitting coil. A wireless power transmission device characterized by:

3. The wireless power transmitting device according to claim 2, The driving induction coil has one turn, The canceling magnetic field generating coil has one turn. A wireless power transmission device characterized by:

4. The wireless power transmitting device according to claim 1 , A magnetic material is disposed in the driving induction coil and the canceling magnetic field generating coil. A wireless power transmission device characterized by:

5. The wireless power transmitting device according to claim 1 , The canceling magnetic field generating coil is disposed at a height position equal to or higher than the height of the power transmitting coil. A wireless power transmission device characterized by:

6. The wireless power transmitting device according to claim 1, further comprising: A height position adjustment mechanism is provided to adjust the height position when the canceling magnetic field generating coil is disposed. A wireless power transmission device characterized by:

7. The wireless power transmitting device according to claim 1 , The driving induction coil and the canceling magnetic field generating coil are configured on a printed circuit board. A wireless power transmission device characterized by:

8. In a wireless power receiving device that receives power contactlessly, a receiving coil that receives power; a driving induction coil disposed around the power receiving coil; a canceling magnetic field generating coil connected in series to at least a part of the driving induction coil so as to surround at least a part of the periphery of the power receiving coil; and The driving induction coil and the canceling magnetic field generating coil form a leakage magnetic field canceling coil. A wireless power receiving device characterized by:

9. 9. The wireless power receiving device according to claim 8, The driving induction coil is provided with one or more turns so as to surround substantially the entire circumference of the power transmission coil, The canceling magnetic field generating coil is provided with one or more turns so as to surround substantially the entire circumference of the power transmitting coil. A wireless power receiving device characterized by:

10. The wireless power transmitting device according to claim 9, The driving induction coil has one turn, The canceling magnetic field generating coil has one turn. A wireless power receiving device characterized by:

11. 9. The wireless power receiving device according to claim 8, A magnetic material is disposed in the driving induction coil and the canceling magnetic field generating coil. A wireless power receiving device characterized by:

12. 9. The wireless power receiving device according to claim 8, The driving induction coil and the canceling magnetic field generating coil are configured on a printed circuit board. A wireless power receiving device characterized by:

13. In a wireless power transfer system that transmits power from a wireless power transmitter to a wireless power receiver in a non-contact manner, A wireless power transmission device according to any one of claims 1 to 7 is provided. A wireless power supply system characterized by:

14. In a wireless power transfer system that transmits power from a wireless power transmitter to a wireless power receiver in a non-contact manner, A wireless power receiving device according to any one of claims 8, 9, 10, 11 and 12 is provided as the wireless power receiving device. A wireless power supply system characterized by:

15. In a wireless power transfer system that transmits power from a wireless power transmitter to a wireless power receiver in a non-contact manner, a wireless power transmission device according to any one of claims 1, 2, 3, 4, 5, 6, and 7; A wireless power receiving device according to any one of claims 8, 9, 10, 11 and 12 is provided as the wireless power receiving device. A wireless power supply system characterized by:

16. In a wireless power transmission device that transmits power contactlessly, a first wireless power transmission device comprising the wireless power transmission device according to claim 1; a second wireless power transmission device according to claim 1, which is formed to have a magnetic field in a reverse phase to that of the first wireless transmission device; the first wireless power transmitter and the second wireless power transmitter are arranged side by side, the canceling magnetic field generating coil is provided in a region opposite to a side where the power transmitting coil and the driving induction coil are adjacently opposed to each other in the first wireless power transmitting device and the second wireless power transmitting device arranged side by side, The first wireless power transmitting device and the second wireless power transmitting device each have the leakage magnetic field canceling coil formed in the region. A wireless power transmission device characterized by:

17. In a wireless power transmission device that transmits power contactlessly, A plurality of wireless power transmitting devices according to claim 16 are arranged consecutively, When the wireless power transmission devices according to claim 16 are arranged consecutively, the center lines located between the first wireless power transmission device and the second wireless power transmission device are aligned, and the first wireless power transmission devices are arranged in phase with each other, and the second wireless power transmission devices are arranged in phase with each other. A wireless power transmission device characterized by:

18. In a wireless power transmission device that transmits power contactlessly, a first wireless power transmission device comprising the wireless power transmission device according to claim 1; a second wireless power transmission device according to claim 1, which is formed to have a magnetic field in a reverse phase to that of the first wireless transmission device; the first wireless power transmitter and the second wireless power transmitter are arranged side by side, a canceling magnetic field generating coil is provided in an area other than an area on a side where the power transmitting coil and the driving induction coil are adjacently opposed to each other in the first wireless power transmitting device and the second wireless power transmitting device arranged side by side; The first wireless power transmitting device and the second wireless power transmitting device each have the leakage magnetic field canceling coil formed in the other region. A wireless power transmission device characterized by:

19. In a wireless power transmission device that transmits power contactlessly, a first wireless power transmission device comprising the wireless power transmission device according to claim 1; a second wireless power transmission device comprising the wireless power transmission device according to claim 1; a third wireless power transmission device comprising the wireless power transmission device according to claim 1; A fourth wireless power transmission device includes the wireless power transmission device according to claim 1, the first wireless power transmitter, the second wireless power transmitter, the third wireless power transmitter, and the fourth wireless power transmitter are arranged in a checkerboard pattern such that adjacent ones generate magnetic fields that are opposite in phase to each other; a canceling magnetic field generating coil is provided in an area other than an area where the power transmitting coil and the driving induction coil are adjacent in the first wireless power transmitting device, the second wireless power transmitting device, the third wireless power transmitting device, and the fourth wireless power transmitting device arranged side by side; The first wireless power transmitting device, the second wireless power transmitting device, the third wireless power transmitting device, and the fourth wireless power transmitting device each form the leakage magnetic field canceling coil in the other region. A wireless power transmission device characterized by:

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