Power transmission device, power reception device, and wireless power supply system

A wireless power supply system in which high-frequency power is wirelessly provided from a power transmission device to a power reception device, the power transmission device including a power transmission coil, the power reception device including a power reception coil at least magnetic-field coupled to the power transmission coil,

• the power transmission coil having a coil aperture, and
• the power transmission device including a power transmission circuit connected to the power transmission coil, a conductive or magnetic power-transmission-coil near member opposed to the coil aperture of the power transmission coil and having a planar or curved surface portion, an eddy current caused by a magnetic field based on an operation of the wireless power supply system being allowed to flow in the power-transmission-coil near member, and a repeating coil arranged on a side opposite to a side on which the power-transmission-coil near member is arranged with respect to the power transmission coil and coupled to the power transmission coil at least via a magnetic field,
• wherein when a distance between the power transmission coil and the power-transmission-coil near member is expressed as dt1 and a distance between the power transmission coil and the repeating coil is expressed as dt2, dt2≤dt1.

A wireless power supply system in which high-frequency power is wirelessly provided from a power transmission device to a power reception device, the power transmission device including a power transmission coil, the power reception device including a power reception coil at least magnetic-field coupled to the power transmission coil,

• the power transmission coil having a coil aperture, and
• the power transmission device including a power transmission circuit connected to the power transmission coil, a casing housing the power transmission coil and having an inner surface opposed to the coil aperture of the power transmission coil and an outer surface on a back side of the inner surface, and a repeating coil arranged on a side opposite to the inner surface of the casing with respect to the power transmission coil and coupled to the power transmission coil at least via a magnetic field,
• wherein when a distance between the power transmission coil and the outer surface of the casing is expressed as dt1′ and a distance between the power transmission coil and the repeating coil is expressed as dt2, dt2≤dt1′.

A wireless power supply system in which high-frequency power is wirelessly provided from a power transmission device to a power reception device, the power transmission device including a power transmission coil, the power reception device including a power reception coil at least magnetic-field coupled to the power transmission coil,

• the power reception coil having a coil aperture,
• the power reception device including a power reception circuit connected to the power transmission coil, a conductive or magnetic power-reception-coil near member opposed to the coil aperture of the power reception coil and having a planar or curved surface portion, an eddy current caused by a magnetic field based on an operation of the wireless power supply system being allowed to flow in the power-reception-coil near member, and a repeating coil arranged on a side opposite to a side on which the power-reception-coil near member is arranged with respect to the power reception coil and coupled to the power reception coil at least via a magnetic field,
• wherein when a distance between the power reception coil and the power-reception-coil near member is expressed as dr1 and a distance between the power reception coil and the repeating coil is expressed as dr2, dr2≤dr1.

A wireless power supply system in which high-frequency power is wirelessly provided from a power transmission device to a power reception device, the power transmission device including a power transmission coil, the power reception device including a power reception coil at least magnetic-field coupled to the power transmission coil,

• the power reception coil having a coil aperture, and
• the power reception device including a power reception circuit connected to the power transmission coil, a casing housing the power reception coil and having an inner surface opposed to the coil aperture of the power reception coil and an outer surface on a back side of the inner surface, and a repeating coil arranged on a side opposite to the inner surface of the casing with respect to the power reception coil and coupled to the power reception coil at least via a magnetic field,
• wherein when a distance between the power reception coil and the outer surface of the casing is expressed as dr1′ and a distance between the power reception coil and the repeating coil is expressed as dr2, dr2≤dr1′.