Abstract:
A power transmission device having a surface a part of which defines a power transmission plane. The device includes: a power transmission coil structure including 2N planar coils laminated in a perpendicular direction to the power transmission plane and wirelessly transmitting AC power to a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane; and a magnetic substance disposed on a side of the power transmission coil opposite from the power transmission plane, wherein the 2N planer coils constitute coil groups including a coil group in which an i'th closest planar coil to the power transmission plane out of the 2N planar coils and the i'th-closest planar coil to the magnetic substance out of the 2N planar coils are connected in series, and the coil groups are connected in parallel to each other.
Abstract:
A power transmitter includes: a first power transmission electrode having a flat surface; a second power transmission electrode that is spaced from the first power transmission electrode in a direction along the surface of the first power transmission electrode and has a flat surface; a power transmission circuit that is electrically connected to the first and second power transmission electrodes and outputs AC power to the first and second power transmission electrodes; a first conductive shield that is disposed between the first and second power transmission electrodes, the first conductive shield being spaced from each of the first and second power transmission electrodes; and at least one second conductive shield that is spaced from the first and second power transmission electrodes in a direction perpendicular to the surface of the first power transmission electrode and covers at least one of a first gap and a second gap, the first gap being disposed between the first power transmission electrode and the first shield, the second gap being disposed between the second power transmission electrode and the first shield.
Abstract:
In an embodiment, a wireless power transmission system includes at least one of the following combinations: i) a transmission-side series resonance circuit including the first coil and a first capacitor disposed between the first coil and a power transmission circuit, and ii) a transmission-side parallel resonance circuit including the second coil and a second capacitor disposed between the second coil and the two power transmission electrodes, and a combination of i) a reception-side parallel resonance circuit including a third coil and a third capacitor disposed between the third coil and two power reception electrodes, and ii) a reception-side series resonance circuit including a fourth coil and a fourth capacitor disposed between the fourth coil and a power reception circuit.
Abstract:
An electric power transmission device includes a first power transmitting electrode, a second power transmitting electrode, a conductive first shield disposed between the first power transmitting electrode and the second power transmitting electrode, a conductive second shield that covers at least one of a first gap between the first power transmitting electrode and the first shield or a second gap between the second power transmitting electrode and the first shield, and a conductive third shield that covers at least one of a plurality of gaps between a plurality of divided portions of the second shield.
Abstract:
A power transmission device having a surface a part of which defines a power transmission plane, the device includes: a power transmission circuit converting DC power into AC power; and a power transmission coil structure including 2N planar coils laminated in a direction which is perpendicular to the power transmission plane, the power transmission coil structure wirelessly transmitting the converted AC power to a power receiving coil of a power receiving device via the power transmission plane and being disposed on a side toward the power transmission plane in the power transmission device. The 2N planer coils constitute coil groups including a coil group in which a planar coil having an i'th highest inductance out of the 2N planar coils and a planar coil having an i'th-lowest inductance are connected in series and the coil groups are connected in parallel to each other.