Abstract:
A power transmission device according to one embodiment, includes a first power transmission resonator configured to wirelessly transmits power; a second power transmission resonator configured to wirelessly transmits power; a first power supply configured to output AC power to the first power transmission resonator; and a second power supply configured to output AC power having a frequency different from that of the first power supply to the second power transmission resonator. An operating band of the first power transmission resonator includes the frequency of the first power supply and does not include the frequency of the second power supply. An operating band of the second power transmission resonator does not include the frequency of the first power supply and includes the frequency of the second power supply.
Abstract:
According to one embodiment, an antenna apparatus includes a waveguide is formed one or more first array elements and one or more second array element, each of the one or more first array elements being formed at a position where a coupling power ratio is no less than a threshold and including a first slot and at least one reflection suppressing element which suppresses a reflection from the first slot, each of the one or more second array elements being formed at a position where the coupling power ratio is less than the threshold and including a second slot and a third slot, the coupling power ratio indicating a ratio of an electric power supplied to each of the first and second array element to an electric power of electromagnetic wave radiated from the each of the first and second array element.
Abstract:
According to an embodiment, there is provided a resonator including: a first magnetic material core, a first winding and a first protruding portion. The first magnetic material core includes at least one first core block of magnetic material. The first winding is wound around the first magnetic material core. The first protruding portion is formed so as to protrude from a part of the core block between a first end of the core block and the first winding.
Abstract:
According to one embodiment, an inductor includes a magnetic substance core, a coil, a cast case and a cast resin. The coil is wound around the magnetic substance core. The cast case has a body at least partially formed from conductive substance, stores the magnetic substance core and the coil. The cast resin that is formed from a first resin which is an insulator, is located within the cast case, covering the magnetic substance core and the coil.
Abstract:
A power transmitting apparatus including a power supply to generate AC power; a power transmitting inductor to transfer the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus; a mutual coupling adjusting unit to adjust a relative position between the power transmitting inductor and the power receiving inductor; and a control unit to control the mutual coupling adjusting unit based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor. The control unit controls the mutual coupling adjusting unit so that the mutual coupling coefficient falls within a predetermined range and an upper limit of the predetermined range is a value less than a maximum of the mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.
Abstract:
In one embodiment, a power transmission system includes a power transmission apparatus having a power source unit supplying a high-frequency power, and a power transmission inductor including a magnetic core and a winding wire portion and wirelessly transmitting the high-frequency power from the power source unit to a power reception apparatus by mutual inductance, and an electromagnetic wave leakage prevention device including one conductive loop or a plurality of conductive loops disposed at predetermined intervals. The power transmission apparatus is disposed in the loop(s). A winding direction of the loop(s) is not perpendicular to a winding direction of the winding wire portion.
Abstract:
According to one embodiment, a power transmission device includes: a power transmitter, a frequency control circuit and a voltage control circuit. The power transmitter transmits AC power by causing a coil to generate a magnetic field in response to AC power and coupling the magnetic field to a coil of a power receiver. The frequency control circuit sweeps a frequency of the AC power during the power transmission. The voltage control circuit controls a voltage of the AC power, based on a target condition of a ratio between a voltage of power received by the power receiver and a voltage of the AC power.
Abstract:
According to one embodiment, a mobile machine includes a mobile body and a plurality of power transmission resonators. The mobile body is capable of being tilted in a particular direction such that a distance between a particular part opposed to a travel surface and the travel surface is reduced. The plurality of power transmission resonators are arranged at portions of the particular part of the mobile body, heights of the portions with reference to the travel surface being approximately identical with each other in a state of the mobile body being tilted.
Abstract:
According to one embodiment, there is provided a wireless power transmission device a magnetic core; a coil wound around the magnetic core; and at least one capacitor connected to the coil, wherein a notched part is formed at a part different from a part around which the coil is wound in the magnetic core, and the capacitor is arranged at the notched part or is arranged so as to be opposed to the notched part.
Abstract:
There is provided a power transmitting apparatus including: a power supply, a power transmitting inductor, a mutual coupling adjusting unit and a control unit, in which the power supply supplies AC power, the power transmitting inductor transfers the AC power to a power receiving apparatus through magnetic coupling with a power receiving inductor in the power receiving apparatus, the mutual coupling adjusting unit adjusts a relative position between the power transmitting inductor and the power receiving inductor, and the control unit controls the mutual coupling adjusting unit, based on a mutual coupling coefficient between the power transmitting inductor and the power receiving inductor.