Abstract: According to one embodiment, a power feeding system includes power receiving units, communication units, and a power feeding unit. The power feeding unit is configured to stop feeding power to a first power receiving unit when the receiving level is lower than a first reference value, feed power to a second power receiving unit, stop feeding power to the second power receiving unit, and resume feeding power to the first power receiving unit.

Abstract: A power reception apparatus includes: a power receiver to receive wireless power; a switching rectifier circuit including rectifiers with different power conversion characteristics and configured to rectify received power using a target rectifier selected from among them; a detector configured to detect output voltage or output power of the target rectifier; a power converter configured to control the output voltage of the target rectifier; a storage battery configured to be charged with or discharge output power of the power converter; and a controller configured to estimate the received power based on (i) the output voltage and information indicating a relationship between input power and output voltage of the target rectifier, or (ii) the output power and information indicating a relationship between input power and output power of the target rectifier. The controller further controls operations of the switching rectifier circuit and the power converter based on the estimated received power.

Abstract: According to one embodiment, a power transmission device according to this embodiment includes: a receiver that receives a signal from a power receiving device via a plurality of antennas; a controller that detects a plurality of directions of arrival of the signal by performing direction-of-arrival estimation based on the received signal, and selects one of the directions of arrival; and a transmitter that performs transmission beamforming of a power signal with directivity toward the selected direction of arrival.

Abstract: A power receiver apparatus includes an antenna unit, a power reception circuit, a rectifier circuit, and a transmission circuit. The antenna unit includes, on a first face, one or more first antennas that receive radio waves from an outside, and two or more second antennas that transmit the radio waves to the outside. The power reception circuit is connected to the first antennas, and receives a power signal via the one or more first antennas. The rectifier circuit rectifies the power signal received by the power reception circuit. The transmission circuit is connected to the second antennas, and transmits a wireless signal via the second antennas. The first face of the antenna unit includes a first region, and a second region that is at least a portion of a region surrounding the first region, and the second antennas are present in the second region.

Abstract: According to one embodiment, a wireless power supply device includes: a receiver configured to receive a first signal from a power reception device via a plurality of antennas; and a controller configured to determine a plurality of weights used for the plurality of antennas based on a reception signal of the first signal, wherein the receiver receives a second signal from the power reception device by reception beam forming based on the plurality of weights, the controller determines transmission power of a power signal to be transmitted to the power reception device based on reception power of the second signal, and the wireless power supply device further comprises a transmitter configured to transmit the power signal based on the transmission power by transmission beam forming based on the plurality of weights.

Abstract: According to one embodiment, an electronic apparatus capable of transferring power wirelessly to a power receiver apparatus, apparatus includes: a signal generation circuitry configured to generate a first signal for wireless power transfer; an antenna configured to radiate an electromagnetic wave on a basis of the first signal; an actuator capable of mechanically changing an orientation of the antenna; and a controlling circuitry configured to control a transmission power of the first signal according to the orientation of the antenna.

Abstract: According to one embodiment, a power feeding system includes power receiving units, communication units, and a power feeding unit. The power feeding unit is configured to stop feeding power to a first power receiving unit when the receiving level is lower than a first reference value, feed power to a second power receiving unit, stop feeding power to the second power receiving unit, and resume feeding power to the first power receiving unit.

Abstract: An electronic apparatus, according to one embodiment, that is capable of wireless power transfer to a power receiver that transmits a wireless signal, comprising: N antenna elements; N wireless signal processing circuitries configured to acquire analog signals, based on wireless signals received by the N antenna elements; a first signal processing circuitry configured to acquire a first digital signal, based on a first analog signal that is the analog signal acquired by a first wireless signal processing circuitry; a first selector configured to select one of second analog signals that are the analog signals acquired by (N?1) second wireless signal processing circuitries; a second signal processing circuitry configured to acquire a second digital signal, based on the second analog signal selected by the first selector; and a controller configured to estimate a channel from the power receiver, based on the first digital signal and the second digital signal.

Abstract: According to one embodiment, a power supply device includes a receiving unit and a power transmitting unit. The receiving unit receives, from a control device, a first control signal including first information that designates a first power receiving device of a plurality of power receiving devices. The power transmitting unit transmits a wireless power transmission signal for power supply to the first power receiving device, based on the first information. The first control signal is a signal which causes the first power receiving device to perform a specific operation.

Abstract: A power supply system includes a first power supply apparatus configured to perform power transmission by an electromagnetic wave having a first frequency band, and a second power supply apparatus configured to perform power transmission by an electromagnetic wave having a second frequency band. The first power supply apparatus and the second power supply apparatus are provided so as to be 2H×{tan(?)} or greater distant from each other, when each of the first power supply apparatus and the second power supply apparatus is provided in height H from a floor surface, where H is a positive number, and when a direction of a maximum value ±3 dB is in a range from ?? to +? in a case where a perpendicular downward direction from each position is a standard.

Abstract: According to one embodiment, a wireless power reception device, includes: a power receiver circuit configured to receive RF power by separating the RF power into first RF power derived from a first linear polarization component and second RF power derived from a second linear polarization component; a first converter circuit configured to convert the first RF power into first DC power; a second converter circuit configured to convert the second RF power into second DC power; a combiner circuit configured to combine the first DC power and the second DC power in parallel, and output the combined DC power as third DC power; and a voltage fixer circuit configured to fix an output voltage of the combiner to a predetermined value, wherein the first converter and the second converter operate to maximize power conversion efficiencies of the first converter and the second converter, respectively.

Abstract: According to one embodiment, a power reception device, includes: a power receiver circuit configured to receive a wireless signal including at least one of a wireless power supply signal or a wireless communication signal; and a processing circuit configured to determine whether the wireless signal includes the wireless power supply signal or not from a feature value of the wireless signal.

Abstract: A wireless power transmission device that transmits wireless power by a radio wave to a plurality of power receivers, has a power transmission condition calculator that calculates power transmission conditions including power transmission periods of two or more of a plurality of different power transmission patterns based on receiving power information and required electric energy information from the plurality of power receivers, and power transmission circuitry that transmits a radio wave while switching between the two or more power transmission patterns under the calculated power transmission conditions.

Abstract: According to one embodiment, an electronic apparatus capable of transferring power wirelessly to a power receiver apparatus, apparatus includes: a signal generation circuitry configured to generate a first signal 5 for wireless power transfer; an antenna configured to radiate an electromagnetic wave on a basis of the first signal; an actuator capable of mechanically changing an orientation of the antenna; and a controlling circuitry configured to control a transmission power of the first signal according to the orientation of the antenna.

Abstract: An electronic apparatus, according to one embodiment, that is capable of wireless power transfer to a power receiver that transmits a wireless signal, comprising: N antenna elements; N wireless signal processing circuitries configured to acquire analog signals, based on wireless signals received by the N antenna elements; a first signal processing circuitry configured to acquire a first digital signal, based on a first analog signal that is the analog signal acquired by a first wireless signal processing circuitry; a first selector configured to select one of second analog signals that are the analog signals acquired by (N?1) second wireless signal processing circuitries; a second signal processing circuitry configured to acquire a second digital signal, based on the second analog signal selected by the first selector; and a controller configured to estimate a channel from the power receiver, based on the first digital signal and the second digital signal.

Abstract: A wireless power-transmission apparatus includes at least one antenna element disposed at a specific position in a three-dimensional space having a predetermined shape and size, to transmit a power transmission beam, an acquirer to acquire an inclination angle of the antenna element to a plane direction of a reference plane and a height of the antenna element to the reference plane, and a controller to control at least one of antenna power and a power transmission direction of the power transmission beam so that interference power of the power transmission beam toward an outside of the three-dimensional space becomes equal to or smaller than a predetermined allowable value when the antenna element is disposed at the acquired inclination angle and height.

Abstract: A power supply system includes a first power supply apparatus configured to perform power transmission by an electromagnetic wave having a first frequency band, and a second power supply apparatus configured to perform power transmission by an electromagnetic wave having a second frequency band. The first power supply apparatus and the second power supply apparatus are provided so as to be 2H×{tan(?)} or greater distant from each other, when each of the first power supply apparatus and the second power supply apparatus is provided in height H from a floor surface, where H is a positive number, and when a direction of a maximum value ±3 dB is in a range from ?? to +? in a case where a perpendicular downward direction from each position is a standard.

Abstract: A power supply system includes a first power supply apparatus configured to perform power transmission by an electromagnetic wave having a first frequency band, and a second power supply apparatus configured to perform power transmission by an electromagnetic wave having a second frequency band. The first power supply apparatus and the second power supply apparatus are provided so as to be 2H×{tan(?)} or greater distant from each other, when each of the first power supply apparatus and the second power supply apparatus is provided in height H from a floor surface, where H is a positive number, and when a direction of a maximum value ±3 dB is in a range from ?? to +? in a case where a perpendicular downward direction from each position is a standard.

Abstract: A wireless power-transmission apparatus includes at least one antenna element disposed at a specific position in a three-dimensional space having a predetermined shape and size, to transmit a power transmission beam, an acquirer to acquire an inclination angle of the antenna element to a plane direction of a reference plane and a height of the antenna element to the reference plane, and a controller to control at least one of antenna power and a power transmission direction of the power transmission beam so that interference power of the power transmission beam toward an outside of the three-dimensional space becomes equal to or smaller than a predetermined allowable value when the antenna element is disposed at the acquired inclination angle and height.

Abstract: According to one embodiment, an wireless power transmission apparatus includes a plurality of antennas, a power transmission circuit, a measuring circuit and a control circuit. The power transmission circuit is configured to transmit a beam of a first wireless signal from the plurality of antennas. The measuring circuit is configured to receive a second wireless signal with the plurality of antennas. The control circuit is configured to: detect an object in a direction of the beam based on the second wireless signal received at a plurality of timings; and change a shape of the beam by controlling at least either an amplitude or a phase of the first wireless signal provided to each antenna of the plurality of antennas.