One example discloses a near-field communications device, including: an energy harvesting circuit configured to be coupled to a near-field antenna that is responsive to non-propagating quasi-static near-field energy; wherein the harvesting circuit is configured to harvest energy from the non-propagating quasi-static near-field energy; and wherein the harvesting circuit includes a harvesting filter configured to input a first set of near-field energy and output a second set of near-field energy; and wherein the second set of near-field energy is a sub-set of the first set of near-field energy.

A wireless laser power transfer system includes, in part, a transmitter and a receiver that form a wireless link. The transmitter, includes, in part, a first communication system, at least a first source of laser beam, and a controller adapted to vary power and direction of the laser beam and further to modulate the laser beam. The receiver includes, in part, a communication system adapted to establish a wireless link with the first communication system, at least a first photo-voltaic cell, and a controller adapted to demodulate and detect the power of the modulated laser beam received by the first photo-voltaic cell from the first source of laser beam. The system optionally includes at least a second source of laser beam controlled by the transmitter controller. The system optionally further includes a second photo-voltaic cell. The transmitter controller is further adapted to cause the second laser beam to strike the second photo-voltaic cell.

A battery case has first and second coils on opposing sides of a battery and has switching circuitry that is coupled between the first and second coils. The battery case has a battery that provides supplemental battery power wirelessly to a wireless power receiving device via the second coil when the switching circuitry is in an open state. The case can also receive power wirelessly with the first coil from a wireless charging mat when the switching circuitry is in the open state. In a closed state, the switching circuitry shorts the first and second coils together so that current flowing through the first coil flows through the second coil in series and so that wireless power from the wireless charging mat that is received with the first coil is transmitted wirelessly to the wireless power receiving device using the second coil.

A wireless power relaying device and a display system that distributes power wirelessly. A wireless power relaying device includes a relay coil producing a second magnetic field by a current induced from a first magnetic field produced from a first external device, and a magnetic body on which the relay coil is arranged. The magnetic body includes first, second, and third magnetic bodies arranged at a same distance from each other. A direction in which the relay coil is wound around the first magnetic body is different from a direction in which the relay coil is wound around the second and third magnetic bodies. The direction in which the relay coil is wound around the second coil is the same as the direction in which the relay coil is wound around the third coil. A power signal is sent to a second external device through the second magnetic field.

A wireless power relaying device and a display system that distributes power wirelessly. A wireless power relaying device includes a relay coil producing a second magnetic field by a current induced from a first magnetic field produced from a first external device, and a magnetic body on which the relay coil is arranged. The magnetic body includes first, second, and third magnetic bodies arranged at a same distance from each other. A direction in which the relay coil is wound around the first magnetic body is different from a direction in which the relay coil is wound around the second and third magnetic bodies. The direction in which the relay coil is wound around the second coil is the same as the direction in which the relay coil is wound around the third coil. A power signal is sent to a second external device through the second magnetic field.

A driving device is easily handled at the start and end of charging. A housing cup which includes a bottom surface portion on which at least one driving device including a power-receiving device is placed and a side face portion extending outward from the peripheral edge portion of the bottom surface portion and is formed so that an upper peripheral edge portion of the side face portion is an opening portion, and a magnetic field formation device which is configured to generate a variable magnetic field at a housing region surrounded by the bottom surface portion and the side face portion to allow the power-receiving device to receive power irrespective of the direction and position of the power-receiving device are provided.

A voltage detection circuit includes an inductor connected to connection portions configured to input an alternating-current voltage, an inductor magnetic-field coupled to the inductor, a capacitor connected in parallel to the inductor and constituting a secondary-side resonant circuit with the inductor, and a voltage detector configured to detect an output voltage from the secondary-side resonant circuit. Therefore, a voltage detection circuit, a power transmission device, and a power transmission system capable of detecting an alternating-current voltage with high detection sensitivity irrespective of the potential of a power transmission line are provided.

The technology described herein is directed to wireless power chargers with integrated power receiving facilities. Indeed, embodiments of the present disclosure describe systems, methods, and apparatuses for implementing wireless power chargers with integrated power receiving facilities. In some implementations, a portable wireless power charging apparatus is disclosed. The portable wireless power charging apparatus includes one or more antennas configured to wirelessly receive directed wireless power from a wireless power transmission system via a first radiative wireless power transfer technology in a multipath wireless power delivery environment. The portable wireless power charging apparatus further includes a wireless power receiver configured to convert the wireless power received via the first radiative wireless power transfer technology to direct current (DC) power, and a wireless power transmitter configured to wirelessly transmit the DC power to a portable electronic device via a nonradiative wireless power transfer technology.

In a first radio frequency (RF) device, circuits determine a non-line-of-sight (NLOS) radio path, and select a first plurality of reflector devices associated with the NLOS radio path from a second plurality of reflector devices. The first plurality of reflector devices, are selected based on a first set of criteria, includes an active reflector device and a passive reflector device, and are controlled to transmit a plurality of RF signals to a second RF device based on a second set of criteria. The second RF device is associated with electronic devices. The first RF signal interferes with a second RF signal of the RF signals. A first type of signal associated with the plurality of RF signals is converted to a second type of signal at the second RF device, and the second type of signal is transmitted by the second RF device to the one or more electronic devices.

In a first radio frequency (RF) device, circuits determine a non-line-of-sight (NLOS) radio path, and select a first plurality of reflector devices associated with the NLOS radio path from a second plurality of reflector devices. The first plurality of reflector devices, are selected based on a first set of criteria, includes an active reflector device and a passive reflector device, and are controlled to transmit a plurality of RF signals to a second RF device based on a second set of criteria. The second RF device is associated with electronic devices. The first RF signal interferes with a second RF signal of the RF signals. A first type of signal associated with the plurality of RF signals is converted to a second type of signal at the second RF device, and the second type of signal is transmitted by the second RF device to the one or more electronic devices.