Abstract: Example wirelessly powered unmanned aerial vehicles and tracks for providing wireless power are described herein. An example apparatus includes a track section having a transmitter coil to generate an alternating magnetic field and an unmanned aerial vehicle having a receiver coil. The alternating magnetic field induces an alternating current in the receiver coil when the unmanned aerial vehicle is disposed in the alternating magnetic field.

Abstract: Systems and methods may provide for a wireless charging device having a concave-shaped charging platform defining a charging area. The wireless charging device may include a three-dimensional transmitter coil, and at least one additional transmitter coil having a non-uniform spacing within the concave-shaped charging platform to reduce magnetic field variations associated with the three-dimensional transmitter coil.

Abstract: Techniques for coil configuration in a wireless power transmitter in a system, method, and apparatus are described herein. An apparatus for coil configuration in a wireless power transmitter may include a transmitting coil comprising an inner portion and an outer portion, and a switch configured to initiate current on the inner portion based on a detected condition.

Abstract: In a wireless charging device that includes a resonator having coil windings, a magnetic field can be generated by the resonator. The wireless charging device can include a feed point connected to an inner winding of the coil windings of the resonator. The resonator can inductively couple with a power receiving unit such that the an outer winding of the coil windings limit Eddy current generation in one or more conductive surfaces positioned adjacent to the power receiving unit. The feed point can be selectively connected to the inner winding of the coil in a first mode of operation and the outer winding of the coil in a second mode of operation. The inner winding can have a larger current than the outer winding.

Abstract: Example wirelessly powered unmanned aerial vehicles and tracks for providing wireless power are described herein. An example apparatus includes a track section having a transmitter coil to generate an alternating magnetic field and an unmanned aerial vehicle having a receiver coil. The alternating magnetic field induces an alternating current in the receiver coil when the unmanned aerial vehicle is disposed in the alternating magnetic field.

Abstract: Example wirelessly powered unmanned aerial vehicles and tracks for providing wireless power are described herein. An example apparatus includes a track section having a transmitter coil to generate an alternating magnetic field and an unmanned aerial vehicle having a receiver coil. The alternating magnetic field induces an alternating current in the receiver coil when the unmanned aerial vehicle is disposed in the alternating magnetic field.

Abstract: Techniques for coil configuration in a wireless power transmitter in a system, method, and apparatus are described herein. An apparatus for coil configuration in a wireless power transmitter may include a transmitting coil comprising an inner portion and an outer portion, and a switch configured to initiate current on the inner portion based on a detected condition.

Abstract: In a wireless charging device that includes a resonator having coil windings, a magnetic field can be generated by the resonator. The wireless charging device can include a feed point connected to an inner winding of the coil windings of the resonator. The resonator can inductively couple with a power receiving unit such that the an outer winding of the coil windings limit Eddy current generation in one or more conductive surfaces positioned adjacent to the power receiving unit. The feed point can be selectively connected to the inner winding of the coil in a first mode of operation and the outer winding of the coil in a second mode of operation. The inner winding can have a larger current than the outer winding.

Abstract: Techniques for modifying the electrical current distribution of transmit coil of a wireless power transmitting unit are described. An example power transmitting unit includes a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area. The power transmitting unit can also include a power source to transmit an alternating electrical current to an input terminal of the transmit coil and a plurality of reactive elements placed in series with the transmit coil. In some examples, the plurality of reactive elements attach to the transmit coil at least a quarter of a turn from the input terminal. The power transmitting unit can also include a controller to modify a reactance value of the reactive elements to adjust a current distribution of the transmit coil in response to detecting a characteristic of a power receiving unit.

Abstract: Methods, apparatus, systems and articles of manufacture to wirelessly power an unmanned aerial vehicle are disclosed. An example unmanned aerial vehicle (UAV) includes a first electrode assembly to capacitively couple to a first power cable. The example UAV includes a second electrode assembly to capacitively couple to a second power cable. The first and second electrode assemblies, when capacitively coupled to the respective first and second power cables, are to receive power from at least one of the first and second power cables. The example UAV includes a power storage circuit to store the received power.

Abstract: Techniques for focusing the energy radiated by a wireless power transmitting unit are described. An example power transmitting unit includes a transmitter coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area. The power transmitting unit also includes a power generating circuitry to deliver current to the transmitter coil to generate the magnetic field. The power transmitting unit also includes a shield disposed around the transmitter coil to reduce the strength of the magnetic field outside of the active wireless charging area.

Abstract: Systems and methods may provide for a wireless charging device having a concave-shaped charging platform defining a charging area. The wireless charging device may include a three-dimensional transmitter coil, and at least one additional transmitter coil having a non-uniform spacing within the concave-shaped charging platform to reduce magnetic field variations associated with the three-dimensional transmitter coil.

Abstract: An apparatus is described. The apparatus includes a transmission coil and a power amplifier. The power amplifier includes a microcontroller and a memory. The memory includes instructions to determine electric current output of the power amplifier, perform a lookup of load reactance range based on target electric current, detect load impedance, calculate reactance based on the load impedance, determine if reactance is within the load reactance range, and adjust reactance shift compensation to bring the reactance within the load reactance range if the reactance is not within the load reactance range.

Abstract: Techniques for wireless charging in a system, method, and apparatus are described herein. For example, the apparatus includes a first wireless power receiving coil configured to receive power from a first wireless power transmitting coil of a wireless charger. The apparatus also includes a second wireless power transmitting coil coupled to the first wireless power receiving coil, wherein the second wireless power transmitting coil is configured to propagate current resulting in a magnetic field.

Abstract: The disclosure generally relates to a method and apparatus for wireless charging station. In one embodiment, the disclosure provides an overlapping (or tiled) layout of a plurality of coils. Each coil may have a symmetric or an asymmetric turn layout. The disclosure also provides design optimization techniques configured to determine the optimal tile overlap distance and/or coil size to provide a substantially uniform electro-magnetic field over the surface of the wireless charging station.

Abstract: Techniques for wireless transmitting power are described. An example power transmitting unit includes a magnetic resonance-type transmit coil array comprising a plurality of coil elements, wherein each coil element is tuned to a same resonant frequency. The power transmitting unit also includes a power generating circuitry to deliver current to the transmit coil array to wirelessly power a device within an active wireless charging area of at least one of the plurality of coil elements. Each coil element exhibits a plurality of zero point distances and the spacing between neighboring coil elements corresponds with the plurality of zero point distances.

Abstract: A wireless power transfer device and method including a first coil of wire having a first winding to receive electrical current and emit a first electromagnetic field, a second coil of wire having a second winding to receive electrical current and emit a second electromagnetic field, the second electromagnetic field weaker than the first electromagnetic field. A combined electromagnetic field of the first electromagnetic field and the second electromagnetic field to transmit power wirelessly through a first external surface of the wireless power transfer device to a receiving device, and decay faster over distance through a second external surface of the wireless power transfer device than through the first external surface.

Abstract: Example wirelessly powered unmanned aerial vehicles and tracks for providing wireless power are described herein. An example apparatus includes a track section having a transmitter coil to generate an alternating magnetic field and an unmanned aerial vehicle having a receiver coil. The alternating magnetic field induces an alternating current in the receiver coil when the unmanned aerial vehicle is disposed in the alternating magnetic field.

Abstract: Techniques for coil configuration in a wireless power transmitter in a system, method, and apparatus are described herein. An apparatus for coil configuration in a wireless power transmitter may include a transmitting coil comprising an inner portion and an outer portion, and a switch configured to initiate current on the inner portion based on a detected condition.

Abstract: A wireless power transfer device and method including a first coil of wire having a first winding to receive electrical current and emit a first electromagnetic field, a second coil of wire having a second winding to receive electrical current and emit a second electromagnetic field, the second electromagnetic field weaker than the first electromagnetic field. A combined electromagnetic field of the first electromagnetic field and the second electromagnetic field to transmit power wirelessly through a first external surface of the wireless power transfer device to a receiving device, and decay faster over distance through a second external surface of the wireless power transfer device than through the first external surface.