A receiver coil assembly for a wirelessly rechargeable battery including first and second transverse coils and a third coil encompassing the first and second coils. The receiver coil may be employed in a power receiver of a wirelessly rechargeable battery. Also disclosed is a wirelessly rechargeable battery having a power receiver demountable from an electrochemical cell.

A transformer is capable of suppressing the output voltage difference, and a switched-mode power supply apparatus uses the transformer. A transformer has a core; a primary winding provided in the core; a gap provided in the core at a location where the primary winding is provided; and at least two secondary windings, provided in the core and spaced apart from both sides of the primary winding as well as the gap at an equal distance in a winding axis direction of the primary winding. A switched-mode power supply apparatus has the transformer; a switching element connected to the primary winding of the transformer; and a control circuit configured to control the switching element.

A transformer being capable of reducing cross regulation even in a case where the load is unbalanced and a switched-mode power supply apparatus using the transformer are provided. A transformer T has a core; a primary winding provided in the core; at least two secondary windings provided in the core around a winding axis which is the same as a winding axis of the primary winding; and at least two auxiliary windings provided in the core around a winding axis which is the same as the winding axis of the primary winding; respectively neighboring the secondary windings; and connected in parallel to each other. A switched-mode power supply apparatus has the transformer T; a switching element connected to the primary winding of the transformer T; and a control circuit configured to control the switching element.

Three-axis antenna comprising a magnetic core (10) including protuberances (11) on each corner delimiting an X-axis winding channel (12X) and a Y-axis winding channel (12Y); in X-axis coil (20X) within the X-axis winding channel (12X), comprising two separate and adjacent X-axis partial coils (21X); a Y-axis coil (20Y) within the Y-axis winding channel (12Y), comprising two separate and adjacent Y-axis partial coils (21Y); and a Z-axis coil (20Z) surrounding the magnetic core (10), wherein said magnetic core includes at least one X-axis partition wall (14X) dividing the X-axis winding channel (12X) in two X-axis partial winding channels (13X) wherein the two separate and adjacent Y-axis partial coils (21Y) are housed, and at least one Y-axis partition wall (14Y) dividing the Y-axis winding channel (12Y) in two Y-axis partial winding channels (13Y) wherein the two separate and adjacent Y-axis partial coils (21Y) are housed.

A wireless power system for powering a television includes a source resonator, configured to generate an oscillating magnetic field, and at least one television component attached to at least one device resonator, wherein the at least one device resonator is configured to wirelessly receive power from the source resonator via the oscillating magnetic field when the distance between the source resonator and the at least one device resonator is more than 5 cm, and wherein at least one television component draws at least 10 Watts of power.

A receiver coil assembly for a wirelessly rechargeable battery including first and second transverse coils and a third coil encompassing the first and second coils. The receiver coil may be employed in a power receiver of a wirelessly rechargeable battery. Also disclosed is a wirelessly rechargeable battery having a power receiver demountable from an electrochemical cell.

Wireless energy transfer apparatus include, in at least one aspect, a device resonator configured to supply power for a load by receiving wirelessly transferred power from a source resonator; a temperature sensor positioned to measure a temperature of a component of the apparatus; a tunable component coupled to the device resonator to adjust a resonant frequency of the device resonator, an effective impedance the device resonator, or both; and control circuitry configured to, in response to detecting a temperature condition using the temperature sensor, (i) tune the tunable component to adjust the resonant frequency of the device resonator, the effective impedance of the device resonator, or both, and (ii) signal the source resonator regarding the temperature condition to cause an adjustment of a resonant frequency of the source resonator, a power output of the source resonator, or both.

In one embodiment, a wireless power transfer coil structure comprises a wheel core comprising an annulus portion and at least two spoke portions arranged substantially symmetrically with respect to a geometric center of the annulus portion, the wheel core formed from a magnetic material, and a coil located on an outer surface of the annulus portion of the wheel core. In one embodiment, the wireless power transfer coil structure further comprises at least one solenoidal coil wound around the at least two spoke portions of the wheel core. In one embodiment, the at least one solenoidal coil is wound around one of the at least two spoke portions of the wheel core in a first direction and wound around another of the at least two spoke portions of the wheel core in the first direction. In one embodiment, the at least one solenoidal coil is wound around one of the at least two spoke portions of the wheel core in a first direction and wound around another of the at least two spoke portions of the wheel core in a second direction different from the first direction.

This disclosure provides systems, methods and apparatus for wireless power transfer. In one aspect the disclosure provides an apparatus for wirelessly communicating power. The apparatus includes a first conductive structure, with a length greater than a width, configured to wirelessly receive power via a magnetic field. The first conductive structure includes two substantially co-planar loops. The first conductive structure has a first edge and a second edge each intersecting a geometric line along the length of the first conductive structure. The apparatus further includes a second conductive structure, with a length greater than width, positioned between the first conductive structure and a magnetic material and configured to wirelessly receive power via the magnetic field. The length of the second conductive structure is substantially equal to at least a distance along the geometric line between the first edge and the second edge of the first conductive structure.

There is provided a secondary coil module receiving supply of electric power via a primary coil by contactless power transfer technique. The secondary coil module includes a core formed of magnetic material, the core having a tubular portion in the form of a tube and a bottom portion formed integral with the tubular portion in such a manner as to close an opening of the tubular portion formed at one axial end portion thereof, a storage battery accommodated within an accommodation space provided inside the tubular portion and configured to be charged by the power via the primary coil and a coil winding disposed outside the core and on the side of the bottom portion of the core.