Embodiments describe a wireless charging device that includes: a housing having an outer perimeter and one or more walls defining an interior cavity; a charging surface within the outer perimeter of the housing; a transmitter coil arrangement disposed within the interior cavity below the planar charging surface, the transmitter coil arrangement comprising a plurality of transmitter coils arranged in different layers, each transmitter coil having a pair of termination ends; wherein the plurality of transmitter coils comprises a plurality of inner transmitter coils and a plurality of outer transmitter coils positioned around the inner transmitter coils; and wherein the pair of termination ends of the plurality of outer transmitter coils are arranged differently than the pair of termination ends of the plurality of inner transmitter coils.

Embodiments describe a wireless charging transmitter coil includes: a support structure having an outer perimeter surrounding a contact housing and having first and second channels extending from the outer perimeter to the contact housing; first and second contacts positioned within the contact housing; and a wire wound around the outer perimeter of the support structure, the wire having a first end that extends through the first channel and a second end that extends through the second channel.

Embodiments describe apparatuses for wireless charging. An interconnection structure for a wireless charging device includes: a first contact configured for coupling with a first component of the wireless charging device; a second contact disposed below the first contact and configured for coupling with a second component of the wireless charging device; and a connector coupling the first contact with the second contact, wherein the first contact, second contact, and the connector form a monolithic structure.

Embodiments describe apparatuses for wireless charging. A wireless charging device for wirelessly charging a plurality of different electronic devices having different wireless power receiving characteristics includes: a housing having a charging surface and one or more walls defining an interior cavity; a first transmitter coil arrangement disposed within the interior cavity and comprising a first plurality of transmitter coils configured to wirelessly charge a first electronic device positioned on the charging surface; and a second transmitter coil arrangement disposed within the interior cavity below the first transmitter coil arrangement, the second transmitter coil arrangement comprising a second plurality of transmitter coils configured to wirelessly charge a second electronic device positioned on the charging surface; where the first transmitter coil arrangement operates at a first frequency, and the second transmitter coil arrangement operates at a second frequency different from the first frequency.

Embodiments describe a transmitter coil arrangement for a wireless charging device including: a first layer of transmitter coils, each transmitter coil in the first layer of transmitter coils is arranged in a first radial direction; a second layer of transmitter coils, each transmitter coil in the second layer of transmitter coils is arranged in a second radial direction that is offset from the first radial direction by an angular offset; and a third layer of transmitter coils, each transmitter coil in the top layer of transmitter coils is arranged in a third rotational direction that is offset from both the first and second radial directions by the angular offset, where the second layer of transmitter coils is disposed between the first and third layers of transmitter coils

Provided is an electronic device system. The electronic device system includes an electronic device having an open loop shape and a coil within the electronic device. The coil includes a first coil part through which current flows in a first direction, a second coil part through which current flows in a second direction opposite to the first direction, and a shield unit provided to at least one of the first coil part or the second coil part.

An induction charging device, in particular, a hand-held power tool induction charging device, including a coil unit and at least one shielding unit, which is for at least partially shielding the coil unit. It is provided that the induction charging device includes at least one adjustment unit, with the aid of which at least one shielding parameter of the at least one shielding unit is changeable.

A transformer includes: a core having a central arm and first and second outer arms on opposite sides of the of the central arm; a primary winding surrounding the central arm; a secondary winding surrounding the central arm; a primary winding shield surrounding the primary winding including a center tap connection connected to an output power connection; and a secondary winding shield surrounding the secondary winding including a center tap connection connected to an output power connection is disclosed. The transformer also includes a DC-to-AC converter connected to the primary winding that includes a primary bias power supply, a primary conversion element and a primary controller, an AC-to-DC converter connected to the secondary winding, a sensor connected to an output of the AC-to-DC converter and a secondary bias power supply that receives power from the secondary winding shield.

A common mode filter is manufactured to include a coil part including an insulation layer and a conductor pattern formed in the insulation layer; and a magnetic substrate coupled to one surface or both surfaces of the coil part. The magnetic substrate includes: an electrostatic absorbing layer made of an electrostatic absorbing material; a magnetic layer provided on one surface or both surfaces of the electrostatic absorbing layer and made of a magnetic material; and an electrode provided between the magnetic layer and the electrostatic absorbing layer and made of a conductive material. Therefore, common mode filter may maintain high efficiency characteristics while preventing an electrostatic discharge phenomenon.

A circuit includes a coupling structure and a first inductive device. The coupling structure includes two or more conductive loops and a set of conductive paths electrically connecting the two or more conductive loops. The first inductive device is magnetically coupled with a first conductive loop of the two or more conductive loops.