A surge blocking inductor. In one embodiment, the surge blocking inductor includes a core; a first winding wound about the core in a first direction; and a second winding wound about the core in a second direction, wherein the first winding and the second winding are magnetically independent when the core is in a non-saturated state, and wherein the first winding and the second winding are coupled magnetically when the core is in a saturated state.

A wireless power charging device includes a coil configured to transmit or receive a wireless power signal; an electromagnetic wave shielding sheet disposed proximate the coil; and, a heat radiation layer disposed on the electromagnetic wave shielding sheet.

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.

A metamaterial electromagnetic absorber includes a substrate having a first surface on which electromagnetic waves are incident and a second surface opposite the first surface. The substrate is made of a metamaterial. The metamaterial electromagnetic absorber also includes a first inductive conduction pattern and a second inductive conduction pattern formed on the first surface and the second surface, respectively.

Provided are a wireless charging board and a wireless charging device. The wireless charging board includes: a shielding layer; a coil pattern disposed on one surface of the shielding layer; and a magnetic pattern disposed in a space of a central part of the coil pattern.

Methods of and systems for directing flux from a transmit coil to a receive coil within an inductive power transfer system are disclosed. For example, a transmit coil may be shielded with a contoured shield made from a ferromagnetic material. The contoured shield may contour to several surfaces of the transmit coil so as to define a single plane through which flux may be directed to a receive coil.

The present invention discloses structures of a planar transformer and a balanced-to-unbalanced transformer. The structure of the planar transformer includes a first planar coil, a second planar coil and a third planar coil. The first planar coil has a first ring structure, a second ring structure, and a connecting section. The first ring structure and the second ring structure are connected by the connecting section. A range of the second planar coil and a range of the first ring structure at least partially overlap. A range of the third planar coil and a range of the second ring structure at least partially overlap. A transformer is constituted by the first planar coil and the second planar coil or by the first planar coil and the third planar coil.

An inductor is disclosed, including a first wire, a non-conductive material, and a shell. The non-conductive material may cover the first wire, with a portion of each end of the first wire uncovered. The shell may include a top portion and a bottom portion and include at least one magnetized layer and at least one gap between the first portion and the second portion. The shell may also surround a portion of the non-conductive material.

The present invention relates to a WPT coil and an apparatus having same, and more particularly, to a WPT coil configured to have a three-dimensional shape by using a flexible substrate or the like, and an apparatus having same. A WPT coil is provided in a WPT device to transmit or receive wireless power, according to the present invention, the WPT coil comprising: a flexible substrate; and a coil structure provided on the flexible substrate, wherein the WPT coil forms a three-dimensional shape rather than a flat plate shape.

A power reception device includes: a housing including a first surface facing in a first direction, a second surface facing in a second direction opposite to the first direction, and a side surface surrounding a space between the first surface and the second surface; a coil antenna wound in a circle; a shielding sheet disposed over the coil antenna; and a first magnet and a second magnet adjacent to an outermost coil of the coil antenna and disposed to be spaced apart from the outermost coil. The first magnet is disposed so that a portion of magnetism induced by the first magnet is formed in the first direction. The second magnet is disposed so that a portion of the magnetism induced by the second magnet is formed in a third direction that is an outside direction from a center of the coil antenna.