A system for reducing common-mode noise includes a switch mode power supply having primary and secondary sides, primary and secondary side grounds, an input voltage source, a primary switch, a transformer, a core, and a power output. The primary and secondary sides each have a quiet termination. The transformer includes a primary winding, a secondary winding, and an active shield winding between the primary and secondary windings. The active shield winding has two terminations, is wound in a same direction as the secondary winding, and occupies a same axial position on the core as the secondary winding. One of the terminations of the active shield winding is connected to the quiet termination of the primary side, so that the terminations of the secondary winding and the active shield winding that are adjacent each other carry alternating voltages of a same polarity and a same amplitude.

A coil component includes a body and a coil portion disposed in the body and including first and second lead-out portions. Recesses are disposed along edges of one surface of the body, and expose the first and second lead-out portions to internal walls and lower surfaces of the recesses. First and second external electrodes are disposed in the recesses, and are connected to the first and second lead-out portions. A third external electrode is disposed in the recesses, and is connected to a connection electrode disposed on side surfaces of the body and on another surface of the body opposite to the one surface. An external insulating layer covers the connection electrode, and has an opening exposing at least a portion of the connection electrode. A shielding layers is disposed on the external insulating layer and in the opening and connects to the connection electrode.

A wireless power transmission apparatus having a first coil configured to wirelessly charge a battery of a first electronic device; a second coil formed to have a size relatively greater than that of the first coil and configured to wirelessly charge a battery of a second electronic device; a shielding member configured to shield a magnetic field generated from the first coil and the second coil; and a case configured to accommodate the first coil, the second coil, and the shielding member, wherein the first coil is disposed so that a portion corresponding to a first width of a coil body overlaps a coil body of the second coil, and a portion corresponding to a remaining second width excluding the portion corresponding to the first width is located in a hollow part formed in the coil body of the second coil.

An electronic component includes an insulating layer that has a principal surface, a passive device that includes a low voltage pattern that is formed in the insulating layer and a high voltage pattern that is formed in the insulating layer such as to oppose the low voltage pattern in a normal direction to the principal surface and to which a voltage exceeding a voltage to be applied to the low voltage pattern is to be applied, and a shield conductor layer that is formed in the insulating layer such as to be positioned in a periphery of the high voltage pattern in plan view, shields an electric field formed between the low voltage pattern and the high voltage pattern, and suppresses electric field concentration with respect to the high voltage pattern.

A method of manufacturing a wireless power reception apparatus includes: forming a lower tray that includes a thermally conductive material and accommodates and fix a coil winding; arranging a coil winding on the lower tray; forming a magnetic field shielding plate so as to accommodate and fix a plurality of magnetic tiles at predetermined intervals; forming a coupled member of a magnetic tiles-magnetic field shielding plate by arranging the plurality of magnetic tiles at the predetermined intervals on the magnetic field shielding plate; forming a thermally conductive polymer molding layer by applying a thermally conductive polymer molding solution to fill spaces between the coil winding and the coupled member of a magnetic tiles-magnetic field shielding plate and bonding the plurality of magnetic tiles and the coil winding such that the plurality of magnetic tiles are positioned over the coil winding; and curing the thermally conductive polymer molding layer.

A shielding layer that is made of conductive and magnetic material is used to encapsulate the bare metal wire of a coil of an inductor to shield the coil from the external magnetic field and make the resistance and the power loss of the inductor lower.

In an embodiment, a circuit includes: a transformer defining an inductive footprint within a first layer; a grounded shield bounded by the inductive footprint within a second layer separate from the first layer; and a circuit component bounded by the inductive footprint within a third layer separate from the second layer, wherein: the circuit component is coupled with the transformer through the second layer, and the third layer is separated from the first layer by the second layer.

Heat is less likely to transfer from a terminal electrode to a wire. A coil component includes a core, a first terminal electrode provided on a first flange of the core, a winding portion wound around a winding core of the core, and a first wire having a first end. The first end of the first wire is electrically connected to the first terminal electrode. A part of the first end is spaced apart from the first terminal electrode.

Micro-scale devices, such as transformers and capacitors, having a floating conductive layer are disclosed. A floating conductive layer may be disposed in an insulator layer and can reduce a maximum electric field between a first planar conductor and a second planar conductor of a micro-scale passive device. Reduction of a maximum electric field between a first planar conductor and a second planar conductor can reduce undesirable effects on electrical components.

A method of manufacturing a wireless power reception apparatus includes: forming a lower tray that includes a thermally conductive material and accommodates and fix a coil winding; arranging a coil winding on the lower tray; forming a magnetic field shielding plate so as to accommodate and fix a plurality of magnetic tiles at predetermined intervals; forming a coupled member of a magnetic tiles-magnetic field shielding plate by arranging the plurality of magnetic tiles at the predetermined intervals on the magnetic field shielding plate; forming a thermally conductive polymer molding layer by applying a thermally conductive polymer molding solution to fill spaces between the coil winding and the coupled member of a magnetic tiles-magnetic field shielding plate and bonding the plurality of magnetic tiles and the coil winding such that the plurality of magnetic tiles are positioned over the coil winding; and curing the thermally conductive polymer molding layer.