A device includes a first inductor and a second inductor reversely coupled with the first inductor, wherein the first and second inductors have overlapping windings. The device also includes a housing for the first and second inductor, wherein the housing is filled with a magnetic molding compound.

A coil component includes a coil conductor; a magnetic base body part in which the coil conductor is provided; a conductive resin part provided on the surface of the magnetic base body part and containing multiple magnetic grains and a resin; first external electrodes electrically connected to the coil conductor; and a second external electrode electrically connected to the conductive resin part. The coil component can maintain the Q-characteristics while keeping electric field leakage low.

A molded-forming power inductor comprises a conductor, a magnetic core and a magnetic molding package layer, wherein the conductor comprises an integrally formed insulation-processed base part, an insulation-processed side enclosing part and an electrode part, the base part and the side enclosing part are assembled with the magnetic core in a gapless fit mode, and the magnetic molding package layer is gaplessly wrapped outside the conductor and the magnetic core. A method is provided for manufacturing the molded-forming power inductor. The molding package layer completely covers the prefabricated magnetic core and a part of the conductor except the electrode, the structure is integrally formed, and the leakage magnetic flux is less; when the equivalent magnetic permeability is 60 or more, the equivalent saturation magnetic flux density can be 0.55T or higher; and the space utilization rate is high to facilitate miniaturization of an inductor design.

A multi-leg transformer includes a core having a plurality of center posts, a primary coil wound around at least one of the center posts, a secondary coil wound around at least one of the center posts and spaced apart from the primary coil, and at least one magnetic shunt material disposed in one or more selected areas between the primary coil and the secondary coil.

A zero-sequence blocking transformer includes a first core part around which is wound a first winding and a second core part around which is wound a second winding, and a third core part to create an additional leakage flux path. The concept of this disclosure can be applied to any known core structure by adding an additional leakage flux component part. In the case of a known toroidal core, the additional component part may be a rod of magnetic material fitted into the gap between the two windings to intentionally create an additional leakage flux path. Alternatively, an EE core geometry can be used and the additional leakage flux path is created by forming an air gap or adding a magnetic material insert in the leg which does not carry a winding.

In the reactor in which the wiring board with the main winding formed thereon and the wiring board with the control winding formed thereon are incorporated in layers into the planer core, the magnetic flux generated by the main winding and the magnetic flux generated by the control winding are brought into the following states in order to equalize the density of the magnetic flux generated by the control current. A main winding current of high-frequency current flowing through the main winding generates an AC magnetic fluxes, each of the fluxes having a magnetic field in a direction opposite to each other so as to cancel each other out, and a control current of direct current flowing through the control winding generates a DC magnetic flux with a uniform magnetic flux density around the pair of the inner legs of which AC magnetic fluxes are cancelled out each other.

An inductor arrangement, comprising: a first pair of driven inductors configured to be driven to generate magnetic fields which are substantially in antiphase, and arranged relative to one another so that their magnetic fields substantially cancel one another at a first null line between those inductors; and a second pair of driven inductors configured to produce magnetic fields which are substantially in antiphase, and arranged relative to one another so that their magnetic fields substantially cancel one another at a second null line between those inductors, wherein the pairs of driven inductors are arranged relative to one another so that the first and second null lines intersect one another, with the first pair of driven inductors located substantially on the second null line and the second pair of inductors located substantially on the first null line.

An isolated switch-mode power supply includes at least one input, at least one output, and a power circuit coupled between the at least one input and the at least one output for converting an input voltage or current to an output voltage or current. The power circuit includes a transformer having one or more primary windings, one or more secondary windings, an electrical insulator, and a core magnetically coupling the one or more primary windings and the one or more secondary windings. Upper portions of the primary and secondary windings are covered with the electrical insulator. Other example switchmode power supplies, transformers, magnetic chokes and methods are also disclosed.

A coil component includes a body having a first surface and a second surface opposing each other in a thickness direction of the body and including a core formed in the thickness direction; a coil part embedded in the body and including at least one turn around the core; an insulating layer disposed on the first surface of the body; a bonded conductive layer disposed on the insulating layer and having a surface roughness of the first surface which is in contact with the insulating layer greater than a surface roughness of the second surface opposing the first surface of the bonded conductive layer; and external electrodes connected to the coil part and covering the bonded conductive layer.

The present disclosure provides a coupled inductor and a power module. The coupled inductor includes a magnetic core, a first winding, a second winding, and an adjustment structure located in the magnetic core. At least part of the first winding and at least part of the second winding are in the magnetic core, a stacked portion of the first winding and a stacked portion of the second winding are stacked in a height direction, a non-stacked portion of the first winding and the second winding are not stacked in the height direction, and a non-stacked portion of the second winding and the first winding are not stacked in the height direction. The adjustment structure which is adjoining the non-stacked portion of the first winding and the non-stacked portion of the second winding and has a lower magnetic permeability than that of the magnetic core may adjusts leakage inductance.