Inductive power transfer flux coupling apparatus includes a first coil arranged in a first layer and configured to generate or receive a magnetic coupling flux in a flux coupling region, and a second coil. At least part of the second coil being arranged in a second layer and is configured to generate a magnetic flux that reflects flux from the first coil.

A transformer includes an isolation core casing of a power converter. The transformer includes a primary winding, a secondary winding, a magnetic core, a cover, and a cup. The cover and cup are joined and sealed together to form the core casing. The primary winding is wound directly on the magnetic core, and the magnetic core is sealed within the core casing. The secondary winding is wound around the core casing such that the primary and secondary windings are electrically isolated from each other by a solid insulation barrier provided by the core casing, resulting in no increase in the creepage or the clearance path between the primary and the secondary windings, which allows the transformer to be miniaturized without negatively affecting safety and converter performance due to leakage inductance.

A reactor including a coil having a wound portion that is formed by winding a wire, a magnetic core having an inner core portion disposed inside the wound portion and an outer core portion disposed outside the wound portion, the inner and outer core portions forming a closed magnetic circuit, and an inner resin portion that joins an inner peripheral surface of the wound portion and an outer peripheral surface of the inner core portion to each other. The inner core portion includes a plurality of core pieces and gap portions that are constituted by a portion of the inner resin portion, the core pieces each including a gap-facing surface that faces a corresponding gap portion, a coil-facing surface that faces the inner peripheral surface of the wound portion, and a notch-shaped resin flow portion at a corner portion between the gap-facing surface and the coil-facing surface.

A reactor includes a coil having a winding portion, a magnetic core, and a holding member holding an end surface of the winding portion and the outer core portion of the magnetic core, the holding member having a through hole into which an end portion of the inner core portion of the magnetic core is inserted. One of the inner core portion and the outer core portion is a hybrid core composed of a powder compact and a resin core molded on an outer periphery of the powder compact, and the other of the inner core portion and the outer core portion is a hybrid core or a resin core. The resin core of the inner core portion and the resin core of the outer core portion are continuous with each other via the through hole of the holding member so as to form a seamless single body.

Provided is a transformer (1), which includes: a core (10) which forms a magnetic circuit and has a middle leg (10a) and a plurality of side legs (10b, 10c) branched from the middle leg (10a); primary windings (11) respectively wound around a first winding leg (10a) and a second winding leg (10b), which are selected from the middle leg (10a) and the side legs (10b, 10c); and a secondary winding (12) wound around either of the first winding leg (10a) or the second winding leg (10b), wherein a first magnetic flux generated by the primary windings (11) from the first winding leg (10a) and a second magnetic flux generated by the primary windings (11) from the second winding leg (10b) differ from each other by a predetermined value or more at a position at which the fluxes do not intersect with the secondary winding (12).

A planar array coil includes a multilayer substrate at which a plurality of coils are formed and arranged on a plane of the multilayer substrate. First ends of the plurality of coils are connected to switching circuit units of a power conversion circuit, and second ends of the plurality of coils are connected to a common output part. The coils include two coil parts in which currents flow in opposite rotation directions, and one coil part of one coil is adjacent to one coil part of another coil. The plurality of coils are connected such that operation of switching circuits causes currents in regions of adjacent coil parts that extend in parallel to each other to flow in the same direction. Accordingly, adverse effects by unwanted coupling between adjacent coils are reduced and a switching power supply device that includes the planar array coil performs stable power conversion operations.

A transformer includes a core with a surface, a primary winding with two or more primary winding turns wrapped about the core, and a secondary winding with one and only one secondary winding turn extending about the core. The one and only one secondary winding turn is interleaved among the two or more primary winding turns on the surface of the core to limit magnetic flux leakage along the primary winding and the secondary winding. Power converters and power conversion methods are also described.

A magnetizing device includes: an inner magnetic portion having a first magnet assembly, a second magnet assembly, a third magnet assembly, and a fourth magnet assembly which are combined to form a hollow region. The first magnet assembly and the second magnet assembly each include: two first-direction magnets, a magnetic direction of each of the first-direction magnets is away from the hollow region, the third magnet assembly and the fourth magnet assembly each include two second-direction magnets, and a magnetic direction of each of the second-direction magnets faces the hollow region. A magnetic barrier portion surrounds the inner magnetic portion and includes a plurality of third-direction magnets, each two of the third-direction magnets has a joint surface therebetween, a magnetic direction of each third-direction magnet faces the joint surface, and magnetic poles of each of the third-direction magnets are opposite to magnetic poles of an adjacent third-direction magnet.

An electromagnetic induction device comprises comprising a magnetic core having a limb and at least one winding wound around the limb is presented. The winding comprises: an electrical conductor forming a plurality of radially overlapping layers around an axis; an electrically insulating material positioned between the radially overlapping layers of the electrical conductor; at least one magnetic material end-fill positioned at at least one axial end of the winding in electrical in contact with the layers of the electrical conductor so to be at the same electrical potential with the latter.

A single-ended inductor comprises a first partial coil wound in a first direction; and a second partial coil wound in a second direction and adjoined the first partial coil; wherein, the second direction is opposite to the first direction to reduce the coupling of single-ended inductors and peripheral lines and reduce signal interference.