A method for producing a coil for a transformer, in particular for a medium frequency transformer for a resonant DC/DC converter or a dual active bridge DC/DC converter, is disclosed which: providing a plurality of M>1 conductive foil strips, each having a first ending and a second ending; stacking the plurality of conductive foil strips to obtain a foil strip stack having a first ending and a second ending, wherein an electrically insulating layer is provided between any two adjacent foil strips; electrically interconnecting the first endings of all conductive foil strips to a first terminal; for each of the conductive foil strips providing a connector at the second ending of the foil strip; and coiling up the foil strip stack from the first end.

To improve magnetic characteristics of a coil component having a structure in which an interlayer insulating film is provided between a spiral coil pattern and a magnetic element body. A coil component 1 includes: an interlayer insulating film 41 covering coil patterns CP1 to CP3 from one side in the axial direction of the coil patterns; a magnetic element body M1 filled in the inner diameter areas of the coil patterns CP1 to CP3; and a magnetic element body M2 covering the coil patterns CP1 to CP3 from the one side in the axial direction through the interlayer insulating film 41. The interlayer insulating film 41 has a protruding part 41A radially protruding to the inner diameter area, and the protruding part 41A is curved to the other side in the axial direction. Since the protruding part 41A is curved in the axial direction, the entrance of a magnetic path passing through the inner diameter area is made wider than when the protruding part 41A linearly protrudes to the inner diameter area. This suppresses deterioration in magnetic characteristics due to the presence of the protruding part 41A.

A magnetic element. In some embodiments, the magnetic element includes a first electrically conductive coil, having a first annular surface and a second annular surface; a second electrically conductive coil, having a first annular surface and a second annular surface; and a spacer between the first electrically conductive coil and the second electrically conductive coil; a fluid inlet; and a fluid outlet. The spacer may have a first face, the first face being separated from the first annular surface of the first electrically conductive coil by a first gap; and a fluid path may extend from the fluid inlet to the fluid outlet through the first gap.

A coil component may include a body having one surface and the other surface facing each other, and including a molded portion having a core and a cover portion disposed on the molded portion; a wound coil disposed between the molded portion and the cover portion and wound around the core; and a first accommodation groove and a second accommodation groove disposed on the one surface of the body to be spaced apart from each other, and respectively disposed outside of a region of the body corresponding to the core, wherein both end portions of the wound coil are respectively disposed in the first and second accommodation grooves, and a minimum value of a distance between the first and second accommodation grooves is greater than a diameter of the core.

The invention comprises an apparatus, comprising: an inductor, the inductor comprising: an electrical turn about an inductor core, the inductor core comprising a ring shape; the electrical turn comprising a first width at a first radial distance from a center of the inductor core and a second width at a second radial distance from the center, the second width at least ten percent larger than the first width. Optionally and preferably, the electrical turn comprises: a first cast element and a second cast element and a mechanical connection connecting the first cast element to the second cast element, such as an aluminum weld.

An inductor component includes a main body formed in a flat-plate shape and including a magnetic layer; an inductor wiring line disposed on a plane inside the main body; a first vertical wiring line that extends, from a pad portion which is an end portion of the inductor wiring line, in a first direction to pass through the inside of the main body, and is exposed on a first principal surface side of the main body; a second vertical wiring line that extends, from the pad portion of the inductor wiring line, in a second direction to pass through the inside of the main body, and is exposed on a second principal surface side of the main body; and an insulation layer of a non-magnetic body. The first vertical wiring line includes a via conductor and a columnar wiring line. The second vertical wiring line includes a columnar wiring line.

This disclosure provides an integrated transformer and a power converter, the integrated transformer includes: a magnetic core, including an upper cover, a lower cover, a first winding column and a second winding column; a printed wiring board, disposed between the upper cover and the lower cover, and including a first through hole corresponding to the first winding column and a second through hole corresponding to the second winding column; and a first winding, a second winding, a third winding and a fourth winding; the first winding and the third winding are wound on the first winding column and the second winding column respectively, the second winding and the fourth winding are provided at positions corresponding to the first through hole and the second through hole on the printed wiring board, and magnetic flux directions within the first winding column and the second winding column are opposite.

A reactor includes a coil, a magnetic core having an inner core portion inside a winding portion, and an inner interposed member insulating the winding portion from the inner core portion. The inner interposed member includes a thin portion with a small thickness formed by a recess, and a thick portion with a thickness larger than that of the thin portion. The inner core portion includes a core-side projecting portion with a shape conforming to a shape of the inner peripheral face of the thin portion. The thickness of the thin portion is 0.2 mm or more and 1.0 mm or less, and the thickness of the thick portion is 1.1 mm or more and 2.5 mm or less. Clearances are in part of a portion between the inner core portion and the inner interposed member and of a portion between the inner interposed member and the winding portion.

A reactor includes a coil, a magnetic core having an inner core portion arranged inside a winding portion, and an inner interposed member insulating the winding portion from the inner core portion. The inner interposed member includes a thin portion with a small thickness, and a thick portion with a thickness larger than that of the thin portion. The inner core portion includes, on an outer peripheral face facing the inner interposed member, a core-side projecting portion with a shape conforming to a shape of the inner peripheral face of the thin portion. The thickness of the thin portion is 0.2 mm or more and 1.0 mm or less, and the thickness of the thick portion is 1.1 mm or more and 2.5 mm or less. There is a clearance in at least part of a portion between the inner interposed member and the winding portion.

The invention comprises a method for manufacturing an inductor, comprising the steps of: casting a cast winding comprising an inner cavity; inserting a first inductor core subsection into the inner cavity; inserting a second inductor core subsection into the inner cavity; and mechanically coupling the first inductor core subsection to the second inductor core subsection to form an inductor core wound by the cast windings. The method of manufacturing optionally includes the steps of: forming at least a portion of the cast winding into an arced helical shape; forming the first inductor core subsection and the second inductor core subsection into elements of a torpid shaped inductor core; deforming the cast winding to physically allow the step of inserting the first inductor core subsection into the inner cavity; and/or deforming at least a portion of the cast winding into an arced helical coil shape after the step of inserting.