An inductor includes a core including a multilayer part in which magnetic layers and insulating layers are alternately stacked; a coil including a wound part having a winding axis substantially perpendicular to a stacking direction of the multilayer part; and an element body. The multilayer part includes a first multilayer part in which first magnetic layers and insulating layers are alternately stacked and second and third multilayer parts in which second magnetic layers and insulating layers are alternately stacked, the electrical resistivity and/or relative magnetic permeability of the second magnetic layers being larger than those of the first magnetic layers. The first multilayer part has first and second surfaces that are perpendicular to the stacking direction and face each other and third and fourth surfaces that are parallel to the stacking and winding axis directions. The second and third multilayer parts are arranged on the first and second surfaces.

A conductive structure for an electromagnetic device includes a conductive sheet and a plurality of protrusions. The conductive sheet includes two electrical connection terminals. The protrusions are arranged between the electrical connection terminals. The protrusions include a support. The support is connected to the conductive sheet. Adjacent two of the protrusions define a first heat dissipation passage.

An object of the present invention is to provide a small-sized and highly heat-dissipative reactor and a DC-DC converter using the reactor. A reactor according to the present invention includes a plate bus bar, a core, and a heat sink. The core includes a middle leg portion. The heat sink cools the plate bus bar. The plate bus bar is formed such that a winding axis of a winding including the plate bus bar passes through the middle leg portion. A main surface of the plate bus bar is disposed in parallel with a direction of the winding axis and thermally connected to the heat sink via an insulating layer.

In the multi-layer inductor, the internal electrode includes the auxiliary conductor, and the auxiliary conductor is jointed to the external electrode at the end face. Therefore, when a defect occurs in a part of the through conductors, a current flows through the remaining through conductor(s) and a current also flows through the auxiliary conductor. Therefore, overheating at the joint surface between the remaining through conductor(s) and the external electrode can be prevented, and cutting and/or fusion starting from the joint surface can be prevented.

An inductor including a conductor having a plate thickness is embedded in a core containing magnetic powder. The core includes a mounting surface facing a mounting substrate side at the time of mounting, an upper surface facing the mounting surface, and a pair of end surfaces orthogonal to the mounting surface. The conductor includes a conductive wire extending inside the core over the pair of end surfaces, and a pair of electrode terminals. Each electrode terminal includes an electrode portion at respective end portions of the conductive wire and exposed to the mounting surface, and first and second bent portions having a first bend and second bend, respectively, which are each 2.0 times to 3.0 times the plate thickness. When one of the first and second bends is 2.0 times or more the plate thickness, the other is less than 3.0 times the plate thickness.

A method for manufacturing a wireless charging device is disclosed. The method includes: providing a substrate, a first metal plate, and a second metal plate; forming a plurality of circles of slots, each of the circles of slots including at least one first slot and at least one second slot, the at least one first slot having a first depth, and the at least one second slot having a second depth; forming a first coil and a second coil by performing a metal forming process on the first metal plate and the second metal plate; and placing the first coil in the at least one first slot, and placing the second coil in the at least one second slot. In the method, the first coil and the second coil have good fixity and are easily to be assembled.

The invention relates to a transformer construction comprising a plurality of transformer cores configured to share magnetic flux paths and, as a result, at least one of the cores comprises a post and an associated sidewall having an effective cross-sectional area which is less than that of the post. Such a construction may be employed in a power conditioning unit, for example, for a photovoltaic module, which is configured to operate the cores out of phase from each other. Also described is a transformer winding comprising a longitudinal spine having a first turn emanating from a first portion of the spine in a first transverse direction and a second turn emanating from a second portion of the spine in a second transverse direction, wherein the second transverse direction is opposite to the first transverse direction.

An inductor capable of suppressing deformation of a conductive wire portion in a core. The inductor includes a conductor is embedded in a core containing magnetic powder. The core includes a mounting surface facing a mounting substrate side at the time of mounting, and a pair of end surfaces orthogonal to the mounting surface. The inductor includes a conductive wire portion extending inside the core over the pair of end surfaces and an electrode portion led out from each of the pair of end surfaces and extending along the end surface and the mounting surface. The conductive wire portion includes a reinforcing portion.

An inductor includes a core containing magnetic powder and a conductor embedded in the core. The core includes a mounting surface facing a mounting substrate side at the time of mounting, a pair of end surfaces orthogonal to the mounting surface, a pair of side surfaces orthogonal to the mounting surface and the pair of end surfaces. The conductor has a plate shape and includes a conductive wire portion extending inside the core over the end surfaces and a pair of electrode portions provided at both end portions of the conductive wire portion and extending from the end surface of the core to the mounting surface. The conductive wire portion includes a belt-shaped flat plate portion. One surface of the electrode portion facing the core is embedded in the core, and the other surface of the electrode portion facing the one surface is exposed from the core.

A transformer with a bobbin for preventing a crack may include a lower core configured to be provided with a lower assembling jaw, a bobbin for preventing a crack configured to have a center rib which is provided with a lower core crack preventing part inserted into the lower assembling jaw and an upper core crack preventing part formed at an opposite side to the lower core crack preventing part, having a predetermined thickness, a bus bar configured to penetrate through the center rib, an insulating plate configured to be stacked on an upper end surface of the bus bar, and an upper core inserted into the insulating plate and the bus bar and inserted into the upper core crack preventing part.