A coil device with a cooling structure includes: a coil unit that has a core structure having one or more leg parts and one or more coils wound around the one or more leg parts; and a flow-rectifying member having a flat plate portion covering a face of the one or more coils and flow-rectifying ribs inwardly protruding from an inner surface of the flat plate portion, the flow-rectifying ribs extending in a direction parallel to center axes of the one or more coils and being positioned to face side boundaries of the face of the one or more coils. The flat plate portion and the flow-rectifying ribs form a first air cooling channel at a substantially uniform gap outside of the one or more coils along the direction parallel to the center axes thereof, the first air cooling channel passing cooling air to air-cool the one or more coils.

Systems and methods for transformer cooling by vertical airflow are described. One embodiment of an air transfer unit includes an assembly frame that includes an interior portion and defines a lateral side, an upper side, and a lower side, where the assembly frame includes a length that is substantially the same as a width of a plurality of cooling fins on a transformer. Some embodiments include a plurality of air directing apparatuses that are positioned in the interior portion and are aligned along the length of the assembly frame, where the plurality of air directing apparatuses receive airflow from the lateral side and direct the airflow vertically through the upper side to further cool the plurality of cooling fins. Similarly, some embodiments include an exhaust screen that is coupled to the upper side, wherein the exhaust screen further consolidates the airflow vertically toward the plurality of cooling fins.

In one aspect, a medium voltage power converter includes a plurality of slices each having: a transformer including a plurality of primary windings to couple to a utility source of input power and a plurality of secondary windings; and a plurality of power cubes coupled to the plurality of secondary windings, each of the plurality of power cubes comprising a low frequency front end stage, a DC link, and a high frequency silicon carbide (SiC) inverter stage to couple to a high frequency load or to a high speed machine.

A power reception device includes a first case having an accommodation portion formed therein, a core disposed in the first case, a second coil disposed in the first case and provided on the core, a first electrical device disposed in the first case and connected to the second coil, a first insulation member disposed between an inner surface of the first case and the second coil, and between the inner surface of the first case and the first electrical device, and a cooling device that causes a flow of a coolant to cool the second coil and the first electrical device, the second coil and the first electrical device being attached to the inner surface of the first case with the first insulation member interposed therebetween, the first electrical device being disposed upstream in a flow direction of the coolant from the second coil.

A power converter is provided that includes a reactor that is improved in effect of cooling a core and a winding. The power converter includes: a cooling member having a first cooling surface; and a reactor including a core portion and a winding portion. The core portion is a rectangular parallelepiped and disposed on the first cooling surface that is larger in area than the core portion in a plan view. The winding is wound around the core portion and the cooling member. The power converter further includes a power conversion module connected to one end of the winding portion.

In the multi-layer inductor, all of the plurality of through conductors are not aligned in a straight line, and the distance between the through conductors can be sufficiently kept in the element body having a predetermined dimensional standard. Therefore, the through conductor as a heat source is apart from each other, and the heat of the through conductor can be efficiently radiated to the outside of the element body.

A method and apparatus for providing welding type power supply includes a power circuit and a control circuit. The power circuit receives input power and provides welding type power to a welding output. The power circuit includes a transformer having a primary winding and a secondary winding. The secondary winding is in electrical communication with the welding output. The control circuit is connected to control the power circuit. The transformer includes a bobbin with the primary winding and the secondary winding wound thereon. The bobbin can includes vents to allow air flow into the bobbin. A winding separator can be disposed between the primary and secondary windings.

A wireless device charger configured to produce an alternating magnetic field, thereby inducing an alternating electrical current within a capture coil of a personal electronic device proximate to the wireless device charger, said wireless device charger includes a source coil having a ferrite element configured to generate the alternating magnetic field, a housing formed of a thermally conductive material in thermal communication with the ferrite element, and an air movement device configured to produce an air flow across a surface of the housing flowing from an air inlet to an air outlet, thereby reducing a housing temperature. The surface of the housing defines a plurality of fins extending along the housing in a direction of the air flow. At least one fin in the plurality of fins has a non-symmetric surface, thereby creating turbulence in the air flow.

Embodiments include a microelectronic device package structure having an inductor at least partially embedded within a substrate. At least one thermal solution structure may be on a surface of the inductor, and may be thermally coupled with the inductor. The one or more thermal solution structures provide a thermal pathway for cooling for the inductor, and extend a thermal time constant of the inductor.

An arrangement to cool a coil, comprising an enclosure, which at least partially incorporates or houses the coil, and a device to create an airflow to cool the coil, wherein the coil comprises at least one cooling channel to guide the airflow through the windings of the coil and an outer air duct lying radially in the outer circumference area of the coil or lying radially inside below an outer part of the coil, characterized in that an air guidance plate is placed at or near one longitudinal end of the outer air duct and/or of the coil to prevent bypasses of the airflow and/or to block at least partially the airflow through and/or along the outer air duct, achieves the object to cool a coil, especially a coil of a transformer, in an efficient manner using space-saving means.