A transformer includes two first cores, a primary winding and a secondary winding. The secondary winding has a first section and a second section. The first section has a first outlet end, a second outlet end, and a first connection end, wherein the first outlet end and the second outlet end are located at a side of the first section, the first connection end is located at an opposite side of the first section. The second section has a third outlet end, a fourth outlet end, and a second connection end. The third outlet end and the fourth outlet end are located at a side of the second section, and the second connection end is located at an opposite side of the second section. A portion of the primary winding is located between the first section and the second section of the secondary winding.

An electromagnetic device for converting energy comprises: a ferromagnetic core of essentially planar shape and delimited by a peripheral contour; a primary winding and a secondary winding formed by primary turns and secondary turns, respectively. The device includes, arranged against the peripheral contour, a first block and a second block and a ferromagnetic material, and has a magnetic permeability lower than that of the ferromagnetic core. At least one primary turn and/or at least one secondary turn is formed around or passing through the first block and/or the second block to form, respectively, a first leakage inductance and/or a second leakage inductance.

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 passive cooling topology and a manufacturing method are described for a transformer to achieve improved power density at a light weight. No fans or cooling liquids are required. Vertical planar faces are used for the central core element, the primary and secondary windings, the outer core element, and a finned heat sink. The primary flow for thermal cooling is radial, through the vertical planar faces. The transformer may be configured to float at the potential of a high voltage transmission line, leading to improved thermal characteristics. Eddy currents are reduced using repeating air gaps in the central core, and a continuously transposed cable comprising multiple strands per turn in the secondary winding. Air pockets in the windings are eliminated using a potting resin and vacuum pressure impregnation (VPI).

A reactor that includes a coil having a wound portion; a magnetic core; a holding member provided at both ends of the wound portion; a mold resin by which the coil and the holding member are integrated into one piece; a casing that houses an assembly that includes the coil, the magnetic core, and the holding member; and a potting resin that fills up the casing to seal at least a part of the assembly.

An electrical isolation device including a support with thickness E including two faces facing one another, referred to, respectively, as the two faces having a length L, a width l; on each face of the support, a plurality of voltage dividers is positioned extending over the length, each voltage divider including electrical components that are connected in series and arranged according to a first and a second stage, each first stage including a row of even components and a row of odd components, the rows being parallel, and adjacent, and the second stage corresponding to a linear arrangement of components.

According to one embodiment, an inductor includes a magnetic substance core, a coil, a cast case and a cast resin. The coil is wound around the magnetic substance core. The cast case has a body at least partially formed from conductive substance, stores the magnetic substance core and the coil. The cast resin that is formed from a first resin which is an insulator, is located within the cast case, covering the magnetic substance core and the coil.

A resin produced by a conventional technique has a weak nature in terms of hydrolysis resistance. For example, in a case where the resin produced by a conventional technique is used in an area with a highly humid climate such as Japan for a long period of time, deterioration of the resin due to hydrolysis becomes a concern. A resin composition is described that is optimized in the molecular structure design of the resin and in the catalyst in order to improve the hydrolysis resistance. Specifically, the resin composition contains (1) a copolymer of a vinyl compound having two or more epoxy groups, a carboxylic acid anhydride, and a transesterification reaction catalyst, or (2) a copolymer of a vinyl compound having two or more carboxylic acid anhydride groups, an epoxy, and a transesterification reaction catalyst.

A method for producing an inductive charging device may include inserting a ferrite and a coil, wound from a braid, into a mould; and encasing the ferrite and the braid at least partially with a plastic in a low pressure casting method, a pressing transfer moulding method, or an injection moulding method.

In a coil component, fixing strength of an external terminal is improved. In the coil component, on the end face of the element body, the center position of the external terminal electrode in the first direction is biased toward the center position of the end face with respect to the center position of the outer end portion. Therefore, the fixing area between the external terminal electrode and the element body is increased on the center position side of the end face, and thus fixing strength between the external terminal electrode and the element body is improved.