The present disclosure discloses an inductive device having electromagnetic radiation shielding mechanism. The inductive device includes an inductive unit and a shielding structure. The shielding structure forms at least one closed shape that encloses the inductive unit. The shielding structure has a width thereof and a distance separated from the inductive unit such that a decreasing amount of a quality factor of the inductive unit is not larger than a first predetermined value and a shielded amount of electromagnetic radiation is not lower than a second predetermined value.

A Method of reducing leakage magnetic flux for a shell-type transformer or inductor is disclosed. The magnetic flux density is reduced between flux transitional areas and corner losses are reduced.

Advantageous, the method may also help to reduce the operational temperature of the transformer or inductor (of any size) during normal use. The centre of the ferromagnetic core is cooled. The effective outside area of the core is enlarged. The transformer core is organized to have any number of cooling holes (400.3.1), (400.3.2) without reducing the area for magnetic flux to circulate around the core. Several embodiments are disclosed. Various improvements may be made without departing from the methods and principals disclosed in this patent.

The present invention provides a magnetic core and transformer which are reduced in core loss.

The magnetic core according to the present invention comprises a core member which is formed by winding first electrical steel sheets, which is ring shaped seen from a side surface, and which has one or more bent parts seen from a side surface and one or more stacks of second electrical steel sheets stacked together, each the stack being arranged at least at one of the surfaces formed by side surfaces of the first electrical steel sheets at a bent part of the core member so that a surface formed by side surfaces of the second electrical steel sheets runs along it.

A circuit includes a bias-tee circuit including a signal line, a constant-voltage power supply, an inductor, and a capacitor. The signal line includes a first signal line and a second signal line. The inductor includes a first inductor and a second inductor. The first inductor is connected to the first signal line and the constant-voltage power supply. The second inductor is connected to the second signal line and the constant-voltage power supply. The shortest distance between the first inductor and the second inductor is not less than 0.05 mm and not more than 1 mm (i.e., from 0.05 mm to 1 mm). The direction of a coil axis of the first inductor and the direction of a coil axis of the second inductor are parallel with a mounting surface and form an angle of approximately 90 degrees.

A reactor includes a reactor main body that includes a core and a coil attached to the core, a casing that houses therein the reactor main body and has a portion where an opening is formed, a terminal stage that supports the portion of a conductor electrically connected to the coil, and a shielding member that is integrally formed with the terminal stage and suppresses the leakage of magnetic fluxes from the reactor main body while maintaining the opening opened.

The invention relates to an electrical transformer (T, T′) comprising: a primary central winding (11a) extending around an axis (X) and configured to generate a central magnetic flux when a current is passed through it circulating in a first direction around the axis (X), two peripheral primary windings (12a, 13a) extending around the axis (X), between which the central primary winding (11a) is located, and configured to generate peripheral magnetic fluxes when currents are passed through same respectively circulating in a second direction around the axis (X) which is opposite to the first direction, the peripheral magnetic fluxes superimposing on the central magnetic flux, wherein the windings are further configured in such a way that the peripheral magnetic fluxes compensate the central magnetic flux in the regions located beyond the peripheral windings.

Unique systems, methods, techniques and apparatuses of a power transformer are disclosed. One exemplary embodiment is a transformer comprising a core; a first winding wound around the core; a second winding coaxially wound around the first winding so as to surround the first winding and forming an air gap between the first winding and second winding; and a plate having a relative permeability greater than 1 and less than 25 structured to be inserted into the air gap.

High voltage DC generators based on a resonant tank include power inductors. As the demands on power output increase, but the demands on size of such high voltage DC generators decrease, the effect of radiated magnetic emissions become more significant. The present invention concerns a design for an inductive device, and a method for the assembly of an inductive device, in which a winding facing surface of the inductive device is a continuous portion, so that no air gap is present facing the winding facing surface. This reduces leakage of magnetic flux from the inductive device.

A magnetic coupling coil component includes: a main body including a first region, a second region disposed on a top side of the first region, and a third region disposed on a bottom side of the first region; a top-side coil conductor provided in the second region of the main body and wound around a coil axis extending in a top-bottom direction; and a bottom-side coil conductor provided in the third region of the main body and wound around the coil axis. The top-side coil conductor includes a plurality of top-side conductive patterns, and the plurality of top-side conductive patterns include a first top-side conductive pattern which is positioned closest to the first region among the plurality of top-side conductive patterns, and a number of turns of the first top-side conductive pattern is larger than an average of numbers of turns of the plurality of top-side conductive patterns.

Various embodiments include an inductor assembly for a converter comprising: a plurality of first conductors arranged on respective legs of a first magnetic core; a second magnetic core with one or more legs, the second core magnetically coupled to the first core via an air-gap and arranged to provide a path for common mode magnetic flux of the plulrality of first conductors; and a respective second conductor corresponding to each of the plurality of first conductors. Each pair of first and second conductors is electrically connected in series. The second conductors are arranged on a single leg of the second core and positively coupled to each other.