A resonant coil with integrated capacitance includes at least one separation dielectric layer and a plurality of conductor layers stacked in an alternating manner. Each of the plurality of conductor layers includes a first conductor sublayer and second conductor sublayer having common orientation and a sublayer dielectric layer separating the first and second conductor sublayers. Adjacent conductor layers of the plurality of conductor layers have different orientations.

A dielectric fluid is provided comprising a natural bio-sourced oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.

A dielectric fluid is provided comprising an oil and one or more compounds selected from the group consisting of phosphite compounds. It has been discovered that addition of one or more compounds selected from the group consisting of phosphite compounds to dielectric fluids comprising oil impart a stabilizing effect that reduces, inhibits or prevents formation of stray gases in the dielectric fluid during ordinary use.

This present disclosure discloses a transformer. The transformer comprises a lithium battery pack, a transformer coil and 2N switches. The lithium battery pack comprises N single batteries connected in series. The transformer coil comprises a magnetic core, N first windings and N second windings. The N first windings combined into one strand, the N second windings combined into one strand, are then wound on the magnetic core respectively. The N first windings and the N second windings have same number of coil turns, same homonymous ends and same common ends. Two ends of each single battery are connected with one first of the first windings and one of the second windings in parallel respectively. Each first winding is connected with one switch in series. Each second winding is connected with one switch in series. N is a natural number greater than or equal to 1.

A radio-frequency (RF) transformer includes a ferrite core defining a bore therethrough. The RF transformer also includes a first wire and a second wire. The first and second wires are twisted and form a first exterior half loop at least partially around an exterior of the ferrite core. The first wire, but not the second wire, forms a second exterior half loop at least partially around the exterior of the ferrite core. The ferrite core is configured to provide a primarily magnetic coupling for signals having a frequency that is less than a predetermined threshold. The first and second wires are configured to provide a primarily capacitive coupling for signals having the frequency that is greater than the predetermined threshold.

A sparse routing coil structure for a magnetic coil in a wireless charging system is disclosed. The sparse routing coil structure may include a magnetic coil routed by turns of a wire and a turn spacing S between adjacent turns of the wire. The turn spacing S may be a space between adjacent turns of the wire, and a turn width is denoted as W. A ratio of W/S may be not larger than 10.

An inductance communication coil, including a conductor having at least one conductive turn, wherein a width of the conductor is wider at a first location relative to that at a second location. The conductor can be made out of metal. In some embodiments, the first location and the second location are on the same turn. In some embodiments, the conductor includes a plurality of turns, wherein the first location is at a first turn and the second location is at a second turn.

An inductor includes a core including a columnar shaft and a pair of supports on respective end portions of the shaft, a terminal electrode disposed on each support, and a wire wound around the shaft and having two end portions connected to the terminal electrodes, corresponding to the two end portions, on the supports. In the inductor, an impedance is approximately 500 or higher with respect to an input signal having a frequency of approximately 3.6 GHz.

An air cooling system, method, apparatus and kit applied to lower transformer operating temperatures, such as governed by a tank or container of oil, allowing transformer components to run more efficiently at a lower temperature level, e.g., down from the hot level operating temperatures typical in stressed conventional devices. By lowering the operational levels to within or below the nominal operational temperature ranges for the equipment, and recovering heat generated during operation, several advantages are obtained.

Disclosed herein is a common mode filter that includes a winding core part including first to third winding areas and first and second wires wound in a same direction around the winding core part and crossing each other in the third winding area. The first wire is aligned and wound in the first and second winding areas, and the second wire is aligned and wound on the first wire in the first and second winding areas, whereby a plurality of winding blocks are formed. The winding blocks include a first winding block positioned in the first winding area and second and third winding blocks positioned in the second winding area. The second wire constituting the second winding block and the second wire constituting the third winding block are separated from each other.