A contactless charging apparatus and method for contactless charging are disclosed. In one embodiment of the contactless charging apparatus, a primary electromagnetic structure and a secondary electromagnetic structure are disposed in an opposing relationship with primary wedges of the primary electromagnetic structure facing secondary wedges of the secondary electromagnetic structure with a non-magnetic gap therebetween. Coils may be positioned in spaces defined by circumferentially slotted areas between the primary and the secondary concentric cores. A non-resonance circuit is formed between the primary electromagnetic structure and the secondary electromagnetic structure to provide a contactless electrical energy transmission from the primary electromagnetic structure to the secondary electromagnetic structure with the use of a time-varying electromagnetic field.

The present invention is aimed to provide a quadrupole mass spectrometer that is less thermally affected by a transformer, the quadrupole mass spectrometer including: an ionizer unit that ionizes a sample; a quadrupole unit that has two pairs of opposing electrodes that selectively pass ions generated in the ionizer unit; a voltage applying unit that applies a voltage obtained by superimposing a high-frequency voltage V cos t over a DC voltage U and to each pair of the two pairs of opposing electrodes; and an ion detecting unit that detects ions having passed through the quadrupole unit, wherein the voltage applying unit includes the transformer that transforms the high-frequency voltage V cos t, and the transformer includes a toroidal core, and a primary winding and a secondary winding that are wound around the toroidal core, and the primary winding is formed of a metal conductor having a plate-like shaped.

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.

An embedded magnetic component device includes a magnetic core located in a cavity in an insulating substrate. An electrical winding includes inner and outer conductive connectors. An inner solid bonded joint boundary is located between first and second portions of the insulating substrate and extends between the cavity and the inner conductive connectors. An outer solid bonded joint boundary is located between the first and the second portions of the insulating substrate extends between the cavity and the outer conductive connectors. The minimum distance of the inner solid bonded joint boundary between any of the inner conductive connectors and the inner interior wall of the cavity is defined as D1, and the minimum distance of the outer solid bonded joint boundary between any of the outer conductive connectors and the outer interior wall of the cavity is defined as D2. D1 and D2 are about 0.4 mm or more.

Closed loop current transducer includes a fluxgate sensing unit, a compensation coil wound around the fluxgate sensing unit, and a transducer housing mounted around the compensation coil, the fluxgate sensing unit comprising a fluxgate housing, a ring-shaped fluxgate magnetic field detector mounted in the fluxgate housing, and a magnetic shield mounted in the fluxgate housing, the magnetic shield surrounding the fluxgate magnetic field detector. The fluxgate housing includes first and second central parts, each central part comprising a radially inner side wall, a radially outer side wall and a base wall joining the inner side wall to the outer side wall, a sensor housing portion being formed on one side of the base wall and receiving the fluxgate magnetic field detector therein.

A coil device comprising a pair of coil members annularly assembled at two connecting end portions; each coil member comprising a magnetic core, a resin case substantially entirely surrounding the magnetic core, and a coil wound around the resin case; the resin case having connecting means and guide means in the connecting end portion of each coil member; and the connected coil members being adhered to each other in the connecting end portions.

An embedded coil assembly embodiment includes a ferrite ring having an annular axis. The ferrite ring is positioned on a conductive metal surface. A plurality of separate, spaced apart conductive structures extend over the ferrite ring and are attached to the conductive metal surface in a first region of the conductive surface positioned radially outwardly of the annular axis of the ferrite ring and in a second region of the conductive surface positioned radially inwardly of the annular axis of the ferrite ring. An encapsulation layer covers, the ferrite ring and at least a portion of the plurality of conductive structures.

A magnetic core for inductor includes a first core segment, a second core segment spaced apart from the first core segment by a gap, and a spacer. The spacer is arranged within the gap and between the first core segment and the second core segment. The spacer includes a semi-conductive material to limit arc radius of magnetic flux lines communicated between the first core segment and the second core segment outside the gap. Inductors, flyback transformers and transformer rectifier units, and power conversion methods are also described.

A hand-held, water-cooled toroidal autotransformer assembly is formed from longitudinally-oriented electrically conductive radially spaced apart concentric pipes that are physically and electrically configured in series and arranged around a longitudinally-oriented toroidal magnetic core to form the windings of the autotransformer with the spaces between the longitudinally-oriented concentric pipes forming a flow path for a cooling fluid within the autotransformer.

In a method of manufacturing a plurality of embedded magnetic component devices, a row of cavities for respective magnetic cores is formed in an insulating substrate. Neighboring cavities are connected to each other by channels formed in the substrate. Adhesive is applied to a cavity floor throughout the row of cavities, and magnetic cores are inserted into the cavities. The cavities and magnetic cores are covered with a first insulating layer. Through holes are formed through the first insulating layer and the insulating substrate, and plated up to form conductive vias. Metallic traces are added to the exterior surfaces of the first insulating layer and the insulating substrate to form upper and lower winding layers. The metallic traces and conductive vias form the windings for an embedded magnetic component, such as transformer or inductor.