A radio frequency apparatus includes a power amplifier circuit, a signal coupling circuit, an extraction circuit, and a harmonic filter circuit. The power amplifier circuit is configured to amplify a differential signal to output a to-be-filtered signal. The signal coupling circuit includes a primary side inductor and a secondary side inductor. The signal coupling circuit is configured to convert the to-be-filtered signal received by the primary side inductor into a single-ended signal outputted from the secondary side inductor. The extraction circuit has a center tap. The extraction circuit is configured to inductively couple to the primary side inductor and output a common mode signal from the center tap. The harmonic filter circuit is configured to perform a harmonic filtering on the single-ended signal according to the common mode signal, such that the secondary side inductor of the signal coupling circuit outputs a filtered signal.

An induction heating assembly for a vapour generating device comprises includes an induction coil and a heating compartment arranged to receive an induction heatable cartridge. A first electromagnetic shield layer is arranged outward of the induction coil and a second electromagnetic shield layer is arranged outward of the first electromagnetic shield layer. The first and second electromagnetic shield layers differ in one or both of their electrical conductivity and their magnetic permeability.

A superconducting coil module includes: a first coil composed of a superconducting wire material wound multiple times; and a first heating device coupled to one surface of the first coil and including at least one first heating pattern controlling a threshold current for each turn of the first coil as a minimum threshold current, wherein at least one first heating pattern is disposed on a path according to a predetermined ratio between the inner and outer boundaries of the first coil.

The present invention suppresses leakage magnetic field. A power transfer coil configured to transmit or receive power includes: an inner coil; a first outer coil formed so as to surround the inner coil such that a magnetic flux opposite in phase to a magnetic flux outside the inner coil is generated outside the first outer coil, the first outer coil having one end connected to a first terminal and the other end connected to one end of the inner coil; and a second outer coil formed so as to surround the inner coil such that a magnetic flux opposite in phase to the magnetic flux outside the inner coil is generated outside the second outer coil, the second outer coil having one end connected to a second terminal and the other end connected to the other end of the inner coil.

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 transformer is provided, which includes a tank having an enclosed volume with an insulating material, the tank including at least one channel extending through the tank, wherein the interior of the at least one channel is separated from the enclosed volume of the tank by a channel wall. A transformer core is provided outside of the enclosed volume, including at least one core leg extending through the tank via the at least one channel. At least one coil is located inside the enclosed volume, the coil being wound about the at least one channel, the tank has an inner wall or outer wall including a weakly-conductive layer, which includes fibers embedded in an impregnating material.

A multilayer coil component includes an inner conductor, a component element assembly including the inner conductor, and outer conductors disposed at respective end portions of the component element assembly. The component element assembly has a first region in which the primary component is composed of a magnetic material and which may contain a nonmagnetic material and second regions which are disposed at respective end portions of the first region and which contain at least a nonmagnetic material. Each second region is disposed having a greater volume content of the nonmagnetic material than the first region such that, for example, the difference in the volume content results about 25% by volume or more. The coil portion of the inner conductor is embedded in the first region, and the length of the second region is greater than or equal to the length of the side-surface folded portion of the outer conductor.

A multilayer coil component includes an inner conductor, a component element assembly including the inner conductor, and outer conductors disposed at respective end portions of the component element assembly. The component element assembly has a first region in which the primary component is composed of a magnetic material and which may contain a nonmagnetic material and second regions which are disposed at respective end portions of the first region and which contain at least a nonmagnetic material. Each second region is disposed having a greater volume content of the nonmagnetic material than the first region such that, for example, the difference in the volume content results about 25% by volume or more. The coil portion of the inner conductor is embedded in the first region, and the length of the second region is greater than or equal to the length of the side-surface folded portion of the outer conductor.

A planar inductor may include a first coil and a second coil. The first coil may include a first trace that forms a first set of turns. The second coil may include a second trace that forms a second set of turns. A distance between the turns of the first set of turns may be equal to a distance between the turns of the second set of turns. A width of the first trace may be equal to a width of the second trace. The first coil and the second coil may be physically positioned or sized according to a/b in which a represents the width of the first trace and b represents the distance between the turns of the first set of turns.

An electric power converter includes an electric gatedriver circuit that includes a transformer. The transformer includes separate first and second cores of magnetically conductive material that are shaped to form respective closed loops. The transformer also includes a first electrical conductor with at least one winding arranged around a part of the first core in a first winding direction and at least one winding arranged around a part of the second core in a second winding direction opposite the first winding direction. The transformer further includes a second electrical conductor with at least one winding arranged around a part of the first core in the first winding direction and at least one winding arranged around a part of the second core in the second winding direction so as to counteract electric influence induced by a common magnetic field through the closed loops of the first and second cores.