High-frequency amplifier apparatuses suitable for producing output powers of at least 1 kW at frequencies of at least 2 MHz for plasma excitation are disclosed. These high-frequency amplifiers include two transistors, the source or emitter connections of which are each connected to a ground connection point. The transistors can have an identical design and are arranged on a multilayer printed circuit board. The apparatus also includes a power transformer, the primary winding of which is connected to the drain or collector connections of the transistors. The primary winding and the secondary winding of the power transformer are each in the form of planar conductor tracks which are arranged in different upper layers of the multilayer printed circuit board.

A magnetic device fabrication method includes the step of using molds to respectively process a first substrate and a second substrate into respective predetermined shapes, the step of forming conductors in shaped protruding blocks of the first substrate and conducting contacts in the second substrate, the step of attaching one or more magnetic cores to the first plate member to couple one or more positioning slots to the protruding blocks of the first plate member respectively and the step of bonding one or multiple magnetic cores between the first and second substrate to provide a continuous winding type induction coil effect, saving much manufacturing labor and time.

A transformer is provided, which includes a magnetic core, a primary coil module including a coil support arranged in the magnetic core and a primary coil formed on the coil support, an upper secondary coil module including an upper insulation molded body arranged on an upper portion of the primary coil module and an upper plate coil buried in the upper insulation molded body and arranged to face the primary coil, and a lower secondary coil module including a lower insulation molded body arranged on a lower portion of the primary coil module and a lower plate coil buried in the lower insulation molded body and arranged to face the primary coil.

A magnetic device includes a base plate, a cover plate, a first winding column, a second winding column, a primary winding, a secondary winding and a supporting column. The base plate, having a first concave portion, is opposite to the cover plate. The first winding column and the second winding column are disposed between the bottom plate and the cover plate, respectively. The primary winding and the secondary winding are wound around the first winding column and the second winding column. The supporting column is disposed between the base plate and the cover plate. A first concave portion concaves from a first side of the base plate towards the first winding column and the second winding column along multiple directions. The primary winding and the secondary winding are wound and stacking along an extension direction of the first winding column and the second winding column.

A transformer includes a sequence of insulating layers layered transversely to a common plane, and a plurality of at least two galvanically separated circuits. Each circuit has at least one conductor winding, and a common magnetic core only partially surrounding the layered sequence and acting on the number of the at least two circuits. Each conductor winding is disposed on a respective one of the layers and extends parallel to the common plane. The core optionally has a core portion extending parallel to the common plane and bounds the layered sequence to one side.

An electronic component includes an insulating layer, a low voltage conductor pattern formed inside the insulating layer, a high voltage conductor pattern formed inside the insulating layer such as to face the low voltage conductor pattern in an up/down direction, and a withstand voltage enhancement structure of conductive property formed inside the insulating layer and along the high voltage conductor pattern such as to protrude further outside than the low voltage conductor pattern in plan view.

A planar magnetic component is arranged on a circuit board of a resonant converter, and the resonant converter includes a primary-side circuit and a secondary-side circuit. The planar magnetic component includes an inductor trace, a primary-side trace, a secondary-side trace, and an iron core assembly. The iron core assembly includes an inductor iron core and an iron core. The primary-side trace surrounds the first through hole in a first direction and surrounds the second through hole in a second direction to form an ?-shaped trace. The inductor trace is formed on the primary-side layer board and coupled to the primary-side trace, and two ends of the inductor trace form an input terminal and an output terminal of the planar magnetic component.

A planar transformer is applied to an isolated converter, and the isolated converter includes a primary-side circuit and a secondary-side circuit. The planar transformer includes a circuit board and an iron core, and the circuit board includes a primary-side layer and a secondary-side layer. The circuit board is arranged in the isolated converter, and the primary-side layer and the secondary-side layer include a primary-side trace and a secondary-side trace respectively. The primary-side trace is formed on the primary-side layer and serves as a primary-side coil coupled to the primary-side circuit. The secondary-side trace is formed on the secondary-side layer and serves as a secondary-side coil coupled to the secondary-side circuit. The iron core includes a core pillar, the core pillar penetrates through a through hole of the circuit board, and the primary-side trace and the secondary-side trace surround the through hole.

A planar transformer is configured on a multi-layer circuit board of a resonant converter. The planar transformer includes multiple layers of primary-side traces, multiple layers of secondary-side traces, and an iron core. The primary-side traces serve as a primary-side coil of the transformer to generate a first direction magnetic flux when the resonant converter operates. The secondary-side traces serve as a secondary-side coil of the transformer to generate a second direction magnetic flux when the resonant converter operates. The primary-side traces and the secondary-side traces surround a first core pillar and the second core pillar, and the primary-side traces and the secondary-side traces are configured in a specific stacked structure on the multi-layer circuit board, so that a magnetomotive force of the planar transformer can maintain balance during the operation of the resonant converter.

A planar magnetic component is arranged on a circuit board of a resonant converter, and the resonant converter includes a primary-side circuit and a secondary-side circuit. The planar magnetic component includes an inductor trace, an inductor iron core, and a current transformer trace. The inductor trace is arranged on the primary-side circuit and formed one layer board of the circuit board to serve as a resonant inductor coupled to the primary-side circuit. The inductor iron core includes a core pillar, and the core pillar penetrates a through hole of the circuit board, and the inductor trace surrounds the through hole. The current transformer trace is formed on the circuit board to serve as a current transformer coil coupled to the resonant inductor. The current transformer trace surrounds the through hole to form a common-core structure that shares the inductor iron core.