A multi-coil inductor includes a plurality of stacked inductor units. Each of the inductor units comprises: a magnetic core in which a magnetic path is formed; and a plurality of coils which are wound around the magnetic core to form at least one winding pair. Wherein a part of the magnetic path between the adjacent inductor units is shared. In the present invention, the leakage inductance is controlled and the may be magnetic saturation of magnetic core avoided by adjusting series and parallel connections among the coils.

A multilayer coil component includes a multilayer body which includes stacked insulating layers and incorporates a coil, and outer electrodes on an outer surface of the multilayer body and are electrically connected to the coil. The coil includes coil conductors which are stacked together with the insulating layers are electrically connected together. The coil conductors each include inner and outer end faces which face each other in a direction orthogonal to a stacking direction of the multilayer body in a section in a width direction of the one of the coil conductors. At least one end face of the inner end face and the outer end face in at least one coil conductor includes a first surface and a second surface which is continuous with the first surface and is different in an angle with respect to a plane perpendicular to the stacking direction from the first surface.

An inductor includes a coil; terminals including wire connecting portions connected to lead portions of the coil, and base portions positioned at substantially the same height as a bottom surface of the coil and holding the wire connecting portions; and a core covering the coil together with the wire connecting portions and the base portions. The base portions include main branch portions and sub branch portions. Inner edges of the main branch portions are formed with curved portions curved along an outer peripheral surface of the coil at positions separated from the outer peripheral surface of the coil, respectively. Inner edges of the sub branch portions are formed with curved portions curved along the outer peripheral surface of the coil at positions separated from the outer peripheral surface of the coil, respectively.

A transformer connection method for a transformer includes a first high-frequency terminal configured as a first end of a first plate winding, a second high-frequency terminal configured as a first end of a second plate winding, and a direct current terminal connected to a second end of the first plate winding and a second end of the second plate winding. The transformer connection method comprises connecting the first high-frequency terminal and the second high-frequency terminal to a circuit board to cause the first high-frequency terminal and the second high-frequency terminal to be upright from a surface of the circuit board; and connecting the direct current terminal to a component or to the circuit board connecting with the component, the direct current terminal extending from a portion between the transformer and the circuit board to an outside.

A punching process for wireless charging coils comprises: punching a metal piece for forming a coil structure and a fixing element, the coiling structure having a plurality of coil segments, a gap being between two of the plurality of coil segments, and the fixing element connecting the coil segments for keeping the width of the gap.

A coil-type electronic component comprises an element including a magnetic element body and a coil conductor. A portion of the magnetic element body in between layers of the coil conductor adjacent to each other in an axis direction of the coil conductor includes first soft magnetic metal particles. A portion of the magnetic element body on an outer side along the axis includes second soft magnetic metal particles. The first soft magnetic metal particles have a saturation magnetization (Ms) higher than that of the second soft magnetic metal particles.

A coil electronic component includes a body having first to fourth surfaces, an insulating substrate disposed in the body, coil portions disposed on opposing surfaces of the insulating substrate, respectively, a first lead-out portion connected to one of the coil portions and exposed from the first and third surfaces, a second lead-out portion connected to another of the coil portions and exposed from the second and third surfaces, and first and second external electrodes covering the first and second lead-out portions, respectively. The insulating substrate includes a support portion supporting the coil portions, a first end portion extending from the support portion and including end surfaces respectively exposed from the first and third surfaces and spaced apart from each other, and a second end portion extending from the support portion and including end surfaces exposed from the second and third surfaces and spaced apart from each other.

Anchor conductors extending from internal terminal conductors and being in contact with a component body are provided inside the component body. The anchor conductors are provided so as not to be connected to a coil conductor including a circulating portion, and so as not to be exposed on an outer surface of the component body. The anchor conductors are in contact with the component body to thereby enhance fixing force of the internal terminal conductors to the component body.

A filter unit according to the present invention includes a substrate, capacitors mounted on the substrate, and two inductors. The inductors each include a wire and a core. The core includes two core bodies. The core bodies each have a ring shape and include a wiring hole. The capacitors are disposed between the two core bodies. An opposed section extends from the respective two core bodies to a position opposed to the capacitors C. The opposed section is opposed to all of the plurality of capacitors.

A multi-coil inductor includes a plurality of stacked inductor units. Each of the inductor units comprises: a magnetic core in which a magnetic path is formed; and a plurality of coils which are wound around the magnetic core to form at least one winding pair. Wherein a part of the magnetic path between the adjacent inductor units is shared. In the present invention, the leakage inductance is controlled and the maybe magnetic saturation of magnetic core avoided by adjusting series and parallel connections among the coils.