A three-phase AC reactor according to an embodiment of the present invention includes three-phase coils that are not arranged in parallel, an input and output terminal block having an input and output unit having a parallel arrangement, and an external connection position change unit disposed between a coil end of each of the three-phase coils and the input and output terminal block to connect the coil end to the input and output terminal block.

A three-phase AC reactor according to an embodiment of the present invention includes three-phase coils that are not arranged in parallel, an input and output terminal block having an input and output unit having a parallel arrangement, and an external connection position change unit disposed between a coil end of each of the three-phase coils and the input and output terminal block to connect the coil end to the input and output terminal block.

This application provides a planar transformer and a switching power adapter. The planar transformer includes a PCB winding and two magnetic cores. The two magnetic cores wrap two sides of a winding body of the PCB winding to form a closed magnetic loop. A first group of welding points is disposed on a primary-side wire side of the PCB winding, and a second group of welding points is disposed on a secondary-side wire side of the PCB winding. The planar transformer is directly welded to an external circuit board by using the first group of welding points and the second group of welding points. In this way, no pin needs to be welded on the PCB winding board. In addition, the planar transformer can be vertically installed on the external circuit board by using the first group of welding points and the second group of welding points.

This application provides a planar transformer and a switching power adapter. The planar transformer includes a PCB winding and two magnetic cores. The two magnetic cores wrap two sides of a winding body of the PCB winding to form a closed magnetic loop. A first group of welding points is disposed on a primary-side wire side of the PCB winding, and a second group of welding points is disposed on a secondary-side wire side of the PCB winding. The planar transformer is directly welded to an external circuit board by using the first group of welding points and the second group of welding points. In this way, no pin needs to be welded on the PCB winding board. In addition, the planar transformer can be vertically installed on the external circuit board by using the first group of welding points and the second group of welding points.

A sintered material contains Fe in an amount of from 8 mol % to 37 mol % in terms of Fe.sub.2O.sub.3, Zn in an amount of from 30 mol % to 60 mol % in terms of ZnO, Cu in an amount of from 1 mol % to 7 mol % in terms of CuO, Ni in an amount of from 3 mol % to 17 mol % in terms of NiO, and Si in an amount of from 7 mol % to 28 mol % in terms of SiO.sub.2. A mole ratio (SiO.sub.2/Fe.sub.2O.sub.3) of the SiO.sub.2 to the Fe.sub.2O.sub.3 is from 0.2 to 3.5. The sintered material contains B in an amount of from 0.05 mol parts to 0.5 mol parts.

A sintered material contains Fe in an amount of from 8 mol % to 37 mol % in terms of Fe.sub.2O.sub.3, Zn in an amount of from 30 mol % to 60 mol % in terms of ZnO, Cu in an amount of from 1 mol % to 7 mol % in terms of CuO, Ni in an amount of from 3 mol % to 17 mol % in terms of NiO, and Si in an amount of from 7 mol % to 28 mol % in terms of SiO.sub.2. A mole ratio (SiO.sub.2/Fe.sub.2O.sub.3) of the SiO.sub.2 to the Fe.sub.2O.sub.3 is from 0.2 to 3.5. The sintered material contains B in an amount of from 0.05 mol parts to 0.5 mol parts.

An electronics assembly includes a plurality of planar conductive metal sheets including a first conductive metal sheet, a second conductive metal sheet attached and electrically coupled to the first metal sheet, and a third conductive metal sheet attached and electrically coupled to the second metal sheet. The second metal sheet is located between the first and third conductive metal sheets. Air gaps are defined in the plurality of planar conductive metal sheets to form metal traces that define electrically isolated conductive paths from an outer surface of the first conductive metal sheet to an outer surface of the third conductive metal sheet in a multilevel conductive wiring network. The multilevel conductive wiring network can be attached and electrically coupled to a microchip and to one or more capacitors to form a power converter.

An ignition coil includes a center core, a first core member, and a second core member. The first core member includes a first core-facing portion facing a front core surface of the center core and a first core side portion extending rearward from the first core-facing portion. The second core member includes a second core-facing portion facing a rear core surface of the center core and a second core side portion extending frontward from the second core-facing portion. The first core-facing portion has an end surface contacting a portion of the second core side portion to create a first contact region. Similarly, the second core-facing portion has an end surface contacting a portion of the first core side portion to create a second contact region. The first and second contact regions are shaped to approach frontward close to the first core side portion. This structure enhances productivity of the ignition coil.

A coil component according to one or more embodiments includes a base body having first to sixth surfaces, and a coil conductor including a winding portion that extends around a coil axis intersecting the first and second surfaces. The winding portion includes first, second, third, and fourth portions facing the third, fourth, fifth, and sixth surfaces, respectively when viewed from a direction of the coil axis. The radii of curvature of the first and second portions are both smaller than the radii of curvature of the third and fourth portions. When viewed from the direction of the coil axis, the distance between the first portion and the third surface and the distance between the second portion and the fourth surface are both larger than the distance between the third portion and the fifth surface and the distance between the fourth portion and the sixth surface.

A coil component according to one or more embodiments includes a base body having first to sixth surfaces, and a coil conductor including a winding portion that extends around a coil axis intersecting the first and second surfaces. The winding portion includes first, second, third, and fourth portions facing the third, fourth, fifth, and sixth surfaces, respectively when viewed from a direction of the coil axis. The radii of curvature of the first and second portions are both smaller than the radii of curvature of the third and fourth portions. When viewed from the direction of the coil axis, the distance between the first portion and the third surface and the distance between the second portion and the fourth surface are both larger than the distance between the third portion and the fifth surface and the distance between the fourth portion and the sixth surface.