Three-phase high frequency transformer

A three-phase high frequency transformer comprising:

• three solid-cylindrical cores that are formed of ferrite and that are disposed at uniform intervals on a circumference;
• a ceiling plate formed of ferrite and connected to first ends of the solid-cylindrical cores;
• a bottom plate formed of ferrite and connected to second ends of the solid-cylindrical cores;
• and three sets of coils having primary coils of a predetermined inner diameter formed by flat wires wound edgewise, and secondary coils that have an inner diameter that is the same as the inner diameter of the primary coils and are formed of flat wires wound edgewise, the flat wires forming the secondary coils having at least one of a width or a thickness different than those of the flat wires forming the primary coils, each of the flat wires of the primary coils and the secondary coils having a larger measurement in a width direction than in a thickness direction,
• wherein the primary coils and the secondary coils are configured such that high frequency current flows therein,
• wherein both the primary coils and the secondary coils are helical coils,
• wherein the flat wires structuring the secondary coils are inserted within intervals of the flat wires structuring the primary coils, or the flat wires structuring the primary coils are inserted within intervals of the flat wires structuring the secondary coils, and the three sets of coils are structured such that inner peripheries of the primary coils and inner peripheries of the secondary coils coincide, and are disposed such that the respective solid-cylindrical cores are inserted in respective inner portions of the three sets of coils,
• wherein the primary coils and the secondary coils are Δ-connected,
• wherein each of the three primary coils of the three sets of coils is Δ-connected by connecting one end of one primary coil to the other end of another primary coil by a first connecting line,
• wherein each of the three secondary coils of the three sets of coils is Δ-connected by connecting one end of one secondary coil to the other end of another secondary coil by a fourth connecting line,
• wherein the first connecting line is a conductor associated with each of the three primary coils and arranged outside each of the three sets of coils and extending along the solid-cylindrical cores,
• wherein the fourth connecting line is a conductor associated with each of the three secondary coils and arranged outside each of the three sets of coils and extending along the solid-cylindrical cores,
• wherein at least the first connecting line is a plate-shaped conductor that comprises a vertical section and a horizontal section;
• the first connecting line is disposed at the side of one of the top plate core and the bottom plate core along one of the upper and lower surface of one of the top plate and bottom plate core,
• wherein at least one winding end portion of one of the primary coils is connected by a bolt to the upper end of the first connecting line in the vertical direction and another primary coil has a winding end portion that is connected to the lower end of first connection line that is bent in the horizontal direction,
• wherein at least the fourth connecting line is a plate-shaped conductor that comprises a vertical section and a horizontal section, the fourth connecting line is disposed at side of one of the top plate core and the bottom plate core along one of the upper and lower surface of one of the top plate and bottom plate core, and
• wherein at least one winding end portion of one of the secondary coils is connected by a bolt to the upper end of the fourth connecting line in the vertical direction and another secondary coil has a winding end portion that is connected to the lower end of fourth connection line that is bent in the horizontal direction.