Patent ID: 9142346
Filing Date: 2015-09-22
Classification: H01F

Abstract:
1. A transformer comprising a pair of first coils and at least one second coil that are stacked so that the at least one second coil is interposed between the first coils in a common winding axial direction of the first and second coils, wherein each of the first coils is covered by insulating films and integrated with the insulating films into an integrated body, so that the first coils are electrically insulated from the at least one second coil, and wherein the integrated bodies, each of which is comprised of one of the first coils and the insulating films covering the one of the first coils, are integrally formed of a single coil sheet, in the coil sheet, the integrated bodies are connected with each other via a connecting portion, the coil sheet is folded at the connecting portion so that the integrated bodies are superposed in the winding axial direction with the at least one second coil interposed therebetween in the winding axial direction, the connecting portion of the coil sheet includes therein a connecting electric conductor that connects the first coils included in the respective integrated bodies, the connecting electric conductor is integrally formed with the first coils into one piece, each of the first coils is comprised of a plurality of coil segments that are stacked in the winding axial direction, between each adjacent pair of the coil segments, there is interposed an insulating film so as to electrically insulate the coil segments from each other, and each of the coil segments is interposed between an adjacent pair of the insulating films in the winding axial direction.