Patent ID: 6593837
Filing Date: 2003-07-15
Classification: H01F

Abstract:
A transformer apparatus comprising:a core member including a base portion, a center core portion fixed at a central part of a principal plane of the base portion to stand to be one body with the base portion, and at least three side core portions situated at regular intervals from each other around the center core portion in peripheral parts on the principal plane of the base portion and fixed to stand to be a single body with the base portion; a primary coil of a predetermined number of turns, said primary coil being disposed at an outer periphery portion of the center core portion; a first plate coil member formed in a basic shape of a frame-like body having side portions surrounding an outside of each of the side core portions respectively; a second plate coil member formed in a basic shape of a frame-like body having side portions surrounding the outside of each of the side core portions respectively, said second plate coil member being combined with said first plate coil member having an insulating layer put therebetween in a laminated state; and a plurality of connecting coil pieces formed by being respectively cantilevered by each of the side portions of said second plate coil member correspondingly to each of the side core portions of said core member, said connecting coil pieces having free ends respectively, each of the free ends extending to surround an outer periphery portion of each corresponding side core portion and further extending to be opposed to each adjoining side portion, wherein the free end of each of said connecting coil piece is connected with said first plate coil member to form a unit secondary coil by means of said first plate coil member and said second plate coil member.