Patent ID: 6407655
Filing Date: 2002-06-18
Classification: H01F

Abstract:
A toroidal transformer, having a shape defining a circular outer circumference and a circular inner circumference, comprising:a wound core having a shape defining a circular outer circumference and a circular inner circumference, formed from a single shaped band cut from a material strip, the wound core having a longitudinally-elongated cross sectional shape that is free from rectangular corners and has semi-circular end portions, the cross sectional shape being elongated in an axial direction with respect to the wound core, a ratio of a length of long side to a length of short side of said longitudinally elongated shape being in the range of 1:0.9 to 1:0.3; and a toroidal winding wound on the wound core around the circular outer and inner circumference of the wound core without an intervening bobbin.