Patent ID: 7256677

Claim:
A transformer comprising: (a.) a core comprising: a first yoke comprising a stack of plates and having an outer side and an inner side with a groove formed therein, said groove extending in a stacking direction of the plates and being located inwardly from the outer side, said plates having the same width so as to provide the first yoke with a rectangular cross-section; a second yoke comprising a stack of plates and having an outer side and an inner side with a groove formed therein, said groove extending in the stacking direction of the plates and being located inwardly from the outer side; an inner leg having a first end disposed in the groove of the first yoke and a second end disposed in the groove of the second yoke, said inner leg having a cruciform cross-section and comprising a stack of plates with different widths; and (b.) a coil winding mounted to the inner leg.