Method of making a transformer having a stacked core with a cruciform leg

A method of forming a transformer comprising:

• (a.) providing a plurality of outer leg plates;
• (b.) providing a plurality of inner leg plates, wherein not all of the inner leg plates have the same width;
• (c.) providing a plurality of yoke plates, each of the yoke plates having a one-piece construction and an outer side and an inner side with a V-shaped notch formed therein, the V-shaped notch being located inwardly from the outer side, and wherein all of the yoke plates have the same width;
• (d.) stacking the outer leg plates, the inner leg plates and the yoke plates to form a pair of outer legs, a yoke with a groove, and an inner leg having a first end disposed in the groove, wherein the outer legs comprise the outer leg plates, the inner leg comprises the inner leg plates and the yoke comprises the yoke plates, the groove extending in a stacking direction of the yoke and being formed by the V-shaped notches of the yoke plates, wherein the inner leg plates are stacked so as to provide the inner leg with a cruciform cross-section and the yoke plates are stacked so as to provide the yoke with a rectangular cross-section;
• and
• (e.) mounting a coil winding to the inner leg.