PLANAR TRANSFORMER

摘要

PURPOSE: A planar transformer is provided to secure enough leakage inductance inside the planar transformer without a leakage inductor outside or cores with small permeability. CONSTITUTION: A plurality of coils is laminated in a first upper part secondary winding. The first upper part secondary winding is arranged by surrounding a first left direction protrusion of a first left side planar core on a primary winding. A plurality of coils is laminated in a second upper part secondary winding. The second upper part secondary winding is arranged separately in the first upper part secondary winding and surrounds a first right direction protrusion of a first right side planar core on the primary winding. An eleventh main body(1111) is formed by a magnetic material of a tetragonal shape. An eleventh rear side protrusion(1112) is formed with extension in a rear side edge of the eleventh main body. An eleventh front side protrusion is formed with extension in a front side edge of the eleventh main body.