Encapsulated high efficiency transformer and power supply

A high efficiency fully encapsulated power transformer apparatus comprising:

• (a) a magnetic core member having a plurality of generally planar E and I core pieces, said core pieces being stacked such that planar surfaces of opposing core pieces generally abut one another;
• (b) a unitary bobbin having a plurality of terminal receiving slot means, said bobbin having a first flange, a second flange, and a third flange, wherein said first and second flanges form a first winding form, and second and third flanges form a second winding form, said bobbin including walls forming a tapered central aperture for accepting and retaining said core pieces, said aperture being tapered on at least one wall that is generally parallel to said planar surfaces of said core pieces, whereby said core pieces are compressed in a direction generally perpendicular to the planar surfaces thereof, said bobbin having a plurality of extended tabs protruding from said first and third flanges;
• (c) a first winding on said first winding form;
• (d) a second winding on said second winding form;
• (e) a terminal means inserted into said terminal slot means for electrical connection to said first and second windings;
• and
• (f) a bobbin and core member encapsulation formed of an encapsulant substantially covering and substantially conforming to said bobbin and said core member, said encapsulant being formed of a material selected from the group consisting of a thermoplastic material, a thermosetting material, or mixtures thereof.