Patent ID: 7183889

Claim:
A high-voltage transformer comprising: first and second bobbins having hollow sections, wound with a primary winding and a secondary winding respectively; first and second cores fitted into said hollow sections of the first and second bobbins; and a third core disposed close to the first and second cores, wherein said first core and said third core form a first magnetic circuit and said second core and said third core form a second magnetic circuit, and the winding direction of said primary windings around said first and second bobbins is adjusted so that the orientation of magnetic flux in said first magnetic circuit matches the orientation of magnetic flux in said second magnetic circuit inside said third core wherein said first and second cores are I-shaped cores of substantially the same shape, said third core is a sideway H-shaped core, the two I-shaped cores are arranged substantially in parallel, said H-shaped core is interposed between the two I-shaped cores and the three cores are combined together to form a shape like a number “8” when represented by a 7 segment LED and both said first magnetic circuit and said second magnetic circuit are formed as closed magnetic circuits.