Transformer and spiral flat winding thereof

A transformer, comprising:

• a bobbin having a primary side portion, a secondary side portion and a separating plate, the primary side portion having a first through hole, the secondary side portion having a second through hole, the separating plate having a third through hole, the separating plate being provided between the primary side portion, and the secondary side portion, the first, the second and third through holes being in communication with each other;
• an iron core penetrating the first, second and third through holes;
• and
• two spiral flat windings being formed from a plurality of flat loops, the two spiral flat windings being provided on both sides of the separating plate and surrounding the primary side portion and the secondary side portion respectively.

A method for assembling a transformer, comprising the steps of:

• providing a bobbin, the bobbin comprising a primary side portion, a secondary side portion and a separating plate, the primary side portion, the secondary side portion and the separating plate having a first through hole, a second through hole and a third through hole respectively;
• providing two spiral flat windings each being formed from a plurality of flat loops;
• connecting the two spiral flat windings to one end of the primary side portion and the secondary side portion respectively;
• connecting one end of the primary side portion and the secondary side portion to both sides of the separating plate respectively with the first, second and third through holes being in communication with each other, both sides of the separating plate abutting one end of the two spiral flat windings respectively, so that the flat loops are arranged tightly;
• and
• providing an iron core, the iron core penetrating the first, second and third through holes.