Patent ID: 8395470

Claim:
An asymmetrical planar transformer, comprising: a circuit board, the circuit board forming a via hole; a winding rack, the winding rack comprising a first annular plate, a second annular plate, a third annular plate, a tubular shell, and a through hole; a primary winding, the primary winding disposed between the first annular plate and the second annular plate, and the primary winding electrically connected with the circuit board; a secondary winding, the secondary winding having an annular shape and disposed between the second annular plate and the third annular plate, the secondary winding electrically connected with the circuit board; and a magnetic core assembly, comprising a magnetic core; wherein the magnetic core is penetrating through the via hole of the circuit board and the through hole of the winding rack, and the through hole is passed through the secondary winding, the first annular plate, the second annular plate, and the third annular plate, wherein the first annular plate, the second annular plate, and the third annular plate are arranged in parallel, the position of the through hole is corresponding to that of the via hole, the winding rack further comprises a fourth annular plate and at least one magnetic annular plate, and the magnetic annular plate is disposed between the second annular plate and the fourth annular plate.