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Transformer

  • US 7,978,041 B2
  • Filed: 07/14/2009
  • Issued: 07/12/2011
  • Est. Priority Date: 04/16/2009
  • Status: Expired due to Fees
First Claim
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1. A printed circuit board transformer comprisingat least one primary winding (3,5) and one secondary winding (11), each in the form of at least one layer of turns inside or at the surface of a printed circuit board (9), said transformer having a turn ratio of said primary winding to said secondary winding differing from 1:

  • 1 to achieve a step-up/down-operation,wherein each of said two layers has an elongated winding element (12, 13, 13

    , 13

    , 13



    ) substantially following an elongated winding element of the other layer while being in an overlapping relationship therewith as seen perpendicularly to said printed circuit board (9) over substantially the entire extension of said winding elements,a second (11) of said layers belonging to said secondary winding has a fewer number of turns than the number of turns of a first (10) of said layers belonging to said primary winding, andsaid second winding layer (11) comprises a segment (16, 16

    ) of a plurality of said elongated winding elements (13, 13

    , 13

    , 13



    ) connected in parallel with each other within said layer (11) and configured to extend within said layer (11) such that each said elongated winding element is in said overlapping relationship with an elongated winding element (12) in said first winding layer (10).

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