Transformer coil, winding method of transformer coil and transformer

Abstract

The invention discloses a transformer coil. The transformer coil comprises a U-shaped magnetic core and a wire, wherein the U-shaped magnetic core comprises a first magnetic column and a second magnetic column; the wire consists of a plurality of strands of sub-wires; the wires are wound on both the first magnetic column and the second magnetic column; the number sum of turns of the wires wound around the first magnetic column and the second magnetic column is 2N+1; N is a positive integer which is greater than or equal to zero; a first sub-wire is formed by part of the sub-wires of at least one turn of wire, and a second sub-wire is formed by the other part of the sub-wires; the first sub-wire is wound around the first magnetic column, and the second sub-wire is wound around the second magnetic column. The invention further discloses a winding method of the transformer coil and a transformer. When the number sum of turns of the wires wound around the first magnetic column and the second magnetic column is an odd number, the wires wound around the first magnetic column and the second magnetic column can be effectively balanced, so that the number of turns of the wires wound around the first magnetic column substantially accords with the number of turns of the wires wound around the second magnetic column, and the coupling coefficient of the transformer is improved.