Power conversion device and a magnetic assembly

A magnetic assembly, comprising a substrate and a magnetic core assembly, wherein the magnetic core assembly comprises a magnetic column, an upper magnetic plate and a lower magnetic plate, and the magnetic column is arranged between the upper magnetic plate and the lower magnetic plate;

• wherein the magnetic core assembly comprises a first side and a third side opposite to each other, and a second side and a fourth side opposite to each other;
• wherein the substrate comprises a hole-groove and a winding, the winding is arranged in the substrate or on the surface of the substrate, the hole-groove is used for the magnetic column to pass through, and the upper magnetic plate and the lower magnetic plate are respectively assembled to the winding from an upper surface of the substrate and a lower surface of the substrate;
• the magnetic column comprises a middle column, two first side columns and one second side column;
• the middle column is surrounded by the two first side columns and the second side column, and an enclosed angle around the middle column is greater than 180 degrees;
• wherein two channels between the middle column and the two first side columns, and a channel between the middle column and the second side column are connected in series, and the series channel is used for arranging the winding.