Magnetic core center post of planar transformer

The invention relates to a transformer magnetic core middle column, in particular to a planar transformer magnetic core middle column which comprises a magnetic core body, a winding cavity is formed in the magnetic core body, a magnetic core middle column body is fixedly installed in the center of the magnetic core body, and secondary side copper foil is wound on the outer portion of the magnetic core middle column body in an array mode. The cross section of the magnetic core middle column is cut into a circle, one end of an incoming and outgoing line of the primary winding can directly enter and exit from the outermost side of the primary winding, and the other end of the incoming and outgoing line can be led out from the innermost side of the winding to the upper part or the lower part of the outermost side winding along the notch of the magnetic core middle column; according to the lead mode, no more large gap exists between the primary side and the secondary side, it can be guaranteed to a great extent th