Principle of planar high frequency transformer structure
Planar high frequency transformers usually have two or more cylindrical cores of the same size. The structure of the planar transformer with two magnetic cores is introduced, as shown in figure 1. Each core column is connected at two angles on the diagonal by a copper sheet that is attached to the inner wall of the core as it passes through the core. Two core placed side by side, the adjacent two horns with copper welding, on the outside of a core of a two Angle on the surface of the copper sheet with a piece of copper welded together, this is the center of the planar transformer secondary coil, if lead to tap here, is the center of the secondary coil tap; The copper on the two corners of the outer surface of the other core is the two ends of the secondary coil of the planar transformer. This basically constitutes a planar transformer main part. Its secondary coil has only one turn and can have a central tap. A complete energy storage inductors, planar transformer and a preset it often meet in the center tap, at the end of the upper and lower each have a fixed copper, they will be core and filter inductance caught in the middle, at the same time as the poles of rectifying power supply and the cooling plate.
Thus, high frequency planar transformer is made up of copper lead frame and flat copper continuous spiral form, instead of the conventional magnetic copper wire winding on ferrite core, the spiral is coated sheet material of copper foil etching, and piled them on flat on the high frequency ferrite core, transformer magnetic circuit. The core material is then bonded with small grain size epoxy resin to minimize core loss, and the high temperature (130) insulation material inside the helix lamination ensures high insulation between the windings.
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