Select a reasonable toroidal Inductor Core coil size, can reduce the loss of a certain diameter of the single-layer coil (phi 20mm-30mm),When the ratio of winding length L to outer diameter D is L/D=0.7, the loss is the minimum. For multi-layer coils with a certain outer diameter, L/ D = 0.2-0.5. When t/D = 0.25-0.1, the loss is the minimum.
When the winding thickness t, winding length L and outer diameter D satisfy the condition of 3t+2L = D, the loss is also the minimum. The coil with shielding cover is adopted, which is best when L/D = 0.8-1.2.
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