Increasing Current Capability of Air-Core Planar Inductors Capable of Suppressing Eddy Currents

This paper proposes a new winding structure that enables planar inductors to carry large current by increasing the number of stacks of the substrate with inner layer vias between the winding pattern on a two-layer printed circuit board (PCB). The relationship between the operating frequency and the winding pattern width was theoretically calculated, and a planar inductor that can carry a large current of 36 Arms without increasing AC resistance due to eddy current up to 20 kHz was designed and manufactured. The effectiveness of the proposed structure was verified through experiments.