Study on PCB Based Litz Wire Applications for Air-Core Inductor and Planar Transformer

Planar magnetic devices have played an important role in many applications to increase performance because of the advantages it bears such as low profile and ease of manufacture. Meanwhile litz wire is a solution to improve it further by reducing ac resistance. Studies of printed circuit board (PCB) litz wire structure on planar air-core inductor and planar transformer are presented in this paper along with several theoretical analyses of resistance and inductance of PCB litz wire. Also, a novel litz wire planar transformer and 2 designs of litz wire air-core inductors are presented, simulated and tested, which shows promising results compared to conventional solid or parallel wire designs for high operating frequency operations.