Choosing an Optimal Number of Strands in a Litz-Wire Transformer Winding

A salient difficulty in designing high-frequency inductors and transformers is eddy-current effects in windings. These effects include skin-effect losses and proximity-effect losses. Both effects can be controlled by using Litz wire—conductors made up of multiple individually insulated strands twisted or woven together.

This paper authored by C. R. Sullivan:

  • addresses the choice of the degree of stranding in Litz wire for a transformer winding and
  • presents a method of finding that optimum, using standard methods of estimating the eddy-current losses.

IEEE Transactions on Power Electronics, vol. 14, no. 2, pp. 283–291.

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