High frequency loss evaluation in high frequency multi-winding power transformers

A high frequency power transformer (HFPT) with twin secondaries is generally analyzed with each primary ampere-turn being canceled by an equal contribution from each of the two secondaries. Such a methodology does not indicate worst case high frequency losses. This paper analyzes a high frequency power transformer (HFPT) with twin secondaries under a number of interleaving sequences. Each sequence is analyzed under five loading conditions. Under different conditions the primary ampere-turns are canceled by unequal contribution from each of the two secondaries. It is shown that the worst case high frequency losses occur when there is an extreme case of unbalance between the two secondaries