The DC resistance losses are well known and easy to determine. However, there are also AC losses in the power inductance, which are no longer so easy to determine. Both can be calculated very easily with Redexpert for different topologies at the working point of a SMPS. In this seminar, we will take a closer look at the causes and explain where these losses come from. Particularly with metal alloy inductors, there are very special physical effects that you should be aware of. This is also demonstrated by the live measurement at the end.