Optimisation of high frequency inductor design of series resonant converter

An analytical solution for the eddy current losses in a high frequency power inductor is obtained in a generalized way for single and multistrand conductors. The design optimization for toroidal inductors, using stranded conductors on a low permeability core, is then undertaken. Core loss and DC and AC copper losses are taken into account. The goal is to minimize weight and cost for known thermal conditions. Alternatively, the incremental weight loss characteristics generated provide additional design information for space use when total system weight is critical. The calculated figures of 60 g of additional inductor weight per watt of loss saved can be used as part of an overall system optimization procedure.<>