Designing high frequency AC inductors using ferrite and molypermalloy powder cores (MPP)

This paper sets down the major considerations in the design of high frequency AC inductors. It describes two methods for designing the inductor— the area product method and the core geometry method. The two major effects of the inductor air gap, fringing flux power loss and increase of inductance, are discussed. Equations for the inductor design and a step-by-step design procedure are given. The use of a lumped air gap or a distributed air gap are discussed and a comparison of the losses resulting from these gaps together with experimental results are presented.