  This paper presents a first assessment of a design method aiming at the
minimization of the number of turns $N$ and the air gap length $g$ in
ferrite-core based low-frequency-current biased AC filter inductors. Several
design cases are carried on a specific model of Power Module (PM) core, made of
distinct ferrite materials and having different kinds of air gap arrangements
The correspondingly obtained design results are firstly compared with the
classic approach by linearization of the magnetic curve to calculate $N$ and
the use of a fringing factor to determine $g$. Next, a refined design approach
of specifying the inductance roll-off at the peak current and its potential
limitations are discussed with respect to our design method. Finally, the
behaviour of inductors operated beyond their design specifications is analyzed.
