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Reducing winding loss in a ferrite inductor
Test bench results
Vin(V) Lin (A) Pin (W) Vo (V} Io {A) Po (W) Efficiency
1 gap 231 16.5 3811.5 390.7 8.8 3438.16 0.90
2 gaps 233 15.8 3681.4 391 8.79 3436.89 0.93
3 gaps 233 15.6 3634.8 391 8.78 3432.98 0.94
4 gaps 233 15.5 3611.5 391.5 8.8 3445.2 0.95
Ferrite
Copper
1gap
X
2
gaps
of
X/2
3
gaps
of
X/3
4
gaps
of
X/4
5
gaps
of
X/5
6
gaps
of
X/6
7
gaps
of
X\7
Gap
Optimized
gap
structure
can
increase
overall
efficiency
Fringing
flux
and
hence
winding
loss
can
be
reduced
by
increasing
the
number
of
gaps
and
making
each
gap
smaller
The
bench
tests
confirm
that
increasing
the
number
of
gaps
increases
the
efficiency
of
the
system
Increasing
from
1
to
2
gaps
gives
the
most
incremental
improvement
Air
gap
in
the
magnetic
path
is
necessary
to
increase
core
reluctance
Bench test results
