Richard Nute suggests there is a power limit to the effectiveness of a inductor
in meeting
the harmonic limits. If you are prepared to use multiple inductors and
capacitors in a low
pass filter configuration between the rectifier and the linear regulator there
is no theoretical
limit to how much you can suppress harmonics. The limit is the practicality of
the use
of such filters. You tend to need values of several henries capable of taking
the DC current
which may be 10's of amps without saturating. Such inductors are large.
Nick Rouse
