Why are you particularly worried abuot the power factor?
Some simulations a colleague did some years back suggests that in fact, the
choke shouldn't be resonant, but very close to it, such that the choke looks
like a very much bigger inductance rather than a straight resistance at the
ripple frequency. This is done for minimum load, as the choke inductance will
decrease somewhat as the load increases. That's how I very succesfully use
tuned choke input: in addition, I filter in the negative lead, so you don't
need to worry about the case to innards insulation n the capacitor when it's
reasonable size metal cased oil cap. Incidentally, the chokes were always
obtained by a process f scrounging - I've never bought one yet! That includes a
massive 10H 1 Amp one set aside for a project....
I believe Tom, W8JI, has some hair raising tales about his first attempts at
resonant choke input supplies....
73
Peter G3RZP
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