Re: Battery Charger PFC

[Lee Hart <leeahart@earthlink.net>]

Mitchell Oates wrote:
>      I ended up getting two T650-26 toroids from Micrometals ($26
> each) to try and do some PFC on my big variac charger...

Mitch, the simplest answer is that you'll have to use trial and error to
size the inductors and decide where to put them. There are simply too
many variables for a simple one-size-fits-all solution.

Fundamentally, you want to put an inductor in series with one of the AC
input wires or AC output wires from the variac. If you also want to add
capacitors, they can go either directly across the AC line, or across
the AC after the inductor.

If you want, you can get a simple PSPICE circuit simulator to experiment
with values and see what waveforms it produces. However, inductors are
hard to simulate properly; the simulator will be close but not entirely
accurate.
-- 
Lee A. Hart                Ring the bells that still can ring
814 8th Ave. N.            Forget your perfect offering
Sartell, MN 56377 USA      There is a crack in everything
leeahart_at_earthlink.net  That's how the light gets in - Leonard Cohen