Oliver Broad <oabdelphi@COAXIALPOWER.COM> wrote:
> Poor power factor on a PC comes from current distortion not lag or lead.
>
> That's why it can only be corrected by bulky filter networks or complex
> active correction.

Actually, it isn't all that complex any more. Several single-chip power
factor controllers exist, and I know of one that comes in an 8-pin DIP.
The only external components typically required are a high-voltage FET,
a coil and a few Rs and Cs.

It could be well worth becoming familiar with these devices, as many
markets (particularly in Europe) are requiring PFC in their EMC
regulations.

-- Dave Tweed

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