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 Post subject: Active v.s. Passive PFC?
PostPosted: Mon Jun 02, 2003 8:47 pm 
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Location: ontario.ca
Other then the efficiency differences and the saving on your hydro bill because of that, is there any other reason that you would want Active over Passive?


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PostPosted: Mon Jun 02, 2003 10:24 pm 
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Location: EU
It depends on how it's done.

Passive PFC (at least when done with charge pump) can increase the heat generation inside the PSU and decrease the PSU efficiency (compared to a APFC PSU). I'm not now talking about the utility company transmission efficiency of a PFC vs non-PFC supply, but the PSU efficiency of a passive PFC vs active PFC supply. A Higher PSU efficiency means less heat inside your case.

Then again APFC PSUs may increase harmonic emissions into the power line for short durations when compared to a passive PFC (done right).

I think for normal house hold PCs, not using electronic motors and not having EMI sensitive equipment around, Active PFC would be a better choice IMHO. Just based on efficiency and heat alone.

This is just my humbel opinion and I'm not an expert on the issue.

regards,
Halcyon

Ref:

http://www.compliance-club.com/archive1/991215.htm


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PostPosted: Tue Jun 03, 2003 8:12 am 
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ok cool. Thanks!


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