I'm just reviewing a 120W psu spec. In the EU this would require power factor correction for the input. The spec I have doesn't mention it but does refer to MIL-STD-461.
I've had a quick search of the pdf for 461F doesn't mention power factor correction. So does the US care about PFC on power supplies? Or is it known by another name?
Google found this:
Don't think its what your looking for.
don
This might be useful:
Is it a military PSU? If they're quoting MIL STD 461 for EMC, it probably is. The relevant document for electrical supply quality is then MIL STD
704(F?) by association. It says there is no need for power factor correction below 500watts. The only noteworthy comment is that you can't use half-wave rectification. Don't laugh, I know someone who did.Graham H
Asian military.
And thanks that's the answer I needed. I'll find MIL-STD-704 for reference.
"Raving Nut Case"
** Total bollocks.There are restrictions that apply but having a PF = 1 is NOT one of them.
..... Phil
Nope. There are some constraints upon the power factor, but they're so lax that you would have trouble violating them if you tried.
That pretty well says what is what, in the US, for regulation, however there are some limits for meeting the "energy star" compliance here. I have also seen industrial loads where the utility required active power factor / harmonic correction. Otherwise, there are requirements that are part of equipment purchases and some manufacturer's associations that are putting out voluntary compliance standards.
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