The IEC 555 standard (later superseded by IEC 61000-3-2) specifies
allowed harmonic distortion in the power supply current of electronic
equipment:
https://en.wikipedia.org/wiki/IEC_61000-3-2
I believe it is mandatory in Europe and some other countries but not the
United States:
http://www.metlabs.com/emc/emc-testing-requirement-for-it-equipment-varies-by-country/
Alan N1AL
On 04/26/2017 04:04 AM, David Woolley wrote:
I don't believe that it is legal to market a power supply that only
draws current on input peaks in either the USA or EU these days. Power
supplies are supposed to spread the current demand over a significant
part of the cycle. I believe this is done by having a relatively low
value capacitor on the mains side and relying on the switching regulator
to compensate for the wide voltage variations across each cycle. I
believe that even applies to wall warts.
This "power factor correction" will not be perfect, so the peak current
will still be more than for a resistive load.
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