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.
--
David Woolley K2 06123
On 25/04/17 04:51, Jim Brown wrote:
The reason for using 240VAC is to reduce the IR drop in the AC line,
which, BTW, is not sinusoidal, but rather pulses that charge the filter
caps at the peaks of each cycle. So the drop in the wire is even greater
than Ohm's law appliced to a sine wave would predict.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
