23 Nov
2010
23 Nov
'10
7:28 p.m.
On 23 Nov 2010 at 18:35, Tony Duell wrote:
Yes, the inverter iotself runs at 10s of kHz. But it
gets it supply
from the normal 60Hz mains. I could well beleive that if the smoothing
of the input DC was not adequate, you could get a 60Hz component in
the output. I have certainly seen SMPSUs with mains (or twice mains)
frequency ripple on their outputs, due to input side smoothing
problems. Yes, the regulation loop should take care of it, but it may
not always do so. And I wonder how much regulation there is in the
inerter of a cheap CFL, or indeed the backplight of an LCD monitor.
I'm not convinced here--it would seem to me that excessive line-
frequency ripple would also introduce some artifacts into the
display. I see no evidence of that in the displays that I own.
--Chuck