g wrote:
It is supposed to be uninterpretable, but in practice, low end UPSs, especially the ones sold for home or home offices, have a changeover time when AC fails. It is only a cycle of so, but it is there. They are not designed to be providing continuous AC. These units should properly be called a battery backup, and not a UPS, but you know how marketing is.On Wednesday 30 April 2008 01:00:32 pm Mikkel L. Ellertson wrote:It could be the time it take to switch between line power and battery. It tends to be more common with fully loaded power supplies. There is not enough reserve in the filter caps or something to carry over the loss of a cycle or two. A UPS that will also compensate for line voltage tends to have less of a problem with this because there isn't the abrupt changeover.this is incorrect. ups = uninterruptible power supply. dc to ac conversion is done with mains floating battery and ac conversion circuit draws power form battery. this is what maintains continuous ac output with out interruption.
I have worked with true UPSs, but most of those were 480 volt, 3 phase, with a room full of batteries...
Mikkel -- Do not meddle in the affairs of dragons, for thou art crunchy and taste good with Ketchup!
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