[CentOS] [OT] ups advice

Thu Apr 14 18:51:02 UTC 2011
John R Pierce <pierce at hogranch.com>

On 04/14/11 9:49 AM, Brunner, Brian T. wrote:
> UPS and Power Supplies are not all the same.
> If the UPS has a stepped voltage output (not smooth sine wave like the
> local public grid has) in large enough steps to mess up the power
> supply, you wind up with no UPS in effect.
> CLEARLY if there are enough steps to the stepped output of the UPS
> (which depends on the UPS brand/model), the PC power supply happily will
> see it as a sine wave input.  How many is "enough" depends on the power
> supply and the load.

switched PC/Server PSU's *so* don't give a bleep about sinusoidal power, 
its not funny.   first thing they do is full wave rectify the power to 
DC, then they run that DC through a high frequency (several 100Khz 
usually) oscillator and into a toroidal transformer.      they would be 
perfectly happy running off a full squarewave