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