[LinuxUsers] Sine wave vs shaped square wave

[Jeff Lasman]

On Wednesday 03 June 2009 07:29 pm, Gregg Rawson wrote:

> There is an additional feature on some online UPS's where there is
> buck/boost circuitry. If there is a brown out, and it is just above
> the cutoff voltage, the equipment will keep running on the low
> voltage on a normal UPS. With the buck/boost feature, the voltage
> will be brought up or down to a normal level as required.

Online UPSes are what we have at the data center.  This discussion has 
been about my office, where I cannot afford online UPSes.  I wish I 
could.

My Smart-UPS units are all almost ten years old and have been 
refurbished at least once (two of them twice).  It may just be time to 
move away from them; replacing batteries and refurbishing them costs as 
much or more than the cost of new Back-UPS series UPSes, which are 
stepped square wave, but if one reads that link at the bottom of my 
last post to this thread ... that's not a problem.

Jeff
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