[LinuxUsers] more Re: Sine wave vs shaped square wave

[Dante Lanznaster]

On Thu, Jun 4, 2009 at 7:23 AM, Todd Lyons <tlyons at ivenue.com> wrote:

> On Wed, Jun 3, 2009 at 6:34 PM, Jeff Lasman <jplists at nobaloney.net> wrote:
> > Good info here:
> >
> http://sci.tech-archive.net/Archive/sci.electronics.design/2005-02/5165.html
> > But that was 2005, this is 2009, and UPSes using stepped square waves
> > come with $10,000 equipment warranty.
> > So have things (like design issues) fundamentally changed?
>
> Everything modern uses high frequency switching power supplies (unless
> you're like Gibson and got a PDP-8 :-).  So when you talk about
> stepped square waves, are you talking about PWM (Pulse Width
> Modulated) output?  That's par for the course nowadays.
>

high frequency switching PSU's have been around for a while now. Also, it's
not PWM, it's sine wave approximation by phase switching/filtering, and the
closer it gets to a real sine wave on the output, in battery mode, the more
expensive the UPS.


>
> --
> Regards...      Todd
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