UPSs

[Pearson Shane]

Hi Stan,

A simple low pass filter made of 2 large inductors and a
few high voltage capacitors will do the trick nicely.
Which is not a slow reacting device being passive.
Combine this with polyswitch style protection and some method
of discharging a really high voltage to ground and it'll be
even better.

A very cheap design that should be in all UPS's.
And is certainly a whole lot better than nothing at all
for removing harzardous spikes, etc.


> -----Original Message-----
> From:	StanSquncr [SMTP:StanSquncr at aol.com]
> Sent:	Thursday, March 19, 1998 4:59 PM
> To:	spectre at anthrax.net; cypherpunks at toad.com
> Subject:	Re: UPSs
> 
> In a message dated 98-03-18 23:54:33 EST, spectre at anthrax.net writes:
> 
> << ... Any decent ups will put the incoming power
>  through a "conditioner" that will filter out noise in the incoming
> power,
>  and rebuild the wave so that transient sags and spikes don't get
> through. ...
> >>
> 
> BUT, even the fastest electronics cannot respond fast enough to the
> initial
> spike, if that spike is too high in the first place (if your incoming
> power
> lines get hit by lightning, for instance), it's already too late.  My
> suggestion, don't trust a UPS to eliminate spikes, get it if you
> anticipate a
> need for back-up power to shut down your system in case of black-out
> (and
> screw the surge protectors, trust the filtering in your power supply
> to do
> that for you.)
> 
> Stan