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'HomeBrew UPS'
1999\08\04@002328 by glentorr

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Howdy All,
Anyone know of a published/available circuit for a UPS suitable for a PC with se
amless change over.
Cheers
Glen Torr

__________________________________________________________
Message sent by MyMail http://www.mymail.com.au/

1999\08\04@115922 by Harold Hallikainen

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       Years ago I did a product that had a standard off-line switcher.
The incoming AC (120VAC) went thru a full wave voltage doubler (resulting
in about +/- 170VDC with respect to neutral), then on to the switching
circuitry.  I battery backed this system with a DC to DC converter that
took 12 VDC and converted it to +/- 150 VDC.  This +/- 150 VDC was
connected across the power supply HV filter capacitors.  The output
diodes in the DC to DC converter prevented any current flow when the AC
line was present.
       The 12V battery was "almost" floating.  The negative side was
connected to the -12V output of the switcher.  The positive side was
driven with a 317 regulator from the +5V output of the switcher,
resulting in the battery floating at 14V.  Further, current to the DC to
DC converter was monitored.  Should it exceed 100mA, the 317 was shut
down so we didn't have the battery powering the DC to DC converter
driving the switching supply charging the battery.
       Overall, it worked pretty well!

Harold



Harold Hallikainen
spam_OUTharoldTakeThisOuTspamhallikainen.com
Hallikainen & Friends, Inc.
See the FCC Rules at http://hallikainen.com/FccRules and comments filed
in LPFM proceeding at http://hallikainen.com/lpfm

On Wed, 4 Aug 1999 04:00:07 "GMT" ".....glentorrKILLspamspam@spam@ozemail.com.au"
<glentorrspamKILLspamOZEMAIL.COM.AU> writes:
>Howdy All,
>Anyone know of a published/available circuit for a UPS suitable for a
>PC with seamless change over.
>Cheers
>Glen Torr
>
>__________________________________________________________
>Message sent by MyMail http://www.mymail.com.au/

___________________________________________________________________
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1999\08\04@120653 by Harrison Cooper

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OK....but I am in the same situation, but I need a commercial/industrial off
the shelf system that takes in 230 VAC and can run two NT boxes and a PLC

solutions??

1999\08\09@124457 by Sten Dahlgren

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".....glentorrKILLspamspam.....ozemail.com.au" wrote:
>
> Howdy All,
> Anyone know of a published/available circuit for a UPS suitable for a PC with
seamless change over.

It just happens that Microchip has a "reference design" of an UPS.
It's somwhere on there site.

regards
/Sten

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