[TechAssist] Re: use a battery backup UPS for TV,DVD,surround amp system protection ?

From: "J Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Date: Fri, 7 May 2004 15:21:03 -0400
The square wave is already coming out of a transformer. Its not a perfect
square wave. If you run it through another transformer it will still look
something like a square wave. Some of the high frequency components will go
into heating the transformer. Another problem is with that RMS value. For a
square wave the RMS is equal to the peak voltage. For a sine wave the RMS is
equal to 0.707 peak voltage. When some one designs a power supply for
something, they do so with a specific waveform and peak voltage in mind. The
RMS value is mostly of interest for heater loads.
Jerry Silverman
Greentron Inc
4 Newland Ave
Greenville SC 29609
864 232 3889
Fax 271 2080
mailto:greentron@xxxxxxx
----- Original Message -----
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 07, 2004 2:13 PM
Subject: [TechAssist] Re: use a battery backup UPS for TV,DVD,surround amp
system protection ?


> What about adding a 1:1 isolation transformer to turn the square wave into
a
> sine wave?
>
> Peter Oliver
> Tucson Radio TV
>
>
> From: "J Silverman" <greentron@xxxxxxx>
> Reply-To: techassist@xxxxxxxxxxxxx
> To: <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Re: use a battery backup UPS for TV,DVD,surround amp
> system protection ?
> Date: Fri, 7 May 2004 13:12:42 -0400
>
> The computer power supplies work fine with the 115 VAC (RMS) square wave
> output from the low cost UPSs. Most consumer electronic equipment is rated
> for 115 volt RMS 60 Hertz sine wave, plus or minus 10%. If you use the
> computer UPS with consumer electronic equipment the internal voltages and
> losses are different than the spec., so you are not sure if you will have
> functional problems or if things will overheat. A lot of stuff will
probably
> work OK, but you cant be sure. So the suggestion was made to use UPSs that
> have a sine wave output and these are many times more expensive than the
> ones with a square wave output.
>
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> 864 232 3889
> Fax 271 2080
> mailto:greentron@xxxxxxx
> ----- Original Message -----
> From: "Kevin" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, May 07, 2004 5:30 AM
> Subject: [TechAssist] Re: use a battery backup UPS for TV,DVD,surround amp
> system protection ?
>
>
>  > Using a UPS for a computer is also designed to save what a person is
>  > working on at the time of a power outage.  When the power goes out the
>  > computer stays on and the person can save his work and then shut the
>  > computer down properly.  In some cases it will also prevent data from
>  > being corrupted on the hard drive when the power goes out.  Having the
>  > power outage causes windows to shut down improperly, which could
corrupt
>  > data on the hard drive.
>  >
>  > Kevin Wilks
>  > Kevin's TV & Video Repair
>  > Penticton BC Canada
>  > kevintv@xxxxxxx
>  >
>  >
>  > -----Original Message-----
>  > From: techassist-bounce@xxxxxxxxxxxxx
>  > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Hoyt's TV
>  > Sent: Friday, April 30, 2004 2:11 PM
>  > To: techassist@xxxxxxxxxxxxx
>  > Subject: [TechAssist] Re: use a battery backup UPS for TV,DVD,surround
>  > amp system protection ?
>  >
>  > Considering the price of some TVs and stereos these days, I'm surprised
>  > they
>  > don't push UPS's for those, like they do for computers. Computers were
>  > the
>  > first things that were overly sensitive but TVs etc. have now caught
up.
>  >
>  >
>  > Russ Hoyt
>  > Hoyt's TV
>  > Exeter, NH
>  >
>  >
>  > ----- Original Message -----
>  > From: "Larry Poffen" <lpoffen@xxxxxxx>
>  > To: <techassist@xxxxxxxxxxxxx>
>  > Sent: Friday, April 30, 2004 3:46 PM
>  > Subject: [TechAssist] Re: use a battery backup UPS for TV,DVD,surround
>  > amp
>  > system protection ?
>  >
>  >
>  > > I have used a APC 1000 for my personal stuff for about 2 years.  I
had
>  > a
>  > > power surge that took it out this year, along with many other things,
>  > but
>  > my
>  > > 36" TV  &VCR/  stereo stuff were all OK.  It is worth the peace of
>  > mind.
>  > > Larry
>  > >
>  > > Larrys TV Service
>  > > Broken Arrow OK 74011
>  > > phone 918-455-1041
>  > > Fax 918-451-4485
>  > > e-mail lpoffen@xxxxxxx
>  > > ----- Original Message -----
>  > > From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
>  > > To: <techassist@xxxxxxxxxxxxx>
>  > > Sent: Friday, April 30, 2004 9:06 AM
>  > > Subject: [TechAssist] use a battery backup UPS for TV,DVD,surround
amp
>  > > system protection ?
>  > >
>  > >
>  > > > I never heard of anyone doing this, but I've had this thought for a
>  > few
>  > > > years:
>  > > > use a heavy battery back up UPS like used on PC systems for an
>  > > > entertainment center. Many ills are from power
>  > > > fluctuations,sags,surges,etc. TV EEPROMs corrupted, power supplies
>  > > > damaged, pro-jo CRTs damaged with  a spot because it went down at
>  > once
>  > > > without proper power down,etc.
>  > > > Most equipement is not a heavy current draw.
>  > > > Can this be done and should it?
>  > > > I have a Zenith 50" projection TV (not wide screen,standard 3:4)
>  > which
>  > > > is rated at 215 watts (2.8A) "max".
>  > > >  I think my VCR/DVD deck pulls maybe 30 watts.
>  > > > My Bose "lifestyle 7" surround amp, I don't know the wattage.
>  > > > And a cable box maybe another 30 watts?
>  > > > I'm guessing 300-400 watts max running everything
>  > > >  if using the sound system as well. Much less if using only the
>  > projo's
>  > > > speakers.
>  > > > Now most of these UPS units are in standby mode and  the connected
>  > gear
>  > > > is running off line current until there is a power loss, which time
>  > > > ultra-fast switching transferrs power to the battery system. This
>  > would
>  > > > be only needed for intermittant power fluctuations, or if lost
>  > totally,
>  > > > enough time to safely power off the audio/video system.
>  > > > A 6 outlet power strip plugged into the UPS would be convenient.
>  > > > What would be a good power rating for a UPS?
>  > > > Twice needed wattage? whats rule of thumb, and also whats your
>  > feedback
>  > > > on this idea?
>  > > > Phil Bader
>  > > >
>  > > > --
>  > > >
>  > > > Philip Bader
>  > > > Jan Phyl TV Inc. (estab. 1976)
>  > > > 3420 Recker Hwy. Winter Haven, Fl. 33880
>  > > > Fax (863) 299-8821
>  > > > email: tjanphyl@xxxxxxxxxxxxxxx
>  > > >
>  > > >
>  > > >
>  > >
>  > >
>
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References:
- [TechAssist] Re: use a battery backup UPS for TV,DVD,surround amp systemprotection ?
  - From: Peter oliver
[TechAssist] Re: use a battery backup UPS for TV,DVD,surround amp system protection ?

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