12V DC to rectified mains

C

CWatters

Guest
Years ago you could buy an "inverter" that converted 12V to "rectified mains
voltage" (eg the output was HV DC). It was intended to power computers and
other devices that contain switch mode power supplies because these
typically convert the mains to DC anyway.

The advantage was they were cheaper than modified sine or pure sine output
types and produce less noise, the disadvantage was they could only be used
on equipment that contained a switch mode power supply (no light bulbs).

Anyone know of a source in Europe for such a beast around 150-300W?

Colin
 
On Tue, 30 Mar 2004 22:03:05 GMT CWatters <colin.watters@pandorabox.be> wrote:

| Years ago you could buy an "inverter" that converted 12V to "rectified mains
| voltage" (eg the output was HV DC). It was intended to power computers and
| other devices that contain switch mode power supplies because these
| typically convert the mains to DC anyway.
|
| The advantage was they were cheaper than modified sine or pure sine output
| types and produce less noise, the disadvantage was they could only be used
| on equipment that contained a switch mode power supply (no light bulbs).

So light bulbs don't work on DC?

--
-----------------------------------------------------------------------------
| Phil Howard KA9WGN | http://linuxhomepage.com/ http://ham.org/ |
| (first name) at ipal.net | http://phil.ipal.org/ http://ka9wgn.ham.org/ |
-----------------------------------------------------------------------------
 
I believe that the type of units you are indicating are not made anymore,
and if so, they may be older inventory, or custom ordered. The reason is
that there were people who bought these, and did damage to their equipment,
that was speced for AC only.

The cost of the AC output type have dropped so much in price, that it is
more practical to have this type. There will be no danger of what type of
device you connect to it.

By-the-way, light bulbs are AC and DC. Transformers and other types of
mains operated devices that are reactive in nature, are the types of devices
that require the proper type of AC voltage to run on. Many of these are
critical to the AC frequency, and distortion factors of the sinewave. The
modern inverters comply to the necessary specifications to be safe, as to
the specifications indicated in their instruction booklets or paperwork that
comes with them.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"CWatters" <colin.watters@pandoraBOX.be> wrote in message
news:t8mac.55961$Wc4.3489891@phobos.telenet-ops.be...
Years ago you could buy an "inverter" that converted 12V to "rectified mains
voltage" (eg the output was HV DC). It was intended to power computers and
other devices that contain switch mode power supplies because these
typically convert the mains to DC anyway.

The advantage was they were cheaper than modified sine or pure sine output
types and produce less noise, the disadvantage was they could only be used
on equipment that contained a switch mode power supply (no light bulbs).

Anyone know of a source in Europe for such a beast around 150-300W?

Colin
 
<phil-news-nospam@ipal.net> wrote in message
news:c4eu2e03uu@enews1.newsguy.com...

So light bulbs don't work on DC?
Click to expand...
Yes but a mains light bulb almost certainly won't work on rectified mains,
where as a switch mode power supply will.
 
On Thu, 01 Apr 2004 10:13:23 GMT, "CWatters"
<colin.watters@pandoraBOX.be> wrote:

phil-news-nospam@ipal.net> wrote in message
news:c4eu2e03uu@enews1.newsguy.com...

So light bulbs don't work on DC?

Yes but a mains light bulb almost certainly won't work on rectified mains,
where as a switch mode power supply will.
Click to expand...
---
I used to work night shift, and in order to be able to sleep
comfortably during the day what I used to do was to connect the lamp
in my bedroom to DC, but connect it with the polarity backwards so
instead of making light it made dark. Also, I didn't have to use the
air conditioner since it made the room nice and cool.

--
John Fields
 
"John Fields" <jfields@austininstruments.com> wrote in message
news:40767728.786854625@news.texas.net...
On Thu, 01 Apr 2004 10:13:23 GMT, "CWatters"
colin.watters@pandoraBOX.be> wrote:


phil-news-nospam@ipal.net> wrote in message
news:c4eu2e03uu@enews1.newsguy.com...

So light bulbs don't work on DC?

Yes but a mains light bulb almost certainly won't work on rectified
mains,
where as a switch mode power supply will.

---
I used to work night shift, and in order to be able to sleep
comfortably during the day what I used to do was to connect the lamp
in my bedroom to DC, but connect it with the polarity backwards so
instead of making light it made dark. Also, I didn't have to use the
air conditioner since it made the room nice and cool.

--
John Fields
Click to expand...
Why can't you just use one of those 'black light' bulbs so you can have it
on at night without disturbing you? I found too that you can make these
cheaply yourself by recycling old 'normal' light bulbs. What the
manufacturers don't tell you is that they don't actually 'blow' as people
always thought - they just turn into 'black light' producers.

Ken
 
<phil-news-nospam@ipal.net> wrote in message
news:c4hmt801sef@news1.newsguy.com...
On Thu, 01 Apr 2004 10:13:23 GMT CWatters <colin.watters@pandorabox.be
wrote:
|
| <phil-news-nospam@ipal.net> wrote in message
| news:c4eu2e03uu@enews1.newsguy.com...
|
|> So light bulbs don't work on DC?
|
| Yes but a mains light bulb almost certainly won't work on rectified
mains,
| where as a switch mode power supply will.

I can believe that of flourescent lights. But a plain incandescent bulb
should work fine as long as the voltage is correct. If you full wave
rectify 120 volts AC to 120 volts DC, the total RMS voltage is still there
and the bulb being nearly a pure resistive circuit won't care.
Click to expand...
Oh I see now. I assumed they had output capacitors to produce rectified and
smoothed DC not just rectified AC. (That would mean about 300V DC from the
220V AC mains in Europe) but I guess they don't need output caps as there
are caps in the switch mode power supply that they are intended to drive.
 
"Ken Taylor" <ken123@xtra.co.nz> wrote in
news:c4hv5v$2fkd15$1@ID-76636.news.uni-berlin.de:

"John Fields" <jfields@austininstruments.com> wrote in message
news:40767728.786854625@news.texas.net...
On Thu, 01 Apr 2004 10:13:23 GMT, "CWatters"
colin.watters@pandoraBOX.be> wrote:


phil-news-nospam@ipal.net> wrote in message
news:c4eu2e03uu@enews1.newsguy.com...

So light bulbs don't work on DC?

Yes but a mains light bulb almost certainly won't work on
rectified
mains,
where as a switch mode power supply will.

---
I used to work night shift, and in order to be able to sleep
comfortably during the day what I used to do was to connect the
lamp in my bedroom to DC, but connect it with the polarity
backwards so instead of making light it made dark. Also, I
didn't have to use the air conditioner since it made the room
nice and cool.

--
John Fields

Why can't you just use one of those 'black light' bulbs so you
can have it on at night without disturbing you? I found too that
you can make these cheaply yourself by recycling old 'normal'
light bulbs. What the manufacturers don't tell you is that they
don't actually 'blow' as people always thought - they just turn
into 'black light' producers.

Ken
Click to expand...
! GROAN ! Hey, just get a pair of cat eyes like I have.

Nevil
 
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