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Inverter 220Vcc to 220Vac

 
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SZASZ



Joined: 27 Apr 2007
Posts: 69
Location: TIMISOARA

PostPosted: Wed Mar 26, 2008 6:51 pm    Post subject: Inverter 220Vcc to 220Vac Reply with quote

Hi,

did everyone knows a schematic or a how to project an inverter that convert 220Vcc to 220Vac aprox 2500VA.

Tnx.
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Thu Mar 27, 2008 2:23 am    Post subject: Reply with quote

Question
what did you mean by 220Vcc? (Vcc is only used as a source indicator on schematics)
& if you meant a converter for 220Vdc to 220Vac, why would you need that as it does not sound practical?
"Mains" conversions are generally achieved by means of using lower DC potential such as a car battery with limited results.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Mon Mar 31, 2008 7:57 am    Post subject: Reply with quote

In some languages, in particular french, DC is written as CC (courant continu).

Many years ago, when DC mains supply was common in cities, there was a demand for such DC/AC converters. Those units were usually of relatively small power, some tens of watts. They were usually based on a electromechanical chopper but there were a few designs using vacuum tubes too.

A such converter is described in the an issue from around 1960 of the swedish "Radio & Television" magazine.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Tue Apr 01, 2008 2:48 pm    Post subject: Reply with quote

Here is a modern article dealing with this kind of inverters. http://www.en-genius.net/includes/files/grnpowt_120307.pdf
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SZASZ



Joined: 27 Apr 2007
Posts: 69
Location: TIMISOARA

PostPosted: Tue Apr 01, 2008 6:53 pm    Post subject: Reply with quote

Yes torbjorn in my country Vcc means VDc, sorry cause I have forgout to write. Very Happy
My collegue has an huge battery pack ( size of a room).
Batteries with chemycal reactions based with KOH or NaOH.
The electrolytic cellss are placed on a box that made of glass.
This batteries provide 220Vdc +,- 30V.
This power is trough an equipment (stabilizator, regulator) that provides 220Vdc +,- 5V.
I would like to help him to power two servers and one normal PC.
Sow is a poor inductive load.
The battery pack cannot be splited.

Sorry cause my englis is not so good. Embarassed
Tnx for the link, I would try to project.
If will work maybe some protection (overload short) must to be aded.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Sat Apr 05, 2008 8:07 pm    Post subject: Reply with quote

A normal computer power supply (switch mode power supply, SMPS) will work very well on DC.

But you should not try to power equipment with a conventional mains transformer (say, wall plug adapters etc) on DC. Those will not work and probably the transformer's primary winding will burn out within seconds.

Don't try supplying CRT monitors with DC. Although the monitor's main power supply will usually run well on DC, the degaussing coils will not do. So, if you have to supply a monitor with DC, you should first disconnect the degaussing circuitry (on simpler designs, it is just a 3-pin PTC resistor that has to be desoldered, on more expensive monitors there can be a more complicated circuitry with relays, timers etc, there it is best to refer to the service manual for the monitor).

Also, you should not try to supply laser printers with DC.
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SZASZ



Joined: 27 Apr 2007
Posts: 69
Location: TIMISOARA

PostPosted: Sat Apr 05, 2008 9:57 pm    Post subject: Reply with quote

Did you have tested a switch power suplly with Dc?
I would test monday a Atx power suplly.
If it will work the question is : IT will work 24 of 24 hours?

TNX.
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torbjorn



Joined: 07 Jun 2007
Posts: 370
Location: Sweden

PostPosted: Sun Apr 06, 2008 8:35 am    Post subject: Reply with quote

Yes, normally it will work very well.
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