There is the wiki on it, but even that does not explain it properly. If you have a look at this;
http://www.pcrite.com/store/product_info.php?cPath=24&products_id=360 which is typical of what you find in a computer store, you will find a single, underrated inductor inside. During normal use, the PC is powered directly, and the the battery is kept topped up by one winding. When the mains fails, relays kick in, and inverter runs, using the same power inductor, but other windings. Usually only for a few min otherwise the inductor would overheat(been there). When mains restores, it takes up to 8 hours to recharge the battery. They really are designed for an unlikely power outage. But...... I'm not sure what power rating you are thinking of, or what country you are in. When I say 'most', I mean the units you find here; http://www.walmart.be/english/products/oneCategoryProducts.asp?cat=48&catName=UPS which are usually chinese made. 2008/11/29 Rafael Skodlar <[EMAIL PROTECTED]> > Roland Jollivet wrote: > > Not quite. Most UPS's around 2KVA and below are 'off-line', ie straight > > feed-through. Far far cheaper to make. You pay through your ears for an > > on-line UPS as it requires a full power down and up converter. > > > > Every UPS has a full power down and up converter. How else would it > work? The difference between small and large industrial ones is in their > ability to switch from a UPS mode to feed-through without disrupting the > power to the load. Electronics takers care of the sync between primary > and secondary AC lines. That way you can work on UPS while the load has > full power. > > Repaired few small UPS' myself and managed a large one in a computer > center few years ago. Still have to large 100Ah batteries from one time > we replaced 36 of them. > > > Regards > > Roland > > -- > Rafael > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's > challenge > Build the coolest Linux based applications with Moblin SDK & win great > prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
