Dave explains the three main methods of Uninterruptible Power Supply design - Offline, Online, and Line Interactive. And then opens an APC 2200XL rack mount UPS to see how well it matches the classic block diagram theory. Will there be any surprises?
Schematic: http://eevblog.com/files/apc_smart-ups_su2200_3000.pdf
Patent: Method and apparatus for providing battery charging in a backup power system
http://www.google.com/patents/US5302858
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