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EEVblog #504 – UPS Tutorial & Teardown

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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