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UPS Basics. Everything you ever wanted to know about uninterruptible power systems but were afraid to ask.

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Figure

Figure 1. Internal design of a line-interactive UPS.
Figure 3. Internal design of a multi-mode UPS.
Figure 4. Three-phase power is generated and distributed to large commercial customers, with secondary  customers, like homeowners, only receiving single phase power
Figure 6. Serial (cascade) UPS architecture with changing power path if the UPS under load fails
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