EDN Magazine — 09.14.95 Paranoid about data loss? Choose your UPS carefully(figure)

FIGURE 2

Fig 2— The on-line UPS without bypass provides no redundancy in case of a UPS failure (a). The topology in (b) is a variation of the standard standby UPS. A standby-ferro type (c) provides a clean, well-filtered output waveform. In the line-interactive UPS (d), the dc/ac inverter switches directions upon a power failure.

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