Online UPS, usually called "double conversion", are identified with the abbreviation VFI (Voltage and Frequency Independent). This technology ensures that the UPS always generates an output power supply, perfectly sinusoidal, independent from the input one, clean and stable in both frequency and voltage. In this way, the UPS output is powered thanks to the rectifier that switches the UPS input voltage from alternating to direct and by the inverter which transforms the direct voltage back into alternating. UPSs with online technology are ideal for powering data centers, servers, healthcare equipment, industrial automation processes and transportation.
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