Uninterruptible power supplies (UPS) are used to guarantee the supply of electricity to critical loads if there is a power outage on the incoming grid.
Online UPS systems connect between the incoming grid and the electricity supply to the critical loads. The AC is first converted into a DC voltage using an AC-DC converter. The DC voltage is then used to convert back into an AC voltage using a DC-AC converter. The DC voltage is also used to power a back up battery. If there is a power outage, the battery provides power to the critical loads through the DC-DC and then the DC-AC converter. The advantage of this online approach is that power outages, spikes on the incoming grid and fluctuations in the incoming voltage and frequency are removed from the electricity supply to the critical loads.
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