Double Conversion (Uninterruptible Power Supply)

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Or On-line UPS system receives mains AC power, rectifies it into DC for conditioning and battery charging, then inverts it into clean AC to supply the critical load.

In the event of mains overvoltage or failure the UPS continues to supply the load from its battery with no transfer delay. Provided the mains power disturbance duration is less than the battery autonomy, the event remains invisible to the load.