Uninterruptible power supply (UPS)

A device that enables the supply of a stable output power without being affected at all by input power stoppages or voltage drops. Also known as a UPS (Uninterruptible Power Supply).

The most common method combines a storage battery with an AC-DC converter and a DC-AC converter. In this method, during normal operation, the input AC voltage is converted to DC voltage and partially float-charged to the battery, then converted back to AC voltage for the load. When a power outage or voltage drop occurs, the power supply switches to the battery to maintain output stability. There is also a method that does not use a battery, which stores electrical energy as kinetic energy using a combination of a flywheel, motor, and generator to prepare for power outages or voltage drops. Note that the power outage protection time of an uninterruptible power supply is only for brief interruptions or switching of the power supply, and does not support long-term outages like a solar power storage battery.