Uninterruptible Power Supply (UPS)

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

The most common method combines a storage battery, an AC-DC converter, and a DC-AC converter. In this method, under normal conditions, the input AC voltage is converted to DC voltage, with a portion used to float-charge the storage battery, and then converted back to AC voltage to supply the load. In the event of a power outage or voltage drop, the system switches to power supplied from the storage battery to maintain stable output. As an alternative that does not use storage batteries, there is a method that combines a flywheel, motor, and generator to store electrical energy as kinetic energy in preparation for power outages or voltage drops. The backup time of an uninterruptible power supply is limited to short durations such as momentary outages or power switching, and it does not support long-term power outages like storage batteries for solar power generation.