Uninterruptible Power Supply: What It Is and How It Works
Compared with standby UPS and line-interactive UPS, it can solve almost all the unreliable problems in mains supply and offer backup power supply to the load without transfer
An uninterruptible power supply (UPS) is an electrical device that provides emergency power to connected equipment when the main power source (typically utility power) fails. It conditions incoming power to ensure clean and uninterrupted power, protects devices from power problems and enables seamless system shutdown during complete outages.
For large power units, dynamic uninterruptible power supplies (DUPS) are sometimes used. A synchronous motor/alternator is connected on the mains via a choke. Energy is stored in a flywheel. When the mains power fails, an eddy-current regulation maintains the power on the load as long as the flywheel's energy is not exhausted.
The input power source may fail aperiodically, resulting in communication outage and data loss. Moreover, problems like voltage spike, voltage sag, noise, harmonic distortion also affect the quality of mains power. To protect device security and ensure working efficiency, an uninterrupted power supply can be a credible assurance.
Apart from aforesaid three common UPS power supply designs, the following things are also needed to be considered during purchasing. Voltage Rating. UPS voltage rating is the maximum load designed to support, typically ranging from 300 VA to 5000 kVA. It's suggested to buy UPS with a voltage rating that is 1.2 times the total load needed.
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