A UPS (uninterruptible power supply) system is a device that provides emergency power to a load when the input power source, typically mains power, fails. A UPS system typically includes a battery, which provides power to the load during a power outage, as well as a charger that recharges the battery when mains power is present. Some UPS systems also include an inverter, which converts the stored DC power from the battery into usable AC power for the load.

UPS systems come in a variety of sizes, from small units designed to protect a single computer, to large units that can power entire data centers. The two main types of UPS systems are:

  • Offline/Standby UPS: This type of UPS uses the mains power as the primary power source, and the battery kicks in only when the mains power is lost.
  • Online UPS: This type of UPS constantly converts the mains power into DC power, which is then converted back into AC power and supplied to the load. The battery is always connected to the load and provides power during power outages.

UPS systems are commonly used in critical environments where power outages or fluctuations can cause damage to equipment or data loss, such as in data centers, medical facilities, and industrial plants.

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