AEM

Products & Services > Uninterruptible Power System (UPS) > Online UPS

An uninterruptible power supply (UPS), also known as a battery back-up, provides emergency power and, depending on the topology, supplying power from a separate source when utility power is not available. A UPS, however, can be used to provide uninterrupted power to IT equipment, typically from minutes to hours until an auxiliary power supply can be turned on or utility power is restored.

There are three distinct types of UPS
›› Online UPS
›› Line Interactive UPS
›› Offline UPS

Online UPS

This is the most common type of UPS above 10kVA. In the Double Conversion On-Line design, failure of the input AC does not cause activation of the transfer switch, because the input AC is charging the backup battery source which provides power to the output inverter. Therefore, during an input AC power failure, on-line operation results in no transfer time.

Advantages of online topology

Zero Transfer Time
Can operate less often from battery when input voltage is highly distorted or wildly fluctuating
Power factor correction (PFC) provided, regardless of load type
Can be more compact and lightweight, especially at higher power levels