What Is A True Online UPS?

What is a true online UPS - Prostar UPS

Under normal operation, a true online UPS runs continually on the battery via the inverter, while the line power runs the battery charger. In some cases, this type of UPS is called a double conversion, or double conversion online.

For a true online UPS, no transfer time occurs upon loss of utility power. The system provides power-factor correction and frequency regulation, in addition to surge suppression and power filtering.

In rare occurrences, the inverter fails. In that case, the UPS will switch to power provided directly from utility power via the UPS power filter/surge suppressor.

Converting all the power from AC to direct current (DC) and back to AC lowers efficiency and raises heat output. One method to reduce this inefficiency is to replace the battery charger with a delta-conversion online UPS. Instead of providing all the output from the battery under normal circumstances, some of it goes directly from the delta-converter from the input line power. In the event of a power failure, the unit operates like a regular true online UPS.

Typical applications include large servers, data centers and large sensitive equipment, and the typical size ranges from 5-5,000 kVA. The advantages of true online UPS include:

• Greater reliability because of redundant system components and pathways

• Higher power quality because power output is isolated from power input. The unit also provides power-factor correction and frequency regulation.

• Compact physical size, compared to line-interactive systems.

What is a true online UPS



Post time: Sep-25-2017