Describe working of online UPS. List any two applications of UPS.

Describe working of online UPS. List any two applications of UPS.
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1 Answer

Answer :

Online UPS:

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The block diagram of the on line UPS systems is as shown, where the load is connected to the invertor through the UPS static switch. The UPS static switch is normally ON switch. It turns off only when the UPS system fails. In that case the mains static off switch is used only when UPS is to be bypassed. The various operating modes are


Mode 1:-When the AC mains is on, the inverter circuit will supply the power to the inverter as well as to the battery. Therefore it acts as a rectifier cum charger .Hence its ratings are usually higher. The inverter o/p is connected to the load via UPS static switch. Battery will be charged in this mode. 

Mode 2:-If the supply fails suddenly, the rectifier o/p will be zero and hence the battery bank now supplies power to the inverter without any interruption and delay. There will not be any inverter as well as the load. After restoration of the line supply,the charger supplies the inverter and recharges the battery automatically first in constant current mode and then in constant potential mode. 

Mode 3:-In case if the inverter /UPS fails, then the normally OFF mains static switch is turned on which automatically transfers the ac line to the load in less than ¼ th of the cycle period with no phase discontinuity.

Applications of UPS:

1) Data Centers

2) Banks and insurance

3) Industrials

4) Healthcare: hospitals, clinics and retirement homes

5) Telecommunications

6) Special projects (events)

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