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What is Online UPS?

In industrial electronics, an Online UPS (Uninterruptible Power Supply) is a type of power protection system designed to provide a continuous and stable power supply to critical equipment and processes. Unlike other UPS types, such as line-interactive or offline UPS, an online UPS constantly regulates the incoming power and ensures that the connected devices receive a consistent and reliable power source at all times.

Block Diagram of Online UPS

Working Principle of Online UPS

When the main supply is present, the rectifier or charger provides power to an inverter as well as battery. The battery is charged. The inverter is ON and feeds power to the load through UPS static switch.
The UPS static switch is always ON and connect load to the inverter output.
The main static switch is always off. But when the UPS fails to feed the power, then the load is connected directly to the mains through the main static switch.
When the main supply is not available, then the battery bank supplies power to an inverter. Thus, an inverter is always ON and it takes the power from rectifier or battery.

Specifications of Online UPS

Power Rating: 500 VA to 50kVA.
Output Voltage: 230V, 0.1%.
Backup time: 30 min to 4 hr.
Power Factor: More than 0.8 (Lagging).
Efficiency: Greater than 85%
Input Voltage: 230V, 15%.
Output Frequency: 50 Hz
Harmonic Distortion: Less then 3%

Advantages of Online UPS

It provides isolation between main supply and load.
Voltage regulation is better.
Transfer time is practically zero.

Disadvantages of Online UPS

It is very costlier than others.
Overall efficiency is not good.

Applications of Online UPS

Used is induction motor drives.
Also used in medical equipment etc.

Conclusion

The online UPS is an essential option for maintaining an uninterrupted power supply and safeguarding crucial equipment in numerous industries. Employing an online UPS, like those on PolynotesHub, will surely prove to be a prudent and forward-thinking choice for businesses trying to improve operational efficiency and protect their investments. In this blog, PolynotesHub shares with all of you, a small discussion of Online UPS.

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