what is ups | how ups works | multipletechnologies300.blogspot.com

What is UPS ?

What is UPS?
 The word UPS stands for uninterruptible power supply. This is a device which supply power to other devices, whenever the mains power fails for example. You are working on a project on your PC and suddenly the main power supply fails and you did not get the time to save your work and you lost all your hard work due to power failure. here the UPS comes to life and supply the power to your PC and provide you the time to save your hard work and shut down your PC safely.

How it works ?
Basically there is a battery,battery charger, controller unit,surge protector,voltage regulator,transformer etc installed in an UPS.
The power travels from the mains to the ups, and from the ups to the device. So whenever the mains power fails the battery installed in the UPS comes to life and power the device connected to it and supply the power until the mains power is back. when the mains power again starts to supply the power the ups takes the power directly from the mains and supply the power to the device and the battery goes on charging mode.

Types of UPS.

Commonly there are three types of UPS available in the market.

1. Offline UPS.

2. Line Interactive UPS.

3. Online UPS.

The UPS has an input terminal and an output terminal the input terminal connects to the mains and the output terminal is connects to the device which we want to power.

So now we'll understand how the three different types of ups works.

offline UPS diagram

Offline ups.
In an offline ups the power from the mains travel to the ups the ups supply the power directly to the output terminal as well as to the battery charger which starts to charge the battery, so whenever the power from the mains fails the ups switches to the battery and starts to supply the power to the output terminal and the connected device starts to get power from the battery instead of mains power. If the mains outlet starts to supply the power to the ups, the ups switches back to the mains power and starts to charge the battery again for future use.
It is called an offline ups because the battery stops to supply the power once the mains power is back and goes in offline mode (charging).

Line interactive  UPS diagram

Line interactive UPS
The line interactive ups works same as an offline ups but a little differently. The line interactive ups interacts with the mains power and controls the output voltage.
 Eg: If the mains power is supplying  220v AC and suddenly it drops to 110v AC, it will boost the voltage to 220v AC and if the mains voltage cross 220v AC limit then it brings the voltage again back to 220v AC. So basically it interacts with the mains input voltage before switching to battery as compared to Offline UPS.

Online UPS diagram

Online UPS.
The online ups is the most stable type of ups for sensitive devices because the online ups stays online. which means the battery is connected to the output terminal of the ups forever.
Eg: the power from the mains travels from the mains outlet to the ups battery charger the charger steps down the voltage from 220v AC to 12v Dc then the power is supplied to the battery and from the battery the 12v DC is step up to 220v AC and supplied to the  output terminal so whenever the power fails from the mains the power is supplied constantly to the output terminal without switching effect and no delay occurs because there is no switching. so it is used in very sensitive devices which turns off if a power failure occurs in a nano sec delay.