UPS

Why UPS?
If you have the following problem of Over voltage, Under voltage, Surge, Over shoot, Noise, Sags, Short interruption and Blackout I suggest that the most effective way to help you protect your computer is to use UPS.
An uninterruptible power supply (UPS), also known as a battery back-up, provides emergency power and, depending on the topology, line regulation as well to connected equipment by supplying power from a separate source when utility power is not available. It differs from an auxiliary or emergency power system or standby generator, which does not provide instant protection from a momentary power interruption. A UPS, however, can be used to provide uninterrupted power to equipment, typically for 5–15 minutes until an auxiliary power supply can be turned on, utility power restored, or equipment safely shut down.UPS is typically used to protect computers, data centers, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption or data loss.


Type Of UPS
1.The Standby UPS
The Standby UPS is the most common type used for Personal Computers.When the primary source fail the transfer switch must operate to switch to the backup power.source. The inverter only starts when the power fails, hence the name "Standby." High efficiency, small size, and low cost are the main benefits of this design. With proper filter and surge circuitry, these systems can also provide adequate noise filtration and surge suppression.
2.The Line Interactive UPS
The Line Interactive UPS is the most common design used for small business, Web,
and departmental servers. When the input power fails, the transfer switch opens and the power flows from the battery to the UPS output. This design provides additional filtering and yields reduced switching transients when compared with the Standby UPS topology. The Line Interactive design usually incorporates a tap-changing transformer.
3.The Standby-Ferro UPS
The Standby-Ferro UPS was once the dominant form of UPS in the 3-15kVA range. This design depends on a special saturating transformer that has three windings (power connections). In the case of a power failure, the transfer switch is opened, and the inverter picks up the output load. Even though it is a standby UPS by design, the Standby-Ferro generates a great deal of heat because the Ferro-resonant transformer is inherently inefficient. These transformers are also large relative to regular isolation transformers; so standby-Ferro UPS are generally quite large and heavy.
4.The Double Conversion On-Line UPS
This is the most common type of UPS above 10kVA.In this design both the battery charger and the inverter convert the entire load power flow , resulting in reduced efficiency with its associated increased heat generation. This UPS provides nearly ideal electrical output performance. But the constant wear on the power components reduces reliability over other designs and the energy consumed by the electrical power inefficiency is a significant part of the life-cycle cost of the UPS. Also, the input power drawn by the large battery charger is often non-linear and can interfere with building power wiring or cause problems with standby generators.
5.The Delta Conversion On-Line UPS
This UPS design is a newer, 10 year old technology introduced to eliminate the drawbacks of the Double Conversion On-Line design and is available in sizes ranging from 5kVA to 1.6MW. Under conditions of AC failure or disturbances, this design exhibits behavior identical to the Double Conversion On-Line. Delta Conversion technology saves energy by carrying the package only the difference (delta) between the starting and ending points. The Double Conversion On-Line UPS converts the power to the battery and back again whereas the Delta Converter moves components of the power from input to the output.