Uninterruptible power supplies power maintain continuity in power supply with the help of a battery backup in the event of power failures.
Need for UPS
There are many present a day appliances like
computers require continuous power supply. Even a small temporary failure in power supply to these appliances may cause a great deal of public inconvenience.
computers require continuous power supply. Even a small temporary failure in power supply to these appliances may cause a great deal of public inconvenience.
The examples such appliances which require continuity in power supply are; safety monitors, computers, communication systems, hospital intensive care units etc.
Early UPS systems are of rotary type which consists of combination of a DC motor driven alternator run with the help of battery and a diesel engine. However such a system is in efficient, uneconomical and bulky one.
Static UPS systems
The static UPS systems are presently common and are widely used. These don’t have any moving parts and are made with solid state power electronic switches. These are of two types; namely short break and no break UPS systems.
Short break UPS
The short break UPS will have small interruption time of about 4 to 5 ms. The block diagram of such a device is shown in below figure. Under normal conditions the load is directly connected to the supply line. On the instance of power failure the UPS switches to the battery with the help of static switch. A momentary interruption in supply can be observed in case of lamps and florescent tubes.
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| Short Break UPS |
No break UPS
The block diagram of a no break UPS is shown below. In such an uninterrupted power supply there not be any discontinuity in supply is noticed.
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| No break UPS |
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