Uninterruptible Power Supply (UPS)

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Presentation transcript:

Uninterruptible Power Supply (UPS)

Introduction An Uninterruptible Power Supply, also Uninterruptible Power Source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically the utility mains, fails.

UPS

Block diagram of UPS

Standby UPS diagram

Types of UPS Offline UPS Online UPS Line interactive UPS There are three types of UPS are available. They are Offline UPS Online UPS Line interactive UPS

Offline UPS The mains to battery changeover time or battery to mains changeover time in offline UPS is very low as compared to inverter. Typically, changeover time in inverters is 500 milliseconds & Offline UPS has changeover time of 3-8 milliseconds.

Block diagram of Offline UPS

Offline UPS In a time, when mains ac is present, Inverter provides the output as is the input mains. While, Offline UPS has built in Automatic Voltage Regulator (AVR) to regulate the output voltage close to 220V ac. Offline UPSs are normal weight UPSs and are widely used for domestic computers.

Offline UPS circuit

Line Interactive UPS In this design, the battery to AC power converter (inverter) is always connected to the o/p of the UPS. Battery charging is done during times when the I/P AC power is normal when the I/P AC fails, transfer switch opens and then the inverter starts functioning to provide power to load immediately.

Block diagram of Line Interactive UPS

Online UPS In this type of UPS, the system always remains on battery, whether mains ac is present or not. When mains ac is present, it provides power to DC supply of inverter section as well as charges the battery simultaneously. When mains ac is not present, it will run the connected load till the battery has a recommended dischargeable level.

Block diagram of Online UPS

The End …… Thank You ……