BASICS OF UPS - seminar presentation€¦ · Seminar by: S.Murali krishnan 5050910061-B Tech EEE,...

Seminar by:

S.Murali krishnan5050910061-B Tech EEE,SRM University,Chennai

What is UPS?

UPS – Uninterruptible Power Supply is a

standby electrical Power source connected

between the Power Utility and the load.

• Modern Electronic gadgets and computer systems are highly sensitive to the power fluctuations• Disruption of power may lead to Data loss/ corruption/ malfunction etc.• Standby Power Sources - Generators• Starting the generator takes a few minutes. UPS is mainly used as a Power Backup for the above few minutes

• Modern Electronic gadgets and computer systems are highly sensitive to the power fluctuations• Disruption of power may lead to Data loss/ corruption/ malfunction etc.• Standby Power Sources - Generators• Starting the generator takes a few minutes. UPS is mainly used as a Power Backup for the above few minutes

• UPS maintains power instantaneously by switching to battery in the event of a power failure

or a dip (brown out)

• Used to condition the power supply by reducing

spikes and harmonics.

• Designed to correct a variety of power problems -

- Sags – Transient Under voltage

- Surge – Short duration high voltage

- Brownouts – Low voltage for long time

- Spikes – Brief but high energy bursts

- Line noise, frequency variation, switching

transient and Harmonic distortion

• UPS maintains power instantaneously by switching to battery in the event of a power failure

or a dip (brown out)

• Used to condition the power supply by reducing

spikes and harmonics.

• Designed to correct a variety of power problems -

- Sags – Transient Under voltage

- Surge – Short duration high voltage

- Brownouts – Low voltage for long time

- Spikes – Brief but high energy bursts

- Line noise, frequency variation, switching

transient and Harmonic distortion

Three types of UPS

1. Offline UPS

2. Line interactive UPS

3. Online UPS

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1. Offline UPS

6

2. Line Interactive UPS

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3. Online UPS

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Online UPS

� Main components of UPS:

- Rectifier / Battery Charger

- Battery

- Inverter

� Main features for a Good UPS:

- Shortest changeover time < 4mS

- Sufficient battery backup time

- Quality output supply

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Online UPS

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Online UPS - Operation

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS - Input

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Online UPS - Input

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Online UPS - Input

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Online UPS - Input

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS -Rectifier

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� Switching speeds and power ratings – SCR Vs IGBT

IGBT MOSFET

Thyristor IGCT

101 102 103 104

102

104

106

108

Th

yri

stor

IGBT

MOSFET

Pow

er (

VA

)

Switching Frequency (Hz)

IGCT

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS – DC System

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Online UPS – DC System

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS – Inverter

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS – Output

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Online UPS – Output

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Online UPS

�Elements of UPS:

- Input


- DC System

- Inverter

- Output

- Static Bypass

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Online UPS – Static Bypass

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Online UPS – Static Bypass

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Online UPS – Other points

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• Design Factors• Typical Circuit• Typical PCB• Faults• Do’s• Don’ts

Online UPS – Design Factors

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Online UPS – Typical Circuit

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Online UPS – Typical PCB

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Online UPS – Faults

� Overload Trip

� Battery Low trip

� Output OV/ UV

� Over Temperature

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Online UPS – Do’s

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Online UPS – Don’ts

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BASICS OF UPS - seminar presentation€¦ · Seminar by: S.Murali krishnan 5050910061-B Tech EEE,...

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