presentation on UPs

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Welcome To The

Presentation of UPs

Ups( Uninterruptable Power Supply)

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An uninterruptable power supply (Ups) is a device that allows a computer to keep running at least a short time .when primary power source is lost .It also

provides protection from power fluctuation . Thus we can say that Ups is a

device that helps to provide consistent power to computer system

INTRODUCTION

INDEX

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INTRODUCTION

INDEXTYPES OF UPS

Ups

ONLINE UPs OFFLINE UPs LINE INTERACTIVE UPs

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In this type of Ups , the system always remains on the Battery, Weather main is

present or not.

Online UPsINTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

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INTRODUCTION

Battery Charger

Battery DC to Ac Inverter

OUTPUTWhen Main AC is ON

(Block Diagram Of Online Ups)

Inpu

t

Main AC

Online UPsINTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

When Main AC is Present, it provides power to DC Supply Of inverter Section as well as charges the battery simultaneously .

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INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

Online UPs

Battery Charger

Battery DC to Ac Inverter

OUTPUT

When Main AC is cutoff

(Block Diagram Of Online Ups)

Inpu

t

Main AC

When Main AC is not present, it will run the connected load till the battery has a recommended discharge level.

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INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

Advantage of Online UPsWhen we use Online Ups there is no chance of surges , spikes ,

sags ,black out because the Main Ac passes through battery which gives accurate voltage supplies in any condition..

Another advantage is that it passes charge regular through battery so there is no chance of failure of circuit like , change over timing or change over circuit.


INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

Disadvantage of Online UPs In online Ups system always remain on battery, whether the Main

Ac is present or not. When Main Ac is present it supplies DC to battery section for charging as well as battery also send charge to inverter section for Main Output. Due to this no battery life in Online Ups


INTRODUCTION

INDEXTYPES OF UPS

Offline UPs

OFFLINE UPS

ONLINE UPS

When Main AC is present ,AVR provides as output as is the Input mains.

OFFLINE UPS

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INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

Offline UPsAutomatic Voltage Regulator(AVR)

OUTPUT

Running On Normal ACIn

put

Main AC

DC to Ac InverterBattery Charger Battery

Circuit Closed

Open Circuit

Offline Ups use automatic voltage regulator (AVR) to regulate the output voltage close to 220V AC.

Offline Ups are normal weight Ups and are widely used for domestic computers.

(Block Diagram Of Offline Ups)

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Automatic Voltage Regulator(AVR)

OUTPUT

Running On Normal AC is cutoffIn

put


Circuit Open

Circuit Closed

Inpu

t

OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

The Main is to battery changeover time or battery to mains changeover time on offline Ups is very low(3.8 milliseconds) as compared to inverter 500 milliseconds.

(Block Diagram Of Offline Ups)

Offline UPs

Main AC


INTRODUCTION

INDEXTYPES OF UPS

Advantage of Offline UPs

OFFLINE UPS

ONLINE UPSWhen Main AC is present , current passes through AVR(Automatic Voltage regulator) there is no load on battery all time therefore In offline Ups battery life is longer .


INTRODUCTION

INDEXTYPES OF UPS

Disadvantage of Offline UPs

OFFLINE UPS

ONLINE UPS In offline Ups accuracy is less than online Ups because it

passes charge through AVR therefore there would be little chance of surge and spikes passes.

If there is problem in change over circuit it shutdown the PC.

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Line interactive Ups work like online and offline Ups.

OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS

Line Interactive UPS

Line Interactive UPs

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OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Line Interactive UPsOUTPUT

Running On Normal AC


Circuit closed

Circuit Open

Cutoff TimerAutomatic Voltage Regulator(AVR)

Inpu

t In

put

+110 volt

-110 volt0 volt

When main Ac flows normal ,it works like offline UPs

Main AC

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OUTPUT

Under/ over voltage condition


Circuit Open

Circuit closed

Cutoff TimerAutomatic Voltage Regulator(AVR)In

put

+110 volt

-110 volt0 volt

When there is fluctuation in Main AC , Cutoff timer cut the flow path of AC through AVR for specific time thus charge flow through the Battery . At this state Ups works as Online UPs

OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS



Inpu

t Main AC


OUTPUT

Black out condition


Circuit Open

Circuit closed

Cutoff TimerAutomatic Voltage Regulator(AVR)In

put

+110 volt

-110 volt0 volt

When Main AC is not present , it will run the connected load till battery has a recommended discharge level.

OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS



Inpu

t Main AC


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Advantage of Line Interactive UPs

Output power accuracy of line interactive Ups is higher than offline Ups because it passes Main Ac through Battery if there is fluctuation in Main AC.

If there is no fluctuation in Main AC then it bypass through AVR(automatic voltage regulator )which can save Battery Life.


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Disadvantage of Line Interactive UPs

Output power supplies of accuracy is less than online Ups because it works on both AC and battery mode.

System may shutdown if there is problem comes in change over circuit.


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

InverterUPsVs


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

Circuit Sections Of Inverter1. Charging2. Inverter

OUTPUT

On Normal Main AC is present

DC to Ac InverterCircuit Open

Circuit closed

Main ACIn

put

Battery Charger Battery

Inverter supply unregulated power supply when Main AC is present.


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

Circuit Sections Of UPs

OUTPUT



Circuit closed

Main ACIn

put


AVR

Ups supply regulated power supply with the help Of AVR technology when main AC is present

1.Charging2.Inverter3.AVR(automatic voltage Regulator)


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

Change Over Time



Relay

Inpu

t Battery Charger Battery

AVR

Main AC

OUTPUT

The mains to battery changeover time to battery to mains changeover time in offline Ups is very low(3-8 milliseconds) as compared to inverter(500 milliseconds) therefore no chance to shutdown the PC when change over circuit changes switches the connection from main AC to battery mode or from Battery Mode to Main AC.


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

DC to Ac InverterIn

put


AVR

Overload Led

No load Led

Low AC Main Led

High AC Main Led

Low Battery Led

Earth

Main AC

OUTPUT

Buzzer

Automatic Section

On Low Battery /overload Battery Sensor

Relay


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

UPS Power

RatingUPS power Rating


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Power RatingTrue Power (watts) or Apparent Power(VA)

Inverter Vs UPS

UPS power Rating

The power rating of electric component is measured in Watts Or Volt Amperes(VA).

UPS manufacturers mainly used VA to describe the output ratings.

The output rating of UPS determines the maximum load that can be continuously supported by the UPS when the main supply fails.


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

UPS power Rating

Power factor(Pf)In an AC circuit the relationship between real and reactive power is known as Power factor(Pf).

Power Factor(Pf)=watts/VA

Pf values varies between 0.6 to 0.8(normally 0.8)


OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

UPS power Rating

Power RatingFor a Desktop PC(normally load =500 watts)

Required UPS power rating

VA=Watts/Pf 500/0.8=625 VA

For a UPS having power rating=2500 VA

Maximum load that continuously can be supportedWatts=VA*pf

2500*0.8=2000 watts

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QSession&A

OFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

UPS power Rating

Question & Answer Session

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Thank youOFFLINE UPS

INTRODUCTION

INDEXTYPES OF UPS

ONLINE UPS


Inverter Vs UPS

UPS power Rating

Question & Answer Session

Thank you

Documents

presentation on UPs