WELCOME

UNIVERSITY COLLEGE OF ENGINEERING

SUBMITTED BY:-

RAJESHCOLL. ROLL NO.:- 09/117Elec. & Comm. Engg.

May 28th,2012

To June 27th

2012

Presentation

UNINTERRUPTIBLE POWER SUPPLY

(UPS)

On

CONTENTS INTRODUCTION

PARTS OF UPS SYSTEM

BLOCK DIAGRAM

WAVEFORMS

TYPES

APPLICATIONS

DIFFERENCE B/W UPS & INVERTER

INTRODUCTION

UNINTERRUPTIBLE POWER SUPPLY is a device that provides battery backup when the power fails or drops to an unacceptable voltage level

The Switchover time must be small (2 to 4 ms) enough to not cause break in the operation of the loads.

PARTS OF UPSUPS SYSTEM contains the following parts :- CHARGER CARDBATTERYINVERTER CARDDISPLAY CARDEMI FILTERSTABLIZERBUZZERFAN

CHARGER CARD:- It consists of a rectifier which converts AC in to DC to charge the Battery.

Input Output Main AC supply DC

.

RECTIFIREBATTE

RY

INVERTER CARD:- It converts the DC into AC.

INVERTERBATTER

YDC AC

EMI Filter:- An EMI (Electromagnetic Interference) filter helps to reduce spikes and electrical noise.

INVERTER

EMI Filter

AC with Noise & spikes

Pure AC

STABLIZER:-Regulates the voltage to the constant range that is safe for the loads.

DISPLAY CARD & BUZZER :-

•LEDs are used to indicate the user about the UPS status. Status :- overloading, charging ,online/ offline.

•BUZZER is used to give warnings like: FAN:-

It is used for the cooling of UPS System.

Low batteryOverloading

BLOCK DIAGRAM

RECTIFIER

INVERTER

EMI Filter

BATTERY

STATIC SWITCHS

S1

STATIC SWITCH

S2

LOAD

UPS SYSTEM

BUZZER

Bypass AC

Main AC

DC ACPURE

AC

S2 : ONWhen mains fails

UPS WAVEFORMS

TRUE SINEWAVE

MODIFIED SINEWAVE

SQUARE WAVE

UPS WAVEFORMS

-170

0

170

0 4 8 12 16 20

TIME (ms)

VO

LT

AG

E

TRUE SINEWAVEMODIFIED SINEWAVESQUARE WAVE

ON-line UPS:-1.In ON-Line UPS INVERTER Card is always active.2.Static Switches S2 :- Always ON S1 :- generally OFF. When inverter fails: S1:- ON.

3. There is zero switchover time.OFF-Line UPS:-1.Input is directly connected to Output.

2.Switches S1: Normally ON S2: OFF when mains fails: S2: ON

3.There is switch over time of 2 to 4 msec.

TYPES

RECTIFIER

INVERTER

EMI Filter

BATTERY

STATIC SWITCHS

S1

SWITCH S2

LOAD

Bypass AC

Main AC

DC ACPURE

AC

The ON-line OFF-Line UPS can be explained with the help of this block diagram:-

APPLICATIONS:-

UPS generally used , where data loss causes a serious problem like in:-

ComputersOperation TheatersBanks Control Room applications

DIFFERENCE B/W UPS & INVERTER

UPS INVERTER

It has high switching speed & very low switchover time(2 to 4 ms).

It is used for computer applications.

Output is sine wave.

It has low switching speed & high switch over time (20 to 40 ms)

It is used for home appliances like TV , Fan , Tube-light etc.

Output is square wave.

Thank you

ANY QUERY ?