This document provides an overview of an uninterruptible power supply (UPS) system. It describes the key parts of a UPS including the charger card, battery, inverter card, and display card. It also includes block diagrams that show how power flows through the UPS from the main AC supply to the inverter and loads. The document discusses different types of UPS systems, common UPS waveforms, applications of UPS systems, and key differences between UPS systems and inverters.

2. UNIVERSITY COLLEGE OF ENGINEERING
SUBMITTED BY:-
May 28th,2012 RAJESH
To COLL. ROLL NO.:- 09/117
June 27th 2012 Elec. & Comm. Engg.

3. Presentation
On

4. CONTENTS
 INTRODUCTION
 PARTS OF UPS SYSTEM
 BLOCK DIAGRAM
 WAVEFORMS
 TYPES
 APPLICATIONS
 DIFFERENCE B/W UPS & INVERTER

5. 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.

6. PARTS OF UPS
UPS SYSTEM contains the following parts :-
 CHARGER CARD
 BATTERY
 INVERTER CARD
 DISPLAY CARD
 EMI FILTER
 STABLIZER
 BUZZER
 FAN

7. CHARGER CARD:- It consists of a rectifier which converts AC in
to DC to charge the Battery.
Input Output
Main AC supply DC
.

8. INVERTER CARD:-
It converts the DC into AC.
DC AC

9. EMI Filter:-
An EMI (Electromagnetic Interference) filter helps
to reduce spikes and electrical noise.
AC
Pure
with
INVERTER Noise EMI Filter AC
&
spikes
STABLIZER:-
Regulates the voltage to the constant range that
is safe for the loads.

10. 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:
 Low battery
Overloading
FAN:-
It is used for the cooling of UPS
System.

11. BLOCK DIAGRAM
Bypass AC
STATIC
LOAD
SWITCHS S1
EMI PURE STATIC
DC AC
RECTIFIER INVERTER Filter SWITCH S2
AC
S2 : ON
Main AC BUZZER
When mains fails
BATTERY
UPS SYSTEM

12. UPS WAVEFORMS
 TRUE SINEWAVE
 MODIFIED SINEWAVE
 SQUARE WAVE

13. UPS WAVEFORMS
170
TRUE SINEWAVE
MODIFIED SINEWAVE
SQUARE WAVE
VOLTAGE
0
0 4 8 12 16 20
TIME (ms)
-170

14. TYPES
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.

15. The ON-line OFF-Line UPS can be explained with the
help of this block diagram:-
Bypass AC
STATIC
LOAD
SWITCHS S1
PURE
DC AC EMI SWITCH
RECTIFIER INVERTER AC S2
Filter
Main AC
BATTERY

16. APPLICATIONS:-
UPS generally used , where data loss causes a serious
problem like in:-
 Computers
 Operation Theaters
 Banks
 Control Room applications

17. DIFFERENCE B/W UPS & INVERTER
UPS INVERTER
 It has high switching speed  It has low switching speed
& very low switchover & high switch over time (20
time(2 to 4 ms). to 40 ms)
 It is used for computer  It is used for home
applications. appliances like TV , Fan ,
Tube-light etc.
 Output is sine wave.  Output is square wave.

18. ANY QUERY ?