basics of ups - seminar presentation
TRANSCRIPT
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
UPS maintains power instantaneously byswitching 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 UPS1. Offline UPS 2. Line interactive UPS 3. Online UPS
5
1. Offline UPS
6
2. Line Interactive UPS
7
3. Online UPS
8
Online UPSMain components of UPS:- Rectifier / Battery Charger - Battery - Inverter Main features for a Good UPS: - Shortest changeover time < 4mS - Sufficient battery backup time - Quality output supply9
Online UPS
10
Online UPS - Operation
11
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass12
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass13
Online UPS - Input
14
Online UPS - Input
15
Online UPS - Input
16
Online UPS - Input
17
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass18
Online UPS -Rectifier
19
Online UPS -Rectifier
20
Online UPS -Rectifier
21
Online UPS -Rectifier
22
Online UPS -Rectifier
23
Online UPS -Rectifier
24
Online UPS -RectifierSwitching speeds and power ratings SCR Vs IGBT
Power (VA)
Thyristor
108 106 104 102
IGCT IGBT
Thyristor
IGCT
MOSFET
IGBT
MOSFET
101 102 103 104 Switching Frequency (Hz)25
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass26
Online UPS DC System
27
Online UPS DC System
28
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass29
Online UPS Inverter
30
Online UPS Inverter
31
Online UPS Inverter
32
Online UPS Inverter
33
Online UPS Inverter
34
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass35
Online UPS Output
36
Online UPS Output
37
Online UPSElements of UPS:- Input - Rectifier / Battery Charger - DC System - Inverter - Output - Static Bypass38
Online UPS Static Bypass
39
Online UPS Static Bypass
40
Online UPS Other points Design Factors Typical Circuit Typical PCB Faults Dos Donts41
Online UPS Design Factors
42
Online UPS Typical Circuit
43
Online UPS Typical PCB
44
Online UPS FaultsOverload Trip Battery Low trip Output OV/ UV Over Temperature
45
Online UPS Dos
46
Online UPS Donts
47
48