Uninterruptible power supply

1. WELCOME TO MY
PRESENTATION

2. Submitted By:
Md. Atikul Islam Ashik
162-33-3507
Submitted To:
Kanij Ahmad
Department of EEE
Daffodil International University

3. AC POWER SUPPLY - UPS
TOPIC

4. UPS
UPS stands for Uninterruptible Power Supply. An uninterruptible
power supply (ups) is a device that has an alternate source of
energy that can provide power when the primary power source is
temporarily disabled . The switchover time must be small enough
to not cause a disruption in the operation of the loads

5. • Basic Circuit Diagram of UPS

6. Block Diagram of Simple UPS

7. TYPES OF UPS
There are 3 types of UPS. And they are….
1.Online UPS
2.Offline UPS
3. Line Interactive UPS

8. UPS COMPONENTS
• CONVERTER - AC TO DC
SPD - PROTECTS AGAINST SPIKES AND TRANSIENTS
• BATTERY
STORED ENERGY DEVICE - PROTECTS AGAINST INTERRUPTIONS
• INVERTER – DC TO AC
1.WAVEFORM SYNTHESIS – PROTECTS AGAINST DC OFFSET AND INTERHARMONICS
2.FILTER – PROTECTS AGAINST HARMONICS, NOTCHING AND NOISE
3.VOLTAGE REGULATOR – PROTECTS AGAINST SAGS,SURGES AND FLUCTUATIONS
• MONITOR AND CONTROL HARDWARE / SOFTWARE

9. WORKING PRINCIPLE OF UPS
An uninterruptible power supply (UPS), also known as a battery backup, provides backup power when your
regular power source fails or voltage drops to an unacceptable level. A UPS allows for the safe, orderly
shutdown of a computer and connected equipment. The size and design of a UPS determine how long it
will supply power.
UPS topologies
Different UPS topologies provide specific levels of power protection. A Cyber Power UPS will belong to one
of these three topologies: standby, line interactive, and double-conversion.
Standby is the most basic UPS topology. A standby UPS resorts to battery backup power in the event of
common power problems such as a blackout, voltage sag, or voltage surge. When incoming utility power
drops below or surges above safe voltage levels, the UPS switches to DC battery power and then inverts it
to AC power to run connected equipment. These models are designed for consumer electronics, entry-
level computers, POS systems, security systems, and other basic electronic equipment.

10. WORKING PRINCIPLE OF UPS
A line interactive UPS incorporates technology which allows it to correct minor power fluctuations (under-
voltages and over voltages) without switching to battery. This type of UPS has an autotransformer that
regulates low voltages (e.g., brownouts) and over voltages (e.g., swells) without having to switch to
battery. Line interactive UPS models are typically used for consumer electronics, PCs, gaming systems,
home theater electronics, network equipment, and entry-to-mid-range servers. They provide power during
such events as a blackout, voltage sag, voltage surge, or over-voltage.
A online UPS provides consistent, clean, and near perfect power regardless of the condition of incoming
power. This UPS converts incoming AC power to DC, and then back to AC. UPS systems with this technology
operate on isolated DC power 100 percent of the time and have a zero transfer time because they never
need to switch to DC power. Double-conversion UPS systems are designed to protect mission-critical IT
equipment, data center installations, high-end servers, large telecom installations and storage applications,
and advanced network equipment from damage caused by a power blackout, voltage sag, voltage surge,
over voltage, voltage spike, frequency noise, frequency variation, or harmonic distortion.

11. UPS WAVEFORMS

12. SINE WAVE OUTPUT
The highest quality waveform output is sine wave, which is a
smooth, repetitive oscillation of AC power. Enterprise-level
UPS systems produce sine wave power to operate sensitive
electronic equipment. Sine wave output ensures that
equipment utilizing Active PFC power supplies do not shut
down when switching from utility power to battery power.

13. SIMULATED SINE WAVE OUTPUT
Simulated sine wave output is an approximated sine wave output
waveform. It uses pulse wave modulation to generate a stepped,
approximated sine wave to supply more cost-effective battery
backup power for equipment that does not require sine wave
output. The technology used to produce this type of power output
is less expensive to manufacture and is common in standby and line
interactive UPS systems.

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