-
Construction Of Uninterruptible Power Supply
CHAPTER ONE -- [Total Page(s) 3]
Page 1 of 3
-
-
-
CHAPTER ONE
1.10INTRODUCTION
As blackouts roll through
power-starved communities, the threat to you and your computer is not
the lack of electricity, but the change in power. When the lights are
off and you are about to start any industrial or computer-based
projects, all your efforts will be wasted. Even when your system acts
as a server, a sudden shutdown could disrupt the processing of many
others. You can make your work immune to the intransigence of rolling
blackouts and protect against many other types of unexpected power
disturbances. Your secret weapon is the uninterruptible power supply or
uninterruptible power source. Commonly called the UPS, this devices is a
cleaver threefold package-a set of battery, an inverter that transforms
the low-voltage direct current of the batteries into the standard
alternating current equivalent to your wall outlet, and a battery
changer that assures that reserve power storage system (the batteries)
with interfaces to mach it to utility power and your computer system. A
UPS differs from an auxiliary emergency power system orstandby generator
in that it will provide instantaneous or near-instantaneous protection
from input power interruptions by means of one or more attached
batteries and associated electronic circuitry for low power users, and
or by means of diesel generators and flywheels for high power users.
While not limited to protecting any particular type of equipment, a UPS
is typically used to protect computers, data centers, telecommunication
equipment or other electrical equipment where an unexpected power
disruption could cause injuries, fatalities, serious business disruption
and/or data loss. UPS units range in size from units designed to
protect a single computer without a video monitor (around 200 VA rating)
to large units powering entire data centers, buildings, or even cities.
The UPS is designed to project against changes, specifically a
temporary loss of electrical supply.
This project focuses on
conversion of AC to DC and from DC to AC power inverters, which aim to
efficiently transform a DC power source to a high voltage AC source,
similar to power that would be available at an electrical wall outlet.
Inverters are used for many applications, as in situations where low
voltage DC sources such as batteries, solar panels or fuel cell must be
converting electrical power from a car battery to run a laptop, TV or
cell phone.
DC and AC Current
In the world today there are
currently two forms of electrical transmission, Direct Current (DC) and
Alternating Current (AC), each with its own advantages and
disadvantages. DC power is simply the application of a steady constant
voltage across a circuit resulting in a constant current. A battery is
the most common source of DC transmission as current flows from one end
of a circuit to the other. Most digital circuitry today is run off of DC
power as it carries the ability to provide either a constant high or
constant low voltage, enabling digital logic to process code executions.
Historically, electricity was first commecially transmitted by Thomas
Edison, and was a DC power line. However, this electricity was low
voltage, due to the inability to step up DC voltage at the time, and
thus it was not capable of transmitting power over long distances.
V =IR
P=IV = I2R
CHAPTER ONE -- [Total Page(s) 3]
Page 1 of 3
-
-
ABSRACT - [ Total Page(s): 1 ]Uninterruptible power supplies (UPS) are used to provide power when regular utility power is unavailable. Although they are commonly used for providing power in remote locations or emergencies, this is not because they are the same as auxiliary power units, emergency power units or standby generators.Unlike the aforementioned power sources, UPS provides an immediate and continuous supply of power to a device, hence protecting it from power interruption and allowing time for auxiliary or emerge ... Continue reading---
