1. K.L.N. COLLEGE OF ENGINEERING
DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING
The Institution of Engineers (India)-Student Chapter
MINI PROJECT CONTEST – February 2016
Short circuit Protection
ABSTRACT:
An electrical short circuit is the most common
cause of accidental fires in domestic, commercial and industrial
buildings. It occurs when the abnormal conditions takes place
in the electrical circuit like over current, insulation failures,
human contacts, over voltages etc.100% of electrical short
circuit originated fire is owing to poor knowledge of electrician
or his carelessness. Most of the electricians learn by becoming
a helper to an experienced one and lack heavily getting the
basic electrical idea.
A regulated power supply is the most
important requirement for the operation of many electronic
appliances which need a constant DC power supply for their
operation. Systems like a laptop or a cell phone or a computer
requires a regulated DC supply to power its circuitry. One of the
ways to provide a DC supply is using a battery. However the
basic constraint is the limited battery life time. Another way is
using an AC-DC converter.
Normally an AC-DC converter consists of a rectifier
section, which consists of diodes and produces a pulsating DC
signal. This pulsating DC signal is filtered using a capacitor to
remove the ripples and then this filtered signal is regulated
using any regulator IC.
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2. Societal Importance:
A 12 volt power supply circuit with short circuit indication has
been designed. It gives well regulated 12 volts DC to power majority of circuits and
also for the bread board assembly. An Add-on circuit of Short circuit indication is also
included to detect the short circuit in the prototype if any. This helps to switch off the
power supply immediately to save the components.