ICT Role in 21st Century Education & its Challenges.pptx
Power Supply
1. Group:
MUHD HAFIZ SHAHWEEN BIN MOHD YUSOF SWARAN
08DEU10F2005
MUHD SAFWAN BIN HASSIM
08DEU10F2004
ZULSYAHMI BIN ZUHIR
08DEU10F2034
SYEIKH MUHD AFIQ BIN SYEIKH ZAIBAZLAN
08DEU10F2026
SYIFA BINTI MOHD ZAKI
08DEU10F2116
2.
3. A power supply is a device that
supplies electrical energy to one or more electric
loads.
All electronic circuits need a power supply source
to work.
A regulated power supply is one that controls the
output voltage or current to a specific value
Every power supply must obtain the energy it
supplies to its load, as well as any energy it
consumes while performing that task, from an
energy source.
4. The input is in 120V at 60Hz AC power line.
Alternately, the input may be 240VAC.
Convert AC supply to DC supply.
An ideal constant-voltage power supply would
have zero output impedance at all frequencies.
The voltage would remain perfectly constant in
spite of any changes in output current demanded
by the load.
The ideal constant-current power supply would
accommodate a load resistance change by
altering its output voltage by just the amount
necessary to maintain its output current at a
constant value.
5.
6. a device that transfers electrical energy from
one circuit to another through inductively
coupled conductors.
Commonly used to step the input AC voltage
level down or up.
Transformers are essential for high-
voltage electric power transmission, which
makes long-distance transmission
economically practical.
7. Is an electrical device that
converts alternating current (AC), which
periodically reverses direction, to direct
current (DC), which flows in only one
direction.
Rectifier are made up of diodes.
The process is known as rectification.
8. Filters are electronic circuits which
perform signal processing functions
To remove unwanted frequency components
from the signal, to enhance wanted ones, or
both.
Filter comprising one or
more capacitors, resistors, and
sometimes inductors.
9. Is a circuit that helps maintain a fixed or
constant output voltage.
Voltage ratio of transformation can be
adjusted, or an electronic circuit that
produces a defined voltage.
The regulator fixes the output voltage to the
desired level then maintains that value
despite any output or input variations.
10. Most modern power supplies contain one or
more DC-DC converters.
A DC-to-DC converter is an electronic
circuit which converts a source of direct
current (DC) from one voltage level to
another.
Is used with a power supply to prevent the
need for a second AC-DC supply.
11. All electronic circuits and equipment need a
power supply.
Most equipment uses an AC to DC power
supply.
In most AC to DC supplies, the 120VAC line is
first filtered the stepped up or down to the
desired voltages level then rectified into
pulsating DC, then filtered to a constant DC.
A regulator holds the outputs to a desired
level. A DC-DC converter may also be used to
generate another DC voltage.
