Power Supply PPT
Transcript of Power Supply PPT
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Power SupplyPower supply - Internet URL
http://www.pcguide.com/ref/power/sup/index.htm
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Purpose of the Power
Supply
Convert household power into a form thecomputer can use.
Provides power to every device in thecomputer.
The Power Supply converts AC (alternatingcurrent) which is external power to DC (direct
current) internal power that the computer canuse.
Link to AC/DC Voltage ConversionInformation
How Computer Work Video (Old Version)
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Roles of the Power SupplyLink to the Role of the Power Supply
Stability provides sufficient power to PC.
Cooling - The power supply contains the main
fan that controls the flow of air through the PCcase.
Energy Efficiency - Newer PC power supplieswork with components to reduce the amount
of power they consume when idle. Expandability - The capacity of your power
supply is one factor that will determine yourability to add new drives to your system
A power supply is responsible for 28% of
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Household Power &
Problems
Household Power the external power sourcethat comes into the wall.
Power Problems that may lead to powersupply problems.
Line Noise
Surges
Lightening strikes Brownouts
Blackouts
Link to Household Power and Problems
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Line Noise
Line Noise - Line noise
consists of small
variations in the voltagelevel delivered to the
computer. Noise that
the power supply
cannot handle cancause it to malfunction
and pass the problem
on to your motherboard
or other internal devices
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Surges
This is a temporary increase of voltage
that can last just a few thousandths of a
second, but in this time the voltage canincrease from 110 to 1,000 volts or even
higher.
Voltage surges can disrupt or evendamage your computer equipment
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Lightening Strike
Enormous amount of electricity involved
in a storm, a strike near your PC--near
meaning within several miles--caninduce currents in metal objects.
Any wire that comes in from the outside
and attaches to your PC can become aconduit for a pulse of destructive energy
such as a telephone line or power cord.
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Brownout and Blackout
Brownout - when a brownout occurs, the
voltage drops from its normal level to a
lower voltage and then returns; in someways, it's like the opposite of a surge.
Blackout - A blackout, of course, is whenthe power totally fails.
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Basic ElectricityLink to Electrical Basics
This is an excellent site to link students
to the basics of electricity. This may be
to in depth for the IT Essentials Class. Idid not add this information to the
student worksheet. I added this page in
case instructors would like to teachadditional information about electricity
related to the power supply.
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Parts of the Power Supply
Internal PowerParts of the Power Supply
Power supplies generate high voltages internallyand can be dangerous.
Unless you have been specifically trained to workinside power supplies, you should not open one.
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Power Supply SpecsInput Voltages and Tolerances
Input Voltage Range acceptable range
of input 85v-135v AC or 170v-270v AC
Output Rating (Watts) output of powermeasured in watts
Link to
Calculating Watts
http://www.pcguide.com/ref/power/sup/spec_Elec.htmhttp://www.pcguide.com/ref/power/ext/basics_Power.htmhttp://www.pcguide.com/ref/power/ext/basics_Power.htmhttp://www.pcguide.com/ref/power/ext/basics_Power.htmhttp://www.pcguide.com/ref/power/ext/basics_Power.htmhttp://www.pcguide.com/ref/power/ext/basics_Power.htmhttp://www.pcguide.com/ref/power/sup/spec_Elec.htm -
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Power Switch
Power switches to the power supply have
changed over time.
OlderPC/XT form factor computer was turnedon by a switch in the back of the computer.
AT form factor added a remote switch on the
front of the computer connected to the power
supply in the back.
ATX/NLX form factor uses an electric switch
connected to the motherboard that uses a
feature called Soft_Power to turn on the
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Voltage Selector Switch
Normally dualvoltage selector tobe set at either110/220v.
110 Normalvoltage setting
220
For settingsout of the U.S.
If a 110v is set to220v damage can
occur.
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Motherboard Connector
Most important
connection.
Supplies power toother devices
through the
motherboard. Wires are made of
copper. ATX 20
pin
Older P8 & P9
Or P1 & P2
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Motherboard Connectors
Colors are used to depict the about of
voltage each wire may carry. (Most but
not all manufactures follow it.) The P8 and P9 must be inserted correctly or
the motherboard could be ruined. (Black to
Black your motherboards back, red to red
your motherboards dead.)
Power supply motherboard connectors are
based on the form factor of the motherboard.
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Motherboard Connector
Voltages
P8 P9
ATX
Style
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Drive Connectors
The power supply provides power to internalhard disk, floppy disk, CD/DVD and other drivesdirectly, through four-wire connectors that are
designed to attach to the rear of each drive The number of connectors that come with a
system may vary.
There is a specific smaller floppy drive
connector. Multiple larger four pin connectors may be used
on hard drives, CD-ROMS, and DVD.
A Y-Connector may add flexibility to drive
connectors but is not recommended.
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Drive connectors
Hard drive
CD-ROM
Floppy drive
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Power Supply Fan
Primary cooling source for the entirePC.
Power supply fans may be made ofdifferent components and movedifferent levels of air.
The fan is usually the first piece of thepower supply to fail because of dirt inthe air.
Most computers use additional auxiliary
fans to help cool the entire PC.
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Additional Hardware Help
Sysopt.com
tomshardware.com
cnet.com
http://sysopt.com/http://tomshardware.com/http://cnet.com/http://cnet.com/http://tomshardware.com/http://sysopt.com/