Power Supply and Casing

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					Power Supply and Casing

       Derek Wells
       4th hour
Definition of Power Supply

 A power supply is a device that
 supplies power to the computer
 from the outlet
   Definition of Case



A computer case most known as a
computer chassis or housing is
the enclosure that holds most of
the computers components.
 How a power supply works

•The power supply converts AC from your homes
outlet into DC which your computer needs to run.
•It adjust the supplied voltage to the levels needed
•It filters the voltages
•Prevents any damaging power from reaching or
take effect at the output.
         Power Supply Brands
•   Samsung
•   Silen x
•   Cool master
•   Topower
•   Enhance
•   Hiper
•   Corsair
         ATX Power supply
• ATX has a 20-pin
  connector for mainboard
  power
• +12, -12, +5, -5, 3.3V
  output
• The on/off switch of ATX
  units is controlled through
  the motherboard
           AT Power supply
• There are 2- 6 pin connectors that supply
  power to the motherboard.
• There are 4 voltages that AT supplies +5, -5
  +12, -12.
Components



        ATX power supply
AT computer supply
                   ATX 2.0
• Instead of 20 pin connectors like
  the ATX power supply has the
  ATX 2.0 has a 24 pin connector
    How the computer uses the
            voltages
• In the power supply the computer uses the
  3.3 voltage and 5 volt to run the digital
  circuits.
• The 12 volt is used to run motors like in the
  disk drive and the fan to keep the computer
  from over heating.
How its converted into DC
             Components
• Y type capacitor
Which is
  connected
  between live and
  neutral ground
  and lead
  electrical shock
  to ground.
                Components

• Manual power
  switch that is on
  the older AT
  power supply
  models
             Components

• Common mode
   choke coils are
  used to suppress
   common mode
        noise
                Components
• Primary
  electrolytic
  capacitor controls
  the input current of
  the power supply
  and changes the
  phase shift
  between the
  current and voltage
        Power supply Pricing
• Power supplies sell for as low as 45 dollars
  up to 500 dollars for the higher end kind
  that put out more voltage and have more
  protection from damage.
                     Desktop Case
• these are primarily
  designed for
  personal/business
  computers that are placed
  on top of a desk. The
  basic objective of these
  cases is to conserve the
  desk space because most
  of the time the monitor is
  placed on top of the
  computer
                  Towers
• These cases can be kept on the floor or on
  top of a desk. There are three types of tower
  cases
• Mini-sized
• Mid-sized
• Full sized
      Computer case modding
• Computer case modding is when you change the
  appearance or components of a computer case.
• People add water cooled fans, lights and more
         Top case manufacture
•   Ahanix
•   Antec
•   Asus
•   Cool master
•   Ever case
              Case Pricing
• On average the computer case can sell from
  anywhere as low at 60 dollars to as much as
  350 dollars if you get modifications for it
                       Resources
• http://computers.pricegrabber.com/power-supplies/p/354/
• http://www.tech-faq.com/types-of-computer-cases.html
• http://www.kitguru.net/components/power-supplies/ironlaw/how-
  computer-power-supplies-work-kitguru-guide/
• http://computer.howstuffworks.com/power-supply.htm
• http://www.pcguide.com/ref/power/sup/index-c.html
• http://computers.pricegrabber.com/power-supplies/p/354/

				
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posted:6/24/2011
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