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PC power supply Output 24VDC

Discussion in 'Power Electronics' started by Khatana, Jul 17, 2013.

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  1. Khatana

    Khatana

    4
    0
    Jul 17, 2013
    Dear all,
    I have a standard PC power supply and want to use for my general requirements other than PC.
    Its 10 pin connector shows +12V and -12V so can i get 24V out by connecting these two pins.
    Please reply
     
  2. BobK

    BobK

    7,682
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    Jan 5, 2010
    Yes, but the current is limited to what the -12V can supply, which is usually quite small.

    bob
     
  3. Khatana

    Khatana

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    0
    Jul 17, 2013
    But it sure that i can get 24v from ordinary PC supply
     
  4. BobK

    BobK

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    1,688
    Jan 5, 2010
    I will let someone else answer since you don't believe mine.

    Bob
     
  5. duke37

    duke37

    5,364
    771
    Jan 9, 2011
    Why not put a meter between the -12V pin and +12V pin and see what you get?
     
    partyanimallighting likes this.
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
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    Jan 21, 2010
    You will get 24V, but it will not be 24V with respect to the ground connection.

    Voltage is a difference.

    In this case the difference between ground and +12V is 12V, and the difference between ground and -12V is also 12V, but in the opposite direction.

    So, the difference between -12V and 12V is 24 volts (12V to get from -12 to ground, plus another 12V to get from ground to +12V)

    It's a bit like if you live on a straight road running north-south. One of your friends lives 12 miles north of you, the other 12 miles south of you. Thus they are 24 miles apart.
     
  7. Khatana

    Khatana

    4
    0
    Jul 17, 2013
    Dear Duke,
    I hav'nt supply but suppose to buy but before that want to confirm according to my requirement
     
  8. Khatana

    Khatana

    4
    0
    Jul 17, 2013
    Dear Steve,
    The device which i want to power up will feed 24v regardless of 0 level b/c we directly feed two cables +12 and -12v without any earth connection so i think it does not matter what is zero potential
     
  9. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,496
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    Jan 21, 2010
    What current does your equipment require and what current can the power supply's -12V rail supply (it's almost universally under 1A)
     
  10. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    If you intend to buy a power supply, and you only need 24V, why not buy a 24V power supply? It will likely be cheaper and smaller and provide more current than a PC power supply will at 24V.

    Bob
     
    partyanimallighting likes this.
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