power supply ventilator

Discussion in 'Computer Information' started by kwijlebabulus, Feb 3, 2004.

  1. kwijlebabulus

    V W Wall Guest

    Regardless of what you'd *expect* to find, every PC power supply uses this
    type of input circuit. Just think how large a 400-500 W 60 cycle transformer
    would be!
    The output circuits do use a trannsformer to derive the low voltages.
    This runs at a frequency of 40-50 kilohertz, so the core can be much smaller.
    By doing the switching at the higher voltage, the transistors don't have to
    carry as much current. All in all, it's a pretty clever circuit. That's
    why the essentials of it have been around so long, starting with the AT PS.

    Virg Wall
    V W Wall, Feb 5, 2004
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  2. kwijlebabulus

    labatyd Guest

    400W, I'm going to guess about 3 sq inch core at 68 hz. From an old book I
    OK. I'll take your word for it. Makes sense. I understand the concept of
    invertors. Too bad I threw out the old one months back. If I recall though
    it was much smaller than 300W, closer to 150W. The one in my current system
    was replaced under warranty.

    I really don't feel there is much cause for concern though. A voltage rating
    on the capacitors should give a clue which ones to watch for and like you
    say "bleeder resistors" take care of that anyway.
    labatyd, Feb 5, 2004
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  3. well folks

    thanx for all the information

    i'll let you know as soon as i have changed it

    greets and thanx

    kwijlebabulus, Feb 5, 2004
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