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Thread: need negative voltage to power PSU

  1. #1
    Variable Bitrate
    Join Date
    May 2002

    Question need negative voltage to power PSU

    I recent purchase a cheap power supply unit for $50.00 The unit requires -38 to -72 vdc to operate. How can I produce the that voltage from a car battery.

    Here is the specs on the unit.

    Electrical DC Voltage Input Range -38Vdc to -72Vdc
    Current Input (Max) 30A at - 38Vdc per module
    Power Output 750W
    Current Output (Max)
    (+5) 39A
    (+3.3) 37A
    (+12) 37A
    (-12) 1.4A
    (-5) 1.0A
    Power Cable-AWG, Length
    and Plug Type #10, 12 ft, 3 tinned leads
    Input Receptacle Compaq

    Please email if there is a solution.

  2. #2
    Constant Bitrate jboy's Avatar
    Join Date
    Oct 2001
    Yikes! You've gone industrial!
    There are plenty of DC-DC converters that can get you the right voltage but for that kind of current it's gona be expensive.
    Also look at the lowest imput voltage, needs to be <9V if you want to keep it goin while starting you car

    try searching for these
    If you come out talking sh1t don't try to turn around and wipe you azz.

  3. #3
    Retired Admin Aaron Cake's Avatar
    Join Date
    Jan 2000
    London, Ontario, Canada
    Getting that voltage is not easy. In fact, it will be significantly easier and cheaper to just buy/build a supply that takes 12V as it's input.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
    Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
    "If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."


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