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Thread: need negative voltage to power PSU

  1. #1
    Variable Bitrate
    Join Date
    May 2002
    Posts
    290

    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
    Location
    MA
    Posts
    151
    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
    Lambda
    Datel
    Recom
    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
    Location
    London, Ontario, Canada
    Posts
    2,464
    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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