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Cheap, high amp dc power supply?

Discussion in 'Electronic Basics' started by twags6, Apr 21, 2005.

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  1. twags6

    twags6 Guest

    Is there any way to make a dc power supply capable of 50+ amps at
    12-13.8 vdc? Basically, I'm looking for something to simulate the
    power from a car without the whole battery and charger setup. Parts
    express sells a nice rackmount one, but I'd rather not part with $190.

    TIA

    Trevor
     
  2. Tom Biasi

    Tom Biasi Guest

    Hi Trevor,
    What is the application for this supply?
    If you need nice clean regulated power you can spend more than the $190.00
    that you quoted.
    When I worked on high current mobile transceivers I would use the battery
    and charger set up, best power for the money.
    Regards,
    Tom
     
  3. twags6

    twags6 Guest

  4. exxos

    exxos Guest


    the regulator is easy, any switchmode chip powering a external fet will do
    the job, the hardest part is finding a transformer which will kick out
    50amps.....

    Chris
     
  5. JeB

    JeB Guest

    u might find something on eBay for about half that.
     
  6. Byron A Jeff

    Byron A Jeff Guest

    Neither of these. Linear regulators will burn up a whole lot of power.
    The 1230psu circuit above will have to dissapate 360W of power. Much less
    than 50% efficiency.
    Why not an isolation transformer like this one:

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4665&item=7509045051&rd=1&ssPageName=WDVW

    The 1KVA is 66 percent more than the 600 VA the original poster requested.
    And it'll be isolated.

    Essentially you want to switchmode power from a 170 VDC filtered source.

    But even at 90% efficiency you'll still have to get rid of 150 W of heat.

    BAJ
     
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