DC to DC converter

Discussion in 'The Projects Forum' started by Bellda1, May 3, 2012.

  1. Bellda1

    Thread Starter New Member

    May 3, 2012
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    I need to convert 240 vdc to 12 vdc. how can I get this done?
     
  2. paulktreg

    Distinguished Member

    Jun 2, 2008
    612
    120
    You don't stipulate how much current you require at 12VDC but it could be as simple as two resistors?
     
  3. #12

    Expert

    Nov 30, 2010
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    6,817
    Use a transformer + rectifier + regulator?
    Buy a wall-wart?

    We need you to describe the required current.
     
  4. crutschow

    Expert

    Mar 14, 2008
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    3,236
    It's 240VDC, not AC.
     
  5. aeftimia

    New Member

    Sep 16, 2011
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    There are lots of topologies that can do this. See http://en.wikipedia.org/wiki/DC-to-DC_converter.
    The simplest way I know of is to use a 555 timer to drive a mosfet to switch the dc on and off, then send the output to a transformer to step down the voltage, then rectify the other side.
     
  6. #12

    Expert

    Nov 30, 2010
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    Oops. I assumed that was a typo. Will be interested in discovering where a person finds 240 VDC. Depends quite a lot on how much current is involved. Might be inside an electronic device like a TV.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It's going to take a lot more than a 555 timer, MOSFET and transformer.

    If you're planning on building it yourself, it's going to be a pretty involved project, and involve working with hazardous voltage potentials. You will need an oscilloscope for troubleshooting. If you are new to electronics, this is not a project you should attempt.

    It would be easiest to look for an off-the-shelf solution; however you didn't mention what your current requirements at 12v are.
     
  8. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
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    What you want to do. Is done in primary switched power supply. You will find a lot of ICs that can do this job. These kind of power supplies also require some transformers that may be more difficult to get. I am somewhat puzzled by your request. 240 volt DC. Is quite rare. That kind of DC voltage may be used in say electrical cars. And hence a warning. The site do not allow any automotive topics.
     
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