Battery Charger Design

Discussion in 'General Electronics Chat' started by Alex.T, Apr 11, 2013.

  1. Alex.T

    Thread Starter New Member

    May 16, 2012
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    I'm tinkering with a battery charger project and trying to define the following:

    The application has a requirement of having a wide input voltage range, ~90-300VAC to then be stepped down to 12 or 24VDC. I know of many manufacturers who have this sort of set up and I know for a fact that they don't use a transformer. How else could it be done? Can somebody point me in the right direction?

    Thanks,
    Alex
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,023
    3,236
    A switching converter that operates from the a wide variation of mains voltage is used which efficiently converts the mains voltage to the desired dc voltage. They do use a transformer for isolation but it is in the high frequency switching loop so the transformer can be much smaller than a transformer operating at the main's frequency.
     
    Last edited: Apr 15, 2013
  3. Alex.T

    Thread Starter New Member

    May 16, 2012
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    Please excuse my noob ness, I've never heard of these before. Can you show me the spec sheet of one?
     
  4. #12

    Expert

    Nov 30, 2010
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  5. crutschow

    Expert

    Mar 14, 2008
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  6. Dodgydave

    Distinguished Member

    Jun 22, 2012
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    Use an ATX power supply as that is ready available giving out 12V , they can be modified to be variable, or you can build your own which is harder.

    Failing that use an old laptop psu they will give out 12v to 20v, they can also be modified to give voltages down to 3v or less.

    http://www.youtube.com/user/DodgyDavez
     
    tinkerman likes this.
  7. Alex.T

    Thread Starter New Member

    May 16, 2012
    12
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    Thanks for all the replies. This is something I'm trying to do for work, it's more of an industrial application so I can't really depend on an ATX power supply. I will keep digging into and learning of these SMPS. If you have more resources, throw them at me :)

    Thanks.
     
  8. Alex.T

    Thread Starter New Member

    May 16, 2012
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    Anybody mind posting a link to a data sheet for one of these that are AC to DC smps? Can't seem to find any...
     
  9. Dodgydave

    Distinguished Member

    Jun 22, 2012
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  10. genma

    New Member

    Apr 7, 2013
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    can anyone help me?

    i`m having a problem wih my battery charger.
     
  11. crutschow

    Expert

    Mar 14, 2008
    13,023
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    Please don't hijack someone else's thread. Start a new one.

    And tell us what your "problem" is. We're not clairvoyant.
     
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