dynamic voltage regulation using buck boost converters for charging of battery

Discussion in 'General Electronics Chat' started by 7miles, Feb 24, 2012.

  1. 7miles

    Thread Starter New Member

    Feb 24, 2012
    8
    0
    hey guys
    i am working on designing a buck boost regulator for chargin of my12 volt (35AH)lead acid battery using 100 WAtt solar pannel as source.
    voltage output of solar pannel varies from 3 volt to 21 volts...
    does any of u guys have a working schematic or working circuit for buck boost regulator
    than please share or atleast tell me from where i start....
    v input = 3 to 21 volts
    vout(regulated) = 12 vdc

    and i am thinking of using either
    of LM25118 or lm5118 or lm3478 switching regulators from national instruments?
    does any of u has a circuit for these ics or can tell me the alternate for these ...
    any help in this regard will be highly appreciated. :)
     
  2. 7miles

    Thread Starter New Member

    Feb 24, 2012
    8
    0
  3. #12

    Expert

    Nov 30, 2010
    16,346
    6,833
    The designs that National produces can be "implemented" if that means you can build them and they will work. But first, you should visit www.batteryuniversity to learn about care and feeding of batteries. In specific, you can't charge a 12 volt battery with a 12.0 volt source.
     
  4. 7miles

    Thread Starter New Member

    Feb 24, 2012
    8
    0
    thanks to senior member #12 for reply.
    but sir i must ask u that if i change the output of that design from 12 volts to 14
    will it work than?
    and the components that are used in national design are available readily across the globe or not?

    a lil time of yours for my help is highly appreciated.
     
  5. 7miles

    Thread Starter New Member

    Feb 24, 2012
    8
    0
    Bump
    anyone?
     
  6. crutschow

    Expert

    Mar 14, 2008
    13,056
    3,245
    Webench would be a good tool to develop a design for your needs.

    Another source is Linear Technology. For example here's a converter the may also do what you want. If you download their free LTspice program they have a ready-made circuit for the complete regulator circuit on that page that your can simulate.

    You'll have to check for local parts availability.
     
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