How to prevent line voltage drop of Batteries

Discussion in 'General Electronics Chat' started by edliu, Feb 27, 2011.

  1. edliu

    Thread Starter New Member

    Feb 22, 2011
    11
    0
    Hi,

    I have a question. What can I do to be able to substain a nominal voltage of 48V input from a Lithium polymer batteries of 12 of them in series(12S). I believe that after a certain usage, the voltage will drop to below 48V. However, my equipment needs to be on constant 48V input.

    Please advise me on how I can achieve it.

    Thanks!!!
     
  2. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    Use a buck boost converter.
     
  3. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,766
    928
  4. edliu

    Thread Starter New Member

    Feb 22, 2011
    11
    0
    How does this boost converter help? Please advise
     
  5. Ctenom

    Member

    Nov 1, 2010
    59
    1
    Buck boost converters take a lower voltage and increase it. However i believe Kermits idea is a much better one. how much power are you expecting to draw? Have you got low voltage protection for your battery? I wouldn't take a lipo cell below 3.0-3.5v (40v in your configuration) after that it gets dangerous. Also make sure they are all brand new and of the same make and model purchased at the same time. Ideally i would have something monitoring EVERY cell. Four/five 12v lead acid batteries would be better if used with Kermits idea
     
  6. russ_hensel

    Well-Known Member

    Jan 11, 2009
    818
    47
    A buck boost can both step down and up. As a switching converter it does not dissapate energy as heat ( compared to a linear regulator ). Thus you may not need as many cells and batteries stay useful even after the voltage sags below the required voltage.
     
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