Is it possible to use a Boost Converter & a Buck Converter Together?

Discussion in 'Power Electronics' started by pmap93, Aug 15, 2016.

  1. pmap93

    Thread Starter New Member

    Aug 15, 2016
    15
    0
    Good day!

    I've been working on a small project (9V LED Lamp) which is powered by a 3S 18650 Battery.

    Now, as far as I know, an 18650 battery shouldn't go below 2.8v, that times three (3S) is about 8.4V, and 4.2V per cell at maximum charge, which would be about 12.6 V at 3S.

    I'll need to use a Buck converter to keep the Voltage constant from 12.6 dropped down to a constant 9, but when the battery voltage drops below 9v I'd like to boost it so from range of 8.4v to 8.9, I'm stepping it up to 9V..

    That's why my question :) Can i use a Buck and Boost converter in series?

    Is that even possible? or it's impractical? Maybe a better solution?

    Regards,
    Paolo
     
  2. pmap93

    Thread Starter New Member

    Aug 15, 2016
    15
    0
  3. crutschow

    Expert

    Mar 14, 2008
    13,039
    3,243
    Yes, you need a buck-boost converter.
     
  4. pmap93

    Thread Starter New Member

    Aug 15, 2016
    15
    0
    Hey thank you for replying so promptly!
     
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