positive buck boost converter

Discussion in 'The Projects Forum' started by nameshiva, Mar 25, 2012.

  1. nameshiva

    Thread Starter New Member

    Jan 25, 2012
    4
    0
    Sir

    am doing project on digital combination of buck-boost converter to control positive buck boost converter.

    my ref voltage is 5v

    when i am simulating by giving it 3v its giving an voltage of 4.2
    when i am simulating by giving it 5v its giving an voltage of 4.2
    when i am simulating by giving it 7v its giving an voltage of 5.3


    sir can u help me in rectifying the circuit......ill be grateful to u sir
     
  2. crutschow

    Expert

    Mar 14, 2008
    21,389
    6,127
    I can't open a simulink file. Can you post the schematic as a pdf or other more common format?
     
  3. nameshiva

    Thread Starter New Member

    Jan 25, 2012
    4
    0
    Sir,

    thanks for ur reply.......Sir am attaching a pdf file
     
  4. nameshiva

    Thread Starter New Member

    Jan 25, 2012
    4
    0

    sir

    i am sending u a pdf format can u please solve my problem.awating for ur reply as soon as possible
     
  5. djb

    Active Member

    May 17, 2008
    31
    3
    If you are still online and didn't get rid of electronics, you have to understand the 2 different operational modes of step down (buck) and step up (boost). After that you will figure out how to control the mosfets.

    Note: for high side switching you need a P channel mosfet . for N Channel you need 10-12V higher than the source. See mosfet gating Vgs.
     
Loading...