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Buck-Boost Converter Problem

  1. Oct 30, 2016 #1
    1. The problem statement, all variables and given/known data
    jQL1cyW.png
    Image Link
    2. Relevant equations
    Switching Frequency ##f_s=\frac{1}{T_s}##
    ##K=\frac{2L}{RT_s}##, ##K_{CR}=(D')^2##
    ##R=\frac{V_o^2}{P_L}##
    In CCM: ##D'=(1-D)##, ##D'=\frac{-DV_{IN}}{V_O}##
    In DCM: ##D_2=\sqrt{K}##, ##\frac{V_O}{V_{IN}}=\frac{-D_1D_2R}{2Lf_s}##

    3. The attempt at a solution
    See attached .pdf for my work. Everything makes sense until I get a value greater than 1 for ##D_2##. (Where ##D_2## is the second region of a full period. In DCM regions 1 and 2, either diode or transistor are conducting. In region 3 neither diode or transistor is conducting and diode current is 0.)
     

    Attached Files:

  2. jcsd
  3. Nov 5, 2016 #2
    Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
     
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