Buck-Boost Converter Problem

  • #1

Homework Statement


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Homework 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}##

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.)
 

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Answers and Replies

  • #2
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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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