Power electronic converter duty ratio

Discussion in 'General Electronics Chat' started by Johnjacob1992, Apr 28, 2015.

  1. Johnjacob1992

    Thread Starter New Member

    Feb 27, 2015
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    I have read from several different sources that the duty ratio for a Cuk converter is
    (Vo/Vin)=(-D/(1-D)

    but several other sources say its:
    (Vo/Vin)=(D/(1-D)


    which is the correct one...i'm tad bit confused..
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    Short answer: The former ((i.e. -D/[1-D]) is correct (from a 'positive' perspective)...

    Note that Ćuk conversion schemes are, in essence, a variant of buck/boost topology (q.v.) hence the similar operation/performance thereof...


    Best regards
    HP
     
  3. Johnjacob1992

    Thread Starter New Member

    Feb 27, 2015
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    [​IMG]

    This is a snippet from the power electronics book from mohan and undeland, they say otherwise...
    furthermore, I did some simulation and I got results which say (Vo/Vin)=(D/(1-D) is correct
     
  4. #12

    Expert

    Nov 30, 2010
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    If you already know the answer, why did you ask?
     
  5. Johnjacob1992

    Thread Starter New Member

    Feb 27, 2015
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    just to make sure....
     
  6. #12

    Expert

    Nov 30, 2010
    16,354
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    The first responder did not accomplish that. Maybe some other people will answer and you can arrive at a two out of three or a three out of five consensus.
     
  7. Johnjacob1992

    Thread Starter New Member

    Feb 27, 2015
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    yeap
     
  8. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
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    The sign on the duty cycle is a matter of convention (specifically "truth" in the logical sense) - I stand by my reply -- On the other hand, if your perspective works for you, fair enough!:) -- 'tho I daresay insistence upon counter-conventionalism seems an unnecessary obstruction to communication... ;)

    Sincerely best regards
    HP
     
    Johnjacob1992 likes this.
  9. Johnjacob1992

    Thread Starter New Member

    Feb 27, 2015
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    Thanks for the reply HP, I was just a bit puzzled as to why different folks used different signs. It makes sense now...Thank you :)
     
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