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DC gain of SMPS transfer function?

Discussion in 'General Electronics Discussion' started by eem2am, Jan 13, 2014.

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  1. eem2am

    eem2am

    414
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    Aug 3, 2009
    Hello,
    The following equation (2A-22) , on page 232 of Basso's book (switch mode power supplies) is the small signal power stage transfer function for a buckboost converter, in current mode, CCM.

    Please advise on what is the DC gain of this transfer function?

    I am actually using it for a flyback (flyback is derivative of the buckboost) and my Ns/Np for the flyback is 0.837.

    Pages 225, 226 explain what the parameters are
    Pages 234, 235, explain how to convert equation 2A-22 for a flyback
    Page 233 also shown as it shows the poles and zeros
     

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  2. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    Pictures are a bit small. Can't read any of it.
     
  3. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
  4. davenn

    davenn Moderator

    13,726
    1,914
    Sep 5, 2009
    its his other nick on that forum


    Dave
     
  5. eem2am

    eem2am

    414
    0
    Aug 3, 2009
    it might be my colleague trying to get one-up on me.

    Basically DC gain will be gotten by putting w=0.
    But there are adjustements to vout and R(LOAD)...due to the trafo.
    Does vout become vout*np/ns?, the book doesn't make this clear
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Check to see if they've also posted about optocouplers recently...

    edit: yeah, that's him. Looks like he spends his time getting caned there and then posting here expecting a different response (and not getting one)
     
    Last edited: Jan 13, 2014
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Don't lie.

    Have a nice holiday.
     
  8. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
  9. davenn

    davenn Moderator

    13,726
    1,914
    Sep 5, 2009
    hey John

    he loves spreading his garbage LOL

    Dave
     
  10. jpanhalt

    jpanhalt

    426
    4
    Nov 12, 2013
    Frankly, I thought that choice of nick's was ironic. A little glyphosate judiciously applied might help.

    John
     
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