Buck,Boost,Inverting Converters

Discussion in 'Homework Help' started by Raikiri, Mar 23, 2009.

  1. Raikiri

    Thread Starter Member

    Mar 22, 2009
    16
    0
    I've attempted this but I'm not sure if I have the right answers or not, questions are as follows:

    For all three circuits,

    My answers were as follows:
    1) Vin = 0.533V
    2) Vin = -130V
    3) Vin = 7.677V

    thanks for your help!
     
    Last edited: Mar 2, 2010
  2. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Without actual circuit values other than Vout=7V and duty cycle=21%, it's hard to give a answer ..

    Since first circuit is a buck type I would expect Vi to be greater than Vout - 0.333 volts seems wrong - maybe you meant 33.3V

    Second is a boost type - at 21% duty cycle expect Vin to be only slightly less than Vout - say around 6V. I doubt -140V is correct.

    Not sure about the third - you could try a simulation and watch what happens with parameter changes. It's obviously negative output with positive input - buck behaviour? Say Vin=30V ????

    No simulator?

    http://focus.ti.com/docs/toolsw/folders/print/tina-ti.html

    or

    http://www.simetrix.co.uk/ - limited no. of nodes in freeware schematic
     
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