Simulation by Matlab

Discussion in 'Homework Help' started by mo2015mo, Mar 11, 2014.

  1. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
    1
    Hi my friend,,,

    I want to building half-wave rectifier using 3-winding transformer ...
    really i'm beginning in Matlab..
    I want anyone to help me in steps or any simple book can help me :rolleyes:

    please help me and thanks in advance..
    [​IMG]
     
  2. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
    1
    How we can building half-wave rectifier by 3-winding transform???
     
  3. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    [​IMG]
    Remove either the left, or right, column of diodes.
    See here.

    Have you tried using SimuLink in MATLAB to simulate the circuit?
     
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  4. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
    1
    This is my attempt,,
    How i can convert red-dashed wire to Black-solid wire ??
     
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  5. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
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    I connected it as attached photo .. but the output is ZERO...??? what's wrong ??
     
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  6. tshuck

    Well-Known Member

    Oct 18, 2012
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    Google suggested this...
     
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  7. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
    1
    okay .. But how we can built it by 3 winding transformer ...??
     
  8. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
    1
    Why when i applied 1sin(wt) to three sources with different in phase angle.., i got a half-wave rectifier as shown below with amplitude is 0.2 ??
     
    Last edited: Mar 14, 2014
  9. tshuck

    Well-Known Member

    Oct 18, 2012
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    What are the specifics of the models?

    Also, you should include the different phases in the scope output for reference...
     
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  10. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
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    Okay.. i used 3 phase voltage with different phase angle (abc sequence) you can see references as attached photo
     
  11. tshuck

    Well-Known Member

    Oct 18, 2012
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    It looks like the forward voltage for your diode model is about 0.8V.

    Edit: Indeed, if the values shown here are the defaults, then the forward voltage is 0.8V.
     
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  12. BytetoEat

    New Member

    Mar 5, 2014
    25
    5
    well, this is either the diode drop of approx 0.6 volts coming into effect or some type of multiplier on your probe... those are my guesses.

    if your matlab model is simulating realistic diodes, then to turn them on they need a voltage drop above 0.6 volts.. so thats why you have 0.2 left.

    Edit: whoops! shoulda waited to post for above answer.. yep +1 ^
     
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  13. mo2015mo

    Thread Starter Member

    May 9, 2013
    157
    1
    Really thanks for you,,,
    But why when i connected transformers as Y-connected to the circuit ,i don't get the half-wave signal .see attached photo
    In other words, what's the parameters i can adjust in order to get half-wave output?? i attached the parameter of transformer
     
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