# 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

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
3,527
675

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
1
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
3,527
675

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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 ??

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• ###### scope1.png
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Last edited: Mar 14, 2014
9. ### tshuck Well-Known Member

Oct 18, 2012
3,527
675
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
1
Okay.. i used 3 phase voltage with different phase angle (abc sequence) you can see references as attached photo

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11. ### tshuck Well-Known Member

Oct 18, 2012
3,527
675
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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