Hi, I have set-up a Boost DC-DC Converter the way my lab sheet shows and Im getting an incorrect Output waveform.

I have used the following parameters:

DC Source = 100V
I = 0.001H
C = 0.0001F
R = 50 ohms
Pulse = T = 0.001sec, Pulse width = 10% for a duty ratio 0.1
2 IGBT's with default parameters and a NOT gate

So for Vout, it should be equal to 100/1-0.1 = 111.1V
But the graph shows the wrong value and the form of it is wrong.

Our lecturer showed us his and the set-up was exactly the same but when he ran the simulation he got the right amount and right form of the output.

I can't figure out what is causing this. Can anyone tell me how this is possible to use the same set-up and parameters and not get the same output? It is very frustrating and there is about 12 of us who are getting the same results.

 

Anyone know why?

 

If you are getting a higher voltage it means it is operating in DCM. Try it in CCM by decreasing the output resistor.

 

The parameters of L, C, R and Vin are set in the lab. The pulse generator parameters were just randomly chosen so I think it might have something to do with the value of T

 

The parameters of L, C, R and Vin are set in the lab. The pulse generator parameters were just randomly chosen so I think it might have something to do with the value of T

Yes, switching frequency can affect operation in CCM or DCM because the ripple current in the unductor is frequency dependent.

Decrease T to 0.00001s.