Connect with us

PSpice boost converter output voltage problem

Discussion in 'Power Electronics' started by orcuns91, Aug 31, 2020.

Scroll to continue with content
  1. orcuns91

    orcuns91

    3
    0
    Aug 31, 2020
    Hi everybody,
    I'm trying to evalute the performance of SiC mosfet in boost converter. After importing the model of the device to pspice, I simulated it in a basic boost converter circuit. However, the output voltage of the circuit is higher than the theoretically expected 800 volts. My values are f=50k Hz Duty=0,75 Vin=200 L=150uH C=10uF. Could you tell where the wrong is by looking at the pictures I uploaded? Thanks in advance
     

    Attached Files:

  2. WHONOES

    WHONOES

    937
    238
    May 20, 2017
    Tried it on my simulator and am getting about 740V. What sim are you using?
     
    orcuns91 likes this.
  3. orcuns91

    orcuns91

    3
    0
    Aug 31, 2020
    Thanks for your answer. I'm using OrCAD capture pspice simulation. In my simulation , the input current is higher than expected. How can I limit the input current? Also, could there be a problem in driving the mosfet?
    The model of mosfet is https://www.rohm.com/products/sic-power-devices/sic-mosfet/sct3022klhr-product.
     
  4. WHONOES

    WHONOES

    937
    238
    May 20, 2017
    I use a simulator called SIMETRIX, have done for many years in my professional life and now in retirement. I think it is the best of the bunch.
    One thing to remember when doing this sort of simulation is that the inductor will need some dc resistance. I generally include it as a small value resistor either before or after the inductor.
    Another is that when using a voltage multiplying circuit such as yours, the input current will increase by the same ratio as the voltage multiplication factor plus a bit to account for losses. Thus if the input is 200V and the output is 800V which is a factor of X4 then with a load of 160R resulting in a current of 5A at the output then, the input current will be 20A.
    You don't get something for nothing.

    See attachments for my schematic and performance graphs
     

    Attached Files:

    orcuns91 likes this.
  5. orcuns91

    orcuns91

    3
    0
    Aug 31, 2020
    Thank you very much for your advice. I will simulate again after reviewing the files.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-