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Thread: 1000w smps based on LUDO3232

  1. #251
    diysmps Senior Member
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    Quote Originally Posted by Silvio View Post
    No I do not think you need to add GDT to drive IGBT in parallel as long as the smps works in full duty cycle. The reason is that if the smps has to work with low pulse width then the bootstrap capacitor will not have time to charge properly and problems may arise.
    If you are going to use feedback then you have to use GDT for sure switching on the IGBT. Here you have to be careful and see that the switching pulse must be at 12- 15v at all times.
    Adding feedback may not be as simple as it seems and if you have no oscilloscope you cannot see what is happening.
    I never built an smps with gate drive transformer and I have no detail for it.

    I will add photo of parallel IGBT from home as I have a problem with uploading files from here.

    Regards Silvio
    Well mr.silvio ,, i will leave about feedback. Now i am fixing pcb.

  2. #252
    diysmps Senior Member
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    Please check my pcb mr.silvioHB3000W v2.pdf

  3. #253
    .... Silvio's Avatar
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    Here is the the schematic for parallel IGBT

    UPIK parallel IGBT.JPG

  4. #254
    .... Silvio's Avatar
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    Quote Originally Posted by Upik View Post
    Please check my pcb mr.silvio


    make corrections as marked with red markings. press on them and see note on side

    HB3000W v2.pdf
    regards Silvio
    Attached Files Attached Files
    Last edited by Silvio; 06-05-2018 at 08:40 PM.

  5. #255
    diysmps Senior Member
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    Hi mr.silvio, i only have some rur3060 diodes and some 30cph03, is that a problem, ??? diode with 2 legs only mur1560 i have
    Last edited by Upik; 06-06-2018 at 01:43 AM.

  6. #256
    .... Silvio's Avatar
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    Quote Originally Posted by Upik View Post
    Hi mr.silvio, i only have some rur3060 diodes and some 30cph03, is that a problem, ??? diode with 2 legs only mur1560 i have

    Both diodes are good use what you think fits best. They are a bit over rated though.

  7. #257
    diysmps Senior Member
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    RUR3060 seems with 30 ampere capability

  8. #258
    .... Silvio's Avatar
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    Quote Originally Posted by Upik View Post
    RUR3060 seems with 30 ampere capability
    Yes the part number says so they are 30A (30)and 600v (60)

    Silvio

  9. #259
    diysmps Senior Member
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    Hi mr.silvio ,, if i change the frequency on the pwm card to 25khz, will the DT Resistor be the same, or have to adjust it again, (without feedback)

  10. #260
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    Quote Originally Posted by Upik View Post
    Hi mr.silvio ,, if i change the frequency on the pwm card to 25khz, will the DT Resistor be the same, or have to adjust it again, (without feedback)
    I know that the dead time will change with frequency but I am not sure which way it will go (smaller or bigger) when you change from a higher frequency to a lower frequency. I understand that you are saying that you leave the same value of resistor that you used at 65Khz.

    I am sorry I do not remember this maybe another member can help you here.

    Regards Silvio

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