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Why no ZVS buck converter in portfolio

Vikas Dabas1
Prodigy 145 points

Hi,

I have researched a bit and found that much research is done on ZVS buck converters. Also one company also designed these with very low losses( Vic@r ). 

May i know, why ti or any other semi-conductor has not done any work in this field. Unitrod application note is available but no design or EVK or any IC was made ever( not found any).

Kindly help me provide more documents so i can make myself. Or suggest some product of yours to use.

Application: 140Vin, 12V to 60V output and 3KW output.

I had earlier suggested to use FB. But it will not support wide output voltage range. Please help.

Vikas Dabas

  • 0
    Prodigy 145 points

    It seems like you have no interest in new chalenges. All are folowing the same path.

    Let me know if you have any future plans. Add this to suggestion if possible.

    Vikas Dabas

  • 0
    TI__Intellectual 790 points

    Hi Vikas,

    I apologize for the delayed response here. Converters with ZVS transition are well known in industry. There are many ways to achieve this depending on the application. In regards to the specific ZVS products you mentioned, there are some drawbacks to that approach. 1) The switching frequency changes a lot over the operating range. From about mid load to full load, the frequency reduces by about half in order to maintain ZVS. This is not acceptable in many applications. 2) The magnetics (inductor) have very large peak to peak ripple (typically 2X the full load current). This can result is large amounts of core loss. If you look at the datasheets, they recommend (require?) only one inductor vendor. This is another major limitation of those products.

    I'd encourage you to look through some existing TI reference designs for ideas on how to meet your application needs. You can find them here: https://www.ti.com/reference-designs/index.html 

  • 0 in reply to Pradeep Shenoy
    Prodigy 145 points
    Pradeep Shenoy said:
    Converters with ZVS transition are well known in industry.

    I know you are talking about Full bridge ZVS or LLC. Please be specific about non-isolated Buck converters.

    If ZVS Buck are well known, please suggest ti part number or other vendor that does it. As i am unable to find it.

    Pradeep Shenoy said:
    There are many ways to achieve this depending on the application

    Please suggest one or two. it will be enough.

    Pradeep Shenoy said:
    I'd encourage you to look through some existing TI reference designs for ideas on how to meet your application needs

    You have suggested to look in library of thousand of products. why not suggest some good products from you knowledge.

    Pradeep Shenoy said:
    In regards to the specific ZVS products you mentioned, there are some drawbacks

    Yes, they have drawbacks, but least they have a usable product no other one is doing(If i am not wrong).

    Pradeep Shenoy said:
    there are some drawbacks

    Have you tried to overcome these?

    I will not waste you time if i have more knowledge than you. I need an expert advice.

    Vikas Dabas

  • 0 in reply to Vikas Dabas1
    Prodigy 145 points

    Kindly close this thread if not answering.

    Regards

    Vikas Dabas