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Solution and Topology Selection

Josel Go
Expert 6615 points
Other Parts Discussed in Thread: UCC28951

Hi Experts,

Good day.

I need your help. One of our customers is asking for a solution and topology selection for the following requirement.

DC to DC converter
7KW
1000Vdc input
350Vdc output

Keep safe.


Regards,

Josel

  • 0
    TI__Genius 10635 points

    Hello Josel,

    Will you need a topology that is an isolated or non isolated DC/DC converter?

    Regards,

    Jonathan Wong 

  • 0 in reply to Jonathan Wong
    TI__Expert 6615 points

    Hi Jonathan,

    Good day.

    It should be an Isolated DC/DC converter.


    Regards,

    Josel

  • 0
    TI__Genius 10635 points

    Hello Josel,

    UCC28951 is the go to device for high power DC/DC solution with the Phase Shifted Half Bridge (PSFB) topology. You can also choose a Full Bridge LLC (FB-LLC) topology but you will need to keep in mind the min/max voltage since FB-LLC does not have a wide voltage range. We have training videos on the topologies here that you can refer to the customer. Once the device or topology has been selected, please post a new E2E thread so we can direct you to the right expert.

    Regards,

    Jonathan Wong

  • 0 in reply to Jonathan Wong
    TI__Expert 6615 points

    Hi Jonathan,

    Good day.

    Thank you for answering. Our customer has a follow-up question.

    Can you recommend a MOSFET and Gate Driver for the converter?

    And I have a technical question related to the SOA curve:
    In SOA curve that determines the power capacity can handle by the MOSFET in a specific time period.
    If I use topology based on the Soft Switching technique, Can I handle more power in the same time period?

    For EX:
    Here we can Switch on 20 volts and 200 ambers for a 10us period (100khz switching frequency).
    The Question: Can I handle more current as the topology based on the Soft Switching technique ? as its low switching losses and low transient thermal behavior?

    Keep safe


    Regards,

    Josel

  • 0 in reply to Josel Go
    TI__Genius 10635 points

    Hello Josel,

    With regards to a MOSFET And Gate Driver recommendation, please submit a new E2E post so we can direct you to the right expert.

    Soft Switching (SS) improves the power efficiency of a converter compared to hard switching, which is particularly important in high power. So yes, more power will be transferred to the output in the same time period due to the increased efficiency of SS. 

    If you are asking if SS allows you to exceed the Safe Operating Area (SOA) of a MOSFET by applying more power than the MOSFET is designed for, that would be a better question for the expert giving a recommendation on that device.

    Regards,

    Jonathan Wong