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Original question:

UCC28950-Q1: Secondary side Rectification

UCC28950-Q1: Centre tapped or Full bridge synchronous rectifier

Venkatesh B
Intellectual 783 points
Part Number: UCC28950-Q1
Other Parts Discussed in Thread: UCC28951, UCC28950, UCC27714

Tool/software:

Hi Ti team

I am planning to do 6.6KW EV OBC

Input is 230V,50HZ output is 350V to 470V DC.i am planning to use PSFB of DC-DC stage

To increase efficiency planning to use SR at secondary.

I am confused which one to be used either center tapped transformer or full bridge transformer

Ucc28950IC support only two SR signal otherwise logical circuits used for four switches.

which one i proceed ,help me to select and  advice to tackle design complexity

Thank you

venkatesh B

  • 0
    TI__Guru* 86266 points

    Hello,

    Your inquiry is under review and I will get back to you shortly.

    Regards,

  • 0 in reply to Mike O'
    TI__Guru* 86266 points

    Hello,

    If you use the UCC28950 or UCC28951 output E and F can only be used to control SRs similar to what is shown in the typical application schematic in the data sheets.  If you are using a full bridge these outputs cannot be used for that application.  The reason is that during the freewheeling period Out E and Out F are both high.  The typical application in the UCC28950/1 data sheets is a center tapped transformer.

    Your output voltage is high.  In this application you might be better off using a none center tapped transformer and use a full bridge on the output.  You could use two half bridge drivers and use Out A and D signals to control the inputs of the half bridge driver.  

    Two UCC27714 half bridge drivers should work for this application.  The following link will get you to the data sheet for this half bridge driver.

    https://www.ti.com/lit/gpn/ucc27714

    Thank you for interest in Texas Instruments (TI) products.  If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

    Regards,