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Phase shifted full bridge-220V, 5Kw output

A.S.Bhushan
Expert 1060 points
Other Parts Discussed in Thread: UCC28950

I have to design DC_DC converter as per below specifications.

Input: 175-320VDC.

Output: 220VDC.

Output power: 5000W

Can I go with Phase Shifted Full bridge topology or LLC?

Please suggest any reference design or IC or Circuit, Transformer and inductor..

 

  • 0
    TI__Mastermind 25570 points

    Hello A.S.

    Normally at this power level we would recommend either a Phase Shifted Full Bridge or a Full Bridge LLC. The advantage of the PSFB is that it can be designed to work efficiently over a much wider input / output voltage conversion range than the FB-LLC so for your application I'd recommend the PSFB.

    The best option for the controller is the UCC28950 - this device features drives for the four primary side switches and for the secondary side rectifier MOSFETs.

    The web page for this device includes anujmber of links to reference designs that you may  find useful http://www.ti.com/product/UCC28950/technicaldocuments

    The design review of a 2kW PSFB at https://www.ti.com/seclit/ml/slup348/slup348.pdf may also be of interest. This particular design uses a microcontroller as the controller rather than the UCC28950 but the power train considerations would be almost the same.

    I don't have any direct links to transformer or inductor designs so I'd recommend that you talk to your magnetics supply company.

    Please don't hesitate to post if you have any further queries.

    Regards

    Colin

  • 0 in reply to Colin Gillmor
    Expert 1060 points
    Hi Mr. Colin Gillmor,

    Thanks for your valuable reply.
    Can I use 28950 IC for BUCK BOOST applications?
    I mean, Vin: 175-320VDC, Output is 220VDC.
  • 0 in reply to Colin Gillmor
    Expert 1060 points
    Hi Mr. Colin Gillmor,

    Thanks for your valuable reply.
    I have used this 28950 to generate 24VDC, 40A from 200-350VDC input.
    Now my confusion is whether it will work Vin: 175-320VDC, Output is 220VDC, 5000W?
    Regards,

    A.S.Bhushan
  • 0 in reply to A.S.Bhushan
    TI__Mastermind 25570 points
    Hello A.S.

    The PSFB is derived from the Buck converter topology so its output voltage is Vout = D Vin and of course 0 % < D < 100%. This gets modified by the transformer turns ratio so that a duty cycle in the range 0 to 100% can generate a voltage greater or less than Vin. Vout = D * Vin * Ns/Np . So the turns ratio would be calculated to give you a duty cycle within the range 25% < D < 75%.

    I think this should clarify the matter - if not then please let me know

    Regards
    Colin