• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 65 subscribers
  • Views 814 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

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.

3,500W pfc with 240VAC +/- 10% input, 390VDC output

adam cohen1
Prodigy 20 points
Other Parts Discussed in Thread: UCC2818A, UCC28070, UCC28063, UCC28060, UCC28950, UCC3895

we are selecting a pfc front end circuit to our volt-hertz 3 phase 3,500W ac drive.  the input is NOT universal but 240VAC +/- 10% single phase, and we would like an output of around 385VDC.  Could someone recommend the best topology for this, single, interleaved or bridgeless.  If interleaved is the way to go, could you recommend a boosting inductor value (along with current handling capacity) and a switching frequency that would work?  The design spread sheet that TI offers is for universal input, down to 85VAC, which puts an extra burden on the design.  Ideally, if someone could direct me to a successful design of such a circuit it would be very appreciated.  thank you.

  • 0
    TI__Mastermind 25130 points

    Adam,

    If you have a 3 phase line powering this design you can not use a single PFC unit to achieve your objective.

    Please review the paper linked here and advise how you want to proceed.

    http://eetimes.com/design/power-management-design/4009948/Design-considerations-for-three-phase-power-factor-correction-item-1 

    Please note that the outputs of each of the PFC units are isolated from each other and cannot be directly connected in parallel. They also are not isolated from the incoming line. In fact they follow the most negative voltag on their inputs.

    Regards,

    John

     

  • 0 in reply to John Bottrill
    Prodigy 20 points

    Hi John, thanks for your suggestion, however, the input is a single phase 240VAC, 3,500W capacity.  TI offers over 70 pfc chips with different topologies.  There is probably a preferred TI chip and topology for this requirement, as well as a sample design that is close.  That's pretty much what I am looking for.  Is a single inductor approach out of the question for this power level? 

  • 0 in reply to adam cohen1
    TI__Mastermind 25130 points

    Adam,

    We have customers that use single PFC solutions with the UCC2818A at those power levels. You can also use a UCC28070 which is an interleaved PFC with 2 PFC chokes and power switches.

    Your design engineer will have to make the choices based on your requirements and costs.

    There are sample designs for each at lower power levels in a standard configuration that your TI representative may be able to get for you.

    There are possibly other designs that may more closely match your needs in ELAB which again the local rep may be able to help you with.

    Regards,

    John

  • 0 in reply to John Bottrill
    Intellectual 310 points

    Dear ;

    I need a similar PFC stage (3KW from single phase 240Vac)

    I was thinking on the UCC28063 and  UCC28060 , in favor of the UCC28070

    The UCC28070 seems to need an extra current transfo to sense the mosfet drain current.
    I think the interleaving pfc's are the best option for these high power levels

    (I am a bit allergic to many inductive components in a design...)

    I finally need 3KV DC@ 1A and load could go from 0 to 100% (1A@3KVDC) for that i would use an UCC28950  

    (maybe UCC3895 would be enough since i don't need a synchr rectifier)

    Please comment on IC selection