• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 63 subscribers
  • Views 442 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.

UCC28065: interleaved PFC without inductor with auxiliary winding

Francis
Prodigy 90 points
Part Number: UCC28065
Other Parts Discussed in Thread: UCC28056,
Hello, I'm developing a PFC interleaved transition mode.

I know that some non-interleaved transition mode PFC controllers allow you to use an inductor without an auxiliary winding.
For example UCC28056 as also discussed in the SLUA920B application note.

I wanted to ask you if it is also possible to use inductors without auxiliary winding in interleaved transition mode PFCs.
This is really important for my company.

Do you have a controller to suggest?

In case the interleaved controllers do not have this function there are non-interleaved controllers 
with this function (such as UCC28056) which can however be synchronized with another controller of the same type
in order to obtain an interleaved ?

Thank you
  • 0
    TI__Guru* 86266 points

    Hello,

    I am reviewing your inquiry and will get back to you shortly.

    Regards,

  • +1 in reply to Mike O'
    TI__Guru* 86266 points

    Hello, 

    The UCC28056 was an invocative device has proprietary technology inside to control the CrM PFC without the use of the aux winding to sense zero current in the boost inductor.  

    The UCC28065 is a unique interleaved PFC controller on it's own.  It interleaves two CrM PFC pre-regulators that are frequency modulated with constant on time.  This topology does require an Aux winding on the transformers to detect zero current in the inductors to function correctly. 

    There is an option you could use current sense transformers in series with the boost inductors to sense the current.  You could then feed the outputs of the transformers to the ZCD pin to detect zero current.  However, this approach would require more components and will be more expensive than using aux windings of the boost inductors to detect ZCD.

    Regards,