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Bridgeless PFC,EMI performance

John2012
Intellectual 585 points
Other Parts Discussed in Thread: UCC28070

Hello,

 

TI has a Bridgeless 2 phase interleaved PFC kit, how is its EMI performance if compared with another TI kit:2 phase interleaved PFC?

Need to see if the bridgeless one does cause higher EMI in order to select one of them.

Thanks a lot,

 

 

  • 0
    TI__Guru* 86106 points

    There is a 2 phase interleave PFC pre-regulator evaluation board using the UCC28070.  The semi-bridge less PFC was an application note on how to design PFC pre-regulator.  Neither of these were designed to meet EMI requirements.  That being said we don't have EMI data on either.

    You could order a UCC28070 interleaved EVM and measure the EMI and then modify it for semi-bridge less PFC and measure the EMI. When it comes to EMI the semi-bridge less should be the same as a single phase.  When it comes to peak EMI I am guessing that they are probably about the same. Interleaved will operate at 2X the switching frequency and the noise spikes will have half the energy compared to the semi-bridgeless PFC.  If you do take this data could you post in the forum so everyone can see it?  I am interested to see what it is.  

    For interleaved PFC this is a 300W PFC pre-regulator and for semi-bridge less PFC it is a 150W design.  That being said semi-bridge less PFC has a lower power density than interleaved PFC.  Based on the size of the power stage, I would chose interleave PFC over semi bridge-less PFC.

    Regards,

     

  • 0 in reply to Mike O'
    Intellectual 585 points

    Hi Mike,

     

    Thank you so much for the information,it is quite useful.I would try it and post the results as you suggested, it is quite interesting.

    I do have more questions though:

    1)UCC28070 is analog control , I'd like to try using digital control and TI has one by 28027.  I suppose they are exactly the same in terms of power base board, the only differnce is just the controller, right?

    2)Does TI have a ZVS PFC kit?

     

    Thank you very much,