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UCC28180: 3phase PFC using ucc28180

vasudev mr
Prodigy 80 points
Part Number: UCC28180

Hi, 

I am designing a 3phase pfc.I am planing to use single boost converter which is followed by a 3 phase rectifier(I know that getting 3phase sinewave is not possible and THD will be 32%,its ok for me). Please refer the image for better understanding. will UCC28180 be able to get block shaped current ? To be more specific since the ripple frequency of current and voltage after rectification is 300HZ, does the pfc loop have the required bandwidth to shape the current ?  

  • +1
    TI__Mastermind 31310 points

    Hello Vasudev, 

    Thank you for your question on operating UCC28180 from rectified 3-phase voltage.  

    Yes, each phase current will resemble the simulated waveform in Red, except that the upper part of the "block-shaped" current will have upward-going humps instead of down-ward sagging valleys.  

    If you can guarantee balanced 3-phase input voltage all the time and the simulated current shape is acceptable, then you can also increase the bandwidth of the voltage loop.
    But I suggest to consider that if any one phase of the 2-phase input is lost, the system effectively reverts to a single phase input and the distortion will be much more severe with wide bandwidth.  So I suggest to consider retaining the low-BW design practice to maintain low THD if case one input phase is lost. 

    Regards,
    Ulrich.