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TIDA-010933: How to develop the DC to AC converter logic for single phase totem pole PFC

Rahul Gandhi
Prodigy 80 points
Part Number: TIDA-010933

Tool/software:

Hi,

I am currently trying to simulate a bidirectional single phase totem pole PFC. I have been able to achieve the AC to DC conversion so far converting 240V AC to 400 DC.

I am trying to figure out the bidirectional capability of the PFC but I am unable to develop a control logic for that. Currently I am developing it without a microcontroller using Simulink block of PI controller. 

Can someone help me understand how will the PFC convert 400V DC to 240V AC, how do I control it and what are the switching diagrams in order to develop the DC to AC functionality of this converter.

Any reference material to read would also be helpful.

Regards,

Rahul Gandhi

  • 0
    TI__Intellectual 2810 points

    Hi Rahul,
    Basically the totem pole PFC is operating very similar to the syncronous boost converter but with the polarity.

    If you mirror the syncronous boost converter - you will find it as syncronous buck conveter. And the same happens for totem pole: it can boost power from 230V AC to 400V DC and it can buck power from 400V DC to 230V AC.

    So totem pole PFC become an totem pole inverter when you just chane the sign of the current.

    I hope this explanation is clear. If not - please tell me.

    Best regards, Seva.

  • 0 in reply to Vsevolod Elantsev4
    TI__Prodigy 80 points

    There will be a need to change the switching pattern of the mosfets based on the current direction right? How do I do that and what will the switching pattern be?

    Regards,

    Rahul Gandhi

  • +1 in reply to Rahul Gandhi
    TI__Intellectual 2810 points

    Hi Rahul,
    No change of switching pattern needed. 

    In the ideal boost converter if you keep duty cycle D = 1 - Vin/Vout there will be no current flow except ripple. If you increase duty cycle the current will become positive, flowing from input to output. If you decrease current duty cycle the current will become negative, going from output to input. 

    The same story in totem pole - you can control direction of the current by manipulating the duty cycle. 

    Best regards, Seva.

  • 0 in reply to Vsevolod Elantsev4
    TI__Prodigy 80 points

    Ok got it. Thanks a lot

    Regards,
    Rahul Gandhi