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TMDSDOCK28335: Implementation of wireless power transfer system using two C2000 MCUs

Kerui Li
Prodigy 150 points
Part Number: TMDSDOCK28335

Hi,

After reading the paper of "Exploring the evolution and optimization of wireless power transfer", I am interested in how the PWM synchronization between two C2000 MCU is achieved in the wireless power transfer system. 

May I know more about the detail implementation of the wireless power transfer system as illustrated in the paper of "Exploring the evolution and optimization of wireless power transfer". Is it possible for me to have a tutorial ? 

  • 0
    TI__Mastermind 41415 points

    Kerui,

    you can use EPWMSYNCI and EPWMSYNCO. These pins allow the device's PWMs to synchronize to the outside world.

    The pin options for these signals are described in the datasheet. EPWMSYNCI is bought in to EPWM1, and that information is covered in the Technical Reference Manual.

    Please note there is a different delay when taking signals into the device. It is deterministic, can be compensated for in the TBPHS register, and is documented on this forum. If I remember correctly its approximately 7 cycles.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 150 points

    Dear Cody,

    Thank you for your reply. I have another questions on the synchronization signal.

    In the paper, two C2000 MCUs are wirelessly communicated so the  synchronization signal is transmitted wirelessly. May I know how to implement the wireless transmission of  synchronization signal?

    Regards

    Kerui

  • 0 in reply to Kerui Li
    TI__Mastermind 41415 points

    Kerui,

    I now understand your question. The PWM signals are not nessassarly in phase across the WPT gap. The controller on the transmitter side is going to be in phase with everything on the TX side, but the RX side will be independednt. There is of course a wireless bridge where data like frequency, currents and other data could be transferred, but this would not be used for phase synchronization of the PWMs on the RX and TX sides of the WPT.

    Regards,
    Cody

  • 0 in reply to Cody Watkins
    Prodigy 150 points

    Dear Cody,

    Thanks for your reply. 

    The proposed solution in your paper uses active full bridge inverter/rectifiers on both Tx and Rx, which suggests that the PWMs on RX and TX are synchronized. If they are not synchronized, the phase/frequency difference between PWMs will adversely affect the operation. So it is necessary to have synchronization between them.

    I am wondering how to realize the synchronization of PWMs between Rx and Tx? Or the proposed solution in your paper does not consider this issue?

    Regards
    Kerui

  • 0 in reply to Kerui Li
    TI__Mastermind 41415 points

    Kerui,

    sorry that was my take away from a quick read of the appnote. I will contact the author and get back to you.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    TI__Mastermind 41415 points

    Kerui,

    there is an ongoing discussion for this topic. I will report back what comes out of that.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    TI__Mastermind 41415 points

    Kerui,

    https://www.mdpi.com/2079-9292/7/11/319/pdf

    The above paper is the synchronizing solution that we would suggest. This was done on an older F28335 device. When using something more modern like an F28004x device you should be able to bring the comparitor circuitry into the device saving some cost.

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 150 points

    Dear Cody,

    Sorry for the late reply. It takes me two days to understand the paper. 

    Though the solution in the paper is effective, I am still wondering if the MCUs can synchronize with each other via wireless communication? For example,  the master MCU sends out a synchronization signal via a wireless communication protocol. Then the salve MCU receives the wireless communication signals and use the signal to synchronize with the master MCU. Is this possible?

    Regards

    Kerui 

  • 0 in reply to Kerui Li
    TI__Mastermind 41415 points

    Kerui,

    I believe the proposed solution should work for a WPT system. If you really want to use a wireless communication protocol for synchronization I too believe this is possible in theory. To the best of my knowledge we do not have an example of how to do that, and have not developed a system using such a technique. That being said I don't see why it wouldn't work as long as you can develop a reasonable synchronization resolution across the wireless communication. 

    Regards,
    Cody

  • 0 in reply to Cody Watkins
    Prodigy 150 points

    Dear Cody

    Thank you so much.

    Regards

    Kerui