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TIDM-SOLARUINV: Bidirectional Functionality

Eric Din71
Prodigy 230 points
Part Number: TIDM-SOLARUINV
Other Parts Discussed in Thread: TIDM-HV-1PH-DCAC

Hi there, I am building a bidirectional grid-tied power supply/sink and came across the TIDM-SOLARUINV. I see that the design calls for diodes in the flyback converter, but I was wondering if bidirectional functionality could be built in with the addition of switches and gate drive control on the microcontroller.

Thanks.

  • 0
    TI__Guru** 109690 points
    Hi Eric,

    The appropriate expert on this topic is out and will be back this Thursday. You can expect feedback after this Thursday. I appreciate your patience.
  • 0
    TI__Genius 10995 points
    This is not the right design for your application. You need a bi-directional grid tie inverter/PFC stage followed by a bi-dir DC/DC stage. For the first one we have this design as ref:

    www.ti.com/.../TIDM-HV-1PH-DCAC

    This hardware has bi-dir switches (FB inverter) and has the software for grid-tie inverter application. However it does not have the s/w for the PFC application.

    For the second one pls see our bi-dir DC/DC ref design at:

    www.ti.com/.../TIDM-BIDIR-400-12

    Together these two designs will give you the reference for the bi-dir power supply you are planning to design.

    Shamim
  • 0 in reply to Shamim Choudhury
    Prodigy 230 points

    Hi Shamim,

    thank you for the quick response. I believe this gives us all the pieces we need. One more question on the inverter bridges: Apart from the LCL filter, for the solar inverter design I noticed that two switches are connected on the right side of the inductor together with diodes whereas in the other design both switch pairs are connected to the left side. Could you explain the reason behind this?

    Thank you for your help!

    -Eric

  • 0 in reply to Eric Din71
    TI__Mastermind 43730 points
    Eric,

    the TIDM-HV-1PH-DCAC is the conventional full bridge inverter.

    The SOLAR U INV uses a customized topology for benefit in the micro inverter market, but cannot provide bi-directional power flow. It has an advantage that the prim side converter can be non-isolated.

    See

    Highly Efficient Single-Phase Transformerless
    Inverters for Grid-Connected Photovoltaic Systems

    Samuel Vasconcelos Araújo, Student Member, IEEE, Peter Zacharias, Member, IEEE, and
    Regine Mallwitz, Member, IEEE

    IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS, VOL. 57, NO. 9, SEPTEMBER 2010