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SolarHv_DCAC output wave modifications

Peter Stolt
Prodigy 50 points


I have a Transphorm PV Inverter 1 phase bridge eval board (TDPV1000E0C1) and would like to make some modifications to the output wave shape. It looks like the shape of the output wave is defined in the array wSinTab in the SolarHv_DCAC-main.c file starting at line 374.  Can these values be changed to shape the output wave to something other than a sine wave?

I'll also need to change the output wave frequency.  Would this be done in the GEN_SIN_COS block by changing the dwPll_Trace_Freq value?

Thanks!

  • 0
    TI__Mastermind 43730 points
    Peter,

    As we are a programmable solution, everything is controlled by the code you are referring to and can be changed and experimented with.

    That being said, for a different waveform the solution may or may not work depending on the bandwidth and margins available in the control loop.. Which may require some additional changes to the output.

    Additionally we have another design whose code is completely in C and easy to follow, in case you want to refer to it for understanding.

    www.ti.com/.../TIDM-HV-1PH-DCAC
  • 0 in reply to Manish Bhardwaj
    Prodigy 50 points
    Thank you for the information. Does the wSinTab array that I mentioned have any impact on the output wave form?
  • 0 in reply to Peter Stolt
    TI__Mastermind 43730 points
    Peter,

    wSinTab is not being used in the code,

    if you look at the UG the Fig 3.5, 3.6 and 3.8 the table is not being used, instead a block called gen sin cos is used which does not use this table.

    Actually this is remnant of some code that we had put to support UPS style output i.e. controller output voltage but it was never supported for this design, the only reference to the variable is commented out in the ISR.asm file.

    For UPS code i would recommend the design i pointed to earlier,