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CCS/TMS320F28379D: TIDM 1000: Where to see the 3 phase pwm with 120 degree phase shift in epwm

Avi P
Expert 1100 points
Part Number: TMS320F28379D
Other Parts Discussed in Thread: TIDM-1000

Tool/software: Code Composer Studio

Hello TI

 I am looking at the "TMS320x2834x Delfino Enhanced Pulse Width Modulator (ePWM) Module" Reference guide, I have referred to the example of EPWM which are 120-degree phase-shifted, Here you can see the screenshot,

I am trying to relate it with the Vienna TIDM 1000 but here TBPHS is 2, what is TBPRD for Vienna? I am trying to find in all files but couldn't find it can you please tell me (like inv PWM no and all)

  • 0
    TI__Genius 15935 points

    Hi Avi,

    Sorry for the late reply. 

    In TIDM-1000, the duty cycle of three phases are different and are calculated based on the code below. The PWM counter does not have 120 phase shift.

    VIENNA_duty1PU = ( (VIENNA_gi_out1
    + VIENNA_inductor_voltage_drop_feedforward1
    + VIENNA_v1Meas_pu
    - VIENNA_thirdHarmonicInjection
    ) / VIENNA_vBusHalfMeas_pu ) - VIENNA_gs_out;

    VIENNA_duty2PU = ( (VIENNA_gi_out2
    + VIENNA_inductor_voltage_drop_feedforward2
    + VIENNA_v2Meas_pu
    - VIENNA_thirdHarmonicInjection
    ) / VIENNA_vBusHalfMeas_pu ) - VIENNA_gs_out;


    VIENNA_duty3PU = ( (VIENNA_gi_out3
    + VIENNA_inductor_voltage_drop_feedforward3
    + VIENNA_v3Meas_pu
    - VIENNA_thirdHarmonicInjection
    ) / VIENNA_vBusHalfMeas_pu ) - VIENNA_gs_out;