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TMS320F28388D: Pwm Frequency Issue

ozn o.
Intellectual 280 points
Part Number: TMS320F28388D


Tool/software:

Hello,

I want to generate 50khz pwm using deadband and compementary for inverter control.

But I get 12.5khz with the following configuration. Can you help?

EPWM_TIME_BASE_PERIOD => 250

    EPWM_setClockPrescaler(EPWM1_BASE, EPWM_CLOCK_DIVIDER_4, EPWM_HSCLOCK_DIVIDER_4);

    EPWM_setTimeBasePeriod(EPWM1_BASE, EPWM_TIME_BASE_PERIOD);

    EPWM_setTimeBaseCounter(EPWM1_BASE, 0);

    EPWM_setTimeBaseCounterMode(EPWM1_BASE, EPWM_COUNTER_MODE_UP_DOWN);

    EPWM_disablePhaseShiftLoad(EPWM1_BASE);

    EPWM_setPhaseShift(EPWM1_BASE, 0);

    EPWM_setCounterCompareValue(EPWM1_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMPA_VAL);

    EPWM_setCounterCompareShadowLoadMode(EPWM1_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_ZERO);

    //EPWM_setCounterCompareValue(EPWM1_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMPA_VAL);

    EPWM_setCounterCompareShadowLoadMode(EPWM1_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);

    EPWM_setActionQualifierAction(EPWM1_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

    EPWM_setDeadBandDelayPolarity(EPWM1_BASE, EPWM_DB_FED, EPWM_DB_POLARITY_ACTIVE_LOW);

    EPWM_setDeadBandDelayMode(EPWM1_BASE, EPWM_DB_RED, true);

    EPWM_setRisingEdgeDelayCount(EPWM1_BASE, EPWM_RISING_EDGE_DEADBAND);

    EPWM_setDeadBandDelayMode(EPWM1_BASE, EPWM_DB_FED, true);

    EPWM_setFallingEdgeDelayCount(EPWM1_BASE, EPWM_FALLING_EDGE_DEADBAND);

    //EPWM2 Ayarlari

    EPWM_setClockPrescaler(EPWM2_BASE, EPWM_CLOCK_DIVIDER_4, EPWM_HSCLOCK_DIVIDER_4);

    EPWM_setTimeBasePeriod(EPWM2_BASE, EPWM_TIME_BASE_PERIOD);

    EPWM_setTimeBaseCounter(EPWM2_BASE, 0);

    EPWM_setTimeBaseCounterMode(EPWM2_BASE, EPWM_COUNTER_MODE_UP_DOWN);

    EPWM_disablePhaseShiftLoad(EPWM2_BASE);

    EPWM_setPhaseShift(EPWM2_BASE, 0);

    EPWM_setCounterCompareValue(EPWM2_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMPA_VAL);

    EPWM_setCounterCompareShadowLoadMode(EPWM2_BASE, EPWM_COUNTER_COMPARE_A, EPWM_COMP_LOAD_ON_CNTR_ZERO);

    //EPWM_setCounterCompareValue(EPWM2_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMPA_VAL);

    EPWM_setCounterCompareShadowLoadMode(EPWM2_BASE, EPWM_COUNTER_COMPARE_B, EPWM_COMP_LOAD_ON_CNTR_ZERO);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_A, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_ZERO);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_PERIOD);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_LOW, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPA);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_HIGH, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPA);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_UP_CMPB);

    EPWM_setActionQualifierAction(EPWM2_BASE, EPWM_AQ_OUTPUT_B, EPWM_AQ_OUTPUT_NO_CHANGE, EPWM_AQ_OUTPUT_ON_TIMEBASE_DOWN_CMPB);

    EPWM_setDeadBandDelayPolarity(EPWM2_BASE, EPWM_DB_FED, EPWM_DB_POLARITY_ACTIVE_LOW);

    EPWM_setDeadBandDelayMode(EPWM2_BASE, EPWM_DB_RED, true);

    EPWM_setRisingEdgeDelayCount(EPWM2_BASE, EPWM_RISING_EDGE_DEADBAND);

    EPWM_setDeadBandDelayMode(EPWM2_BASE, EPWM_DB_FED, true);

    EPWM_setFallingEdgeDelayCount(EPWM2_BASE, EPWM_FALLING_EDGE_DEADBAND);