SPRACY3 June   2021 TMS320F280023C , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280040C-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280048C-Q1 , TMS320F280049C , TMS320F280049C-Q1 , TMS320F28076 , TMS320F28379D , TMS320F28379D-Q1 , TMS320F28379S , TMS320F28386D , TMS320F28386D-Q1 , TMS320F28386S , TMS320F28386S-Q1 , TMS320F28388D , TMS320F28388S , TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DK-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Design Overview
  4. 3CLB Implementation
    1. 3.1 CLB Input Selection
    2. 3.2 Counter and FSM Configuration
    3. 3.3 CLB Output
    4. 3.4 Completed Design
  5. 4Normal Operation With CBC Protection Configuration
    1. 4.1 CBC Protection Configuration
    2. 4.2 Swapping EPWM Configurations During Zero Cross Point
  6. 5Other Considerations
    1. 5.1 Trip Sourced From CMPSS
    2. 5.2 Extend to 3 Phase Inverter
      1. 5.2.1 Input Selection
      2. 5.2.2 Output Selection
    3. 5.3 Achieve 2 Level Protection Scheme
  7. 6Test Results
  8. 7References

5.1 Trip Sourced From CMPSS

The example shown in Section 4 is the showcase for the trip signal from the GPIO, which refers to the output of the external comparator. Surely, the internal CMPSS can be used to trigger the trip signal. As for the normal operation for CBC protection, only the source of EPWM TRIP4 needs to be changed. For example, if using CMPSS1 high side comparator output for the trip source, the configurations of EPWM X-Bar should be changed as below.

    // Configure CMPSS1_CTRIPH as EPWM X-BAR TRIP 4 source
    XBAR_setEPWMMuxConfig(XBAR_TRIP4,XBAR_EPWM_MUX00_CMPSS1_CTRIPH);
    XBAR_enableEPWMMux(XBAR_TRIP4, XBAR_MUX00);

Note that active low is needed for the CMPSS1_CTRIPH, so the output of comparator CMP1H is inverted during the initialization.

    CMPSS_configHighComparator(CMPSS1_BASE, CMPSS_INSRC_DAC | CMPSS_INV_INVERTED);

Besides, the CLB X-BAR should reassign the output of CMP1H to AUXSIG0.

XBAR_setCLBMuxConfig(XBAR_AUXSIG0, XBAR_CLB_MUX00_CMPSS1_CTRIPH);

XBAR_enableCLBMux(XBAR_AUXSIG0, XBAR_MUX00);