TIDUES0E June   2019  – April 2024 TMS320F28P550SG , TMS320F28P550SJ , TMS320F28P559SG-Q1 , TMS320F28P559SJ-Q1

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Highlighted Products
      1. 2.2.1  UCC21710
      2. 2.2.2  UCC14141-Q1
      3. 2.2.3  AMC1311
      4. 2.2.4  AMC1302
      5. 2.2.5  OPA320
      6. 2.2.6  AMC1306M05
      7. 2.2.7  AMC1336
      8. 2.2.8  TMCS1133
      9. 2.2.9  TMS320F280039C
      10. 2.2.10 TLVM13620
      11. 2.2.11 ISOW1044
      12. 2.2.12 TPS2640
    3. 2.3 System Design Theory
      1. 2.3.1 Dual Active Bridge Analogy With Power Systems
      2. 2.3.2 Dual-Active Bridge – Switching Sequence
      3. 2.3.3 Dual-Active Bridge – Zero Voltage Switching (ZVS)
      4. 2.3.4 Dual-Active Bridge - Design Considerations
        1. 2.3.4.1 Leakage Inductor
        2. 2.3.4.2 Soft Switching Range
        3. 2.3.4.3 Effect of Inductance on Current
        4. 2.3.4.4 Phase Shift
        5. 2.3.4.5 Capacitor Selection
          1. 2.3.4.5.1 DC-Blocking Capacitors
        6. 2.3.4.6 Switching Frequency
        7. 2.3.4.7 Transformer Selection
        8. 2.3.4.8 SiC MOSFET Selection
      5. 2.3.5 Loss Analysis
        1. 2.3.5.1 SiC MOSFET and Diode Losses
        2. 2.3.5.2 Transformer Losses
        3. 2.3.5.3 Inductor Losses
        4. 2.3.5.4 Gate Driver Losses
        5. 2.3.5.5 Efficiency
        6. 2.3.5.6 Thermal Considerations
  9. 3Circuit Description
    1. 3.1 Power Stage
    2. 3.2 DC Voltage Sensing
      1. 3.2.1 Primary DC Voltage Sensing
      2. 3.2.2 Secondary DC Voltage Sensing
        1. 3.2.2.1 Secondary Side Battery Voltage Sensing
    3. 3.3 Current Sensing
    4. 3.4 Power Architecture
      1. 3.4.1 Auxiliary Power Supply
      2. 3.4.2 Gate Driver Bias Power Supply
      3. 3.4.3 Isolated Power Supply for Sense Circuits
    5. 3.5 Gate Driver Circuit
    6. 3.6 Additional Circuitry
    7. 3.7 Simulation
      1. 3.7.1 Setup
      2. 3.7.2 Running Simulations
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Required Hardware and Software
      1. 4.1.1 Hardware
      2. 4.1.2 Software
        1. 4.1.2.1 Getting Started With Software
        2. 4.1.2.2 Pin Configuration
        3. 4.1.2.3 PWM Configuration
        4. 4.1.2.4 High-Resolution Phase Shift Configuration
        5. 4.1.2.5 ADC Configuration
        6. 4.1.2.6 ISR Structure
    2. 4.2 Test Setup
    3. 4.3 PowerSUITE GUI
    4. 4.4 LABs
      1. 4.4.1 Lab 1
      2. 4.4.2 Lab 2
      3. 4.4.3 Lab 3
      4. 4.4.4 Lab 4
      5. 4.4.5 Lab 5
      6. 4.4.6 Lab 6
      7. 4.4.7 Lab 7
    5. 4.5 Test Results
      1. 4.5.1 Closed-Loop Performance
  11. 5Design Files
    1. 5.1 Schematics
    2. 5.2 Bill of Materials
    3. 5.3 Altium Project
    4. 5.4 Gerber Files
    5. 5.5 Assembly Drawings
  12. 6Related Documentation
    1. 6.1 Trademarks
  13. 7Terminology
  14. 8About the Author
  15. 9Revision History

4.1.2.6 ISR Structure

The DAB project consists of two ISRs (ISR1 and ISR2) with ISR1 being the fastest and non-nestable ISR. ISR1 is reserved for the control loop and the PWM update. ISR1 is triggered by the PRIM_LEG1_PWM_BASE → EPWM_INT_TBCTR_U_CMPC event.

The following are the defines related to this ISR:

#define DAB_ISR1_PERIPHERAL_TRIG_BASE DAB_PRIM_LEG1_PWM_BASE
#define DAB_ISR1_TRIG INT_EPWM1
#define DAB_ISR1_PIE_GROUP INTERRUPT_ACK_GROUP3
#define DAB_ISR1_TRIG_CLA CLA_TRIGGER_EPWM1INT

ISR2 is triggered by CPU Timer INT which is initiated by an overflow on CPU timer. ISR2 runs the slew rate function for commanded references.

#define DAB_ISR2_TIMEBASE CLLLC_TASKC_CPUTIMER_BASE
#define DAB_ISR2_TRIG INT_TINT2

Additionally, CPU timers are used to trigger slow background tasks (these are not interrupt-driven but polled). "A" tasks are triggered at TASKA_FREQ, which is 100 Hz. The SFRA GUI must be called at this rate. One task, A1, is executed at this rate. "B" tasks are triggered at TASKB_FREQ, which is 10 Hz. These are used for some basic LED toggles and state machine items that are not timing-critical. Three tasks—B1, B2, and B3—are serviced by this.

Figure 4-6 illustrates the ISR software diagram.

Note: The EMAVG_RUN function is not used in the current software.
TIDA-010054 Software DiagramFigure 4-6 Software Diagram
Note: For extended phase shift control the variables DAB_pwmEPSAlphaPRef_pu, DAB_pwmEPSAlphaP_pu, DAB_pwmEPSAlphaSRef_pu, DAB_pwmEPSAlphaS_pu, DAB_pwmEPSPhaseShift_P1_P2_ticks, DAB_pwmEPSPhaseShift_P1_S1_ticks and DAB_pwmEPSPhaseShift_P1_S2_ticks are introduced. The functions DAB_calculatePWMPhaseShift ticks and DAB_HAL_ipdatePWMDutyPeriodPhaseShift() are modified accordingly.