TIDUFD2A May   2025  – October 2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Input Capacitors Selection
      2. 2.2.2 DC Side
      3. 2.2.3 AC Side
    3. 2.3 Highlighted Products
      1. 2.3.1 TMDSCNCD28P55X - controlCARD Evaluation Module
        1. 2.3.1.1 Hardware Features
        2. 2.3.1.2 Software Features
      2. 2.3.2 LMG2104R022
      3. 2.3.3 AMC3302
      4. 2.3.4 UCC21550A
      5. 2.3.5 TMCS1133 - Precision 1MHz Hall-Effect Current Sensor With Reinforced Isolation
      6. 2.3.6 INA185 - 26V, 350kHz, Bidirectional, High-Precision Current Sense Amplifier
      7. 2.3.7 LM5164 – 100V Input, 1A Synchronous Buck DC-DC Converter With Ultra-Low IQ
      8. 2.3.8 UCC34141-Q1
  9. 3System Design Theory
    1. 3.1 Isolation for Solar Inverters
    2. 3.2 Topology Overview
    3. 3.3 Control Theory
      1. 3.3.1 Single and Extended Phase Shift Modulation Technique
      2. 3.3.2 Zero Voltage Switching and Circulating Current
      3. 3.3.3 Optimized Control Method
      4. 3.3.4 Dead-Time Compensation
      5. 3.3.5 Frequency Modulation
      6. 3.3.6 Controller Block Diagram
    4. 3.4 MPPT and Input Voltage Ripple
  10. 4Hardware, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Board Check
      2. 4.3.2 DC-DC Tests
      3. 4.3.3 DC-AC Tests
      4. 4.3.4 AC-DC Tests
      5. 4.3.5 DC-AC Offgrid Tests
    4. 4.4 Test Results
      1. 4.4.1 Efficiency and iTHD
      2. 4.4.2 Operating Waveforms for Various Loads
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
  12. 6About the Author
  13. 7Revision History

4.3.1 Board Check

Figure 4-1 shows the board connections.

TIDA-010954 Board Connections for Low-Voltage TestsFigure 4-1 Board Connections for Low-Voltage Tests

The test sequence follows:

  1. Connect the negative terminal of the differential probe to TP13 and the positive terminal to TP10. Connect the second differential probe to TP27 and TP12, respectively. Connect the Rogowski coil around transformer T1 secondary side wire
  2. Set CYCLO_LAB define in cinv_settings.h to 1
  3. Build and download firmware to the controller and run
  4. Import the <DPSDK>\solutions\tida_010954\source\debug\lab1.txt file to the expressions view
  5. Set following variables cyclo_iref_g = 0.0, cyclo_d1 = 0.47, cyclo_d2 = 0.0
  6. Set cyclo_run = 1, observe that cyclo_started become 1
  7. Observe the oscilloscope waveforms. The primary side needs to have clean, 3 level waveforms with narrow positive and negative pulses. The secondary side needs to have 2 level waveforms, the current needs to have triangular waveforms