TIDUFG9 December   2025

 

  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 Design Considerations
      1. 2.2.1 Switching Pattern of a 3-Level Flying Capacitor Switching Cell
      2. 2.2.2 Power Switching Devices Selection and Cooling Approach
      3. 2.2.3 Boost Inductor Selection
      4. 2.2.4 Flying Capacitor Selection
      5. 2.2.5 Cx Capacitance Selection
      6. 2.2.6 DC-Link Output Capacitance Selection
    3. 2.3 Highlighted Products
      1. 2.3.1 LMG3522R030 - 650V, 30mΩ GaN FET With Integrated Driver
      2. 2.3.2 TMDSCNCD28P55X - controlCARD Evaluation Module
        1. 2.3.2.1 Hardware Features
        2. 2.3.2.2 Software Features
      3. 2.3.3 TMCS1126 - Precision 500kHz Hall-Effect Current Sensor With Reinforced Isolation
      4. 2.3.4 UCC33421-Q1 Ultra-Small, 1.5W, 5.0V, 5kVRMS Isolation, DC/DC Module
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 Testing TIDA-010957 Connected to the Grid With DC-Link
    3. 3.3 Test Results
      1. 3.3.1 Testing TIDA-010957 Connected to the Grid With DC-Link: Balanced Currents
        1. 3.3.1.1 Nominal Apparent Power
        2. 3.3.1.2 Efficiency vs Power vs DC-Link Voltage
          1. 3.3.1.2.1 Testing the Converter at 700VDC at 400VAC
          2. 3.3.1.2.2 Testing the Converter at 800VDC at 400VAC
          3. 3.3.1.2.3 Testing the Converter at 900VDC at 400VAC
          4. 3.3.1.2.4 Testing the Converter at 800VDC at 480VAC
      2. 3.3.2 Testing TIDA-010957 Tied to the Grid With DC-Link: Unbalance Currents
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Documentation Support
    3. 4.3 Support Resources
    4. 4.4 Trademarks
  11. 5About the Author

3.3.1.1 Nominal Apparent Power

In these tests, nominal apparent power occurred when the DC link voltage reached 700VDC and the grid voltage reached 400VAC. The converter connects to the grid by controlling the three currents. The currents achieved full four-quadrant operation including: inverter, Power Factor Corrector (PFC), inductive compensator and capacitive compensator. The experimental results appear in Figure 3-2 through Figure 3-8. During the experiments, no significant zero crossing distortion appeared in the currents. The total harmonic distortion at nominal power remained below 3%. Furthermore, note that no significant current ripple enters the grid

TIDA-010957 Experimental PFC Operation: Line Current and Line Voltage (Figure A)Figure 3-2 Experimental PFC Operation: Line Current and Line Voltage (Figure A)

TIDA-010957 Experimental PFC Operation: Switching Node Voltage (Figure B)

Figure 3-3 Experimental PFC Operation: Switching Node Voltage (Figure B)
TIDA-010957 Experimental Inverter Operation: Line Current and Line Voltage (Figure A)Figure 3-4 Experimental Inverter Operation: Line Current and Line Voltage (Figure A)

TIDA-010957 Experimental Inverter Operation: Switching Node Voltage (Figure B)

Figure 3-5 Experimental Inverter Operation: Switching Node Voltage (Figure B)
TIDA-010957 Experimental Inverter Plus Capacitive Compensation: Line Current and Line Voltage(Figure A)Figure 3-6 Experimental Inverter Plus Capacitive Compensation: Line Current and Line Voltage
(Figure A)

TIDA-010957 Experimental Inverter Plus Capacitive Compensation: Switching Node Voltage (Figure B)

Figure 3-7 Experimental Inverter Plus Capacitive Compensation: Switching Node Voltage (Figure B)
TIDA-010957 Experimental Inverter Plus Inductive Compensation: Line Current and Line Voltage(Figure A)Figure 3-8 Experimental Inverter Plus Inductive Compensation: Line Current and Line Voltage
(Figure A)

TIDA-010957 Experimental Inverter Plus Inductive Compensation: Switching Node Voltage (Figure B)

Figure 3-9 Experimental Inverter Plus Inductive Compensation: Switching Node Voltage (Figure B)