TIDUF64C December   2023  – July 2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
    2. 1.2 PV Input With Boost Converter
    3. 1.3 Bidirectional DC/DC Converter
    4. 1.4 DC/AC Converter
  8. 2System Design Theory
    1. 2.1 Boost Converter
      1. 2.1.1 Inductor Design
      2. 2.1.2 Rectifier Diode Selection
      3. 2.1.3 MPPT Operation
    2. 2.2 Bidirectional DC/DC Converter
      1. 2.2.1 Inductor Design
      2. 2.2.2 Low-Voltage Side Capacitor
      3. 2.2.3 High-Voltage Side Capacitor
    3. 2.3 DC/AC Converter
      1. 2.3.1 Boost Inductor Design
      2. 2.3.2 DC-Link Capacitor
  9. 3System Overview
    1. 3.1 Block Diagram
    2. 3.2 Design Considerations
      1. 3.2.1 Boost Converter
        1. 3.2.1.1 High-Frequency FETs
        2. 3.2.1.2 Input Voltage and Current Sense
      2. 3.2.2 Bidirectional DC/DC Converter
        1. 3.2.2.1 High-Frequency FETs
        2. 3.2.2.2 Current and Voltage Measurement
        3. 3.2.2.3 Input Relay
      3. 3.2.3 DC/AC Converter
        1. 3.2.3.1 High-Frequency FETs
        2. 3.2.3.2 Current Measurements
        3. 3.2.3.3 Voltage Measurements
        4. 3.2.3.4 Auxiliary Power Supply
        5. 3.2.3.5 Passive Components Selection
    3. 3.3 Highlighted Products
      1. 3.3.1  TMDSCNCD28P55X - controlCARD Evaluation Module
      2. 3.3.2  TMDSCNCD280039C - TMS320F280039C Evaluation Module C2000™ MCU controlCARD™
      3. 3.3.3  LMG3522R030 650-V 30-mΩ GaN FET With Integrated Driver, Protection and Temperature Reporting
      4. 3.3.4  TMCS1123 - Precision Hall-Effect Current Sensor
      5. 3.3.5  AMC1302 - Precision, ±50-mV Input, Reinforced Isolated Amplifier
      6. 3.3.6  ISO7741 Robust EMC, Quad-channel, 3 Forward, 1 Reverse, Reinforced Digital Isolator
      7. 3.3.7  ISO7762 Robust EMC, Six-Channel, 4 Forward, 2 Reverse, Reinforced Digital Isolator
      8. 3.3.8  UCC14131-Q1 Automotive, 1.5-W, 12-V to 15-V VIN, 12-V to 15-V VOUT, High-Density > 5-kVRMS Isolated DC/DC Module
      9. 3.3.9  ISOW1044 Low-Emissions, 5-kVRMS Isolated CAN FD Transceiver With Integrated DC/DC Power
      10. 3.3.10 ISOW1412 Low-Emissions, 500kbps, Reinforced Isolated RS-485, RS-422 Transceiver With Integrated Power
      11. 3.3.11 OPA4388 Quad, 10-MHz, CMOS, Zero-Drift, Zero-Crossover, True RRIO Precision Operational Amplifier
      12. 3.3.12 OPA2388 Dual, 10-MHz, CMOS, Zero-Drift, Zero-Crossover, True RRIO Precision Operational Amplifier
      13. 3.3.13 INA181 26-V Bidirectional 350-kHz Current-Sense Amplifier
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Additional Hardware Recommendations
    2. 4.2 Test Setup
      1. 4.2.1 Boost Stage
      2. 4.2.2 Bidirectional DC/DC Stage
        1. 4.2.2.1 Buck Mode
        2. 4.2.2.2 Boost Mode
      3. 4.2.3 DC/AC Stage
    3. 4.3 Test Results
      1. 4.3.1 Boost Converter
        1. 4.3.1.1 Switching Node Waveform
        2. 4.3.1.2 Efficiency Measurement
        3. 4.3.1.3 GaN Junction Temperature Measurement
      2. 4.3.2 Bidirectional DC/DC Converter
        1. 4.3.2.1 Buck Mode
          1. 4.3.2.1.1 Efficiency Measurement
          2. 4.3.2.1.2 GaN Junction Temperature Measurement
        2. 4.3.2.2 Boost Mode
          1. 4.3.2.2.1 Efficiency Measurement
          2. 4.3.2.2.2 Switching Node Waveform
          3. 4.3.2.2.3 GaN Junction Temperature Measurement
      3. 4.3.3 DC/AC Converter
        1. 4.3.3.1 Efficiency Measurements
        2. 4.3.3.2 Switching Node Waveforms
        3. 4.3.3.3 Total Harmonic Distortion Comparison
        4. 4.3.3.4 GaN Junction Temperature Measurements
        5. 4.3.3.5 Reactive Power Capability
        6. 4.3.3.6 Anti-islanding
  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 Authors
  13. 7Revision History

4.3.3.1 Efficiency Measurements

Figure 4-3 and Table 4-4 show the overall efficiency converting from DC Bus to 230VAC output. The results are discussed for comparison of all three modulation schemes, H-Bridge in unipolar, H-Bridge in bipolar and HERIC modes.

The table shows that the reference design in H-Bridge Unipolar mode achieves a ηpeak = 98.2% at approximately 2.9kW and 400V input, ηfull-load of 98.0% and ηCEC = 97.9% .

The table shows that the reference design in H-Bridge Bipolar mode achieves a ηpeak = 98.0% at approximately 2.8kW and 400V input, ηfull-load of 97.7% and ηCEC = 97.8%.

The table shows that the reference design in HERIC mode achieves ηpeak = 98.4% at approximately 2.1kW and 400V input, ηfull-load of 98.2% and ηCEC = 98.3%.

TIDA-010938 DC/AC Efficiency Comparison Figure 4-16 DC/AC Efficiency Comparison
Table 4-4 DC/AC Efficiency
OUTPUT POWER EFFICIENCY FOR

H-BRIDGE UNIPOLAR

 OUTPUT POWER EFFICIENCY FOR

H-BRIDGE BIPOLAR

 OUTPUT POWER EFFICIENCY FOR

HERIC
0.3kW 94.1% 0.3kW 95.2% 0.4kW 96.6%
0.5kW 95.6% 0.5kW 96.2% 0.5kW 97.3%
0.7kW 96.5% 0.7kW 96.8% 0.7kW 97.7%
0.9kW 97.0% 1.0kW 97.4% 0.9kW 98.0%
1.0kW 97.2% 1.4kW 97.6% 1.2kW 98.2%
1.4kW 97.8% 1.8kW 97.8% 1.4kW 98.3%
1.8kW 97.9% 2.1kW 97.9% 1.8kW 98.4%
2.1kW 98.0% 2.3kW 97.9% 2.1kW 98.4%
2.3kW 98.1% 2.5kW 97.9% 2.3kW 98.4%
2.5kW 98.1% 2.8kW 98.0% 2.5kW 98.4%
2.7kW 98.1% 3.2kW 97.9% 2.8kW 98.4%
2.9kW 98.2% 3.4kW 97.9% 3.0kW 98.4%
3.0kW 98.2% 3.8kW 97.9% 3.2kW 98.4%
3.2kW 98.2% 3.9kW 97.9% 3.4kW 98.3%

3.4kW

 98.2%

4.1kW

 97.8% 3.6kW 98.3%

3.6kW

 98.2%

4.3kW

 97.8% 3.8kW 98.3%
3.8kW 98.1%

4.4kW

 97.8% 3.9kW 98.3%
3.9kW 98.1%

4.6kW

 97.7%

4.1kW

 98.2%

4.1kW

 98.1%

4.3kW

 98.2%

4.3kW

 98.1%

4.4kW

 98.2%

4.4kW

 98.0%

4.5kW

 98.1%

4.6kW

 98.0%