TIDUF64 December   2023

 

  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 DC-DC Boost Converter
      2. 2.2.2 Bidirectional DC-DC Converter
      3. 2.2.3 DC-AC Converter
    3. 2.3 Highlighted Products
      1. 2.3.1  TMDSCNCD280039C - TMS320F280039C Evaluation Module C2000™ MCU controlCARD™
      2. 2.3.2  LMG3522R030 650-V 30-mΩ GaN FET With Integrated Driver, Protection and Temperature Reporting
      3. 2.3.3  TMCS1123 - Precision Hall-Effect Current Sensor
      4. 2.3.4  AMC1302 - Precision, ±50-mV Input, Reinforced Isolated Amplifier
      5. 2.3.5  ISO7741 Robust EMC, Quad-channel, 3 Forward, 1 Reverse, Reinforced Digital Isolator
      6. 2.3.6  ISO7762 Robust EMC, Six-Channel, 4 Forward, 2 Reverse, Reinforced Digital Isolator
      7. 2.3.7  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
      8. 2.3.8  ISOW1044 Low-Emissions, 5-kVRMS Isolated CAN FD Transceiver With Integrated DC/DC Power
      9. 2.3.9  ISOW1412 Low-Emissions, 500kbps, Reinforced Isolated RS-485, RS-422 Transceiver With Integrated Power
      10. 2.3.10 OPA4388 Quad, 10-MHz, CMOS, Zero-Drift, Zero-Crossover, True RRIO Precision Operational Amplifier
      11. 2.3.11 OPA2388 Dual, 10-MHz, CMOS, Zero-Drift, Zero-Crossover, True RRIO Precision Operational Amplifier
      12. 2.3.12 INA181 26-V Bidirectional 350-kHz Current-Sense Amplifier
  9. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Hardware Requirements
    2. 3.2 Test Setup
      1. 3.2.1 DC-DC Boost Stage
      2. 3.2.2 Bidirectional DC-DC Stage
    3. 3.3 Test Results
      1. 3.3.1 DC-DC Boost Converter
      2. 3.3.2 Bidirectional DC-DC Converter
  10. 4Design and Documentation Support
    1. 4.1 Design Files
      1. 4.1.1 Schematics
      2. 4.1.2 BOM
    2. 4.2 Tools and Software
    3. 4.3 Documentation Support
    4. 4.4 Support Resources
    5. 4.5 Trademarks
  11. 5About the Author

3.3.2 Bidirectional DC-DC Converter

Figure 3-4 and Table 3-2 show the efficiency of the bidirectional DC-DC converter functioning in buck mode at 400-V DC bus output. The input battery voltages considered are 80 V, 160 V, 240 V, and 320 V and the table shows that the converter achieves peak efficiencies of 97.9%, 99.0%, 99.2%, and 99.4% respectively.

GUID-20231206-SS0I-L0DB-DDJB-V1M4VR1F3CN5-low.svg Figure 3-4 Bidirectional DC-DC Efficiency vs Output Power at 400-V DC-Link
Table 3-2 Bidirectional DC-DC Efficiency
OUTPUT POWER EFFICIENCY AT VBat = 80 V OUTPUT POWER EFFICIENCY AT VBat = 160 V OUTPUT POWER EFFICIENCY AT VBat = 240 V OUTPUT POWER EFFICIENCY AT VBat = 320 V

0.2 kW

97.9%

0.4 kW

98.5%

0.4 kW

98.5%

1.0 kW

99.4%

0.3 kW

97.9%

0.7 kW

98.8%

0.8 kW

99.1%

1.8 kW

99.3%

0.5 kW

97.4%

1.1 kW

98.9%

1.3 kW

99.1%

2.4 kW

99.3%

0.7 kW

97.6%

1.4 kW

99.0%

1.8 kW

99.2%

3.1 kW

99.4%

0.9 kW

97.7%

1.7 kW

98.9%

2.3 kW

99.2%

3.7 kW

99.4%

1.0 kW

97.9%

2.0 kW

98.8%

2.8 kW

99.2%

4.3 kW

99.4%

1.2 kW

97.9%

2.3 kW

98.8%

3.2 kW

99.2%

5.1 kW

99.4%

1.4 kW

97.9%

2.7 kW

98.8%

3.8 kW

99.2%

5.7 kW

99.4%

1.5 kW

97.9%

3.0 kW

98.8%

4.3 kW

99.2%

6.4 kW

99.3%

1.7 kW

97.8%

3.4 kW

98.8%

4.8 kW

99.1%

7.0 kW

99.3%

1.9 kW

97.7%

3.7 kW

98.7%

5.3 kW

99.1%

7.3 kW

99.3%

2.0 kW

97.6%

4.0 kW

98.7%

5.7 kW

99.0%

2.2 kW

97.6%

4.4 kW

98.6%

6.3 kW

99.0%

2.4 kW

97.4%

4.7 kW

98.5%

6.8 kW

98.9%

Figure 3-5 and Table 3-3 further show the efficiency of this converter versus output current at 400-V DC bus to demonstrate the capability in handling currents up to 30 A.

GUID-20231206-SS0I-P0MF-NQ53-MBPVDPXTBJ5C-low.svg Figure 3-5 Bidirectional DC-DC Converter Efficiency vs Output Current at 400-V DC-Link
Table 3-3 Bidirectional DC-DC Converter
OUTPUT CURRENT EFFICIENCY AT VBat = 80 V OUTPUT CURRENT EFFICIENCY AT VBat = 160 V OUTPUT CURRENT EFFICIENCY AT VBat = 240 V OUTPUT CURRENT VBat = 320 V
2.5 A

97.9%

2.5 A

98.5%

1.5 A

98.5%

3.1 A

99.4%

4.1 A

97.9%

4.2 A

98.8%

3.2 A

99.1%

5.6 A

99.3%

6.5 A

97.4%

6.6 A

98.9%

5.6 A

99.1%

7.5 A

99.3%

8.5 A

97.6%

8.6 A

99.0%

7.6 A

99.2%

9.6 A

99.4%

10.6 A

97.7%

10.6 A

98.9%

9.7 A

99.2%

11.7 A

99.4%

12.6 A

97.9%

12.7 A

98.8%

11.7 A

99.2%

13.3 A

99.4%

14.2 A

97.9%

14.3 A

98.8%

13.3 A

99.2%

15.7 A

99.4%

16.7 A

97.9%

16.7 A

98.8%

15.8 A

99.2%

17.7 A

99.4%

18.6 A

97.9%

18.7 A

98.8%

17.8 A

99.2%

19.8 A

99.3%

20.7 A

97.8%

20.8 A

98.8%

19.8 A

99.1%

21.8 A

99.3%

22.8 A

97.7%

22.8 A

98.7%

21.9 A

99.1%

22.8 A

99.3%

24.4 A

97.6%

24.4 A

98.7%

23.5 A

99.0%

26.9 A

97.6%

26.9 A

98.6%

25.9 A

99.0%

28.9 A

97.4%

28.9 A

98.5%

27.9 A

99.0%