SLUP412 February   2022 LMG3522R030-Q1

 

  1. 1 Introduction
  2. 2 Comparing Different Technologies
  3. 3 Advantages of Integrating the Driver With GaN FETs
  4. 4 The GaN-Based 6.6-kW OBC Reference Design
  5. 5 PFC Stage
  6. 6 DC/DC Stage
  7. 7 DC/DC Topology Selection
  8. 8 Frequency Selection
  9. 9 Core Loss
  10. 10Loss of ZVS
  11. 11Dead Time
  12. 12ISR Bandwidth
  13. 13Overall
  14. 14Resonant Tank Design
  15. 15Thermal Solution
  16. 16Layout Best Practices
  17. 17Control-Loop Considerations
  18. 18Conclusions
  19. 19References
  20. 20Important Notice

18 Conclusions

Figure 18-1 shows a picture of the final converter, while Figure 18-2 shows the end-to-end efficiency operating at the highest output current condition. The power density of the design came out at 62.5 W/inch3, or 3.8 kW/L.

GUID-20220218-SS0I-3TRC-KXWX-9HKNCZ76CFWP-low.jpg Figure 18-1 6.6-kW OBC with liquid-cooled cold plate.
GUID-20220218-SS0I-JMNB-VRFM-RSDV0QG5V1VG-low.png Figure 18-2 Measured system efficiency of the 6.6-kW OBC.

GaN’s fast switching performance enables high-frequency power supplies that reduce size while maintaining high efficiency. With these high frequencies, a variety of challenges emerge, requiring cost-effective countermeasures that help maximize the benefits that come from high-speed switching.