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2. Hybrid Edge Termination for High-Voltage Vertical GaN Devices: Empirical Validation and Robust Processing Tolerance

Author

Pandey, Prakash, Nelson, Tolen M., Hontz, Michael R., Georgiev, Daniel G., Khanna, Raghav, Jacobs, Alan G., Lundh, James S., Gallagher, James C., Koehler, Andrew D., Hobart, Karl D., and Anderson, Travis J.

Abstract

This study presents empirical validation of a simulated novel hybrid edge termination (HET) structure with planar ion implantation processing for vertical gallium nitride (GaN) diodes. The hybrid structure combines a junction termination extension (JTE) with superimposed guard rings (GRs), creating zones with alternating implantation depths. A design optimization strategy is employed to match the charge profile in the termination to that of a reference beveled edge termination, and is validated through the fabrication of ~1.5 kV GaN diodes. The breakdown voltage of the hybrid termination is tied to the fitting error between the charge profile of the hybrid structure and the reference bevel, as confirmed through simulations and experimental results. The proposed structure successfully emulates the properties of a bevel termination without the need for complex etching or lithography procedures. Additionally, the tolerance of the proposed hybrid structure to major process variations during the wafer growth and device fabrication are studied in simulations. The hybrid termination structure showcases remarkable robustness against major process variations, making it a viable choice for high-yield manufacturing. The findings and patterns presented in this work offer significant insights for the design and large-scale production of forthcoming high-power vertical GaN devices.

Published
2024
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4. A Simple Edge Termination Design for Vertical GaN P-N Diodes

Author

Pandey, Prakash, primary, Nelson, Tolen M., additional, Collings, William M., additional, Hontz, Michael R., additional, Georgiev, Daniel G., additional, Koehler, Andrew D., additional, Anderson, Travis J., additional, Gallagher, James C., additional, Foster, Geoffrey M., additional, Jacobs, Alan, additional, Ebrish, Mona A., additional, Gunning, Brendan P., additional, Kaplar, Robert J., additional, Hobart, Karl D., additional, and Khanna, Raghav, additional

Published
2022
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5. Characterization and Modeling of a 1.3 kV Vertical GaN Diode

Author

Pandey, Prakash, primary, Collings, William, additional, Mahmud, Sadab, additional, Nelson, Tolen, additional, Hontz, Michael R., additional, Georgiev, Daniel G., additional, Koehler, Andrew D., additional, Anderson, Travis J., additional, Gallagher, James C., additional, Foster, Geoffrey M., additional, Jacobs, Alan, additional, Ebrish, Mona A., additional, Hobart, Karl D., additional, and Khanna, Raghav, additional

Published
2022
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21. Isolated/non-isolated quad-inverter configuration for multilevel symmetrical/asymmetrical dual six-phase star-winding converter

Author

Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, Ojo Olorunfemi, Joseph, Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, and Ojo Olorunfemi, Joseph

Abstract

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and ‘More-Electric Aircraft’ propulsion systems.

22. Isolated/non-isolated quad-inverter configuration for multilevel symmetrical/asymmetrical dual six-phase star-winding converter

Author

Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, Ojo Olorunfemi, Joseph, Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, and Ojo Olorunfemi, Joseph

Abstract

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and ‘More-Electric Aircraft’ propulsion systems.

23. Isolated/non-isolated quad-inverter configuration for multilevel symmetrical/asymmetrical dual six-phase star-winding converter

Author

Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, Ojo Olorunfemi, Joseph, Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, and Ojo Olorunfemi, Joseph

Abstract

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and ‘More-Electric Aircraft’ propulsion systems.

24. Isolated/non-isolated quad-inverter configuration for multilevel symmetrical/asymmetrical dual six-phase star-winding converter

Author

Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, Ojo Olorunfemi, Joseph, Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, and Ojo Olorunfemi, Joseph

Abstract

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and ‘More-Electric Aircraft’ propulsion systems.

25. Isolated/non-isolated quad-inverter configuration for multilevel symmetrical/asymmetrical dual six-phase star-winding converter

Author

Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, Ojo Olorunfemi, Joseph, Padmanaban, Sanjeevikumar, Hontz, Michael R., Khanna, Raghav, Wheeler, Patrick William, Blaabjerg, Frede, and Ojo Olorunfemi, Joseph

Abstract

This article presents the developments of a novel isolated/non-isolated quad inverter configuration for multilevel dual six-phase (twelve-phase) star-winding converter. The modular circuit consists of four standard voltage source inverters (VSIs). Each VSI is incorporated with one bi-directional switch (MOSFET/IGBT) per phase and links with the neutral line through two capacitors which allows symmetrical and asymmetrical operations. A modified single carrier five-level modulation (MSCFM) algorithm is developed and modulates each 2-level VSI as a 5-level output multilevel inverter. The entire AC converter is numerically modeled using Matlab/PLECS simulation software and the predicted behavior of the system is analyzed and presented. Good agreement is obtained between these results and the theoretical analysis. Suitable applications for the converter include (low-voltage/high-current) medium power systems, electrical vehicles, AC tractions, and ‘More-Electric Aircraft’ propulsion systems.

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