High-Conversion Ratio DC-DC Converters
8. J. Lopez, R. Das and H. -P. Le, "Flying Transformer Multi-Level Converter for Isolation and Seamless Control for 48V POL Applications," 2023 IEEE Energy Conversion Congress and Exposition (ECCE), Nashville, TN, USA, 2023, pp. 2197-2201, doi: 10.1109/ECCE53617.2023.10362723.
7. R. Das, G. S. Seo, H. P. Le, “Analysis of Dual-Inductor Hybrid Converters for Extreme Conversion Ratios,” in IEEE
Journal of Emerging and Selected Topics in Power Electronics, Apr 2020.
6. G. S. Seo, R. Das, H. P. Le, “Dual Inductor Hybrid Converter for Point-of-Load Voltage Regulator Modules,” in IEEE Transactions on Industry Applications, vol. 56, no. 1, pp. 367-377, Jan 2020-Feb 2020.
5. R. Das, H. P. Le, “A Regulated 48V-to-1V/100A 90.9%-Efficient Hybrid Converter for POL Applications in Data Centers and Telecommunication Systems,” in 34th IEEE APEC, Anaheim, California, Mar 2019.
4. R. Das, G. S. Seo, D. Maksimovic, H. P. Le, “An 80-W 94.6%-Efficient Multi-Phase Multi-Inductor Hybrid Converter,” in 34th IEEE APEC, Anaheim, California, Mar 2019.
3. T. Xie, R. Das, G. S. Seo, D. Maksimovic, H. P. Le, “Multiphase Control for Robust and Complete Soft-charging Operations of Dual Inductor Hybrid Converter,” in 34th IEEE APEC, Anaheim, California, Mar 2019.
2. R. Das, G. S. Seo, H. P. Le, “A 120V-to-1.8V 91.5%-Efficient 36-W Dual-Inductor Hybrid Converter with Natural Soft-charging 2Operations for Direct Extreme Conversion Ratios,” in 10th IEEE ECCE, Portland, Oregon, Sep 2018.
1. G. S. Seo, R. Das, H. P. Le, “A 95%-Efficient 48V-to-1V/10A VRM Hybrid Converter Using Interleaved Dual Inductors,” in 10th IEEE ECCE, Portland, Oregon, Sep 2018.
AC to DC Converters
Das, R., & Le, H.-P. (2025). Two-Stage Power Delivery Architecture Using Hybrid Converters for Data Centers and Telecommunication Systems. Electronics, 14(16), 3169.
Differential Power Processing
2. R. Das, H. P. Le, “Modular PFC Hybrid Step-Down Converter for Direct AC-DC Conversion with Differential Power
Processing in Data Centers,” in 13th IEEE ECCE, Vancouver, Canada, Oct 2021.
1. R. Das, H. P. Le, “Modular Isolated Vertically Symmetric Dual Inductor Hybrid Converter For Differential Power Processing,” in 13th IEEE ECCE, Vancouver, Canada, Oct 2021.
Multi-Output Hybrid DC-DC Converters
3. R. Das and H. -P. Le, "Shared Switched Capacitor Multioutput Hybrid Converter for High Conversion Ratio Applications," in IEEE Open Journal of the Solid-State Circuits Society, vol. 6, pp. 3-14, 2026, doi: 10.1109/OJSSCS.2025.3644337.
1. R. Das, H. P. Le, “Multi-Inductor Multi-Output Hybrid (MiMoH) Converter for Large Conversion Ratio and Multiple Outputs,” Accepted for Lecture Presentation at IEEE APEC 2023.
Modeling of Dynamic and Steady States of Hybrid DC-DC Converters
5. R. Das and H. -P. Le, "Averaged Switch Modeling of Multi-Inductor Hybrid Converters," 2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL), Ann Arbor, MI, USA, 2023, pp. 1-6, doi: 10.1109/COMPEL52896.2023.10221193.
4. R. Das, H. P. Le, “Analysis of Capacitor Voltage Imbalance in Hybrid Converters and Inherently Balanced Operation Using Symmetric Architecture,” in IEEE Journal of Emerging and Selected Topics in Industrial Electronics, Jun 2022.
3. R. Das, H. P. Le, “An Accurate Approach to Calculate and Measure Capacitor Voltage and Inductor Current Levels in Hybrid Converters,” in 2021 22nd COMPEL, Colombia, Nov 2021.
2. R. Das, J. Celikovic, S. Abedinpour, M. Mercer, D. Maksimovic, H. P. Le, “Demystifying capacitor voltages and inductor currents in hybrid converters” in 2019 20th COMPEL, Toronto, Canada, Jun 2019 [Best Paper Award]
1. J. Celikovic, R. Das, H. P. Le, D. Maksimovic, “Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters,” in 2019 20th COMPEL, Toronto, Canada, Jun 2019
Motor Driver Applications
1. Z. Luo, R. Das, H. P. Le, “Switched Capacitor Inverter as Modular Motor Drivers,” Conference Paper Under Preparation, Jun 2023.
Symbol Power Tracking
2. H. M. Pham, R. Das, C. Hardy, D. Kimball, P. Ashbeck, H. P. Le, “Adjustable 4-Level Hybrid Converter for Symbol Power Tracking in 5G NR,” Accepted for Lecture Presentation at IEEE APEC 2023
1. H. M. Pham, R. Das, C. Hardy, D. Kimball, P. Ashbeck, H. P. Le, “Adjustable 4-Level Hybrid Converter for Symbol Power Tracking in 5G NR,” Accepted for Lecture Presentation at IEEE APEC 2023
Miscellaneous
2. H. M. Pham et al., "A 74W/48V Monolithic-GaN Integrated Adjustable Multilevel Supply Modulator for 5G Base-Station Massive-MIMO Arrays," 2025 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, USA, 2025, pp. 1-3, doi: 10.1109/ISSCC49661.2025.10904518.
1. R. Das, H. P. Le, “Gate Driver Circuits With Discrete Components For GaN-based Multi-Level Multi-Inductor Hybrid Converter,” in IEEE Transactions of Industrial Electronics, Mar 2022.
Patents
R. Das, H. P. Le, “Multi-output hybrid converters,” Aug 2018 (US Patent 11,496,045)
R. Das, H. P. Le, G. S. Seo, “Hybrid Converter Family and Methods Thereof,” Aug 2018 (US Patent 11,152,854)