Publication

Converter Techniques

  • R. Das and 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, 2022, Download
  • R. Das and H. -P. Le, “An Accurate Approach to Calculate and Measure Capacitor Voltage and Inductor Current Levels in Hybrid Converters,” 2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics (COMPEL), 2021, pp. 1-5, Download
  • R. Das, J. Celikovic, S. Abedinpour, M. Mercer, D. Maksimovic, and H.-P. Le, “Demystifying Capacitor Voltages and Inductor Currents in Hybrid Converters,” in 2019 20th Workshop on Control and Modeling for Power Electronics (COMPEL), Jun. 2019, pp. 1–8. (Best Paper Award) Download
  • J. Celikovic, R. Das, H. Le, and D. Maksimovic, “Modeling of Capacitor Voltage Imbalance in Flying Capacitor Multilevel DC-DC Converters,” 2019 20th Workshop on Control and Modeling for Power Electronics (COMPEL), Toronto, ON, Canada, 2019, pp. 1-8. Download

Integrated DC-DC Converters

  • T. Tran-Dinh, H. M. Pham, L. Pham-Nguyen, S. -G. Lee and H. -P. Le, “Power Management IC With a Three-Phase Cold Self-Start for Thermoelectric Generators,” in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 68, no. 1, pp. 103-113, Jan. 2021. (invited paper) Download
  • T. Tran-Dinh et al., “Low-Power PMIC with Two Hybrid Converters for TEG Application,” 2020 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), 2020, Download

Smart-Cable and Inductor-First Power Converters

  • C. Hardy, Y. Ramadass, K. Scoones, and H-P. Le, “A Flying-Inductor Hybrid DC-DC Converter for 1-Cell and 2-Cell Smart-Cable Battery Chargers,” in IEEE Journal of Solid-State Circuits, 2019. (invited paper) Download
  • G. Seo and H-P. Le, “S-Hybrid Step-Down DC-DC Converter-Analysis of Operation and Design Considerations,” in IEEE Transactions on Industrial Electronics, Feb. 2019. Download
  • C. Hardy and H-P. Le, “8.3 A 10.9W 93.4%-Efficient (27W 97%-Efficient) Flying-Inductor Hybrid DC-DC Converter Suitable for 1-Cell (2-Cell) Battery Charging Applications,” 2019 IEEE International Solid-State Circuits Conference – (ISSCC), San Francisco, CA, USA, 2019, pp. 150-152. Download 
  • G. S. Seo and H-P. Le, “Hybrid Converters with Reduced Inductor Loss for Integratable Power Conversion,” 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia), Niigata, 2018, pp. 213-218.  (invited paper) Download
  • G. S. Seo and H-P. Le, “Small-signal analysis of S-hybrid step-down DC-DC converter,” 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), Stanford, CA, 2017, pp. 1-6.  Download
  • R. Goel, G. S. Seo and H-P. Le, “A smart-USB-cable buck converter with indirect control,” 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL), Stanford, CA, 2017, pp. 1-6.  Download
  • G. S. Seo and H-P. Le, “An inductor-less hybrid step-down DC-DC converter architecture for future smart power cable,” 2017 IEEE Applied Power Electronics Conference and Exposition (APEC), Tampa, FL, 2017, pp. 247-253. Download

iPower for Soft Robots

  • T. Xie, M. R. Oltra and H. Le, “A 5kV/15W Dual-Transformer Hybrid Converter with Extreme 2000X Conversion Ratios for Soft Mobile Robots,” 2020 IEEE Applied Power Electronics Conference and Exposition (APEC), New Orleans, LA, USA, 2020, pp. 1548-1552. Download

Grid, Bus Power Converters for Data Centers, and Telecommunication Systems

  • R. Das and H. -P. Le, “Modular Isolated Vertically Symmetric Dual Inductor Hybrid Converter For Differential Power Processing,” 2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021, pp. 2439-2443. Download
  • R. Das and H. -P. Le, “Modular Hybrid Step-Down PFC Converter for Direct AC/DC Conversion with Differential Power Processing in Data Centers,” 2021 IEEE Energy Conversion Congress and Exposition (ECCE), 2021, pp. 2219-2223. Download
  • R. Das, G.-S. Seo, and H.-P. Le, “Analysis of Dual-Inductor Hybrid Converters for Extreme Conversion Ratios,” IEEE Journal of Emerging and Selected Topics in Power Electronics (JESTPE), April 2020. Download
  • G. Seo, R. Das, and H-P. Le, “Dual Inductor Hybrid Converter for Point-of-Load Voltage Regulator Modules,” in IEEE Transactions on Industry Applications, Sept. 2019. (invited paper) Download
  • R. Das and H-P. Le, “A Regulated 48V-to-1V/100A 90.9%-Efficient Hybrid Converter for POL Applications in Data Centers and Telecommunication Systems,” 2019 IEEE Applied Power Electronics Conference and Exposition (APEC), Anaheim, CA, USA, 2019, pp. 1997-2001. Download
  • T. Xie, R. Das, G. Seo, D. Maksimovic, and H-P. Le, “Multiphase Control for Robust and Complete Soft-charging Operation of Dual Inductor Hybrid Converter,” 2019 IEEE Applied Power Electronics Conference and Exposition (APEC), Anaheim, CA, USA, 2019, pp. 1-5. Download
  • R. Das, G. Seo, D. Maksimovic, and H-P. Le, “An 80-W 94.6%-Efficient Multi-Phase Multi-Inductor Hybrid Converter,” 2019 IEEE Applied Power Electronics Conference and Exposition (APEC), Anaheim, CA, USA, 2019, pp. 25-29. Download
  • G-S. Seo, R. Das, and H-P. Le, “A 95%-Efficient 48V-to-1V/10A VRM Hybrid Converter Using Interleaved Dual Inductors,” 2018 IEEE Energy Conversion Congress and Exposition (ECCE), Portland, OR, 2018, pp. 3825-3830. Download 
  • R. Das, G-S. Seo, and H-P. Le, “A 120V-to-1.8V 91.5%-Efficient 18-W Dual-Inductor Hybrid Converter with Natural Soft-charging Operations for Direct Extreme Conversion Ratios,” 2018 IEEE Energy Conversion Congress and Exposition (ECCE), Portland, OR, 2018, pp. 1266-1271. Download
  • L. Pham-Nguyen, V-Q. Nguyen, D-M. Nguyen, H-D. Han, K-H. Nguyen, and H-P. Le, “A 14-W 92%-Efficient Hybrid DC-DC Converter with Advanced Bootstrap Gate Drivers for Smart Home LED Applications,” 2018 IEEE Energy Conversion Congress and Exposition (ECCE), Portland, OR, 2018, pp. 4744-4749. Download

Energy-Efficient System Solution

  • B. Zimmer, et al., ‘A RISC-V Vector Processor With Simultaneous-Switching Switched-Capacitor DC-DC Converters in 28 nm FDSOI,’ IEEE Journal of Solid-State Circuits, vol.51, no.4, pp.930-942, April 2016. (invited paper) Download
  • R. Muller, H-P. Le, W. Li, et al., ‘A Minimally Invasive 64-Channel Wireless µECoG Implant,’ IEEE Journal of Solid-State Circuits Vol. 50, No.1, pp. 344-359, Jan. 2015. (invited paper) Download
  • B. Zimmer, et al., ‘A RISC-V Vector Processor with Tightly-Integrated Switched-Capacitor DC-DC Converters in 28nm FDSOI,’ VLSI Circuits Digest of Technical Papers, 2014 Symposium on June 2015. Download
  • R. Jevtic, H-P. Le, M. Blagojevic, et al.,, ‘Per-Core DVFS with Switched-Capacitor Converters for Energy Efficiency in Many-core Processors,’ Very Large Scale Integration (VLSI) Systems, IEEE Transactions on Iss. 99, pp.1, May 2014. Download
  • R. Muller, H-P. Le, W. Li, et al., ‘A Miniaturized 64-Channel 225µW Wireless Electrocorticographic Neural Sensor,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 412-143, Feb. 2014. Download
  • M. J. Turnquist, J. Makipaa, M. Hiienkari, H-P. Le and L. Koskinen, ‘Rethinking DC-DC Converter Design Constraints for Adaptable Systems that Target the Minimum-Energy Point,’ The International Symposium on Low Power Electronics and Design (ISPLED) pp.383-388, Sept. 2013. Download

Fully Integrated Power Conversion

  • H-P. Le, ‘Fully integrated power conversion and the enablers,’ Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015 9th International Conference on pp.1778-1783, Jun 2015. (invited paper) Download
  • S. Sanders, E. Alon, H-P. Le, M. Seeman, M. John, V. Ng, ‘The Road to Fully Integrated DC-DC Conversion via the Switched-Capacitor Approach,’ Power Electronics, IEEE Transaction on pp. 4146 – 4155, Vol. 28, Iss. 9, Sept. 2013. Download
  • H-P. Le, J. Crossley, S. Sanders, and E. Alon, ‘A Sub-ns Response Fully-Integrated Battery-Connected Switched-Capacitor Voltage Regulator Delivering 0.19W/mm2 at 73% Efficiency,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 372-373, Feb. 2013. Download
  • H-P. Le, S. Sanders, and E. Alon, ‘Design Techniques for Fully Integrated Switched-Capacitor DC-DC Converters,’ IEEE Journal of Solid-State Circuits pp. 2120 – 2131, Vol. 46, Iss. 9, Sep. 2011. Download
  • M. Seeman, V. W. Ng, H-P. Le, M. Johns, E. Alon, S.R. Sanders, ‘A Comparative Analysis of Switched-Capacitor and Inductor-Based DC-DC Conversion Technologies,’ Control and Modeling for Power Electronics (COMPEL), 2010 IEEE 12th Workshop on pp. 1-7, June 2010. Download
  • H-P. Le, M. Seeman, S. Sanders, V. Sathe, S. Naffziger, and E. Alon, ‘A 32nm Fully Integrated Reconfigurable Switched-Capacitor DC-DC Converter Delivering 0.55W/mm2 at 81% Efficiency,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 210-211, Feb. 2010. Download

Single Inductor Multiple Output (SIMO) DC-DC Converter

  • S-W. Wang, H-P. Le, Y-J. Woo, et al., ‘Low-Power Consumptive Luminance Compensation for a Digital Driving AMOLED Display using a Multiple Output Boost Converter,’ Symposia and International Display (SID) Research Conferences May 2010. Download
  • C-S. Chae, H-P. Le, K-C. Lee, G.H. Cho, and G-H. Cho, ‘A Single Inductor Step-up DC-DC Switching Converter with Bi-polar Outputs for AMOLED Mobile Display Panels,’ IEEE Journal of Solid-State Circuits Vol. 44, Iss.2, pp. 509-524, Feb. 2009. Download
  • Y-J. Woo, H-P. Le, G.H. Cho, G-H. Cho, S-I. Kim, ‘Load-Independent Control of Switching DC-DC Converters with Freewheeling Current Feedback,’ IEEE Journal of Solid-State Circuits Vol. 43, Iss.12, pp. 2798-2808, Dec. 2008. Download
  • Y-J. Woo, H-P. Le, G.H. Cho, G-H. Cho, S-I. Kim, ‘Load-Independent Control of Switching DC-DC Converters with Freewheeling Current Feedback,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 446-447, Feb. 2008. Download
  • H-P. Le, C-S. Chae, K-C. Lee, G.H. Cho, S-W. Wang and G-H. Cho, ‘A Single-Inductor Switching DC-DC Converter with 5 Outputs and Ordered Power-Distributive Control,’ IEEE Journal of Solid-State Circuits Vol. 42, Iss.12, pp. 2706-2714, Dec. 2007. (invited paper) Download
  • H-P. Le, C-S. Chae, K-C. Lee, G-H. Cho, S-W. Wang, G.H. Cho, S-I. Kim, ‘A Single-Inductor Switching DC-DC Converter with 5 Outputs and Ordered Power-Distributive Control,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 534-620, Feb. 2007. Download
  • C-S. Chae, H-P. Le, K-C. Lee, G.H. Cho, and G-H. Cho, ‘A Single Inductor Step-up DC-DC Switching Converter with Bi-polar Outputs for AMOLED Mobile Display Panels,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 132-592, Feb. 2007. Download
  • H-P. Le, C.S. Chae, M.C. Lee, et al., ‘Integrated zero-inductor-current detection circuit for step-up DC-DC converters,’ Electronics Letters Vol. 42, no. 16, pp. 943-944, August 3, 2006. Download

Miscellaneous

  • J. Crossley, A. Puggelli, H-P. Le, et al., ‘BAG: A Designer-Oriented Integrated Framework for the Development of AMS Circuit Generators,’ Computer-Aided Design (ICCAD), 2013 IEEE/ACM International Conference on pp. 74-81, Nov. 2013. Download
  • J. Crossley, A. Puggelli, H-P. Le, et al., ‘AMS Circuit Generation, It’s in the BAG,’ the Workshop on Frontiers in Analog CAD Feb. 2013. Download
  • R. Muller, P. Ledochowitsch, H-P. Le, et al., ‘A Minimally Invasive, Wireless Platform for Electrocorticography,’ Society for Neuroscience Conference October 2012. (Poster and Abstract) Download
  • R. Muller, W. Li, H-P. Le, et al., ‘Low-Power, Wireless Platform for Implantable Brain-Machine Interfaces,’ Global Technology Leaders Conference Nov. 2011. (Poster) Download
  • T-W. Kwak, M-C. Lee, B-K. Choi, H-P. Le and G-H. Cho, ‘A 2W CMOS Hybrid Switching Amplitude Modulator for EDGE Polar Transmitter,’ IEEE International Solid-State Circuits Conference (ISSCC) Dig. Tech. Papers pp. 518-619, Feb. 2007. Download
  • Y-U. Hong, B-K. Choi, Y-J. Woo, M-C. Lee, T-W. Kwak, H-P. Le and G-H. Cho, ‘Optimum efficiency-tracking gate driver using adaptive deadtime control for single-chip DC-DC converter,’ Power Electronics Specialists Conference, 2006. PESC ’06. 37th IEEE pp. 1-5, Jun. 2006. Download
  • H.N. Nguyen, H.B. Phi, H-P. Le, et al., ‘Giant Magnetoimpedance Measurement System Applied to Researches of Amorphous and Nanocrystalline Materials and Sensors,’ Proceedings of 9th Biennial Vietnam Conference on Radio& Electronics (REV 2004), Hanoi, Vietnam pp. 235-238, November 2004.
  • L. V. Phi, H.N. Nguyen, H-P. Le, and H.B. Phi, ‘Luminescence of SiOx defects – Influence of SiOx on photoluminescence spectra of nc-Si in SiOx,’ National Physics Conference on Hard Materials VLCRIV, Vietnam Nov. 2003.
  • H.N. Nguyen, L. V. Phi, H-P. Le, and H.B. Phi, ‘Simulation of J-V characteristics of MOS structures containing silicon crystals in LED applications,’ National Physics Conference on Hard Materials VLCRIV, Vietnam Nov. 2003. 

Patents

  • H-P. Le, R. Masleid, ‘Precision Sampling Circuit,’ US Patent, US 8,179,165 B2 Download
  • H-P. Le, R. Masleid, ‘Delay Chain Initialization,’ US Patent, US 8,242,823 B2 Download
  • H-P. Le, R. Masleid, D. Greenhill, ‘Fine Grain Timing,’ US Patent, US 8,198,931 B2 Download
  • H-P. Le, R. Masleid, D. Greenhill, ‘Minimal Bubble Voltage Regulator,’ US Patent, US 8,283,960 B2 Download