Publication

Integrated Hybrid and Smart-Cable Power Converters

  • C. Hardy and H. -P. Le, “A Reconfigurable Single-Inductor Multi-Stage Hybrid Converter for 1-Cell Battery Chargers,” in IEEE Journal of Solid-State Circuits. (invited paper) Download
  • C. Hardy et al., “11.1 A Scalable Heterogeneous Integrated Two-Stage Vertical Power-Delivery Architecture for High-Performance Computing,” 2023 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, USA, 2023, pp. 182-184. Download
  • C. Hardy and H. -P. Le, “11.5 A 21W 94.8%-Efficient Reconfigurable Single-Inductor Multi-Stage Hybrid DC-DC Converter,” 2023 IEEE International Solid-State Circuits Conference (ISSCC), San Francisco, CA, USA, 2023, pp. 190-192. Download
  • T. Xie, J. Zhu, D. Maksimovic and H. -P. Le, “A Highly Integrated Hybrid DC–DC Converter With nH-Scale IPD Inductors,” in IEEE Journal of Solid-State Circuits, vol. 58, no. 3, pp. 705-719, March 2023. (invited paper) Download
  • T. Xie, J. Zhu, T. Byrd, D. Maksimovic and H. -P. Le, “A 0.66 W/mm2 Power Density, 92.4% Peak Efficiency Hybrid Converter with nH-Scale Inductors for 12 V System,” 2022 IEEE Custom Integrated Circuits Conference (CICC), Newport Beach, CA, USA, 2022, pp. 01-02. Download
  • 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
  • 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 

iPower for Soft Robots

  • T. Lodh and H.-P. Le, “Derivation of Ultra-High Gain Hybrid Converter Families for HASEL Actuators Used in Soft Mobile Robots,” Biomimetics 8, no. 6: 483, 2023. Download
  • T. Lodh and H. -P. Le, “Power Electronic Drivers for Electrostatic HASEL Actuators Used in Soft Mobile Robots,” in IEEE Journal of Emerging and Selected Topics in Industrial Electronics, Download
  • T. Lodh and H.-P. Le, “An Ultra High Gain Converter for Driving HASEL Actuator Used in Soft Mobile Robots,” Biomimetics 8, no. 1: 53, 2023. Download
  • 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

Converter Techniques and Optimization

  • 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. Download
  • R. Das and H. -P. Le, “Multi-Inductor Multi-Output Hybrid (MiMoH) Converter for Large Conversion Ratio and Multiple Outputs,” 2023 IEEE Applied Power Electronics Conference and Exposition (APEC), Orlando, FL, USA, 2023, pp. 943-947. Download
  • T. Xie and H. -P. Le, “A Zero-Voltage-Switching 3-Level Buck Converter Achieving 30% Loss Reduction at Light Load for USB-C Charger Applications,” 2023 IEEE Applied Power Electronics Conference and Exposition (APEC), Orlando, FL, USA, 2023, pp. 932-936. Download
  • R. Das and H. -P. Le, “Gate Driver Circuits With Discrete Components for GaN-Based Multilevel Multi-Inductor Hybrid Converter,” in IEEE Transactions on Industrial Electronics, vol. 70, no. 2, pp. 1105-1114, Feb. 2023, doi: 10.1109/TIE.2022.3158014. Download
  • 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

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

  • H. Pham, R. Das, C. Hardy, D. Kimball, P. Asbeck and H. -P. Le, “Adjustable 4-Level Hybrid Converter for Symbol Power Tracking in 5G New Radio,” 2023 IEEE Applied Power Electronics Conference and Exposition (APEC), Orlando, FL, USA, 2023, pp. 1858-1861. Download
  • Q. Nguyen, H. -D. Han, L. Pham-Nguyen and H. -P. Le, “A 60V Input Integrated 3-to-1 Dual Inductor Hybrid Dickson Converter,” 2022 IEEE Asia Pacific Conference on Circuits and Systems (APCCAS), Shenzhen, China, 2022, pp. 309-313. Download
  • R. Das, H.-P. Le, “A Two-Stage 110VAC-to-1VDC Power Delivery Architecture Using Hybrid Converters for Data Centers and Telecommunication Systems” TechRxiv. Preprint. https://doi.org/10.36227/techrxiv.16557711.v2. Download
  • 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
  • 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
  • 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
  • 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