Publication

Selected Journal Publication

• Y. Elasser, J. Baek, K. Radhakrishnan, H. Gan, J. Douglas, H. K. Krishnamurthy, X. Li, S. Jiang, V. De, C. R. Sullivan, and M. Chen, "Mini-LEGO CPU Voltage Regulator," IEEE Transactions on Power Electronics, vol 39, no. 3, pp. 3391 - 3410, March 2024. [Link]

• Y. Elasser, H. Li, P. Wang, J. Baek, K. Radhakrishnan, S. Jiang, H. Gan, X. Zhang, D. Giuliano, and M. Chen, "Circuits and Magnetics co-Design for Ultra-thin Vertical Power Delivery: A Snapshot Review," MRS Advances, December 2023. [Link]

• J. Baek, Y. Elasser, and M. Chen, "MIPS: Multiphase Integrated Planar Symmetric Coupled Inductor for Ultrathin VRM," IEEE Transactions on Power Electronics, vol 38, no. 5, pp. 5609-5614, May 2023. [Link]

• P. Wang, D. Zhou, Y. Elasser, J. Baek, and M. Chen, "Matrix Coupled All-in-One Magnetics for PWM Power Conversion," IEEE Transactions on Power Electronics, vol 37, no. 12, pp. 15035-15050, December 2022. [Link]

Highlighted Paper

• J. Baek, Y. Elasser, K. Radhakrishnan, H. Gan, J. Douglas, H. K. Krishnamurthy, X. Li, S. Jiang, C. R. Sullivan, and M. Chen, "Vertical Stacked LEGO-PoL CPU Voltage Regulator," IEEE Transactions on Power Electronics, vol 37, no. 6, pp. 6305-6322, June 2022.  [Link]

1st place - IEEE TPEL Prize Paper Award (2022), Highlighted Paper

• S. H. Ha, J. Lee, H. Yoon, T. R. Park, J. Baek, J. S. Kim, and G. W. Moon, "Frequency-Variable Resonant Self-Heating Technique for Lithium-Ion Batteries at Low Temperature," IEEE Transactions on Aerospace and Electronic Systems, vol. 58, no. 4, pp. 3399-3410, August 2022. [Link]

• Z. Daniel, E. Youssef, J. Baek, and M. Chen, "Reluctance-Based Dynamic Models for Multiphase Coupled Inductor Buck Converters," IEEE Transactions on Power Electronics, vol. 37, no. 2, pp. 1334-1351, February 2022. [Link]

• J. Baek, K. W Kim, H. S. Youn, and C. E. Kim, "High-Efficiency LLC Resonant Converter with Reconfigurable Voltage Multiplying Rectifier (RVMR) for Wide Output Voltage Applications," IEEE Transactions on Power Electronics, vol. 36, no. 7, pp. 7641-7651, July 2021. [Link]

• Y. D. Lee, G. W. Moon, J. Baek, and C. E. Kim, "A Reconfigurable Totem-pole PFC Rectifier With Light Load Optimization Control Strategy And Soft-switching Capability," IEEE Transactions on Power Electronics, vol. 36, no. 4, pp. 4371-4382, April 2021. [Link]

• C. E. Kim, J. Baek, and J. B. Lee, "Three-Switch LLC Resonant Converter for High-Efficiency Adapter with Universal Input Voltage," IEEE Transactions on Power Electronics, vol. 36, no. 1, pp. 630-638, January 2021. [Link]

• J. Baek, J. B. Lee, and J. K. Kim, "Effective Hold-up Time Extension Method using Fan Control in Server Power Systems," IEEE Transactions on Industrial Electronics vol. 67, no. 7, pp. 5820-5824, July 2020. [Link]

• J. Baek, C. E. Kim, and J. B. Lee, "Semiresonant Half-Bridge Zeta Converter with Reduced Turn-off Currents for High Efficiency Power Supply," IEEE Transactions on Power Electronics, vol. 35, no. 5, pp. 4547-4557, May 2020. [Link]

• M. H. Park, J. Baek, Y. Jeong, and G. W. Moon, "An Interleaved Totem-pole Bridgeless Boost PFC Converter with Soft-Switching Capability Adopting Phase-Shifting Control," IEEE Transactions on Power Electronics, vol. 34, no. 11, pp. 10610-10618, November 2019. [Link]

• J. Baek, J. K. Kim, J. B. Lee, M. H. Park, and G. W. Moon, "A New Standby Structure Integrated with Boost PFC Converter for Server Power Supply," IEEE Transactions on Power Electronics, vol. 34, no. 6, pp. 5283-5293, June 2019. [Link]

• C. E. Kim, J. Baek, and J. B. Lee, "Improved Three Switch-Active Clamp Forward Converter With Low Switching and Conduction Losses," IEEE Transactions on Power Electronics, vol. 34, no. 6, pp. 5209-5216, June 2019. [Link]

• H. S. Youn, J. Baek, and J. K. Kim, "Interleaved Active Clamp Forward Converter Adopting Additional Series-Connected Secondary Windings for Wide Input and High Current Output Applications," IEEE Transactions on Power Electronics, vol. 34, no. 5, pp. 4423-4433, May 2019. [Link]

• J. B. Lee, J. Baek, and J. K. Kim, "A New Zero-Voltage Switching Half-Bridge Converter With Reduced Primary Conduction And Snubber Losses In Wide-Input-Voltage Applications,” IEEE Transactions on Power Electronics, vol. 33, no. 12, pp. 10419-10427, December 2018. [Link]

• J. Baek, C. E. Kim, J. B. Lee, H. S. Youn, and G. W. Moon, "A Simple SR Gate Driving Circuit with Reduced Gate Driving Loss for Phase-Shifted Full-Bridge Converter," IEEE Transactions on Power Electronics, vol. 33, no. 11, pp. 9310-9317, November 2018. [Link]

• C. E. Kim, J. Baek, and J. B. Lee, "High-Efficiency Single-Stage LLC Resonant Converter for Wide-Input-Voltage Range," IEEE Transactions on Power Electronics, vol. 33, no. 9, pp. 7832-7840, September 2018. [Link]

• K. W. Kim, H. S. Youn, J. Baek, Y. Jeong, and G. W. Moon, "Analysis on Synchronous Rectifier Control to Improve Regulation Capability of High-Frequency LLC Resonant Converter," IEEE Transactions on Power Electronics, vol. 33, no. 8, pp. 7252-7259, Aug. 2018. [Link]

• J. Baek, J. K. Kim, J. B. Lee, H. S. Youn, and G. W. Moon, "A Boost PFC Stage Utilized as Half-Bridge Converter for High-Efficiency DC-DC Stage in Power Supply Unit," IEEE Transactions on Power Electronics, vol. 32, no. 10, pp. 7457-7449, Oct. 2017. [Link]

• J. K. Kim, D. K. Yang, J. B. Lee, and J. Baek, "High Light-Load Efficiency Power Conversion Scheme Using Integrated Bidirectional Buck Converter for Paralleled Server Power Supplies," IEEE Transactions on Industrial Electronics, vol. 64, no. 1, pp. 236-243, Jan. 2017. [Link]

• J. B. Lee, J. K. Kim, J. Baek, J. H. Kim, and G. W. Moon, "Resonant Capacitor On/Off Control of Half-Bridge Converter for High-Efficiency Server Power Supply," IEEE Transactions on Industrial Electronics, vol. 63, no. 9, pp. 5410-5415, Sep. 2016. [Link]

• H. S. Youn, J. B. Lee, J. Baek, and G. W. Moon, "A Digital Phase Leading Filter Current Compensation (PLFCC) Technique for CCM Boost PFC Converter to Improve PF in High Line Voltage and Light Load Conditions," IEEE Transactions on Power Electronics, vol. 31, no. 9, pp. 6596-6606, Sep. 2016. [Link]

• S. Y. Cho, I. O. Lee, J. Baek, and G. W. Moon, "Battery Impedance Analysis Considering DC Component in Sinusoidal Ripple-Current Charging," IEEE Transactions on Industrial Electronics, vol. 63, no. 3, pp. 1561-1573, Mar. 2016. [Link]

• H. S. Youn, J. S. Park, K. B. Park, J. Baek, and G. W. Moon, "A Digital Predictive Peak Current Control for Power Factor Correction With Low-Input Current Distortion," IEEE Transactions on Power Electronics, vol. 31, no. 1, pp. 900-912, Jan. 2016. [Link]

• J. Baek, J. K. Kim, J. B. Lee, H. S. Youn, and G. W. Moon, "Integrated Asymmetrical Half-Bridge Zeta (AHBZ) Converter for DC/DC Stage of LED Driver with Wide Output Voltage Range and Low Output Current," IEEE Transactions on Industrial Electronics, vol. 62, no. 12, pp. 7489-7498, Dec. 2015. [Link]

• J. B. Lee, J. K. Kim, J. H. Kim, J. Baek, and G. W. Moon, "A High-Efficiency PFM Half-Bridge Converter Utilizing a Half-Bridge LLC Converter Under Light Load Conditions," IEEE Transactions on Power Electronics, vol. 30, no. 9, pp.4931-4942, Sep. 2015. [Link]

Selected Conference Proceedings

• B. Choi, J. Baek, B. C. Marin, S. Qu, S. Kulasekaran, J. I. Chavarria, L. E. Wojewoda, and K. Radhakrishnan, "CoaxMIL 2.0 – Next Generation Coaxial Magnetic Integrated Inductors for Higher Efficiency Fully Integrated Voltage Regulator," IEEE Electronic Components and Technology Conference (ECTC), Denver, CO, USA, 2024. [Link]

• Y. Elasser, J. Baek, K. Radhakrishnan, H. Gan, J. Douglas, V. De, S. Jiang, H. Krishnamurthy, X. Li, C. R. Sullivan, and M. Chen, "Mini-LEGO: A 1.5-MHz 240-A 48-V-to-1-V CPU VRM with 8.4mm Height for Vertical Power Delivery," IEEE Applied Power Electronics Conference (APEC), Orlando, FL, USA, 2023. [Link]

Outstanding Presentation Award

• S. Thurber, X. Zhang; Y. Jeon, and J. Baek, ''An Auxiliary Circuit with a Flexible LC Resonant Tank for High-Efficiency and Low-Cost Totem-pole Boost Bridgeless Power-Factor Correction Converter,”  IEEE Applied Power Electronics Conference (APEC), Orlando, FL, USA, 2023. [Link]

• H. Cheng, Z. Zheng, P. Kumar, Y. Chen, J. Baek, B. Kim, S. Wagner, N. Verma, J. C. Sturm, and M. Chen, "A Flexible Lightweight 7.4 V Input 300 V to 1500 V Output Power Converter for an Untethered Modular Piezoelectric Soft Robot," IEEE Workshop on Control and Modeling of Power Electronics (COMPEL). Arbor, MI, USA, 2023. [Link]

• Y. Elasser, J. Baek, K. Radhakrishnan, H. Gan, J. Douglas, H. Krishnamurthy, X. Li, S. Jiang, C. R. Sullivan, and M. Chen, "Vertical Stacked 48V-1V LEGO-PoL CPU Voltage Regulator with 1A/mm2 Current Density," IEEE Applied Power Electronics Conference (APEC), Houston, TX, USA, 2022. [Link]

• J. Baek, Y. Elasser, and M. Chen, "Vertical Stacked 48V-1V Voltage Regulator for Ultra High Current Microprocessors," Open Compute Project (OCP) Annual Symposium 2021, San Jose, CA, USA, 2021.  [Link] 

Best Paper Award and Selected Paper for the Oral Presentation Session

• Tanuj Sen, J. Baek, and M. Chen, "Current Balancing of Paralleled Switches in Resonant Converters with Multiphase Coupled Inductor," IEEE Workshop on Control and Modelling of Power Electronics (COMPEL), Cartagena, Colombia, 2021. [Link]

• J. Baek, Y. Elasser, and M. Chen, "3D LEGO-PoL: A 93.3\% Efficient 48V-1.5V 450A Merged-Two-Stage Hybrid Switched-Capacitor Converter with 3D Vertical Coupled Inductors," IEEE Applied Power Electronics Conference and Exposition (APEC), Phoenix, AZ, USA, 2021. [Link] 

• Y. Elasser, J. Baek, C. R. Sullivan, and M. Chen, "Modeling and Design of Vertical Multiphase Coupled Inductors with Inductance Dual Model," IEEE Applied Power Electronics Conference and Exposition (APEC), Phoenix, AZ, USA, 2021. [Link]

• D. Zhou, Y. Elasser, J. Baek, Charles R. Sullivan, and M. Chen, "Inductance Dual Model and Control of Multiphase Coupled Inductor Buck Converter," IEEE Workshop on Control and Modeling of Power Electronics (COMPEL), Aalborg, Denmark, 2020. [Link]

•  Y. Elasser, J. Baek, and M. Chen, "A Merged-Two-Stage LEGO-PoL Converter with Coupled Inductor for Vertical Power Delivery," IEEE Energy Conversion Congress and Exposition (ECCE), Detroit, MI, 2020. [Link] [Video]

Best Demonstration Award for Emerging Technology 1st place 

• J. Baek, Ping Wang, Y. Elasser, Y. Chen, and M. Chen, "LEGO-PoL: A 48V-1.5V 300A Merged-Two-Stage Hybrid Converter for Ultra-High-Current Microprocessor," IEEE Applied Power Electronics Conference and Exposition (APEC), New Orleans, USA, 2020. [Link]

• Y. Chen, J. Baek, and M. Chen, "LEGO-Boost: A Merged-Two-Stage Resonant-Switched-Capacitor Converter with High Voltage Conversion Ratio," IEEE Applied Power Electronics Conference and Exposition (APEC), New Orleans, USA, 2020. [Link]

• J. Baek, Y. Elasser, and M. Chen, "LEGO-PoL: A Family of Extreme Performance Miniaturized Point-of-Load Converters for High Current Microprocessors," Open Compute Project (OCP) Annual Symposium 2020, San Jose, CA, USA, 2020. [Link]

Selected Paper for the Oral Presentation Session

• J. Baek, G. W. Moon, and M. Chen, "A Reverse-Feeding Hold-up Time Strategy for Two-Stage Grid-Interface PFC with a Rectifier-Coupled Boost Inductor," IEEE Energy Conversion Congress and Exposition (ECCE), Baltimore, MD, 2019, USA. [Link]

Selected Paper for Dr. Jovanovic Memorial Session

• J. Baek, P. Wang, S. Jiang, and M. Chen, "LEGO-PoL: A 93.1% 54V-1.5V 300A Merged-Two-Stage Hybrid Converter with a Linear Extendable Group Operated Point-of-Load (LEGO-PoL) Architecture," IEEE Workshop on Control and Modeling of Power Electronics (COMPEL), Toronto, Canada, 2019.[Link]

• Y. Chen, Y. Elasser, P. Wang, J. Baek, and M. Chen, "Turbo-MMC: Minimizing the Submodule Capacitor Size in Modular Multilevel Converter with a Matrix Charger Balancer," IEEE Workshop on Control and Modeling of Power Electronics (COMPEL), Toronto, Canada, 2019. [Link]