Stacked Active Bridge Converters – A Family of High-Density, High-Efficiency Hybrid Power Converters

Release Time：2022-10-25Number of visits：3506

Speaker:       Dragan Maksimovic,University of Colorado,Boulder

Time:            9:30-11:30am  Oct.28.2022

Host:            Haoyu Wang

Loction:          SIST 1C 101

 

Abstract:    

Magnetic components, which are relatively bulky, lossy, and difficult to integrate or co-package often present limitations to power efficiency and power density of conventional switched-mode power converters. Switched capacitor (SC) converters do not require magnetic components but are hampered by lack of control and losses due to hard capacitor charging and discharging. Various hybrid converter configurations have recently been explored where relatively small inductive components are added to SC configurations to address losses and improve performance. This talk is focused on stacked active bridge (SAB) converters, a family of high-density, high-efficiency hybrid power converters, which combine favorable features of SC converters and operating principles of transformer-isolated dual active bridge (DAB) converters. Transformerless SAB converters feature low voltage and current stresses on semiconductor devices, zero-voltage switching, and simple phase shift control. It is shown how the SAB converters can be constructed systematically starting from various known SC configurations such as doubler, Dickson, ladder, etc. High power density and efficiency exceeding 98% over wide ranges of loads are demonstrated on several hardware prototypes, including 48-to-12 V, 10 A, 48-to-1 V, 80 A, and 400-to-48 V, 60 A discrete-circuit SAB dc-dc converters, as well as a 12-to-3 V, 3 A, monolithic SAB dc-dc converter.

 

Bio:    

Dragan Maksimovic received his B.S. and M.S. degrees from the University of Belgrade in Serbia in 1984 and 1986, respectively, and his Ph.D. degree from the California Institute of Technology in 1989. Since 1992, he has been with the University of Colorado at Boulder, where he is currently a Professor and Director of the Colorado Power Electronics Center (CoPEC). He has co-authored over 300 papers, and two textbooks, Fundamentals of Power Electronics, and Digital Control of High-Frequency Switched-Mode Power Converters. Prof. Maksimovic is a Fellow of the IEEE, recipient of the 2022 IEEE PELS R. David Middlebrook Achievement Award and recipient of the 2023 IEEE William E. Newell Power Electronics Award. His current research interests include power electronics for renewable energy sources and energy efficiency, digital control of high-frequency switched-mode power converters, and high frequency power conversion using wide bandgap semiconductors.