New Topologies and Modulation Schemes for Soft-Switching Isolated DC–DC Converters

Zhiqiang Guo received his B.S. in Automation from the Hebei University of Technology, Tianjin, China, in 2008, and his M.S. and Ph.D. in electrical engineering from the Beijing Institute of Technology, Beijing, China, in 2010 and 2015. He was a Postdoctoral Research Fellow with the Department of Electrical Engineering, Tsinghua University, Beijing, China, from 2015 to 2017. Since 2017, He joined the faculty of School of Automation, Beijing Institute of Technology, Beijing, China, where he is an Assistant Professor. He is author or co-author of more than 30 technical papers, of which more than 20 is international journals. His current research interests include DC-DC converters, distributed generation, and microgrid applications. Deshang Sha is currently a Professor in the school of Automation, Beijing Institute of Technology. From 2012 to 2013, he was a Visiting Scholar with the Future Energy Electronics Center (FEEC), Virginia Polytechnic Institute and State University, USA.His research interests are in the areas of high frequency isolated and high efficiency power conversion, power electronics application in renewable energy and micro-grid. He has published over 60 papers in international journals, over 30 on international conferences, in which over 30 have been published on IEEE Transactions. He has earned 18 patents in the field of power electronics and has already published three books. In 2013, he was awarded the outstanding reviewer for the IEEE Transactions on Power Electronics. 

Introduction.- Hybrid Phase-Shift-Controlled Three-Level and LLC DC-DC Converter with Active Connection at the Secondary Side.- Hybrid Three-Level and Half-Bridge DC-DC Converter With Reduced Circulating Loss and Output Filter Inductance.- Improved ZVS Three-level DC-DC Converter with Reduced Circulating Loss.- Analysis and Evaluation of Dual Half-bridge Cascaded Three-Level DC-DC Converter for Reducing Circulating Current Loss.- Output-Series Connected Dual Active Bridge Converters for Zero-Voltage-Switching Throughout Full Load Range by Employing Auxiliary LC Networks.- Dual Active Bridge Converter with Parallel-Connected Full Bridges in Low Voltage Side for ZVS by Using Auxiliary Coupling Inductor.- A GaN-Based Micro-converter Utilizing Fixed-Frequency BCM Control Method for PV Applications.- An Unified Modulation Scheme of Current-fed Bidirectional DC-DC Converters for Loss Reduction.