Parity-Time Symmetric Wireless Power Transfer

This book belongs to the subject of Electric Engineering, and involves the concept of PT symmetry in quantum mechanics. It presents a concise and insightful view of the knowledge on PT symmetric circuits. This book first offers an overview of the development and challenges of wireless power transfer technology, as well as the introduction of PT symmetry in wireless power transfer, and then briefly introduces PT symmetry and its representation in circuits, so as to present the realization methods of negative resistor as the key component of PT symmetric circuits. On this basis, PT symmetric wireless power transfer systems are constructed, and their characteristics, including constant power, constant efficiency, constant voltage and constant current, are analyzed. Therein, the system designs and implementations are also mentioned. Next, the various techniques for improving performances of PT symmetric wireless power transfer, such as improvement of transfer distance, reduction of switching frequency and losses, etc. Moreover, the basic structures, transfer characteristics, system designs and implementations of different types of PT symmetric wireless power transfer systems are proposed, including multi-load system, multi-relay coil system, capacitive coupled system, inductive and capacitive dual-coupled system. Therefore, this book provides readers with enough background and understanding to go deeper in the topic of PT symmetric wireless power transfer, so that this book can be used as a textbook for courses related to PT symmetric circuits, PT symmetric wireless power transfer, etc. This book is intended for students without an extensive mathematical background, and is suitable for advanced undergraduate and graduate students, engineers and researchers who focus on the PT symmetric circuits, PT symmetric wireless power transfer systems.

Introduction.- PT Symmetric Principle and Circuits.- PT Symmetric Wireless Power Transfer System and Its Characteristics.- Transfer Characteristics of Constant Power and Constant Efficiency Against Misalignment.- Transfer Characteristics of Constant Power and Constant Efficiency Against Distance.- Transfer Characteristics of Constant Voltage / Constant Current.- Multi-Load PT Symmetric Wireless Power Transfer System.- High-Order PT Symmetric Wireless Power Transfer System With Relay Coils.- Techniques for Improving Performances of PT Symmetric Wireless Power Transfer.- Electric-Field Coupling PT Symmetric Wireless Power Transfer System.- Inductive and Capacitive Dual-Coupled PT Symmetric Wireless Power Transfer System.

Bo Zhang (Fellow, IEEE) was born in Shanghai, China, in 1962. He received the B.S. degree in electrical engineering from Zhejiang University, Hangzhou, China, in 1982, the M.S. degree in power electronics from Southwest Jiaotong University, Chengdu, China, in 1988, and the Ph.D. degree in power electronics from the Nanjing University of Aeronautics and Astronautics, Nanjing, China, in 1994. He is currently a Distinguished Professor with the School of Electric Power, South China University of Technology, Guangzhou, China. He has authored or co-authored 7 books in IEEE-Wiley and Springer and over 600 technical papers, and he holds over 230 patents. His current research interests include nonlinear analysis, modeling and control of power electronic converters, and wireless power transfer applications.

Xujian Shu was born in Anhui, China. She received the B.S. degree in electrical engineering and automation from China University of Mining and Technology, Xuzhou, China, in 2015, and received the Ph.D. degree in power electronics from South China University of Technology, Guangzhou, China, in 2021. She is currently a lecturer of Fuzhou University, Fuzhou, China. Her research interests include wireless power transfer applications, and fractional-order circuits.

Lihao Wu was born in Fujian, China, in 1994. He received the B.S. degree in electrical engineering from Fuzhou University, Fuzhou, China, in 2017. and the Ph.D. degree in power electronics at School of Electric Power, South China University of Technology, Guangzhou, China, in 2022. His research interests include wireless power transfer applications and power electronics converters.