This chapter introduces control schemes based on the PT-symmetric wireless power transfer (WPT) system. It begins with an overview of PT symmetry and its relevance to WPT, followed by detailed models and analyses based on circuit theory and coupled-mode theory. The chapter explores the output characteristics of PT-symmetric systems and presents control methods for optimizing output power through load identification. Experimental results are provided to validate the proposed control schemes, demonstrating their effectiveness in managing power transfer and enhancing system performance. The chapter highlights the innovative aspects of PT-symmetric WPT and its potential applications.

This chapter addresses techniques for extending the charging range of PT-symmetric WPT systems. It begins with an introduction to range extension methods and then explores the use of S/SLDC high-order topologies for improved performance. The chapter includes system analysis, modelling, and comparison with other topologies, focusing on negative resistance design to enhance range. Additionally, it presents flexible charging range extension methods, such as autonomous on-off keying modulation schemes, and discusses their system output characteristics and control algorithm implementation. Experimental verification supports the proposed methods, showcasing advancements in expanding the operational range of PT-symmetric WPT systems.