The reference book "Trilogy of Wireless Power Transfer" by Würth Elektronik is now available in a revised second edition. The manufacturer with the largest selection of wireless power coils on the market shares its expertise in wireless power transmission. The practice-oriented reference book consists of three parts: Basic Principles of Wireless Power Transmission, Wireless Power Transfer Systems and Applications. The first part of the reference book has been completely revised and explains the physical principles of the various methods of contactless power transmission. The key standards and developments of the technology are also discussed. The second part describes the wireless power transfer systems and the different topologies of wireless power transmission. In the same chapter, the correct selection of the required transmitter and receiver coils to increase efficiency, and also the available transistors, are discussed. The practice-oriented third part is supplemented with an innovative application: NFC communication together with wireless power transmission. An overview of EMI-related topics rounds off the compilation of application examples in the practice section. The authors of the "Trilogy of Wireless Power Transfer" are Cem Som, Vice President Europe at Wurth Electronics Midcom Inc. and Dr. Michael de Rooij, Vice President Applications Engineering at Efficient Power Conversion Corporation, Inc.