An Overview of Resonant Circuits for Wireless Power Transfer

• Main Authors: Jiang, Chaoqiang (Author), Chau, K. T. (Author), Liu, Chunhua (Author), Lee, Ho Tin (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science (Contributor), Massachusetts Institute of Technology. Research Laboratory of Electronics (Contributor)
• Format: Article
• Language: English
• Published: Multidisciplinary Digital Publishing Institute (MDPI), 2018-12-07T18:42:57Z.
• Subjects: Article
• Online Access: Get fulltext

 With ever-increasing concerns for the safety and convenience of the power supply, there is a fast growing interest in wireless power transfer (WPT) for industrial devices, consumer electronics, and electric vehicles (EVs). As the resonant circuit is one of the cores of both the near-field and far-field WPT systems, it is a pressing need for researchers to develop a high-efficiency high-frequency resonant circuit, especially for the mid-range near-field WPT system. In this paper, an overview of resonant circuits for the near-field WPT system is presented, with emphasis on the non-resonant converters with a resonant tank and resonant inverters with a resonant tank as well as compensation networks and selective resonant circuits. Moreover, some key issues including the zero-voltage switching, zero-voltage derivative switching and total harmonic distortion are addressed. With the increasing usage of wireless charging for EVs, bidirectional resonant inverters for WPT based vehicle-to-grid systems are elaborated. Keywords: magnetic resonance; wireless power transfer; non-resonant converters; resonant inverters; compensation networks; selective resonant circuits