GaN-based wireless charging system with self-driven rectifier

This paper presents the analysis and the experimental validation of an innovative high efficiency GaN-based wireless charging system for mobile phones, suitable in the automotive environment. The peculiarities of the power conversion system reside in the monolithic nature of the GaN full-bridge, on the transmitter side, and in the implementation of a hybrid self-driven rectifier, on the receiver side. Thanks to the new emerging technology, characterized by very low RD
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, an optimized converter with negligible conduction and switching losses is presented. The rectification block is realized by replacing two diodes of a traditional single-phase full-wave uncontrolled rectifier with two power switches and by implementing a self-driven structure. The proposed solution leads to a notable increase in the system power transfer efficiency with zero additional costs.