Resonance Tuning in Wireless Energy Transfer System

Abstract

The most suitable method for achieving highly efficient wireless energy transfer for battery charging has been shown to be the resonant inductive connection. However, the performance of this method is dependent on the magnetic coupling and load circumstances, which cause the system’s resonant frequency to shift. This study describes the design and development of a viable 2-coil Wireless Energy Transfer prototype that transmits data at the same time. The energy transfer and data transmission occur at two very distinct frequencies. The energy transfer occurs at tens of kHz and the data transmission, at 2.4 GHz. The resonant inductive coupling is the aim of the operation of the prototype. The communication that is maintained in the system, and the application software that is built, allow the prototype to tune its operation frequency, in relation to the varying resonance, achieving a higher efficiency of the system. The general architecture of the system was chosen as a downscaled model for the future practical application, e.g. for charging stations, connected through Internet of Things (IoT) technologies.