Efficient Wireless Power Transfer via Magnetic Resonance Coupling Using Automated Impedance Matching Circuit

In this paper, an automated impedance matching circuit is proposed to match the impedance of the transmit and receive resonators for optimum wireless power transfer (WPT). This is achieved using a 2D open-circuited spiral antenna with magnetic resonance coupling in the low-frequency ISM band at 13.56 MHz. The proposed WPT can be adopted for a wide range of commercial applications, from electric vehicles to consumer electronics, such as tablets and smartphones. The results confirm a power transfer efficiency between the transmit and receive resonant circuits of 92%, with this efficiency being sensitive to the degree of coupling between the coupled pair of resonators.

Automated summary

An automated impedance matching circuit is proposed in this paper for optimal wireless power transfer, utilizing 2D open-circuited spiral antenna with magnetic resonance coupling in the low-frequency ISM band. The proposed technology can be widely applied in commercial applications, with the results confirming high power transfer efficiency between the transmit and receive resonant circuits when there is a high degree of coupling between the resonators.