Efficiency optimization using reconfigurable resonators for MR-WPT in laptop computers

In this paper, magnetic resonant wireless power transfer (MR-WPT) was studied, which is being raised for mobile devices, to improve transfer efficiency. We utilized an array of resonators, which is reconfigurable with pin-diode. It showed that the transfer efficiency can be optimized by controlling the status (Open/Short-mode) of the resonators along the transfer distance. The resonators were flat, with small size and characteristics suitable to design mobile devices. The transfer efficiency of the system was increased by 12%, averaging in transfer distance from 5 cm to 40 cm, and maintained higher than 30% in 40 cm distance. It is digitally controlled with pin-diodes in the practical mobile devices such as laptop, cell phone, and tablet PC.