Compact magnetic coupled resonator with high efficiency during misaligned wireless power transmission

Abstract

A compact and high efficient magnetic coupled resonator that uses additional parallel capacitors is presented. The proposed resonators are used as a transmitter (TX) and receiver (RX) for a magnetic coupled wireless power transmission. Compared with a conventional magnetic coupled resonator, the resonator’s size is effectively decreased and the efficiency is increased by the additional capacitor at long distances. Interestingly, the proposed wireless power transmission system shows increased efficiency even when the axis between the TX and RX is misaligned, in contrast to with the conventional one. The proposed resonator has 88% maximum efficiency at a distance of 45 cm, and maintains 80% efficiency up to 25 cm offset.

Keywords:

• wireless power transmission
• magnetic resonance
• compact resonator
• misalignment

Acknowledgments

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF), funded by the Ministry of Education, Science and Technology (No. 2010-0004315).