A Novel Wireless Power Transfer System With Double Intermediate Resonant Coils

• Published in: IEEE transactions on industrial electronics (1982) Vol. 63; no. 4; pp. 2174 - 2180
• Main Authors: Liu, Xiaochang, Wang, Gaofeng
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: circuit model; Coils; Copper; Impedance; Inductance; Integrated circuit modeling; intermediate resonators; Resistance; tuning scheme; Wireless power transfer; Wires; wireless power transfer (WPT); intermediate resonators; Circuit model; tuning scheme
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2015.2510512

A novel wireless power transfer (WPT) system with double intermediate resonators is proposed. In addition to the power and load coils, this WPT system has four self-resonators: 1) a sending resonator; 2) a receiving resonator; and 3) two intermediate resonators. For optimal design, this WPT system is analyzed using an equivalent circuit model. In particular, a tuning scheme for coupling coefficients is proposed to determine optimal positions of the power and load self-resonators for maximizing the power transfer efficiency. The experiments show that the electric power can be wirelessly transferred to the receiving coil located at a distance of more than four times the resonator diameter away from the sending coil. The measured transfer efficiency of this WPT system is above 70%.