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Transmitting coil achieving uniform magnetic field distribution for planar wireless power transfer system

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4 Author(s)
Casanova, J.J. ; Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL ; Zhen Ning Low ; Jenshan Lin ; Ryan Tseng

A 20 cm by 20 cm transmitting coil is designed for an inductively-coupled power transfer system. The coil design is a spiral, whose geometry is optimized to ensure an even magnetic field distribution. This guarantees uniform power delivery regardless of recieving coil position. The transmitting coil is tested using Litz wire, a switchmode power amplifier, and a 6 cm by 8 cm recieving coil connected to a rectifier and a variable load. The system achieves a maximum efficiency of 80.9% and a maximum power delivery of 11.8 W. At a fixed load, the power delivery has a coefficient of variation of 2.2% as the recieving coil's position is varied on the transmitter. In general, the system efficiency is high and insensitive to receiver placement as well as loading conditions.

Published in:

Radio and Wireless Symposium, 2009. RWS '09. IEEE

Date of Conference:

18-22 Jan. 2009