A Loosely Coupled Planar Wireless Power System for Multiple Receivers
Casanova, J.J.; Zhen Ning Low; Jenshan Lin
Industrial Electronics, IEEE Transactions on
Volume 56, Issue 8, Aug. 2009 Page(s):3060 - 3068
Digital Object Identifier   10.1109/TIE.2009.2023633
Summary:Wireless power transfer is demonstrated mathematically and experimentally for M primary coils coupled to N secondary coils. Using multiple primary coils in parallel has advantages over a single primary coil. First, the reduced inductance of the transmitting coils makes the amplifier less sensitive to component variations. Second, with multiple receiving coils, the power delivery to an individual receiver is less sensitive to changes in the loads attached to other coils. By using a 16 cm by 18 cm primary and a 6 cm by 8 cm secondary coil, going from a 1:2 coupling to a 2:2 coupling, we show an increase in received power from 1.8 to 9.5 W, with only a small change in coupling efficiency. The advantages of the multiple primary coil topology increase the feasibility of charging multiple wireless portable devices simultaneously.

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