Optimization of Resonant Capacitance in Wireless Power Transfer System with 3-D Stacked Two Receivers

Shusuke YANAGAWA  Ryota SHIMIZU  Mototsugu HAMADA  Toru SHIMIZU  Tadahiro KURODA  

IEICE TRANSACTIONS on Electronics   Vol.E101-C   No.7   pp.488-492
Publication Date: 2018/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E101.C.488
Type of Manuscript: BRIEF PAPER
wireless power transfer,  multiple receivers,  efficiency,  crosstalk,  

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This paper describes a top-down design methodology to optimize resonant capacitance in a wireless power transfer system with 3-D stacked two receivers. A 1:2 selective wireless power transfer is realized by a frequency/time division multiplexing scheme. The power transfer function is analytically formulated and the optimum tuning capacitance is derived, which is validated by comparing with system simulation results. By using the optimized values, power transfer efficiencies at 6.78MHz and 13.56MHz are simulated to be 80% and 84%, respectively, which are <3% worse than a conventional wireless power transfer system.