Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer

Po Hu, Jieshuai Ren and Wenan Li
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Po Hu: School of Electrical Engineering, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, China
Jieshuai Ren: School of Electrical Engineering, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, China
Wenan Li: School of Electrical Engineering, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, China

Energies, 2016, vol. 9, issue 7, 1-16

Abstract: The synchronous tuning of the self-oscillating wireless power transfer (WPT) in a close-coupling condition is studied in this paper. The Hamel locus is applied to predict the self-oscillating points in the WPT system. In order to make the system operate stably at the most efficient point, which is the middle resonant point when there are middle resonant and split frequency points caused by frequency-splitting, the receiver (RX) rather than the transmitter (TX) current is chosen as the self-oscillating feedback variable. The automatic delay compensation is put forward to eliminate the influence of the intrinsic delay on frequency tuning for changeable parameters. In addition, the automatic circuit parameter tuning based on the phase difference is proposed to realize the synchronous tuning of frequency and circuit parameters. The experiments verified that the synchronous tuning proposed in this paper is effective, fully automatic, and more robust than the previous self-oscillating WPT system which use the TX current as the feedback variable.

Keywords: wireless power transfer (WPT); close coupling; self-oscillation; Hamel locus; frequency-splitting; synchronous tuning (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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