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Energies 2016, 9(7), 491; doi:10.3390/en9070491

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

School of Electrical Engineering, Wuhan University, 299 Bayi Road, Wuchang, Wuhan 430072, China
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Author to whom correspondence should be addressed.
Academic Editor: Hongjian Sun
Received: 1 May 2016 / Revised: 19 June 2016 / Accepted: 20 June 2016 / Published: 27 June 2016
(This article belongs to the Special Issue Wireless Power Transfer 2016)
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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. View Full-Text
Keywords: wireless power transfer (WPT); close coupling; self-oscillation; Hamel locus; frequency-splitting; synchronous tuning wireless power transfer (WPT); close coupling; self-oscillation; Hamel locus; frequency-splitting; synchronous tuning
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hu, P.; Ren, J.; Li, W. Frequency-Splitting-Free Synchronous Tuning of Close-Coupling Self-Oscillating Wireless Power Transfer. Energies 2016, 9, 491.

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