Maximum Efficiency Tracking for Wireless Power Transfer Systems With Dynamic Coupling Coefficient Estimation

Maximum efficiency tracking is an important issue for wireless power transfer (WPT) system. Traditional maximum efficiency tracking method normally focuses on load impedance matching with fixed coupling condition. However, WPT system is a loosely coupling system, the coupling coefficient varies due...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2018-06, Vol.33 (6), p.5005-5015
Main Authors: Dai, Xin, Li, Xiaofei, Li, Yanling, Hu, Aiguo Patrick
Format: Article
Language:English
Subjects:
Circuits
Coefficient of variation
Controllability
Coupling coefficient
Coupling coefficients
Couplings
Efficiency
Estimation
Impedance matching
Load matching
maximum efficiency tracking
Power efficiency
Rectifiers
Resistance
Tracking
Tracking control
Voltage control
wireless power transfer (WPT)
Wireless power transmission
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Summary:Maximum efficiency tracking is an important issue for wireless power transfer (WPT) system. Traditional maximum efficiency tracking method normally focuses on load impedance matching with fixed coupling condition. However, WPT system is a loosely coupling system, the coupling coefficient varies due to relative movement between the primary and secondary sides. Unknown to this variation may result in failure of the tracking. In this paper, a novel maximum efficiency tracking method is proposed with integrated dynamic coupling coefficient estimation. This method can take almost all requirements for maximum efficiency tracking into account including adaption for coupling coefficient and load variation, and output controllability. The tracking method is easy to implement because no additional circuitry or measurement is required. Experimental results have verified the correctness of the proposed coupling coefficient estimation method. And the maximum efficiency tracking results show the system can achieve a good performance against coupling coefficient and load variation with the proposed tracking method.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2729083