期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 36, 期 7, 页码 7360-7365出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3043784
关键词
Resonant frequency; Harmonic analysis; Tuning; Couplings; Transmitters; Topology; Circuit topology; Coupling tolerance; dual-frequency tuning; hybrid compensation; square wave excitation; wireless power transfer (WPT)
资金
- Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid [2018TP1001]
- National Natural Science Foundation of China [61933011, 61903382]
- Natural Science Foundation of Hunan Province, China [2020JJ5722]
- CRRC Zhuzhou Electric Locomotive Institute Co., Ltd. [YJYJS2018-017]
This study presents a dual-frequency tuning method for improved coupling tolerance of an inductively coupled wireless power transfer system, and a dual-frequency hybrid compensation topology is designed to achieve suppression of output power variations against coupling changes.
This letter proposes a dual-frequency tuning method for improved coupling tolerance of an inductively coupled wireless power transfer (WPT) system by exploiting the fundamental and third-order harmonic components of a square-wave voltage out of a full-bridge inverter. A dual-frequency hybrid compensation topology is designed to simultaneously utilize the characteristics of series-series (SS) and LCL-S networks under the two different frequencies. Consequently, the output power of the proposed system under a fixed load is maintained approximately constant against coupling variations. A practical hybrid WPT system with a 100 kHz square-wave excitation and a 10.5 Omega resistive load is built to verify the theoretical modeling and analysis. Experimental results show that the system achieves an approximately constant output voltage and power of around 39 V and 150 W against a coupling coefficient variation from 0.52 to 0.72, with maximum fluctuations less than 5% and 10%, respectively.
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