Journal
IET POWER ELECTRONICS
Volume 9, Issue 15, Pages 2859-2864Publisher
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/iet-pel.2015.0376
Keywords
inductive power transmission; coils; resistors; magnetic resonance; frequency splitting suppression method; four-coil wireless power transfer system; magnetic resonant WPT system; wireless power charging; over-coupled regime; load resistor; input impedance equation; magnetic resonance coupling
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Funding
- National Natural Science Foundation of China [61573133, 51377001]
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Magnetic resonant wireless power transfer (WPT) is an emerging technology that may create new applications for wireless power charging. However, frequency splitting occurs when the WPT system operates in the over-coupled regime. As a result, the transfer efficiency is very low at the original resonant frequency. In this study, the method of adjusting the load resistor is proposed to suppress the frequency splitting. The efficiency and input impedance can be obtained by solving the system equivalent equations. In addition, the resonant frequencies can be obtained by input impedance equation. The influences of the load resistor on the efficiency and the resonant frequencies are analysed for different transfer distances. Then, the method of adjusting the load resistor is illustrated. Frequency splitting is suppressed and transfer efficiency is improved at the original resonant frequency by the proposed method. The WPT system via magnetic resonance coupling is designed. Simulation and experimental results validating the proposed method are given.
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