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Appl. Sci. 2018, 8(7), 1131; https://doi.org/10.3390/app8071131

Capacitive Power Transfer System with Reduced Voltage Stress and Sensitivity

1
ASEM, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Fukuoka 816-8580, Japan
2
Department of Electrical and Computer Engineering, The University of Auckland, Auckland 1023, New Zealand
*
Author to whom correspondence should be addressed.
Received: 13 June 2018 / Revised: 30 June 2018 / Accepted: 9 July 2018 / Published: 12 July 2018
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Abstract

This paper introduces a DC–DC buck converter on the secondary side of the capacitive power transfer system to reduce the voltage and electric field across the interface, and to reduce the circuit Q, and thus the system sensitivity. The system is mathematically analyzed to study the improvement in sensitivity and voltage stress. The leakage electric field emissions around the plates are investigated by simulation. The analytical and simulation results show that by reducing the duty cycle of the buck converter at a constant output power, the voltage across the plates can be significantly reduced and the circuit becomes less sensitive to the variations in parameters. Experimental results demonstrated that Q and the voltage stress over the capacitive interface are reduced by changing the duty cycle of the buck converter. For delivering 10 W of power, the maximum voltage stress across one pair of the coupling plates is reduced from 211 V in the conventional system without using a DC–DC converter, to 65 V and 44 V at duty cycles of 30% and 20%, respectively. The system achieves an end-to-end power efficiency of 80% at an output power of 10 W and a duty cycle of 30%. View Full-Text
Keywords: capacitive wireless power transfer; DC–DC buck converter; quality factor; voltage stress; wireless power transmission capacitive wireless power transfer; DC–DC buck converter; quality factor; voltage stress; wireless power transmission
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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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Mostafa, T.M.; Bui, D.; Muharam, A.; Hattori, R.; Hu, A.P. Capacitive Power Transfer System with Reduced Voltage Stress and Sensitivity. Appl. Sci. 2018, 8, 1131.

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