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Energies 2017, 10(9), 1437; https://doi.org/10.3390/en10091437

A High-Efficient Low-Cost Converter for Capacitive Wireless Power Transfer Systems

1
Department of Electrical Engineering, Myongji University, Yongin 17058, Korea
2
School of Computer Science and Engineering, Chung-Ang University, Seoul 06974, Korea
3
Department of Electronic Engineering, Myongji University, Yongin 17058, Korea
*
Author to whom correspondence should be addressed.
Received: 19 August 2017 / Revised: 12 September 2017 / Accepted: 14 September 2017 / Published: 18 September 2017
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

Growth of the Internet of Things (IoT) spurs need for new ways of delivering power. Wireless power transfer (WPT) has come into the spotlight from both academia and industry as a promising way to power the IoT devices. As one of the well-known WPT techniques, the capacitive power transfer (CPT) has the merit of low electromagnetic radiation and amenability of combined power and data transfer over a capacitive interface. However, applying the CPT to the IoT devices is still challenging in reality. One of the major issues is due to the small capacitance of the capacitive interface, which results in low efficiency of the power transfer. To tackle this problem, we present a new step-up single-switch quasi-resonant (SSQR) converter for the CPT system. To enhance the CPT efficiency, the proposed converter is designed to operate at low frequency and drive small current into the capacitive interfaces. In addition, by eliminating resistor-capacitor-diode (RCD) snubber in the converter, we reduce the implementation cost of the CPT system. Based on intensive experimental work with a CPT system prototype that supports maximum 50 W (100 V/0.5 A) power transfer, we demonstrate the functional correctness of the converter that achieves up to 93% efficiency. View Full-Text
Keywords: capacitive wireless power transfer; single-switch quasi-resonant converter; wireless power transfer efficiency; low cost power transfer capacitive wireless power transfer; single-switch quasi-resonant converter; wireless power transfer efficiency; low cost power transfer
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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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Lee, I.-O.; Kim, J.; Lee, W. A High-Efficient Low-Cost Converter for Capacitive Wireless Power Transfer Systems. Energies 2017, 10, 1437.

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