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.
Highlights
The rise of the Internet of Things (IoT) has been undergoing a paradigm shift on powering electronic devices
Due to the implementation difficulty of capacitive power transfer (CPT) systems being suitable for such small IoT devices, we focus on demonstrating the feasibility of the proposed converter design implemented with the board-level CPT prototype
The most CPT converters suffer from the small capacitance of the capacitive interface, which makes the CPT converters operate at high resonant frequency and have high equivalent series resistance (ESR), operating with low efficiency
Summary
The rise of the Internet of Things (IoT) has been undergoing a paradigm shift on powering electronic devices. Applying the CPT system to IoT devices is still challenging, mainly due to its low efficiency of the power transfer This is, out of scope in this paper.) Because the primary concern of IoT devices has become energy efficiency [17], the low efficient. The small capacitance of the capacitive interface requires an equipped CPT converter to operate at high resonant frequency, which results in significant increase of switching power loss.
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