Wireless power transfer integrated board for low power IoT applications

2017 IEEE Conference on Technologies for Sustainability (SusTech) Pub Date : 2017-11-01 DOI:10.1109/SUSTECH.2017.8333523

C. Pardue, A. Davis, M. Bellaredj, M. Swaminathan

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引用次数: 7

Abstract

IoT edge devices are of interest to sustainability research because of their support for low energy applications. This work focuses on a wireless power transfer (WPT) system at GHz frequency based on near field coupling (NFC) with a class E rectifier and DC-DC converter with power inductor, designed for loads in the mW range. The design is completed on an integrated board, allowing for integration of the WPT coils and power inductor on the circuit board with designed electrical characteristics. The WPT coils and class E rectifier are designed for maximum efficiency, minimizing the losses associated with high frequency, low power operation. A commercial off the shelf (COTS) buck converter is integrated into the architecture to fix the output voltage. The power inductor is fabricated with a Nickel Zinc ferrite epoxy composite screen printed on the top and bottom layer of the integrated board. The complete circuit design is fabricated and measured, with the total measured system efficiency peaking at 22.7% power efficiency at a WPT transmission distance of 2 mm.

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用于低功耗物联网应用的无线电力传输集成板

物联网边缘设备由于支持低能耗应用而引起可持续性研究的兴趣。本研究的重点是基于近场耦合(NFC)的GHz频率无线电力传输(WPT)系统，该系统具有E类整流器和带功率电感的DC-DC变换器，设计用于mW范围内的负载。该设计是在集成板上完成的，允许将WPT线圈和功率电感集成在电路板上，具有设计的电气特性。WPT线圈和E级整流器的设计是为了最大限度地提高效率，最大限度地减少与高频，低功率操作相关的损失。该架构集成了商用现货(COTS)降压转换器来固定输出电压。功率电感是用镍锌铁氧体环氧复合丝网印刷在集成板的顶层和底层。制作并测量了完整的电路设计，在WPT传输距离为2mm时，测量的系统总效率达到22.7%的功率效率峰值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2017 IEEE Conference on Technologies for Sustainability (SusTech)

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