A Simultaneous Wireless Power and Coil Inductance Insensitive Data Transfer System for Rotary Structures
Yuanshuang Fan, Hongsheng Hu, Yue Sun, Han Hu, Sihan Wu
Abstract
This article proposes a simultaneous wireless power and coil inductance-insensitive data transfer system for rotary structures. Power and data are transferred simultaneously via a pair of coupled coils, adopting frequency division multiplexing technology. The data carrier is injected into and extracted from the power transfer channel by inductors connected serially with the coupled coils and by multiplexing the compensation networks of the power transfer channel. The transfer gain of the data transfer channel is insensitive to the inductances of the coupled coils within a certain interval. <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCLC</i> compensation topology is proposed to realize constant voltage output and to filter the high-order harmonics out of the power transfer channel, reducing the total harmonic distortion and creating a favorable condition for simultaneous data transfer. The circuit model is built to analyze the power and data transfer performance, and the complex-frequency-domain model of the system is established to analyze the responses of power interference. Finally, the feasibility of the technology proposed is verified by a 300 W prototype with a data rate of 40 kbps.