Self-Tuning WPT System With Constant Voltage Output Under Resonance Frequency Shift
Renjie Zhang, Huan Yuan, Mingzhe Rong, Wei Ke, Chenxu Liang, Jifeng Chu, Aijun Yang, Huang Wei-hua, Guobin Huang, Xiaohua Wang
Abstract
Automatic compensation techniques have become the research hotspots of wireless power transfer (WPT). In this article, a circuit with an automatic tuning function for WPT system is designed to maintain constant voltage under a shift in resonate frequencies. The proposed WPT system using <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC-S</i> topology with automatic tuning assist circuit (ATAC) shows better antioffset performance and output characteristics compared to the conventional <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC-S</i> topology. To make it easier to get the drive signal, ATAC's topological position is optimized. According to simulation and experiment results, more stable power and higher efficiency can be obtained by using <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC-S</i> topology for receivers under frequency shift conditions than conventional <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LCC-S</i> topology.