Metal Object Detection by Monitoring Fifth-Order Harmonic Current of IPT System With Dual Frequency Tuning

Autor:	Shaoge Zang, Bo Long, Aiguo Patrick Hu, Lei Zhao, Qi Zhu
Rok vydání:	2022
Předmět:	Physics Electromagnetic coil Harmonic Maximum power transfer theorem Inverter Fundamental frequency Electrical and Electronic Engineering Current (fluid) Topology Object detection Magnetic field
Zdroj:	IEEE Transactions on Power Electronics. 37:2513-2518
ISSN:	1941-0107 0885-8993
DOI:	10.1109/tpel.2021.3115588
Popis:	This letter proposes a Metal Object Detection (MOD) method by monitoring the 5th order harmonic current of a dual-frequency IPT system driven by a voltage-fed inverter with square-wave output. While power transfer is maintained by tuning at the fundamental frequency, the Tx circuit is tuned simultaneously at the 5th order frequency to ease the detection of the 5th order harmonic current for MOD. The Rx circuit is also fully tuned at the 5th order frequency, but the 5th order current is completely blocked. With the proposed dual-frequency tuning configuration, the presence of MO causes a significant drop in the 5th order harmonic current at the Tx side, while the Rx behaves as an open circuit with no effect on power transfer. Circuit and magnetic field simulation results show the 5th order harmonic current presents a unique response to the existence of MO, which is in good agreement with practical measurements. Experimental results demonstrate that at a constant 10W power output, both non-ferrous and ferrous MOs within the Tx charging area can be 100% detected, even when the Rx is misaligned by 50% of the Tx coil radius.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ac3a27c8c168bdd8e026f7ad33e92576 https://doi.org/10.1109/tpel.2021.3115588 Zobrazit plný text záznamu