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| Foreign objects detection methodbased on impedance characteristics for EV wireless charging systems |
| Tang Chunsen1, Zhong Liangliang2, Wu Xin’gang3, Su Bingke1, Zhong Mingxiang2 |
1. Automation College of Chongqing University, Chongqing 400044;
2. State Grid Nsingbo Power Company, Ningbo, Zhejiang 315000;
3. Beijing Zhixin Microelectronic Technology Co., Ltd, Beijing 102200 |
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Abstract Aimed at the detection of metal and living objects in wireless charging system, this paper proposes a detecting method based on impedance variation characteristics, analyzing the change of coil impedance and the influence of metal objects on coil magnetic field distribution and living objects on the parasitic parameters. In this paper, the coil impedance variation characteristics resulting from different types of foreign objects are analyzed in detail, results are verified by a mass of experiment data, and based on which, the regular patterns of impedance variation characteristics corresponding to foreign objects of different types and sizes are summarized. The method proposed has the advantages of low-cost, impressive effect, and stability and is able to distinguish the types and sizes of foreign objects, thus making the wireless charging system deal with foreign objects in a more optimized way.
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Received: 30 November 2017
Published: 19 June 2018
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2018, Vol. 19 
