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Journal of ZheJiang University (Engineering Science)  2022, Vol. 56 Issue (1): 56-62    DOI: 10.3785/j.issn.1008-973X.2022.01.006
    
Metal object detection method in wireless electric vehicle charging system
Kai DU1(),Guo-rong ZHU1,Jiang-hua LU2,*(),Mu-ye PANG1
1. School of Automation, Wuhan University of Technology, Wuhan 430070, China
2. School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
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Abstract  

A foreign object detection coil array that does not affect the power transmission capacity of the wireless power transmission (WPT) system and has no detection blind spots was proposed in view of the problem that metal foreign objects falling into the charging area of electric vehicles affect the electrical characteristics of the system and generate eddy current heating in order to ensure the safety and reliability of the WPT system. The detection coil resonance circuit and control circuit were designed to improve detection sensitivity and accuracy. An electric vehicle WPT system experimental prototype with metal foreign body detection function was built, and the effectiveness and feasibility of the detection method through more than ten common metal foreign bodies were verified. The test results verified that the output voltage of the detection circuit had obvious changes by removing the cans, paper clips and coins from the detection coil. The size and material of various metal foreign objects were different, and the output voltage change rate was different. The effectiveness of the proposed metal foreign body detection method was verified.



Key wordswireless power transfer      electric vehicle      eddy current      metal object detection     
Received: 23 June 2021      Published: 05 January 2022
CLC:  TM 724  
Corresponding Authors: Jiang-hua LU     E-mail: Dddduk@outlook.com;jianghualu@wust.edu.cn
Cite this article:

Kai DU,Guo-rong ZHU,Jiang-hua LU,Mu-ye PANG. Metal object detection method in wireless electric vehicle charging system. Journal of ZheJiang University (Engineering Science), 2022, 56(1): 56-62.

URL:

https://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2022.01.006     OR     https://www.zjujournals.com/eng/Y2022/V56/I1/56


电动汽车无线充电系统金属异物检测方法

为了保证无线电能传输(WPT)系统的安全可靠性,针对金属异物掉落电动汽车充电区域影响系统电气特性和产生涡流发热的问题,提出不影响WPT系统功率传输能力且无检测盲点的异物检测线圈阵列. 设计检测线圈谐振电路和控制电路,提高检测敏感度和准确度. 搭建具有金属异物检测功能的电动汽车WPT系统实验样机,通过多种常见金属异物验证检测方法的有效性和可行性. 经实验验证可知,从检测线圈上移除易拉罐、回形针和硬币等,检测电路输出电压均有明显的变化,各种金属异物的尺寸及材质各不相同,输出电压变化率存在差异,验证了提出的金属异物检测方法的有效性.


关键词: 无线电能传输,  电动汽车,  涡流,  金属异物检测 
Fig.1 Archimedes spiral inductance coil
Fig.2 Archimedes spiral inductor coil equivalent circuit
Fig.3 Design rules of metal foreign body detection coil
Fig.4 Detection coil resonance circuit
Fig.5 Metal foreign body detection circuit
Fig.6 Detection coil control logic
Fig.7 Detection coil control circuit
Fig.8 Timing control logic of metal foreign body detection circuit
Fig.9 3.3 kW experimental prototype of electric vehicle WPT system
Fig.10 Control signal experimental waveform of foreign body detection circuit
Fig.11 Test results of foreign body detection circuit output voltage
异物 Vg/%
25美分硬币 25.6
5美分硬币 21.4
1美分硬币 15.8
钥匙 31.3
铝片(3 cm×3 cm) 37.8
铜片(3 cm×3 cm) 41.2
螺母 4.7
螺栓 5.3
易拉罐 80.7
钢丝球 26.6
回形针 3.6
锡箔纸(2 cm×2 cm) 34.5
铁钉 4.2
Tab.1 Impact of more than ten common metal foreign objects on output voltage of detection circuit
Fig.12 Test results of detecting output voltage of coil resonance circuit
[1]   赵争鸣, 刘方, 陈凯楠 电动汽车无线充电技术研究综述[J]. 电工技术学报, 2016, 31 (20): 30- 40
ZHAO Zheng-ming, LIU Fang, CHEN Kai-nan Overview of research on wireless charging technology for electric vehicles[J]. Transactions of the China Electrotechnical Society, 2016, 31 (20): 30- 40
doi: 10.3969/j.issn.1000-6753.2016.20.003
[2]   程时杰, 陈小良, 王军华, 等 无线输电关键技术及其应用[J]. 电工技术学报, 2015, 30 (19): 68- 84
CHENG Shi-jie, CHEN Xiao-liang, WANG Jun-hua, et al Key wireless power transmission technologies and their applications[J]. Transactions of the China Electrotechnical Society, 2015, 30 (19): 68- 84
doi: 10.3969/j.issn.1000-6753.2015.19.011
[3]   范兴明, 莫小勇, 张鑫 无线电能传输技术的研究现状与应用[J]. 中国电机工程学报, 2015, 35 (10): 2584- 2600
FAN Xing-ming, MO Xiao-yong, ZHANG Xin Research status and application of wireless power transmission technology[J]. Proceedings of the Chinese Society of Electrical Engineering, 2015, 35 (10): 2584- 2600
[4]   ZHANG Zhen, PANG Hong-liang, GEORGIADIS A, et al Wireless power transfer: an overview[J]. IEEE Transactions on Industrial Electronics, 2019, 66 (2): 1044- 1058
doi: 10.1109/TIE.2018.2835378
[5]   汤欣宁. 无线充电装置中金属异物检测技术研究[D]. 哈尔滨: 哈尔滨工业大学, 2020.
TANG Xin-ning. Research on metal foreign body detection technology in wireless charging devices [D]. Harbin: Harbin Institute of Technology, 2020.
[6]   苏玉刚, 侯信宇, 戴欣 磁耦合无线电能传输系统异物检测技术综述[J]. 中国电机工程学报, 2021, 41 (2): 715- 728
SU Yu-gang, HOU Xin-yu, DAI Xin Overview of foreign body detection technology in magnetic coupling WPT system[J]. Proceedings of the Chinese Society of Electrical Engineering, 2021, 41 (2): 715- 728
[7]   周博. 无线充电系统对位及异物检测研究[D]. 济南: 山东大学, 2018.
ZHOU Bo. Research on wireless charging system alignment and foreign body detection [D]. Jinan: Shandong University, 2018.
[8]   秦庆磊, 张昌州, 王中训. 无线电能传输系统金属异物检测方法研究[EB/OL]. [2021-10-22]. http://kns.cnki.net/kcms/detail/12.1420.TM.20201020.1731.004.html.
QIN Qing-lei, ZHANG Chang-zhou, WANG Zhong-xun. Research on the detection method of metal foreign objects in wireless power transmission system [EB/OL]. [2021-10-22]. http://kns.cnki.net/kcms/detail/12.1420.TM.20201020.1731.004.html.
[9]   王跃跃. 基于感应电压的无线充电异物检测系统设计[D]. 上海: 上海电力大学, 2020.
WANG Yue-yue. Design of wireless charging foreign body detection system based on induced voltage [D]. Shanghai: Shanghai Electric Power University, 2020.
[10]   ZHANG Yi-ming, YAN Zheng-chao, ZHU Jia-qi, et al. A review of foreign object detection (FOD) for inductive power transfer systems [EB/OL]. [2021-05-15]. https://doi.org/10.1016/j.etran.2019.04.002.
[11]   THAI V X, JANG G C, JEONG S Y, et al Symmetric sensing coil design for the blind-zone free metal object detection of a stationary wireless electric vehicles charger[J]. IEEE Transactions on Power Electronics, 2020, 35 (4): 3466- 3477
doi: 10.1109/TPEL.2019.2936249
[12]   THAI V X, PARK J H, JEONG S Y, et al Equivalent-circuit-based design of symmetric sensing coil for self-inductance-based metal object detection[J]. IEEE Access, 2020, 8: 94190- 94203
doi: 10.1109/ACCESS.2020.2995210
[13]   HALL K L, MORRIS P K, RON F, et al. Vehicle charger safety system and method: JP5893631B2 [P]. 2014-03-27.
[14]   GARCIA B A, GILBERT A M, OMBACH G. Methods and systems for object detection and sensing for wireless charging systems: US5732489.8 [P]. 2017-08-15.
[15]   HANSPETER W, LUKAS S, ANDREAS D, et al. Systems, methods, and apparatus for radar-based detection of objects in a predetermined space: KR20160135238A [P]. 2017-09-26.
[16]   IMURA T. Simple equivalent circuit model with foreign object on wireless power transfer via magnetic resonant coupling [C]// IEEE Conference on Antenna Measurements and Applications. Tsukuba: IEEE, 2017: 367-370.
[17]   WANG Yu-chuan, CHIANG Chao-wen. Foreign metal detection by coil impedance for EV wireless charging system [C]// EVS28 International Electric Vehicle Symposium Exhibition. Goyang, Korea: KINTEX, 2015: 3-6.
[18]   JEONG S Y, LEE E S, PARK C B, et al. Influences of spurious conductors on long distance inductive power transfer systems [C]// IEEE 79th Vehicular Technology Conference. Seoul: IEEE, 2014: 1-5.
[19]   HUANG Shyh-jier, SU Jun-li, DAI Shuo-huei, et al. Enhancement of wireless power transmission with foreign-object detection considerations [C]// IEEE 6th Global Conference on Consumer Electronics. Nagoya: IEEE, 2017: 1-2.
[20]   The Qi wireless power transfer system power class 0 specification: reference designs, wireless power consortium, Feb. 2017, parts 1 and 2: interface definition version 1.2. 2[EB/OL]. [2018-04-07]. https://www.wirelesspowerconsortium.com/developers/specification.html.
[21]   FUKUDA S, NAKANO H, MURAYAMA Y, et al. A novel metal detector using the quality factor of the secondary coil for wireless power transfer systems [C]// IEEE MTTS International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications. Kyoto: IEEE, 2012: 241-244.
[22]   林天化. 金属异物对无线电能传输性能的影响及检测研究[D]. 哈尔滨: 哈尔滨工业大学, 2019.
LIN Tian-hua. The influence of metal foreign bodies on the performance of wireless power transmission and its detection [D]. Harbin: Harbin Institute of Technology, 2019.
[23]   金耀. 电动汽车无线充电耦合机构金属异物检测方法研究[D]. 天津: 天津工业大学, 2019.
JIN Yao. Research on the detection method of metal foreign objects in the wireless charging coupling mechanism of electric vehicles [D]. Tianjin: Tianjin Polytechnic University, 2019.
[24]   何谋. 无线电能传输系统中异物检测技术的研究与应用[D]. 福州: 福州大学, 2018.
HE Mou. Research and application of foreign matter detection technology in wireless power transmission system [D]. Fuzhou: Fuzhou University, 2018.
[25]   张献, 付志远, 薛明, 等 无线电能传输阵列式差分线圈金属异物检测方法[J]. 电工电能新技术, 2020, 39 (11): 9- 17
ZHANG Xian, FU Zhi-yuan, XUE Ming, et al Detection method of metal foreign body in wireless power transmission array differential coil[J]. Advanced Technology of Electrical Engineering and Energy, 2020, 39 (11): 9- 17
[26]   JEONG S Y, KWAK H G, JANG G C, et al Dual purpose nonoverlapping coil sets as metal object and vehicle position detections for wireless stationary EV chargers[J]. IEEE Transactions on Power Electronics, 2018, 33 (9): 7387- 7397
doi: 10.1109/TPEL.2017.2765521
[27]   JEONG S Y, THAI V X, PARK J H Self-inductance-based metal object detection with mistuned resonant circuits and nullifying induced voltage for wireless EV chargers[J]. IEEE Transactions on Power Electronics, 2019, 34 (1): 748- 758
doi: 10.1109/TPEL.2018.2813437
[28]   XIANG L, ZHU Z, TIAN J, et al Foreign object detection in a wireless power transfer system using symmetrical coil sets[J]. IEEE Access, 2019, 7: 44622- 44631
doi: 10.1109/ACCESS.2019.2908866
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