Metal object detection method in wireless electric vehicle charging system

doi:10.3785/j.issn.1008-973X.2022.01.006

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 words： wireless 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

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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.

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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

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


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