scholarly journals A Metal Object Detection System with Multilayer Detection Coil Layouts for Electric Vehicle Wireless Charging

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2960 ◽  
Author(s):  
Bo Cheng ◽  
Jianghua Lu ◽  
Yiming Zhang ◽  
Guang Pan ◽  
Rakan Chabaan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Object Detection ◽  
Wireless Charging ◽  
Power Transfer ◽  
Metal Object ◽  
Inductive Power Transfer ◽  
The Magnetic Field ◽  
Blind Spots ◽  
Detection Coil ◽  
Inductive Power

Non-radiative inductive power transfer is one of the most studied and commercially applied wireless charging technologies, where the magnetic field is employed as the medium for power transfer. In the wireless charging of electric vehicles, the strong magnetic field will heat up any metal items falling in the charging area due to eddy current induced in the metal objects, causing hazards like fire. Metal object detection (MOD) is necessary for the market penetration of inductive power transfer technology. This paper aims to improve the performance of systems that detect metal objects based on inductance variations. Two novel multi-layer detection coil layouts are proposed, which can not only cover the entire charging area without blind spots but can also be decoupled from the transmitter and receiver to minimize the influence of the magnetic field that is used for power transfer. Two mixed resonant circuits are proposed and proven to have better performance than parallel and series resonance. The impacts of the detection coil layer, trace width, and turn-number are investigated. The test results indicate that the MOD system can detect one-cent coins at various positions of the detection coil printed circuit board, and can also detect various inductance variations without blind spots in the processing circuit.

Metal object detection for electric vehicle inductive power transfer systems based on hyperspectral imaging

Measurement ◽  
2021 ◽  
Vol 168 ◽  
pp. 108493
Author(s):  
Yong Tian ◽  
Zheng Li ◽  
Yawen Lin ◽  
Lijuan Xiang ◽  
Xiaoyu Li ◽  
...  
Keyword(s):  
Object Detection ◽  
Electric Vehicle ◽  
Hyperspectral Imaging ◽  
Power Transfer ◽  
Metal Object ◽  
Inductive Power Transfer ◽  
Inductive Power

Using Sensing Coils to Detect and Correct Lateral Misalignments in an Inductive Power-Transfer Wireless Charging System

2017 ◽  
Author(s):  
Ivan Cortes ◽  
Won-jong Kim
Keyword(s):  
Consumer Products ◽  
Wireless Charging ◽  
Power Transfer ◽  
Wireless Power ◽  
Inductive Power Transfer ◽  
Charging System ◽  
Field Symmetry ◽  
Electrical Transformers ◽  
Efficient Power ◽  
Inductive Power

Inductive power transfer (IPT) remains one of the most common ways to achieve wireless power transfer (WPT), operating on the same electromagnetic principle as electrical transformers but with an air core. IPT has recently been implemented in wireless charging of consumer products such as smartphones and electric vehicles. However, one major challenge with using IPT remains ensuring precise alignment between the transmitting and receiving coils so that maximum power transfer can take place. In this paper, the use of additional sensing coils to detect and correct lateral misalignments in an IPT systems is modeled and tested. The sensing coils exploit magnetic-field symmetry to give a nonlinear measure of misalignment direction and magnitude. Experiments using such sensing coils give a misalignment-sensing resolution of less than 1 mm when applied to a common smartphone wireless charging system. Voltage readings from the sensing coils are used for feedback control of an experimental two-dimensional coil positioner. This system is able to reduce lateral misalignments to less than 2 mm in real time, allowing for efficient power transfer. The results of this experiment give confidence that similar sensing coils can be used to reduce lateral misalignments in scaled IPT systems, such as electric-vehicle wireless chargers.

scholarly journals Technological inductive power transfer systems

2017 ◽  
Vol 68 (3) ◽  
pp. 235-244 ◽  
Author(s):  
Nikolay D. Madzharov ◽  
Valentin S. Nemkov
Keyword(s):  
Magnetic Field ◽  
Industrial Application ◽  
Design Principles ◽  
Power Transfer ◽  
Review Of Literature ◽  
Main Attention ◽  
Inductive Power Transfer ◽  
Design And Implementation ◽  
Continuous Power ◽  
Inductive Power

Abstract Inductive power transfer is a very fast expanding technology with multiple design principles and practical implementations ranging from charging phones and computers to bionic systems, car chargers and continuous power transfer in technological lines. Only a group of devices working in near magnetic field is considered. This article is devoted to overview of different inductive power transfer (IPT) devices. The review of literature in this area showed that industrial IPT are not much discussed and examined. The authors have experience in design and implementation of several types of IPTs belonging to wireless automotive chargers and to industrial application group. Main attention in the article is paid to principles and design of technological IPTs

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