Magnetic Field Shielding Optimization Based on Wireless Charging

2020 ◽  
Author(s):  
Xuguang Liu ◽  
Kechen Wu ◽  
Rui Wang ◽  
Zhengwei Pan ◽  
Erxian Yao
Keyword(s):  
Magnetic Field ◽  
Wireless Charging

Investigating flexible textile-based coils for wireless charging wearable electronics

2019 ◽  
Vol 50 (3) ◽  
pp. 333-345 ◽  
Author(s):  
Danmei Sun ◽  
Meixuan Chen ◽  
Symon Podilchak ◽  
Apostolos Georgiadis ◽  
Qassim S Abdullahi ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Electrical Conductivity ◽  
Electromagnetic Field ◽  
Electric Field ◽  
Dimensional Stability ◽  
Screen Printing ◽  
Wearable Electronics ◽  
Wireless Charging ◽  
The Magnetic Field ◽  
Screen Printed

Smart and interactive textiles have been attracted great attention in recent years. This research explored three different techniques and processes in developing textile-based conductive coils that are able to embed in a garment layer. Coils made through embroidery and screen printing have good dimensional stability, although the resistance of screen printed coil is too high due to the low conductivity of the print ink. Laser cut coil provided the best electrical conductivity; however, the disadvantage of this method is that it is very difficult to keep the completed coil to the predetermined shape and dimension. The tested results show that an electromagnetic field has been generated between the textile-based conductive coil and an external coil that is directly powered by electricity. The magnetic field and electric field worked simultaneously to complete the wireless charging process.

scholarly journals Comparison of Magnetic Field Emission from Unipolar and Bipolar Coil-Based Wireless Charging Systems

2020 ◽  
Author(s):  
Mostak Mohammad ◽  
Jason L. Pries ◽  
Omer C. Onar ◽  
Veda P. Galigekere ◽  
Gui-Jia Su ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Field Emission ◽  
Wireless Charging

Magnetic field exposure to wireless charging stations for mobile phones

2017 ◽  
Vol 39 (1) ◽  
pp. 83-85
Author(s):  
Jürg Fröhlich ◽  
Marco Zahner ◽  
Gregor Dürrenberger
Keyword(s):  
Magnetic Field ◽  
Mobile Phones ◽  
Wireless Charging ◽  
Field Exposure ◽  
Magnetic Field Exposure ◽  
Charging Stations

scholarly journals Radar-based living object protection for inductive charging of electric vehicles using two-dimensional signal processing

2017 ◽  
Vol 4 (2) ◽  
pp. 88-97 ◽  
Author(s):  
Tim Poguntke ◽  
Philipp Schumann ◽  
Karlheinz Ochs
Keyword(s):  
Magnetic Field ◽  
Signal Processing ◽  
Electric Vehicles ◽  
Measurement Data ◽  
Air Gap ◽  
Two Dimensional ◽  
Wireless Charging ◽  
Automotive Radar ◽  
Increasing Demand ◽  
Processing Techniques

As battery capacities become suitable for the mass market, there is an increasing demand on technologies to charge electric vehicles. Wireless charging is regarded as the most promising technique for automatic and convenient charging. Especially in publicly accessible parking spaces, foreign objects are able to enter the large air gap between the charging coils easily. Since the evoked magnetic field does not meet regulations, wireless charging systems are demanded to take further precautions related to the protection of endangered objects. Thus, additional sensors are required to protect primarily living objects by preventing them from being exposed to the magnetic field. In this paper, we propose a new approach for monitoring the air gap under the vehicle underbody using an automotive radar sensor on the vehicle side. The concept feasibility is evaluated with the help of a prototypical implementation. Further, two-dimensional signal processing techniques are applied to meet the requirements of inductive charging systems. Consequently, this paper provides measurement data for relevant use cases frequently discussed in the community of inductive charging.

scholarly journals Design of Magnetic Coupler for Wireless Power Transfer

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 3000 ◽  
Author(s):  
Heqi Xu ◽  
Chunfang Wang ◽  
Dongwei Xia ◽  
Yunrui Liu
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Interference ◽  
Coupling Efficiency ◽  
Transmission Efficiency ◽  
Simulation Software ◽  
Good Effect ◽  
Wireless Charging ◽  
Magnetic Shield ◽  
Element Simulation ◽  
The Stability

In order to improve the restraint ability of electromagnetic energy in space and improve the coupling efficiency, a magnetic coupler structure with composite magnetic shield is proposed. Firstly, the model is established by using the finite-element simulation software. Then, according to the limit of public exposure to time-varying electromagnetic fields pointed out in ICNIPR (International Commission on Non-Ionizing Radiation Protection) guidelines, the characteristics and spatial magnetic field distribution of magnetic couplers with a single shielding structure, double shielding structure, and composite shielding structure are compared and analyzed. Finally, the experimental results show that the structure of magnetic couplers with a composite magnetic shield has a good effect in strengthening magnetic field concentration and reducing the electromagnetic interference of wireless charging systems to the external environment. It also has the advantages of smaller volume, lighter weight, and lower cost, and can effectively improve the transmission efficiency and enhance the stability of wireless charging systems.

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