scholarly journals Improved Calculation Method of Coupling Factors for Low-Frequency Wireless Power Transfer Systems

2021 ◽  
Vol 19 (1) ◽  
pp. 44
Author(s):  
Jangyong Ahn ◽  
Seon-Eui Hong ◽  
Haerim Kim ◽  
Kyunghwan Song ◽  
Hyung-Do Choi ◽  
...  
Keyword(s):  
Human Body ◽  
Calculation Method ◽  
Low Frequency ◽  
Wireless Power Transfer ◽  
International Electrotechnical Commission ◽  
Internal Electric Field ◽  
Power Transfer ◽  
Wireless Power ◽  
Coupling Factors ◽  
Human Body Models

The concept of a coupling factor was introduced in International Electrotechnical Commission (IEC) 62311 and 62233 to provide a product safety assessment that considers the localized exposure when an electromagnetic field (EMF) source is close to the human body. To calculate the coupling factors between the human body and EMF source, a numerical calculation should be carried out to calculate the internal quantities of the human body models. However, at frequencies below 10 MHz, the computed current density or internal electric field has computational artifacts from segmentation or discretization errors. Specifically, coupling factors are calculated based on the maximum values, which may include computational artifacts due to abnormal peaks. In this study, we propose an improved calculation method to remove computational artifacts by applying the 99.99th percentile in calculating the coupling factors without underestimation. The performance of the proposed method is verified through a comparison based on various human body models with wireless power transfer (WPT) systems and compliance with the reference levels and basic restrictions. The results indicate that the proposed method can provide uniform coupling factors by reducing the computational errors by up to 65.3% compared to a conventional method.

scholarly journals Optimization of the Alignment Method for an Electric Vehicle Magnetic Field Wireless Power Transfer System Using a Low-Frequency Ferrite Rod Antenna

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4689 ◽  
Author(s):  
Jae Yong Seong ◽  
Sang-Sun Lee
Keyword(s):  
Magnetic Field ◽  
Electric Vehicle ◽  
Low Frequency ◽  
Wireless Power Transfer ◽  
International Electrotechnical Commission ◽  
Power Transfer ◽  
Wireless Power ◽  
Optimal Arrangement ◽  
Positioning Method ◽  
Secondary Device

The establishment of international and regional standards for electric vehicle (EV) magnetic field wireless power transfer (MF-WPT) systems started in 2010 by the Society of Automotive Engineers (SAE). In the meantime, the EV MF-WPT standardization has been focused on primary device and secondary device topology. Recently, the International Organization for Standardization (ISO), the International Electrotechnical Commission (IEC), and SAE have begun describing the communication and alignment techniques for EV MF-WPT. In this paper, we present a fine positioning method using a low-frequency (LF) signal, as mentioned in IEC 61980 and SAE J2954. Through modeling and simulation, we optimized a LF ferrite rod antenna (FRA) for EV MF-WPT fine positioning. We also found the optimal arrangement of LF-FRAs on primary device and secondary device Finally, we used a test bench to experiment and check the results of our proposal.

scholarly journals A Study of Wearable Wireless Power Transfer Systems on the Human Body

2020 ◽  
pp. 1-1
Author(s):  
Juan Barreto ◽  
Gianfranco Perez ◽  
Abdul-Sattar Kaddour ◽  
Stavros V. Georgakopoulos
Keyword(s):  
Human Body ◽  
Wireless Power Transfer ◽  
Power Transfer ◽  
Wireless Power

scholarly journals A Bioresorbable Magnetically Coupled System for Low‐Frequency Wireless Power Transfer

2019 ◽  
Vol 29 (46) ◽  
pp. 1905451 ◽  
Author(s):  
Qinglei Guo ◽  
Jahyun Koo ◽  
Zhaoqian Xie ◽  
Raudel Avila ◽  
Xinge Yu ◽  
...  
Keyword(s):  
Low Frequency ◽  
Wireless Power Transfer ◽  
Coupled System ◽  
Power Transfer ◽  
Wireless Power

EFFECT OF NUMBER OF TURNS AND MEDIUM BETWEEN COILS ON THE WIRELESS POWER TRANSFER EFFICIENCY OF AIMD’S

2019 ◽  
Vol 31 (02) ◽  
pp. 1950016
Author(s):  
B. P. Patil ◽  
Deepali Newaskar ◽  
Kunal Sharma ◽  
Tarun Baghmar ◽  
Mahesh Ku. Rajput
Keyword(s):  
Human Body ◽  
Wireless Power Transfer ◽  
Secondary Coil ◽  
Receiver Coil ◽  
Power Transfer ◽  
Wireless Power ◽  
Cardiac Pacemakers ◽  
Implantable Medical Devices ◽  
Body Tissues ◽  
Research Experiment

Active implantable medical devices (AIMDs) like implantable cardiac pacemakers play very important role in extending lives of patients with some cardiovascular diseases. The life of implantable device depends on life of battery. If this device can be charged from outside with power transfer device, then the cost of surgical procedures for patient can be saved. One must ensure, while transferring this power there should not be any abnormal effect on human body tissues. Wireless recharging of such devices through magnetic resonant coupling is of concern and hence the topic of more research to have uninterrupted supply from battery. The technique of wireless power transfer, primary or transmitting coil is assumed to be on body and receiver coil is assumed to be inside the human body. Several critical aspects need to be studied while designing coil for wireless power transfer (WPT). One of which is choice of operational frequency. In this research experiment, designed circuit is tested for checking power transfer was studied. Effect of the distance between primary and secondary coil affects the efficiency of power transfer. Authors also tied to test this for using different medium like air, placing 80 GSM paper and cloth. It is found that the medium between the primary and secondary affects the transfer of power. Careful thought needs to be given while designing power transfer system.

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