TY - JOUR
T1 - Safety Analysis of Long-Range and High-Power Wireless Power Transfer Using Resonant Beam
AU - Fang, Wen
AU - Deng, Hao
AU - Liu, Qingwen
AU - Liu, Mingqing
AU - Jiang, Qingwei
AU - Yang, Liuqing
AU - Giannakis, Georgios B.
N1 - Publisher Copyright:
© 1991-2012 IEEE.
PY - 2021
Y1 - 2021
N2 - Resonant Beam Charging (RBC) is a promising Wireless Power Transfer (WPT) technology to realize long-range and high-power charging for electronic devices. However, the safety mechanism of the RBC system has not been investigated so far. In this paper, we propose an analytical model based on electromagnetic field analysis for evaluating the performance of the RBC system with external object invasion, such as the benchmark for the WPT safety, irradiance on the invading object. For the RBC system with 5 m transmission distance and 1 W output electric power, the safety numerical analysis of radiation illustrates that the maximum irradiance on the invading object is 0.81 W/cm2, which is approximately 1/10 compared with 8.22 W/cm2 for the comparable laser charging system. Particularly, the peak irradiance on the invading object of the RBC system satisfies the Maximum Permissible Exposure (MPE) requirement for human skin, which is 1 W/cm2 in the standard 'Safety of Laser Products IEC 60825-1'. Hence, the RBC system can realize skin-safe WPT with Watt-level power over meter-level distance.
AB - Resonant Beam Charging (RBC) is a promising Wireless Power Transfer (WPT) technology to realize long-range and high-power charging for electronic devices. However, the safety mechanism of the RBC system has not been investigated so far. In this paper, we propose an analytical model based on electromagnetic field analysis for evaluating the performance of the RBC system with external object invasion, such as the benchmark for the WPT safety, irradiance on the invading object. For the RBC system with 5 m transmission distance and 1 W output electric power, the safety numerical analysis of radiation illustrates that the maximum irradiance on the invading object is 0.81 W/cm2, which is approximately 1/10 compared with 8.22 W/cm2 for the comparable laser charging system. Particularly, the peak irradiance on the invading object of the RBC system satisfies the Maximum Permissible Exposure (MPE) requirement for human skin, which is 1 W/cm2 in the standard 'Safety of Laser Products IEC 60825-1'. Hence, the RBC system can realize skin-safe WPT with Watt-level power over meter-level distance.
KW - Electromagnetic field analysis
KW - inherent safety
KW - resonant beam charging
KW - wireless power transfer
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U2 - 10.1109/TSP.2021.3076893
DO - 10.1109/TSP.2021.3076893
M3 - Article
AN - SCOPUS:85105869033
SN - 1053-587X
VL - 69
SP - 2833
EP - 2843
JO - IEEE Transactions on Signal Processing
JF - IEEE Transactions on Signal Processing
M1 - 9422160
ER -