Abstract
The scenario of multiple wireless power transfer (WPT) systems working closely, synchronously or asynchronously with phase difference often occurs in power supply for household appliances and electric vehicles in parking lots. Magnetic field leakage from the WPT systems is also varied due to unpredictable asynchronous working conditions. In this study, the magnetic field leakage from parallel WPT systems working with phase difference is predicted, and the induced electric field and specific absorption rate (SAR) in a human body standing in the vicinity are also evaluated. Computational results are compared with the restrictions prescribed in the regulations established to limit human exposure to time-varying electromagnetic fields (EMFs). The results show that the middle region between the two WPT coils is safer for the two WPT systems working in-phase, and the peripheral regions are safer around the WPT systems working anti-phase. Thin metallic plates larger than the WPT coils can shield the magnetic field leakage well, while smaller ones may worsen the situation. The orientation of the human body will influence the maximum magnitude of induced electric field and its distribution within the human body. The induced electric field centralizes in the trunk, groin, and genitals with only one exception: when the human body is standing right at the middle of the two WPT coils working in-phase, the induced electric field focuses on lower limbs. The SAR value in the lungs always seems to be greater than in other organs, while the value in the liver is minimal. Human exposure to EMFs meets the guidelines of the International Committee on Non-Ionizing Radiation Protection (ICNIRP), specifically reference levels with respect to magnetic field and basic restrictions on induced electric fields and SAR, as the charging power is lower than 3.1 kW and 55.5 kW, respectively. These results are positive with respect to the safe applications of parallel WPT systems working simultaneously.
Highlights
Wireless power transfer (WPT) technology using magnetic field coupling and offering wireless mid-range power transmission has been used for a variety of applications such as implantable biomedical devices, mobile electronics, household appliances, and electric vehicles [1,2,3,4]
The magnetic field field leakage from parallel wireless power transfer (WPT) systems working with phase difference is predicted by combining leakage from parallel WPT systems working with phase difference is predicted by combining the the circuit and three-dimensional (3D) finite element analysis (FEA) models
The induced electric field centralizes in the trunk, groin, and genitals with only one exception: for the human body standing right at the middle of the two WPT coils working in-phase, the induced electric field focuses on lower limbs
Summary
Wireless power transfer (WPT) technology using magnetic field coupling and offering wireless mid-range power transmission has been used for a variety of applications such as implantable biomedical devices, mobile electronics, household appliances, and electric vehicles [1,2,3,4]. There exists great possibilities with respect to power supply using multiple WPT systems working simultaneously and closely for household appliances and electric multiple WPT systems working simultaneously and closely for household appliances and electric vehicles in parking lots. The magnetic field leakage from the WPT systems is varied due to unpredictable asynchronous working conditions, which can induce an electric field in human bodies standing asynchronous working conditions, which can induce an electric field in human bodies standing around around the WPT systems and potentially pose adverse effects to health. The magnetic field field leakage from parallel WPT systems working with phase difference is predicted by combining leakage from parallel WPT systems working with phase difference is predicted by combining the the circuit and three-dimensional (3D) finite element analysis (FEA) models.
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