Abstract
Wireless power transfer for electric and plug-in hybrid vehicles has been developed to facilitate battery charging. In a wireless power transfer system, because the magnetic field leaks to the surroundings of the vehicle, it is important to evaluate the quantitative human exposure. The International Commission on Non-Ionizing Radiation Protection provides guidelines for human exposure assessment. In this study, we evaluate the magnetic field leakage under two parking configurations and current phase differences for two vehicles being simultaneously charged (3.7 kW at 85 kHz per vehicle). The results of the analysis show that the magnetic field leakage is lower than the reference level of the guidelines for all cases and that the leakage could be reduced by controlling the phase difference between the two wireless power transfer systems equally distributed from the single high-frequency power source for each parking configuration.
Highlights
To mitigate environmental problems such as global warming and air pollution, electric vehicles (EVs) and plug-in hybrid vehicles (PHVs), which have lower CO2 emissions compared to conventional gasoline vehicles, have been developed
In the guidelines [6] on human body protection against electromagnetic field exposure established by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), a physical quantity called basic restriction is defined as an evaluation standard for safety
The induced electric field is used as the physical quantity that defines the basic restriction for exposure to a magnetic field in the frequency band considered for use in Wireless power transfer (WPT) systems
Summary
To mitigate environmental problems such as global warming and air pollution, electric vehicles (EVs) and plug-in hybrid vehicles (PHVs), which have lower CO2 emissions compared to conventional gasoline vehicles, have been developed. Among the various methods for WPT [1,2,3,4,5], magnetic resonance coupling is most commonly used for EV and PHV charging due to its high transmission power and long-distance transmission. When a large amount of power is transmitted using this method, there is concern that exposure to the magnetic field leakage may affect the human body. In the guidelines [6] on human body protection against electromagnetic field exposure established by the International Commission on Non-Ionizing Radiation Protection (ICNIRP), a physical quantity called basic restriction is defined as an evaluation standard for safety. The induced electric field is used as the physical quantity that defines the basic restriction for exposure to a magnetic field in the frequency band considered for use in WPT systems. It was found that the induced electric field was below the basic restriction
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