Overview of Different WPT Standards and a Simple Method to Measure EM Radiation of an Electric Vehicle Wireless Charger

Wireless power transmission (WPT) is becoming an inevitable technology of the 21st century. As the power is transmitted by electromagnetic induction through air medium, the chances of electromagnetic (EM) radiation will be high in the vicinity of the wireless charger. The effect of this radiation can be harmful to human, based on its strength and frequency. Various standards are implemented to fix the radiation limits in the bearable level. Since different standards follow different principles and fixing different limits, the lack of a common scale creates misconception to the manufactures and researchers. This paper discusses in detail about all the existing standards for the WPT applications and comparing it. As the available devices and technologies are relatively delicate and costly, a simplified EM radiation measurement mechanism is presented in the paper. A 100W electric vehicle charger is tested using the method.