Simulation research on heating and electromagnetic radiation of electromagnetic induction wireless charging

At present, most of the research on the electromagnetic environment safety of wireless charging is limited to the magnetic resonance wireless charging of electric vehicles. However, the electromagnetic induction wireless charging device is closer to the human body and has a longer use time. This article focuses on the electromagnetic induction wireless charging conductor that easily induces foreign objects. The eddy current causes heat generation and human body electromagnetic radiation problems were simulated. The structure of the wireless charging system refers to the Qi standard. First, the influence of load resistance, coil spacing, and offset distance on the transmission efficiency and output power is simulated by the parameter circuit. Then, using the determined parameters, the temperature rise of the conductor foreign bodies of different materials within 30 minutes is studied. The simulation results show that when the conductor foreign bodies are facing the coil, the temperature rise is obvious, and the temperature of gold and silver and other materials can reach more than 100 °C. When the foreign body is not facing the coil, the temperature rise is within the acceptable range. Finally, use CST simulation to obtain the electromagnetic field intensity, human body temperature and CEM43 °C thermal has value to reflect the non-thermal and thermal effects of electromagnetic induction wireless charging on human electromagnetic radiation. The maximum electric field is 0.642 7 V/m and the maximum magnetic field is 2.694 0 A/m, the maximum temperature of the human brain is 37.3 °C, the thermal dose of CEM43 °C is 0.009 5, the result is basically within the normal reference value range. This research is conducive to the popularization and application of electromagnetic induction wireless charging devices.