Research On Electromagnetic Radiation Safety In Wireless Power Transmission System Of The Human Implantable Electronic Devices

At present, implantable electronic devices are widely used for the medical industry has brought unprecedented progress in the diagnosis and treatment of disease. Previously, it is difficult to cure even incurable disease, because of the widely use of implantable electronic devices, problems be solved. In order to ensure the long-term implantable electronic devices, stable and efficient work, so use the wireless power transmission. When the system is working, it will produce a changing electromagnetic field. So that the electromagnetic field will cause some damage to the human body central nervous system, cardiovascular system, the auditory system etc. So that causes the body to produce a series of abnormal reaction, makes the body imbalance of, and even endanger human life, in order to ensure the body from harm. Therefore, human safety study under the implantable electronic devices capable of wireless power transmission system is very important. In this paper, we have studied the electromagnetic radiation safety of the wireless power transmission of implantable electronic devices. The main research work and innovations in this paper are summarized as follows:At first, we reviewed related literature, described the manifestation of electromagnetic radiation effects the human body, and summarized Research on the human body security in the electromagnetic environment domestic and foreign.Then, a professional electromagnetic simulation software HFSS implanted electronic devices and wireless power transmission system is designed simulation. Coil design uses a PCB coil charging system to meet the miniaturization requirements. The design and simulation of wireless power tranmission systems are well implanted in the media sphere model and a human head models, simulation experiments.Next study existing algorithms in Wireless Power Transmission System of implantable electronic devices in the human body when low-frequency electromagnetic environment and electromagnetic interactions, when the media mutate easily lead to failure of the algorithm can not get accurate data. Through numerous experiments, found a suitable low-frequency environment FDTD algorithm. Δx= Δy=Δz=2mm and Δx=Δy=Δz=4mm. Experimental results show that with the commercial software CST results in good agreement degree.Finally, this paper put the improved FDTD algorithm on three-dimensional model of the human head for electromagnetic in use, obtained the SAR the distribution of model the human head, the results show that the improved algorithm and CST software FDTD simulation results are very similar. And at the edge of the electromagnetic model of the human head, that Omm and 200mm can also get more accurate SAR values. To further verify the effectiveness of the algorithm, this paper performed the same experiment under different frequency. The results show that this kind of FDTD method and CST software match with satisfactory results, and at the edge of an electromagnetic model of the human head can get accurate results. And, SAR values within the model were lower than international safety limits, indicating that the wireless power transmission system is implanted electronic device power supply is safe.