Electromagnetic Environment Analysis Based On High Power Wireless Power Transfer

As a new energy transmission and distribution method,wireless power transmission technology has a very important application value in many fields,and the research of high power wireless power transmission technology via coupled magnetic resonances has further expanded the research field of this technology,including its application in the wireless charging of electric vehicles.With the development of science and technology,the impact of electromagnetic radiation on human security receives extensive attention of domestic and international attention more and more.And the effects of different frequencies and intensity electromagnetic radiation environment on human is different,slight damage is the skin fever and nerve pain,serious harm is insanity,heart failure,burns,and even death.Because of the shortcomings of the traditional charging methods of electric vehicles,the research for high power wireless power transmission applied to the charging of electric vehicles is more and more,therefore,the security study on the electromagnetic radiation environment of high power wireless power transmission becomes extremely important.For this,in this paper we make a more systematic study for the electromagnetic simulation methods and the principle of interaction between human body and electromagnetic environment of wireless power transmission system.The main points of this paper are as follows:1.In this paper,a two-coil coupled structure model based on the principle of magnetic coupling resonant wireless power transmission is used.The finite element principle of the field is analyzed,and the regional condition and the boundary condition formula of the structure are given,which provides the theoretical basis for the simulation analysis of the later.The model of shielded coil structure and non-shielded coil structure are constructed.The electromagnetic field distribution of the two models is compared and analyzed.The results show that the shielding material can reduce the radiation loss of the system.2.Based on the MRI images,the human body structure model including the main organs(heart,liver,stomach,lung and kidney)is constructed and the electromagnetic parameters are assigned to the human body structure model.By using the electromagnetic simulation software,the electromagnetic physical quantity distribution of the main organs in the human body is calculated and compared with the international hygienic standard.The results show that the human body is safe in this electromagnetic environment.3.The electromagnetic environment of the human body at different positions of the wireless power transmission system is simulated and analyzed,and the personal safety of the human body is evaluated under different conditions.Then the maximum temperature rise is obtained through the simulation analysis of the human body heat transfer model.At last,the electromagnetic environment of the wireless charging of electric vehicle is simulated and analyzed by establishing the simplified automobile model and the human sitting model.And the electromagnetic exposure of the main organs of the human body is studied.The calculated results show that all the electromagnetic physical quantities are lower than the limits set by the International Commission on Non-ionizing Radiation Protection.