EMI Modeling And Analysis Of Ultra-high Frequency Induction Heating Power

With the development of power electronics technology, induction heating power supply has been steadily progressing and the increasement of the switching frequency and power density make ultra-high frequency induction heating power supply being widely used. However, the problem of electromagnetic interference is emerging, which will not only affect the normal operation of the power supply, but also cause pollution to the surrounding electromagnetic environment. Therefore, it is very significant to study and analyze the EMI modeling of ultra-high frequency induction heating power supply.This paper is based on the research of electromagnetic interference in the domestic and foreign, taking inverter as the research object to expound systematically and deeply about the modeling technique of EMI for ultra-high frequency induction heating power.Firstly, the ultra-high frequency induction heating power and electromagnetic interference are briefly introduced. Then the high frequency modeling method of key components in the circuit is studied in detail. The parasitic parameters of passive components are obtained by the method of resonance and experiment; High frequency modeling of power semiconductor devices are modeled by Architect Model in Saber;Q3D Ansoft software is used to extract the parasitic parameters of PCB. In the end, the high frequency simulation model and experimental platform of the ultra-high frequency induction heating power supply conducted EMI are constructed. Analysis of simulation results is verified that differential mode EMI is transmitted through the parasitic parameters of the circuit components and the parasitic inductance of PCB in the power line between phase and phase; And common mode EMI is transmitted through the parasitic capacitance of PCB in the power line between phase and ground. Comparison between simulation results and measured results, the spectrum of EMI is basically the same and the feasibility and validity of the EMI modeling method of the ultra-high frequency induction heating power supply is verified.