Research On EMI Modeling And Simulation Of High Frequency Switching Mode Power Supply

The electromagnetic interference (EMI) modeling and simulation technology of high frequency switching mode power supply has been the effective method to analyze and forecast the EMI of the high frequency switching mode power supply in the early stage of product design. Based on the Boost converter with pulse width modulation control, this thesis does the research on conducted and radiated EMI modeling and simulation of the converter. The main research results are as follows:1. With the field-circuit method, the conducted EMI modeling and simulation of the Boost converter is studied. And the influence of skin effect and ground plane on high frequency characteristic of the printed circuit board (PCB) is emphatically discussed in a frequency range of10MHz through 30MHz.2. Based on the magnetic dipole radiated model, the radiated EMI model of high frequency current loop on PCB is established and it is simulated and analyzed with the result of the conducted EMI simulation.3. Based on the frequency model of the multiconductor transmission lines and the electric dipole radiated model, the radiated EMI model of the parallel double cables is established. And then the electromagnetic parameters of the parallel ribbon cables are calculated with the method of moment based on the the triangular basis function and the characteristic of their electromagnetic parameters is also investigated. Finally, the radiated EMI model is simulated and analyzed.