Conducted Interference Simulation for DC-DC Switching Power Supply

摘要

This paper introduces the principle of electromagnetic interference (EMI) for DC-DC Switching Power Supply (SPS), analyzes the coupling path of conducted interference. The SPICE model of key magnetic component transformer and inductance are built in software Magnetics Designer. Then we transfer the SPICE models into software Pspice for circuit simulation, which can detect the coupling path to reduce conducted interference. A filter circuit is improved based on the simulation. The comparison of simulation result and measurement data is helpful for the design of Switching Power Supply electromagnetic compatibility.