SIMULATION OF PCB PARASITIC INFLUENCES IN POWER ELECTRONICS MODULES

摘要

This paper presents a step by step method of analyzing the influence of the parasitic elements of a Printed Circuit Board (PCB) on a high power push-pull DC-DC converter. For the right functionality of the push-pull bridge converter is essential to assure a perfect symmetry of the circuit. Also, because of higher power levels involved in the present case study the parasitics elements must be kept at lowest possible values. Our intention is to analyze and simulate the influences of the PCB layout on converter behavior. For the parasitic estimation of the PCB traces and copper zones we used the IE3D electromagnetic full wave planar simulator. Based on the lumped model of the passive interconnection structure a SPICE transient analysis was realized. The analysis results permit us to observe the voltage and current wave shapes at the switching elements and to estimate the functionality of the circuit. The method of analysis is not time effective but permits us a good prediction of the influences caused by the PCB parasitics on a real circuit behavior.