Visualization of noise current distribution in an SiC power module using near-field magnetic scanning

Abstract

This report investigates noise current distribution in the switching operation of a silicon carbide (SiC) power module for optimization of the layout and packaging design. The noise current distribution is measured via the intensity of the near-field magnetic field, and the measurement methodology visualizes the noise current distribution on a wiring plane in the power module. The effect of a direct-current-link (DC-link) snubber capacitor on suppressing the voltage overshoot and ringing oscillation is evaluated using the proposed noise current identification method.