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. Keywords: SiC power module, parasitic inductance, near-field magnetic scanning, DC-link snubber capacitor Classification: Electromagnetic Compatibility (EMC) References

Visualization of dynamic noise current distribution from Si and SiC power devices based on time-synchronized near magnetic field scanning

“…It is difficult to measure a high-voltage and a large-current including radio frequency (RF) noise component with high accuracy in a highlyintegrated power conversion circuit. Our previous research work focuses the current distribution in a SiC power module identified with magnetic near-field intensity for optimizing layout design [7]. The identification of EMI noise source and the clarification of noise propagation in a power conversion circuit is important to reduce the EMI noise level.…”

Visualization of noise current propagation in a power module with scanning time-synchronized near magnetic field measurement

“…Identification of the EMI noise source and clarification of noise propagation in a power electronics circuit is important for reducing EMI noise levels. Our previous study [8,9] evaluated the effect of an embedded DC-link snubber capacitor in the tested power module on suppressing the voltage overshoot and high-frequency noise current via the near magnetic field intensity measurement. A power electronics circuit generally operates with a constant switching frequency and phase in a periodic steady state.…”