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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

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This study investigates noise current propagation in a power module accompanied with its switching operation. The noise current can be estimated from the measured near magnetic field. The proposed measurement system is developed to identify the time-dependent near magnetic field distribution in a power module. The system scans near magnetic field spatially and acquires its time-synchronized frequency spectrum. Propagation of the noise current in the power module is visualized as a time series of the noise current spectrum distribution in the power module. The developed system can help realize electromagnetic compatibility (EMC) design of a power module.

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