Ringing effect related to CGD15HB62LP and CAS325M12HM2

Battur

Hello.

We have a 2-level 3-phase inverter with CAS325M12HM2 SiC, CGD15HB62LP Gate Driver, and CGD12HB00D Differential transceiver. We had a commutation noise sensitivity issue before with the above-mentioned gate driver, which doesn't send pulses to its outputs sometimes without triggering its fault and resulted in a ringing effect at the inverter output. So, the Wolfspeed engineers suggested changing the CB22 capacitor of the gate driver from 100pF to 10000pF (Murata Electronics GCM2195C1H103JA16D). It works, and we don't have any missing pulses at the gate driver output. However, the inverter output starts oscillating, as shown in the figures (line-to-line voltage). We didn't have this oscillation issue before. So, we would like to ask for the part number of the original CB22 capacitor and any suggestions for solving this oscillation issue. Also, our positive and negative busbars are overlapped.

Thank you for your time and support,

Battur (batkhisb@mcmaster.ca)