How to optimize EMC for inverter IGBT drivers

Optimizing the EMC of the IGBT drive in a frequency converter requires ensuring a clean drive signal, strong anti-interference capability, and minimal noise generation from the drive behavior itself. Optimization measures include: selecting isolated drive chips or modules with high common-mode transient rejection (CMTI) to withstand high dv/dt on the power side; designing an independent, clean drive power supply, typically using an isolated DC-DC module with common-mode filtering on both the primary and secondary sides, such as using the CMZ1608 series common-mode inductor; adding a suitable gate resistor in series at the output stage of the drive chip to control the switching speed and balance EMI and switching losses; sometimes, a diode can be connected in parallel to achieve asymmetrical turn-off; connecting a small capacitor (1nF-10nF) in parallel between the IGBT gate and emitter can filter high-frequency noise and prevent false turn-on, but this increases switching losses; employing negative voltage turn-off technology to raise the anti-interference threshold; optimizing the drive board layout to minimize the drive loop area and ensure short, shielded drive signal lines; and adjusting parameters through gate waveform testing until the waveform is clean and overshoot is minimal. Eintech provides high-performance isolation driver ICs and matching filtering solutions to help engineers achieve EMC-optimized IGBT driver designs.