How to wire the inverter drive circuit to reduce noise?

Optimizing the wiring of the inverter drive circuit to reduce noise is crucial for preventing IGBT false triggering and improving reliability. Drive circuit noise primarily originates from power circuit coupling. Noise reduction wiring measures include: placing the drive chip as close as possible to the IGBT module and shortening the drive signal trace length. Drive signal lines (PWM output and fault feedback) should use twisted-pair or shielded cables, with the shield grounded at a single point on the drive board. On the PCB, drive signal lines should be kept away from power lines and DC buses; if parallel routing is necessary, sufficient spacing should be maintained, and they should be isolated with ground lines. The power decoupling capacitors for the drive chip must be placed close to their power pins and should use high-frequency MLCCs.

Add ferrite bead filtering to the drive power supply input lines, such as the PBZ1608 series. The drive circuit ground should be independent and clean, connected to the power ground via a ferrite bead or a single point. For optocoupler-isolated drives, the power and ground on the optocoupler secondary side (closer to the power side) require extra care to avoid contamination. Optimize the loop area of the drive circuit, especially the loop for the gate drive current. By measuring the gate voltage waveform, we can check for ringing or glitches and adjust the wiring or increase the gate resistance accordingly. Echotronics' isolation drive modules and filtering devices are designed with noise reduction wiring in mind, making them easy for engineers to integrate.