How to reduce noise in the wiring of an electrical power measurement switch (PMS) switch driver?

In PMS (Power Management System), the drive lines of switches (such as MOSFETs and IGBTs) carry pulse currents with high dv/dt and di/dt values. Wiring noise can couple into the control circuit and even affect the switches themselves. Noise reduction wiring requires attention to minimizing drive loops, impedance matching, and shielding.

First, the driver IC should be placed as close as possible to the switch. The traces between the drive output and the switch gate should be short and thick (width > 0.5mm), and run parallel to the return path (source) to form a minimum loop. Connecting a small resistor (e.g., 10Ω) or a ferrite bead (PBZ1005B-501Z0T) in series on the drive line can dampen ringing.

Second, provide an independent, low-impedance ground path from the switch source to the driver IC ground, avoiding sharing with the digital ground. For high-voltage side drives, use an integrated bootstrap diode or a dedicated isolation driver chip (e.g., ADuM4223), and keep the wiring under the isolation boundary clean.

Additionally, a Zener diode (e.g., 12V) can be connected in parallel between the switch gate and source to prevent gate overvoltage. By carefully routing the circuit, the ringing voltage amplitude generated by the drive circuit can be reduced from 20V to less than 2V, the switching loss can be reduced by 15%, and false triggering can be avoided.