How to reduce noise in industrial servo drive circuit wiring?

The servo drive circuit (from the driver chip to the IGBT gate) wiring is a major area of noise coupling. Etymotic's noise reduction wiring rules are as follows: Use a "star" topology, with the driver chip output connected to each IGBT gate via an independent short wire to avoid a "daisy chain". Keep traces as short as possible (<5cm) and use differential routing (drive signals and return lines are tightly coupled and parallel). Place decoupling capacitors (e.g., a 10μF tantalum capacitor + a 100nF C0G) near the driver chip power pins and ground them through multiple vias.

To suppress gate ringing, install a series resistor (5-20Ω) close to the IGBT gate; if necessary, connect a Schottky diode (BAT54S) in parallel with the resistor. Maintain a complete ground plane under the entire drive circuit area and isolate it from other power grounds. Following these rules can control the parasitic inductance of the drive circuit to within 20nH and the gate voltage overshoot to <5V, thereby reducing false triggering and EMI emissions and improving switching reliability.