How to reduce noise in the wiring of the PCS drive circuit of an energy storage system?

The routing quality of the IGBT/SiC drive circuit in a PCS directly affects the switching waveform and system EMC. The key to reducing noise is minimizing the parasitic inductance of the drive circuit and ensuring a clean reference ground. Routing guidelines:

1. Loop minimization: The loop area from the driver IC output to the gate and emitter of the switching transistor should be as small as possible. Twisted pairs or closely spaced parallel traces can be used.

2. Independent reference ground: Provide a separate, clean "drive ground" for the drive circuit. This ground should be directly and with low impedance connected to the emitter of the driven switching transistor (Kelvin connection), rather than returning through the power ground, to avoid power ground noise interfering with the drive.

3. Decoupling capacitors placed nearby: High-quality decoupling ceramic capacitors must be placed near the power pins of the driver IC.

4. Use gate resistors: Connect an appropriate resistor in series with the gate to suppress ringing. The resistor should be placed close to the gate.

5. Isolation and shielding: For high-voltage side drives, use isolated power and signal lines, and shield the drive lines or keep them away from power lines.