How can a PCS (Power Control System) pass an ESD (Electrostatic Discharge) test?

To pass ESD electrostatic discharge testing (such as IEC 61000-4-2), PCS needs to establish a low-impedance discharge path from the port to the chassis and then to ground, and protect the internal circuitry. Measures include:

1. Port protection: Install ESD protection devices at all accessible ports (such as buttons, communication interfaces, and metal casing seams). For example, use general-purpose ESD protection diodes such as ESD5V0D3 for buttons or low-speed I/O ports; use low-capacitance ESD devices, such as ESDLC or ESDULC series, for high-speed data lines (such as USB and HDMI).

2. Low-impedance grounding: The metal casing and shielding layer of the cabinet must be properly grounded to provide a direct discharge path for ESD current, preventing it from entering the internal circuitry.

3. Isolation and insulation: For non-metallic parts that cannot be directly grounded (such as circuitry behind plastic panels), ensure sufficient air gaps and creepage distances, or use insulating coatings.

4. Internal circuit robustness: Add RC filters or TVS diodes to the reset, interrupt, and other pins of sensitive chips.